diff options
| -rw-r--r-- | arch/x86/include/asm/mce.h | 8 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce-apei.c | 52 | ||||
| -rw-r--r-- | drivers/acpi/apei/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/acpi/apei/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/apei/ghes.c | 427 |
6 files changed, 504 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index 6c3fdd631ed..f32a4301c4d 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -225,5 +225,13 @@ extern void mcheck_intel_therm_init(void); static inline void mcheck_intel_therm_init(void) { } #endif +/* + * Used by APEI to report memory error via /dev/mcelog + */ + +struct cper_sec_mem_err; +extern void apei_mce_report_mem_error(int corrected, + struct cper_sec_mem_err *mem_err); + #endif /* __KERNEL__ */ #endif /* _ASM_X86_MCE_H */ diff --git a/arch/x86/kernel/cpu/mcheck/Makefile b/arch/x86/kernel/cpu/mcheck/Makefile index 4ac6d48fe11..bb34b03af25 100644 --- a/arch/x86/kernel/cpu/mcheck/Makefile +++ b/arch/x86/kernel/cpu/mcheck/Makefile @@ -7,3 +7,5 @@ obj-$(CONFIG_X86_MCE_THRESHOLD) += threshold.o obj-$(CONFIG_X86_MCE_INJECT) += mce-inject.o obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o + +obj-$(CONFIG_ACPI_APEI) += mce-apei.o diff --git a/arch/x86/kernel/cpu/mcheck/mce-apei.c b/arch/x86/kernel/cpu/mcheck/mce-apei.c new file mode 100644 index 00000000000..4eccd1fadb1 --- /dev/null +++ b/arch/x86/kernel/cpu/mcheck/mce-apei.c @@ -0,0 +1,52 @@ +/* + * Bridge between MCE and APEI + * + * On some machine, corrected memory errors are reported via APEI + * generic hardware error source (GHES) instead of corrected Machine + * Check. These corrected memory errors can be reported to user space + * through /dev/mcelog via faking a corrected Machine Check, so that + * the error memory page can be offlined by /sbin/mcelog if the error + * count for one page is beyond the threshold. + * + * Copyright 2010 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/acpi.h> +#include <linux/cper.h> +#include <acpi/apei.h> +#include <asm/mce.h> + +#include "mce-internal.h" + +void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err) +{ + struct mce m; + + /* Only corrected MC is reported */ + if (!corrected) + return; + + mce_setup(&m); + m.bank = 1; + /* Fake a memory read corrected error with unknown channel */ + m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV | 0x9f; + m.addr = mem_err->physical_addr; + mce_log(&m); + mce_notify_irq(); +} +EXPORT_SYMBOL_GPL(apei_mce_report_mem_error); diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig index 5f0a41c2bc6..f8c668f27b5 100644 --- a/drivers/acpi/apei/Kconfig +++ b/drivers/acpi/apei/Kconfig @@ -7,6 +7,20 @@ config ACPI_APEI especially. In addition it supports error serialization and error injection. +config ACPI_APEI_GHES + tristate "APEI Generic Hardware Error Source" + depends on ACPI_APEI && X86 + select ACPI_HED + help + Generic Hardware Error Source provides a way to report + platform hardware errors (such as that from chipset). It + works in so called "Firmware First" mode, that is, hardware + errors are reported to firmware firstly, then reported to + Linux by firmware. This way, some non-standard hardware + error registers or non-standard hardware link can be checked + by firmware to produce more valuable hardware error + information for Linux. + config ACPI_APEI_EINJ tristate "APEI Error INJection (EINJ)" depends on ACPI_APEI && DEBUG_FS diff --git a/drivers/acpi/apei/Makefile