[PATCH 0/9] libnvdimm, label: namespace specification v1.2 support

[PATCH 0/9] libnvdimm, label: namespace specification v1.2 support

[Dan Williams]

The recently released UEFI 2.7 Specification [1], includes an updated
version (v1.2) of the NVDIMM Namespace Label Specification that was previously
published on pmem.io [2] (v1.1).

In the process of moving to a UEFI standard definition the v1.2 updates
adds several features for improved cross-OS and pre-OS (EFI driver)
compatibility and safety. The major highlights include:

1/ Support for an "address abstraction guid" so that implementations can
   uniquely identify personalities layered on top of a namespace. A
   standard address abstraction definition example is the BTT (Block
   Translation Table for sector atomicity) layout. A private / local
   abstraction definition example is the Linux device-DAX personality.

2/ Checksums for individual label slots

3/ Additional safety and self-consistency properties like an updated
   interleave-set-cookie algorithm and recording the NFIT address-type-guid
   in the namespace.

UEFI mandates that these labels be accessed through new ACPI methods
_LSI, _LSR, and _LSW (Label Storage {Info,Read,Write}), however support
for those is saved for a later patch series once the ACPICA enabling for
ACPI 6.2 lands in an immutable form in the acpi tree.

These updates pass a run through the nvdimm unit tests and an updated
version of the tests targeting the address-abstraction guid. This set is
based on the 'uuid-types' branch of git.infradead.org/users/hch/uuid.git
which includes Christoph's and Andy's revamp of the kernel's uuid + guid
helper routines.

[1]: http://www.uefi.org/sites/default/files/resources/UEFI_Spec_2_7.pdf
[2]: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf

---

Dan Williams (9):
      libnvdimm, label: add v1.2 nvdimm label definitions
      libnvdimm, label: add v1.2 interleave-set-cookie algorithm
      libnvdimm, label: honor the lba size specified in v1.2 labels
      libnvdimm, label: populate the type_guid property for v1.2 namespaces
      libnvdimm, label: populate 'isetcookie' for blk-aperture namespaces
      libnvdimm, label: update 'nlabel' and 'position' handling for local namespaces
      libnvdimm, label: add v1.2 label checksum support
      libnvdimm, label: add address abstraction identifiers
      libnvdimm, label: switch to using v1.2 labels by default


 drivers/acpi/nfit/core.c        |   67 +++++++++--
 drivers/nvdimm/btt_devs.c       |    8 +
 drivers/nvdimm/claim.c          |   28 ++++
 drivers/nvdimm/core.c           |    3 
 drivers/nvdimm/dax_devs.c       |    8 +
 drivers/nvdimm/label.c          |  244 +++++++++++++++++++++++++++++++++++----
 drivers/nvdimm/label.h          |   20 +++
 drivers/nvdimm/namespace_devs.c |  211 +++++++++++++++++++++++++++++-----
 drivers/nvdimm/nd.h             |   13 ++
 drivers/nvdimm/pfn_devs.c       |    8 +
 drivers/nvdimm/pmem.c           |    1 
 drivers/nvdimm/region_devs.c    |   43 ++++++-
 include/linux/libnvdimm.h       |    8 +
 include/linux/nd.h              |   12 ++
 14 files changed, 596 insertions(+), 78 deletions(-)

[PATCH 1/9] libnvdimm, label: add v1.2 nvdimm label definitions

[Dan Williams]

In support of improved interoperability between operating systems and pre-boot
environments the Intel proposed NVDIMM Namespace Specification [1], has been
adopted and modified to the the UEFI 2.7 NVDIMM Label Protocol [2].

Update the definitions of the namespace label data structures so that the new
format can be supported alongside the existing label format.

The new specification changes the default label size to 256 bytes, so
everywhere that relied on sizeof(struct nd_namespace_label) must now use the
sizeof_namespace_label() helper.

There should be no functional differences from these changes as the
default is still the v1.1 128-byte format. Future patches will move the
default to the v1.2 definition.

[1]: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
[2]: http://www.uefi.org/sites/default/files/resources/UEFI_Spec_2_7.pdf

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/label.c |   95 +++++++++++++++++++++++++++++++++++++++---------
 drivers/nvdimm/label.h |   15 +++++++-
 drivers/nvdimm/nd.h    |    8 ++++
 3 files changed, 97 insertions(+), 21 deletions(-)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index dd615345699f..d6233d220bfd 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -34,6 +34,11 @@ static u32 best_seq(u32 a, u32 b)
 		return a;
 }
 
+unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd)
+{
+	return ndd->nslabel_size;
+}
+
 size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
 {
 	u32 index_span;
@@ -49,7 +54,7 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
 	 * starts to waste space at larger config_sizes, but it's
 	 * unlikely we'll ever see anything but 128K.
 	 */
-	index_span = ndd->nsarea.config_size / 129;
+	index_span = ndd->nsarea.config_size / (sizeof_namespace_label(ndd) + 1);
 	index_span /= NSINDEX_ALIGN * 2;
 	ndd->nsindex_size = index_span * NSINDEX_ALIGN;
 
@@ -58,10 +63,10 @@ size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
 
 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
 {
-	return ndd->nsarea.config_size / 129;
+	return ndd->nsarea.config_size / (sizeof_namespace_label(ndd) + 1);
 }
 
-int nd_label_validate(struct nvdimm_drvdata *ndd)
+static int __nd_label_validate(struct nvdimm_drvdata *ndd)
 {
 	/*
 	 * On media label format consists of two index blocks followed
@@ -104,6 +109,7 @@ int nd_label_validate(struct nvdimm_drvdata *ndd)
 		u32 nslot;
 		u8 sig[NSINDEX_SIG_LEN];
 		u64 sum_save, sum, size;
+		unsigned int version, labelsize;
 
 		memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
 		if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
@@ -111,6 +117,21 @@ int nd_label_validate(struct nvdimm_drvdata *ndd)
 					__func__, i);
 			continue;
 		}
+
+		/* label sizes larger than 128 arrived with v1.2 */
+		version = __le16_to_cpu(nsindex[i]->major) * 100
+			+ __le16_to_cpu(nsindex[i]->minor);
+		if (version >= 102)
+			labelsize = 1 << (7 + nsindex[i]->labelsize);
+		else
+			labelsize = 128;
+
+		if (labelsize != sizeof_namespace_label(ndd)) {
+			dev_dbg(dev, "%s: nsindex%d labelsize %d invalid\n",
+					__func__, i, nsindex[i]->labelsize);
+			continue;
+		}
+
 		sum_save = __le64_to_cpu(nsindex[i]->checksum);
 		nsindex[i]->checksum = __cpu_to_le64(0);
 		sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1);
@@ -153,7 +174,7 @@ int nd_label_validate(struct nvdimm_drvdata *ndd)
 		}
 
 		nslot = __le32_to_cpu(nsindex[i]->nslot);
-		if (nslot * sizeof(struct nd_namespace_label)
+		if (nslot * sizeof_namespace_label(ndd)
 				+ 2 * sizeof_namespace_index(ndd)
 				> ndd->nsarea.config_size) {
 			dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n",
@@ -189,6 +210,28 @@ int nd_label_validate(struct nvdimm_drvdata *ndd)
 	return -1;
 }
 
