libnvdimm: Move nd_device_attribute_group to device_type

A 'struct device_type' instance can carry default attributes for the
device. Use this facility to remove the export of
nd_device_attribute_group and put the responsibility on the core rather
than leaf implementations to define this attribute.

For regions this creates a new nd_region_attribute_groups[] added to the
per-region device-type instances.

Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Oliver O'Halloran" <oohall@gmail.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/157309901138.1582359.12909354140826530394.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

6 files changed, 22 insertions, 10 deletions

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index d47412dcdf38..eb422527dd57 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -669,10 +669,9 @@ static struct attribute *nd_device_attributes[] = {
 /*
  * nd_device_attribute_group - generic attributes for all devices on an nd bus
  */
-struct attribute_group nd_device_attribute_group = {
+const struct attribute_group nd_device_attribute_group = {
 	.attrs = nd_device_attributes,
 };
-EXPORT_SYMBOL_GPL(nd_device_attribute_group);
 
 static ssize_t numa_node_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 196aa44c4936..278867c68682 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -202,9 +202,15 @@ static void nvdimm_release(struct device *dev)
 	kfree(nvdimm);
 }
 
-static struct device_type nvdimm_device_type = {
+static const struct attribute_group *nvdimm_attribute_groups[] = {
+	&nd_device_attribute_group,
+	NULL,
+};
+
+static const struct device_type nvdimm_device_type = {
 	.name = "nvdimm",
 	.release = nvdimm_release,
+	.groups = nvdimm_attribute_groups,
 };
 
 bool is_nvdimm(struct device *dev)
diff --git a/drivers/nvdimm/e820.c b/drivers/nvdimm/e820.c
index 87f72f725e4f..adde2864c6a4 100644
--- a/drivers/nvdimm/e820.c
+++ b/drivers/nvdimm/e820.c
@@ -15,7 +15,6 @@ static const struct attribute_group *e820_pmem_attribute_groups[] = {
 
 static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
 	&nd_region_attribute_group,
-	&nd_device_attribute_group,
 	NULL,
 };
 
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index d83dd34cd169..21e018bfa188 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -239,6 +239,7 @@ int __init nd_label_init(void);
 void nvdimm_exit(void);
 void nd_region_exit(void);
 struct nvdimm;
+extern const struct attribute_group nd_device_attribute_group;
 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 int nvdimm_check_config_data(struct device *dev);
 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
index 97187d6c0bdb..41348fa6b74c 100644
--- a/drivers/nvdimm/of_pmem.c
+++ b/drivers/nvdimm/of_pmem.c
@@ -11,7 +11,6 @@
 
 static const struct attribute_group *region_attr_groups[] = {
 	&nd_region_attribute_group,
-	&nd_device_attribute_group,
 	NULL,
 };
 
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index e89f2eb3678c..710b5111eaa8 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -763,19 +763,27 @@ struct attribute_group nd_region_attribute_group = {
 };
 EXPORT_SYMBOL_GPL(nd_region_attribute_group);
 
-static struct device_type nd_blk_device_type = {
+static const struct attribute_group *nd_region_attribute_groups[] = {
+	&nd_device_attribute_group,
+	NULL,
+};
+
+static const struct device_type nd_blk_device_type = {
 	.name = "nd_blk",
 	.release = nd_region_release,
+	.groups = nd_region_attribute_groups,
 };
 
-static struct device_type nd_pmem_device_type = {
+static const struct device_type nd_pmem_device_type = {
 	.name = "nd_pmem",
 	.release = nd_region_release,
+	.groups = nd_region_attribute_groups,
 };
 
-static struct device_type nd_volatile_device_type = {
+static const struct device_type nd_volatile_device_type = {
 	.name = "nd_volatile",
 	.release = nd_region_release,
+	.groups = nd_region_attribute_groups,
 };
 
 bool is_nd_pmem(struct device *dev)
@@ -931,8 +939,8 @@ void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
 EXPORT_SYMBOL(nd_region_release_lane);
 
 static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
-		struct nd_region_desc *ndr_desc, struct device_type *dev_type,
-		const char *caller)
+		struct nd_region_desc *ndr_desc,
+		const struct device_type *dev_type, const char *caller)
 {
 	struct nd_region *nd_region;
 	struct device *dev;