CONFIG_CXL_MEM: CXL: Memory Expansion

General informations

The Linux kernel configuration item CONFIG_CXL_MEM has multiple definitions:

CXL: Memory Expansion found in drivers/cxl/Kconfig

The configuration item CONFIG_CXL_MEM:

• prompt: CXL: Memory Expansion
• type: tristate
• depends on: CONFIG_CXL_PCI
• defined in drivers/cxl/Kconfig
• found in Linux kernels: 5.18
• modules built: cxl_mem, cxl_pci

Help text

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 were attached to the typical CPU memory controller. This is known as HDM "Host-managed Device Memory".

Say 'y/m' to enable a driver that will attach to CXL.mem devices for memory expansion and control of HDM. See Chapter 9.13 in the CXL 2.0 specification for a detailed description of HDM.

If unsure say 'm'.

CXL.mem: Memory Devices found in drivers/cxl/Kconfig

The configuration item CONFIG_CXL_MEM:

• prompt: CXL.mem: Memory Devices
• type: tristate
• depends on: (none)
• defined in drivers/cxl/Kconfig
• found in Linux kernels: 5.12–5.17, 5.17+HEAD
• modules built: cxl_mem, cxl_pci

Help text

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'.

Hardware

PCI

Numeric ID (from LKDDb) and names (from pci.ids) of recognized devices:

• class: 05 ("Memory controller"), subclass: 02 ("CXL"), prog-if: 10 ("CXL Memory Device (CXL 2.x)")
• class: 05 ("Memory controller"), subclass: 02 ("CXL"), prog-if: 10 ("CXL Memory Device (CXL 2.x)")

LKDDb

Raw data from LKDDb:

• lkddb module cxl_mem CONFIG_CXL_MEM : drivers/cxl/Kconfig : "CXL: Memory Expansion" # in 5.12–5.13, 5.18
• lkddb module cxl_pci CONFIG_CXL_MEM : drivers/cxl/Kconfig : "CXL.mem: Memory Devices" # in 5.14–5.17, 5.17+HEAD
• lkddb pci .... .... .... .... 050210 : CONFIG_CXL_BUS CONFIG_CXL_MEM : drivers/cxl/mem.c # in 5.12–5.13
• lkddb pci .... .... .... .... 050210 : CONFIG_CXL_BUS CONFIG_CXL_MEM : drivers/cxl/pci.c # in 5.14–5.17, 5.17+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)
• The Linux PCI ID Repository.

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