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authorVishal Verma <vishal.l.verma@intel.com>2016-07-24 07:51:42 +0300
committerDan Williams <dan.j.williams@intel.com>2016-07-24 07:51:42 +0300
commit37b137ff8c833385b75ff2baf4bace25e52247d2 (patch)
tree7bf79dcc785820ed90a02874c4c9119e528da3c4 /drivers/acpi
parent18515942d61bdfd4b31ea13f9fbb9c18650c6818 (diff)
downloadlinux-37b137ff8c833385b75ff2baf4bace25e52247d2.tar.xz
nfit, libnvdimm: allow an ARS scrub to be triggered on demand
Normally, an ARS (Address Range Scrub) only happens at boot/initialization time. There can however arise situations where a bus-wide rescan is needed - notably, in the case of discovering a latent media error, we should do a full rescan to figure out what other sectors are bad, and thus potentially avoid triggering an mce on them in the future. Also provide a sysfs trigger to start a bus-wide scrub. Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/nfit.c161
-rw-r--r--drivers/acpi/nfit.h4
2 files changed, 157 insertions, 8 deletions
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index be7c2fde16e7..19d0dfdf9633 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
+#include <linux/sysfs.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/acpi.h>
@@ -874,14 +875,87 @@ static ssize_t revision_show(struct device *dev,
}
static DEVICE_ATTR_RO(revision);
+/*
+ * This shows the number of full Address Range Scrubs that have been
+ * completed since driver load time. Userspace can wait on this using
+ * select/poll etc. A '+' at the end indicates an ARS is in progress
+ */
+static ssize_t scrub_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ ssize_t rc = -ENXIO;
+
+ device_lock(dev);
+ nd_desc = dev_get_drvdata(dev);
+ if (nd_desc) {
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+
+ rc = sprintf(buf, "%d%s", acpi_desc->scrub_count,
+ (work_busy(&acpi_desc->work)) ? "+\n" : "\n");
+ }
+ device_unlock(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)
+{
+ struct nvdimm_bus_descriptor *nd_desc;
+ ssize_t rc;
+ long val;
+
+ rc = kstrtol(buf, 0, &val);
+ if (rc)
+ return rc;
+ if (val != 1)
+ return -EINVAL;
+
+ device_lock(dev);
+ nd_desc = dev_get_drvdata(dev);
+ if (nd_desc) {
+ struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+
+ rc = acpi_nfit_ars_rescan(acpi_desc);
+ }
+ device_unlock(dev);
+ if (rc)
+ return rc;
+ return size;
+}
+static DEVICE_ATTR_RW(scrub);
+
+static bool ars_supported(struct nvdimm_bus *nvdimm_bus)
+{
+ struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
+ const unsigned long mask = 1 << ND_CMD_ARS_CAP | 1 << ND_CMD_ARS_START
+ | 1 << ND_CMD_ARS_STATUS;
+
+ return (nd_desc->cmd_mask & mask) == mask;
+}
+
+static umode_t nfit_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+
+ if (a == &dev_attr_scrub.attr && !ars_supported(nvdimm_bus))
+ return 0;
+ return a->mode;
+}
+
static struct attribute *acpi_nfit_attributes[] = {
&dev_attr_revision.attr,
+ &dev_attr_scrub.attr,
NULL,
};
static struct attribute_group acpi_nfit_attribute_group = {
.name = "nfit",
.attrs = acpi_nfit_attributes,
+ .is_visible = nfit_visible,
};
static const struct attribute_group *acpi_nfit_attribute_groups[] = {
@@ -2054,7 +2128,7 @@ static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc,
unsigned int tmo = scrub_timeout;
int rc;
- if (nfit_spa->ars_done || !nfit_spa->nd_region)
+ if (!nfit_spa->ars_required || !nfit_spa->nd_region)
return;
rc = ars_start(acpi_desc, nfit_spa);
@@ -2143,7 +2217,9 @@ static void acpi_nfit_scrub(struct work_struct *work)
* firmware initiated scrubs to complete and then we go search for the
* affected spa regions to mark them scanned. In the second phase we
* initiate a directed scrub for every range that was not scrubbed in
- * phase 1.
+ * phase 1. If we're called for a 'rescan', we harmlessly pass through
+ * the first phase, but really only care about running phase 2, where
+ * regions can be notified of new poison.
*/
/* process platform firmware initiated scrubs */
@@ -2246,14 +2322,17 @@ static void acpi_nfit_scrub(struct work_struct *work)
* Flag all the ranges that still need scrubbing, but
* register them now to make data available.
