Linux 7.4 Preps CXL For Dynamic Capacity Devices

{"heading":"CXL DCD Support in Linux 7.4","subheading":"CXL DCD Support in Linux 7.4","paragraph_1":"The Linux 7.4 kernel update includes support for Dynamic Capacity Devices (DCD) in the Compute Express Link (CXL) subsystem, which allows for dynamic memory scaling without needing to reboot the hardware.","paragraph_2":"DCD is Type-3 CXL memory expansion hardware that enables the server memory capacity to scale dynamically, either up or down, without the need for a reboot or physical reconfiguration.","paragraph_3":"The update includes changes to the CXL infrastructure, such as flagging DCD support in the mailbox, reading the dynamic capacity configuration from the device, and configuring the dynamic capacity interrupts.","paragraph_4":"The changes also include a documentation update and a cleanup that enforces partition ordering, but DCD is not yet enabled with these code changes.","paragraph_5":"The pull request for the merged CXL changes for Linux 7.4 can be found here. The updates are part of a larger effort to reduce the burden of very large patch sets for review."}