diff options
Diffstat (limited to 'drivers/rpmsg/virtio_rpmsg_bus.c')
-rw-r--r-- | drivers/rpmsg/virtio_rpmsg_bus.c | 186 |
1 files changed, 67 insertions, 119 deletions
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c index 7d7ed4e5cce7..e87d4cf926eb 100644 --- a/drivers/rpmsg/virtio_rpmsg_bus.c +++ b/drivers/rpmsg/virtio_rpmsg_bus.c @@ -19,11 +19,12 @@ #include <linux/mutex.h> #include <linux/of_device.h> #include <linux/rpmsg.h> +#include <linux/rpmsg/byteorder.h> +#include <linux/rpmsg/ns.h> #include <linux/scatterlist.h> #include <linux/slab.h> #include <linux/sched.h> #include <linux/virtio.h> -#include <linux/virtio_byteorder.h> #include <linux/virtio_ids.h> #include <linux/virtio_config.h> #include <linux/wait.h> @@ -48,7 +49,6 @@ * @endpoints_lock: lock of the endpoints set * @sendq: wait queue of sending contexts waiting for a tx buffers * @sleepers: number of senders that are waiting for a tx buffer - * @ns_ept: the bus's name service endpoint * * This structure stores the rpmsg state of a given virtio remote processor * device (there might be several virtio proc devices for each physical @@ -67,7 +67,6 @@ struct virtproc_info { struct mutex endpoints_lock; wait_queue_head_t sendq; atomic_t sleepers; - struct rpmsg_endpoint *ns_ept; }; /* The feature bitmap for virtio rpmsg */ @@ -85,42 +84,14 @@ struct virtproc_info { * Every message sent(/received) on the rpmsg bus begins with this header. */ struct rpmsg_hdr { - __virtio32 src; - __virtio32 dst; - __virtio32 reserved; - __virtio16 len; - __virtio16 flags; + __rpmsg32 src; + __rpmsg32 dst; + __rpmsg32 reserved; + __rpmsg16 len; + __rpmsg16 flags; u8 data[]; } __packed; -/** - * struct rpmsg_ns_msg - dynamic name service announcement message - * @name: name of remote service that is published - * @addr: address of remote service that is published - * @flags: indicates whether service is created or destroyed - * - * This message is sent across to publish a new service, or announce - * about its removal. When we receive these messages, an appropriate - * rpmsg channel (i.e device) is created/destroyed. In turn, the ->probe() - * or ->remove() handler of the appropriate rpmsg driver will be invoked - * (if/as-soon-as one is registered). - */ -struct rpmsg_ns_msg { - char name[RPMSG_NAME_SIZE]; - __virtio32 addr; - __virtio32 flags; -} __packed; - -/** - * enum rpmsg_ns_flags - dynamic name service announcement flags - * - * @RPMSG_NS_CREATE: a new remote service was just created - * @RPMSG_NS_DESTROY: a known remote service was just destroyed - */ -enum rpmsg_ns_flags { - RPMSG_NS_CREATE = 0, - RPMSG_NS_DESTROY = 1, -}; /** * struct virtio_rpmsg_channel - rpmsg channel descriptor @@ -167,9 +138,6 @@ struct virtio_rpmsg_channel { */ #define RPMSG_RESERVED_ADDRESSES (1024) -/* Address 53 is reserved for advertising remote services */ -#define RPMSG_NS_ADDR (53) - static void virtio_rpmsg_destroy_ept(struct rpmsg_endpoint *ept); static int virtio_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len); static int virtio_rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, @@ -181,6 +149,8 @@ static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst); static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, void *data, int len); +static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp, + struct rpmsg_channel_info *chinfo); static const struct rpmsg_endpoint_ops virtio_endpoint_ops = { .destroy_ept = virtio_rpmsg_destroy_ept, @@ -285,6 +255,24 @@ free_ept: return NULL; } +static struct rpmsg_device *virtio_rpmsg_create_channel(struct rpmsg_device *rpdev, + struct rpmsg_channel_info *chinfo) +{ + struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev); + struct virtproc_info *vrp = vch->vrp; + + return __rpmsg_create_channel(vrp, chinfo); +} + +static int virtio_rpmsg_release_channel(struct rpmsg_device *rpdev, + struct rpmsg_channel_info *chinfo) +{ + struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev); + struct virtproc_info *vrp = vch->vrp; + + return rpmsg_unregister_device(&vrp->vdev->dev, chinfo); +} + static struct rpmsg_endpoint *virtio_rpmsg_create_ept(struct rpmsg_device *rpdev, rpmsg_rx_cb_t cb, void *priv, @@ -341,8 +329,8 @@ static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev) struct rpmsg_ns_msg nsm; strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE); - nsm.addr = cpu_to_virtio32(vrp->vdev, rpdev->ept->addr); - nsm.flags = cpu_to_virtio32(vrp->vdev, RPMSG_NS_CREATE); + nsm.addr = cpu_to_rpmsg32(rpdev, rpdev->ept->addr); + nsm.flags = cpu_to_rpmsg32(rpdev, RPMSG_NS_CREATE); err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR); if (err) @@ -365,8 +353,8 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev) struct rpmsg_ns_msg nsm; strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE); - nsm.addr = cpu_to_virtio32(vrp->vdev, rpdev->ept->addr); - nsm.flags = cpu_to_virtio32(vrp->vdev, RPMSG_NS_DESTROY); + nsm.addr = cpu_to_rpmsg32(rpdev, rpdev->ept->addr); + nsm.flags = cpu_to_rpmsg32(rpdev, RPMSG_NS_DESTROY); err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR); if (err) @@ -377,6 +365,8 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev) } static const struct rpmsg_device_ops virtio_rpmsg_ops = { + .create_channel = virtio_rpmsg_create_channel, + .release_channel = virtio_rpmsg_release_channel, .create_ept = virtio_rpmsg_create_ept, .announce_create = virtio_rpmsg_announce_create, .announce_destroy = virtio_rpmsg_announce_destroy, @@ -395,8 +385,8 @@ static void virtio_rpmsg_release_device(struct device *dev) * this function will be used to create both static and dynamic * channels. */ -static struct rpmsg_device *rpmsg_create_channel(struct virtproc_info *vrp, - struct rpmsg_channel_info *chinfo) +static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp, + struct rpmsg_channel_info *chinfo) { struct virtio_rpmsg_channel *vch; struct rpmsg_device *rpdev; @@ -425,6 +415,7 @@ static struct rpmsg_device *rpmsg_create_channel(struct virtproc_info *vrp, rpdev->src = chinfo->src; rpdev->dst = chinfo->dst; rpdev->ops = &virtio_rpmsg_ops; + rpdev->little_endian = virtio_is_little_endian(vrp->vdev); /* * rpmsg server channels has predefined local address (for now), @@ -618,10 +609,10 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev, } } - msg->len = cpu_to_virtio16(vrp->vdev, len); + msg->len = cpu_to_rpmsg16(rpdev, len); msg->flags = 0; - msg->src = cpu_to_virtio32(vrp->vdev, src); - msg->dst = cpu_to_virtio32(vrp->vdev, dst); + msg->src = cpu_to_rpmsg32(rpdev, src); + msg->dst = cpu_to_rpmsg32(rpdev, dst); msg->reserved = 0; memcpy(msg->data, data, len); @@ -710,14 +701,15 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev, { struct rpmsg_endpoint *ept; struct scatterlist sg; - unsigned int msg_len = virtio16_to_cpu(vrp->vdev, msg->len); + bool little_endian = virtio_is_little_endian(vrp->vdev); + unsigned int msg_len = __rpmsg16_to_cpu(little_endian, msg->len); int err; dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n", - virtio32_to_cpu(vrp->vdev, msg->src), - virtio32_to_cpu(vrp->vdev, msg->dst), msg_len, - virtio16_to_cpu(vrp->vdev, msg->flags), - virtio32_to_cpu(vrp->vdev, msg->reserved)); + __rpmsg32_to_cpu(little_endian, msg->src), + __rpmsg32_to_cpu(little_endian, msg->dst), msg_len, + __rpmsg16_to_cpu(little_endian, msg->flags), + __rpmsg32_to_cpu(little_endian, msg->reserved)); #if defined(CONFIG_DYNAMIC_DEBUG) dynamic_hex_dump("rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1, msg, sizeof(*msg) + msg_len, true); @@ -736,7 +728,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev, /* use the dst addr to fetch the callback of the appropriate user */ mutex_lock(&vrp->endpoints_lock); - ept = idr_find(&vrp->endpoints, virtio32_to_cpu(vrp->vdev, msg->dst)); + ept = idr_find(&vrp->endpoints, __rpmsg32_to_cpu(little_endian, msg->dst)); /* let's make sure no one deallocates ept while we use it */ if (ept) @@ -750,7 +742,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev, if (ept->cb) ept->cb(ept->rpdev, msg->data, msg_len, ept->priv, - virtio32_to_cpu(vrp->vdev, msg->src)); + __rpmsg32_to_cpu(little_endian, msg->src)); mutex_unlock(&ept->cb_lock); @@ -821,68 +813,14 @@ static void rpmsg_xmit_done(struct virtqueue *svq) wake_up_interruptible(&vrp->sendq); } -/* invoked when a name service announcement arrives */ -static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, - void *priv, u32 src) -{ - struct rpmsg_ns_msg *msg = data; - struct rpmsg_device *newch; - struct rpmsg_channel_info chinfo; - struct virtproc_info *vrp = priv; - struct device *dev = &vrp->vdev->dev; - int ret; - -#if defined(CONFIG_DYNAMIC_DEBUG) - dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1, - data, len, true); -#endif - - if (len != sizeof(*msg)) { - dev_err(dev, "malformed ns msg (%d)\n", len); - return -EINVAL; - } - - /* - * the name service ept does _not_ belong to a real rpmsg channel, - * and is handled by the rpmsg bus itself. - * for sanity reasons, make sure a valid rpdev has _not_ sneaked - * in somehow. - */ - if (rpdev) { - dev_err(dev, "anomaly: ns ept has an rpdev handle\n"); - return -EINVAL; - } - - /* don't trust the remote processor for null terminating the name */ - msg->name[RPMSG_NAME_SIZE - 1] = '\0'; - - strncpy(chinfo.name, msg->name, sizeof(chinfo.name)); - chinfo.src = RPMSG_ADDR_ANY; - chinfo.dst = virtio32_to_cpu(vrp->vdev, msg->addr); - - dev_info(dev, "%sing channel %s addr 0x%x\n", - virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY ? - "destroy" : "creat", msg->name, chinfo.dst); - - if (virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY) { - ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo); - if (ret) - dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret); - } else { - newch = rpmsg_create_channel(vrp, &chinfo); - if (!newch) - dev_err(dev, "rpmsg_create_channel failed\n"); - } - - return 0; -} - static int rpmsg_probe(struct virtio_device *vdev) { vq_callback_t *vq_cbs[] = { rpmsg_recv_done, rpmsg_xmit_done }; static const char * const names[] = { "input", "output" }; struct virtqueue *vqs[2]; struct virtproc_info *vrp; + struct virtio_rpmsg_channel *vch; + struct rpmsg_device *rpdev_ns; void *bufs_va; int err = 0, i; size_t total_buf_space; @@ -958,14 +896,26 @@ static int rpmsg_probe(struct virtio_device *vdev) /* if supported by the remote processor, enable the name service */ if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_NS)) { - /* a dedicated endpoint handles the name service msgs */ - vrp->ns_ept = __rpmsg_create_ept(vrp, NULL, rpmsg_ns_cb, - vrp, RPMSG_NS_ADDR); - if (!vrp->ns_ept) { - dev_err(&vdev->dev, "failed to create the ns ept\n"); + vch = kzalloc(sizeof(*vch), GFP_KERNEL); + if (!vch) { err = -ENOMEM; goto free_coherent; } + + /* Link the channel to our vrp */ + vch->vrp = vrp; + + /* Assign public information to the rpmsg_device */ + rpdev_ns = &vch->rpdev; + rpdev_ns->ops = &virtio_rpmsg_ops; + rpdev_ns->little_endian = virtio_is_little_endian(vrp->vdev); + + rpdev_ns->dev.parent = &vrp->vdev->dev; + rpdev_ns->dev.release = virtio_rpmsg_release_device; + + err = rpmsg_ns_register_device(rpdev_ns); + if (err) + goto free_coherent; } /* @@ -990,6 +940,7 @@ static int rpmsg_probe(struct virtio_device *vdev) return 0; free_coherent: + kfree(vch); dma_free_coherent(vdev->dev.parent, total_buf_space, bufs_va, vrp->bufs_dma); vqs_del: @@ -1018,9 +969,6 @@ static void rpmsg_remove(struct virtio_device *vdev) if (ret) dev_warn(&vdev->dev, "can't remove rpmsg device: %d\n", ret); - if (vrp->ns_ept) - __rpmsg_destroy_ept(vrp, vrp->ns_ept); - idr_destroy(&vrp->endpoints); vdev->config->del_vqs(vrp->vdev); |