*/
- if (nfit_spa->nd_region)
- nfit_spa->ars_done = 1;
- else
+ if (!nfit_spa->nd_region) {
+ nfit_spa->ars_required = 1;
acpi_nfit_register_region(acpi_desc, nfit_spa);
+ }
}
list_for_each_entry(nfit_spa, &acpi_desc->spas, list)
acpi_nfit_async_scrub(acpi_desc, nfit_spa);
+ acpi_desc->scrub_count++;
+ if (acpi_desc->scrub_count_state)
+ sysfs_notify_dirent(acpi_desc->scrub_count_state);
mutex_unlock(&acpi_desc->init_mutex);
}
@@ -2291,12 +2370,48 @@ static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,
return 0;
}
+static int acpi_nfit_desc_init_scrub_attr(struct acpi_nfit_desc *acpi_desc)
+{
+ struct device *dev = acpi_desc->dev;
+ struct kernfs_node *nfit;
+ struct device *bus_dev;
+
+ if (!ars_supported(acpi_desc->nvdimm_bus))
+ return 0;
+
+ bus_dev = to_nvdimm_bus_dev(acpi_desc->nvdimm_bus);
+ nfit = sysfs_get_dirent(bus_dev->kobj.sd, "nfit");
+ if (!nfit) {
+ dev_err(dev, "sysfs_get_dirent 'nfit' failed\n");
+ return -ENODEV;
+ }
+ acpi_desc->scrub_count_state = sysfs_get_dirent(nfit, "scrub");
+ sysfs_put(nfit);
+ if (!acpi_desc->scrub_count_state) {
+ dev_err(dev, "sysfs_get_dirent 'scrub' failed\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
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);
acpi_desc->cancel = 1;
+ /*
+ * Bounce the nvdimm bus lock to make sure any in-flight
+ * acpi_nfit_ars_rescan() submissions have had a chance to
+ * either submit or see ->cancel set.
+ */
+ device_lock(bus_dev);
+ device_unlock(bus_dev);
+
flush_workqueue(nfit_wq);
+ if (acpi_desc->scrub_count_state)
+ sysfs_put(acpi_desc->scrub_count_state);
nvdimm_bus_unregister(acpi_desc->nvdimm_bus);
acpi_desc->nvdimm_bus = NULL;
}
@@ -2309,14 +2424,21 @@ int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz)
int rc;
if (!acpi_desc->nvdimm_bus) {
+ acpi_nfit_init_dsms(acpi_desc);
+
acpi_desc->nvdimm_bus = nvdimm_bus_register(dev,
&acpi_desc->nd_desc);
if (!acpi_desc->nvdimm_bus)
return -ENOMEM;
+
rc = devm_add_action_or_reset(dev, acpi_nfit_destruct,
acpi_desc);
if (rc)
return rc;
+
+ rc = acpi_nfit_desc_init_scrub_attr(acpi_desc);
+ if (rc)
+ return rc;
}
mutex_lock(&acpi_desc->init_mutex);
@@ -2360,8 +2482,6 @@ int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *data, acpi_size sz)
if (rc)
goto out_unlock;
- acpi_nfit_init_dsms(acpi_desc);
-
rc = acpi_nfit_register_dimms(acpi_desc);
if (rc)
goto out_unlock;
@@ -2429,6 +2549,33 @@ 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)
+{
+ struct device *dev = acpi_desc->dev;
+ struct nfit_spa *nfit_spa;
+
+ if (work_busy(&acpi_desc->work))
+ return -EBUSY;
+
+ if (acpi_desc->cancel)
+ return 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;
+
+ nfit_spa->ars_required = 1;
+ }
+ queue_work(nfit_wq, &acpi_desc->work);
+ dev_dbg(dev, "%s: ars_scan triggered\n", __func__);
+ mutex_unlock(&acpi_desc->init_mutex);
+
+ return 0;
+}
+
void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
{
struct nvdimm_bus_descriptor *nd_desc;
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index b63a583a678f..6ecf337c97aa 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -80,7 +80,7 @@ enum {
struct nfit_spa {
struct list_head list;
struct nd_region *nd_region;
- unsigned int ars_done:1;
+ unsigned int ars_required:1;
u32 clear_err_unit;
u32 max_ars;
struct acpi_nfit_system_address spa[0];
@@ -148,6 +148,8 @@ struct acpi_nfit_desc {
struct nd_cmd_ars_status *ars_status;
size_t ars_status_size;
struct work_struct work;
+ struct kernfs_node *scrub_count_state;
+ unsigned int scrub_count;
unsigned int cancel:1;
unsigned long dimm_cmd_force_en;
unsigned long bus_cmd_force_en;