CXL MEM(9)

💖 cxl mem(9) — Kernel API Manual 💖

okay so this is the cxl mem page, bestie, and it's lowkey iconic. Grab a snack, we're doing kernel API theory but make it cute. 🍓

CXL memory endpoint devices and switches are CXL capable devices that are participating in the CXL.mem protocol. Their functionality builds on top of the CXL.io protocol, which allows enumerating and configuring components via standard PCI mechanisms. It's giving "serious hardware business" and honestly? Obsessed. 💅

The cxl_mem driver owns kicking off the enumeration of this CXL.mem capability. With the detection of a CXL capable endpoint, the driver will walk up to find the platform specific port it is connected to, and determine if there are intervening switches in the path. If there are switches, a secondary action is to enumerate those (implemented in cxl_core). Finally, the cxl_mem driver adds the device it is bound to as a CXL endpoint-port for use in higher level operations. Main character driver behavior, fr fr. 👑

🌈 SEE ALSO 🌈

• Kernel file ./drivers/cxl/mem.c
• devm_cxl_add_classdev(9)
• devm_cxl_probe_mem(9)

Keep these on your radar, iykyk. 🫶

Source/version + date check: ./drivers/cxl · October 2026 · cxl mem(9). Byeee bestie, go read the kernel file and slay 💖✨