wait_for_ct_request_update(9)

👑 wait_for_ct_request_update(9) 👑

okay so welcome to the Kernel API Manual bestie, section 9, and today's main character is wait_for_ct_request_update — literally the function that sits there and waits for your CT request to get its state update. no cap, that's the whole vibe.

---

✨ NAME ✨

wait_for_ct_request_update — wait for CT request state update</p> 💅

---

🌸 SYNOPSIS 🌸

int wait_for_ct_request_update (struct intel_guc_ct *ct , struct
       ct_request *req , u32 *status );

she takes three args and returns an int, periodt.

---

🎀 ARGUMENTS 🎀

• ct — pointer to CT 🦋 (yes, that's CT, the thing itself)
• req — pointer to the pending request, like the one still waiting on read receipts 😭
• status — placeholder for status, aka where the answer gets dropped off 💌

---

🧚 DESCRIPTION 🧚

so here's the lore: for each sent request, GuC shall send back a CT response message. that's the deal, fr fr. our message handler will update the status of the tracked request once the response message with the given fence is received — think of it like the handler marking your message as seen ✅.

meanwhile, this function just waits here and checks for a valid response status value. it's giving "standing outside the group chat waiting for a reply" energy. 🫶

---

🔥 RETURN 🔥

• 0 — response received (and the status is valid, slay 💖)
• -ETIMEDOUT — no response within the hardcoded timeout 😭💀 (yes, hardcoded, don't come for me)

---

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c — CTB Blob(9) ⭐
• intel_guc_ct_init_early(9)
• intel_guc_ct_init(9)
• intel_guc_ct_fini(9)
• intel_guc_ct_enable(9)
• intel_guc_ct_disable(9)

all the CT siblings, one big happy family 👑

---

ngl bestie, if you're seeing -ETIMEDOUT the vibes are NOT immaculate — the response never showed up. 🙈

okay that's the page!! this lil beauty lives over at ./drivers/gpu/drm/i915/gt/uc, dated October 2026, and it's the wait_for_ct_request_update(9) manual through and through. ty for reading, mwah 💜🎀✨