sdma_v4_0_start(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sdma_v4_0_start(9) — like, the whole glow-up for your DMA engines

okay bestie, welcome to the Kernel API Manual ✨ today we're talking about sdma_v4_0_start, and honestly? she's kind of a big deal. sit down, grab a strawberry drink 🍓, and let's get into it.

🎀 NAME 🎀

sdma_v4_0_start — the one that sets up and starts the async dma engines, no cap 🫶

✨ SYNOPSIS ✨

int sdma_v4_0_start (struct amdgpu_device *adev );

like, that's literally it. one function, one arg, one int coming back at you 💖

🌸 ARGUMENTS 🌸

  • adev — an amdgpu_device pointer, i.e. the main-character struct that tells her which GPU she's working with 🔥

🦋 DESCRIPTION 🦋

so here's the tea ☕: sdma_v4_0_start sets up the DMA engines and then enables them (this is the VEGA10 flavour, iykyk).

she returns 0 for success, and an error for failure — so like, always do a vibe check on that return value, bestie, don't just ignore her 😭

fr fr, 0 = slay, anything else = something went sideways and you need to deal with it 🙈

👑 SEE ALSO 👑

the kernel file she lives in, in all her glory:

  • ./drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

and her whole friend group (they're all in the same file, it's giving squad goals 🌈):

that's the whole page, bestie, you ate that 🍽️💅 and yeah — this gem comes straight out of ./drivers/gpu/drm/amd/amdgpu, dated October 2026. iconic. mwah 😘💜

📦 where this page comes from