libnvdimm: convert NDD_ flags to use bitops, introduce NDD_LOCKED

This is a preparation patch for handling locked nvdimm label regions, a
new concept as introduced by the latest DSM document on pmem.io [1]. A
future patch will leverage nvdimm_set_locked() at DIMM probe time to
flag regions that can not be enabled. There should be no functional
difference resulting from this change.

[1]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example-V1.3.pdf

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

5 files changed, 15 insertions, 7 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index ced95a79c1a1..a26c2297c1ed 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1512,7 +1512,7 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
                 }
 
                 if (nfit_mem->bdw && nfit_mem->memdev_pmem)
-                        flags |= NDD_ALIASING;
+                        set_bit(NDD_ALIASING, &flags);
 
                 /* collate flags across all memdevs for this dimm */
                 list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
@@ -1527,7 +1527,7 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
 
                 mem_flags = __to_nfit_memdev(nfit_mem)->flags;
                 if (mem_flags & ACPI_NFIT_MEM_NOT_ARMED)
-                        flags |= NDD_UNARMED;
+                        set_bit(NDD_UNARMED, &flags);
 
                 rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle);
                 if (rc)
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 8b721321be5b..7d1a3dbc7d5d 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -34,7 +34,7 @@ int nvdimm_check_config_data(struct device *dev)
 
         if (!nvdimm->cmd_mask ||
             !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
-                if (nvdimm->flags & NDD_ALIASING)
+                if (test_bit(NDD_ALIASING, &nvdimm->flags))
                         return -ENXIO;
                 else
                         return -ENOTTY;
@@ -188,7 +188,14 @@ void nvdimm_set_aliasing(struct device *dev)
 {
         struct nvdimm *nvdimm = to_nvdimm(dev);
 
-        nvdimm->flags |= NDD_ALIASING;
+        set_bit(NDD_ALIASING, &nvdimm->flags);
+}
+
+void nvdimm_set_locked(struct device *dev)
+{
+        struct nvdimm *nvdimm = to_nvdimm(dev);
+
+        set_bit(NDD_LOCKED, &nvdimm->flags);
 }
 
 static void nvdimm_release(struct device *dev)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 1b481a5fb966..2f2d8afc684a 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -2240,7 +2240,7 @@ static int init_active_labels(struct nd_region *nd_region)
                  * being activated if it aliases DPA.
                  */
                 if (!ndd) {
-                        if ((nvdimm->flags & NDD_ALIASING) == 0)
+                        if (!test_bit(NDD_ALIASING, &nvdimm->flags))
                                 return 0;
                         dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
                                         dev_name(&nd_mapping->nvdimm->dev));
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index c3b33cf655fb..77d032192bf7 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -240,6 +240,7 @@ int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
                 unsigned int len);
 void nvdimm_set_aliasing(struct device *dev);
+void nvdimm_set_locked(struct device *dev);
 struct nd_btt *to_nd_btt(struct device *dev);
 
 struct nd_gen_sb {
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 07756b2e1cd5..b550edf2571f 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -222,7 +222,7 @@ int nd_region_to_nstype(struct nd_region *nd_region)
                         struct nd_mapping *nd_mapping = &nd_region->mapping[i];
                         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 
-                        if (nvdimm->flags & NDD_ALIASING)
+                        if (test_bit(NDD_ALIASING, &nvdimm->flags))
                                 alias++;
                 }
                 if (alias)
@@ -881,7 +881,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
                         return NULL;
                 }
 
-                if (nvdimm->flags & NDD_UNARMED)
+                if (test_bit(NDD_UNARMED, &nvdimm->flags))
                         ro = 1;
         }