CTB BASED COMMUNICATION(9)

🦋 CTB based communication(9) 🦋

hii bestie, this is the Kernel API Manual — yes, the CTB based communication page, section 9, and it's giving kernel lore. 💅

Okay so real talk: CTB means command transport buffer. That's the communication between Host and GuC, and it's based on a u32 data stream written to the shared buffer. One buffer can be used to transmit data only in one direction — one-directional channel, no cap, no sneaky reverse traffic. 🚫🔁

Status check? The current status of each buffer is maintained in CTB Descriptor_. Each message in the data stream is encoded as CTB HXG Message_. Iconic, honestly. ✨

🌸 SEE ALSO 🌸

• Kernel file ./drivers/gpu/drm/xe/abi/guc_communication_ctb_abi.h
• CT Buffer(9)
• CTB Descriptor(9)
• CTB Message(9)
• CTB HXG Message(9)

mwah 💋 signed off from the source path ./drivers/gpu/drm/xe/abi, dated October 2026. Bye bestie, go slay your kernel reading! 🫶🎀