Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fixes from Dan Williams:
 "A fix and regression test case for nvdimm namespace label
  compatibility.

  Details:

   - An "nvdimm namespace label" is metadata on an nvdimm that
     provisions dimm capacity into a "namespace" that can host a block
     device / dax-filesytem, or a device-dax character device.

     A namespace is an object that other operating environment and
     platform firmware needs to comprehend for capabilities like booting
     from an nvdimm.

     The label metadata contains a checksum that Linux was not
     calculating correctly leading to other environments rejecting the
     Linux label.

   These have received a build success notification from the kbuild
   robot, and a positive test result from Nick who reported the problem"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nfit, libnvdimm: fix interleave set cookie calculation
  tools/testing/nvdimm: make iset cookie predictable

4 files changed, 39 insertions, 5 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 7361d00818e2..662036bdc65e 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1603,7 +1603,7 @@ static size_t sizeof_nfit_set_info(int num_mappings)
                 + num_mappings * sizeof(struct nfit_set_info_map);
 }
 
-static int cmp_map(const void *m0, const void *m1)
+static int cmp_map_compat(const void *m0, const void *m1)
 {
         const struct nfit_set_info_map *map0 = m0;
         const struct nfit_set_info_map *map1 = m1;
@@ -1612,6 +1612,14 @@ static int cmp_map(const void *m0, const void *m1)
                         sizeof(u64));
 }
 
+static int cmp_map(const void *m0, const void *m1)
+{
+        const struct nfit_set_info_map *map0 = m0;
+        const struct nfit_set_info_map *map1 = m1;
+
+        return map0->region_offset - map1->region_offset;
+}
+
 /* 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)
@@ -1667,6 +1675,12 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
         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);
+
+        /* support 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);
 
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index ce3e8dfa10ad..1b481a5fb966 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1700,6 +1700,7 @@ static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
 struct device *create_namespace_pmem(struct nd_region *nd_region,
                 struct nd_namespace_label *nd_label)
 {
+        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;
@@ -1718,7 +1719,11 @@ struct device *create_namespace_pmem(struct nd_region *nd_region,
         if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
                 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
                                 nd_label->uuid);
-                return ERR_PTR(-EAGAIN);
+                if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
+                        return ERR_PTR(-EAGAIN);
+
+                dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
+                                nd_label->uuid);
         }
 
         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
@@ -1733,9 +1738,14 @@ struct device *create_namespace_pmem(struct nd_region *nd_region,
         res->name = dev_name(&nd_region->dev);
         res->flags = IORESOURCE_MEM;
 
-        for (i = 0; i < nd_region->ndr_mappings; i++)
-                if (!has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
-                        break;
+        for (i = 0; i < nd_region->ndr_mappings; i++) {
+                if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
+                        continue;
+                if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
+                        continue;
+                break;
+        }
+
         if (i < nd_region->ndr_mappings) {
                 struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);
 
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 35dd75057e16..2a99c83aa19f 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -328,6 +328,7 @@ 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_altcookie(struct nd_region *nd_region);
 void nvdimm_bus_lock(struct device *dev);
 void nvdimm_bus_unlock(struct device *dev);
 bool is_nvdimm_bus_locked(struct device *dev);
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 7cd705f3247c..b7cb5066d961 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -505,6 +505,15 @@ u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
         return 0;
 }
 
+u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region)
+{
+        struct nd_interleave_set *nd_set = nd_region->nd_set;
+
+        if (nd_set)
+                return nd_set->altcookie;
+        return 0;
+}
+
 void nd_mapping_free_labels(struct nd_mapping *nd_mapping)
 {
         struct nd_label_ent *label_ent, *e;