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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2015-06-25 04:21:02 -0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-26 11:23:38 -0400 |
| commit | 047fc8a1f9a6330eacc80374dff087e20dc2304b (patch) | |
| tree | 72ad30740b1770e7c3501d76da55170f05a44a1d /drivers/nvdimm/nd.h | |
| parent | 5212e11fde4d40fa627668b4f2222d20db488f71 (diff) | |
| download | linux-0-day-047fc8a1f9a6330eacc80374dff087e20dc2304b.tar.gz linux-0-day-047fc8a1f9a6330eacc80374dff087e20dc2304b.tar.xz | |
libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory
The libnvdimm implementation handles allocating dimm address space (DPA)
between PMEM and BLK mode interfaces. After DPA has been allocated from
a BLK-region to a BLK-namespace the nd_blk driver attaches to handle I/O
as a struct bio based block device. Unlike PMEM, BLK is required to
handle platform specific details like mmio register formats and memory
controller interleave. For this reason the libnvdimm generic nd_blk
driver calls back into the bus provider to carry out the I/O.
This initial implementation handles the BLK interface defined by the
ACPI 6 NFIT [1] and the NVDIMM DSM Interface Example [2] composed from
DCR (dimm control region), BDW (block data window), IDT (interleave
descriptor) NFIT structures and the hardware register format.
[1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
[2]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/nd.h')
| -rw-r--r-- | drivers/nvdimm/nd.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index 1b937c2359131..f153f43ca3d69 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -102,6 +102,15 @@ struct nd_region { struct nd_mapping mapping[0]; }; +struct nd_blk_region { + int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev); + void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev); + int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa, + void *iobuf, u64 len, int rw); + void *blk_provider_data; + struct nd_region nd_region; +}; + /* * Lookup next in the repeating sequence of 01, 10, and 11. */ @@ -171,8 +180,6 @@ static inline struct device *nd_btt_create(struct nd_region *nd_region) #endif struct nd_region *to_nd_region(struct device *dev); -unsigned int nd_region_acquire_lane(struct nd_region *nd_region); -void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane); int nd_region_to_nstype(struct nd_region *nd_region); int nd_region_register_namespaces(struct nd_region *nd_region, int *err); u64 nd_region_interleave_set_cookie(struct nd_region *nd_region); @@ -192,4 +199,6 @@ int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns); int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns); const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, char *name); +int nd_blk_region_init(struct nd_region *nd_region); +resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk); #endif /* __ND_H__ */ |