sdma_v7_1_ring_emit_fence(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sdma_v7_1_ring_emit_fence(9) — the Kernel API Manual glow-up 🎀

okay so bestie, welcome to section 9 of the Kernel API Manual, where we talk about the SDMA v7.1 ring fence emitter. yes it's as niche as it sounds and yes it's iconic ✨

🌸 NAME 🌸

sdma_v7_1_ring_emit_fence — literally just emit a fence on the DMA ring 🦋 that's the whole job, that's the assignment, periodt.

✨ SYNOPSIS ✨

void sdma_v7_1_ring_emit_fence (struct amdgpu_ring *ring , u64 addr ,
u64 seq , unsigned flags );

no cap, that's the whole signature. four args, one void, zero drama 💅

🫶 ARGUMENTS 🫶

  • ring — the amdgpu ring pointer, aka the main character of this whole operation 👑 she's the queue everything gets written into.
  • addr — address. the spot where stuff lands. yep. that's it. that's the note 🌈
  • seq — fence seq number, the little sequence number that gets written out so everyone knows where we're at fr fr 🔢
  • flags — fence flags, the little options bundle that says how you want this fence to behave 🎀

💖 DESCRIPTION 💖

so what actually happens? two things, and they're both giving:

  1. it adds a DMA fence packet to the ring, which writes out that fence seq number 📝
  2. it adds a DMA trap packet to generate an interrupt — but only if needed ⚡ (iykyk — conditional interrupt, she's not out here doing extra work for no reason)

that's the whole vibe. fence gets written, interrupt maybe gets fired, everyone goes home. slay 🧚

👀 SEE ALSO 👀

the kernel file itself lives at:

./drivers/gpu/drm/amd/amdgpu/sdma_v7_1.c

and here's the whole friend group, every single one, no skips 🫶:

💀 no warnings, no bugs, no deprecated nonsense on this page — just a clean fence emitter doing her thing. you're safe bestie 🍓

and that's a wrap!! this little gem comes from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and yes it's the same sdma_v7_1_ring_emit_fence(9) page you just read, so we've come full circle bestie 💜 go emit some fences, you've got this 🫶✨

📦 where this page comes from