sdma_v6_0_emit_copy_buffer(9)

💅 sdma_v6_0_emit_copy_buffer

okay so bestie, welcome to the Kernel API Manual ✨ this one's a function page and it's lowkey iconic — it's all about making the sDMA engine do a copy for you. no cap, it's a whole vibe.

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🦋 NAME

sdma_v6_0_emit_copy_buffer — copy buffer using the sDMA engine 💖

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✨ SYNOPSIS

void sdma_v6_0_emit_copy_buffer (struct amdgpu_ib *ib , uint64_t
src_offset , uint64_t dst_offset , uint32_t byte_count , uint32_t
copy_flags );

like… that's the whole signature, she's right there 👑

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🎀 ARGUMENTS

• ib — the indirect buffer you're gonna fill with commands 🫶 literally the canvas, the main character
• src_offset — src GPU address. where the tea is coming from 💫
• dst_offset — dst GPU address. where it's going, slay 🎯
• byte_count — number of bytes to xfer 📦 the actual amount, don't fumble it
• copy_flags — copy flags for the buffers 🚩 the little settings that come along for the ride

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🌸 DESCRIPTION

Copy GPU buffers using the DMA engine ✨ that's it, that's the job.

It's used by the amdgpu ttm implementation to move pages — but only if it's registered as the asic copy callback 👀 so like, conditional queen behavior, iykyk.

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💜 SEE ALSO

Kernel file ./drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c — go read the source bestie, it's giving lore 📖

• sdma_v6_0_ring_get_rptr(9)
• sdma_v6_0_ring_get_wptr(9)
• sdma_v6_0_ring_set_wptr(9)
• sdma_v6_0_ring_emit_mem_sync(9)
• sdma_v6_0_ring_emit_hdp_flush(9)
• sdma_v6_0_ring_emit_fence(9)
• sdma_v6_0_gfx_stop(9)
• sdma_v6_0_rlc_stop(9)
• sdma_v6_0_ctxempty_int_enable(9)
• sdma_v6_0_enable(9)
• sdma_v6_0_gfx_resume_instance(9)
• sdma_v6_0_gfx_resume(9)
• sdma_v6_0_rlc_resume(9)
• sdma_v6_0_load_microcode(9)
• sdma_v6_0_start(9)
• sdma_v6_0_ring_test_ring(9)
• sdma_v6_0_vm_copy_pte(9)
• sdma_v6_0_vm_write_pte(9)
• sdma_v6_0_vm_set_pte_pde(9)
• sdma_v6_0_ring_emit_pipeline_sync(9)
• sdma_v6_0_ring_emit_fence(9)... wait no, we already did that one 🙈 — anyway, sdma_v6_0_ring_emit_pipeline_sync(9) and
• sdma_v6_0_emit_fill_buffer(9) 💫

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and that's the whole page bestie, no notes 💅

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okayyy sign-off time 🎀 this lil masterpiece lives in ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's literally sdma_v6_0_emit_copy_buffer(9) — periodt 💖✨🦋