diff options
| -rw-r--r-- | Documentation/ABI/stable/sysfs-firmware-opal-dump | 41 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/opal.h | 14 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-dump.c | 525 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-wrappers.S | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 2 |
6 files changed, 589 insertions, 1 deletions
diff --git a/Documentation/ABI/stable/sysfs-firmware-opal-dump b/Documentation/ABI/stable/sysfs-firmware-opal-dump new file mode 100644 index 000000000000..32fe7f5c4880 --- /dev/null +++ b/Documentation/ABI/stable/sysfs-firmware-opal-dump @@ -0,0 +1,41 @@ +What: /sys/firmware/opal/dump +Date: Feb 2014 +Contact: Stewart Smith <stewart@linux.vnet.ibm.com> +Description: + This directory exposes interfaces for interacting with + the FSP and platform dumps through OPAL firmware interface. + + This is only for the powerpc/powernv platform. + + initiate_dump: When '1' is written to it, + we will initiate a dump. + Read this file for supported commands. + + 0xXX-0xYYYY: A directory for dump of type 0xXX and + id 0xYYYY (in hex). The name of this + directory should not be relied upon to + be in this format, only that it's unique + among all dumps. For determining the type + and ID of the dump, use the id and type files. + Do not rely on any particular size of dump + type or dump id. + + Each dump has the following files: + id: An ASCII representation of the dump ID + in hex (e.g. '0x01') + type: An ASCII representation of the type of + dump in the format "0x%x %s" with the ID + in hex and a description of the dump type + (or 'unknown'). + Type '0xffffffff unknown' is used when + we could not get the type from firmware. + e.g. '0x02 System/Platform Dump' + dump: A binary file containing the dump. + The size of the dump is the size of this file. + acknowledge: When 'ack' is written to this, we will + acknowledge that we've retrieved the + dump to the service processor. It will + then remove it, making the dump + inaccessible. + Reading this file will get a list of + supported actions. diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index 933adde1bdea..2636acfcd340 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -159,9 +159,15 @@ extern int opal_enter_rtas(struct rtas_args *args, #define OPAL_FLASH_VALIDATE 76 #define OPAL_FLASH_MANAGE 77 #define OPAL_FLASH_UPDATE 78 +#define OPAL_DUMP_INIT 81 +#define OPAL_DUMP_INFO 82 +#define OPAL_DUMP_READ 83 +#define OPAL_DUMP_ACK 84 #define OPAL_GET_MSG 85 #define OPAL_CHECK_ASYNC_COMPLETION 86 +#define OPAL_DUMP_RESEND 91 #define OPAL_SYNC_HOST_REBOOT 87 +#define OPAL_DUMP_INFO2 94 #ifndef __ASSEMBLY__ @@ -242,6 +248,7 @@ enum OpalPendingState { OPAL_EVENT_EPOW = 0x80, OPAL_EVENT_LED_STATUS = 0x100, OPAL_EVENT_PCI_ERROR = 0x200, + OPAL_EVENT_DUMP_AVAIL = 0x400, OPAL_EVENT_MSG_PENDING = 0x800, }; @@ -838,6 +845,12 @@ void opal_resend_pending_logs(void); int64_t opal_validate_flash(uint64_t buffer, uint32_t *size, uint32_t *result); int64_t opal_manage_flash(uint8_t op); int64_t opal_update_flash(uint64_t blk_list); +int64_t opal_dump_init(uint8_t dump_type); +int64_t opal_dump_info(uint32_t *dump_id, uint32_t *dump_size); +int64_t opal_dump_info2(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type); +int64_t opal_dump_read(uint32_t dump_id, uint64_t buffer); +int64_t opal_dump_ack(uint32_t dump_id); +int64_t opal_dump_resend_notification(void); int64_t opal_get_msg(uint64_t buffer, size_t size); int64_t opal_check_completion(uint64_t buffer, size_t size, uint64_t token); @@ -876,6 +889,7 @@ extern unsigned long opal_get_boot_time(void); extern void opal_nvram_init(void); extern void opal_flash_init(void); extern int opal_elog_init(void); +extern void opal_platform_dump_init(void); extern int opal_machine_check(struct pt_regs *regs); extern bool opal_mce_check_early_recovery(struct pt_regs *regs); diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile index 189fd4595161..5125caeb40f4 100644 --- a/arch/powerpc/platforms/powernv/Makefile +++ b/arch/powerpc/platforms/powernv/Makefile @@ -1,6 +1,6 @@ obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o -obj-y += rng.o opal-elog.o +obj-y += rng.o opal-elog.o opal-dump.o obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o diff --git a/arch/powerpc/platforms/powernv/opal-dump.c b/arch/powerpc/platforms/powernv/opal-dump.c new file mode 100644 index 000000000000..0c767c561dc9 --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-dump.c @@ -0,0 +1,525 @@ +/* + * PowerNV OPAL Dump Interface + * + * Copyright 2013,2014 IBM Corp. + * + * 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. + */ + +#include <linux/kobject.