• Dan Williams's avatar
    libnvdimm: support for legacy (non-aliasing) nvdimms · 3d88002e
    Dan Williams authored
    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: default avatarChristoph Hellwig <hch@lst.de>
    Tested-by: default avatarToshi Kani <toshi.kani@hp.com>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>