From 6113e3d28149dee33f10e92df6a16efb2b9cf473 Mon Sep 17 00:00:00 2001 From: Alex Ng Date: Sun, 30 Apr 2017 16:21:14 -0700 Subject: Tools: hv: vss: Thaw the filesystem and continue if freeze call has timed out If a FREEZE operation takes too long, the driver may time out and move on to another operation. The daemon is unaware of this and attempts to notify the driver that the FREEZE succeeded. This results in an error from the driver and the daemon leaves the filesystem in frozen state. Fix this by thawing the filesystem and continuing. Signed-off-by: Michael Gissing Signed-off-by: Alex Ng Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- tools/hv/hv_vss_daemon.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c index e0829809c897..7ba54195934c 100644 --- a/tools/hv/hv_vss_daemon.c +++ b/tools/hv/hv_vss_daemon.c @@ -261,7 +261,9 @@ int main(int argc, char *argv[]) if (len != sizeof(struct hv_vss_msg)) { syslog(LOG_ERR, "write failed; error: %d %s", errno, strerror(errno)); - exit(EXIT_FAILURE); + + if (op == VSS_OP_FREEZE) + vss_operate(VSS_OP_THAW); } } -- cgit v1.2.3 From a1a7ea6bd6d55b6620c9c0a43bf684d6c427172a Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Sun, 30 Apr 2017 16:21:15 -0700 Subject: tools: hv: properly handle long paths Paths can be up to PATH_MAX long and PATH_MAX is usually greater than 256. While on it, simplify path reconstruction to a simple snprintf(), define and reuse KVP_NET_DIR. Suggested-by: Tomas Hozza Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- tools/hv/hv_kvp_daemon.c | 44 ++++++++++++++++++-------------------------- 1 file changed, 18 insertions(+), 26 deletions(-) diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c index f1758fcbc37d..88b20e007c05 100644 --- a/tools/hv/hv_kvp_daemon.c +++ b/tools/hv/hv_kvp_daemon.c @@ -39,6 +39,7 @@ #include #include #include +#include #include /* @@ -97,6 +98,8 @@ static struct utsname uts_buf; #define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/" #endif +#define KVP_NET_DIR "/sys/class/net/" + #define MAX_FILE_NAME 100 #define ENTRIES_PER_BLOCK 50 @@ -596,26 +599,21 @@ static char *kvp_get_if_name(char *guid) DIR *dir; struct dirent *entry; FILE *file; - char *p, *q, *x; + char *p, *x; char *if_name = NULL; char buf[256]; - char *kvp_net_dir = "/sys/class/net/"; - char dev_id[256]; + char dev_id[PATH_MAX]; - dir = opendir(kvp_net_dir); + dir = opendir(KVP_NET_DIR); if (dir == NULL) return NULL; - snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir); - q = dev_id + strlen(kvp_net_dir); - while ((entry = readdir(dir)) != NULL) { /* * Set the state for the next pass. */ - *q = '\0'; - strcat(dev_id, entry->d_name); - strcat(dev_id, "/device/device_id"); + snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id", + KVP_NET_DIR, entry->d_name); file = fopen(dev_id, "r"); if (file == NULL) @@ -653,12 +651,12 @@ static char *kvp_if_name_to_mac(char *if_name) FILE *file; char *p, *x; char buf[256]; - char addr_file[256]; + char addr_file[PATH_MAX]; unsigned int i; char *mac_addr = NULL; - snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/", - if_name, "/address"); + snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR, + if_name, "/address"); file = fopen(addr_file, "r"); if (file == NULL) @@ -688,28 +686,22 @@ static char *kvp_mac_to_if_name(char *mac) DIR *dir; struct dirent *entry; FILE *file; - char *p, *q, *x; + char *p, *x; char *if_name = NULL; char buf[256]; - char *kvp_net_dir = "/sys/class/net/"; - char dev_id[256]; + char dev_id[PATH_MAX]; unsigned int i; - dir = opendir(kvp_net_dir); + dir = opendir(KVP_NET_DIR); if (dir == NULL) return NULL; - snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir); - q = dev_id + strlen(kvp_net_dir); - while ((entry = readdir(dir)) != NULL) { /* * Set the state for the next pass. */ - *q = '\0'; - - strcat(dev_id, entry->d_name); - strcat(dev_id, "/address"); + snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR, + entry->d_name); file = fopen(dev_id, "r"); if (file == NULL) @@ -1218,9 +1210,9 @@ static int process_ip_string(FILE *f, char *ip_string, int type) static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val) { int error = 0; - char if_file[128]; + char if_file[PATH_MAX]; FILE *file; - char cmd[512]; + char cmd[PATH_MAX]; char *mac_addr; /* -- cgit v1.2.3 From 48f4ccdfc46906627f77fda94d80f2db1bd23ba3 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Sun, 30 Apr 2017 16:21:16 -0700 Subject: Drivers: hv: vmbus: Fix error code returned by vmbus_post_msg() ENOBUFS is a more approrpiate error code to be returned when the hypervisor cannot post the message because of insufficient buffers. Make the adjustment. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/connection.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index fce27fb141cc..a938fcfe9bc9 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -370,7 +370,7 @@ int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep) break; case HV_STATUS_INSUFFICIENT_MEMORY: case HV_STATUS_INSUFFICIENT_BUFFERS: - ret = -ENOMEM; + ret = -ENOBUFS; break; case HV_STATUS_SUCCESS: return ret; -- cgit v1.2.3 From 1e052a16eb2caf6727b594cad0744ccdfddf4254 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Sun, 30 Apr 2017 16:21:17 -0700 Subject: Drivers: hv: util: Make hv_poll_channel() a little more efficient The current code unconditionally sends an IPI. If we are running on the correct CPU and are in interrupt level, we don't need an IPI. Make this adjustment. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hyperv_vmbus.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 6113e915c50e..fa514be7679c 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -411,6 +411,10 @@ static inline void hv_poll_channel(struct vmbus_channel *channel, if (!channel) return; + if (in_interrupt() && (channel->target_cpu == smp_processor_id())) { + cb(channel); + return; + } smp_call_function_single(channel->target_cpu, cb, channel, true); } -- cgit v1.2.3 From 54a66265d6754b37fb4baf1d970ec88a6225a988 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Sun, 30 Apr 2017 16:21:18 -0700 Subject: Drivers: hv: vmbus: Fix rescind handling Fix the rescind handling. This patch addresses the following rescind scenario that is currently not handled correctly: If a rescind were to be received while the offer is still being peocessed, we will be blocked indefinitely since the rescind message is handled on the same work element as the offer message. Fix this issue. I would like to thank Dexuan Cui and Long Li for working with me on this patch. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/channel.c | 8 ++++-- drivers/hv/channel_mgmt.c | 69 ++++++++++++++++++++++++++++++++++++----------- drivers/hv/connection.c | 7 +++-- drivers/hv/hyperv_vmbus.h | 7 +++++ drivers/hv/vmbus_drv.c | 29 +++++++++++++++++++- 5 files changed, 99 insertions(+), 21 deletions(-) diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 736ac76d2a6a..e9bf0bb87ac4 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -630,9 +630,13 @@ void vmbus_close(struct vmbus_channel *channel) */ list_for_each_safe(cur, tmp, &channel->sc_list) { cur_channel = list_entry(cur, struct vmbus_channel, sc_list); - if (cur_channel->state != CHANNEL_OPENED_STATE) - continue; vmbus_close_internal(cur_channel); + if (cur_channel->rescind) { + mutex_lock(&vmbus_connection.channel_mutex); + hv_process_channel_removal(cur_channel, + cur_channel->offermsg.child_relid); + mutex_unlock(&vmbus_connection.channel_mutex); + } } /* * Now close the primary. diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 735f9363f2e4..0fabd410efd9 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -428,7 +428,6 @@ void vmbus_free_channels(void) { struct vmbus_channel *channel, *tmp; - mutex_lock(&vmbus_connection.channel_mutex); list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, listentry) { /* hv_process_channel_removal() needs this */ @@ -436,7 +435,6 @@ void vmbus_free_channels(void) vmbus_device_unregister(channel->device_obj); } - mutex_unlock(&vmbus_connection.channel_mutex); } /* @@ -483,8 +481,10 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) list_add_tail(&newchannel->sc_list, &channel->sc_list); channel->num_sc++; spin_unlock_irqrestore(&channel->lock, flags); - } else + } else { + atomic_dec(&vmbus_connection.offer_in_progress); goto err_free_chan; + } } dev_type = hv_get_dev_type(newchannel); @@ -511,6 +511,7 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) if (!fnew) { if (channel->sc_creation_callback != NULL) channel->sc_creation_callback(newchannel); + atomic_dec(&vmbus_connection.offer_in_progress); return; } @@ -532,9 +533,7 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) * binding which eventually invokes the device driver's AddDevice() * method. */ - mutex_lock(&vmbus_connection.channel_mutex); ret = vmbus_device_register(newchannel->device_obj); - mutex_unlock(&vmbus_connection.channel_mutex); if (ret != 0) { pr_err("unable to add child device object (relid %d)\n", @@ -542,6 +541,8 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) kfree(newchannel->device_obj); goto err_deq_chan; } + + atomic_dec(&vmbus_connection.offer_in_progress); return; err_deq_chan: @@ -797,6 +798,7 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) newchannel = alloc_channel(); if (!newchannel) { vmbus_release_relid(offer->child_relid); + atomic_dec(&vmbus_connection.offer_in_progress); pr_err("Unable to allocate channel object\n"); return; } @@ -843,16 +845,38 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) rescind = (struct vmbus_channel_rescind_offer *)hdr; + /* + * The offer msg and the corresponding rescind msg + * from the host are guranteed to be ordered - + * offer comes in first and then the rescind. + * Since we process these events in work elements, + * and with preemption, we may end up processing + * the events out of order. Given that we handle these + * work elements on the same CPU, this is possible only + * in the case of preemption. In any case wait here + * until the offer processing has moved beyond the + * point where the channel is discoverable. + */ + + while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { + /* + * We wait here until any channel offer is currently + * being processed. + */ + msleep(1); + } + mutex_lock(&vmbus_connection.channel_mutex); channel = relid2channel(rescind->child_relid); + mutex_unlock(&vmbus_connection.channel_mutex); if (channel == NULL) { /* - * This is very impossible, because in - * vmbus_process_offer(), we have already invoked - * vmbus_release_relid() on error. + * We failed in processing the offer message; + * we would have cleaned up the relid in that + * failure path. */ - goto out; + return; } spin_lock_irqsave(&channel->lock, flags); @@ -864,7 +888,7 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) if (channel->device_obj) { if (channel->chn_rescind_callback) { channel->chn_rescind_callback(channel); - goto out; + return; } /* * We will have to unregister this device from the @@ -875,13 +899,26 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) vmbus_device_unregister(channel->device_obj); put_device(dev); } - } else { - hv_process_channel_removal(channel, - channel->offermsg.child_relid); } - -out: - mutex_unlock(&vmbus_connection.channel_mutex); + if (channel->primary_channel != NULL) { + /* + * Sub-channel is being rescinded. Following is the channel + * close sequence when initiated from the driveri (refer to + * vmbus_close() for details): + * 1. Close all sub-channels first + * 2. Then close the primary channel. + */ + if (channel->state == CHANNEL_OPEN_STATE) { + /* + * The channel is currently not open; + * it is safe for us to cleanup the channel. + */ + mutex_lock(&vmbus_connection.channel_mutex); + hv_process_channel_removal(channel, + channel->offermsg.child_relid); + mutex_unlock(&vmbus_connection.channel_mutex); + } + } } void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index a938fcfe9bc9..c2d74ee95f60 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -93,10 +93,13 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, * all the CPUs. This is needed for kexec to work correctly where * the CPU attempting to connect may not be CPU 0. */ - if (version >= VERSION_WIN8_1) + if (version >= VERSION_WIN8_1) { msg->target_vcpu = hv_context.vp_index[smp_processor_id()]; - else + vmbus_connection.connect_cpu = smp_processor_id(); + } else { msg->target_vcpu = 0; + vmbus_connection.connect_cpu = 0; + } /* * Add to list before we send the request since we may diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index fa514be7679c..1b6a5e0dfa75 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -303,6 +303,13 @@ enum vmbus_connect_state { #define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT struct vmbus_connection { + /* + * CPU on which the initial host contact was made. + */ + int connect_cpu; + + atomic_t offer_in_progress; + enum vmbus_connect_state conn_state; atomic_t next_gpadl_handle; diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 0087b49095eb..59bb3efa6e10 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -798,8 +798,10 @@ static void vmbus_device_release(struct device *device) struct hv_device *hv_dev = device_to_hv_device(device); struct vmbus_channel *channel = hv_dev->channel; + mutex_lock(&vmbus_connection.channel_mutex); hv_process_channel_removal(channel, channel->offermsg.child_relid); + mutex_unlock(&vmbus_connection.channel_mutex); kfree(hv_dev); } @@ -877,7 +879,32 @@ void vmbus_on_msg_dpc(unsigned long data) INIT_WORK(&ctx->work, vmbus_onmessage_work); memcpy(&ctx->msg, msg, sizeof(*msg)); - queue_work(vmbus_connection.work_queue, &ctx->work); + /* + * The host can generate a rescind message while we + * may still be handling the original offer. We deal with + * this condition by ensuring the processing is done on the + * same CPU. + */ + switch (hdr->msgtype) { + case CHANNELMSG_RESCIND_CHANNELOFFER: + /* + * If we are handling the rescind message; + * schedule the work on the global work queue. + */ + schedule_work_on(vmbus_connection.connect_cpu, + &ctx->work); + break; + + case CHANNELMSG_OFFERCHANNEL: + atomic_inc(&vmbus_connection.offer_in_progress); + queue_work_on(vmbus_connection.connect_cpu, + vmbus_connection.work_queue, + &ctx->work); + break; + + default: + queue_work(vmbus_connection.work_queue, &ctx->work); + } } else entry->message_handler(hdr); -- cgit v1.2.3 From a3ade8cc474d848676278660e65f5af1e9e094d9 Mon Sep 17 00:00:00 2001 From: Long Li Date: Sun, 30 Apr 2017 16:21:19 -0700 Subject: HV: properly delay KVP packets when negotiation is in progress The host may send multiple negotiation packets (due to timeout) before the KVP user-mode daemon is connected. KVP user-mode daemon is connected. We need to defer processing those packets until the daemon is negotiated and connected. It's okay for guest to respond to all negotiation packets. In addition, the host may send multiple staged KVP requests as soon as negotiation is done. We need to properly process those packets using one tasklet for exclusive access to ring buffer. This patch is based on the work of Nick Meier . Signed-off-by: Long Li Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv_kvp.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c index e99ff2ddad40..9a90b915b5be 100644 --- a/drivers/hv/hv_kvp.c +++ b/drivers/hv/hv_kvp.c @@ -112,7 +112,7 @@ static void kvp_poll_wrapper(void *channel) { /* Transaction is finished, reset the state here to avoid races. */ kvp_transaction.state = HVUTIL_READY; - hv_kvp_onchannelcallback(channel); + tasklet_schedule(&((struct vmbus_channel *)channel)->callback_event); } static void kvp_register_done(void) @@ -159,7 +159,7 @@ static void kvp_timeout_func(struct work_struct *dummy) static void kvp_host_handshake_func(struct work_struct *dummy) { - hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback); + tasklet_schedule(&kvp_transaction.recv_channel->callback_event); } static int kvp_handle_handshake(struct hv_kvp_msg *msg) @@ -625,16 +625,17 @@ void hv_kvp_onchannelcallback(void *context) NEGO_IN_PROGRESS, NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED; - if (host_negotiatied == NEGO_NOT_STARTED && - kvp_transaction.state < HVUTIL_READY) { + if (kvp_transaction.state < HVUTIL_READY) { /* * If userspace daemon is not connected and host is asking * us to negotiate we need to delay to not lose messages. * This is important for Failover IP setting. */ - host_negotiatied = NEGO_IN_PROGRESS; - schedule_delayed_work(&kvp_host_handshake_work, + if (host_negotiatied == NEGO_NOT_STARTED) { + host_negotiatied = NEGO_IN_PROGRESS; + schedule_delayed_work(&kvp_host_handshake_work, HV_UTIL_NEGO_TIMEOUT * HZ); + } return; } if (kvp_transaction.state > HVUTIL_READY) @@ -702,6 +703,7 @@ void hv_kvp_onchannelcallback(void *context) VM_PKT_DATA_INBAND, 0); host_negotiatied = NEGO_FINISHED; + hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper); } } -- cgit v1.2.3 From df2aa81a44a904c34473f0974d67c5b257163e86 Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Mon, 15 May 2017 11:08:09 +0200 Subject: ipack: Delete an error message for a failed memory allocation in ipack_device_read_id() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Omit an extra message for a memory allocation failure in this function. This issue was detected by using the Coccinelle software. Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdf Signed-off-by: Markus Elfring Acked-by: Samuel Iglesias Gonsálvez Signed-off-by: Greg Kroah-Hartman --- drivers/ipack/ipack.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/ipack/ipack.c b/drivers/ipack/ipack.c index 12102448fddd..575c4f29e0f7 100644 --- a/drivers/ipack/ipack.c +++ b/drivers/ipack/ipack.c @@ -402,7 +402,6 @@ static int ipack_device_read_id(struct ipack_device *dev) * ID ROM contents */ dev->id = kmalloc(dev->id_avail, GFP_KERNEL); if (!dev->id) { - dev_err(&dev->dev, "dev->id alloc failed.\n"); ret = -ENOMEM; goto out; } -- cgit v1.2.3 From ff35eb23de9be50fbe3405f35244b5e82eadc5fa Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Mon, 15 May 2017 11:08:10 +0200 Subject: ipack: Improve a size determination in ipack_bus_register() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Replace the specification of a data structure by a pointer dereference as the parameter for the operator "sizeof" to make the corresponding size determination a bit safer according to the Linux coding style convention. Signed-off-by: Markus Elfring Acked-by: Samuel Iglesias Gonsálvez Signed-off-by: Greg Kroah-Hartman --- drivers/ipack/ipack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ipack/ipack.c b/drivers/ipack/ipack.c index 575c4f29e0f7..a1e07a77d4e6 100644 --- a/drivers/ipack/ipack.c +++ b/drivers/ipack/ipack.c @@ -212,7 +212,7 @@ struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots, int bus_nr; struct ipack_bus_device *bus; - bus = kzalloc(sizeof(struct ipack_bus_device), GFP_KERNEL); + bus = kzalloc(sizeof(*bus), GFP_KERNEL); if (!bus) return NULL; -- cgit v1.2.3 From f4660cc994e12bae60d6f49895636fba662ce0a1 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Wed, 10 May 2017 10:19:18 -0400 Subject: vhost/vsock: use static minor number Vhost-vsock is a software device so there is no probe call that causes the driver to register its misc char device node. This creates a chicken and egg problem: userspace applications must open /dev/vhost-vsock to use the driver but the file doesn't exist until the kernel module has been loaded. Use the devname modalias mechanism so that /dev/vhost-vsock is created at boot. The vhost_vsock kernel module is automatically loaded when the first application opens /dev/host-vsock. Note that the "reserved for local use" range in Documentation/admin-guide/devices.txt is incorrect. The userio driver already occupies part of that range. I've updated the documentation accordingly. Cc: device@lanana.org Signed-off-by: Stefan Hajnoczi Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/devices.txt | 4 +++- drivers/vhost/vsock.c | 4 +++- include/linux/miscdevice.h | 1 + 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt index c9cea2e39c21..6b71852dadc2 100644 --- a/Documentation/admin-guide/devices.txt +++ b/Documentation/admin-guide/devices.txt @@ -369,8 +369,10 @@ 237 = /dev/loop-control Loopback control device 238 = /dev/vhost-net Host kernel accelerator for virtio net 239 = /dev/uhid User-space I/O driver support for HID subsystem + 240 = /dev/userio Serio driver testing device + 241 = /dev/vhost-vsock Host kernel driver for virtio vsock - 240-254 Reserved for local use + 242-254 Reserved for local use 255 Reserved for MISC_DYNAMIC_MINOR 11 char Raw keyboard device (Linux/SPARC only) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 3acef3c5d8ed..3f63e03de8e8 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -706,7 +706,7 @@ static const struct file_operations vhost_vsock_fops = { }; static struct miscdevice vhost_vsock_misc = { - .minor = MISC_DYNAMIC_MINOR, + .minor = VHOST_VSOCK_MINOR, .name = "vhost-vsock", .fops = &vhost_vsock_fops, }; @@ -778,3 +778,5 @@ module_exit(vhost_vsock_exit); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Asias He"); MODULE_DESCRIPTION("vhost transport for vsock "); +MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR); +MODULE_ALIAS("devname:vhost-vsock"); diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h index 762b5fec3383..58751eae5f77 100644 --- a/include/linux/miscdevice.h +++ b/include/linux/miscdevice.h @@ -54,6 +54,7 @@ #define VHOST_NET_MINOR 238 #define UHID_MINOR 239 #define USERIO_MINOR 240 +#define VHOST_VSOCK_MINOR 241 #define MISC_DYNAMIC_MINOR 255 struct device; -- cgit v1.2.3 From 98e959d44bcaac70c3056578122b5ce777ff42f0 Mon Sep 17 00:00:00 2001 From: Vincent Legoll Date: Tue, 11 Apr 2017 16:26:41 +0200 Subject: drivers: pps: Make PPS into a menuconfig to ease disabling So that there's no need to get into the submenu to disable all related config entries. The BROKEN PPS_GENERATOR_PARPORT now also depends on PPS Signed-off-by: Vincent Legoll Acked-by: Rodolfo Giometti Signed-off-by: Greg Kroah-Hartman --- drivers/pps/Kconfig | 12 +++--------- drivers/pps/clients/Kconfig | 6 ++---- drivers/pps/generators/Kconfig | 3 ++- 3 files changed, 7 insertions(+), 14 deletions(-) diff --git a/drivers/pps/Kconfig b/drivers/pps/Kconfig index 564a51abeece..4b29a7182d7b 100644 --- a/drivers/pps/Kconfig +++ b/drivers/pps/Kconfig @@ -2,9 +2,7 @@ # PPS support configuration # -menu "PPS support" - -config PPS +menuconfig PPS tristate "PPS support" ---help--- PPS (Pulse Per Second) is a special pulse provided by some GPS @@ -20,10 +18,10 @@ config PPS To compile this driver as a module, choose M here: the module will be called pps_core.ko. -if PPS config PPS_DEBUG bool "PPS debugging messages" + depends on PPS help Say Y here if you want the PPS support to produce a bunch of debug messages to the system log. Select this if you are having a @@ -31,17 +29,13 @@ config PPS_DEBUG config NTP_PPS bool "PPS kernel consumer support" - depends on !NO_HZ_COMMON + depends on PPS && !NO_HZ_COMMON help This option adds support for direct in-kernel time synchronization using an external PPS signal. It doesn't work on tickless systems at the moment. -endif - source drivers/pps/clients/Kconfig source drivers/pps/generators/Kconfig - -endmenu diff --git a/drivers/pps/clients/Kconfig b/drivers/pps/clients/Kconfig index 0c9f2805d076..efec021ce662 100644 --- a/drivers/pps/clients/Kconfig +++ b/drivers/pps/clients/Kconfig @@ -2,12 +2,12 @@ # PPS clients configuration # -if PPS - comment "PPS clients support" + depends on PPS config PPS_CLIENT_KTIMER tristate "Kernel timer client (Testing client, use for debug)" + depends on PPS help If you say yes here you get support for a PPS debugging client which uses a kernel timer to generate the PPS signal. @@ -37,5 +37,3 @@ config PPS_CLIENT_GPIO GPIO. To be useful you must also register a platform device specifying the GPIO pin and other options, usually in your board setup. - -endif diff --git a/drivers/pps/generators/Kconfig b/drivers/pps/generators/Kconfig index e4c4f3dc0728..86b59378e71f 100644 --- a/drivers/pps/generators/Kconfig +++ b/drivers/pps/generators/Kconfig @@ -3,10 +3,11 @@ # comment "PPS generators support" + depends on PPS config PPS_GENERATOR_PARPORT tristate "Parallel port PPS signal generator" - depends on PARPORT && BROKEN + depends on PPS && PARPORT && BROKEN help If you say yes here you get support for a PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses -- cgit v1.2.3 From acec09e67dc450d09a912735855326c3f1146a37 Mon Sep 17 00:00:00 2001 From: Jim Harris Date: Tue, 2 May 2017 07:20:59 -0700 Subject: uio/uio_pci_generic: don't fail probe if pdev->irq == NULL Some userspace drivers and frameworks only poll and do not require interrupts to be available and enabled on the PCI device. So remove the requirement that an IRQ is assigned. If an IRQ is not assigned and a userspace driver tries to read()/write(), the generic uio framework will just return -EIO. This allows binding uio_pci_generic to devices which cannot get an IRQ assigned, such as an NVMe controller behind Intel Volume Management Device (VMD), since VMD does not support INTx interrupts. Signed-off-by: Jim Harris Acked-by: Michael S. Tsirkin Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio_pci_generic.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c index d0b508b68f3c..a56fdf972dbe 100644 --- a/drivers/uio/uio_pci_generic.c +++ b/drivers/uio/uio_pci_generic.c @@ -66,14 +66,7 @@ static int probe(struct pci_dev *pdev, return err; } - if (!pdev->irq) { - dev_warn(&pdev->dev, "No IRQ assigned to device: " - "no support for interrupts?\n"); - pci_disable_device(pdev); - return -ENODEV; - } - - if (!pci_intx_mask_supported(pdev)) { + if (pdev->irq && !pci_intx_mask_supported(pdev)) { err = -ENODEV; goto err_verify; } @@ -86,10 +79,15 @@ static int probe(struct pci_dev *pdev, gdev->info.name = "uio_pci_generic"; gdev->info.version = DRIVER_VERSION; - gdev->info.irq = pdev->irq; - gdev->info.irq_flags = IRQF_SHARED; - gdev->info.handler = irqhandler; gdev->pdev = pdev; + if (pdev->irq) { + gdev->info.irq = pdev->irq; + gdev->info.irq_flags = IRQF_SHARED; + gdev->info.handler = irqhandler; + } else { + dev_warn(&pdev->dev, "No IRQ assigned to device: " + "no support for interrupts?\n"); + } err = uio_register_device(&pdev->dev, &gdev->info); if (err) -- cgit v1.2.3 From 7918cfc46cfad784b2aafdbbc690a96af0ae78d0 Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Tue, 2 May 2017 15:16:29 -0700 Subject: firmware: google: memconsole: Make memconsole interface more flexible This patch redesigns the interface between the generic memconsole driver and its implementations to become more flexible than a flat memory buffer with unchanging bounds. This allows memconsoles like coreboot's to include lines that were added by runtime firmware after the driver was initialized. Since the console log size is thus no longer static, this means that the /sys/firmware/log file has to become unseekable. Signed-off-by: Julius Werner Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/memconsole-coreboot.c | 12 +++++++++--- drivers/firmware/google/memconsole-x86-legacy.c | 18 +++++++++++++++--- drivers/firmware/google/memconsole.c | 14 ++++++-------- drivers/firmware/google/memconsole.h | 7 ++++--- 4 files changed, 34 insertions(+), 17 deletions(-) diff --git a/drivers/firmware/google/memconsole-coreboot.c b/drivers/firmware/google/memconsole-coreboot.c index 02711114dece..d48a80c3042d 100644 --- a/drivers/firmware/google/memconsole-coreboot.c +++ b/drivers/firmware/google/memconsole-coreboot.c @@ -33,6 +33,14 @@ struct cbmem_cons { static struct cbmem_cons __iomem *cbmem_console; +static ssize_t memconsole_coreboot_read(char *buf, loff_t pos, size_t count) +{ + return memory_read_from_buffer(buf, count, &pos, + cbmem_console->buffer_body, + min(cbmem_console->buffer_cursor, + cbmem_console->buffer_size)); +} + static int memconsole_coreboot_init(phys_addr_t physaddr) { struct cbmem_cons __iomem *tmp_cbmc; @@ -50,9 +58,7 @@ static int memconsole_coreboot_init(phys_addr_t physaddr) if (!cbmem_console) return -ENOMEM; - memconsole_setup(cbmem_console->buffer_body, - min(cbmem_console->buffer_cursor, cbmem_console->buffer_size)); - + memconsole_setup(memconsole_coreboot_read); return 0; } diff --git a/drivers/firmware/google/memconsole-x86-legacy.c b/drivers/firmware/google/memconsole-x86-legacy.c index 1f279ee883b9..8c1bf6dbdaa6 100644 --- a/drivers/firmware/google/memconsole-x86-legacy.c +++ b/drivers/firmware/google/memconsole-x86-legacy.c @@ -48,6 +48,15 @@ struct biosmemcon_ebda { }; } __packed; +static char *memconsole_baseaddr; +static size_t memconsole_length; + +static ssize_t memconsole_read(char *buf, loff_t pos, size_t count) +{ + return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr, + memconsole_length); +} + static void found_v1_header(struct biosmemcon_ebda *hdr) { pr_info("memconsole: BIOS console v1 EBDA structure found at %p\n", @@ -56,7 +65,9 @@ static void found_v1_header(struct biosmemcon_ebda *hdr) hdr->v1.buffer_addr, hdr->v1.start, hdr->v1.end, hdr->v1.num_chars); - memconsole_setup(phys_to_virt(hdr->v1.buffer_addr), hdr->v1.num_chars); + memconsole_baseaddr = phys_to_virt(hdr->v1.buffer_addr); + memconsole_length = hdr->v1.num_chars; + memconsole_setup(memconsole_read); } static void found_v2_header(struct biosmemcon_ebda *hdr) @@ -67,8 +78,9 @@ static void found_v2_header(struct biosmemcon_ebda *hdr) hdr->v2.buffer_addr, hdr->v2.start, hdr->v2.end, hdr->v2.num_bytes); - memconsole_setup(phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start), - hdr->v2.end - hdr->v2.start); + memconsole_baseaddr = phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start); + memconsole_length = hdr->v2.end - hdr->v2.start; + memconsole_setup(memconsole_read); } /* diff --git a/drivers/firmware/google/memconsole.c b/drivers/firmware/google/memconsole.c index 94e200ddb4fa..166f07c68c02 100644 --- a/drivers/firmware/google/memconsole.c +++ b/drivers/firmware/google/memconsole.c @@ -22,15 +22,15 @@ #include "memconsole.h" -static char *memconsole_baseaddr; -static size_t memconsole_length; +static ssize_t (*memconsole_read_func)(char *, loff_t, size_t); static ssize_t memconsole_read(struct file *filp, struct kobject *kobp, struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { - return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr, - memconsole_length); + if (WARN_ON_ONCE(!memconsole_read_func)) + return -EIO; + return memconsole_read_func(buf, pos, count); } static struct bin_attribute memconsole_bin_attr = { @@ -38,16 +38,14 @@ static struct bin_attribute memconsole_bin_attr = { .read = memconsole_read, }; -void memconsole_setup(void *baseaddr, size_t length) +void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t)) { - memconsole_baseaddr = baseaddr; - memconsole_length = length; + memconsole_read_func = read_func; } EXPORT_SYMBOL(memconsole_setup); int memconsole_sysfs_init(void) { - memconsole_bin_attr.size = memconsole_length; return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr); } EXPORT_SYMBOL(memconsole_sysfs_init); diff --git a/drivers/firmware/google/memconsole.h b/drivers/firmware/google/memconsole.h index 190fc03a51ae..ff1592dc7d1a 100644 --- a/drivers/firmware/google/memconsole.h +++ b/drivers/firmware/google/memconsole.h @@ -18,13 +18,14 @@ #ifndef __FIRMWARE_GOOGLE_MEMCONSOLE_H #define __FIRMWARE_GOOGLE_MEMCONSOLE_H +#include + /* * memconsole_setup * - * Initialize the memory console from raw (virtual) base - * address and length. + * Initialize the memory console, passing the function to handle read accesses. */ -void memconsole_setup(void *baseaddr, size_t length); +void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t)); /* * memconsole_sysfs_init -- cgit v1.2.3 From a5061d028594a31dbf70f4554e0b7d83e5ce770f Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Tue, 2 May 2017 15:16:30 -0700 Subject: firmware: google: memconsole: Adapt to new coreboot ring buffer format The upstream coreboot implementation of memconsole was enhanced from a single-boot console to a persistent ring buffer (https://review.coreboot.org/#/c/18301). This patch changes the kernel memconsole driver to be able to read the new format in all cases. Signed-off-by: Julius Werner Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/memconsole-coreboot.c | 47 ++++++++++++++++++++++----- 1 file changed, 39 insertions(+), 8 deletions(-) diff --git a/drivers/firmware/google/memconsole-coreboot.c b/drivers/firmware/google/memconsole-coreboot.c index d48a80c3042d..7d39f4ef5d9e 100644 --- a/drivers/firmware/google/memconsole-coreboot.c +++ b/drivers/firmware/google/memconsole-coreboot.c @@ -26,19 +26,50 @@ /* CBMEM firmware console log descriptor. */ struct cbmem_cons { - u32 buffer_size; - u32 buffer_cursor; - u8 buffer_body[0]; + u32 size; + u32 cursor; + u8 body[0]; } __packed; +#define CURSOR_MASK ((1 << 28) - 1) +#define OVERFLOW (1 << 31) + static struct cbmem_cons __iomem *cbmem_console; +/* + * The cbmem_console structure is read again on every access because it may + * change at any time if runtime firmware logs new messages. This may rarely + * lead to race conditions where the firmware overwrites the beginning of the + * ring buffer with more lines after we have already read |cursor|. It should be + * rare and harmless enough that we don't spend extra effort working around it. + */ static ssize_t memconsole_coreboot_read(char *buf, loff_t pos, size_t count) { - return memory_read_from_buffer(buf, count, &pos, - cbmem_console->buffer_body, - min(cbmem_console->buffer_cursor, - cbmem_console->buffer_size)); + u32 cursor = cbmem_console->cursor & CURSOR_MASK; + u32 flags = cbmem_console->cursor & ~CURSOR_MASK; + u32 size = cbmem_console->size; + struct seg { /* describes ring buffer segments in logical order */ + u32 phys; /* physical offset from start of mem buffer */ + u32 len; /* length of segment */ + } seg[2] = { {0}, {0} }; + size_t done = 0; + int i; + + if (flags & OVERFLOW) { + if (cursor > size) /* Shouldn't really happen, but... */ + cursor = 0; + seg[0] = (struct seg){.phys = cursor, .len = size - cursor}; + seg[1] = (struct seg){.phys = 0, .len = cursor}; + } else { + seg[0] = (struct seg){.phys = 0, .len = min(cursor, size)}; + } + + for (i = 0; i < ARRAY_SIZE(seg) && count > done; i++) { + done += memory_read_from_buffer(buf + done, count - done, &pos, + cbmem_console->body + seg[i].phys, seg[i].len); + pos -= seg[i].len; + } + return done; } static int memconsole_coreboot_init(phys_addr_t physaddr) @@ -51,7 +82,7 @@ static int memconsole_coreboot_init(phys_addr_t physaddr) return -ENOMEM; cbmem_console = memremap(physaddr, - tmp_cbmc->buffer_size + sizeof(*cbmem_console), + tmp_cbmc->size + sizeof(*cbmem_console), MEMREMAP_WB); memunmap(tmp_cbmc); -- cgit v1.2.3 From 34cfb106d1f8a746fcccbe61c852f705dcdceaa2 Mon Sep 17 00:00:00 2001 From: Dave Gerlach Date: Thu, 18 May 2017 10:07:06 -0500 Subject: misc: sram-exec: Use aligned fncpy instead of memcpy Currently the sram-exec functionality, which allows allocation of executable memory and provides an API to move code to it, is only selected in configs for the ARM architecture. Based on commit 5756e9dd0de6 ("ARM: 6640/1: Thumb-2: Symbol manipulation macros for function body copying") simply copying a C function pointer address using memcpy without consideration of alignment and Thumb is unsafe on ARM platforms. The aforementioned patch introduces the fncpy macro which is a safe way to copy executable code on ARM platforms, so let's make use of that here rather than the unsafe plain memcpy that was previously used by sram_exec_copy. Now sram_exec_copy will move the code to "dst" and return an address that is guaranteed to be safely callable. In the future, architectures hoping to make use of the sram-exec functionality must define an fncpy macro just as ARM has done to guarantee or check for safe copying to executable memory before allowing the arch to select CONFIG_SRAM_EXEC. Acked-by: Tony Lindgren Acked-by: Russell King Reviewed-by: Alexandre Belloni Signed-off-by: Dave Gerlach Signed-off-by: Greg Kroah-Hartman --- drivers/misc/sram-exec.c | 27 ++++++++++++++++++++------- include/linux/sram.h | 8 ++++---- 2 files changed, 24 insertions(+), 11 deletions(-) diff --git a/drivers/misc/sram-exec.c b/drivers/misc/sram-exec.c index 3d528a13b8fc..426ad912b441 100644 --- a/drivers/misc/sram-exec.c +++ b/drivers/misc/sram-exec.c @@ -19,6 +19,7 @@ #include #include +#include #include #include "sram.h" @@ -58,20 +59,32 @@ int sram_add_protect_exec(struct sram_partition *part) * @src: Source address for the data to copy * @size: Size of copy to perform, which starting from dst, must reside in pool * + * Return: Address for copied data that can safely be called through function + * pointer, or NULL if problem. + * * This helper function allows sram driver to act as central control location * of 'protect-exec' pools which are normal sram pools but are always set * read-only and executable except when copying data to them, at which point * they are set to read-write non-executable, to make sure no memory is * writeable and executable at the same time. This region must be page-aligned * and is checked during probe, otherwise page attribute manipulation would - * not be possible. + * not be possible. Care must be taken to only call the returned address as + * dst address is not guaranteed to be safely callable. + * + * NOTE: This function uses the fncpy macro to move code to the executable + * region. Some architectures have strict requirements for relocating + * executable code, so fncpy is a macro that must be defined by any arch + * making use of this functionality that guarantees a safe copy of exec + * data and returns a safe address that can be called as a C function + * pointer. */ -int sram_exec_copy(struct gen_pool *pool, void *dst, void *src, - size_t size) +void *sram_exec_copy(struct gen_pool *pool, void *dst, void *src, + size_t size) { struct sram_partition *part = NULL, *p; unsigned long base; int pages; + void *dst_cpy; mutex_lock(&exec_pool_list_mutex); list_for_each_entry(p, &exec_pool_list, list) { @@ -81,10 +94,10 @@ int sram_exec_copy(struct gen_pool *pool, void *dst, void *src, mutex_unlock(&exec_pool_list_mutex); if (!part) - return -EINVAL; + return NULL; if (!addr_in_gen_pool(pool, (unsigned long)dst, size)) - return -EINVAL; + return NULL; base = (unsigned long)part->base; pages = PAGE_ALIGN(size) / PAGE_SIZE; @@ -94,13 +107,13 @@ int sram_exec_copy(struct gen_pool *pool, void *dst, void *src, set_memory_nx((unsigned long)base, pages); set_memory_rw((unsigned long)base, pages); - memcpy(dst, src, size); + dst_cpy = fncpy(dst, src, size); set_memory_ro((unsigned long)base, pages); set_memory_x((unsigned long)base, pages); mutex_unlock(&part->lock); - return 0; + return dst_cpy; } EXPORT_SYMBOL_GPL(sram_exec_copy); diff --git a/include/linux/sram.h b/include/linux/sram.h index c97dcbe8ce25..4fb405fb0480 100644 --- a/include/linux/sram.h +++ b/include/linux/sram.h @@ -16,12 +16,12 @@ struct gen_pool; #ifdef CONFIG_SRAM_EXEC -int sram_exec_copy(struct gen_pool *pool, void *dst, void *src, size_t size); +void *sram_exec_copy(struct gen_pool *pool, void *dst, void *src, size_t size); #else -static inline int sram_exec_copy(struct gen_pool *pool, void *dst, void *src, - size_t size) +static inline void *sram_exec_copy(struct gen_pool *pool, void *dst, void *src, + size_t size) { - return -ENODEV; + return NULL; } #endif /* CONFIG_SRAM_EXEC */ #endif /* __LINUX_SRAM_H__ */ -- cgit v1.2.3 From 40fbb23881291bb57e4e25e859de8e2287426dac Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Tue, 23 May 2017 16:48:17 -0700 Subject: firmware: google: memconsole: Prevent overrun attack on coreboot console The recent coreboot memory console update (firmware: google: memconsole: Adapt to new coreboot ring buffer format) introduced a small security issue in the driver: The new driver implementation parses the memory console structure again on every access. This is intentional so that additional lines added concurrently by runtime firmware can be read out. However, if an attacker can write to the structure, they could increase the size value to a point where the driver would read potentially sensitive memory areas from outside the original console buffer during the next access. This can be done through /dev/mem, since the console buffer usually resides in firmware-reserved memory that is not covered by STRICT_DEVMEM. This patch resolves that problem by reading the buffer's size value only once during boot (where we can still trust the structure). Other parts of the structure can still be modified at runtime, but the driver's bounds checks make sure that it will never read outside the buffer. Fixes: a5061d028 ("firmware: google: memconsole: Adapt to new coreboot ring buffer format") Signed-off-by: Julius Werner Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/memconsole-coreboot.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/firmware/google/memconsole-coreboot.c b/drivers/firmware/google/memconsole-coreboot.c index 7d39f4ef5d9e..52738887735c 100644 --- a/drivers/firmware/google/memconsole-coreboot.c +++ b/drivers/firmware/google/memconsole-coreboot.c @@ -26,7 +26,7 @@ /* CBMEM firmware console log descriptor. */ struct cbmem_cons { - u32 size; + u32 size_dont_access_after_boot; u32 cursor; u8 body[0]; } __packed; @@ -35,6 +35,7 @@ struct cbmem_cons { #define OVERFLOW (1 << 31) static struct cbmem_cons __iomem *cbmem_console; +static u32 cbmem_console_size; /* * The cbmem_console structure is read again on every access because it may @@ -47,7 +48,7 @@ static ssize_t memconsole_coreboot_read(char *buf, loff_t pos, size_t count) { u32 cursor = cbmem_console->cursor & CURSOR_MASK; u32 flags = cbmem_console->cursor & ~CURSOR_MASK; - u32 size = cbmem_console->size; + u32 size = cbmem_console_size; struct seg { /* describes ring buffer segments in logical order */ u32 phys; /* physical offset from start of mem buffer */ u32 len; /* length of segment */ @@ -81,8 +82,10 @@ static int memconsole_coreboot_init(phys_addr_t physaddr) if (!tmp_cbmc) return -ENOMEM; + /* Read size only once to prevent overrun attack through /dev/mem. */ + cbmem_console_size = tmp_cbmc->size_dont_access_after_boot; cbmem_console = memremap(physaddr, - tmp_cbmc->size + sizeof(*cbmem_console), + cbmem_console_size + sizeof(*cbmem_console), MEMREMAP_WB); memunmap(tmp_cbmc); -- cgit v1.2.3 From 3eec6a1c0cf31b982cad560c16e19fdb1851ae91 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Tue, 23 May 2017 17:07:42 -0700 Subject: firmware: vpd: use kdtrndup when copying section key Instead of open-coding kstrndup with kzalloc + memcpy, let's use the helper. Signed-off-by: Dmitry Torokhov Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/vpd.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c index 1e7860f02f4f..8bd51eaededd 100644 --- a/drivers/firmware/google/vpd.c +++ b/drivers/firmware/google/vpd.c @@ -118,14 +118,13 @@ static int vpd_section_attrib_add(const u8 *key, s32 key_len, info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; - info->key = kzalloc(key_len + 1, GFP_KERNEL); + + info->key = kstrndup(key, key_len, GFP_KERNEL); if (!info->key) { ret = -ENOMEM; goto free_info; } - memcpy(info->key, key, key_len); - sysfs_bin_attr_init(&info->bin_attr); info->bin_attr.attr.name = info->key; info->bin_attr.attr.mode = 0444; -- cgit v1.2.3 From 9920a33e3573a207cd49895080e2806134e5e56f Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Tue, 23 May 2017 17:07:45 -0700 Subject: firmware: vpd: use kasprintf() when forming name of 'raw' attribute When creating name for the "raw" attribute, let's switch to using kaspeintf() instead of doing it by hand. Also make sure we handle errors. Signed-off-by: Dmitry Torokhov Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/vpd.c | 31 +++++++++++++++---------------- 1 file changed, 15 insertions(+), 16 deletions(-) diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c index 8bd51eaededd..66fd0230605e 100644 --- a/drivers/firmware/google/vpd.c +++ b/drivers/firmware/google/vpd.c @@ -190,8 +190,7 @@ static int vpd_section_create_attribs(struct vpd_section *sec) static int vpd_section_init(const char *name, struct vpd_section *sec, phys_addr_t physaddr, size_t size) { - int ret; - int raw_len; + int err; sec->baseaddr = memremap(physaddr, size, MEMREMAP_WB); if (!sec->baseaddr) @@ -200,10 +199,11 @@ static int vpd_section_init(const char *name, struct vpd_section *sec, sec->name = name; /* We want to export the raw partion with name ${name}_raw */ - raw_len = strlen(name) + 5; - sec->raw_name = kzalloc(raw_len, GFP_KERNEL); - strncpy(sec->raw_name, name, raw_len); - strncat(sec->raw_name, "_raw", raw_len); + sec->raw_name = kasprintf(GFP_KERNEL, "%s_raw", name); + if (!sec->raw_name) { + err = -ENOMEM; + goto err_iounmap; + } sysfs_bin_attr_init(&sec->bin_attr); sec->bin_attr.attr.name = sec->raw_name; @@ -212,14 +212,14 @@ static int vpd_section_init(const char *name, struct vpd_section *sec, sec->bin_attr.read = vpd_section_read; sec->bin_attr.private = sec; - ret = sysfs_create_bin_file(vpd_kobj, &sec->bin_attr); - if (ret) - goto free_sec; + err = sysfs_create_bin_file(vpd_kobj, &sec->bin_attr); + if (err) + goto err_free_raw_name; sec->kobj = kobject_create_and_add(name, vpd_kobj); if (!sec->kobj) { - ret = -EINVAL; - goto sysfs_remove; + err = -EINVAL; + goto err_sysfs_remove; } INIT_LIST_HEAD(&sec->attribs); @@ -229,14 +229,13 @@ static int vpd_section_init(const char *name, struct vpd_section *sec, return 0; -sysfs_remove: +err_sysfs_remove: sysfs_remove_bin_file(vpd_kobj, &sec->bin_attr); - -free_sec: +err_free_raw_name: kfree(sec->raw_name); +err_iounmap: iounmap(sec->baseaddr); - - return ret; + return err; } static int vpd_section_destroy(struct vpd_section *sec) -- cgit v1.2.3 From dd246486f94694edb86e898a24a61ebf2f2fdba4 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Tue, 23 May 2017 17:07:46 -0700 Subject: firmware: vpd: do not clear statically allocated data ro_vpd and rw_vpd are static module-scope variables that are guaranteed to be initialized with zeroes, there is no need for explicit memset(). Signed-off-by: Dmitry Torokhov Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/vpd.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c index 66fd0230605e..4f8f99edbbfa 100644 --- a/drivers/firmware/google/vpd.c +++ b/drivers/firmware/google/vpd.c @@ -317,9 +317,6 @@ static int __init vpd_platform_init(void) if (!vpd_kobj) return -ENOMEM; - memset(&ro_vpd, 0, sizeof(ro_vpd)); - memset(&rw_vpd, 0, sizeof(rw_vpd)); - platform_driver_register(&vpd_driver); return 0; -- cgit v1.2.3 From 7975bd4cca05a99aa14964cfa22366ee64da50ad Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Tue, 23 May 2017 17:07:47 -0700 Subject: firmware: vpd: remove platform driver There is no reason why VPD should register platform device and driver, given that we do not use their respective kobjects to attach attributes, nor do we need suspend/resume hooks, or any other features of device core. Signed-off-by: Dmitry Torokhov Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/vpd.c | 44 ++++++++++++++++--------------------------- 1 file changed, 16 insertions(+), 28 deletions(-) diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c index 4f8f99edbbfa..d28f62fed50f 100644 --- a/drivers/firmware/google/vpd.c +++ b/drivers/firmware/google/vpd.c @@ -22,8 +22,6 @@ #include #include #include -#include -#include #include #include @@ -279,47 +277,37 @@ static int vpd_sections_init(phys_addr_t physaddr) ret = vpd_section_init("rw", &rw_vpd, physaddr + sizeof(struct vpd_cbmem) + header.ro_size, header.rw_size); - if (ret) + if (ret) { + vpd_section_destroy(&ro_vpd); return ret; + } } return 0; } -static int vpd_probe(struct platform_device *pdev) -{ - int ret; - struct lb_cbmem_ref entry; - - ret = coreboot_table_find(CB_TAG_VPD, &entry, sizeof(entry)); - if (ret) - return ret; - - return vpd_sections_init(entry.cbmem_addr); -} - -static struct platform_driver vpd_driver = { - .probe = vpd_probe, - .driver = { - .name = "vpd", - }, -}; - static int __init vpd_platform_init(void) { - struct platform_device *pdev; - - pdev = platform_device_register_simple("vpd", -1, NULL, 0); - if (IS_ERR(pdev)) - return PTR_ERR(pdev); + struct lb_cbmem_ref entry; + int err; vpd_kobj = kobject_create_and_add("vpd", firmware_kobj); if (!vpd_kobj) return -ENOMEM; - platform_driver_register(&vpd_driver); + err = coreboot_table_find(CB_TAG_VPD, &entry, sizeof(entry)); + if (err) + goto err_kobject_put; + + err = vpd_sections_init(entry.cbmem_addr); + if (err) + goto err_kobject_put; return 0; + +err_kobject_put: + kobject_put(vpd_kobj); + return err; } static void __exit vpd_platform_exit(void) -- cgit v1.2.3 From e546d778d6bb3e1a80697a6556d870c707e6df82 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Thu, 18 May 2017 10:46:02 -0700 Subject: Drivers: hv: vmbus: Get the current time from the current clocksource The current code uses the MSR based mechanism to get the current tick. Use the current clock source as that might be more optimal. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/mshyperv.h | 1 - drivers/hv/hv.c | 2 +- 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index fba100713924..18325dcdb7f1 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -137,7 +137,6 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) } } -#define hv_get_current_tick(tick) rdmsrl(HV_X64_MSR_TIME_REF_COUNT, tick) #define hv_init_timer(timer, tick) wrmsrl(timer, tick) #define hv_init_timer_config(config, val) wrmsrl(config, val) diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 12e7baecb84e..61fc8ce169a5 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -96,7 +96,7 @@ static int hv_ce_set_next_event(unsigned long delta, WARN_ON(!clockevent_state_oneshot(evt)); - hv_get_current_tick(current_tick); + current_tick = hyperv_cs->read(NULL); current_tick += delta; hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick); return 0; -- cgit v1.2.3 From 4f9bac039a64f6306b613a0d90e6b7e75d7ab0c4 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Thu, 18 May 2017 10:46:03 -0700 Subject: hv_utils: drop .getcrosststamp() support from PTP driver Turns out that our implementation of .getcrosststamp() never actually worked. Hyper-V is sending time samples every 5 seconds and this is too much for get_device_system_crosststamp() as it's interpolation algorithm (which nobody is currently using in kernel, btw) accounts for a 'slow' device but we're not slow in Hyper-V, our time reference is too far away. .getcrosststamp() is not currently used, get_device_system_crosststamp() almost always returns -EINVAL and client falls back to using PTP_SYS_OFFSET so this patch doesn't change much. I also tried doing interpolation manually (e.g. the same way hv_ptp_gettime() works and it turns out that we're getting even lower quality: PTP_SYS_OFFSET_PRECISE with manual interpolation: * PHC0 0 3 37 4 -3974ns[-5338ns] +/- 977ns * PHC0 0 3 77 7 +2227ns[+3184ns] +/- 576ns * PHC0 0 3 177 10 +3060ns[+5220ns] +/- 548ns * PHC0 0 3 377 12 +3937ns[+4371ns] +/- 1414ns * PHC0 0 3 377 6 +764ns[+1240ns] +/- 1047ns * PHC0 0 3 377 7 -1210ns[-3731ns] +/- 479ns * PHC0 0 3 377 9 +153ns[-1019ns] +/- 406ns * PHC0 0 3 377 12 -872ns[-1793ns] +/- 443ns * PHC0 0 3 377 5 +701ns[+3599ns] +/- 426ns * PHC0 0 3 377 5 -923ns[ -375ns] +/- 1062ns PTP_SYS_OFFSET: * PHC0 0 3 7 5 +72ns[+8020ns] +/- 251ns * PHC0 0 3 17 5 -885ns[-3661ns] +/- 254ns * PHC0 0 3 37 6 -454ns[-5732ns] +/- 258ns * PHC0 0 3 77 10 +1183ns[+3754ns] +/- 164ns * PHC0 0 3 377 5 +579ns[+1137ns] +/- 110ns * PHC0 0 3 377 7 +501ns[+1064ns] +/- 96ns * PHC0 0 3 377 9 +1641ns[+3342ns] +/- 106ns * PHC0 0 3 377 8 -47ns[ +77ns] +/- 160ns * PHC0 0 3 377 5 +54ns[ +107ns] +/- 102ns * PHC0 0 3 377 8 -354ns[ -617ns] +/- 89ns This fact wasn't noticed during the initial testing of the PTP device somehow but got revealed now. Let's just drop .getcrosststamp() implementation for now as it doesn't seem to be suitable for us. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv_util.c | 36 ------------------------------------ 1 file changed, 36 deletions(-) diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c index 186b10083c55..2849143bf6f0 100644 --- a/drivers/hv/hv_util.c +++ b/drivers/hv/hv_util.c @@ -248,7 +248,6 @@ static struct adj_time_work wrk; static struct { u64 host_time; u64 ref_time; - struct system_time_snapshot snap; spinlock_t lock; } host_ts; @@ -281,7 +280,6 @@ static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags) cur_reftime = hyperv_cs->read(hyperv_cs); host_ts.host_time = hosttime; host_ts.ref_time = cur_reftime; - ktime_get_snapshot(&host_ts.snap); /* * TimeSync v4 messages contain reference time (guest's Hyper-V @@ -538,46 +536,12 @@ static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts) return 0; } -static int hv_ptp_get_syncdevicetime(ktime_t *device, - struct system_counterval_t *system, - void *ctx) -{ - system->cs = hyperv_cs; - system->cycles = host_ts.ref_time; - *device = ns_to_ktime((host_ts.host_time - WLTIMEDELTA) * 100); - - return 0; -} - -static int hv_ptp_getcrosststamp(struct ptp_clock_info *ptp, - struct system_device_crosststamp *xtstamp) -{ - unsigned long flags; - int ret; - - spin_lock_irqsave(&host_ts.lock, flags); - - /* - * host_ts contains the last time sample from the host and the snapshot - * of system time. We don't need to calculate the time delta between - * the reception and now as get_device_system_crosststamp() does the - * required interpolation. - */ - ret = get_device_system_crosststamp(hv_ptp_get_syncdevicetime, - NULL, &host_ts.snap, xtstamp); - - spin_unlock_irqrestore(&host_ts.lock, flags); - - return ret; -} - static struct ptp_clock_info ptp_hyperv_info = { .name = "hyperv", .enable = hv_ptp_enable, .adjtime = hv_ptp_adjtime, .adjfreq = hv_ptp_adjfreq, .gettime64 = hv_ptp_gettime, - .getcrosststamp = hv_ptp_getcrosststamp, .settime64 = hv_ptp_settime, .owner = THIS_MODULE, }; -- cgit v1.2.3 From 1d10602d306cb7f70545b5e1166efc9409e7d384 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Thu, 18 May 2017 10:46:04 -0700 Subject: hv_utils: fix TimeSync work on pre-TimeSync-v4 hosts It was found that ICTIMESYNCFLAG_SYNC packets are handled incorrectly on WS2012R2, e.g. after the guest is paused and resumed its time is set to something different from host's time. The problem is that we call adj_guesttime() with reftime=0 for these old hosts and we don't account for that in 'if (adj_flags & ICTIMESYNCFLAG_SYNC)' branch and hv_set_host_time(). While we could've solved this by adding a check like 'if (ts_srv_version > TS_VERSION_3)' to hv_set_host_time() I prefer to do some refactoring. We don't need to have two separate containers for host samples, struct host_ts which we use for PTP is enough. Throw away 'struct adj_time_work' and create hv_get_adj_host_time() accessor to host_ts to avoid code duplication. Fixes: 3716a49a81ba ("hv_utils: implement Hyper-V PTP source") Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv_util.c | 128 ++++++++++++++++++++++----------------------------- 1 file changed, 54 insertions(+), 74 deletions(-) diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c index 2849143bf6f0..14dce25c104f 100644 --- a/drivers/hv/hv_util.c +++ b/drivers/hv/hv_util.c @@ -202,27 +202,39 @@ static void shutdown_onchannelcallback(void *context) /* * Set the host time in a process context. */ +static struct work_struct adj_time_work; -struct adj_time_work { - struct work_struct work; - u64 host_time; - u64 ref_time; - u8 flags; -}; +/* + * The last time sample, received from the host. PTP device responds to + * requests by using this data and the current partition-wide time reference + * count. + */ +static struct { + u64 host_time; + u64 ref_time; + spinlock_t lock; +} host_ts; -static void hv_set_host_time(struct work_struct *work) +static struct timespec64 hv_get_adj_host_time(void) { - struct adj_time_work *wrk; - struct timespec64 host_ts; - u64 reftime, newtime; - - wrk = container_of(work, struct adj_time_work, work); + struct timespec64 ts; + u64 newtime, reftime; + unsigned long flags; + spin_lock_irqsave(&host_ts.lock, flags); reftime = hyperv_cs->read(hyperv_cs); - newtime = wrk->host_time + (reftime - wrk->ref_time); - host_ts = ns_to_timespec64((newtime - WLTIMEDELTA) * 100); + newtime = host_ts.host_time + (reftime - host_ts.ref_time); + ts = ns_to_timespec64((newtime - WLTIMEDELTA) * 100); + spin_unlock_irqrestore(&host_ts.lock, flags); - do_settimeofday64(&host_ts); + return ts; +} + +static void hv_set_host_time(struct work_struct *work) +{ + struct timespec64 ts = hv_get_adj_host_time(); + + do_settimeofday64(&ts); } /* @@ -238,60 +250,35 @@ static void hv_set_host_time(struct work_struct *work) * typically used as a hint to the guest. The guest is under no obligation * to discipline the clock. */ -static struct adj_time_work wrk; - -/* - * The last time sample, received from the host. PTP device responds to - * requests by using this data and the current partition-wide time reference - * count. - */ -static struct { - u64 host_time; - u64 ref_time; - spinlock_t lock; -} host_ts; - static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags) { unsigned long flags; u64 cur_reftime; /* - * This check is safe since we are executing in the - * interrupt context and time synch messages are always - * delivered on the same CPU. + * Save the adjusted time sample from the host and the snapshot + * of the current system time. */ - if (adj_flags & ICTIMESYNCFLAG_SYNC) { - /* Queue a job to do do_settimeofday64() */ - if (work_pending(&wrk.work)) - return; - - wrk.host_time = hosttime; - wrk.ref_time = reftime; - wrk.flags = adj_flags; - schedule_work(&wrk.work); - } else { - /* - * Save the adjusted time sample from the host and the snapshot - * of the current system time for PTP device. - */ - spin_lock_irqsave(&host_ts.lock, flags); - - cur_reftime = hyperv_cs->read(hyperv_cs); - host_ts.host_time = hosttime; - host_ts.ref_time = cur_reftime; - - /* - * TimeSync v4 messages contain reference time (guest's Hyper-V - * clocksource read when the time sample was generated), we can - * improve the precision by adding the delta between now and the - * time of generation. - */ - if (ts_srv_version > TS_VERSION_3) - host_ts.host_time += (cur_reftime - reftime); - - spin_unlock_irqrestore(&host_ts.lock, flags); - } + spin_lock_irqsave(&host_ts.lock, flags); + + cur_reftime = hyperv_cs->read(hyperv_cs); + host_ts.host_time = hosttime; + host_ts.ref_time = cur_reftime; + + /* + * TimeSync v4 messages contain reference time (guest's Hyper-V + * clocksource read when the time sample was generated), we can + * improve the precision by adding the delta between now and the + * time of generation. For older protocols we set + * reftime == cur_reftime on call. + */ + host_ts.host_time += (cur_reftime - reftime); + + spin_unlock_irqrestore(&host_ts.lock, flags); + + /* Schedule work to do do_settimeofday64() */ + if (adj_flags & ICTIMESYNCFLAG_SYNC) + schedule_work(&adj_time_work); } /* @@ -339,8 +326,8 @@ static void timesync_onchannelcallback(void *context) sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr)]; adj_guesttime(timedatap->parenttime, - 0, - timedatap->flags); + hyperv_cs->read(hyperv_cs), + timedatap->flags); } } @@ -524,14 +511,7 @@ static int hv_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts) { - unsigned long flags; - u64 newtime, reftime; - - spin_lock_irqsave(&host_ts.lock, flags); - reftime = hyperv_cs->read(hyperv_cs); - newtime = host_ts.host_time + (reftime - host_ts.ref_time); - *ts = ns_to_timespec64((newtime - WLTIMEDELTA) * 100); - spin_unlock_irqrestore(&host_ts.lock, flags); + *ts = hv_get_adj_host_time(); return 0; } @@ -556,7 +536,7 @@ static int hv_timesync_init(struct hv_util_service *srv) spin_lock_init(&host_ts.lock); - INIT_WORK(&wrk.work, hv_set_host_time); + INIT_WORK(&adj_time_work, hv_set_host_time); /* * ptp_clock_register() returns NULL when CONFIG_PTP_1588_CLOCK is @@ -577,7 +557,7 @@ static void hv_timesync_deinit(void) { if (hv_ptp_clock) ptp_clock_unregister(hv_ptp_clock); - cancel_work_sync(&wrk.work); + cancel_work_sync(&adj_time_work); } static int __init init_hyperv_utils(void) -- cgit v1.2.3 From e917a5e23a87e24931625c344daea834cd2d6f2f Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Thu, 18 May 2017 10:46:05 -0700 Subject: drivers: hv: vmbus: Increase the time between retries in vmbus_post_msg() Commit c0bb03924f1a ("Drivers: hv: vmbus: Raise retry/wait limits in vmbus_post_msg()") increased the retry/wait limits of vmbus_post_msg() to address the new DoS protection policies in WS2016. Increase the time between retries to make the code more robust. Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/connection.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index c2d74ee95f60..59c11ff90d12 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -390,7 +390,7 @@ int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep) else mdelay(usec / 1000); - if (usec < 256000) + if (retries < 22) usec *= 2; } return ret; -- cgit v1.2.3 From 3110010896f17f381bd74d72b9d4a46a087c46b8 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Thu, 18 May 2017 10:46:06 -0700 Subject: vmbus: Reuse uuid_le_to_bin() helper Instead of open coded variant use generic helper to convert UUID strings to binary format. Signed-off-by: Andy Shevchenko Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/vmbus_drv.c | 51 ++++++++++---------------------------------------- 1 file changed, 10 insertions(+), 41 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 59bb3efa6e10..ed84e96715a0 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -608,40 +608,6 @@ static void vmbus_free_dynids(struct hv_driver *drv) spin_unlock(&drv->dynids.lock); } -/* Parse string of form: 1b4e28ba-2fa1-11d2-883f-b9a761bde3f */ -static int get_uuid_le(const char *str, uuid_le *uu) -{ - unsigned int b[16]; - int i; - - if (strlen(str) < 37) - return -1; - - for (i = 0; i < 36; i++) { - switch (i) { - case 8: case 13: case 18: case 23: - if (str[i] != '-') - return -1; - break; - default: - if (!isxdigit(str[i])) - return -1; - } - } - - /* unparse little endian output byte order */ - if (sscanf(str, - "%2x%2x%2x%2x-%2x%2x-%2x%2x-%2x%2x-%2x%2x%2x%2x%2x%2x", - &b[3], &b[2], &b[1], &b[0], - &b[5], &b[4], &b[7], &b[6], &b[8], &b[9], - &b[10], &b[11], &b[12], &b[13], &b[14], &b[15]) != 16) - return -1; - - for (i = 0; i < 16; i++) - uu->b[i] = b[i]; - return 0; -} - /* * store_new_id - sysfs frontend to vmbus_add_dynid() * @@ -651,11 +617,12 @@ static ssize_t new_id_store(struct device_driver *driver, const char *buf, size_t count) { struct hv_driver *drv = drv_to_hv_drv(driver); - uuid_le guid = NULL_UUID_LE; + uuid_le guid; ssize_t retval; - if (get_uuid_le(buf, &guid) != 0) - return -EINVAL; + retval = uuid_le_to_bin(buf, &guid); + if (retval) + return retval; if (hv_vmbus_get_id(drv, &guid)) return -EEXIST; @@ -677,12 +644,14 @@ static ssize_t remove_id_store(struct device_driver *driver, const char *buf, { struct hv_driver *drv = drv_to_hv_drv(driver); struct vmbus_dynid *dynid, *n; - uuid_le guid = NULL_UUID_LE; - size_t retval = -ENODEV; + uuid_le guid; + ssize_t retval; - if (get_uuid_le(buf, &guid)) - return -EINVAL; + retval = uuid_le_to_bin(buf, &guid); + if (retval) + return retval; + retval = -ENODEV; spin_lock(&drv->dynids.lock); list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { struct hv_vmbus_device_id *id = &dynid->id; -- cgit v1.2.3 From 13b9abfc92be7c4454bff912021b9f835dea6e15 Mon Sep 17 00:00:00 2001 From: Michael Kelley Date: Thu, 18 May 2017 10:46:07 -0700 Subject: Drivers: hv: vmbus: Close timing hole that can corrupt per-cpu page Extend the disabling of preemption to include the hypercall so that another thread can't get the CPU and corrupt the per-cpu page used for hypercall arguments. Cc: #4.11 Signed-off-by: Michael Kelley Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 61fc8ce169a5..2ea12207caa0 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -82,10 +82,15 @@ int hv_post_message(union hv_connection_id connection_id, aligned_msg->message_type = message_type; aligned_msg->payload_size = payload_size; memcpy((void *)aligned_msg->payload, payload, payload_size); - put_cpu_ptr(hv_cpu); status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); + /* Preemption must remain disabled until after the hypercall + * so some other thread can't get scheduled onto this cpu and + * corrupt the per-cpu post_msg_page + */ + put_cpu_ptr(hv_cpu); + return status & 0xFFFF; } -- cgit v1.2.3 From 50fa2951bd744d2a82aa33074001efac12d4e1cf Mon Sep 17 00:00:00 2001 From: "Andrew F. Davis" Date: Tue, 16 May 2017 15:02:12 -0500 Subject: w1: Organize driver source to natural/common order Structures and functions should be ordered such that forward declaration use is minimized. MODULE_* macros should immediately follow the structures and functions upon which they act. Remaining MODULE_* macros should be at the end of the file in alphabetical order. Signed-off-by: Andrew F. Davis Acked-by: Evgeniy Polyakov Signed-off-by: Greg Kroah-Hartman --- drivers/w1/masters/ds2482.c | 45 ++++++++++++++------------------- drivers/w1/masters/ds2490.c | 33 ++++++++++-------------- drivers/w1/masters/matrox_w1.c | 40 +++++++++++++---------------- drivers/w1/masters/omap_hdq.c | 57 ++++++++++++++++++------------------------ drivers/w1/slaves/w1_bq27000.c | 9 +++---- drivers/w1/slaves/w1_ds2406.c | 8 +++--- drivers/w1/slaves/w1_ds2408.c | 11 ++++---- drivers/w1/slaves/w1_ds2413.c | 10 ++++---- drivers/w1/slaves/w1_ds2423.c | 2 +- drivers/w1/slaves/w1_ds2431.c | 2 +- drivers/w1/slaves/w1_ds2433.c | 10 ++++---- drivers/w1/slaves/w1_ds2760.c | 11 ++++---- drivers/w1/slaves/w1_ds2780.c | 2 +- drivers/w1/slaves/w1_ds2781.c | 2 +- drivers/w1/slaves/w1_ds28e04.c | 10 ++++---- drivers/w1/slaves/w1_smem.c | 12 ++++----- drivers/w1/slaves/w1_therm.c | 18 ++++++------- drivers/w1/w1.c | 18 +++++++------ drivers/w1/w1_family.c | 5 ++-- drivers/w1/w1_int.c | 3 +-- 20 files changed, 138 insertions(+), 170 deletions(-) diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c index 2e30db1b1a43..e8730ea3e3aa 100644 --- a/drivers/w1/masters/ds2482.c +++ b/drivers/w1/masters/ds2482.c @@ -35,6 +35,8 @@ */ static int ds2482_active_pullup = 1; module_param_named(active_pullup, ds2482_active_pullup, int, 0644); +MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): " \ + "0-disable, 1-enable (default)"); /** * The DS2482 registers - there are 3 registers that are addressed by a read @@ -93,30 +95,6 @@ static const u8 ds2482_chan_rd[8] = #define DS2482_REG_STS_PPD 0x02 #define DS2482_REG_STS_1WB 0x01 - -static int ds2482_probe(struct i2c_client *client, - const struct i2c_device_id *id); -static int ds2482_remove(struct i2c_client *client); - - -/** - * Driver data (common to all clients) - */ -static const struct i2c_device_id ds2482_id[] = { - { "ds2482", 0 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, ds2482_id); - -static struct i2c_driver ds2482_driver = { - .driver = { - .name = "ds2482", - }, - .probe = ds2482_probe, - .remove = ds2482_remove, - .id_table = ds2482_id, -}; - /* * Client data (each client gets its own) */ @@ -560,10 +538,25 @@ static int ds2482_remove(struct i2c_client *client) return 0; } +/** + * Driver data (common to all clients) + */ +static const struct i2c_device_id ds2482_id[] = { + { "ds2482", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ds2482_id); + +static struct i2c_driver ds2482_driver = { + .driver = { + .name = "ds2482", + }, + .probe = ds2482_probe, + .remove = ds2482_remove, + .id_table = ds2482_id, +}; module_i2c_driver(ds2482_driver); -MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): " \ - "0-disable, 1-enable (default)"); MODULE_AUTHOR("Ben Gardner "); MODULE_DESCRIPTION("DS2482 driver"); MODULE_LICENSE("GPL"); diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c index be77b7914fad..d748e34d4ce5 100644 --- a/drivers/w1/masters/ds2490.c +++ b/drivers/w1/masters/ds2490.c @@ -179,28 +179,9 @@ struct ds_status u8 reserved2; }; -static struct usb_device_id ds_id_table [] = { - { USB_DEVICE(0x04fa, 0x2490) }, - { }, -}; -MODULE_DEVICE_TABLE(usb, ds_id_table); - -static int ds_probe(struct usb_interface *, const struct usb_device_id *); -static void ds_disconnect(struct usb_interface *); - -static int ds_send_control(struct ds_device *, u16, u16); -static int ds_send_control_cmd(struct ds_device *, u16, u16); - static LIST_HEAD(ds_devices); static DEFINE_MUTEX(ds_mutex); -static struct usb_driver ds_driver = { - .name = "DS9490R", - .probe = ds_probe, - .disconnect = ds_disconnect, - .id_table = ds_id_table, -}; - static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index) { int err; @@ -1108,8 +1089,20 @@ static void ds_disconnect(struct usb_interface *intf) kfree(dev); } +static struct usb_device_id ds_id_table [] = { + { USB_DEVICE(0x04fa, 0x2490) }, + { }, +}; +MODULE_DEVICE_TABLE(usb, ds_id_table); + +static struct usb_driver ds_driver = { + .name = "DS9490R", + .probe = ds_probe, + .disconnect = ds_disconnect, + .id_table = ds_id_table, +}; module_usb_driver(ds_driver); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Evgeniy Polyakov "); MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)"); +MODULE_LICENSE("GPL"); diff --git a/drivers/w1/masters/matrox_w1.c b/drivers/w1/masters/matrox_w1.c index 97a676bf5989..f20d03ecfd1d 100644 --- a/drivers/w1/masters/matrox_w1.c +++ b/drivers/w1/masters/matrox_w1.c @@ -37,26 +37,6 @@ #include "../w1.h" #include "../w1_int.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov "); -MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire protocol) over VGA DDC(matrox gpio)."); - -static struct pci_device_id matrox_w1_tbl[] = { - { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) }, - { }, -}; -MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); - -static int matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); -static void matrox_w1_remove(struct pci_dev *); - -static struct pci_driver matrox_w1_pci_driver = { - .name = "matrox_w1", - .id_table = matrox_w1_tbl, - .probe = matrox_w1_probe, - .remove = matrox_w1_remove, -}; - /* * Matrox G400 DDC registers. */ @@ -88,9 +68,6 @@ struct matrox_device struct w1_bus_master *bus_master; }; -static u8 matrox_w1_read_ddc_bit(void *); -static void matrox_w1_write_ddc_bit(void *, u8); - /* * These functions read and write DDC Data bit. * @@ -226,4 +203,21 @@ static void matrox_w1_remove(struct pci_dev *pdev) } kfree(dev); } + +static struct pci_device_id matrox_w1_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) }, + { }, +}; +MODULE_DEVICE_TABLE(pci, matrox_w1_tbl); + +static struct pci_driver matrox_w1_pci_driver = { + .name = "matrox_w1", + .id_table = matrox_w1_tbl, + .probe = matrox_w1_probe, + .remove = matrox_w1_remove, +}; module_pci_driver(matrox_w1_pci_driver); + +MODULE_AUTHOR("Evgeniy Polyakov "); +MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire protocol) over VGA DDC(matrox gpio)."); +MODULE_LICENSE("GPL"); diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c index fb190c259607..3302cbd2344a 100644 --- a/drivers/w1/masters/omap_hdq.c +++ b/drivers/w1/masters/omap_hdq.c @@ -53,7 +53,10 @@ #define OMAP_HDQ_MAX_USER 4 static DECLARE_WAIT_QUEUE_HEAD(hdq_wait_queue); + static int w1_id; +module_param(w1_id, int, S_IRUSR); +MODULE_PARM_DESC(w1_id, "1-wire id for the slave detection in HDQ mode"); struct hdq_data { struct device *dev; @@ -76,36 +79,6 @@ struct hdq_data { }; -static int omap_hdq_probe(struct platform_device *pdev); -static int omap_hdq_remove(struct platform_device *pdev); - -static const struct of_device_id omap_hdq_dt_ids[] = { - { .compatible = "ti,omap3-1w" }, - { .compatible = "ti,am4372-hdq" }, - {} -}; -MODULE_DEVICE_TABLE(of, omap_hdq_dt_ids); - -static struct platform_driver omap_hdq_driver = { - .probe = omap_hdq_probe, - .remove = omap_hdq_remove, - .driver = { - .name = "omap_hdq", - .of_match_table = omap_hdq_dt_ids, - }, -}; - -static u8 omap_w1_read_byte(void *_hdq); -static void omap_w1_write_byte(void *_hdq, u8 byte); -static u8 omap_w1_reset_bus(void *_hdq); - - -static struct w1_bus_master omap_w1_master = { - .read_byte = omap_w1_read_byte, - .write_byte = omap_w1_write_byte, - .reset_bus = omap_w1_reset_bus, -}; - /* HDQ register I/O routines */ static inline u8 hdq_reg_in(struct hdq_data *hdq_data, u32 offset) { @@ -678,6 +651,12 @@ static void omap_w1_write_byte(void *_hdq, u8 byte) } } +static struct w1_bus_master omap_w1_master = { + .read_byte = omap_w1_read_byte, + .write_byte = omap_w1_write_byte, + .reset_bus = omap_w1_reset_bus, +}; + static int omap_hdq_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -787,10 +766,22 @@ static int omap_hdq_remove(struct platform_device *pdev) return 0; } -module_platform_driver(omap_hdq_driver); +static const struct of_device_id omap_hdq_dt_ids[] = { + { .compatible = "ti,omap3-1w" }, + { .compatible = "ti,am4372-hdq" }, + {} +}; +MODULE_DEVICE_TABLE(of, omap_hdq_dt_ids); -module_param(w1_id, int, S_IRUSR); -MODULE_PARM_DESC(w1_id, "1-wire id for the slave detection in HDQ mode"); +static struct platform_driver omap_hdq_driver = { + .probe = omap_hdq_probe, + .remove = omap_hdq_remove, + .driver = { + .name = "omap_hdq", + .of_match_table = omap_hdq_dt_ids, + }, +}; +module_platform_driver(omap_hdq_driver); MODULE_AUTHOR("Texas Instruments"); MODULE_DESCRIPTION("HDQ-1W driver Library"); diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c index 9f4a86b754ba..d480900a28ab 100644 --- a/drivers/w1/slaves/w1_bq27000.c +++ b/drivers/w1/slaves/w1_bq27000.c @@ -25,6 +25,8 @@ #define HDQ_CMD_WRITE (1<<7) static int F_ID; +module_param(F_ID, int, S_IRUSR); +MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device"); static int w1_bq27000_read(struct device *dev, unsigned int reg) { @@ -106,13 +108,10 @@ static void __exit w1_bq27000_exit(void) w1_unregister_family(&w1_bq27000_family); } - module_init(w1_bq27000_init); module_exit(w1_bq27000_exit); -module_param(F_ID, int, S_IRUSR); -MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device"); -MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000)); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Texas Instruments Ltd"); MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000)); diff --git a/drivers/w1/slaves/w1_ds2406.c b/drivers/w1/slaves/w1_ds2406.c index 51f2f66d6555..709bd5e02eed 100644 --- a/drivers/w1/slaves/w1_ds2406.c +++ b/drivers/w1/slaves/w1_ds2406.c @@ -21,10 +21,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Scott Alfter "); -MODULE_DESCRIPTION("w1 family 12 driver for DS2406 2 Pin IO"); - #define W1_F12_FUNC_READ_STATUS 0xAA #define W1_F12_FUNC_WRITE_STATUS 0x55 @@ -154,3 +150,7 @@ static struct w1_family w1_family_12 = { .fops = &w1_f12_fops, }; module_w1_family(w1_family_12); + +MODULE_AUTHOR("Scott Alfter "); +MODULE_DESCRIPTION("w1 family 12 driver for DS2406 2 Pin IO"); +MODULE_LICENSE("GPL"); diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c index aec5958e66e9..e01d2b3997bc 100644 --- a/drivers/w1/slaves/w1_ds2408.c +++ b/drivers/w1/slaves/w1_ds2408.c @@ -19,12 +19,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Jean-Francois Dagenais "); -MODULE_DESCRIPTION("w1 family 29 driver for DS2408 8 Pin IO"); -MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2408)); - - #define W1_F29_RETRIES 3 #define W1_F29_REG_LOGIG_STATE 0x88 /* R */ @@ -352,3 +346,8 @@ static struct w1_family w1_family_29 = { .fops = &w1_f29_fops, }; module_w1_family(w1_family_29); + +MODULE_AUTHOR("Jean-Francois Dagenais "); +MODULE_DESCRIPTION("w1 family 29 driver for DS2408 8 Pin IO"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2408)); diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c index f2e1c51533b9..9cc6f0bc2e95 100644 --- a/drivers/w1/slaves/w1_ds2413.c +++ b/drivers/w1/slaves/w1_ds2413.c @@ -20,11 +20,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Mariusz Bialonczyk "); -MODULE_DESCRIPTION("w1 family 3a driver for DS2413 2 Pin IO"); -MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413)); - #define W1_F3A_RETRIES 3 #define W1_F3A_FUNC_PIO_ACCESS_READ 0xF5 #define W1_F3A_FUNC_PIO_ACCESS_WRITE 0x5A @@ -136,3 +131,8 @@ static struct w1_family w1_family_3a = { .fops = &w1_f3a_fops, }; module_w1_family(w1_family_3a); + +MODULE_AUTHOR("Mariusz Bialonczyk "); +MODULE_DESCRIPTION("w1 family 3a driver for DS2413 2 Pin IO"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413)); diff --git a/drivers/w1/slaves/w1_ds2423.c b/drivers/w1/slaves/w1_ds2423.c index 4ab54fd9dde2..306240fe496c 100644 --- a/drivers/w1/slaves/w1_ds2423.c +++ b/drivers/w1/slaves/w1_ds2423.c @@ -140,7 +140,7 @@ static struct w1_family w1_family_1d = { }; module_w1_family(w1_family_1d); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Mika Laitio "); MODULE_DESCRIPTION("w1 family 1d driver for DS2423, 4 counters and 4kb ram"); +MODULE_LICENSE("GPL"); MODULE_ALIAS("w1-family-" __stringify(W1_COUNTER_DS2423)); diff --git a/drivers/w1/slaves/w1_ds2431.c b/drivers/w1/slaves/w1_ds2431.c index 80572cb63ba8..20182d4a4b19 100644 --- a/drivers/w1/slaves/w1_ds2431.c +++ b/drivers/w1/slaves/w1_ds2431.c @@ -290,7 +290,7 @@ static struct w1_family w1_family_2d = { }; module_w1_family(w1_family_2d); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Bernhard Weirich "); MODULE_DESCRIPTION("w1 family 2d driver for DS2431, 1kb EEPROM"); +MODULE_LICENSE("GPL"); MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2431)); diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c index 6cf378c89ecb..86c30aceea3e 100644 --- a/drivers/w1/slaves/w1_ds2433.c +++ b/drivers/w1/slaves/w1_ds2433.c @@ -26,11 +26,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Ben Gardner "); -MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM"); -MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433)); - #define W1_EEPROM_SIZE 512 #define W1_PAGE_COUNT 16 #define W1_PAGE_SIZE 32 @@ -306,3 +301,8 @@ static struct w1_family w1_family_23 = { .fops = &w1_f23_fops, }; module_w1_family(w1_family_23); + +MODULE_AUTHOR("Ben Gardner "); +MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433)); diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c index ffa37f773b3b..f35d1e2ef9bb 100644 --- a/drivers/w1/slaves/w1_ds2760.c +++ b/drivers/w1/slaves/w1_ds2760.c @@ -63,11 +63,13 @@ int w1_ds2760_read(struct device *dev, char *buf, int addr, size_t count) { return w1_ds2760_io(dev, buf, addr, count, 0); } +EXPORT_SYMBOL(w1_ds2760_read); int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count) { return w1_ds2760_io(dev, buf, addr, count, 1); } +EXPORT_SYMBOL(w1_ds2760_write); static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd) { @@ -91,11 +93,13 @@ int w1_ds2760_store_eeprom(struct device *dev, int addr) { return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA); } +EXPORT_SYMBOL(w1_ds2760_store_eeprom); int w1_ds2760_recall_eeprom(struct device *dev, int addr) { return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA); } +EXPORT_SYMBOL(w1_ds2760_recall_eeprom); static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, @@ -164,12 +168,7 @@ static struct w1_family w1_ds2760_family = { }; module_w1_family(w1_ds2760_family); -EXPORT_SYMBOL(w1_ds2760_read); -EXPORT_SYMBOL(w1_ds2760_write); -EXPORT_SYMBOL(w1_ds2760_store_eeprom); -EXPORT_SYMBOL(w1_ds2760_recall_eeprom); - -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Szabolcs Gyurko "); MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip"); +MODULE_LICENSE("GPL"); MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760)); diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c index f5c2aa429a92..292972212107 100644 --- a/drivers/w1/slaves/w1_ds2780.c +++ b/drivers/w1/slaves/w1_ds2780.c @@ -156,7 +156,7 @@ static struct w1_family w1_ds2780_family = { }; module_w1_family(w1_ds2780_family); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Clifton Barnes "); MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC"); +MODULE_LICENSE("GPL"); MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780)); diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c index 9c03e014cf9e..a5d75067b230 100644 --- a/drivers/w1/slaves/w1_ds2781.c +++ b/drivers/w1/slaves/w1_ds2781.c @@ -153,7 +153,7 @@ static struct w1_family w1_ds2781_family = { }; module_w1_family(w1_ds2781_family); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Renata Sayakhova "); MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC"); +MODULE_LICENSE("GPL"); MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781)); diff --git a/drivers/w1/slaves/w1_ds28e04.c b/drivers/w1/slaves/w1_ds28e04.c index 5e348d38ec5c..c62858c05e8f 100644 --- a/drivers/w1/slaves/w1_ds28e04.c +++ b/drivers/w1/slaves/w1_ds28e04.c @@ -24,11 +24,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Markus Franke , "); -MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO"); -MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS28E04)); - /* Allow the strong pullup to be disabled, but default to enabled. * If it was disabled a parasite powered device might not get the required * current to copy the data from the scratchpad to EEPROM. If it is enabled @@ -428,3 +423,8 @@ static struct w1_family w1_family_1C = { .fops = &w1_f1C_fops, }; module_w1_family(w1_family_1C); + +MODULE_AUTHOR("Markus Franke , "); +MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS28E04)); diff --git a/drivers/w1/slaves/w1_smem.c b/drivers/w1/slaves/w1_smem.c index ed4c87506def..99b03bfb9941 100644 --- a/drivers/w1/slaves/w1_smem.c +++ b/drivers/w1/slaves/w1_smem.c @@ -31,12 +31,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov "); -MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family."); -MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_01)); -MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_81)); - static struct w1_family w1_smem_family_01 = { .fid = W1_FAMILY_SMEM_01, }; @@ -70,3 +64,9 @@ static void __exit w1_smem_fini(void) module_init(w1_smem_init); module_exit(w1_smem_fini); + +MODULE_AUTHOR("Evgeniy Polyakov "); +MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family."); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_01)); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_81)); diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index 82611f197b0a..ccaf29994a42 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -34,15 +34,6 @@ #include "../w1_int.h" #include "../w1_family.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov "); -MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family."); -MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20)); -MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822)); -MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20)); -MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825)); -MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00)); - /* Allow the strong pullup to be disabled, but default to enabled. * If it was disabled a parasite powered device might not get the require * current to do a temperature conversion. If it is enabled parasite powered @@ -646,3 +637,12 @@ static void __exit w1_therm_fini(void) module_init(w1_therm_init); module_exit(w1_therm_fini); + +MODULE_AUTHOR("Evgeniy Polyakov "); +MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family."); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825)); +MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00)); diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 8511d1685db9..8172dee5e23c 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -33,20 +33,15 @@ #include "w1_family.h" #include "w1_netlink.h" -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Evgeniy Polyakov "); -MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); - static int w1_timeout = 10; -static int w1_timeout_us = 0; -int w1_max_slave_count = 64; -int w1_max_slave_ttl = 10; - module_param_named(timeout, w1_timeout, int, 0); MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); + +static int w1_timeout_us = 0; module_param_named(timeout_us, w1_timeout_us, int, 0); MODULE_PARM_DESC(timeout_us, "time in microseconds between automatic slave searches"); + /* A search stops when w1_max_slave_count devices have been found in that * search. The next search will start over and detect the same set of devices * on a static 1-wire bus. Memory is not allocated based on this number, just @@ -55,9 +50,12 @@ MODULE_PARM_DESC(timeout_us, * device on the network and w1_max_slave_count is set to 1, the device id can * be read directly skipping the normal slower search process. */ +int w1_max_slave_count = 64; module_param_named(max_slave_count, w1_max_slave_count, int, 0); MODULE_PARM_DESC(max_slave_count, "maximum number of slaves detected in a search"); + +int w1_max_slave_ttl = 10; module_param_named(slave_ttl, w1_max_slave_ttl, int, 0); MODULE_PARM_DESC(slave_ttl, "Number of searches not seeing a slave before it will be removed"); @@ -1228,3 +1226,7 @@ static void __exit w1_fini(void) module_init(w1_init); module_exit(w1_fini); + +MODULE_AUTHOR("Evgeniy Polyakov "); +MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol."); +MODULE_LICENSE("GPL"); diff --git a/drivers/w1/w1_family.c b/drivers/w1/w1_family.c index 2096f460498f..9759cdaf22f4 100644 --- a/drivers/w1/w1_family.c +++ b/drivers/w1/w1_family.c @@ -55,6 +55,7 @@ int w1_register_family(struct w1_family *newf) return ret; } +EXPORT_SYMBOL(w1_register_family); /** * w1_unregister_family() - unregister a device family driver @@ -87,6 +88,7 @@ void w1_unregister_family(struct w1_family *fent) flush_signals(current); } } +EXPORT_SYMBOL(w1_unregister_family); /* * Should be called under w1_flock held. @@ -136,6 +138,3 @@ void __w1_family_get(struct w1_family *f) atomic_inc(&f->refcnt); smp_mb__after_atomic(); } - -EXPORT_SYMBOL(w1_unregister_family); -EXPORT_SYMBOL(w1_register_family); diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 1072a2e620bb..4439d10709bb 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -179,6 +179,7 @@ err_out_free_dev: return retval; } +EXPORT_SYMBOL(w1_add_master_device); void __w1_remove_master_device(struct w1_master *dev) { @@ -251,6 +252,4 @@ void w1_remove_master_device(struct w1_bus_master *bm) __w1_remove_master_device(found); } - -EXPORT_SYMBOL(w1_add_master_device); EXPORT_SYMBOL(w1_remove_master_device); -- cgit v1.2.3 From 8bb2d27f837d72f247bfa341a5ccf2d54d2b7d2d Mon Sep 17 00:00:00 2001 From: Alexander Usyskin Date: Sun, 30 Apr 2017 13:12:10 +0300 Subject: mei: make mei_cl_bus_rescan static mei_cl_bus_rescan is used only in bus.c, so make it local to the file and mark static. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/bus.c | 2 +- drivers/misc/mei/mei_dev.h | 1 - 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index d1928fdd0f43..42078e6be47f 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -1038,7 +1038,7 @@ static void mei_cl_bus_dev_init(struct mei_device *bus, * * @bus: mei device */ -void mei_cl_bus_rescan(struct mei_device *bus) +static void mei_cl_bus_rescan(struct mei_device *bus) { struct mei_cl_device *cldev, *n; struct mei_me_client *me_cl; diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index 63a67c99fc78..ebcd5132e447 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -306,7 +306,6 @@ struct mei_hw_ops { }; /* MEI bus API*/ -void mei_cl_bus_rescan(struct mei_device *bus); void mei_cl_bus_rescan_work(struct work_struct *work); void mei_cl_bus_dev_fixup(struct mei_cl_device *dev); ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, -- cgit v1.2.3 From b6a38565e6d783a16854654b3cfb3a178768b37a Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Sun, 30 Apr 2017 13:12:11 +0300 Subject: mei: hw: fix a spelling mistake notifcation -> notification Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/hw.