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libnvdimm: expose platform persistence attribute for nd_region

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Providing a sysfs attribute for nd_region that shows the persistence
capabilities for the platform.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
This commit is contained in:
Dave Jiang 2018-01-31 12:45:49 -07:00 committed by Ross Zwisler
parent 30e6d7bf29
commit 96c3a23905
1 changed files with 13 additions and 0 deletions
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13
drivers/nvdimm/region_devs.c
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@ -528,6 +528,18 @@ static ssize_t resource_show(struct device *dev,
}
static DEVICE_ATTR_RO(resource);
static ssize_t persistence_domain_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nd_region *nd_region = to_nd_region(dev);
unsigned long flags = nd_region->flags;
return sprintf(buf, "%s%s\n",
flags & BIT(ND_REGION_PERSIST_CACHE) ? "cpu_cache " : "",
flags & BIT(ND_REGION_PERSIST_MEMCTRL) ? "memory_controller " : "");
}
static DEVICE_ATTR_RO(persistence_domain);
static struct attribute *nd_region_attributes[] = {
&dev_attr_size.attr,
&dev_attr_nstype.attr,
@ -543,6 +555,7 @@ static struct attribute *nd_region_attributes[] = {
&dev_attr_init_namespaces.attr,
&dev_attr_badblocks.attr,
&dev_attr_resource.attr,
&dev_attr_persistence_domain.attr,
NULL,
};