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authorRoss Zwisler <ross.zwisler@linux.intel.com>2015-06-25 04:21:02 -0400
committerDan Williams <dan.j.williams@intel.com>2015-06-26 11:23:38 -0400
commit047fc8a1f9a6330eacc80374dff087e20dc2304b (patch)
tree72ad30740b1770e7c3501d76da55170f05a44a1d /drivers/nvdimm/nd.h
parent5212e11fde4d40fa627668b4f2222d20db488f71 (diff)
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.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 1b937c235913..f153f43ca3d6 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__ */