diff options
Diffstat (limited to 'drivers/acpi/nfit')
| -rw-r--r-- | drivers/acpi/nfit/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/nfit/core.c | 26 | ||||
| -rw-r--r-- | drivers/acpi/nfit/mce.c | 89 | ||||
| -rw-r--r-- | drivers/acpi/nfit/nfit.h | 20 |
4 files changed, 132 insertions, 4 deletions
diff --git a/drivers/acpi/nfit/Makefile b/drivers/acpi/nfit/Makefile index eb95c5aff83b..a407e769f103 100644 --- a/drivers/acpi/nfit/Makefile +++ b/drivers/acpi/nfit/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_ACPI_NFIT) := nfit.o nfit-y := core.o +nfit-$(CONFIG_X86_MCE) += mce.o diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 19d0dfdf9633..69b35b7f97a1 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -51,6 +51,9 @@ module_param(disable_vendor_specific, bool, S_IRUGO); MODULE_PARM_DESC(disable_vendor_specific, "Limit commands to the publicly specified set\n"); +LIST_HEAD(acpi_descs); +DEFINE_MUTEX(acpi_desc_lock); + static struct workqueue_struct *nfit_wq; struct nfit_table_prev { @@ -361,7 +364,7 @@ static const char *spa_type_name(u16 type) return to_name[type]; } -static int nfit_spa_type(struct acpi_nfit_system_address *spa) +int nfit_spa_type(struct acpi_nfit_system_address *spa) { int i; @@ -898,8 +901,6 @@ static ssize_t scrub_show(struct device *dev, return rc; } -static int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc); - static ssize_t scrub_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { @@ -2400,6 +2401,11 @@ static void acpi_nfit_destruct(void *data) struct acpi_nfit_desc *acpi_desc = data; struct device *bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus); + /* + * Destruct under acpi_desc_lock so that nfit_handle_mce does not + * race teardown + */ + mutex_lock(&acpi_desc_lock); acpi_desc->cancel = 1; /* * Bounce the nvdimm bus lock to make sure any in-flight @@ -2414,6 +2420,8 @@ static void acpi_nfit_destruct(void *data) sysfs_put(acpi_desc->scrub_count_state); nvdimm_bus_unregister(acpi_desc->nvdimm_bus); acpi_desc->nvdimm_bus = NULL; + list_del(&acpi_desc->list); + mutex_unlock(&acpi_desc_lock); } int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz) @@ -2439,6 +2447,11 @@ int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz) rc = acpi_nfit_desc_init_scrub_attr(acpi_desc); if (rc) return rc; + + /* register this acpi_desc for mce notifications */ + mutex_lock(&acpi_desc_lock); + list_add_tail(&acpi_desc->list, &acpi_descs); + mutex_unlock(&acpi_desc_lock); } mutex_lock(&acpi_desc->init_mutex); @@ -2549,7 +2562,7 @@ static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc, return 0; } -static int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc) +int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc) { struct device *dev = acpi_desc->dev; struct nfit_spa *nfit_spa; @@ -2598,6 +2611,7 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) INIT_LIST_HEAD(&acpi_desc->flushes); INIT_LIST_HEAD(&acpi_desc->memdevs); INIT_LIST_HEAD(&acpi_desc->dimms); + INIT_LIST_HEAD(&acpi_desc->list); mutex_init(&acpi_desc->init_mutex); INIT_WORK(&acpi_desc->work, acpi_nfit_scrub); } @@ -2750,13 +2764,17 @@ static __init int nfit_init(void) if (!nfit_wq) return -ENOMEM; + nfit_mce_register(); + return acpi_bus_register_driver(&acpi_nfit_driver); } static __exit void nfit_exit(void) { + nfit_mce_unregister(); acpi_bus_unregister_driver(&acpi_nfit_driver); destroy_workqueue(nfit_wq); + WARN_ON(!list_empty(&acpi_descs)); } module_init(nfit_init); diff --git a/drivers/acpi/nfit/mce.c b/drivers/acpi/nfit/mce.c new file mode 100644 index 000000000000..4c745bf389fe --- /dev/null +++ b/drivers/acpi/nfit/mce.c @@ -0,0 +1,89 @@ +/* + * NFIT - Machine Check Handler + * + * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License 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 <linux/notifier.h> +#include <linux/acpi.h> +#include <asm/mce.h> +#include "nfit.h" + +static int nfit_handle_mce(struct notifier_block *nb, unsigned long val, + void *data) +{ + struct mce *mce = (struct mce *)data; + struct acpi_nfit_desc *acpi_desc; + struct nfit_spa *nfit_spa; + + /* We only care about memory errors */ + if (!(mce->status & MCACOD)) + return NOTIFY_DONE; + + /* + * mce->addr contains the physical addr accessed that caused the + * machine check. We need to walk through the list of NFITs, and see + * if any of them matches that address, and only then start a scrub. + */ + mutex_lock(&acpi_desc_lock); + list_for_each_entry(acpi_desc, &acpi_descs, list) { + struct device *dev = acpi_desc->dev; + int found_match = 0; + + mutex_lock(&acpi_desc->init_mutex); + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { + struct acpi_nfit_system_address *spa = nfit_spa->spa; + + if (nfit_spa_type(spa) == NFIT_SPA_PM) + continue; + /* find the spa that covers the mce addr */ + if (spa->address > mce->addr) + continue; + if ((spa->address + spa->length - 1) < mce->addr) + continue; + found_match = 1; + dev_dbg(dev, "%s: addr in SPA %d (0x%llx, 0x%llx)\n", + __func__, spa->range_index, spa->address, + spa->length); + /* + * We can break at the first match because we're going + * to rescan all the SPA ranges. There shouldn't be any + * aliasing anyway. + */ + break; + } + mutex_unlock(&acpi_desc->init_mutex); + + /* + * We can ignore an -EBUSY here because if an ARS is already + * in progress, just let that be the last authoritative one + */ + if (found_match) + acpi_nfit_ars_rescan(acpi_desc); + } + + mutex_unlock(&acpi_desc_lock); + return NOTIFY_DONE; +} + +static struct notifier_block nfit_mce_dec = { + .notifier_call = nfit_handle_mce, +}; + +void nfit_mce_register(void) +{ + mce_register_decode_chain(&nfit_mce_dec); +} + +void nfit_mce_unregister(void) +{ + mce_unregister_decode_chain(&nfit_mce_dec); +} diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index 6ecf337c97aa..ba6074a06958 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -16,6 +16,7 @@ #define __NFIT_H__ #include <linux/workqueue.h> #include <linux/libnvdimm.h> +#include <linux/ndctl.h> #include <linux/types.h> #include <linux/uuid.h> #include <linux/acpi.h> @@ -148,6 +149,7 @@ struct acpi_nfit_desc { struct nd_cmd_ars_status *ars_status; size_t ars_status_size; struct work_struct work; + struct list_head list; struct kernfs_node *scrub_count_state; unsigned int scrub_count; unsigned int cancel:1; @@ -187,6 +189,24 @@ struct nfit_blk { u32 dimm_flags; }; +extern struct list_head acpi_descs; +extern struct mutex acpi_desc_lock; +int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc); + +#ifdef CONFIG_X86_MCE +void nfit_mce_register(void); +void nfit_mce_unregister(void); +#else +static inline void nfit_mce_register(void) +{ +} +static inline void nfit_mce_unregister(void) +{ +} +#endif + +int nfit_spa_type(struct acpi_nfit_system_address *spa); + static inline struct acpi_nfit_memory_map *__to_nfit_memdev( struct nfit_mem *nfit_mem) { |