b/drivers/acpi/apei/Makefile index fef963ec536..41c61db4c51 100644 --- a/drivers/acpi/apei/Makefile +++ b/drivers/acpi/apei/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_ACPI_APEI) += apei.o +obj-$(CONFIG_ACPI_APEI_GHES) += ghes.o obj-$(CONFIG_ACPI_APEI_EINJ) += einj.o apei-y := apei-base.o hest.o cper.o diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c new file mode 100644 index 00000000000..fd0cc016a09 --- /dev/null +++ b/drivers/acpi/apei/ghes.c @@ -0,0 +1,427 @@ +/* + * APEI Generic Hardware Error Source support + * + * Generic Hardware Error Source provides a way to report platform + * hardware errors (such as that from chipset). It works in so called + * "Firmware First" mode, that is, hardware errors are reported to + * firmware firstly, then reported to Linux by firmware. This way, + * some non-standard hardware error registers or non-standard hardware + * link can be checked by firmware to produce more hardware error + * information for Linux. + * + * For more information about Generic Hardware Error Source, please + * refer to ACPI Specification version 4.0, section 17.3.2.6 + * + * Now, only SCI notification type and memory errors are + * supported. More notification type and hardware error type will be + * added later. + * + * Copyright 2010 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/acpi.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/cper.h> +#include <linux/kdebug.h> +#include <acpi/apei.h> +#include <acpi/atomicio.h> +#include <acpi/hed.h> +#include <asm/mce.h> + +#include "apei-internal.h" + +#define GHES_PFX "GHES: " + +#define GHES_ESTATUS_MAX_SIZE 65536 + +/* + * One struct ghes is created for each generic hardware error + * source. + * + * It provides the context for APEI hardware error timer/IRQ/SCI/NMI + * handler. Handler for one generic hardware error source is only + * triggered after the previous one is done. So handler can uses + * struct ghes without locking. + * + * estatus: memory buffer for error status block, allocated during + * HEST parsing. + */ +#define GHES_TO_CLEAR 0x0001 + +struct ghes { + struct acpi_hest_generic *generic; + struct acpi_hest_generic_status *estatus; + struct list_head list; + u64 buffer_paddr; + unsigned long flags; +}; + +/* + * Error source lists, one list for each notification method. The + * members in lists are struct ghes. + * + * The list members are only added in HEST parsing and deleted during + * module_exit, that is, single-threaded. So no lock is needed for + * that. + * + * But the mutual exclusion is needed between members adding/deleting + * and timer/IRQ/SCI/NMI handler, which may traverse the list. RCU is + * used for that. + */ +static LIST_HEAD(ghes_sci); + +static struct ghes *ghes_new(struct acpi_hest_generic *generic) +{ + struct ghes *ghes; + unsigned int error_block_length; + int rc; + + ghes = kzalloc(sizeof(*ghes), GFP_KERNEL); + if (!ghes) + return ERR_PTR(-ENOMEM); + ghes->generic = generic; + INIT_LIST_HEAD(&ghes->list); + rc = acpi_pre_map_gar(&generic->error_status_address); + if (rc) + goto err_free; + error_block_length = generic->error_block_length; + if (error_block_length > GHES_ESTATUS_MAX_SIZE) { + pr_warning(FW_WARN GHES_PFX + "Error status block length is too long: %u for " + "generic hardware error source: %d.