GuC(9)

🎀 GuC 🎀

okay so bestie, this is the GuC(9) page from the Kernel API Manual — section 9, and it's literally about the GuC. The GuC is a microcontroller inside the GT HW, introduced in gen9. It’s designed to offload some of the functionality usually performed by the host driver; currently the main operations it can take care of are:

• Authentication of the HuC, which is required to fully enable HuC usage.
• Low latency graphics context scheduling (a.k.a. GuC submission).
• GT Power management.

The enable_guc module parameter is your little menu: use it to select which of those operations to enable within GuC. Note that not all the operations are supported on all gen9+ platforms. iykyk.

Enabling the GuC is not mandatory, and therefore the firmware is only loaded if at least one of the operations is selected. But listen: not loading the GuC might result in the loss of some features that do require the GuC (currently just the HuC, but more are expected to land in the future). 🙈

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/i915/gt/uc/intel_guc.c
• intel_guc_auth_huc(9)
• intel_guc_suspend(9)
• intel_guc_resume(9)
• GuC Memory Management(9)
• intel_guc_allocate_vma(9)
• intel_guc_allocate_and_map_vma(9)
• intel_guc_load_status(9)

Okay bye bestie 🫶 — this one lives at ./drivers/gpu/drm/i915/gt/uc, it’s dated October 2026, and the footer vibe is GuC(9) from the Kernel API Manual. 💖✨