+int nd_label_validate(struct nvdimm_drvdata *ndd)
+{
+	/*
+	 * In order to probe for and validate namespace index blocks we
+	 * need to know the size of the labels, and we can't trust the
+	 * size of the labels until we validate the index blocks.
+	 * Resolve this dependency loop by probing for known label
+	 * sizes.
+	 */
+	int label_size[] = { 256, 128 };
+	int i, rc;
+
+	for (i = 0; i < ARRAY_SIZE(label_size); i++) {
+		ndd->nslabel_size = label_size[i];
+		rc = __nd_label_validate(ndd);
+		if (rc >= 0)
+			return rc;
+	}
+
+	return -1;
+}
+
 void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
 		struct nd_namespace_index *src)
 {
@@ -210,7 +253,22 @@ static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
 static int to_slot(struct nvdimm_drvdata *ndd,
 		struct nd_namespace_label *nd_label)
 {
-	return nd_label - nd_label_base(ndd);
+	unsigned long label, base;
+
+	label = (unsigned long) nd_label;
+	base = (unsigned long) nd_label_base(ndd);
+
+	return (label - base) / sizeof_namespace_label(ndd);
+}
+
+static struct nd_namespace_label *to_label(struct nvdimm_drvdata *ndd, int slot)
+{
+	unsigned long label, base;
+
+	base = (unsigned long) nd_label_base(ndd);
+	label = base + sizeof_namespace_label(ndd) * slot;
+
+	return (struct nd_namespace_label *) label;
 }
 
 #define for_each_clear_bit_le(bit, addr, size) \
@@ -299,7 +357,7 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
 		struct resource *res;
 		u32 flags;
 
-		nd_label = nd_label_base(ndd) + slot;
+		nd_label = to_label(ndd, slot);
 
 		if (!slot_valid(nd_label, slot))
 			continue;
@@ -331,7 +389,7 @@ int nd_label_active_count(struct nvdimm_drvdata *ndd)
 	for_each_clear_bit_le(slot, free, nslot) {
 		struct nd_namespace_label *nd_label;
 
-		nd_label = nd_label_base(ndd) + slot;
+		nd_label = to_label(ndd, slot);
 
 		if (!slot_valid(nd_label, slot)) {
 			u32 label_slot = __le32_to_cpu(nd_label->slot);
@@ -360,12 +418,12 @@ struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
 	for_each_clear_bit_le(slot, free, nslot) {
 		struct nd_namespace_label *nd_label;
 
-		nd_label = nd_label_base(ndd) + slot;
+		nd_label = to_label(ndd, slot);
 		if (!slot_valid(nd_label, slot))
 			continue;
 
 		if (n-- == 0)
-			return nd_label_base(ndd) + slot;
+			return to_label(ndd, slot);
 	}
 
 	return NULL;
@@ -437,7 +495,8 @@ static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
 		nslot = __le32_to_cpu(nsindex->nslot);
 
 	memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
-	nsindex->flags = __cpu_to_le32(0);
+	memset(&nsindex->flags, 0, 3);
+	nsindex->labelsize = sizeof_namespace_label(ndd) >> 8;
 	nsindex->seq = __cpu_to_le32(seq);
 	offset = (unsigned long) nsindex
 		- (unsigned long) to_namespace_index(ndd, 0);
@@ -525,8 +584,8 @@ static int __pmem_label_update(struct nd_region *nd_region,
 		return -ENXIO;
 	dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
 
-	nd_label = nd_label_base(ndd) + slot;
-	memset(nd_label, 0, sizeof(struct nd_namespace_label));
+	nd_label = to_label(ndd, slot);
+	memset(nd_label, 0, sizeof_namespace_label(ndd));
 	memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN);
 	if (nspm->alt_name)
 		memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
@@ -542,7 +601,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
 	/* update label */
 	offset = nd_label_offset(ndd, nd_label);
 	rc = nvdimm_set_config_data(ndd, offset, nd_label,
-			sizeof(struct nd_namespace_label));
+			sizeof_namespace_label(ndd));
 	if (rc < 0)
 		return rc;
 
@@ -668,7 +727,7 @@ static int __blk_label_update(struct nd_region *nd_region,
 
 		/* mark unused labels for garbage collection */
 		for_each_clear_bit_le(slot, free, nslot) {
-			nd_label = nd_label_base(ndd) + slot;
+			nd_label = to_label(ndd, slot);
 			memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
 			if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
 				continue;
@@ -714,8 +773,8 @@ static int __blk_label_update(struct nd_region *nd_region,
 			goto abort;
 		dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot);
 
-		nd_label = nd_label_base(ndd) + slot;
-		memset(nd_label, 0, sizeof(struct nd_namespace_label));
+		nd_label = to_label(ndd, slot);
+		memset(nd_label, 0, sizeof_namespace_label(ndd));
 		memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN);
 		if (nsblk->alt_name)
 			memcpy(nd_label->name, nsblk->alt_name,
@@ -732,7 +791,7 @@ static int __blk_label_update(struct nd_region *nd_region,
 		/* update label */
 		offset = nd_label_offset(ndd, nd_label);
 		rc = nvdimm_set_config_data(ndd, offset, nd_label,
-				sizeof(struct nd_namespace_label));
+				sizeof_namespace_label(ndd));
 		if (rc < 0)
 			goto abort;
 	}
@@ -790,7 +849,7 @@ static int __blk_label_update(struct nd_region *nd_region,
 		goto out;
 	}
 	for_each_clear_bit_le(slot, free, nslot) {
-		nd_label = nd_label_base(ndd) + slot;
+		nd_label = to_label(ndd, slot);
 		memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
 		if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
 			continue;
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index a59ef6eef2a3..f39bfb31f72f 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -15,6 +15,7 @@
 
 #include <linux/ndctl.h>
 #include <linux/sizes.h>
+#include <linux/uuid.h>
 #include <linux/io.h>
 
 enum {
@@ -60,7 +61,8 @@ static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
  */
 struct nd_namespace_index {
 	u8 sig[NSINDEX_SIG_LEN];
-	__le32 flags;
+	u8 flags[3];
+	u8 labelsize;
 	__le32 seq;
 	__le64 myoff;
 	__le64 mysize;
@@ -98,7 +100,16 @@ struct nd_namespace_label {
 	__le64 dpa;
 	__le64 rawsize;
 	__le32 slot;
-	__le32 unused;
+	/*
+	 * Accessing fields past this point should be gated by a
+	 * namespace_label_has() check.
+	 */
+	u8 align;
+	u8 reserved[3];
+	guid_t type_guid;
+	guid_t abstraction_guid;
+	u8 reserved2[88];
+	__le64 checksum;
 };
 
 /**
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 03852d738eec..28d9f4481547 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -42,7 +42,7 @@ struct nd_poison {
 
 struct nvdimm_drvdata {
 	struct device *dev;
-	int nsindex_size;
+	int nsindex_size, nslabel_size;
 	struct nd_cmd_get_config_size nsarea;
 	void *data;
 	int ns_current, ns_next;
@@ -96,6 +96,12 @@ static inline struct nd_namespace_index *to_next_namespace_index(
 	return to_namespace_index(ndd, ndd->ns_next);
 }
 
+unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
+
+#define namespace_label_has(ndd, field) \
+	(offsetof(struct nd_namespace_label, field) \
+		< sizeof_namespace_label(ndd))
+
 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
 	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
 		(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \

[PATCH 2/9] libnvdimm, label: add v1.2 interleave-set-cookie algorithm

[Dan Williams]

The interleave-set-cookie algorithm is extended to incorporate all the
same components that are used to generate an nvdimm unique-id. For
backwards compatibility we still maintain the old v1.1 definition.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/acpi/nfit/core.c        |   53 ++++++++++++++++++++++++++++++++++++++-
 drivers/nvdimm/label.c          |    3 +-
 drivers/nvdimm/namespace_devs.c |    9 +++++--
 drivers/nvdimm/nd.h             |    3 +-
 drivers/nvdimm/region_devs.c    |   43 ++++++++++++++++++++++++++++----
 include/linux/libnvdimm.h       |    5 +++-
 6 files changed, 104 insertions(+), 12 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 097eff0b963d..db21f5b62562 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1663,12 +1663,29 @@ struct nfit_set_info {
 	} mapping[0];
 };
 
+struct nfit_set_info2 {
+	struct nfit_set_info_map2 {
+		u64 region_offset;
+		u32 serial_number;
+		u16 vendor_id;
+		u16 manufacturing_date;
+		u8  manufacturing_location;
+		u8  reserved[31];
+	} mapping[0];
+};
+
 static size_t sizeof_nfit_set_info(int num_mappings)
 {
 	return sizeof(struct nfit_set_info)
 		+ num_mappings * sizeof(struct nfit_set_info_map);
 }
 
+static size_t sizeof_nfit_set_info2(int num_mappings)
+{
+	return sizeof(struct nfit_set_info2)
+		+ num_mappings * sizeof(struct nfit_set_info_map2);
+}
+
 static int cmp_map_compat(const void *m0, const void *m1)
 {
 	const struct nfit_set_info_map *map0 = m0;
@@ -1690,6 +1707,18 @@ static int cmp_map(const void *m0, const void *m1)
 	return 0;
 }
 
+static int cmp_map2(const void *m0, const void *m1)
+{
+	const struct nfit_set_info_map2 *map0 = m0;
+	const struct nfit_set_info_map2 *map1 = m1;
+
+	if (map0->region_offset < map1->region_offset)
+		return -1;
+	else if (map0->region_offset > map1->region_offset)
+		return 1;
+	return 0;
+}
+
 /* Retrieve the nth entry referencing this spa */
 static struct acpi_nfit_memory_map *memdev_from_spa(
 		struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
@@ -1711,6 +1740,7 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 	struct device *dev = acpi_desc->dev;
 	struct nd_interleave_set *nd_set;
 	u16 nr = ndr_desc->num_mappings;
+	struct nfit_set_info2 *info2;
 	struct nfit_set_info *info;
 
 	if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
@@ -1725,9 +1755,15 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 	info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
+
+	info2 = devm_kzalloc(dev, sizeof_nfit_set_info2(nr), GFP_KERNEL);
+	if (!info2)
+		return -ENOMEM;
+
 	for (i = 0; i < nr; i++) {
 		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
 		struct nfit_set_info_map *map = &info->mapping[i];
+		struct nfit_set_info_map2 *map2 = &info2->mapping[i];
 		struct nvdimm *nvdimm = mapping->nvdimm;
 		struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 		struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
@@ -1740,19 +1776,32 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 
 		map->region_offset = memdev->region_offset;
 		map->serial_number = nfit_mem->dcr->serial_number;
+
+		map2->region_offset = memdev->region_offset;
+		map2->serial_number = nfit_mem->dcr->serial_number;
+		map2->vendor_id = nfit_mem->dcr->vendor_id;
+		map2->manufacturing_date = nfit_mem->dcr->manufacturing_date;
+		map2->manufacturing_location = nfit_mem->dcr->manufacturing_location;
 	}
 
+	/* v1.1 namespaces */
 	sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
 			cmp_map, NULL);
-	nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
+	nd_set->cookie1 = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
+
+	/* v1.2 namespaces */
+	sort(&info2->mapping[0], nr, sizeof(struct nfit_set_info_map2),
+			cmp_map2, NULL);
+	nd_set->cookie2 = nd_fletcher64(info, sizeof_nfit_set_info2(nr), 0);
 
-	/* support namespaces created with the wrong sort order */
+	/* support v1.1 namespaces created with the wrong sort order */
 	sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
 			cmp_map_compat, NULL);
 	nd_set->altcookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
 
 	ndr_desc->nd_set = nd_set;
 	devm_kfree(dev, info);
+	devm_kfree(dev, info2);
 
 	return 0;
 }
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index d6233d220bfd..1aacd4866c76 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -553,7 +553,6 @@ static int __pmem_label_update(struct nd_region *nd_region,
 		struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
 		int pos)
 {
-	u64 cookie = nd_region_interleave_set_cookie(nd_region);
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 	struct nd_label_ent *label_ent, *victim = NULL;
 	struct nd_namespace_label *nd_label;
@@ -563,11 +562,13 @@ static int __pmem_label_update(struct nd_region *nd_region,
 	unsigned long *free;
 	u32 nslot, slot;
 	size_t offset;
+	u64 cookie;
 	int rc;
 
 	if (!preamble_next(ndd, &nsindex, &free, &nslot))
 		return -ENXIO;
 
+	cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
 	nd_label_gen_id(&label_id, nspm->uuid, 0);
 	for_each_dpa_resource(ndd, res)
 		if (strcmp(res->name, label_id.id) == 0)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 2f9dfbd2dbec..51f304fe8a52 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1698,10 +1698,11 @@ static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
  * @nd_label: target pmem namespace label to evaluate
  */
 struct device *create_namespace_pmem(struct nd_region *nd_region,
+		struct nd_namespace_index *nsindex,
 		struct nd_namespace_label *nd_label)
 {
+	u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
 	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
-	u64 cookie = nd_region_interleave_set_cookie(nd_region);
 	struct nd_label_ent *label_ent;
 	struct nd_namespace_pmem *nspm;
 	struct nd_mapping *nd_mapping;
@@ -2108,7 +2109,11 @@ static struct device **scan_labels(struct nd_region *nd_region)
 				goto err;
 			devs[count++] = dev;
 		} else {
-			dev = create_namespace_pmem(nd_region, nd_label);
+			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:
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 28d9f4481547..ad4e518940c9 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -336,7 +336,8 @@ static inline struct device *nd_dax_create(struct nd_region *nd_region)
 struct nd_region *to_nd_region(struct device *dev);
 int nd_region_to_nstype(struct nd_region *nd_region);
 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
-u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
+u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
+		struct nd_namespace_index *nsindex);
 u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
 void nvdimm_bus_lock(struct device *dev);
 void nvdimm_bus_unlock(struct device *dev);
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index b550edf2571f..282b8991ea83 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -307,13 +307,41 @@ static ssize_t set_cookie_show(struct device *dev,
 {
 	struct nd_region *nd_region = to_nd_region(dev);
 	struct nd_interleave_set *nd_set = nd_region->nd_set;
+	ssize_t rc = 0;
 
 	if (is_nd_pmem(dev) && nd_set)
 		/* pass, should be precluded by region_visible */;
 	else
 		return -ENXIO;
 
