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libnvdimm: support for legacy (non-aliasing) nvdimms

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The libnvdimm region driver is an intermediary driver that translates
non-volatile "region"s into "namespace" sub-devices that are surfaced by
persistent memory block-device drivers (PMEM and BLK).

ACPI 6 introduces the concept that a given nvdimm may simultaneously
offer multiple access modes to its media through direct PMEM load/store
access, or windowed BLK mode.  Existing nvdimms mostly implement a PMEM
interface, some offer a BLK-like mode, but never both as ACPI 6 defines.
If an nvdimm is single interfaced, then there is no need for dimm
metadata labels.  For these devices we can take the region boundaries
directly to create a child namespace device (nd_namespace_io).

Acked-by: Christoph Hellwig <[email protected]>
Tested-by: Toshi Kani <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2015-05-31 15:02:11 -04:00
commit 3d88002e4a
13 changed files with 383 additions and 8 deletions
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1
drivers/acpi/nfit.c
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@ -780,6 +780,7 @@ static struct attribute_group acpi_nfit_region_attribute_group = {
static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
&nd_region_attribute_group,
&nd_mapping_attribute_group,
&nd_device_attribute_group,
&acpi_nfit_region_attribute_group,
NULL,
};