drivers/dax/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config DAX_DRIVER
   3         select DAX
   4         bool
   5
   6 menuconfig DAX
   7         tristate "DAX: direct access to differentiated memory"
   8         select SRCU
   9         default m if NVDIMM_DAX
  10
  11 if DAX
  12
  13 config DEV_DAX
  14         tristate "Device DAX: direct access mapping device"
  15         depends on TRANSPARENT_HUGEPAGE
  16         help
  17           Support raw access to differentiated (persistence, bandwidth,
  18           latency...) memory via an mmap(2) capable character
  19           device.  Platform firmware or a device driver may identify a
  20           platform memory resource that is differentiated from the
  21           baseline memory pool.  Mappings of a /dev/daxX.Y device impose
  22           restrictions that make the mapping behavior deterministic.
  23
  24 config DEV_DAX_PMEM
  25         tristate "PMEM DAX: direct access to persistent memory"
  26         depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX
  27         default DEV_DAX
  28         help
  29           Support raw access to persistent memory.  Note that this
  30           driver consumes memory ranges allocated and exported by the
  31           libnvdimm sub-system.
  32
  33           Say M if unsure
  34
  35 config DEV_DAX_KMEM
  36         tristate "KMEM DAX: volatile-use of persistent memory"
  37         default DEV_DAX
  38         depends on DEV_DAX
  39         depends on MEMORY_HOTPLUG # for add_memory() and friends
  40         help
  41           Support access to persistent memory as if it were RAM.  This
  42           allows easier use of persistent memory by unmodified
  43           applications.
  44
  45           To use this feature, a DAX device must be unbound from the
  46           device_dax driver (PMEM DAX) and bound to this kmem driver
  47           on each boot.
  48
  49           Say N if unsure.
  50
  51 config DEV_DAX_PMEM_COMPAT
  52         tristate "PMEM DAX: support the deprecated /sys/class/dax interface"
  53         depends on m && DEV_DAX_PMEM=m
  54         default DEV_DAX_PMEM
  55         help
  56           Older versions of the libdaxctl library expect to find all
  57           device-dax instances under /sys/class/dax. If libdaxctl in
  58           your distribution is older than v58 say M, otherwise say N.
  59
  60 endif