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h index e1e4d47d4d7d..5c8286b40b62 100644 --- a/drivers/misc/mei/hw.h +++ b/drivers/misc/mei/hw.h @@ -65,7 +65,7 @@ #define HBM_MAJOR_VERSION_DOT 2 /* - * MEI version with notifcation support + * MEI version with notification support */ #define HBM_MINOR_VERSION_EV 0 #define HBM_MAJOR_VERSION_EV 2 -- cgit v1.2.3 From 70caf709164b7347326205ea19cfafea7d002f81 Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Thu, 27 Apr 2017 18:41:34 +0100 Subject: goldfish_pipe: make pipe_dev static Make this static as it's only referenced in this source and it does not need global scope. Cleans up a sparse warning: drivers/platform/goldfish/goldfish_pipe.c: warning: symbol 'pipe_dev' was not declared. Should it be static? Signed-off-by: Colin Ian King Signed-off-by: Greg Kroah-Hartman --- drivers/platform/goldfish/goldfish_pipe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c index 2de1e603bd2b..8a4b088c52a7 100644 --- a/drivers/platform/goldfish/goldfish_pipe.c +++ b/drivers/platform/goldfish/goldfish_pipe.c @@ -266,7 +266,7 @@ struct goldfish_pipe_dev { unsigned char __iomem *base; }; -struct goldfish_pipe_dev pipe_dev[1] = {}; +static struct goldfish_pipe_dev pipe_dev[1] = {}; static int goldfish_cmd_locked(struct goldfish_pipe *pipe, enum PipeCmdCode cmd) { -- cgit v1.2.3 From 4654bdb63910eaafd586c7c12b473ecc0b3ab94a Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Tue, 25 Apr 2017 16:13:34 +0000 Subject: auxdisplay: Convert list_for_each to entry variant convert list_for_each() to list_for_each_entry() where applicable. Signed-off-by: Wei Yongjun Reviewed-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/auxdisplay/panel.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c index e0c014c2356f..7a8b8fb2f572 100644 --- a/drivers/auxdisplay/panel.c +++ b/drivers/auxdisplay/panel.c @@ -1345,14 +1345,11 @@ static inline void input_state_falling(struct logical_input *input) static void panel_process_inputs(void) { - struct list_head *item; struct logical_input *input; keypressed = 0; inputs_stable = 1; - list_for_each(item, &logical_inputs) { - input = list_entry(item, struct logical_input, list); - + list_for_each_entry(input, &logical_inputs, list) { switch (input->state) { case INPUT_ST_LOW: if ((phys_curr & input->mask) != input->value) -- cgit v1.2.3 From 610387d162eb1beb6eb2009af5175dc6b44b8da6 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Sun, 21 May 2017 22:42:32 +0200 Subject: misc: apds990x: move header file out of I2C realm include/linux/i2c is not for client devices. Move the header file to a more appropriate location. Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/misc/apds990x.c | 2 +- include/linux/i2c/apds990x.h | 79 ---------------------------------- include/linux/platform_data/apds990x.h | 79 ++++++++++++++++++++++++++++++++++ 3 files changed, 80 insertions(+), 80 deletions(-) delete mode 100644 include/linux/i2c/apds990x.h create mode 100644 include/linux/platform_data/apds990x.h diff --git a/drivers/misc/apds990x.c b/drivers/misc/apds990x.c index dfb72ecfa604..c341164edaad 100644 --- a/drivers/misc/apds990x.c +++ b/drivers/misc/apds990x.c @@ -32,7 +32,7 @@ #include #include #include -#include +#include /* Register map */ #define APDS990X_ENABLE 0x00 /* Enable of states and interrupts */ diff --git a/include/linux/i2c/apds990x.h b/include/linux/i2c/apds990x.h deleted file mode 100644 index d186fcc5d257..000000000000 --- a/include/linux/i2c/apds990x.h +++ /dev/null @@ -1,79 +0,0 @@ -/* - * This file is part of the APDS990x sensor driver. - * Chip is combined proximity and ambient light sensor. - * - * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). - * - * Contact: Samu Onkalo - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA - * 02110-1301 USA - * - */ - -#ifndef __APDS990X_H__ -#define __APDS990X_H__ - - -#define APDS_IRLED_CURR_12mA 0x3 -#define APDS_IRLED_CURR_25mA 0x2 -#define APDS_IRLED_CURR_50mA 0x1 -#define APDS_IRLED_CURR_100mA 0x0 - -/** - * struct apds990x_chip_factors - defines effect of the cover window - * @ga: Total glass attenuation - * @cf1: clear channel factor 1 for raw to lux conversion - * @irf1: IR channel factor 1 for raw to lux conversion - * @cf2: clear channel factor 2 for raw to lux conversion - * @irf2: IR channel factor 2 for raw to lux conversion - * @df: device factor for conversion formulas - * - * Structure for tuning ALS calculation to match with environment. - * Values depend on the material above the sensor and the sensor - * itself. If the GA is zero, driver will use uncovered sensor default values - * format: decimal value * APDS_PARAM_SCALE except df which is plain integer. - */ -#define APDS_PARAM_SCALE 4096 -struct apds990x_chip_factors { - int ga; - int cf1; - int irf1; - int cf2; - int irf2; - int df; -}; - -/** - * struct apds990x_platform_data - platform data for apsd990x.c driver - * @cf: chip factor data - * @pddrive: IR-led driving current - * @ppcount: number of IR pulses used for proximity estimation - * @setup_resources: interrupt line setup call back function - * @release_resources: interrupt line release call back function - * - * Proximity detection result depends heavily on correct ppcount, pdrive - * and cover window. - * - */ - -struct apds990x_platform_data { - struct apds990x_chip_factors cf; - u8 pdrive; - u8 ppcount; - int (*setup_resources)(void); - int (*release_resources)(void); -}; - -#endif diff --git a/include/linux/platform_data/apds990x.h b/include/linux/platform_data/apds990x.h new file mode 100644 index 000000000000..d186fcc5d257 --- /dev/null +++ b/include/linux/platform_data/apds990x.h @@ -0,0 +1,79 @@ +/* + * This file is part of the APDS990x sensor driver. + * Chip is combined proximity and ambient light sensor. + * + * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). + * + * Contact: Samu Onkalo + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#ifndef __APDS990X_H__ +#define __APDS990X_H__ + + +#define APDS_IRLED_CURR_12mA 0x3 +#define APDS_IRLED_CURR_25mA 0x2 +#define APDS_IRLED_CURR_50mA 0x1 +#define APDS_IRLED_CURR_100mA 0x0 + +/** + * struct apds990x_chip_factors - defines effect of the cover window + * @ga: Total glass attenuation + * @cf1: clear channel factor 1 for raw to lux conversion + * @irf1: IR channel factor 1 for raw to lux conversion + * @cf2: clear channel factor 2 for raw to lux conversion + * @irf2: IR channel factor 2 for raw to lux conversion + * @df: device factor for conversion formulas + * + * Structure for tuning ALS calculation to match with environment. + * Values depend on the material above the sensor and the sensor + * itself. If the GA is zero, driver will use uncovered sensor default values + * format: decimal value * APDS_PARAM_SCALE except df which is plain integer. + */ +#define APDS_PARAM_SCALE 4096 +struct apds990x_chip_factors { + int ga; + int cf1; + int irf1; + int cf2; + int irf2; + int df; +}; + +/** + * struct apds990x_platform_data - platform data for apsd990x.c driver + * @cf: chip factor data + * @pddrive: IR-led driving current + * @ppcount: number of IR pulses used for proximity estimation + * @setup_resources: interrupt line setup call back function + * @release_resources: interrupt line release call back function + * + * Proximity detection result depends heavily on correct ppcount, pdrive + * and cover window. + * + */ + +struct apds990x_platform_data { + struct apds990x_chip_factors cf; + u8 pdrive; + u8 ppcount; + int (*setup_resources)(void); + int (*release_resources)(void); +}; + +#endif -- cgit v1.2.3 From 7ae5f10a9fc1ae2f001ab3be5be84a5d0a89f918 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Sun, 21 May 2017 22:42:33 +0200 Subject: misc: bh1770glc: move header file out of I2C realm include/linux/i2c is not for client devices. Move the header file to a more appropriate location. Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/misc/bh1770glc.c | 2 +- include/linux/i2c/bh1770glc.h | 53 --------------------------------- include/linux/platform_data/bh1770glc.h | 53 +++++++++++++++++++++++++++++++++ 3 files changed, 54 insertions(+), 54 deletions(-) delete mode 100644 include/linux/i2c/bh1770glc.h create mode 100644 include/linux/platform_data/bh1770glc.h diff --git a/drivers/misc/bh1770glc.c b/drivers/misc/bh1770glc.c index 845466e45b95..38fcfe219d1c 100644 --- a/drivers/misc/bh1770glc.c +++ b/drivers/misc/bh1770glc.c @@ -27,7 +27,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/include/linux/i2c/bh1770glc.h b/include/linux/i2c/bh1770glc.h deleted file mode 100644 index 8b5e2df36c72..000000000000 --- a/include/linux/i2c/bh1770glc.h +++ /dev/null @@ -1,53 +0,0 @@ -/* - * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver. - * Chip is combined proximity and ambient light sensor. - * - * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). - * - * Contact: Samu Onkalo - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA - * 02110-1301 USA - * - */ - -#ifndef __BH1770_H__ -#define __BH1770_H__ - -/** - * struct bh1770_platform_data - platform data for bh1770glc driver - * @led_def_curr: IR led driving current. - * @glass_attenuation: Attenuation factor for covering window. - * @setup_resources: Call back for interrupt line setup function - * @release_resources: Call back for interrupte line release function - * - * Example of glass attenuation: 16384 * 385 / 100 means attenuation factor - * of 3.85. i.e. light_above_sensor = light_above_cover_window / 3.85 - */ - -struct bh1770_platform_data { -#define BH1770_LED_5mA 0 -#define BH1770_LED_10mA 1 -#define BH1770_LED_20mA 2 -#define BH1770_LED_50mA 3 -#define BH1770_LED_100mA 4 -#define BH1770_LED_150mA 5 -#define BH1770_LED_200mA 6 - __u8 led_def_curr; -#define BH1770_NEUTRAL_GA 16384 /* 16384 / 16384 = 1 */ - __u32 glass_attenuation; - int (*setup_resources)(void); - int (*release_resources)(void); -}; -#endif diff --git a/include/linux/platform_data/bh1770glc.h b/include/linux/platform_data/bh1770glc.h new file mode 100644 index 000000000000..8b5e2df36c72 --- /dev/null +++ b/include/linux/platform_data/bh1770glc.h @@ -0,0 +1,53 @@ +/* + * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver. + * Chip is combined proximity and ambient light sensor. + * + * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). + * + * Contact: Samu Onkalo + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#ifndef __BH1770_H__ +#define __BH1770_H__ + +/** + * struct bh1770_platform_data - platform data for bh1770glc driver + * @led_def_curr: IR led driving current. + * @glass_attenuation: Attenuation factor for covering window. + * @setup_resources: Call back for interrupt line setup function + * @release_resources: Call back for interrupte line release function + * + * Example of glass attenuation: 16384 * 385 / 100 means attenuation factor + * of 3.85. i.e. light_above_sensor = light_above_cover_window / 3.85 + */ + +struct bh1770_platform_data { +#define BH1770_LED_5mA 0 +#define BH1770_LED_10mA 1 +#define BH1770_LED_20mA 2 +#define BH1770_LED_50mA 3 +#define BH1770_LED_100mA 4 +#define BH1770_LED_150mA 5 +#define BH1770_LED_200mA 6 + __u8 led_def_curr; +#define BH1770_NEUTRAL_GA 16384 /* 16384 / 16384 = 1 */ + __u32 glass_attenuation; + int (*setup_resources)(void); + int (*release_resources)(void); +}; +#endif -- cgit v1.2.3 From 46505c802a55189955d97195c8567ee263168747 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 26 May 2017 13:57:49 -0700 Subject: Revert "firmware: vpd: remove platform driver" This reverts commit 7975bd4cca05a99aa14964cfa22366ee64da50ad, because VPD relies on driver core to handle deferrals returned by coreboot_table_find(). Signed-off-by: Dmitry Torokhov Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/vpd.c | 44 +++++++++++++++++++++++++++---------------- 1 file changed, 28 insertions(+), 16 deletions(-) diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c index d28f62fed50f..4f8f99edbbfa 100644 --- a/drivers/firmware/google/vpd.c +++ b/drivers/firmware/google/vpd.c @@ -22,6 +22,8 @@ #include #include #include +#include +#include #include #include @@ -277,37 +279,47 @@ static int vpd_sections_init(phys_addr_t physaddr) ret = vpd_section_init("rw", &rw_vpd, physaddr + sizeof(struct vpd_cbmem) + header.ro_size, header.rw_size); - if (ret) { - vpd_section_destroy(&ro_vpd); + if (ret) return ret; - } } return 0; } -static int __init vpd_platform_init(void) +static int vpd_probe(struct platform_device *pdev) { + int ret; struct lb_cbmem_ref entry; - int err; + + ret = coreboot_table_find(CB_TAG_VPD, &entry, sizeof(entry)); + if (ret) + return ret; + + return vpd_sections_init(entry.cbmem_addr); +} + +static struct platform_driver vpd_driver = { + .probe = vpd_probe, + .driver = { + .name = "vpd", + }, +}; + +static int __init vpd_platform_init(void) +{ + struct platform_device *pdev; + + pdev = platform_device_register_simple("vpd", -1, NULL, 0); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); vpd_kobj = kobject_create_and_add("vpd", firmware_kobj); if (!vpd_kobj) return -ENOMEM; - err = coreboot_table_find(CB_TAG_VPD, &entry, sizeof(entry)); - if (err) - goto err_kobject_put; - - err = vpd_sections_init(entry.cbmem_addr); - if (err) - goto err_kobject_put; + platform_driver_register(&vpd_driver); return 0; - -err_kobject_put: - kobject_put(vpd_kobj); - return err; } static void __exit vpd_platform_exit(void) -- cgit v1.2.3 From 57102ad79284facacc7a94879cf3e11452557da3 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:31 +0530 Subject: spmi: pmic_arb: block access of invalid read and writes The system crashes due to bad access when reading from an non configured peripheral and when writing to peripheral which is not owned by current ee. This patch verifies ownership to avoid crashing on write. For reads, since the forward mapping table, data_channel->ppid, is towards the end of the block, we use the core size to figure the max number of ppids supported. The table starts at an offset of 0x800 within the block, so size - 0x800 will give us the area used by the table. Since each table is 4 bytes long (core_size - 0x800) / 4 will gives us the number of data_channel supported. This new protection is functional on hw v2. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 84 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 1 deletion(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 5ec3a595dc7d..df463d484350 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -111,6 +111,7 @@ struct pmic_arb_ver_ops; * @ee: the current Execution Environment * @min_apid: minimum APID (used for bounding IRQ search) * @max_apid: maximum APID + * @max_periph: maximum number of PMIC peripherals supported by HW. * @mapping_table: in-memory copy of PPID -> APID mapping table. * @domain: irq domain object for PMIC IRQ domain * @spmic: SPMI controller object @@ -132,6 +133,7 @@ struct spmi_pmic_arb_dev { u8 ee; u16 min_apid; u16 max_apid; + u16 max_periph; u32 *mapping_table; DECLARE_BITMAP(mapping_table_valid, PMIC_ARB_MAX_PERIPHS); struct irq_domain *domain; @@ -140,11 +142,13 @@ struct spmi_pmic_arb_dev { const struct pmic_arb_ver_ops *ver_ops; u16 *ppid_to_chan; u16 last_channel; + u8 *chan_to_owner; }; /** * pmic_arb_ver: version dependent functionality. * + * @mode: access rights to specified pmic peripheral. * @non_data_cmd: on v1 issues an spmi non-data command. * on v2 no HW support, returns -EOPNOTSUPP. * @offset: on v1 offset of per-ee channel. @@ -160,6 +164,8 @@ struct spmi_pmic_arb_dev { * on v2 offset of SPMI_PIC_IRQ_CLEARn. */ struct pmic_arb_ver_ops { + int (*mode)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr, + mode_t *mode); /* spmi commands (read_cmd, write_cmd, cmd) functionality */ int (*offset)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr, u32 *offset); @@ -313,11 +319,23 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, u32 cmd; int rc; u32 offset; + mode_t mode; rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset); if (rc) return rc; + rc = pmic_arb->ver_ops->mode(pmic_arb, sid, addr, &mode); + if (rc) + return rc; + + if (!(mode & S_IRUSR)) { + dev_err(&pmic_arb->spmic->dev, + "error: impermissible read from peripheral sid:%d addr:0x%x\n", + sid, addr); + return -EPERM; + } + if (bc >= PMIC_ARB_MAX_TRANS_BYTES) { dev_err(&ctrl->dev, "pmic-arb supports 1..%d bytes per trans, but:%zu requested", @@ -364,11 +382,23 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, u32 cmd; int rc; u32 offset; + mode_t mode; rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset); if (rc) return rc; + rc = pmic_arb->ver_ops->mode(pmic_arb, sid, addr, &mode); + if (rc) + return rc; + + if (!(mode & S_IWUSR)) { + dev_err(&pmic_arb->spmic->dev, + "error: impermissible write to peripheral sid:%d addr:0x%x\n", + sid, addr); + return -EPERM; + } + if (bc >= PMIC_ARB_MAX_TRANS_BYTES) { dev_err(&ctrl->dev, "pmic-arb supports 1..%d bytes per trans, but:%zu requested", @@ -727,6 +757,13 @@ static int qpnpint_irq_domain_map(struct irq_domain *d, return 0; } +static int +pmic_arb_mode_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, mode_t *mode) +{ + *mode = S_IRUSR | S_IWUSR; + return 0; +} + /* v1 offset per ee */ static int pmic_arb_offset_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, u32 *offset) @@ -745,7 +782,11 @@ static u16 pmic_arb_find_chan(struct spmi_pmic_arb_dev *pa, u16 ppid) * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid. * ppid_to_chan is an in-memory invert of that table. */ - for (chan = pa->last_channel; ; chan++) { + for (chan = pa->last_channel; chan < pa->max_periph; chan++) { + regval = readl_relaxed(pa->cnfg + + SPMI_OWNERSHIP_TABLE_REG(chan)); + pa->chan_to_owner[chan] = SPMI_OWNERSHIP_PERIPH2OWNER(regval); + offset = PMIC_ARB_REG_CHNL(chan); if (offset >= pa->core_size) break; @@ -767,6 +808,27 @@ static u16 pmic_arb_find_chan(struct spmi_pmic_arb_dev *pa, u16 ppid) } +static int +pmic_arb_mode_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, mode_t *mode) +{ + u16 ppid = (sid << 8) | (addr >> 8); + u16 chan; + u8 owner; + + chan = pa->ppid_to_chan[ppid]; + if (!(chan & PMIC_ARB_CHAN_VALID)) + return -ENODEV; + + *mode = 0; + *mode |= S_IRUSR; + + chan &= ~PMIC_ARB_CHAN_VALID; + owner = pa->chan_to_owner[chan]; + if (owner == pa->ee) + *mode |= S_IWUSR; + return 0; +} + /* v2 offset per ppid (chan) and per ee */ static int pmic_arb_offset_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, u32 *offset) @@ -836,6 +898,7 @@ static u32 pmic_arb_irq_clear_v2(u8 n) } static const struct pmic_arb_ver_ops pmic_arb_v1 = { + .mode = pmic_arb_mode_v1, .non_data_cmd = pmic_arb_non_data_cmd_v1, .offset = pmic_arb_offset_v1, .fmt_cmd = pmic_arb_fmt_cmd_v1, @@ -846,6 +909,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v1 = { }; static const struct pmic_arb_ver_ops pmic_arb_v2 = { + .mode = pmic_arb_mode_v2, .non_data_cmd = pmic_arb_non_data_cmd_v2, .offset = pmic_arb_offset_v2, .fmt_cmd = pmic_arb_fmt_cmd_v2, @@ -879,6 +943,12 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core"); pa->core_size = resource_size(res); + if (pa->core_size <= 0x800) { + dev_err(&pdev->dev, "core_size is smaller than 0x800. Failing Probe\n"); + err = -EINVAL; + goto err_put_ctrl; + } + core = devm_ioremap_resource(&ctrl->dev, res); if (IS_ERR(core)) { err = PTR_ERR(core); @@ -899,6 +969,9 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) pa->core = core; pa->ver_ops = &pmic_arb_v2; + /* the apid to ppid table starts at PMIC_ARB_REG_CHNL(0) */ + pa->max_periph = (pa->core_size - PMIC_ARB_REG_CHNL(0)) / 4; + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "obsrvr"); pa->rd_base = devm_ioremap_resource(&ctrl->dev, res); @@ -923,6 +996,15 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) err = -ENOMEM; goto err_put_ctrl; } + + pa->chan_to_owner = devm_kcalloc(&ctrl->dev, + pa->max_periph, + sizeof(*pa->chan_to_owner), + GFP_KERNEL); + if (!pa->chan_to_owner) { + err = -ENOMEM; + goto err_put_ctrl; + } } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr"); -- cgit v1.2.3 From 111a10bf3e53aeda5f14297a4c2dbacf3023de45 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:32 +0530 Subject: spmi: pmic-arb: rename spmi_pmic_arb_dev to spmi_pmic_arb Usually *_dev best used for structures that embed a struct device in them. spmi_pmic_arb_dev doesn't embed one. It is simply a driver data structure. Use an appropriate name for it. Also there are many places in the driver that left shift the bit to generate a bit mask. Replace it with the BIT() macro. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 164 +++++++++++++++++++++---------------------- 1 file changed, 82 insertions(+), 82 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index df463d484350..7f918ea23573 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -58,10 +58,10 @@ /* Channel Status fields */ enum pmic_arb_chnl_status { - PMIC_ARB_STATUS_DONE = (1 << 0), - PMIC_ARB_STATUS_FAILURE = (1 << 1), - PMIC_ARB_STATUS_DENIED = (1 << 2), - PMIC_ARB_STATUS_DROPPED = (1 << 3), + PMIC_ARB_STATUS_DONE = BIT(0), + PMIC_ARB_STATUS_FAILURE = BIT(1), + PMIC_ARB_STATUS_DENIED = BIT(2), + PMIC_ARB_STATUS_DROPPED = BIT(3), }; /* Command register fields */ @@ -99,7 +99,7 @@ enum pmic_arb_cmd_op_code { struct pmic_arb_ver_ops; /** - * spmi_pmic_arb_dev - SPMI PMIC Arbiter object + * spmi_pmic_arb - SPMI PMIC Arbiter object * * @rd_base: on v1 "core", on v2 "observer" register base off DT. * @wr_base: on v1 "core", on v2 "chnls" register base off DT. @@ -120,7 +120,7 @@ struct pmic_arb_ver_ops; * @ppid_to_chan in-memory copy of PPID -> channel (APID) mapping table. * v2 only. */ -struct spmi_pmic_arb_dev { +struct spmi_pmic_arb { void __iomem *rd_base; void __iomem *wr_base; void __iomem *intr; @@ -164,10 +164,10 @@ struct spmi_pmic_arb_dev { * on v2 offset of SPMI_PIC_IRQ_CLEARn. */ struct pmic_arb_ver_ops { - int (*mode)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr, + int (*mode)(struct spmi_pmic_arb *dev, u8 sid, u16 addr, mode_t *mode); /* spmi commands (read_cmd, write_cmd, cmd) functionality */ - int (*offset)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr, + int (*offset)(struct spmi_pmic_arb *dev, u8 sid, u16 addr, u32 *offset); u32 (*fmt_cmd)(u8 opc, u8 sid, u16 addr, u8 bc); int (*non_data_cmd)(struct spmi_controller *ctrl, u8 opc, u8 sid); @@ -178,16 +178,16 @@ struct pmic_arb_ver_ops { u32 (*irq_clear)(u8 n); }; -static inline void pmic_arb_base_write(struct spmi_pmic_arb_dev *dev, +static inline void pmic_arb_base_write(struct spmi_pmic_arb *pa, u32 offset, u32 val) { - writel_relaxed(val, dev->wr_base + offset); + writel_relaxed(val, pa->wr_base + offset); } -static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb_dev *dev, +static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb *pa, u32 offset, u32 val) { - writel_relaxed(val, dev->rd_base + offset); + writel_relaxed(val, pa->rd_base + offset); } /** @@ -196,9 +196,10 @@ static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb_dev *dev, * @reg: register's address * @buf: output parameter, length must be bc + 1 */ -static void pa_read_data(struct spmi_pmic_arb_dev *dev, u8 *buf, u32 reg, u8 bc) +static void pa_read_data(struct spmi_pmic_arb *pa, u8 *buf, u32 reg, u8 bc) { - u32 data = __raw_readl(dev->rd_base + reg); + u32 data = __raw_readl(pa->rd_base + reg); + memcpy(buf, &data, (bc & 3) + 1); } @@ -209,23 +210,24 @@ static void pa_read_data(struct spmi_pmic_arb_dev *dev, u8 *buf, u32 reg, u8 bc) * @buf: buffer to write. length must be bc + 1. */ static void -pa_write_data(struct spmi_pmic_arb_dev *dev, const u8 *buf, u32 reg, u8 bc) +pa_write_data(struct spmi_pmic_arb *pa, const u8 *buf, u32 reg, u8 bc) { u32 data = 0; + memcpy(&data, buf, (bc & 3) + 1); - __raw_writel(data, dev->wr_base + reg); + pmic_arb_base_write(pa, reg, data); } static int pmic_arb_wait_for_done(struct spmi_controller *ctrl, void __iomem *base, u8 sid, u16 addr) { - struct spmi_pmic_arb_dev *dev = spmi_controller_get_drvdata(ctrl); + struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl); u32 status = 0; u32 timeout = PMIC_ARB_TIMEOUT_US; u32 offset; int rc; - rc = dev->ver_ops->offset(dev, sid, addr, &offset); + rc = pa->ver_ops->offset(pa, sid, addr, &offset); if (rc) return rc; @@ -270,22 +272,22 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl, static int pmic_arb_non_data_cmd_v1(struct spmi_controller *ctrl, u8 opc, u8 sid) { - struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl); + struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl); unsigned long flags; u32 cmd; int rc; u32 offset; - rc = pmic_arb->ver_ops->offset(pmic_arb, sid, 0, &offset); + rc = pa->ver_ops->offset(pa, sid, 0, &offset); if (rc) return rc; cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20); - raw_spin_lock_irqsave(&pmic_arb->lock, flags); - pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd); - rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0); - raw_spin_unlock_irqrestore(&pmic_arb->lock, flags); + raw_spin_lock_irqsave(&pa->lock, flags); + pmic_arb_base_write(pa, offset + PMIC_ARB_CMD, cmd); + rc = pmic_arb_wait_for_done(ctrl, pa->wr_base, sid, 0); + raw_spin_unlock_irqrestore(&pa->lock, flags); return rc; } @@ -299,7 +301,7 @@ pmic_arb_non_data_cmd_v2(struct spmi_controller *ctrl, u8 opc, u8 sid) /* Non-data command */ static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid) { - struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl); + struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl); dev_dbg(&ctrl->dev, "cmd op:0x%x sid:%d\n", opc, sid); @@ -307,13 +309,13 @@ static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid) if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP) return -EINVAL; - return pmic_arb->ver_ops->non_data_cmd(ctrl, opc, sid); + return pa->ver_ops->non_data_cmd(ctrl, opc, sid); } static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, u16 addr, u8 *buf, size_t len) { - struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl); + struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl); unsigned long flags; u8 bc = len - 1; u32 cmd; @@ -321,16 +323,16 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, u32 offset; mode_t mode; - rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset); + rc = pa->ver_ops->offset(pa, sid, addr, &offset); if (rc) return rc; - rc = pmic_arb->ver_ops->mode(pmic_arb, sid, addr, &mode); + rc = pa->ver_ops->mode(pa, sid, addr, &mode); if (rc) return rc; if (!(mode & S_IRUSR)) { - dev_err(&pmic_arb->spmic->dev, + dev_err(&pa->spmic->dev, "error: impermissible read from peripheral sid:%d addr:0x%x\n", sid, addr); return -EPERM; @@ -353,30 +355,29 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, else return -EINVAL; - cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc); + cmd = pa->ver_ops->fmt_cmd(opc, sid, addr, bc); - raw_spin_lock_irqsave(&pmic_arb->lock, flags); - pmic_arb_set_rd_cmd(pmic_arb, offset + PMIC_ARB_CMD, cmd); - rc = pmic_arb_wait_for_done(ctrl, pmic_arb->rd_base, sid, addr); + raw_spin_lock_irqsave(&pa->lock, flags); + pmic_arb_set_rd_cmd(pa, offset + PMIC_ARB_CMD, cmd); + rc = pmic_arb_wait_for_done(ctrl, pa->rd_base, sid, addr); if (rc) goto done; - pa_read_data(pmic_arb, buf, offset + PMIC_ARB_RDATA0, + pa_read_data(pa, buf, offset + PMIC_ARB_RDATA0, min_t(u8, bc, 3)); if (bc > 3) - pa_read_data(pmic_arb, buf + 4, - offset + PMIC_ARB_RDATA1, bc - 4); + pa_read_data(pa, buf + 4, offset + PMIC_ARB_RDATA1, bc - 4); done: - raw_spin_unlock_irqrestore(&pmic_arb->lock, flags); + raw_spin_unlock_irqrestore(&pa->lock, flags); return rc; } static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, u16 addr, const u8 *buf, size_t len) { - struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl); + struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl); unsigned long flags; u8 bc = len - 1; u32 cmd; @@ -384,16 +385,16 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, u32 offset; mode_t mode; - rc = pmic_arb->ver_ops->offset(pmic_arb, sid, addr, &offset); + rc = pa->ver_ops->offset(pa, sid, addr, &offset); if (rc) return rc; - rc = pmic_arb->ver_ops->mode(pmic_arb, sid, addr, &mode); + rc = pa->ver_ops->mode(pa, sid, addr, &mode); if (rc) return rc; if (!(mode & S_IWUSR)) { - dev_err(&pmic_arb->spmic->dev, + dev_err(&pa->spmic->dev, "error: impermissible write to peripheral sid:%d addr:0x%x\n", sid, addr); return -EPERM; @@ -418,20 +419,18 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid, else return -EINVAL; - cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc); + cmd = pa->ver_ops->fmt_cmd(opc, sid, addr, bc); /* Write data to FIFOs */ - raw_spin_lock_irqsave(&pmic_arb->lock, flags); - pa_write_data(pmic_arb, buf, offset + PMIC_ARB_WDATA0, - min_t(u8, bc, 3)); + raw_spin_lock_irqsave(&pa->lock, flags); + pa_write_data(pa, buf, offset + PMIC_ARB_WDATA0, min_t(u8, bc, 3)); if (bc > 3) - pa_write_data(pmic_arb, buf + 4, - offset + PMIC_ARB_WDATA1, bc - 4); + pa_write_data(pa, buf + 4, offset + PMIC_ARB_WDATA1, bc - 4); /* Start the transaction */ - pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd); - rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, addr); - raw_spin_unlock_irqrestore(&pmic_arb->lock, flags); + pmic_arb_base_write(pa, offset + PMIC_ARB_CMD, cmd); + rc = pmic_arb_wait_for_done(ctrl, pa->wr_base, sid, addr); + raw_spin_unlock_irqrestore(&pa->lock, flags); return rc; } @@ -457,7 +456,7 @@ struct spmi_pmic_arb_qpnpint_type { static void qpnpint_spmi_write(struct irq_data *d, u8 reg, void *buf, size_t len) { - struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d); + struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 sid = d->hwirq >> 24; u8 per = d->hwirq >> 16; @@ -470,7 +469,7 @@ static void qpnpint_spmi_write(struct irq_data *d, u8 reg, void *buf, static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len) { - struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d); + struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 sid = d->hwirq >> 24; u8 per = d->hwirq >> 16; @@ -481,7 +480,7 @@ static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len) d->irq); } -static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid) +static void periph_interrupt(struct spmi_pmic_arb *pa, u8 apid) { unsigned int irq; u32 status; @@ -490,7 +489,7 @@ static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid) status = readl_relaxed(pa->intr + pa->ver_ops->irq_status(apid)); while (status) { id = ffs(status) - 1; - status &= ~(1 << id); + status &= ~BIT(id); irq = irq_find_mapping(pa->domain, pa->apid_to_ppid[apid] << 16 | id << 8 @@ -501,7 +500,7 @@ static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid) static void pmic_arb_chained_irq(struct irq_desc *desc) { - struct spmi_pmic_arb_dev *pa = irq_desc_get_handler_data(desc); + struct spmi_pmic_arb *pa = irq_desc_get_handler_data(desc); struct irq_chip *chip = irq_desc_get_chip(desc); void __iomem *intr = pa->intr; int first = pa->min_apid >> 5; @@ -516,7 +515,7 @@ static void pmic_arb_chained_irq(struct irq_desc *desc) pa->ver_ops->owner_acc_status(pa->ee, i)); while (status) { id = ffs(status) - 1; - status &= ~(1 << id); + status &= ~BIT(id); periph_interrupt(pa, id + i * 32); } } @@ -526,23 +525,23 @@ static void pmic_arb_chained_irq(struct irq_desc *desc) static void qpnpint_irq_ack(struct irq_data *d) { - struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d); + struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; u8 apid = d->hwirq; unsigned long flags; u8 data; raw_spin_lock_irqsave(&pa->lock, flags); - writel_relaxed(1 << irq, pa->intr + pa->ver_ops->irq_clear(apid)); + writel_relaxed(BIT(irq), pa->intr + pa->ver_ops->irq_clear(apid)); raw_spin_unlock_irqrestore(&pa->lock, flags); - data = 1 << irq; + data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1); } static void qpnpint_irq_mask(struct irq_data *d) { - struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d); + struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; u8 apid = d->hwirq; unsigned long flags; @@ -558,13 +557,13 @@ static void qpnpint_irq_mask(struct irq_data *d) } raw_spin_unlock_irqrestore(&pa->lock, flags); - data = 1 << irq; + data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1); } static void qpnpint_irq_unmask(struct irq_data *d) { - struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d); + struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; u8 apid = d->hwirq; unsigned long flags; @@ -579,7 +578,7 @@ static void qpnpint_irq_unmask(struct irq_data *d) } raw_spin_unlock_irqrestore(&pa->lock, flags); - data = 1 << irq; + data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_EN_SET, &data, 1); } @@ -590,7 +589,7 @@ static void qpnpint_irq_enable(struct irq_data *d) qpnpint_irq_unmask(d); - data = 1 << irq; + data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1); } @@ -598,25 +597,26 @@ static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type) { struct spmi_pmic_arb_qpnpint_type type; u8 irq = d->hwirq >> 8; + u8 bit_mask_irq = BIT(irq); qpnpint_spmi_read(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type)); if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) { - type.type |= 1 << irq; + type.type |= bit_mask_irq; if (flow_type & IRQF_TRIGGER_RISING) - type.polarity_high |= 1 << irq; + type.polarity_high |= bit_mask_irq; if (flow_type & IRQF_TRIGGER_FALLING) - type.polarity_low |= 1 << irq; + type.polarity_low |= bit_mask_irq; } else { if ((flow_type & (IRQF_TRIGGER_HIGH)) && (flow_type & (IRQF_TRIGGER_LOW))) return -EINVAL; - type.type &= ~(1 << irq); /* level trig */ + type.type &= ~bit_mask_irq; /* level trig */ if (flow_type & IRQF_TRIGGER_HIGH) - type.polarity_high |= 1 << irq; + type.polarity_high |= bit_mask_irq; else - type.polarity_low |= 1 << irq; + type.polarity_low |= bit_mask_irq; } qpnpint_spmi_write(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type)); @@ -657,7 +657,7 @@ struct spmi_pmic_arb_irq_spec { unsigned irq:3; }; -static int search_mapping_table(struct spmi_pmic_arb_dev *pa, +static int search_mapping_table(struct spmi_pmic_arb *pa, struct spmi_pmic_arb_irq_spec *spec, u8 *apid) { @@ -673,7 +673,7 @@ static int search_mapping_table(struct spmi_pmic_arb_dev *pa, data = mapping_table[index]; - if (ppid & (1 << SPMI_MAPPING_BIT_INDEX(data))) { + if (ppid & BIT(SPMI_MAPPING_BIT_INDEX(data))) { if (SPMI_MAPPING_BIT_IS_1_FLAG(data)) { index = SPMI_MAPPING_BIT_IS_1_RESULT(data); } else { @@ -700,7 +700,7 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, unsigned long *out_hwirq, unsigned int *out_type) { - struct spmi_pmic_arb_dev *pa = d->host_data; + struct spmi_pmic_arb *pa = d->host_data; struct spmi_pmic_arb_irq_spec spec; int err; u8 apid; @@ -747,7 +747,7 @@ static int qpnpint_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hwirq) { - struct spmi_pmic_arb_dev *pa = d->host_data; + struct spmi_pmic_arb *pa = d->host_data; dev_dbg(&pa->spmic->dev, "virq = %u, hwirq = %lu\n", virq, hwirq); @@ -758,7 +758,7 @@ static int qpnpint_irq_domain_map(struct irq_domain *d, } static int -pmic_arb_mode_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, mode_t *mode) +pmic_arb_mode_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { *mode = S_IRUSR | S_IWUSR; return 0; @@ -766,13 +766,13 @@ pmic_arb_mode_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, mode_t *mode) /* v1 offset per ee */ static int -pmic_arb_offset_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, u32 *offset) +pmic_arb_offset_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset) { *offset = 0x800 + 0x80 * pa->channel; return 0; } -static u16 pmic_arb_find_chan(struct spmi_pmic_arb_dev *pa, u16 ppid) +static u16 pmic_arb_find_chan(struct spmi_pmic_arb *pa, u16 ppid) { u32 regval, offset; u16 chan; @@ -809,7 +809,7 @@ static u16 pmic_arb_find_chan(struct spmi_pmic_arb_dev *pa, u16 ppid) static int -pmic_arb_mode_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, mode_t *mode) +pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { u16 ppid = (sid << 8) | (addr >> 8); u16 chan; @@ -831,7 +831,7 @@ pmic_arb_mode_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, mode_t *mode) /* v2 offset per ppid (chan) and per ee */ static int -pmic_arb_offset_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr, u32 *offset) +pmic_arb_offset_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset) { u16 ppid = (sid << 8) | (addr >> 8); u16 chan; @@ -926,7 +926,7 @@ static const struct irq_domain_ops pmic_arb_irq_domain_ops = { static int spmi_pmic_arb_probe(struct platform_device *pdev) { - struct spmi_pmic_arb_dev *pa; + struct spmi_pmic_arb *pa; struct spmi_controller *ctrl; struct resource *res; void __iomem *core; @@ -1111,7 +1111,7 @@ err_put_ctrl: static int spmi_pmic_arb_remove(struct platform_device *pdev) { struct spmi_controller *ctrl = platform_get_drvdata(pdev); - struct spmi_pmic_arb_dev *pa = spmi_controller_get_drvdata(ctrl); + struct spmi_pmic_arb *pa = spmi_controller_get_drvdata(ctrl); spmi_controller_remove(ctrl); irq_set_chained_handler_and_data(pa->irq, NULL, NULL); irq_domain_remove(pa->domain); -- cgit v1.2.3 From 1ef1ce4e9ddd6dedd80f64ef112a3bd87ab50530 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:33 +0530 Subject: spmi: pmic-arb: fix inconsistent use of apid and chan The driver currently uses "apid" and "chan" to mean apid. Remove the use of chan and use only apid. On a SPMI bus there is allocation to manage up to 4K peripherals. However, in practice only few peripherals are instantiated and only few among the instantiated ones actually interrupt. APID is CPU's way of keeping track of peripherals that could interrupt. There is a table that maps the 256 interrupting peripherals to a number between 0 and 255. This number is called APID. Information about that interrupting peripheral is stored in registers offset by its corresponding apid. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 68 ++++++++++++++++++++++---------------------- 1 file changed, 34 insertions(+), 34 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 7f918ea23573..72016116d861 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -117,7 +117,7 @@ struct pmic_arb_ver_ops; * @spmic: SPMI controller object * @apid_to_ppid: in-memory copy of APID -> PPID mapping table. * @ver_ops: version dependent operations. - * @ppid_to_chan in-memory copy of PPID -> channel (APID) mapping table. + * @ppid_to_apid in-memory copy of PPID -> channel (APID) mapping table. * v2 only. */ struct spmi_pmic_arb { @@ -140,9 +140,9 @@ struct spmi_pmic_arb { struct spmi_controller *spmic; u16 *apid_to_ppid; const struct pmic_arb_ver_ops *ver_ops; - u16 *ppid_to_chan; - u16 last_channel; - u8 *chan_to_owner; + u16 *ppid_to_apid; + u16 last_apid; + u8 *apid_to_owner; }; /** @@ -772,22 +772,22 @@ pmic_arb_offset_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset) return 0; } -static u16 pmic_arb_find_chan(struct spmi_pmic_arb *pa, u16 ppid) +static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid) { u32 regval, offset; - u16 chan; + u16 apid; u16 id; /* * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid. - * ppid_to_chan is an in-memory invert of that table. + * ppid_to_apid is an in-memory invert of that table. */ - for (chan = pa->last_channel; chan < pa->max_periph; chan++) { + for (apid = pa->last_apid; apid < pa->max_periph; apid++) { regval = readl_relaxed(pa->cnfg + - SPMI_OWNERSHIP_TABLE_REG(chan)); - pa->chan_to_owner[chan] = SPMI_OWNERSHIP_PERIPH2OWNER(regval); + SPMI_OWNERSHIP_TABLE_REG(apid)); + pa->apid_to_owner[apid] = SPMI_OWNERSHIP_PERIPH2OWNER(regval); - offset = PMIC_ARB_REG_CHNL(chan); + offset = PMIC_ARB_REG_CHNL(apid); if (offset >= pa->core_size) break; @@ -796,15 +796,15 @@ static u16 pmic_arb_find_chan(struct spmi_pmic_arb *pa, u16 ppid) continue; id = (regval >> 8) & PMIC_ARB_PPID_MASK; - pa->ppid_to_chan[id] = chan | PMIC_ARB_CHAN_VALID; + pa->ppid_to_apid[id] = apid | PMIC_ARB_CHAN_VALID; if (id == ppid) { - chan |= PMIC_ARB_CHAN_VALID; + apid |= PMIC_ARB_CHAN_VALID; break; } } - pa->last_channel = chan & ~PMIC_ARB_CHAN_VALID; + pa->last_apid = apid & ~PMIC_ARB_CHAN_VALID; - return chan; + return apid; } @@ -812,38 +812,38 @@ static int pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { u16 ppid = (sid << 8) | (addr >> 8); - u16 chan; + u16 apid; u8 owner; - chan = pa->ppid_to_chan[ppid]; - if (!(chan & PMIC_ARB_CHAN_VALID)) + apid = pa->ppid_to_apid[ppid]; + if (!(apid & PMIC_ARB_CHAN_VALID)) return -ENODEV; *mode = 0; *mode |= S_IRUSR; - chan &= ~PMIC_ARB_CHAN_VALID; - owner = pa->chan_to_owner[chan]; + apid &= ~PMIC_ARB_CHAN_VALID; + owner = pa->apid_to_owner[apid]; if (owner == pa->ee) *mode |= S_IWUSR; return 0; } -/* v2 offset per ppid (chan) and per ee */ +/* v2 offset per ppid and per ee */ static int pmic_arb_offset_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset) { u16 ppid = (sid << 8) | (addr >> 8); - u16 chan; + u16 apid; - chan = pa->ppid_to_chan[ppid]; - if (!(chan & PMIC_ARB_CHAN_VALID)) - chan = pmic_arb_find_chan(pa, ppid); - if (!(chan & PMIC_ARB_CHAN_VALID)) + apid = pa->ppid_to_apid[ppid]; + if (!(apid & PMIC_ARB_CHAN_VALID)) + apid = pmic_arb_find_apid(pa, ppid); + if (!(apid & PMIC_ARB_CHAN_VALID)) return -ENODEV; - chan &= ~PMIC_ARB_CHAN_VALID; + apid &= ~PMIC_ARB_CHAN_VALID; - *offset = 0x1000 * pa->ee + 0x8000 * chan; + *offset = 0x1000 * pa->ee + 0x8000 * apid; return 0; } @@ -988,20 +988,20 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) goto err_put_ctrl; } - pa->ppid_to_chan = devm_kcalloc(&ctrl->dev, + pa->ppid_to_apid = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PPID, - sizeof(*pa->ppid_to_chan), + sizeof(*pa->ppid_to_apid), GFP_KERNEL); - if (!pa->ppid_to_chan) { + if (!pa->ppid_to_apid) { err = -ENOMEM; goto err_put_ctrl; } - pa->chan_to_owner = devm_kcalloc(&ctrl->dev, + pa->apid_to_owner = devm_kcalloc(&ctrl->dev, pa->max_periph, - sizeof(*pa->chan_to_owner), + sizeof(*pa->apid_to_owner), GFP_KERNEL); - if (!pa->chan_to_owner) { + if (!pa->apid_to_owner) { err = -ENOMEM; goto err_put_ctrl; } -- cgit v1.2.3 From 7f1d4e58dabb2668dd89547619ae4138996a8e26 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:34 +0530 Subject: spmi: pmic-arb: optimize table lookups The current driver uses a mix of radix tree and a fwd lookup table to translate between apid and ppid. It is buggy and confusing. Instead simply use a radix tree for v1 hardware and use the forward lookup table for v2. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 144 ++++++++++++++++++++++++++----------------- 1 file changed, 88 insertions(+), 56 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 72016116d861..6320f1f0ea5a 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -164,6 +164,8 @@ struct spmi_pmic_arb { * on v2 offset of SPMI_PIC_IRQ_CLEARn. */ struct pmic_arb_ver_ops { + int (*ppid_to_apid)(struct spmi_pmic_arb *pa, u8 sid, u16 addr, + u8 *apid); int (*mode)(struct spmi_pmic_arb *dev, u8 sid, u16 addr, mode_t *mode); /* spmi commands (read_cmd, write_cmd, cmd) functionality */ @@ -657,42 +659,6 @@ struct spmi_pmic_arb_irq_spec { unsigned irq:3; }; -static int search_mapping_table(struct spmi_pmic_arb *pa, - struct spmi_pmic_arb_irq_spec *spec, - u8 *apid) -{ - u16 ppid = spec->slave << 8 | spec->per; - u32 *mapping_table = pa->mapping_table; - int index = 0, i; - u32 data; - - for (i = 0; i < SPMI_MAPPING_TABLE_TREE_DEPTH; ++i) { - if (!test_and_set_bit(index, pa->mapping_table_valid)) - mapping_table[index] = readl_relaxed(pa->cnfg + - SPMI_MAPPING_TABLE_REG(index)); - - data = mapping_table[index]; - - if (ppid & BIT(SPMI_MAPPING_BIT_INDEX(data))) { - if (SPMI_MAPPING_BIT_IS_1_FLAG(data)) { - index = SPMI_MAPPING_BIT_IS_1_RESULT(data); - } else { - *apid = SPMI_MAPPING_BIT_IS_1_RESULT(data); - return 0; - } - } else { - if (SPMI_MAPPING_BIT_IS_0_FLAG(data)) { - index = SPMI_MAPPING_BIT_IS_0_RESULT(data); - } else { - *apid = SPMI_MAPPING_BIT_IS_0_RESULT(data); - return 0; - } - } - } - - return -ENODEV; -} - static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, struct device_node *controller, const u32 *intspec, @@ -702,7 +668,7 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, { struct spmi_pmic_arb *pa = d->host_data; struct spmi_pmic_arb_irq_spec spec; - int err; + int rc; u8 apid; dev_dbg(&pa->spmic->dev, @@ -720,11 +686,14 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, spec.per = intspec[1]; spec.irq = intspec[2]; - err = search_mapping_table(pa, &spec, &apid); - if (err) - return err; - - pa->apid_to_ppid[apid] = spec.slave << 8 | spec.per; + rc = pa->ver_ops->ppid_to_apid(pa, intspec[0], + (intspec[1] << 8), &apid); + if (rc < 0) { + dev_err(&pa->spmic->dev, + "failed to xlate sid = 0x%x, periph = 0x%x, irq = %x rc = %d\n", + intspec[0], intspec[1], intspec[2], rc); + return rc; + } /* Keep track of {max,min}_apid for bounding search during interrupt */ if (apid > pa->max_apid) @@ -757,6 +726,54 @@ static int qpnpint_irq_domain_map(struct irq_domain *d, return 0; } +static int +pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) +{ + u16 ppid = sid << 8 | ((addr >> 8) & 0xFF); + u32 *mapping_table = pa->mapping_table; + int index = 0, i; + u16 apid_valid; + u32 data; + + apid_valid = pa->ppid_to_apid[ppid]; + if (apid_valid & PMIC_ARB_CHAN_VALID) { + *apid = (apid_valid & ~PMIC_ARB_CHAN_VALID); + return 0; + } + + for (i = 0; i < SPMI_MAPPING_TABLE_TREE_DEPTH; ++i) { + if (!test_and_set_bit(index, pa->mapping_table_valid)) + mapping_table[index] = readl_relaxed(pa->cnfg + + SPMI_MAPPING_TABLE_REG(index)); + + data = mapping_table[index]; + + if (ppid & BIT(SPMI_MAPPING_BIT_INDEX(data))) { + if (SPMI_MAPPING_BIT_IS_1_FLAG(data)) { + index = SPMI_MAPPING_BIT_IS_1_RESULT(data); + } else { + *apid = SPMI_MAPPING_BIT_IS_1_RESULT(data); + pa->ppid_to_apid[ppid] + = *apid | PMIC_ARB_CHAN_VALID; + pa->apid_to_ppid[*apid] = ppid; + return 0; + } + } else { + if (SPMI_MAPPING_BIT_IS_0_FLAG(data)) { + index = SPMI_MAPPING_BIT_IS_0_RESULT(data); + } else { + *apid = SPMI_MAPPING_BIT_IS_0_RESULT(data); + pa->ppid_to_apid[ppid] + = *apid | PMIC_ARB_CHAN_VALID; + pa->apid_to_ppid[*apid] = ppid; + return 0; + } + } + } + + return -ENODEV; +} + static int pmic_arb_mode_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { @@ -797,6 +814,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid) id = (regval >> 8) & PMIC_ARB_PPID_MASK; pa->ppid_to_apid[id] = apid | PMIC_ARB_CHAN_VALID; + pa->apid_to_ppid[apid] = id; if (id == ppid) { apid |= PMIC_ARB_CHAN_VALID; break; @@ -809,20 +827,35 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid) static int -pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) +pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) { u16 ppid = (sid << 8) | (addr >> 8); - u16 apid; - u8 owner; + u16 apid_valid; - apid = pa->ppid_to_apid[ppid]; - if (!(apid & PMIC_ARB_CHAN_VALID)) + apid_valid = pa->ppid_to_apid[ppid]; + if (!(apid_valid & PMIC_ARB_CHAN_VALID)) + apid_valid = pmic_arb_find_apid(pa, ppid); + if (!(apid_valid & PMIC_ARB_CHAN_VALID)) return -ENODEV; + *apid = (apid_valid & ~PMIC_ARB_CHAN_VALID); + return 0; +} + +static int +pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) +{ + u8 apid; + u8 owner; + int rc; + + rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid); + if (rc < 0) + return rc; + *mode = 0; *mode |= S_IRUSR; - apid &= ~PMIC_ARB_CHAN_VALID; owner = pa->apid_to_owner[apid]; if (owner == pa->ee) *mode |= S_IWUSR; @@ -833,15 +866,12 @@ pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) static int pmic_arb_offset_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset) { - u16 ppid = (sid << 8) | (addr >> 8); - u16 apid; + u8 apid; + int rc; - apid = pa->ppid_to_apid[ppid]; - if (!(apid & PMIC_ARB_CHAN_VALID)) - apid = pmic_arb_find_apid(pa, ppid); - if (!(apid & PMIC_ARB_CHAN_VALID)) - return -ENODEV; - apid &= ~PMIC_ARB_CHAN_VALID; + rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid); + if (rc < 0) + return rc; *offset = 0x1000 * pa->ee + 0x8000 * apid; return 0; @@ -898,6 +928,7 @@ static u32 pmic_arb_irq_clear_v2(u8 n) } static const struct pmic_arb_ver_ops pmic_arb_v1 = { + .ppid_to_apid = pmic_arb_ppid_to_apid_v1, .mode = pmic_arb_mode_v1, .non_data_cmd = pmic_arb_non_data_cmd_v1, .offset = pmic_arb_offset_v1, @@ -909,6 +940,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v1 = { }; static const struct pmic_arb_ver_ops pmic_arb_v2 = { + .ppid_to_apid = pmic_arb_ppid_to_apid_v2, .mode = pmic_arb_mode_v2, .non_data_cmd = pmic_arb_non_data_cmd_v2, .offset = pmic_arb_offset_v2, -- cgit v1.2.3 From 6bc546e71e50b8dd49130033f066676504c29b0c Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:35 +0530 Subject: spmi: pmic-arb: cleanup unrequested irqs We see a unmapped irqs trigger right around bootup. This could likely be because the bootloader exited leaving the interrupts in an unknown or unhandled state. Ack and mask the interrupt if one is found. A request_irq later will unmask it and also setup proper mapping structures. Also the current driver ensures that no read/write transaction is in progress while it makes changes to the interrupt regions. This is not necessary because read/writes over spmi and arbiter interrupt control are independent operations. Hence, remove the synchronized accesses to interrupt region. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 101 ++++++++++++++++++------------------------- 1 file changed, 43 insertions(+), 58 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 6320f1f0ea5a..0a5728cab184 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -98,6 +98,11 @@ enum pmic_arb_cmd_op_code { struct pmic_arb_ver_ops; +struct apid_data { + u16 ppid; + u8 owner; +}; + /** * spmi_pmic_arb - SPMI PMIC Arbiter object * @@ -115,7 +120,6 @@ struct pmic_arb_ver_ops; * @mapping_table: in-memory copy of PPID -> APID mapping table. * @domain: irq domain object for PMIC IRQ domain * @spmic: SPMI controller object - * @apid_to_ppid: in-memory copy of APID -> PPID mapping table. * @ver_ops: version dependent operations. * @ppid_to_apid in-memory copy of PPID -> channel (APID) mapping table. * v2 only. @@ -138,11 +142,10 @@ struct spmi_pmic_arb { DECLARE_BITMAP(mapping_table_valid, PMIC_ARB_MAX_PERIPHS); struct irq_domain *domain; struct spmi_controller *spmic; - u16 *apid_to_ppid; const struct pmic_arb_ver_ops *ver_ops; u16 *ppid_to_apid; u16 last_apid; - u8 *apid_to_owner; + struct apid_data apid_data[PMIC_ARB_MAX_PERIPHS]; }; /** @@ -482,6 +485,28 @@ static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len) d->irq); } +static void cleanup_irq(struct spmi_pmic_arb *pa, u8 apid, int id) +{ + u16 ppid = pa->apid_data[apid].ppid; + u8 sid = ppid >> 8; + u8 per = ppid & 0xFF; + u8 irq_mask = BIT(id); + + writel_relaxed(irq_mask, pa->intr + pa->ver_ops->irq_clear(apid)); + + if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid, + (per << 8) + QPNPINT_REG_LATCHED_CLR, &irq_mask, 1)) + dev_err_ratelimited(&pa->spmic->dev, + "failed to ack irq_mask = 0x%x for ppid = %x\n", + irq_mask, ppid); + + if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid, + (per << 8) + QPNPINT_REG_EN_CLR, &irq_mask, 1)) + dev_err_ratelimited(&pa->spmic->dev, + "failed to ack irq_mask = 0x%x for ppid = %x\n", + irq_mask, ppid); +} + static void periph_interrupt(struct spmi_pmic_arb *pa, u8 apid) { unsigned int irq; @@ -493,9 +518,13 @@ static void periph_interrupt(struct spmi_pmic_arb *pa, u8 apid) id = ffs(status) - 1; status &= ~BIT(id); irq = irq_find_mapping(pa->domain, - pa->apid_to_ppid[apid] << 16 + pa->apid_data[apid].ppid << 16 | id << 8 | apid); + if (irq == 0) { + cleanup_irq(pa, apid, id); + continue; + } generic_handle_irq(irq); } } @@ -530,12 +559,9 @@ static void qpnpint_irq_ack(struct irq_data *d) struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; u8 apid = d->hwirq; - unsigned long flags; u8 data; - raw_spin_lock_irqsave(&pa->lock, flags); writel_relaxed(BIT(irq), pa->intr + pa->ver_ops->irq_clear(apid)); - raw_spin_unlock_irqrestore(&pa->lock, flags); data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1); @@ -543,23 +569,9 @@ static void qpnpint_irq_ack(struct irq_data *d) static void qpnpint_irq_mask(struct irq_data *d) { - struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; - u8 apid = d->hwirq; - unsigned long flags; - u32 status; - u8 data; + u8 data = BIT(irq); - raw_spin_lock_irqsave(&pa->lock, flags); - status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid)); - if (status & SPMI_PIC_ACC_ENABLE_BIT) { - status = status & ~SPMI_PIC_ACC_ENABLE_BIT; - writel_relaxed(status, pa->intr + - pa->ver_ops->acc_enable(apid)); - } - raw_spin_unlock_irqrestore(&pa->lock, flags); - - data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1); } @@ -568,20 +580,12 @@ static void qpnpint_irq_unmask(struct irq_data *d) struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; u8 apid = d->hwirq; - unsigned long flags; - u32 status; - u8 data; + u8 data = BIT(irq); - raw_spin_lock_irqsave(&pa->lock, flags); - status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid)); - if (!(status & SPMI_PIC_ACC_ENABLE_BIT)) { - writel_relaxed(status | SPMI_PIC_ACC_ENABLE_BIT, - pa->intr + pa->ver_ops->acc_enable(apid)); - } - raw_spin_unlock_irqrestore(&pa->lock, flags); + writel_relaxed(SPMI_PIC_ACC_ENABLE_BIT, + pa->intr + pa->ver_ops->acc_enable(apid)); - data = BIT(irq); - qpnpint_spmi_write(d, QPNPINT_REG_EN_SET, &data, 1); + qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1); } static void qpnpint_irq_enable(struct irq_data *d) @@ -755,7 +759,7 @@ pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) *apid = SPMI_MAPPING_BIT_IS_1_RESULT(data); pa->ppid_to_apid[ppid] = *apid | PMIC_ARB_CHAN_VALID; - pa->apid_to_ppid[*apid] = ppid; + pa->apid_data[*apid].ppid = ppid; return 0; } } else { @@ -765,7 +769,7 @@ pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) *apid = SPMI_MAPPING_BIT_IS_0_RESULT(data); pa->ppid_to_apid[ppid] = *apid | PMIC_ARB_CHAN_VALID; - pa->apid_to_ppid[*apid] = ppid; + pa->apid_data[*apid].ppid = ppid; return 0; } } @@ -802,7 +806,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid) for (apid = pa->last_apid; apid < pa->max_periph; apid++) { regval = readl_relaxed(pa->cnfg + SPMI_OWNERSHIP_TABLE_REG(apid)); - pa->apid_to_owner[apid] = SPMI_OWNERSHIP_PERIPH2OWNER(regval); + pa->apid_data[apid].owner = SPMI_OWNERSHIP_PERIPH2OWNER(regval); offset = PMIC_ARB_REG_CHNL(apid); if (offset >= pa->core_size) @@ -814,7 +818,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid) id = (regval >> 8) & PMIC_ARB_PPID_MASK; pa->ppid_to_apid[id] = apid | PMIC_ARB_CHAN_VALID; - pa->apid_to_ppid[apid] = id; + pa->apid_data[apid].ppid = id; if (id == ppid) { apid |= PMIC_ARB_CHAN_VALID; break; @@ -846,7 +850,6 @@ static int pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { u8 apid; - u8 owner; int rc; rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid); @@ -856,8 +859,7 @@ pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) *mode = 0; *mode |= S_IRUSR; - owner = pa->apid_to_owner[apid]; - if (owner == pa->ee) + if (pa->ee == pa->apid_data[apid].owner) *mode |= S_IWUSR; return 0; } @@ -1028,15 +1030,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) err = -ENOMEM; goto err_put_ctrl; } - - pa->apid_to_owner = devm_kcalloc(&ctrl->dev, - pa->max_periph, - sizeof(*pa->apid_to_owner), - GFP_KERNEL); - if (!pa->apid_to_owner) { - err = -ENOMEM; - goto err_put_ctrl; - } } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr"); @@ -1088,14 +1081,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) pa->ee = ee; - pa->apid_to_ppid = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PERIPHS, - sizeof(*pa->apid_to_ppid), - GFP_KERNEL); - if (!pa->apid_to_ppid) { - err = -ENOMEM; - goto err_put_ctrl; - } - pa->mapping_table = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PERIPHS - 1, sizeof(*pa->mapping_table), GFP_KERNEL); if (!pa->mapping_table) { -- cgit v1.2.3 From f6dda8e2e8479f3a71c88d6a21fe98d0fa7e0e31 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:36 +0530 Subject: spmi: pmic-arb: fix missing interrupts irq_enable is called when the device resumes. Note that the irq_enable is called regardless of whether the interrupt was marked enabled/disabled in the descriptor or whether it was masked/unmasked at the controller while resuming. The current driver unconditionally clears the interrupt in its irq_enable callback. This is dangerous as any interrupts that happen right before the resume could be missed. Remove the irq_enable callback and use mask/unmask instead. Also remove struct pmic_arb_irq_spec as it serves no real purpose. It is used only in the translate function and the code is much cleaner without it. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 29 +++-------------------------- 1 file changed, 3 insertions(+), 26 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 0a5728cab184..bc0373720198 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -588,17 +588,6 @@ static void qpnpint_irq_unmask(struct irq_data *d) qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1); } -static void qpnpint_irq_enable(struct irq_data *d) -{ - u8 irq = d->hwirq >> 8; - u8 data; - - qpnpint_irq_unmask(d); - - data = BIT(irq); - qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1); -} - static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type) { struct spmi_pmic_arb_qpnpint_type type; @@ -647,7 +636,6 @@ static int qpnpint_get_irqchip_state(struct irq_data *d, static struct irq_chip pmic_arb_irqchip = { .name = "pmic_arb", - .irq_enable = qpnpint_irq_enable, .irq_ack = qpnpint_irq_ack, .irq_mask = qpnpint_irq_mask, .irq_unmask = qpnpint_irq_unmask, @@ -657,12 +645,6 @@ static struct irq_chip pmic_arb_irqchip = { | IRQCHIP_SKIP_SET_WAKE, }; -struct spmi_pmic_arb_irq_spec { - unsigned slave:4; - unsigned per:8; - unsigned irq:3; -}; - static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, struct device_node *controller, const u32 *intspec, @@ -671,7 +653,6 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, unsigned int *out_type) { struct spmi_pmic_arb *pa = d->host_data; - struct spmi_pmic_arb_irq_spec spec; int rc; u8 apid; @@ -686,10 +667,6 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, if (intspec[0] > 0xF || intspec[1] > 0xFF || intspec[2] > 0x7) return -EINVAL; - spec.slave = intspec[0]; - spec.per = intspec[1]; - spec.irq = intspec[2]; - rc = pa->ver_ops->ppid_to_apid(pa, intspec[0], (intspec[1] << 8), &apid); if (rc < 0) { @@ -705,9 +682,9 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, if (apid < pa->min_apid) pa->min_apid = apid; - *out_hwirq = spec.slave << 24 - | spec.per << 16 - | spec.irq << 8 + *out_hwirq = (intspec[0] & 0xF) << 24 + | (intspec[1] & 0xFF) << 16 + | (intspec[2] & 0x7) << 8 | apid; *out_type = intspec[3] & IRQ_TYPE_SENSE_MASK; -- cgit v1.2.3 From cee0fad772a22c5b309fed3f4c93dc84087059a6 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:37 +0530 Subject: spmi: pmic-arb: clear the latched status of the interrupt PMIC interrupts each have an internal latched status bit which is not visible from any register. This status bit is set as soon as the conditions specified in the interrupt type and polarity registers are met even if the interrupt is not enabled. When it is set, nothing else changes within the PMIC and no interrupt notification packets are sent. If the internal latched status bit is set when an interrupt is enabled, then the value is immediately propagated into the interrupt latched status register and an interrupt notification packet is sent out from the PMIC over SPMI. This PMIC hardware behavior can lead to a situation where the handler for a level triggered interrupt is called immediately after enable_irq() is called even though the interrupt physically triggered while it was disabled within the genirq framework. This situation takes place if the the interrupt fires twice after calling disable_irq(). The first time it fires, the level flow handler will mask and disregard it. Unfortunately, the second time it fires, the internal latched status bit is set within the PMIC and no further notification is received. When enable_irq() is called later, the interrupt is unmasked (enabled in the PMIC) which results in the PMIC immediately sending an interrupt notification packet out over SPMI. This breaks the semantics of level triggered interrupts within the genirq framework since they should be completely ignored while disabled. The PMIC internal latched status behavior also affects how interrupts are treated during suspend. While entering suspend, all interrupts not specified as wakeup mode are masked. Upon resume, these interrupts are unmasked. Thus if any of the non-wakeup PMIC interrupts fired while the system was suspended, then the PMIC will send interrupt notification packets out via SPMI as soon as they are unmasked during resume. This behavior violates genirq semantics as well since non-wakeup interrupts should be completely ignored during suspend. Modify the qpnpint_irq_unmask() function so that the interrupt latched status clear register is written immediately before the interrupt enable register. This clears the internal latched status bit of the interrupt so that it cannot trigger spuriously immediately upon being enabled. Also, while resuming an irq, an unmask could be called even if it was not previously masked. So, before writing these registers, check if the interrupt is already enabled within the PMIC. If it is, then no further register writes are required. This condition check ensures that a valid latched status register bit is not cleared until it is properly handled. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index bc0373720198..1d23df09bad8 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -580,12 +580,22 @@ static void qpnpint_irq_unmask(struct irq_data *d) struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); u8 irq = d->hwirq >> 8; u8 apid = d->hwirq; - u8 data = BIT(irq); + u8 buf[2]; writel_relaxed(SPMI_PIC_ACC_ENABLE_BIT, pa->intr + pa->ver_ops->acc_enable(apid)); - qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1); + qpnpint_spmi_read(d, QPNPINT_REG_EN_SET, &buf[0], 1); + if (!(buf[0] & BIT(irq))) { + /* + * Since the interrupt is currently disabled, write to both the + * LATCHED_CLR and EN_SET registers so that a spurious interrupt + * cannot be triggered when the interrupt is enabled + */ + buf[0] = BIT(irq); + buf[1] = BIT(irq); + qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &buf, 2); + } } static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type) -- cgit v1.2.3 From 5f9b2ea3da8cf079e22cbb0fc2ed1b9034f7dd42 Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:38 +0530 Subject: spmi: pmic_arb: use appropriate flow handler The current code uses handle_level_irq flow handler even if the trigger type of the interrupt is edge. This can lead to missing of an edge transition that happens when the interrupt is being handled. The level flow handler masks the interrupt while it is being handled, so if an edge transition happens at that time, that edge is lost. Use an edge flow handler for edge type interrupts which ensures that the interrupt stays enabled while being handled - at least until it triggers at which point the flow handler sets the IRQF_PENDING flag and only then masks the interrupt. That IRQF_PENDING state indicates an edge transition happened while the interrupt was being handled and the handler is called again. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 1d23df09bad8..ad344916493c 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -625,6 +625,12 @@ static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type) } qpnpint_spmi_write(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type)); + + if (flow_type & IRQ_TYPE_EDGE_BOTH) + irq_set_handler_locked(d, handle_edge_irq); + else + irq_set_handler_locked(d, handle_level_irq); + return 0; } -- cgit v1.2.3 From 472eaf8bedbbedc4df5f7007d1eceb4624a78afa Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:39 +0530 Subject: spmi: pmic-arb: check apid enabled before calling the handler The driver currently invokes the apid handler (periph_handler()) once it sees that the summary status bit for that apid is set. However the hardware is designed to set that bit even if the apid interrupts are disabled. The driver should check whether the apid is indeed enabled before calling the apid handler. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index ad344916493c..f8638faaac9d 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -536,8 +536,8 @@ static void pmic_arb_chained_irq(struct irq_desc *desc) void __iomem *intr = pa->intr; int first = pa->min_apid >> 5; int last = pa->max_apid >> 5; - u32 status; - int i, id; + u32 status, enable; + int i, id, apid; chained_irq_enter(chip, desc); @@ -547,7 +547,11 @@ static void pmic_arb_chained_irq(struct irq_desc *desc) while (status) { id = ffs(status) - 1; status &= ~BIT(id); - periph_interrupt(pa, id + i * 32); + apid = id + i * 32; + enable = readl_relaxed(intr + + pa->ver_ops->acc_enable(apid)); + if (enable & SPMI_PIC_ACC_ENABLE_BIT) + periph_interrupt(pa, apid); } } -- cgit v1.2.3 From 319f68843db8005610a921942c9f539fdcf8017a Mon Sep 17 00:00:00 2001 From: Abhijeet Dharmapurikar Date: Wed, 10 May 2017 19:55:40 +0530 Subject: spmi: pmic_arb: add support for PMIC bus arbiter v3 PMIC bus arbiter v3 supports 512 SPMI peripherals. Add the v3 operators to support this new arbiter version. Signed-off-by: Abhijeet Dharmapurikar Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 133 +++++++++++++++++++++++++++---------------- 1 file changed, 83 insertions(+), 50 deletions(-) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index f8638faaac9d..0deac33a2c30 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -28,6 +28,7 @@ /* PMIC Arbiter configuration registers */ #define PMIC_ARB_VERSION 0x0000 #define PMIC_ARB_VERSION_V2_MIN 0x20010000 +#define PMIC_ARB_VERSION_V3_MIN 0x30000000 #define PMIC_ARB_INT_EN 0x0004 /* PMIC Arbiter channel registers offsets */ @@ -96,6 +97,17 @@ enum pmic_arb_cmd_op_code { /* interrupt enable bit */ #define SPMI_PIC_ACC_ENABLE_BIT BIT(0) +#define HWIRQ(slave_id, periph_id, irq_id, apid) \ + ((((slave_id) & 0xF) << 28) | \ + (((periph_id) & 0xFF) << 20) | \ + (((irq_id) & 0x7) << 16) | \ + (((apid) & 0x1FF) << 0)) + +#define HWIRQ_SID(hwirq) (((hwirq) >> 28) & 0xF) +#define HWIRQ_PER(hwirq) (((hwirq) >> 20) & 0xFF) +#define HWIRQ_IRQ(hwirq) (((hwirq) >> 16) & 0x7) +#define HWIRQ_APID(hwirq) (((hwirq) >> 0) & 0x1FF) + struct pmic_arb_ver_ops; struct apid_data { @@ -151,7 +163,9 @@ struct spmi_pmic_arb { /** * pmic_arb_ver: version dependent functionality. * - * @mode: access rights to specified pmic peripheral. + * @ver_str: version string. + * @ppid_to_apid: finds the apid for a given ppid. + * @mode: access rights to specified pmic peripheral. * @non_data_cmd: on v1 issues an spmi non-data command. * on v2 no HW support, returns -EOPNOTSUPP. * @offset: on v1 offset of per-ee channel. @@ -167,8 +181,9 @@ struct spmi_pmic_arb { * on v2 offset of SPMI_PIC_IRQ_CLEARn. */ struct pmic_arb_ver_ops { + const char *ver_str; int (*ppid_to_apid)(struct spmi_pmic_arb *pa, u8 sid, u16 addr, - u8 *apid); + u16 *apid); int (*mode)(struct spmi_pmic_arb *dev, u8 sid, u16 addr, mode_t *mode); /* spmi commands (read_cmd, write_cmd, cmd) functionality */ @@ -177,10 +192,10 @@ struct pmic_arb_ver_ops { u32 (*fmt_cmd)(u8 opc, u8 sid, u16 addr, u8 bc); int (*non_data_cmd)(struct spmi_controller *ctrl, u8 opc, u8 sid); /* Interrupts controller functionality (offset of PIC registers) */ - u32 (*owner_acc_status)(u8 m, u8 n); - u32 (*acc_enable)(u8 n); - u32 (*irq_status)(u8 n); - u32 (*irq_clear)(u8 n); + u32 (*owner_acc_status)(u8 m, u16 n); + u32 (*acc_enable)(u16 n); + u32 (*irq_status)(u16 n); + u32 (*irq_clear)(u16 n); }; static inline void pmic_arb_base_write(struct spmi_pmic_arb *pa, @@ -462,8 +477,8 @@ static void qpnpint_spmi_write(struct irq_data *d, u8 reg, void *buf, size_t len) { struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); - u8 sid = d->hwirq >> 24; - u8 per = d->hwirq >> 16; + u8 sid = HWIRQ_SID(d->hwirq); + u8 per = HWIRQ_PER(d->hwirq); if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid, (per << 8) + reg, buf, len)) @@ -475,8 +490,8 @@ static void qpnpint_spmi_write(struct irq_data *d, u8 reg, void *buf, static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len) { struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); - u8 sid = d->hwirq >> 24; - u8 per = d->hwirq >> 16; + u8 sid = HWIRQ_SID(d->hwirq); + u8 per = HWIRQ_PER(d->hwirq); if (pmic_arb_read_cmd(pa->spmic, SPMI_CMD_EXT_READL, sid, (per << 8) + reg, buf, len)) @@ -485,7 +500,7 @@ static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len) d->irq); } -static void cleanup_irq(struct spmi_pmic_arb *pa, u8 apid, int id) +static void cleanup_irq(struct spmi_pmic_arb *pa, u16 apid, int id) { u16 ppid = pa->apid_data[apid].ppid; u8 sid = ppid >> 8; @@ -507,20 +522,19 @@ static void cleanup_irq(struct spmi_pmic_arb *pa, u8 apid, int id) irq_mask, ppid); } -static void periph_interrupt(struct spmi_pmic_arb *pa, u8 apid) +static void periph_interrupt(struct spmi_pmic_arb *pa, u16 apid) { unsigned int irq; u32 status; int id; + u8 sid = (pa->apid_data[apid].ppid >> 8) & 0xF; + u8 per = pa->apid_data[apid].ppid & 0xFF; status = readl_relaxed(pa->intr + pa->ver_ops->irq_status(apid)); while (status) { id = ffs(status) - 1; status &= ~BIT(id); - irq = irq_find_mapping(pa->domain, - pa->apid_data[apid].ppid << 16 - | id << 8 - | apid); + irq = irq_find_mapping(pa->domain, HWIRQ(sid, per, id, apid)); if (irq == 0) { cleanup_irq(pa, apid, id); continue; @@ -561,8 +575,8 @@ static void pmic_arb_chained_irq(struct irq_desc *desc) static void qpnpint_irq_ack(struct irq_data *d) { struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); - u8 irq = d->hwirq >> 8; - u8 apid = d->hwirq; + u8 irq = HWIRQ_IRQ(d->hwirq); + u16 apid = HWIRQ_APID(d->hwirq); u8 data; writel_relaxed(BIT(irq), pa->intr + pa->ver_ops->irq_clear(apid)); @@ -573,7 +587,7 @@ static void qpnpint_irq_ack(struct irq_data *d) static void qpnpint_irq_mask(struct irq_data *d) { - u8 irq = d->hwirq >> 8; + u8 irq = HWIRQ_IRQ(d->hwirq); u8 data = BIT(irq); qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1); @@ -582,8 +596,8 @@ static void qpnpint_irq_mask(struct irq_data *d) static void qpnpint_irq_unmask(struct irq_data *d) { struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d); - u8 irq = d->hwirq >> 8; - u8 apid = d->hwirq; + u8 irq = HWIRQ_IRQ(d->hwirq); + u16 apid = HWIRQ_APID(d->hwirq); u8 buf[2]; writel_relaxed(SPMI_PIC_ACC_ENABLE_BIT, @@ -605,7 +619,7 @@ static void qpnpint_irq_unmask(struct irq_data *d) static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type) { struct spmi_pmic_arb_qpnpint_type type; - u8 irq = d->hwirq >> 8; + u8 irq = HWIRQ_IRQ(d->hwirq); u8 bit_mask_irq = BIT(irq); qpnpint_spmi_read(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type)); @@ -642,7 +656,7 @@ static int qpnpint_get_irqchip_state(struct irq_data *d, enum irqchip_irq_state which, bool *state) { - u8 irq = d->hwirq >> 8; + u8 irq = HWIRQ_IRQ(d->hwirq); u8 status = 0; if (which != IRQCHIP_STATE_LINE_LEVEL) @@ -674,7 +688,7 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, { struct spmi_pmic_arb *pa = d->host_data; int rc; - u8 apid; + u16 apid; dev_dbg(&pa->spmic->dev, "intspec[0] 0x%1x intspec[1] 0x%02x intspec[2] 0x%02x\n", @@ -702,10 +716,7 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d, if (apid < pa->min_apid) pa->min_apid = apid; - *out_hwirq = (intspec[0] & 0xF) << 24 - | (intspec[1] & 0xFF) << 16 - | (intspec[2] & 0x7) << 8 - | apid; + *out_hwirq = HWIRQ(intspec[0], intspec[1], intspec[2], apid); *out_type = intspec[3] & IRQ_TYPE_SENSE_MASK; dev_dbg(&pa->spmic->dev, "out_hwirq = %lu\n", *out_hwirq); @@ -728,7 +739,7 @@ static int qpnpint_irq_domain_map(struct irq_domain *d, } static int -pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) +pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u16 *apid) { u16 ppid = sid << 8 | ((addr >> 8) & 0xFF); u32 *mapping_table = pa->mapping_table; @@ -776,7 +787,7 @@ pmic_arb_ppid_to_apid_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) } static int -pmic_arb_mode_v1(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) +pmic_arb_mode_v1_v3(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { *mode = S_IRUSR | S_IWUSR; return 0; @@ -828,7 +839,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid) static int -pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) +pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u16 *apid) { u16 ppid = (sid << 8) | (addr >> 8); u16 apid_valid; @@ -846,7 +857,7 @@ pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u8 *apid) static int pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) { - u8 apid; + u16 apid; int rc; rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid); @@ -865,7 +876,7 @@ pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode) static int pmic_arb_offset_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, u32 *offset) { - u8 apid; + u16 apid; int rc; rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid); @@ -886,49 +897,55 @@ static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc) return (opc << 27) | ((addr & 0xff) << 4) | (bc & 0x7); } -static u32 pmic_arb_owner_acc_status_v1(u8 m, u8 n) +static u32 pmic_arb_owner_acc_status_v1(u8 m, u16 n) { return 0x20 * m + 0x4 * n; } -static u32 pmic_arb_owner_acc_status_v2(u8 m, u8 n) +static u32 pmic_arb_owner_acc_status_v2(u8 m, u16 n) { return 0x100000 + 0x1000 * m + 0x4 * n; } -static u32 pmic_arb_acc_enable_v1(u8 n) +static u32 pmic_arb_owner_acc_status_v3(u8 m, u16 n) +{ + return 0x200000 + 0x1000 * m + 0x4 * n; +} + +static u32 pmic_arb_acc_enable_v1(u16 n) { return 0x200 + 0x4 * n; } -static u32 pmic_arb_acc_enable_v2(u8 n) +static u32 pmic_arb_acc_enable_v2(u16 n) { return 0x1000 * n; } -static u32 pmic_arb_irq_status_v1(u8 n) +static u32 pmic_arb_irq_status_v1(u16 n) { return 0x600 + 0x4 * n; } -static u32 pmic_arb_irq_status_v2(u8 n) +static u32 pmic_arb_irq_status_v2(u16 n) { return 0x4 + 0x1000 * n; } -static u32 pmic_arb_irq_clear_v1(u8 n) +static u32 pmic_arb_irq_clear_v1(u16 n) { return 0xA00 + 0x4 * n; } -static u32 pmic_arb_irq_clear_v2(u8 n) +static u32 pmic_arb_irq_clear_v2(u16 n) { return 0x8 + 0x1000 * n; } static const struct pmic_arb_ver_ops pmic_arb_v1 = { + .ver_str = "v1", .ppid_to_apid = pmic_arb_ppid_to_apid_v1, - .mode = pmic_arb_mode_v1, + .mode = pmic_arb_mode_v1_v3, .non_data_cmd = pmic_arb_non_data_cmd_v1, .offset = pmic_arb_offset_v1, .fmt_cmd = pmic_arb_fmt_cmd_v1, @@ -939,6 +956,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v1 = { }; static const struct pmic_arb_ver_ops pmic_arb_v2 = { + .ver_str = "v2", .ppid_to_apid = pmic_arb_ppid_to_apid_v2, .mode = pmic_arb_mode_v2, .non_data_cmd = pmic_arb_non_data_cmd_v2, @@ -950,6 +968,19 @@ static const struct pmic_arb_ver_ops pmic_arb_v2 = { .irq_clear = pmic_arb_irq_clear_v2, }; +static const struct pmic_arb_ver_ops pmic_arb_v3 = { + .ver_str = "v3", + .ppid_to_apid = pmic_arb_ppid_to_apid_v2, + .mode = pmic_arb_mode_v1_v3, + .non_data_cmd = pmic_arb_non_data_cmd_v2, + .offset = pmic_arb_offset_v2, + .fmt_cmd = pmic_arb_fmt_cmd_v2, + .owner_acc_status = pmic_arb_owner_acc_status_v3, + .acc_enable = pmic_arb_acc_enable_v2, + .irq_status = pmic_arb_irq_status_v2, + .irq_clear = pmic_arb_irq_clear_v2, +}; + static const struct irq_domain_ops pmic_arb_irq_domain_ops = { .map = qpnpint_irq_domain_map, .xlate = qpnpint_irq_domain_dt_translate, @@ -963,7 +994,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) void __iomem *core; u32 channel, ee, hw_ver; int err; - bool is_v1; ctrl = spmi_controller_alloc(&pdev->dev, sizeof(*pa)); if (!ctrl) @@ -987,21 +1017,21 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) } hw_ver = readl_relaxed(core + PMIC_ARB_VERSION); - is_v1 = (hw_ver < PMIC_ARB_VERSION_V2_MIN); - - dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2), - hw_ver); - if (is_v1) { + if (hw_ver < PMIC_ARB_VERSION_V2_MIN) { pa->ver_ops = &pmic_arb_v1; pa->wr_base = core; pa->rd_base = core; } else { pa->core = core; - pa->ver_ops = &pmic_arb_v2; + + if (hw_ver < PMIC_ARB_VERSION_V3_MIN) + pa->ver_ops = &pmic_arb_v2; + else + pa->ver_ops = &pmic_arb_v3; /* the apid to ppid table starts at PMIC_ARB_REG_CHNL(0) */ - pa->max_periph = (pa->core_size - PMIC_ARB_REG_CHNL(0)) / 4; + pa->max_periph = (pa->core_size - PMIC_ARB_REG_CHNL(0)) / 4; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "obsrvr"); @@ -1029,6 +1059,9 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) } } + dev_info(&ctrl->dev, "PMIC arbiter version %s (0x%x)\n", + pa->ver_ops->ver_str, hw_ver); + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr"); pa->intr = devm_ioremap_resource(&ctrl->dev, res); if (IS_ERR(pa->intr)) { -- cgit v1.2.3 From 76b069b1cb201748c3a87474fb8ef02be2a01ba8 Mon Sep 17 00:00:00 2001 From: Kiran Gunda Date: Wed, 10 May 2017 19:55:41 +0530 Subject: spmi: spmi-pmic-arb: enable the SPMI interrupt as a wakeup source Currently the SPMI interrupt will not wake the device. Enable this interrupt as a wakeup source. Signed-off-by: Nicholas Troast Signed-off-by: Kiran Gunda Signed-off-by: Greg Kroah-Hartman --- drivers/spmi/spmi-pmic-arb.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index 0deac33a2c30..2afe3597982e 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -1140,6 +1140,7 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev) } irq_set_chained_handler_and_data(pa->irq, pmic_arb_chained_irq, pa); + enable_irq_wake(pa->irq); err = spmi_controller_add(ctrl); if (err) -- cgit v1.2.3 From 761d031ec95b09f4126748a4849b3dabe3c00427 Mon Sep 17 00:00:00 2001 From: Arvind Yadav Date: Wed, 31 May 2017 15:55:54 +0530 Subject: memory: ti-aemif: Handle return value of clk_prepare_enable clk_prepare_enable() can fail here and we must check its return value. Signed-off-by: Arvind Yadav Signed-off-by: Greg Kroah-Hartman --- drivers/memory/ti-aemif.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/memory/ti-aemif.c b/drivers/memory/ti-aemif.c index 22c1aeeb6421..2744b1b91b57 100644 --- a/drivers/memory/ti-aemif.c +++ b/drivers/memory/ti-aemif.c @@ -357,7 +357,10 @@ static int aemif_probe(struct platform_device *pdev) return PTR_ERR(aemif->clk); } - clk_prepare_enable(aemif->clk); + ret = clk_prepare_enable(aemif->clk); + if (ret) + return ret; + aemif->clk_rate = clk_get_rate(aemif->clk) / MSEC_PER_SEC; if (of_device_is_compatible(np, "ti,da850-aemif")) -- cgit v1.2.3 From 9f4f9ae81d0affc182f54dd00285ddb90e0b3ae1 Mon Sep 17 00:00:00 2001 From: Robert Lippert Date: Fri, 2 Jun 2017 14:53:22 -0700 Subject: drivers/misc: add Aspeed LPC snoop driver This driver enables the LPC snoop hardware on the ASPEED BMC which generates an interrupt upon every write to an I/O port by the host. This is typically used to monitor BIOS boot progress by listening to well-known debug port 80h. The functionality in this commit just saves all snooped values to a circular 2K buffer in the kernel, subsequent commits can act on the values to do things with them. Signed-off-by: Robert Lippert Signed-off-by: Greg Kroah-Hartman --- drivers/misc/Kconfig | 8 ++ drivers/misc/Makefile | 1 + drivers/misc/aspeed-lpc-snoop.c | 261 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/misc/aspeed-lpc-snoop.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 07bbd4cc1852..8136dc7e863d 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -490,6 +490,14 @@ config ASPEED_LPC_CTRL ioctl()s, the driver also provides a read/write interface to a BMC ram region where the host LPC read/write region can be buffered. +config ASPEED_LPC_SNOOP + tristate "Aspeed ast2500 HOST LPC snoop support" + depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP && MFD_SYSCON + help + Provides a driver to control the LPC snoop interface which + allows the BMC to listen on and save the data written by + the host to an arbitrary LPC I/O port. + config PCI_ENDPOINT_TEST depends on PCI select CRC32 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 81ef3e67acc9..b0b766416306 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_ECHO) += echo/ obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o obj-$(CONFIG_CXL_BASE) += cxl/ obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o +obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o lkdtm-$(CONFIG_LKDTM) += lkdtm_core.o diff --git a/drivers/misc/aspeed-lpc-snoop.c b/drivers/misc/aspeed-lpc-snoop.c new file mode 100644 index 000000000000..593905565b74 --- /dev/null +++ b/drivers/misc/aspeed-lpc-snoop.c @@ -0,0 +1,261 @@ +/* + * Copyright 2017 Google Inc + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Provides a simple driver to control the ASPEED LPC snoop interface which + * allows the BMC to listen on and save the data written by + * the host to an arbitrary LPC I/O port. + * + * Typically used by the BMC to "watch" host boot progress via port + * 0x80 writes made by the BIOS during the boot process. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define DEVICE_NAME "aspeed-lpc-snoop" + +#define NUM_SNOOP_CHANNELS 2 +#define SNOOP_FIFO_SIZE 2048 + +#define HICR5 0x0 +#define HICR5_EN_SNP0W BIT(0) +#define HICR5_ENINT_SNP0W BIT(1) +#define HICR5_EN_SNP1W BIT(2) +#define HICR5_ENINT_SNP1W BIT(3) + +#define HICR6 0x4 +#define HICR6_STR_SNP0W BIT(0) +#define HICR6_STR_SNP1W BIT(1) +#define SNPWADR 0x10 +#define SNPWADR_CH0_MASK GENMASK(15, 0) +#define SNPWADR_CH0_SHIFT 0 +#define SNPWADR_CH1_MASK GENMASK(31, 16) +#define SNPWADR_CH1_SHIFT 16 +#define SNPWDR 0x14 +#define SNPWDR_CH0_MASK GENMASK(7, 0) +#define SNPWDR_CH0_SHIFT 0 +#define SNPWDR_CH1_MASK GENMASK(15, 8) +#define SNPWDR_CH1_SHIFT 8 +#define HICRB 0x80 +#define HICRB_ENSNP0D BIT(14) +#define HICRB_ENSNP1D BIT(15) + +struct aspeed_lpc_snoop { + struct regmap *regmap; + int irq; + struct kfifo snoop_fifo[NUM_SNOOP_CHANNELS]; +}; + +/* Save a byte to a FIFO and discard the oldest byte if FIFO is full */ +static void put_fifo_with_discard(struct kfifo *fifo, u8 val) +{ + if (!kfifo_initialized(fifo)) + return; + if (kfifo_is_full(fifo)) + kfifo_skip(fifo); + kfifo_put(fifo, val); +} + +static irqreturn_t aspeed_lpc_snoop_irq(int irq, void *arg) +{ + struct aspeed_lpc_snoop *lpc_snoop = arg; + u32 reg, data; + + if (regmap_read(lpc_snoop->regmap, HICR6, ®)) + return IRQ_NONE; + + /* Check if one of the snoop channels is interrupting */ + reg &= (HICR6_STR_SNP0W | HICR6_STR_SNP1W); + if (!reg) + return IRQ_NONE; + + /* Ack pending IRQs */ + regmap_write(lpc_snoop->regmap, HICR6, reg); + + /* Read and save most recent snoop'ed data byte to FIFO */ + regmap_read(lpc_snoop->regmap, SNPWDR, &data); + + if (reg & HICR6_STR_SNP0W) { + u8 val = (data & SNPWDR_CH0_MASK) >> SNPWDR_CH0_SHIFT; + + put_fifo_with_discard(&lpc_snoop->snoop_fifo[0], val); + } + if (reg & HICR6_STR_SNP1W) { + u8 val = (data & SNPWDR_CH1_MASK) >> SNPWDR_CH1_SHIFT; + + put_fifo_with_discard(&lpc_snoop->snoop_fifo[1], val); + } + + return IRQ_HANDLED; +} + +static int aspeed_lpc_snoop_config_irq(struct aspeed_lpc_snoop *lpc_snoop, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int rc; + + lpc_snoop->irq = platform_get_irq(pdev, 0); + if (!lpc_snoop->irq) + return -ENODEV; + + rc = devm_request_irq(dev, lpc_snoop->irq, + aspeed_lpc_snoop_irq, IRQF_SHARED, + DEVICE_NAME, lpc_snoop); + if (rc < 0) { + dev_warn(dev, "Unable to request IRQ %d\n", lpc_snoop->irq); + lpc_snoop->irq = 0; + return rc; + } + + return 0; +} + +static int aspeed_lpc_enable_snoop(struct aspeed_lpc_snoop *lpc_snoop, + int channel, u16 lpc_port) +{ + int rc = 0; + u32 hicr5_en, snpwadr_mask, snpwadr_shift, hicrb_en; + + /* Create FIFO datastructure */ + rc = kfifo_alloc(&lpc_snoop->snoop_fifo[channel], + SNOOP_FIFO_SIZE, GFP_KERNEL); + if (rc) + return rc; + + /* Enable LPC snoop channel at requested port */ + switch (channel) { + case 0: + hicr5_en = HICR5_EN_SNP0W | HICR5_ENINT_SNP0W; + snpwadr_mask = SNPWADR_CH0_MASK; + snpwadr_shift = SNPWADR_CH0_SHIFT; + hicrb_en = HICRB_ENSNP0D; + break; + case 1: + hicr5_en = HICR5_EN_SNP1W | HICR5_ENINT_SNP1W; + snpwadr_mask = SNPWADR_CH1_MASK; + snpwadr_shift = SNPWADR_CH1_SHIFT; + hicrb_en = HICRB_ENSNP1D; + break; + default: + return -EINVAL; + } + + regmap_update_bits(lpc_snoop->regmap, HICR5, hicr5_en, hicr5_en); + regmap_update_bits(lpc_snoop->regmap, SNPWADR, snpwadr_mask, + lpc_port << snpwadr_shift); + regmap_update_bits(lpc_snoop->regmap, HICRB, hicrb_en, hicrb_en); + + return rc; +} + +static void aspeed_lpc_disable_snoop(struct aspeed_lpc_snoop *lpc_snoop, + int channel) +{ + switch (channel) { + case 0: + regmap_update_bits(lpc_snoop->regmap, HICR5, + HICR5_EN_SNP0W | HICR5_ENINT_SNP0W, + 0); + break; + case 1: + regmap_update_bits(lpc_snoop->regmap, HICR5, + HICR5_EN_SNP1W | HICR5_ENINT_SNP1W, + 0); + break; + default: + return; + } + + kfifo_free(&lpc_snoop->snoop_fifo[channel]); +} + +static int aspeed_lpc_snoop_probe(struct platform_device *pdev) +{ + struct aspeed_lpc_snoop *lpc_snoop; + struct device *dev; + u32 port; + int rc; + + dev = &pdev->dev; + + lpc_snoop = devm_kzalloc(dev, sizeof(*lpc_snoop), GFP_KERNEL); + if (!lpc_snoop) + return -ENOMEM; + + lpc_snoop->regmap = syscon_node_to_regmap( + pdev->dev.parent->of_node); + if (IS_ERR(lpc_snoop->regmap)) { + dev_err(dev, "Couldn't get regmap\n"); + return -ENODEV; + } + + dev_set_drvdata(&pdev->dev, lpc_snoop); + + rc = of_property_read_u32_index(dev->of_node, "snoop-ports", 0, &port); + if (rc) { + dev_err(dev, "no snoop ports configured\n"); + return -ENODEV; + } + + rc = aspeed_lpc_snoop_config_irq(lpc_snoop, pdev); + if (rc) + return rc; + + rc = aspeed_lpc_enable_snoop(lpc_snoop, 0, port); + if (rc) + return rc; + + /* Configuration of 2nd snoop channel port is optional */ + if (of_property_read_u32_index(dev->of_node, "snoop-ports", + 1, &port) == 0) { + rc = aspeed_lpc_enable_snoop(lpc_snoop, 1, port); + if (rc) + aspeed_lpc_disable_snoop(lpc_snoop, 0); + } + + return rc; +} + +static int aspeed_lpc_snoop_remove(struct platform_device *pdev) +{ + struct aspeed_lpc_snoop *lpc_snoop = dev_get_drvdata(&pdev->dev); + + /* Disable both snoop channels */ + aspeed_lpc_disable_snoop(lpc_snoop, 0); + aspeed_lpc_disable_snoop(lpc_snoop, 1); + + return 0; +} + +static const struct of_device_id aspeed_lpc_snoop_match[] = { + { .compatible = "aspeed,ast2500-lpc-snoop" }, + { }, +}; + +static struct platform_driver aspeed_lpc_snoop_driver = { + .driver = { + .name = DEVICE_NAME, + .of_match_table = aspeed_lpc_snoop_match, + }, + .probe = aspeed_lpc_snoop_probe, + .remove = aspeed_lpc_snoop_remove, +}; + +module_platform_driver(aspeed_lpc_snoop_driver); + +MODULE_DEVICE_TABLE(of, aspeed_lpc_snoop_match); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Robert Lippert "); +MODULE_DESCRIPTION("Linux driver to control Aspeed LPC snoop functionality"); -- cgit v1.2.3 From b594b10144f631130110b424d9d5e4f152f14e0c Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:04 +0200 Subject: devres: trivial whitespace fix Everything else is indented with two spaces, so fix the odd one out. Acked-by: Jonathan Cameron Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- Documentation/driver-model/devres.txt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index e72587fe477d..af08b4cd7968 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -335,7 +335,7 @@ MEM devm_kzalloc() MFD - devm_mfd_add_devices() + devm_mfd_add_devices() PER-CPU MEM devm_alloc_percpu() -- cgit v1.2.3 From 256ac0375098e50d59c415fcbb561f2927fa8780 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:05 +0200 Subject: dt-bindings: document devicetree bindings for mux-controllers and gpio-mux Allow specifying that a single multiplexer controller can be used to control several parallel multiplexers, thus enabling sharing of the multiplexer controller by different consumers. Add a binding for a first mux controller in the form of a GPIO based mux controller. Acked-by: Jonathan Cameron Acked-by: Rob Herring Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- Documentation/devicetree/bindings/mux/gpio-mux.txt | 69 +++++++++ .../devicetree/bindings/mux/mux-controller.txt | 157 +++++++++++++++++++++ MAINTAINERS | 6 + include/dt-bindings/mux/mux.h | 16 +++ 4 files changed, 248 insertions(+) create mode 100644 Documentation/devicetree/bindings/mux/gpio-mux.txt create mode 100644 Documentation/devicetree/bindings/mux/mux-controller.txt create mode 100644 include/dt-bindings/mux/mux.h diff --git a/Documentation/devicetree/bindings/mux/gpio-mux.txt b/Documentation/devicetree/bindings/mux/gpio-mux.txt new file mode 100644 index 000000000000..b8f746344d80 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/gpio-mux.txt @@ -0,0 +1,69 @@ +GPIO-based multiplexer controller bindings + +Define what GPIO pins are used to control a multiplexer. Or several +multiplexers, if the same pins control more than one multiplexer. + +Required properties: +- compatible : "gpio-mux" +- mux-gpios : list of gpios used to control the multiplexer, least + significant bit first. +- #mux-control-cells : <0> +* Standard mux-controller bindings as decribed in mux-controller.txt + +Optional properties: +- idle-state : if present, the state the mux will have when idle. The + special state MUX_IDLE_AS_IS is the default. + +The multiplexer state is defined as the number represented by the +multiplexer GPIO pins, where the first pin is the least significant +bit. An active pin is a binary 1, an inactive pin is a binary 0. + +Example: + + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + + channels = "sync-1", "in", "out", "sync-2"; + }; + + i2c-mux { + compatible = "i2c-mux"; + i2c-parent = <&i2c1>; + + mux-controls = <&mux>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + + ssd1307: oled@3c { + /* ... */ + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + pca9555: pca9555@20 { + /* ... */ + }; + }; + }; diff --git a/Documentation/devicetree/bindings/mux/mux-controller.txt b/Documentation/devicetree/bindings/mux/mux-controller.txt new file mode 100644 index 000000000000..4f47e4bd2fa0 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/mux-controller.txt @@ -0,0 +1,157 @@ +Common multiplexer controller bindings +====================================== + +A multiplexer (or mux) controller will have one, or several, consumer devices +that uses the mux controller. Thus, a mux controller can possibly control +several parallel multiplexers. Presumably there will be at least one +multiplexer needed by each consumer, but a single mux controller can of course +control several multiplexers for a single consumer. + +A mux controller provides a number of states to its consumers, and the state +space is a simple zero-based enumeration. I.e. 0-1 for a 2-way multiplexer, +0-7 for an 8-way multiplexer, etc. + + +Consumers +--------- + +Mux controller consumers should specify a list of mux controllers that they +want to use with a property containing a 'mux-ctrl-list': + + mux-ctrl-list ::= [mux-ctrl-list] + single-mux-ctrl ::= [mux-ctrl-specifier] + mux-ctrl-phandle : phandle to mux controller node + mux-ctrl-specifier : array of #mux-control-cells specifying the + given mux controller (controller specific) + +Mux controller properties should be named "mux-controls". The exact meaning of +each mux controller property must be documented in the device tree binding for +each consumer. An optional property "mux-control-names" may contain a list of +strings to label each of the mux controllers listed in the "mux-controls" +property. + +Drivers for devices that use more than a single mux controller can use the +"mux-control-names" property to map the name of the requested mux controller +to an index into the list given by the "mux-controls" property. + +mux-ctrl-specifier typically encodes the chip-relative mux controller number. +If the mux controller chip only provides a single mux controller, the +mux-ctrl-specifier can typically be left out. + +Example: + + /* One consumer of a 2-way mux controller (one GPIO-line) */ + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + mux-control-names = "adc"; + + channels = "sync", "in"; + }; + +Note that in the example above, specifying the "mux-control-names" is redundant +because there is only one mux controller in the list. However, if the driver +for the consumer node in fact asks for a named mux controller, that name is of +course still required. + + /* + * Two consumers (one for an ADC line and one for an i2c bus) of + * parallel 4-way multiplexers controlled by the same two GPIO-lines. + */ + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + + channels = "sync-1", "in", "out", "sync-2"; + }; + + i2c-mux { + compatible = "i2c-mux"; + i2c-parent = <&i2c1>; + + mux-controls = <&mux>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + + ssd1307: oled@3c { + /* ... */ + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + pca9555: pca9555@20 { + /* ... */ + }; + }; + }; + + +Mux controller nodes +-------------------- + +Mux controller nodes must specify the number of cells used for the +specifier using the '#mux-control-cells' property. + +Optionally, mux controller nodes can also specify the state the mux should +have when it is idle. The idle-state property is used for this. If the +idle-state is not present, the mux controller is typically left as is when +it is idle. For multiplexer chips that expose several mux controllers, the +idle-state property is an array with one idle state for each mux controller. + +The special value (-1) may be used to indicate that the mux should be left +as is when it is idle. This is the default, but can still be useful for +mux controller chips with more than one mux controller, particularly when +there is a need to "step past" a mux controller and set some other idle +state for a mux controller with a higher index. + +Some mux controllers have the ability to disconnect the input/output of the +multiplexer. Using this disconnected high-impedance state as the idle state +is indicated with idle state (-2). + +These constants are available in + + #include + +as MUX_IDLE_AS_IS (-1) and MUX_IDLE_DISCONNECT (-2). + +An example mux controller node look like this (the adg972a chip is a triple +4-way multiplexer): + + mux: mux-controller@50 { + compatible = "adi,adg792a"; + reg = <0x50>; + #mux-control-cells = <1>; + + idle-state = ; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 9e984645c4b0..b2cc32caabb9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8716,6 +8716,12 @@ S: Orphan F: drivers/mmc/host/mmc_spi.c F: include/linux/spi/mmc_spi.h +MULTIPLEXER SUBSYSTEM +M: Peter Rosin +S: Maintained +F: Documentation/devicetree/bindings/mux/ +F: include/linux/dt-bindings/mux/ + MULTISOUND SOUND DRIVER M: Andrew Veliath S: Maintained diff --git a/include/dt-bindings/mux/mux.h b/include/dt-bindings/mux/mux.h new file mode 100644 index 000000000000..c8e855c4a609 --- /dev/null +++ b/include/dt-bindings/mux/mux.h @@ -0,0 +1,16 @@ +/* + * This header provides constants for most Multiplexer bindings. + * + * Most Multiplexer bindings specify an idle state. In most cases, the + * the multiplexer can be left as is when idle, and in some cases it can + * disconnect the input/output and leave the multiplexer in a high + * impedance state. + */ + +#ifndef _DT_BINDINGS_MUX_MUX_H +#define _DT_BINDINGS_MUX_MUX_H + +#define MUX_IDLE_AS_IS (-1) +#define MUX_IDLE_DISCONNECT (-2) + +#endif -- cgit v1.2.3 From a3b02a9c6591ce154cd44e2383406390a45b530c Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:06 +0200 Subject: mux: minimal mux subsystem Add a new minimalistic subsystem that handles multiplexer controllers. When multiplexers are used in various places in the kernel, and the same multiplexer controller can be used for several independent things, there should be one place to implement support for said multiplexer controller. A single multiplexer controller can also be used to control several parallel multiplexers, that are in turn used by different subsystems in the kernel, leading to a need to coordinate multiplexer accesses. The multiplexer subsystem handles this coordination. Thanks go out to Lars-Peter Clausen, Jonathan Cameron, Rob Herring, Wolfram Sang, Paul Gortmaker, Dan Carpenter, Colin Ian King, Greg Kroah-Hartman and last but certainly not least to Philipp Zabel for helpful comments, reviews, patches and general encouragement! Reviewed-by: Jonathan Cameron Signed-off-by: Peter Rosin Reviewed-by: Philipp Zabel Tested-by: Philipp Zabel Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-class-mux | 16 + Documentation/driver-model/devres.txt | 5 + MAINTAINERS | 3 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/mux/Kconfig | 16 + drivers/mux/Makefile | 5 + drivers/mux/mux-core.c | 547 ++++++++++++++++++++++++++++++ include/linux/mux/consumer.h | 32 ++ include/linux/mux/driver.h | 108 ++++++ 10 files changed, 735 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-mux create mode 100644 drivers/mux/Kconfig create mode 100644 drivers/mux/Makefile create mode 100644 drivers/mux/mux-core.c create mode 100644 include/linux/mux/consumer.h create mode 100644 include/linux/mux/driver.h diff --git a/Documentation/ABI/testing/sysfs-class-mux b/Documentation/ABI/testing/sysfs-class-mux new file mode 100644 index 000000000000..8715f9c7bd4f --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-mux @@ -0,0 +1,16 @@ +What: /sys/class/mux/ +Date: April 2017 +KernelVersion: 4.13 +Contact: Peter Rosin +Description: + The mux/ class sub-directory belongs to the Generic MUX + Framework and provides a sysfs interface for using MUX + controllers. + +What: /sys/class/mux/muxchipN/ +Date: April 2017 +KernelVersion: 4.13 +Contact: Peter Rosin +Description: + A /sys/class/mux/muxchipN directory is created for each + probed MUX chip where N is a simple enumeration. diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index af08b4cd7968..40e4787c399c 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -337,6 +337,11 @@ MEM MFD devm_mfd_add_devices() +MUX + devm_mux_chip_alloc() + devm_mux_chip_register() + devm_mux_control_get() + PER-CPU MEM devm_alloc_percpu() devm_free_percpu() diff --git a/MAINTAINERS b/MAINTAINERS index b2cc32caabb9..a507bb4316ce 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8719,8 +8719,11 @@ F: include/linux/spi/mmc_spi.h MULTIPLEXER SUBSYSTEM M: Peter Rosin S: Maintained +F: Documentation/ABI/testing/mux/sysfs-class-mux* F: Documentation/devicetree/bindings/mux/ F: include/linux/dt-bindings/mux/ +F: include/linux/mux/ +F: drivers/mux/ MULTISOUND SOUND DRIVER M: Andrew Veliath diff --git a/drivers/Kconfig b/drivers/Kconfig index ba2901e76769..505c676fa9c7 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -206,4 +206,6 @@ source "drivers/fsi/Kconfig" source "drivers/tee/Kconfig" +source "drivers/mux/Kconfig" + endmenu diff --git a/drivers/Makefile b/drivers/Makefile index cfabd141dba2..dfdcda00bfe3 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -181,3 +181,4 @@ obj-$(CONFIG_NVMEM) += nvmem/ obj-$(CONFIG_FPGA) += fpga/ obj-$(CONFIG_FSI) += fsi/ obj-$(CONFIG_TEE) += tee/ +obj-$(CONFIG_MULTIPLEXER) += mux/ diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig new file mode 100644 index 000000000000..23ab2cde83b1 --- /dev/null +++ b/drivers/mux/Kconfig @@ -0,0 +1,16 @@ +# +# Multiplexer devices +# + +menuconfig MULTIPLEXER + tristate "Multiplexer subsystem" + help + Multiplexer controller subsystem. Multiplexers are used in a + variety of settings, and this subsystem abstracts their use + so that the rest of the kernel sees a common interface. When + multiple parallel multiplexers are controlled by one single + multiplexer controller, this subsystem also coordinates the + multiplexer accesses. + + To compile the subsystem as a module, choose M here: the module will + be called mux-core. diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile new file mode 100644 index 000000000000..09f0299e109d --- /dev/null +++ b/drivers/mux/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for multiplexer devices. +# + +obj-$(CONFIG_MULTIPLEXER) += mux-core.o diff --git a/drivers/mux/mux-core.c b/drivers/mux/mux-core.c new file mode 100644 index 000000000000..90b8995f07cb --- /dev/null +++ b/drivers/mux/mux-core.c @@ -0,0 +1,547 @@ +/* + * Multiplexer subsystem + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define pr_fmt(fmt) "mux-core: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * The idle-as-is "state" is not an actual state that may be selected, it + * only implies that the state should not be changed. So, use that state + * as indication that the cached state of the multiplexer is unknown. + */ +#define MUX_CACHE_UNKNOWN MUX_IDLE_AS_IS + +static struct class mux_class = { + .name = "mux", + .owner = THIS_MODULE, +}; + +static DEFINE_IDA(mux_ida); + +static int __init mux_init(void) +{ + ida_init(&mux_ida); + return class_register(&mux_class); +} + +static void __exit mux_exit(void) +{ + class_register(&mux_class); + ida_destroy(&mux_ida); +} + +static void mux_chip_release(struct device *dev) +{ + struct mux_chip *mux_chip = to_mux_chip(dev); + + ida_simple_remove(&mux_ida, mux_chip->id); + kfree(mux_chip); +} + +static struct device_type mux_type = { + .name = "mux-chip", + .release = mux_chip_release, +}; + +/** + * mux_chip_alloc() - Allocate a mux-chip. + * @dev: The parent device implementing the mux interface. + * @controllers: The number of mux controllers to allocate for this chip. + * @sizeof_priv: Size of extra memory area for private use by the caller. + * + * After allocating the mux-chip with the desired number of mux controllers + * but before registering the chip, the mux driver is required to configure + * the number of valid mux states in the mux_chip->mux[N].states members and + * the desired idle state in the returned mux_chip->mux[N].idle_state members. + * The default idle state is MUX_IDLE_AS_IS. The mux driver also needs to + * provide a pointer to the operations struct in the mux_chip->ops member + * before registering the mux-chip with mux_chip_register. + * + * Return: A pointer to the new mux-chip, or an ERR_PTR with a negative errno. + */ +struct mux_chip *mux_chip_alloc(struct device *dev, + unsigned int controllers, size_t sizeof_priv) +{ + struct mux_chip *mux_chip; + int i; + + if (WARN_ON(!dev || !controllers)) + return ERR_PTR(-EINVAL); + + mux_chip = kzalloc(sizeof(*mux_chip) + + controllers * sizeof(*mux_chip->mux) + + sizeof_priv, GFP_KERNEL); + if (!mux_chip) + return ERR_PTR(-ENOMEM); + + mux_chip->mux = (struct mux_control *)(mux_chip + 1); + mux_chip->dev.class = &mux_class; + mux_chip->dev.type = &mux_type; + mux_chip->dev.parent = dev; + mux_chip->dev.of_node = dev->of_node; + dev_set_drvdata(&mux_chip->dev, mux_chip); + + mux_chip->id = ida_simple_get(&mux_ida, 0, 0, GFP_KERNEL); + if (mux_chip->id < 0) { + int err = mux_chip->id; + + pr_err("muxchipX failed to get a device id\n"); + kfree(mux_chip); + return ERR_PTR(err); + } + dev_set_name(&mux_chip->dev, "muxchip%d", mux_chip->id); + + mux_chip->controllers = controllers; + for (i = 0; i < controllers; ++i) { + struct mux_control *mux = &mux_chip->mux[i]; + + mux->chip = mux_chip; + sema_init(&mux->lock, 1); + mux->cached_state = MUX_CACHE_UNKNOWN; + mux->idle_state = MUX_IDLE_AS_IS; + } + + device_initialize(&mux_chip->dev); + + return mux_chip; +} +EXPORT_SYMBOL_GPL(mux_chip_alloc); + +static int mux_control_set(struct mux_control *mux, int state) +{ + int ret = mux->chip->ops->set(mux, state); + + mux->cached_state = ret < 0 ? MUX_CACHE_UNKNOWN : state; + + return ret; +} + +/** + * mux_chip_register() - Register a mux-chip, thus readying the controllers + * for use. + * @mux_chip: The mux-chip to register. + * + * Do not retry registration of the same mux-chip on failure. You should + * instead put it away with mux_chip_free() and allocate a new one, if you + * for some reason would like to retry registration. + * + * Return: Zero on success or a negative errno on error. + */ +int mux_chip_register(struct mux_chip *mux_chip) +{ + int i; + int ret; + + for (i = 0; i < mux_chip->controllers; ++i) { + struct mux_control *mux = &mux_chip->mux[i]; + + if (mux->idle_state == mux->cached_state) + continue; + + ret = mux_control_set(mux, mux->idle_state); + if (ret < 0) { + dev_err(&mux_chip->dev, "unable to set idle state\n"); + return ret; + } + } + + ret = device_add(&mux_chip->dev); + if (ret < 0) + dev_err(&mux_chip->dev, + "device_add failed in %s: %d\n", __func__, ret); + return ret; +} +EXPORT_SYMBOL_GPL(mux_chip_register); + +/** + * mux_chip_unregister() - Take the mux-chip off-line. + * @mux_chip: The mux-chip to unregister. + * + * mux_chip_unregister() reverses the effects of mux_chip_register(). + * But not completely, you should not try to call mux_chip_register() + * on a mux-chip that has been registered before. + */ +void mux_chip_unregister(struct mux_chip *mux_chip) +{ + device_del(&mux_chip->dev); +} +EXPORT_SYMBOL_GPL(mux_chip_unregister); + +/** + * mux_chip_free() - Free the mux-chip for good. + * @mux_chip: The mux-chip to free. + * + * mux_chip_free() reverses the effects of mux_chip_alloc(). + */ +void mux_chip_free(struct mux_chip *mux_chip) +{ + if (!mux_chip) + return; + + put_device(&mux_chip->dev); +} +EXPORT_SYMBOL_GPL(mux_chip_free); + +static void devm_mux_chip_release(struct device *dev, void *res) +{ + struct mux_chip *mux_chip = *(struct mux_chip **)res; + + mux_chip_free(mux_chip); +} + +/** + * devm_mux_chip_alloc() - Resource-managed version of mux_chip_alloc(). + * @dev: The parent device implementing the mux interface. + * @controllers: The number of mux controllers to allocate for this chip. + * @sizeof_priv: Size of extra memory area for private use by the caller. + * + * See mux_chip_alloc() for more details. + * + * Return: A pointer to the new mux-chip, or an ERR_PTR with a negative errno. + */ +struct mux_chip *devm_mux_chip_alloc(struct device *dev, + unsigned int controllers, + size_t sizeof_priv) +{ + struct mux_chip **ptr, *mux_chip; + + ptr = devres_alloc(devm_mux_chip_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + mux_chip = mux_chip_alloc(dev, controllers, sizeof_priv); + if (IS_ERR(mux_chip)) { + devres_free(ptr); + return mux_chip; + } + + *ptr = mux_chip; + devres_add(dev, ptr); + + return mux_chip; +} +EXPORT_SYMBOL_GPL(devm_mux_chip_alloc); + +static void devm_mux_chip_reg_release(struct device *dev, void *res) +{ + struct mux_chip *mux_chip = *(struct mux_chip **)res; + + mux_chip_unregister(mux_chip); +} + +/** + * devm_mux_chip_register() - Resource-managed version mux_chip_register(). + * @dev: The parent device implementing the mux interface. + * @mux_chip: The mux-chip to register. + * + * See mux_chip_register() for more details. + * + * Return: Zero on success or a negative errno on error. + */ +int devm_mux_chip_register(struct device *dev, + struct mux_chip *mux_chip) +{ + struct mux_chip **ptr; + int res; + + ptr = devres_alloc(devm_mux_chip_reg_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + res = mux_chip_register(mux_chip); + if (res) { + devres_free(ptr); + return res; + } + + *ptr = mux_chip; + devres_add(dev, ptr); + + return res; +} +EXPORT_SYMBOL_GPL(devm_mux_chip_register); + +/** + * mux_control_states() - Query the number of multiplexer states. + * @mux: The mux-control to query. + * + * Return: The number of multiplexer states. + */ +unsigned int mux_control_states(struct mux_control *mux) +{ + return mux->states; +} +EXPORT_SYMBOL_GPL(mux_control_states); + +/* + * The mux->lock must be down when calling this function. + */ +static int __mux_control_select(struct mux_control *mux, int state) +{ + int ret; + + if (WARN_ON(state < 0 || state >= mux->states)) + return -EINVAL; + + if (mux->cached_state == state) + return 0; + + ret = mux_control_set(mux, state); + if (ret >= 0) + return 0; + + /* The mux update failed, try to revert if appropriate... */ + if (mux->idle_state != MUX_IDLE_AS_IS) + mux_control_set(mux, mux->idle_state); + + return ret; +} + +/** + * mux_control_select() - Select the given multiplexer state. + * @mux: The mux-control to request a change of state from. + * @state: The new requested state. + * + * On successfully selecting the mux-control state, it will be locked until + * there is a call to mux_control_deselect(). If the mux-control is already + * selected when mux_control_select() is called, the caller will be blocked + * until mux_control_deselect() is called (by someone else). + * + * Therefore, make sure to call mux_control_deselect() when the operation is + * complete and the mux-control is free for others to use, but do not call + * mux_control_deselect() if mux_control_select() fails. + * + * Return: 0 when the mux-control state has the requested state or a negative + * errno on error. + */ +int mux_control_select(struct mux_control *mux, unsigned int state) +{ + int ret; + + ret = down_killable(&mux->lock); + if (ret < 0) + return ret; + + ret = __mux_control_select(mux, state); + + if (ret < 0) + up(&mux->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(mux_control_select); + +/** + * mux_control_try_select() - Try to select the given multiplexer state. + * @mux: The mux-control to request a change of state from. + * @state: The new requested state. + * + * On successfully selecting the mux-control state, it will be locked until + * mux_control_deselect() called. + * + * Therefore, make sure to call mux_control_deselect() when the operation is + * complete and the mux-control is free for others to use, but do not call + * mux_control_deselect() if mux_control_try_select() fails. + * + * Return: 0 when the mux-control state has the requested state or a negative + * errno on error. Specifically -EBUSY if the mux-control is contended. + */ +int mux_control_try_select(struct mux_control *mux, unsigned int state) +{ + int ret; + + if (down_trylock(&mux->lock)) + return -EBUSY; + + ret = __mux_control_select(mux, state); + + if (ret < 0) + up(&mux->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(mux_control_try_select); + +/** + * mux_control_deselect() - Deselect the previously selected multiplexer state. + * @mux: The mux-control to deselect. + * + * It is required that a single call is made to mux_control_deselect() for + * each and every successful call made to either of mux_control_select() or + * mux_control_try_select(). + * + * Return: 0 on success and a negative errno on error. An error can only + * occur if the mux has an idle state. Note that even if an error occurs, the + * mux-control is unlocked and is thus free for the next access. + */ +int mux_control_deselect(struct mux_control *mux) +{ + int ret = 0; + + if (mux->idle_state != MUX_IDLE_AS_IS && + mux->idle_state != mux->cached_state) + ret = mux_control_set(mux, mux->idle_state); + + up(&mux->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(mux_control_deselect); + +static int of_dev_node_match(struct device *dev, const void *data) +{ + return dev->of_node == data; +} + +static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np) +{ + struct device *dev; + + dev = class_find_device(&mux_class, NULL, np, of_dev_node_match); + + return dev ? to_mux_chip(dev) : NULL; +} + +/** + * mux_control_get() - Get the mux-control for a device. + * @dev: The device that needs a mux-control. + * @mux_name: The name identifying the mux-control. + * + * Return: A pointer to the mux-control, or an ERR_PTR with a negative errno. + */ +struct mux_control *mux_control_get(struct device *dev, const char *mux_name) +{ + struct device_node *np = dev->of_node; + struct of_phandle_args args; + struct mux_chip *mux_chip; + unsigned int controller; + int index = 0; + int ret; + + if (mux_name) { + index = of_property_match_string(np, "mux-control-names", + mux_name); + if (index < 0) { + dev_err(dev, "mux controller '%s' not found\n", + mux_name); + return ERR_PTR(index); + } + } + + ret = of_parse_phandle_with_args(np, + "mux-controls", "#mux-control-cells", + index, &args); + if (ret) { + dev_err(dev, "%s: failed to get mux-control %s(%i)\n", + np->full_name, mux_name ?: "", index); + return ERR_PTR(ret); + } + + mux_chip = of_find_mux_chip_by_node(args.np); + of_node_put(args.np); + if (!mux_chip) + return ERR_PTR(-EPROBE_DEFER); + + if (args.args_count > 1 || + (!args.args_count && (mux_chip->controllers > 1))) { + dev_err(dev, "%s: wrong #mux-control-cells for %s\n", + np->full_name, args.np->full_name); + return ERR_PTR(-EINVAL); + } + + controller = 0; + if (args.args_count) + controller = args.args[0]; + + if (controller >= mux_chip->controllers) { + dev_err(dev, "%s: bad mux controller %u specified in %s\n", + np->full_name, controller, args.np->full_name); + return ERR_PTR(-EINVAL); + } + + get_device(&mux_chip->dev); + return &mux_chip->mux[controller]; +} +EXPORT_SYMBOL_GPL(mux_control_get); + +/** + * mux_control_put() - Put away the mux-control for good. + * @mux: The mux-control to put away. + * + * mux_control_put() reverses the effects of mux_control_get(). + */ +void mux_control_put(struct mux_control *mux) +{ + put_device(&mux->chip->dev); +} +EXPORT_SYMBOL_GPL(mux_control_put); + +static void devm_mux_control_release(struct device *dev, void *res) +{ + struct mux_control *mux = *(struct mux_control **)res; + + mux_control_put(mux); +} + +/** + * devm_mux_control_get() - Get the mux-control for a device, with resource + * management. + * @dev: The device that needs a mux-control. + * @mux_name: The name identifying the mux-control. + * + * Return: Pointer to the mux-control, or an ERR_PTR with a negative errno. + */ +struct mux_control *devm_mux_control_get(struct device *dev, + const char *mux_name) +{ + struct mux_control **ptr, *mux; + + ptr = devres_alloc(devm_mux_control_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + mux = mux_control_get(dev, mux_name); + if (IS_ERR(mux)) { + devres_free(ptr); + return mux; + } + + *ptr = mux; + devres_add(dev, ptr); + + return mux; +} +EXPORT_SYMBOL_GPL(devm_mux_control_get); + +/* + * Using subsys_initcall instead of module_init here to try to ensure - for + * the non-modular case - that the subsystem is initialized when mux consumers + * and mux controllers start to use it. + * For the modular case, the ordering is ensured with module dependencies. + */ +subsys_initcall(mux_init); +module_exit(mux_exit); + +MODULE_DESCRIPTION("Multiplexer subsystem"); +MODULE_AUTHOR("Peter Rosin "); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h new file mode 100644 index 000000000000..5577e1b773c4 --- /dev/null +++ b/include/linux/mux/consumer.h @@ -0,0 +1,32 @@ +/* + * mux/consumer.h - definitions for the multiplexer consumer interface + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _LINUX_MUX_CONSUMER_H +#define _LINUX_MUX_CONSUMER_H + +struct device; +struct mux_control; + +unsigned int mux_control_states(struct mux_control *mux); +int __must_check mux_control_select(struct mux_control *mux, + unsigned int state); +int __must_check mux_control_try_select(struct mux_control *mux, + unsigned int state); +int mux_control_deselect(struct mux_control *mux); + +struct mux_control *mux_control_get(struct device *dev, const char *mux_name); +void mux_control_put(struct mux_control *mux); + +struct mux_control *devm_mux_control_get(struct device *dev, + const char *mux_name); + +#endif /* _LINUX_MUX_CONSUMER_H */ diff --git a/include/linux/mux/driver.h b/include/linux/mux/driver.h new file mode 100644 index 000000000000..35c3579c3304 --- /dev/null +++ b/include/linux/mux/driver.h @@ -0,0 +1,108 @@ +/* + * mux/driver.h - definitions for the multiplexer driver interface + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _LINUX_MUX_DRIVER_H +#define _LINUX_MUX_DRIVER_H + +#include +#include +#include + +struct mux_chip; +struct mux_control; + +/** + * struct mux_control_ops - Mux controller operations for a mux chip. + * @set: Set the state of the given mux controller. + */ +struct mux_control_ops { + int (*set)(struct mux_control *mux, int state); +}; + +/** + * struct mux_control - Represents a mux controller. + * @lock: Protects the mux controller state. + * @chip: The mux chip that is handling this mux controller. + * @cached_state: The current mux controller state, or -1 if none. + * @states: The number of mux controller states. + * @idle_state: The mux controller state to use when inactive, or one + * of MUX_IDLE_AS_IS and MUX_IDLE_DISCONNECT. + * + * Mux drivers may only change @states and @idle_state, and may only do so + * between allocation and registration of the mux controller. Specifically, + * @cached_state is internal to the mux core and should never be written by + * mux drivers. + */ +struct mux_control { + struct semaphore lock; /* protects the state of the mux */ + + struct mux_chip *chip; + int cached_state; + + unsigned int states; + int idle_state; +}; + +/** + * struct mux_chip - Represents a chip holding mux controllers. + * @controllers: Number of mux controllers handled by the chip. + * @mux: Array of mux controllers that are handled. + * @dev: Device structure. + * @id: Used to identify the device internally. + * @ops: Mux controller operations. + */ +struct mux_chip { + unsigned int controllers; + struct mux_control *mux; + struct device dev; + int id; + + const struct mux_control_ops *ops; +}; + +#define to_mux_chip(x) container_of((x), struct mux_chip, dev) + +/** + * mux_chip_priv() - Get the extra memory reserved by mux_chip_alloc(). + * @mux_chip: The mux-chip to get the private memory from. + * + * Return: Pointer to the private memory reserved by the allocator. + */ +static inline void *mux_chip_priv(struct mux_chip *mux_chip) +{ + return &mux_chip->mux[mux_chip->controllers]; +} + +struct mux_chip *mux_chip_alloc(struct device *dev, + unsigned int controllers, size_t sizeof_priv); +int mux_chip_register(struct mux_chip *mux_chip); +void mux_chip_unregister(struct mux_chip *mux_chip); +void mux_chip_free(struct mux_chip *mux_chip); + +struct mux_chip *devm_mux_chip_alloc(struct device *dev, + unsigned int controllers, + size_t sizeof_priv); +int devm_mux_chip_register(struct device *dev, struct mux_chip *mux_chip); + +/** + * mux_control_get_index() - Get the index of the given mux controller + * @mux: The mux-control to get the index for. + * + * Return: The index of the mux controller within the mux chip the mux + * controller is a part of. + */ +static inline unsigned int mux_control_get_index(struct mux_control *mux) +{ + return mux - mux->chip->mux; +} + +#endif /* _LINUX_MUX_DRIVER_H */ -- cgit v1.2.3 From 2c089f08e0de2a784106272c6454ce389fe12376 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:07 +0200 Subject: mux: gpio: add mux controller driver for gpio based multiplexers The driver builds a single multiplexer controller using a number of gpio pins. For N pins, there will be 2^N possible multiplexer states. The GPIO pins can be connected (by the hardware) to several multiplexers, which in that case will be operated in parallel. Reviewed-by: Jonathan Cameron Signed-off-by: Peter Rosin Reviewed-by: Philipp Zabel Signed-off-by: Greg Kroah-Hartman --- drivers/mux/Kconfig | 18 ++++++++ drivers/mux/Makefile | 1 + drivers/mux/mux-gpio.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 133 insertions(+) create mode 100644 drivers/mux/mux-gpio.c diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig index 23ab2cde83b1..738670aaecb7 100644 --- a/drivers/mux/Kconfig +++ b/drivers/mux/Kconfig @@ -14,3 +14,21 @@ menuconfig MULTIPLEXER To compile the subsystem as a module, choose M here: the module will be called mux-core. + +if MULTIPLEXER + +config MUX_GPIO + tristate "GPIO-controlled Multiplexer" + depends on GPIOLIB || COMPILE_TEST + help + GPIO-controlled Multiplexer controller. + + The driver builds a single multiplexer controller using a number + of gpio pins. For N pins, there will be 2^N possible multiplexer + states. The GPIO pins can be connected (by the hardware) to several + multiplexers, which in that case will be operated in parallel. + + To compile the driver as a module, choose M here: the module will + be called mux-gpio. + +endif diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile index 09f0299e109d..bb16953f6290 100644 --- a/drivers/mux/Makefile +++ b/drivers/mux/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_MULTIPLEXER) += mux-core.o +obj-$(CONFIG_MUX_GPIO) += mux-gpio.o diff --git a/drivers/mux/mux-gpio.c b/drivers/mux/mux-gpio.c new file mode 100644 index 000000000000..468bf1709606 --- /dev/null +++ b/drivers/mux/mux-gpio.c @@ -0,0 +1,114 @@ +/* + * GPIO-controlled multiplexer driver + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include + +struct mux_gpio { + struct gpio_descs *gpios; + int *val; +}; + +static int mux_gpio_set(struct mux_control *mux, int state) +{ + struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip); + int i; + + for (i = 0; i < mux_gpio->gpios->ndescs; i++) + mux_gpio->val[i] = (state >> i) & 1; + + gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs, + mux_gpio->gpios->desc, + mux_gpio->val); + + return 0; +} + +static const struct mux_control_ops mux_gpio_ops = { + .set = mux_gpio_set, +}; + +static const struct of_device_id mux_gpio_dt_ids[] = { + { .compatible = "gpio-mux", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mux_gpio_dt_ids); + +static int mux_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mux_chip *mux_chip; + struct mux_gpio *mux_gpio; + int pins; + s32 idle_state; + int ret; + + pins = gpiod_count(dev, "mux"); + if (pins < 0) + return pins; + + mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) + + pins * sizeof(*mux_gpio->val)); + if (IS_ERR(mux_chip)) + return PTR_ERR(mux_chip); + + mux_gpio = mux_chip_priv(mux_chip); + mux_gpio->val = (int *)(mux_gpio + 1); + mux_chip->ops = &mux_gpio_ops; + + mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW); + if (IS_ERR(mux_gpio->gpios)) { + ret = PTR_ERR(mux_gpio->gpios); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to get gpios\n"); + return ret; + } + WARN_ON(pins != mux_gpio->gpios->ndescs); + mux_chip->mux->states = 1 << pins; + + ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state); + if (ret >= 0 && idle_state != MUX_IDLE_AS_IS) { + if (idle_state < 0 || idle_state >= mux_chip->mux->states) { + dev_err(dev, "invalid idle-state %u\n", idle_state); + return -EINVAL; + } + + mux_chip->mux->idle_state = idle_state; + } + + ret = devm_mux_chip_register(dev, mux_chip); + if (ret < 0) + return ret; + + dev_info(dev, "%u-way mux-controller registered\n", + mux_chip->mux->states); + + return 0; +} + +static struct platform_driver mux_gpio_driver = { + .driver = { + .name = "gpio-mux", + .of_match_table = of_match_ptr(mux_gpio_dt_ids), + }, + .probe = mux_gpio_probe, +}; +module_platform_driver(mux_gpio_driver); + +MODULE_DESCRIPTION("GPIO-controlled multiplexer driver"); +MODULE_AUTHOR("Peter Rosin "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From 8a848e754956dcbc35cd2fcf417f66dafa020c9e Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:08 +0200 Subject: iio: inkern: api for manipulating ext_info of iio channels Extend the inkern api with functions for reading and writing ext_info of iio channels. Acked-by: Jonathan Cameron Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- drivers/iio/inkern.c | 60 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/iio/consumer.h | 37 +++++++++++++++++++++++++++ 2 files changed, 97 insertions(+) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 7a13535dc3e9..8292ad4435ea 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -869,3 +869,63 @@ err_unlock: return ret; } EXPORT_SYMBOL_GPL(iio_write_channel_raw); + +unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan) +{ + const struct iio_chan_spec_ext_info *ext_info; + unsigned int i = 0; + + if (!chan->channel->ext_info) + return i; + + for (ext_info = chan->channel->ext_info; ext_info->name; ext_info++) + ++i; + + return i; +} +EXPORT_SYMBOL_GPL(iio_get_channel_ext_info_count); + +static const struct iio_chan_spec_ext_info *iio_lookup_ext_info( + const struct iio_channel *chan, + const char *attr) +{ + const struct iio_chan_spec_ext_info *ext_info; + + if (!chan->channel->ext_info) + return NULL; + + for (ext_info = chan->channel->ext_info; ext_info->name; ++ext_info) { + if (!strcmp(attr, ext_info->name)) + return ext_info; + } + + return NULL; +} + +ssize_t iio_read_channel_ext_info(struct iio_channel *chan, + const char *attr, char *buf) +{ + const struct iio_chan_spec_ext_info *ext_info; + + ext_info = iio_lookup_ext_info(chan, attr); + if (!ext_info) + return -EINVAL; + + return ext_info->read(chan->indio_dev, ext_info->private, + chan->channel, buf); +} +EXPORT_SYMBOL_GPL(iio_read_channel_ext_info); + +ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr, + const char *buf, size_t len) +{ + const struct iio_chan_spec_ext_info *ext_info; + + ext_info = iio_lookup_ext_info(chan, attr); + if (!ext_info) + return -EINVAL; + + return ext_info->write(chan->indio_dev, ext_info->private, + chan->channel, buf, len); +} +EXPORT_SYMBOL_GPL(iio_write_channel_ext_info); diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 47eeec3218b5..5e347a9805fd 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -312,4 +312,41 @@ int iio_read_channel_scale(struct iio_channel *chan, int *val, int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, int *processed, unsigned int scale); +/** + * iio_get_channel_ext_info_count() - get number of ext_info attributes + * connected to the channel. + * @chan: The channel being queried + * + * Returns the number of ext_info attributes + */ +unsigned int iio_get_channel_ext_info_count(struct iio_channel *chan); + +/** + * iio_read_channel_ext_info() - read ext_info attribute from a given channel + * @chan: The channel being queried. + * @attr: The ext_info attribute to read. + * @buf: Where to store the attribute value. Assumed to hold + * at least PAGE_SIZE bytes. + * + * Returns the number of bytes written to buf (perhaps w/o zero termination; + * it need not even be a string), or an error code. + */ +ssize_t iio_read_channel_ext_info(struct iio_channel *chan, + const char *attr, char *buf); + +/** + * iio_write_channel_ext_info() - write ext_info attribute from a given channel + * @chan: The channel being queried. + * @attr: The ext_info attribute to read. + * @buf: The new attribute value. Strings needs to be zero- + * terminated, but the terminator should not be included + * in the below len. + * @len: The size of the new attribute value. + * + * Returns the number of accepted bytes, which should be the same as len. + * An error code can also be returned. + */ +ssize_t iio_write_channel_ext_info(struct iio_channel *chan, const char *attr, + const char *buf, size_t len); + #endif -- cgit v1.2.3 From a36954f58f6c01cb8b19c6424b549464c9495e72 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:09 +0200 Subject: dt-bindings: iio: io-channel-mux: document io-channel-mux bindings Describe how a multiplexer can be used to select which signal is fed to an io-channel. Acked-by: Jonathan Cameron Acked-by: Rob Herring Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- .../bindings/iio/multiplexer/io-channel-mux.txt | 39 ++++++++++++++++++++++ MAINTAINERS | 6 ++++ 2 files changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt diff --git a/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt new file mode 100644 index 000000000000..c82794002595 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt @@ -0,0 +1,39 @@ +I/O channel multiplexer bindings + +If a multiplexer is used to select which hardware signal is fed to +e.g. an ADC channel, these bindings describe that situation. + +Required properties: +- compatible : "io-channel-mux" +- io-channels : Channel node of the parent channel that has multiplexed + input. +- io-channel-names : Should be "parent". +- #address-cells = <1>; +- #size-cells = <0>; +- mux-controls : Mux controller node to use for operating the mux +- channels : List of strings, labeling the mux controller states. + +For each non-empty string in the channels property, an io-channel will +be created. The number of this io-channel is the same as the index into +the list of strings in the channels property, and also matches the mux +controller state. The mux controller state is described in +../mux/mux-controller.txt + +Example: + mux: mux-controller { + compatible = "mux-gpio"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + + channels = "sync", "in", "system-regulator"; + }; diff --git a/MAINTAINERS b/MAINTAINERS index a507bb4316ce..db2a9eb3d9e4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6481,6 +6481,12 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector F: Documentation/devicetree/bindings/iio/adc/envelope-detector.txt F: drivers/iio/adc/envelope-detector.c +IIO MULTIPLEXER +M: Peter Rosin +L: linux-iio@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt + IIO SUBSYSTEM AND DRIVERS M: Jonathan Cameron R: Hartmut Knaack -- cgit v1.2.3 From 7ba9df54b09117c0a062f9eac4a36b0e70893387 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:10 +0200 Subject: iio: multiplexer: new iio category and iio-mux driver When a multiplexer changes how an iio device behaves (for example by feeding different signals to an ADC), this driver can be used to create one virtual iio channel for each multiplexer state. Depends on the generic multiplexer subsystem. Cache any ext_info values from the parent iio channel, creating a private copy of the ext_info attributes for each multiplexer state/channel. Reviewed-by: Jonathan Cameron Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- MAINTAINERS | 1 + drivers/iio/Kconfig | 1 + drivers/iio/Makefile | 1 + drivers/iio/multiplexer/Kconfig | 18 ++ drivers/iio/multiplexer/Makefile | 6 + drivers/iio/multiplexer/iio-mux.c | 459 ++++++++++++++++++++++++++++++++++++++ 6 files changed, 486 insertions(+) create mode 100644 drivers/iio/multiplexer/Kconfig create mode 100644 drivers/iio/multiplexer/Makefile create mode 100644 drivers/iio/multiplexer/iio-mux.c diff --git a/MAINTAINERS b/MAINTAINERS index db2a9eb3d9e4..e3f44fdb14eb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6486,6 +6486,7 @@ M: Peter Rosin L: linux-iio@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt +F: drivers/iio/multiplexer/iio-mux.c IIO SUBSYSTEM AND DRIVERS M: Jonathan Cameron diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index a918270d6f54..b3c8c6ef0dff 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -83,6 +83,7 @@ source "drivers/iio/humidity/Kconfig" source "drivers/iio/imu/Kconfig" source "drivers/iio/light/Kconfig" source "drivers/iio/magnetometer/Kconfig" +source "drivers/iio/multiplexer/Kconfig" source "drivers/iio/orientation/Kconfig" if IIO_TRIGGER source "drivers/iio/trigger/Kconfig" diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile index 33fa4026f92c..93c769cd99bf 100644 --- a/drivers/iio/Makefile +++ b/drivers/iio/Makefile @@ -28,6 +28,7 @@ obj-y += humidity/ obj-y += imu/ obj-y += light/ obj-y += magnetometer/ +obj-y += multiplexer/ obj-y += orientation/ obj-y += potentiometer/ obj-y += potentiostat/ diff --git a/drivers/iio/multiplexer/Kconfig b/drivers/iio/multiplexer/Kconfig new file mode 100644 index 000000000000..735a7b0e6fd8 --- /dev/null +++ b/drivers/iio/multiplexer/Kconfig @@ -0,0 +1,18 @@ +# +# Multiplexer drivers +# +# When adding new entries keep the list in alphabetical order + +menu "Multiplexers" + +config IIO_MUX + tristate "IIO multiplexer driver" + select MULTIPLEXER + depends on OF || COMPILE_TEST + help + Say yes here to build support for the IIO multiplexer. + + To compile this driver as a module, choose M here: the + module will be called iio-mux. + +endmenu diff --git a/drivers/iio/multiplexer/Makefile b/drivers/iio/multiplexer/Makefile new file mode 100644 index 000000000000..68be3c4abd07 --- /dev/null +++ b/drivers/iio/multiplexer/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for industrial I/O multiplexer drivers +# + +# When adding new entries keep the list in alphabetical order +obj-$(CONFIG_IIO_MUX) += iio-mux.o diff --git a/drivers/iio/multiplexer/iio-mux.c b/drivers/iio/multiplexer/iio-mux.c new file mode 100644 index 000000000000..37ba007f8dca --- /dev/null +++ b/drivers/iio/multiplexer/iio-mux.c @@ -0,0 +1,459 @@ +/* + * IIO multiplexer driver + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct mux_ext_info_cache { + char *data; + ssize_t size; +}; + +struct mux_child { + struct mux_ext_info_cache *ext_info_cache; +}; + +struct mux { + int cached_state; + struct mux_control *control; + struct iio_channel *parent; + struct iio_dev *indio_dev; + struct iio_chan_spec *chan; + struct iio_chan_spec_ext_info *ext_info; + struct mux_child *child; +}; + +static int iio_mux_select(struct mux *mux, int idx) +{ + struct mux_child *child = &mux->child[idx]; + struct iio_chan_spec const *chan = &mux->chan[idx]; + int ret; + int i; + + ret = mux_control_select(mux->control, chan->channel); + if (ret < 0) { + mux->cached_state = -1; + return ret; + } + + if (mux->cached_state == chan->channel) + return 0; + + if (chan->ext_info) { + for (i = 0; chan->ext_info[i].name; ++i) { + const char *attr = chan->ext_info[i].name; + struct mux_ext_info_cache *cache; + + cache = &child->ext_info_cache[i]; + + if (cache->size < 0) + continue; + + ret = iio_write_channel_ext_info(mux->parent, attr, + cache->data, + cache->size); + + if (ret < 0) { + mux_control_deselect(mux->control); + mux->cached_state = -1; + return ret; + } + } + } + mux->cached_state = chan->channel; + + return 0; +} + +static void iio_mux_deselect(struct mux *mux) +{ + mux_control_deselect(mux->control); +} + +static int mux_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct mux *mux = iio_priv(indio_dev); + int idx = chan - mux->chan; + int ret; + + ret = iio_mux_select(mux, idx); + if (ret < 0) + return ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_read_channel_raw(mux->parent, val); + break; + + case IIO_CHAN_INFO_SCALE: + ret = iio_read_channel_scale(mux->parent, val, val2); + break; + + default: + ret = -EINVAL; + } + + iio_mux_deselect(mux); + + return ret; +} + +static int mux_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct mux *mux = iio_priv(indio_dev); + int idx = chan - mux->chan; + int ret; + + ret = iio_mux_select(mux, idx); + if (ret < 0) + return ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + *type = IIO_VAL_INT; + ret = iio_read_avail_channel_raw(mux->parent, vals, length); + break; + + default: + ret = -EINVAL; + } + + iio_mux_deselect(mux); + + return ret; +} + +static int mux_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct mux *mux = iio_priv(indio_dev); + int idx = chan - mux->chan; + int ret; + + ret = iio_mux_select(mux, idx); + if (ret < 0) + return ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_write_channel_raw(mux->parent, val); + break; + + default: + ret = -EINVAL; + } + + iio_mux_deselect(mux); + + return ret; +} + +static const struct iio_info mux_info = { + .read_raw = mux_read_raw, + .read_avail = mux_read_avail, + .write_raw = mux_write_raw, + .driver_module = THIS_MODULE, +}; + +static ssize_t mux_read_ext_info(struct iio_dev *indio_dev, uintptr_t private, + struct iio_chan_spec const *chan, char *buf) +{ + struct mux *mux = iio_priv(indio_dev); + int idx = chan - mux->chan; + ssize_t ret; + + ret = iio_mux_select(mux, idx); + if (ret < 0) + return ret; + + ret = iio_read_channel_ext_info(mux->parent, + mux->ext_info[private].name, + buf); + + iio_mux_deselect(mux); + + return ret; +} + +static ssize_t mux_write_ext_info(struct iio_dev *indio_dev, uintptr_t private, + struct iio_chan_spec const *chan, + const char *buf, size_t len) +{ + struct device *dev = indio_dev->dev.parent; + struct mux *mux = iio_priv(indio_dev); + int idx = chan - mux->chan; + char *new; + ssize_t ret; + + if (len >= PAGE_SIZE) + return -EINVAL; + + ret = iio_mux_select(mux, idx); + if (ret < 0) + return ret; + + new = devm_kmemdup(dev, buf, len + 1, GFP_KERNEL); + if (!new) { + iio_mux_deselect(mux); + return -ENOMEM; + } + + new[len] = 0; + + ret = iio_write_channel_ext_info(mux->parent, + mux->ext_info[private].name, + buf, len); + if (ret < 0) { + iio_mux_deselect(mux); + devm_kfree(dev, new); + return ret; + } + + devm_kfree(dev, mux->child[idx].ext_info_cache[private].data); + mux->child[idx].ext_info_cache[private].data = new; + mux->child[idx].ext_info_cache[private].size = len; + + iio_mux_deselect(mux); + + return ret; +} + +static int mux_configure_channel(struct device *dev, struct mux *mux, + u32 state, const char *label, int idx) +{ + struct mux_child *child = &mux->child[idx]; + struct iio_chan_spec *chan = &mux->chan[idx]; + struct iio_chan_spec const *pchan = mux->parent->channel; + char *page = NULL; + int num_ext_info; + int i; + int ret; + + chan->indexed = 1; + chan->output = pchan->output; + chan->datasheet_name = label; + chan->ext_info = mux->ext_info; + + ret = iio_get_channel_type(mux->parent, &chan->type); + if (ret < 0) { + dev_err(dev, "failed to get parent channel type\n"); + return ret; + } + + if (iio_channel_has_info(pchan, IIO_CHAN_INFO_RAW)) + chan->info_mask_separate |= BIT(IIO_CHAN_INFO_RAW); + if (iio_channel_has_info(pchan, IIO_CHAN_INFO_SCALE)) + chan->info_mask_separate |= BIT(IIO_CHAN_INFO_SCALE); + + if (iio_channel_has_available(pchan, IIO_CHAN_INFO_RAW)) + chan->info_mask_separate_available |= BIT(IIO_CHAN_INFO_RAW); + + if (state >= mux_control_states(mux->control)) { + dev_err(dev, "too many channels\n"); + return -EINVAL; + } + + chan->channel = state; + + num_ext_info = iio_get_channel_ext_info_count(mux->parent); + if (num_ext_info) { + page = devm_kzalloc(dev, PAGE_SIZE, GFP_KERNEL); + if (!page) + return -ENOMEM; + } + child->ext_info_cache = devm_kzalloc(dev, + sizeof(*child->ext_info_cache) * + num_ext_info, GFP_KERNEL); + for (i = 0; i < num_ext_info; ++i) { + child->ext_info_cache[i].size = -1; + + if (!pchan->ext_info[i].write) + continue; + if (!pchan->ext_info[i].read) + continue; + + ret = iio_read_channel_ext_info(mux->parent, + mux->ext_info[i].name, + page); + if (ret < 0) { + dev_err(dev, "failed to get ext_info '%s'\n", + pchan->ext_info[i].name); + return ret; + } + if (ret >= PAGE_SIZE) { + dev_err(dev, "too large ext_info '%s'\n", + pchan->ext_info[i].name); + return -EINVAL; + } + + child->ext_info_cache[i].data = devm_kmemdup(dev, page, ret + 1, + GFP_KERNEL); + child->ext_info_cache[i].data[ret] = 0; + child->ext_info_cache[i].size = ret; + } + + if (page) + devm_kfree(dev, page); + + return 0; +} + +/* + * Same as of_property_for_each_string(), but also keeps track of the + * index of each string. + */ +#define of_property_for_each_string_index(np, propname, prop, s, i) \ + for (prop = of_find_property(np, propname, NULL), \ + s = of_prop_next_string(prop, NULL), \ + i = 0; \ + s; \ + s = of_prop_next_string(prop, s), \ + i++) + +static int mux_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = pdev->dev.of_node; + struct iio_dev *indio_dev; + struct iio_channel *parent; + struct mux *mux; + struct property *prop; + const char *label; + u32 state; + int sizeof_ext_info; + int children; + int sizeof_priv; + int i; + int ret; + + if (!np) + return -ENODEV; + + parent = devm_iio_channel_get(dev, "parent"); + if (IS_ERR(parent)) { + if (PTR_ERR(parent) != -EPROBE_DEFER) + dev_err(dev, "failed to get parent channel\n"); + return PTR_ERR(parent); + } + + sizeof_ext_info = iio_get_channel_ext_info_count(parent); + if (sizeof_ext_info) { + sizeof_ext_info += 1; /* one extra entry for the sentinel */ + sizeof_ext_info *= sizeof(*mux->ext_info); + } + + children = 0; + of_property_for_each_string(np, "channels", prop, label) { + if (*label) + children++; + } + if (children <= 0) { + dev_err(dev, "not even a single child\n"); + return -EINVAL; + } + + sizeof_priv = sizeof(*mux); + sizeof_priv += sizeof(*mux->child) * children; + sizeof_priv += sizeof(*mux->chan) * children; + sizeof_priv += sizeof_ext_info; + + indio_dev = devm_iio_device_alloc(dev, sizeof_priv); + if (!indio_dev) + return -ENOMEM; + + mux = iio_priv(indio_dev); + mux->child = (struct mux_child *)(mux + 1); + mux->chan = (struct iio_chan_spec *)(mux->child + children); + + platform_set_drvdata(pdev, indio_dev); + + mux->parent = parent; + mux->cached_state = -1; + + indio_dev->name = dev_name(dev); + indio_dev->dev.parent = dev; + indio_dev->info = &mux_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = mux->chan; + indio_dev->num_channels = children; + if (sizeof_ext_info) { + mux->ext_info = devm_kmemdup(dev, + parent->channel->ext_info, + sizeof_ext_info, GFP_KERNEL); + if (!mux->ext_info) + return -ENOMEM; + + for (i = 0; mux->ext_info[i].name; ++i) { + if (parent->channel->ext_info[i].read) + mux->ext_info[i].read = mux_read_ext_info; + if (parent->channel->ext_info[i].write) + mux->ext_info[i].write = mux_write_ext_info; + mux->ext_info[i].private = i; + } + } + + mux->control = devm_mux_control_get(dev, NULL); + if (IS_ERR(mux->control)) { + if (PTR_ERR(mux->control) != -EPROBE_DEFER) + dev_err(dev, "failed to get control-mux\n"); + return PTR_ERR(mux->control); + } + + i = 0; + of_property_for_each_string_index(np, "channels", prop, label, state) { + if (!*label) + continue; + + ret = mux_configure_channel(dev, mux, state, label, i++); + if (ret < 0) + return ret; + } + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) { + dev_err(dev, "failed to register iio device\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id mux_match[] = { + { .compatible = "io-channel-mux" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mux_match); + +static struct platform_driver mux_driver = { + .probe = mux_probe, + .driver = { + .name = "iio-mux", + .of_match_table = mux_match, + }, +}; +module_platform_driver(mux_driver); + +MODULE_DESCRIPTION("IIO multiplexer driver"); +MODULE_AUTHOR("Peter Rosin "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From 1821355188f14430fdcc75f6f6062c7cbae9e719 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:11 +0200 Subject: dt-bindings: i2c: i2c-mux: document general purpose i2c-mux bindings Describe how a general purpose multiplexer controller is used to mux an i2c bus. Acked-by: Jonathan Cameron Reviewed-by: Rob Herring Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- .../devicetree/bindings/i2c/i2c-mux-gpmux.txt | 99 ++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt new file mode 100644 index 000000000000..2907dab56298 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt @@ -0,0 +1,99 @@ +General Purpose I2C Bus Mux + +This binding describes an I2C bus multiplexer that uses a mux controller +from the mux subsystem to route the I2C signals. + + .-----. .-----. + | dev | | dev | + .------------. '-----' '-----' + | SoC | | | + | | .--------+--------' + | .------. | .------+ child bus A, on MUX value set to 0 + | | I2C |-|--| Mux | + | '------' | '--+---+ child bus B, on MUX value set to 1 + | .------. | | '----------+--------+--------. + | | MUX- | | | | | | + | | Ctrl |-|-----+ .-----. .-----. .-----. + | '------' | | dev | | dev | | dev | + '------------' '-----' '-----' '-----' + +Required properties: +- compatible: i2c-mux +- i2c-parent: The phandle of the I2C bus that this multiplexer's master-side + port is connected to. +- mux-controls: The phandle of the mux controller to use for operating the + mux. +* Standard I2C mux properties. See i2c-mux.txt in this directory. +* I2C child bus nodes. See i2c-mux.txt in this directory. The sub-bus number + is also the mux-controller state described in ../mux/mux-controller.txt + +Optional properties: +- mux-locked: If present, explicitly allow unrelated I2C transactions on the + parent I2C adapter at these times: + + during setup of the multiplexer + + between setup of the multiplexer and the child bus I2C transaction + + between the child bus I2C transaction and releasing of the multiplexer + + during releasing of the multiplexer + However, I2C transactions to devices behind all I2C multiplexers connected + to the same parent adapter that this multiplexer is connected to are blocked + for the full duration of the complete multiplexed I2C transaction (i.e. + including the times covered by the above list). + If mux-locked is not present, the multiplexer is assumed to be parent-locked. + This means that no unrelated I2C transactions are allowed on the parent I2C + adapter for the complete multiplexed I2C transaction. + The properties of mux-locked and parent-locked multiplexers are discussed + in more detail in Documentation/i2c/i2c-topology. + +For each i2c child node, an I2C child bus will be created. They will +be numbered based on their order in the device tree. + +Whenever an access is made to a device on a child bus, the value set +in the relevant node's reg property will be set as the state in the +mux controller. + +Example: + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + i2c-mux { + compatible = "i2c-mux"; + mux-locked; + i2c-parent = <&i2c1>; + + mux-controls = <&mux>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@1 { + reg = <1>; + #address-cells = <1>; + #size-cells = <0>; + + ssd1307: oled@3c { + compatible = "solomon,ssd1307fb-i2c"; + reg = <0x3c>; + pwms = <&pwm 4 3000>; + reset-gpios = <&gpio2 7 1>; + reset-active-low; + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + pca9555: pca9555@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + }; -- cgit v1.2.3 From ac8498f0ce5301c51c32607af5a318a7e05f45c5 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:12 +0200 Subject: i2c: i2c-mux-gpmux: new driver This is a general purpose i2c mux that uses a multiplexer controlled by the multiplexer subsystem to do the muxing. The user can select if the mux is to be mux-locked and parent-locked as described in Documentation/i2c/i2c-topology. Acked-by: Jonathan Cameron Acked-by: Wolfram Sang Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/muxes/Kconfig | 13 +++ drivers/i2c/muxes/Makefile | 1 + drivers/i2c/muxes/i2c-mux-gpmux.c | 173 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 drivers/i2c/muxes/i2c-mux-gpmux.c diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index 1e160fc37ecc..2c64d0e0740f 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -30,6 +30,19 @@ config I2C_MUX_GPIO This driver can also be built as a module. If so, the module will be called i2c-mux-gpio. +config I2C_MUX_GPMUX + tristate "General Purpose I2C multiplexer" + select MULTIPLEXER + depends on OF || COMPILE_TEST + help + If you say yes to this option, support will be included for a + general purpose I2C multiplexer. This driver provides access to + I2C busses connected through a MUX, which in turn is controlled + by a MUX-controller from the MUX subsystem. + + This driver can also be built as a module. If so, the module + will be called i2c-mux-gpmux. + config I2C_MUX_LTC4306 tristate "LTC LTC4306/5 I2C multiplexer" select GPIOLIB diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile index ff7618cd5312..4a67d3199877 100644 --- a/drivers/i2c/muxes/Makefile +++ b/drivers/i2c/muxes/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o obj-$(CONFIG_I2C_DEMUX_PINCTRL) += i2c-demux-pinctrl.o obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o +obj-$(CONFIG_I2C_MUX_GPMUX) += i2c-mux-gpmux.o obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o diff --git a/drivers/i2c/muxes/i2c-mux-gpmux.c b/drivers/i2c/muxes/i2c-mux-gpmux.c new file mode 100644 index 000000000000..92cf5f48afe6 --- /dev/null +++ b/drivers/i2c/muxes/i2c-mux-gpmux.c @@ -0,0 +1,173 @@ +/* + * General Purpose I2C multiplexer + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include + +struct mux { + struct mux_control *control; + + bool do_not_deselect; +}; + +static int i2c_mux_select(struct i2c_mux_core *muxc, u32 chan) +{ + struct mux *mux = i2c_mux_priv(muxc); + int ret; + + ret = mux_control_select(mux->control, chan); + mux->do_not_deselect = ret < 0; + + return ret; +} + +static int i2c_mux_deselect(struct i2c_mux_core *muxc, u32 chan) +{ + struct mux *mux = i2c_mux_priv(muxc); + + if (mux->do_not_deselect) + return 0; + + return mux_control_deselect(mux->control); +} + +static struct i2c_adapter *mux_parent_adapter(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct device_node *parent_np; + struct i2c_adapter *parent; + + parent_np = of_parse_phandle(np, "i2c-parent", 0); + if (!parent_np) { + dev_err(dev, "Cannot parse i2c-parent\n"); + return ERR_PTR(-ENODEV); + } + parent = of_find_i2c_adapter_by_node(parent_np); + of_node_put(parent_np); + if (!parent) + return ERR_PTR(-EPROBE_DEFER); + + return parent; +} + +static const struct of_device_id i2c_mux_of_match[] = { + { .compatible = "i2c-mux", }, + {}, +}; +MODULE_DEVICE_TABLE(of, i2c_mux_of_match); + +static int i2c_mux_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *child; + struct i2c_mux_core *muxc; + struct mux *mux; + struct i2c_adapter *parent; + int children; + int ret; + + if (!np) + return -ENODEV; + + mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL); + if (!mux) + return -ENOMEM; + + mux->control = devm_mux_control_get(dev, NULL); + if (IS_ERR(mux->control)) { + if (PTR_ERR(mux->control) != -EPROBE_DEFER) + dev_err(dev, "failed to get control-mux\n"); + return PTR_ERR(mux->control); + } + + parent = mux_parent_adapter(dev); + if (IS_ERR(parent)) { + if (PTR_ERR(parent) != -EPROBE_DEFER) + dev_err(dev, "failed to get i2c-parent adapter\n"); + return PTR_ERR(parent); + } + + children = of_get_child_count(np); + + muxc = i2c_mux_alloc(parent, dev, children, 0, 0, + i2c_mux_select, i2c_mux_deselect); + if (!muxc) { + ret = -ENOMEM; + goto err_parent; + } + muxc->priv = mux; + + platform_set_drvdata(pdev, muxc); + + muxc->mux_locked = of_property_read_bool(np, "mux-locked"); + + for_each_child_of_node(np, child) { + u32 chan; + + ret = of_property_read_u32(child, "reg", &chan); + if (ret < 0) { + dev_err(dev, "no reg property for node '%s'\n", + child->name); + goto err_children; + } + + if (chan >= mux_control_states(mux->control)) { + dev_err(dev, "invalid reg %u\n", chan); + ret = -EINVAL; + goto err_children; + } + + ret = i2c_mux_add_adapter(muxc, 0, chan, 0); + if (ret) + goto err_children; + } + + dev_info(dev, "%d-port mux on %s adapter\n", children, parent->name); + + return 0; + +err_children: + i2c_mux_del_adapters(muxc); +err_parent: + i2c_put_adapter(parent); + + return ret; +} + +static int i2c_mux_remove(struct platform_device *pdev) +{ + struct i2c_mux_core *muxc = platform_get_drvdata(pdev); + + i2c_mux_del_adapters(muxc); + i2c_put_adapter(muxc->parent); + + return 0; +} + +static struct platform_driver i2c_mux_driver = { + .probe = i2c_mux_probe, + .remove = i2c_mux_remove, + .driver = { + .name = "i2c-mux-gpmux", + .of_match_table = i2c_mux_of_match, + }, +}; +module_platform_driver(i2c_mux_driver); + +MODULE_DESCRIPTION("General Purpose I2C multiplexer driver"); +MODULE_AUTHOR("Peter Rosin "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From f6689802eb7466c4a51b1ee8af021668a1b4fb13 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:13 +0200 Subject: dt-bindings: mux-adg792a: document devicetree bindings for ADG792A/G mux Analog Devices ADG792A/G is a triple 4:1 mux. Acked-by: Jonathan Cameron Reviewed-by: Rob Herring Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- .../devicetree/bindings/mux/adi,adg792a.txt | 75 ++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/devicetree/bindings/mux/adi,adg792a.txt diff --git a/Documentation/devicetree/bindings/mux/adi,adg792a.txt b/Documentation/devicetree/bindings/mux/adi,adg792a.txt new file mode 100644 index 000000000000..96b787a69f50 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/adi,adg792a.txt @@ -0,0 +1,75 @@ +Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers + +Required properties: +- compatible : "adi,adg792a" or "adi,adg792g" +- #mux-control-cells : <0> if parallel (the three muxes are bound together + with a single mux controller controlling all three muxes), or <1> if + not (one mux controller for each mux). +* Standard mux-controller bindings as described in mux-controller.txt + +Optional properties for ADG792G: +- gpio-controller : if present, #gpio-cells below is required. +- #gpio-cells : should be <2> + - First cell is the GPO line number, i.e. 0 or 1 + - Second cell is used to specify active high (0) + or active low (1) + +Optional properties: +- idle-state : if present, array of states that the mux controllers will have + when idle. The special state MUX_IDLE_AS_IS is the default and + MUX_IDLE_DISCONNECT is also supported. + +States 0 through 3 correspond to signals A through D in the datasheet. + +Example: + + /* + * Three independent mux controllers (of which one is used). + * Mux 0 is disconnected when idle, mux 1 idles in the previously + * selected state and mux 2 idles with signal B. + */ + &i2c0 { + mux: mux-controller@50 { + compatible = "adi,adg792a"; + reg = <0x50>; + #mux-control-cells = <1>; + + idle-state = ; + }; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux 2>; + + channels = "sync-1", "", "out"; + }; + + + /* + * Three parallel muxes with one mux controller, useful e.g. if + * the adc is differential, thus needing two signals to be muxed + * simultaneously for correct operation. + */ + &i2c0 { + pmux: mux-controller@50 { + compatible = "adi,adg792a"; + reg = <0x50>; + #mux-control-cells = <0>; + + idle-state = <1>; + }; + }; + + diff-adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&pmux>; + + channels = "sync-1", "", "out"; + }; -- cgit v1.2.3 From afda08c4caa9489511557def51e322a5f2142a2f Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Sun, 14 May 2017 21:51:14 +0200 Subject: mux: adg792a: add mux controller driver for ADG792A/G Analog Devices ADG792A/G is a triple 4:1 mux. Reviewed-by: Jonathan Cameron Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- drivers/mux/Kconfig | 12 ++++ drivers/mux/Makefile | 1 + drivers/mux/mux-adg792a.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 170 insertions(+) create mode 100644 drivers/mux/mux-adg792a.c diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig index 738670aaecb7..c4d050645605 100644 --- a/drivers/mux/Kconfig +++ b/drivers/mux/Kconfig @@ -17,6 +17,18 @@ menuconfig MULTIPLEXER if MULTIPLEXER +config MUX_ADG792A + tristate "Analog Devices ADG792A/ADG792G Multiplexers" + depends on I2C || COMPILE_TEST + help + ADG792A and ADG792G Wide Bandwidth Triple 4:1 Multiplexers + + The driver supports both operating the three multiplexers in + parallel and operating them independently. + + To compile the driver as a module, choose M here: the module will + be called mux-adg792a. + config MUX_GPIO tristate "GPIO-controlled Multiplexer" depends on GPIOLIB || COMPILE_TEST diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile index bb16953f6290..b00a7d37d2fb 100644 --- a/drivers/mux/Makefile +++ b/drivers/mux/Makefile @@ -3,4 +3,5 @@ # obj-$(CONFIG_MULTIPLEXER) += mux-core.o +obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o obj-$(CONFIG_MUX_GPIO) += mux-gpio.o diff --git a/drivers/mux/mux-adg792a.c b/drivers/mux/mux-adg792a.c new file mode 100644 index 000000000000..12aa221ab90d --- /dev/null +++ b/drivers/mux/mux-adg792a.c @@ -0,0 +1,157 @@ +/* + * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux + * + * Copyright (C) 2017 Axentia Technologies AB + * + * Author: Peter Rosin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include + +#define ADG792A_LDSW BIT(0) +#define ADG792A_RESETB BIT(1) +#define ADG792A_DISABLE(mux) (0x50 | (mux)) +#define ADG792A_DISABLE_ALL (0x5f) +#define ADG792A_MUX(mux, state) (0xc0 | (((mux) + 1) << 2) | (state)) +#define ADG792A_MUX_ALL(state) (0xc0 | (state)) + +static int adg792a_write_cmd(struct i2c_client *i2c, u8 cmd, int reset) +{ + u8 data = ADG792A_RESETB | ADG792A_LDSW; + + /* ADG792A_RESETB is active low, the chip resets when it is zero. */ + if (reset) + data &= ~ADG792A_RESETB; + + return i2c_smbus_write_byte_data(i2c, cmd, data); +} + +static int adg792a_set(struct mux_control *mux, int state) +{ + struct i2c_client *i2c = to_i2c_client(mux->chip->dev.parent); + u8 cmd; + + if (mux->chip->controllers == 1) { + /* parallel mux controller operation */ + if (state == MUX_IDLE_DISCONNECT) + cmd = ADG792A_DISABLE_ALL; + else + cmd = ADG792A_MUX_ALL(state); + } else { + unsigned int controller = mux_control_get_index(mux); + + if (state == MUX_IDLE_DISCONNECT) + cmd = ADG792A_DISABLE(controller); + else + cmd = ADG792A_MUX(controller, state); + } + + return adg792a_write_cmd(i2c, cmd, 0); +} + +static const struct mux_control_ops adg792a_ops = { + .set = adg792a_set, +}; + +static int adg792a_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct device *dev = &i2c->dev; + struct mux_chip *mux_chip; + s32 idle_state[3]; + u32 cells; + int ret; + int i; + + if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + ret = device_property_read_u32(dev, "#mux-control-cells", &cells); + if (ret < 0) + return ret; + if (cells >= 2) + return -EINVAL; + + mux_chip = devm_mux_chip_alloc(dev, cells ? 3 : 1, 0); + if (IS_ERR(mux_chip)) + return PTR_ERR(mux_chip); + + mux_chip->ops = &adg792a_ops; + + ret = adg792a_write_cmd(i2c, ADG792A_DISABLE_ALL, 1); + if (ret < 0) + return ret; + + ret = device_property_read_u32_array(dev, "idle-state", + (u32 *)idle_state, + mux_chip->controllers); + if (ret < 0) { + idle_state[0] = MUX_IDLE_AS_IS; + idle_state[1] = MUX_IDLE_AS_IS; + idle_state[2] = MUX_IDLE_AS_IS; + } + + for (i = 0; i < mux_chip->controllers; ++i) { + struct mux_control *mux = &mux_chip->mux[i]; + + mux->states = 4; + + switch (idle_state[i]) { + case MUX_IDLE_DISCONNECT: + case MUX_IDLE_AS_IS: + case 0 ... 4: + mux->idle_state = idle_state[i]; + break; + default: + dev_err(dev, "invalid idle-state %d\n", idle_state[i]); + return -EINVAL; + } + } + + ret = devm_mux_chip_register(dev, mux_chip); + if (ret < 0) + return ret; + + if (cells) + dev_info(dev, "3x single pole quadruple throw muxes registered\n"); + else + dev_info(dev, "triple pole quadruple throw mux registered\n"); + + return 0; +} + +static const struct i2c_device_id adg792a_id[] = { + { .name = "adg792a", }, + { .name = "adg792g", }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adg792a_id); + +static const struct of_device_id adg792a_of_match[] = { + { .compatible = "adi,adg792a", }, + { .compatible = "adi,adg792g", }, + { } +}; +MODULE_DEVICE_TABLE(of, adg792a_of_match); + +static struct i2c_driver adg792a_driver = { + .driver = { + .name = "adg792a", + .of_match_table = of_match_ptr(adg792a_of_match), + }, + .probe = adg792a_probe, + .id_table = adg792a_id, +}; +module_i2c_driver(adg792a_driver); + +MODULE_DESCRIPTION("Analog Devices ADG792A/G Triple 4:1 mux driver"); +MODULE_AUTHOR("Peter Rosin "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From 5dc75a2d93d52617d50d72f8c056eb3b8f80ba62 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Sun, 14 May 2017 21:51:15 +0200 Subject: dt-bindings: add mmio-based syscon mux controller DT bindings This adds device tree binding documentation for mmio-based syscon multiplexers controlled by a bitfields in a syscon register range. Signed-off-by: Philipp Zabel Acked-by: Rob Herring Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- Documentation/devicetree/bindings/mux/mmio-mux.txt | 60 ++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/mux/mmio-mux.txt diff --git a/Documentation/devicetree/bindings/mux/mmio-mux.txt b/Documentation/devicetree/bindings/mux/mmio-mux.txt new file mode 100644 index 000000000000..a9bfb4d8b6ac --- /dev/null +++ b/Documentation/devicetree/bindings/mux/mmio-mux.txt @@ -0,0 +1,60 @@ +MMIO register bitfield-based multiplexer controller bindings + +Define register bitfields to be used to control multiplexers. The parent +device tree node must be a syscon node to provide register access. + +Required properties: +- compatible : "mmio-mux" +- #mux-control-cells : <1> +- mux-reg-masks : an array of register offset and pre-shifted bitfield mask + pairs, each describing a single mux control. +* Standard mux-controller bindings as decribed in mux-controller.txt + +Optional properties: +- idle-states : if present, the state the muxes will have when idle. The + special state MUX_IDLE_AS_IS is the default. + +The multiplexer state of each multiplexer is defined as the value of the +bitfield described by the corresponding register offset and bitfield mask pair +in the mux-reg-masks array, accessed through the parent syscon. + +Example: + + syscon { + compatible = "syscon"; + + mux: mux-controller { + compatible = "mmio-mux"; + #mux-control-cells = <1>; + + mux-reg-masks = <0x3 0x30>, /* 0: reg 0x3, bits 5:4 */ + <0x3 0x40>, /* 1: reg 0x3, bit 6 */ + idle-states = , <0>; + }; + }; + + video-mux { + compatible = "video-mux"; + mux-controls = <&mux 0>; + + ports { + /* inputs 0..3 */ + port@0 { + reg = <0>; + }; + port@1 { + reg = <1>; + }; + port@2 { + reg = <2>; + }; + port@3 { + reg = <3>; + }; + + /* output */ + port@4 { + reg = <4>; + }; + }; + }; -- cgit v1.2.3 From 73726380a26fa1ed490f30fccee10ed9da28dc0c Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Sun, 14 May 2017 21:51:16 +0200 Subject: mux: mmio-based syscon mux controller This adds a driver for mmio-based syscon multiplexers controlled by bitfields in a syscon register range. Signed-off-by: Philipp Zabel Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- drivers/mux/Kconfig | 13 +++++ drivers/mux/Makefile | 1 + drivers/mux/mux-mmio.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 drivers/mux/mux-mmio.c diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig index c4d050645605..e8f1df74644c 100644 --- a/drivers/mux/Kconfig +++ b/drivers/mux/Kconfig @@ -43,4 +43,17 @@ config MUX_GPIO To compile the driver as a module, choose M here: the module will be called mux-gpio. +config MUX_MMIO + tristate "MMIO register bitfield-controlled Multiplexer" + depends on (OF && MFD_SYSCON) || COMPILE_TEST + help + MMIO register bitfield-controlled Multiplexer controller. + + The driver builds multiplexer controllers for bitfields in a syscon + register. For N bit wide bitfields, there will be 2^N possible + multiplexer states. + + To compile the driver as a module, choose M here: the module will + be called mux-mmio. + endif diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile index b00a7d37d2fb..6bac5b0fea13 100644 --- a/drivers/mux/Makefile +++ b/drivers/mux/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_MULTIPLEXER) += mux-core.o obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o obj-$(CONFIG_MUX_GPIO) += mux-gpio.o +obj-$(CONFIG_MUX_MMIO) += mux-mmio.o diff --git a/drivers/mux/mux-mmio.c b/drivers/mux/mux-mmio.c new file mode 100644 index 000000000000..37c1de359a70 --- /dev/null +++ b/drivers/mux/mux-mmio.c @@ -0,0 +1,141 @@ +/* + * MMIO register bitfield-controlled multiplexer driver + * + * Copyright (C) 2017 Pengutronix, Philipp Zabel + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int mux_mmio_set(struct mux_control *mux, int state) +{ + struct regmap_field **fields = mux_chip_priv(mux->chip); + + return regmap_field_write(fields[mux_control_get_index(mux)], state); +} + +static const struct mux_control_ops mux_mmio_ops = { + .set = mux_mmio_set, +}; + +static const struct of_device_id mux_mmio_dt_ids[] = { + { .compatible = "mmio-mux", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids); + +static int mux_mmio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct regmap_field **fields; + struct mux_chip *mux_chip; + struct regmap *regmap; + int num_fields; + int ret; + int i; + + regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(regmap)) { + ret = PTR_ERR(regmap); + dev_err(dev, "failed to get regmap: %d\n", ret); + return ret; + } + + ret = of_property_count_u32_elems(np, "mux-reg-masks"); + if (ret == 0 || ret % 2) + ret = -EINVAL; + if (ret < 0) { + dev_err(dev, "mux-reg-masks property missing or invalid: %d\n", + ret); + return ret; + } + num_fields = ret / 2; + + mux_chip = devm_mux_chip_alloc(dev, num_fields, num_fields * + sizeof(*fields)); + if (IS_ERR(mux_chip)) + return PTR_ERR(mux_chip); + + fields = mux_chip_priv(mux_chip); + + for (i = 0; i < num_fields; i++) { + struct mux_control *mux = &mux_chip->mux[i]; + struct reg_field field; + s32 idle_state = MUX_IDLE_AS_IS; + u32 reg, mask; + int bits; + + ret = of_property_read_u32_index(np, "mux-reg-masks", + 2 * i, ®); + if (!ret) + ret = of_property_read_u32_index(np, "mux-reg-masks", + 2 * i + 1, &mask); + if (ret < 0) { + dev_err(dev, "bitfield %d: failed to read mux-reg-masks property: %d\n", + i, ret); + return ret; + } + + field.reg = reg; + field.msb = fls(mask) - 1; + field.lsb = ffs(mask) - 1; + + if (mask != GENMASK(field.msb, field.lsb)) { + dev_err(dev, "bitfield %d: invalid mask 0x%x\n", + i, mask); + return -EINVAL; + } + + fields[i] = devm_regmap_field_alloc(dev, regmap, field); + if (IS_ERR(fields[i])) { + ret = PTR_ERR(fields[i]); + dev_err(dev, "bitfield %d: failed allocate: %d\n", + i, ret); + return ret; + } + + bits = 1 + field.msb - field.lsb; + mux->states = 1 << bits; + + of_property_read_u32_index(np, "idle-states", i, + (u32 *)&idle_state); + if (idle_state != MUX_IDLE_AS_IS) { + if (idle_state < 0 || idle_state >= mux->states) { + dev_err(dev, "bitfield: %d: out of range idle state %d\n", + i, idle_state); + return -EINVAL; + } + + mux->idle_state = idle_state; + } + } + + mux_chip->ops = &mux_mmio_ops; + + return devm_mux_chip_register(dev, mux_chip); +} + +static struct platform_driver mux_mmio_driver = { + .driver = { + .name = "mmio-mux", + .of_match_table = of_match_ptr(mux_mmio_dt_ids), + }, + .probe = mux_mmio_probe, +}; +module_platform_driver(mux_mmio_driver); + +MODULE_DESCRIPTION("MMIO register bitfield-controlled multiplexer driver"); +MODULE_AUTHOR("Philipp Zabel "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From 16a1258af5d8e1bd58e20fc70069f9dd91cc5b34 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:53 +0300 Subject: thunderbolt: Use const buffer pointer in write operations These functions should not (and do not) modify the argument in any way so make it const. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Reviewed-by: Greg Kroah-Hartman Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 8 ++++---- drivers/thunderbolt/ctl.h | 4 ++-- drivers/thunderbolt/tb.h | 2 +- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 1146ff4210a9..1031d97407a8 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -273,7 +273,7 @@ static void tb_cfg_print_error(struct tb_ctl *ctl, } } -static void cpu_to_be32_array(__be32 *dst, u32 *src, size_t len) +static void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len) { int i; for (i = 0; i < len; i++) @@ -333,7 +333,7 @@ static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame, * * Return: Returns 0 on success or an error code on failure. */ -static int tb_ctl_tx(struct tb_ctl *ctl, void *data, size_t len, +static int tb_ctl_tx(struct tb_ctl *ctl, const void *data, size_t len, enum tb_cfg_pkg_type type) { int res; @@ -650,7 +650,7 @@ struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, * * Offset and length are in dwords. */ -struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, void *buffer, +struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length, int timeout_msec) { @@ -695,7 +695,7 @@ int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, return res.err; } -int tb_cfg_write(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, +int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length) { struct tb_cfg_result res = tb_cfg_write_raw(ctl, buffer, route, port, diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h index ba87d6e731dd..83ae54947082 100644 --- a/drivers/thunderbolt/ctl.h +++ b/drivers/thunderbolt/ctl.h @@ -61,13 +61,13 @@ struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length, int timeout_msec); -struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, void *buffer, +struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length, int timeout_msec); int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length); -int tb_cfg_write(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, +int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length); int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route); diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 61d57ba64035..ba2b85750335 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -173,7 +173,7 @@ static inline int tb_port_read(struct tb_port *port, void *buffer, length); } -static inline int tb_port_write(struct tb_port *port, void *buffer, +static inline int tb_port_write(struct tb_port *port, const void *buffer, enum tb_cfg_space space, u32 offset, u32 length) { return tb_cfg_write(port->sw->tb->ctl, -- cgit v1.2.3 From 08a5e4cebec543bfa4a6d119fc18f0ed8fd9d8ce Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:54 +0300 Subject: thunderbolt: No need to read UID of the root switch on resume The root switch is part of the host controller and cannot be physically removed, so there is no point of reading UID again on resume in order to check if the root switch is still the same. Suggested-by: Andreas Noever Signed-off-by: Mika Westerberg Signed-off-by: Andreas Noever Reviewed-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index c6f30b1695a9..81f5164a6364 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -452,19 +452,26 @@ void tb_sw_set_unplugged(struct tb_switch *sw) int tb_switch_resume(struct tb_switch *sw) { int i, err; - u64 uid; tb_sw_info(sw, "resuming switch\n"); - err = tb_drom_read_uid_only(sw, &uid); - if (err) { - tb_sw_warn(sw, "uid read failed\n"); - return err; - } - if (sw != sw->tb->root_switch && sw->uid != uid) { - tb_sw_info(sw, - "changed while suspended (uid %#llx -> %#llx)\n", - sw->uid, uid); - return -ENODEV; + /* + * Check for UID of the connected switches except for root + * switch which we assume cannot be removed. + */ + if (tb_route(sw)) { + u64 uid; + + err = tb_drom_read_uid_only(sw, &uid); + if (err) { + tb_sw_warn(sw, "uid read failed\n"); + return err; + } + if (sw->uid != uid) { + tb_sw_info(sw, + "changed while suspended (uid %#llx -> %#llx)\n", + sw->uid, uid); + return -ENODEV; + } } /* upload configuration */ -- cgit v1.2.3 From df1421b5f72979e48096f68c253f59aa7e8e7468 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:55 +0300 Subject: thunderbolt: Do not try to read UID if DROM offset is read as 0 At least Falcon Ridge when in host mode does not have any kind of DROM available and reading DROM offset returns 0 for these. Do not try to read DROM any further in that case. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/eeprom.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index 6392990c984d..e4e64b130514 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -276,6 +276,9 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid) if (res) return res; + if (drom_offset == 0) + return -ENODEV; + /* read uid */ res = tb_eeprom_read_n(sw, drom_offset, data, 9); if (res) -- cgit v1.2.3 From b2466355c0007cbd853c3babce0cdb6ef1ff23bc Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:56 +0300 Subject: thunderbolt: Do not warn about newer DROM versions DROM version 2 is compatible with the previous generation so no need to warn about that. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/eeprom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index e4e64b130514..eb2179c98b09 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -488,7 +488,7 @@ parse: goto err; } - if (header->device_rom_revision > 1) + if (header->device_rom_revision > 2) tb_sw_warn(sw, "drom device_rom_revision %#x unknown\n", header->device_rom_revision); -- cgit v1.2.3 From 046bee1f9ab83b4549c185804ae9cbfbb8f9641f Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:57 +0300 Subject: thunderbolt: Add MSI-X support Intel Thunderbolt controllers support up to 16 MSI-X vectors. Using MSI-X is preferred over MSI or legacy interrupt and may bring additional performance because there is no need to check the status registers which interrupt was triggered. While there we convert comments in structs tb_ring and tb_nhi to follow kernel-doc format more closely. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 4 +- drivers/thunderbolt/nhi.c | 165 +++++++++++++++++++++++++++++++++++------ drivers/thunderbolt/nhi.h | 56 +++++++++++--- drivers/thunderbolt/nhi_regs.h | 9 +++ 4 files changed, 198 insertions(+), 36 deletions(-) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 1031d97407a8..889a32dd21e7 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -488,11 +488,11 @@ struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data) if (!ctl->frame_pool) goto err; - ctl->tx = ring_alloc_tx(nhi, 0, 10); + ctl->tx = ring_alloc_tx(nhi, 0, 10, RING_FLAG_NO_SUSPEND); if (!ctl->tx) goto err; - ctl->rx = ring_alloc_rx(nhi, 0, 10); + ctl->rx = ring_alloc_rx(nhi, 0, 10, RING_FLAG_NO_SUSPEND); if (!ctl->rx) goto err; diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index a8c20413dbda..ed75c49748f5 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -21,6 +21,12 @@ #define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring") +/* + * Minimal number of vectors when we use MSI-X. Two for control channel + * Rx/Tx and the rest four are for cross domain DMA paths. + */ +#define MSIX_MIN_VECS 6 +#define MSIX_MAX_VECS 16 static int ring_interrupt_index(struct tb_ring *ring) { @@ -42,6 +48,37 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active) int bit = ring_interrupt_index(ring) & 31; int mask = 1 << bit; u32 old, new; + + if (ring->irq > 0) { + u32 step, shift, ivr, misc; + void __iomem *ivr_base; + int index; + + if (ring->is_tx) + index = ring->hop; + else + index = ring->hop + ring->nhi->hop_count; + + /* + * Ask the hardware to clear interrupt status bits automatically + * since we already know which interrupt was triggered. + */ + misc = ioread32(ring->nhi->iobase + REG_DMA_MISC); + if (!