cik_sdma_ctx_switch_enable(9)

💅 cik_sdma_ctx_switch_enable(9) 💅

okay so bestie, we're in the Kernel API Manual today and this one is a little function with a big job 🫶

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✨ NAME ✨

cik_sdma_ctx_switch_enable — literally turns the sdma engine preemption on and off, no cap 🎀

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🌸 SYNOPSIS 🌸

void cik_sdma_ctx_switch_enable (struct radeon_device *rdev , bool enable );

like, that's it. that's the whole vibe. 💜

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🦋 ARGUMENTS 🦋

• rdev — a radeon_device pointer, i.e. your little handle on the radeon device ✨
• enable — flip preemption on or off. that's the whole switch, bestie 🎚️

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🔥 DESCRIPTION 🔥

it halts — or unhalts — the async dma engines. on CIK. that's the entire plot 🎬

like, the function is literally the pause/play button for those engines, and honestly? iconic.

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👑 SEE ALSO 👑

the kernel file it lives in is ./drivers/gpu/drm/radeon/cik_sdma.c — and here's the whole friend group fr fr:

• 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_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_copy_dma(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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bestie this page ships out of ./drivers/gpu/drm/radeon and it's dated October 2026 — so yeah, from the future, slay 💀✨ bye, ily, go halt some engines 🧚‍♀️💖