sdma_v5_2_ring_test_ib(9)

📦 version 7.3.1, in nixpkgs unstable

💖 sdma_v5_2_ring_test_ib — kernel API manual, section 9 🎀

Okay bestie, so this is page sdma_v5_2_ring_test_ib(9) from the Kernel API Manual, and it's literally just one little function that checks if a DMA ring actually works. Short page, but we're gonna make it iconic anyway. ✨

🌸 NAME 🌸

sdma_v5_2_ring_test_ib — test an IB on the DMA engine

Like, it pokes the DMA engine with an IB (that's an indirect buffer, iykyk) and sees if it survives. Vibe check for hardware. 🦋

✨ SYNOPSIS ✨

int sdma_v5_2_ring_test_ib (struct amdgpu_ring *ring , long timeout );

That's the whole signature, no cap. int goes in, int comes out, and the drama happens in between. 💅

🎀 ARGUMENTS 🎀

  • ring — the amdgpu_ring structure that's holding all the ring info. This is your main character — it's the thing getting tested. 👑
  • timeout — how long you're willing to wait, in jiffies, or you can just throw MAX_SCHEDULE_TIMEOUT at it if you're feeling patient and infinite. ⏳

🔥 DESCRIPTION 🔥

So the whole plot: it tests a simple IB in the DMA ring. That's it, that's the function.

Returns 0 on success, and an error on failure. So basically if you get 0 back, slay, the ring is fine 💖. If you get an error, something's not giving and you should probably look into it. 😭

🫶 SEE ALSO 🫶

Kernel file ./drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c — that's the source of truth, go read it if you're nosy (respectfully).

And here's the whole friend group, the entire squad of related functions, all in section 9 because that's their era:

Twenty-five entries, all accounted for, no skipping the boring ones in this house. 🌈

Heads up bestie: that timeout is in jiffies, not seconds, not milliseconds. Don't be out here guessing units. 🙈

💜 and that's the page! 💜

Cute little sign-off for you: this one lives in ./drivers/gpu/drm/amd/amdgpu, it's dated October 2026, and yes, it's very much a section 9 moment. Go test those rings, bestie. 💅🌸🍓

📦 where this page comes from