[PATCH v2 07/18] libnvdimm: Move nvdimm_attribute_group to device_type

[Dan Williams <dan.j.williams@xxxxxxxxx>]

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

Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: "Oliver O'Halloran" <oohall@xxxxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/157309903201.1582359.10966209746585062329.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
---
 arch/powerpc/platforms/pseries/papr_scm.c |    9 ++-----
 drivers/acpi/nfit/core.c                  |    1 -
 drivers/nvdimm/dimm_devs.c                |   36 +++++++++++++++--------------
 include/linux/libnvdimm.h                 |    1 -
 4 files changed, 20 insertions(+), 27 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 0405fb769336..8354737ac340 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -289,11 +289,6 @@ static const struct attribute_group *bus_attr_groups[] = {
 	NULL,
 };
 
-static const struct attribute_group *papr_scm_dimm_groups[] = {
-	&nvdimm_attribute_group,
-	NULL,
-};
-
 static inline int papr_scm_node(int node)
 {
 	int min_dist = INT_MAX, dist;
@@ -339,8 +334,8 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
 	dimm_flags = 0;
 	set_bit(NDD_ALIASING, &dimm_flags);
 
-	p->nvdimm = nvdimm_create(p->bus, p, papr_scm_dimm_groups,
-				dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
+	p->nvdimm = nvdimm_create(p->bus, p, NULL, dimm_flags,
+				  PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
 	if (!p->nvdimm) {
 		dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn);
 		goto err;
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 69c406ecc3a6..84fc1f865802 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1698,7 +1698,6 @@ static const struct attribute_group acpi_nfit_dimm_attribute_group = {
 };
 
 static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {
-	&nvdimm_attribute_group,
 	&acpi_nfit_dimm_attribute_group,
 	NULL,
 };
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 278867c68682..94ea6dba6b4f 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -202,22 +202,6 @@ static void nvdimm_release(struct device *dev)
 	kfree(nvdimm);
 }
 
-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)
-{
-	return dev->type == &nvdimm_device_type;
-}
-
 struct nvdimm *to_nvdimm(struct device *dev)
 {
 	struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
@@ -456,11 +440,27 @@ static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
 	return 0;
 }
 
-struct attribute_group nvdimm_attribute_group = {
+static const struct attribute_group nvdimm_attribute_group = {
 	.attrs = nvdimm_attributes,
 	.is_visible = nvdimm_visible,
 };
-EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
+
+static const struct attribute_group *nvdimm_attribute_groups[] = {
+	&nd_device_attribute_group,
+	&nvdimm_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)
+{
+	return dev->type == &nvdimm_device_type;
+}
 
 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
 		void *provider_data, const struct attribute_group **groups,
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index eb597d1cb891..3644af97bcb4 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -66,7 +66,6 @@ enum {
 };
 
 extern struct attribute_group nvdimm_bus_attribute_group;
-extern struct attribute_group nvdimm_attribute_group;
 
 struct nvdimm;
 struct nvdimm_bus_descriptor;