GUC DOORBELLS(9)

🎀 GuC Doorbells 🎀

okay bestie, welcome to the GuC Doorbells(9) page from the Kernel API Manual — yes, that Kernel API Manual, the one that lives in your dreams and also in ./drivers/gpu/drm/xe 💅

So here's the vibe: the GFX doorbell solution is literally a whole mechanism for submitting workloads to the graphics hardware directly from a ring3 application — and the slay part? no penalty of a ring transition for every single workload submission. like, not me avoiding the ring transition tax every time, we love a low-overhead queen 👑✨

Now, plot twist for the SR-IOV girlies 🌸 — in SR-IOV mode, the doorbells are treated as a shared resource, and the PF must be able to provision an exclusive range of IDs across VFs, which may want to use this feature. fr fr, sharing is caring but the ranges have to be exclusive, no cap 🫶

✨ SEE ALSO ✨

• the kernel file ./drivers/gpu/drm/xe/xe_guc_db_mgr.c 🦋
• xe_guc_db_mgr_init(9)
• xe_guc_db_mgr_reserve_id_locked(9)
• xe_guc_db_mgr_release_id_locked(9)
• xe_guc_db_mgr_reserve_range(9)
• xe_guc_db_mgr_release_range(9)
• xe_guc_db_mgr_print(9)

go read them, bestie, they're iconic and they're literally listed above 💖

sign-off time, mwah 🎀 this lil masterpiece comes to you from ./drivers/gpu/drm/xe, dated October 2026, and it's forever known as GuC Doorbells(9) — periodt 💅🌟