CONFIG_CXL_MEM: CXL.mem: Memory Devices

General informations

The Linux kernel 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-rc+HEAD
• modules built: cxl_mem

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 (named "cxl_mem.ko" when built as a module) that will attach to CXL.mem devices for configuration, provisioning, and health monitoring. This driver is required for dynamic provisioning of CXL.mem attached memory which is a prerequisite for persistent memory support. Typically volatile memory is mapped by platform firmware and included in the platform memory map, but in some cases the OS is responsible for mapping that memory. See Chapter 2.3 Type 3 CXL Device in the CXL 2.0 specification.

If unsure say 'm'.

Hardware

PCI

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

• class: 05 ("Memory controller"), subclass: 02, prog-if: 10

LKDDb

Raw data from LKDDb:

• lkddb module cxl_mem CONFIG_CXL_MEM : drivers/cxl/Kconfig : "CXL.mem: Memory Devices" # in 5.12-rc+HEAD
• lkddb pci .... .... .... .... 050210 : CONFIG_CXL_BUS CONFIG_CXL_MEM : drivers/cxl/mem.c # in 5.12-rc+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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