(misc & REG_DMA_MISC_INT_AUTO_CLEAR)) { + misc |= REG_DMA_MISC_INT_AUTO_CLEAR; + iowrite32(misc, ring->nhi->iobase + REG_DMA_MISC); + } + + ivr_base = ring->nhi->iobase + REG_INT_VEC_ALLOC_BASE; + step = index / REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS; + shift = index % REG_INT_VEC_ALLOC_REGS * REG_INT_VEC_ALLOC_BITS; + ivr = ioread32(ivr_base + step); + ivr &= ~(REG_INT_VEC_ALLOC_MASK << shift); + if (active) + ivr |= ring->vector << shift; + iowrite32(ivr, ivr_base + step); + } + old = ioread32(ring->nhi->iobase + reg); if (active) new = old | mask; @@ -239,8 +276,50 @@ int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame) return ret; } +static irqreturn_t ring_msix(int irq, void *data) +{ + struct tb_ring *ring = data; + + schedule_work(&ring->work); + return IRQ_HANDLED; +} + +static int ring_request_msix(struct tb_ring *ring, bool no_suspend) +{ + struct tb_nhi *nhi = ring->nhi; + unsigned long irqflags; + int ret; + + if (!nhi->pdev->msix_enabled) + return 0; + + ret = ida_simple_get(&nhi->msix_ida, 0, MSIX_MAX_VECS, GFP_KERNEL); + if (ret < 0) + return ret; + + ring->vector = ret; + + ring->irq = pci_irq_vector(ring->nhi->pdev, ring->vector); + if (ring->irq < 0) + return ring->irq; + + irqflags = no_suspend ? IRQF_NO_SUSPEND : 0; + return request_irq(ring->irq, ring_msix, irqflags, "thunderbolt", ring); +} + +static void ring_release_msix(struct tb_ring *ring) +{ + if (ring->irq <= 0) + return; + + free_irq(ring->irq, ring); + ida_simple_remove(&ring->nhi->msix_ida, ring->vector); + ring->vector = 0; + ring->irq = 0; +} + static struct tb_ring *ring_alloc(struct tb_nhi *nhi, u32 hop, int size, - bool transmit) + bool transmit, unsigned int flags) { struct tb_ring *ring = NULL; dev_info(&nhi->pdev->dev, "allocating %s ring %d of size %d\n", @@ -271,9 +350,14 @@ static struct tb_ring *ring_alloc(struct tb_nhi *nhi, u32 hop, int size, ring->hop = hop; ring->is_tx = transmit; ring->size = size; + ring->flags = flags; ring->head = 0; ring->tail = 0; ring->running = false; + + if (ring_request_msix(ring, flags & RING_FLAG_NO_SUSPEND)) + goto err; + ring->descriptors = dma_alloc_coherent(&ring->nhi->pdev->dev, size * sizeof(*ring->descriptors), &ring->descriptors_dma, GFP_KERNEL | __GFP_ZERO); @@ -295,14 +379,16 @@ err: return NULL; } -struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size) +struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size, + unsigned int flags) { - return ring_alloc(nhi, hop, size, true); + return ring_alloc(nhi, hop, size, true, flags); } -struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size) +struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size, + unsigned int flags) { - return ring_alloc(nhi, hop, size, false); + return ring_alloc(nhi, hop, size, false, flags); } /** @@ -413,6 +499,8 @@ void ring_free(struct tb_ring *ring) RING_TYPE(ring), ring->hop); } + ring_release_msix(ring); + dma_free_coherent(&ring->nhi->pdev->dev, ring->size * sizeof(*ring->descriptors), ring->descriptors, ring->descriptors_dma); @@ -428,9 +516,9 @@ void ring_free(struct tb_ring *ring) mutex_unlock(&ring->nhi->lock); /** - * ring->work can no longer be scheduled (it is scheduled only by - * nhi_interrupt_work and ring_stop). Wait for it to finish before - * freeing the ring. + * ring->work can no longer be scheduled (it is scheduled only + * by nhi_interrupt_work, ring_stop and ring_msix). Wait for it + * to finish before freeing the ring. */ flush_work(&ring->work); mutex_destroy(&ring->lock); @@ -528,9 +616,52 @@ static void nhi_shutdown(struct tb_nhi *nhi) * We have to release the irq before calling flush_work. Otherwise an * already executing IRQ handler could call schedule_work again. */ - devm_free_irq(&nhi->pdev->dev, nhi->pdev->irq, nhi); - flush_work(&nhi->interrupt_work); + if (!nhi->pdev->msix_enabled) { + devm_free_irq(&nhi->pdev->dev, nhi->pdev->irq, nhi); + flush_work(&nhi->interrupt_work); + } mutex_destroy(&nhi->lock); + ida_destroy(&nhi->msix_ida); +} + +static int nhi_init_msi(struct tb_nhi *nhi) +{ + struct pci_dev *pdev = nhi->pdev; + int res, irq, nvec; + + /* In case someone left them on. */ + nhi_disable_interrupts(nhi); + + ida_init(&nhi->msix_ida); + + /* + * The NHI has 16 MSI-X vectors or a single MSI. We first try to + * get all MSI-X vectors and if we succeed, each ring will have + * one MSI-X. If for some reason that does not work out, we + * fallback to a single MSI. + */ + nvec = pci_alloc_irq_vectors(pdev, MSIX_MIN_VECS, MSIX_MAX_VECS, + PCI_IRQ_MSIX); + if (nvec < 0) { + nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); + if (nvec < 0) + return nvec; + + INIT_WORK(&nhi->interrupt_work, nhi_interrupt_work); + + irq = pci_irq_vector(nhi->pdev, 0); + if (irq < 0) + return irq; + + res = devm_request_irq(&pdev->dev, irq, nhi_msi, + IRQF_NO_SUSPEND, "thunderbolt", nhi); + if (res) { + dev_err(&pdev->dev, "request_irq failed, aborting\n"); + return res; + } + } + + return 0; } static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) @@ -545,12 +676,6 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) return res; } - res = pci_enable_msi(pdev); - if (res) { - dev_err(&pdev->dev, "cannot enable MSI, aborting\n"); - return res; - } - res = pcim_iomap_regions(pdev, 1 << 0, "thunderbolt"); if (res) { dev_err(&pdev->dev, "cannot obtain PCI resources, aborting\n"); @@ -568,7 +693,6 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (nhi->hop_count != 12 && nhi->hop_count != 32) dev_warn(&pdev->dev, "unexpected hop count: %d\n", nhi->hop_count); - INIT_WORK(&nhi->interrupt_work, nhi_interrupt_work); nhi->tx_rings = devm_kcalloc(&pdev->dev, nhi->hop_count, sizeof(*nhi->tx_rings), GFP_KERNEL); @@ -577,12 +701,9 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (!nhi->tx_rings || !nhi->rx_rings) return -ENOMEM; - nhi_disable_interrupts(nhi); /* In case someone left them on. */ - res = devm_request_irq(&pdev->dev, pdev->irq, nhi_msi, - IRQF_NO_SUSPEND, /* must work during _noirq */ - "thunderbolt", nhi); + res = nhi_init_msi(nhi); if (res) { - dev_err(&pdev->dev, "request_irq failed, aborting\n"); + dev_err(&pdev->dev, "cannot enable MSI, aborting\n"); return res; } diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h index 317242939b31..630f44140530 100644 --- a/drivers/thunderbolt/nhi.h +++ b/drivers/thunderbolt/nhi.h @@ -7,45 +7,75 @@ #ifndef DSL3510_H_ #define DSL3510_H_ +#include #include #include /** * struct tb_nhi - thunderbolt native host interface + * @lock: Must be held during ring creation/destruction. Is acquired by + * interrupt_work when dispatching interrupts to individual rings. + * @pdev: Pointer to the PCI device + * @iobase: MMIO space of the NHI + * @tx_rings: All Tx rings available on this host controller + * @rx_rings: All Rx rings available on this host controller + * @msix_ida: Used to allocate MSI-X vectors for rings + * @interrupt_work: Work scheduled to handle ring interrupt when no + * MSI-X is used. + * @hop_count: Number of rings (end point hops) supported by NHI. */ struct tb_nhi { - struct mutex lock; /* - * Must be held during ring creation/destruction. - * Is acquired by interrupt_work when dispatching - * interrupts to individual rings. - **/ + struct mutex lock; struct pci_dev *pdev; void __iomem *iobase; struct tb_ring **tx_rings; struct tb_ring **rx_rings; + struct ida msix_ida; struct work_struct interrupt_work; - u32 hop_count; /* Number of rings (end point hops) supported by NHI. */ + u32 hop_count; }; /** * struct tb_ring - thunderbolt TX or RX ring associated with a NHI + * @lock: Lock serializing actions to this ring. Must be acquired after + * nhi->lock. + * @nhi: Pointer to the native host controller interface + * @size: Size of the ring + * @hop: Hop (DMA channel) associated with this ring + * @head: Head of the ring (write next descriptor here) + * @tail: Tail of the ring (complete next descriptor here) + * @descriptors: Allocated descriptors for this ring + * @queue: Queue holding frames to be transferred over this ring + * @in_flight: Queue holding frames that are currently in flight + * @work: Interrupt work structure + * @is_tx: Is the ring Tx or Rx + * @running: Is the ring running + * @irq: MSI-X irq number if the ring uses MSI-X. %0 otherwise. + * @vector: MSI-X vector number the ring uses (only set if @irq is > 0) + * @flags: Ring specific flags */ struct tb_ring { - struct mutex lock; /* must be acquired after nhi->lock */ + struct mutex lock; struct tb_nhi *nhi; int size; int hop; - int head; /* write next descriptor here */ - int tail; /* complete next descriptor here */ + int head; + int tail; struct ring_desc *descriptors; dma_addr_t descriptors_dma; struct list_head queue; struct list_head in_flight; struct work_struct work; - bool is_tx:1; /* rx otherwise */ + bool is_tx:1; bool running:1; + int irq; + u8 vector; + unsigned int flags; }; +/* Leave ring interrupt enabled on suspend */ +#define RING_FLAG_NO_SUSPEND BIT(0) + struct ring_frame; typedef void (*ring_cb)(struct tb_ring*, struct ring_frame*, bool canceled); @@ -64,8 +94,10 @@ struct ring_frame { #define TB_FRAME_SIZE 0x100 /* minimum size for ring_rx */ -struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size); -struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size); +struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size, + unsigned int flags); +struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size, + unsigned int flags); void ring_start(struct tb_ring *ring); void ring_stop(struct tb_ring *ring); void ring_free(struct tb_ring *ring); diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h index 75cf0691e6c5..48b98d3c7e6a 100644 --- a/drivers/thunderbolt/nhi_regs.h +++ b/drivers/thunderbolt/nhi_regs.h @@ -95,7 +95,16 @@ struct ring_desc { #define REG_RING_INTERRUPT_BASE 0x38200 #define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32) +/* Interrupt Vector Allocation */ +#define REG_INT_VEC_ALLOC_BASE 0x38c40 +#define REG_INT_VEC_ALLOC_BITS 4 +#define REG_INT_VEC_ALLOC_MASK GENMASK(3, 0) +#define REG_INT_VEC_ALLOC_REGS (32 / REG_INT_VEC_ALLOC_BITS) + /* The last 11 bits contain the number of hops supported by the NHI port. */ #define REG_HOP_COUNT 0x39640 +#define REG_DMA_MISC 0x39864 +#define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2) + #endif -- cgit v1.2.3 From da2da04b8d4476a411feb2a12b47792aebbc142f Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:58 +0300 Subject: thunderbolt: Rework capability handling Organization of the capabilities in switches and ports is not so random after all. Rework the capability handling functionality so that it follows how capabilities are organized and provide two new functions (tb_switch_find_vse_cap() and tb_port_find_cap()) which can be used to extract capabilities for ports and switches. Then convert the current users over these. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/cap.c | 169 +++++++++++++++++++++------------------ drivers/thunderbolt/switch.c | 6 +- drivers/thunderbolt/tb.c | 8 +- drivers/thunderbolt/tb.h | 3 +- drivers/thunderbolt/tb_regs.h | 50 +++++++++--- drivers/thunderbolt/tunnel_pci.c | 8 +- 6 files changed, 142 insertions(+), 102 deletions(-) diff --git a/drivers/thunderbolt/cap.c b/drivers/thunderbolt/cap.c index a7b47e7cddbd..38bc27a5ce4f 100644 --- a/drivers/thunderbolt/cap.c +++ b/drivers/thunderbolt/cap.c @@ -9,6 +9,8 @@ #include "tb.h" +#define CAP_OFFSET_MAX 0xff +#define VSE_CAP_OFFSET_MAX 0xffff struct tb_cap_any { union { @@ -18,99 +20,110 @@ struct tb_cap_any { }; } __packed; -static bool tb_cap_is_basic(struct tb_cap_any *cap) -{ - /* basic.cap is u8. This checks only the lower 8 bit of cap. */ - return cap->basic.cap != 5; -} - -static bool tb_cap_is_long(struct tb_cap_any *cap) +/** + * tb_port_find_cap() - Find port capability + * @port: Port to find the capability for + * @cap: Capability to look + * + * Returns offset to start of capability or %-ENOENT if no such + * capability was found. Negative errno is returned if there was an + * error. + */ +int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap) { - return !tb_cap_is_basic(cap) - && cap->extended_short.next == 0 - && cap->extended_short.length == 0; -} + u32 offset; -static enum tb_cap tb_cap(struct tb_cap_any *cap) -{ - if (tb_cap_is_basic(cap)) - return cap->basic.cap; + /* + * DP out adapters claim to implement TMU capability but in + * reality they do not so we hard code the adapter specific + * capability offset here. + */ + if (port->config.type == TB_TYPE_DP_HDMI_OUT) + offset = 0x39; else - /* extended_short/long have cap at the same offset. */ - return cap->extended_short.cap; + offset = 0x1; + + do { + struct tb_cap_any header; + int ret; + + ret = tb_port_read(port, &header, TB_CFG_PORT, offset, 1); + if (ret) + return ret; + + if (header.basic.cap == cap) + return offset; + + offset = header.basic.next; + } while (offset); + + return -ENOENT; } -static u32 tb_cap_next(struct tb_cap_any *cap, u32 offset) +static int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap) { - int next; - if (offset == 1) { - /* - * The first pointer is part of the switch header and always - * a simple pointer. - */ - next = cap->basic.next; - } else { - /* - * Somehow Intel decided to use 3 different types of capability - * headers. It is not like anyone could have predicted that - * single byte offsets are not enough... - */ - if (tb_cap_is_basic(cap)) - next = cap->basic.next; - else if (!tb_cap_is_long(cap)) - next = cap->extended_short.next; - else - next = cap->extended_long.next; + int offset = sw->config.first_cap_offset; + + while (offset > 0 && offset < CAP_OFFSET_MAX) { + struct tb_cap_any header; + int ret; + + ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 1); + if (ret) + return ret; + + if (header.basic.cap == cap) + return offset; + + offset = header.basic.next; } - /* - * "Hey, we could terminate some capability lists with a null offset - * and others with a pointer to the last element." - "Great idea!" - */ - if (next == offset) - return 0; - return next; + + return -ENOENT; } /** - * tb_find_cap() - find a capability + * tb_switch_find_vse_cap() - Find switch vendor specific capability + * @sw: Switch to find the capability for + * @vsec: Vendor specific capability to look * - * Return: Returns a positive offset if the capability was found and 0 if not. - * Returns an error code on failure. + * Functions enumerates vendor specific capabilities (VSEC) of a switch + * and returns offset when capability matching @vsec is found. If no + * such capability is found returns %-ENOENT. In case of error returns + * negative errno. */ -int tb_find_cap(struct tb_port *port, enum tb_cfg_space space, enum tb_cap cap) +int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec) { - u32 offset = 1; struct tb_cap_any header; - int res; - int retries = 10; - while (retries--) { - res = tb_port_read(port, &header, space, offset, 1); - if (res) { - /* Intel needs some help with linked lists. */ - if (space == TB_CFG_PORT && offset == 0xa - && port->config.type == TB_TYPE_DP_HDMI_OUT) { - offset = 0x39; - continue; - } - return res; - } - if (offset != 1) { - if (tb_cap(&header) == cap) + int offset; + + offset = tb_switch_find_cap(sw, TB_SWITCH_CAP_VSE); + if (offset < 0) + return offset; + + while (offset > 0 && offset < VSE_CAP_OFFSET_MAX) { + int ret; + + ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 2); + if (ret) + return ret; + + /* + * Extended vendor specific capabilities come in two + * flavors: short and long. The latter is used when + * offset is over 0xff. + */ + if (offset >= CAP_OFFSET_MAX) { + if (header.extended_long.vsec_id == vsec) return offset; - if (tb_cap_is_long(&header)) { - /* tb_cap_extended_long is 2 dwords */ - res = tb_port_read(port, &header, space, - offset, 2); - if (res) - return res; - } + offset = header.extended_long.next; + } else { + if (header.extended_short.vsec_id == vsec) + return offset; + if (!header.extended_short.length) + return -ENOENT; + offset = header.extended_short.next; } - offset = tb_cap_next(&header, offset); - if (!offset) - return 0; } - tb_port_WARN(port, - "run out of retries while looking for cap %#x in config space %d, last offset: %#x\n", - cap, space, offset); - return -EIO; + + return -ENOENT; } diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 81f5164a6364..b379b4183bac 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -192,7 +192,7 @@ static int tb_init_port(struct tb_port *port) /* Port 0 is the switch itself and has no PHY. */ if (port->config.type == TB_TYPE_PORT && port->port != 0) { - cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PHY); + cap = tb_port_find_cap(port, TB_PORT_CAP_PHY); if (cap > 0) port->cap_phy = cap; @@ -394,9 +394,9 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) sw->ports[i].port = i; } - cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS); + cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS); if (cap < 0) { - tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n"); + tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n"); goto err; } sw->cap_plug_events = cap; diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 24b6d30c3c86..6b44076e1380 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -121,8 +121,8 @@ static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw) continue; if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN) continue; - cap = tb_find_cap(&sw->ports[i], TB_CFG_PORT, TB_CAP_PCIE); - if (cap <= 0) + cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP); + if (cap < 0) continue; res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1); if (res < 0) @@ -165,8 +165,8 @@ static void tb_activate_pcie_devices(struct tb *tb) } /* check whether port is already activated */ - cap = tb_find_cap(up_port, TB_CFG_PORT, TB_CAP_PCIE); - if (cap <= 0) + cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP); + if (cap < 0) continue; if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1)) continue; diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index ba2b85750335..0b78bc4fbe61 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -233,7 +233,8 @@ int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged); int tb_port_add_nfc_credits(struct tb_port *port, int credits); int tb_port_clear_counter(struct tb_port *port, int counter); -int tb_find_cap(struct tb_port *port, enum tb_cfg_space space, enum tb_cap cap); +int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec); +int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap); struct tb_path *tb_path_alloc(struct tb *tb, int num_hops); void tb_path_free(struct tb_path *path); diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h index 1e2a4a8046be..582bd1f156dc 100644 --- a/drivers/thunderbolt/tb_regs.h +++ b/drivers/thunderbolt/tb_regs.h @@ -23,15 +23,22 @@ */ #define TB_MAX_CONFIG_RW_LENGTH 60 -enum tb_cap { - TB_CAP_PHY = 0x0001, - TB_CAP_TIME1 = 0x0003, - TB_CAP_PCIE = 0x0004, - TB_CAP_I2C = 0x0005, - TB_CAP_PLUG_EVENTS = 0x0105, /* also EEPROM */ - TB_CAP_TIME2 = 0x0305, - TB_CAP_IECS = 0x0405, - TB_CAP_LINK_CONTROLLER = 0x0605, /* also IECS */ +enum tb_switch_cap { + TB_SWITCH_CAP_VSE = 0x05, +}; + +enum tb_switch_vse_cap { + TB_VSE_CAP_PLUG_EVENTS = 0x01, /* also EEPROM */ + TB_VSE_CAP_TIME2 = 0x03, + TB_VSE_CAP_IECS = 0x04, + TB_VSE_CAP_LINK_CONTROLLER = 0x06, /* also IECS */ +}; + +enum tb_port_cap { + TB_PORT_CAP_PHY = 0x01, + TB_PORT_CAP_TIME1 = 0x03, + TB_PORT_CAP_ADAP = 0x04, + TB_PORT_CAP_VSE = 0x05, }; enum tb_port_state { @@ -49,15 +56,34 @@ struct tb_cap_basic { u8 cap; /* if cap == 0x05 then we have a extended capability */ } __packed; +/** + * struct tb_cap_extended_short - Switch extended short capability + * @next: Pointer to the next capability. If @next and @length are zero + * then we have a long cap. + * @cap: Base capability ID (see &enum tb_switch_cap) + * @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap) + * @length: Length of this capability + */ struct tb_cap_extended_short { - u8 next; /* if next and length are zero then we have a long cap */ - enum tb_cap cap:16; + u8 next; + u8 cap; + u8 vsec_id; u8 length; } __packed; +/** + * struct tb_cap_extended_long - Switch extended long capability + * @zero1: This field should be zero + * @cap: Base capability ID (see &enum tb_switch_cap) + * @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap) + * @zero2: This field should be zero + * @next: Pointer to the next capability + * @length: Length of this capability + */ struct tb_cap_extended_long { u8 zero1; - enum tb_cap cap:16; + u8 cap; + u8 vsec_id; u8 zero2; u16 next; u16 length; diff --git a/drivers/thunderbolt/tunnel_pci.c b/drivers/thunderbolt/tunnel_pci.c index baf1cd370446..f4ce9845e42a 100644 --- a/drivers/thunderbolt/tunnel_pci.c +++ b/drivers/thunderbolt/tunnel_pci.c @@ -147,10 +147,10 @@ bool tb_pci_is_invalid(struct tb_pci_tunnel *tunnel) static int tb_pci_port_active(struct tb_port *port, bool active) { u32 word = active ? 0x80000000 : 0x0; - int cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PCIE); - if (cap <= 0) { - tb_port_warn(port, "TB_CAP_PCIE not found: %d\n", cap); - return cap ? cap : -ENXIO; + int cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP); + if (cap < 0) { + tb_port_warn(port, "TB_PORT_CAP_ADAP not found: %d\n", cap); + return cap; } return tb_port_write(port, &word, TB_CFG_PORT, cap, 1); } -- cgit v1.2.3 From c9843ebbb83a120094aa3a55bc0190d285e8384a Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:24:59 +0300 Subject: thunderbolt: Allow passing NULL to tb_ctl_free() Following the usual pattern used in many places, we allow passing NULL pointer to tb_ctl_free(). Then the user can call the function regardless if it has allocated control channel or not making the code bit simpler. Suggested-by: Andy Shevchenko Signed-off-by: Mika Westerberg Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 889a32dd21e7..f8290a577b2b 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -520,6 +520,10 @@ err: void tb_ctl_free(struct tb_ctl *ctl) { int i; + + if (!ctl) + return; + if (ctl->rx) ring_free(ctl->rx); if (ctl->tx) -- cgit v1.2.3 From 9d3cce0b613689ee849a505ffac179af0ae9fff2 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:00 +0300 Subject: thunderbolt: Introduce thunderbolt bus and connection manager Thunderbolt fabric consists of one or more switches. This fabric is called domain and it is controlled by an entity called connection manager. The connection manager can be either internal (driven by a firmware running on the host controller) or external (software driver). This driver currently implements support for the latter. In order to manage switches and their properties more easily we model this domain structure as a Linux bus. Each host controller adds a domain device to this bus, and these devices are named as domainN where N stands for index or id of the current domain. We then abstract connection manager specific operations into a new structure tb_cm_ops and convert the existing tb.c to fill those accordingly. This makes it easier to add support for the internal connection manager in subsequent patches. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/Makefile | 2 +- drivers/thunderbolt/domain.c | 230 +++++++++++++++++++++++++++++++++++++++ drivers/thunderbolt/nhi.c | 31 ++++-- drivers/thunderbolt/tb.c | 156 ++++++++++++-------------- drivers/thunderbolt/tb.h | 70 +++++++++--- drivers/thunderbolt/tunnel_pci.c | 9 +- 6 files changed, 377 insertions(+), 121 deletions(-) create mode 100644 drivers/thunderbolt/domain.c diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile index 5d1053cdfa54..e276a9a62261 100644 --- a/drivers/thunderbolt/Makefile +++ b/drivers/thunderbolt/Makefile @@ -1,3 +1,3 @@ obj-${CONFIG_THUNDERBOLT} := thunderbolt.o thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel_pci.o eeprom.o - +thunderbolt-objs += domain.o diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c new file mode 100644 index 000000000000..3302f4c59638 --- /dev/null +++ b/drivers/thunderbolt/domain.c @@ -0,0 +1,230 @@ +/* + * Thunderbolt bus support + * + * Copyright (C) 2017, Intel Corporation + * Author: Mika Westerberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +#include "tb.h" + +static DEFINE_IDA(tb_domain_ida); + +struct bus_type tb_bus_type = { + .name = "thunderbolt", +}; + +static void tb_domain_release(struct device *dev) +{ + struct tb *tb = container_of(dev, struct tb, dev); + + tb_ctl_free(tb->ctl); + destroy_workqueue(tb->wq); + ida_simple_remove(&tb_domain_ida, tb->index); + mutex_destroy(&tb->lock); + kfree(tb); +} + +struct device_type tb_domain_type = { + .name = "thunderbolt_domain", + .release = tb_domain_release, +}; + +/** + * tb_domain_alloc() - Allocate a domain + * @nhi: Pointer to the host controller + * @privsize: Size of the connection manager private data + * + * Allocates and initializes a new Thunderbolt domain. Connection + * managers are expected to call this and then fill in @cm_ops + * accordingly. + * + * Call tb_domain_put() to release the domain before it has been added + * to the system. + * + * Return: allocated domain structure on %NULL in case of error + */ +struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize) +{ + struct tb *tb; + + /* + * Make sure the structure sizes map with that the hardware + * expects because bit-fields are being used. + */ + BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4); + BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4); + BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4); + + tb = kzalloc(sizeof(*tb) + privsize, GFP_KERNEL); + if (!tb) + return NULL; + + tb->nhi = nhi; + mutex_init(&tb->lock); + + tb->index = ida_simple_get(&tb_domain_ida, 0, 0, GFP_KERNEL); + if (tb->index < 0) + goto err_free; + + tb->wq = alloc_ordered_workqueue("thunderbolt%d", 0, tb->index); + if (!tb->wq) + goto err_remove_ida; + + tb->dev.parent = &nhi->pdev->dev; + tb->dev.bus = &tb_bus_type; + tb->dev.type = &tb_domain_type; + dev_set_name(&tb->dev, "domain%d", tb->index); + device_initialize(&tb->dev); + + return tb; + +err_remove_ida: + ida_simple_remove(&tb_domain_ida, tb->index); +err_free: + kfree(tb); + + return NULL; +} + +/** + * tb_domain_add() - Add domain to the system + * @tb: Domain to add + * + * Starts the domain and adds it to the system. Hotplugging devices will + * work after this has been returned successfully. In order to remove + * and release the domain after this function has been called, call + * tb_domain_remove(). + * + * Return: %0 in case of success and negative errno in case of error + */ +int tb_domain_add(struct tb *tb) +{ + int ret; + + if (WARN_ON(!tb->cm_ops)) + return -EINVAL; + + mutex_lock(&tb->lock); + + tb->ctl = tb_ctl_alloc(tb->nhi, tb->cm_ops->hotplug, tb); + if (!tb->ctl) { + ret = -ENOMEM; + goto err_unlock; + } + + /* + * tb_schedule_hotplug_handler may be called as soon as the config + * channel is started. Thats why we have to hold the lock here. + */ + tb_ctl_start(tb->ctl); + + ret = device_add(&tb->dev); + if (ret) + goto err_ctl_stop; + + /* Start the domain */ + if (tb->cm_ops->start) { + ret = tb->cm_ops->start(tb); + if (ret) + goto err_domain_del; + } + + /* This starts event processing */ + mutex_unlock(&tb->lock); + + return 0; + +err_domain_del: + device_del(&tb->dev); +err_ctl_stop: + tb_ctl_stop(tb->ctl); +err_unlock: + mutex_unlock(&tb->lock); + + return ret; +} + +/** + * tb_domain_remove() - Removes and releases a domain + * @tb: Domain to remove + * + * Stops the domain, removes it from the system and releases all + * resources once the last reference has been released. + */ +void tb_domain_remove(struct tb *tb) +{ + mutex_lock(&tb->lock); + if (tb->cm_ops->stop) + tb->cm_ops->stop(tb); + /* Stop the domain control traffic */ + tb_ctl_stop(tb->ctl); + mutex_unlock(&tb->lock); + + flush_workqueue(tb->wq); + device_unregister(&tb->dev); +} + +/** + * tb_domain_suspend_noirq() - Suspend a domain + * @tb: Domain to suspend + * + * Suspends all devices in the domain and stops the control channel. + */ +int tb_domain_suspend_noirq(struct tb *tb) +{ + int ret = 0; + + /* + * The control channel interrupt is left enabled during suspend + * and taking the lock here prevents any events happening before + * we actually have stopped the domain and the control channel. + */ + mutex_lock(&tb->lock); + if (tb->cm_ops->suspend_noirq) + ret = tb->cm_ops->suspend_noirq(tb); + if (!ret) + tb_ctl_stop(tb->ctl); + mutex_unlock(&tb->lock); + + return ret; +} + +/** + * tb_domain_resume_noirq() - Resume a domain + * @tb: Domain to resume + * + * Re-starts the control channel, and resumes all devices connected to + * the domain. + */ +int tb_domain_resume_noirq(struct tb *tb) +{ + int ret = 0; + + mutex_lock(&tb->lock); + tb_ctl_start(tb->ctl); + if (tb->cm_ops->resume_noirq) + ret = tb->cm_ops->resume_noirq(tb); + mutex_unlock(&tb->lock); + + return ret; +} + +int tb_domain_init(void) +{ + return bus_register(&tb_bus_type); +} + +void tb_domain_exit(void) +{ + bus_unregister(&tb_bus_type); + ida_destroy(&tb_domain_ida); +} diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index ed75c49748f5..c1113a3c4128 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -586,16 +586,16 @@ static int nhi_suspend_noirq(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); struct tb *tb = pci_get_drvdata(pdev); - thunderbolt_suspend(tb); - return 0; + + return tb_domain_suspend_noirq(tb); } static int nhi_resume_noirq(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); struct tb *tb = pci_get_drvdata(pdev); - thunderbolt_resume(tb); - return 0; + + return tb_domain_resume_noirq(tb); } static void nhi_shutdown(struct tb_nhi *nhi) @@ -715,12 +715,17 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) iowrite32(3906250 / 10000, nhi->iobase + 0x38c00); dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); - tb = thunderbolt_alloc_and_start(nhi); - if (!tb) { + tb = tb_probe(nhi); + if (!tb) + return -ENODEV; + + res = tb_domain_add(tb); + if (res) { /* * At this point the RX/TX rings might already have been * activated. Do a proper shutdown. */ + tb_domain_put(tb); nhi_shutdown(nhi); return -EIO; } @@ -733,7 +738,8 @@ static void nhi_remove(struct pci_dev *pdev) { struct tb *tb = pci_get_drvdata(pdev); struct tb_nhi *nhi = tb->nhi; - thunderbolt_shutdown_and_free(tb); + + tb_domain_remove(tb); nhi_shutdown(nhi); } @@ -797,14 +803,23 @@ static struct pci_driver nhi_driver = { static int __init nhi_init(void) { + int ret; + if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc.")) return -ENOSYS; - return pci_register_driver(&nhi_driver); + ret = tb_domain_init(); + if (ret) + return ret; + ret = pci_register_driver(&nhi_driver); + if (ret) + tb_domain_exit(); + return ret; } static void __exit nhi_unload(void) { pci_unregister_driver(&nhi_driver); + tb_domain_exit(); } module_init(nhi_init); diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 6b44076e1380..9f00a0f28d53 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -12,6 +12,18 @@ #include "tb_regs.h" #include "tunnel_pci.h" +/** + * struct tb_cm - Simple Thunderbolt connection manager + * @tunnel_list: List of active tunnels + * @hotplug_active: tb_handle_hotplug will stop progressing plug + * events and exit if this is not set (it needs to + * acquire the lock one more time). Used to drain wq + * after cfg has been paused. + */ +struct tb_cm { + struct list_head tunnel_list; + bool hotplug_active; +}; /* enumeration & hot plug handling */ @@ -62,12 +74,14 @@ static void tb_scan_port(struct tb_port *port) */ static void tb_free_invalid_tunnels(struct tb *tb) { + struct tb_cm *tcm = tb_priv(tb); struct tb_pci_tunnel *tunnel; struct tb_pci_tunnel *n; - list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list) - { + + list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { if (tb_pci_is_invalid(tunnel)) { tb_pci_deactivate(tunnel); + list_del(&tunnel->list); tb_pci_free(tunnel); } } @@ -149,6 +163,8 @@ static void tb_activate_pcie_devices(struct tb *tb) struct tb_port *up_port; struct tb_port *down_port; struct tb_pci_tunnel *tunnel; + struct tb_cm *tcm = tb_priv(tb); + /* scan for pcie devices at depth 1*/ for (i = 1; i <= tb->root_switch->config.max_port_number; i++) { if (tb_is_upstream_port(&tb->root_switch->ports[i])) @@ -195,6 +211,7 @@ static void tb_activate_pcie_devices(struct tb *tb) tb_pci_free(tunnel); } + list_add(&tunnel->list, &tcm->tunnel_list); } } @@ -217,10 +234,11 @@ static void tb_handle_hotplug(struct work_struct *work) { struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); struct tb *tb = ev->tb; + struct tb_cm *tcm = tb_priv(tb); struct tb_switch *sw; struct tb_port *port; mutex_lock(&tb->lock); - if (!tb->hotplug_active) + if (!tcm->hotplug_active) goto out; /* during init, suspend or shutdown */ sw = get_switch_at_route(tb->root_switch, ev->route); @@ -296,22 +314,14 @@ static void tb_schedule_hotplug_handler(void *data, u64 route, u8 port, queue_work(tb->wq, &ev->work); } -/** - * thunderbolt_shutdown_and_free() - shutdown everything - * - * Free all switches and the config channel. - * - * Used in the error path of thunderbolt_alloc_and_start. - */ -void thunderbolt_shutdown_and_free(struct tb *tb) +static void tb_stop(struct tb *tb) { + struct tb_cm *tcm = tb_priv(tb); struct tb_pci_tunnel *tunnel; struct tb_pci_tunnel *n; - mutex_lock(&tb->lock); - /* tunnels are only present after everything has been initialized */ - list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list) { + list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { tb_pci_deactivate(tunnel); tb_pci_free(tunnel); } @@ -320,98 +330,44 @@ void thunderbolt_shutdown_and_free(struct tb *tb) tb_switch_free(tb->root_switch); tb->root_switch = NULL; - if (tb->ctl) { - tb_ctl_stop(tb->ctl); - tb_ctl_free(tb->ctl); - } - tb->ctl = NULL; - tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */ - - /* allow tb_handle_hotplug to acquire the lock */ - mutex_unlock(&tb->lock); - if (tb->wq) { - flush_workqueue(tb->wq); - destroy_workqueue(tb->wq); - tb->wq = NULL; - } - mutex_destroy(&tb->lock); - kfree(tb); + tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ } -/** - * thunderbolt_alloc_and_start() - setup the thunderbolt bus - * - * Allocates a tb_cfg control channel, initializes the root switch, enables - * plug events and activates pci devices. - * - * Return: Returns NULL on error. - */ -struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi) +static int tb_start(struct tb *tb) { - struct tb *tb; - - BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4); - BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4); - BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4); - - tb = kzalloc(sizeof(*tb), GFP_KERNEL); - if (!tb) - return NULL; - - tb->nhi = nhi; - mutex_init(&tb->lock); - mutex_lock(&tb->lock); - INIT_LIST_HEAD(&tb->tunnel_list); - - tb->wq = alloc_ordered_workqueue("thunderbolt", 0); - if (!tb->wq) - goto err_locked; - - tb->ctl = tb_ctl_alloc(tb->nhi, tb_schedule_hotplug_handler, tb); - if (!tb->ctl) - goto err_locked; - /* - * tb_schedule_hotplug_handler may be called as soon as the config - * channel is started. Thats why we have to hold the lock here. - */ - tb_ctl_start(tb->ctl); + struct tb_cm *tcm = tb_priv(tb); tb->root_switch = tb_switch_alloc(tb, 0); if (!tb->root_switch) - goto err_locked; + return -ENOMEM; /* Full scan to discover devices added before the driver was loaded. */ tb_scan_switch(tb->root_switch); tb_activate_pcie_devices(tb); /* Allow tb_handle_hotplug to progress events */ - tb->hotplug_active = true; - mutex_unlock(&tb->lock); - return tb; - -err_locked: - mutex_unlock(&tb->lock); - thunderbolt_shutdown_and_free(tb); - return NULL; + tcm->hotplug_active = true; + return 0; } -void thunderbolt_suspend(struct tb *tb) +static int tb_suspend_noirq(struct tb *tb) { + struct tb_cm *tcm = tb_priv(tb); + tb_info(tb, "suspending...\n"); - mutex_lock(&tb->lock); tb_switch_suspend(tb->root_switch); - tb_ctl_stop(tb->ctl); - tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */ - mutex_unlock(&tb->lock); + tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ tb_info(tb, "suspend finished\n"); + + return 0; } -void thunderbolt_resume(struct tb *tb) +static int tb_resume_noirq(struct tb *tb) { + struct tb_cm *tcm = tb_priv(tb); struct tb_pci_tunnel *tunnel, *n; + tb_info(tb, "resuming...\n"); - mutex_lock(&tb->lock); - tb_ctl_start(tb->ctl); /* remove any pci devices the firmware might have setup */ tb_switch_reset(tb, 0); @@ -419,9 +375,9 @@ void thunderbolt_resume(struct tb *tb) tb_switch_resume(tb->root_switch); tb_free_invalid_tunnels(tb); tb_free_unplugged_children(tb->root_switch); - list_for_each_entry_safe(tunnel, n, &tb->tunnel_list, list) + list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) tb_pci_restart(tunnel); - if (!list_empty(&tb->tunnel_list)) { + if (!list_empty(&tcm->tunnel_list)) { /* * the pcie links need some time to get going. * 100ms works for me... @@ -430,7 +386,33 @@ void thunderbolt_resume(struct tb *tb) msleep(100); } /* Allow tb_handle_hotplug to progress events */ - tb->hotplug_active = true; - mutex_unlock(&tb->lock); + tcm->hotplug_active = true; tb_info(tb, "resume finished\n"); + + return 0; +} + +static const struct tb_cm_ops tb_cm_ops = { + .start = tb_start, + .stop = tb_stop, + .suspend_noirq = tb_suspend_noirq, + .resume_noirq = tb_resume_noirq, + .hotplug = tb_schedule_hotplug_handler, +}; + +struct tb *tb_probe(struct tb_nhi *nhi) +{ + struct tb_cm *tcm; + struct tb *tb; + + tb = tb_domain_alloc(nhi, sizeof(*tcm)); + if (!tb) + return NULL; + + tb->cm_ops = &tb_cm_ops; + + tcm = tb_priv(tb); + INIT_LIST_HEAD(&tcm->tunnel_list); + + return tb; } diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 0b78bc4fbe61..5fab4c44f124 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -92,29 +92,52 @@ struct tb_path { int path_length; /* number of hops */ }; +/** + * struct tb_cm_ops - Connection manager specific operations vector + * @start: Starts the domain + * @stop: Stops the domain + * @suspend_noirq: Connection manager specific suspend_noirq + * @resume_noirq: Connection manager specific resume_noirq + * @hotplug: Handle hotplug event + */ +struct tb_cm_ops { + int (*start)(struct tb *tb); + void (*stop)(struct tb *tb); + int (*suspend_noirq)(struct tb *tb); + int (*resume_noirq)(struct tb *tb); + hotplug_cb hotplug; +}; /** * struct tb - main thunderbolt bus structure + * @dev: Domain device + * @lock: Big lock. Must be held when accessing cfg or any struct + * tb_switch / struct tb_port. + * @nhi: Pointer to the NHI structure + * @ctl: Control channel for this domain + * @wq: Ordered workqueue for all domain specific work + * @root_switch: Root switch of this domain + * @cm_ops: Connection manager specific operations vector + * @index: Linux assigned domain number + * @privdata: Private connection manager specific data */ struct tb { - struct mutex lock; /* - * Big lock. Must be held when accessing cfg or - * any struct tb_switch / struct tb_port. - */ + struct device dev; + struct mutex lock; struct tb_nhi *nhi; struct tb_ctl *ctl; - struct workqueue_struct *wq; /* ordered workqueue for plug events */ + struct workqueue_struct *wq; struct tb_switch *root_switch; - struct list_head tunnel_list; /* list of active PCIe tunnels */ - bool hotplug_active; /* - * tb_handle_hotplug will stop progressing plug - * events and exit if this is not set (it needs to - * acquire the lock one more time). Used to drain - * wq after cfg has been paused. - */ - + const struct tb_cm_ops *cm_ops; + int index; + unsigned long privdata[0]; }; +static inline void *tb_priv(struct tb *tb) +{ + return (void *)tb->privdata; +} + /* helper functions & macros */ /** @@ -215,11 +238,24 @@ static inline int tb_port_write(struct tb_port *port, const void *buffer, #define tb_port_info(port, fmt, arg...) \ __TB_PORT_PRINT(tb_info, port, fmt, ##arg) +struct tb *tb_probe(struct tb_nhi *nhi); + +extern struct bus_type tb_bus_type; +extern struct device_type tb_domain_type; + +int tb_domain_init(void); +void tb_domain_exit(void); -struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi); -void thunderbolt_shutdown_and_free(struct tb *tb); -void thunderbolt_suspend(struct tb *tb); -void thunderbolt_resume(struct tb *tb); +struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize); +int tb_domain_add(struct tb *tb); +void tb_domain_remove(struct tb *tb); +int tb_domain_suspend_noirq(struct tb *tb); +int tb_domain_resume_noirq(struct tb *tb); + +static inline void tb_domain_put(struct tb *tb) +{ + put_device(&tb->dev); +} struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route); void tb_switch_free(struct tb_switch *sw); diff --git a/drivers/thunderbolt/tunnel_pci.c b/drivers/thunderbolt/tunnel_pci.c index f4ce9845e42a..ca4475907d7a 100644 --- a/drivers/thunderbolt/tunnel_pci.c +++ b/drivers/thunderbolt/tunnel_pci.c @@ -194,19 +194,13 @@ err: */ int tb_pci_activate(struct tb_pci_tunnel *tunnel) { - int res; if (tunnel->path_to_up->activated || tunnel->path_to_down->activated) { tb_tunnel_WARN(tunnel, "trying to activate an already activated tunnel\n"); return -EINVAL; } - res = tb_pci_restart(tunnel); - if (res) - return res; - - list_add(&tunnel->list, &tunnel->tb->tunnel_list); - return 0; + return tb_pci_restart(tunnel); } @@ -227,6 +221,5 @@ void tb_pci_deactivate(struct tb_pci_tunnel *tunnel) tb_path_deactivate(tunnel->path_to_down); if (tunnel->path_to_up->activated) tb_path_deactivate(tunnel->path_to_up); - list_del_init(&tunnel->list); } -- cgit v1.2.3 From bfe778ac49826ced3dceb6416038e1cd887ce2bd Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:01 +0300 Subject: thunderbolt: Convert switch to a device Thunderbolt domain consists of switches that are connected to each other, forming a bus. This will convert each switch into a real Linux device structure and adds them to the domain. The advantage here is that we get all the goodies from the driver core, like reference counting and sysfs hierarchy for free. Also expose device identification information to the userspace via new sysfs attributes. In order to support internal connection manager (ICM) we separate switch configuration into its own function (tb_switch_configure()) which is only called by the existing native connection manager implementation used on Macs. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-bus-thunderbolt | 22 ++ drivers/thunderbolt/eeprom.c | 2 + drivers/thunderbolt/switch.c | 261 +++++++++++++++++++----- drivers/thunderbolt/tb.c | 40 +++- drivers/thunderbolt/tb.h | 45 +++- 5 files changed, 303 insertions(+), 67 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-thunderbolt diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt new file mode 100644 index 000000000000..9f1bd0086938 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt @@ -0,0 +1,22 @@ +What: /sys/bus/thunderbolt/devices/.../device +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute contains id of this device extracted from + the device DROM. + +What: /sys/bus/thunderbolt/devices/.../vendor +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute contains vendor id of this device extracted + from the device DROM. + +What: /sys/bus/thunderbolt/devices/.../unique_id +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute contains unique_id string of this device. + This is either read from hardware registers (UUID on + newer hardware) or based on UID from the device DROM. + Can be used to uniquely identify particular device. diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index eb2179c98b09..7e485e3ef27e 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -479,6 +479,8 @@ parse: goto err; } sw->uid = header->uid; + sw->vendor = header->vendor_id; + sw->device = header->model_id; crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len); if (crc != header->data_crc32) { diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index b379b4183bac..0475bfc6c208 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -281,6 +281,9 @@ static int tb_plug_events_active(struct tb_switch *sw, bool active) u32 data; int res; + if (!sw->config.enabled) + return 0; + sw->config.plug_events_delay = 0xff; res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1); if (res) @@ -307,36 +310,79 @@ static int tb_plug_events_active(struct tb_switch *sw, bool active) sw->cap_plug_events + 1, 1); } +static ssize_t device_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); -/** - * tb_switch_free() - free a tb_switch and all downstream switches - */ -void tb_switch_free(struct tb_switch *sw) + return sprintf(buf, "%#x\n", sw->device); +} +static DEVICE_ATTR_RO(device); + +static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, + char *buf) { - int i; - /* port 0 is the switch itself and never has a remote */ - for (i = 1; i <= sw->config.max_port_number; i++) { - if (tb_is_upstream_port(&sw->ports[i])) - continue; - if (sw->ports[i].remote) - tb_switch_free(sw->ports[i].remote->sw); - sw->ports[i].remote = NULL; - } + struct tb_switch *sw = tb_to_switch(dev); - if (!sw->is_unplugged) - tb_plug_events_active(sw, false); + return sprintf(buf, "%#x\n", sw->vendor); +} +static DEVICE_ATTR_RO(vendor); + +static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + + return sprintf(buf, "%pUb\n", sw->uuid); +} +static DEVICE_ATTR_RO(unique_id); + +static struct attribute *switch_attrs[] = { + &dev_attr_device.attr, + &dev_attr_vendor.attr, + &dev_attr_unique_id.attr, + NULL, +}; + +static struct attribute_group switch_group = { + .attrs = switch_attrs, +}; +static const struct attribute_group *switch_groups[] = { + &switch_group, + NULL, +}; + +static void tb_switch_release(struct device *dev) +{ + struct tb_switch *sw = tb_to_switch(dev); + + kfree(sw->uuid); kfree(sw->ports); kfree(sw->drom); kfree(sw); } +struct device_type tb_switch_type = { + .name = "thunderbolt_device", + .release = tb_switch_release, +}; + /** - * tb_switch_alloc() - allocate and initialize a switch + * tb_switch_alloc() - allocate a switch + * @tb: Pointer to the owning domain + * @parent: Parent device for this switch + * @route: Route string for this switch * - * Return: Returns a NULL on failure. + * Allocates and initializes a switch. Will not upload configuration to + * the switch. For that you need to call tb_switch_configure() + * separately. The returned switch should be released by calling + * tb_switch_put(). + * + * Return: Pointer to the allocated switch or %NULL in case of failure */ -struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) +struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, + u64 route) { int i; int cap; @@ -351,11 +397,9 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) sw->tb = tb; if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5)) - goto err; - tb_info(tb, - "initializing Switch at %#llx (depth: %d, up port: %d)\n", - route, tb_route_length(route), upstream_port); - tb_info(tb, "old switch config:\n"); + goto err_free_sw_ports; + + tb_info(tb, "current switch config:\n"); tb_dump_switch(tb, &sw->config); /* configure switch */ @@ -363,30 +407,13 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) sw->config.depth = tb_route_length(route); sw->config.route_lo = route; sw->config.route_hi = route >> 32; - sw->config.enabled = 1; - /* from here on we may use the tb_sw_* functions & macros */ - - if (sw->config.vendor_id != 0x8086) - tb_sw_warn(sw, "unknown switch vendor id %#x\n", - sw->config.vendor_id); - - if (sw->config.device_id != PCI_DEVICE_ID_INTEL_LIGHT_RIDGE && - sw->config.device_id != PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C && - sw->config.device_id != PCI_DEVICE_ID_INTEL_PORT_RIDGE && - sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE && - sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE) - tb_sw_warn(sw, "unsupported switch device id %#x\n", - sw->config.device_id); - - /* upload configuration */ - if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3)) - goto err; + sw->config.enabled = 0; /* initialize ports */ sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports), GFP_KERNEL); if (!sw->ports) - goto err; + goto err_free_sw_ports; for (i = 0; i <= sw->config.max_port_number; i++) { /* minimum setup for tb_find_cap and tb_drom_read to work */ @@ -397,35 +424,161 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS); if (cap < 0) { tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n"); - goto err; + goto err_free_sw_ports; } sw->cap_plug_events = cap; + device_initialize(&sw->dev); + sw->dev.parent = parent; + sw->dev.bus = &tb_bus_type; + sw->dev.type = &tb_switch_type; + sw->dev.groups = switch_groups; + dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw)); + + return sw; + +err_free_sw_ports: + kfree(sw->ports); + kfree(sw); + + return NULL; +} + +/** + * tb_switch_configure() - Uploads configuration to the switch + * @sw: Switch to configure + * + * Call this function before the switch is added to the system. It will + * upload configuration to the switch and makes it available for the + * connection manager to use. + * + * Return: %0 in case of success and negative errno in case of failure + */ +int tb_switch_configure(struct tb_switch *sw) +{ + struct tb *tb = sw->tb; + u64 route; + int ret; + + route = tb_route(sw); + tb_info(tb, + "initializing Switch at %#llx (depth: %d, up port: %d)\n", + route, tb_route_length(route), sw->config.upstream_port_number); + + if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL) + tb_sw_warn(sw, "unknown switch vendor id %#x\n", + sw->config.vendor_id); + + if (sw->config.device_id != PCI_DEVICE_ID_INTEL_LIGHT_RIDGE && + sw->config.device_id != PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C && + sw->config.device_id != PCI_DEVICE_ID_INTEL_PORT_RIDGE && + sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE && + sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE) + tb_sw_warn(sw, "unsupported switch device id %#x\n", + sw->config.device_id); + + sw->config.enabled = 1; + + /* upload configuration */ + ret = tb_sw_write(sw, 1 + (u32 *)&sw->config, TB_CFG_SWITCH, 1, 3); + if (ret) + return ret; + + return tb_plug_events_active(sw, true); +} + +static void tb_switch_set_uuid(struct tb_switch *sw) +{ + u32 uuid[4]; + int cap; + + if (sw->uuid) + return; + + /* + * The newer controllers include fused UUID as part of link + * controller specific registers + */ + cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER); + if (cap > 0) { + tb_sw_read(sw, uuid, TB_CFG_SWITCH, cap + 3, 4); + } else { + /* + * ICM generates UUID based on UID and fills the upper + * two words with ones. This is not strictly following + * UUID format but we want to be compatible with it so + * we do the same here. + */ + uuid[0] = sw->uid & 0xffffffff; + uuid[1] = (sw->uid >> 32) & 0xffffffff; + uuid[2] = 0xffffffff; + uuid[3] = 0xffffffff; + } + + sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); +} + +/** + * tb_switch_add() - Add a switch to the domain + * @sw: Switch to add + * + * This is the last step in adding switch to the domain. It will read + * identification information from DROM and initializes ports so that + * they can be used to connect other switches. The switch will be + * exposed to the userspace when this function successfully returns. To + * remove and release the switch, call tb_switch_remove(). + * + * Return: %0 in case of success and negative errno in case of failure + */ +int tb_switch_add(struct tb_switch *sw) +{ + int i, ret; + /* read drom */ if (tb_drom_read(sw)) tb_sw_warn(sw, "tb_eeprom_read_rom failed, continuing\n"); tb_sw_info(sw, "uid: %#llx\n", sw->uid); + tb_switch_set_uuid(sw); + for (i = 0; i <= sw->config.max_port_number; i++) { if (sw->ports[i].disabled) { tb_port_info(&sw->ports[i], "disabled by eeprom\n"); continue; } - if (tb_init_port(&sw->ports[i])) - goto err; + ret = tb_init_port(&sw->ports[i]); + if (ret) + return ret; } - /* TODO: I2C, IECS, link controller */ + return device_add(&sw->dev); +} - if (tb_plug_events_active(sw, true)) - goto err; +/** + * tb_switch_remove() - Remove and release a switch + * @sw: Switch to remove + * + * This will remove the switch from the domain and release it after last + * reference count drops to zero. If there are switches connected below + * this switch, they will be removed as well. + */ +void tb_switch_remove(struct tb_switch *sw) +{ + int i; - return sw; -err: - kfree(sw->ports); - kfree(sw->drom); - kfree(sw); - return NULL; + /* port 0 is the switch itself and never has a remote */ + for (i = 1; i <= sw->config.max_port_number; i++) { + if (tb_is_upstream_port(&sw->ports[i])) + continue; + if (sw->ports[i].remote) + tb_switch_remove(sw->ports[i].remote->sw); + sw->ports[i].remote = NULL; + } + + if (!sw->is_unplugged) + tb_plug_events_active(sw, false); + + device_unregister(&sw->dev); } /** diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 9f00a0f28d53..94ecac012428 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -61,9 +61,21 @@ static void tb_scan_port(struct tb_port *port) tb_port_WARN(port, "port already has a remote!\n"); return; } - sw = tb_switch_alloc(port->sw->tb, tb_downstream_route(port)); + sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, + tb_downstream_route(port)); if (!sw) return; + + if (tb_switch_configure(sw)) { + tb_switch_put(sw); + return; + } + + if (tb_switch_add(sw)) { + tb_switch_put(sw); + return; + } + port->remote = tb_upstream_port(sw); tb_upstream_port(sw)->remote = port; tb_scan_switch(sw); @@ -100,7 +112,7 @@ static void tb_free_unplugged_children(struct tb_switch *sw) if (!port->remote) continue; if (port->remote->sw->is_unplugged) { - tb_switch_free(port->remote->sw); + tb_switch_remove(port->remote->sw); port->remote = NULL; } else { tb_free_unplugged_children(port->remote->sw); @@ -266,7 +278,7 @@ static void tb_handle_hotplug(struct work_struct *work) tb_port_info(port, "unplugged\n"); tb_sw_set_unplugged(port->remote->sw); tb_free_invalid_tunnels(tb); - tb_switch_free(port->remote->sw); + tb_switch_remove(port->remote->sw); port->remote = NULL; } else { tb_port_info(port, @@ -325,22 +337,32 @@ static void tb_stop(struct tb *tb) tb_pci_deactivate(tunnel); tb_pci_free(tunnel); } - - if (tb->root_switch) - tb_switch_free(tb->root_switch); - tb->root_switch = NULL; - + tb_switch_remove(tb->root_switch); tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ } static int tb_start(struct tb *tb) { struct tb_cm *tcm = tb_priv(tb); + int ret; - tb->root_switch = tb_switch_alloc(tb, 0); + tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); if (!tb->root_switch) return -ENOMEM; + ret = tb_switch_configure(tb->root_switch); + if (ret) { + tb_switch_put(tb->root_switch); + return ret; + } + + /* Announce the switch to the world */ + ret = tb_switch_add(tb->root_switch); + if (ret) { + tb_switch_put(tb->root_switch); + return ret; + } + /* Full scan to discover devices added before the driver was loaded. */ tb_scan_switch(tb->root_switch); tb_activate_pcie_devices(tb); diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 5fab4c44f124..f7dfe733d71a 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -8,20 +8,36 @@ #define TB_H_ #include +#include #include "tb_regs.h" #include "ctl.h" /** * struct tb_switch - a thunderbolt switch + * @dev: Device for the switch + * @config: Switch configuration + * @ports: Ports in this switch + * @tb: Pointer to the domain the switch belongs to + * @uid: Unique ID of the switch + * @uuid: UUID of the switch (or %NULL if not supported) + * @vendor: Vendor ID of the switch + * @device: Device ID of the switch + * @cap_plug_events: Offset to the plug events capability (%0 if not found) + * @is_unplugged: The switch is going away + * @drom: DROM of the switch (%NULL if not found) */ struct tb_switch { + struct device dev; struct tb_regs_switch_header config; struct tb_port *ports; struct tb *tb; u64 uid; - int cap_plug_events; /* offset, zero if not found */ - bool is_unplugged; /* unplugged, will go away */ + uuid_be *uuid; + u16 vendor; + u16 device; + int cap_plug_events; + bool is_unplugged; u8 *drom; }; @@ -242,6 +258,7 @@ struct tb *tb_probe(struct tb_nhi *nhi); extern struct bus_type tb_bus_type; extern struct device_type tb_domain_type; +extern struct device_type tb_switch_type; int tb_domain_init(void); void tb_domain_exit(void); @@ -257,14 +274,34 @@ static inline void tb_domain_put(struct tb *tb) put_device(&tb->dev); } -struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route); -void tb_switch_free(struct tb_switch *sw); +struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, + u64 route); +int tb_switch_configure(struct tb_switch *sw); +int tb_switch_add(struct tb_switch *sw); +void tb_switch_remove(struct tb_switch *sw); void tb_switch_suspend(struct tb_switch *sw); int tb_switch_resume(struct tb_switch *sw); int tb_switch_reset(struct tb *tb, u64 route); void tb_sw_set_unplugged(struct tb_switch *sw); struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route); +static inline void tb_switch_put(struct tb_switch *sw) +{ + put_device(&sw->dev); +} + +static inline bool tb_is_switch(const struct device *dev) +{ + return dev->type == &tb_switch_type; +} + +static inline struct tb_switch *tb_to_switch(struct device *dev) +{ + if (tb_is_switch(dev)) + return container_of(dev, struct tb_switch, dev); + return NULL; +} + int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged); int tb_port_add_nfc_credits(struct tb_port *port, int credits); int tb_port_clear_counter(struct tb_port *port, int counter); -- cgit v1.2.3 From f53e7676046db175dc6ac78d429dd5077a9afbba Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:02 +0300 Subject: thunderbolt: Fail switch adding operation if reading DROM fails All non-root switches are expected to have DROM so if the operation fails, it might be due the user unlugging the device. There is no point continuing adding the switch further in that case. Just bail out. For root switches (hosts) the DROM is either retrieved from a EFI variable, NVM or hard-coded. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 0475bfc6c208..2390f08b94da 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -535,8 +535,11 @@ int tb_switch_add(struct tb_switch *sw) int i, ret; /* read drom */ - if (tb_drom_read(sw)) - tb_sw_warn(sw, "tb_eeprom_read_rom failed, continuing\n"); + ret = tb_drom_read(sw); + if (ret) { + tb_sw_warn(sw, "tb_eeprom_read_rom failed\n"); + return ret; + } tb_sw_info(sw, "uid: %#llx\n", sw->uid); tb_switch_set_uuid(sw); -- cgit v1.2.3 From 390229455535d75a9bdd19437054413d677fc7b0 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:03 +0300 Subject: thunderbolt: Do not fail if DROM data CRC32 is invalid There are devices out there where CRC32 of the DROM is not correct. One reason for this is that the ICM firmware does not validate it and it seems that neither does the Apple driver. To be able to support such devices we continue parsing the DROM contents regardless of whether CRC32 failed or not. We still keep the warning there. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/eeprom.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index 7e485e3ef27e..e2c1f8a45522 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -485,9 +485,8 @@ parse: crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len); if (crc != header->data_crc32) { tb_sw_warn(sw, - "drom data crc32 mismatch (expected: %#x, got: %#x), aborting\n", + "drom data crc32 mismatch (expected: %#x, got: %#x), continuing\n", header->data_crc32, crc); - goto err; } if (header->device_rom_revision > 2) -- cgit v1.2.3 From 02b17a41ad102934a3772ffc82f345345c232ee4 Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Tue, 6 Jun 2017 15:25:04 +0300 Subject: thunderbolt: Refactor and fix parsing of port drom entries Currently tb_drom_parse_entry() is only able to parse drom entries of type TB_DROM_ENTRY_PORT. Rename it to tb_drom_parse_entry_port(). Fold tb_drom_parse_port_entry() into it. Its return value is currently ignored. Evaluate it and abort parsing on error. Change tb_drom_parse_entries() to accommodate for parsing of other entry types than TB_DROM_ENTRY_PORT. Signed-off-by: Lukas Wunner Signed-off-by: Mika Westerberg Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/eeprom.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index e2c1f8a45522..5c7d80a109b1 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -295,25 +295,13 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid) return 0; } -static void tb_drom_parse_port_entry(struct tb_port *port, - struct tb_drom_entry_port *entry) -{ - port->link_nr = entry->link_nr; - if (entry->has_dual_link_port) - port->dual_link_port = - &port->sw->ports[entry->dual_link_port_nr]; -} - -static int tb_drom_parse_entry(struct tb_switch *sw, - struct tb_drom_entry_header *header) +static int tb_drom_parse_entry_port(struct tb_switch *sw, + struct tb_drom_entry_header *header) { struct tb_port *port; int res; enum tb_port_type type; - if (header->type != TB_DROM_ENTRY_PORT) - return 0; - port = &sw->ports[header->index]; port->disabled = header->port_disabled; if (port->disabled) @@ -332,7 +320,10 @@ static int tb_drom_parse_entry(struct tb_switch *sw, header->len, sizeof(struct tb_drom_entry_port)); return -EIO; } - tb_drom_parse_port_entry(port, entry); + port->link_nr = entry->link_nr; + if (entry->has_dual_link_port) + port->dual_link_port = + &port->sw->ports[entry->dual_link_port_nr]; } return 0; } @@ -347,6 +338,7 @@ static int tb_drom_parse_entries(struct tb_switch *sw) struct tb_drom_header *header = (void *) sw->drom; u16 pos = sizeof(*header); u16 drom_size = header->data_len + TB_DROM_DATA_START; + int res; while (pos < drom_size) { struct tb_drom_entry_header *entry = (void *) (sw->drom + pos); @@ -356,7 +348,15 @@ static int tb_drom_parse_entries(struct tb_switch *sw) return -EIO; } - tb_drom_parse_entry(sw, entry); + switch (entry->type) { + case TB_DROM_ENTRY_GENERIC: + break; + case TB_DROM_ENTRY_PORT: + res = tb_drom_parse_entry_port(sw, entry); + break; + } + if (res) + return res; pos += entry->len; } -- cgit v1.2.3 From 72ee33907b629355d8fd1980140a467041a9f519 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:05 +0300 Subject: thunderbolt: Read vendor and device name from DROM The device DROM contains name of the vendor and device among other things. Extract this information and expose it to the userspace via two new attributes. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-bus-thunderbolt | 14 +++++++++++ drivers/thunderbolt/eeprom.c | 32 +++++++++++++++++++++++++ drivers/thunderbolt/switch.c | 22 +++++++++++++++++ drivers/thunderbolt/tb.h | 4 ++++ 4 files changed, 72 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt index 9f1bd0086938..29a516f53d2c 100644 --- a/Documentation/ABI/testing/sysfs-bus-thunderbolt +++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt @@ -5,6 +5,13 @@ Contact: thunderbolt-software@lists.01.org Description: This attribute contains id of this device extracted from the device DROM. +What: /sys/bus/thunderbolt/devices/.../device_name +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute contains name of this device extracted from + the device DROM. + What: /sys/bus/thunderbolt/devices/.../vendor Date: Sep 2017 KernelVersion: 4.13 @@ -12,6 +19,13 @@ Contact: thunderbolt-software@lists.01.org Description: This attribute contains vendor id of this device extracted from the device DROM. +What: /sys/bus/thunderbolt/devices/.../vendor_name +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute contains vendor name of this device extracted + from the device DROM. + What: /sys/bus/thunderbolt/devices/.../unique_id Date: Sep 2017 KernelVersion: 4.13 diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index 5c7d80a109b1..d40a5f07fc4c 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -204,6 +204,11 @@ struct tb_drom_entry_header { enum tb_drom_entry_type type:1; } __packed; +struct tb_drom_entry_generic { + struct tb_drom_entry_header header; + u8 data[0]; +} __packed; + struct tb_drom_entry_port { /* BYTES 0-1 */ struct tb_drom_entry_header header; @@ -295,6 +300,32 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid) return 0; } +static int tb_drom_parse_entry_generic(struct tb_switch *sw, + struct tb_drom_entry_header *header) +{ + const struct tb_drom_entry_generic *entry = + (const struct tb_drom_entry_generic *)header; + + switch (header->index) { + case 1: + /* Length includes 2 bytes header so remove it before copy */ + sw->vendor_name = kstrndup(entry->data, + header->len - sizeof(*header), GFP_KERNEL); + if (!sw->vendor_name) + return -ENOMEM; + break; + + case 2: + sw->device_name = kstrndup(entry->data, + header->len - sizeof(*header), GFP_KERNEL); + if (!sw->device_name) + return -ENOMEM; + break; + } + + return 0; +} + static int tb_drom_parse_entry_port(struct tb_switch *sw, struct tb_drom_entry_header *header) { @@ -350,6 +381,7 @@ static int tb_drom_parse_entries(struct tb_switch *sw) switch (entry->type) { case TB_DROM_ENTRY_GENERIC: + res = tb_drom_parse_entry_generic(sw, entry); break; case TB_DROM_ENTRY_PORT: res = tb_drom_parse_entry_port(sw, entry); diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 2390f08b94da..11f16a141686 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -319,6 +319,15 @@ static ssize_t device_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(device); +static ssize_t +device_name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + + return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : ""); +} +static DEVICE_ATTR_RO(device_name); + static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -328,6 +337,15 @@ static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(vendor); +static ssize_t +vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + + return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : ""); +} +static DEVICE_ATTR_RO(vendor_name); + static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -339,7 +357,9 @@ static DEVICE_ATTR_RO(unique_id); static struct attribute *switch_attrs[] = { &dev_attr_device.attr, + &dev_attr_device_name.attr, &dev_attr_vendor.attr, + &dev_attr_vendor_name.attr, &dev_attr_unique_id.attr, NULL, }; @@ -358,6 +378,8 @@ static void tb_switch_release(struct device *dev) struct tb_switch *sw = tb_to_switch(dev); kfree(sw->uuid); + kfree(sw->device_name); + kfree(sw->vendor_name); kfree(sw->ports); kfree(sw->drom); kfree(sw); diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index f7dfe733d71a..6d4910ef2eb9 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -23,6 +23,8 @@ * @uuid: UUID of the switch (or %NULL if not supported) * @vendor: Vendor ID of the switch * @device: Device ID of the switch + * @vendor_name: Name of the vendor (or %NULL if not known) + * @device_name: Name of the device (or %NULL if not known) * @cap_plug_events: Offset to the plug events capability (%0 if not found) * @is_unplugged: The switch is going away * @drom: DROM of the switch (%NULL if not found) @@ -36,6 +38,8 @@ struct tb_switch { uuid_be *uuid; u16 vendor; u16 device; + const char *vendor_name; + const char *device_name; int cap_plug_events; bool is_unplugged; u8 *drom; -- cgit v1.2.3 From 32af9434f0b9fd31a68bf5be204667c1e17ddffe Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:06 +0300 Subject: thunderbolt: Move control channel messages to tb_msgs.h We will be forwarding notifications received from the control channel to the connection manager implementations. This way they can decide what to do if anything when a notification is received. To be able to use control channel messages from other files, move them to tb_msgs.h. No functional changes intended. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 76 ----------------------------- drivers/thunderbolt/ctl.h | 16 +------ drivers/thunderbolt/tb_msgs.h | 108 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 109 insertions(+), 91 deletions(-) create mode 100644 drivers/thunderbolt/tb_msgs.h diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index f8290a577b2b..24118c60b062 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -52,82 +52,6 @@ struct tb_ctl { #define tb_ctl_info(ctl, format, arg...) \ dev_info(&(ctl)->nhi->pdev->dev, format, ## arg) - -/* configuration packets definitions */ - -enum tb_cfg_pkg_type { - TB_CFG_PKG_READ = 1, - TB_CFG_PKG_WRITE = 2, - TB_CFG_PKG_ERROR = 3, - TB_CFG_PKG_NOTIFY_ACK = 4, - TB_CFG_PKG_EVENT = 5, - TB_CFG_PKG_XDOMAIN_REQ = 6, - TB_CFG_PKG_XDOMAIN_RESP = 7, - TB_CFG_PKG_OVERRIDE = 8, - TB_CFG_PKG_RESET = 9, - TB_CFG_PKG_PREPARE_TO_SLEEP = 0xd, -}; - -/* common header */ -struct tb_cfg_header { - u32 route_hi:22; - u32 unknown:10; /* highest order bit is set on replies */ - u32 route_lo; -} __packed; - -/* additional header for read/write packets */ -struct tb_cfg_address { - u32 offset:13; /* in dwords */ - u32 length:6; /* in dwords */ - u32 port:6; - enum tb_cfg_space space:2; - u32 seq:2; /* sequence number */ - u32 zero:3; -} __packed; - -/* TB_CFG_PKG_READ, response for TB_CFG_PKG_WRITE */ -struct cfg_read_pkg { - struct tb_cfg_header header; - struct tb_cfg_address addr; -} __packed; - -/* TB_CFG_PKG_WRITE, response for TB_CFG_PKG_READ */ -struct cfg_write_pkg { - struct tb_cfg_header header; - struct tb_cfg_address addr; - u32 data[64]; /* maximum size, tb_cfg_address.length has 6 bits */ -} __packed; - -/* TB_CFG_PKG_ERROR */ -struct cfg_error_pkg { - struct tb_cfg_header header; - enum tb_cfg_error error:4; - u32 zero1:4; - u32 port:6; - u32 zero2:2; /* Both should be zero, still they are different fields. */ - u32 zero3:16; -} __packed; - -/* TB_CFG_PKG_EVENT */ -struct cfg_event_pkg { - struct tb_cfg_header header; - u32 port:6; - u32 zero:25; - bool unplug:1; -} __packed; - -/* TB_CFG_PKG_RESET */ -struct cfg_reset_pkg { - struct tb_cfg_header header; -} __packed; - -/* TB_CFG_PKG_PREPARE_TO_SLEEP */ -struct cfg_pts_pkg { - struct tb_cfg_header header; - u32 data; -} __packed; - - /* utility functions */ static u64 get_route(struct tb_cfg_header header) diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h index 83ae54947082..610980e3232f 100644 --- a/drivers/thunderbolt/ctl.h +++ b/drivers/thunderbolt/ctl.h @@ -8,6 +8,7 @@ #define _TB_CFG #include "nhi.h" +#include "tb_msgs.h" /* control channel */ struct tb_ctl; @@ -23,21 +24,6 @@ void tb_ctl_free(struct tb_ctl *ctl); #define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */ -enum tb_cfg_space { - TB_CFG_HOPS = 0, - TB_CFG_PORT = 1, - TB_CFG_SWITCH = 2, - TB_CFG_COUNTERS = 3, -}; - -enum tb_cfg_error { - TB_CFG_ERROR_PORT_NOT_CONNECTED = 0, - TB_CFG_ERROR_INVALID_CONFIG_SPACE = 2, - TB_CFG_ERROR_NO_SUCH_PORT = 4, - TB_CFG_ERROR_ACK_PLUG_EVENT = 7, /* send as reply to TB_CFG_PKG_EVENT */ - TB_CFG_ERROR_LOOP = 8, -}; - struct tb_cfg_result { u64 response_route; u32 response_port; /* diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h new file mode 100644 index 000000000000..761d56287149 --- /dev/null +++ b/drivers/thunderbolt/tb_msgs.h @@ -0,0 +1,108 @@ +/* + * Thunderbolt control channel messages + * + * Copyright (C) 2014 Andreas Noever + * Copyright (C) 2017, Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _TB_MSGS +#define _TB_MSGS + +#include + +enum tb_cfg_pkg_type { + TB_CFG_PKG_READ = 1, + TB_CFG_PKG_WRITE = 2, + TB_CFG_PKG_ERROR = 3, + TB_CFG_PKG_NOTIFY_ACK = 4, + TB_CFG_PKG_EVENT = 5, + TB_CFG_PKG_XDOMAIN_REQ = 6, + TB_CFG_PKG_XDOMAIN_RESP = 7, + TB_CFG_PKG_OVERRIDE = 8, + TB_CFG_PKG_RESET = 9, + TB_CFG_PKG_PREPARE_TO_SLEEP = 0xd, + +}; + +enum tb_cfg_space { + TB_CFG_HOPS = 0, + TB_CFG_PORT = 1, + TB_CFG_SWITCH = 2, + TB_CFG_COUNTERS = 3, +}; + +enum tb_cfg_error { + TB_CFG_ERROR_PORT_NOT_CONNECTED = 0, + TB_CFG_ERROR_LINK_ERROR = 1, + TB_CFG_ERROR_INVALID_CONFIG_SPACE = 2, + TB_CFG_ERROR_NO_SUCH_PORT = 4, + TB_CFG_ERROR_ACK_PLUG_EVENT = 7, /* send as reply to TB_CFG_PKG_EVENT */ + TB_CFG_ERROR_LOOP = 8, + TB_CFG_ERROR_HEC_ERROR_DETECTED = 12, + TB_CFG_ERROR_FLOW_CONTROL_ERROR = 13, +}; + +/* common header */ +struct tb_cfg_header { + u32 route_hi:22; + u32 unknown:10; /* highest order bit is set on replies */ + u32 route_lo; +} __packed; + +/* additional header for read/write packets */ +struct tb_cfg_address { + u32 offset:13; /* in dwords */ + u32 length:6; /* in dwords */ + u32 port:6; + enum tb_cfg_space space:2; + u32 seq:2; /* sequence number */ + u32 zero:3; +} __packed; + +/* TB_CFG_PKG_READ, response for TB_CFG_PKG_WRITE */ +struct cfg_read_pkg { + struct tb_cfg_header header; + struct tb_cfg_address addr; +} __packed; + +/* TB_CFG_PKG_WRITE, response for TB_CFG_PKG_READ */ +struct cfg_write_pkg { + struct tb_cfg_header header; + struct tb_cfg_address addr; + u32 data[64]; /* maximum size, tb_cfg_address.length has 6 bits */ +} __packed; + +/* TB_CFG_PKG_ERROR */ +struct cfg_error_pkg { + struct tb_cfg_header header; + enum tb_cfg_error error:4; + u32 zero1:4; + u32 port:6; + u32 zero2:2; /* Both should be zero, still they are different fields. */ + u32 zero3:16; +} __packed; + +/* TB_CFG_PKG_EVENT */ +struct cfg_event_pkg { + struct tb_cfg_header header; + u32 port:6; + u32 zero:25; + bool unplug:1; +} __packed; + +/* TB_CFG_PKG_RESET */ +struct cfg_reset_pkg { + struct tb_cfg_header header; +} __packed; + +/* TB_CFG_PKG_PREPARE_TO_SLEEP */ +struct cfg_pts_pkg { + struct tb_cfg_header header; + u32 data; +} __packed; + +#endif -- cgit v1.2.3 From ac6c44de503e51f0eb757e5321724846525cb29f Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:07 +0300 Subject: thunderbolt: Expose get_route() to other files We are going to use it when we change the connection manager to handle events itself. Also rename it to follow naming convention used in functions exposed in ctl.h. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 19 +++++++------------ drivers/thunderbolt/ctl.h | 4 ++++ 2 files changed, 11 insertions(+), 12 deletions(-) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 24118c60b062..8352ee8662aa 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -54,11 +54,6 @@ struct tb_ctl { /* utility functions */ -static u64 get_route(struct tb_cfg_header header) -{ - return (u64) header.route_hi << 32 | header.route_lo; -} - static struct tb_cfg_header make_header(u64 route) { struct tb_cfg_header header = { @@ -66,7 +61,7 @@ static struct tb_cfg_header make_header(u64 route) .route_lo = route, }; /* check for overflow, route_hi is not 32 bits! */ - WARN_ON(get_route(header) != route); + WARN_ON(tb_cfg_get_route(&header) != route); return header; } @@ -91,9 +86,9 @@ static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, if (WARN(header->unknown != 1 << 9, "header->unknown is %#x\n", header->unknown)) return -EIO; - if (WARN(route != get_route(*header), + if (WARN(route != tb_cfg_get_route(header), "wrong route (expected %llx, got %llx)", - route, get_route(*header))) + route, tb_cfg_get_route(header))) return -EIO; return 0; } @@ -126,10 +121,10 @@ static struct tb_cfg_result decode_error(struct ctl_pkg *response) { struct cfg_error_pkg *pkg = response->buffer; struct tb_cfg_result res = { 0 }; - res.response_route = get_route(pkg->header); + res.response_route = tb_cfg_get_route(&pkg->header); res.response_port = 0; res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR, - get_route(pkg->header)); + tb_cfg_get_route(&pkg->header)); if (res.err) return res; @@ -153,7 +148,7 @@ static struct tb_cfg_result parse_header(struct ctl_pkg *pkg, u32 len, return decode_error(pkg); res.response_port = 0; /* will be updated later for cfg_read/write */ - res.response_route = get_route(*header); + res.response_route = tb_cfg_get_route(header); res.err = check_header(pkg, len, type, route); return res; } @@ -294,7 +289,7 @@ static void tb_ctl_handle_plug_event(struct tb_ctl *ctl, struct ctl_pkg *response) { struct cfg_event_pkg *pkg = response->buffer; - u64 route = get_route(pkg->header); + u64 route = tb_cfg_get_route(&pkg->header); if (check_header(response, sizeof(*pkg), TB_CFG_PKG_EVENT, route)) { tb_ctl_warn(ctl, "malformed TB_CFG_PKG_EVENT\n"); diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h index 610980e3232f..9812b1c86d4f 100644 --- a/drivers/thunderbolt/ctl.h +++ b/drivers/thunderbolt/ctl.h @@ -38,6 +38,10 @@ struct tb_cfg_result { enum tb_cfg_error tb_error; /* valid if err == 1 */ }; +static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header) +{ + return (u64) header->route_hi << 32 | header->route_lo; +} int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port, enum tb_cfg_error error); -- cgit v1.2.3 From 05c242e9e47d210ed6cbef31f2c441fa6ee325c6 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:08 +0300 Subject: thunderbolt: Expose make_header() to other files We will be using this function in files introduced in subsequent patches. While there the function is renamed to tb_cfg_make_header() following tb_cfg_get_route(). Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 19 ++++--------------- drivers/thunderbolt/ctl.h | 11 +++++++++++ 2 files changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 8352ee8662aa..c6633da582b8 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -54,17 +54,6 @@ struct tb_ctl { /* utility functions */ -static struct tb_cfg_header make_header(u64 route) -{ - struct tb_cfg_header header = { - .route_hi = route >> 32, - .route_lo = route, - }; - /* check for overflow, route_hi is not 32 bits! */ - WARN_ON(tb_cfg_get_route(&header) != route); - return header; -} - static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, u64 route) { @@ -501,7 +490,7 @@ int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port, enum tb_cfg_error error) { struct cfg_error_pkg pkg = { - .header = make_header(route), + .header = tb_cfg_make_header(route), .port = port, .error = error, }; @@ -520,7 +509,7 @@ struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route, int timeout_msec) { int err; - struct cfg_reset_pkg request = { .header = make_header(route) }; + struct cfg_reset_pkg request = { .header = tb_cfg_make_header(route) }; struct tb_cfg_header reply; err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_RESET); @@ -542,7 +531,7 @@ struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, { struct tb_cfg_result res = { 0 }; struct cfg_read_pkg request = { - .header = make_header(route), + .header = tb_cfg_make_header(route), .addr = { .port = port, .space = space, @@ -579,7 +568,7 @@ struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, { struct tb_cfg_result res = { 0 }; struct cfg_write_pkg request = { - .header = make_header(route), + .header = tb_cfg_make_header(route), .addr = { .port = port, .space = space, diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h index 9812b1c86d4f..914da86ec77d 100644 --- a/drivers/thunderbolt/ctl.h +++ b/drivers/thunderbolt/ctl.h @@ -43,6 +43,17 @@ static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header) return (u64) header->route_hi << 32 | header->route_lo; } +static inline struct tb_cfg_header tb_cfg_make_header(u64 route) +{ + struct tb_cfg_header header = { + .route_hi = route >> 32, + .route_lo = route, + }; + /* check for overflow, route_hi is not 32 bits! */ + WARN_ON(tb_cfg_get_route(&header) != route); + return header; +} + int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port, enum tb_cfg_error error); struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route, -- cgit v1.2.3 From 81a54b5e1986d02da33c59133556ce9fe2032049 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:09 +0300 Subject: thunderbolt: Let the connection manager handle all notifications Currently the control channel (ctl.c) handles the one supported notification (PLUG_EVENT) and sends back ACK accordingly. However, we are going to add support for the internal connection manager (ICM) that needs to handle a different notifications. So instead of dealing everything in the control channel, we change the callback to take an arbitrary thunderbolt packet and convert the native connection manager to handle the event itself. In addition we only push replies we know of to the response FIFO. Everything else is treated as notification (or request) and is expected to be dealt by the connection manager implementation. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 86 ++++++++++++++++++++++++++++++-------------- drivers/thunderbolt/ctl.h | 5 +-- drivers/thunderbolt/domain.c | 15 +++++++- drivers/thunderbolt/tb.c | 30 ++++++++++++---- drivers/thunderbolt/tb.h | 5 +-- 5 files changed, 103 insertions(+), 38 deletions(-) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index c6633da582b8..5417ed244edc 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -35,7 +35,7 @@ struct tb_ctl { DECLARE_KFIFO(response_fifo, struct ctl_pkg*, 16); struct completion response_ready; - hotplug_cb callback; + event_cb callback; void *callback_data; }; @@ -52,6 +52,9 @@ struct tb_ctl { #define tb_ctl_info(ctl, format, arg...) \ dev_info(&(ctl)->nhi->pdev->dev, format, ## arg) +#define tb_ctl_dbg(ctl, format, arg...) \ + dev_dbg(&(ctl)->nhi->pdev->dev, format, ## arg) + /* utility functions */ static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, @@ -272,24 +275,12 @@ static int tb_ctl_tx(struct tb_ctl *ctl, const void *data, size_t len, } /** - * tb_ctl_handle_plug_event() - acknowledge a plug event, invoke ctl->callback + * tb_ctl_handle_event() - acknowledge a plug event, invoke ctl->callback */ -static void tb_ctl_handle_plug_event(struct tb_ctl *ctl, - struct ctl_pkg *response) +static void tb_ctl_handle_event(struct tb_ctl *ctl, enum tb_cfg_pkg_type type, + struct ctl_pkg *pkg, size_t size) { - struct cfg_event_pkg *pkg = response->buffer; - u64 route = tb_cfg_get_route(&pkg->header); - - if (check_header(response, sizeof(*pkg), TB_CFG_PKG_EVENT, route)) { - tb_ctl_warn(ctl, "malformed TB_CFG_PKG_EVENT\n"); - return; - } - - if (tb_cfg_error(ctl, route, pkg->port, TB_CFG_ERROR_ACK_PLUG_EVENT)) - tb_ctl_warn(ctl, "could not ack plug event on %llx:%x\n", - route, pkg->port); - WARN(pkg->zero, "pkg->zero is %#x\n", pkg->zero); - ctl->callback(ctl->callback_data, route, pkg->port, pkg->unplug); + ctl->callback(ctl->callback_data, type, pkg->buffer, size); } static void tb_ctl_rx_submit(struct ctl_pkg *pkg) @@ -302,10 +293,29 @@ static void tb_ctl_rx_submit(struct ctl_pkg *pkg) */ } +static int tb_async_error(const struct ctl_pkg *pkg) +{ + const struct cfg_error_pkg *error = (const struct cfg_error_pkg *)pkg; + + if (pkg->frame.eof != TB_CFG_PKG_ERROR) + return false; + + switch (error->error) { + case TB_CFG_ERROR_LINK_ERROR: + case TB_CFG_ERROR_HEC_ERROR_DETECTED: + case TB_CFG_ERROR_FLOW_CONTROL_ERROR: + return true; + + default: + return false; + } +} + static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, bool canceled) { struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); + __be32 crc32; if (canceled) return; /* @@ -320,18 +330,42 @@ static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, } frame->size -= 4; /* remove checksum */ - if (*(__be32 *) (pkg->buffer + frame->size) - != tb_crc(pkg->buffer, frame->size)) { - tb_ctl_err(pkg->ctl, - "RX: checksum mismatch, dropping packet\n"); - goto rx; - } + crc32 = tb_crc(pkg->buffer, frame->size); be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4); - if (frame->eof == TB_CFG_PKG_EVENT) { - tb_ctl_handle_plug_event(pkg->ctl, pkg); + switch (frame->eof) { + case TB_CFG_PKG_READ: + case TB_CFG_PKG_WRITE: + case TB_CFG_PKG_ERROR: + case TB_CFG_PKG_OVERRIDE: + case TB_CFG_PKG_RESET: + if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { + tb_ctl_err(pkg->ctl, + "RX: checksum mismatch, dropping packet\n"); + goto rx; + } + if (tb_async_error(pkg)) { + tb_ctl_handle_event(pkg->ctl, frame->eof, + pkg, frame->size); + goto rx; + } + break; + + case TB_CFG_PKG_EVENT: + if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { + tb_ctl_err(pkg->ctl, + "RX: checksum mismatch, dropping packet\n"); + goto rx; + } + tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size); + goto rx; + + default: + tb_ctl_dbg(pkg->ctl, "RX: unknown package %#x, dropping\n", + frame->eof); goto rx; } + if (!kfifo_put(&pkg->ctl->response_fifo, pkg)) { tb_ctl_err(pkg->ctl, "RX: fifo is full\n"); goto rx; @@ -379,7 +413,7 @@ static struct tb_cfg_result tb_ctl_rx(struct tb_ctl *ctl, void *buffer, * * Return: Returns a pointer on success or NULL on failure. */ -struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data) +struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data) { int i; struct tb_ctl *ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h index 914da86ec77d..2b23e030a85b 100644 --- a/drivers/thunderbolt/ctl.h +++ b/drivers/thunderbolt/ctl.h @@ -13,9 +13,10 @@ /* control channel */ struct tb_ctl; -typedef void (*hotplug_cb)(void *data, u64 route, u8 port, bool unplug); +typedef void (*event_cb)(void *data, enum tb_cfg_pkg_type type, + const void *buf, size_t size); -struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data); +struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data); void tb_ctl_start(struct tb_ctl *ctl); void tb_ctl_stop(struct tb_ctl *ctl); void tb_ctl_free(struct tb_ctl *ctl); diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c index 3302f4c59638..54bc15f9bf6b 100644 --- a/drivers/thunderbolt/domain.c +++ b/drivers/thunderbolt/domain.c @@ -95,6 +95,19 @@ err_free: return NULL; } +static void tb_domain_event_cb(void *data, enum tb_cfg_pkg_type type, + const void *buf, size_t size) +{ + struct tb *tb = data; + + if (!tb->cm_ops->handle_event) { + tb_warn(tb, "domain does not have event handler\n"); + return; + } + + tb->cm_ops->handle_event(tb, type, buf, size); +} + /** * tb_domain_add() - Add domain to the system * @tb: Domain to add @@ -115,7 +128,7 @@ int tb_domain_add(struct tb *tb) mutex_lock(&tb->lock); - tb->ctl = tb_ctl_alloc(tb->nhi, tb->cm_ops->hotplug, tb); + tb->ctl = tb_ctl_alloc(tb->nhi, tb_domain_event_cb, tb); if (!tb->ctl) { ret = -ENOMEM; goto err_unlock; diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 94ecac012428..ea9de49b5e10 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -311,18 +311,34 @@ out: * * Delegates to tb_handle_hotplug. */ -static void tb_schedule_hotplug_handler(void *data, u64 route, u8 port, - bool unplug) +static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, + const void *buf, size_t size) { - struct tb *tb = data; - struct tb_hotplug_event *ev = kmalloc(sizeof(*ev), GFP_KERNEL); + const struct cfg_event_pkg *pkg = buf; + struct tb_hotplug_event *ev; + u64 route; + + if (type != TB_CFG_PKG_EVENT) { + tb_warn(tb, "unexpected event %#x, ignoring\n", type); + return; + } + + route = tb_cfg_get_route(&pkg->header); + + if (tb_cfg_error(tb->ctl, route, pkg->port, + TB_CFG_ERROR_ACK_PLUG_EVENT)) { + tb_warn(tb, "could not ack plug event on %llx:%x\n", route, + pkg->port); + } + + ev = kmalloc(sizeof(*ev), GFP_KERNEL); if (!ev) return; INIT_WORK(&ev->work, tb_handle_hotplug); ev->tb = tb; ev->route = route; - ev->port = port; - ev->unplug = unplug; + ev->port = pkg->port; + ev->unplug = pkg->unplug; queue_work(tb->wq, &ev->work); } @@ -419,7 +435,7 @@ static const struct tb_cm_ops tb_cm_ops = { .stop = tb_stop, .suspend_noirq = tb_suspend_noirq, .resume_noirq = tb_resume_noirq, - .hotplug = tb_schedule_hotplug_handler, + .handle_event = tb_handle_event, }; struct tb *tb_probe(struct tb_nhi *nhi) diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 6d4910ef2eb9..5bb9a5d60d2c 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -118,14 +118,15 @@ struct tb_path { * @stop: Stops the domain * @suspend_noirq: Connection manager specific suspend_noirq * @resume_noirq: Connection manager specific resume_noirq - * @hotplug: Handle hotplug event + * @handle_event: Handle thunderbolt event */ struct tb_cm_ops { int (*start)(struct tb *tb); void (*stop)(struct tb *tb); int (*suspend_noirq)(struct tb *tb); int (*resume_noirq)(struct tb *tb); - hotplug_cb hotplug; + void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type, + const void *buf, size_t size); }; /** -- cgit v1.2.3 From d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:10 +0300 Subject: thunderbolt: Rework control channel to be more reliable If a request times out the response might arrive right after the request is failed. This response is pushed to the kfifo and next request will read it instead. Since it most likely will not pass our validation checks in parse_header() the next request will fail as well, and response to that request will be pushed to the kfifo, ad infinitum. We end up in a situation where all requests fail and no devices can be added anymore until the driver is unloaded and reloaded again. To overcome this, rework the control channel so that we will have a queue of outstanding requests. Each request will be handled in turn and the response is validated against what is expected. Unexpected packets (for example responses for requests that have been timed out) are dropped. This model is copied from Greybus implementation with small changes here and there to get it cope with Thunderbolt control packets. In addition the configuration packets support sequence number which the switch is supposed to copy from the request to response. We use this to drop responses that are already timed out. Taking advantage of the sequence number, we automatically retry configuration read/write 4 times before giving up. Also timeout is not a programming error so there is no need to trigger a scary backtrace (WARN), instead we just log a warning. After all Thunderbolt devices are hot-pluggable by definition which means user can unplug a device any time and that is totally acceptable. With this change there is no need to take the global domain lock when sending configuration packets anymore. This is useful when we add support for cross-domain (XDomain) communication later on. