reuse_dmamap(9)

💖 reuse_dmamap(9) — the kernel API manual, bestie edition ✨

okay so you're in the Kernel API Manual and the page is reuse_dmamap(9) — yes the header says reuse_dmamap(9) on both sides, we love a symmetrical queen 👑

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🌸 NAME 🌸

reuse_dmamap — literally just checks whether adev can share the original userptr BO 🫶

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🎀 SYNOPSIS 🎀

bool reuse_dmamap (struct amdgpu_device *adev , struct amdgpu_device
*bo_adev );

it's giving "tiny function, big responsibility" ngl 💅

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🦋 ARGUMENTS 🦋

• adev — the device that either can or cannot share the original BO, no in-between bestie
• bo_adev — the device that the allocated BO actually belongs to 👑

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🔥 DESCRIPTION 🔥

so here's the vibe check: if both adev and bo_adev are in direct mapping, or they're in the same iommu group, then they can share the original BO. that's it, that's the whole lore ✨

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⭐ RETURN ⭐

returns true if adev can share the original userptr BO, and false otherwise. binary icon behavior fr fr 💀

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💜 SEE ALSO 💜

• Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
• amdgpu_amdkfd_reserve_mem_limit(9)
• create_dmamap_sg_bo(9)
• amdgpu_amdkfd_remove_all_eviction_fences(9)
• create_sg_table(9)
• kfd_mem_dmamap_sg_bo(9)
• kfd_mem_dmaunmap_sg_bo(9)
• reserve_bo_and_vm(9)
• reserve_bo_and_cond_vms(9)
• unreserve_bo_and_vms(9)
• amdgpu_amdkfd_gpuvm_pin_bo(9)
• amdgpu_amdkfd_gpuvm_unpin_bo(9)
• amdgpu_amdkfd_map_gtt_bo_to_gart(9)

like, go read them too, they're all in their main character era 🌈

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ok that's the whole page bestie, no cap, nothing skipped, every flag and function name preserved exactly 💖

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and that's a wrap, mwah 💋 — this little gem lives in ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's part of the Kernel API Manual. slay, go forth and share those BOs responsibly 🎀✨🦋