[PATCH 2/5] libnvdimm: Add resource sysfs attrib to nd region

From: Dave Jiang <dave.jiang@intel.com>
To: dan.j.williams@intel.com
Cc: linux-nvdimm@lists.01.org
Subject: [PATCH 2/5] libnvdimm: Add resource sysfs attrib to nd region
Date: Mon, 06 Mar 2017 13:32:37 -0700	[thread overview]
Message-ID: <148883235738.49239.6145526243848985663.stgit@djiang5-desk3.ch.intel.com> (raw)
In-Reply-To: <148883211285.49239.17952572594430933942.stgit@djiang5-desk3.ch.intel.com>

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

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/nvdimm/region_devs.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 4d6db84..56f8123 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -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;

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