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 477 +++++++++++++++++++++++++++++++++++++++------- drivers/thunderbolt/ctl.h | 65 +++++++ drivers/thunderbolt/tb.h | 2 +- 3 files changed, 473 insertions(+), 71 deletions(-) diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 5417ed244edc..27c30ff79a84 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -5,22 +5,17 @@ */ #include +#include #include #include #include #include -#include #include "ctl.h" -struct ctl_pkg { - struct tb_ctl *ctl; - void *buffer; - struct ring_frame frame; -}; - -#define TB_CTL_RX_PKG_COUNT 10 +#define TB_CTL_RX_PKG_COUNT 10 +#define TB_CTL_RETRIES 4 /** * struct tb_cfg - thunderbolt control channel @@ -32,8 +27,9 @@ struct tb_ctl { struct dma_pool *frame_pool; struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT]; - DECLARE_KFIFO(response_fifo, struct ctl_pkg*, 16); - struct completion response_ready; + struct mutex request_queue_lock; + struct list_head request_queue; + bool running; event_cb callback; void *callback_data; @@ -55,10 +51,121 @@ struct tb_ctl { #define tb_ctl_dbg(ctl, format, arg...) \ dev_dbg(&(ctl)->nhi->pdev->dev, format, ## arg) +static DECLARE_WAIT_QUEUE_HEAD(tb_cfg_request_cancel_queue); +/* Serializes access to request kref_get/put */ +static DEFINE_MUTEX(tb_cfg_request_lock); + +/** + * tb_cfg_request_alloc() - Allocates a new config request + * + * This is refcounted object so when you are done with this, call + * tb_cfg_request_put() to it. + */ +struct tb_cfg_request *tb_cfg_request_alloc(void) +{ + struct tb_cfg_request *req; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + if (!req) + return NULL; + + kref_init(&req->kref); + + return req; +} + +/** + * tb_cfg_request_get() - Increase refcount of a request + * @req: Request whose refcount is increased + */ +void tb_cfg_request_get(struct tb_cfg_request *req) +{ + mutex_lock(&tb_cfg_request_lock); + kref_get(&req->kref); + mutex_unlock(&tb_cfg_request_lock); +} + +static void tb_cfg_request_destroy(struct kref *kref) +{ + struct tb_cfg_request *req = container_of(kref, typeof(*req), kref); + + kfree(req); +} + +/** + * tb_cfg_request_put() - Decrease refcount and possibly release the request + * @req: Request whose refcount is decreased + * + * Call this function when you are done with the request. When refcount + * goes to %0 the object is released. + */ +void tb_cfg_request_put(struct tb_cfg_request *req) +{ + mutex_lock(&tb_cfg_request_lock); + kref_put(&req->kref, tb_cfg_request_destroy); + mutex_unlock(&tb_cfg_request_lock); +} + +static int tb_cfg_request_enqueue(struct tb_ctl *ctl, + struct tb_cfg_request *req) +{ + WARN_ON(test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags)); + WARN_ON(req->ctl); + + mutex_lock(&ctl->request_queue_lock); + if (!ctl->running) { + mutex_unlock(&ctl->request_queue_lock); + return -ENOTCONN; + } + req->ctl = ctl; + list_add_tail(&req->list, &ctl->request_queue); + set_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); + mutex_unlock(&ctl->request_queue_lock); + return 0; +} + +static void tb_cfg_request_dequeue(struct tb_cfg_request *req) +{ + struct tb_ctl *ctl = req->ctl; + + mutex_lock(&ctl->request_queue_lock); + list_del(&req->list); + clear_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); + if (test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) + wake_up(&tb_cfg_request_cancel_queue); + mutex_unlock(&ctl->request_queue_lock); +} + +static bool tb_cfg_request_is_active(struct tb_cfg_request *req) +{ + return test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); +} + +static struct tb_cfg_request * +tb_cfg_request_find(struct tb_ctl *ctl, struct ctl_pkg *pkg) +{ + struct tb_cfg_request *req; + bool found = false; + + mutex_lock(&pkg->ctl->request_queue_lock); + list_for_each_entry(req, &pkg->ctl->request_queue, list) { + tb_cfg_request_get(req); + if (req->match(req, pkg)) { + found = true; + break; + } + tb_cfg_request_put(req); + } + mutex_unlock(&pkg->ctl->request_queue_lock); + + return found ? req : NULL; +} + /* utility functions */ -static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, - u64 route) + +static int check_header(const struct ctl_pkg *pkg, u32 len, + enum tb_cfg_pkg_type type, u64 route) { struct tb_cfg_header *header = pkg->buffer; @@ -100,8 +207,6 @@ static int check_config_address(struct tb_cfg_address addr, if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)", length, addr.length)) return -EIO; - if (WARN(addr.seq, "addr.seq is %#x\n", addr.seq)) - return -EIO; /* * We cannot check addr->port as it is set to the upstream port of the * sender. @@ -109,7 +214,7 @@ static int check_config_address(struct tb_cfg_address addr, return 0; } -static struct tb_cfg_result decode_error(struct ctl_pkg *response) +static struct tb_cfg_result decode_error(const struct ctl_pkg *response) { struct cfg_error_pkg *pkg = response->buffer; struct tb_cfg_result res = { 0 }; @@ -130,7 +235,7 @@ static struct tb_cfg_result decode_error(struct ctl_pkg *response) } -static struct tb_cfg_result parse_header(struct ctl_pkg *pkg, u32 len, +static struct tb_cfg_result parse_header(const struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type, u64 route) { struct tb_cfg_header *header = pkg->buffer; @@ -198,7 +303,7 @@ static void be32_to_cpu_array(u32 *dst, __be32 *src, size_t len) dst[i] = be32_to_cpu(src[i]); } -static __be32 tb_crc(void *data, size_t len) +static __be32 tb_crc(const void *data, size_t len) { return cpu_to_be32(~__crc32c_le(~0, data, len)); } @@ -315,6 +420,7 @@ static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, bool canceled) { struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); + struct tb_cfg_request *req; __be32 crc32; if (canceled) @@ -361,48 +467,135 @@ static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, goto rx; default: - tb_ctl_dbg(pkg->ctl, "RX: unknown package %#x, dropping\n", - frame->eof); - goto rx; + break; } - if (!kfifo_put(&pkg->ctl->response_fifo, pkg)) { - tb_ctl_err(pkg->ctl, "RX: fifo is full\n"); - goto rx; + /* + * The received packet will be processed only if there is an + * active request and that the packet is what is expected. This + * prevents packets such as replies coming after timeout has + * triggered from messing with the active requests. + */ + req = tb_cfg_request_find(pkg->ctl, pkg); + if (req) { + if (req->copy(req, pkg)) + schedule_work(&req->work); + tb_cfg_request_put(req); } - complete(&pkg->ctl->response_ready); - return; + rx: tb_ctl_rx_submit(pkg); } +static void tb_cfg_request_work(struct work_struct *work) +{ + struct tb_cfg_request *req = container_of(work, typeof(*req), work); + + if (!test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) + req->callback(req->callback_data); + + tb_cfg_request_dequeue(req); + tb_cfg_request_put(req); +} + /** - * tb_ctl_rx() - receive a packet from the control channel + * tb_cfg_request() - Start control request not waiting for it to complete + * @ctl: Control channel to use + * @req: Request to start + * @callback: Callback called when the request is completed + * @callback_data: Data to be passed to @callback + * + * This queues @req on the given control channel without waiting for it + * to complete. When the request completes @callback is called. */ -static struct tb_cfg_result tb_ctl_rx(struct tb_ctl *ctl, void *buffer, - size_t length, int timeout_msec, - u64 route, enum tb_cfg_pkg_type type) +int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req, + void (*callback)(void *), void *callback_data) { - struct tb_cfg_result res; - struct ctl_pkg *pkg; + int ret; - if (!wait_for_completion_timeout(&ctl->response_ready, - msecs_to_jiffies(timeout_msec))) { - tb_ctl_WARN(ctl, "RX: timeout\n"); - return (struct tb_cfg_result) { .err = -ETIMEDOUT }; - } - if (!kfifo_get(&ctl->response_fifo, &pkg)) { - tb_ctl_WARN(ctl, "empty kfifo\n"); - return (struct tb_cfg_result) { .err = -EIO }; - } + req->flags = 0; + req->callback = callback; + req->callback_data = callback_data; + INIT_WORK(&req->work, tb_cfg_request_work); + INIT_LIST_HEAD(&req->list); - res = parse_header(pkg, length, type, route); - if (!res.err) - memcpy(buffer, pkg->buffer, length); - tb_ctl_rx_submit(pkg); - return res; + tb_cfg_request_get(req); + ret = tb_cfg_request_enqueue(ctl, req); + if (ret) + goto err_put; + + ret = tb_ctl_tx(ctl, req->request, req->request_size, + req->request_type); + if (ret) + goto err_dequeue; + + if (!req->response) + schedule_work(&req->work); + + return 0; + +err_dequeue: + tb_cfg_request_dequeue(req); +err_put: + tb_cfg_request_put(req); + + return ret; +} + +/** + * tb_cfg_request_cancel() - Cancel a control request + * @req: Request to cancel + * @err: Error to assign to the request + * + * This function can be used to cancel ongoing request. It will wait + * until the request is not active anymore. + */ +void tb_cfg_request_cancel(struct tb_cfg_request *req, int err) +{ + set_bit(TB_CFG_REQUEST_CANCELED, &req->flags); + schedule_work(&req->work); + wait_event(tb_cfg_request_cancel_queue, !tb_cfg_request_is_active(req)); + req->result.err = err; } +static void tb_cfg_request_complete(void *data) +{ + complete(data); +} + +/** + * tb_cfg_request_sync() - Start control request and wait until it completes + * @ctl: Control channel to use + * @req: Request to start + * @timeout_msec: Timeout how long to wait @req to complete + * + * Starts a control request and waits until it completes. If timeout + * triggers the request is canceled before function returns. Note the + * caller needs to make sure only one message for given switch is active + * at a time. + */ +struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl, + struct tb_cfg_request *req, + int timeout_msec) +{ + unsigned long timeout = msecs_to_jiffies(timeout_msec); + struct tb_cfg_result res = { 0 }; + DECLARE_COMPLETION_ONSTACK(done); + int ret; + + ret = tb_cfg_request(ctl, req, tb_cfg_request_complete, &done); + if (ret) { + res.err = ret; + return res; + } + + if (!wait_for_completion_timeout(&done, timeout)) + tb_cfg_request_cancel(req, -ETIMEDOUT); + + flush_work(&req->work); + + return req->result; +} /* public interface, alloc/start/stop/free */ @@ -423,8 +616,8 @@ struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data) ctl->callback = cb; ctl->callback_data = cb_data; - init_completion(&ctl->response_ready); - INIT_KFIFO(ctl->response_fifo); + mutex_init(&ctl->request_queue_lock); + INIT_LIST_HEAD(&ctl->request_queue); ctl->frame_pool = dma_pool_create("thunderbolt_ctl", &nhi->pdev->dev, TB_FRAME_SIZE, 4, 0); if (!ctl->frame_pool) @@ -492,6 +685,8 @@ void tb_ctl_start(struct tb_ctl *ctl) ring_start(ctl->rx); for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) tb_ctl_rx_submit(ctl->rx_packets[i]); + + ctl->running = true; } /** @@ -504,12 +699,16 @@ void tb_ctl_start(struct tb_ctl *ctl) */ void tb_ctl_stop(struct tb_ctl *ctl) { + mutex_lock(&ctl->request_queue_lock); + ctl->running = false; + mutex_unlock(&ctl->request_queue_lock); + ring_stop(ctl->rx); ring_stop(ctl->tx); - if (!kfifo_is_empty(&ctl->response_fifo)) - tb_ctl_WARN(ctl, "dangling response in response_fifo\n"); - kfifo_reset(&ctl->response_fifo); + if (!list_empty(&ctl->request_queue)) + tb_ctl_WARN(ctl, "dangling request in request_queue\n"); + INIT_LIST_HEAD(&ctl->request_queue); tb_ctl_info(ctl, "control channel stopped\n"); } @@ -532,6 +731,49 @@ int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port, return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR); } +static bool tb_cfg_match(const struct tb_cfg_request *req, + const struct ctl_pkg *pkg) +{ + u64 route = tb_cfg_get_route(pkg->buffer) & ~BIT_ULL(63); + + if (pkg->frame.eof == TB_CFG_PKG_ERROR) + return true; + + if (pkg->frame.eof != req->response_type) + return false; + if (route != tb_cfg_get_route(req->request)) + return false; + if (pkg->frame.size != req->response_size) + return false; + + if (pkg->frame.eof == TB_CFG_PKG_READ || + pkg->frame.eof == TB_CFG_PKG_WRITE) { + const struct cfg_read_pkg *req_hdr = req->request; + const struct cfg_read_pkg *res_hdr = pkg->buffer; + + if (req_hdr->addr.seq != res_hdr->addr.seq) + return false; + } + + return true; +} + +static bool tb_cfg_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg) +{ + struct tb_cfg_result res; + + /* Now make sure it is in expected format */ + res = parse_header(pkg, req->response_size, req->response_type, + tb_cfg_get_route(req->request)); + if (!res.err) + memcpy(req->response, pkg->buffer, req->response_size); + + req->result = res; + + /* Always complete when first response is received */ + return true; +} + /** * tb_cfg_reset() - send a reset packet and wait for a response * @@ -542,16 +784,31 @@ int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port, struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route, int timeout_msec) { - int err; struct cfg_reset_pkg request = { .header = tb_cfg_make_header(route) }; + struct tb_cfg_result res = { 0 }; struct tb_cfg_header reply; + struct tb_cfg_request *req; + + req = tb_cfg_request_alloc(); + if (!req) { + res.err = -ENOMEM; + return res; + } + + req->match = tb_cfg_match; + req->copy = tb_cfg_copy; + req->request = &request; + req->request_size = sizeof(request); + req->request_type = TB_CFG_PKG_RESET; + req->response = &reply; + req->response_size = sizeof(reply); + req->response_type = sizeof(TB_CFG_PKG_RESET); + + res = tb_cfg_request_sync(ctl, req, timeout_msec); - err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_RESET); - if (err) - return (struct tb_cfg_result) { .err = err }; + tb_cfg_request_put(req); - return tb_ctl_rx(ctl, &reply, sizeof(reply), timeout_msec, route, - TB_CFG_PKG_RESET); + return res; } /** @@ -574,13 +831,39 @@ struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, }, }; struct cfg_write_pkg reply; + int retries = 0; - res.err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_READ); - if (res.err) - return res; + while (retries < TB_CTL_RETRIES) { + struct tb_cfg_request *req; + + req = tb_cfg_request_alloc(); + if (!req) { + res.err = -ENOMEM; + return res; + } + + request.addr.seq = retries++; + + req->match = tb_cfg_match; + req->copy = tb_cfg_copy; + req->request = &request; + req->request_size = sizeof(request); + req->request_type = TB_CFG_PKG_READ; + req->response = &reply; + req->response_size = 12 + 4 * length; + req->response_type = TB_CFG_PKG_READ; + + res = tb_cfg_request_sync(ctl, req, timeout_msec); + + tb_cfg_request_put(req); + + if (res.err != -ETIMEDOUT) + break; + + /* Wait a bit (arbitrary time) until we send a retry */ + usleep_range(10, 100); + } - res = tb_ctl_rx(ctl, &reply, 12 + 4 * length, timeout_msec, route, - TB_CFG_PKG_READ); if (res.err) return res; @@ -611,15 +894,41 @@ struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, }, }; struct cfg_read_pkg reply; + int retries = 0; memcpy(&request.data, buffer, length * 4); - res.err = tb_ctl_tx(ctl, &request, 12 + 4 * length, TB_CFG_PKG_WRITE); - if (res.err) - return res; + while (retries < TB_CTL_RETRIES) { + struct tb_cfg_request *req; + + req = tb_cfg_request_alloc(); + if (!req) { + res.err = -ENOMEM; + return res; + } + + request.addr.seq = retries++; + + req->match = tb_cfg_match; + req->copy = tb_cfg_copy; + req->request = &request; + req->request_size = 12 + 4 * length; + req->request_type = TB_CFG_PKG_WRITE; + req->response = &reply; + req->response_size = sizeof(reply); + req->response_type = TB_CFG_PKG_WRITE; + + res = tb_cfg_request_sync(ctl, req, timeout_msec); + + tb_cfg_request_put(req); + + if (res.err != -ETIMEDOUT) + break; + + /* Wait a bit (arbitrary time) until we send a retry */ + usleep_range(10, 100); + } - res = tb_ctl_rx(ctl, &reply, sizeof(reply), timeout_msec, route, - TB_CFG_PKG_WRITE); if (res.err) return res; @@ -633,11 +942,25 @@ int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, { struct tb_cfg_result res = tb_cfg_read_raw(ctl, buffer, route, port, space, offset, length, TB_CFG_DEFAULT_TIMEOUT); - if (res.err == 1) { + switch (res.err) { + case 0: + /* Success */ + break; + + case 1: + /* Thunderbolt error, tb_error holds the actual number */ tb_cfg_print_error(ctl, &res); return -EIO; + + case -ETIMEDOUT: + tb_ctl_warn(ctl, "timeout reading config space %u from %#x\n", + space, offset); + break; + + default: + WARN(1, "tb_cfg_read: %d\n", res.err); + break; } - WARN(res.err, "tb_cfg_read: %d\n", res.err); return res.err; } @@ -646,11 +969,25 @@ int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, { struct tb_cfg_result res = tb_cfg_write_raw(ctl, buffer, route, port, space, offset, length, TB_CFG_DEFAULT_TIMEOUT); - if (res.err == 1) { + switch (res.err) { + case 0: + /* Success */ + break; + + case 1: + /* Thunderbolt error, tb_error holds the actual number */ tb_cfg_print_error(ctl, &res); return -EIO; + + case -ETIMEDOUT: + tb_ctl_warn(ctl, "timeout writing config space %u to %#x\n", + space, offset); + break; + + default: + WARN(1, "tb_cfg_write: %d\n", res.err); + break; } - WARN(res.err, "tb_cfg_write: %d\n", res.err); return res.err; } diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h index 2b23e030a85b..36fd28b1c1c5 100644 --- a/drivers/thunderbolt/ctl.h +++ b/drivers/thunderbolt/ctl.h @@ -7,6 +7,8 @@ #ifndef _TB_CFG #define _TB_CFG +#include + #include "nhi.h" #include "tb_msgs.h" @@ -39,6 +41,69 @@ struct tb_cfg_result { enum tb_cfg_error tb_error; /* valid if err == 1 */ }; +struct ctl_pkg { + struct tb_ctl *ctl; + void *buffer; + struct ring_frame frame; +}; + +/** + * struct tb_cfg_request - Control channel request + * @kref: Reference count + * @ctl: Pointer to the control channel structure. Only set when the + * request is queued. + * @request_size: Size of the request packet (in bytes) + * @request_type: Type of the request packet + * @response: Response is stored here + * @response_size: Maximum size of one response packet + * @response_type: Expected type of the response packet + * @npackets: Number of packets expected to be returned with this request + * @match: Function used to match the incoming packet + * @copy: Function used to copy the incoming packet to @response + * @callback: Callback called when the request is finished successfully + * @callback_data: Data to be passed to @callback + * @flags: Flags for the request + * @work: Work item used to complete the request + * @result: Result after the request has been completed + * @list: Requests are queued using this field + * + * An arbitrary request over Thunderbolt control channel. For standard + * control channel message, one should use tb_cfg_read/write() and + * friends if possible. + */ +struct tb_cfg_request { + struct kref kref; + struct tb_ctl *ctl; + const void *request; + size_t request_size; + enum tb_cfg_pkg_type request_type; + void *response; + size_t response_size; + enum tb_cfg_pkg_type response_type; + size_t npackets; + bool (*match)(const struct tb_cfg_request *req, + const struct ctl_pkg *pkg); + bool (*copy)(struct tb_cfg_request *req, const struct ctl_pkg *pkg); + void (*callback)(void *callback_data); + void *callback_data; + unsigned long flags; + struct work_struct work; + struct tb_cfg_result result; + struct list_head list; +}; + +#define TB_CFG_REQUEST_ACTIVE 0 +#define TB_CFG_REQUEST_CANCELED 1 + +struct tb_cfg_request *tb_cfg_request_alloc(void); +void tb_cfg_request_get(struct tb_cfg_request *req); +void tb_cfg_request_put(struct tb_cfg_request *req); +int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req, + void (*callback)(void *), void *callback_data); +void tb_cfg_request_cancel(struct tb_cfg_request *req, int err); +struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl, + struct tb_cfg_request *req, int timeout_msec); + static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header) { return (u64) header->route_hi << 32 | header->route_lo; diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 5bb9a5d60d2c..98a405384596 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -132,7 +132,7 @@ struct tb_cm_ops { /** * struct tb - main thunderbolt bus structure * @dev: Domain device - * @lock: Big lock. Must be held when accessing cfg or any struct + * @lock: Big lock. Must be held when accessing any struct * tb_switch / struct tb_port. * @nhi: Pointer to the NHI structure * @ctl: Control channel for this domain -- cgit v1.2.3 From 5e2781bcb1e876d314832489ff8177ef917d9b45 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:11 +0300 Subject: thunderbolt: Add new Thunderbolt PCI IDs Add Intel Win Ridge (Thunderbolt 2) and Alpine Ridge (Thunderbolt 3) controller PCI IDs to the list of supported devices. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/nhi.c | 11 +++++++++++ drivers/thunderbolt/nhi.h | 17 +++++++++++++++++ drivers/thunderbolt/switch.c | 19 ++++++++++++++----- 3 files changed, 42 insertions(+), 5 deletions(-) diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index c1113a3c4128..fa4c2745dba2 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -787,6 +787,17 @@ static struct pci_device_id nhi_ids[] = { .device = PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI, .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, }, + + /* Thunderbolt 3 */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI) }, + { 0,} }; diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h index 630f44140530..8bd9b4e5a0b1 100644 --- a/drivers/thunderbolt/nhi.h +++ b/drivers/thunderbolt/nhi.h @@ -143,4 +143,21 @@ static inline int ring_tx(struct tb_ring *ring, struct ring_frame *frame) return __ring_enqueue(ring, frame); } +/* + * PCI IDs used in this driver from Win Ridge forward. There is no + * need for the PCI quirk anymore as we will use ICM also on Apple + * hardware. + */ +#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI 0x157d +#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE 0x157e +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI 0x15bf +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE 0x15c0 +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI 0x15d2 +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE 0x15d3 +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI 0x15d9 +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE 0x15da +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI 0x15dc +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI 0x15dd +#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI 0x15de + #endif diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 11f16a141686..1497518aceff 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -491,13 +491,22 @@ int tb_switch_configure(struct tb_switch *sw) tb_sw_warn(sw, "unknown switch vendor id %#x\n", sw->config.vendor_id); - if (sw->config.device_id != PCI_DEVICE_ID_INTEL_LIGHT_RIDGE && - sw->config.device_id != PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C && - sw->config.device_id != PCI_DEVICE_ID_INTEL_PORT_RIDGE && - sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE && - sw->config.device_id != PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE) + switch (sw->config.device_id) { + case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: + case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: + case PCI_DEVICE_ID_INTEL_PORT_RIDGE: + case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE: + break; + + default: tb_sw_warn(sw, "unsupported switch device id %#x\n", sw->config.device_id); + } sw->config.enabled = 1; -- cgit v1.2.3 From cd446ee2e64f03d0e3d8463bf826aaebe0005149 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:12 +0300 Subject: thunderbolt: Add support for NHI mailbox The host controller includes two sets of registers that are used to communicate with the firmware. Add functions that can be used to access these registers. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/nhi.c | 58 ++++++++++++++++++++++++++++++++++++++++++ drivers/thunderbolt/nhi.h | 16 ++++++++++++ drivers/thunderbolt/nhi_regs.h | 11 ++++++++ 3 files changed, 85 insertions(+) diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index fa4c2745dba2..c358c074f925 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "nhi.h" #include "nhi_regs.h" @@ -28,6 +29,8 @@ #define MSIX_MIN_VECS 6 #define MSIX_MAX_VECS 16 +#define NHI_MAILBOX_TIMEOUT 500 /* ms */ + static int ring_interrupt_index(struct tb_ring *ring) { int bit = ring->hop; @@ -525,6 +528,61 @@ void ring_free(struct tb_ring *ring) kfree(ring); } +/** + * nhi_mailbox_cmd() - Send a command through NHI mailbox + * @nhi: Pointer to the NHI structure + * @cmd: Command to send + * @data: Data to be send with the command + * + * Sends mailbox command to the firmware running on NHI. Returns %0 in + * case of success and negative errno in case of failure. + */ +int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data) +{ + ktime_t timeout; + u32 val; + + iowrite32(data, nhi->iobase + REG_INMAIL_DATA); + + val = ioread32(nhi->iobase + REG_INMAIL_CMD); + val &= ~(REG_INMAIL_CMD_MASK | REG_INMAIL_ERROR); + val |= REG_INMAIL_OP_REQUEST | cmd; + iowrite32(val, nhi->iobase + REG_INMAIL_CMD); + + timeout = ktime_add_ms(ktime_get(), NHI_MAILBOX_TIMEOUT); + do { + val = ioread32(nhi->iobase + REG_INMAIL_CMD); + if (!(val & REG_INMAIL_OP_REQUEST)) + break; + usleep_range(10, 20); + } while (ktime_before(ktime_get(), timeout)); + + if (val & REG_INMAIL_OP_REQUEST) + return -ETIMEDOUT; + if (val & REG_INMAIL_ERROR) + return -EIO; + + return 0; +} + +/** + * nhi_mailbox_mode() - Return current firmware operation mode + * @nhi: Pointer to the NHI structure + * + * The function reads current firmware operation mode using NHI mailbox + * registers and returns it to the caller. + */ +enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi) +{ + u32 val; + + val = ioread32(nhi->iobase + REG_OUTMAIL_CMD); + val &= REG_OUTMAIL_CMD_OPMODE_MASK; + val >>= REG_OUTMAIL_CMD_OPMODE_SHIFT; + + return (enum nhi_fw_mode)val; +} + static void nhi_interrupt_work(struct work_struct *work) { struct tb_nhi *nhi = container_of(work, typeof(*nhi), interrupt_work); diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h index 8bd9b4e5a0b1..446ff6dac91d 100644 --- a/drivers/thunderbolt/nhi.h +++ b/drivers/thunderbolt/nhi.h @@ -143,6 +143,22 @@ static inline int ring_tx(struct tb_ring *ring, struct ring_frame *frame) return __ring_enqueue(ring, frame); } +enum nhi_fw_mode { + NHI_FW_SAFE_MODE, + NHI_FW_AUTH_MODE, + NHI_FW_EP_MODE, + NHI_FW_CM_MODE, +}; + +enum nhi_mailbox_cmd { + NHI_MAILBOX_SAVE_DEVS = 0x05, + NHI_MAILBOX_DRV_UNLOADS = 0x07, + NHI_MAILBOX_ALLOW_ALL_DEVS = 0x23, +}; + +int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data); +enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi); + /* * PCI IDs used in this driver from Win Ridge forward. There is no * need for the PCI quirk anymore as we will use ICM also on Apple diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h index 48b98d3c7e6a..322fe1fa3a3c 100644 --- a/drivers/thunderbolt/nhi_regs.h +++ b/drivers/thunderbolt/nhi_regs.h @@ -107,4 +107,15 @@ struct ring_desc { #define REG_DMA_MISC 0x39864 #define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2) +#define REG_INMAIL_DATA 0x39900 + +#define REG_INMAIL_CMD 0x39904 +#define REG_INMAIL_CMD_MASK GENMASK(7, 0) +#define REG_INMAIL_ERROR BIT(30) +#define REG_INMAIL_OP_REQUEST BIT(31) + +#define REG_OUTMAIL_CMD 0x3990c +#define REG_OUTMAIL_CMD_OPMODE_SHIFT 8 +#define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8) + #endif -- cgit v1.2.3 From 2c3c4197c9dd878e39e249e1da64bcffceb8a5c4 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:13 +0300 Subject: thunderbolt: Store Thunderbolt generation in the switch structure In some cases it is useful to know what is the Thunderbolt generation the switch supports. This introduces a new field to struct switch that stores the generation of the switch based on the device ID. Unknown switches (there should be none) are assumed to be first generation to be on the safe side. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 55 ++++++++++++++++++++++++++++++-------------- drivers/thunderbolt/tb.h | 2 ++ 2 files changed, 40 insertions(+), 17 deletions(-) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 1497518aceff..6384061100b0 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -390,6 +390,42 @@ struct device_type tb_switch_type = { .release = tb_switch_release, }; +static int tb_switch_get_generation(struct tb_switch *sw) +{ + switch (sw->config.device_id) { + case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: + case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE: + case PCI_DEVICE_ID_INTEL_LIGHT_PEAK: + case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C: + case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: + case PCI_DEVICE_ID_INTEL_PORT_RIDGE: + case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE: + return 1; + + case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE: + return 2; + + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE: + return 3; + + default: + /* + * For unknown switches assume generation to be 1 to be + * on the safe side. + */ + tb_sw_warn(sw, "unsupported switch device id %#x\n", + sw->config.device_id); + return 1; + } +} + /** * tb_switch_alloc() - allocate a switch * @tb: Pointer to the owning domain @@ -443,6 +479,8 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, sw->ports[i].port = i; } + sw->generation = tb_switch_get_generation(sw); + cap = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS); if (cap < 0) { tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n"); @@ -491,23 +529,6 @@ int tb_switch_configure(struct tb_switch *sw) tb_sw_warn(sw, "unknown switch vendor id %#x\n", sw->config.vendor_id); - switch (sw->config.device_id) { - case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: - case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: - case PCI_DEVICE_ID_INTEL_PORT_RIDGE: - case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE: - case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE: - case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE: - case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE: - case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE: - case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE: - break; - - default: - tb_sw_warn(sw, "unsupported switch device id %#x\n", - sw->config.device_id); - } - sw->config.enabled = 1; /* upload configuration */ diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 98a405384596..39d24dff82c5 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -25,6 +25,7 @@ * @device: Device ID of the switch * @vendor_name: Name of the vendor (or %NULL if not known) * @device_name: Name of the device (or %NULL if not known) + * @generation: Switch Thunderbolt generation * @cap_plug_events: Offset to the plug events capability (%0 if not found) * @is_unplugged: The switch is going away * @drom: DROM of the switch (%NULL if not found) @@ -40,6 +41,7 @@ struct tb_switch { u16 device; const char *vendor_name; const char *device_name; + unsigned int generation; int cap_plug_events; bool is_unplugged; u8 *drom; -- cgit v1.2.3 From 3e13676862f90dbf5b00d57d5599e57788289897 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:14 +0300 Subject: thunderbolt: Add support for DMA configuration based mailbox The DMA (NHI) port of a switch provides access to the NVM of the host controller (and devices starting from Intel Alpine Ridge). The NVM contains also more complete DROM for the root switch including vendor and device identification strings. This will look for the DMA port capability for each switch and if found populates sw->dma_port. We then teach tb_drom_read() to read the DROM information from NVM if available for the root switch. The DMA port capability also supports upgrading the NVM for both host controller and devices which will be added in subsequent patches. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/Makefile | 2 +- drivers/thunderbolt/dma_port.c | 524 +++++++++++++++++++++++++++++++++++++++++ drivers/thunderbolt/dma_port.h | 34 +++ drivers/thunderbolt/eeprom.c | 51 +++- drivers/thunderbolt/switch.c | 30 +++ drivers/thunderbolt/tb.h | 5 + 6 files changed, 644 insertions(+), 2 deletions(-) create mode 100644 drivers/thunderbolt/dma_port.c create mode 100644 drivers/thunderbolt/dma_port.h diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile index e276a9a62261..9828e862dd35 100644 --- a/drivers/thunderbolt/Makefile +++ b/drivers/thunderbolt/Makefile @@ -1,3 +1,3 @@ obj-${CONFIG_THUNDERBOLT} := thunderbolt.o thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel_pci.o eeprom.o -thunderbolt-objs += domain.o +thunderbolt-objs += domain.o dma_port.o diff --git a/drivers/thunderbolt/dma_port.c b/drivers/thunderbolt/dma_port.c new file mode 100644 index 000000000000..af6dde347bee --- /dev/null +++ b/drivers/thunderbolt/dma_port.c @@ -0,0 +1,524 @@ +/* + * Thunderbolt DMA configuration based mailbox support + * + * Copyright (C) 2017, Intel Corporation + * Authors: Michael Jamet + * Mika Westerberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include + +#include "dma_port.h" +#include "tb_regs.h" + +#define DMA_PORT_CAP 0x3e + +#define MAIL_DATA 1 +#define MAIL_DATA_DWORDS 16 + +#define MAIL_IN 17 +#define MAIL_IN_CMD_SHIFT 28 +#define MAIL_IN_CMD_MASK GENMASK(31, 28) +#define MAIL_IN_CMD_FLASH_WRITE 0x0 +#define MAIL_IN_CMD_FLASH_UPDATE_AUTH 0x1 +#define MAIL_IN_CMD_FLASH_READ 0x2 +#define MAIL_IN_CMD_POWER_CYCLE 0x4 +#define MAIL_IN_DWORDS_SHIFT 24 +#define MAIL_IN_DWORDS_MASK GENMASK(27, 24) +#define MAIL_IN_ADDRESS_SHIFT 2 +#define MAIL_IN_ADDRESS_MASK GENMASK(23, 2) +#define MAIL_IN_CSS BIT(1) +#define MAIL_IN_OP_REQUEST BIT(0) + +#define MAIL_OUT 18 +#define MAIL_OUT_STATUS_RESPONSE BIT(29) +#define MAIL_OUT_STATUS_CMD_SHIFT 4 +#define MAIL_OUT_STATUS_CMD_MASK GENMASK(7, 4) +#define MAIL_OUT_STATUS_MASK GENMASK(3, 0) +#define MAIL_OUT_STATUS_COMPLETED 0 +#define MAIL_OUT_STATUS_ERR_AUTH 1 +#define MAIL_OUT_STATUS_ERR_ACCESS 2 + +#define DMA_PORT_TIMEOUT 5000 /* ms */ +#define DMA_PORT_RETRIES 3 + +/** + * struct tb_dma_port - DMA control port + * @sw: Switch the DMA port belongs to + * @port: Switch port number where DMA capability is found + * @base: Start offset of the mailbox registers + * @buf: Temporary buffer to store a single block + */ +struct tb_dma_port { + struct tb_switch *sw; + u8 port; + u32 base; + u8 *buf; +}; + +/* + * When the switch is in safe mode it supports very little functionality + * so we don't validate that much here. + */ +static bool dma_port_match(const struct tb_cfg_request *req, + const struct ctl_pkg *pkg) +{ + u64 route = tb_cfg_get_route(pkg->buffer) & ~BIT_ULL(63); + + if (pkg->frame.eof == TB_CFG_PKG_ERROR) + return true; + if (pkg->frame.eof != req->response_type) + return false; + if (route != tb_cfg_get_route(req->request)) + return false; + if (pkg->frame.size != req->response_size) + return false; + + return true; +} + +static bool dma_port_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg) +{ + memcpy(req->response, pkg->buffer, req->response_size); + return true; +} + +static int dma_port_read(struct tb_ctl *ctl, void *buffer, u64 route, + u32 port, u32 offset, u32 length, int timeout_msec) +{ + struct cfg_read_pkg request = { + .header = tb_cfg_make_header(route), + .addr = { + .seq = 1, + .port = port, + .space = TB_CFG_PORT, + .offset = offset, + .length = length, + }, + }; + struct tb_cfg_request *req; + struct cfg_write_pkg reply; + struct tb_cfg_result res; + + req = tb_cfg_request_alloc(); + if (!req) + return -ENOMEM; + + req->match = dma_port_match; + req->copy = dma_port_copy; + req->request = &request; + req->request_size = sizeof(request); + req->request_type = TB_CFG_PKG_READ; + req->response = &reply; + req->response_size = 12 + 4 * length; + req->response_type = TB_CFG_PKG_READ; + + res = tb_cfg_request_sync(ctl, req, timeout_msec); + + tb_cfg_request_put(req); + + if (res.err) + return res.err; + + memcpy(buffer, &reply.data, 4 * length); + return 0; +} + +static int dma_port_write(struct tb_ctl *ctl, const void *buffer, u64 route, + u32 port, u32 offset, u32 length, int timeout_msec) +{ + struct cfg_write_pkg request = { + .header = tb_cfg_make_header(route), + .addr = { + .seq = 1, + .port = port, + .space = TB_CFG_PORT, + .offset = offset, + .length = length, + }, + }; + struct tb_cfg_request *req; + struct cfg_read_pkg reply; + struct tb_cfg_result res; + + memcpy(&request.data, buffer, length * 4); + + req = tb_cfg_request_alloc(); + if (!req) + return -ENOMEM; + + req->match = dma_port_match; + req->copy = dma_port_copy; + req->request = &request; + req->request_size = 12 + 4 * length; + req->request_type = TB_CFG_PKG_WRITE; + req->response = &reply; + req->response_size = sizeof(reply); + req->response_type = TB_CFG_PKG_WRITE; + + res = tb_cfg_request_sync(ctl, req, timeout_msec); + + tb_cfg_request_put(req); + + return res.err; +} + +static int dma_find_port(struct tb_switch *sw) +{ + int port, ret; + u32 type; + + /* + * The DMA (NHI) port is either 3 or 5 depending on the + * controller. Try both starting from 5 which is more common. + */ + port = 5; + ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), port, 2, 1, + DMA_PORT_TIMEOUT); + if (!ret && (type & 0xffffff) == TB_TYPE_NHI) + return port; + + port = 3; + ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), port, 2, 1, + DMA_PORT_TIMEOUT); + if (!ret && (type & 0xffffff) == TB_TYPE_NHI) + return port; + + return -ENODEV; +} + +/** + * dma_port_alloc() - Finds DMA control port from a switch pointed by route + * @sw: Switch from where find the DMA port + * + * Function checks if the switch NHI port supports DMA configuration + * based mailbox capability and if it does, allocates and initializes + * DMA port structure. Returns %NULL if the capabity was not found. + * + * The DMA control port is functional also when the switch is in safe + * mode. + */ +struct tb_dma_port *dma_port_alloc(struct tb_switch *sw) +{ + struct tb_dma_port *dma; + int port; + + port = dma_find_port(sw); + if (port < 0) + return NULL; + + dma = kzalloc(sizeof(*dma), GFP_KERNEL); + if (!dma) + return NULL; + + dma->buf = kmalloc_array(MAIL_DATA_DWORDS, sizeof(u32), GFP_KERNEL); + if (!dma->buf) { + kfree(dma); + return NULL; + } + + dma->sw = sw; + dma->port = port; + dma->base = DMA_PORT_CAP; + + return dma; +} + +/** + * dma_port_free() - Release DMA control port structure + * @dma: DMA control port + */ +void dma_port_free(struct tb_dma_port *dma) +{ + if (dma) { + kfree(dma->buf); + kfree(dma); + } +} + +static int dma_port_wait_for_completion(struct tb_dma_port *dma, + unsigned int timeout) +{ + unsigned long end = jiffies + msecs_to_jiffies(timeout); + struct tb_switch *sw = dma->sw; + + do { + int ret; + u32 in; + + ret = dma_port_read(sw->tb->ctl, &in, tb_route(sw), dma->port, + dma->base + MAIL_IN, 1, 50); + if (ret) { + if (ret != -ETIMEDOUT) + return ret; + } else if (!(in & MAIL_IN_OP_REQUEST)) { + return 0; + } + + usleep_range(50, 100); + } while (time_before(jiffies, end)); + + return -ETIMEDOUT; +} + +static int status_to_errno(u32 status) +{ + switch (status & MAIL_OUT_STATUS_MASK) { + case MAIL_OUT_STATUS_COMPLETED: + return 0; + case MAIL_OUT_STATUS_ERR_AUTH: + return -EINVAL; + case MAIL_OUT_STATUS_ERR_ACCESS: + return -EACCES; + } + + return -EIO; +} + +static int dma_port_request(struct tb_dma_port *dma, u32 in, + unsigned int timeout) +{ + struct tb_switch *sw = dma->sw; + u32 out; + int ret; + + ret = dma_port_write(sw->tb->ctl, &in, tb_route(sw), dma->port, + dma->base + MAIL_IN, 1, DMA_PORT_TIMEOUT); + if (ret) + return ret; + + ret = dma_port_wait_for_completion(dma, timeout); + if (ret) + return ret; + + ret = dma_port_read(sw->tb->ctl, &out, tb_route(sw), dma->port, + dma->base + MAIL_OUT, 1, DMA_PORT_TIMEOUT); + if (ret) + return ret; + + return status_to_errno(out); +} + +static int dma_port_flash_read_block(struct tb_dma_port *dma, u32 address, + void *buf, u32 size) +{ + struct tb_switch *sw = dma->sw; + u32 in, dwaddress, dwords; + int ret; + + dwaddress = address / 4; + dwords = size / 4; + + in = MAIL_IN_CMD_FLASH_READ << MAIL_IN_CMD_SHIFT; + if (dwords < MAIL_DATA_DWORDS) + in |= (dwords << MAIL_IN_DWORDS_SHIFT) & MAIL_IN_DWORDS_MASK; + in |= (dwaddress << MAIL_IN_ADDRESS_SHIFT) & MAIL_IN_ADDRESS_MASK; + in |= MAIL_IN_OP_REQUEST; + + ret = dma_port_request(dma, in, DMA_PORT_TIMEOUT); + if (ret) + return ret; + + return dma_port_read(sw->tb->ctl, buf, tb_route(sw), dma->port, + dma->base + MAIL_DATA, dwords, DMA_PORT_TIMEOUT); +} + +static int dma_port_flash_write_block(struct tb_dma_port *dma, u32 address, + const void *buf, u32 size) +{ + struct tb_switch *sw = dma->sw; + u32 in, dwaddress, dwords; + int ret; + + dwords = size / 4; + + /* Write the block to MAIL_DATA registers */ + ret = dma_port_write(sw->tb->ctl, buf, tb_route(sw), dma->port, + dma->base + MAIL_DATA, dwords, DMA_PORT_TIMEOUT); + + in = MAIL_IN_CMD_FLASH_WRITE << MAIL_IN_CMD_SHIFT; + + /* CSS header write is always done to the same magic address */ + if (address >= DMA_PORT_CSS_ADDRESS) { + dwaddress = DMA_PORT_CSS_ADDRESS; + in |= MAIL_IN_CSS; + } else { + dwaddress = address / 4; + } + + in |= ((dwords - 1) << MAIL_IN_DWORDS_SHIFT) & MAIL_IN_DWORDS_MASK; + in |= (dwaddress << MAIL_IN_ADDRESS_SHIFT) & MAIL_IN_ADDRESS_MASK; + in |= MAIL_IN_OP_REQUEST; + + return dma_port_request(dma, in, DMA_PORT_TIMEOUT); +} + +/** + * dma_port_flash_read() - Read from active flash region + * @dma: DMA control port + * @address: Address relative to the start of active region + * @buf: Buffer where the data is read + * @size: Size of the buffer + */ +int dma_port_flash_read(struct tb_dma_port *dma, unsigned int address, + void *buf, size_t size) +{ + unsigned int retries = DMA_PORT_RETRIES; + unsigned int offset; + + offset = address & 3; + address = address & ~3; + + do { + u32 nbytes = min_t(u32, size, MAIL_DATA_DWORDS * 4); + int ret; + + ret = dma_port_flash_read_block(dma, address, dma->buf, + ALIGN(nbytes, 4)); + if (ret) { + if (ret == -ETIMEDOUT) { + if (retries--) + continue; + ret = -EIO; + } + return ret; + } + + memcpy(buf, dma->buf + offset, nbytes); + + size -= nbytes; + address += nbytes; + buf += nbytes; + } while (size > 0); + + return 0; +} + +/** + * dma_port_flash_write() - Write to non-active flash region + * @dma: DMA control port + * @address: Address relative to the start of non-active region + * @buf: Data to write + * @size: Size of the buffer + * + * Writes block of data to the non-active flash region of the switch. If + * the address is given as %DMA_PORT_CSS_ADDRESS the block is written + * using CSS command. + */ +int dma_port_flash_write(struct tb_dma_port *dma, unsigned int address, + const void *buf, size_t size) +{ + unsigned int retries = DMA_PORT_RETRIES; + unsigned int offset; + + if (address >= DMA_PORT_CSS_ADDRESS) { + offset = 0; + if (size > DMA_PORT_CSS_MAX_SIZE) + return -E2BIG; + } else { + offset = address & 3; + address = address & ~3; + } + + do { + u32 nbytes = min_t(u32, size, MAIL_DATA_DWORDS * 4); + int ret; + + memcpy(dma->buf + offset, buf, nbytes); + + ret = dma_port_flash_write_block(dma, address, buf, nbytes); + if (ret) { + if (ret == -ETIMEDOUT) { + if (retries--) + continue; + ret = -EIO; + } + return ret; + } + + size -= nbytes; + address += nbytes; + buf += nbytes; + } while (size > 0); + + return 0; +} + +/** + * dma_port_flash_update_auth() - Starts flash authenticate cycle + * @dma: DMA control port + * + * Starts the flash update authentication cycle. If the image in the + * non-active area was valid, the switch starts upgrade process where + * active and non-active area get swapped in the end. Caller should call + * dma_port_flash_update_auth_status() to get status of this command. + * This is because if the switch in question is root switch the + * thunderbolt host controller gets reset as well. + */ +int dma_port_flash_update_auth(struct tb_dma_port *dma) +{ + u32 in; + + in = MAIL_IN_CMD_FLASH_UPDATE_AUTH << MAIL_IN_CMD_SHIFT; + in |= MAIL_IN_OP_REQUEST; + + return dma_port_request(dma, in, 150); +} + +/** + * dma_port_flash_update_auth_status() - Reads status of update auth command + * @dma: DMA control port + * @status: Status code of the operation + * + * The function checks if there is status available from the last update + * auth command. Returns %0 if there is no status and no further + * action is required. If there is status, %1 is returned instead and + * @status holds the failure code. + * + * Negative return means there was an error reading status from the + * switch. + */ +int dma_port_flash_update_auth_status(struct tb_dma_port *dma, u32 *status) +{ + struct tb_switch *sw = dma->sw; + u32 out, cmd; + int ret; + + ret = dma_port_read(sw->tb->ctl, &out, tb_route(sw), dma->port, + dma->base + MAIL_OUT, 1, DMA_PORT_TIMEOUT); + if (ret) + return ret; + + /* Check if the status relates to flash update auth */ + cmd = (out & MAIL_OUT_STATUS_CMD_MASK) >> MAIL_OUT_STATUS_CMD_SHIFT; + if (cmd == MAIL_IN_CMD_FLASH_UPDATE_AUTH) { + if (status) + *status = out & MAIL_OUT_STATUS_MASK; + + /* Reset is needed in any case */ + return 1; + } + + return 0; +} + +/** + * dma_port_power_cycle() - Power cycles the switch + * @dma: DMA control port + * + * Triggers power cycle to the switch. + */ +int dma_port_power_cycle(struct tb_dma_port *dma) +{ + u32 in; + + in = MAIL_IN_CMD_POWER_CYCLE << MAIL_IN_CMD_SHIFT; + in |= MAIL_IN_OP_REQUEST; + + return dma_port_request(dma, in, 150); +} diff --git a/drivers/thunderbolt/dma_port.h b/drivers/thunderbolt/dma_port.h new file mode 100644 index 000000000000..c4a69e0fbff7 --- /dev/null +++ b/drivers/thunderbolt/dma_port.h @@ -0,0 +1,34 @@ +/* + * Thunderbolt DMA configuration based mailbox support + * + * Copyright (C) 2017, Intel Corporation + * Authors: Michael Jamet + * Mika Westerberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef DMA_PORT_H_ +#define DMA_PORT_H_ + +#include "tb.h" + +struct tb_switch; +struct tb_dma_port; + +#define DMA_PORT_CSS_ADDRESS 0x3fffff +#define DMA_PORT_CSS_MAX_SIZE SZ_128 + +struct tb_dma_port *dma_port_alloc(struct tb_switch *sw); +void dma_port_free(struct tb_dma_port *dma); +int dma_port_flash_read(struct tb_dma_port *dma, unsigned int address, + void *buf, size_t size); +int dma_port_flash_update_auth(struct tb_dma_port *dma); +int dma_port_flash_update_auth_status(struct tb_dma_port *dma, u32 *status); +int dma_port_flash_write(struct tb_dma_port *dma, unsigned int address, + const void *buf, size_t size); +int dma_port_power_cycle(struct tb_dma_port *dma); + +#endif diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index d40a5f07fc4c..996c6e29c8ad 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -429,6 +429,50 @@ err: return -EINVAL; } +static int tb_drom_copy_nvm(struct tb_switch *sw, u16 *size) +{ + u32 drom_offset; + int ret; + + if (!sw->dma_port) + return -ENODEV; + + ret = tb_sw_read(sw, &drom_offset, TB_CFG_SWITCH, + sw->cap_plug_events + 12, 1); + if (ret) + return ret; + + if (!drom_offset) + return -ENODEV; + + ret = dma_port_flash_read(sw->dma_port, drom_offset + 14, size, + sizeof(*size)); + if (ret) + return ret; + + /* Size includes CRC8 + UID + CRC32 */ + *size += 1 + 8 + 4; + sw->drom = kzalloc(*size, GFP_KERNEL); + if (!sw->drom) + return -ENOMEM; + + ret = dma_port_flash_read(sw->dma_port, drom_offset, sw->drom, *size); + if (ret) + goto err_free; + + /* + * Read UID from the minimal DROM because the one in NVM is just + * a placeholder. + */ + tb_drom_read_uid_only(sw, &sw->uid); + return 0; + +err_free: + kfree(sw->drom); + sw->drom = NULL; + return ret; +} + /** * tb_drom_read - copy drom to sw->drom and parse it */ @@ -450,6 +494,10 @@ int tb_drom_read(struct tb_switch *sw) if (tb_drom_copy_efi(sw, &size) == 0) goto parse; + /* Non-Apple hardware has the DROM as part of NVM */ + if (tb_drom_copy_nvm(sw, &size) == 0) + goto parse; + /* * The root switch contains only a dummy drom (header only, * no entries). Hardcode the configuration here. @@ -510,7 +558,8 @@ parse: header->uid_crc8, crc); goto err; } - sw->uid = header->uid; + if (!sw->uid) + sw->uid = header->uid; sw->vendor = header->vendor_id; sw->device = header->model_id; diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 6384061100b0..4b47e0999cda 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -377,6 +377,8 @@ static void tb_switch_release(struct device *dev) { struct tb_switch *sw = tb_to_switch(dev); + dma_port_free(sw->dma_port); + kfree(sw->uuid); kfree(sw->device_name); kfree(sw->vendor_name); @@ -570,6 +572,25 @@ static void tb_switch_set_uuid(struct tb_switch *sw) sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); } +static void tb_switch_add_dma_port(struct tb_switch *sw) +{ + switch (sw->generation) { + case 3: + break; + + case 2: + /* Only root switch can be upgraded */ + if (tb_route(sw)) + return; + break; + + default: + return; + } + + sw->dma_port = dma_port_alloc(sw); +} + /** * tb_switch_add() - Add a switch to the domain * @sw: Switch to add @@ -586,6 +607,15 @@ int tb_switch_add(struct tb_switch *sw) { int i, ret; + /* + * Initialize DMA control port now before we read DROM. Recent + * host controllers have more complete DROM on NVM that includes + * vendor and model identification strings which we then expose + * to the userspace. NVM can be accessed through DMA + * configuration based mailbox. + */ + tb_switch_add_dma_port(sw); + /* read drom */ ret = tb_drom_read(sw); if (ret) { diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 39d24dff82c5..31521c531715 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -12,12 +12,16 @@ #include "tb_regs.h" #include "ctl.h" +#include "dma_port.h" /** * struct tb_switch - a thunderbolt switch * @dev: Device for the switch * @config: Switch configuration * @ports: Ports in this switch + * @dma_port: If the switch has port supporting DMA configuration based + * mailbox this will hold the pointer to that (%NULL + * otherwise). * @tb: Pointer to the domain the switch belongs to * @uid: Unique ID of the switch * @uuid: UUID of the switch (or %NULL if not supported) @@ -34,6 +38,7 @@ struct tb_switch { struct device dev; struct tb_regs_switch_header config; struct tb_port *ports; + struct tb_dma_port *dma_port; struct tb *tb; u64 uid; uuid_be *uuid; -- cgit v1.2.3 From bdccf295d7cdf6f28ceec1dcc31a79d0a1697d21 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:15 +0300 Subject: thunderbolt: Do not touch the hardware if the NHI is gone on resume On PCs the NHI host controller is only present when there is a device connected. When the last device is disconnected the host controller will dissappear shortly (within 10s). Now if that happens when we are suspended we should not try to touch the hardware anymore, so add a flag for this and check it before we re-enable rings. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/nhi.c | 12 ++++++++++++ drivers/thunderbolt/nhi.h | 3 +++ 2 files changed, 15 insertions(+) diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index c358c074f925..14311535661d 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -403,6 +403,8 @@ void ring_start(struct tb_ring *ring) { mutex_lock(&ring->nhi->lock); mutex_lock(&ring->lock); + if (ring->nhi->going_away) + goto err; if (ring->running) { dev_WARN(&ring->nhi->pdev->dev, "ring already started\n"); goto err; @@ -449,6 +451,8 @@ void ring_stop(struct tb_ring *ring) mutex_lock(&ring->lock); dev_info(&ring->nhi->pdev->dev, "stopping %s %d\n", RING_TYPE(ring), ring->hop); + if (ring->nhi->going_away) + goto err; if (!ring->running) { dev_WARN(&ring->nhi->pdev->dev, "%s %d already stopped\n", RING_TYPE(ring), ring->hop); @@ -653,6 +657,14 @@ static int nhi_resume_noirq(struct device *dev) struct pci_dev *pdev = to_pci_dev(dev); struct tb *tb = pci_get_drvdata(pdev); + /* + * Check that the device is still there. It may be that the user + * unplugged last device which causes the host controller to go + * away on PCs. + */ + if (!pci_device_is_present(pdev)) + tb->nhi->going_away = true; + return tb_domain_resume_noirq(tb); } diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h index 446ff6dac91d..953864ae0ab3 100644 --- a/drivers/thunderbolt/nhi.h +++ b/drivers/thunderbolt/nhi.h @@ -20,6 +20,8 @@ * @tx_rings: All Tx rings available on this host controller * @rx_rings: All Rx rings available on this host controller * @msix_ida: Used to allocate MSI-X vectors for rings + * @going_away: The host controller device is about to disappear so when + * this flag is set, avoid touching the hardware anymore. * @interrupt_work: Work scheduled to handle ring interrupt when no * MSI-X is used. * @hop_count: Number of rings (end point hops) supported by NHI. @@ -31,6 +33,7 @@ struct tb_nhi { struct tb_ring **tx_rings; struct tb_ring **rx_rings; struct ida msix_ida; + bool going_away; struct work_struct interrupt_work; u32 hop_count; }; -- cgit v1.2.3 From f67cf491175a315ca86c9b349708bfed7b1f40c1 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:16 +0300 Subject: thunderbolt: Add support for Internal Connection Manager (ICM) Starting from Intel Falcon Ridge the internal connection manager running on the Thunderbolt host controller has been supporting 4 security levels. One reason for this is to prevent DMA attacks and only allow connecting devices the user trusts. The internal connection manager (ICM) is the preferred way of connecting Thunderbolt devices over software only implementation typically used on Macs. The driver communicates with ICM using special Thunderbolt ring 0 (control channel) messages. In order to handle these messages we add support for the ICM messages to the control channel. The security levels are as follows: none - No security, all tunnels are created automatically user - User needs to approve the device before tunnels are created secure - User need to approve the device before tunnels are created. The device is sent a challenge on future connects to be able to verify it is actually the approved device. dponly - Only Display Port and USB tunnels can be created and those are created automatically. The security levels are typically configurable from the system BIOS and by default it is set to "user" on many systems. In this patch each Thunderbolt device will have either one or two new sysfs attributes: authorized and key. The latter appears for devices that support secure connect. In order to identify the device the user can read identication information, including UUID and name of the device from sysfs and based on that make a decision to authorize the device. The device is authorized by simply writing 1 to the "authorized" sysfs attribute. This is following the USB bus device authorization mechanism. The secure connect requires an additional challenge step (writing 2 to the "authorized" attribute) in future connects when the key has already been stored to the NVM of the device. Non-ICM systems (before Alpine Ridge) continue to use the existing functionality and the security level is set to none. For systems with Alpine Ridge, even on Apple hardware, we will use ICM. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-bus-thunderbolt | 48 + drivers/thunderbolt/Kconfig | 12 +- drivers/thunderbolt/Makefile | 2 +- drivers/thunderbolt/ctl.c | 2 + drivers/thunderbolt/domain.c | 195 +++++ drivers/thunderbolt/icm.c | 1058 +++++++++++++++++++++++ drivers/thunderbolt/nhi.c | 33 +- drivers/thunderbolt/nhi_regs.h | 7 + drivers/thunderbolt/switch.c | 222 +++++ drivers/thunderbolt/tb.c | 7 + drivers/thunderbolt/tb.h | 79 ++ drivers/thunderbolt/tb_msgs.h | 152 ++++ 12 files changed, 1805 insertions(+), 12 deletions(-) create mode 100644 drivers/thunderbolt/icm.c diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt index 29a516f53d2c..05b7f9a6431f 100644 --- a/Documentation/ABI/testing/sysfs-bus-thunderbolt +++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt @@ -1,3 +1,51 @@ +What: /sys/bus/thunderbolt/devices/.../domainX/security +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute holds current Thunderbolt security level + set by the system BIOS. Possible values are: + + none: All devices are automatically authorized + user: Devices are only authorized based on writing + appropriate value to the authorized attribute + secure: Require devices that support secure connect at + minimum. User needs to authorize each device. + dponly: Automatically tunnel Display port (and USB). No + PCIe tunnels are created. + +What: /sys/bus/thunderbolt/devices/.../authorized +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: This attribute is used to authorize Thunderbolt devices + after they have been connected. If the device is not + authorized, no devices such as PCIe and Display port are + available to the system. + + Contents of this attribute will be 0 when the device is not + yet authorized. + + Possible values are supported: + 1: The device will be authorized and connected + + When key attribute contains 32 byte hex string the possible + values are: + 1: The 32 byte hex string is added to the device NVM and + the device is authorized. + 2: Send a challenge based on the 32 byte hex string. If the + challenge response from device is valid, the device is + authorized. In case of failure errno will be ENOKEY if + the device did not contain a key at all, and + EKEYREJECTED if the challenge response did not match. + +What: /sys/bus/thunderbolt/devices/.../key +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: When a devices supports Thunderbolt secure connect it will + have this attribute. Writing 32 byte hex string changes + authorization to use the secure connection method instead. + What: /sys/bus/thunderbolt/devices/.../device Date: Sep 2017 KernelVersion: 4.13 diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig index d35db16aa43f..a9cc724985ad 100644 --- a/drivers/thunderbolt/Kconfig +++ b/drivers/thunderbolt/Kconfig @@ -1,15 +1,15 @@ menuconfig THUNDERBOLT - tristate "Thunderbolt support for Apple devices" + tristate "Thunderbolt support" depends on PCI depends on X86 || COMPILE_TEST select APPLE_PROPERTIES if EFI_STUB && X86 select CRC32 + select CRYPTO + select CRYPTO_HASH help - Cactus Ridge Thunderbolt Controller driver - This driver is required if you want to hotplug Thunderbolt devices on - Apple hardware. - - Device chaining is currently not supported. + Thunderbolt Controller driver. This driver is required if you + want to hotplug Thunderbolt devices on Apple hardware or on PCs + with Intel Falcon Ridge or newer. To compile this driver a module, choose M here. The module will be called thunderbolt. diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile index 9828e862dd35..4900febc6c8a 100644 --- a/drivers/thunderbolt/Makefile +++ b/drivers/thunderbolt/Makefile @@ -1,3 +1,3 @@ obj-${CONFIG_THUNDERBOLT} := thunderbolt.o thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel_pci.o eeprom.o -thunderbolt-objs += domain.o dma_port.o +thunderbolt-objs += domain.o dma_port.o icm.o diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c index 27c30ff79a84..69c0232a22f8 100644 --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -463,6 +463,8 @@ static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, "RX: checksum mismatch, dropping packet\n"); goto rx; } + /* Fall through */ + case TB_CFG_PKG_ICM_EVENT: tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size); goto rx; diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c index 54bc15f9bf6b..f71b63e90016 100644 --- a/drivers/thunderbolt/domain.c +++ b/drivers/thunderbolt/domain.c @@ -13,11 +13,43 @@ #include #include #include +#include +#include #include "tb.h" static DEFINE_IDA(tb_domain_ida); +static const char * const tb_security_names[] = { + [TB_SECURITY_NONE] = "none", + [TB_SECURITY_USER] = "user", + [TB_SECURITY_SECURE] = "secure", + [TB_SECURITY_DPONLY] = "dponly", +}; + +static ssize_t security_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tb *tb = container_of(dev, struct tb, dev); + + return sprintf(buf, "%s\n", tb_security_names[tb->security_level]); +} +static DEVICE_ATTR_RO(security); + +static struct attribute *domain_attrs[] = { + &dev_attr_security.attr, + NULL, +}; + +static struct attribute_group domain_attr_group = { + .attrs = domain_attrs, +}; + +static const struct attribute_group *domain_attr_groups[] = { + &domain_attr_group, + NULL, +}; + struct bus_type tb_bus_type = { .name = "thunderbolt", }; @@ -82,6 +114,7 @@ struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize) tb->dev.parent = &nhi->pdev->dev; tb->dev.bus = &tb_bus_type; tb->dev.type = &tb_domain_type; + tb->dev.groups = domain_attr_groups; dev_set_name(&tb->dev, "domain%d", tb->index); device_initialize(&tb->dev); @@ -140,6 +173,12 @@ int tb_domain_add(struct tb *tb) */ tb_ctl_start(tb->ctl); + if (tb->cm_ops->driver_ready) { + ret = tb->cm_ops->driver_ready(tb); + if (ret) + goto err_ctl_stop; + } + ret = device_add(&tb->dev); if (ret) goto err_ctl_stop; @@ -231,6 +270,162 @@ int tb_domain_resume_noirq(struct tb *tb) return ret; } +int tb_domain_suspend(struct tb *tb) +{ + int ret; + + mutex_lock(&tb->lock); + if (tb->cm_ops->suspend) { + ret = tb->cm_ops->suspend(tb); + if (ret) { + mutex_unlock(&tb->lock); + return ret; + } + } + mutex_unlock(&tb->lock); + return 0; +} + +void tb_domain_complete(struct tb *tb) +{ + mutex_lock(&tb->lock); + if (tb->cm_ops->complete) + tb->cm_ops->complete(tb); + mutex_unlock(&tb->lock); +} + +/** + * tb_domain_approve_switch() - Approve switch + * @tb: Domain the switch belongs to + * @sw: Switch to approve + * + * This will approve switch by connection manager specific means. In + * case of success the connection manager will create tunnels for all + * supported protocols. + */ +int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw) +{ + struct tb_switch *parent_sw; + + if (!tb->cm_ops->approve_switch) + return -EPERM; + + /* The parent switch must be authorized before this one */ + parent_sw = tb_to_switch(sw->dev.parent); + if (!parent_sw || !parent_sw->authorized) + return -EINVAL; + + return tb->cm_ops->approve_switch(tb, sw); +} + +/** + * tb_domain_approve_switch_key() - Approve switch and add key + * @tb: Domain the switch belongs to + * @sw: Switch to approve + * + * For switches that support secure connect, this function first adds + * key to the switch NVM using connection manager specific means. If + * adding the key is successful, the switch is approved and connected. + * + * Return: %0 on success and negative errno in case of failure. + */ +int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw) +{ + struct tb_switch *parent_sw; + int ret; + + if (!tb->cm_ops->approve_switch || !tb->cm_ops->add_switch_key) + return -EPERM; + + /* The parent switch must be authorized before this one */ + parent_sw = tb_to_switch(sw->dev.parent); + if (!parent_sw || !parent_sw->authorized) + return -EINVAL; + + ret = tb->cm_ops->add_switch_key(tb, sw); + if (ret) + return ret; + + return tb->cm_ops->approve_switch(tb, sw); +} + +/** + * tb_domain_challenge_switch_key() - Challenge and approve switch + * @tb: Domain the switch belongs to + * @sw: Switch to approve + * + * For switches that support secure connect, this function generates + * random challenge and sends it to the switch. The switch responds to + * this and if the response matches our random challenge, the switch is + * approved and connected. + * + * Return: %0 on success and negative errno in case of failure. + */ +int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw) +{ + u8 challenge[TB_SWITCH_KEY_SIZE]; + u8 response[TB_SWITCH_KEY_SIZE]; + u8 hmac[TB_SWITCH_KEY_SIZE]; + struct tb_switch *parent_sw; + struct crypto_shash *tfm; + struct shash_desc *shash; + int ret; + + if (!tb->cm_ops->approve_switch || !tb->cm_ops->challenge_switch_key) + return -EPERM; + + /* The parent switch must be authorized before this one */ + parent_sw = tb_to_switch(sw->dev.parent); + if (!parent_sw || !parent_sw->authorized) + return -EINVAL; + + get_random_bytes(challenge, sizeof(challenge)); + ret = tb->cm_ops->challenge_switch_key(tb, sw, challenge, response); + if (ret) + return ret; + + tfm = crypto_alloc_shash("hmac(sha256)", 0, 0); + if (IS_ERR(tfm)) + return PTR_ERR(tfm); + + ret = crypto_shash_setkey(tfm, sw->key, TB_SWITCH_KEY_SIZE); + if (ret) + goto err_free_tfm; + + shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm), + GFP_KERNEL); + if (!shash) { + ret = -ENOMEM; + goto err_free_tfm; + } + + shash->tfm = tfm; + shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP; + + memset(hmac, 0, sizeof(hmac)); + ret = crypto_shash_digest(shash, challenge, sizeof(hmac), hmac); + if (ret) + goto err_free_shash; + + /* The returned HMAC must match the one we calculated */ + if (memcmp(response, hmac, sizeof(hmac))) { + ret = -EKEYREJECTED; + goto err_free_shash; + } + + crypto_free_shash(tfm); + kfree(shash); + + return tb->cm_ops->approve_switch(tb, sw); + +err_free_shash: + kfree(shash); +err_free_tfm: + crypto_free_shash(tfm); + + return ret; +} + int tb_domain_init(void) { return bus_register(&tb_bus_type); diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c new file mode 100644 index 000000000000..0ffa4ec249ac --- /dev/null +++ b/drivers/thunderbolt/icm.c @@ -0,0 +1,1058 @@ +/* + * Internal Thunderbolt Connection Manager. This is a firmware running on + * the Thunderbolt host controller performing most of the low-level + * handling. + * + * Copyright (C) 2017, Intel Corporation + * Authors: Michael Jamet + * Mika Westerberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "ctl.h" +#include "nhi_regs.h" +#include "tb.h" + +#define PCIE2CIO_CMD 0x30 +#define PCIE2CIO_CMD_TIMEOUT BIT(31) +#define PCIE2CIO_CMD_START BIT(30) +#define PCIE2CIO_CMD_WRITE BIT(21) +#define PCIE2CIO_CMD_CS_MASK GENMASK(20, 19) +#define PCIE2CIO_CMD_CS_SHIFT 19 +#define PCIE2CIO_CMD_PORT_MASK GENMASK(18, 13) +#define PCIE2CIO_CMD_PORT_SHIFT 13 + +#define PCIE2CIO_WRDATA 0x34 +#define PCIE2CIO_RDDATA 0x38 + +#define PHY_PORT_CS1 0x37 +#define PHY_PORT_CS1_LINK_DISABLE BIT(14) +#define PHY_PORT_CS1_LINK_STATE_MASK GENMASK(29, 26) +#define PHY_PORT_CS1_LINK_STATE_SHIFT 26 + +#define ICM_TIMEOUT 5000 /* ms */ +#define ICM_MAX_LINK 4 +#define ICM_MAX_DEPTH 6 + +/** + * struct icm - Internal connection manager private data + * @request_lock: Makes sure only one message is send to ICM at time + * @rescan_work: Work used to rescan the surviving switches after resume + * @upstream_port: Pointer to the PCIe upstream port this host + * controller is connected. This is only set for systems + * where ICM needs to be started manually + * @vnd_cap: Vendor defined capability where PCIe2CIO mailbox resides + * (only set when @upstream_port is not %NULL) + * @is_supported: Checks if we can support ICM on this controller + * @get_mode: Read and return the ICM firmware mode (optional) + * @get_route: Find a route string for given switch + * @device_connected: Handle device connected ICM message + * @device_disconnected: Handle device disconnected ICM message + */ +struct icm { + struct mutex request_lock; + struct delayed_work rescan_work; + struct pci_dev *upstream_port; + int vnd_cap; + bool (*is_supported)(struct tb *tb); + int (*get_mode)(struct tb *tb); + int (*get_route)(struct tb *tb, u8 link, u8 depth, u64 *route); + void (*device_connected)(struct tb *tb, + const struct icm_pkg_header *hdr); + void (*device_disconnected)(struct tb *tb, + const struct icm_pkg_header *hdr); +}; + +struct icm_notification { + struct work_struct work; + struct icm_pkg_header *pkg; + struct tb *tb; +}; + +static inline struct tb *icm_to_tb(struct icm *icm) +{ + return ((void *)icm - sizeof(struct tb)); +} + +static inline u8 phy_port_from_route(u64 route, u8 depth) +{ + return tb_switch_phy_port_from_link(route >> ((depth - 1) * 8)); +} + +static inline u8 dual_link_from_link(u8 link) +{ + return link ? ((link - 1) ^ 0x01) + 1 : 0; +} + +static inline u64 get_route(u32 route_hi, u32 route_lo) +{ + return (u64)route_hi << 32 | route_lo; +} + +static inline bool is_apple(void) +{ + return dmi_match(DMI_BOARD_VENDOR, "Apple Inc."); +} + +static bool icm_match(const struct tb_cfg_request *req, + const struct ctl_pkg *pkg) +{ + const struct icm_pkg_header *res_hdr = pkg->buffer; + const struct icm_pkg_header *req_hdr = req->request; + + if (pkg->frame.eof != req->response_type) + return false; + if (res_hdr->code != req_hdr->code) + return false; + + return true; +} + +static bool icm_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg) +{ + const struct icm_pkg_header *hdr = pkg->buffer; + + if (hdr->packet_id < req->npackets) { + size_t offset = hdr->packet_id * req->response_size; + + memcpy(req->response + offset, pkg->buffer, req->response_size); + } + + return hdr->packet_id == hdr->total_packets - 1; +} + +static int icm_request(struct tb *tb, const void *request, size_t request_size, + void *response, size_t response_size, size_t npackets, + unsigned int timeout_msec) +{ + struct icm *icm = tb_priv(tb); + int retries = 3; + + do { + struct tb_cfg_request *req; + struct tb_cfg_result res; + + req = tb_cfg_request_alloc(); + if (!req) + return -ENOMEM; + + req->match = icm_match; + req->copy = icm_copy; + req->request = request; + req->request_size = request_size; + req->request_type = TB_CFG_PKG_ICM_CMD; + req->response = response; + req->npackets = npackets; + req->response_size = response_size; + req->response_type = TB_CFG_PKG_ICM_RESP; + + mutex_lock(&icm->request_lock); + res = tb_cfg_request_sync(tb->ctl, req, timeout_msec); + mutex_unlock(&icm->request_lock); + + tb_cfg_request_put(req); + + if (res.err != -ETIMEDOUT) + return res.err == 1 ? -EIO : res.err; + + usleep_range(20, 50); + } while (retries--); + + return -ETIMEDOUT; +} + +static bool icm_fr_is_supported(struct tb *tb) +{ + return !is_apple(); +} + +static inline int icm_fr_get_switch_index(u32 port) +{ + int index; + + if ((port & ICM_PORT_TYPE_MASK) != TB_TYPE_PORT) + return 0; + + index = port >> ICM_PORT_INDEX_SHIFT; + return index != 0xff ? index : 0; +} + +static int icm_fr_get_route(struct tb *tb, u8 link, u8 depth, u64 *route) +{ + struct icm_fr_pkg_get_topology_response *switches, *sw; + struct icm_fr_pkg_get_topology request = { + .hdr = { .code = ICM_GET_TOPOLOGY }, + }; + size_t npackets = ICM_GET_TOPOLOGY_PACKETS; + int ret, index; + u8 i; + + switches = kcalloc(npackets, sizeof(*switches), GFP_KERNEL); + if (!switches) + return -ENOMEM; + + ret = icm_request(tb, &request, sizeof(request), switches, + sizeof(*switches), npackets, ICM_TIMEOUT); + if (ret) + goto err_free; + + sw = &switches[0]; + index = icm_fr_get_switch_index(sw->ports[link]); + if (!index) { + ret = -ENODEV; + goto err_free; + } + + sw = &switches[index]; + for (i = 1; i < depth; i++) { + unsigned int j; + + if (!(sw->first_data & ICM_SWITCH_USED)) { + ret = -ENODEV; + goto err_free; + } + + for (j = 0; j < ARRAY_SIZE(sw->ports); j++) { + index = icm_fr_get_switch_index(sw->ports[j]); + if (index > sw->switch_index) { + sw = &switches[index]; + break; + } + } + } + + *route = get_route(sw->route_hi, sw->route_lo); + +err_free: + kfree(switches); + return ret; +} + +static int icm_fr_approve_switch(struct tb *tb, struct tb_switch *sw) +{ + struct icm_fr_pkg_approve_device request; + struct icm_fr_pkg_approve_device reply; + int ret; + + memset(&request, 0, sizeof(request)); + memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid)); + request.hdr.code = ICM_APPROVE_DEVICE; + request.connection_id = sw->connection_id; + request.connection_key = sw->connection_key; + + memset(&reply, 0, sizeof(reply)); + /* Use larger timeout as establishing tunnels can take some time */ + ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), + 1, 10000); + if (ret) + return ret; + + if (reply.hdr.flags & ICM_FLAGS_ERROR) { + tb_warn(tb, "PCIe tunnel creation failed\n"); + return -EIO; + } + + return 0; +} + +static int icm_fr_add_switch_key(struct tb *tb, struct tb_switch *sw) +{ + struct icm_fr_pkg_add_device_key request; + struct icm_fr_pkg_add_device_key_response reply; + int ret; + + memset(&request, 0, sizeof(request)); + memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid)); + request.hdr.code = ICM_ADD_DEVICE_KEY; + request.connection_id = sw->connection_id; + request.connection_key = sw->connection_key; + memcpy(request.key, sw->key, TB_SWITCH_KEY_SIZE); + + memset(&reply, 0, sizeof(reply)); + ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), + 1, ICM_TIMEOUT); + if (ret) + return ret; + + if (reply.hdr.flags & ICM_FLAGS_ERROR) { + tb_warn(tb, "Adding key to switch failed\n"); + return -EIO; + } + + return 0; +} + +static int icm_fr_challenge_switch_key(struct tb *tb, struct tb_switch *sw, + const u8 *challenge, u8 *response) +{ + struct icm_fr_pkg_challenge_device request; + struct icm_fr_pkg_challenge_device_response reply; + int ret; + + memset(&request, 0, sizeof(request)); + memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid)); + request.hdr.code = ICM_CHALLENGE_DEVICE; + request.connection_id = sw->connection_id; + request.connection_key = sw->connection_key; + memcpy(request.challenge, challenge, TB_SWITCH_KEY_SIZE); + + memset(&reply, 0, sizeof(reply)); + ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), + 1, ICM_TIMEOUT); + if (ret) + return ret; + + if (reply.hdr.flags & ICM_FLAGS_ERROR) + return -EKEYREJECTED; + if (reply.hdr.flags & ICM_FLAGS_NO_KEY) + return -ENOKEY; + + memcpy(response, reply.response, TB_SWITCH_KEY_SIZE); + + return 0; +} + +static void remove_switch(struct tb_switch *sw) +{ + struct tb_switch *parent_sw; + + parent_sw = tb_to_switch(sw->dev.parent); + tb_port_at(tb_route(sw), parent_sw)->remote = NULL; + tb_switch_remove(sw); +} + +static void +icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr) +{ + const struct icm_fr_event_device_connected *pkg = + (const struct icm_fr_event_device_connected *)hdr; + struct tb_switch *sw, *parent_sw; + struct icm *icm = tb_priv(tb); + bool authorized = false; + u8 link, depth; + u64 route; + int ret; + + link = pkg->link_info & ICM_LINK_INFO_LINK_MASK; + depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >> + ICM_LINK_INFO_DEPTH_SHIFT; + authorized = pkg->link_info & ICM_LINK_INFO_APPROVED; + + ret = icm->get_route(tb, link, depth, &route); + if (ret) { + tb_err(tb, "failed to find route string for switch at %u.%u\n", + link, depth); + return; + } + + sw = tb_switch_find_by_uuid(tb, &pkg->ep_uuid); + if (sw) { + u8 phy_port, sw_phy_port; + + parent_sw = tb_to_switch(sw->dev.parent); + sw_phy_port = phy_port_from_route(tb_route(sw), sw->depth); + phy_port = phy_port_from_route(route, depth); + + /* + * On resume ICM will send us connected events for the + * devices that still are present. However, that + * information might have changed for example by the + * fact that a switch on a dual-link connection might + * have been enumerated using the other link now. Make + * sure our book keeping matches that. + */ + if (sw->depth == depth && sw_phy_port == phy_port && + !!sw->authorized == authorized) { + tb_port_at(tb_route(sw), parent_sw)->remote = NULL; + tb_port_at(route, parent_sw)->remote = + tb_upstream_port(sw); + sw->config.route_hi = upper_32_bits(route); + sw->config.route_lo = lower_32_bits(route); + sw->connection_id = pkg->connection_id; + sw->connection_key = pkg->connection_key; + sw->link = link; + sw->depth = depth; + sw->is_unplugged = false; + tb_switch_put(sw); + return; + } + + /* + * User connected the same switch to another physical + * port or to another part of the topology. Remove the + * existing switch now before adding the new one. + */ + remove_switch(sw); + tb_switch_put(sw); + } + + /* + * If the switch was not found by UUID, look for a switch on + * same physical port (taking possible link aggregation into + * account) and depth. If we found one it is definitely a stale + * one so remove it first. + */ + sw = tb_switch_find_by_link_depth(tb, link, depth); + if (!sw) { + u8 dual_link; + + dual_link = dual_link_from_link(link); + if (dual_link) + sw = tb_switch_find_by_link_depth(tb, dual_link, depth); + } + if (sw) { + remove_switch(sw); + tb_switch_put(sw); + } + + parent_sw = tb_switch_find_by_link_depth(tb, link, depth - 1); + if (!parent_sw) { + tb_err(tb, "failed to find parent switch for %u.%u\n", + link, depth); + return; + } + + sw = tb_switch_alloc(tb, &parent_sw->dev, route); + if (!sw) { + tb_switch_put(parent_sw); + return; + } + + sw->uuid = kmemdup(&pkg->ep_uuid, sizeof(pkg->ep_uuid), GFP_KERNEL); + sw->connection_id = pkg->connection_id; + sw->connection_key = pkg->connection_key; + sw->link = link; + sw->depth = depth; + sw->authorized = authorized; + sw->security_level = (pkg->hdr.flags & ICM_FLAGS_SLEVEL_MASK) >> + ICM_FLAGS_SLEVEL_SHIFT; + + /* Link the two switches now */ + tb_port_at(route, parent_sw)->remote = tb_upstream_port(sw); + tb_upstream_port(sw)->remote = tb_port_at(route, parent_sw); + + ret = tb_switch_add(sw); + if (ret) { + tb_port_at(tb_route(sw), parent_sw)->remote = NULL; + tb_switch_put(sw); + } + tb_switch_put(parent_sw); +} + +static void +icm_fr_device_disconnected(struct tb *tb, const struct icm_pkg_header *hdr) +{ + const struct icm_fr_event_device_disconnected *pkg = + (const struct icm_fr_event_device_disconnected *)hdr; + struct tb_switch *sw; + u8 link, depth; + + link = pkg->link_info & ICM_LINK_INFO_LINK_MASK; + depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >> + ICM_LINK_INFO_DEPTH_SHIFT; + + if (link > ICM_MAX_LINK || depth > ICM_MAX_DEPTH) { + tb_warn(tb, "invalid topology %u.%u, ignoring\n", link, depth); + return; + } + + sw = tb_switch_find_by_link_depth(tb, link, depth); + if (!sw) { + tb_warn(tb, "no switch exists at %u.%u, ignoring\n", link, + depth); + return; + } + + remove_switch(sw); + tb_switch_put(sw); +} + +static struct pci_dev *get_upstream_port(struct pci_dev *pdev) +{ + struct pci_dev *parent; + + parent = pci_upstream_bridge(pdev); + while (parent) { + if (!pci_is_pcie(parent)) + return NULL; + if (pci_pcie_type(parent) == PCI_EXP_TYPE_UPSTREAM) + break; + parent = pci_upstream_bridge(parent); + } + + if (!parent) + return NULL; + + switch (parent->device) { + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE: + return parent; + } + + return NULL; +} + +static bool icm_ar_is_supported(struct tb *tb) +{ + struct pci_dev *upstream_port; + struct icm *icm = tb_priv(tb); + + /* + * Starting from Alpine Ridge we can use ICM on Apple machines + * as well. We just need to reset and re-enable it first. + */ + if (!is_apple()) + return true; + + /* + * Find the upstream PCIe port in case we need to do reset + * through its vendor specific registers. + */ + upstream_port = get_upstream_port(tb->nhi->pdev); + if (upstream_port) { + int cap; + + cap = pci_find_ext_capability(upstream_port, + PCI_EXT_CAP_ID_VNDR); + if (cap > 0) { + icm->upstream_port = upstream_port; + icm->vnd_cap = cap; + + return true; + } + } + + return false; +} + +static int icm_ar_get_mode(struct tb *tb) +{ + struct tb_nhi *nhi = tb->nhi; + int retries = 5; + u32 val; + + do { + val = ioread32(nhi->iobase + REG_FW_STS); + if (val & REG_FW_STS_NVM_AUTH_DONE) + break; + msleep(30); + } while (--retries); + + if (!retries) { + dev_err(&nhi->pdev->dev, "ICM firmware not authenticated\n"); + return -ENODEV; + } + + return nhi_mailbox_mode(nhi); +} + +static int icm_ar_get_route(struct tb *tb, u8 link, u8 depth, u64 *route) +{ + struct icm_ar_pkg_get_route_response reply; + struct icm_ar_pkg_get_route request = { + .hdr = { .code = ICM_GET_ROUTE }, + .link_info = depth << ICM_LINK_INFO_DEPTH_SHIFT | link, + }; + int ret; + + memset(&reply, 0, sizeof(reply)); + ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), + 1, ICM_TIMEOUT); + if (ret) + return ret; + + if (reply.hdr.flags & ICM_FLAGS_ERROR) + return -EIO; + + *route = get_route(reply.route_hi, reply.route_lo); + return 0; +} + +static void icm_handle_notification(struct work_struct *work) +{ + struct icm_notification *n = container_of(work, typeof(*n), work); + struct tb *tb = n->tb; + struct icm *icm = tb_priv(tb); + + mutex_lock(&tb->lock); + + switch (n->pkg->code) { + case ICM_EVENT_DEVICE_CONNECTED: + icm->device_connected(tb, n->pkg); + break; + case ICM_EVENT_DEVICE_DISCONNECTED: + icm->device_disconnected(tb, n->pkg); + break; + } + + mutex_unlock(&tb->lock); + + kfree(n->pkg); + kfree(n); +} + +static void icm_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, + const void *buf, size_t size) +{ + struct icm_notification *n; + + n = kmalloc(sizeof(*n), GFP_KERNEL); + if (!n) + return; + + INIT_WORK(&n->work, icm_handle_notification); + n->pkg = kmemdup(buf, size, GFP_KERNEL); + n->tb = tb; + + queue_work(tb->wq, &n->work); +} + +static int +__icm_driver_ready(struct tb *tb, enum tb_security_level *security_level) +{ + struct icm_pkg_driver_ready_response reply; + struct icm_pkg_driver_ready request = { + .hdr.code = ICM_DRIVER_READY, + }; + unsigned int retries = 10; + int ret; + + memset(&reply, 0, sizeof(reply)); + ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), + 1, ICM_TIMEOUT); + if (ret) + return ret; + + if (security_level) + *security_level = reply.security_level & 0xf; + + /* + * Hold on here until the switch config space is accessible so + * that we can read root switch config successfully. + */ + do { + struct tb_cfg_result res; + u32 tmp; + + res = tb_cfg_read_raw(tb->ctl, &tmp, 0, 0, TB_CFG_SWITCH, + 0, 1, 100); + if (!res.err) + return 0; + + msleep(50); + } while (--retries); + + return -ETIMEDOUT; +} + +static int pci2cio_wait_completion(struct icm *icm, unsigned long timeout_msec) +{ + unsigned long end = jiffies + msecs_to_jiffies(timeout_msec); + u32 cmd; + + do { + pci_read_config_dword(icm->upstream_port, + icm->vnd_cap + PCIE2CIO_CMD, &cmd); + if (!