HXG FAST REQUEST(9)

👑 HXG FAST REQUEST(9) 👑

okay so bestie, welcome to HXG Fast Request — section 9 of the Kernel API Manual, the little fire-and-forget king of the HXG message family. 🔥

---

💌 the actual tea

The HXG Request_ message should be used to initiate asynchronous activity for which confirmation or return data is not expected. ✨

If confirmation is required then HXG Request_ shall be used instead. periodt. 💅

The recipient of this message may only use HXG Failure_ message if it was unable to accept this request (like invalid data). that's the one and only escape hatch, no cap. 🫶

Format of HXG Fast Request_ message is same as HXG Request_ except TYPE. literally identical otherwise, the TYPE field is the whole entire plot twist. 😭

---

🎀 the bit layout (yes she's giving spreadsheet but make it cute)

• Bits 0, 31 — ORIGIN — see HXG Message_
• Bits 30:28 — TYPE = GUC_HXG_TYPE_FAST_REQUEST_
• Bits 27:16 — DATA0 — see HXG Request_
• Bits 15:0 — ACTION — see HXG Request_

and then bestie, it just keeps going:

...       DATAn - see `HXG Request`_

like the DATA keeps rolling on out to DATAn, each one doing exactly what HXG Request_ says it does. 🌸

---

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/xe/abi/guc_messages_abi.h — the source of truth, go read her 📖
• HXG Message(9)
• HXG Request(9)
• HXG Event(9)
• HXG Busy(9)
• HXG Retry(9)
• HXG Failure(9)
• HXG Response(9)

the whole friend group honestly, you gotta meet all of them 💜

---

mwah 💋 that's the page! this one lives in ./drivers/gpu/drm/xe/abi, dated October 2026, and she ate, no crumbs. 🧚‍♀️⭐🍓