libnvdimm, label: populate the type_guid property for v1.2 namespaces

The type_guid refers to the "Address Range Type GUID" for the region
backing a namespace as defined the ACPI NFIT (NVDIMM Firmware Interface
Table). This 'type' identifier specifies an access mechanism for the
given namespace. This capability replaces the confusing usage of the
'NSLABEL_FLAG_LOCAL' flag to indicate a block-aperture-mode namespace.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/acpi/nfit/core.c

@@ -1743,15 +1743,17 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 	struct nfit_set_info2 *info2;
 	struct nfit_set_info *info;
 
+	nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
+	if (!nd_set)
+		return -ENOMEM;
+	ndr_desc->nd_set = nd_set;
+	guid_copy(&nd_set->type_guid, (guid_t *) spa->range_guid);
+
 	if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
 		/* pass */;
 	else
 		return 0;
 
-	nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
-	if (!nd_set)
-		return -ENOMEM;
-
 	info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
@@ -2228,7 +2230,7 @@ static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
 	struct acpi_nfit_system_address *spa = nfit_spa->spa;
 	struct nd_blk_region_desc *ndbr_desc;
 	struct nfit_mem *nfit_mem;
-	int blk_valid = 0;
+	int blk_valid = 0, rc;
 
 	if (!nvdimm) {
 		dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n",
@@ -2260,6 +2262,9 @@ static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
 		ndbr_desc = to_blk_region_desc(ndr_desc);
 		ndbr_desc->enable = acpi_nfit_blk_region_enable;
 		ndbr_desc->do_io = acpi_desc->blk_do_io;
+		rc = acpi_nfit_init_interleave_set(acpi_desc, ndr_desc, spa);
+		if (rc)
+			return rc;
 		nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
 				ndr_desc);
 		if (!nfit_spa->nd_region)

drivers/nvdimm/label.c

@@ -553,6 +553,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
 		struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
 		int pos)
 {
+	struct nd_interleave_set *nd_set = nd_region->nd_set;
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 	struct nd_label_ent *label_ent, *victim = NULL;
 	struct nd_namespace_label *nd_label;
@@ -597,6 +598,8 @@ static int __pmem_label_update(struct nd_region *nd_region,
 	nd_label->rawsize = __cpu_to_le64(resource_size(res));
 	nd_label->dpa = __cpu_to_le64(res->start);
 	nd_label->slot = __cpu_to_le32(slot);
+	if (namespace_label_has(ndd, type_guid))
+		guid_copy(&nd_label->type_guid, &nd_set->type_guid);
 	nd_dbg_dpa(nd_region, ndd, res, "%s\n", __func__);
 
 	/* update label */
@@ -684,6 +687,7 @@ static int __blk_label_update(struct nd_region *nd_region,
 		int num_labels)
 {
 	int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
+	struct nd_interleave_set *nd_set = nd_region->nd_set;
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 	struct nd_namespace_label *nd_label;
 	struct nd_label_ent *label_ent, *e;
@@ -788,6 +792,8 @@ static int __blk_label_update(struct nd_region *nd_region,
 		nd_label->rawsize = __cpu_to_le64(resource_size(res));
 		nd_label->lbasize = __cpu_to_le64(nsblk->lbasize);
 		nd_label->slot = __cpu_to_le32(slot);
+		if (namespace_label_has(ndd, type_guid))
+			guid_copy(&nd_label->type_guid, &nd_set->type_guid);
 
 		/* update label */
 		offset = nd_label_offset(ndd, nd_label);

drivers/nvdimm/namespace_devs.c

@@ -1639,6 +1639,8 @@ static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
 
 	for (i = 0; i < nd_region->ndr_mappings; i++) {
 		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+		struct nd_interleave_set *nd_set = nd_region->nd_set;
+		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 		struct nd_label_ent *label_ent;
 		bool found_uuid = false;
 
@@ -1659,8 +1661,17 @@ static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
 			if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
 				continue;
 
+			if (namespace_label_has(ndd, type_guid)
+					&& !guid_equal(&nd_set->type_guid,
+						&nd_label->type_guid)) {
+				dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
+						nd_set->type_guid.b,
+						nd_label->type_guid.b);
+				continue;
+			}
+
 			if (found_uuid) {
-				dev_dbg(to_ndd(nd_mapping)->dev,
+				dev_dbg(ndd->dev,
 						"%s duplicate entry for uuid\n",
 						__func__);
 				return false;
@@ -2047,12 +2058,21 @@ struct device *create_namespace_blk(struct nd_region *nd_region,
 {
 
 	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+	struct nd_interleave_set *nd_set = nd_region->nd_set;
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 	struct nd_namespace_blk *nsblk;
 	char name[NSLABEL_NAME_LEN];
 	struct device *dev = NULL;
 	struct resource *res;
 
+	if (namespace_label_has(ndd, type_guid)
+			&& !guid_equal(&nd_set->type_guid,
+				&nd_label->type_guid)) {
+		dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
+				nd_set->type_guid.b, nd_label->type_guid.b);
+		return ERR_PTR(-EAGAIN);
+	}
+
 	nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
 	if (!nsblk)
 		return ERR_PTR(-ENOMEM);
@@ -2144,17 +2164,16 @@ static struct device **scan_labels(struct nd_region *nd_region)
 		kfree(devs);
 		devs = __devs;
 
-		if (is_nd_blk(&nd_region->dev)) {
+		if (is_nd_blk(&nd_region->dev))
 			dev = create_namespace_blk(nd_region, nd_label, count);
-			if (IS_ERR(dev))
-				goto err;
-			devs[count++] = dev;
-		} else {
+		else {
 			struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 			struct nd_namespace_index *nsindex;
 
 			nsindex = to_namespace_index(ndd, ndd->ns_current);
 			dev = create_namespace_pmem(nd_region, nsindex, nd_label);
+		}
+
 		if (IS_ERR(dev)) {
 			switch (PTR_ERR(dev)) {
 			case -EAGAIN:
@@ -2168,7 +2187,7 @@ static struct device **scan_labels(struct nd_region *nd_region)
 			}
 		} else
 			devs[count++] = dev;
-		}
+
 	}
 
 	dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",

include/linux/libnvdimm.h

@@ -17,6 +17,7 @@
 #include <linux/kernel.h>
 #include <linux/sizes.h>
 #include <linux/types.h>
+#include <linux/uuid.h>
 
 enum {
 	/* when a dimm supports both PMEM and BLK access a label is required */
@@ -77,6 +78,8 @@ struct nd_interleave_set {
 	u64 cookie2;
 	/* compatibility with initial buggy Linux implementation */
 	u64 altcookie;
+
+	guid_t type_guid;
 };
 
 struct nd_mapping_desc {