diff options
Diffstat (limited to 'drivers/acpi/apei/einj.c')
| -rw-r--r-- | drivers/acpi/apei/einj.c | 486 |
1 files changed, 486 insertions, 0 deletions
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c new file mode 100644 index 000000000000..4ccebd8f930a --- /dev/null +++ b/drivers/acpi/apei/einj.c @@ -0,0 +1,486 @@ +/* + * APEI Error INJection support + * + * EINJ provides a hardware error injection mechanism, this is useful + * for debugging and testing of other APEI and RAS features. + * + * For more information about EINJ, please refer to ACPI Specification + * version 4.0, section 17.5. + * + * Copyright 2009 Intel Corp. + * Author: Huang Ying <ying.huang@intel.com> + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/nmi.h> +#include <linux/delay.h> +#include <acpi/acpi.h> + +#include "apei-internal.h" + +#define EINJ_PFX "EINJ: " + +#define SPIN_UNIT 100 /* 100ns */ +/* Firmware should respond within 1 miliseconds */ +#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) + +#define EINJ_OP_BUSY 0x1 +#define EINJ_STATUS_SUCCESS 0x0 +#define EINJ_STATUS_FAIL 0x1 +#define EINJ_STATUS_INVAL 0x2 + +#define EINJ_TAB_ENTRY(tab) \ + ((struct acpi_whea_header *)((char *)(tab) + \ + sizeof(struct acpi_table_einj))) + +static struct acpi_table_einj *einj_tab; + +static struct apei_resources einj_resources; + +static struct apei_exec_ins_type einj_ins_type[] = { + [ACPI_EINJ_READ_REGISTER] = { + .flags = APEI_EXEC_INS_ACCESS_REGISTER, + .run = apei_exec_read_register, + }, + [ACPI_EINJ_READ_REGISTER_VALUE] = { + .flags = APEI_EXEC_INS_ACCESS_REGISTER, + .run = apei_exec_read_register_value, + }, + [ACPI_EINJ_WRITE_REGISTER] = { + .flags = APEI_EXEC_INS_ACCESS_REGISTER, + .run = apei_exec_write_register, + }, + [ACPI_EINJ_WRITE_REGISTER_VALUE] = { + .flags = APEI_EXEC_INS_ACCESS_REGISTER, + .run = apei_exec_write_register_value, + }, + [ACPI_EINJ_NOOP] = { + .flags = 0, + .run = apei_exec_noop, + }, +}; + +/* + * Prevent EINJ interpreter to run simultaneously, because the + * corresponding firmware implementation may not work properly when + * invoked simultaneously. + */ +static DEFINE_MUTEX(einj_mutex); + +static void einj_exec_ctx_init(struct apei_exec_context *ctx) +{ + apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type), + EINJ_TAB_ENTRY(einj_tab), einj_tab->entries); +} + +static int __einj_get_available_error_type(u32 *type) +{ + struct apei_exec_context ctx; + int rc; + + einj_exec_ctx_init(&ctx); + rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE); + if (rc) + return rc; + *type = apei_exec_ctx_get_output(&ctx); + + return 0; +} + +/* Get error injection capabilities of the platform */ +static int einj_get_available_error_type(u32 *type) +{ + int rc; + + mutex_lock(&einj_mutex); + rc = __einj_get_available_error_type(type); + mutex_unlock(&einj_mutex); + + return rc; +} + +static int einj_timedout(u64 *t) +{ + if ((s64)*t < SPIN_UNIT) { + pr_warning(FW_WARN EINJ_PFX + "Firmware does not respond in time\n"); + return 1; + } + *t -= SPIN_UNIT; + ndelay(SPIN_UNIT); + touch_nmi_watchdog(); + return 0; +} + +/* do sanity check to trigger table */ +static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab) +{ + if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger)) + return -EINVAL; + if (trigger_tab->table_size > PAGE_SIZE || + trigger_tab->table_size <= trigger_tab->header_size) + return -EINVAL; + if (trigger_tab->entry_count != + (trigger_tab->table_size - trigger_tab->header_size) / + sizeof(struct acpi_einj_entry)) + return -EINVAL; + + return 0; +} + +/* Execute instructions in trigger error action table */ +static int __einj_error_trigger(u64 trigger_paddr) +{ + struct acpi_einj_trigger *trigger_tab = NULL; + struct apei_exec_context trigger_ctx; + struct apei_resources trigger_resources; + struct acpi_whea_header *trigger_entry; + struct resource *r; + u32 table_size; + int rc = -EIO; + + r = request_mem_region(trigger_paddr, sizeof(*trigger_tab), + "APEI EINJ Trigger Table"); + if (!r) { + pr_err(EINJ_PFX + "Can not request iomem region <%016llx-%016llx> for Trigger table.\n", + (unsigned long long)trigger_paddr, + (unsigned long long)trigger_paddr+sizeof(*trigger_tab)); + goto out; + } + trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab)); + if (!trigger_tab) { + pr_err(EINJ_PFX "Failed to map trigger table!