svm_migrate_..._memory_gart(9)

💖 svm_migrate_..._memory_gart(9) — Kernel API Manual 💖

okay bestie, welcome to the svm_migrate_..._memory_gart(9) page — that's the title, and the manual name is Kernel API Manual. this is the kernel API glow-up for the sdma migration copy situation, and we're keeping every detail because that's the vibe. periodt. 💅

🎀 NAME 🎀

svm_migrate_copy_memory_gart — sdma copy data between ram and vram. iconic behavior, no notes. ✨

✨ SYNOPSIS ✨

int svm_migrate_copy_memory_gart (struct amdgpu_device *adev ,
dma_addr_t *sys , u64 *vram , u64 npages , enum MIGRATION_COPY_DIR
direction , struct dma_fence **mfence );

🌸 ARGUMENTS 🌸

• adev — the amdgpu device the sdma ring is running. main character device energy. 👑
• sys — system DMA pointer to be copied. yes bestie, that one. 🫶
• vram — vram destination DMA pointer. the destination is giving destination. 💖
• npages — number of pages to copy. count 'em. 🔢
• direction — enum MIGRATION_COPY_DIR. that's the enum, exactly like that. 🦋
• mfence — output, sdma fence to signal after sdma is done. it's literally the output fence situation. ⭐

🦋 DESCRIPTION 🦋

okay so here's the whole deal: the ram address uses GART table continuous entries mapping to ram pages, and the vram address uses direct mapping of vram pages — those vram pages must have npages number of continuous pages. no cap. 🌈

GART update and sdma use the same buf copy function ring, sdma is splited to multiple GTT_MAX_PAGES transfer, all sdma operations are serialized, and you wait for the last sdma finish fence — which is returned — to check copy memory is done. that's the entire pipeline, bestie. don't skip the serialized part. 🔥

💜 CONTEXT 💜

Process context — that's the context. that's it. that's the whole context section. 💜

👑 RETURN 👑

0 — OK, otherwise error code. so like, 0 is the slay outcome, and anything else is an error code. 🎀

🌈 SEE ALSO 🌈

• Kernel file: ./drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
• svm_migrate_copy_done(9)
• svm_migrate_ram_to_vram(9)
• svm_migrate_vma_to_ram(9)
• svm_migrate_vram_to_ram(9)
• svm_migrate_vram_to_vram(9)
• svm_migrate_to_ram(9)

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and that's the whole page, bestie — source/version: ./drivers/gpu/drm/amd/amdkfd, date: October 2026, page handle: svm_migrate_..._memory_gart(9). mwah 💅💖