-	return sprintf(buf, "%#llx\n", nd_set->cookie);
+	/*
+	 * The cookie to show depends on which specification of the
+	 * labels we are using. If there are not labels then default to
+	 * the v1.1 namespace label cookie definition. To read all this
+	 * data we need to wait for probing to settle.
+	 */
+	device_lock(dev);
+	nvdimm_bus_lock(dev);
+	wait_nvdimm_bus_probe_idle(dev);
+	if (nd_region->ndr_mappings) {
+		struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+		if (ndd) {
+			struct nd_namespace_index *nsindex;
+
+			nsindex = to_namespace_index(ndd, ndd->ns_current);
+			rc = sprintf(buf, "%#llx\n",
+					nd_region_interleave_set_cookie(nd_region,
+						nsindex));
+		}
+	}
+	nvdimm_bus_unlock(dev);
+	device_unlock(dev);
+
+	if (rc)
+		return rc;
+	return sprintf(buf, "%#llx\n", nd_set->cookie1);
 }
 static DEVICE_ATTR_RO(set_cookie);
 
@@ -564,13 +592,18 @@ struct attribute_group nd_region_attribute_group = {
 };
 EXPORT_SYMBOL_GPL(nd_region_attribute_group);
 
-u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
+u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
+		struct nd_namespace_index *nsindex)
 {
 	struct nd_interleave_set *nd_set = nd_region->nd_set;
 
-	if (nd_set)
-		return nd_set->cookie;
-	return 0;
+	if (!nd_set)
+		return 0;
+
+	if (nsindex && __le16_to_cpu(nsindex->major) == 1
+			&& __le16_to_cpu(nsindex->minor) == 1)
+		return nd_set->cookie1;
+	return nd_set->cookie2;
 }
 
 u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region)
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 6c807017128d..722cdf21429f 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -71,7 +71,10 @@ struct nd_cmd_desc {
 };
 
 struct nd_interleave_set {
-	u64 cookie;
+	/* v1.1 definition of the interleave-set-cookie algorithm */
+	u64 cookie1;
+	/* v1.2 definition of the interleave-set-cookie algorithm */
+	u64 cookie2;
 	/* compatibility with initial buggy Linux implementation */
 	u64 altcookie;
 };

[PATCH 3/9] libnvdimm, label: honor the lba size specified in v1.2 labels

[Dan Williams]

Previously we only honored the lba size for blk-aperture mode
namespaces. For pmem namespaces the lba size was just assumed to be 512.
With the new v1.2 label definition and compatibility with other
operating environments, the ->lbasize property is now respected for pmem
namespaces.

Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/namespace_devs.c |   65 ++++++++++++++++++++++++++++++++-------
 drivers/nvdimm/nd.h             |    1 +
 drivers/nvdimm/pmem.c           |    1 +
 include/linux/nd.h              |    2 +
 4 files changed, 57 insertions(+), 12 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 51f304fe8a52..e034b003a5e2 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -163,6 +163,29 @@ bool pmem_should_map_pages(struct device *dev)
 }
 EXPORT_SYMBOL(pmem_should_map_pages);
 
+unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
+{
+	if (is_namespace_pmem(&ndns->dev)) {
+		struct nd_namespace_pmem *nspm;
+
+		nspm = to_nd_namespace_pmem(&ndns->dev);
+		if (nspm->lbasize == 0 || nspm->lbasize == 512)
+			/* default */;
+		else if (nspm->lbasize == 4096)
+			return 4096;
+		else
+			dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
+					nspm->lbasize);
+	}
+
+	/*
+	 * There is no namespace label (is_namespace_io()), or the label
+	 * indicates the default sector size.
+	 */
+	return 512;
+}
+EXPORT_SYMBOL(pmem_sector_size);
+
 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 		char *name)
 {
@@ -1283,28 +1306,49 @@ static ssize_t resource_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(resource);
 
-static const unsigned long ns_lbasize_supported[] = { 512, 520, 528,
+static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
 	4096, 4104, 4160, 4224, 0 };
 
+static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
+
 static ssize_t sector_size_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+	if (is_namespace_blk(dev)) {
+		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 
-	if (!is_namespace_blk(dev))
-		return -ENXIO;
+		return nd_sector_size_show(nsblk->lbasize,
+				blk_lbasize_supported, buf);
+	}
 
-	return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
+	if (is_namespace_pmem(dev)) {
+		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+		return nd_sector_size_show(nspm->lbasize,
+				pmem_lbasize_supported, buf);
+	}
+	return -ENXIO;
 }
 
 static ssize_t sector_size_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t len)
 {
-	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 	struct nd_region *nd_region = to_nd_region(dev->parent);
+	const unsigned long *supported;
+	unsigned long *lbasize;
 	ssize_t rc = 0;
 
-	if (!is_namespace_blk(dev))
+	if (is_namespace_blk(dev)) {
+		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
+
+		lbasize = &nsblk->lbasize;
+		supported = blk_lbasize_supported;
+	} else if (is_namespace_pmem(dev)) {
+		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+		lbasize = &nspm->lbasize;
+		supported = pmem_lbasize_supported;
+	} else
 		return -ENXIO;
 
 	device_lock(dev);
@@ -1312,8 +1356,7 @@ static ssize_t sector_size_store(struct device *dev,
 	if (to_ndns(dev)->claim)
 		rc = -EBUSY;
 	if (rc >= 0)
-		rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
-				ns_lbasize_supported);
+		rc = nd_sector_size_store(dev, buf, lbasize, supported);
 	if (rc >= 0)
 		rc = nd_namespace_label_update(nd_region, dev);
 	dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
@@ -1458,9 +1501,6 @@ static umode_t namespace_visible(struct kobject *kobj,
 		if (a == &dev_attr_size.attr)
 			return 0644;
 
-		if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
-			return 0;
-
 		return a->mode;
 	}
 