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/pagemap.h> +#include <linux/delay.h> + +#include <asm/opal.h> + +#define DUMP_TYPE_FSP 0x01 + +struct dump_obj { + struct kobject kobj; + struct bin_attribute dump_attr; + uint32_t id; /* becomes object name */ + uint32_t type; + uint32_t size; + char *buffer; +}; +#define to_dump_obj(x) container_of(x, struct dump_obj, kobj) + +struct dump_attribute { + struct attribute attr; + ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr, + char *buf); + ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr, + const char *buf, size_t count); +}; +#define to_dump_attr(x) container_of(x, struct dump_attribute, attr) + +static ssize_t dump_id_show(struct dump_obj *dump_obj, + struct dump_attribute *attr, + char *buf) +{ + return sprintf(buf, "0x%x\n", dump_obj->id); +} + +static const char* dump_type_to_string(uint32_t type) +{ + switch (type) { + case 0x01: return "SP Dump"; + case 0x02: return "System/Platform Dump"; + case 0x03: return "SMA Dump"; + default: return "unknown"; + } +} + +static ssize_t dump_type_show(struct dump_obj *dump_obj, + struct dump_attribute *attr, + char *buf) +{ + + return sprintf(buf, "0x%x %s\n", dump_obj->type, + dump_type_to_string(dump_obj->type)); +} + +static ssize_t dump_ack_show(struct dump_obj *dump_obj, + struct dump_attribute *attr, + char *buf) +{ + return sprintf(buf, "ack - acknowledge dump\n"); +} + +/* + * Send acknowledgement to OPAL + */ +static int64_t dump_send_ack(uint32_t dump_id) +{ + int rc; + + rc = opal_dump_ack(dump_id); + if (rc) + pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n", + __func__, dump_id, rc); + return rc; +} + +static void delay_release_kobj(void *kobj) +{ + kobject_put((struct kobject *)kobj); +} + +static ssize_t dump_ack_store(struct dump_obj *dump_obj, + struct dump_attribute *attr, + const char *buf, + size_t count) +{ + dump_send_ack(dump_obj->id); + sysfs_schedule_callback(&dump_obj->kobj, delay_release_kobj, + &dump_obj->kobj, THIS_MODULE); + return count; +} + +/* Attributes of a dump + * The binary attribute of the dump itself is dynamic + * due to the dynamic size of the dump + */ +static struct dump_attribute id_attribute = + __ATTR(id, 0666, dump_id_show, NULL); +static struct dump_attribute type_attribute = + __ATTR(type, 0666, dump_type_show, NULL); +static struct dump_attribute ack_attribute = + __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store); + +static ssize_t init_dump_show(struct dump_obj *dump_obj, + struct dump_attribute *attr, + char *buf) +{ + return sprintf(buf, "1 - initiate dump\n"); +} + +static int64_t dump_fips_init(uint8_t type) +{ + int rc; + + rc = opal_dump_init(type); + if (rc) + pr_warn("%s: Failed to initiate FipS dump (%d)\n", + __func__, rc); + return rc; +} + +static ssize_t init_dump_store(struct dump_obj *dump_obj, + struct dump_attribute *attr, + const char *buf, + size_t count) +{ + dump_fips_init(DUMP_TYPE_FSP); + pr_info("%s: Initiated FSP dump\n", __func__); + return count; +} + +static struct dump_attribute initiate_attribute = + __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store); + +static struct attribute *initiate_attrs[] = { + &initiate_attribute.attr, + NULL, +}; + +static struct attribute_group initiate_attr_group = { + .attrs = initiate_attrs, +}; + +static struct kset *dump_kset; + +static ssize_t dump_attr_show(struct kobject *kobj, + struct attribute *attr, + char *buf) +{ + struct dump_attribute *attribute; + struct dump_obj *dump; + + attribute = to_dump_attr(attr); + dump = to_dump_obj(kobj); + + if (!attribute->show) + return -EIO; + + return attribute->show(dump, attribute, buf); +} + +static ssize_t dump_attr_store(struct kobject *kobj, + struct attribute *attr, + const char *buf, size_t