cik_copy_dma(9)

💅 cik_copy_dma — a kernel API manual moment

okay so bestie, welcome to cik_copy_dma(9), straight out of the Kernel API Manual ✨ she's a kernel function, she's a lil niche, and honestly? she eats. let's get into it 🫶

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🌸 NAME 🌸

cik_copy_dma — copy pages using the DMA engine 💫 like literally that's her whole job and she does it gorgeously

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✨ SYNOPSIS ✨

struct radeon_fence * cik_copy_dma (struct radeon_device *rdev ,
uint64_t src_offset , uint64_t dst_offset , unsigned num_gpu_pages ,
struct dma_resv *resv );

no cap, that's the whole signature — copy it exactly if you're typing it out, i'm not about to let you typo your way through this 💀

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🎀 ARGUMENTS 🎀

• rdev — a radeon_device pointer, aka the whole device vibe check 👑
• src_offset — the src GPU address, like where the tea is coming from 🦋
• dst_offset — the dst GPU address, aka where it's all going 🍓
• num_gpu_pages — number of GPU pages to xfer, so like… count your pages bestie 🔢
• resv — reservation object to sync to, the lil sync icon of the whole operation ⭐

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💖 DESCRIPTION 💖

so basically she copies GPU paging using the DMA engine (CIK) ✨ the way that she's literally the one doing the heavy lifting…

she's used by the radeon ttm implementation to move pages — but only if she's registered as the asic copy callback. iykyk 😌 it's giving "i'm on the callback list or i'm not showing up" energy, periodt.

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🌈 SEE ALSO 🌈

kernel file ./drivers/gpu/drm/radeon/cik_sdma.c and her entire friend group, fr fr — every single one of them, no skipping:

• cik_sdma_get_rptr(9)
• cik_sdma_get_wptr(9)
• cik_sdma_set_wptr(9)
• cik_sdma_ring_ib_execute(9)
• cik_sdma_hdp_flush_ring_emit(9)
• cik_sdma_fence_ring_emit(9)
• cik_sdma_semaphore_ring_emit(9)
• cik_sdma_gfx_stop(9)
• cik_sdma_rlc_stop(9)
• cik_sdma_ctx_switch_enable(9)
• cik_sdma_enable(9)
• cik_sdma_gfx_resume(9)
• cik_sdma_rlc_resume(9)
• cik_sdma_load_microcode(9)
• cik_sdma_resume(9)
• cik_sdma_fini(9)
• cik_sdma_ring_test(9)
• cik_sdma_ib_test(9)
• cik_sdma_is_lockup(9)
• cik_sdma_vm_copy_pages(9)
• cik_sdma_vm_write_pages(9)
• cik_sdma_vm_set_pages(9)
• cik_sdma_vm_pad_ib(9)

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ngl bestie, that's a lot of SEE ALSOs — but that's the whole squad and we don't cut the squad 💜

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and that's the page!! 🧚 mwah 💋

sign-off time: this lil masterpiece lives at ./drivers/gpu/drm/radeon, it's dated October 2026, and yes she's still cik_copy_dma(9) — iconic behavior, we love to see it 🔥👑