@@ -1795,6 +1835,7 @@ struct device *create_namespace_pmem(struct nd_region *nd_region,
 				NSLABEL_NAME_LEN, GFP_KERNEL);
 		nspm->uuid = kmemdup((void __force *) label0->uuid,
 				NSLABEL_UUID_LEN, GFP_KERNEL);
+		nspm->lbasize = __le64_to_cpu(label0->lbasize);
 	}
 
 	if (!nspm->alt_name || !nspm->uuid) {
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index ad4e518940c9..17cecb38dfc9 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -356,6 +356,7 @@ int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 		char *name);
+unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
 void nvdimm_badblocks_populate(struct nd_region *nd_region,
 		struct badblocks *bb, const struct resource *res);
 #if IS_ENABLED(CONFIG_ND_CLAIM)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index c544d466ea51..5c45e178bd4a 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -342,6 +342,7 @@ static int pmem_attach_disk(struct device *dev,
 	blk_queue_write_cache(q, true, true);
 	blk_queue_make_request(q, pmem_make_request);
 	blk_queue_physical_block_size(q, PAGE_SIZE);
+	blk_queue_logical_block_size(q, pmem_sector_size(ndns));
 	blk_queue_max_hw_sectors(q, UINT_MAX);
 	blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
 	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
diff --git a/include/linux/nd.h b/include/linux/nd.h
index 194b8e002ea7..d8f5023b49ae 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -75,12 +75,14 @@ struct nd_namespace_io {
 /**
  * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
  * @nsio: device and system physical address range to drive
+ * @lbasize: logical sector size for the namespace in block-device-mode
  * @alt_name: namespace name supplied in the dimm label
  * @uuid: namespace name supplied in the dimm label
  * @id: ida allocated id
  */
 struct nd_namespace_pmem {
 	struct nd_namespace_io nsio;
+	unsigned long lbasize;
 	char *alt_name;
 	u8 *uuid;
 	int id;

[PATCH 4/9] libnvdimm, label: populate the type_guid property for v1.2 namespaces

[Dan Williams]

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        |   15 +++++++---
 drivers/nvdimm/label.c          |    6 ++++
 drivers/nvdimm/namespace_devs.c |   57 ++++++++++++++++++++++++++-------------
 include/linux/libnvdimm.h       |    3 ++
 4 files changed, 57 insertions(+), 24 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index db21f5b62562..83ee3c829411 100644
--- a/drivers/acpi/nfit/core.c
+++ b/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)
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 1aacd4866c76..d8b87d3a0ebe 100644
--- a/drivers/nvdimm/label.c
+++ b/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);
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index e034b003a5e2..e101aec186c7 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/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);
@@ -2144,31 +2164,30 @@ 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:
-					/* skip invalid labels */
-					continue;
-				case -ENODEV:
-					/* fallthrough to seed creation */
-					break;
-				default:
-					goto err;
-				}
-			} else
-				devs[count++] = dev;
 		}
+
+		if (IS_ERR(dev)) {
+			switch (PTR_ERR(dev)) {
+			case -EAGAIN:
+				/* skip invalid labels */
+				continue;
+			case -ENODEV:
+				/* fallthrough to seed creation */
+				break;
+			default:
+				goto err;
+			}
+		} else
+			devs[count++] = dev;
+
 	}
 
 	dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 722cdf21429f..4b9f178c82e6 100644
--- a/include/linux/libnvdimm.h
+++ b/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 {

[PATCH 5/9] libnvdimm, label: populate 'isetcookie' for blk-aperture namespaces

[Dan Williams]

Starting with the v1.2 definition of namespace labels, the isetcookie
field is populated and validated for blk-aperture namespaces. This adds
some safety against inadvertent copying of namespace labels from one
DIMM-device to another.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/acpi/nfit/core.c        |    7 +------
 drivers/nvdimm/label.c          |   12 +++++++++++-
 drivers/nvdimm/namespace_devs.c |   20 ++++++++++++++------
 3 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 83ee3c829411..47d2dbb45695 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1736,12 +1736,12 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 		struct nd_region_desc *ndr_desc,
 		struct acpi_nfit_system_address *spa)
 {
-	int i, spa_type = nfit_spa_type(spa);
 	struct device *dev = acpi_desc->dev;
 	struct nd_interleave_set *nd_set;
 	u16 nr = ndr_desc->num_mappings;
 	struct nfit_set_info2 *info2;
 	struct nfit_set_info *info;
+	int i;
 
 	nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
 	if (!nd_set)
@@ -1749,11 +1749,6 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 	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;
-
 	info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index d8b87d3a0ebe..ba0582fb0e21 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -787,7 +787,17 @@ static int __blk_label_update(struct nd_region *nd_region,
 		nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL);
 		nd_label->nlabel = __cpu_to_le16(0); /* N/A */
 		nd_label->position = __cpu_to_le16(0); /* N/A */
-		nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
+
+		/*
+		 * Use the presence of the type_guid as a flag to
+		 * determine isetcookie usage for blk-aperture
+		 * namespaces.
+		 */
+		if (namespace_label_has(ndd, type_guid))
+			nd_label->isetcookie = __cpu_to_le64(nd_set->cookie2);
+		else
+			nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
+
 		nd_label->dpa = __cpu_to_le64(res->start);
 		nd_label->rawsize = __cpu_to_le64(resource_size(res));
 		nd_label->lbasize = __cpu_to_le64(nsblk->lbasize);
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index e101aec186c7..7aba9a569c8e 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -2065,12 +2065,20 @@ struct device *create_namespace_blk(struct nd_region *nd_region,
 	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);
+	if (namespace_label_has(ndd, type_guid)) {
+		if (!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);
+		}
+
+		if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
+			dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
+					nd_set->cookie2,
+					__le64_to_cpu(nd_label->isetcookie));
+			return ERR_PTR(-EAGAIN);
+		}
 	}
 
 	nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);

[PATCH 6/9] libnvdimm, label: update 'nlabel' and 'position' handling for local namespaces

[Dan Williams]

The v1.2 namespace label specification requires 'nlabel' and 'position'
to be valid for the first ("lowest dpa") label in the set. It also
requires all non-first labels to set those fields to 0xff.

Linux does not much care if these values are correct, because we can
just trust the count of labels with the matching uuid like the v1.1
case. However, we set them correctly in case other environments care.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/label.c |   33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index ba0582fb0e21..d7f9916c6ed5 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -696,6 +696,7 @@ static int __blk_label_update(struct nd_region *nd_region,
 	struct resource *res, **old_res_list;
 	struct nd_label_id label_id;
 	u8 uuid[NSLABEL_UUID_LEN];
+	int min_dpa_idx = 0;
 	LIST_HEAD(list);
 	u32 nslot, slot;
 
@@ -767,6 +768,18 @@ static int __blk_label_update(struct nd_region *nd_region,
 		}
 	}
 
+	/*
+	 * Find the resource associated with the first label in the set
+	 * per the v1.2 namespace specification.
+	 */
+	for (i = 0; i < nsblk->num_resources; i++) {
+		struct resource *min = nsblk->res[min_dpa_idx];
+
+		res = nsblk->res[i];
+		if (res->start < min->start)
+			min_dpa_idx = i;
+	}
+
 	for (i = 0; i < nsblk->num_resources; i++) {
 		size_t offset;
 
@@ -785,18 +798,26 @@ static int __blk_label_update(struct nd_region *nd_region,
 			memcpy(nd_label->name, nsblk->alt_name,
 					NSLABEL_NAME_LEN);
 		nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL);
-		nd_label->nlabel = __cpu_to_le16(0); /* N/A */
-		nd_label->position = __cpu_to_le16(0); /* N/A */
 
