libnvdimm, namespace: sort namespaces by dpa at init

Add more determinism to initial namespace device-name assignments by
sorting the namespaces by starting dpa.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 35 insertions, 6 deletions

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 47d29632b937..f0536c2789e9 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -12,6 +12,7 @@
  */
 #include <linux/module.h>
 #include <linux/device.h>
+#include <linux/sort.h>
 #include <linux/slab.h>
 #include <linux/pmem.h>
 #include <linux/list.h>
@@ -66,17 +67,17 @@ static struct device_type namespace_blk_device_type = {
         .release = namespace_blk_release,
 };
 
-static bool is_namespace_pmem(struct device *dev)
+static bool is_namespace_pmem(const struct device *dev)
 {
         return dev ? dev->type == &namespace_pmem_device_type : false;
 }
 
-static bool is_namespace_blk(struct device *dev)
+static bool is_namespace_blk(const struct device *dev)
 {
         return dev ? dev->type == &namespace_blk_device_type : false;
 }
 
-static bool is_namespace_io(struct device *dev)
+static bool is_namespace_io(const struct device *dev)
 {
         return dev ? dev->type == &namespace_io_device_type : false;
 }
@@ -1919,6 +1920,31 @@ struct device *create_namespace_blk(struct nd_region *nd_region,
         return ERR_PTR(-ENXIO);
 }
 
+static int cmp_dpa(const void *a, const void *b)
+{
+        const struct device *dev_a = *(const struct device **) a;
+        const struct device *dev_b = *(const struct device **) b;
+        struct nd_namespace_blk *nsblk_a, *nsblk_b;
+        struct nd_namespace_pmem *nspm_a, *nspm_b;
+
+        if (is_namespace_io(dev_a))
+                return 0;
+
+        if (is_namespace_blk(dev_a)) {
+                nsblk_a = to_nd_namespace_blk(dev_a);
+                nsblk_b = to_nd_namespace_blk(dev_b);
+
+                return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
+                                sizeof(resource_size_t));
+        }
+
+        nspm_a = to_nd_namespace_pmem(dev_a);
+        nspm_b = to_nd_namespace_pmem(dev_b);
+
+        return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
+                        sizeof(resource_size_t));
+}
+
 static struct device **scan_labels(struct nd_region *nd_region)
 {
         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
@@ -2034,6 +2060,9 @@ static struct device **scan_labels(struct nd_region *nd_region)
                 }
         }
 
+        if (count > 1)
+                sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
+
         return devs;
 
  err:
diff --git a/include/linux/nd.h b/include/linux/nd.h
index ddcc7788305c..fa66aeed441a 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -107,19 +107,19 @@ struct nd_namespace_blk {
         struct resource **res;
 };
 
-static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
+static inline struct nd_namespace_io *to_nd_namespace_io(const struct device *dev)
 {
         return container_of(dev, struct nd_namespace_io, common.dev);
 }
 
-static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
+static inline struct nd_namespace_pmem *to_nd_namespace_pmem(const struct device *dev)
 {
         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
 
         return container_of(nsio, struct nd_namespace_pmem, nsio);
 }
 
-static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
+static inline struct nd_namespace_blk *to_nd_namespace_blk(const struct device *dev)
 {
         return container_of(dev, struct nd_namespace_blk, common.dev);
 }