amdgpu_dma_buf_unmap(9)

✨ amdgpu_dma_buf_unmap(9) ✨

okay so this is a page from the Kernel API Manual, and bestie, we're about to get into it 💅

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🌸 NAME 🌸

amdgpu_dma_buf_unmap — literally the &dma_buf_ops.unmap_dma_buf implementation 🎀

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🦋 SYNOPSIS 🦋

void amdgpu_dma_buf_unmap (struct dma_buf_attachment *attach , struct
sg_table *sgt , enum dma_data_direction dir );

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💖 ARGUMENTS 💖

• attach — the DMA-buf attachment, aka who's holding onto this thing 🫶
• sgt — the sg_table you wanna unmap
• dir — the DMA direction

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🌈 DESCRIPTION 🌈

So here's the vibe: this gets called when a shared DMA buffer doesn't need to be reachable by some other device anymore. Somebody's leaving the group chat, it's fine, it happens 😭

For now? It just unpins the buffer from GTT. That's it. That's the whole character arc. No cap, that's all it does ✨

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👑 SEE ALSO 👑

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c — and honestly, the whole friend group:

• 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_map(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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💀 reminder for my fellow gremlins: this page lives in ./drivers/gpu/drm/amd/amdgpu, dated October 2026. Don't @ me if you're reading it in the wrong tree 🍓

ok bye bestie, go unmap something responsibly 🧚💜