 		/*
 		 * Use the presence of the type_guid as a flag to
-		 * determine isetcookie usage for blk-aperture
-		 * namespaces.
+		 * determine isetcookie usage and nlabel + position
+		 * policy for blk-aperture namespaces.
 		 */
-		if (namespace_label_has(ndd, type_guid))
+		if (namespace_label_has(ndd, type_guid)) {
+			if (i == min_dpa_idx) {
+				nd_label->nlabel = __cpu_to_le16(nsblk->num_resources);
+				nd_label->position = __cpu_to_le16(0);
+			} else {
+				nd_label->nlabel = __cpu_to_le16(0xffff);
+				nd_label->position = __cpu_to_le16(0xffff);
+			}
 			nd_label->isetcookie = __cpu_to_le64(nd_set->cookie2);
-		else
+		} else {
+			nd_label->nlabel = __cpu_to_le16(0); /* N/A */
+			nd_label->position = __cpu_to_le16(0); /* N/A */
 			nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
+		}
 
 		nd_label->dpa = __cpu_to_le64(res->start);
 		nd_label->rawsize = __cpu_to_le64(resource_size(res));

[PATCH 7/9] libnvdimm, label: add v1.2 label checksum support

[Dan Williams]

The v1.2 namespace label specification adds a fletcher checksum to each
label instance. Add generation and validation support for the new field.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/label.c |   39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index d7f9916c6ed5..c503362a03c7 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -326,7 +326,8 @@ static bool preamble_next(struct nvdimm_drvdata *ndd,
 			free, nslot);
 }
 
-static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot)
+static bool slot_valid(struct nvdimm_drvdata *ndd,
+		struct nd_namespace_label *nd_label, u32 slot)
 {
 	/* check that we are written where we expect to be written */
 	if (slot != __le32_to_cpu(nd_label->slot))
@@ -337,6 +338,21 @@ static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot)
 				| __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
 		return false;
 
+	/* check checksum */
+	if (namespace_label_has(ndd, checksum)) {
+		u64 sum, sum_save;
+
+		sum_save = __le64_to_cpu(nd_label->checksum);
+		nd_label->checksum = __cpu_to_le64(0);
+		sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
+		nd_label->checksum = __cpu_to_le64(sum_save);
+		if (sum != sum_save) {
+			dev_dbg(ndd->dev, "%s fail checksum. slot: %d expect: %#llx\n",
+				__func__, slot, sum);
+			return false;
+		}
+	}
+
 	return true;
 }
 
@@ -359,7 +375,7 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
 
 		nd_label = to_label(ndd, slot);
 
-		if (!slot_valid(nd_label, slot))
+		if (!slot_valid(ndd, nd_label, slot))
 			continue;
 
 		memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
@@ -391,7 +407,7 @@ int nd_label_active_count(struct nvdimm_drvdata *ndd)
 
 		nd_label = to_label(ndd, slot);
 
-		if (!slot_valid(nd_label, slot)) {
+		if (!slot_valid(ndd, nd_label, slot)) {
 			u32 label_slot = __le32_to_cpu(nd_label->slot);
 			u64 size = __le64_to_cpu(nd_label->rawsize);
 			u64 dpa = __le64_to_cpu(nd_label->dpa);
@@ -419,7 +435,7 @@ struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
 		struct nd_namespace_label *nd_label;
 
 		nd_label = to_label(ndd, slot);
-		if (!slot_valid(nd_label, slot))
+		if (!slot_valid(ndd, nd_label, slot))
 			continue;
 
 		if (n-- == 0)
@@ -600,6 +616,13 @@ static int __pmem_label_update(struct nd_region *nd_region,
 	nd_label->slot = __cpu_to_le32(slot);
 	if (namespace_label_has(ndd, type_guid))
 		guid_copy(&nd_label->type_guid, &nd_set->type_guid);
+	if (namespace_label_has(ndd, checksum)) {
+		u64 sum;
+
+		nd_label->checksum = __cpu_to_le64(0);
+		sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
+		nd_label->checksum = __cpu_to_le64(sum);
+	}
 	nd_dbg_dpa(nd_region, ndd, res, "%s\n", __func__);
 
 	/* update label */
@@ -825,6 +848,14 @@ static int __blk_label_update(struct nd_region *nd_region,
 		nd_label->slot = __cpu_to_le32(slot);
 		if (namespace_label_has(ndd, type_guid))
 			guid_copy(&nd_label->type_guid, &nd_set->type_guid);
+		if (namespace_label_has(ndd, checksum)) {
+			u64 sum;
+
+			nd_label->checksum = __cpu_to_le64(0);
+			sum = nd_fletcher64(nd_label,
+					sizeof_namespace_label(ndd), 1);
+			nd_label->checksum = __cpu_to_le64(sum);
+		}
 
 		/* update label */
 		offset = nd_label_offset(ndd, nd_label);

[PATCH 8/9] libnvdimm, label: add address abstraction identifiers

[Dan Williams]

Starting with v1.2 labels, 'address abstractions' can be hinted via an
address abstraction id that implies an info-block format. The standard
address abstraction in the specification is the v2 format of the
Block-Translation-Table (BTT). Support for that is saved for a later
patch, for now we add support for the Linux supported address
abstractions BTT (v1), PFN, and DAX.

The new 'holder_class' attribute for namespace devices is added for
tooling to specify the 'abstraction_guid' to store in the namespace label.
For v1.1 labels this field is undefined and any setting of
'holder_class' away from the default 'none' value will only have effect
until the driver is unloaded. Setting 'holder_class' requires that
whatever device tries to claim the namespace must be of the specified
class.

Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/btt_devs.c       |    8 ++++
 drivers/nvdimm/claim.c          |   28 +++++++++++++++
 drivers/nvdimm/core.c           |    3 ++
 drivers/nvdimm/dax_devs.c       |    8 ++++
 drivers/nvdimm/label.c          |   58 +++++++++++++++++++++++++++++++
 drivers/nvdimm/label.h          |    5 +++
 drivers/nvdimm/namespace_devs.c |   74 +++++++++++++++++++++++++++++++++++++++
 drivers/nvdimm/nd.h             |    1 +
 drivers/nvdimm/pfn_devs.c       |    8 ++++
 include/linux/nd.h              |   10 +++++
 10 files changed, 203 insertions(+)

diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index 4c989bb9a8a0..31d875a91569 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -295,6 +295,14 @@ int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns)
 	if (ndns->force_raw)
 		return -ENODEV;
 
