linux-imx

menuconfig LIBNVDIMM

    tristate "NVDIMM (Non-Volatile Memory Device) Support"

    depends on PHYS_ADDR_T_64BIT

    depends on HAS_IOMEM

    depends on BLK_DEV

    help

      Generic support for non-volatile memory devices including

      ACPI-6-NFIT defined resources.  On platforms that define an

      NFIT, or otherwise can discover NVDIMM resources, a libnvdimm

      bus is registered to advertise PMEM (persistent memory)

      namespaces (/dev/pmemX) and BLK (sliding mmio window(s))

      namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a

      memory resource that may span multiple DIMMs and support DAX

      (see CONFIG_DAX).  A BLK namespace refers to an NVDIMM control

      region which exposes an mmio register set for windowed access

      mode to non-volatile memory.

​

if LIBNVDIMM

​

config BLK_DEV_PMEM

    tristate "PMEM: Persistent memory block device support"

    default LIBNVDIMM

    select DAX_DRIVER

    select ND_BTT if BTT

    select ND_PFN if NVDIMM_PFN

    help

      Memory ranges for PMEM are described by either an NFIT

      (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a

      non-standard OEM-specific E820 memory type (type-12, see

      CONFIG_X86_PMEM_LEGACY), or it is manually specified by the

      'memmap=nn[KMG]!ss[KMG]' kernel command line (see

      Documentation/admin-guide/kernel-parameters.rst).  This driver converts

      these persistent memory ranges into block devices that are

      capable of DAX (direct-access) file system mappings.  See

      Documentation/nvdimm/nvdimm.txt for more details.

​

      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_CLAIM

    bool

​

config ND_BTT

    tristate

​

config BTT

    bool "BTT: Block Translation Table (atomic sector updates)"

    default y if LIBNVDIMM

    select ND_CLAIM

    help

      The Block Translation Table (BTT) provides atomic sector