linux-imx

config DAX_DRIVER

    select DAX

    bool

​

menuconfig DAX

    tristate "DAX: direct access to differentiated memory"

    select SRCU

    default m if NVDIMM_DAX

​

if DAX

​

config DEV_DAX

    tristate "Device DAX: direct access mapping device"

    depends on TRANSPARENT_HUGEPAGE

    help

      Support raw access to differentiated (persistence, bandwidth,

      latency...) memory via an mmap(2) capable character

      device.  Platform firmware or a device driver may identify a

      platform memory resource that is differentiated from the

      baseline memory pool.  Mappings of a /dev/daxX.Y device impose

      restrictions that make the mapping behavior deterministic.

​

config DEV_DAX_PMEM

    tristate "PMEM DAX: direct access to persistent memory"

    depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX

    depends on m # until we can kill DEV_DAX_PMEM_COMPAT

    default DEV_DAX

    help

      Support raw access to persistent memory.  Note that this

      driver consumes memory ranges allocated and exported by the

      libnvdimm sub-system.

​

      Say M if unsure

​

config DEV_DAX_KMEM

    tristate "KMEM DAX: volatile-use of persistent memory"

    default DEV_DAX

    depends on DEV_DAX

    depends on MEMORY_HOTPLUG # for add_memory() and friends

    help

      Support access to persistent memory as if it were RAM.  This

      allows easier use of persistent memory by unmodified

      applications.

​

      To use this feature, a DAX device must be unbound from the

      device_dax driver (PMEM DAX) and bound to this kmem driver

      on each boot.

​

      Say N if unsure.

​

config DEV_DAX_PMEM_COMPAT

    tristate "PMEM DAX: support the deprecated /sys/class/dax interface"

    depends on DEV_DAX_PMEM

    default DEV_DAX_PMEM

    help

      Older versions of the libdaxctl library expect to find all

      device-dax instances under /sys/class/dax. If libdaxctl in

      your distribution is older than v58 say M, otherwise say N.

​

endif