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79 lines
3.0 KiB
Plaintext
79 lines
3.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menuconfig CXL_BUS
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tristate "CXL (Compute Express Link) Devices Support"
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depends on PCI
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help
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CXL is a bus that is electrically compatible with PCI Express, but
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layers three protocols on that signalling (CXL.io, CXL.cache, and
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CXL.mem). The CXL.cache protocol allows devices to hold cachelines
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locally, the CXL.mem protocol allows devices to be fully coherent
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memory targets, the CXL.io protocol is equivalent to PCI Express.
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Say 'y' to enable support for the configuration and management of
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devices supporting these protocols.
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if CXL_BUS
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config CXL_MEM
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tristate "CXL.mem: Memory Devices"
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default CXL_BUS
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help
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The CXL.mem protocol allows a device to act as a provider of
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"System RAM" and/or "Persistent Memory" that is fully coherent
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as if the memory was attached to the typical CPU memory
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controller.
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Say 'y/m' to enable a driver that will attach to CXL.mem devices for
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configuration and management primarily via the mailbox interface. See
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Chapter 2.3 Type 3 CXL Device in the CXL 2.0 specification for more
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details.
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If unsure say 'm'.
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config CXL_MEM_RAW_COMMANDS
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bool "RAW Command Interface for Memory Devices"
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depends on CXL_MEM
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help
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Enable CXL RAW command interface.
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The CXL driver ioctl interface may assign a kernel ioctl command
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number for each specification defined opcode. At any given point in
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time the number of opcodes that the specification defines and a device
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may implement may exceed the kernel's set of associated ioctl function
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numbers. The mismatch is either by omission, specification is too new,
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or by design. When prototyping new hardware, or developing / debugging
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the driver it is useful to be able to submit any possible command to
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the hardware, even commands that may crash the kernel due to their
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potential impact to memory currently in use by the kernel.
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If developing CXL hardware or the driver say Y, otherwise say N.
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config CXL_ACPI
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tristate "CXL ACPI: Platform Support"
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depends on ACPI
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default CXL_BUS
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help
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Enable support for host managed device memory (HDM) resources
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published by a platform's ACPI CXL memory layout description. See
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Chapter 9.14.1 CXL Early Discovery Table (CEDT) in the CXL 2.0
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specification, and CXL Fixed Memory Window Structures (CEDT.CFMWS)
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(https://www.computeexpresslink.org/spec-landing). The CXL core
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consumes these resource to publish the root of a cxl_port decode
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hierarchy to map regions that represent System RAM, or Persistent
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Memory regions to be managed by LIBNVDIMM.
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If unsure say 'm'.
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config CXL_PMEM
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tristate "CXL PMEM: Persistent Memory Support"
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depends on LIBNVDIMM
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default CXL_BUS
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help
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In addition to typical memory resources a platform may also advertise
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support for persistent memory attached via CXL. This support is
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managed via a bridge driver from CXL to the LIBNVDIMM system
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subsystem. Say 'y/m' to enable support for enumerating and
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provisioning the persistent memory capacity of CXL memory expanders.
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If unsure say 'm'.
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endif
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