libnvdimm, dax: introduce device-dax infrastructure
Device DAX is the device-centric analogue of Filesystem DAX
(CONFIG_FS_DAX). It allows persistent memory ranges to be allocated and
mapped without need of an intervening file system. This initial
infrastructure arranges for a libnvdimm pfn-device to be represented as
a different device-type so that it can be attached to a driver other
than the pmem driver.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 6c36509..46910b8 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -101,10 +101,12 @@
struct ida ns_ida;
struct ida btt_ida;
struct ida pfn_ida;
+ struct ida dax_ida;
unsigned long flags;
struct device *ns_seed;
struct device *btt_seed;
struct device *pfn_seed;
+ struct device *dax_seed;
u16 ndr_mappings;
u64 ndr_size;
u64 ndr_start;
@@ -161,6 +163,10 @@
struct nd_namespace_common *ndns;
};
+struct nd_dax {
+ struct nd_pfn nd_pfn;
+};
+
enum nd_async_mode {
ND_SYNC,
ND_ASYNC,
@@ -224,7 +230,10 @@
int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
bool is_nd_pfn(struct device *dev);
struct device *nd_pfn_create(struct nd_region *nd_region);
+struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
+ struct nd_namespace_common *ndns);
int nd_pfn_validate(struct nd_pfn *nd_pfn);
+extern struct attribute_group nd_pfn_attribute_group;
#else
static inline int nd_pfn_probe(struct device *dev,
struct nd_namespace_common *ndns)
@@ -248,6 +257,22 @@
}
#endif
+struct nd_dax *to_nd_dax(struct device *dev);
+#if IS_ENABLED(CONFIG_NVDIMM_DAX)
+bool is_nd_dax(struct device *dev);
+struct device *nd_dax_create(struct nd_region *nd_region);
+#else
+static inline bool is_nd_dax(struct device *dev)
+{
+ return false;
+}
+
+static inline struct device *nd_dax_create(struct nd_region *nd_region)
+{
+ return NULL;
+}
+#endif
+
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);