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-rw-r--r--drivers/acpi/nfit/Makefile1
-rw-r--r--drivers/acpi/nfit/core.c26
-rw-r--r--drivers/acpi/nfit/mce.c89
-rw-r--r--drivers/acpi/nfit/nfit.h20
-rw-r--r--tools/testing/nvdimm/Kbuild1
5 files changed, 133 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)
{
diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild
index 0dca8ff7557b..ad6dd0543019 100644
--- a/tools/testing/nvdimm/Kbuild
+++ b/tools/testing/nvdimm/Kbuild
@@ -30,6 +30,7 @@ obj-$(CONFIG_DEV_DAX) += dax.o
obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem.o
nfit-y := $(ACPI_SRC)/core.o
+nfit-$(CONFIG_X86_MCE) += $(ACPI_SRC)/mce.o
nfit-y += config_check.o
nd_pmem-y := $(NVDIMM_SRC)/pmem.o
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