libnvdimm, namespace: allow creation of multiple pmem-namespaces per region

Similar to BLK regions, publish new seed namespace devices to allow
unused PMEM region capacity to be consumed by additional namespaces.

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

1 files changed, 45 insertions, 3 deletions

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index fa51d751ccf7..3509cff68ef9 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1860,16 +1860,58 @@ static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
         return &nsblk->common.dev;
 }
 
-void nd_region_create_blk_seed(struct nd_region *nd_region)
+static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
+{
+        struct nd_namespace_pmem *nspm;
+        struct resource *res;
+        struct device *dev;
+
+        if (!is_nd_pmem(&nd_region->dev))
+                return NULL;
+
+        nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
+        if (!nspm)
+                return NULL;
+
+        dev = &nspm->nsio.common.dev;
+        dev->type = &namespace_pmem_device_type;
+        dev->parent = &nd_region->dev;
+        res = &nspm->nsio.res;
+        res->name = dev_name(&nd_region->dev);
+        res->flags = IORESOURCE_MEM;
+
+        nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
+        if (nspm->id < 0) {
+                kfree(nspm);
+                return NULL;
+        }
+        dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
+        dev->parent = &nd_region->dev;
+        dev->groups = nd_namespace_attribute_groups;
+        nd_namespace_pmem_set_resource(nd_region, nspm, 0);
+
+        return dev;
+}
+
+void nd_region_create_ns_seed(struct nd_region *nd_region)
 {
         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
-        nd_region->ns_seed = nd_namespace_blk_create(nd_region);
+
+        if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
+                return;
+
+        if (is_nd_blk(&nd_region->dev))
+                nd_region->ns_seed = nd_namespace_blk_create(nd_region);
+        else
+                nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
+
         /*
          * Seed creation failures are not fatal, provisioning is simply
          * disabled until memory becomes available
          */
         if (!nd_region->ns_seed)
-                dev_err(&nd_region->dev, "failed to create blk namespace\n");
+                dev_err(&nd_region->dev, "failed to create %s namespace\n",
+                                is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
         else
                 nd_device_register(nd_region->ns_seed);
 }