[linux-block.git] / drivers / cxl / Kconfig

# SPDX-License-Identifier: GPL-2.0-only
menuconfig CXL_BUS
	tristate "CXL (Compute Express Link) Devices Support"
	depends on PCI
	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_MEM
	tristate "CXL.mem: Memory Devices"
	help
	  The CXL.mem protocol allows a device to act as a provider of
	  "System RAM" and/or "Persistent Memory" that is fully coherent
	  as if the memory was attached to the typical CPU memory
	  controller.

	  Say 'y/m' to enable a driver that will attach to CXL.mem devices 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_MEM
	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.
endif
Commit	Line	Data
4cdadfd5 DW	1	# SPDX-License-Identifier: GPL-2.0-only
	2	menuconfig CXL_BUS
	3	tristate "CXL (Compute Express Link) Devices Support"
	4	depends on PCI
	5	help
	6	CXL is a bus that is electrically compatible with PCI Express, but
	7	layers three protocols on that signalling (CXL.io, CXL.cache, and
	8	CXL.mem). The CXL.cache protocol allows devices to hold cachelines
	9	locally, the CXL.mem protocol allows devices to be fully coherent
	10	memory targets, the CXL.io protocol is equivalent to PCI Express.
	11	Say 'y' to enable support for the configuration and management of
	12	devices supporting these protocols.
	13
	14	if CXL_BUS
	15
	16	config CXL_MEM
	17	tristate "CXL.mem: Memory Devices"
	18	help
	19	The CXL.mem protocol allows a device to act as a provider of
	20	"System RAM" and/or "Persistent Memory" that is fully coherent
	21	as if the memory was attached to the typical CPU memory
	22	controller.
	23
21e9f767 BW	24	Say 'y/m' to enable a driver that will attach to CXL.mem devices for
	25	configuration and management primarily via the mailbox interface. See
	26	Chapter 2.3 Type 3 CXL Device in the CXL 2.0 specification for more
	27	details.
4cdadfd5 DW	28
4cdadfd5 DW	29	If unsure say 'm'.
13237183 BW	30
	31	config CXL_MEM_RAW_COMMANDS
	32	bool "RAW Command Interface for Memory Devices"
	33	depends on CXL_MEM
	34	help
	35	Enable CXL RAW command interface.
	36
	37	The CXL driver ioctl interface may assign a kernel ioctl command
	38	number for each specification defined opcode. At any given point in
	39	time the number of opcodes that the specification defines and a device
	40	may implement may exceed the kernel's set of associated ioctl function
	41	numbers. The mismatch is either by omission, specification is too new,
	42	or by design. When prototyping new hardware, or developing / debugging
	43	the driver it is useful to be able to submit any possible command to
	44	the hardware, even commands that may crash the kernel due to their
	45	potential impact to memory currently in use by the kernel.
	46
	47	If developing CXL hardware or the driver say Y, otherwise say N.
4cdadfd5	48	endif