# SPDX-License-Identifier: GPL-2.0-only
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menuconfig LIBNVDIMM
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tristate "NVDIMM (Non-Volatile Memory Device) Support"
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depends on PHYS_ADDR_T_64BIT
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depends on HAS_IOMEM
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depends on BLK_DEV
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select MEMREGION
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help
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Generic support for non-volatile memory devices including
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ACPI-6-NFIT defined resources. On platforms that define an
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NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
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bus is registered to advertise PMEM (persistent memory)
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namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
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namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a
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memory resource that may span multiple DIMMs and support DAX
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(see CONFIG_DAX). A BLK namespace refers to an NVDIMM control
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region which exposes an mmio register set for windowed access
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mode to non-volatile memory.
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if LIBNVDIMM
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config BLK_DEV_PMEM
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tristate "PMEM: Persistent memory block device support"
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default LIBNVDIMM
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select DAX_DRIVER
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select ND_BTT if BTT
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select ND_PFN if NVDIMM_PFN
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help
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Memory ranges for PMEM are described by either an NFIT
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(NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
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non-standard OEM-specific E820 memory type (type-12, see
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CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
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'memmap=nn[KMG]!ss[KMG]' kernel command line (see
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Documentation/admin-guide/kernel-parameters.rst). This driver converts
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these persistent memory ranges into block devices that are
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capable of DAX (direct-access) file system mappings. See
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Documentation/driver-api/nvdimm/nvdimm.rst for more details.
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Say Y if you want to use an NVDIMM
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config ND_BLK
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tristate "BLK: Block data window (aperture) device support"
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default LIBNVDIMM
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select ND_BTT if BTT
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help
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Support NVDIMMs, or other devices, that implement a BLK-mode
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access capability. BLK-mode access uses memory-mapped-i/o
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apertures to access persistent media.
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Say Y if your platform firmware emits an ACPI.NFIT table
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(CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
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capabilities.
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config ND_CLAIM
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bool
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config ND_BTT
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tristate
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config BTT
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bool "BTT: Block Translation Table (atomic sector updates)"
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default y if LIBNVDIMM
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select ND_CLAIM
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help
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The Block Translation Table (BTT) provides atomic sector
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update semantics for persistent memory devices, so that
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applications that rely on sector writes not being torn (a
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guarantee that typical disks provide) can continue to do so.
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The BTT manifests itself as an alternate personality for an
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NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX,
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ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys,
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etc...).
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Select Y if unsure
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config ND_PFN
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tristate
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config NVDIMM_PFN
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bool "PFN: Map persistent (device) memory"
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default LIBNVDIMM
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depends on ZONE_DEVICE
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select ND_CLAIM
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help
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Map persistent memory, i.e. advertise it to the memory
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management sub-system. By default persistent memory does
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not support direct I/O, RDMA, or any other usage that
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requires a 'struct page' to mediate an I/O request. This
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driver allocates and initializes the infrastructure needed
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to support those use cases.
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Select Y if unsure
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config NVDIMM_DAX
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bool "NVDIMM DAX: Raw access to persistent memory"
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default LIBNVDIMM
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depends on NVDIMM_PFN
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help
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Support raw device dax access to a persistent memory
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namespace. For environments that want to hard partition
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persistent memory, this capability provides a mechanism to
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sub-divide a namespace into character devices that can only be
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accessed via DAX (mmap(2)).
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Select Y if unsure
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config OF_PMEM
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tristate "Device-tree support for persistent memory regions"
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depends on OF
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default LIBNVDIMM
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help
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Allows regions of persistent memory to be described in the
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device-tree.
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Select Y if unsure.
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config NVDIMM_KEYS
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def_bool y
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depends on ENCRYPTED_KEYS
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depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m
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config NVDIMM_TEST_BUILD
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tristate "Build the unit test core"
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depends on m
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depends on COMPILE_TEST && X86_64
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default m if COMPILE_TEST
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help
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Build the core of the unit test infrastructure. The result of
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this build is non-functional for unit test execution, but it
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otherwise helps catch build errors induced by changes to the
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core devm_memremap_pages() implementation and other
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infrastructure.
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endif
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