diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/nd.h | 63 |
1 files changed, 58 insertions, 5 deletions
diff --git a/include/linux/nd.h b/include/linux/nd.h index 23276ea91690..507e47c86737 100644 --- a/include/linux/nd.h +++ b/include/linux/nd.h @@ -12,6 +12,7 @@ */ #ifndef __LINUX_ND_H__ #define __LINUX_ND_H__ +#include <linux/fs.h> #include <linux/ndctl.h> #include <linux/device.h> @@ -29,12 +30,32 @@ static inline struct nd_device_driver *to_nd_device_driver( }; /** + * struct nd_namespace_common - core infrastructure of a namespace + * @force_raw: ignore other personalities for the namespace (e.g. btt) + * @dev: device model node + * @claim: when set a another personality has taken ownership of the namespace + * @rw_bytes: access the raw namespace capacity with byte-aligned transfers + */ +struct nd_namespace_common { + int force_raw; + struct device dev; + struct device *claim; + int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset, + void *buf, size_t size, int rw); +}; + +static inline struct nd_namespace_common *to_ndns(struct device *dev) +{ + return container_of(dev, struct nd_namespace_common, dev); +} + +/** * struct nd_namespace_io - infrastructure for loading an nd_pmem instance * @dev: namespace device created by the nd region driver * @res: struct resource conversion of a NFIT SPA table */ struct nd_namespace_io { - struct device dev; + struct nd_namespace_common common; struct resource res; }; @@ -52,7 +73,6 @@ struct nd_namespace_pmem { /** * struct nd_namespace_blk - namespace for dimm-bounded persistent memory - * @dev: namespace device creation by the nd region driver * @alt_name: namespace name supplied in the dimm label * @uuid: namespace name supplied in the dimm label * @id: ida allocated id @@ -61,7 +81,7 @@ struct nd_namespace_pmem { * @res: discontiguous dpa extents for given dimm */ struct nd_namespace_blk { - struct device dev; + struct nd_namespace_common common; char *alt_name; u8 *uuid; int id; @@ -72,7 +92,7 @@ struct nd_namespace_blk { static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev) { - return container_of(dev, struct nd_namespace_io, dev); + return container_of(dev, struct nd_namespace_io, common.dev); } static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev) @@ -84,7 +104,40 @@ static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev) static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev) { - return container_of(dev, struct nd_namespace_blk, dev); + return container_of(dev, struct nd_namespace_blk, common.dev); +} + +/** + * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace + * @ndns: device to read + * @offset: namespace-relative starting offset + * @buf: buffer to fill + * @size: transfer length + * + * @buf is up-to-date upon return from this routine. + */ +static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns, + resource_size_t offset, void *buf, size_t size) +{ + return ndns->rw_bytes(ndns, offset, buf, size, READ); +} + +/** + * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace + * @ndns: device to read + * @offset: namespace-relative starting offset + * @buf: buffer to drain + * @size: transfer length + * + * NVDIMM Namepaces disks do not implement sectors internally. Depending on + * the @ndns, the contents of @buf may be in cpu cache, platform buffers, + * or on backing memory media upon return from this routine. Flushing + * to media is handled internal to the @ndns driver, if at all. + */ +static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns, + resource_size_t offset, void *buf, size_t size) +{ + return ndns->rw_bytes(ndns, offset, buf, size, WRITE); } #define MODULE_ALIAS_ND_DEVICE(type) \ |
