drivers/cxl/Kconfig

Source file repositories/reference/linux-study-clean/drivers/cxl/Kconfig

File Facts

System
Linux kernel
Corpus path
drivers/cxl/Kconfig
Extension
[no extension]
Size
8774 bytes
Lines
247
Domain
Driver Families
Bucket
drivers/cxl
Inferred role
Driver Families: build/configuration rule
Status
atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0-only
menuconfig CXL_BUS
	tristate "CXL (Compute Express Link) Devices Support"
	depends on PCI
	select FW_LOADER
	select FW_UPLOAD
	select PCI_DOE
	select FIRMWARE_TABLE
	select NUMA_KEEP_MEMINFO if NUMA_MEMBLKS
	select FWCTL if CXL_FEATURES
	help
	  CXL is a bus that is electrically compatible with PCI Express, but
	  layers three protocols on that signalling (CXL.io, CXL.cache, and
	  CXL.mem). The CXL.cache protocol allows devices to hold cachelines
	  locally, the CXL.mem protocol allows devices to be fully coherent
	  memory targets, the CXL.io protocol is equivalent to PCI Express.
	  Say 'y' to enable support for the configuration and management of
	  devices supporting these protocols.

if CXL_BUS

config CXL_PCI
	tristate "PCI manageability"
	default CXL_BUS
	select CXL_MEM
	help
	  The CXL specification defines a "CXL memory device" sub-class in the
	  PCI "memory controller" base class of devices. Device's identified by
	  this class code provide support for volatile and / or persistent
	  memory to be mapped into the system address map (Host-managed Device
	  Memory (HDM)).

	  Say 'y/m' to enable a driver that will attach to CXL memory expander
	  devices enumerated by the memory device class code for configuration
	  and management primarily via the mailbox interface. See Chapter 2.3
	  Type 3 CXL Device in the CXL 2.0 specification for more details.

	  If unsure say 'm'.

config CXL_MEM_RAW_COMMANDS
	bool "RAW Command Interface for Memory Devices"
	depends on CXL_PCI
	help
	  Enable CXL RAW command interface.

	  The CXL driver ioctl interface may assign a kernel ioctl command
	  number for each specification defined opcode. At any given point in
	  time the number of opcodes that the specification defines and a device
	  may implement may exceed the kernel's set of associated ioctl function
	  numbers. The mismatch is either by omission, specification is too new,
	  or by design. When prototyping new hardware, or developing / debugging
	  the driver it is useful to be able to submit any possible command to
	  the hardware, even commands that may crash the kernel due to their
	  potential impact to memory currently in use by the kernel.

	  If developing CXL hardware or the driver say Y, otherwise say N.

config CXL_ACPI
	tristate "CXL ACPI: Platform Support"
	depends on ACPI
	depends on ACPI_NUMA
	depends on CXL_PMEM || !CXL_PMEM
	default CXL_BUS
	select ACPI_TABLE_LIB
	select ACPI_HMAT
	select CXL_PORT
	help
	  Enable support for host managed device memory (HDM) resources
	  published by a platform's ACPI CXL memory layout description.  See
	  Chapter 9.14.1 CXL Early Discovery Table (CEDT) in the CXL 2.0

Annotation

Implementation Notes