• Dan Williams's avatar
    e820, efi: add ACPI 6.0 persistent memory types · ad5fb870
    Dan Williams authored
    ACPI 6.0 formalizes e820-type-7 and efi-type-14 as persistent memory.
    Mark it "reserved" and allow it to be claimed by a persistent memory
    device driver.
    This definition is in addition to the Linux kernel's existing type-12
    definition that was recently added in support of shipping platforms with
    NVDIMM support that predate ACPI 6.0 (which now classifies type-12 as
    OEM reserved).
    Note, /proc/iomem can be consulted for differentiating legacy
    "Persistent Memory (legacy)" E820_PRAM vs standard "Persistent Memory"
    Cc: Boaz Harrosh <boaz@plexistor.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Jens Axboe <axboe@fb.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Matthew Wilcox <willy@linux.intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Acked-by: default avatarJeff Moyer <jmoyer@redhat.com>
    Acked-by: default avatarAndy Lutomirski <luto@amacapital.net>
    Reviewed-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
    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>
efi.c 8.59 KB