2 tristate "NVDIMM (Non-Volatile Memory Device) Support"
3 depends on PHYS_ADDR_T_64BIT
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.
20 tristate "PMEM: Persistent memory block device support"
24 select ND_PFN if NVDIMM_PFN
26 Memory ranges for PMEM are described by either an NFIT
27 (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
28 non-standard OEM-specific E820 memory type (type-12, see
29 CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
30 'memmap=nn[KMG]!ss[KMG]' kernel command line (see
31 Documentation/kernel-parameters.txt). This driver converts
32 these persistent memory ranges into block devices that are
33 capable of DAX (direct-access) file system mappings. See
34 Documentation/nvdimm/nvdimm.txt for more details.
36 Say Y if you want to use an NVDIMM
39 tristate "BLK: Block data window (aperture) device support"
43 Support NVDIMMs, or other devices, that implement a BLK-mode
44 access capability. BLK-mode access uses memory-mapped-i/o
45 apertures to access persistent media.
47 Say Y if your platform firmware emits an ACPI.NFIT table
48 (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
58 bool "BTT: Block Translation Table (atomic sector updates)"
59 default y if LIBNVDIMM
62 The Block Translation Table (BTT) provides atomic sector
63 update semantics for persistent memory devices, so that
64 applications that rely on sector writes not being torn (a
65 guarantee that typical disks provide) can continue to do so.
66 The BTT manifests itself as an alternate personality for an
67 NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX,
68 ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys,
77 bool "PFN: Map persistent (device) memory"
79 depends on ZONE_DEVICE
82 Map persistent memory, i.e. advertise it to the memory
83 management sub-system. By default persistent memory does
84 not support direct I/O, RDMA, or any other usage that
85 requires a 'struct page' to mediate an I/O request. This
86 driver allocates and initializes the infrastructure needed
87 to support those use cases.
92 bool "NVDIMM DAX: Raw access to persistent memory"
96 Support raw device dax access to a persistent memory
97 namespace. For environments that want to hard partition
98 peristent memory, this capability provides a mechanism to
99 sub-divide a namespace into character devices that can only be
100 accessed via DAX (mmap(2)).