1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "NVDIMM (Non-Volatile Memory Device) Support"
4 depends on PHYS_ADDR_T_64BIT
9 Generic support for non-volatile memory devices including
10 ACPI-6-NFIT defined resources. On platforms that define an
11 NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
12 bus is registered to advertise PMEM (persistent memory)
13 namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
14 namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a
15 memory resource that may span multiple DIMMs and support DAX
16 (see CONFIG_DAX). A BLK namespace refers to an NVDIMM control
17 region which exposes an mmio register set for windowed access
18 mode to non-volatile memory.
23 tristate "PMEM: Persistent memory block device support"
27 select ND_PFN if NVDIMM_PFN
29 Memory ranges for PMEM are described by either an NFIT
30 (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
31 non-standard OEM-specific E820 memory type (type-12, see
32 CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
33 'memmap=nn[KMG]!ss[KMG]' kernel command line (see
34 Documentation/admin-guide/kernel-parameters.rst). This driver converts
35 these persistent memory ranges into block devices that are
36 capable of DAX (direct-access) file system mappings. See
37 Documentation/driver-api/nvdimm/nvdimm.rst for more details.
39 Say Y if you want to use an NVDIMM
42 tristate "BLK: Block data window (aperture) device support"
46 Support NVDIMMs, or other devices, that implement a BLK-mode
47 access capability. BLK-mode access uses memory-mapped-i/o
48 apertures to access persistent media.
50 Say Y if your platform firmware emits an ACPI.NFIT table
51 (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
61 bool "BTT: Block Translation Table (atomic sector updates)"
62 default y if LIBNVDIMM
65 The Block Translation Table (BTT) provides atomic sector
66 update semantics for persistent memory devices, so that
67 applications that rely on sector writes not being torn (a
68 guarantee that typical disks provide) can continue to do so.
69 The BTT manifests itself as an alternate personality for an
70 NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX,
71 ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys,
80 bool "PFN: Map persistent (device) memory"
82 depends on ZONE_DEVICE
85 Map persistent memory, i.e. advertise it to the memory
86 management sub-system. By default persistent memory does
87 not support direct I/O, RDMA, or any other usage that
88 requires a 'struct page' to mediate an I/O request. This
89 driver allocates and initializes the infrastructure needed
90 to support those use cases.
95 bool "NVDIMM DAX: Raw access to persistent memory"
99 Support raw device dax access to a persistent memory
100 namespace. For environments that want to hard partition
101 persistent memory, this capability provides a mechanism to
102 sub-divide a namespace into character devices that can only be
103 accessed via DAX (mmap(2)).
108 tristate "Device-tree support for persistent memory regions"
112 Allows regions of persistent memory to be described in the
119 depends on ENCRYPTED_KEYS
120 depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m
122 config NVDIMM_TEST_BUILD
123 tristate "Build the unit test core"
125 depends on COMPILE_TEST && X86_64
126 default m if COMPILE_TEST
128 Build the core of the unit test infrastructure. The result of
129 this build is non-functional for unit test execution, but it
130 otherwise helps catch build errors induced by changes to the
131 core devm_memremap_pages() implementation and other