amdgpu_dma_buf_map(9)

💅 amdgpu_dma_buf_map(9) — your fave kernel API manual, bestie

okay so this whole page lives in the Kernel API Manual, and the star of the show is amdgpu_dma_buf_map — literally the &dma_buf_ops.map_dma_buf implementation. no cap, that's the whole vibe. 🦋

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✨ NAME ✨

amdgpu_dma_buf_map — bestie, this is the &dma_buf_ops.map_dma_buf implementation, that's it, that's the name 🎀

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🌸 SYNOPSIS 🌸

struct sg_table * amdgpu_dma_buf_map (struct dma_buf_attachment *attach
, enum dma_data_direction dir );

like, look at her. iconic signature. 👑

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🧚 ARGUMENTS 🧚

• attach — the DMA-buf attachment 💖 like, the whole connection, the situationship between the buffer and the device.
• dir — the DMA direction 🌈 which way the data's flowing, iykyk.

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💜 DESCRIPTION 💜

so what does she do? she makes absolutely sure the shared DMA buffer can be accessed by the target device. that's the job. that's the assignment and she ate. 🔥

for now? she simply pins it to the GTT domain — and that's the whole move, because that's where it should be accessible by all DMA devices. lowkey elegant, highkey necessary. 💅

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⭐ RETURN ⭐

on a good day you get an sg_table filled with the DMA addresses to use ✨

and on a bad day? ERR_PRT with a negative error code 😭🙈 — that's the error vibe check failing, fr fr.

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🫶 SEE ALSO 🫶

bestie, the whole friend group is here, like a group chat that never sleeps:

• kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
• PRIME Buffer Sharing(9)
• dma_buf_attach_adev(9)
• amdgpu_dma_buf_attach(9)
• amdgpu_dma_buf_detach(9)
• amdgpu_dma_buf_pin(9)
• amdgpu_dma_buf_unpin(9)
• amdgpu_dma_buf_unmap(9)
• amdgpu_dma_buf_begin_cpu_access(9)
• amdgpu_gem_prime_export(9)
• amdgpu_dma_buf_create_obj(9)
• amdgpu_dma_buf_move_notify(9)
• amdgpu_gem_prime_import(9)
• amdgpu_dmabuf_is_xgmi_accessible(9)

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ok that's the whole page, go read the source bestie, mwah 🍓

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and finally, the cute little sign-off: this lil masterpiece comes from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's amdgpu_dma_buf_map(9) — periodt. 💖🎀