+	switch (ndns->claim_class) {
+	case NVDIMM_CCLASS_NONE:
+	case NVDIMM_CCLASS_BTT:
+		break;
+	default:
+		return -ENODEV;
+	}
+
 	nvdimm_bus_lock(&ndns->dev);
 	btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns);
 	nvdimm_bus_unlock(&ndns->dev);
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index 7ceb5fa4f2a1..de9b1cce242e 100644
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -184,6 +184,34 @@ ssize_t nd_namespace_store(struct device *dev,
 	}
 
 	ndns = to_ndns(found);
+
+	switch (ndns->claim_class) {
+	case NVDIMM_CCLASS_NONE:
+		break;
+	case NVDIMM_CCLASS_BTT:
+		if (!is_nd_btt(dev)) {
+			len = -EBUSY;
+			goto out_attach;
+		}
+		break;
+	case NVDIMM_CCLASS_PFN:
+		if (!is_nd_pfn(dev)) {
+			len = -EBUSY;
+			goto out_attach;
+		}
+		break;
+	case NVDIMM_CCLASS_DAX:
+		if (!is_nd_dax(dev)) {
+			len = -EBUSY;
+			goto out_attach;
+		}
+		break;
+	default:
+		len = -EBUSY;
+		goto out_attach;
+		break;
+	}
+
 	if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
 		dev_dbg(dev, "%s too small to host\n", name);
 		len = -ENXIO;
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 2dee908e4bae..ed0bf174d128 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -699,6 +699,9 @@ static __init int libnvdimm_init(void)
 	rc = nd_region_init();
 	if (rc)
 		goto err_region;
+
+	nd_label_init();
+
 	return 0;
  err_region:
 	nvdimm_exit();
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index c1b6556aea6e..59f676381ae5 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -111,6 +111,14 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
 	if (ndns->force_raw)
 		return -ENODEV;
 
+	switch (ndns->claim_class) {
+	case NVDIMM_CCLASS_NONE:
+	case NVDIMM_CCLASS_DAX:
+		break;
+	default:
+		return -ENODEV;
+	}
+
 	nvdimm_bus_lock(&ndns->dev);
 	nd_dax = nd_dax_alloc(nd_region);
 	nd_pfn = &nd_dax->nd_pfn;
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index c503362a03c7..837bf21c8555 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -12,6 +12,7 @@
  */
 #include <linux/device.h>
 #include <linux/ndctl.h>
+#include <linux/uuid.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/nd.h>
@@ -19,6 +20,10 @@
 #include "label.h"
 #include "nd.h"
 
+static guid_t nvdimm_btt_guid;
+static guid_t nvdimm_pfn_guid;
+static guid_t nvdimm_dax_guid;
+
 static u32 best_seq(u32 a, u32 b)
 {
 	a &= NSINDEX_SEQ_MASK;
@@ -565,10 +570,44 @@ static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
 		- (unsigned long) to_namespace_index(ndd, 0);
 }
 
+enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid)
+{
+	if (guid_equal(guid, &nvdimm_btt_guid))
+		return NVDIMM_CCLASS_BTT;
+	else if (guid_equal(guid, &nvdimm_pfn_guid))
+		return NVDIMM_CCLASS_PFN;
+	else if (guid_equal(guid, &nvdimm_dax_guid))
+		return NVDIMM_CCLASS_DAX;
+	else if (guid_equal(guid, &guid_null))
+		return NVDIMM_CCLASS_NONE;
+
+	return NVDIMM_CCLASS_UNKNOWN;
+}
+
+static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
+	guid_t *target)
+{
+	if (claim_class == NVDIMM_CCLASS_BTT)
+		return &nvdimm_btt_guid;
+	else if (claim_class == NVDIMM_CCLASS_PFN)
+		return &nvdimm_pfn_guid;
+	else if (claim_class == NVDIMM_CCLASS_DAX)
+		return &nvdimm_dax_guid;
+	else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
+		/*
+		 * If we're modifying a namespace for which we don't
+		 * know the claim_class, don't touch the existing guid.
+		 */
+		return target;
+	} else
+		return &guid_null;
+}
+
 static int __pmem_label_update(struct nd_region *nd_region,
 		struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
 		int pos)
 {
+	struct nd_namespace_common *ndns = &nspm->nsio.common;
 	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;
@@ -616,6 +655,10 @@ static int __pmem_label_update(struct nd_region *nd_region,
 	nd_label->slot = __cpu_to_le32(slot);
 	if (namespace_label_has(ndd, type_guid))
 		guid_copy(&nd_label->type_guid, &nd_set->type_guid);
+	if (namespace_label_has(ndd, abstraction_guid))
+		guid_copy(&nd_label->abstraction_guid,
+				to_abstraction_guid(ndns->claim_class,
+					&nd_label->abstraction_guid));
 	if (namespace_label_has(ndd, checksum)) {
 		u64 sum;
 
@@ -711,6 +754,7 @@ static int __blk_label_update(struct nd_region *nd_region,
 {
 	int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
 	struct nd_interleave_set *nd_set = nd_region->nd_set;
+	struct nd_namespace_common *ndns = &nsblk->common;
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 	struct nd_namespace_label *nd_label;
 	struct nd_label_ent *label_ent, *e;
@@ -848,6 +892,11 @@ static int __blk_label_update(struct nd_region *nd_region,
 		nd_label->slot = __cpu_to_le32(slot);
 		if (namespace_label_has(ndd, type_guid))
 			guid_copy(&nd_label->type_guid, &nd_set->type_guid);
+		if (namespace_label_has(ndd, abstraction_guid))
+			guid_copy(&nd_label->abstraction_guid,
+					to_abstraction_guid(ndns->claim_class,
+						&nd_label->abstraction_guid));
+
 		if (namespace_label_has(ndd, checksum)) {
 			u64 sum;
 
@@ -1101,3 +1150,12 @@ int nd_blk_namespace_label_update(struct nd_region *nd_region,
 
 	return __blk_label_update(nd_region, nd_mapping, nsblk, count);
 }
+
+int __init nd_label_init(void)
+{
+	WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
+	WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid));
+	WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid));
+
+	return 0;
+}
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index f39bfb31f72f..7c8e2cc9e73e 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -112,6 +112,10 @@ struct nd_namespace_label {
 	__le64 checksum;
 };
 
+#define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a"
+#define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225"
+#define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088"
+
 /**
  * struct nd_label_id - identifier string for dpa allocation
  * @id: "{blk|pmem}-<namespace uuid>"
@@ -142,6 +146,7 @@ struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
 u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
 bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
 u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
+enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid);
 struct nd_region;
 struct nd_namespace_pmem;
 struct nd_namespace_blk;
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 7aba9a569c8e..f05d9b0672bf 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1425,6 +1425,69 @@ static ssize_t holder_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(holder);
 
