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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2015-06-25 10:21:02 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-26 17:23:38 +0200 |
| commit | 047fc8a1f9a6330eacc80374dff087e20dc2304b (patch) | |
| tree | 72ad30740b1770e7c3501d76da55170f05a44a1d /drivers/nvdimm/Kconfig | |
| parent | nd_btt: atomic sector updates (diff) | |
| download | linux-047fc8a1f9a6330eacc80374dff087e20dc2304b.tar.xz linux-047fc8a1f9a6330eacc80374dff087e20dc2304b.zip | |
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/Kconfig')
| -rw-r--r-- | drivers/nvdimm/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig index 204ee0796411..72226acb5c0f 100644 --- a/drivers/nvdimm/Kconfig +++ b/drivers/nvdimm/Kconfig @@ -34,6 +34,19 @@ config BLK_DEV_PMEM Say Y if you want to use an NVDIMM +config ND_BLK + tristate "BLK: Block data window (aperture) device support" + default LIBNVDIMM + select ND_BTT if BTT + help + Support NVDIMMs, or other devices, that implement a BLK-mode + access capability. BLK-mode access uses memory-mapped-i/o + apertures to access persistent media. + + Say Y if your platform firmware emits an ACPI.NFIT table + (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode + capabilities. + config ND_BTT tristate |