\n"); + goto out_rel_header; + } + rc = einj_check_trigger_header(trigger_tab); + if (rc) { + pr_warning(FW_BUG EINJ_PFX + "The trigger error action table is invalid\n"); + goto out_rel_header; + } + rc = -EIO; + table_size = trigger_tab->table_size; + r = request_mem_region(trigger_paddr + sizeof(*trigger_tab), + table_size - sizeof(*trigger_tab), + "APEI EINJ Trigger Table"); + if (!r) { + pr_err(EINJ_PFX +"Can not request iomem region <%016llx-%016llx> for Trigger Table Entry.\n", + (unsigned long long)trigger_paddr+sizeof(*trigger_tab), + (unsigned long long)trigger_paddr + table_size); + goto out_rel_header; + } + iounmap(trigger_tab); + trigger_tab = ioremap_cache(trigger_paddr, table_size); + if (!trigger_tab) { + pr_err(EINJ_PFX "Failed to map trigger table!\n"); + goto out_rel_entry; + } + trigger_entry = (struct acpi_whea_header *) + ((char *)trigger_tab + sizeof(struct acpi_einj_trigger)); + apei_resources_init(&trigger_resources); + apei_exec_ctx_init(&trigger_ctx, einj_ins_type, + ARRAY_SIZE(einj_ins_type), + trigger_entry, trigger_tab->entry_count); + rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources); + if (rc) + goto out_fini; + rc = apei_resources_sub(&trigger_resources, &einj_resources); + if (rc) + goto out_fini; + rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger"); + if (rc) + goto out_fini; + rc = apei_exec_pre_map_gars(&trigger_ctx); + if (rc) + goto out_release; + + rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR); + + apei_exec_post_unmap_gars(&trigger_ctx); +out_release: + apei_resources_release(&trigger_resources); +out_fini: + apei_resources_fini(&trigger_resources); +out_rel_entry: + release_mem_region(trigger_paddr + sizeof(*trigger_tab), + table_size - sizeof(*trigger_tab)); +out_rel_header: + release_mem_region(trigger_paddr, sizeof(*trigger_tab)); +out: + if (trigger_tab) + iounmap(trigger_tab); + + return rc; +} + +static int __einj_error_inject(u32 type) +{ + struct apei_exec_context ctx; + u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT; + int rc; + + einj_exec_ctx_init(&ctx); + + rc = apei_exec_run(&ctx, ACPI_EINJ_BEGIN_OPERATION); + if (rc) + return rc; + apei_exec_ctx_set_input(&ctx, type); + rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE); + if (rc) + return rc; + rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION); + if (rc) + return rc; + for (;;) { + rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS); + if (rc) + return rc; + val = apei_exec_ctx_get_output(&ctx); + if (!(val & EINJ_OP_BUSY)) + break; + if (einj_timedout(&timeout)) + return -EIO; + } + rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS); + if (rc) + return rc; + val = apei_exec_ctx_get_output(&ctx); + if (val != EINJ_STATUS_SUCCESS) + return -EBUSY; + + rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE); + if (rc) + return rc; + trigger_paddr = apei_exec_ctx_get_output(&ctx); + rc = __einj_error_trigger(trigger_paddr); + if (rc) + return rc; + rc = apei_exec_run(&ctx, ACPI_EINJ_END_OPERATION); + + return rc; +} + +/* Inject the specified hardware error */ +static int einj_error_inject(u32 type) +{ + int rc; + + mutex_lock(&einj_mutex); + rc = __einj_error_inject(type); + mutex_unlock(&einj_mutex); + + return rc; +} + +static u32 error_type; +static struct dentry *einj_debug_dir; + +static int available_error_type_show(struct seq_file *m, void *v) +{ + int rc; + u32 available_error_type = 0; + + rc = einj_get_available_error_type(&available_error_type); + if (rc) + return rc; + if (available_error_type & 0x0001) + seq_printf(m, "0x00000001\tProcessor Correctable\n"); + if (available_error_type & 0x0002) + seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n"); + if (available_error_type & 0x0004) + seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n"); + if (available_error_type & 0x0008) + seq_printf(m, "0x00000008\tMemory Correctable\n"); + if (available_error_type & 0x0010) + seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n"); + if (available_error_type & 0x0020) + seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n"); + if (available_error_type & 0x0040) + seq_printf(m, "0x00000040\tPCI Express Correctable\n"); + if (available_error_type & 0x0080) + seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n"); + if (available_error_type & 0x0100) + seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n"); + if (available_error_type & 0x0200) + seq_printf(m, "0x00000200\tPlatform Correctable\n"); + if (available_error_type & 0x0400) + seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n"); + if (available_error_type & 0x0800) + seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n"); + + return 0; +} + +static int available_error_type_open(struct inode *inode, struct file *file) +{ + return single_open(file, available_error_type_show, NULL); +} + +static const struct file_operations available_error_type_fops = { + .open = available_error_type_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int error_type_get(void *data, u64 *val) +{ + *val = error_type; + + return 0; +} + +static int error_type_set(void *data, u64 val) +{ + int rc; + u32 available_error_type = 0; + + /* Only one error type can be specified */ + if (val & (val - 1)) + return -EINVAL; + rc = einj_get_available_error_type(&available_error_type); + if (rc) + return rc; + if (!(val & available_error_type)) + return -EINVAL; + error_type = val; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get, + error_type_set, "0x%llx\n"); + +static int error_inject_set(void *data, u64 val) +{ + if (!error_type) + return -EINVAL; + + return einj_error_inject(error_type); +} + +DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL, + error_inject_set, "%llu\n"); + +static int einj_check_table(struct acpi_table_einj *einj_tab) +{ + if (einj_tab->header_length != sizeof(struct acpi_table_einj)) + return -EINVAL; + if (einj_tab->header.length < sizeof(struct acpi_table_einj)) + return -EINVAL; + if (einj_tab->entries != + (einj_tab->header.length - sizeof(struct acpi_table_einj)) / + sizeof(struct acpi_einj_entry)) + return -EINVAL; + + return 0; +} + +static int __init einj_init(void) +{ + int rc; + acpi_status status; + struct dentry *fentry; + struct apei_exec_context ctx; + + if (acpi_disabled) + return -ENODEV; + + status = acpi_get_table(ACPI_SIG_EINJ, 0, + (struct acpi_table_header **)&einj_tab); + if (status == AE_NOT_FOUND) { + pr_info(EINJ_PFX "Table is not found!\n"); + return -ENODEV; + } else if (ACPI_FAILURE(status)) { + const char *msg = acpi_format_exception(status); + pr_err(EINJ_PFX "Failed to get table, %s\n", msg); + return -EINVAL; + } + + rc = einj_check_table(einj_tab); + if (rc) { + pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n"); + return -EINVAL; + } + + rc = -ENOMEM; + einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir()); + if (!einj_debug_dir) + goto err_cleanup; + fentry = debugfs_create_file("available_error_type", S_IRUSR, + einj_debug_dir, NULL, + &available_error_type_fops); + if (!fentry) + goto err_cleanup; + fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR, + einj_debug_dir, NULL, &error_type_fops); + if (!fentry) + goto err_cleanup; + fentry = debugfs_create_file("error_inject", S_IWUSR, + einj_debug_dir, NULL, &error_inject_fops); + if (!fentry) + goto err_cleanup; + + apei_resources_init(&einj_resources); + einj_exec_ctx_init(&ctx); + rc = apei_exec_collect_resources(&ctx, &einj_resources); + if (rc) + goto err_fini; + rc = apei_resources_request(&einj_resources, "APEI EINJ"); + if (rc) + goto err_fini; + rc = apei_exec_pre_map_gars(&ctx); + if (rc) + goto err_release; + + pr_info(EINJ_PFX "Error INJection is initialized.\n"); + + return 0; + +err_release: + apei_resources_release(&einj_resources); +err_fini: + apei_resources_fini(&einj_resources); +err_cleanup: + debugfs_remove_recursive(einj_debug_dir); + + return rc; +} + +static void __exit einj_exit(void) +{ + struct apei_exec_context ctx; + + einj_exec_ctx_init(&ctx); + apei_exec_post_unmap_gars(&ctx); + apei_resources_release(&einj_resources); + apei_resources_fini(&einj_resources); + debugfs_remove_recursive(einj_debug_dir); +} + +module_init(einj_init); +module_exit(einj_exit); + +MODULE_AUTHOR("Huang Ying"); +MODULE_DESCRIPTION("APEI Error INJection support"); +MODULE_LICENSE("GPL"); |