sdma_v4_0_ring_test_ring(9)

📦 version 7.3.1, in nixpkgs unstable

💖 sdma_v4_0_ring_test_ring(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes we're in kernel land today, grab your iced coffee 🧊 because this one's a little function with a big job. It's the sdma_v4_0_ring_test_ring page and it is, and I cannot stress this enough, a vibe check for your DMA engine ✨

✨ NAME ✨

sdma_v4_0_ring_test_ring — simple async dma engine test 🎀

Like literally what it says on the tin: a simple async DMA engine test. That's her whole personality. No cap.

🌸 SYNOPSIS 🌸

int sdma_v4_0_ring_test_ring (struct amdgpu_ring *ring );

int-returning, one-argument, extremely focused. She knows what she wants 👑

🦋 ARGUMENTS 🦋

  • ring — the amdgpu_ring structure that's holding all your ring information. this is the bestie she's testing. give her a good ring and she'll do the rest 🫶

💅 DESCRIPTION 💅

So here's the whole thing: she tests the DMA engine by using it to write a value to memory. Yes, using the engine to write, that's the test, that's the flex 🔥 (this is the VEGA10 situation btw, iykyk).

Then she tells you how it went:

  • Returns 0 for success ✅ slay
  • Returns an error for failure 😭 not slay

That's it. That's the function. Short king behaviour but honestly the whole GPU relies on her, so. main character energy fr fr.

ok real talk — the return value is literally the entire result here, so please actually check it. ignoring it is giving "I'll read the docs later" and we both know how that ends 💀

🌈 SEE ALSO 🌈

the whole friend group, honestly, they're all in the same file and they all show up to the group chat:

and that's the page!! 🍓 cute lil sign-off time: this whole thing lives in ./drivers/gpu/drm/amd/amdgpu and it's dated October 2026, so like, future vibes only 💜🌙 go test that ring bestie, you got this 🧚💖

📦 where this page comes from