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Block Aperture Window support was an attempt to layer an error model over PMEM for platforms that did not support machine-check-recovery. However, it was abandoned before it ever shipped, and only ever existed in the ACPI specification. Meanwhile Linux has carried a large pile of dead code for non-shipping infrastructure. For years it has been off to the side out of the way, but now CXL and recent directions with DAX support have the potential to collide with this code. In preparation for adding discontiguous namespace support, a pre-requisite for the nvdimm subsystem to replace device-mapper for striping + concatenation use cases, delete BLK aperture support. On the obscure chance that some hardware vendor shipped support for this mode, note that the driver will still keep BLK space reserved in the label area. So an end user in this case would still have the opportunity to report the regression to get BLK-mode support restored without risking the data they have on that device. Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/164688416668.2879318.16903178375774275120.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
118 lines
3.6 KiB
Plaintext
118 lines
3.6 KiB
Plaintext
# 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). 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).
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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
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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_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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or 'sectored' mode.
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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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