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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/region.c | |
| parent | nd_btt: atomic sector updates (diff) | |
| download | linux-dev-047fc8a1f9a6330eacc80374dff087e20dc2304b.tar.xz linux-dev-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/region.c')
| -rw-r--r-- | drivers/nvdimm/region.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c index eb8aebcd4800..f28f78ccff19 100644 --- a/drivers/nvdimm/region.c +++ b/drivers/nvdimm/region.c @@ -18,11 +18,10 @@ static int nd_region_probe(struct device *dev) { - int err; + int err, rc; static unsigned long once; struct nd_region_namespaces *num_ns; struct nd_region *nd_region = to_nd_region(dev); - int rc = nd_region_register_namespaces(nd_region, &err); if (nd_region->num_lanes > num_online_cpus() && nd_region->num_lanes < num_possible_cpus() @@ -34,6 +33,11 @@ static int nd_region_probe(struct device *dev) nd_region->num_lanes); } + rc = nd_blk_region_init(nd_region); + if (rc) + return rc; + + rc = nd_region_register_namespaces(nd_region, &err); num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL); if (!num_ns) return -ENOMEM; |