+static ssize_t __holder_class_store(struct device *dev, const char *buf)
+{
+	struct nd_namespace_common *ndns = to_ndns(dev);
+
+	if (dev->driver || ndns->claim)
+		return -EBUSY;
+
+	if (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0)
+		ndns->claim_class = NVDIMM_CCLASS_BTT;
+	else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0)
+		ndns->claim_class = NVDIMM_CCLASS_PFN;
+	else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0)
+		ndns->claim_class = NVDIMM_CCLASS_DAX;
+	else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0)
+		ndns->claim_class = NVDIMM_CCLASS_NONE;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static ssize_t holder_class_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t len)
+{
+	struct nd_region *nd_region = to_nd_region(dev->parent);
+	ssize_t rc;
+
+	device_lock(dev);
+	nvdimm_bus_lock(dev);
+	wait_nvdimm_bus_probe_idle(dev);
+	rc = __holder_class_store(dev, buf);
+	if (rc >= 0)
+		rc = nd_namespace_label_update(nd_region, dev);
+	dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
+	nvdimm_bus_unlock(dev);
+	device_unlock(dev);
+
+	return rc < 0 ? rc : len;
+}
+
+static ssize_t holder_class_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nd_namespace_common *ndns = to_ndns(dev);
+	ssize_t rc;
+
+	device_lock(dev);
+	if (ndns->claim_class == NVDIMM_CCLASS_NONE)
+		rc = sprintf(buf, "\n");
+	else if (ndns->claim_class == NVDIMM_CCLASS_BTT)
+		rc = sprintf(buf, "btt\n");
+	else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
+		rc = sprintf(buf, "pfn\n");
+	else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
+		rc = sprintf(buf, "dax\n");
+	else
+		rc = sprintf(buf, "<unknown>\n");
+	device_unlock(dev);
+
+	return rc;
+}
+static DEVICE_ATTR_RW(holder_class);
+
 static ssize_t mode_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -1483,6 +1546,7 @@ static struct attribute *nd_namespace_attributes[] = {
 	&dev_attr_force_raw.attr,
 	&dev_attr_sector_size.attr,
 	&dev_attr_dpa_extents.attr,
+	&dev_attr_holder_class.attr,
 	NULL,
 };
 
@@ -1506,6 +1570,7 @@ static umode_t namespace_visible(struct kobject *kobj,
 
 	if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
 			|| a == &dev_attr_holder.attr
+			|| a == &dev_attr_holder_class.attr
 			|| a == &dev_attr_force_raw.attr
 			|| a == &dev_attr_mode.attr)
 		return a->mode;
@@ -1827,6 +1892,7 @@ struct device *create_namespace_pmem(struct nd_region *nd_region,
 	/* Calculate total size and populate namespace properties from label0 */
 	for (i = 0; i < nd_region->ndr_mappings; i++) {
 		struct nd_namespace_label *label0;
+		struct nvdimm_drvdata *ndd;
 
 		nd_mapping = &nd_region->mapping[i];
 		label_ent = list_first_entry_or_null(&nd_mapping->labels,
@@ -1847,6 +1913,11 @@ struct device *create_namespace_pmem(struct nd_region *nd_region,
 		nspm->uuid = kmemdup((void __force *) label0->uuid,
 				NSLABEL_UUID_LEN, GFP_KERNEL);
 		nspm->lbasize = __le64_to_cpu(label0->lbasize);
+		ndd = to_ndd(nd_mapping);
+		if (namespace_label_has(ndd, abstraction_guid))
+			nspm->nsio.common.claim_class
+				= to_nvdimm_cclass(&label0->abstraction_guid);
+
 	}
 
 	if (!nspm->alt_name || !nspm->uuid) {
@@ -2091,6 +2162,9 @@ struct device *create_namespace_blk(struct nd_region *nd_region,
 	nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
 	nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
 			GFP_KERNEL);
+	if (namespace_label_has(ndd, abstraction_guid))
+		nsblk->common.claim_class
+			= to_nvdimm_cclass(&nd_label->abstraction_guid);
 	if (!nsblk->uuid)
 		goto blk_err;
 	memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 17cecb38dfc9..8cabd836df0e 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -235,6 +235,7 @@ ssize_t nd_sector_size_store(struct device *dev, const char *buf,
 		unsigned long *current_lbasize, const unsigned long *supported);
 int __init nvdimm_init(void);
 int __init nd_region_init(void);
+int __init nd_label_init(void);
 void nvdimm_exit(void);
 void nd_region_exit(void);
 struct nvdimm;
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index a6c403600d19..5e4041276d6f 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -471,6 +471,14 @@ int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
 	if (ndns->force_raw)
 		return -ENODEV;
 
+	switch (ndns->claim_class) {
+	case NVDIMM_CCLASS_NONE:
+	case NVDIMM_CCLASS_PFN:
+		break;
+	default:
+		return -ENODEV;
+	}
+
 	nvdimm_bus_lock(&ndns->dev);
 	nd_pfn = nd_pfn_alloc(nd_region);
 	pfn_dev = nd_pfn_devinit(nd_pfn, ndns);
diff --git a/include/linux/nd.h b/include/linux/nd.h
index d8f5023b49ae..96069c543890 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -21,6 +21,14 @@ enum nvdimm_event {
 	NVDIMM_REVALIDATE_POISON,
 };
 
+enum nvdimm_claim_class {
+	NVDIMM_CCLASS_NONE,
+	NVDIMM_CCLASS_BTT,
+	NVDIMM_CCLASS_PFN,
+	NVDIMM_CCLASS_DAX,
+	NVDIMM_CCLASS_UNKNOWN,
+};
+
 struct nd_device_driver {
 	struct device_driver drv;
 	unsigned long type;
@@ -41,12 +49,14 @@ static inline struct nd_device_driver *to_nd_device_driver(
  * @force_raw: ignore other personalities for the namespace (e.g. btt)
  * @dev: device model node
  * @claim: when set a another personality has taken ownership of the namespace
+ * @claim_class: restrict claim type to a given class
  * @rw_bytes: access the raw namespace capacity with byte-aligned transfers
  */
 struct nd_namespace_common {
 	int force_raw;
 	struct device dev;
 	struct device *claim;
+	enum nvdimm_claim_class claim_class;
 	int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
 			void *buf, size_t size, int rw, unsigned long flags);
 };

[PATCH 9/9] libnvdimm, label: switch to using v1.2 labels by default

[Dan Williams]

The rules for which version of the label specification are in effect at
any given point in time are as follows:

1/ If a DIMM has an existing / valid index block then the version
   specified is used regardless if it is a previous version.

2/ By default when the kernel is initializing new index blocks the
   latest specification version (v1.2 at time of writing) is used.

3/ An environment that wants to force create v1.1 label-sets must
   arrange for userspace to disable all active regions / namespaces /
   dimms and write a valid set of v1.1 index blocks to the dimms.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/nvdimm/label.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 837bf21c8555..235f2089fab2 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -222,9 +222,10 @@ int nd_label_validate(struct nvdimm_drvdata *ndd)
 	 * need to know the size of the labels, and we can't trust the
 	 * size of the labels until we validate the index blocks.
 	 * Resolve this dependency loop by probing for known label
-	 * sizes.
+	 * sizes, but default to v1.2 256-byte namespace labels if
+	 * discovery fails.
 	 */
-	int label_size[] = { 256, 128 };
+	int label_size[] = { 128, 256 };
 	int i, rc;
 
 	for (i = 0; i < ARRAY_SIZE(label_size); i++) {
@@ -532,7 +533,10 @@ static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
 	nsindex->labeloff = __cpu_to_le64(offset);
 	nsindex->nslot = __cpu_to_le32(nslot);
 	nsindex->major = __cpu_to_le16(1);
-	nsindex->minor = __cpu_to_le16(1);
+	if (sizeof_namespace_label(ndd) < 256)
+		nsindex->minor = __cpu_to_le16(1);
+	else
+		nsindex->minor = __cpu_to_le16(2);
 	nsindex->checksum = __cpu_to_le64(0);
 	if (flags & ND_NSINDEX_INIT) {
 		unsigned long *free = (unsigned long *) nsindex->free;