2 tristate "NVDIMM (Non-Volatile Memory Device) Support"
3 depends on PHYS_ADDR_T_64BIT
7 Generic support for non-volatile memory devices including
8 ACPI-6-NFIT defined resources. On platforms that define an
9 NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
10 bus is registered to advertise PMEM (persistent memory)
11 namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
12 namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a
13 memory resource that may span multiple DIMMs and support DAX
14 (see CONFIG_DAX). A BLK namespace refers to an NVDIMM control
15 region which exposes an mmio register set for windowed access
16 mode to non-volatile memory.
21 tristate "PMEM: Persistent memory block device support"
25 select ND_PFN if NVDIMM_PFN
27 Memory ranges for PMEM are described by either an NFIT
28 (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
29 non-standard OEM-specific E820 memory type (type-12, see
30 CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
31 'memmap=nn[KMG]!ss[KMG]' kernel command line (see
32 Documentation/admin-guide/kernel-parameters.rst). This driver converts
33 these persistent memory ranges into block devices that are
34 capable of DAX (direct-access) file system mappings. See
35 Documentation/nvdimm/nvdimm.txt for more details.
37 Say Y if you want to use an NVDIMM
40 tristate "BLK: Block data window (aperture) device support"
44 Support NVDIMMs, or other devices, that implement a BLK-mode
45 access capability. BLK-mode access uses memory-mapped-i/o
46 apertures to access persistent media.
48 Say Y if your platform firmware emits an ACPI.NFIT table
49 (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
59 bool "BTT: Block Translation Table (atomic sector updates)"
60 default y if LIBNVDIMM
63 The Block Translation Table (BTT) provides atomic sector
64 update semantics for persistent memory devices, so that
65 applications that rely on sector writes not being torn (a
66 guarantee that typical disks provide) can continue to do so.
67 The BTT manifests itself as an alternate personality for an
68 NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX,
69 ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys,
78 bool "PFN: Map persistent (device) memory"
80 depends on ZONE_DEVICE
83 Map persistent memory, i.e. advertise it to the memory
84 management sub-system. By default persistent memory does
85 not support direct I/O, RDMA, or any other usage that
86 requires a 'struct page' to mediate an I/O request. This
87 driver allocates and initializes the infrastructure needed
88 to support those use cases.
93 bool "NVDIMM DAX: Raw access to persistent memory"
97 Support raw device dax access to a persistent memory
98 namespace. For environments that want to hard partition
99 peristent memory, this capability provides a mechanism to
100 sub-divide a namespace into character devices that can only be
101 accessed via DAX (mmap(2)).