sdma_v2_4_ring_emit_fence(9)

📦 version 7.3.1, in nixpkgs unstable

💖 sdma_v2_4_ring_emit_fence(9) 💖

okay so bestie, we're in the Kernel API Manual today — yes, the Kernel API Manual, we're being fancy — and this is literally the page for sdma_v2_4_ring_emit_fence. ngl it's giving "one little function that does one very specific thing" and honestly? iconic.

✨ NAME ✨

sdma_v2_4_ring_emit_fence — bestie, this one emits a fence on the DMA ring. That's it, that's the whole vibe. 🎀

🦋 SYNOPSIS 🦋

void sdma_v2_4_ring_emit_fence (struct amdgpu_ring *ring , u64 addr ,
u64 seq , unsigned flags );

so you call it, it returns void (no return value, no drama, it just does the thing), and it takes four arguments. keep scrolling, we're getting to all of them 💅

🌸 ARGUMENTS 🌸

  • ring — an amdgpu ring pointer. it's the ring, it's a pointer, it's amdgpu. arguably the main character of this whole function 🔥
  • addr — an address. (yes really, that's the whole description, we love a mystery ✨)
  • seq — the sequence number. your fave little counter 💜
  • flags — fence related flags. fence-adjacent. flags for the fence. flags that are, in a very real way, fence related 🙈

👑 DESCRIPTION 👑

ok so what does this actually do, because a synopsis is not a personality 💀

It adds a DMA fence packet to the ring — that packet writes the fence seq number. Then it adds a DMA trap packet to generate an interrupt if needed. And that's for VI. 🌈

that's the whole thing. two packets, one job, slayed. 🫶

🔥 SEE ALSO 🔥

the kernel file lives at ./drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c — go say hi to it, it's got the whole family in there 🧚

and here's the full squad, no cap, every single one:

they're all in ./drivers/gpu/drm/amd/amdgpu together, one big happy directory 🏠💖

and that's the page!! this lil drop came to you from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and yes — we're still running sdma_v2_4_ring_emit_fence(9) in the Kernel API Manual. mwah, ilysm, go write some fences bestie 💅✨🍓

📦 where this page comes from