sdma_v4_4_2_ring_emit_fence(9)

📦 version 7.3.1, in nixpkgs unstable

💖 sdma_v4_4_2_ring_emit_fence — a whole vibe (kernel API manual, bestie edition) 💖

okay so real talk, this is a page out of the Kernel API Manual, and it's about one (1) function: sdma_v4_4_2_ring_emit_fence. she's a lil function, she does one thing, and she does it well. slay. 🎀

✨ NAME ✨

sdma_v4_4_2_ring_emit_fence — emit a fence on the DMA ring. literally that's her whole job. no cap. 🦋

🌸 SYNOPSIS 🌸

void sdma_v4_4_2_ring_emit_fence (struct amdgpu_ring *ring , u64 addr ,
       u64 seq , unsigned flags );

that's it. that's the whole signature. she takes four things and returns void, because she's humble like that. 👑

💅 ARGUMENTS 💅

  • ring — amdgpu ring pointer. yes bestie, the ring, the DMA one, this is the main character of the whole story.
  • addr — address. that's the whole description. address. icon behavior honestly.
  • seq — sequence number. it's the number, and it's got sequence energy.
  • flags — fence related flags, iykyk. you know what they are. fence-related. 🚩

🔥 DESCRIPTION 🔥

so what does she actually do? two things, and both of them eat:

  1. she adds a DMA fence packet to the ring, which writes out the fence seq number, and
  2. she adds a DMA trap packet to generate an interrupt — but only if needed. not out here interrupting for no reason. boundaries. 💀

that's the whole plot. fence written, trap set up if needed, done, bye. 🫶

🌈 SEE ALSO 🌈

the kernel file lives right here, come visit:

  • ./drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c

and now, the friend group — the whole sdma_v4_4_2 family, all of them, no one left out (this is a big friend group and we love that for us):

bestie note: this page comes from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's page sdma_v4_4_2_ring_emit_fence(9) of the Kernel API Manual. that's the whole footer, folded in with love 🧚💜

okay bye, go emit some fences, and remember: interrupt only if needed. ✨🍓

📦 where this page comes from