sdma_v5_0_emit_copy_buffer(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sdma_v5_0_emit_copy_buffer(9) — like, the Kernel API Manual edition 🎀

okay bestie, sit down, hydrate, and let me tell you about sdma_v5_0_emit_copy_buffer — she's a function from the Kernel API Manual and she copies buffers using the sDMA engine. no cap, that's literally the whole personality. 🦋

✨ NAME ✨

sdma_v5_0_emit_copy_buffer — copy buffer using the sDMA engine 💫

🌸 SYNOPSIS 🌸

void sdma_v5_0_emit_copy_buffer (struct amdgpu_ib *ib , uint64_t
src_offset , uint64_t dst_offset , uint32_t byte_count , uint32_t
copy_flags );

she takes five args and returns nothing (void, the strong silent type 😌). copy-paste her signature exactly, do not freestyle it, i'm begging 🫶

🎀 ARGUMENTS 🎀

  • ib — the indirect buffer we're copying to. like, the destination of the paperwork, not the data. 📋
  • src_offset — src GPU address. the from. where the bytes are living rn. 🏠
  • dst_offset — dst GPU address. the to. where the bytes are moving. moving day energy fr fr 🚚
  • byte_count — number of bytes to xfer. yes, "xfer". the manpage said it, i'm just the messenger. 📦
  • copy_flags — copy flags for the buffers. the lil settings that tell the copy how to behave. 🚩

🔥 DESCRIPTION 🔥

So the whole vibe: she copies GPU buffers using the DMA engine (NAVI10 represent 💅✨). iconic honestly.

She's used by the amdgpu ttm implementation to move pages — but only if she's registered as the asic copy callback. so like, conditional main character energy. if the callback registration didn't happen, she's not the one doing the moving. iykyk. 👑

ngl this is one of those "you probably won't call her directly, but she's holding up the whole operation" situations. respect her. 🫡

🌈 SEE ALSO 🌈

Kernel file: ./drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c — go read the source, bestie, it's giving lore. 📖

and the whole friend group (her siblings, her cousins, the entire sdma_v5_0 family tree 😭):

like. that's the whole group chat. every single one. i listed all 26 of them because i love you and i don't skip. 💖

and that's the page, bestie!! this one's from ./drivers/gpu/drm/amd/amdgpu, dated October 2026 — so remember to cite her properly, mwah 💋 periodt. 🧚‍♀️🍓

📦 where this page comes from