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libnvdimm: Add 'resource' sysfs attribute to regions

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Adding sysfs attribute in order to export the physical address of the
region. This is for supporting of user app poison clear via
ND_IOCTL_CLEAR_ERROR.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2017-04-07 15:33:25 -07:00 committed by Dan Williams
parent 6a6bef9042
commit 802f4be6fe
1 changed files with 13 additions and 0 deletions
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13
drivers/nvdimm/region_devs.c
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@ -463,6 +463,15 @@ static struct device_attribute dev_attr_nd_badblocks = {
.show = nd_badblocks_show,
};
static ssize_t resource_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nd_region *nd_region = to_nd_region(dev);
return sprintf(buf, "%#llx\n", nd_region->ndr_start);
}
static DEVICE_ATTR_RO(resource);
static struct attribute *nd_region_attributes[] = {
&dev_attr_size.attr,
&dev_attr_nstype.attr,
@ -476,6 +485,7 @@ static struct attribute *nd_region_attributes[] = {
&dev_attr_namespace_seed.attr,
&dev_attr_init_namespaces.attr,
&dev_attr_nd_badblocks.attr,
&dev_attr_resource.attr,
NULL,
};
@ -495,6 +505,9 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
if (!is_nd_pmem(dev) && a == &dev_attr_nd_badblocks.attr)
return 0;
if (!is_nd_pmem(dev) && a == &dev_attr_resource.attr)
return 0;
if (a != &dev_attr_set_cookie.attr
&& a != &dev_attr_available_size.attr)
return a->mode;