(cmd & PCIE2CIO_CMD_START)) { + if (cmd & PCIE2CIO_CMD_TIMEOUT) + break; + return 0; + } + + msleep(50); + } while (time_before(jiffies, end)); + + return -ETIMEDOUT; +} + +static int pcie2cio_read(struct icm *icm, enum tb_cfg_space cs, + unsigned int port, unsigned int index, u32 *data) +{ + struct pci_dev *pdev = icm->upstream_port; + int ret, vnd_cap = icm->vnd_cap; + u32 cmd; + + cmd = index; + cmd |= (port << PCIE2CIO_CMD_PORT_SHIFT) & PCIE2CIO_CMD_PORT_MASK; + cmd |= (cs << PCIE2CIO_CMD_CS_SHIFT) & PCIE2CIO_CMD_CS_MASK; + cmd |= PCIE2CIO_CMD_START; + pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_CMD, cmd); + + ret = pci2cio_wait_completion(icm, 5000); + if (ret) + return ret; + + pci_read_config_dword(pdev, vnd_cap + PCIE2CIO_RDDATA, data); + return 0; +} + +static int pcie2cio_write(struct icm *icm, enum tb_cfg_space cs, + unsigned int port, unsigned int index, u32 data) +{ + struct pci_dev *pdev = icm->upstream_port; + int vnd_cap = icm->vnd_cap; + u32 cmd; + + pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_WRDATA, data); + + cmd = index; + cmd |= (port << PCIE2CIO_CMD_PORT_SHIFT) & PCIE2CIO_CMD_PORT_MASK; + cmd |= (cs << PCIE2CIO_CMD_CS_SHIFT) & PCIE2CIO_CMD_CS_MASK; + cmd |= PCIE2CIO_CMD_WRITE | PCIE2CIO_CMD_START; + pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_CMD, cmd); + + return pci2cio_wait_completion(icm, 5000); +} + +static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi) +{ + struct icm *icm = tb_priv(tb); + u32 val; + + /* Put ARC to wait for CIO reset event to happen */ + val = ioread32(nhi->iobase + REG_FW_STS); + val |= REG_FW_STS_CIO_RESET_REQ; + iowrite32(val, nhi->iobase + REG_FW_STS); + + /* Re-start ARC */ + val = ioread32(nhi->iobase + REG_FW_STS); + val |= REG_FW_STS_ICM_EN_INVERT; + val |= REG_FW_STS_ICM_EN_CPU; + iowrite32(val, nhi->iobase + REG_FW_STS); + + /* Trigger CIO reset now */ + return pcie2cio_write(icm, TB_CFG_SWITCH, 0, 0x50, BIT(9)); +} + +static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi) +{ + unsigned int retries = 10; + int ret; + u32 val; + + /* Check if the ICM firmware is already running */ + val = ioread32(nhi->iobase + REG_FW_STS); + if (val & REG_FW_STS_ICM_EN) + return 0; + + dev_info(&nhi->pdev->dev, "starting ICM firmware\n"); + + ret = icm_firmware_reset(tb, nhi); + if (ret) + return ret; + + /* Wait until the ICM firmware tells us it is up and running */ + do { + /* Check that the ICM firmware is running */ + val = ioread32(nhi->iobase + REG_FW_STS); + if (val & REG_FW_STS_NVM_AUTH_DONE) + return 0; + + msleep(300); + } while (--retries); + + return -ETIMEDOUT; +} + +static int icm_reset_phy_port(struct tb *tb, int phy_port) +{ + struct icm *icm = tb_priv(tb); + u32 state0, state1; + int port0, port1; + u32 val0, val1; + int ret; + + if (!icm->upstream_port) + return 0; + + if (phy_port) { + port0 = 3; + port1 = 4; + } else { + port0 = 1; + port1 = 2; + } + + /* + * Read link status of both null ports belonging to a single + * physical port. + */ + ret = pcie2cio_read(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, &val0); + if (ret) + return ret; + ret = pcie2cio_read(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, &val1); + if (ret) + return ret; + + state0 = val0 & PHY_PORT_CS1_LINK_STATE_MASK; + state0 >>= PHY_PORT_CS1_LINK_STATE_SHIFT; + state1 = val1 & PHY_PORT_CS1_LINK_STATE_MASK; + state1 >>= PHY_PORT_CS1_LINK_STATE_SHIFT; + + /* If they are both up we need to reset them now */ + if (state0 != TB_PORT_UP || state1 != TB_PORT_UP) + return 0; + + val0 |= PHY_PORT_CS1_LINK_DISABLE; + ret = pcie2cio_write(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, val0); + if (ret) + return ret; + + val1 |= PHY_PORT_CS1_LINK_DISABLE; + ret = pcie2cio_write(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, val1); + if (ret) + return ret; + + /* Wait a bit and then re-enable both ports */ + usleep_range(10, 100); + + ret = pcie2cio_read(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, &val0); + if (ret) + return ret; + ret = pcie2cio_read(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, &val1); + if (ret) + return ret; + + val0 &= ~PHY_PORT_CS1_LINK_DISABLE; + ret = pcie2cio_write(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, val0); + if (ret) + return ret; + + val1 &= ~PHY_PORT_CS1_LINK_DISABLE; + return pcie2cio_write(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, val1); +} + +static int icm_firmware_init(struct tb *tb) +{ + struct icm *icm = tb_priv(tb); + struct tb_nhi *nhi = tb->nhi; + int ret; + + ret = icm_firmware_start(tb, nhi); + if (ret) { + dev_err(&nhi->pdev->dev, "could not start ICM firmware\n"); + return ret; + } + + if (icm->get_mode) { + ret = icm->get_mode(tb); + + switch (ret) { + case NHI_FW_CM_MODE: + /* Ask ICM to accept all Thunderbolt devices */ + nhi_mailbox_cmd(nhi, NHI_MAILBOX_ALLOW_ALL_DEVS, 0); + break; + + default: + tb_err(tb, "ICM firmware is in wrong mode: %u\n", ret); + return -ENODEV; + } + } + + /* + * Reset both physical ports if there is anything connected to + * them already. + */ + ret = icm_reset_phy_port(tb, 0); + if (ret) + dev_warn(&nhi->pdev->dev, "failed to reset links on port0\n"); + ret = icm_reset_phy_port(tb, 1); + if (ret) + dev_warn(&nhi->pdev->dev, "failed to reset links on port1\n"); + + return 0; +} + +static int icm_driver_ready(struct tb *tb) +{ + int ret; + + ret = icm_firmware_init(tb); + if (ret) + return ret; + + return __icm_driver_ready(tb, &tb->security_level); +} + +static int icm_suspend(struct tb *tb) +{ + return nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_SAVE_DEVS, 0); +} + +/* + * Mark all switches (except root switch) below this one unplugged. ICM + * firmware will send us an updated list of switches after we have send + * it driver ready command. If a switch is not in that list it will be + * removed when we perform rescan. + */ +static void icm_unplug_children(struct tb_switch *sw) +{ + unsigned int i; + + if (tb_route(sw)) + sw->is_unplugged = true; + + for (i = 1; i <= sw->config.max_port_number; i++) { + struct tb_port *port = &sw->ports[i]; + + if (tb_is_upstream_port(port)) + continue; + if (!port->remote) + continue; + + icm_unplug_children(port->remote->sw); + } +} + +static void icm_free_unplugged_children(struct tb_switch *sw) +{ + unsigned int i; + + for (i = 1; i <= sw->config.max_port_number; i++) { + struct tb_port *port = &sw->ports[i]; + + if (tb_is_upstream_port(port)) + continue; + if (!port->remote) + continue; + + if (port->remote->sw->is_unplugged) { + tb_switch_remove(port->remote->sw); + port->remote = NULL; + } else { + icm_free_unplugged_children(port->remote->sw); + } + } +} + +static void icm_rescan_work(struct work_struct *work) +{ + struct icm *icm = container_of(work, struct icm, rescan_work.work); + struct tb *tb = icm_to_tb(icm); + + mutex_lock(&tb->lock); + if (tb->root_switch) + icm_free_unplugged_children(tb->root_switch); + mutex_unlock(&tb->lock); +} + +static void icm_complete(struct tb *tb) +{ + struct icm *icm = tb_priv(tb); + + if (tb->nhi->going_away) + return; + + icm_unplug_children(tb->root_switch); + + /* + * Now all existing children should be resumed, start events + * from ICM to get updated status. + */ + __icm_driver_ready(tb, NULL); + + /* + * We do not get notifications of devices that have been + * unplugged during suspend so schedule rescan to clean them up + * if any. + */ + queue_delayed_work(tb->wq, &icm->rescan_work, msecs_to_jiffies(500)); +} + +static int icm_start(struct tb *tb) +{ + int ret; + + tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); + if (!tb->root_switch) + return -ENODEV; + + ret = tb_switch_add(tb->root_switch); + if (ret) + tb_switch_put(tb->root_switch); + + return ret; +} + +static void icm_stop(struct tb *tb) +{ + struct icm *icm = tb_priv(tb); + + cancel_delayed_work(&icm->rescan_work); + tb_switch_remove(tb->root_switch); + tb->root_switch = NULL; + nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DRV_UNLOADS, 0); +} + +/* Falcon Ridge and Alpine Ridge */ +static const struct tb_cm_ops icm_fr_ops = { + .driver_ready = icm_driver_ready, + .start = icm_start, + .stop = icm_stop, + .suspend = icm_suspend, + .complete = icm_complete, + .handle_event = icm_handle_event, + .approve_switch = icm_fr_approve_switch, + .add_switch_key = icm_fr_add_switch_key, + .challenge_switch_key = icm_fr_challenge_switch_key, +}; + +struct tb *icm_probe(struct tb_nhi *nhi) +{ + struct icm *icm; + struct tb *tb; + + tb = tb_domain_alloc(nhi, sizeof(struct icm)); + if (!tb) + return NULL; + + icm = tb_priv(tb); + INIT_DELAYED_WORK(&icm->rescan_work, icm_rescan_work); + mutex_init(&icm->request_lock); + + switch (nhi->pdev->device) { + case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI: + case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: + icm->is_supported = icm_fr_is_supported; + icm->get_route = icm_fr_get_route; + icm->device_connected = icm_fr_device_connected; + icm->device_disconnected = icm_fr_device_disconnected; + tb->cm_ops = &icm_fr_ops; + break; + + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI: + case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI: + icm->is_supported = icm_ar_is_supported; + icm->get_mode = icm_ar_get_mode; + icm->get_route = icm_ar_get_route; + icm->device_connected = icm_fr_device_connected; + icm->device_disconnected = icm_fr_device_disconnected; + tb->cm_ops = &icm_fr_ops; + break; + } + + if (!icm->is_supported || !icm->is_supported(tb)) { + dev_dbg(&nhi->pdev->dev, "ICM not supported on this controller\n"); + tb_domain_put(tb); + return NULL; + } + + return tb; +} diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index 14311535661d..05af126a2435 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -13,7 +13,6 @@ #include #include #include -#include #include #include "nhi.h" @@ -668,6 +667,22 @@ static int nhi_resume_noirq(struct device *dev) return tb_domain_resume_noirq(tb); } +static int nhi_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct tb *tb = pci_get_drvdata(pdev); + + return tb_domain_suspend(tb); +} + +static void nhi_complete(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct tb *tb = pci_get_drvdata(pdev); + + tb_domain_complete(tb); +} + static void nhi_shutdown(struct tb_nhi *nhi) { int i; @@ -784,10 +799,16 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) /* magic value - clock related? */ iowrite32(3906250 / 10000, nhi->iobase + 0x38c00); - dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); - tb = tb_probe(nhi); + tb = icm_probe(nhi); if (!tb) + tb = tb_probe(nhi); + if (!tb) { + dev_err(&nhi->pdev->dev, + "failed to determine connection manager, aborting\n"); return -ENODEV; + } + + dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); res = tb_domain_add(tb); if (res) { @@ -826,6 +847,10 @@ static const struct dev_pm_ops nhi_pm_ops = { * pci-tunnels stay alive. */ .restore_noirq = nhi_resume_noirq, + .suspend = nhi_suspend, + .freeze = nhi_suspend, + .poweroff = nhi_suspend, + .complete = nhi_complete, }; static struct pci_device_id nhi_ids[] = { @@ -886,8 +911,6 @@ static int __init nhi_init(void) { int ret; - if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc.")) - return -ENOSYS; ret = tb_domain_init(); if (ret) return ret; diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h index 322fe1fa3a3c..09ed574e92ff 100644 --- a/drivers/thunderbolt/nhi_regs.h +++ b/drivers/thunderbolt/nhi_regs.h @@ -118,4 +118,11 @@ struct ring_desc { #define REG_OUTMAIL_CMD_OPMODE_SHIFT 8 #define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8) +#define REG_FW_STS 0x39944 +#define REG_FW_STS_NVM_AUTH_DONE BIT(31) +#define REG_FW_STS_CIO_RESET_REQ BIT(30) +#define REG_FW_STS_ICM_EN_CPU BIT(2) +#define REG_FW_STS_ICM_EN_INVERT BIT(1) +#define REG_FW_STS_ICM_EN BIT(0) + #endif diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 4b47e0999cda..1524edf42ee8 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -9,6 +9,9 @@ #include "tb.h" +/* Switch authorization from userspace is serialized by this lock */ +static DEFINE_MUTEX(switch_lock); + /* port utility functions */ static const char *tb_port_type(struct tb_regs_port_header *port) @@ -310,6 +313,75 @@ static int tb_plug_events_active(struct tb_switch *sw, bool active) sw->cap_plug_events + 1, 1); } +static ssize_t authorized_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + + return sprintf(buf, "%u\n", sw->authorized); +} + +static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val) +{ + int ret = -EINVAL; + + if (mutex_lock_interruptible(&switch_lock)) + return -ERESTARTSYS; + + if (sw->authorized) + goto unlock; + + switch (val) { + /* Approve switch */ + case 1: + if (sw->key) + ret = tb_domain_approve_switch_key(sw->tb, sw); + else + ret = tb_domain_approve_switch(sw->tb, sw); + break; + + /* Challenge switch */ + case 2: + if (sw->key) + ret = tb_domain_challenge_switch_key(sw->tb, sw); + break; + + default: + break; + } + + if (!ret) { + sw->authorized = val; + /* Notify status change to the userspace */ + kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); + } + +unlock: + mutex_unlock(&switch_lock); + return ret; +} + +static ssize_t authorized_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tb_switch *sw = tb_to_switch(dev); + unsigned int val; + ssize_t ret; + + ret = kstrtouint(buf, 0, &val); + if (ret) + return ret; + if (val > 2) + return -EINVAL; + + ret = tb_switch_set_authorized(sw, val); + + return ret ? ret : count; +} +static DEVICE_ATTR_RW(authorized); + static ssize_t device_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -328,6 +400,54 @@ device_name_show(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR_RO(device_name); +static ssize_t key_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + ssize_t ret; + + if (mutex_lock_interruptible(&switch_lock)) + return -ERESTARTSYS; + + if (sw->key) + ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key); + else + ret = sprintf(buf, "\n"); + + mutex_unlock(&switch_lock); + return ret; +} + +static ssize_t key_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tb_switch *sw = tb_to_switch(dev); + u8 key[TB_SWITCH_KEY_SIZE]; + ssize_t ret = count; + + if (count < 64) + return -EINVAL; + + if (hex2bin(key, buf, sizeof(key))) + return -EINVAL; + + if (mutex_lock_interruptible(&switch_lock)) + return -ERESTARTSYS; + + if (sw->authorized) { + ret = -EBUSY; + } else { + kfree(sw->key); + sw->key = kmemdup(key, sizeof(key), GFP_KERNEL); + if (!sw->key) + ret = -ENOMEM; + } + + mutex_unlock(&switch_lock); + return ret; +} +static DEVICE_ATTR_RW(key); + static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -356,15 +476,35 @@ static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR_RO(unique_id); static struct attribute *switch_attrs[] = { + &dev_attr_authorized.attr, &dev_attr_device.attr, &dev_attr_device_name.attr, + &dev_attr_key.attr, &dev_attr_vendor.attr, &dev_attr_vendor_name.attr, &dev_attr_unique_id.attr, NULL, }; +static umode_t switch_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct tb_switch *sw = tb_to_switch(dev); + + if (attr == &dev_attr_key.attr) { + if (tb_route(sw) && + sw->tb->security_level == TB_SECURITY_SECURE && + sw->security_level == TB_SECURITY_SECURE) + return attr->mode; + return 0; + } + + return attr->mode; +} + static struct attribute_group switch_group = { + .is_visible = switch_attr_is_visible, .attrs = switch_attrs, }; @@ -384,6 +524,7 @@ static void tb_switch_release(struct device *dev) kfree(sw->vendor_name); kfree(sw->ports); kfree(sw->drom); + kfree(sw->key); kfree(sw); } @@ -490,6 +631,10 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, } sw->cap_plug_events = cap; + /* Root switch is always authorized */ + if (!route) + sw->authorized = true; + device_initialize(&sw->dev); sw->dev.parent = parent; sw->dev.bus = &tb_bus_type; @@ -754,3 +899,80 @@ void tb_switch_suspend(struct tb_switch *sw) * effect? */ } + +struct tb_sw_lookup { + struct tb *tb; + u8 link; + u8 depth; + const uuid_be *uuid; +}; + +static int tb_switch_match(struct device *dev, void *data) +{ + struct tb_switch *sw = tb_to_switch(dev); + struct tb_sw_lookup *lookup = data; + + if (!sw) + return 0; + if (sw->tb != lookup->tb) + return 0; + + if (lookup->uuid) + return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid)); + + /* Root switch is matched only by depth */ + if (!lookup->depth) + return !sw->depth; + + return sw->link == lookup->link && sw->depth == lookup->depth; +} + +/** + * tb_switch_find_by_link_depth() - Find switch by link and depth + * @tb: Domain the switch belongs + * @link: Link number the switch is connected + * @depth: Depth of the switch in link + * + * Returned switch has reference count increased so the caller needs to + * call tb_switch_put() when done with the switch. + */ +struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth) +{ + struct tb_sw_lookup lookup; + struct device *dev; + + memset(&lookup, 0, sizeof(lookup)); + lookup.tb = tb; + lookup.link = link; + lookup.depth = depth; + + dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match); + if (dev) + return tb_to_switch(dev); + + return NULL; +} + +/** + * tb_switch_find_by_link_depth() - Find switch by UUID + * @tb: Domain the switch belongs + * @uuid: UUID to look for + * + * Returned switch has reference count increased so the caller needs to + * call tb_switch_put() when done with the switch. + */ +struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_be *uuid) +{ + struct tb_sw_lookup lookup; + struct device *dev; + + memset(&lookup, 0, sizeof(lookup)); + lookup.tb = tb; + lookup.uuid = uuid; + + dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match); + if (dev) + return tb_to_switch(dev); + + return NULL; +} diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index ea9de49b5e10..ad2304bad592 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -7,6 +7,7 @@ #include #include #include +#include #include "tb.h" #include "tb_regs.h" @@ -71,6 +72,8 @@ static void tb_scan_port(struct tb_port *port) return; } + sw->authorized = true; + if (tb_switch_add(sw)) { tb_switch_put(sw); return; @@ -443,10 +446,14 @@ struct tb *tb_probe(struct tb_nhi *nhi) struct tb_cm *tcm; struct tb *tb; + if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc.")) + return NULL; + tb = tb_domain_alloc(nhi, sizeof(*tcm)); if (!tb) return NULL; + tb->security_level = TB_SECURITY_NONE; tb->cm_ops = &tb_cm_ops; tcm = tb_priv(tb); diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 31521c531715..a998b3a251d5 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -14,6 +14,24 @@ #include "ctl.h" #include "dma_port.h" +/** + * enum tb_security_level - Thunderbolt security level + * @TB_SECURITY_NONE: No security, legacy mode + * @TB_SECURITY_USER: User approval required at minimum + * @TB_SECURITY_SECURE: One time saved key required at minimum + * @TB_SECURITY_DPONLY: Only tunnel Display port (and USB) + */ +enum tb_security_level { + TB_SECURITY_NONE, + TB_SECURITY_USER, + TB_SECURITY_SECURE, + TB_SECURITY_DPONLY, +}; + +#define TB_SWITCH_KEY_SIZE 32 +/* Each physical port contains 2 links on modern controllers */ +#define TB_SWITCH_LINKS_PER_PHY_PORT 2 + /** * struct tb_switch - a thunderbolt switch * @dev: Device for the switch @@ -33,6 +51,19 @@ * @cap_plug_events: Offset to the plug events capability (%0 if not found) * @is_unplugged: The switch is going away * @drom: DROM of the switch (%NULL if not found) + * @authorized: Whether the switch is authorized by user or policy + * @work: Work used to automatically authorize a switch + * @security_level: Switch supported security level + * @key: Contains the key used to challenge the device or %NULL if not + * supported. Size of the key is %TB_SWITCH_KEY_SIZE. + * @connection_id: Connection ID used with ICM messaging + * @connection_key: Connection key used with ICM messaging + * @link: Root switch link this switch is connected (ICM only) + * @depth: Depth in the chain this switch is connected (ICM only) + * + * When the switch is being added or removed to the domain (other + * switches) you need to have domain lock held. For switch authorization + * internal switch_lock is enough. */ struct tb_switch { struct device dev; @@ -50,6 +81,14 @@ struct tb_switch { int cap_plug_events; bool is_unplugged; u8 *drom; + unsigned int authorized; + struct work_struct work; + enum tb_security_level security_level; + u8 *key; + u8 connection_id; + u8 connection_key; + u8 link; + u8 depth; }; /** @@ -121,19 +160,33 @@ struct tb_path { /** * struct tb_cm_ops - Connection manager specific operations vector + * @driver_ready: Called right after control channel is started. Used by + * ICM to send driver ready message to the firmware. * @start: Starts the domain * @stop: Stops the domain * @suspend_noirq: Connection manager specific suspend_noirq * @resume_noirq: Connection manager specific resume_noirq + * @suspend: Connection manager specific suspend + * @complete: Connection manager specific complete * @handle_event: Handle thunderbolt event + * @approve_switch: Approve switch + * @add_switch_key: Add key to switch + * @challenge_switch_key: Challenge switch using key */ struct tb_cm_ops { + int (*driver_ready)(struct tb *tb); int (*start)(struct tb *tb); void (*stop)(struct tb *tb); int (*suspend_noirq)(struct tb *tb); int (*resume_noirq)(struct tb *tb); + int (*suspend)(struct tb *tb); + void (*complete)(struct tb *tb); void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type, const void *buf, size_t size); + int (*approve_switch)(struct tb *tb, struct tb_switch *sw); + int (*add_switch_key)(struct tb *tb, struct tb_switch *sw); + int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw, + const u8 *challenge, u8 *response); }; /** @@ -147,6 +200,7 @@ struct tb_cm_ops { * @root_switch: Root switch of this domain * @cm_ops: Connection manager specific operations vector * @index: Linux assigned domain number + * @security_level: Current security level * @privdata: Private connection manager specific data */ struct tb { @@ -158,6 +212,7 @@ struct tb { struct tb_switch *root_switch; const struct tb_cm_ops *cm_ops; int index; + enum tb_security_level security_level; unsigned long privdata[0]; }; @@ -188,6 +243,16 @@ static inline u64 tb_route(struct tb_switch *sw) return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo; } +static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw) +{ + u8 port; + + port = route >> (sw->config.depth * 8); + if (WARN_ON(port > sw->config.max_port_number)) + return NULL; + return &sw->ports[port]; +} + static inline int tb_sw_read(struct tb_switch *sw, void *buffer, enum tb_cfg_space space, u32 offset, u32 length) { @@ -266,6 +331,7 @@ static inline int tb_port_write(struct tb_port *port, const void *buffer, #define tb_port_info(port, fmt, arg...) \ __TB_PORT_PRINT(tb_info, port, fmt, ##arg) +struct tb *icm_probe(struct tb_nhi *nhi); struct tb *tb_probe(struct tb_nhi *nhi); extern struct bus_type tb_bus_type; @@ -280,6 +346,11 @@ int tb_domain_add(struct tb *tb); void tb_domain_remove(struct tb *tb); int tb_domain_suspend_noirq(struct tb *tb); int tb_domain_resume_noirq(struct tb *tb); +int tb_domain_suspend(struct tb *tb); +void tb_domain_complete(struct tb *tb); +int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw); +int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw); +int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw); static inline void tb_domain_put(struct tb *tb) { @@ -296,6 +367,14 @@ int tb_switch_resume(struct tb_switch *sw); int tb_switch_reset(struct tb *tb, u64 route); void tb_sw_set_unplugged(struct tb_switch *sw); struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route); +struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, + u8 depth); +struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_be *uuid); + +static inline unsigned int tb_switch_phy_port_from_link(unsigned int link) +{ + return (link - 1) / TB_SWITCH_LINKS_PER_PHY_PORT; +} static inline void tb_switch_put(struct tb_switch *sw) { diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h index 761d56287149..85b6d33c0919 100644 --- a/drivers/thunderbolt/tb_msgs.h +++ b/drivers/thunderbolt/tb_msgs.h @@ -13,6 +13,7 @@ #define _TB_MSGS #include +#include enum tb_cfg_pkg_type { TB_CFG_PKG_READ = 1, @@ -24,6 +25,9 @@ enum tb_cfg_pkg_type { TB_CFG_PKG_XDOMAIN_RESP = 7, TB_CFG_PKG_OVERRIDE = 8, TB_CFG_PKG_RESET = 9, + TB_CFG_PKG_ICM_EVENT = 10, + TB_CFG_PKG_ICM_CMD = 11, + TB_CFG_PKG_ICM_RESP = 12, TB_CFG_PKG_PREPARE_TO_SLEEP = 0xd, }; @@ -105,4 +109,152 @@ struct cfg_pts_pkg { u32 data; } __packed; +/* ICM messages */ + +enum icm_pkg_code { + ICM_GET_TOPOLOGY = 0x1, + ICM_DRIVER_READY = 0x3, + ICM_APPROVE_DEVICE = 0x4, + ICM_CHALLENGE_DEVICE = 0x5, + ICM_ADD_DEVICE_KEY = 0x6, + ICM_GET_ROUTE = 0xa, +}; + +enum icm_event_code { + ICM_EVENT_DEVICE_CONNECTED = 3, + ICM_EVENT_DEVICE_DISCONNECTED = 4, +}; + +struct icm_pkg_header { + u8 code; + u8 flags; + u8 packet_id; + u8 total_packets; +} __packed; + +#define ICM_FLAGS_ERROR BIT(0) +#define ICM_FLAGS_NO_KEY BIT(1) +#define ICM_FLAGS_SLEVEL_SHIFT 3 +#define ICM_FLAGS_SLEVEL_MASK GENMASK(4, 3) + +struct icm_pkg_driver_ready { + struct icm_pkg_header hdr; +} __packed; + +struct icm_pkg_driver_ready_response { + struct icm_pkg_header hdr; + u8 romver; + u8 ramver; + u16 security_level; +} __packed; + +/* Falcon Ridge & Alpine Ridge common messages */ + +struct icm_fr_pkg_get_topology { + struct icm_pkg_header hdr; +} __packed; + +#define ICM_GET_TOPOLOGY_PACKETS 14 + +struct icm_fr_pkg_get_topology_response { + struct icm_pkg_header hdr; + u32 route_lo; + u32 route_hi; + u8 first_data; + u8 second_data; + u8 drom_i2c_address_index; + u8 switch_index; + u32 reserved[2]; + u32 ports[16]; + u32 port_hop_info[16]; +} __packed; + +#define ICM_SWITCH_USED BIT(0) +#define ICM_SWITCH_UPSTREAM_PORT_MASK GENMASK(7, 1) +#define ICM_SWITCH_UPSTREAM_PORT_SHIFT 1 + +#define ICM_PORT_TYPE_MASK GENMASK(23, 0) +#define ICM_PORT_INDEX_SHIFT 24 +#define ICM_PORT_INDEX_MASK GENMASK(31, 24) + +struct icm_fr_event_device_connected { + struct icm_pkg_header hdr; + uuid_be ep_uuid; + u8 connection_key; + u8 connection_id; + u16 link_info; + u32 ep_name[55]; +} __packed; + +#define ICM_LINK_INFO_LINK_MASK 0x7 +#define ICM_LINK_INFO_DEPTH_SHIFT 4 +#define ICM_LINK_INFO_DEPTH_MASK GENMASK(7, 4) +#define ICM_LINK_INFO_APPROVED BIT(8) + +struct icm_fr_pkg_approve_device { + struct icm_pkg_header hdr; + uuid_be ep_uuid; + u8 connection_key; + u8 connection_id; + u16 reserved; +} __packed; + +struct icm_fr_event_device_disconnected { + struct icm_pkg_header hdr; + u16 reserved; + u16 link_info; +} __packed; + +struct icm_fr_pkg_add_device_key { + struct icm_pkg_header hdr; + uuid_be ep_uuid; + u8 connection_key; + u8 connection_id; + u16 reserved; + u32 key[8]; +} __packed; + +struct icm_fr_pkg_add_device_key_response { + struct icm_pkg_header hdr; + uuid_be ep_uuid; + u8 connection_key; + u8 connection_id; + u16 reserved; +} __packed; + +struct icm_fr_pkg_challenge_device { + struct icm_pkg_header hdr; + uuid_be ep_uuid; + u8 connection_key; + u8 connection_id; + u16 reserved; + u32 challenge[8]; +} __packed; + +struct icm_fr_pkg_challenge_device_response { + struct icm_pkg_header hdr; + uuid_be ep_uuid; + u8 connection_key; + u8 connection_id; + u16 reserved; + u32 challenge[8]; + u32 response[8]; +} __packed; + +/* Alpine Ridge only messages */ + +struct icm_ar_pkg_get_route { + struct icm_pkg_header hdr; + u16 reserved; + u16 link_info; +} __packed; + +struct icm_ar_pkg_get_route_response { + struct icm_pkg_header hdr; + u16 reserved; + u16 link_info; + u32 route_hi; + u32 route_lo; +} __packed; + #endif -- cgit v1.2.3 From e6b245ccd524441f462f1ca1fe726123dcedeeee Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:17 +0300 Subject: thunderbolt: Add support for host and device NVM firmware upgrade Starting from Intel Falcon Ridge the NVM firmware can be upgraded by using DMA configuration based mailbox commands. If we detect that the host or device (device support starts from Intel Alpine Ridge) has the DMA configuration based mailbox we expose NVM information to the userspace as two separate Linux NVMem devices: nvm_active and nvm_non_active. The former is read-only portion of the active NVM which firmware upgrade tools can be use to find out suitable NVM image if the device identification strings are not enough. The latter is write-only portion where the new NVM image is to be written by the userspace. It is up to the userspace to find out right NVM image (the kernel does very minimal validation). The ICM firmware itself authenticates the new NVM firmware and fails the operation if it is not what is expected. We also expose two new sysfs files per each switch: nvm_version and nvm_authenticate which can be used to read the active NVM version and start the upgrade process. We also introduce safe mode which is the mode a switch goes when it does not have properly authenticated firmware. In this mode the switch only accepts a couple of commands including flashing a new NVM firmware image and triggering power cycle. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: Michael Jamet Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-bus-thunderbolt | 26 + drivers/thunderbolt/Kconfig | 1 + drivers/thunderbolt/domain.c | 18 + drivers/thunderbolt/icm.c | 33 +- drivers/thunderbolt/nhi.h | 1 + drivers/thunderbolt/switch.c | 603 +++++++++++++++++++++++- drivers/thunderbolt/tb.c | 7 + drivers/thunderbolt/tb.h | 40 +- 8 files changed, 706 insertions(+), 23 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt index 05b7f9a6431f..2a98149943ea 100644 --- a/Documentation/ABI/testing/sysfs-bus-thunderbolt +++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt @@ -82,3 +82,29 @@ Description: This attribute contains unique_id string of this device. This is either read from hardware registers (UUID on newer hardware) or based on UID from the device DROM. Can be used to uniquely identify particular device. + +What: /sys/bus/thunderbolt/devices/.../nvm_version +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: If the device has upgradeable firmware the version + number is available here. Format: %x.%x, major.minor. + If the device is in safe mode reading the file returns + -ENODATA instead as the NVM version is not available. + +What: /sys/bus/thunderbolt/devices/.../nvm_authenticate +Date: Sep 2017 +KernelVersion: 4.13 +Contact: thunderbolt-software@lists.01.org +Description: When new NVM image is written to the non-active NVM + area (through non_activeX NVMem device), the + authentication procedure is started by writing 1 to + this file. If everything goes well, the device is + restarted with the new NVM firmware. If the image + verification fails an error code is returned instead. + + When read holds status of the last authentication + operation if an error occurred during the process. This + is directly the status value from the DMA configuration + based mailbox before the device is power cycled. Writing + 0 here clears the status. diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig index a9cc724985ad..f4869c38c7e4 100644 --- a/drivers/thunderbolt/Kconfig +++ b/drivers/thunderbolt/Kconfig @@ -6,6 +6,7 @@ menuconfig THUNDERBOLT select CRC32 select CRYPTO select CRYPTO_HASH + select NVMEM help Thunderbolt Controller driver. This driver is required if you want to hotplug Thunderbolt devices on Apple hardware or on PCs diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c index f71b63e90016..9f2dcd48974d 100644 --- a/drivers/thunderbolt/domain.c +++ b/drivers/thunderbolt/domain.c @@ -426,6 +426,23 @@ err_free_tfm: return ret; } +/** + * tb_domain_disconnect_pcie_paths() - Disconnect all PCIe paths + * @tb: Domain whose PCIe paths to disconnect + * + * This needs to be called in preparation for NVM upgrade of the host + * controller. Makes sure all PCIe paths are disconnected. + * + * Return %0 on success and negative errno in case of error. + */ +int tb_domain_disconnect_pcie_paths(struct tb *tb) +{ + if (!tb->cm_ops->disconnect_pcie_paths) + return -EPERM; + + return tb->cm_ops->disconnect_pcie_paths(tb); +} + int tb_domain_init(void) { return bus_register(&tb_bus_type); @@ -435,4 +452,5 @@ void tb_domain_exit(void) { bus_unregister(&tb_bus_type); ida_destroy(&tb_domain_ida); + tb_switch_exit(); } diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c index 0ffa4ec249ac..8ee340290219 100644 --- a/drivers/thunderbolt/icm.c +++ b/drivers/thunderbolt/icm.c @@ -54,6 +54,7 @@ * where ICM needs to be started manually * @vnd_cap: Vendor defined capability where PCIe2CIO mailbox resides * (only set when @upstream_port is not %NULL) + * @safe_mode: ICM is in safe mode * @is_supported: Checks if we can support ICM on this controller * @get_mode: Read and return the ICM firmware mode (optional) * @get_route: Find a route string for given switch @@ -65,6 +66,7 @@ struct icm { struct delayed_work rescan_work; struct pci_dev *upstream_port; int vnd_cap; + bool safe_mode; bool (*is_supported)(struct tb *tb); int (*get_mode)(struct tb *tb); int (*get_route)(struct tb *tb, u8 link, u8 depth, u64 *route); @@ -852,6 +854,10 @@ static int icm_firmware_init(struct tb *tb) ret = icm->get_mode(tb); switch (ret) { + case NHI_FW_SAFE_MODE: + icm->safe_mode = true; + break; + case NHI_FW_CM_MODE: /* Ask ICM to accept all Thunderbolt devices */ nhi_mailbox_cmd(nhi, NHI_MAILBOX_ALLOW_ALL_DEVS, 0); @@ -879,12 +885,20 @@ static int icm_firmware_init(struct tb *tb) static int icm_driver_ready(struct tb *tb) { + struct icm *icm = tb_priv(tb); int ret; ret = icm_firmware_init(tb); if (ret) return ret; + if (icm->safe_mode) { + tb_info(tb, "Thunderbolt host controller is in safe mode.\n"); + tb_info(tb, "You need to update NVM firmware of the controller before it can be used.\n"); + tb_info(tb, "For latest updates check https://thunderbolttechnology.net/updates.\n"); + return 0; + } + return __icm_driver_ready(tb, &tb->security_level); } @@ -975,12 +989,23 @@ static void icm_complete(struct tb *tb) static int icm_start(struct tb *tb) { + struct icm *icm = tb_priv(tb); int ret; - tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); + if (icm->safe_mode) + tb->root_switch = tb_switch_alloc_safe_mode(tb, &tb->dev, 0); + else + tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); if (!tb->root_switch) return -ENODEV; + /* + * NVM upgrade has not been tested on Apple systems and they + * don't provide images publicly either. To be on the safe side + * prevent root switch NVM upgrade on Macs for now. + */ + tb->root_switch->no_nvm_upgrade = is_apple(); + ret = tb_switch_add(tb->root_switch); if (ret) tb_switch_put(tb->root_switch); @@ -998,6 +1023,11 @@ static void icm_stop(struct tb *tb) nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DRV_UNLOADS, 0); } +static int icm_disconnect_pcie_paths(struct tb *tb) +{ + return nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DISCONNECT_PCIE_PATHS, 0); +} + /* Falcon Ridge and Alpine Ridge */ static const struct tb_cm_ops icm_fr_ops = { .driver_ready = icm_driver_ready, @@ -1009,6 +1039,7 @@ static const struct tb_cm_ops icm_fr_ops = { .approve_switch = icm_fr_approve_switch, .add_switch_key = icm_fr_add_switch_key, .challenge_switch_key = icm_fr_challenge_switch_key, + .disconnect_pcie_paths = icm_disconnect_pcie_paths, }; struct tb *icm_probe(struct tb_nhi *nhi) diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h index 953864ae0ab3..5b5bb2c436be 100644 --- a/drivers/thunderbolt/nhi.h +++ b/drivers/thunderbolt/nhi.h @@ -155,6 +155,7 @@ enum nhi_fw_mode { enum nhi_mailbox_cmd { NHI_MAILBOX_SAVE_DEVS = 0x05, + NHI_MAILBOX_DISCONNECT_PCIE_PATHS = 0x06, NHI_MAILBOX_DRV_UNLOADS = 0x07, NHI_MAILBOX_ALLOW_ALL_DEVS = 0x23, }; diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 1524edf42ee8..ab3e8f410444 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -5,13 +5,395 @@ */ #include +#include +#include +#include #include +#include #include "tb.h" /* Switch authorization from userspace is serialized by this lock */ static DEFINE_MUTEX(switch_lock); +/* Switch NVM support */ + +#define NVM_DEVID 0x05 +#define NVM_VERSION 0x08 +#define NVM_CSS 0x10 +#define NVM_FLASH_SIZE 0x45 + +#define NVM_MIN_SIZE SZ_32K +#define NVM_MAX_SIZE SZ_512K + +static DEFINE_IDA(nvm_ida); + +struct nvm_auth_status { + struct list_head list; + uuid_be uuid; + u32 status; +}; + +/* + * Hold NVM authentication failure status per switch This information + * needs to stay around even when the switch gets power cycled so we + * keep it separately. + */ +static LIST_HEAD(nvm_auth_status_cache); +static DEFINE_MUTEX(nvm_auth_status_lock); + +static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw) +{ + struct nvm_auth_status *st; + + list_for_each_entry(st, &nvm_auth_status_cache, list) { + if (!uuid_be_cmp(st->uuid, *sw->uuid)) + return st; + } + + return NULL; +} + +static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status) +{ + struct nvm_auth_status *st; + + mutex_lock(&nvm_auth_status_lock); + st = __nvm_get_auth_status(sw); + mutex_unlock(&nvm_auth_status_lock); + + *status = st ? st->status : 0; +} + +static void nvm_set_auth_status(const struct tb_switch *sw, u32 status) +{ + struct nvm_auth_status *st; + + if (WARN_ON(!sw->uuid)) + return; + + mutex_lock(&nvm_auth_status_lock); + st = __nvm_get_auth_status(sw); + + if (!st) { + st = kzalloc(sizeof(*st), GFP_KERNEL); + if (!st) + goto unlock; + + memcpy(&st->uuid, sw->uuid, sizeof(st->uuid)); + INIT_LIST_HEAD(&st->list); + list_add_tail(&st->list, &nvm_auth_status_cache); + } + + st->status = status; +unlock: + mutex_unlock(&nvm_auth_status_lock); +} + +static void nvm_clear_auth_status(const struct tb_switch *sw) +{ + struct nvm_auth_status *st; + + mutex_lock(&nvm_auth_status_lock); + st = __nvm_get_auth_status(sw); + if (st) { + list_del(&st->list); + kfree(st); + } + mutex_unlock(&nvm_auth_status_lock); +} + +static int nvm_validate_and_write(struct tb_switch *sw) +{ + unsigned int image_size, hdr_size; + const u8 *buf = sw->nvm->buf; + u16 ds_size; + int ret; + + if (!buf) + return -EINVAL; + + image_size = sw->nvm->buf_data_size; + if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE) + return -EINVAL; + + /* + * FARB pointer must point inside the image and must at least + * contain parts of the digital section we will be reading here. + */ + hdr_size = (*(u32 *)buf) & 0xffffff; + if (hdr_size + NVM_DEVID + 2 >= image_size) + return -EINVAL; + + /* Digital section start should be aligned to 4k page */ + if (!IS_ALIGNED(hdr_size, SZ_4K)) + return -EINVAL; + + /* + * Read digital section size and check that it also fits inside + * the image. + */ + ds_size = *(u16 *)(buf + hdr_size); + if (ds_size >= image_size) + return -EINVAL; + + if (!sw->safe_mode) { + u16 device_id; + + /* + * Make sure the device ID in the image matches the one + * we read from the switch config space. + */ + device_id = *(u16 *)(buf + hdr_size + NVM_DEVID); + if (device_id != sw->config.device_id) + return -EINVAL; + + if (sw->generation < 3) { + /* Write CSS headers first */ + ret = dma_port_flash_write(sw->dma_port, + DMA_PORT_CSS_ADDRESS, buf + NVM_CSS, + DMA_PORT_CSS_MAX_SIZE); + if (ret) + return ret; + } + + /* Skip headers in the image */ + buf += hdr_size; + image_size -= hdr_size; + } + + return dma_port_flash_write(sw->dma_port, 0, buf, image_size); +} + +static int nvm_authenticate_host(struct tb_switch *sw) +{ + int ret; + + /* + * Root switch NVM upgrade requires that we disconnect the + * existing PCIe paths first (in case it is not in safe mode + * already). + */ + if (!sw->safe_mode) { + ret = tb_domain_disconnect_pcie_paths(sw->tb); + if (ret) + return ret; + /* + * The host controller goes away pretty soon after this if + * everything goes well so getting timeout is expected. + */ + ret = dma_port_flash_update_auth(sw->dma_port); + return ret == -ETIMEDOUT ? 0 : ret; + } + + /* + * From safe mode we can get out by just power cycling the + * switch. + */ + dma_port_power_cycle(sw->dma_port); + return 0; +} + +static int nvm_authenticate_device(struct tb_switch *sw) +{ + int ret, retries = 10; + + ret = dma_port_flash_update_auth(sw->dma_port); + if (ret && ret != -ETIMEDOUT) + return ret; + + /* + * Poll here for the authentication status. It takes some time + * for the device to respond (we get timeout for a while). Once + * we get response the device needs to be power cycled in order + * to the new NVM to be taken into use. + */ + do { + u32 status; + + ret = dma_port_flash_update_auth_status(sw->dma_port, &status); + if (ret < 0 && ret != -ETIMEDOUT) + return ret; + if (ret > 0) { + if (status) { + tb_sw_warn(sw, "failed to authenticate NVM\n"); + nvm_set_auth_status(sw, status); + } + + tb_sw_info(sw, "power cycling the switch now\n"); + dma_port_power_cycle(sw->dma_port); + return 0; + } + + msleep(500); + } while (--retries); + + return -ETIMEDOUT; +} + +static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct tb_switch *sw = priv; + + return dma_port_flash_read(sw->dma_port, offset, val, bytes); +} + +static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct tb_switch *sw = priv; + int ret = 0; + + if (mutex_lock_interruptible(&switch_lock)) + return -ERESTARTSYS; + + /* + * Since writing the NVM image might require some special steps, + * for example when CSS headers are written, we cache the image + * locally here and handle the special cases when the user asks + * us to authenticate the image. + */ + if (!sw->nvm->buf) { + sw->nvm->buf = vmalloc(NVM_MAX_SIZE); + if (!sw->nvm->buf) { + ret = -ENOMEM; + goto unlock; + } + } + + sw->nvm->buf_data_size = offset + bytes; + memcpy(sw->nvm->buf + offset, val, bytes); + +unlock: + mutex_unlock(&switch_lock); + + return ret; +} + +static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id, + size_t size, bool active) +{ + struct nvmem_config config; + + memset(&config, 0, sizeof(config)); + + if (active) { + config.name = "nvm_active"; + config.reg_read = tb_switch_nvm_read; + } else { + config.name = "nvm_non_active"; + config.reg_write = tb_switch_nvm_write; + } + + config.id = id; + config.stride = 4; + config.word_size = 4; + config.size = size; + config.dev = &sw->dev; + config.owner = THIS_MODULE; + config.root_only = true; + config.priv = sw; + + return nvmem_register(&config); +} + +static int tb_switch_nvm_add(struct tb_switch *sw) +{ + struct nvmem_device *nvm_dev; + struct tb_switch_nvm *nvm; + u32 val; + int ret; + + if (!sw->dma_port) + return 0; + + nvm = kzalloc(sizeof(*nvm), GFP_KERNEL); + if (!nvm) + return -ENOMEM; + + nvm->id = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL); + + /* + * If the switch is in safe-mode the only accessible portion of + * the NVM is the non-active one where userspace is expected to + * write new functional NVM. + */ + if (!sw->safe_mode) { + u32 nvm_size, hdr_size; + + ret = dma_port_flash_read(sw->dma_port, NVM_FLASH_SIZE, &val, + sizeof(val)); + if (ret) + goto err_ida; + + hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K; + nvm_size = (SZ_1M << (val & 7)) / 8; + nvm_size = (nvm_size - hdr_size) / 2; + + ret = dma_port_flash_read(sw->dma_port, NVM_VERSION, &val, + sizeof(val)); + if (ret) + goto err_ida; + + nvm->major = val >> 16; + nvm->minor = val >> 8; + + nvm_dev = register_nvmem(sw, nvm->id, nvm_size, true); + if (IS_ERR(nvm_dev)) { + ret = PTR_ERR(nvm_dev); + goto err_ida; + } + nvm->active = nvm_dev; + } + + nvm_dev = register_nvmem(sw, nvm->id, NVM_MAX_SIZE, false); + if (IS_ERR(nvm_dev)) { + ret = PTR_ERR(nvm_dev); + goto err_nvm_active; + } + nvm->non_active = nvm_dev; + + mutex_lock(&switch_lock); + sw->nvm = nvm; + mutex_unlock(&switch_lock); + + return 0; + +err_nvm_active: + if (nvm->active) + nvmem_unregister(nvm->active); +err_ida: + ida_simple_remove(&nvm_ida, nvm->id); + kfree(nvm); + + return ret; +} + +static void tb_switch_nvm_remove(struct tb_switch *sw) +{ + struct tb_switch_nvm *nvm; + + mutex_lock(&switch_lock); + nvm = sw->nvm; + sw->nvm = NULL; + mutex_unlock(&switch_lock); + + if (!nvm) + return; + + /* Remove authentication status in case the switch is unplugged */ + if (!nvm->authenticating) + nvm_clear_auth_status(sw); + + nvmem_unregister(nvm->non_active); + if (nvm->active) + nvmem_unregister(nvm->active); + ida_simple_remove(&nvm_ida, nvm->id); + vfree(nvm->buf); + kfree(nvm); +} + /* port utility functions */ static const char *tb_port_type(struct tb_regs_port_header *port) @@ -448,6 +830,83 @@ static ssize_t key_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RW(key); +static ssize_t nvm_authenticate_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + u32 status; + + nvm_get_auth_status(sw, &status); + return sprintf(buf, "%#x\n", status); +} + +static ssize_t nvm_authenticate_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct tb_switch *sw = tb_to_switch(dev); + bool val; + int ret; + + if (mutex_lock_interruptible(&switch_lock)) + return -ERESTARTSYS; + + /* If NVMem devices are not yet added */ + if (!sw->nvm) { + ret = -EAGAIN; + goto exit_unlock; + } + + ret = kstrtobool(buf, &val); + if (ret) + goto exit_unlock; + + /* Always clear the authentication status */ + nvm_clear_auth_status(sw); + + if (val) { + ret = nvm_validate_and_write(sw); + if (ret) + goto exit_unlock; + + sw->nvm->authenticating = true; + + if (!tb_route(sw)) + ret = nvm_authenticate_host(sw); + else + ret = nvm_authenticate_device(sw); + } + +exit_unlock: + mutex_unlock(&switch_lock); + + if (ret) + return ret; + return count; +} +static DEVICE_ATTR_RW(nvm_authenticate); + +static ssize_t nvm_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tb_switch *sw = tb_to_switch(dev); + int ret; + + if (mutex_lock_interruptible(&switch_lock)) + return -ERESTARTSYS; + + if (sw->safe_mode) + ret = -ENODATA; + else if (!sw->nvm) + ret = -EAGAIN; + else + ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor); + + mutex_unlock(&switch_lock); + + return ret; +} +static DEVICE_ATTR_RO(nvm_version); + static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -480,6 +939,8 @@ static struct attribute *switch_attrs[] = { &dev_attr_device.attr, &dev_attr_device_name.attr, &dev_attr_key.attr, + &dev_attr_nvm_authenticate.attr, + &dev_attr_nvm_version.attr, &dev_attr_vendor.attr, &dev_attr_vendor_name.attr, &dev_attr_unique_id.attr, @@ -498,9 +959,14 @@ static umode_t switch_attr_is_visible(struct kobject *kobj, sw->security_level == TB_SECURITY_SECURE) return attr->mode; return 0; + } else if (attr == &dev_attr_nvm_authenticate.attr || + attr == &dev_attr_nvm_version.attr) { + if (sw->dma_port) + return attr->mode; + return 0; } - return attr->mode; + return sw->safe_mode ? 0 : attr->mode; } static struct attribute_group switch_group = { @@ -651,6 +1117,45 @@ err_free_sw_ports: return NULL; } +/** + * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode + * @tb: Pointer to the owning domain + * @parent: Parent device for this switch + * @route: Route string for this switch + * + * This creates a switch in safe mode. This means the switch pretty much + * lacks all capabilities except DMA configuration port before it is + * flashed with a valid NVM firmware. + * + * The returned switch must be released by calling tb_switch_put(). + * + * Return: Pointer to the allocated switch or %NULL in case of failure + */ +struct tb_switch * +tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route) +{ + struct tb_switch *sw; + + sw = kzalloc(sizeof(*sw), GFP_KERNEL); + if (!sw) + return NULL; + + sw->tb = tb; + sw->config.depth = tb_route_length(route); + sw->config.route_hi = upper_32_bits(route); + sw->config.route_lo = lower_32_bits(route); + sw->safe_mode = true; + + device_initialize(&sw->dev); + sw->dev.parent = parent; + sw->dev.bus = &tb_bus_type; + sw->dev.type = &tb_switch_type; + sw->dev.groups = switch_groups; + dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw)); + + return sw; +} + /** * tb_switch_configure() - Uploads configuration to the switch * @sw: Switch to configure @@ -717,8 +1222,11 @@ static void tb_switch_set_uuid(struct tb_switch *sw) sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); } -static void tb_switch_add_dma_port(struct tb_switch *sw) +static int tb_switch_add_dma_port(struct tb_switch *sw) { + u32 status; + int ret; + switch (sw->generation) { case 3: break; @@ -726,14 +1234,49 @@ static void tb_switch_add_dma_port(struct tb_switch *sw) case 2: /* Only root switch can be upgraded */ if (tb_route(sw)) - return; + return 0; break; default: - return; + /* + * DMA port is the only thing available when the switch + * is in safe mode. + */ + if (!sw->safe_mode) + return 0; + break; } + if (sw->no_nvm_upgrade) + return 0; + sw->dma_port = dma_port_alloc(sw); + if (!sw->dma_port) + return 0; + + /* + * Check status of the previous flash authentication. If there + * is one we need to power cycle the switch in any case to make + * it functional again. + */ + ret = dma_port_flash_update_auth_status(sw->dma_port, &status); + if (ret <= 0) + return ret; + + if (status) { + tb_sw_info(sw, "switch flash authentication failed\n"); + tb_switch_set_uuid(sw); + nvm_set_auth_status(sw, status); + } + + tb_sw_info(sw, "power cycling the switch now\n"); + dma_port_power_cycle(sw->dma_port); + + /* + * We return error here which causes the switch adding failure. + * It should appear back after power cycle is complete. + */ + return -ESHUTDOWN; } /** @@ -759,29 +1302,41 @@ int tb_switch_add(struct tb_switch *sw) * to the userspace. NVM can be accessed through DMA * configuration based mailbox. */ - tb_switch_add_dma_port(sw); - - /* read drom */ - ret = tb_drom_read(sw); - if (ret) { - tb_sw_warn(sw, "tb_eeprom_read_rom failed\n"); + ret = tb_switch_add_dma_port(sw); + if (ret) return ret; - } - tb_sw_info(sw, "uid: %#llx\n", sw->uid); - tb_switch_set_uuid(sw); + if (!sw->safe_mode) { + /* read drom */ + ret = tb_drom_read(sw); + if (ret) { + tb_sw_warn(sw, "tb_eeprom_read_rom failed\n"); + return ret; + } + tb_sw_info(sw, "uid: %#llx\n", sw->uid); - for (i = 0; i <= sw->config.max_port_number; i++) { - if (sw->ports[i].disabled) { - tb_port_info(&sw->ports[i], "disabled by eeprom\n"); - continue; + tb_switch_set_uuid(sw); + + for (i = 0; i <= sw->config.max_port_number; i++) { + if (sw->ports[i].disabled) { + tb_port_info(&sw->ports[i], "disabled by eeprom\n"); + continue; + } + ret = tb_init_port(&sw->ports[i]); + if (ret) + return ret; } - ret = tb_init_port(&sw->ports[i]); - if (ret) - return ret; } - return device_add(&sw->dev); + ret = device_add(&sw->dev); + if (ret) + return ret; + + ret = tb_switch_nvm_add(sw); + if (ret) + device_del(&sw->dev); + + return ret; } /** @@ -808,6 +1363,7 @@ void tb_switch_remove(struct tb_switch *sw) if (!sw->is_unplugged) tb_plug_events_active(sw, false); + tb_switch_nvm_remove(sw); device_unregister(&sw->dev); } @@ -976,3 +1532,8 @@ struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_be *uuid) return NULL; } + +void tb_switch_exit(void) +{ + ida_destroy(&nvm_ida); +} diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index ad2304bad592..1b02ca0b6129 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -369,6 +369,13 @@ static int tb_start(struct tb *tb) if (!tb->root_switch) return -ENOMEM; + /* + * ICM firmware upgrade needs running firmware and in native + * mode that is not available so disable firmware upgrade of the + * root switch. + */ + tb->root_switch->no_nvm_upgrade = true; + ret = tb_switch_configure(tb->root_switch); if (ret) { tb_switch_put(tb->root_switch); diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index a998b3a251d5..3d9f64676e58 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -7,6 +7,7 @@ #ifndef TB_H_ #define TB_H_ +#include #include #include @@ -14,6 +15,30 @@ #include "ctl.h" #include "dma_port.h" +/** + * struct tb_switch_nvm - Structure holding switch NVM information + * @major: Major version number of the active NVM portion + * @minor: Minor version number of the active NVM portion + * @id: Identifier used with both NVM portions + * @active: Active portion NVMem device + * @non_active: Non-active portion NVMem device + * @buf: Buffer where the NVM image is stored before it is written to + * the actual NVM flash device + * @buf_data_size: Number of bytes actually consumed by the new NVM + * image + * @authenticating: The switch is authenticating the new NVM + */ +struct tb_switch_nvm { + u8 major; + u8 minor; + int id; + struct nvmem_device *active; + struct nvmem_device *non_active; + void *buf; + size_t buf_data_size; + bool authenticating; +}; + /** * enum tb_security_level - Thunderbolt security level * @TB_SECURITY_NONE: No security, legacy mode @@ -39,7 +64,8 @@ enum tb_security_level { * @ports: Ports in this switch * @dma_port: If the switch has port supporting DMA configuration based * mailbox this will hold the pointer to that (%NULL - * otherwise). + * otherwise). If set it also means the switch has + * upgradeable NVM. * @tb: Pointer to the domain the switch belongs to * @uid: Unique ID of the switch * @uuid: UUID of the switch (or %NULL if not supported) @@ -51,6 +77,9 @@ enum tb_security_level { * @cap_plug_events: Offset to the plug events capability (%0 if not found) * @is_unplugged: The switch is going away * @drom: DROM of the switch (%NULL if not found) + * @nvm: Pointer to the NVM if the switch has one (%NULL otherwise) + * @no_nvm_upgrade: Prevent NVM upgrade of this switch + * @safe_mode: The switch is in safe-mode * @authorized: Whether the switch is authorized by user or policy * @work: Work used to automatically authorize a switch * @security_level: Switch supported security level @@ -81,6 +110,9 @@ struct tb_switch { int cap_plug_events; bool is_unplugged; u8 *drom; + struct tb_switch_nvm *nvm; + bool no_nvm_upgrade; + bool safe_mode; unsigned int authorized; struct work_struct work; enum tb_security_level security_level; @@ -172,6 +204,7 @@ struct tb_path { * @approve_switch: Approve switch * @add_switch_key: Add key to switch * @challenge_switch_key: Challenge switch using key + * @disconnect_pcie_paths: Disconnects PCIe paths before NVM update */ struct tb_cm_ops { int (*driver_ready)(struct tb *tb); @@ -187,6 +220,7 @@ struct tb_cm_ops { int (*add_switch_key)(struct tb *tb, struct tb_switch *sw); int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw, const u8 *challenge, u8 *response); + int (*disconnect_pcie_paths)(struct tb *tb); }; /** @@ -340,6 +374,7 @@ extern struct device_type tb_switch_type; int tb_domain_init(void); void tb_domain_exit(void); +void tb_switch_exit(void); struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize); int tb_domain_add(struct tb *tb); @@ -351,6 +386,7 @@ void tb_domain_complete(struct tb *tb); int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw); int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw); int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw); +int tb_domain_disconnect_pcie_paths(struct tb *tb); static inline void tb_domain_put(struct tb *tb) { @@ -359,6 +395,8 @@ static inline void tb_domain_put(struct tb *tb) struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, u64 route); +struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb, + struct device *parent, u64 route); int tb_switch_configure(struct tb_switch *sw); int tb_switch_add(struct tb_switch *sw); void tb_switch_remove(struct tb_switch *sw); -- cgit v1.2.3 From 163f1511520386c74a86a2ce2b1dbef07a227713 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:18 +0300 Subject: thunderbolt: Add documentation how Thunderbolt bus can be used Since there are no such tool yet that handles all the low-level details of connecting devices and upgrading their firmware, add a small document that shows how the Thunderbolt bus can be used directly from command line. Signed-off-by: Mika Westerberg Reviewed-by: Yehezkel Bernat Reviewed-by: Michael Jamet Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/index.rst | 1 + Documentation/admin-guide/thunderbolt.rst | 199 ++++++++++++++++++++++++++++++ 2 files changed, 200 insertions(+) create mode 100644 Documentation/admin-guide/thunderbolt.rst diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst index 8c60a8a32a1a..6d99a7ce6e21 100644 --- a/Documentation/admin-guide/index.rst +++ b/Documentation/admin-guide/index.rst @@ -61,6 +61,7 @@ configure specific aspects of kernel behavior to your liking. java ras pm/index + thunderbolt .. only:: subproject and html diff --git a/Documentation/admin-guide/thunderbolt.rst b/Documentation/admin-guide/thunderbolt.rst new file mode 100644 index 000000000000..6a4cd1f159ca --- /dev/null +++ b/Documentation/admin-guide/thunderbolt.rst @@ -0,0 +1,199 @@ +============= + Thunderbolt +============= +The interface presented here is not meant for end users. Instead there +should be a userspace tool that handles all the low-level details, keeps +database of the authorized devices and prompts user for new connections. + +More details about the sysfs interface for Thunderbolt devices can be +found in ``Documentation/ABI/testing/sysfs-bus-thunderbolt``. + +Those users who just want to connect any device without any sort of +manual work, can add following line to +``/etc/udev/rules.d/99-local.rules``:: + + ACTION=="add", SUBSYSTEM=="thunderbolt", ATTR{authorized}=="0", ATTR{authorized}="1" + +This will authorize all devices automatically when they appear. However, +keep in mind that this bypasses the security levels and makes the system +vulnerable to DMA attacks. + +Security levels and how to use them +----------------------------------- +Starting from Intel Falcon Ridge Thunderbolt controller there are 4 +security levels available. The reason for these is the fact that the +connected devices can be DMA masters and thus read contents of the host +memory without CPU and OS knowing about it. There are ways to prevent +this by setting up an IOMMU but it is not always available for various +reasons. + +The security levels are as follows: + + none + All devices are automatically connected by the firmware. No user + approval is needed. In BIOS settings this is typically called + *Legacy mode*. + + user + User is asked whether the device is allowed to be connected. + Based on the device identification information available through + ``/sys/bus/thunderbolt/devices``. user then can do the decision. + In BIOS settings this is typically called *Unique ID*. + + secure + User is asked whether the device is allowed to be connected. In + addition to UUID the device (if it supports secure connect) is sent + a challenge that should match the expected one based on a random key + written to ``key`` sysfs attribute. In BIOS settings this is + typically called *One time saved key*. + + dponly + The firmware automatically creates tunnels for Display Port and + USB. No PCIe tunneling is done. In BIOS settings this is + typically called *Display Port Only*. + +The current security level can be read from +``/sys/bus/thunderbolt/devices/domainX/security`` where ``domainX`` is +the Thunderbolt domain the host controller manages. There is typically +one domain per Thunderbolt host controller. + +If the security level reads as ``user`` or ``secure`` the connected +device must be authorized by the user before PCIe tunnels are created +(e.g the PCIe device appears). + +Each Thunderbolt device plugged in will appear in sysfs under +``/sys/bus/thunderbolt/devices``. The device directory carries +information that can be used to identify the particular device, +including its name and UUID. + +Authorizing devices when security level is ``user`` or ``secure`` +----------------------------------------------------------------- +When a device is plugged in it will appear in sysfs as follows:: + + /sys/bus/thunderbolt/devices/0-1/authorized - 0 + /sys/bus/thunderbolt/devices/0-1/device - 0x8004 + /sys/bus/thunderbolt/devices/0-1/device_name - Thunderbolt to FireWire Adapter + /sys/bus/thunderbolt/devices/0-1/vendor - 0x1 + /sys/bus/thunderbolt/devices/0-1/vendor_name - Apple, Inc. + /sys/bus/thunderbolt/devices/0-1/unique_id - e0376f00-0300-0100-ffff-ffffffffffff + +The ``authorized`` attribute reads 0 which means no PCIe tunnels are +created yet. The user can authorize the device by simply:: + + # echo 1 > /sys/bus/thunderbolt/devices/0-1/authorized + +This will create the PCIe tunnels and the device is now connected. + +If the device supports secure connect, and the domain security level is +set to ``secure``, it has an additional attribute ``key`` which can hold +a random 32 byte value used for authorization and challenging the device in +future connects:: + + /sys/bus/thunderbolt/devices/0-3/authorized - 0 + /sys/bus/thunderbolt/devices/0-3/device - 0x305 + /sys/bus/thunderbolt/devices/0-3/device_name - AKiTiO Thunder3 PCIe Box + /sys/bus/thunderbolt/devices/0-3/key - + /sys/bus/thunderbolt/devices/0-3/vendor - 0x41 + /sys/bus/thunderbolt/devices/0-3/vendor_name - inXtron + /sys/bus/thunderbolt/devices/0-3/unique_id - dc010000-0000-8508-a22d-32ca6421cb16 + +Notice the key is empty by default. + +If the user does not want to use secure connect it can just ``echo 1`` +to the ``authorized`` attribute and the PCIe tunnels will be created in +the same way than in ``user`` security level. + +If the user wants to use secure connect, the first time the device is +plugged a key needs to be created and send to the device:: + + # key=$(openssl rand -hex 32) + # echo $key > /sys/bus/thunderbolt/devices/0-3/key + # echo 1 > /sys/bus/thunderbolt/devices/0-3/authorized + +Now the device is connected (PCIe tunnels are created) and in addition +the key is stored on the device NVM. + +Next time the device is plugged in the user can verify (challenge) the +device using the same key:: + + # echo $key > /sys/bus/thunderbolt/devices/0-3/key + # echo 2 > /sys/bus/thunderbolt/devices/0-3/authorized + +If the challenge the device returns back matches the one we expect based +on the key, the device is connected and the PCIe tunnels are created. +However, if the challenge failed no tunnels are created and error is +returned to the user. + +If the user still wants to connect the device it can either approve +the device without a key or write new key and write 1 to the +``authorized`` file to get the new key stored on the device NVM. + +Upgrading NVM on Thunderbolt device or host +------------------------------------------- +Since most of the functionality is handled in a firmware running on a +host controller or a device, it is important that the firmware can be +upgraded to the latest where possible bugs in it have been fixed. +Typically OEMs provide this firmware from their support site. + +There is also a central site which has links where to download firmwares +for some machines: + + `Thunderbolt Updates `_ + +Before you upgrade firmware on a device or host, please make sure it is +the suitable. Failing to do that may render the device (or host) in a +state where it cannot be used properly anymore without special tools! + +Host NVM upgrade on Apple Macs is not supported. + +Once the NVM image has been downloaded, you need to plug in a +Thunderbolt device so that the host controller appears. It does not +matter which device is connected (unless you are upgrading NVM on a +device - then you need to connect that particular device). + +Note OEM-specific method to power the controller up ("force power") may +be available for your system in which case there is no need to plug in a +Thunderbolt device. + +After that we can write the firmware to the non-active parts of the NVM +of the host or device. As an example here is how Intel NUC6i7KYK (Skull +Canyon) Thunderbolt controller NVM is upgraded:: + + # dd if=KYK_TBT_FW_0018.bin of=/sys/bus/thunderbolt/devices/0-0/nvm_non_active0/nvmem + +Once the operation completes we can trigger NVM authentication and +upgrade process as follows:: + + # echo 1 > /sys/bus/thunderbolt/devices/0-0/nvm_authenticate + +If no errors are returned, the host controller shortly disappears. Once +it comes back the driver notices it and initiates a full power cycle. +After a while the host controller appears again and this time it should +be fully functional. + +We can verify that the new NVM firmware is active by running following +commands:: + + # cat /sys/bus/thunderbolt/devices/0-0/nvm_authenticate + 0x0 + # cat /sys/bus/thunderbolt/devices/0-0/nvm_version + 18.0 + +If ``nvm_authenticate`` contains anything else than 0x0 it is the error +code from the last authentication cycle, which means the authentication +of the NVM image failed. + +Note names of the NVMem devices ``nvm_activeN`` and ``nvm_non_activeN`` +depends on the order they are registered in the NVMem subsystem. N in +the name is the identifier added by the NVMem subsystem. + +Upgrading NVM when host controller is in safe mode +-------------------------------------------------- +If the existing NVM is not properly authenticated (or is missing) the +host controller goes into safe mode which means that only available +functionality is flashing new NVM image. When in this mode the reading +``nvm_version`` fails with ``ENODATA`` and the device identification +information is missing. + +To recover from this mode, one needs to flash a valid NVM image to the +host host controller in the same way it is done in the previous chapter. -- cgit v1.2.3 From a038c0372ee67b326599f214f387aebb67ccf578 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 6 Jun 2017 15:25:19 +0300 Subject: MAINTAINERS: Add maintainers for Thunderbolt driver We will be helping Andreas to maintain the Thunderbolt driver. Signed-off-by: Michael Jamet Signed-off-by: Yehezkel Bernat Signed-off-by: Mika Westerberg Reviewed-by: Andy Shevchenko Signed-off-by: Andreas Noever Signed-off-by: Greg Kroah-Hartman --- MAINTAINERS | 3 +++ 1 file changed, 3 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index e3f44fdb14eb..902066f1c17e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11344,6 +11344,9 @@ F: Documentation/tee.txt THUNDERBOLT DRIVER M: Andreas Noever +M: Michael Jamet +M: Mika Westerberg +M: Yehezkel Bernat S: Maintained F: drivers/thunderbolt/ -- cgit v1.2.3 From eb7bfcce69a9283db76e6d95ce9a9fcd7abc047a Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Thu, 18 May 2017 08:42:49 +0100 Subject: thunderbolt: fix spelling mistake: "missmatch" -> "mismatch" Trivial fix to spelling mistake in tb_sw_warn warning message Signed-off-by: Colin Ian King Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/eeprom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index 996c6e29c8ad..308b6e17c88a 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -291,7 +291,7 @@ int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid) crc = tb_crc8(data + 1, 8); if (crc != data[0]) { - tb_sw_warn(sw, "uid crc8 missmatch (expected: %#x, got: %#x)\n", + tb_sw_warn(sw, "uid crc8 mismatch (expected: %#x, got: %#x)\n", data[0], crc); return -EIO; } -- cgit v1.2.3 From f73f20e1fcc9fcdc7557fd1c4b1b72f924478688 Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Mon, 5 Jun 2017 14:15:02 -0600 Subject: coresight: Disable the path only when the source is disabled With a coresight tracing session, the components along the path from the source to sink are disabled after the source is disabled. However, if the source was not actually disabled due to active users, we should not disable the components in the path. Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 0c37356e417c..532a2acfa8cc 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -253,14 +253,22 @@ static int coresight_enable_source(struct coresight_device *csdev, u32 mode) return 0; } -static void coresight_disable_source(struct coresight_device *csdev) +/** + * coresight_disable_source - Drop the reference count by 1 and disable + * the device if there are no users left. + * + * @csdev - The coresight device to disable + * + * Returns true if the device has been disabled. + */ +static bool coresight_disable_source(struct coresight_device *csdev) { if (atomic_dec_return(csdev->refcnt) == 0) { - if (source_ops(csdev)->disable) { + if (source_ops(csdev)->disable) source_ops(csdev)->disable(csdev, NULL); - csdev->enable = false; - } + csdev->enable = false; } + return !csdev->enable; } void coresight_disable_path(struct list_head *path) @@ -629,7 +637,7 @@ void coresight_disable(struct coresight_device *csdev) if (ret) goto out; - if (!csdev->enable) + if (!csdev->enable || !coresight_disable_source(csdev)) goto out; switch (csdev->subtype.source_subtype) { @@ -647,7 +655,6 @@ void coresight_disable(struct coresight_device *csdev) break; } - coresight_disable_source(csdev); coresight_disable_path(path); coresight_release_path(path); -- cgit v1.2.3 From 022aa1a81b778789ee7cf3124595854276a0330d Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Mon, 5 Jun 2017 14:15:03 -0600 Subject: coresight: Fix reference count for software sources For software sources (i.e STM), there could be multiple agents generating the trace data, unlike the ETMs. So we need to properly do the accounting for the active number of users to disable the device when the last user goes away. Right now, the reference counting is broken for sources as we skip the actions when we detect that the source is enabled. This patch fixes the problem by adding the refcounting for software sources, even when they are enabled. Cc: Mathieu Poirier Reported-by: Robert Walker Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 532a2acfa8cc..6a0202b7384f 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -558,6 +558,9 @@ int coresight_enable(struct coresight_device *csdev) int cpu, ret = 0; struct coresight_device *sink; struct list_head *path; + enum coresight_dev_subtype_source subtype; + + subtype = csdev->subtype.source_subtype; mutex_lock(&coresight_mutex); @@ -565,8 +568,16 @@ int coresight_enable(struct coresight_device *csdev) if (ret) goto out; - if (csdev->enable) + if (csdev->enable) { + /* + * There could be multiple applications driving the software + * source. So keep the refcount for each such user when the + * source is already enabled. + */ + if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) + atomic_inc(csdev->refcnt); goto out; + } /* * Search for a valid sink for this session but don't reset the @@ -593,7 +604,7 @@ int coresight_enable(struct coresight_device *csdev) if (ret) goto err_source; - switch (csdev->subtype.source_subtype) { + switch (subtype) { case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC: /* * When working from sysFS it is important to keep track -- cgit v1.2.3 From d755209f6afddecfb1bb33efebb2a87039959205 Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Mon, 5 Jun 2017 14:15:04 -0600 Subject: coresight: etm_perf: Fix using uninitialised work With 4.11-rc4, the following command triggers a WARN_ON, when a sink is not enabled. perf record -e cs_etm/@20010000.etf/ [88286.547741] ------------[ cut here ]------------ [88286.552332] WARNING: CPU: 3 PID: 2156 at kernel/workqueue.c:1442 __queue_work+0x29c/0x3b8 [88286.560427] Modules linked in: [88286.563451] [88286.564928] CPU: 3 PID: 2156 Comm: perf_v4.11 Not tainted 4.11.0-rc4 #217 [88286.573453] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Aug 15 2016 [88286.584128] task: ffff80097597c200 task.stack: ffff8009768b0000 [88286.589990] PC is at __queue_work+0x29c/0x3b8 [88286.594303] LR is at __queue_work+0x104/0x3b8 [88286.598614] pc : [] lr : [] pstate: a00001c5 [88286.605934] sp : ffff8009768b3aa0 [88286.609212] x29: ffff8009768b3aa0 x28: ffff80097ff3da00 [88286.614477] x27: ffff80097ff89c00 x26: ffff8009751b0e00 [88286.619741] x25: ffff000008c9f000 x24: 0000000000000003 [88286.625004] x23: 0000000000000040 x22: ffff000008d3dab8 [88286.630268] x21: ffff800977804400 x20: 0000000000000007 [88286.635532] x19: ffff000008c54000 x18: 0000fffff9185160 [88286.640795] x17: 0000ffffb33d9a38 x16: ffff000008088270 [88286.646059] x15: 0000ffffb345b590 x14: 0000000000000000 [88286.651322] x13: 0000000000000004 x12: 0000000000000040 [88286.656586] x11: 0000000000000068 x10: 0000000000000000 [88286.661849] x9 : ffff800977400028 x8 : 0000000000000000 [88286.667113] x7 : 0000000000000000 x6 : ffff0000080d8ae4 [88286.672376] x5 : 0000000000000000 x4 : 0000000000000080 [88286.677639] x3 : 0000000000000000 x2 : 0000000000000000 [88286.682903] x1 : 0000000000000000 x0 : ffff8009751b0e08 [88286.688166] [88286.689638] ---[ end trace 31633f18fd33d4cb ]--- [88286.694206] Call trace: [88286.696627] Exception stack(0xffff8009768b38d0 to 0xffff8009768b3a00) [88286.703004] 38c0: ffff000008c54000 0001000000000000 [88286.710757] 38e0: ffff8009768b3aa0 ffff0000080d8c7c ffff8009768b3b50 ffff80097ff8a5b0 [88286.718511] 3900: 0000800977325000 0000000000000000 0000000000000040 ffff80097ffc6180 [88286.726264] 3920: ffff8009768b3940 ffff0000088a8694 ffff80097ffc5800 0000000000000000 [88286.734017] 3940: ffff8009768b3960 ffff0000081919c0 ffff80097ffc5280 0000000000000001 [88286.741771] 3960: ffff8009768b3a50 ffff00000819206c ffff8009751b0e08 0000000000000000 [88286.749523] 3980: 0000000000000000 0000000000000000 0000000000000080 0000000000000000 [88286.757277] 39a0: ffff0000080d8ae4 0000000000000000 0000000000000000 ffff800977400028 [88286.765029] 39c0: 0000000000000000 0000000000000068 0000000000000040 0000000000000004 [88286.772783] 39e0: 0000000000000000 0000ffffb345b590 ffff000008088270 0000ffffb33d9a38 [88286.780537] [] __queue_work+0x29c/0x3b8 [88286.785883] [] queue_work_on+0x60/0x78 [88286.791146] [] etm_setup_aux+0x178/0x238 [88286.796578] [] rb_alloc_aux+0x228/0x310 [88286.801925] [] perf_mmap+0x404/0x5a8 [88286.807015] [] mmap_region+0x394/0x5c0 [88286.812276] [] do_mmap+0x254/0x388 [88286.817191] [] vm_mmap_pgoff+0xbc/0xe0 [88286.822452] [] SyS_mmap_pgoff+0xac/0x228 [88286.827884] [] sys_mmap+0x18/0x28 [88286.832714] [] el0_svc_naked+0x24/0x28 The patch makes sure that the event_data->work is initialised properly before we could possibly use it. Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Tested-by: Mike Leach Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etm-perf.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index 288a423c1b27..8f546f59a3fd 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -201,6 +201,7 @@ static void *etm_setup_aux(int event_cpu, void **pages, event_data = alloc_event_data(event_cpu); if (!event_data) return NULL; + INIT_WORK(&event_data->work, free_event_data); /* * In theory nothing prevent tracers in a trace session from being @@ -217,8 +218,6 @@ static void *etm_setup_aux(int event_cpu, void **pages, if (!sink) goto err; - INIT_WORK(&event_data->work, free_event_data); - mask = &event_data->mask; /* Setup the path for each CPU in a trace session */ -- cgit v1.2.3 From 2cd541402829e7cc6621d2fc0ef329321559cb26 Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:05 -0600 Subject: coresight: tmc: minor fix for output log In current code the output logs are not well symmetric for sink and link enabling and disabling. This patch is to fix that so can output paired logs. Cc: Mathieu Poirier Signed-off-by: Leo Yan Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-tmc-etf.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index aec61a6d5c63..e3b9fb82eb8d 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -166,9 +166,6 @@ out: if (!used) kfree(buf); - if (!ret) - dev_info(drvdata->dev, "TMC-ETB/ETF enabled\n"); - return ret; } @@ -204,15 +201,27 @@ out: static int tmc_enable_etf_sink(struct coresight_device *csdev, u32 mode) { + int ret; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + switch (mode) { case CS_MODE_SYSFS: - return tmc_enable_etf_sink_sysfs(csdev); + ret = tmc_enable_etf_sink_sysfs(csdev); + break; case CS_MODE_PERF: - return tmc_enable_etf_sink_perf(csdev); + ret = tmc_enable_etf_sink_perf(csdev); + break; + /* We shouldn't be here */ + default: + ret = -EINVAL; + break; } - /* We shouldn't be here */ - return -EINVAL; + if (ret) + return ret; + + dev_info(drvdata->dev, "TMC-ETB/ETF enabled\n"); + return 0; } static void tmc_disable_etf_sink(struct coresight_device *csdev) @@ -273,7 +282,7 @@ static void tmc_disable_etf_link(struct coresight_device *csdev, drvdata->mode = CS_MODE_DISABLED; spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "TMC disabled\n"); + dev_info(drvdata->dev, "TMC-ETF disabled\n"); } static void *tmc_alloc_etf_buffer(struct coresight_device *csdev, int cpu, -- cgit v1.2.3 From f42fe520e449bda213f035478ddc9cf99e9082ac Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:06 -0600 Subject: coresight: use const for device_node structures Almost low level functions from open firmware have used const to qualify device_node structures, so add const for device_node parameters in of_coresight related functions. Signed-off-by: Leo Yan Reviewed-by: Stephen Boyd Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/of_coresight.c | 7 ++++--- include/linux/coresight.h | 7 ++++--- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c index 09142e99e915..2749853b9010 100644 --- a/drivers/hwtracing/coresight/of_coresight.c +++ b/drivers/hwtracing/coresight/of_coresight.c @@ -52,7 +52,7 @@ of_coresight_get_endpoint_device(struct device_node *endpoint) endpoint, of_dev_node_match); } -static void of_coresight_get_ports(struct device_node *node, +static void of_coresight_get_ports(const struct device_node *node, int *nr_inport, int *nr_outport) { struct device_node *ep = NULL; @@ -101,8 +101,9 @@ static int of_coresight_alloc_memory(struct device *dev, return 0; } -struct coresight_platform_data *of_get_coresight_platform_data( - struct device *dev, struct device_node *node) +struct coresight_platform_data * +of_get_coresight_platform_data(struct device *dev, + const struct device_node *node) { int i = 0, ret = 0, cpu; struct coresight_platform_data *pdata; diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 035c16c9a505..bf0aa50880be 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -263,11 +263,12 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset, #endif #ifdef CONFIG_OF -extern struct coresight_platform_data *of_get_coresight_platform_data( - struct device *dev, struct device_node *node); +extern struct coresight_platform_data * +of_get_coresight_platform_data(struct device *dev, + const struct device_node *node); #else static inline struct coresight_platform_data *of_get_coresight_platform_data( - struct device *dev, struct device_node *node) { return NULL; } + struct device *dev, const struct device_node *node) { return NULL; } #endif #ifdef CONFIG_PID_NS -- cgit v1.2.3 From 0f9df80ef5f4be1a3abbb161e1469884110a0112 Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Mon, 5 Jun 2017 14:15:07 -0600 Subject: coresight: etb10: Delete an error message for a failed memory allocation in etb_probe() Omit an extra message for a memory allocation failure in this function. This issue was detected by using the Coccinelle software. Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdf Signed-off-by: Markus Elfring Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etb10.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 979ea6ec7902..837aebf22c45 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -675,11 +675,8 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id) drvdata->buf = devm_kzalloc(dev, drvdata->buffer_depth * 4, GFP_KERNEL); - if (!drvdata->buf) { - dev_err(dev, "Failed to allocate %u bytes for buffer data\n", - drvdata->buffer_depth * 4); + if (!drvdata->buf) return -ENOMEM; - } desc.type = CORESIGHT_DEV_TYPE_SINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; -- cgit v1.2.3 From 63a5c022469f0df1c81cd8c117902bc89e0d19be Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Mon, 5 Jun 2017 14:15:08 -0600 Subject: coresight: etb10: Fix a typo in a comment line Delete a character in this description for a condition check. Signed-off-by: Markus Elfring Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etb10.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 837aebf22c45..d5b96423e1a5 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -375,7 +375,7 @@ static void etb_update_buffer(struct coresight_device *csdev, /* * Entries should be aligned to the frame size. If they are not - * go back to the last alignement point to give decoding tools a + * go back to the last alignment point to give decoding tools a * chance to fix things. */ if (write_ptr % ETB_FRAME_SIZE_WORDS) { -- cgit v1.2.3 From a3959c50b02f57df4c4e4f14f632220f1c0b1f79 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Mon, 5 Jun 2017 14:15:09 -0600 Subject: coresight: tmc: Configure DMA mask appropriately Before making any DMA API calls, the ETR driver should really be setting its masks to ensure that DMA is possible. Especially since it can address more than the 32-bit default mask set by the AMBA bus code. Signed-off-by: Robin Murphy Tested-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-tmc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c index d8517d2a968c..864488793f09 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.c +++ b/drivers/hwtracing/coresight/coresight-tmc.c @@ -362,6 +362,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) desc.type = CORESIGHT_DEV_TYPE_SINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; desc.ops = &tmc_etr_cs_ops; + /* + * ETR configuration uses a 40-bit AXI master in place of + * the embedded SRAM of ETB/ETF. + */ + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40)); + if (ret) + goto out; } else { desc.type = CORESIGHT_DEV_TYPE_LINKSINK; desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO; -- cgit v1.2.3 From a70fc83d3c50c5e3c69de66d4b13d8a1fbfbbe73 Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:10 -0600 Subject: coresight: bindings for CPU debug module According to ARMv8 architecture reference manual (ARM DDI 0487A.k) Chapter 'Part H: External debug', the CPU can integrate debug module and it can support self-hosted debug and external debug. Especially for supporting self-hosted debug, this means the program can access the debug module from mmio region; and usually the mmio region is integrated with coresight. So add document for binding debug component, includes binding to APB clock; and also need specify the CPU node which the debug module is dedicated to specific CPU. Suggested-by: Mike Leach Signed-off-by: Leo Yan Reviewed-by: Suzuki K Poulose Acked-by: Rob Herring Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- .../bindings/arm/coresight-cpu-debug.txt | 49 ++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt diff --git a/Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt b/Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt new file mode 100644 index 000000000000..298291211ea4 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt @@ -0,0 +1,49 @@ +* CoreSight CPU Debug Component: + +CoreSight CPU debug component are compliant with the ARMv8 architecture +reference manual (ARM DDI 0487A.k) Chapter 'Part H: External debug'. The +external debug module is mainly used for two modes: self-hosted debug and +external debug, and it can be accessed from mmio region from Coresight +and eventually the debug module connects with CPU for debugging. And the +debug module provides sample-based profiling extension, which can be used +to sample CPU program counter, secure state and exception level, etc; +usually every CPU has one dedicated debug module to be connected. + +Required properties: + +- compatible : should be "arm,coresight-cpu-debug"; supplemented with + "arm,primecell" since this driver is using the AMBA bus + interface. + +- reg : physical base address and length of the register set. + +- clocks : the clock associated to this component. + +- clock-names : the name of the clock referenced by the code. Since we are + using the AMBA framework, the name of the clock providing + the interconnect should be "apb_pclk" and the clock is + mandatory. The interface between the debug logic and the + processor core is clocked by the internal CPU clock, so it + is enabled with CPU clock by default. + +- cpu : the CPU phandle the debug module is affined to. When omitted + the module is considered to belong to CPU0. + +Optional properties: + +- power-domains: a phandle to the debug power domain. We use "power-domains" + binding to turn on the debug logic if it has own dedicated + power domain and if necessary to use "cpuidle.off=1" or + "nohlt" in the kernel command line or sysfs node to + constrain idle states to ensure registers in the CPU power + domain are accessible. + +Example: + + debug@f6590000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf6590000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu0>; + }; -- cgit v1.2.3 From 0cd555c35131eb6318fd0fb17e2fdc8bdd020f8f Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:11 -0600 Subject: doc: Add documentation for Coresight CPU debug Add detailed documentation for Coresight CPU debug driver, which contains the info for driver implementation, Mike Leach excellent summary for "clock and power domain". At the end some examples on how to enable the debugging functionality are provided. Suggested-by: Mike Leach Signed-off-by: Leo Yan Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- Documentation/trace/coresight-cpu-debug.txt | 175 ++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 Documentation/trace/coresight-cpu-debug.txt diff --git a/Documentation/trace/coresight-cpu-debug.txt b/Documentation/trace/coresight-cpu-debug.txt new file mode 100644 index 000000000000..b3da1f90b861 --- /dev/null +++ b/Documentation/trace/coresight-cpu-debug.txt @@ -0,0 +1,175 @@ + Coresight CPU Debug Module + ========================== + + Author: Leo Yan + Date: April 5th, 2017 + +Introduction +------------ + +Coresight CPU debug module is defined in ARMv8-a architecture reference manual +(ARM DDI 0487A.k) Chapter 'Part H: External debug', the CPU can integrate +debug module and it is mainly used for two modes: self-hosted debug and +external debug. Usually the external debug mode is well known as the external +debugger connects with SoC from JTAG port; on the other hand the program can +explore debugging method which rely on self-hosted debug mode, this document +is to focus on this part. + +The debug module provides sample-based profiling extension, which can be used +to sample CPU program counter, secure state and exception level, etc; usually +every CPU has one dedicated debug module to be connected. Based on self-hosted +debug mechanism, Linux kernel can access these related registers from mmio +region when the kernel panic happens. The callback notifier for kernel panic +will dump related registers for every CPU; finally this is good for assistant +analysis for panic. + + +Implementation +-------------- + +- During driver registration, it uses EDDEVID and EDDEVID1 - two device ID + registers to decide if sample-based profiling is implemented or not. On some + platforms this hardware feature is fully or partially implemented; and if + this feature is not supported then registration will fail. + +- At the time this documentation was written, the debug driver mainly relies on + information gathered by the kernel panic callback notifier from three + sampling registers: EDPCSR, EDVIDSR and EDCIDSR: from EDPCSR we can get + program counter; EDVIDSR has information for secure state, exception level, + bit width, etc; EDCIDSR is context ID value which contains the sampled value + of CONTEXTIDR_EL1. + +- The driver supports a CPU running in either AArch64 or AArch32 mode. The + registers naming convention is a bit different between them, AArch64 uses + 'ED' for register prefix (ARM DDI 0487A.k, chapter H9.1) and AArch32 uses + 'DBG' as prefix (ARM DDI 0487A.k, chapter G5.1). The driver is unified to + use AArch64 naming convention. + +- ARMv8-a (ARM DDI 0487A.k) and ARMv7-a (ARM DDI 0406C.b) have different + register bits definition. So the driver consolidates two difference: + + If PCSROffset=0b0000, on ARMv8-a the feature of EDPCSR is not implemented; + but ARMv7-a defines "PCSR samples are offset by a value that depends on the + instruction set state". For ARMv7-a, the driver checks furthermore if CPU + runs with ARM or thumb instruction set and calibrate PCSR value, the + detailed description for offset is in ARMv7-a ARM (ARM DDI 0406C.b) chapter + C11.11.34 "DBGPCSR, Program Counter Sampling Register". + + If PCSROffset=0b0010, ARMv8-a defines "EDPCSR implemented, and samples have + no offset applied and do not sample the instruction set state in AArch32 + state". So on ARMv8 if EDDEVID1.PCSROffset is 0b0010 and the CPU operates + in AArch32 state, EDPCSR is not sampled; when the CPU operates in AArch64 + state EDPCSR is sampled and no offset are applied. + + +Clock and power domain +---------------------- + +Before accessing debug registers, we should ensure the clock and power domain +have been enabled properly. In ARMv8-a ARM (ARM DDI 0487A.k) chapter 'H9.1 +Debug registers', the debug registers are spread into two domains: the debug +domain and the CPU domain. + + +---------------+ + | | + | | + +----------+--+ | + dbg_clock -->| |**| |<-- cpu_clock + | Debug |**| CPU | + dbg_power_domain -->| |**| |<-- cpu_power_domain + +----------+--+ | + | | + | | + +---------------+ + +For debug domain, the user uses DT binding "clocks" and "power-domains" to +specify the corresponding clock source and power supply for the debug logic. +The driver calls the pm_runtime_{put|get} operations as needed to handle the +debug power domain. + +For CPU domain, the different SoC designs have different power management +schemes and finally this heavily impacts external debug module. So we can +divide into below cases: + +- On systems with a sane power controller which can behave correctly with + respect to CPU power domain, the CPU power domain can be controlled by + register EDPRCR in driver. The driver firstly writes bit EDPRCR.COREPURQ + to power up the CPU, and then writes bit EDPRCR.CORENPDRQ for emulation + of CPU power down. As result, this can ensure the CPU power domain is + powered on properly during the period when access debug related registers; + +- Some designs will power down an entire cluster if all CPUs on the cluster + are powered down - including the parts of the debug registers that should + remain powered in the debug power domain. The bits in EDPRCR are not + respected in these cases, so these designs do not support debug over + power down in the way that the CoreSight / Debug designers anticipated. + This means that even checking EDPRSR has the potential to cause a bus hang + if the target register is unpowered. + + In this case, accessing to the debug registers while they are not powered + is a recipe for disaster; so we need preventing CPU low power states at boot + time or when user enable module at the run time. Please see chapter + "How to use the module" for detailed usage info for this. + + +Device Tree Bindings +-------------------- + +See Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt for details. + + +How to use the module +--------------------- + +If you want to enable debugging functionality at boot time, you can add +"coresight_cpu_debug.enable=1" to the kernel command line parameter. + +The driver also can work as module, so can enable the debugging when insmod +module: +# insmod coresight_cpu_debug.ko debug=1 + +When boot time or insmod module you have not enabled the debugging, the driver +uses the debugfs file system to provide a knob to dynamically enable or disable +debugging: + +To enable it, write a '1' into /sys/kernel/debug/coresight_cpu_debug/enable: +# echo 1 > /sys/kernel/debug/coresight_cpu_debug/enable + +To disable it, write a '0' into /sys/kernel/debug/coresight_cpu_debug/enable: +# echo 0 > /sys/kernel/debug/coresight_cpu_debug/enable + +As explained in chapter "Clock and power domain", if you are working on one +platform which has idle states to power off debug logic and the power +controller cannot work well for the request from EDPRCR, then you should +firstly constraint CPU idle states before enable CPU debugging feature; so can +ensure the accessing to debug logic. + +If you want to limit idle states at boot time, you can use "nohlt" or +"cpuidle.off=1" in the kernel command line. + +At the runtime you can disable idle states with below methods: + +Set latency request to /dev/cpu_dma_latency to disable all CPUs specific idle +states (if latency = 0uS then disable all idle states): +# echo "what_ever_latency_you_need_in_uS" > /dev/cpu_dma_latency + +Disable specific CPU's specific idle state: +# echo 1 > /sys/devices/system/cpu/cpu$cpu/cpuidle/state$state/disable + + +Output format +------------- + +Here is an example of the debugging output format: + +ARM external debug module: +coresight-cpu-debug 850000.debug: CPU[0]: +coresight-cpu-debug 850000.debug: EDPRSR: 00000001 (Power:On DLK:Unlock) +coresight-cpu-debug 850000.debug: EDPCSR: [] handle_IPI+0x174/0x1d8 +coresight-cpu-debug 850000.debug: EDCIDSR: 00000000 +coresight-cpu-debug 850000.debug: EDVIDSR: 90000000 (State:Non-secure Mode:EL1/0 Width:64bits VMID:0) +coresight-cpu-debug 852000.debug: CPU[1]: +coresight-cpu-debug 852000.debug: EDPRSR: 00000001 (Power:On DLK:Unlock) +coresight-cpu-debug 852000.debug: EDPCSR: [] debug_notifier_call+0x23c/0x358 +coresight-cpu-debug 852000.debug: EDCIDSR: 00000000 +coresight-cpu-debug 852000.debug: EDVIDSR: 90000000 (State:Non-secure Mode:EL1/0 Width:64bits VMID:0) -- cgit v1.2.3 From 62a31ce1372a8a52050961904e1ca16bc06e6f45 Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:12 -0600 Subject: doc: Add coresight_cpu_debug.enable to kernel-parameters.txt Add coresight_cpu_debug.enable to kernel-parameters.txt, this flag is used to enable/disable the CPU sampling based debugging. Signed-off-by: Leo Yan Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 15f79c27748d..ff67ad7d2c55 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -649,6 +649,13 @@ /proc//coredump_filter. See also Documentation/filesystems/proc.txt. + coresight_cpu_debug.enable + [ARM,ARM64] + Format: + Enable/disable the CPU sampling based debugging. + 0: default value, disable debugging + 1: enable debugging at boot time + cpuidle.off=1 [CPU_IDLE] disable the cpuidle sub-system -- cgit v1.2.3 From 2fd95d6565f305bc5c1f0bf9922cbff350117f04 Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:13 -0600 Subject: MAINTAINERS: update file entries for Coresight subsystem Update document file entries for Coresight debug module. Signed-off-by: Leo Yan Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- MAINTAINERS | 2 ++ 1 file changed, 2 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 902066f1c17e..2dc114b9e7f7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1207,7 +1207,9 @@ L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers) S: Maintained F: drivers/hwtracing/coresight/* F: Documentation/trace/coresight.txt +F: Documentation/trace/coresight-cpu-debug.txt F: Documentation/devicetree/bindings/arm/coresight.txt +F: Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt F: Documentation/ABI/testing/sysfs-bus-coresight-devices-* F: tools/perf/arch/arm/util/pmu.c F: tools/perf/arch/arm/util/auxtrace.c -- cgit v1.2.3 From 04c9490035691a398d851fd160ce8af08ba0af0d Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Mon, 5 Jun 2017 14:15:14 -0600 Subject: coresight: of_get_coresight_platform_data: Add missing of_node_put The of_get_coresight_platform_data iterates over the possible CPU nodes to find a given cpu phandle. However it does not drop the reference to the node pointer returned by the of_get_coresight_platform_data. This patch also introduces another minor fix is to use of_cpu_device_node_get() to replace of_get_cpu_node(). Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose [Leo: minor tweaks for of_get_coresight_platform_data] Signed-off-by: Leo Yan Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/of_coresight.