\n", + error_block_length, generic->header.source_id); + error_block_length = GHES_ESTATUS_MAX_SIZE; + } + ghes->estatus = kmalloc(error_block_length, GFP_KERNEL); + if (!ghes->estatus) { + rc = -ENOMEM; + goto err_unmap; + } + + return ghes; + +err_unmap: + acpi_post_unmap_gar(&generic->error_status_address); +err_free: + kfree(ghes); + return ERR_PTR(rc); +} + +static void ghes_fini(struct ghes *ghes) +{ + kfree(ghes->estatus); + acpi_post_unmap_gar(&ghes->generic->error_status_address); +} + +enum { + GHES_SER_NO = 0x0, + GHES_SER_CORRECTED = 0x1, + GHES_SER_RECOVERABLE = 0x2, + GHES_SER_PANIC = 0x3, +}; + +static inline int ghes_severity(int severity) +{ + switch (severity) { + case CPER_SER_INFORMATIONAL: + return GHES_SER_NO; + case CPER_SER_CORRECTED: + return GHES_SER_CORRECTED; + case CPER_SER_RECOVERABLE: + return GHES_SER_RECOVERABLE; + case CPER_SER_FATAL: + return GHES_SER_PANIC; + default: + /* Unkown, go panic */ + return GHES_SER_PANIC; + } +} + +/* SCI handler run in work queue, so ioremap can be used here */ +static int ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len, + int from_phys) +{ + void *vaddr; + + vaddr = ioremap_cache(paddr, len); + if (!vaddr) + return -ENOMEM; + if (from_phys) + memcpy(buffer, vaddr, len); + else + memcpy(vaddr, buffer, len); + iounmap(vaddr); + + return 0; +} + +static int ghes_read_estatus(struct ghes *ghes, int silent) +{ + struct acpi_hest_generic *g = ghes->generic; + u64 buf_paddr; + u32 len; + int rc; + + rc = acpi_atomic_read(&buf_paddr, &g->error_status_address); + if (rc) { + if (!silent && printk_ratelimit()) + pr_warning(FW_WARN GHES_PFX +"Failed to read error status block address for hardware error source: %d.\n", + g->header.source_id); + return -EIO; + } + if (!buf_paddr) + return -ENOENT; + + rc = ghes_copy_tofrom_phys(ghes->estatus, buf_paddr, + sizeof(*ghes->estatus), 1); + if (rc) + return rc; + if (!ghes->estatus->block_status) + return -ENOENT; + + ghes->buffer_paddr = buf_paddr; + ghes->flags |= GHES_TO_CLEAR; + + rc = -EIO; + len = apei_estatus_len(ghes->estatus); + if (len < sizeof(*ghes->estatus)) + goto err_read_block; + if (len > ghes->generic->error_block_length) + goto err_read_block; + if (apei_estatus_check_header(ghes->estatus)) + goto err_read_block; + rc = ghes_copy_tofrom_phys(ghes->estatus + 1, + buf_paddr + sizeof(*ghes->estatus), + len - sizeof(*ghes->estatus), 1); + if (rc) + return rc; + if (apei_estatus_check(ghes->estatus)) + goto err_read_block; + rc = 0; + +err_read_block: + if (rc && !silent) + pr_warning(FW_WARN GHES_PFX + "Failed to read error status block!\n"); + return rc; +} + +static void ghes_clear_estatus(struct ghes *ghes) +{ + ghes->estatus->block_status = 0; + if (!(ghes->flags & GHES_TO_CLEAR)) + return; + ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr, + sizeof(ghes->estatus->block_status), 0); + ghes->flags &= ~GHES_TO_CLEAR; +} + +static void ghes_do_proc(struct ghes *ghes) +{ + int ser, processed = 0; + struct acpi_hest_generic_data *gdata; + + ser = ghes_severity(ghes->estatus->error_severity); + apei_estatus_for_each_section(ghes->estatus, gdata) { +#ifdef CONFIG_X86_MCE + if (!uuid_le_cmp(*(uuid_le *)gdata->section_type, + CPER_SEC_PLATFORM_MEM)) { + apei_mce_report_mem_error( + ser == GHES_SER_CORRECTED, + (struct cper_sec_mem_err *)(gdata+1)); + processed = 1; + } +#endif + } + + if (!processed && printk_ratelimit()) + pr_warning(GHES_PFX + "Unknown error record from generic hardware error source: %d\n", + ghes->generic->header.source_id); +} + +static int ghes_proc(struct ghes *ghes) +{ + int rc; + + rc = ghes_read_estatus(ghes, 0); + if (rc) + goto out; + ghes_do_proc(ghes); + +out: + ghes_clear_estatus(ghes); + return 