amdgpu_ttm_copy_mem_to_mem(9)

💅 amdgpu_ttm_copy_mem_to_mem(9)

Okay so bestie, welcome to the Kernel API Manual entry for amdgpu_ttm_copy_mem_to_mem — yes that's a whole mouthful, no we're not renaming it, it's iconic as is 🎀

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✨ NAME ✨

amdgpu_ttm_copy_mem_to_mem — the helper function for copy 💖 literally what it says on the tin, she's a helper, she copies.

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🌸 SYNOPSIS 🌸

int amdgpu_ttm_copy_mem_to_mem (struct amdgpu_device *adev , struct
amdgpu_ttm_buffer_entity *entity , const struct amdgpu_copy_mem *src ,
const struct amdgpu_copy_mem *dst , uint64_t size , bool tmz , struct
dma_resv *resv , struct dma_fence **f );

That's the whole signature, copied character for character because we do not play with code integrity in this house 🫶

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🦋 ARGUMENTS 🦋

• adev — the amdgpu device. the main character, honestly 👑
• entity — the entity to run the jobs. she's the one scheduling the whole thing ✨
• src — buffer/address where to read from. the source, the origin story 🌈
• dst — buffer/address where to write to. the destination, the glow-up destination 💅
• size — number of bytes to copy. yes, a uint64_t, so she can go big 🔥
• tmz — if a secure copy should be used. bool, so it's a yes/no vibe check 🔐
• resv — resv object to sync to. keep it in sync, bestie, or it's chaos 😭
• f — returns the last fence if multiple jobs are submitted. so you get the last one, not the first, noted 📝

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💜 DESCRIPTION 💜

The function copies size bytes from {src->mem + src->offset} to {dst->mem + dst->offset}. Simple as that, no cap 💀

And here's the cute part: src->bo and dst->bo could be the same BO for a move, and different for a BO to BO copy. So like… same buffer object, different buffer object, she does not care, she slays either way 🧚

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⭐ SEE ALSO ⭐

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c — go read the source, iykyk 📖

And the whole friend group, all of them, in order:

• amdgpu_evict_flags(9)
• amdgpu_ttm_map_buffer(9)
• amdgpu_res_cpu_visible(9)
• amdgpu_ttm_domain_start(9)
• amdgpu_ttm_mmio_remap_alloc_sgt(9)
• amdgpu_ttm_tt_create(9)
• amdgpu_ttm_tt_get_userptr(9)
• amdgpu_ttm_tt_set_userptr(9)
• amdgpu_ttm_tt_pde_flags(9)
• amdgpu_ttm_tt_pte_flags(9)
• amdgpu_ttm_access_memory(9)
• amdgpu_ttm_training_reserve_vram_fini(9)
• amdgpu_ttm_alloc_mmio_remap_bo(9)
• amdgpu_ttm_free_mmio_remap_bo(9)
• amdgpu_ttm_enable_buffer_funcs(9)
• amdgpu_ttm_disable_buffer_funcs(9)
• amdgpu_ttm_clear_buffer(9)
• amdgpu_ttm_evict_resources(9)

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ok that's the whole thing, every flag, every argument, every reference, nothing skipped, we ate and left no crumbs 🍓

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mwuh 💋 this page lives in ./drivers/gpu/drm/amd/amdgpu and it's dated October 2026 — see you in the next one, bestie! 🎀💖✨