len) +{ + struct dump_attribute *attribute; + struct dump_obj *dump; + + attribute = to_dump_attr(attr); + dump = to_dump_obj(kobj); + + if (!attribute->store) + return -EIO; + + return attribute->store(dump, attribute, buf, len); +} + +static const struct sysfs_ops dump_sysfs_ops = { + .show = dump_attr_show, + .store = dump_attr_store, +}; + +static void dump_release(struct kobject *kobj) +{ + struct dump_obj *dump; + + dump = to_dump_obj(kobj); + vfree(dump->buffer); + kfree(dump); +} + +static struct attribute *dump_default_attrs[] = { + &id_attribute.attr, + &type_attribute.attr, + &ack_attribute.attr, + NULL, +}; + +static struct kobj_type dump_ktype = { + .sysfs_ops = &dump_sysfs_ops, + .release = &dump_release, + .default_attrs = dump_default_attrs, +}; + +static void free_dump_sg_list(struct opal_sg_list *list) +{ + struct opal_sg_list *sg1; + while (list) { + sg1 = list->next; + kfree(list); + list = sg1; + } + list = NULL; +} + +static struct opal_sg_list *dump_data_to_sglist(struct dump_obj *dump) +{ + struct opal_sg_list *sg1, *list = NULL; + void *addr; + int64_t size; + + addr = dump->buffer; + size = dump->size; + + sg1 = kzalloc(PAGE_SIZE, GFP_KERNEL); + if (!sg1) + goto nomem; + + list = sg1; + sg1->num_entries = 0; + while (size > 0) { + /* Translate virtual address to physical address */ + sg1->entry[sg1->num_entries].data = + (void *)(vmalloc_to_pfn(addr) << PAGE_SHIFT); + + if (size > PAGE_SIZE) + sg1->entry[sg1->num_entries].length = PAGE_SIZE; + else + sg1->entry[sg1->num_entries].length = size; + + sg1->num_entries++; + if (sg1->num_entries >= SG_ENTRIES_PER_NODE) { + sg1->next = kzalloc(PAGE_SIZE, GFP_KERNEL); + if (!sg1->next) + goto nomem; + + sg1 = sg1->next; + sg1->num_entries = 0; + } + addr += PAGE_SIZE; + size -= PAGE_SIZE; + } + return list; + +nomem: + pr_err("%s : Failed to allocate memory\n", __func__); + free_dump_sg_list(list); + return NULL; +} + +static void sglist_to_phy_addr(struct opal_sg_list *list) +{ + struct opal_sg_list *sg, *next; + + for (sg = list; sg; sg = next) { + next = sg->next; + /* Don't translate NULL pointer for last entry */ + if (sg->next) + sg->next = (struct opal_sg_list *)__pa(sg->next); + else + sg->next = NULL; + + /* Convert num_entries to length */ + sg->num_entries = + sg->num_entries * sizeof(struct opal_sg_entry) + 16; + } +} + +static int64_t dump_read_info(uint32_t *id, uint32_t *size, uint32_t *type) +{ + int rc; + *type = 0xffffffff; + + rc = opal_dump_info2(id, size, type); + + if (rc == OPAL_PARAMETER) + rc = opal_dump_info(id, size); + + if (rc) + pr_warn("%s: Failed to get dump info (%d)\n", + __func__, rc); + return rc; +} + +static int64_t dump_read_data(struct dump_obj *dump) +{ + struct opal_sg_list *list; + uint64_t addr; + int64_t rc; + + /* Allocate memory */ + dump->buffer = vzalloc(PAGE_ALIGN(dump->size)); + if (!dump->buffer) { + pr_err("%s : Failed to allocate memory\n", __func__); + rc = -ENOMEM; + goto out; + } + + /* Generate SG list */ + list = dump_data_to_sglist(dump); + if (!list) { + rc = -ENOMEM; + goto out; + } + + /* Translate sg list addr to real address */ + sglist_to_phy_addr(list); + + /* First entry address */ + addr = __pa(list); + + /* Fetch data */ + rc = OPAL_BUSY_EVENT; + while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { + rc = opal_dump_read(dump->id, addr); + if (rc == OPAL_BUSY_EVENT) { + opal_poll_events(NULL); + msleep(20); + } + } + + if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) + pr_warn("%s: Extract dump failed for ID 0x%x\n", + __func__, dump->id); + + /* Free SG list */ + free_dump_sg_list(list); + +out: + return rc; +} + +static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buffer, loff_t pos, size_t count) +{ + ssize_t rc; + + struct dump_obj *dump = to_dump_obj(kobj); + + if (!dump->buffer) { + rc = dump_read_data(dump); + + if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) { + vfree(dump->buffer); + dump->buffer = NULL; + + return -EIO; + } + if (rc == OPAL_PARTIAL) { + /* On a partial read, we just return EIO + * and rely on userspace to ask us to try + * again. + */ + pr_info("%s: Platform dump partially read.ID = 0x%x\n", + __func__, dump->id); + return -EIO; + } + } + + memcpy(buffer, dump->buffer + pos, count); + + /* You may think we could free the dump buffer now and retrieve + * it again later if needed, but due to current firmware limitation, + * that's not the case. So, once read into userspace once, + * we keep the dump around until it's acknowledged by userspace. + */ + + return count; +} + +static struct dump_obj *create_dump_obj(uint32_t id, size_t size, + uint32_t type) +{ + struct dump_obj *dump; + int rc; + + dump = kzalloc(sizeof(*dump), GFP_KERNEL); + if (!dump) + return NULL; + + dump->kobj.kset = dump_kset; + + kobject_init(&dump->kobj, &dump_ktype); + + sysfs_bin_attr_init(&dump->dump_attr); + + dump->dump_attr.attr.name = "dump"; + dump->dump_attr.attr.mode = 0400; + dump->dump_attr.size = size; + dump->dump_attr.read = dump_attr_read; + + dump->id = id; + dump->size = size; + dump->type = type; + + rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id); + if (rc) { + kobject_put(&dump->kobj); + return NULL; + } + + rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr); + if (rc) { + kobject_put(&dump->kobj); + return NULL; + } + + pr_info("%s: New platform dump. ID = 0x%x Size %u\n", + __func__, dump->id, dump->size); + + kobject_uevent(&dump->kobj, KOBJ_ADD); + + return dump; +} + +static int process_dump(void) +{ + int rc; + uint32_t dump_id, dump_size, dump_type; + struct dump_obj *dump; + char name[22]; + + rc = dump_read_info(&dump_id, &dump_size, &dump_type); + if (rc != OPAL_SUCCESS) + return rc; + + sprintf(name, "0x%x-0x%x", dump_type, dump_id); + + /* we may get notified twice, let's handle + * that gracefully and not create two conflicting + * entries. + */ + if (kset_find_obj(dump_kset, name)) + return 0; + + dump = create_dump_obj(dump_id, dump_size, dump_type); + if (!dump) + return -1; + + return 0; +} + +static void dump_work_fn(struct work_struct *work) +{ + process_dump(); +} + +static DECLARE_WORK(dump_work, dump_work_fn); + +static void schedule_process_dump(void) +{ + schedule_work(&dump_work); +} + +/* + * New dump available notification + * + * Once we get notification, we add sysfs entries for it. + * We only fetch the dump on demand, and create sysfs asynchronously. + */ +static int dump_event(struct notifier_block *nb, + unsigned long events, void *change) +{ + if (events & OPAL_EVENT_DUMP_AVAIL) + schedule_process_dump(); + + return 0; +} + +static struct notifier_block dump_nb = { + .notifier_call = dump_event, + .next = NULL, + .priority = 0 +}; + +void __init opal_platform_dump_init(void) +{ + int rc; + + dump_kset = kset_create_and_add("dump", NULL, opal_kobj); + if (!dump_kset) { + pr_warn("%s: Failed to create dump kset\n", __func__); + return; + } + + rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group); + if (rc) { + pr_warn("%s: Failed to create initiate dump attr group\n", + __func__); + kobject_put(&dump_kset->kobj); + return; + } + + rc = opal_notifier_register(&dump_nb); + if (rc) { + pr_warn("%s: Can't register OPAL event notifier (%d)\n", + __func__, rc); + return; + } + + opal_dump_resend_notification(); +} diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index 5fcbf253a870..47ec3f738062 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -131,6 +131,12 @@ OPAL_CALL(opal_write_elog, OPAL_ELOG_WRITE); OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE); OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE); OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE); +OPAL_CALL(opal_dump_init, OPAL_DUMP_INIT); +OPAL_CALL(opal_dump_info, OPAL_DUMP_INFO); +OPAL_CALL(opal_dump_info2, OPAL_DUMP_INFO2); +OPAL_CALL(opal_dump_read, OPAL_DUMP_READ); +OPAL_CALL(opal_dump_ack, OPAL_DUMP_ACK); OPAL_CALL(opal_get_msg, OPAL_GET_MSG); OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION); +OPAL_CALL(opal_dump_resend_notification, OPAL_DUMP_RESEND); OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT); diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 0a4493895d16..2e269c27dd23 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -570,6 +570,8 @@ static int __init opal_init(void) rc = opal_elog_init(); /* Setup code update interface */ opal_flash_init(); + /* Setup platform dump extract interface */ + opal_platform_dump_init(); } return 0; |