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Diffstat (limited to 'drivers/nvdimm/Kconfig')
-rw-r--r-- | drivers/nvdimm/Kconfig | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig new file mode 100644 index 000000000..e4c20f0cb --- /dev/null +++ b/drivers/nvdimm/Kconfig @@ -0,0 +1,136 @@ +# 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 |