cik_semaphore_ring_emit(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cik_semaphore_ring_emit(9) — the Kernel API Manual glow-up ✨

okay so bestie, we're in the Kernel API Manual today and the page is cik_semaphore_ring_emit(9). yes it's a real function name. yes it's a mouthful. no we're not scared of it. let's go 🎀

✨ NAME ✨

cik_semaphore_ring_emit — emit a semaphore on the CP ring 🦋

like, you're literally telling the CP ring "hey bestie here's a semaphore" and it goes and does it. main character behavior tbh.

🌸 SYNOPSIS 🌸

bool cik_semaphore_ring_emit (struct radeon_device *rdev , struct
radeon_ring *ring , struct radeon_semaphore *semaphore , bool emit_wait
);

she returns a bool, she takes four args, she's booked and busy 💅

💖 ARGUMENTS 💖

  • rdev — radeon_device pointer. your device bestie. the whole radeon situation, distilled into a pointer. 🫶
  • ring — radeon ring buffer object. the ring we're emitting onto. the venue, if you will. ⭐
  • semaphore — radeon semaphore object. the actual semaphore being signalled or waited on. the guest of honor 👑
  • emit_wait — Is this a semaphore wait? literally the vibe check for this call: true = it's a wait, false = it's a signal. iykyk 😌

🔥 DESCRIPTION 🔥

So what does she do? She emits a semaphore signal/wait packet to the CP ring — like, drops that packet right onto the ring — and she prevents the PFP from running ahead of semaphore waits. that's the whole thing. no cap. 🧚

it's giving "traffic cop but make it GPU microcode." the PFP does not get to skip ahead of the waits. periodt. 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/gpu/drm/radeon/cik.c — that's where the source lives, bestie, go read it, it's iconic 🍓

and now the extended universe, the whole friend group, no one left behind:

ngl, that's a lot of siblings. but they're all valid, they all live in ./drivers/gpu/drm/radeon, and they all get a (9). respect the family 💜

okay that's the whole page!! 🎀 mwah 💋

signing off from ./drivers/gpu/drm/radeon, dated October 2026 — that's the source and version footer bestie, we mention it and we move on ✨🦋🌸

📦 where this page comes from