drivers/nvdimm/Kconfig

   1 menuconfig LIBNVDIMM
   2         tristate "NVDIMM (Non-Volatile Memory Device) Support"
   3         depends on PHYS_ADDR_T_64BIT
   4         depends on BLK_DEV
   5         help
   6           Generic support for non-volatile memory devices including
   7           ACPI-6-NFIT defined resources.  On platforms that define an
   8           NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
   9           bus is registered to advertise PMEM (persistent memory)
  10           namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
  11           namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a
  12           memory resource that may span multiple DIMMs and support DAX
  13           (see CONFIG_DAX).  A BLK namespace refers to an NVDIMM control
  14           region which exposes an mmio register set for windowed access
  15           mode to non-volatile memory.
  16
  17 if LIBNVDIMM
  18
  19 config BLK_DEV_PMEM
  20         tristate "PMEM: Persistent memory block device support"
  21         default LIBNVDIMM
  22         depends on HAS_IOMEM
  23         select ND_BTT if BTT
  24         help
  25           Memory ranges for PMEM are described by either an NFIT
  26           (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
  27           non-standard OEM-specific E820 memory type (type-12, see
  28           CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
  29           'memmap=nn[KMG]!ss[KMG]' kernel command line (see
  30           Documentation/kernel-parameters.txt).  This driver converts
  31           these persistent memory ranges into block devices that are
  32           capable of DAX (direct-access) file system mappings.  See
  33           Documentation/nvdimm/nvdimm.txt for more details.
  34
  35           Say Y if you want to use an NVDIMM
  36
  37 config ND_BTT
  38         tristate
  39
  40 config BTT
  41         bool "BTT: Block Translation Table (atomic sector updates)"
  42         default y if LIBNVDIMM
  43         help
  44           The Block Translation Table (BTT) provides atomic sector
  45           update semantics for persistent memory devices, so that
  46           applications that rely on sector writes not being torn (a
  47           guarantee that typical disks provide) can continue to do so.
  48           The BTT manifests itself as an alternate personality for an
  49           NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX,
  50           ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys,
  51           etc...).
  52
  53           Select Y if unsure
  54
  55 endif