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+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig LIBNVDIMM
+ tristate "NVDIMM (Non-Volatile Memory Device) Support"
+ depends on PHYS_ADDR_T_64BIT
+ depends on HAS_IOMEM
+ depends on BLK_DEV
+ select MEMREGION
+ help
+ Generic support for non-volatile memory devices including
+ ACPI-6-NFIT defined resources. On platforms that define an
+ NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
+ bus is registered to advertise PMEM (persistent memory)
+ namespaces (/dev/pmemX). A PMEM namespace refers to a
+ memory resource that may span multiple DIMMs and support DAX
+ (see CONFIG_DAX).
+
+if LIBNVDIMM
+
+config BLK_DEV_PMEM
+ tristate "PMEM: Persistent memory block device support"
+ default LIBNVDIMM
+ select DAX
+ select ND_BTT if BTT
+ select ND_PFN if NVDIMM_PFN
+ help
+ Memory ranges for PMEM are described by either an NFIT
+ (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
+ non-standard OEM-specific E820 memory type (type-12, see
+ CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
+ 'memmap=nn[KMG]!ss[KMG]' kernel command line (see
+ Documentation/admin-guide/kernel-parameters.rst). This driver converts
+ these persistent memory ranges into block devices that are
+ capable of DAX (direct-access) file system mappings. See
+ Documentation/driver-api/nvdimm/nvdimm.rst for more details.
+
+ Say Y if you want to use an NVDIMM
+
+config ND_CLAIM
+ bool
+
+config ND_BTT
+ tristate
+
+config BTT
+ bool "BTT: Block Translation Table (atomic sector updates)"
+ default y if LIBNVDIMM
+ select ND_CLAIM
+ help
+ The Block Translation Table (BTT) provides atomic sector
+ update semantics for persistent memory devices, so that
+ applications that rely on sector writes not being torn (a
+ guarantee that typical disks provide) can continue to do so.
+ The BTT manifests itself as an alternate personality for an
+ NVDIMM namespace, i.e. a namespace can be in raw mode pmemX,
+ or 'sectored' mode.
+
+ Select Y if unsure
+
+config ND_PFN
+ tristate
+
+config NVDIMM_PFN
+ bool "PFN: Map persistent (device) memory"
+ default LIBNVDIMM
+ depends on ZONE_DEVICE
+ select ND_CLAIM
+ help
+ Map persistent memory, i.e. advertise it to the memory
+ management sub-system. By default persistent memory does
+ not support direct I/O, RDMA, or any other usage that
+ requires a 'struct page' to mediate an I/O request. This
+ driver allocates and initializes the infrastructure needed
+ to support those use cases.
+
+ Select Y if unsure
+
+config NVDIMM_DAX
+ bool "NVDIMM DAX: Raw access to persistent memory"
+ default LIBNVDIMM
+ depends on NVDIMM_PFN
+ help
+ Support raw device dax access to a persistent memory
+ namespace. For environments that want to hard partition
+ persistent memory, this capability provides a mechanism to
+ sub-divide a namespace into character devices that can only be
+ accessed via DAX (mmap(2)).
+
+ Select Y if unsure
+
+config OF_PMEM
+ tristate "Device-tree support for persistent memory regions"
+ depends on OF
+ default LIBNVDIMM
+ help
+ Allows regions of persistent memory to be described in the
+ device-tree.
+
+ Select Y if unsure.
+
+config NVDIMM_KEYS
+ def_bool y
+ depends on ENCRYPTED_KEYS
+ depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m
+
+config NVDIMM_KMSAN
+ bool
+ depends on KMSAN
+ help
+ KMSAN, and other memory debug facilities, increase the size of
+ 'struct page' to contain extra metadata. This collides with
+ the NVDIMM capability to store a potentially
+ larger-than-"System RAM" size 'struct page' array in a
+ reservation of persistent memory rather than limited /
+ precious DRAM. However, that reservation needs to persist for
+ the life of the given NVDIMM namespace. If you are using KMSAN
+ to debug an issue unrelated to NVDIMMs or DAX then say N to this
+ option. Otherwise, say Y but understand that any namespaces
+ (with the page array stored pmem) created with this build of
+ the kernel will permanently reserve and strand excess
+ capacity compared to the CONFIG_KMSAN=n case.
+
+ Select N if unsure.
+
+config NVDIMM_TEST_BUILD
+ tristate "Build the unit test core"
+ depends on m
+ depends on COMPILE_TEST && X86_64
+ default m if COMPILE_TEST
+ help
+ Build the core of the unit test infrastructure. The result of
+ this build is non-functional for unit test execution, but it
+ otherwise helps catch build errors induced by changes to the
+ core devm_memremap_pages() implementation and other
+ infrastructure.
+
+endif