0; +} + +static int ghes_notify_sci(struct notifier_block *this, + unsigned long event, void *data) +{ + struct ghes *ghes; + int ret = NOTIFY_DONE; + + rcu_read_lock(); + list_for_each_entry_rcu(ghes, &ghes_sci, list) { + if (!ghes_proc(ghes)) + ret = NOTIFY_OK; + } + rcu_read_unlock(); + + return ret; +} + +static struct notifier_block ghes_notifier_sci = { + .notifier_call = ghes_notify_sci, +}; + +static int hest_ghes_parse(struct acpi_hest_header *hest_hdr, void *data) +{ + struct acpi_hest_generic *generic; + struct ghes *ghes = NULL; + int rc = 0; + + if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR) + return 0; + + generic = (struct acpi_hest_generic *)hest_hdr; + if (!generic->enabled) + return 0; + + if (generic->error_block_length < + sizeof(struct acpi_hest_generic_status)) { + pr_warning(FW_BUG GHES_PFX +"Invalid error block length: %u for generic hardware error source: %d\n", + generic->error_block_length, + generic->header.source_id); + goto err; + } + if (generic->records_to_preallocate == 0) { + pr_warning(FW_BUG GHES_PFX +"Invalid records to preallocate: %u for generic hardware error source: %d\n", + generic->records_to_preallocate, + generic->header.source_id); + goto err; + } + ghes = ghes_new(generic); + if (IS_ERR(ghes)) { + rc = PTR_ERR(ghes); + ghes = NULL; + goto err; + } + switch (generic->notify.type) { + case ACPI_HEST_NOTIFY_POLLED: + pr_warning(GHES_PFX +"Generic hardware error source: %d notified via POLL is not supported!\n", + generic->header.source_id); + break; + case ACPI_HEST_NOTIFY_EXTERNAL: + case ACPI_HEST_NOTIFY_LOCAL: + pr_warning(GHES_PFX +"Generic hardware error source: %d notified via IRQ is not supported!\n", + generic->header.source_id); + break; + case ACPI_HEST_NOTIFY_SCI: + if (list_empty(&ghes_sci)) + register_acpi_hed_notifier(&ghes_notifier_sci); + list_add_rcu(&ghes->list, &ghes_sci); + break; + case ACPI_HEST_NOTIFY_NMI: + pr_warning(GHES_PFX +"Generic hardware error source: %d notified via NMI is not supported!\n", + generic->header.source_id); + break; + default: + pr_warning(FW_WARN GHES_PFX + "Unknown notification type: %u for generic hardware error source: %d\n", + generic->notify.type, generic->header.source_id); + break; + } + + return 0; +err: + if (ghes) + ghes_fini(ghes); + return rc; +} + +static void ghes_cleanup(void) +{ + struct ghes *ghes, *nghes; + + if (!list_empty(&ghes_sci)) + unregister_acpi_hed_notifier(&ghes_notifier_sci); + + synchronize_rcu(); + + list_for_each_entry_safe(ghes, nghes, &ghes_sci, list) { + list_del(&ghes->list); + ghes_fini(ghes); + kfree(ghes); + } +} + +static int __init ghes_init(void) +{ + int rc; + + if (acpi_disabled) + return -ENODEV; + + if (hest_disable) { + pr_info(GHES_PFX "HEST is not enabled!\n"); + return -EINVAL; + } + + rc = apei_hest_parse(hest_ghes_parse, NULL); + if (rc) { + pr_err(GHES_PFX + "Error during parsing HEST generic hardware error sources.\n"); + goto err_cleanup; + } + + if (list_empty(&ghes_sci)) { + pr_info(GHES_PFX + "No functional generic hardware error sources.\n"); + rc = -ENODEV; + goto err_cleanup; + } + + pr_info(GHES_PFX + "Generic Hardware Error Source support is initialized.\n"); + + return 0; +err_cleanup: + ghes_cleanup(); + return rc; +} + +static void __exit ghes_exit(void) +{ + ghes_cleanup(); +} + +module_init(ghes_init); +module_exit(ghes_exit); + +MODULE_AUTHOR("Huang Ying"); +MODULE_DESCRIPTION("APEI Generic Hardware Error Source support"); +MODULE_LICENSE("GPL"); |