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c index 2749853b9010..225b2dd5970c 100644 --- a/drivers/hwtracing/coresight/of_coresight.c +++ b/drivers/hwtracing/coresight/of_coresight.c @@ -109,7 +109,8 @@ of_get_coresight_platform_data(struct device *dev, struct coresight_platform_data *pdata; struct of_endpoint endpoint, rendpoint; struct device *rdev; - struct device_node *dn; + bool found; + struct device_node *dn, *np; struct device_node *ep = NULL; struct device_node *rparent = NULL; struct device_node *rport = NULL; @@ -176,17 +177,19 @@ of_get_coresight_platform_data(struct device *dev, } while (ep); } - /* Affinity defaults to CPU0 */ - pdata->cpu = 0; dn = of_parse_phandle(node, "cpu", 0); - for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) { - if (dn == of_get_cpu_node(cpu, NULL)) { - pdata->cpu = cpu; + for_each_possible_cpu(cpu) { + np = of_cpu_device_node_get(cpu); + found = (dn == np); + of_node_put(np); + if (found) break; - } } of_node_put(dn); + /* Affinity to CPU0 if no cpu nodes are found */ + pdata->cpu = found ? cpu : 0; + return pdata; } EXPORT_SYMBOL_GPL(of_get_coresight_platform_data); -- cgit v1.2.3 From c56cdd7a5c836db7834256f09692112afee9eb3f Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:15 -0600 Subject: coresight: refactor with function of_coresight_get_cpu This is refactor to add function of_coresight_get_cpu(), so it's used to retrieve CPU id for coresight component. Finally can use it as a common function for multiple places. Suggested-by: Mathieu Poirier Signed-off-by: Leo Yan Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/of_coresight.c | 43 +++++++++++++++++++----------- include/linux/coresight.h | 3 +++ 2 files changed, 31 insertions(+), 15 deletions(-) diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c index 225b2dd5970c..a18794128bf8 100644 --- a/drivers/hwtracing/coresight/of_coresight.c +++ b/drivers/hwtracing/coresight/of_coresight.c @@ -101,16 +101,40 @@ static int of_coresight_alloc_memory(struct device *dev, return 0; } +int of_coresight_get_cpu(const struct device_node *node) +{ + int cpu; + bool found; + struct device_node *dn, *np; + + dn = of_parse_phandle(node, "cpu", 0); + + /* Affinity defaults to CPU0 */ + if (!dn) + return 0; + + for_each_possible_cpu(cpu) { + np = of_cpu_device_node_get(cpu); + found = (dn == np); + of_node_put(np); + if (found) + break; + } + of_node_put(dn); + + /* Affinity to CPU0 if no cpu nodes are found */ + return found ? cpu : 0; +} +EXPORT_SYMBOL_GPL(of_coresight_get_cpu); + struct coresight_platform_data * of_get_coresight_platform_data(struct device *dev, const struct device_node *node) { - int i = 0, ret = 0, cpu; + int i = 0, ret = 0; struct coresight_platform_data *pdata; struct of_endpoint endpoint, rendpoint; struct device *rdev; - bool found; - struct device_node *dn, *np; struct device_node *ep = NULL; struct device_node *rparent = NULL; struct device_node *rport = NULL; @@ -177,18 +201,7 @@ of_get_coresight_platform_data(struct device *dev, } while (ep); } - dn = of_parse_phandle(node, "cpu", 0); - for_each_possible_cpu(cpu) { - np = of_cpu_device_node_get(cpu); - found = (dn == np); - of_node_put(np); - if (found) - break; - } - of_node_put(dn); - - /* Affinity to CPU0 if no cpu nodes are found */ - pdata->cpu = found ? cpu : 0; + pdata->cpu = of_coresight_get_cpu(node); return pdata; } diff --git a/include/linux/coresight.h b/include/linux/coresight.h index bf0aa50880be..d950dad5056a 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -263,10 +263,13 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset, #endif #ifdef CONFIG_OF +extern int of_coresight_get_cpu(const struct device_node *node); extern struct coresight_platform_data * of_get_coresight_platform_data(struct device *dev, const struct device_node *node); #else +static inline int of_coresight_get_cpu(const struct device_node *node) +{ return 0; } static inline struct coresight_platform_data *of_get_coresight_platform_data( struct device *dev, const struct device_node *node) { return NULL; } #endif -- cgit v1.2.3 From 2227b7c7463402ce92706a6f35c82cad6e8ee19a Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:16 -0600 Subject: coresight: add support for CPU debug module Coresight includes debug module and usually the module connects with CPU debug logic. ARMv8 architecture reference manual (ARM DDI 0487A.k) has description for related info in "Part H: External Debug". Chapter H7 "The Sample-based Profiling Extension" introduces several sampling registers, e.g. we can check program counter value with combined CPU exception level, secure state, etc. So this is helpful for analysis CPU lockup scenarios, e.g. if one CPU has run into infinite loop with IRQ disabled. In this case the CPU cannot switch context and handle any interrupt (including IPIs), as the result it cannot handle SMP call for stack dump. This patch is to enable coresight debug module, so firstly this driver is to bind apb clock for debug module and this is to ensure the debug module can be accessed from program or external debugger. And the driver uses sample-based registers for debug purpose, e.g. when system triggers panic, the driver will dump program counter and combined context registers (EDCIDSR, EDVIDSR); by parsing context registers so can quickly get to know CPU secure state, exception level, etc. Some of the debug module registers are located in CPU power domain, so this requires the CPU power domain stays on when access related debug registers, but the power management for CPU power domain is quite dependent on SoC integration for power management. For the platforms which with sane power controller implementations, this driver follows the method to set EDPRCR to try to pull the CPU out of low power state and then set 'no power down request' bit so the CPU has no chance to lose power. If the SoC has not followed up this design well for power management controller, the user should use the command line parameter or sysfs to constrain all or partial idle states to ensure the CPU power domain is enabled and access coresight CPU debug component safely. Signed-off-by: Leo Yan Reviewed-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/Kconfig | 14 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-cpu-debug.c | 700 ++++++++++++++++++++++ 3 files changed, 715 insertions(+) create mode 100644 drivers/hwtracing/coresight/coresight-cpu-debug.c diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 130cb2114059..8d55d6d79015 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -89,4 +89,18 @@ config CORESIGHT_STM logging useful software events or data coming from various entities in the system, possibly running different OSs +config CORESIGHT_CPU_DEBUG + tristate "CoreSight CPU Debug driver" + depends on ARM || ARM64 + depends on DEBUG_FS + help + This driver provides support for coresight debugging module. This + is primarily used to dump sample-based profiling registers when + system triggers panic, the driver will parse context registers so + can quickly get to know program counter (PC), secure state, + exception level, etc. Before use debugging functionality, platform + needs to ensure the clock domain and power domain are enabled + properly, please refer Documentation/trace/coresight-cpu-debug.txt + for detailed description and the example for usage. + endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index af480d9c1441..433d59025eb6 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -16,3 +16,4 @@ obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o \ coresight-etm4x-sysfs.o obj-$(CONFIG_CORESIGHT_QCOM_REPLICATOR) += coresight-replicator-qcom.o obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o +obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c new file mode 100644 index 000000000000..64a77e00eaa6 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c @@ -0,0 +1,700 @@ +/* + * Copyright (c) 2017 Linaro Limited. All rights reserved. + * + * Author: Leo Yan + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "coresight-priv.h" + +#define EDPCSR 0x0A0 +#define EDCIDSR 0x0A4 +#define EDVIDSR 0x0A8 +#define EDPCSR_HI 0x0AC +#define EDOSLAR 0x300 +#define EDPRCR 0x310 +#define EDPRSR 0x314 +#define EDDEVID1 0xFC4 +#define EDDEVID 0xFC8 + +#define EDPCSR_PROHIBITED 0xFFFFFFFF + +/* bits definition for EDPCSR */ +#define EDPCSR_THUMB BIT(0) +#define EDPCSR_ARM_INST_MASK GENMASK(31, 2) +#define EDPCSR_THUMB_INST_MASK GENMASK(31, 1) + +/* bits definition for EDPRCR */ +#define EDPRCR_COREPURQ BIT(3) +#define EDPRCR_CORENPDRQ BIT(0) + +/* bits definition for EDPRSR */ +#define EDPRSR_DLK BIT(6) +#define EDPRSR_PU BIT(0) + +/* bits definition for EDVIDSR */ +#define EDVIDSR_NS BIT(31) +#define EDVIDSR_E2 BIT(30) +#define EDVIDSR_E3 BIT(29) +#define EDVIDSR_HV BIT(28) +#define EDVIDSR_VMID GENMASK(7, 0) + +/* + * bits definition for EDDEVID1:PSCROffset + * + * NOTE: armv8 and armv7 have different definition for the register, + * so consolidate the bits definition as below: + * + * 0b0000 - Sample offset applies based on the instruction state, we + * rely on EDDEVID to check if EDPCSR is implemented or not + * 0b0001 - No offset applies. + * 0b0010 - No offset applies, but do not use in AArch32 mode + * + */ +#define EDDEVID1_PCSR_OFFSET_MASK GENMASK(3, 0) +#define EDDEVID1_PCSR_OFFSET_INS_SET (0x0) +#define EDDEVID1_PCSR_NO_OFFSET_DIS_AARCH32 (0x2) + +/* bits definition for EDDEVID */ +#define EDDEVID_PCSAMPLE_MODE GENMASK(3, 0) +#define EDDEVID_IMPL_EDPCSR (0x1) +#define EDDEVID_IMPL_EDPCSR_EDCIDSR (0x2) +#define EDDEVID_IMPL_FULL (0x3) + +#define DEBUG_WAIT_SLEEP 1000 +#define DEBUG_WAIT_TIMEOUT 32000 + +struct debug_drvdata { + void __iomem *base; + struct device *dev; + int cpu; + + bool edpcsr_present; + bool edcidsr_present; + bool edvidsr_present; + bool pc_has_offset; + + u32 edpcsr; + u32 edpcsr_hi; + u32 edprsr; + u32 edvidsr; + u32 edcidsr; +}; + +static DEFINE_MUTEX(debug_lock); +static DEFINE_PER_CPU(struct debug_drvdata *, debug_drvdata); +static int debug_count; +static struct dentry *debug_debugfs_dir; + +static bool debug_enable; +module_param_named(enable, debug_enable, bool, 0600); +MODULE_PARM_DESC(enable, "Control to enable coresight CPU debug functionality"); + +static void debug_os_unlock(struct debug_drvdata *drvdata) +{ + /* Unlocks the debug registers */ + writel_relaxed(0x0, drvdata->base + EDOSLAR); + + /* Make sure the registers are unlocked before accessing */ + wmb(); +} + +/* + * According to ARM DDI 0487A.k, before access external debug + * registers should firstly check the access permission; if any + * below condition has been met then cannot access debug + * registers to avoid lockup issue: + * + * - CPU power domain is powered off; + * - The OS Double Lock is locked; + * + * By checking EDPRSR can get to know if meet these conditions. + */ +static bool debug_access_permitted(struct debug_drvdata *drvdata) +{ + /* CPU is powered off */ + if (!(drvdata->edprsr & EDPRSR_PU)) + return false; + + /* The OS Double Lock is locked */ + if (drvdata->edprsr & EDPRSR_DLK) + return false; + + return true; +} + +static void debug_force_cpu_powered_up(struct debug_drvdata *drvdata) +{ + u32 edprcr; + +try_again: + + /* + * Send request to power management controller and assert + * DBGPWRUPREQ signal; if power management controller has + * sane implementation, it should enable CPU power domain + * in case CPU is in low power state. + */ + edprcr = readl_relaxed(drvdata->base + EDPRCR); + edprcr |= EDPRCR_COREPURQ; + writel_relaxed(edprcr, drvdata->base + EDPRCR); + + /* Wait for CPU to be powered up (timeout~=32ms) */ + if (readx_poll_timeout_atomic(readl_relaxed, drvdata->base + EDPRSR, + drvdata->edprsr, (drvdata->edprsr & EDPRSR_PU), + DEBUG_WAIT_SLEEP, DEBUG_WAIT_TIMEOUT)) { + /* + * Unfortunately the CPU cannot be powered up, so return + * back and later has no permission to access other + * registers. For this case, should disable CPU low power + * states to ensure CPU power domain is enabled! + */ + dev_err(drvdata->dev, "%s: power up request for CPU%d failed\n", + __func__, drvdata->cpu); + return; + } + + /* + * At this point the CPU is powered up, so set the no powerdown + * request bit so we don't lose power and emulate power down. + */ + edprcr = readl_relaxed(drvdata->base + EDPRCR); + edprcr |= EDPRCR_COREPURQ | EDPRCR_CORENPDRQ; + writel_relaxed(edprcr, drvdata->base + EDPRCR); + + drvdata->edprsr = readl_relaxed(drvdata->base + EDPRSR); + + /* The core power domain got switched off on use, try again */ + if (unlikely(!(drvdata->edprsr & EDPRSR_PU))) + goto try_again; +} + +static void debug_read_regs(struct debug_drvdata *drvdata) +{ + u32 save_edprcr; + + CS_UNLOCK(drvdata->base); + + /* Unlock os lock */ + debug_os_unlock(drvdata); + + /* Save EDPRCR register */ + save_edprcr = readl_relaxed(drvdata->base + EDPRCR); + + /* + * Ensure CPU power domain is enabled to let registers + * are accessiable. + */ + debug_force_cpu_powered_up(drvdata); + + if (!debug_access_permitted(drvdata)) + goto out; + + drvdata->edpcsr = readl_relaxed(drvdata->base + EDPCSR); + + /* + * As described in ARM DDI 0487A.k, if the processing + * element (PE) is in debug state, or sample-based + * profiling is prohibited, EDPCSR reads as 0xFFFFFFFF; + * EDCIDSR, EDVIDSR and EDPCSR_HI registers also become + * UNKNOWN state. So directly bail out for this case. + */ + if (drvdata->edpcsr == EDPCSR_PROHIBITED) + goto out; + + /* + * A read of the EDPCSR normally has the side-effect of + * indirectly writing to EDCIDSR, EDVIDSR and EDPCSR_HI; + * at this point it's safe to read value from them. + */ + if (IS_ENABLED(CONFIG_64BIT)) + drvdata->edpcsr_hi = readl_relaxed(drvdata->base + EDPCSR_HI); + + if (drvdata->edcidsr_present) + drvdata->edcidsr = readl_relaxed(drvdata->base + EDCIDSR); + + if (drvdata->edvidsr_present) + drvdata->edvidsr = readl_relaxed(drvdata->base + EDVIDSR); + +out: + /* Restore EDPRCR register */ + writel_relaxed(save_edprcr, drvdata->base + EDPRCR); + + CS_LOCK(drvdata->base); +} + +#ifdef CONFIG_64BIT +static unsigned long debug_adjust_pc(struct debug_drvdata *drvdata) +{ + return (unsigned long)drvdata->edpcsr_hi << 32 | + (unsigned long)drvdata->edpcsr; +} +#else +static unsigned long debug_adjust_pc(struct debug_drvdata *drvdata) +{ + unsigned long arm_inst_offset = 0, thumb_inst_offset = 0; + unsigned long pc; + + pc = (unsigned long)drvdata->edpcsr; + + if (drvdata->pc_has_offset) { + arm_inst_offset = 8; + thumb_inst_offset = 4; + } + + /* Handle thumb instruction */ + if (pc & EDPCSR_THUMB) { + pc = (pc & EDPCSR_THUMB_INST_MASK) - thumb_inst_offset; + return pc; + } + + /* + * Handle arm instruction offset, if the arm instruction + * is not 4 byte alignment then it's possible the case + * for implementation defined; keep original value for this + * case and print info for notice. + */ + if (pc & BIT(1)) + dev_emerg(drvdata->dev, + "Instruction offset is implementation defined\n"); + else + pc = (pc & EDPCSR_ARM_INST_MASK) - arm_inst_offset; + + return pc; +} +#endif + +static void debug_dump_regs(struct debug_drvdata *drvdata) +{ + struct device *dev = drvdata->dev; + unsigned long pc; + + dev_emerg(dev, " EDPRSR: %08x (Power:%s DLK:%s)\n", + drvdata->edprsr, + drvdata->edprsr & EDPRSR_PU ? "On" : "Off", + drvdata->edprsr & EDPRSR_DLK ? "Lock" : "Unlock"); + + if (!debug_access_permitted(drvdata)) { + dev_emerg(dev, "No permission to access debug registers!\n"); + return; + } + + if (drvdata->edpcsr == EDPCSR_PROHIBITED) { + dev_emerg(dev, "CPU is in Debug state or profiling is prohibited!\n"); + return; + } + + pc = debug_adjust_pc(drvdata); + dev_emerg(dev, " EDPCSR: [<%p>] %pS\n", (void *)pc, (void *)pc); + + if (drvdata->edcidsr_present) + dev_emerg(dev, " EDCIDSR: %08x\n", drvdata->edcidsr); + + if (drvdata->edvidsr_present) + dev_emerg(dev, " EDVIDSR: %08x (State:%s Mode:%s Width:%dbits VMID:%x)\n", + drvdata->edvidsr, + drvdata->edvidsr & EDVIDSR_NS ? + "Non-secure" : "Secure", + drvdata->edvidsr & EDVIDSR_E3 ? "EL3" : + (drvdata->edvidsr & EDVIDSR_E2 ? + "EL2" : "EL1/0"), + drvdata->edvidsr & EDVIDSR_HV ? 64 : 32, + drvdata->edvidsr & (u32)EDVIDSR_VMID); +} + +static void debug_init_arch_data(void *info) +{ + struct debug_drvdata *drvdata = info; + u32 mode, pcsr_offset; + u32 eddevid, eddevid1; + + CS_UNLOCK(drvdata->base); + + /* Read device info */ + eddevid = readl_relaxed(drvdata->base + EDDEVID); + eddevid1 = readl_relaxed(drvdata->base + EDDEVID1); + + CS_LOCK(drvdata->base); + + /* Parse implementation feature */ + mode = eddevid & EDDEVID_PCSAMPLE_MODE; + pcsr_offset = eddevid1 & EDDEVID1_PCSR_OFFSET_MASK; + + drvdata->edpcsr_present = false; + drvdata->edcidsr_present = false; + drvdata->edvidsr_present = false; + drvdata->pc_has_offset = false; + + switch (mode) { + case EDDEVID_IMPL_FULL: + drvdata->edvidsr_present = true; + /* Fall through */ + case EDDEVID_IMPL_EDPCSR_EDCIDSR: + drvdata->edcidsr_present = true; + /* Fall through */ + case EDDEVID_IMPL_EDPCSR: + /* + * In ARM DDI 0487A.k, the EDDEVID1.PCSROffset is used to + * define if has the offset for PC sampling value; if read + * back EDDEVID1.PCSROffset == 0x2, then this means the debug + * module does not sample the instruction set state when + * armv8 CPU in AArch32 state. + */ + drvdata->edpcsr_present = + ((IS_ENABLED(CONFIG_64BIT) && pcsr_offset != 0) || + (pcsr_offset != EDDEVID1_PCSR_NO_OFFSET_DIS_AARCH32)); + + drvdata->pc_has_offset = + (pcsr_offset == EDDEVID1_PCSR_OFFSET_INS_SET); + break; + default: + break; + } +} + +/* + * Dump out information on panic. + */ +static int debug_notifier_call(struct notifier_block *self, + unsigned long v, void *p) +{ + int cpu; + struct debug_drvdata *drvdata; + + mutex_lock(&debug_lock); + + /* Bail out if the functionality is disabled */ + if (!debug_enable) + goto skip_dump; + + pr_emerg("ARM external debug module:\n"); + + for_each_possible_cpu(cpu) { + drvdata = per_cpu(debug_drvdata, cpu); + if (!drvdata) + continue; + + dev_emerg(drvdata->dev, "CPU[%d]:\n", drvdata->cpu); + + debug_read_regs(drvdata); + debug_dump_regs(drvdata); + } + +skip_dump: + mutex_unlock(&debug_lock); + return 0; +} + +static struct notifier_block debug_notifier = { + .notifier_call = debug_notifier_call, +}; + +static int debug_enable_func(void) +{ + struct debug_drvdata *drvdata; + int cpu, ret = 0; + cpumask_t mask; + + /* + * Use cpumask to track which debug power domains have + * been powered on and use it to handle failure case. + */ + cpumask_clear(&mask); + + for_each_possible_cpu(cpu) { + drvdata = per_cpu(debug_drvdata, cpu); + if (!drvdata) + continue; + + ret = pm_runtime_get_sync(drvdata->dev); + if (ret < 0) + goto err; + else + cpumask_set_cpu(cpu, &mask); + } + + return 0; + +err: + /* + * If pm_runtime_get_sync() has failed, need rollback on + * all the other CPUs that have been enabled before that. + */ + for_each_cpu(cpu, &mask) { + drvdata = per_cpu(debug_drvdata, cpu); + pm_runtime_put_noidle(drvdata->dev); + } + + return ret; +} + +static int debug_disable_func(void) +{ + struct debug_drvdata *drvdata; + int cpu, ret, err = 0; + + /* + * Disable debug power domains, records the error and keep + * circling through all other CPUs when an error has been + * encountered. + */ + for_each_possible_cpu(cpu) { + drvdata = per_cpu(debug_drvdata, cpu); + if (!drvdata) + continue; + + ret = pm_runtime_put(drvdata->dev); + if (ret < 0) + err = ret; + } + + return err; +} + +static ssize_t debug_func_knob_write(struct file *f, + const char __user *buf, size_t count, loff_t *ppos) +{ + u8 val; + int ret; + + ret = kstrtou8_from_user(buf, count, 2, &val); + if (ret) + return ret; + + mutex_lock(&debug_lock); + + if (val == debug_enable) + goto out; + + if (val) + ret = debug_enable_func(); + else + ret = debug_disable_func(); + + if (ret) { + pr_err("%s: unable to %s debug function: %d\n", + __func__, val ? "enable" : "disable", ret); + goto err; + } + + debug_enable = val; +out: + ret = count; +err: + mutex_unlock(&debug_lock); + return ret; +} + +static ssize_t debug_func_knob_read(struct file *f, + char __user *ubuf, size_t count, loff_t *ppos) +{ + ssize_t ret; + char buf[3]; + + mutex_lock(&debug_lock); + snprintf(buf, sizeof(buf), "%d\n", debug_enable); + mutex_unlock(&debug_lock); + + ret = simple_read_from_buffer(ubuf, count, ppos, buf, sizeof(buf)); + return ret; +} + +static const struct file_operations debug_func_knob_fops = { + .open = simple_open, + .read = debug_func_knob_read, + .write = debug_func_knob_write, +}; + +static int debug_func_init(void) +{ + struct dentry *file; + int ret; + + /* Create debugfs node */ + debug_debugfs_dir = debugfs_create_dir("coresight_cpu_debug", NULL); + if (!debug_debugfs_dir) { + pr_err("%s: unable to create debugfs directory\n", __func__); + return -ENOMEM; + } + + file = debugfs_create_file("enable", 0644, debug_debugfs_dir, NULL, + &debug_func_knob_fops); + if (!file) { + pr_err("%s: unable to create enable knob file\n", __func__); + ret = -ENOMEM; + goto err; + } + + /* Register function to be called for panic */ + ret = atomic_notifier_chain_register(&panic_notifier_list, + &debug_notifier); + if (ret) { + pr_err("%s: unable to register notifier: %d\n", + __func__, ret); + goto err; + } + + return 0; + +err: + debugfs_remove_recursive(debug_debugfs_dir); + return ret; +} + +static void debug_func_exit(void) +{ + atomic_notifier_chain_unregister(&panic_notifier_list, + &debug_notifier); + debugfs_remove_recursive(debug_debugfs_dir); +} + +static int debug_probe(struct amba_device *adev, const struct amba_id *id) +{ + void __iomem *base; + struct device *dev = &adev->dev; + struct debug_drvdata *drvdata; + struct resource *res = &adev->res; + struct device_node *np = adev->dev.of_node; + int ret; + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->cpu = np ? of_coresight_get_cpu(np) : 0; + if (per_cpu(debug_drvdata, drvdata->cpu)) { + dev_err(dev, "CPU%d drvdata has already been initialized\n", + drvdata->cpu); + return -EBUSY; + } + + drvdata->dev = &adev->dev; + amba_set_drvdata(adev, drvdata); + + /* Validity for the resource is already checked by the AMBA core */ + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + drvdata->base = base; + + get_online_cpus(); + per_cpu(debug_drvdata, drvdata->cpu) = drvdata; + ret = smp_call_function_single(drvdata->cpu, debug_init_arch_data, + drvdata, 1); + put_online_cpus(); + + if (ret) { + dev_err(dev, "CPU%d debug arch init failed\n", drvdata->cpu); + goto err; + } + + if (!drvdata->edpcsr_present) { + dev_err(dev, "CPU%d sample-based profiling isn't implemented\n", + drvdata->cpu); + ret = -ENXIO; + goto err; + } + + if (!debug_count++) { + ret = debug_func_init(); + if (ret) + goto err_func_init; + } + + mutex_lock(&debug_lock); + /* Turn off debug power domain if debugging is disabled */ + if (!debug_enable) + pm_runtime_put(dev); + mutex_unlock(&debug_lock); + + dev_info(dev, "Coresight debug-CPU%d initialized\n", drvdata->cpu); + return 0; + +err_func_init: + debug_count--; +err: + per_cpu(debug_drvdata, drvdata->cpu) = NULL; + return ret; +} + +static int debug_remove(struct amba_device *adev) +{ + struct device *dev = &adev->dev; + struct debug_drvdata *drvdata = amba_get_drvdata(adev); + + per_cpu(debug_drvdata, drvdata->cpu) = NULL; + + mutex_lock(&debug_lock); + /* Turn off debug power domain before rmmod the module */ + if (debug_enable) + pm_runtime_put(dev); + mutex_unlock(&debug_lock); + + if (!--debug_count) + debug_func_exit(); + + return 0; +} + +static struct amba_id debug_ids[] = { + { /* Debug for Cortex-A53 */ + .id = 0x000bbd03, + .mask = 0x000fffff, + }, + { /* Debug for Cortex-A57 */ + .id = 0x000bbd07, + .mask = 0x000fffff, + }, + { /* Debug for Cortex-A72 */ + .id = 0x000bbd08, + .mask = 0x000fffff, + }, + { 0, 0 }, +}; + +static struct amba_driver debug_driver = { + .drv = { + .name = "coresight-cpu-debug", + .suppress_bind_attrs = true, + }, + .probe = debug_probe, + .remove = debug_remove, + .id_table = debug_ids, +}; + +module_amba_driver(debug_driver); + +MODULE_AUTHOR("Leo Yan "); +MODULE_DESCRIPTION("ARM Coresight CPU Debug Driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 4fcf9a6259a0b21ca198f91737303f5166a788bf Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:17 -0600 Subject: arm64: dts: hi6220: register debug module Bind debug module driver for Hi6220. Signed-off-by: Leo Yan Reviewed-by: Mathieu Poirier Acked-by: Wei Xu Signed-off-by: Greg Kroah-Hartman --- arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 64 +++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi index 1e5129b19280..21805b9786c7 100644 --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi @@ -916,5 +916,69 @@ }; }; }; + + debug@f6590000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf6590000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu0>; + }; + + debug@f6592000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf6592000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu1>; + }; + + debug@f6594000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf6594000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu2>; + }; + + debug@f6596000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf6596000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu3>; + }; + + debug@f65d0000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf65d0000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu4>; + }; + + debug@f65d2000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf65d2000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu5>; + }; + + debug@f65d4000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf65d4000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu6>; + }; + + debug@f65d6000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0 0xf65d6000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu7>; + }; }; }; -- cgit v1.2.3 From 248fa516134f038341bd8598b9d4d627c771dcbe Mon Sep 17 00:00:00 2001 From: Leo Yan Date: Mon, 5 Jun 2017 14:15:18 -0600 Subject: arm64: dts: qcom: msm8916: Add debug unit Add debug unit on Qualcomm msm8916 based platforms, including the DragonBoard 410c board. Signed-off-by: Leo Yan Reviewed-by: Mathieu Poirier Acked-by: Andy Gross Signed-off-by: Greg Kroah-Hartman --- arch/arm64/boot/dts/qcom/msm8916.dtsi | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi index ab3093995ded..17691abea608 100644 --- a/arch/arm64/boot/dts/qcom/msm8916.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi @@ -1116,6 +1116,38 @@ }; }; + debug@850000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0x850000 0x1000>; + clocks = <&rpmcc RPM_QDSS_CLK>; + clock-names = "apb_pclk"; + cpu = <&CPU0>; + }; + + debug@852000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0x852000 0x1000>; + clocks = <&rpmcc RPM_QDSS_CLK>; + clock-names = "apb_pclk"; + cpu = <&CPU1>; + }; + + debug@854000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0x854000 0x1000>; + clocks = <&rpmcc RPM_QDSS_CLK>; + clock-names = "apb_pclk"; + cpu = <&CPU2>; + }; + + debug@856000 { + compatible = "arm,coresight-cpu-debug","arm,primecell"; + reg = <0x856000 0x1000>; + clocks = <&rpmcc RPM_QDSS_CLK>; + clock-names = "apb_pclk"; + cpu = <&CPU3>; + }; + etm@85c000 { compatible = "arm,coresight-etm4x", "arm,primecell"; reg = <0x85c000 0x1000>; -- cgit v1.2.3 From 67e707bd68269aac70904943f07a979eeb163b13 Mon Sep 17 00:00:00 2001 From: Jeff Vander Stoep Date: Thu, 8 Jun 2017 18:09:09 +0530 Subject: config: android-recommended: enable fstack-protector-strong If compiler has stack protector support, set CONFIG_CC_STACKPROTECTOR_STRONG. Reviewed-at: https://android-review.googlesource.com/#/c/238388/ Signed-off-by: Jeff Vander Stoep [AmitP: cherry-picked this change from Android common kernel] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-recommended.config | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/configs/android-recommended.config b/kernel/configs/android-recommended.config index 28ee064b6744..a86faa41bfd2 100644 --- a/kernel/configs/android-recommended.config +++ b/kernel/configs/android-recommended.config @@ -11,6 +11,7 @@ CONFIG_BLK_DEV_DM=y CONFIG_BLK_DEV_LOOP=y CONFIG_BLK_DEV_RAM=y CONFIG_BLK_DEV_RAM_SIZE=8192 +CONFIG_CC_STACKPROTECTOR_STRONG=y CONFIG_COMPACTION=y CONFIG_STRICT_KERNEL_RWX=y CONFIG_DM_CRYPT=y -- cgit v1.2.3 From 0c9238c7a1cfd834d8bb96a2b1fabe0b1a5961df Mon Sep 17 00:00:00 2001 From: Sami Tolvanen Date: Thu, 8 Jun 2017 18:09:10 +0530 Subject: config: android-recommended: enable CONFIG_ARM64_SW_TTBR0_PAN Enable PAN emulation using TTBR0_EL1 switching. Reviewed-at: https://android-review.googlesource.com/#/c/325997/ Signed-off-by: Sami Tolvanen [AmitP: cherry-picked this change from Android common kernel and updated the commit message] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-recommended.config | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/configs/android-recommended.config b/kernel/configs/android-recommended.config index a86faa41bfd2..a02c447769f7 100644 --- a/kernel/configs/android-recommended.config +++ b/kernel/configs/android-recommended.config @@ -6,6 +6,7 @@ # CONFIG_NF_CONNTRACK_SIP is not set # CONFIG_PM_WAKELOCKS_GC is not set # CONFIG_VT is not set +CONFIG_ARM64_SW_TTBR0_PAN=y CONFIG_BACKLIGHT_LCD_SUPPORT=y CONFIG_BLK_DEV_DM=y CONFIG_BLK_DEV_LOOP=y -- cgit v1.2.3 From c1ebc2febdb85a73a4f91a9b9eaab6387619eaa6 Mon Sep 17 00:00:00 2001 From: Max Shi Date: Thu, 8 Jun 2017 18:09:11 +0530 Subject: config: android-base: disable CONFIG_USELIB and CONFIG_FHANDLE Turn off the two kernel configs to disable related system ABI. Reviewed-at: https://android-review.googlesource.com/#/c/264976/ Signed-off-by: Max Shi [AmitP: cherry-picked this change from Android common kernel] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-base.config | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/configs/android-base.config b/kernel/configs/android-base.config index 26a06e09a5bd..efe5ff86767e 100644 --- a/kernel/configs/android-base.config +++ b/kernel/configs/android-base.config @@ -1,10 +1,12 @@ # KEEP ALPHABETICALLY SORTED # CONFIG_DEVKMEM is not set # CONFIG_DEVMEM is not set +# CONFIG_FHANDLE is not set # CONFIG_INET_LRO is not set # CONFIG_MODULES is not set # CONFIG_OABI_COMPAT is not set # CONFIG_SYSVIPC is not set +# CONFIG_USELIB is not set CONFIG_ANDROID=y CONFIG_ANDROID_BINDER_IPC=y CONFIG_ANDROID_LOW_MEMORY_KILLER=y -- cgit v1.2.3 From fb0b1538983c1cf7d2a2242b332a34a953753624 Mon Sep 17 00:00:00 2001 From: Sami Tolvanen Date: Thu, 8 Jun 2017 18:09:12 +0530 Subject: config: android-recommended: enable CONFIG_CPU_SW_DOMAIN_PAN Enable CPU domain PAN to ensure that normal kernel accesses are unable to access userspace addresses. Reviewed-at: https://android-review.googlesource.com/#/c/334035/ Signed-off-by: Sami Tolvanen [AmitP: cherry-picked this change from Android common kernel, updated the commit message and re-placed the CONFIG_STRICT_KERNEL_RWX config in sorted order] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-recommended.config | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/configs/android-recommended.config b/kernel/configs/android-recommended.config index a02c447769f7..946fb92418f7 100644 --- a/kernel/configs/android-recommended.config +++ b/kernel/configs/android-recommended.config @@ -14,7 +14,7 @@ CONFIG_BLK_DEV_RAM=y CONFIG_BLK_DEV_RAM_SIZE=8192 CONFIG_CC_STACKPROTECTOR_STRONG=y CONFIG_COMPACTION=y -CONFIG_STRICT_KERNEL_RWX=y +CONFIG_CPU_SW_DOMAIN_PAN=y CONFIG_DM_CRYPT=y CONFIG_DM_UEVENT=y CONFIG_DM_VERITY=y @@ -107,6 +107,7 @@ CONFIG_SCHEDSTATS=y CONFIG_SMARTJOYPLUS_FF=y CONFIG_SND=y CONFIG_SOUND=y +CONFIG_STRICT_KERNEL_RWX=y CONFIG_SUSPEND_TIME=y CONFIG_TABLET_USB_ACECAD=y CONFIG_TABLET_USB_AIPTEK=y -- cgit v1.2.3 From 5b89db2fa545b473dc352689ac3afe407367ea34 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 8 Jun 2017 18:09:13 +0530 Subject: config: android-base: add CONFIG_IKCONFIG option This adds CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC options, which are a requirement for the O release. Reviewed-at: https://android-review.googlesource.com/#/c/364553/ Signed-off-by: Greg Kroah-Hartman [AmitP: cherry-picked this change from Android common kernel] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-base.config | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/configs/android-base.config b/kernel/configs/android-base.config index efe5ff86767e..e12cfec25758 100644 --- a/kernel/configs/android-base.config +++ b/kernel/configs/android-base.config @@ -25,6 +25,8 @@ CONFIG_EMBEDDED=y CONFIG_FB=y CONFIG_HARDENED_USERCOPY=y CONFIG_HIGH_RES_TIMERS=y +CONFIG_IKCONFIG=y +CONFIG_IKCONFIG_PROC=y CONFIG_INET6_AH=y CONFIG_INET6_ESP=y CONFIG_INET6_IPCOMP=y -- cgit v1.2.3 From 2096e1706336d83cd66ca744e4d904af4d63e25c Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 8 Jun 2017 18:09:14 +0530 Subject: config: android-base: add CONFIG_MODULES option This adds CONFIG_MODULES, CONFIG_MODULE_UNLOAD, and CONFIG_MODVERSIONS which are required by the O release. Reviewed-at: https://android-review.googlesource.com/#/c/364554/ Signed-off-by: Greg Kroah-Hartman [AmitP: cherry-picked this change from Android common kernel] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-base.config | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/configs/android-base.config b/kernel/configs/android-base.config index e12cfec25758..62cb392fc34b 100644 --- a/kernel/configs/android-base.config +++ b/kernel/configs/android-base.config @@ -3,7 +3,6 @@ # CONFIG_DEVMEM is not set # CONFIG_FHANDLE is not set # CONFIG_INET_LRO is not set -# CONFIG_MODULES is not set # CONFIG_OABI_COMPAT is not set # CONFIG_SYSVIPC is not set # CONFIG_USELIB is not set @@ -64,6 +63,9 @@ CONFIG_IP_NF_TARGET_MASQUERADE=y CONFIG_IP_NF_TARGET_NETMAP=y CONFIG_IP_NF_TARGET_REDIRECT=y CONFIG_IP_NF_TARGET_REJECT=y +CONFIG_MODULES=y +CONFIG_MODULE_UNLOAD=y +CONFIG_MODVERSIONS=y CONFIG_NET=y CONFIG_NETDEVICES=y CONFIG_NETFILTER=y -- cgit v1.2.3 From 2edfe6be206adc4c1055e053322d27267f8952bc Mon Sep 17 00:00:00 2001 From: Chenbo Feng Date: Thu, 8 Jun 2017 18:09:15 +0530 Subject: config: android-base: add CGROUP_BPF Add CONFIG_CGROUP_BPF as a default configuration in android base config since it is used to replace XT_QTAGUID in future. Reviewed-at: https://android-review.googlesource.com/#/c/400374/ Signed-off-by: Chenbo Feng [AmitP: cherry-picked this change from Android common kernel] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-base.config | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/configs/android-base.config b/kernel/configs/android-base.config index 62cb392fc34b..cdde5af6b332 100644 --- a/kernel/configs/android-base.config +++ b/kernel/configs/android-base.config @@ -14,6 +14,7 @@ CONFIG_ASHMEM=y CONFIG_AUDIT=y CONFIG_BLK_DEV_INITRD=y CONFIG_CGROUPS=y +CONFIG_CGROUP_BPF=y CONFIG_CGROUP_CPUACCT=y CONFIG_CGROUP_DEBUG=y CONFIG_CGROUP_FREEZER=y -- cgit v1.2.3 From 9e69dd0179c346dfb5d08b8d46d5f5c9c81ab1b7 Mon Sep 17 00:00:00 2001 From: Roberto Pereira Date: Thu, 8 Jun 2017 18:09:16 +0530 Subject: config: android-base: disable CONFIG_NFSD and CONFIG_NFS_FS Disable Network file system support. Reviewed-at: https://android-review.googlesource.com/#/c/409559/ Signed-off-by: Roberto Pereira [AmitP: cherry-picked this change from Android common kernel and updated commit message] Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- kernel/configs/android-base.config | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/configs/android-base.config b/kernel/configs/android-base.config index cdde5af6b332..d70829033bb7 100644 --- a/kernel/configs/android-base.config +++ b/kernel/configs/android-base.config @@ -3,6 +3,8 @@ # CONFIG_DEVMEM is not set # CONFIG_FHANDLE is not set # CONFIG_INET_LRO is not set +# CONFIG_NFSD is not set +# CONFIG_NFS_FS is not set # CONFIG_OABI_COMPAT is not set # CONFIG_SYSVIPC is not set # CONFIG_USELIB is not set -- cgit v1.2.3 From 09aecfab93b8f728c5d65d33f26055b7e726df3b Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:36 -0500 Subject: drivers/fsi: Add fsi master definition Add a `struct fsi_master` to represent a FSI master controller. FSI master drivers register one of these structs to provide device-specific of the standard operations: read/write/term/break and link control. Includes changes from Edward A. James & Jeremy Kerr . Signed-off-by: Jeremy Kerr Signed-off-by: Chris Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 35 +++++++++++++++++++++++++++++++++++ drivers/fsi/fsi-master.h | 41 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+) create mode 100644 drivers/fsi/fsi-master.h diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 3d55bd547178..ca02913866f5 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -15,8 +15,43 @@ #include #include +#include #include +#include "fsi-master.h" + +static DEFINE_IDA(master_ida); + +/* FSI master support */ +int fsi_master_register(struct fsi_master *master) +{ + int rc; + + if (!master) + return -EINVAL; + + master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); + dev_set_name(&master->dev, "fsi%d", master->idx); + + rc = device_register(&master->dev); + if (rc) + ida_simple_remove(&master_ida, master->idx); + + return rc; +} +EXPORT_SYMBOL_GPL(fsi_master_register); + +void fsi_master_unregister(struct fsi_master *master) +{ + if (master->idx >= 0) { + ida_simple_remove(&master_ida, master->idx); + master->idx = -1; + } + + device_unregister(&master->dev); +} +EXPORT_SYMBOL_GPL(fsi_master_unregister); + /* FSI core & Linux bus type definitions */ static int fsi_bus_match(struct device *dev, struct device_driver *drv) diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h new file mode 100644 index 000000000000..7764b0079d28 --- /dev/null +++ b/drivers/fsi/fsi-master.h @@ -0,0 +1,41 @@ +/* + * FSI master definitions. These comprise the core <--> master interface, + * to allow the core to interact with the (hardware-specific) masters. + * + * Copyright (C) IBM Corporation 2016 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef DRIVERS_FSI_MASTER_H +#define DRIVERS_FSI_MASTER_H + +#include + +struct fsi_master { + struct device dev; + int idx; + int n_links; + int flags; + int (*read)(struct fsi_master *, int link, uint8_t id, + uint32_t addr, void *val, size_t size); + int (*write)(struct fsi_master *, int link, uint8_t id, + uint32_t addr, const void *val, size_t size); + int (*term)(struct fsi_master *, int link, uint8_t id); + int (*send_break)(struct fsi_master *, int link); + int (*link_enable)(struct fsi_master *, int link); +}; + +#define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev) + +extern int fsi_master_register(struct fsi_master *master); +extern void fsi_master_unregister(struct fsi_master *master); + +#endif /* DRIVERS_FSI_MASTER_H */ -- cgit v1.2.3 From faf0b116dec119d766cb2cdf9cd954b5ee88d546 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:37 -0500 Subject: drivers/fsi: Add slave definition Add the initial fsi slave device, which is private to the core code. This will be a child of the master, and parent to endpoint devices. Signed-off-by: Jeremy Kerr Signed-off-by: Chris Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index ca02913866f5..2f19509fa1da 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -22,6 +22,16 @@ static DEFINE_IDA(master_ida); +struct fsi_slave { + struct device dev; + struct fsi_master *master; + int id; + int link; + uint32_t size; /* size of slave address space */ +}; + +#define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) + /* FSI master support */ int fsi_master_register(struct fsi_master *master) { -- cgit v1.2.3 From 414c1026319bc10796a868c1fa0ba312c4ca9e67 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:38 -0500 Subject: drivers/fsi: Add empty master scan When a new fsi master is added, we will need to scan its links, and slaves attached to those links. This change introduces a little shell to iterate the links, which we will populate with the actual slave scan in a later change. Signed-off-by: Jeremy Kerr Signed-off-by: Chris Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 2f19509fa1da..e90d45dec168 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -32,7 +32,25 @@ struct fsi_slave { #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) +/* FSI slave support */ +static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) +{ + /* todo: initialise slave device, perform engine scan */ + + return -ENODEV; +} + /* FSI master support */ +static int fsi_master_scan(struct fsi_master *master) +{ + int link; + + for (link = 0; link < master->n_links; link++) + fsi_slave_init(master, link, 0); + + return 0; +} + int fsi_master_register(struct fsi_master *master) { int rc; @@ -44,10 +62,13 @@ int fsi_master_register(struct fsi_master *master) dev_set_name(&master->dev, "fsi%d", master->idx); rc = device_register(&master->dev); - if (rc) + if (rc) { ida_simple_remove(&master_ida, master->idx); + return rc; + } - return rc; + fsi_master_scan(master); + return 0; } EXPORT_SYMBOL_GPL(fsi_master_register); -- cgit v1.2.3 From 0cbaa44841db3d06d2a21ae4ab679882033f3dbe Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:39 -0500 Subject: lib: Add crc4 module Add a little helper for crc4 calculations. This works 4-bits-at-a-time, using a simple table approach. We will need this in the FSI core code, as well as any master implementations that need to calculate CRCs in software. Signed-off-by: Jeremy Kerr Signed-off-by: Chris Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- include/linux/crc4.h | 8 ++++++++ lib/Kconfig | 8 ++++++++ lib/Makefile | 1 + lib/crc4.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 63 insertions(+) create mode 100644 include/linux/crc4.h create mode 100644 lib/crc4.c diff --git a/include/linux/crc4.h b/include/linux/crc4.h new file mode 100644 index 000000000000..8f739f1d794f --- /dev/null +++ b/include/linux/crc4.h @@ -0,0 +1,8 @@ +#ifndef _LINUX_CRC4_H +#define _LINUX_CRC4_H + +#include + +extern uint8_t crc4(uint8_t c, uint64_t x, int bits); + +#endif /* _LINUX_CRC4_H */ diff --git a/lib/Kconfig b/lib/Kconfig index 0c8b78a9ae2e..d2fd2623721e 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -158,6 +158,14 @@ config CRC32_BIT endchoice +config CRC4 + tristate "CRC4 functions" + help + This option is provided for the case where no in-kernel-tree + modules require CRC4 functions, but a module built outside + the kernel tree does. Such modules that use library CRC4 + functions require M here. + config CRC7 tristate "CRC7 functions" help diff --git a/lib/Makefile b/lib/Makefile index 0166fbc0fa81..90cf124e5feb 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -99,6 +99,7 @@ obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o obj-$(CONFIG_CRC32) += crc32.o obj-$(CONFIG_CRC32_SELFTEST) += crc32test.o +obj-$(CONFIG_CRC4) += crc4.o obj-$(CONFIG_CRC7) += crc7.o obj-$(CONFIG_LIBCRC32C) += libcrc32c.o obj-$(CONFIG_CRC8) += crc8.o diff --git a/lib/crc4.c b/lib/crc4.c new file mode 100644 index 000000000000..cf6db46661be --- /dev/null +++ b/lib/crc4.c @@ -0,0 +1,46 @@ +/* + * crc4.c - simple crc-4 calculations. + * + * This source code is licensed under the GNU General Public License, Version + * 2. See the file COPYING for more details. + */ + +#include +#include + +static const uint8_t crc4_tab[] = { + 0x0, 0x7, 0xe, 0x9, 0xb, 0xc, 0x5, 0x2, + 0x1, 0x6, 0xf, 0x8, 0xa, 0xd, 0x4, 0x3, +}; + +/** + * crc4 - calculate the 4-bit crc of a value. + * @crc: starting crc4 + * @x: value to checksum + * @bits: number of bits in @x to checksum + * + * Returns the crc4 value of @x, using polynomial 0b10111. + * + * The @x value is treated as left-aligned, and bits above @bits are ignored + * in the crc calculations. + */ +uint8_t crc4(uint8_t c, uint64_t x, int bits) +{ + int i; + + /* mask off anything above the top bit */ + x &= (1ull << bits) - 1; + + /* Align to 4-bits */ + bits = (bits + 3) & ~0x3; + + /* Calculate crc4 over four-bit nibbles, starting at the MSbit */ + for (i = bits - 4; i >= 0; i -= 4) + c = crc4_tab[c ^ ((x >> i) & 0xf)]; + + return c; +} +EXPORT_SYMBOL_GPL(crc4); + +MODULE_DESCRIPTION("CRC4 calculations"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 014c2abc530d7f3674c195891cef7128352453e0 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:40 -0500 Subject: drivers/fsi: Add slave & master read/write APIs Introduce functions to perform reads/writes on the slave address space; these simply pass the request on the slave's master with the correct link and slave ID. We implement these on top of similar helpers for the master. Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Signed-off-by: Chris Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index e90d45dec168..1ec97909e520 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -32,7 +32,64 @@ struct fsi_slave { #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) +static int fsi_master_read(struct fsi_master *master, int link, + uint8_t slave_id, uint32_t addr, void *val, size_t size); +static int fsi_master_write(struct fsi_master *master, int link, + uint8_t slave_id, uint32_t addr, const void *val, size_t size); + /* FSI slave support */ +static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, + uint8_t *idp) +{ + uint32_t addr = *addrp; + uint8_t id = *idp; + + if (addr > slave->size) + return -EINVAL; + + /* For 23 bit addressing, we encode the extra two bits in the slave + * id (and the slave's actual ID needs to be 0). + */ + if (addr > 0x1fffff) { + if (slave->id != 0) + return -EINVAL; + id = (addr >> 21) & 0x3; + addr &= 0x1fffff; + } + + *addrp = addr; + *idp = id; + return 0; +} + +static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, + void *val, size_t size) +{ + uint8_t id = slave->id; + int rc; + + rc = fsi_slave_calc_addr(slave, &addr, &id); + if (rc) + return rc; + + return fsi_master_read(slave->master, slave->link, id, + addr, val, size); +} + +static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, + const void *val, size_t size) +{ + uint8_t id = slave->id; + int rc; + + rc = fsi_slave_calc_addr(slave, &addr, &id); + if (rc) + return rc; + + return fsi_master_write(slave->master, slave->link, id, + addr, val, size); +} + static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) { /* todo: initialise slave device, perform engine scan */ @@ -41,6 +98,41 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) } /* FSI master support */ +static int fsi_check_access(uint32_t addr, size_t size) +{ + if (size != 1 && size != 2 && size != 4) + return -EINVAL; + + if ((addr & 0x3) != (size & 0x3)) + return -EINVAL; + + return 0; +} + +static int fsi_master_read(struct fsi_master *master, int link, + uint8_t slave_id, uint32_t addr, void *val, size_t size) +{ + int rc; + + rc = fsi_check_access(addr, size); + if (rc) + return rc; + + return master->read(master, link, slave_id, addr, val, size); +} + +static int fsi_master_write(struct fsi_master *master, int link, + uint8_t slave_id, uint32_t addr, const void *val, size_t size) +{ + int rc; + + rc = fsi_check_access(addr, size); + if (rc) + return rc; + + return master->write(master, link, slave_id, addr, val, size); +} + static int fsi_master_scan(struct fsi_master *master) { int link; -- cgit v1.2.3 From 26095282119ecf1088193d09388fa40700e34e45 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:41 -0500 Subject: drivers/fsi: Set up links for slave communication Enable each link and send a break command, and try to detect a slave by reading from the SMODE register. Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 1ec97909e520..235f17a6d89e 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -133,12 +133,45 @@ static int fsi_master_write(struct fsi_master *master, int link, return master->write(master, link, slave_id, addr, val, size); } +static int fsi_master_link_enable(struct fsi_master *master, int link) +{ + if (master->link_enable) + return master->link_enable(master, link); + + return 0; +} + +/* + * Issue a break command on this link + */ +static int fsi_master_break(struct fsi_master *master, int link) +{ + if (master->send_break) + return master->send_break(master, link); + + return 0; +} + static int fsi_master_scan(struct fsi_master *master) { - int link; + int link, rc; + + for (link = 0; link < master->n_links; link++) { + rc = fsi_master_link_enable(master, link); + if (rc) { + dev_dbg(&master->dev, + "enable link %d failed: %d\n", link, rc); + continue; + } + rc = fsi_master_break(master, link); + if (rc) { + dev_dbg(&master->dev, + "break to link %d failed: %d\n", link, rc); + continue; + } - for (link = 0; link < master->n_links; link++) fsi_slave_init(master, link, 0); + } return 0; } -- cgit v1.2.3 From 2b545cd8e1b2a2bd60d991c7f1b45a30c673ece2 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:42 -0500 Subject: drivers/fsi: Implement slave initialisation Implement fsi_slave_init: if we can read a chip ID, create fsi_slave devices and register with the driver core. Includes changes from Christopher Bostic . Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/Kconfig | 1 + drivers/fsi/fsi-core.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 66 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index 04c1a0efa7a7..e1006c6808a7 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -6,6 +6,7 @@ menu "FSI support" config FSI tristate "FSI support" + select CRC4 ---help--- FSI - the FRU Support Interface - is a simple bus for low-level access to POWER-based hardware. diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 235f17a6d89e..9d9adc17072c 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -13,13 +13,17 @@ * GNU General Public License for more details. */ +#include #include #include #include #include +#include #include "fsi-master.h" +#define FSI_SLAVE_SIZE_23b 0x800000 + static DEFINE_IDA(master_ida); struct fsi_slave { @@ -90,11 +94,70 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, addr, val, size); } +static void fsi_slave_release(struct device *dev) +{ + struct fsi_slave *slave = to_fsi_slave(dev); + + kfree(slave); +} + static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) { - /* todo: initialise slave device, perform engine scan */ + struct fsi_slave *slave; + uint32_t chip_id; + uint8_t crc; + int rc; + + /* Currently, we only support single slaves on a link, and use the + * full 23-bit address range + */ + if (id != 0) + return -EINVAL; + + rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id)); + if (rc) { + dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", + link, id, rc); + return -ENODEV; + } + chip_id = be32_to_cpu(chip_id); + + crc = crc4(0, chip_id, 32); + if (crc) { + dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", + link, id); + return -EIO; + } + + dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", + chip_id, master->idx, link, id); + + /* We can communicate with a slave; create the slave device and + * register. + */ + slave = kzalloc(sizeof(*slave), GFP_KERNEL); + if (!slave) + return -ENOMEM; + + slave->master = master; + slave->dev.parent = &master->dev; + slave->dev.release = fsi_slave_release; + slave->link = link; + slave->id = id; + slave->size = FSI_SLAVE_SIZE_23b; + + dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); + rc = device_register(&slave->dev); + if (rc < 0) { + dev_warn(&master->dev, "failed to create slave device: %d\n", + rc); + put_device(&slave->dev); + return rc; + } + + /* todo: perform engine scan */ - return -ENODEV; + return rc; } /* FSI master support */ -- cgit v1.2.3 From 2b37c3e285f9dfd76735b0b4b26e0ada949e97b5 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:43 -0500 Subject: drivers/fsi: Set slave SMODE to init communication Set CFAM to appropriate ID so that the controlling master can manage link memory ranges. Add slave engine register definitions. Includes changes from Jeremy Kerr . Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 9d9adc17072c..04795f2e591e 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -22,6 +22,27 @@ #include "fsi-master.h" +#define FSI_SLAVE_BASE 0x800 + +/* + * FSI slave engine control register offsets + */ +#define FSI_SMODE 0x0 /* R/W: Mode register */ + +/* + * SMODE fields + */ +#define FSI_SMODE_WSC 0x80000000 /* Warm start done */ +#define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ +#define FSI_SMODE_SID_SHIFT 24 /* ID shift */ +#define FSI_SMODE_SID_MASK 3 /* ID Mask */ +#define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ +#define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ +#define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ +#define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ +#define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ +#define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ + #define FSI_SLAVE_SIZE_23b 0x800000 static DEFINE_IDA(master_ida); @@ -94,6 +115,52 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, addr, val, size); } +/* Encode slave local bus echo delay */ +static inline uint32_t fsi_smode_echodly(int x) +{ + return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; +} + +/* Encode slave local bus send delay */ +static inline uint32_t fsi_smode_senddly(int x) +{ + return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; +} + +/* Encode slave local bus clock rate ratio */ +static inline uint32_t fsi_smode_lbcrr(int x) +{ + return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; +} + +/* Encode slave ID */ +static inline uint32_t fsi_smode_sid(int x) +{ + return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; +} + +static const uint32_t fsi_slave_smode(int id) +{ + return FSI_SMODE_WSC | FSI_SMODE_ECRC + | fsi_smode_sid(id) + | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) + | fsi_smode_lbcrr(0x8); +} + +static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) +{ + uint32_t smode; + + /* set our smode register with the slave ID field to 0; this enables + * extended slave addressing + */ + smode = fsi_slave_smode(id); + smode = cpu_to_be32(smode); + + return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, + &smode, sizeof(smode)); +} + static void fsi_slave_release(struct device *dev) { struct fsi_slave *slave = to_fsi_slave(dev); @@ -132,6 +199,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", chip_id, master->idx, link, id); + rc = fsi_slave_set_smode(master, link, id); + if (rc) { + dev_warn(&master->dev, + "can't set smode on slave:%02x:%02x %d\n", + link, id, rc); + return -ENODEV; + } + /* We can communicate with a slave; create the slave device and * register. */ -- cgit v1.2.3 From f7ade2a603cfd205a6d7afb9d96ac7975f666dd6 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:44 -0500 Subject: drivers/fsi: scan slaves & register devices Now that we have fsi_slave devices, scan each for endpoints, and register them on the fsi bus. Includes contributions from Christopher Bostic . Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++- include/linux/fsi.h | 4 ++ 2 files changed, 131 insertions(+), 1 deletion(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 04795f2e591e..eac0bc4f71e9 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -19,9 +19,23 @@ #include #include #include +#include #include "fsi-master.h" +#define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) +#define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) +#define FSI_SLAVE_CONF_SLOTS_SHIFT 16 +#define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) +#define FSI_SLAVE_CONF_VERSION_SHIFT 12 +#define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) +#define FSI_SLAVE_CONF_TYPE_SHIFT 4 +#define FSI_SLAVE_CONF_CRC_SHIFT 4 +#define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) +#define FSI_SLAVE_CONF_DATA_BITS 28 + +static const int engine_page_size = 0x400; + #define FSI_SLAVE_BASE 0x800 /* @@ -62,6 +76,30 @@ static int fsi_master_read(struct fsi_master *master, int link, static int fsi_master_write(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, const void *val, size_t size); +/* FSI endpoint-device support */ + +static void fsi_device_release(struct device *_device) +{ + struct fsi_device *device = to_fsi_dev(_device); + + kfree(device); +} + +static struct fsi_device *fsi_create_device(struct fsi_slave *slave) +{ + struct fsi_device *dev; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return NULL; + + dev->dev.parent = &slave->dev; + dev->dev.bus = &fsi_bus_type; + dev->dev.release = fsi_device_release; + + return dev; +} + /* FSI slave support */ static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, uint8_t *idp) @@ -115,6 +153,91 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, addr, val, size); } +static int fsi_slave_scan(struct fsi_slave *slave) +{ + uint32_t engine_addr; + uint32_t conf; + int rc, i; + + /* + * scan engines + * + * We keep the peek mode and slave engines for the core; so start + * at the third slot in the configuration table. We also need to + * skip the chip ID entry at the start of the address space. + */ + engine_addr = engine_page_size * 3; + for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { + uint8_t slots, version, type, crc; + struct fsi_device *dev; + + rc = fsi_slave_read(slave, (i + 1) * sizeof(conf), + &conf, sizeof(conf)); + if (rc) { + dev_warn(&slave->dev, + "error reading slave registers\n"); + return -1; + } + conf = be32_to_cpu(conf); + + crc = crc4(0, conf, 32); + if (crc) { + dev_warn(&slave->dev, + "crc error in slave register at 0x%04x\n", + i); + return -1; + } + + slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) + >> FSI_SLAVE_CONF_SLOTS_SHIFT; + version = (conf & FSI_SLAVE_CONF_VERSION_MASK) + >> FSI_SLAVE_CONF_VERSION_SHIFT; + type = (conf & FSI_SLAVE_CONF_TYPE_MASK) + >> FSI_SLAVE_CONF_TYPE_SHIFT; + + /* + * Unused address areas are marked by a zero type value; this + * skips the defined address areas + */ + if (type != 0 && slots != 0) { + + /* create device */ + dev = fsi_create_device(slave); + if (!dev) + return -ENOMEM; + + dev->slave = slave; + dev->engine_type = type; + dev->version = version; + dev->unit = i; + dev->addr = engine_addr; + dev->size = slots * engine_page_size; + + dev_dbg(&slave->dev, + "engine[%i]: type %x, version %x, addr %x size %x\n", + dev->unit, dev->engine_type, version, + dev->addr, dev->size); + + dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", + slave->master->idx, slave->link, + slave->id, i - 2); + + rc = device_register(&dev->dev); + if (rc) { + dev_warn(&slave->dev, "add failed: %d\n", rc); + put_device(&dev->dev); + } + } + + engine_addr += slots * engine_page_size; + + if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) + break; + } + + return 0; +} + /* Encode slave local bus echo delay */ static inline uint32_t fsi_smode_echodly(int x) { @@ -230,7 +353,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) return rc; } - /* todo: perform engine scan */ + rc = fsi_slave_scan(slave); + if (rc) + dev_dbg(&master->dev, "failed during slave scan with: %d\n", + rc); return rc; } diff --git a/include/linux/fsi.h b/include/linux/fsi.h index 273cbf6400ea..efa55ba6cb39 100644 --- a/include/linux/fsi.h +++ b/include/linux/fsi.h @@ -21,6 +21,10 @@ struct fsi_device { struct device dev; u8 engine_type; u8 version; + u8 unit; + struct fsi_slave *slave; + uint32_t addr; + uint32_t size; }; struct fsi_device_id { -- cgit v1.2.3 From 4efe37f4c4efcb73562e4634cb6c262b08ab6451 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:45 -0500 Subject: drivers/fsi: Add device read/write/peek API This change introduces the fsi device API: simple read, write and peek accessors for the devices' address spaces. Includes contributions from Christopher Bostic and Edward A. James . Signed-off-by: Edward A. James Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++- include/linux/fsi.h | 7 ++++++- 2 files changed, 55 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index eac0bc4f71e9..d7a6e762527f 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -34,6 +34,8 @@ #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) #define FSI_SLAVE_CONF_DATA_BITS 28 +#define FSI_PEEK_BASE 0x410 + static const int engine_page_size = 0x400; #define FSI_SLAVE_BASE 0x800 @@ -75,8 +77,54 @@ static int fsi_master_read(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, void *val, size_t size); static int fsi_master_write(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, const void *val, size_t size); +static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, + void *val, size_t size); +static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, + const void *val, size_t size); + +/* + * fsi_device_read() / fsi_device_write() / fsi_device_peek() + * + * FSI endpoint-device support + * + * Read / write / peek accessors for a client + * + * Parameters: + * dev: Structure passed to FSI client device drivers on probe(). + * addr: FSI address of given device. Client should pass in its base address + * plus desired offset to access its register space. + * val: For read/peek this is the value read at the specified address. For + * write this is value to write to the specified address. + * The data in val must be FSI bus endian (big endian). + * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. + * Addresses must be aligned on size boundaries or an error will result. + */ +int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, + size_t size) +{ + if (addr > dev->size || size > dev->size || addr > dev->size - size) + return -EINVAL; -/* FSI endpoint-device support */ + return fsi_slave_read(dev->slave, dev->addr + addr, val, size); +} +EXPORT_SYMBOL_GPL(fsi_device_read); + +int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, + size_t size) +{ + if (addr > dev->size || size > dev->size || addr > dev->size - size) + return -EINVAL; + + return fsi_slave_write(dev->slave, dev->addr + addr, val, size); +} +EXPORT_SYMBOL_GPL(fsi_device_write); + +int fsi_device_peek(struct fsi_device *dev, void *val) +{ + uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); + + return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); +} static void fsi_device_release(struct device *_device) { diff --git a/include/linux/fsi.h b/include/linux/fsi.h index efa55ba6cb39..66bce4851ff6 100644 --- a/include/linux/fsi.h +++ b/include/linux/fsi.h @@ -27,6 +27,12 @@ struct fsi_device { uint32_t size; }; +extern int fsi_device_read(struct fsi_device *dev, uint32_t addr, + void *val, size_t size); +extern int fsi_device_write(struct fsi_device *dev, uint32_t addr, + const void *val, size_t size); +extern int fsi_device_peek(struct fsi_device *dev, void *val); + struct fsi_device_id { u8 engine_type; u8 version; @@ -40,7 +46,6 @@ struct fsi_device_id { #define FSI_DEVICE_VERSIONED(t, v) \ .engine_type = (t), .version = (v), - struct fsi_driver { struct device_driver drv; const struct fsi_device_id *id_table; -- cgit v1.2.3 From cd0fdb5c07b27bac8ce617459c3599f7be315ce5 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:46 -0500 Subject: drivers/fsi: Add master unscan Allow a master to undo a previous scan. Should a master scan a bus twice it will need to ensure it doesn't double register any previously detected device. Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley ---- v7 - Unscan when unregistering master - Remove leading '__'s from function names - Return fail state for sysfs rescan file Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index d7a6e762527f..fcb0c818524f 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -71,6 +71,7 @@ struct fsi_slave { uint32_t size; /* size of slave address space */ }; +#define to_fsi_master(d) container_of(d, struct fsi_master, dev) #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) static int fsi_master_read(struct fsi_master *master, int link, @@ -488,6 +489,40 @@ static int fsi_master_scan(struct fsi_master *master) return 0; } +static int fsi_slave_remove_device(struct device *dev, void *arg) +{ + device_unregister(dev); + return 0; +} + +static int fsi_master_remove_slave(struct device *dev, void *arg) +{ + device_for_each_child(dev, NULL, fsi_slave_remove_device); + device_unregister(dev); + return 0; +} + +static void fsi_master_unscan(struct fsi_master *master) +{ + device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); +} + +static ssize_t master_rescan_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct fsi_master *master = to_fsi_master(dev); + int rc; + + fsi_master_unscan(master); + rc = fsi_master_scan(master); + if (rc < 0) + return rc; + + return count; +} + +static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); + int fsi_master_register(struct fsi_master *master) { int rc; @@ -504,7 +539,15 @@ int fsi_master_register(struct fsi_master *master) return rc; } + rc = device_create_file(&master->dev, &dev_attr_rescan); + if (rc) { + device_unregister(&master->dev); + ida_simple_remove(&master_ida, master->idx); + return rc; + } + fsi_master_scan(master); + return 0; } EXPORT_SYMBOL_GPL(fsi_master_register); @@ -516,6 +559,7 @@ void fsi_master_unregister(struct fsi_master *master) master->idx = -1; } + fsi_master_unscan(master); device_unregister(&master->dev); } EXPORT_SYMBOL_GPL(fsi_master_unregister); -- cgit v1.2.3 From 777dcf7391be81644360c15c375b24c96ceb49ce Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:47 -0500 Subject: drivers/fsi: Add documentation for GPIO bindings Add fsi master gpio device tree binding documentation. Includes changes from Jeremy Kerr . Signed-off-by: Christopher Bostic Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Acked-by: Rob Herring Signed-off-by: Greg Kroah-Hartman --- .../devicetree/bindings/fsi/fsi-master-gpio.txt | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 Documentation/devicetree/bindings/fsi/fsi-master-gpio.txt diff --git a/Documentation/devicetree/bindings/fsi/fsi-master-gpio.txt b/Documentation/devicetree/bindings/fsi/fsi-master-gpio.txt new file mode 100644 index 000000000000..a767259dedad --- /dev/null +++ b/Documentation/devicetree/bindings/fsi/fsi-master-gpio.txt @@ -0,0 +1,24 @@ +Device-tree bindings for gpio-based FSI master driver +----------------------------------------------------- + +Required properties: + - compatible = "fsi-master-gpio"; + - clock-gpios = ; : GPIO for FSI clock + - data-gpios = ; : GPIO for FSI data signal + +Optional properties: + - enable-gpios = ; : GPIO for enable signal + - trans-gpios = ; : GPIO for voltage translator enable + - mux-gpios = ; : GPIO for pin multiplexing with other + functions (eg, external FSI masters) + +Examples: + + fsi-master { + compatible = "fsi-master-gpio", "fsi-master"; + clock-gpios = <&gpio 0>; + data-gpios = <&gpio 1>; + enable-gpios = <&gpio 2>; + trans-gpios = <&gpio 3>; + mux-gpios = <&gpio 4>; + } -- cgit v1.2.3 From 356d8009a5a4569f17a3508b50a347bdf4d5b337 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:48 -0500 Subject: drivers/fsi: Add client driver register utilities Add driver_register and driver_unregister wrappers for FSI. Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 17 +++++++++++++++++ include/linux/fsi.h | 12 ++++++++++++ 2 files changed, 29 insertions(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index fcb0c818524f..e9fbd9feeb3e 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -586,6 +586,23 @@ static int fsi_bus_match(struct device *dev, struct device_driver *drv) return 0; } +int fsi_driver_register(struct fsi_driver *fsi_drv) +{ + if (!fsi_drv) + return -EINVAL; + if (!fsi_drv->id_table) + return -EINVAL; + + return driver_register(&fsi_drv->drv); +} +EXPORT_SYMBOL_GPL(fsi_driver_register); + +void fsi_driver_unregister(struct fsi_driver *fsi_drv) +{ + driver_unregister(&fsi_drv->drv); +} +EXPORT_SYMBOL_GPL(fsi_driver_unregister); + struct bus_type fsi_bus_type = { .name = "fsi", .match = fsi_bus_match, diff --git a/include/linux/fsi.h b/include/linux/fsi.h index 66bce4851ff6..34f1e9aea725 100644 --- a/include/linux/fsi.h +++ b/include/linux/fsi.h @@ -54,6 +54,18 @@ struct fsi_driver { #define to_fsi_dev(devp) container_of(devp, struct fsi_device, dev) #define to_fsi_drv(drvp) container_of(drvp, struct fsi_driver, drv) +extern int fsi_driver_register(struct fsi_driver *fsi_drv); +extern void fsi_driver_unregister(struct fsi_driver *fsi_drv); + +/* module_fsi_driver() - Helper macro for drivers that don't do + * anything special in module init/exit. This eliminates a lot of + * boilerplate. Each module may only use this macro once, and + * calling it replaces module_init() and module_exit() + */ +#define module_fsi_driver(__fsi_driver) \ + module_driver(__fsi_driver, fsi_driver_register, \ + fsi_driver_unregister) + extern struct bus_type fsi_bus_type; #endif /* LINUX_FSI_H */ -- cgit v1.2.3 From 125739cbc1c3b29c89ae44f85904cf18fc49a2fb Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:49 -0500 Subject: drivers/fsi: Add sysfs files for FSI master & slave accesses This change adds a 'raw' file for reads & writes, and a 'term' file for the TERM command, and a 'break' file for issuing a BREAK. Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index e9fbd9feeb3e..626cc0672552 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -287,6 +287,95 @@ static int fsi_slave_scan(struct fsi_slave *slave) return 0; } +static ssize_t fsi_slave_sysfs_raw_read(struct file *file, + struct kobject *kobj, struct bin_attribute *attr, char *buf, + loff_t off, size_t count) +{ + struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); + size_t total_len, read_len; + int rc; + + if (off < 0) + return -EINVAL; + + if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) + return -EINVAL; + + for (total_len = 0; total_len < count; total_len += read_len) { + read_len = min_t(size_t, count, 4); + read_len -= off & 0x3; + + rc = fsi_slave_read(slave, off, buf + total_len, read_len); + if (rc) + return rc; + + off += read_len; + } + + return count; +} + +static ssize_t fsi_slave_sysfs_raw_write(struct file *file, + struct kobject *kobj, struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); + size_t total_len, write_len; + int rc; + + if (off < 0) + return -EINVAL; + + if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) + return -EINVAL; + + for (total_len = 0; total_len < count; total_len += write_len) { + write_len = min_t(size_t, count, 4); + write_len -= off & 0x3; + + rc = fsi_slave_write(slave, off, buf + total_len, write_len); + if (rc) + return rc; + + off += write_len; + } + + return count; +} + +static struct bin_attribute fsi_slave_raw_attr = { + .attr = { + .name = "raw", + .mode = 0600, + }, + .size = 0, + .read = fsi_slave_sysfs_raw_read, + .write = fsi_slave_sysfs_raw_write, +}; + +static ssize_t fsi_slave_sysfs_term_write(struct file *file, + struct kobject *kobj, struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); + struct fsi_master *master = slave->master; + + if (!master->term) + return -ENODEV; + + master->term(master, slave->link, slave->id); + return count; +} + +static struct bin_attribute fsi_slave_term_attr = { + .attr = { + .name = "term", + .mode = 0200, + }, + .size = 0, + .write = fsi_slave_sysfs_term_write, +}; + /* Encode slave local bus echo delay */ static inline uint32_t fsi_smode_echodly(int x) { @@ -402,6 +491,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) return rc; } + rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); + if (rc) + dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); + + rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); + if (rc) + dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); + rc = fsi_slave_scan(slave); if (rc) dev_dbg(&master->dev, "failed during slave scan with: %d\n", @@ -523,6 +620,18 @@ static ssize_t master_rescan_store(struct device *dev, static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); +static ssize_t master_break_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct fsi_master *master = to_fsi_master(dev); + + fsi_master_break(master, 0); + + return count; +} + +static DEVICE_ATTR(break, 0200, NULL, master_break_store); + int fsi_master_register(struct fsi_master *master) { int rc; @@ -546,6 +655,13 @@ int fsi_master_register(struct fsi_master *master) return rc; } + rc = device_create_file(&master->dev, &dev_attr_break); + if (rc) { + device_unregister(&master->dev); + ida_simple_remove(&master_ida, master->idx); + return rc; + } + fsi_master_scan(master); return 0; -- cgit v1.2.3 From da36cadf89a75a730302a4df114cb930b1becc39 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:50 -0500 Subject: drivers/fsi: expose direct-access slave API Allow drivers to access the slave address ranges. Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 30 ++++++++++++++++++++++++------ include/linux/fsi.h | 12 ++++++++++++ 2 files changed, 36 insertions(+), 6 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 626cc0672552..36813651ac0a 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -78,10 +78,6 @@ static int fsi_master_read(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, void *val, size_t size); static int fsi_master_write(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, const void *val, size_t size); -static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, - void *val, size_t size); -static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, - const void *val, size_t size); /* * fsi_device_read() / fsi_device_write() / fsi_device_peek() @@ -174,7 +170,7 @@ static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, return 0; } -static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, +int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, void *val, size_t size) { uint8_t id = slave->id; @@ -187,8 +183,9 @@ static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, return fsi_master_read(slave->master, slave->link, id, addr, val, size); } +EXPORT_SYMBOL_GPL(fsi_slave_read); -static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, +int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, const void *val, size_t size) { uint8_t id = slave->id; @@ -201,6 +198,27 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, return fsi_master_write(slave->master, slave->link, id, addr, val, size); } +EXPORT_SYMBOL_GPL(fsi_slave_write); + +extern int fsi_slave_claim_range(struct fsi_slave *slave, + uint32_t addr, uint32_t size) +{ + if (addr + size < addr) + return -EINVAL; + + if (addr + size > slave->size) + return -EINVAL; + + /* todo: check for overlapping claims */ + return 0; +} +EXPORT_SYMBOL_GPL(fsi_slave_claim_range); + +extern void fsi_slave_release_range(struct fsi_slave *slave, + uint32_t addr, uint32_t size) +{ +} +EXPORT_SYMBOL_GPL(fsi_slave_release_range); static int fsi_slave_scan(struct fsi_slave *slave) { diff --git a/include/linux/fsi.h b/include/linux/fsi.h index 34f1e9aea725..141fd38d061f 100644 --- a/include/linux/fsi.h +++ b/include/linux/fsi.h @@ -66,6 +66,18 @@ extern void fsi_driver_unregister(struct fsi_driver *fsi_drv); module_driver(__fsi_driver, fsi_driver_register, \ fsi_driver_unregister) +/* direct slave API */ +extern int fsi_slave_claim_range(struct fsi_slave *slave, + uint32_t addr, uint32_t size); +extern void fsi_slave_release_range(struct fsi_slave *slave, + uint32_t addr, uint32_t size); +extern int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, + void *val, size_t size); +extern int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, + const void *val, size_t size); + + + extern struct bus_type fsi_bus_type; #endif /* LINUX_FSI_H */ -- cgit v1.2.3 From 66433b05a3b2b8f95be9e6269bc21e916febf482 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:51 -0500 Subject: drivers/fsi: Add tracepoints for low-level operations Trace low level read and write FSI bus operations. Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 27 +++++++--- include/trace/events/fsi.h | 127 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 148 insertions(+), 6 deletions(-) create mode 100644 include/trace/events/fsi.h diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 36813651ac0a..db54561161ac 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -23,6 +23,9 @@ #include "fsi-master.h" +#define CREATE_TRACE_POINTS +#include + #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 @@ -542,11 +545,16 @@ static int fsi_master_read(struct fsi_master *master, int link, { int rc; + trace_fsi_master_read(master, link, slave_id, addr, size); + rc = fsi_check_access(addr, size); - if (rc) - return rc; + if (!rc) + rc = master->read(master, link, slave_id, addr, val, size); + + trace_fsi_master_rw_result(master, link, slave_id, addr, size, + false, val, rc); - return master->read(master, link, slave_id, addr, val, size); + return rc; } static int fsi_master_write(struct fsi_master *master, int link, @@ -554,11 +562,16 @@ static int fsi_master_write(struct fsi_master *master, int link, { int rc; + trace_fsi_master_write(master, link, slave_id, addr, size, val); + rc = fsi_check_access(addr, size); - if (rc) - return rc; + if (!rc) + rc = master->write(master, link, slave_id, addr, val, size); - return master->write(master, link, slave_id, addr, val, size); + trace_fsi_master_rw_result(master, link, slave_id, addr, size, + true, val, rc); + + return rc; } static int fsi_master_link_enable(struct fsi_master *master, int link) @@ -574,6 +587,8 @@ static int fsi_master_link_enable(struct fsi_master *master, int link) */ static int fsi_master_break(struct fsi_master *master, int link) { + trace_fsi_master_break(master, link); + if (master->send_break) return master->send_break(master, link); diff --git a/include/trace/events/fsi.h b/include/trace/events/fsi.h new file mode 100644 index 000000000000..697ee6678892 --- /dev/null +++ b/include/trace/events/fsi.h @@ -0,0 +1,127 @@ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM fsi + +#if !defined(_TRACE_FSI_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_FSI_H + +#include + +TRACE_EVENT(fsi_master_read, + TP_PROTO(const struct fsi_master *master, int link, int id, + uint32_t addr, size_t size), + TP_ARGS(master, link, id, addr, size), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, link) + __field(int, id) + __field(__u32, addr) + __field(size_t, size) + ), + TP_fast_assign( + __entry->master_idx = master->idx; + __entry->link = link; + __entry->id = id; + __entry->addr = addr; + __entry->size = size; + ), + TP_printk("fsi%d:%02d:%02d %08x[%zd]", + __entry->master_idx, + __entry->link, + __entry->id, + __entry->addr, + __entry->size + ) +); + +TRACE_EVENT(fsi_master_write, + TP_PROTO(const struct fsi_master *master, int link, int id, + uint32_t addr, size_t size, const void *data), + TP_ARGS(master, link, id, addr, size, data), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, link) + __field(int, id) + __field(__u32, addr) + __field(size_t, size) + __field(__u32, data) + ), + TP_fast_assign( + __entry->master_idx = master->idx; + __entry->link = link; + __entry->id = id; + __entry->addr = addr; + __entry->size = size; + __entry->data = 0; + memcpy(&__entry->data, data, size); + ), + TP_printk("fsi%d:%02d:%02d %08x[%zd] <= {%*ph}", + __entry->master_idx, + __entry->link, + __entry->id, + __entry->addr, + __entry->size, + (int)__entry->size, &__entry->data + ) +); + +TRACE_EVENT(fsi_master_rw_result, + TP_PROTO(const struct fsi_master *master, int link, int id, + uint32_t addr, size_t size, + bool write, const void *data, int ret), + TP_ARGS(master, link, id, addr, size, write, data, ret), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, link) + __field(int, id) + __field(__u32, addr) + __field(size_t, size) + __field(bool, write) + __field(__u32, data) + __field(int, ret) + ), + TP_fast_assign( + __entry->master_idx = master->idx; + __entry->link = link; + __entry->id = id; + __entry->addr = addr; + __entry->size = size; + __entry->write = write; + __entry->data = 0; + __entry->ret = ret; + if (__entry->write || !__entry->ret) + memcpy(&__entry->data, data, size); + ), + TP_printk("fsi%d:%02d:%02d %08x[%zd] %s {%*ph} ret %d", + __entry->master_idx, + __entry->link, + __entry->id, + __entry->addr, + __entry->size, + __entry->write ? "<=" : "=>", + (int)__entry->size, &__entry->data, + __entry->ret + ) +); + +TRACE_EVENT(fsi_master_break, + TP_PROTO(const struct fsi_master *master, int link), + TP_ARGS(master, link), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, link) + ), + TP_fast_assign( + __entry->master_idx = master->idx; + __entry->link = link; + ), + TP_printk("fsi%d:%d", + __entry->master_idx, + __entry->link + ) +); + + +#endif /* _TRACE_FSI_H */ + +#include -- cgit v1.2.3 From 1fa847d74a75b76c6028b1e943434c471bd2619c Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:52 -0500 Subject: drivers/fsi: Add error handling for slave This change implements error handling in the FSI core, by cleaining up and retrying failed operations, using the SISC, TERM and BREAK facilities. Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 114 insertions(+), 7 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index db54561161ac..c9ff8d3b3f03 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -46,7 +46,9 @@ static const int engine_page_size = 0x400; /* * FSI slave engine control register offsets */ -#define FSI_SMODE 0x0 /* R/W: Mode register */ +#define FSI_SMODE 0x0 /* R/W: Mode register */ +#define FSI_SISC 0x8 /* R/W: Interrupt condition */ +#define FSI_SSTAT 0x14 /* R : Slave status */ /* * SMODE fields @@ -77,10 +79,14 @@ struct fsi_slave { #define to_fsi_master(d) container_of(d, struct fsi_master, dev) #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) +static const int slave_retries = 2; +static int discard_errors; + static int fsi_master_read(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, void *val, size_t size); static int fsi_master_write(struct fsi_master *master, int link, uint8_t slave_id, uint32_t addr, const void *val, size_t size); +static int fsi_master_break(struct fsi_master *master, int link); /* * fsi_device_read() / fsi_device_write() / fsi_device_peek() @@ -173,18 +179,107 @@ static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, return 0; } +int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) +{ + struct fsi_master *master = slave->master; + uint32_t irq, stat; + int rc, link; + uint8_t id; + + link = slave->link; + id = slave->id; + + rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, + &irq, sizeof(irq)); + if (rc) + return rc; + + rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, + &stat, sizeof(stat)); + if (rc) + return rc; + + dev_info(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", + be32_to_cpu(stat), be32_to_cpu(irq)); + + /* clear interrupts */ + return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, + &irq, sizeof(irq)); +} + +static int fsi_slave_set_smode(struct fsi_master *master, int link, int id); + +int fsi_slave_handle_error(struct fsi_slave *slave, bool write, uint32_t addr, + size_t size) +{ + struct fsi_master *master = slave->master; + int rc, link; + uint32_t reg; + uint8_t id; + + if (discard_errors) + return -1; + + link = slave->link; + id = slave->id; + + dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", + write ? "write" : "read", addr, size); + + /* try a simple clear of error conditions, which may fail if we've lost + * communication with the slave + */ + rc = fsi_slave_report_and_clear_errors(slave); + if (!rc) + return 0; + + /* send a TERM and retry */ + if (master->term) { + rc = master->term(master, link, id); + if (!rc) { + rc = fsi_master_read(master, link, id, 0, + ®, sizeof(reg)); + if (!rc) + rc = fsi_slave_report_and_clear_errors(slave); + if (!rc) + return 0; + } + } + + /* getting serious, reset the slave via BREAK */ + rc = fsi_master_break(master, link); + if (rc) + return rc; + + rc = fsi_slave_set_smode(master, link, id); + if (rc) + return rc; + + return fsi_slave_report_and_clear_errors(slave); +} + int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, void *val, size_t size) { uint8_t id = slave->id; - int rc; + int rc, err_rc, i; rc = fsi_slave_calc_addr(slave, &addr, &id); if (rc) return rc; - return fsi_master_read(slave->master, slave->link, id, - addr, val, size); + for (i = 0; i < slave_retries; i++) { + rc = fsi_master_read(slave->master, slave->link, + id, addr, val, size); + if (!rc) + break; + + err_rc = fsi_slave_handle_error(slave, false, addr, size); + if (err_rc) + break; + } + + return rc; } EXPORT_SYMBOL_GPL(fsi_slave_read); @@ -192,14 +287,24 @@ int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, const void *val, size_t size) { uint8_t id = slave->id; - int rc; + int rc, err_rc, i; rc = fsi_slave_calc_addr(slave, &addr, &id); if (rc) return rc; - return fsi_master_write(slave->master, slave->link, id, - addr, val, size); + for (i = 0; i < slave_retries; i++) { + rc = fsi_master_write(slave->master, slave->link, + id, addr, val, size); + if (!rc) + break; + + err_rc = fsi_slave_handle_error(slave, true, addr, size); + if (err_rc) + break; + } + + return rc; } EXPORT_SYMBOL_GPL(fsi_slave_write); @@ -770,3 +875,5 @@ static void fsi_exit(void) module_init(fsi_init); module_exit(fsi_exit); +module_param(discard_errors, int, 0664); +MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); -- cgit v1.2.3 From a7ec9371dd11f0bc705a703fa0e5c1c11339f1a6 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:53 -0500 Subject: drivers/fsi: Document FSI master sysfs files in ABI Add info for sysfs scan file in Documentaiton ABI/testing Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-bus-fsi | 38 +++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-fsi diff --git a/Documentation/ABI/testing/sysfs-bus-fsi b/Documentation/ABI/testing/sysfs-bus-fsi new file mode 100644 index 000000000000..57c806350d6c --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-fsi @@ -0,0 +1,38 @@ +What: /sys/bus/platform/devices/fsi-master/rescan +Date: May 2017 +KernelVersion: 4.12 +Contact: cbostic@linux.vnet.ibm.com +Description: + Initiates a FSI master scan for all connected slave devices + on its links. + +What: /sys/bus/platform/devices/fsi-master/break +Date: May 2017 +KernelVersion: 4.12 +Contact: cbostic@linux.vnet.ibm.com +Description: + Sends an FSI BREAK command on a master's communication + link to any connnected slaves. A BREAK resets connected + device's logic and preps it to receive further commands + from the master. + +What: /sys/bus/platform/devices/fsi-master/slave@00:00/term +Date: May 2017 +KernelVersion: 4.12 +Contact: cbostic@linux.vnet.ibm.com +Description: + Sends an FSI terminate command from the master to its + connected slave. A terminate resets the slave's state machines + that control access to the internally connected engines. In + addition the slave freezes its internal error register for + debugging purposes. This command is also needed to abort any + ongoing operation in case of an expired 'Master Time Out' + timer. + +What: /sys/bus/platform/devices/fsi-master/slave@00:00/raw +Date: May 2017 +KernelVersion: 4.12 +Contact: cbostic@linux.vnet.ibm.com +Description: + Provides a means of reading/writing a 32 bit value from/to a + specified FSI bus address. -- cgit v1.2.3 From ac0385d9f609e836e82213c75a24ae87f8fe1c9f Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:54 -0500 Subject: drivers/fsi: Add GPIO based FSI master Implement a FSI master using GPIO. Will generate FSI protocol for read and write commands to particular addresses. Sends master command and waits for and decodes a slave response. Includes changes from Edward A. James and Jeremy Kerr . Signed-off-by: Edward A. James Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/Kconfig | 12 + drivers/fsi/Makefile | 1 + drivers/fsi/fsi-master-gpio.c | 594 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 607 insertions(+) create mode 100644 drivers/fsi/fsi-master-gpio.c diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index e1006c6808a7..ba1663754f8a 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -10,4 +10,16 @@ config FSI ---help--- FSI - the FRU Support Interface - is a simple bus for low-level access to POWER-based hardware. + +if FSI + +config FSI_MASTER_GPIO + tristate "GPIO-based FSI master" + depends on GPIOLIB + select CRC4 + ---help--- + This option enables a FSI master driver using GPIO lines. + +endif + endmenu diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile index db0e5e7c1655..ed28ac016de6 100644 --- a/drivers/fsi/Makefile +++ b/drivers/fsi/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_FSI) += fsi-core.o +obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c new file mode 100644 index 000000000000..d467e61065a9 --- /dev/null +++ b/drivers/fsi/fsi-master-gpio.c @@ -0,0 +1,594 @@ +/* + * A FSI master controller, using a simple GPIO bit-banging interface + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "fsi-master.h" + +#define FSI_GPIO_STD_DLY 1 /* Standard pin delay in nS */ +#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */ +#define FSI_PRE_BREAK_CLOCKS 50 /* Number clocks to prep for break */ +#define FSI_BREAK_CLOCKS 256 /* Number of clocks to issue break */ +#define FSI_POST_BREAK_CLOCKS 16000 /* Number clocks to set up cfam */ +#define FSI_INIT_CLOCKS 5000 /* Clock out any old data */ +#define FSI_GPIO_STD_DELAY 10 /* Standard GPIO delay in nS */ + /* todo: adjust down as low as */ + /* possible or eliminate */ +#define FSI_GPIO_CMD_DPOLL 0x2 +#define FSI_GPIO_CMD_TERM 0x3f +#define FSI_GPIO_CMD_ABS_AR 0x4 + +#define FSI_GPIO_DPOLL_CLOCKS 100 /* < 21 will cause slave to hang */ + +/* Bus errors */ +#define FSI_GPIO_ERR_BUSY 1 /* Slave stuck in busy state */ +#define FSI_GPIO_RESP_ERRA 2 /* Any (misc) Error */ +#define FSI_GPIO_RESP_ERRC 3 /* Slave reports master CRC error */ +#define FSI_GPIO_MTOE 4 /* Master time out error */ +#define FSI_GPIO_CRC_INVAL 5 /* Master reports slave CRC error */ + +/* Normal slave responses */ +#define FSI_GPIO_RESP_BUSY 1 +#define FSI_GPIO_RESP_ACK 0 +#define FSI_GPIO_RESP_ACKD 4 + +#define FSI_GPIO_MAX_BUSY 100 +#define FSI_GPIO_MTOE_COUNT 1000 +#define FSI_GPIO_DRAIN_BITS 20 +#define FSI_GPIO_CRC_SIZE 4 +#define FSI_GPIO_MSG_ID_SIZE 2 +#define FSI_GPIO_MSG_RESPID_SIZE 2 +#define FSI_GPIO_PRIME_SLAVE_CLOCKS 100 + +struct fsi_master_gpio { + struct fsi_master master; + struct device *dev; + spinlock_t cmd_lock; /* Lock for commands */ + struct gpio_desc *gpio_clk; + struct gpio_desc *gpio_data; + struct gpio_desc *gpio_trans; /* Voltage translator */ + struct gpio_desc *gpio_enable; /* FSI enable */ + struct gpio_desc *gpio_mux; /* Mux control */ +}; + +#define to_fsi_master_gpio(m) container_of(m, struct fsi_master_gpio, master) + +struct fsi_gpio_msg { + uint64_t msg; + uint8_t bits; +}; + +static void clock_toggle(struct fsi_master_gpio *master, int count) +{ + int i; + + for (i = 0; i < count; i++) { + ndelay(FSI_GPIO_STD_DLY); + gpiod_set_value(master->gpio_clk, 0); + ndelay(FSI_GPIO_STD_DLY); + gpiod_set_value(master->gpio_clk, 1); + } +} + +static int sda_in(struct fsi_master_gpio *master) +{ + int in; + + ndelay(FSI_GPIO_STD_DLY); + in = gpiod_get_value(master->gpio_data); + return in ? 