GUC RC (RENDER C-STATES)(9)

👑 GuC RC (Render C-states) 👑

okay so bestie, this is the GuC RC (Render C-states)(9) page from the Kernel API Manual, and it's literally giving "graphics goes to sleep, but make it coordinated" energy 💤✨

The way that GuC handles the GT transition to deeper C-states is in conjunction with Pcode. And yes, GuC RC can be enabled independently of the frequency component in SLPC, which is also controlled by GuC. no cap 🫶

This file will contain all H2G related logic for handling Render C-states. There are some calls to xe_gt_idle, where we enable host C6 when GuC RC is skipped 👀

GuC RC is mostly independent of xe_guc_pc — with the exception of functions that override the mode, for which we have to rely on the SLPC H2G calls. periodt 💅

✨ SEE ALSO ✨

• Kernel file ./drivers/gpu/drm/xe/xe_guc_rc.c — xe_guc_rc_disable(9), xe_guc_rc_init(9), xe_guc_rc_enable(9) 🌸

Signed off from ./drivers/gpu/drm/xe, dated October 2026, and officially titled GuC RC (Render C-states)(9) 💖