14cdadfd5SDan Williams.. SPDX-License-Identifier: GPL-2.0 24cdadfd5SDan Williams.. include:: <isonum.txt> 34cdadfd5SDan Williams 44cdadfd5SDan Williams=================================== 54cdadfd5SDan WilliamsCompute Express Link Memory Devices 64cdadfd5SDan Williams=================================== 74cdadfd5SDan Williams 84cdadfd5SDan WilliamsA Compute Express Link Memory Device is a CXL component that implements the 94cdadfd5SDan WilliamsCXL.mem protocol. It contains some amount of volatile memory, persistent memory, 104cdadfd5SDan Williamsor both. It is enumerated as a PCI device for configuration and passing 114cdadfd5SDan Williamsmessages over an MMIO mailbox. Its contribution to the System Physical 124cdadfd5SDan WilliamsAddress space is handled via HDM (Host Managed Device Memory) decoders 134cdadfd5SDan Williamsthat optionally define a device's contribution to an interleaved address 144cdadfd5SDan Williamsrange across multiple devices underneath a host-bridge or interleaved 154cdadfd5SDan Williamsacross host-bridges. 16*8adaf747SBen Widawsky 17*8adaf747SBen WidawskyDriver Infrastructure 18*8adaf747SBen Widawsky===================== 19*8adaf747SBen Widawsky 20*8adaf747SBen WidawskyThis section covers the driver infrastructure for a CXL memory device. 21*8adaf747SBen Widawsky 22*8adaf747SBen WidawskyCXL Memory Device 23*8adaf747SBen Widawsky----------------- 24*8adaf747SBen Widawsky 25*8adaf747SBen Widawsky.. kernel-doc:: drivers/cxl/mem.c 26*8adaf747SBen Widawsky :doc: cxl mem 27*8adaf747SBen Widawsky 28*8adaf747SBen Widawsky.. kernel-doc:: drivers/cxl/mem.c 29*8adaf747SBen Widawsky :internal: 30