r600_semaphore_ring_emit(9)

💜 r600_semaphore_ring_emit — the kernel API manual, bestie edition 💜

Okay so like, welcome to the r600_semaphore_ring_emit(9) page, which lives in the Kernel API Manual and is genuinely one of those tiny functions that does SO much. Grab a snack, we're doing this. 🍓

---

✨ NAME ✨

r600_semaphore_ring_emit — emit a semaphore on the CP ring 👑

Like... that's it, that's the whole vibe. It emits a semaphore. On the CP ring. Iconic behaviour.

---

🌸 SYNOPSIS 🌸

bool r600_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 — a radeon_device pointer. Your whole GPU device situation, basically the main character of the radeon world.
• ring — a radeon ring buffer object. This is the ring we're sliding the packet onto. ✨
• semaphore — a radeon semaphore object. The actual semaphore in question, the star of the show.
• emit_wait — Is this a semaphore wait? That's literally the question it's asking. bool, no cap. 🙈

---

🔥 DESCRIPTION 🔥

So what she does is: emits a semaphore signal/wait packet to the CP ring, and — this is the important part, don't skip it — prevents the PFP from running ahead of semaphore waits. 🫶

That's the whole thing. Signal/wait packet → CP ring. PFP stays in its lane. No running ahead. Periodt. ⭐

---

🧚 SEE ALSO 🧚

Kernel file: ./drivers/gpu/drm/radeon/r600.c

And the whole friend group of related pages, all of whom you should absolutely go read next:

• r600_get_allowed_info_register(9)
• r600_get_xclk(9)
• r600_vram_gtt_location(9)
• r600_gfx_is_lockup(9)
• r600_copy_cpdma(9)
• r600_mmio_hdp_flush(9)
• r600_get_gpu_clock_counter(9)

---

And that's the page, bestie!! 🎀 This little icon comes to you from ./drivers/gpu/drm/radeon, dated October 2026, and honestly? October 2026 said "I'm the moment" and delivered. 💖 Go emit some semaphores responsibly, love you, bye! 🌈💜