1 : 0; +} + +static void sda_out(struct fsi_master_gpio *master, int value) +{ + gpiod_set_value(master->gpio_data, value); +} + +static void set_sda_input(struct fsi_master_gpio *master) +{ + gpiod_direction_input(master->gpio_data); + gpiod_set_value(master->gpio_trans, 0); +} + +static void set_sda_output(struct fsi_master_gpio *master, int value) +{ + gpiod_set_value(master->gpio_trans, 1); + gpiod_direction_output(master->gpio_data, value); +} + +static void clock_zeros(struct fsi_master_gpio *master, int count) +{ + set_sda_output(master, 1); + clock_toggle(master, count); +} + +static void serial_in(struct fsi_master_gpio *master, struct fsi_gpio_msg *msg, + uint8_t num_bits) +{ + uint8_t bit, in_bit; + + set_sda_input(master); + + for (bit = 0; bit < num_bits; bit++) { + clock_toggle(master, 1); + in_bit = sda_in(master); + msg->msg <<= 1; + msg->msg |= ~in_bit & 0x1; /* Data is active low */ + } + msg->bits += num_bits; +} + +static void serial_out(struct fsi_master_gpio *master, + const struct fsi_gpio_msg *cmd) +{ + uint8_t bit; + uint64_t msg = ~cmd->msg; /* Data is active low */ + uint64_t sda_mask = 0x1ULL << (cmd->bits - 1); + uint64_t last_bit = ~0; + int next_bit; + + if (!cmd->bits) { + dev_warn(master->dev, "trying to output 0 bits\n"); + return; + } + set_sda_output(master, 0); + + /* Send the start bit */ + sda_out(master, 0); + clock_toggle(master, 1); + + /* Send the message */ + for (bit = 0; bit < cmd->bits; bit++) { + next_bit = (msg & sda_mask) >> (cmd->bits - 1); + if (last_bit ^ next_bit) { + sda_out(master, next_bit); + last_bit = next_bit; + } + clock_toggle(master, 1); + msg <<= 1; + } +} + +static void msg_push_bits(struct fsi_gpio_msg *msg, uint64_t data, int bits) +{ + msg->msg <<= bits; + msg->msg |= data & ((1ull << bits) - 1); + msg->bits += bits; +} + +static void msg_push_crc(struct fsi_gpio_msg *msg) +{ + uint8_t crc; + int top; + + top = msg->bits & 0x3; + + /* start bit, and any non-aligned top bits */ + crc = crc4(0, 1 << top | msg->msg >> (msg->bits - top), top + 1); + + /* aligned bits */ + crc = crc4(crc, msg->msg, msg->bits - top); + + msg_push_bits(msg, crc, 4); +} + +/* + * Encode an Absolute Address command + */ +static void build_abs_ar_command(struct fsi_gpio_msg *cmd, + uint8_t id, uint32_t addr, size_t size, const void *data) +{ + bool write = !!data; + uint8_t ds; + int i; + + cmd->bits = 0; + cmd->msg = 0; + + msg_push_bits(cmd, id, 2); + msg_push_bits(cmd, FSI_GPIO_CMD_ABS_AR, 3); + msg_push_bits(cmd, write ? 0 : 1, 1); + + /* + * The read/write size is encoded in the lower bits of the address + * (as it must be naturally-aligned), and the following ds bit. + * + * size addr:1 addr:0 ds + * 1 x x 0 + * 2 x 0 1 + * 4 0 1 1 + * + */ + ds = size > 1 ? 1 : 0; + addr &= ~(size - 1); + if (size == 4) + addr |= 1; + + msg_push_bits(cmd, addr & ((1 << 21) - 1), 21); + msg_push_bits(cmd, ds, 1); + for (i = 0; write && i < size; i++) + msg_push_bits(cmd, ((uint8_t *)data)[i], 8); + + msg_push_crc(cmd); +} + +static void build_dpoll_command(struct fsi_gpio_msg *cmd, uint8_t slave_id) +{ + cmd->bits = 0; + cmd->msg = 0; + + msg_push_bits(cmd, slave_id, 2); + msg_push_bits(cmd, FSI_GPIO_CMD_DPOLL, 3); + msg_push_crc(cmd); +} + +static void echo_delay(struct fsi_master_gpio *master) +{ + set_sda_output(master, 1); + clock_toggle(master, FSI_ECHO_DELAY_CLOCKS); +} + +static void build_term_command(struct fsi_gpio_msg *cmd, uint8_t slave_id) +{ + cmd->bits = 0; + cmd->msg = 0; + + msg_push_bits(cmd, slave_id, 2); + msg_push_bits(cmd, FSI_GPIO_CMD_TERM, 6); + msg_push_crc(cmd); +} + +/* + * Store information on master errors so handler can detect and clean + * up the bus + */ +static void fsi_master_gpio_error(struct fsi_master_gpio *master, int error) +{ + +} + +static int read_one_response(struct fsi_master_gpio *master, + uint8_t data_size, struct fsi_gpio_msg *msgp, uint8_t *tagp) +{ + struct fsi_gpio_msg msg; + uint8_t id, tag; + uint32_t crc; + int i; + + /* wait for the start bit */ + for (i = 0; i < FSI_GPIO_MTOE_COUNT; i++) { + msg.bits = 0; + msg.msg = 0; + serial_in(master, &msg, 1); + if (msg.msg) + break; + } + if (i == FSI_GPIO_MTOE_COUNT) { + dev_dbg(master->dev, + "Master time out waiting for response\n"); + fsi_master_gpio_error(master, FSI_GPIO_MTOE); + return -EIO; + } + + msg.bits = 0; + msg.msg = 0; + + /* Read slave ID & response tag */ + serial_in(master, &msg, 4); + + id = (msg.msg >> FSI_GPIO_MSG_RESPID_SIZE) & 0x3; + tag = msg.msg & 0x3; + + /* If we have an ACK and we're expecting data, clock the data in too */ + if (tag == FSI_GPIO_RESP_ACK && data_size) + serial_in(master, &msg, data_size * 8); + + /* read CRC */ + serial_in(master, &msg, FSI_GPIO_CRC_SIZE); + + /* we have a whole message now; check CRC */ + crc = crc4(0, 1, 1); + crc = crc4(crc, msg.msg, msg.bits); + if (crc) { + dev_dbg(master->dev, "ERR response CRC\n"); + fsi_master_gpio_error(master, FSI_GPIO_CRC_INVAL); + return -EIO; + } + + if (msgp) + *msgp = msg; + if (tagp) + *tagp = tag; + + return 0; +} + +static int issue_term(struct fsi_master_gpio *master, uint8_t slave) +{ + struct fsi_gpio_msg cmd; + uint8_t tag; + int rc; + + build_term_command(&cmd, slave); + serial_out(master, &cmd); + echo_delay(master); + + rc = read_one_response(master, 0, NULL, &tag); + if (rc < 0) { + dev_err(master->dev, + "TERM failed; lost communication with slave\n"); + return -EIO; + } else if (tag != FSI_GPIO_RESP_ACK) { + dev_err(master->dev, "TERM failed; response %d\n", tag); + return -EIO; + } + + return 0; +} + +static int poll_for_response(struct fsi_master_gpio *master, + uint8_t slave, uint8_t size, void *data) +{ + struct fsi_gpio_msg response, cmd; + int busy_count = 0, rc, i; + uint8_t tag; + uint8_t *data_byte = data; + +retry: + rc = read_one_response(master, size, &response, &tag); + if (rc) + return rc; + + switch (tag) { + case FSI_GPIO_RESP_ACK: + if (size && data) { + uint64_t val = response.msg; + /* clear crc & mask */ + val >>= 4; + val &= (1ull << (size * 8)) - 1; + + for (i = 0; i < size; i++) { + data_byte[size-i-1] = val; + val >>= 8; + } + } + break; + case FSI_GPIO_RESP_BUSY: + /* + * Its necessary to clock slave before issuing + * d-poll, not indicated in the hardware protocol + * spec. < 20 clocks causes slave to hang, 21 ok. + */ + clock_zeros(master, FSI_GPIO_DPOLL_CLOCKS); + if (busy_count++ < FSI_GPIO_MAX_BUSY) { + build_dpoll_command(&cmd, slave); + serial_out(master, &cmd); + echo_delay(master); + goto retry; + } + dev_warn(master->dev, + "ERR slave is stuck in busy state, issuing TERM\n"); + issue_term(master, slave); + rc = -EIO; + break; + + case FSI_GPIO_RESP_ERRA: + case FSI_GPIO_RESP_ERRC: + dev_dbg(master->dev, "ERR%c received: 0x%x\n", + tag == FSI_GPIO_RESP_ERRA ? 'A' : 'C', + (int)response.msg); + fsi_master_gpio_error(master, response.msg); + rc = -EIO; + break; + } + + /* Clock the slave enough to be ready for next operation */ + clock_zeros(master, FSI_GPIO_PRIME_SLAVE_CLOCKS); + return rc; +} + +static int fsi_master_gpio_xfer(struct fsi_master_gpio *master, uint8_t slave, + struct fsi_gpio_msg *cmd, size_t resp_len, void *resp) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(&master->cmd_lock, flags); + serial_out(master, cmd); + echo_delay(master); + rc = poll_for_response(master, slave, resp_len, resp); + spin_unlock_irqrestore(&master->cmd_lock, flags); + + return rc; +} + +static int fsi_master_gpio_read(struct fsi_master *_master, int link, + uint8_t id, uint32_t addr, void *val, size_t size) +{ + struct fsi_master_gpio *master = to_fsi_master_gpio(_master); + struct fsi_gpio_msg cmd; + + if (link != 0) + return -ENODEV; + + build_abs_ar_command(&cmd, id, addr, size, NULL); + return fsi_master_gpio_xfer(master, id, &cmd, size, val); +} + +static int fsi_master_gpio_write(struct fsi_master *_master, int link, + uint8_t id, uint32_t addr, const void *val, size_t size) +{ + struct fsi_master_gpio *master = to_fsi_master_gpio(_master); + struct fsi_gpio_msg cmd; + + if (link != 0) + return -ENODEV; + + build_abs_ar_command(&cmd, id, addr, size, val); + return fsi_master_gpio_xfer(master, id, &cmd, 0, NULL); +} + +static int fsi_master_gpio_term(struct fsi_master *_master, + int link, uint8_t id) +{ + struct fsi_master_gpio *master = to_fsi_master_gpio(_master); + struct fsi_gpio_msg cmd; + + if (link != 0) + return -ENODEV; + + build_term_command(&cmd, id); + return fsi_master_gpio_xfer(master, id, &cmd, 0, NULL); +} + +static int fsi_master_gpio_break(struct fsi_master *_master, int link) +{ + struct fsi_master_gpio *master = to_fsi_master_gpio(_master); + + if (link != 0) + return -ENODEV; + + set_sda_output(master, 1); + sda_out(master, 1); + clock_toggle(master, FSI_PRE_BREAK_CLOCKS); + sda_out(master, 0); + clock_toggle(master, FSI_BREAK_CLOCKS); + echo_delay(master); + sda_out(master, 1); + clock_toggle(master, FSI_POST_BREAK_CLOCKS); + + /* Wait for logic reset to take effect */ + udelay(200); + + return 0; +} + +static void fsi_master_gpio_init(struct fsi_master_gpio *master) +{ + gpiod_direction_output(master->gpio_mux, 1); + gpiod_direction_output(master->gpio_trans, 1); + gpiod_direction_output(master->gpio_enable, 1); + gpiod_direction_output(master->gpio_clk, 1); + gpiod_direction_output(master->gpio_data, 1); + + /* todo: evaluate if clocks can be reduced */ + clock_zeros(master, FSI_INIT_CLOCKS); +} + +static int fsi_master_gpio_link_enable(struct fsi_master *_master, int link) +{ + struct fsi_master_gpio *master = to_fsi_master_gpio(_master); + + if (link != 0) + return -ENODEV; + gpiod_set_value(master->gpio_enable, 1); + + return 0; +} + +static int fsi_master_gpio_probe(struct platform_device *pdev) +{ + struct fsi_master_gpio *master; + struct gpio_desc *gpio; + + master = devm_kzalloc(&pdev->dev, sizeof(*master), GFP_KERNEL); + if (!master) + return -ENOMEM; + + master->dev = &pdev->dev; + master->master.dev.parent = master->dev; + + gpio = devm_gpiod_get(&pdev->dev, "clock", 0); + if (IS_ERR(gpio)) { + dev_err(&pdev->dev, "failed to get clock gpio\n"); + return PTR_ERR(gpio); + } + master->gpio_clk = gpio; + + gpio = devm_gpiod_get(&pdev->dev, "data", 0); + if (IS_ERR(gpio)) { + dev_err(&pdev->dev, "failed to get data gpio\n"); + return PTR_ERR(gpio); + } + master->gpio_data = gpio; + + /* Optional GPIOs */ + gpio = devm_gpiod_get_optional(&pdev->dev, "trans", 0); + if (IS_ERR(gpio)) { + dev_err(&pdev->dev, "failed to get trans gpio\n"); + return PTR_ERR(gpio); + } + master->gpio_trans = gpio; + + gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 0); + if (IS_ERR(gpio)) { + dev_err(&pdev->dev, "failed to get enable gpio\n"); + return PTR_ERR(gpio); + } + master->gpio_enable = gpio; + + gpio = devm_gpiod_get_optional(&pdev->dev, "mux", 0); + if (IS_ERR(gpio)) { + dev_err(&pdev->dev, "failed to get mux gpio\n"); + return PTR_ERR(gpio); + } + master->gpio_mux = gpio; + + master->master.n_links = 1; + master->master.read = fsi_master_gpio_read; + master->master.write = fsi_master_gpio_write; + master->master.term = fsi_master_gpio_term; + master->master.send_break = fsi_master_gpio_break; + master->master.link_enable = fsi_master_gpio_link_enable; + platform_set_drvdata(pdev, master); + spin_lock_init(&master->cmd_lock); + + fsi_master_gpio_init(master); + + return fsi_master_register(&master->master); +} + + +static int fsi_master_gpio_remove(struct platform_device *pdev) +{ + struct fsi_master_gpio *master = platform_get_drvdata(pdev); + + devm_gpiod_put(&pdev->dev, master->gpio_clk); + devm_gpiod_put(&pdev->dev, master->gpio_data); + if (master->gpio_trans) + devm_gpiod_put(&pdev->dev, master->gpio_trans); + if (master->gpio_enable) + devm_gpiod_put(&pdev->dev, master->gpio_enable); + if (master->gpio_mux) + devm_gpiod_put(&pdev->dev, master->gpio_mux); + fsi_master_unregister(&master->master); + + return 0; +} + +static const struct of_device_id fsi_master_gpio_match[] = { + { .compatible = "fsi-master-gpio" }, + { }, +}; + +static struct platform_driver fsi_master_gpio_driver = { + .driver = { + .name = "fsi-master-gpio", + .of_match_table = fsi_master_gpio_match, + }, + .probe = fsi_master_gpio_probe, + .remove = fsi_master_gpio_remove, +}; + +module_platform_driver(fsi_master_gpio_driver); +MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 1247cf7ab876b6f1da7028bff64b3d89130dd8e3 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:55 -0500 Subject: drivers/fsi/gpio: Add tracepoints for GPIO master Trace low level input/output GPIO operations. Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-master-gpio.c | 9 +++++ include/trace/events/fsi_master_gpio.h | 68 ++++++++++++++++++++++++++++++++++ 2 files changed, 77 insertions(+) create mode 100644 include/trace/events/fsi_master_gpio.h diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c index d467e61065a9..a5d6e705b3c5 100644 --- a/drivers/fsi/fsi-master-gpio.c +++ b/drivers/fsi/fsi-master-gpio.c @@ -61,6 +61,9 @@ struct fsi_master_gpio { struct gpio_desc *gpio_mux; /* Mux control */ }; +#define CREATE_TRACE_POINTS +#include + #define to_fsi_master_gpio(m) container_of(m, struct fsi_master_gpio, master) struct fsi_gpio_msg { @@ -126,6 +129,8 @@ static void serial_in(struct fsi_master_gpio *master, struct fsi_gpio_msg *msg, msg->msg |= ~in_bit & 0x1; /* Data is active low */ } msg->bits += num_bits; + + trace_fsi_master_gpio_in(master, num_bits, msg->msg); } static void serial_out(struct fsi_master_gpio *master, @@ -137,6 +142,8 @@ static void serial_out(struct fsi_master_gpio *master, uint64_t last_bit = ~0; int next_bit; + trace_fsi_master_gpio_out(master, cmd->bits, cmd->msg); + if (!cmd->bits) { dev_warn(master->dev, "trying to output 0 bits\n"); return; @@ -458,6 +465,8 @@ static int fsi_master_gpio_break(struct fsi_master *_master, int link) if (link != 0) return -ENODEV; + trace_fsi_master_gpio_break(master); + set_sda_output(master, 1); sda_out(master, 1); clock_toggle(master, FSI_PRE_BREAK_CLOCKS); diff --git a/include/trace/events/fsi_master_gpio.h b/include/trace/events/fsi_master_gpio.h new file mode 100644 index 000000000000..11b36c119048 --- /dev/null +++ b/include/trace/events/fsi_master_gpio.h @@ -0,0 +1,68 @@ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM fsi_master_gpio + +#if !defined(_TRACE_FSI_MASTER_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_FSI_MASTER_GPIO_H + +#include + +TRACE_EVENT(fsi_master_gpio_in, + TP_PROTO(const struct fsi_master_gpio *master, int bits, uint64_t msg), + TP_ARGS(master, bits, msg), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, bits) + __field(uint64_t, msg) + ), + TP_fast_assign( + __entry->master_idx = master->master.idx; + __entry->bits = bits; + __entry->msg = msg & ((1ull< %0*llx[%d]", + __entry->master_idx, + (__entry->bits + 3) / 4, + __entry->msg, + __entry->bits + ) +); + +TRACE_EVENT(fsi_master_gpio_out, + TP_PROTO(const struct fsi_master_gpio *master, int bits, uint64_t msg), + TP_ARGS(master, bits, msg), + TP_STRUCT__entry( + __field(int, master_idx) + __field(int, bits) + __field(uint64_t, msg) + ), + TP_fast_assign( + __entry->master_idx = master->master.idx; + __entry->bits = bits; + __entry->msg = msg & ((1ull<master_idx, + (__entry->bits + 3) / 4, + __entry->msg, + __entry->bits + ) +); + +TRACE_EVENT(fsi_master_gpio_break, + TP_PROTO(const struct fsi_master_gpio *master), + TP_ARGS(master), + TP_STRUCT__entry( + __field(int, master_idx) + ), + TP_fast_assign( + __entry->master_idx = master->master.idx; + ), + TP_printk("fsi-gpio%d ----break---", + __entry->master_idx + ) +); + +#endif /* _TRACE_FSI_MASTER_GPIO_H */ + +#include -- cgit v1.2.3 From 680ca6dcf5c222765cb2fb22959c5282865b6655 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:56 -0500 Subject: drivers/fsi: Add SCOM FSI client device driver Create a simple SCOM engine device driver that reads and writes its control registers via an FSI bus. Includes changes from Edward A. James . Signed-off-by: Christopher Bostic Signed-off-by: Joel Stanley Signed-off-by: Edward A. James Signed-off-by: Jeremy Kerr Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/Kconfig | 5 + drivers/fsi/Makefile | 1 + drivers/fsi/fsi-scom.c | 263 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 269 insertions(+) create mode 100644 drivers/fsi/fsi-scom.c diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index ba1663754f8a..558252336932 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -20,6 +20,11 @@ config FSI_MASTER_GPIO ---help--- This option enables a FSI master driver using GPIO lines. +config FSI_SCOM + tristate "SCOM FSI client device driver" + ---help--- + This option enables an FSI based SCOM device driver. + endif endmenu diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile index ed28ac016de6..3466f08f9aba 100644 --- a/drivers/fsi/Makefile +++ b/drivers/fsi/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_FSI) += fsi-core.o obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o +obj-$(CONFIG_FSI_SCOM) += fsi-scom.o diff --git a/drivers/fsi/fsi-scom.c b/drivers/fsi/fsi-scom.c new file mode 100644 index 000000000000..98d062fd353e --- /dev/null +++ b/drivers/fsi/fsi-scom.c @@ -0,0 +1,263 @@ +/* + * SCOM FSI Client device driver + * + * Copyright (C) IBM Corporation 2016 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERGCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define FSI_ENGID_SCOM 0x5 + +#define SCOM_FSI2PIB_DELAY 50 + +/* SCOM engine register set */ +#define SCOM_DATA0_REG 0x00 +#define SCOM_DATA1_REG 0x04 +#define SCOM_CMD_REG 0x08 +#define SCOM_RESET_REG 0x1C + +#define SCOM_RESET_CMD 0x80000000 +#define SCOM_WRITE_CMD 0x80000000 + +struct scom_device { + struct list_head link; + struct fsi_device *fsi_dev; + struct miscdevice mdev; + char name[32]; + int idx; +}; + +#define to_scom_dev(x) container_of((x), struct scom_device, mdev) + +static struct list_head scom_devices; + +static DEFINE_IDA(scom_ida); + +static int put_scom(struct scom_device *scom_dev, uint64_t value, + uint32_t addr) +{ + int rc; + uint32_t data; + + data = cpu_to_be32(SCOM_RESET_CMD); + rc = fsi_device_write(scom_dev->fsi_dev, SCOM_RESET_REG, &data, + sizeof(uint32_t)); + if (rc) + return rc; + + data = cpu_to_be32((value >> 32) & 0xffffffff); + rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA0_REG, &data, + sizeof(uint32_t)); + if (rc) + return rc; + + data = cpu_to_be32(value & 0xffffffff); + rc = fsi_device_write(scom_dev->fsi_dev, SCOM_DATA1_REG, &data, + sizeof(uint32_t)); + if (rc) + return rc; + + data = cpu_to_be32(SCOM_WRITE_CMD | addr); + return fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data, + sizeof(uint32_t)); +} + +static int get_scom(struct scom_device *scom_dev, uint64_t *value, + uint32_t addr) +{ + uint32_t result, data; + int rc; + + *value = 0ULL; + data = cpu_to_be32(addr); + rc = fsi_device_write(scom_dev->fsi_dev, SCOM_CMD_REG, &data, + sizeof(uint32_t)); + if (rc) + return rc; + + rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA0_REG, &result, + sizeof(uint32_t)); + if (rc) + return rc; + + *value |= (uint64_t)cpu_to_be32(result) << 32; + rc = fsi_device_read(scom_dev->fsi_dev, SCOM_DATA1_REG, &result, + sizeof(uint32_t)); + if (rc) + return rc; + + *value |= cpu_to_be32(result); + + return 0; +} + +static ssize_t scom_read(struct file *filep, char __user *buf, size_t len, + loff_t *offset) +{ + int rc; + struct miscdevice *mdev = + (struct miscdevice *)filep->private_data; + struct scom_device *scom = to_scom_dev(mdev); + struct device *dev = &scom->fsi_dev->dev; + uint64_t val; + + if (len != sizeof(uint64_t)) + return -EINVAL; + + rc = get_scom(scom, &val, *offset); + if (rc) { + dev_dbg(dev, "get_scom fail:%d\n", rc); + return rc; + } + + rc = copy_to_user(buf, &val, len); + if (rc) + dev_dbg(dev, "copy to user failed:%d\n", rc); + + return rc ? rc : len; +} + +static ssize_t scom_write(struct file *filep, const char __user *buf, + size_t len, loff_t *offset) +{ + int rc; + struct miscdevice *mdev = filep->private_data; + struct scom_device *scom = to_scom_dev(mdev); + struct device *dev = &scom->fsi_dev->dev; + uint64_t val; + + if (len != sizeof(uint64_t)) + return -EINVAL; + + rc = copy_from_user(&val, buf, len); + if (rc) { + dev_dbg(dev, "copy from user failed:%d\n", rc); + return -EINVAL; + } + + rc = put_scom(scom, val, *offset); + if (rc) { + dev_dbg(dev, "put_scom failed with:%d\n", rc); + return rc; + } + + return len; +} + +static loff_t scom_llseek(struct file *file, loff_t offset, int whence) +{ + switch (whence) { + case SEEK_CUR: + break; + case SEEK_SET: + file->f_pos = offset; + break; + default: + return -EINVAL; + } + + return offset; +} + +static const struct file_operations scom_fops = { + .owner = THIS_MODULE, + .llseek = scom_llseek, + .read = scom_read, + .write = scom_write, +}; + +static int scom_probe(struct device *dev) +{ + struct fsi_device *fsi_dev = to_fsi_dev(dev); + struct scom_device *scom; + + scom = devm_kzalloc(dev, sizeof(*scom), GFP_KERNEL); + if (!scom) + return -ENOMEM; + + scom->idx = ida_simple_get(&scom_ida, 1, INT_MAX, GFP_KERNEL); + snprintf(scom->name, sizeof(scom->name), "scom%d", scom->idx); + scom->fsi_dev = fsi_dev; + scom->mdev.minor = MISC_DYNAMIC_MINOR; + scom->mdev.fops = &scom_fops; + scom->mdev.name = scom->name; + scom->mdev.parent = dev; + list_add(&scom->link, &scom_devices); + + return misc_register(&scom->mdev); +} + +static int scom_remove(struct device *dev) +{ + struct scom_device *scom, *scom_tmp; + struct fsi_device *fsi_dev = to_fsi_dev(dev); + + list_for_each_entry_safe(scom, scom_tmp, &scom_devices, link) { + if (scom->fsi_dev == fsi_dev) { + list_del(&scom->link); + ida_simple_remove(&scom_ida, scom->idx); + misc_deregister(&scom->mdev); + } + } + + return 0; +} + +static struct fsi_device_id scom_ids[] = { + { + .engine_type = FSI_ENGID_SCOM, + .version = FSI_VERSION_ANY, + }, + { 0 } +}; + +static struct fsi_driver scom_drv = { + .id_table = scom_ids, + .drv = { + .name = "scom", + .bus = &fsi_bus_type, + .probe = scom_probe, + .remove = scom_remove, + } +}; + +static int scom_init(void) +{ + INIT_LIST_HEAD(&scom_devices); + return fsi_driver_register(&scom_drv); +} + +static void scom_exit(void) +{ + struct list_head *pos; + struct scom_device *scom; + + list_for_each(pos, &scom_devices) { + scom = list_entry(pos, struct scom_device, link); + misc_deregister(&scom->mdev); + devm_kfree(&scom->fsi_dev->dev, scom); + } + fsi_driver_unregister(&scom_drv); +} + +module_init(scom_init); +module_exit(scom_exit); +MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 7f9e8f767030e9d588ffc71e50ebf5164c86c8a9 Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:57 -0500 Subject: drivers/fsi: Add hub master support Add an engine driver to expose a "hub" FSI master - which has a set of control registers in the engine address space, and uses a chunk of the slave address space for actual FSI communication. Additional changes from Jeremy Kerr . Signed-off-by: Christopher Bostic Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/Kconfig | 8 ++ drivers/fsi/Makefile | 1 + drivers/fsi/fsi-master-hub.c | 327 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 336 insertions(+) create mode 100644 drivers/fsi/fsi-master-hub.c diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index 558252336932..6821ed0cd5e8 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -20,6 +20,14 @@ config FSI_MASTER_GPIO ---help--- This option enables a FSI master driver using GPIO lines. +config FSI_MASTER_HUB + tristate "FSI hub master" + ---help--- + This option enables a FSI hub master driver. Hub is a type of FSI + master that is connected to the upstream master via a slave. Hubs + allow chaining of FSI links to an arbitrary depth. This allows for + a high target device fanout. + config FSI_SCOM tristate "SCOM FSI client device driver" ---help--- diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile index 3466f08f9aba..65eb99dfafdb 100644 --- a/drivers/fsi/Makefile +++ b/drivers/fsi/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_FSI) += fsi-core.o +obj-$(CONFIG_FSI_MASTER_HUB) += fsi-master-hub.o obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o obj-$(CONFIG_FSI_SCOM) += fsi-scom.o diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c new file mode 100644 index 000000000000..133b9bff1d65 --- /dev/null +++ b/drivers/fsi/fsi-master-hub.c @@ -0,0 +1,327 @@ +/* + * FSI hub master driver + * + * Copyright (C) IBM Corporation 2016 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include + +#include "fsi-master.h" + +/* Control Registers */ +#define FSI_MMODE 0x0 /* R/W: mode */ +#define FSI_MDLYR 0x4 /* R/W: delay */ +#define FSI_MCRSP 0x8 /* R/W: clock rate */ +#define FSI_MENP0 0x10 /* R/W: enable */ +#define FSI_MLEVP0 0x18 /* R: plug detect */ +#define FSI_MSENP0 0x18 /* S: Set enable */ +#define FSI_MCENP0 0x20 /* C: Clear enable */ +#define FSI_MAEB 0x70 /* R: Error address */ +#define FSI_MVER 0x74 /* R: master version/type */ +#define FSI_MRESP0 0xd0 /* W: Port reset */ +#define FSI_MESRB0 0x1d0 /* R: Master error status */ +#define FSI_MRESB0 0x1d0 /* W: Reset bridge */ +#define FSI_MECTRL 0x2e0 /* W: Error control */ + +/* MMODE: Mode control */ +#define FSI_MMODE_EIP 0x80000000 /* Enable interrupt polling */ +#define FSI_MMODE_ECRC 0x40000000 /* Enable error recovery */ +#define FSI_MMODE_EPC 0x10000000 /* Enable parity checking */ +#define FSI_MMODE_P8_TO_LSB 0x00000010 /* Timeout value LSB */ + /* MSB=1, LSB=0 is 0.8 ms */ + /* MSB=0, LSB=1 is 0.9 ms */ +#define FSI_MMODE_CRS0SHFT 18 /* Clk rate selection 0 shift */ +#define FSI_MMODE_CRS0MASK 0x3ff /* Clk rate selection 0 mask */ +#define FSI_MMODE_CRS1SHFT 8 /* Clk rate selection 1 shift */ +#define FSI_MMODE_CRS1MASK 0x3ff /* Clk rate selection 1 mask */ + +/* MRESB: Reset brindge */ +#define FSI_MRESB_RST_GEN 0x80000000 /* General reset */ +#define FSI_MRESB_RST_ERR 0x40000000 /* Error Reset */ + +/* MRESB: Reset port */ +#define FSI_MRESP_RST_ALL_MASTER 0x20000000 /* Reset all FSI masters */ +#define FSI_MRESP_RST_ALL_LINK 0x10000000 /* Reset all FSI port contr. */ +#define FSI_MRESP_RST_MCR 0x08000000 /* Reset FSI master reg. */ +#define FSI_MRESP_RST_PYE 0x04000000 /* Reset FSI parity error */ +#define FSI_MRESP_RST_ALL 0xfc000000 /* Reset any error */ + +/* MECTRL: Error control */ +#define FSI_MECTRL_EOAE 0x8000 /* Enable machine check when */ + /* master 0 in error */ +#define FSI_MECTRL_P8_AUTO_TERM 0x4000 /* Auto terminate */ + +#define FSI_ENGID_HUB_MASTER 0x1c +#define FSI_HUB_LINK_OFFSET 0x80000 +#define FSI_HUB_LINK_SIZE 0x80000 +#define FSI_HUB_MASTER_MAX_LINKS 8 + +#define FSI_LINK_ENABLE_SETUP_TIME 10 /* in mS */ + +/* + * FSI hub master support + * + * A hub master increases the number of potential target devices that the + * primary FSI master can access. For each link a primary master supports, + * each of those links can in turn be chained to a hub master with multiple + * links of its own. + * + * The hub is controlled by a set of control registers exposed as a regular fsi + * device (the hub->upstream device), and provides access to the downstream FSI + * bus as through an address range on the slave itself (->addr and ->size). + * + * [This differs from "cascaded" masters, which expose the entire downstream + * bus entirely through the fsi device address range, and so have a smaller + * accessible address space.] + */ +struct fsi_master_hub { + struct fsi_master master; + struct fsi_device *upstream; + uint32_t addr, size; /* slave-relative addr of */ + /* master address space */ +}; + +#define to_fsi_master_hub(m) container_of(m, struct fsi_master_hub, master) + +static int hub_master_read(struct fsi_master *master, int link, + uint8_t id, uint32_t addr, void *val, size_t size) +{ + struct fsi_master_hub *hub = to_fsi_master_hub(master); + + if (id != 0) + return -EINVAL; + + addr += hub->addr + (link * FSI_HUB_LINK_SIZE); + return fsi_slave_read(hub->upstream->slave, addr, val, size); +} + +static int hub_master_write(struct fsi_master *master, int link, + uint8_t id, uint32_t addr, const void *val, size_t size) +{ + struct fsi_master_hub *hub = to_fsi_master_hub(master); + + if (id != 0) + return -EINVAL; + + addr += hub->addr + (link * FSI_HUB_LINK_SIZE); + return fsi_slave_write(hub->upstream->slave, addr, val, size); +} + +static int hub_master_break(struct fsi_master *master, int link) +{ + uint32_t addr, cmd; + + addr = 0x4; + cmd = cpu_to_be32(0xc0de0000); + + return hub_master_write(master, link, 0, addr, &cmd, sizeof(cmd)); +} + +static int hub_master_link_enable(struct fsi_master *master, int link) +{ + struct fsi_master_hub *hub = to_fsi_master_hub(master); + int idx, bit; + __be32 reg; + int rc; + + idx = link / 32; + bit = link % 32; + + reg = cpu_to_be32(0x80000000 >> bit); + + rc = fsi_device_write(hub->upstream, FSI_MSENP0 + (4 * idx), ®, 4); + + mdelay(FSI_LINK_ENABLE_SETUP_TIME); + + fsi_device_read(hub->upstream, FSI_MENP0 + (4 * idx), ®, 4); + + return rc; +} + +static void hub_master_release(struct device *dev) +{ + struct fsi_master_hub *hub = to_fsi_master_hub(dev_to_fsi_master(dev)); + + kfree(hub); +} + +/* mmode encoders */ +static inline u32 fsi_mmode_crs0(u32 x) +{ + return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT; +} + +static inline u32 fsi_mmode_crs1(u32 x) +{ + return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT; +} + +static int hub_master_init(struct fsi_master_hub *hub) +{ + struct fsi_device *dev = hub->upstream; + __be32 reg; + int rc; + + reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK + | FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE); + rc = fsi_device_write(dev, FSI_MRESP0, ®, sizeof(reg)); + if (rc) + return rc; + + /* Initialize the MFSI (hub master) engine */ + reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK + | FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE); + rc = fsi_device_write(dev, FSI_MRESP0, ®, sizeof(reg)); + if (rc) + return rc; + + reg = cpu_to_be32(FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM); + rc = fsi_device_write(dev, FSI_MECTRL, ®, sizeof(reg)); + if (rc) + return rc; + + reg = cpu_to_be32(FSI_MMODE_EIP | FSI_MMODE_ECRC | FSI_MMODE_EPC + | fsi_mmode_crs0(1) | fsi_mmode_crs1(1) + | FSI_MMODE_P8_TO_LSB); + rc = fsi_device_write(dev, FSI_MMODE, ®, sizeof(reg)); + if (rc) + return rc; + + reg = cpu_to_be32(0xffff0000); + rc = fsi_device_write(dev, FSI_MDLYR, ®, sizeof(reg)); + if (rc) + return rc; + + reg = ~0; + rc = fsi_device_write(dev, FSI_MSENP0, ®, sizeof(reg)); + if (rc) + return rc; + + /* Leave enabled long enough for master logic to set up */ + mdelay(FSI_LINK_ENABLE_SETUP_TIME); + + rc = fsi_device_write(dev, FSI_MCENP0, ®, sizeof(reg)); + if (rc) + return rc; + + rc = fsi_device_read(dev, FSI_MAEB, ®, sizeof(reg)); + if (rc) + return rc; + + reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK); + rc = fsi_device_write(dev, FSI_MRESP0, ®, sizeof(reg)); + if (rc) + return rc; + + rc = fsi_device_read(dev, FSI_MLEVP0, ®, sizeof(reg)); + if (rc) + return rc; + + /* Reset the master bridge */ + reg = cpu_to_be32(FSI_MRESB_RST_GEN); + rc = fsi_device_write(dev, FSI_MRESB0, ®, sizeof(reg)); + if (rc) + return rc; + + reg = cpu_to_be32(FSI_MRESB_RST_ERR); + return fsi_device_write(dev, FSI_MRESB0, ®, sizeof(reg)); +} + +static int hub_master_probe(struct device *dev) +{ + struct fsi_device *fsi_dev = to_fsi_dev(dev); + struct fsi_master_hub *hub; + uint32_t reg, links; + __be32 __reg; + int rc; + + rc = fsi_device_read(fsi_dev, FSI_MVER, &__reg, sizeof(__reg)); + if (rc) + return rc; + + reg = be32_to_cpu(__reg); + links = (reg >> 8) & 0xff; + dev_info(dev, "hub version %08x (%d links)\n", reg, links); + + rc = fsi_slave_claim_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET, + FSI_HUB_LINK_SIZE * links); + if (rc) { + dev_err(dev, "can't claim slave address range for links"); + return rc; + } + + hub = kzalloc(sizeof(*hub), GFP_KERNEL); + if (!hub) { + rc = -ENOMEM; + goto err_release; + } + + hub->addr = FSI_HUB_LINK_OFFSET; + hub->size = FSI_HUB_LINK_SIZE * links; + hub->upstream = fsi_dev; + + hub->master.dev.parent = dev; + hub->master.dev.release = hub_master_release; + + hub->master.n_links = links; + hub->master.read = hub_master_read; + hub->master.write = hub_master_write; + hub->master.send_break = hub_master_break; + hub->master.link_enable = hub_master_link_enable; + + dev_set_drvdata(dev, hub); + + hub_master_init(hub); + + rc = fsi_master_register(&hub->master); + if (!rc) + return 0; + + kfree(hub); +err_release: + fsi_slave_release_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET, + FSI_HUB_LINK_SIZE * links); + return rc; +} + +static int hub_master_remove(struct device *dev) +{ + struct fsi_master_hub *hub = dev_get_drvdata(dev); + + fsi_master_unregister(&hub->master); + fsi_slave_release_range(hub->upstream->slave, hub->addr, hub->size); + return 0; +} + +static struct fsi_device_id hub_master_ids[] = { + { + .engine_type = FSI_ENGID_HUB_MASTER, + .version = FSI_VERSION_ANY, + }, + { 0 } +}; + +static struct fsi_driver hub_master_driver = { + .id_table = hub_master_ids, + .drv = { + .name = "fsi-master-hub", + .bus = &fsi_bus_type, + .probe = hub_master_probe, + .remove = hub_master_remove, + } +}; + +module_fsi_driver(hub_master_driver); +MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 4af889b0ff78a71a0d5e3d4ce62515eca2ba4939 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Tue, 6 Jun 2017 16:08:58 -0500 Subject: drivers/fsi: Use asynchronous slave mode For slaves that are behind a software-clocked master, we want FSI CFAMs to run asynchronously to the FSI clock, so set up our slaves to be in async mode. Signed-off-by: Jeremy Kerr Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 22 +++++++++++++++++++++- drivers/fsi/fsi-master-gpio.c | 1 + drivers/fsi/fsi-master.h | 2 ++ 3 files changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index c9ff8d3b3f03..b56f4ed5c488 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -49,6 +49,7 @@ static const int engine_page_size = 0x400; #define FSI_SMODE 0x0 /* R/W: Mode register */ #define FSI_SISC 0x8 /* R/W: Interrupt condition */ #define FSI_SSTAT 0x14 /* R : Slave status */ +#define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ /* * SMODE fields @@ -64,6 +65,11 @@ static const int engine_page_size = 0x400; #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ +/* + * LLMODE fields + */ +#define FSI_LLMODE_ASYNC 0x1 + #define FSI_SLAVE_SIZE_23b 0x800000 static DEFINE_IDA(master_ida); @@ -557,8 +563,8 @@ static void fsi_slave_release(struct device *dev) static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) { + uint32_t chip_id, llmode; struct fsi_slave *slave; - uint32_t chip_id; uint8_t crc; int rc; @@ -594,6 +600,20 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) return -ENODEV; } + /* If we're behind a master that doesn't provide a self-running bus + * clock, put the slave into async mode + */ + if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { + llmode = cpu_to_be32(FSI_LLMODE_ASYNC); + rc = fsi_master_write(master, link, id, + FSI_SLAVE_BASE + FSI_LLMODE, + &llmode, sizeof(llmode)); + if (rc) + dev_warn(&master->dev, + "can't set llmode on slave:%02x:%02x %d\n", + link, id, rc); + } + /* We can communicate with a slave; create the slave device and * register. */ diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c index a5d6e705b3c5..ae2618768508 100644 --- a/drivers/fsi/fsi-master-gpio.c +++ b/drivers/fsi/fsi-master-gpio.c @@ -554,6 +554,7 @@ static int fsi_master_gpio_probe(struct platform_device *pdev) master->gpio_mux = gpio; master->master.n_links = 1; + master->master.flags = FSI_MASTER_FLAG_SWCLOCK; master->master.read = fsi_master_gpio_read; master->master.write = fsi_master_gpio_write; master->master.term = fsi_master_gpio_term; diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h index 7764b0079d28..12f7b119567d 100644 --- a/drivers/fsi/fsi-master.h +++ b/drivers/fsi/fsi-master.h @@ -19,6 +19,8 @@ #include +#define FSI_MASTER_FLAG_SWCLOCK 0x1 + struct fsi_master { struct device dev; int idx; -- cgit v1.2.3 From acb7e8f7448efef4ba1d86247cacbd201df733ab Mon Sep 17 00:00:00 2001 From: Christopher Bostic Date: Tue, 6 Jun 2017 16:08:59 -0500 Subject: drivers/fsi: Add module license to core driver Add missing MODULE_LICENSE("GPL") to the core FSI driver. Signed-off-by: Christopher Bostic Signed-off-by: Greg Kroah-Hartman --- drivers/fsi/fsi-core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index b56f4ed5c488..a485864cb512 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -896,4 +896,5 @@ static void fsi_exit(void) module_init(fsi_init); module_exit(fsi_exit); module_param(discard_errors, int, 0664); +MODULE_LICENSE("GPL"); MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); -- cgit v1.2.3 From de0d6dbdbdb23ddb85f10d54a516e794f9a873e0 Mon Sep 17 00:00:00 2001 From: "Andrew F. Davis" Date: Mon, 5 Jun 2017 08:52:08 -0500 Subject: w1: Add subsystem kernel public interface Like other subsystems we should be able to define slave devices outside of the w1 directory. To do this we move public facing interface definitions to include/linux/w1.h and rename the internal definition file to w1_internal.h. As w1_family.h and w1_int.h contained almost entirely public driver interface definitions we simply removed these files and moved the remaining definitions into w1_internal.h. With this we can now start to move slave devices out of w1/slaves and into the subsystem based on the function they implement, again like other drivers. Signed-off-by: Andrew F. Davis Reviewed-by: Sebastian Reichel Acked-by: Evgeniy Polyakov Signed-off-by: Greg Kroah-Hartman --- MAINTAINERS | 1 + drivers/power/supply/ds2760_battery.c | 2 +- drivers/power/supply/ds2780_battery.c | 2 +- drivers/power/supply/ds2781_battery.c | 2 +- drivers/w1/masters/ds1wm.c | 3 +- drivers/w1/masters/ds2482.c | 3 +- drivers/w1/masters/ds2490.c | 3 +- drivers/w1/masters/matrox_w1.c | 3 +- drivers/w1/masters/mxc_w1.c | 3 +- drivers/w1/masters/omap_hdq.c | 3 +- drivers/w1/masters/w1-gpio.c | 3 +- drivers/w1/slaves/w1_bq27000.c | 6 +- drivers/w1/slaves/w1_ds2405.c | 5 +- drivers/w1/slaves/w1_ds2406.c | 6 +- drivers/w1/slaves/w1_ds2408.c | 6 +- drivers/w1/slaves/w1_ds2413.c | 6 +- drivers/w1/slaves/w1_ds2423.c | 6 +- drivers/w1/slaves/w1_ds2431.c | 6 +- drivers/w1/slaves/w1_ds2433.c | 6 +- drivers/w1/slaves/w1_ds2438.c | 5 +- drivers/w1/slaves/w1_ds2760.c | 7 +- drivers/w1/slaves/w1_ds2780.c | 7 +- drivers/w1/slaves/w1_ds2781.c | 7 +- drivers/w1/slaves/w1_ds28e04.c | 6 +- drivers/w1/slaves/w1_smem.c | 7 +- drivers/w1/slaves/w1_therm.c | 10 +- drivers/w1/w1.c | 6 +- drivers/w1/w1.h | 336 ---------------------------------- drivers/w1/w1_family.c | 3 +- drivers/w1/w1_family.h | 98 ---------- drivers/w1/w1_int.c | 3 +- drivers/w1/w1_int.h | 27 --- drivers/w1/w1_internal.h | 87 +++++++++ drivers/w1/w1_io.c | 2 +- drivers/w1/w1_netlink.c | 2 +- drivers/w1/w1_netlink.h | 2 +- include/linux/w1.h | 320 ++++++++++++++++++++++++++++++++ 37 files changed, 479 insertions(+), 531 deletions(-) delete mode 100644 drivers/w1/w1.h delete mode 100644 drivers/w1/w1_family.h delete mode 100644 drivers/w1/w1_int.h create mode 100644 drivers/w1/w1_internal.h create mode 100644 include/linux/w1.h diff --git a/MAINTAINERS b/MAINTAINERS index 2dc114b9e7f7..2461e78b173f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13790,6 +13790,7 @@ M: Evgeniy Polyakov S: Maintained F: Documentation/w1/ F: drivers/w1/ +F: include/linux/w1.h W83791D HARDWARE MONITORING DRIVER M: Marc Hulsman diff --git a/drivers/power/supply/ds2760_battery.c b/drivers/power/supply/ds2760_battery.c index 17225689e3f6..ae180dc929c9 100644 --- a/drivers/power/supply/ds2760_battery.c +++ b/drivers/power/supply/ds2760_battery.c @@ -28,7 +28,7 @@ #include #include -#include "../../w1/w1.h" +#include #include "../../w1/slaves/w1_ds2760.h" struct ds2760_device_info { diff --git a/drivers/power/supply/ds2780_battery.c b/drivers/power/supply/ds2780_battery.c index 1b3b6fa89c28..8edd4aa5f475 100644 --- a/drivers/power/supply/ds2780_battery.c +++ b/drivers/power/supply/ds2780_battery.c @@ -21,7 +21,7 @@ #include #include -#include "../../w1/w1.h" +#include #include "../../w1/slaves/w1_ds2780.h" /* Current unit measurement in uA for a 1 milli-ohm sense resistor */ diff --git a/drivers/power/supply/ds2781_battery.c b/drivers/power/supply/ds2781_battery.c index cc0149131f89..4400402f9ec5 100644 --- a/drivers/power/supply/ds2781_battery.c +++ b/drivers/power/supply/ds2781_battery.c @@ -19,7 +19,7 @@ #include #include -#include "../../w1/w1.h" +#include #include "../../w1/slaves/w1_ds2781.h" /* Current unit measurement in uA for a 1 milli-ohm sense resistor */ diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c index e0b8a4bc73df..fd2e9da27c4b 100644 --- a/drivers/w1/masters/ds1wm.c +++ b/drivers/w1/masters/ds1wm.c @@ -25,8 +25,7 @@ #include -#include "../w1.h" -#include "../w1_int.h" +#include #define DS1WM_CMD 0x00 /* R/W 4 bits command */ diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c index e8730ea3e3aa..d49681cd29af 100644 --- a/drivers/w1/masters/ds2482.c +++ b/drivers/w1/masters/ds2482.c @@ -20,8 +20,7 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" +#include /** * Allow the active pullup to be disabled, default is enabled. diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c index d748e34d4ce5..46ccb2fc4f60 100644 --- a/drivers/w1/masters/ds2490.c +++ b/drivers/w1/masters/ds2490.c @@ -25,8 +25,7 @@ #include #include -#include "../w1_int.h" -#include "../w1.h" +#include /* USB Standard */ /* USB Control request vendor type */ diff --git a/drivers/w1/masters/matrox_w1.c b/drivers/w1/masters/matrox_w1.c index f20d03ecfd1d..d83d7c99d81d 100644 --- a/drivers/w1/masters/matrox_w1.c +++ b/drivers/w1/masters/matrox_w1.c @@ -34,8 +34,7 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" +#include /* * Matrox G400 DDC registers. diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c index a4621757a47f..74f2e6e6202a 100644 --- a/drivers/w1/masters/mxc_w1.c +++ b/drivers/w1/masters/mxc_w1.c @@ -19,8 +19,7 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" +#include /* * MXC W1 Register offsets diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c index 3302cbd2344a..3612542b6044 100644 --- a/drivers/w1/masters/omap_hdq.c +++ b/drivers/w1/masters/omap_hdq.c @@ -19,8 +19,7 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" +#include #define MOD_NAME "OMAP_HDQ:" diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c index a373ae69d9f6..a90728ceec5a 100644 --- a/drivers/w1/masters/w1-gpio.c +++ b/drivers/w1/masters/w1-gpio.c @@ -20,8 +20,7 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" +#include static u8 w1_gpio_set_pullup(void *data, int delay) { diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c index d480900a28ab..8046ac45381a 100644 --- a/drivers/w1/slaves/w1_bq27000.c +++ b/drivers/w1/slaves/w1_bq27000.c @@ -17,9 +17,9 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_BQ27000 0x01 #define HDQ_CMD_READ (0) #define HDQ_CMD_WRITE (1<<7) diff --git a/drivers/w1/slaves/w1_ds2405.c b/drivers/w1/slaves/w1_ds2405.c index d5d54876cb64..42a1e81060ce 100644 --- a/drivers/w1/slaves/w1_ds2405.c +++ b/drivers/w1/slaves/w1_ds2405.c @@ -24,8 +24,9 @@ #include #include -#include "../w1.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_DS2405 0x05 MODULE_LICENSE("GPL"); MODULE_AUTHOR("Maciej S. Szmigiero "); diff --git a/drivers/w1/slaves/w1_ds2406.c b/drivers/w1/slaves/w1_ds2406.c index 709bd5e02eed..fac266366ca3 100644 --- a/drivers/w1/slaves/w1_ds2406.c +++ b/drivers/w1/slaves/w1_ds2406.c @@ -17,9 +17,9 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_DS2406 0x12 #define W1_F12_FUNC_READ_STATUS 0xAA #define W1_F12_FUNC_WRITE_STATUS 0x55 diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c index e01d2b3997bc..b535d5ec35b6 100644 --- a/drivers/w1/slaves/w1_ds2408.c +++ b/drivers/w1/slaves/w1_ds2408.c @@ -15,9 +15,9 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_DS2408 0x29 #define W1_F29_RETRIES 3 diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c index 9cc6f0bc2e95..492e3d010321 100644 --- a/drivers/w1/slaves/w1_ds2413.c +++ b/drivers/w1/slaves/w1_ds2413.c @@ -16,9 +16,9 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_DS2413 0x3A #define W1_F3A_RETRIES 3 #define W1_F3A_FUNC_PIO_ACCESS_READ 0xF5 diff --git a/drivers/w1/slaves/w1_ds2423.c b/drivers/w1/slaves/w1_ds2423.c index 306240fe496c..050407c53b16 100644 --- a/drivers/w1/slaves/w1_ds2423.c +++ b/drivers/w1/slaves/w1_ds2423.c @@ -30,9 +30,9 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_COUNTER_DS2423 0x1D #define CRC16_VALID 0xb001 #define CRC16_INIT 0 diff --git a/drivers/w1/slaves/w1_ds2431.c b/drivers/w1/slaves/w1_ds2431.c index 20182d4a4b19..5adecd3face1 100644 --- a/drivers/w1/slaves/w1_ds2431.c +++ b/drivers/w1/slaves/w1_ds2431.c @@ -16,9 +16,9 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_EEPROM_DS2431 0x2D #define W1_F2D_EEPROM_SIZE 128 #define W1_F2D_PAGE_COUNT 4 diff --git a/drivers/w1/slaves/w1_ds2433.c b/drivers/w1/slaves/w1_ds2433.c index 86c30aceea3e..75ad70cfe8e8 100644 --- a/drivers/w1/slaves/w1_ds2433.c +++ b/drivers/w1/slaves/w1_ds2433.c @@ -22,9 +22,9 @@ #endif -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_EEPROM_DS2433 0x23 #define W1_EEPROM_SIZE 512 #define W1_PAGE_COUNT 16 diff --git a/drivers/w1/slaves/w1_ds2438.c b/drivers/w1/slaves/w1_ds2438.c index 5ededb4965e1..6487fb772a20 100644 --- a/drivers/w1/slaves/w1_ds2438.c +++ b/drivers/w1/slaves/w1_ds2438.c @@ -13,8 +13,9 @@ #include #include -#include "../w1.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_DS2438 0x26 #define W1_DS2438_RETRIES 3 diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c index f35d1e2ef9bb..26168abfb8b8 100644 --- a/drivers/w1/slaves/w1_ds2760.c +++ b/drivers/w1/slaves/w1_ds2760.c @@ -18,11 +18,12 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + #include "w1_ds2760.h" +#define W1_FAMILY_DS2760 0x30 + static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count, int io) { diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c index 292972212107..a60528131154 100644 --- a/drivers/w1/slaves/w1_ds2780.c +++ b/drivers/w1/slaves/w1_ds2780.c @@ -21,11 +21,12 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + #include "w1_ds2780.h" +#define W1_FAMILY_DS2780 0x32 + static int w1_ds2780_do_io(struct device *dev, char *buf, int addr, size_t count, int io) { diff --git a/drivers/w1/slaves/w1_ds2781.c b/drivers/w1/slaves/w1_ds2781.c index a5d75067b230..645be6e0b24a 100644 --- a/drivers/w1/slaves/w1_ds2781.c +++ b/drivers/w1/slaves/w1_ds2781.c @@ -18,11 +18,12 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + #include "w1_ds2781.h" +#define W1_FAMILY_DS2781 0x3D + static int w1_ds2781_do_io(struct device *dev, char *buf, int addr, size_t count, int io) { diff --git a/drivers/w1/slaves/w1_ds28e04.c b/drivers/w1/slaves/w1_ds28e04.c index c62858c05e8f..ec234b846eb3 100644 --- a/drivers/w1/slaves/w1_ds28e04.c +++ b/drivers/w1/slaves/w1_ds28e04.c @@ -20,9 +20,9 @@ #define CRC16_INIT 0 #define CRC16_VALID 0xb001 -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_DS28E04 0x1C /* Allow the strong pullup to be disabled, but default to enabled. * If it was disabled a parasite powered device might not get the required diff --git a/drivers/w1/slaves/w1_smem.c b/drivers/w1/slaves/w1_smem.c index 99b03bfb9941..e556b0caff71 100644 --- a/drivers/w1/slaves/w1_smem.c +++ b/drivers/w1/slaves/w1_smem.c @@ -27,9 +27,10 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_FAMILY_SMEM_01 0x01 +#define W1_FAMILY_SMEM_81 0x81 static struct w1_family w1_smem_family_01 = { .fid = W1_FAMILY_SMEM_01, diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index ccaf29994a42..cb3fc3c6b0d1 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -30,9 +30,13 @@ #include #include -#include "../w1.h" -#include "../w1_int.h" -#include "../w1_family.h" +#include + +#define W1_THERM_DS18S20 0x10 +#define W1_THERM_DS1822 0x22 +#define W1_THERM_DS18B20 0x28 +#define W1_THERM_DS1825 0x3B +#define W1_THERM_DS28EA00 0x42 /* Allow the strong pullup to be disabled, but default to enabled. * If it was disabled a parasite powered device might not get the require diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 8172dee5e23c..95ea7e6b1d99 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -28,11 +28,11 @@ #include -#include "w1.h" -#include "w1_int.h" -#include "w1_family.h" +#include "w1_internal.h" #include "w1_netlink.h" +#define W1_FAMILY_DEFAULT 0 + static int w1_timeout = 10; module_param_named(timeout, w1_timeout, int, 0); MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches"); diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h deleted file mode 100644 index 758a7a6322e9..000000000000 --- a/drivers/w1/w1.h +++ /dev/null @@ -1,336 +0,0 @@ -/* - * Copyright (c) 2004 Evgeniy Polyakov - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#ifndef __W1_H -#define __W1_H - -/** - * struct w1_reg_num - broken out slave device id - * - * @family: identifies the type of device - * @id: along with family is the unique device id - * @crc: checksum of the other bytes - */ -struct w1_reg_num -{ -#if defined(__LITTLE_ENDIAN_BITFIELD) - __u64 family:8, - id:48, - crc:8; -#elif defined(__BIG_ENDIAN_BITFIELD) - __u64 crc:8, - id:48, - family:8; -#else -#error "Please fix " -#endif -}; - -#ifdef __KERNEL__ - -#include -#include -#include - -#include "w1_family.h" - -#define W1_MAXNAMELEN 32 - -#define W1_SEARCH 0xF0 -#define W1_ALARM_SEARCH 0xEC -#define W1_CONVERT_TEMP 0x44 -#define W1_SKIP_ROM 0xCC -#define W1_COPY_SCRATCHPAD 0x48 -#define W1_WRITE_SCRATCHPAD 0x4E -#define W1_READ_SCRATCHPAD 0xBE -#define W1_READ_ROM 0x33 -#define W1_READ_PSUPPLY 0xB4 -#define W1_MATCH_ROM 0x55 -#define W1_RESUME_CMD 0xA5 - -#define W1_SLAVE_ACTIVE 0 -#define W1_SLAVE_DETACH 1 - -/** - * struct w1_slave - holds a single slave device on the bus - * - * @owner: Points to the one wire "wire" kernel module. - * @name: Device id is ascii. - * @w1_slave_entry: data for the linked list - * @reg_num: the slave id in binary - * @refcnt: reference count, delete when 0 - * @flags: bit flags for W1_SLAVE_ACTIVE W1_SLAVE_DETACH - * @ttl: decrement per search this slave isn't found, deatch at 0 - * @master: bus which this slave is on - * @family: module for device family type - * @family_data: pointer for use by the family module - * @dev: kernel device identifier - * - */ -struct w1_slave -{ - struct module *owner; - unsigned char name[W1_MAXNAMELEN]; - struct list_head w1_slave_entry; - struct w1_reg_num reg_num; - atomic_t refcnt; - int ttl; - unsigned long flags; - - struct w1_master *master; - struct w1_family *family; - void *family_data; - struct device dev; -}; - -typedef void (*w1_slave_found_callback)(struct w1_master *, u64); - - -/** - * struct w1_bus_master - operations available on a bus master - * - * @data: the first parameter in all the functions below - * - * @read_bit: Sample the line level @return the level read (0 or 1) - * - * @write_bit: Sets the line level - * - * @touch_bit: the lowest-level function for devices that really support the - * 1-wire protocol. - * touch_bit(0) = write-0 cycle - * touch_bit(1) = write-1 / read cycle - * @return the bit read (0 or 1) - * - * @read_byte: Reads a bytes. Same as 8 touch_bit(1) calls. - * @return the byte read - * - * @write_byte: Writes a byte. Same as 8 touch_bit(x) calls. - * - * @read_block: Same as a series of read_byte() calls - * @return the number of bytes read - * - * @write_block: Same as a series of write_byte() calls - * - * @triplet: Combines two reads and a smart write for ROM searches - * @return bit0=Id bit1=comp_id bit2=dir_taken - * - * @reset_bus: long write-0 with a read for the presence pulse detection - * @return -1=Error, 0=Device present, 1=No device present - * - * @set_pullup: Put out a strong pull-up pulse of the specified duration. - * @return -1=Error, 0=completed - * - * @search: Really nice hardware can handles the different types of ROM search - * w1_master* is passed to the slave found callback. - * u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH - * - * Note: read_bit and write_bit are very low level functions and should only - * be used with hardware that doesn't really support 1-wire operations, - * like a parallel/serial port. - * Either define read_bit and write_bit OR define, at minimum, touch_bit and - * reset_bus. - * - */ -struct w1_bus_master -{ - void *data; - - u8 (*read_bit)(void *); - - void (*write_bit)(void *, u8); - - u8 (*touch_bit)(void *, u8); - - u8 (*read_byte)(void *); - - void (*write_byte)(void *, u8); - - u8 (*read_block)(void *, u8 *, int); - - void (*write_block)(void *, const u8 *, int); - - u8 (*triplet)(void *, u8); - - u8 (*reset_bus)(void *); - - u8 (*set_pullup)(void *, int); - - void (*search)(void *, struct w1_master *, - u8, w1_slave_found_callback); -}; - -/** - * enum w1_master_flags - bitfields used in w1_master.flags - * @W1_ABORT_SEARCH: abort searching early on shutdown - * @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached - */ -enum w1_master_flags { - W1_ABORT_SEARCH = 0, - W1_WARN_MAX_COUNT = 1, -}; - -/** - * struct w1_master - one per bus master - * @w1_master_entry: master linked list - * @owner: module owner - * @name: dynamically allocate bus name - * @list_mutex: protect slist and async_list - * @slist: linked list of slaves - * @async_list: linked list of netlink commands to execute - * @max_slave_count: maximum number of slaves to search for at a time - * @slave_count: current number of slaves known - * @attempts: number of searches ran - * @slave_ttl: number of searches before a slave is timed out - * @initialized: prevent init/removal race conditions - * @id: w1 bus number - * @search_count: number of automatic searches to run, -1 unlimited - * @search_id: allows continuing a search - * @refcnt: reference count - * @priv: private data storage - * @enable_pullup: allows a strong pullup - * @pullup_duration: time for the next strong pullup - * @flags: one of w1_master_flags - * @thread: thread for bus search and netlink commands - * @mutex: protect most of w1_master - * @bus_mutex: pretect concurrent bus access - * @driver: sysfs driver - * @dev: sysfs device - * @bus_master: io operations available - * @seq: sequence number used for netlink broadcasts - */ -struct w1_master -{ - struct list_head w1_master_entry; - struct module *owner; - unsigned char name[W1_MAXNAMELEN]; - /* list_mutex protects just slist and async_list so slaves can be - * searched for and async commands added while the master has - * w1_master.mutex locked and is operating on the bus. - * lock order w1_mlock, w1_master.mutex, w1_master.list_mutex - */ - struct mutex list_mutex; - struct list_head slist; - struct list_head async_list; - int max_slave_count, slave_count; - unsigned long attempts; - int slave_ttl; - int initialized; - u32 id; - int search_count; - /* id to start searching on, to continue a search or 0 to restart */ - u64 search_id; - - atomic_t refcnt; - - void *priv; - - /** 5V strong pullup enabled flag, 1 enabled, zero disabled. */ - int enable_pullup; - /** 5V strong pullup duration in milliseconds, zero disabled. */ - int pullup_duration; - - long flags; - - struct task_struct *thread; - struct mutex mutex; - struct mutex bus_mutex; - - struct device_driver *driver; - struct device dev; - - struct w1_bus_master *bus_master; - - u32 seq; -}; - -/** - * struct w1_async_cmd - execute callback from the w1_process kthread - * @async_entry: link entry - * @cb: callback function, must list_del and destroy this list before - * returning - * - * When inserted into the w1_master async_list, w1_process will execute - * the callback. Embed this into the structure with the command details. - */ -struct w1_async_cmd { - struct list_head async_entry; - void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd); -}; - -int w1_create_master_attributes(struct w1_master *); -void w1_destroy_master_attributes(struct w1_master *master); -void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb); -void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb); -/* call w1_unref_slave to release the reference counts w1_search_slave added */ -struct w1_slave *w1_search_slave(struct w1_reg_num *id); -/* decrements the reference on sl->master and sl, and cleans up if zero - * returns the reference count after it has been decremented */ -int w1_unref_slave(struct w1_slave *sl); -void w1_slave_found(struct w1_master *dev, u64 rn); -void w1_search_process_cb(struct w1_master *dev, u8 search_type, - w1_slave_found_callback cb); -struct w1_slave *w1_slave_search_device(struct w1_master *dev, - struct w1_reg_num *rn); -struct w1_master *w1_search_master_id(u32 id); - -/* Disconnect and reconnect devices in the given family. Used for finding - * unclaimed devices after a family has been registered or releasing devices - * after a family has been unregistered. Set attach to 1 when a new family - * has just been registered, to 0 when it has been unregistered. - */ -void w1_reconnect_slaves(struct w1_family *f, int attach); -int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); -/* 0 success, otherwise EBUSY */ -int w1_slave_detach(struct w1_slave *sl); - -u8 w1_triplet(struct w1_master *dev, int bdir); -void w1_write_8(struct w1_master *, u8); -u8 w1_read_8(struct w1_master *); -int w1_reset_bus(struct w1_master *); -u8 w1_calc_crc8(u8 *, int); -void w1_write_block(struct w1_master *, const u8 *, int); -void w1_touch_block(struct w1_master *, u8 *, int); -u8 w1_read_block(struct w1_master *, u8 *, int); -int w1_reset_select_slave(struct w1_slave *sl); -int w1_reset_resume_command(struct w1_master *); -void w1_next_pullup(struct w1_master *, int); - -static inline struct w1_slave* dev_to_w1_slave(struct device *dev) -{ - return container_of(dev, struct w1_slave, dev); -} - -static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj) -{ - return dev_to_w1_slave(container_of(kobj, struct device, kobj)); -} - -static inline struct w1_master* dev_to_w1_master(struct device *dev) -{ - return container_of(dev, struct w1_master, dev); -} - -extern struct device_driver w1_master_driver; -extern struct device w1_master_device; -extern int w1_max_slave_count; -extern int w1_max_slave_ttl; -extern struct list_head w1_masters; -extern struct mutex w1_mlock; - -extern int w1_process_callbacks(struct w1_master *dev); -extern int w1_process(void *); - -#endif /* __KERNEL__ */ - -#endif /* __W1_H */ diff --git a/drivers/w1/w1_family.c b/drivers/w1/w1_family.c index 9759cdaf22f4..f14ab0b340b5 100644 --- a/drivers/w1/w1_family.c +++ b/drivers/w1/w1_family.c @@ -18,8 +18,7 @@ #include #include -#include "w1_family.h" -#include "w1.h" +#include "w1_internal.h" DEFINE_SPINLOCK(w1_flock); static LIST_HEAD(w1_families); diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h deleted file mode 100644 index 869a3ff87d29..000000000000 --- a/drivers/w1/w1_family.h +++ /dev/null @@ -1,98 +0,0 @@ -/* - * Copyright (c) 2004 Evgeniy Polyakov - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#ifndef __W1_FAMILY_H -#define __W1_FAMILY_H - -#include -#include -#include - -#define W1_FAMILY_DEFAULT 0 -#define W1_FAMILY_BQ27000 0x01 -#define W1_FAMILY_SMEM_01 0x01 -#define W1_FAMILY_SMEM_81 0x81 -#define W1_FAMILY_DS2405 0x05 -#define W1_THERM_DS18S20 0x10 -#define W1_FAMILY_DS28E04 0x1C -#define W1_COUNTER_DS2423 0x1D -#define W1_THERM_DS1822 0x22 -#define W1_EEPROM_DS2433 0x23 -#define W1_FAMILY_DS2438 0x26 -#define W1_THERM_DS18B20 0x28 -#define W1_FAMILY_DS2408 0x29 -#define W1_EEPROM_DS2431 0x2D -#define W1_FAMILY_DS2760 0x30 -#define W1_FAMILY_DS2780 0x32 -#define W1_FAMILY_DS2413 0x3A -#define W1_FAMILY_DS2406 0x12 -#define W1_THERM_DS1825 0x3B -#define W1_FAMILY_DS2781 0x3D -#define W1_THERM_DS28EA00 0x42 - -#define MAXNAMELEN 32 - -struct w1_slave; - -/** - * struct w1_family_ops - operations for a family type - * @add_slave: add_slave - * @remove_slave: remove_slave - * @groups: sysfs group - */ -struct w1_family_ops -{ - int (* add_slave)(struct w1_slave *); - void (* remove_slave)(struct w1_slave *); - const struct attribute_group **groups; -}; - -/** - * struct w1_family - reference counted family structure. - * @family_entry: family linked list - * @fid: 8 bit family identifier - * @fops: operations for this family - * @refcnt: reference counter - */ -struct w1_family -{ - struct list_head family_entry; - u8 fid; - - struct w1_family_ops *fops; - - atomic_t refcnt; -}; - -extern spinlock_t w1_flock; - -void w1_family_put(struct w1_family *); -void __w1_family_get(struct w1_family *); -struct w1_family * w1_family_registered(u8); -void w1_unregister_family(struct w1_family *); -int w1_register_family(struct w1_family *); - -/** - * module_w1_driver() - Helper macro for registering a 1-Wire families - * @__w1_family: w1_family struct - * - * Helper macro for 1-Wire families which do not do anything special in module - * init/exit. This eliminates a lot of boilerplate. Each module may only - * use this macro once, and calling it replaces module_init() and module_exit() - */ -#define module_w1_family(__w1_family) \ - module_driver(__w1_family, w1_register_family, \ - w1_unregister_family) - -#endif /* __W1_FAMILY_H */ diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 4439d10709bb..1c776178f598 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -21,9 +21,8 @@ #include #include -#include "w1.h" +#include "w1_internal.h" #include "w1_netlink.h" -#include "w1_int.h" static int w1_search_count = -1; /* Default is continual scan */ module_param_named(search_count, w1_search_count, int, 0); diff --git a/drivers/w1/w1_int.h b/drivers/w1/w1_int.h deleted file mode 100644 index 371989159216..000000000000 --- a/drivers/w1/w1_int.h +++ /dev/null @@ -1,27 +0,0 @@ -/* - * Copyright (c) 2004 Evgeniy Polyakov - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#ifndef __W1_INT_H -#define __W1_INT_H - -#include -#include - -#include "w1.h" - -int w1_add_master_device(struct w1_bus_master *); -void w1_remove_master_device(struct w1_bus_master *); -void __w1_remove_master_device(struct w1_master *); - -#endif /* __W1_INT_H */ diff --git a/drivers/w1/w1_internal.h b/drivers/w1/w1_internal.h new file mode 100644 index 000000000000..1623e2fdccc7 --- /dev/null +++ b/drivers/w1/w1_internal.h @@ -0,0 +1,87 @@ +/* + * Copyright (c) 2004 Evgeniy Polyakov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __W1_H +#define __W1_H + +#include + +#include +#include + +#define W1_SLAVE_ACTIVE 0 +#define W1_SLAVE_DETACH 1 + +/** + * struct w1_async_cmd - execute callback from the w1_process kthread + * @async_entry: link entry + * @cb: callback function, must list_del and destroy this list before + * returning + * + * When inserted into the w1_master async_list, w1_process will execute + * the callback. Embed this into the structure with the command details. + */ +struct w1_async_cmd { + struct list_head async_entry; + void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd); +}; + +int w1_create_master_attributes(struct w1_master *master); +void w1_destroy_master_attributes(struct w1_master *master); +void w1_search(struct w1_master *dev, u8 search_type, + w1_slave_found_callback cb); +void w1_search_devices(struct w1_master *dev, u8 search_type, + w1_slave_found_callback cb); +/* call w1_unref_slave to release the reference counts w1_search_slave added */ +struct w1_slave *w1_search_slave(struct w1_reg_num *id); +/* + * decrements the reference on sl->master and sl, and cleans up if zero + * returns the reference count after it has been decremented + */ +int w1_unref_slave(struct w1_slave *sl); +void w1_slave_found(struct w1_master *dev, u64 rn); +void w1_search_process_cb(struct w1_master *dev, u8 search_type, + w1_slave_found_callback cb); +struct w1_slave *w1_slave_search_device(struct w1_master *dev, + struct w1_reg_num *rn); +struct w1_master *w1_search_master_id(u32 id); + +/* Disconnect and reconnect devices in the given family. Used for finding + * unclaimed devices after a family has been registered or releasing devices + * after a family has been unregistered. Set attach to 1 when a new family + * has just been registered, to 0 when it has been unregistered. + */ +void w1_reconnect_slaves(struct w1_family *f, int attach); +int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn); +/* 0 success, otherwise EBUSY */ +int w1_slave_detach(struct w1_slave *sl); + +void __w1_remove_master_device(struct w1_master *dev); + +void w1_family_put(struct w1_family *f); +void __w1_family_get(struct w1_family *f); +struct w1_family *w1_family_registered(u8 fid); + +extern struct device_driver w1_master_driver; +extern struct device w1_master_device; +extern int w1_max_slave_count; +extern int w1_max_slave_ttl; +extern struct list_head w1_masters; +extern struct mutex w1_mlock; +extern spinlock_t w1_flock; + +int w1_process_callbacks(struct w1_master *dev); +int w1_process(void *data); + +#endif /* __W1_H */ diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c index 1134e6b1eb02..d191e1f80579 100644 --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -18,7 +18,7 @@ #include #include -#include "w1.h" +#include "w1_internal.h" static int w1_delay_parm = 1; module_param_named(delay_coef, w1_delay_parm, int, 0); diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c index 027950f997d1..f2f099caeb77 100644 --- a/drivers/w1/w1_netlink.c +++ b/drivers/w1/w1_netlink.c @@ -17,7 +17,7 @@ #include #include -#include "w1.h" +#include "w1_internal.h" #include "w1_netlink.h" #if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE))) diff --git a/drivers/w1/w1_netlink.h b/drivers/w1/w1_netlink.h index b389e5ff5fa5..a36661cd1f05 100644 --- a/drivers/w1/w1_netlink.h +++ b/drivers/w1/w1_netlink.h @@ -18,7 +18,7 @@ #include #include -#include "w1.h" +#include "w1_internal.h" /** * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags diff --git a/include/linux/w1.h b/include/linux/w1.h new file mode 100644 index 000000000000..90cbe7e65059 --- /dev/null +++ b/include/linux/w1.h @@ -0,0 +1,320 @@ +/* + * Copyright (c) 2004 Evgeniy Polyakov + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __LINUX_W1_H +#define __LINUX_W1_H + +#include + +/** + * struct w1_reg_num - broken out slave device id + * + * @family: identifies the type of device + * @id: along with family is the unique device id + * @crc: checksum of the other bytes + */ +struct w1_reg_num { +#if defined(__LITTLE_ENDIAN_BITFIELD) + __u64 family:8, + id:48, + crc:8; +#elif defined(__BIG_ENDIAN_BITFIELD) + __u64 crc:8, + id:48, + family:8; +#else +#error "Please fix " +#endif +}; + +#ifdef __KERNEL__ + +#define W1_MAXNAMELEN 32 + +#define W1_SEARCH 0xF0 +#define W1_ALARM_SEARCH 0xEC +#define W1_CONVERT_TEMP 0x44 +#define W1_SKIP_ROM 0xCC +#define W1_COPY_SCRATCHPAD 0x48 +#define W1_WRITE_SCRATCHPAD 0x4E +#define W1_READ_SCRATCHPAD 0xBE +#define W1_READ_ROM 0x33 +#define W1_READ_PSUPPLY 0xB4 +#define W1_MATCH_ROM 0x55 +#define W1_RESUME_CMD 0xA5 + +/** + * struct w1_slave - holds a single slave device on the bus + * + * @owner: Points to the one wire "wire" kernel module. + * @name: Device id is ascii. + * @w1_slave_entry: data for the linked list + * @reg_num: the slave id in binary + * @refcnt: reference count, delete when 0 + * @flags: bit flags for W1_SLAVE_ACTIVE W1_SLAVE_DETACH + * @ttl: decrement per search this slave isn't found, deatch at 0 + * @master: bus which this slave is on + * @family: module for device family type + * @family_data: pointer for use by the family module + * @dev: kernel device identifier + * + */ +struct w1_slave { + struct module *owner; + unsigned char name[W1_MAXNAMELEN]; + struct list_head w1_slave_entry; + struct w1_reg_num reg_num; + atomic_t refcnt; + int ttl; + unsigned long flags; + + struct w1_master *master; + struct w1_family *family; + void *family_data; + struct device dev; +}; + +typedef void (*w1_slave_found_callback)(struct w1_master *, u64); + +/** + * struct w1_bus_master - operations available on a bus master + * + * @data: the first parameter in all the functions below + * + * @read_bit: Sample the line level @return the level read (0 or 1) + * + * @write_bit: Sets the line level + * + * @touch_bit: the lowest-level function for devices that really support the + * 1-wire protocol. + * touch_bit(0) = write-0 cycle + * touch_bit(1) = write-1 / read cycle + * @return the bit read (0 or 1) + * + * @read_byte: Reads a bytes. Same as 8 touch_bit(1) calls. + * @return the byte read + * + * @write_byte: Writes a byte. Same as 8 touch_bit(x) calls. + * + * @read_block: Same as a series of read_byte() calls + * @return the number of bytes read + * + * @write_block: Same as a series of write_byte() calls + * + * @triplet: Combines two reads and a smart write for ROM searches + * @return bit0=Id bit1=comp_id bit2=dir_taken + * + * @reset_bus: long write-0 with a read for the presence pulse detection + * @return -1=Error, 0=Device present, 1=No device present + * + * @set_pullup: Put out a strong pull-up pulse of the specified duration. + * @return -1=Error, 0=completed + * + * @search: Really nice hardware can handles the different types of ROM search + * w1_master* is passed to the slave found callback. + * u8 is search_type, W1_SEARCH or W1_ALARM_SEARCH + * + * Note: read_bit and write_bit are very low level functions and should only + * be used with hardware that doesn't really support 1-wire operations, + * like a parallel/serial port. + * Either define read_bit and write_bit OR define, at minimum, touch_bit and + * reset_bus. + * + */ +struct w1_bus_master { + void *data; + + u8 (*read_bit)(void *); + + void (*write_bit)(void *, u8); + + u8 (*touch_bit)(void *, u8); + + u8 (*read_byte)(void *); + + void (*write_byte)(void *, u8); + + u8 (*read_block)(void *, u8 *, int); + + void (*write_block)(void *, const u8 *, int); + + u8 (*triplet)(void *, u8); + + u8 (*reset_bus)(void *); + + u8 (*set_pullup)(void *, int); + + void (*search)(void *, struct w1_master *, + u8, w1_slave_found_callback); +}; + +/** + * enum w1_master_flags - bitfields used in w1_master.flags + * @W1_ABORT_SEARCH: abort searching early on shutdown + * @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached + */ +enum w1_master_flags { + W1_ABORT_SEARCH = 0, + W1_WARN_MAX_COUNT = 1, +}; + +/** + * struct w1_master - one per bus master + * @w1_master_entry: master linked list + * @owner: module owner + * @name: dynamically allocate bus name + * @list_mutex: protect slist and async_list + * @slist: linked list of slaves + * @async_list: linked list of netlink commands to execute + * @max_slave_count: maximum number of slaves to search for at a time + * @slave_count: current number of slaves known + * @attempts: number of searches ran + * @slave_ttl: number of searches before a slave is timed out + * @initialized: prevent init/removal race conditions + * @id: w1 bus number + * @search_count: number of automatic searches to run, -1 unlimited + * @search_id: allows continuing a search + * @refcnt: reference count + * @priv: private data storage + * @enable_pullup: allows a strong pullup + * @pullup_duration: time for the next strong pullup + * @flags: one of w1_master_flags + * @thread: thread for bus search and netlink commands + * @mutex: protect most of w1_master + * @bus_mutex: pretect concurrent bus access + * @driver: sysfs driver + * @dev: sysfs device + * @bus_master: io operations available + * @seq: sequence number used for netlink broadcasts + */ +struct w1_master { + struct list_head w1_master_entry; + struct module *owner; + unsigned char name[W1_MAXNAMELEN]; + /* list_mutex protects just slist and async_list so slaves can be + * searched for and async commands added while the master has + * w1_master.mutex locked and is operating on the bus. + * lock order w1_mlock, w1_master.mutex, w1_master.list_mutex + */ + struct mutex list_mutex; + struct list_head slist; + struct list_head async_list; + int max_slave_count, slave_count; + unsigned long attempts; + int slave_ttl; + int initialized; + u32 id; + int search_count; + /* id to start searching on, to continue a search or 0 to restart */ + u64 search_id; + + atomic_t refcnt; + + void *priv; + + /** 5V strong pullup enabled flag, 1 enabled, zero disabled. */ + int enable_pullup; + /** 5V strong pullup duration in milliseconds, zero disabled. */ + int pullup_duration; + + long flags; + + struct task_struct *thread; + struct mutex mutex; + struct mutex bus_mutex; + + struct device_driver *driver; + struct device dev; + + struct w1_bus_master *bus_master; + + u32 seq; +}; + +int w1_add_master_device(struct w1_bus_master *master); +void w1_remove_master_device(struct w1_bus_master *master); + +/** + * struct w1_family_ops - operations for a family type + * @add_slave: add_slave + * @remove_slave: remove_slave + * @groups: sysfs group + */ +struct w1_family_ops { + int (*add_slave)(struct w1_slave *sl); + void (*remove_slave)(struct w1_slave *sl); + const struct attribute_group **groups; +}; + +/** + * struct w1_family - reference counted family structure. + * @family_entry: family linked list + * @fid: 8 bit family identifier + * @fops: operations for this family + * @refcnt: reference counter + */ +struct w1_family { + struct list_head family_entry; + u8 fid; + + struct w1_family_ops *fops; + + atomic_t refcnt; +}; + +int w1_register_family(struct w1_family *family); +void w1_unregister_family(struct w1_family *family); + +/** + * module_w1_driver() - Helper macro for registering a 1-Wire families + * @__w1_family: w1_family struct + * + * Helper macro for 1-Wire families which do not do anything special in module + * init/exit. This eliminates a lot of boilerplate. Each module may only + * use this macro once, and calling it replaces module_init() and module_exit() + */ +#define module_w1_family(__w1_family) \ + module_driver(__w1_family, w1_register_family, \ + w1_unregister_family) + +u8 w1_triplet(struct w1_master *dev, int bdir); +void w1_write_8(struct w1_master *, u8); +u8 w1_read_8(struct w1_master *); +int w1_reset_bus(struct w1_master *); +u8 w1_calc_crc8(u8 *, int); +void w1_write_block(struct w1_master *, const u8 *, int); +void w1_touch_block(struct w1_master *, u8 *, int); +u8 w1_read_block(struct w1_master *, u8 *, int); +int w1_reset_select_slave(struct w1_slave *sl); +int w1_reset_resume_command(struct w1_master *); +void w1_next_pullup(struct w1_master *, int); + +static inline struct w1_slave* dev_to_w1_slave(struct device *dev) +{ + return container_of(dev, struct w1_slave, dev); +} + +static inline struct w1_slave* kobj_to_w1_slave(struct kobject *kobj) +{ + return dev_to_w1_slave(container_of(kobj, struct device, kobj)); +} + +static inline struct w1_master* dev_to_w1_master(struct device *dev) +{ + return container_of(dev, struct w1_master, dev); +} + +#endif /* __KERNEL__ */ + +#endif /* __LINUX_W1_H */ -- cgit v1.2.3 From e827756d64773515fa7de5e7e942a6d1494bf64e Mon Sep 17 00:00:00 2001 From: Oza Pawandeep Date: Fri, 9 Jun 2017 10:59:06 +0100 Subject: nvmem: correct Broadcom OTP controller driver writes - use data write offset to write otp data instead of read offset - use OTP program command 0x8 to write otp with ECC rather than just command 0xA without ECC Fixes: 9d59c6e8ae27 ("nvmem: Add the Broadcom OTP controller driver") Signed-off-by: Oza Pawandeep Signed-off-by: Scott Branden Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/bcm-ocotp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/nvmem/bcm-ocotp.c b/drivers/nvmem/bcm-ocotp.c index 646cadbf1f93..3c56e3b2bd65 100644 --- a/drivers/nvmem/bcm-ocotp.c +++ b/drivers/nvmem/bcm-ocotp.c @@ -34,7 +34,7 @@ #define OTPC_CMD_READ 0x0 #define OTPC_CMD_OTP_PROG_ENABLE 0x2 #define OTPC_CMD_OTP_PROG_DISABLE 0x3 -#define OTPC_CMD_PROGRAM 0xA +#define OTPC_CMD_PROGRAM 0x8 /* OTPC Status Bits */ #define OTPC_STAT_CMD_DONE BIT(1) @@ -209,7 +209,7 @@ static int bcm_otpc_write(void *context, unsigned int offset, void *val, set_command(priv->base, OTPC_CMD_PROGRAM); set_cpu_address(priv->base, address++); for (i = 0; i < priv->map->otpc_row_size; i++) { - writel(*buf, priv->base + priv->map->data_r_offset[i]); + writel(*buf, priv->base + priv->map->data_w_offset[i]); buf++; bytes_written += sizeof(*buf); } -- cgit v1.2.3 From 3360acdf839170b612f5b212539694c20e3f16d0 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Fri, 9 Jun 2017 10:59:07 +0100 Subject: nvmem: core: fix leaks on registration errors Make sure to deregister and release the nvmem device and underlying memory on registration errors. Note that the private data must be freed using put_device() once the struct device has been initialised. Also note that there's a related reference leak in the deregistration function as reported by Mika Westerberg which is being fixed separately. Fixes: b6c217ab9be6 ("nvmem: Add backwards compatibility support for older EEPROM drivers.") Fixes: eace75cfdcf7 ("nvmem: Add a simple NVMEM framework for nvmem providers") Cc: stable # 4.3 Cc: Andrew Lunn Cc: Srinivas Kandagatla Cc: Mika Westerberg Signed-off-by: Johan Hovold Acked-by: Andrey Smirnov Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/core.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 8c830a80a648..6cf916d9db6d 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -489,21 +489,24 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) rval = device_add(&nvmem->dev); if (rval) - goto out; + goto err_put_device; if (config->compat) { rval = nvmem_setup_compat(nvmem, config); if (rval) - goto out; + goto err_device_del; } if (config->cells) nvmem_add_cells(nvmem, config); return nvmem; -out: - ida_simple_remove(&nvmem_ida, nvmem->id); - kfree(nvmem); + +err_device_del: + device_del(&nvmem->dev); +err_put_device: + put_device(&nvmem->dev); + return ERR_PTR(rval); } EXPORT_SYMBOL_GPL(nvmem_register); -- cgit v1.2.3 From 79fbf0468b2a05a743d31794423925d229c0e9c2 Mon Sep 17 00:00:00 2001 From: Andrey Smirnov Date: Fri, 9 Jun 2017 10:59:08 +0100 Subject: nvmem: core: Call put_device() in nvmem_unregister() Call put_device() in nvmem_unregister() to make sure nvmem_release gets called freeing up allocated resources. Cc: cphealy@gmail.com Cc: Srinivas Kandagatla Cc: Maxime Ripard Signed-off-by: Andrey Smirnov Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 6cf916d9db6d..0cbac71195b5 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -532,6 +532,7 @@ int nvmem_unregister(struct nvmem_device *nvmem) nvmem_device_remove_all_cells(nvmem); device_del(&nvmem->dev); + put_device(&nvmem->dev); return 0; } -- cgit v1.2.3 From 666d6a36234f3123e909165ac32ea692213f0155 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Fri, 9 Jun 2017 10:59:09 +0100 Subject: nvmem: core: add locking to nvmem_find_cell Adding entries to nvmem_cells and deleting entries from it is protected by nvmem_cells_mutex. Therefore this mutex should also protect iterating over the list. Signed-off-by: Heiner Kallweit Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 0cbac71195b5..4c49285168fb 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -287,9 +287,15 @@ static struct nvmem_cell *nvmem_find_cell(const char *cell_id) { struct nvmem_cell *p; + mutex_lock(&nvmem_cells_mutex); + list_for_each_entry(p, &nvmem_cells, node) - if (p && !strcmp(p->name, cell_id)) + if (p && !strcmp(p->name, cell_id)) { + mutex_unlock(&nvmem_cells_mutex); return p; + } + + mutex_unlock(&nvmem_cells_mutex); return NULL; } -- cgit v1.2.3 From 820de1fb69f16a4307e4b5d4adf6e9246a680655 Mon Sep 17 00:00:00 2001 From: Finley Xiao Date: Fri, 9 Jun 2017 10:59:10 +0100 Subject: nvmem: rockchip-efuse: add support for rk322x-efuse This adds the necessary data for handling eFuse on the rk322x. Signed-off-by: Finley Xiao Acked-by: Rob Herring Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt | 1 + drivers/nvmem/rockchip-efuse.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt index 94aeeeabadd5..194926f77194 100644 --- a/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt +++ b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt @@ -4,6 +4,7 @@ Required properties: - compatible: Should be one of the following. - "rockchip,rk3066a-efuse" - for RK3066a SoCs. - "rockchip,rk3188-efuse" - for RK3188 SoCs. + - "rockchip,rk322x-efuse" - for RK322x SoCs. - "rockchip,rk3288-efuse" - for RK3288 SoCs. - "rockchip,rk3399-efuse" - for RK3399 SoCs. - reg: Should contain the registers location and exact eFuse size diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c index 423907bdd259..a0d4ede9b8fc 100644 --- a/drivers/nvmem/rockchip-efuse.c +++ b/drivers/nvmem/rockchip-efuse.c @@ -169,6 +169,10 @@ static const struct of_device_id rockchip_efuse_match[] = { .compatible = "rockchip,rk3188-efuse", .data = (void *)&rockchip_rk3288_efuse_read, }, + { + .compatible = "rockchip,rk322x-efuse", + .data = (void *)&rockchip_rk3288_efuse_read, + }, { .compatible = "rockchip,rk3288-efuse", .data = (void *)&rockchip_rk3288_efuse_read, -- cgit v1.2.3 From aca4e68acf3a08561f2a413322cbb232edad8764 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 9 Jun 2017 12:22:51 +0200 Subject: mux: adg792a: always require I2C support COMPILE_TEST makes no sense when I2C is disabled, as the driver cannot compile in that configuration: drivers/mux/mux-adg792a.c: In function 'adg792a_write_cmd': drivers/mux/mux-adg792a.c:34:9: error: implicit declaration of function 'i2c_smbus_write_byte_data'; did you mean 'i2c_set_clientdata'? [-Werror=implicit-function-declaration] drivers/mux/mux-adg792a.o: In function `adg792a_driver_init': mux-adg792a.c:(.init.text+0x14): undefined reference to `i2c_register_driver' drivers/mux/mux-adg792a.o: In function `adg792a_probe': mux-adg792a.c:(.text.adg792a_probe+0x94): undefined reference to `i2c_smbus_write_byte_data' drivers/mux/mux-adg792a.o: In function `adg792a_set': mux-adg792a.c:(.text.adg792a_set+0x80): undefined reference to `i2c_smbus_write_byte_data' Fixes: afda08c4caa9 ("mux: adg792a: add mux controller driver for ADG792A/G") Signed-off-by: Arnd Bergmann Reviewed-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- drivers/mux/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig index e8f1df74644c..7c754a0f14bb 100644 --- a/drivers/mux/Kconfig +++ b/drivers/mux/Kconfig @@ -19,7 +19,7 @@ if MULTIPLEXER config MUX_ADG792A tristate "Analog Devices ADG792A/ADG792G Multiplexers" - depends on I2C || COMPILE_TEST + depends on I2C help ADG792A and ADG792G Wide Bandwidth Triple 4:1 Multiplexers -- cgit v1.2.3 From f85e8813b2c9346821e704c175d8933d25410331 Mon Sep 17 00:00:00 2001 From: "Andrew F. Davis" Date: Mon, 12 Jun 2017 09:42:46 -0500 Subject: DocBook: w1: Update W1 file locations and names in DocBook Some of the files in the W1 subsystem have been moved or renamed, update the documentation for the same. Signed-off-by: Andrew F. Davis Signed-off-by: Greg Kroah-Hartman --- Documentation/DocBook/w1.tmpl | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/Documentation/DocBook/w1.tmpl b/Documentation/DocBook/w1.tmpl index b0228d4c81bb..c65cb27abef9 100644 --- a/Documentation/DocBook/w1.tmpl +++ b/Documentation/DocBook/w1.tmpl @@ -51,9 +51,9 @@ W1 API internal to the kernel - drivers/w1/w1.h - W1 core functions. -!Idrivers/w1/w1.h + include/linux/w1.h + W1 kernel API functions. +!Iinclude/linux/w1.h @@ -62,18 +62,18 @@ !Idrivers/w1/w1.c - - drivers/w1/w1_family.h - Allows registering device family operations. -!Idrivers/w1/w1_family.h - - drivers/w1/w1_family.c Allows registering device family operations. !Edrivers/w1/w1_family.c + + drivers/w1/w1_internal.h + W1 internal initialization for master devices. +!Idrivers/w1/w1_internal.h + + drivers/w1/w1_int.c W1 internal initialization for master devices. -- cgit v1.2.3 From 99c06866bc64a79ec5cf9b9e73fb7c1ba4b3551a Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Mon, 12 Jun 2017 12:15:55 +0300 Subject: mei: validate the message header only in first fragment. RX message header is received in the first fragment of the message and saved side and it is not modified after that, we don't need to validate it upon each fragment. Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/interrupt.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c index c14e35201721..b0b8f18a85e3 100644 --- a/drivers/misc/mei/interrupt.c +++ b/drivers/misc/mei/interrupt.c @@ -235,6 +235,17 @@ static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr) return mei_hdr->host_addr == 0 && mei_hdr->me_addr != 0; } +static inline int hdr_is_valid(u32 msg_hdr) +{ + struct mei_msg_hdr *mei_hdr; + + mei_hdr = (struct mei_msg_hdr *)&msg_hdr; + if (!msg_hdr || mei_hdr->reserved) + return -EBADMSG; + + return 0; +} + /** * mei_irq_read_handler - bottom half read routine after ISR to * handle the read processing. @@ -256,17 +267,18 @@ int mei_irq_read_handler(struct mei_device *dev, dev->rd_msg_hdr = mei_read_hdr(dev); (*slots)--; dev_dbg(dev->dev, "slots =%08x.\n", *slots); - } - mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr; - dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr)); - if (mei_hdr->reserved || !dev->rd_msg_hdr) { - dev_err(dev->dev, "corrupted message header 0x%08X\n", + ret = hdr_is_valid(dev->rd_msg_hdr); + if (ret) { + dev_err(dev->dev, "corrupted message header 0x%08X\n", dev->rd_msg_hdr); - ret = -EBADMSG; - goto end; + goto end; + } } + mei_hdr = (struct mei_msg_hdr *)&dev->rd_msg_hdr; + dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr)); + if (mei_slots2data(*slots) < mei_hdr->length) { dev_err(dev->dev, "less data available than length=%08x.\n", *slots); -- cgit v1.2.3 From c845736dbcd26619acc136b588bcd2f48b1fda45 Mon Sep 17 00:00:00 2001 From: Alexander Usyskin Date: Mon, 12 Jun 2017 12:15:56 +0300 Subject: mei: drop unreachable code in mei_start Device disabled state is caught inside the retry loop, so there is no need to check it once again afterwards. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/init.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c index c8ad9ee7cb80..d2f691424dd1 100644 --- a/drivers/misc/mei/init.c +++ b/drivers/misc/mei/init.c @@ -215,12 +215,6 @@ int mei_start(struct mei_device *dev) } } while (ret); - /* we cannot start the device w/o hbm start message completed */ - if (dev->dev_state == MEI_DEV_DISABLED) { - dev_err(dev->dev, "reset failed"); - goto err; - } - if (mei_hbm_start_wait(dev)) { dev_err(dev->dev, "HBM haven't started"); goto err; -- cgit v1.2.3 From cbbdc6082917a92da0fc07cee255111de16ed64a Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Sun, 11 Jun 2017 17:52:20 +0300 Subject: misc: apds990x: Use sysfs_match_string() helper Use sysfs_match_string() helper instead of open coded variant. Cc: Arnd Bergmann Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/misc/apds990x.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/misc/apds990x.c b/drivers/misc/apds990x.c index c341164edaad..84e5b949399e 100644 --- a/drivers/misc/apds990x.c +++ b/drivers/misc/apds990x.c @@ -841,7 +841,7 @@ static ssize_t apds990x_prox_enable_store(struct device *dev, static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, apds990x_prox_enable_show, apds990x_prox_enable_store); -static const char reporting_modes[][9] = {"trigger", "periodic"}; +static const char *reporting_modes[] = {"trigger", "periodic"}; static ssize_t apds990x_prox_reporting_mode_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -856,13 +856,13 @@ static ssize_t apds990x_prox_reporting_mode_store(struct device *dev, const char *buf, size_t len) { struct apds990x_chip *chip = dev_get_drvdata(dev); + int ret; - if (sysfs_streq(buf, reporting_modes[0])) - chip->prox_continuous_mode = 0; - else if (sysfs_streq(buf, reporting_modes[1])) - chip->prox_continuous_mode = 1; - else - return -EINVAL; + ret = sysfs_match_string(reporting_modes, buf); + if (ret < 0) + return ret; + + chip->prox_continuous_mode = ret; return len; } -- cgit v1.2.3