cik_sdma_ring_test_ib(9)

💅 cik_sdma_ring_test_ib(9) — like, the Kernel API Manual, bestie ✨

okay so real talk, this is a page from the Kernel API Manual and it's about one (1) tiny little function that goes "hey bestie, does this IB actually work on the DMA engine?" 🎀

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🌸 NAME 🌸

cik_sdma_ring_test_ib — test an IB on the DMA engine, no cap 🔥

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✨ SYNOPSIS ✨

int cik_sdma_ring_test_ib (struct amdgpu_ring *ring , long timeout );

like… that's it. that's the whole vibe check. 🦋

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🫶 ARGUMENTS 🫶

• ring — the amdgpu_ring structure holding ring information 💖 like it literally holds the ring info, that's its whole job, iconic behavior honestly
• timeout — timeout value in jiffies, or MAX_SCHEDULE_TIMEOUT ⏳ (yes the all-caps one means "wait basically forever", iykyk)

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👑 DESCRIPTION 👑

Test a simple IB in the DMA ring (CIK). 🧚 Returns 0 on success, error on failure. that's it. that's the whole function. short queen behavior periodt 💅✨

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🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/gpu/drm/amd/amdgpu/cik_sdma.c 📁 and honestly the whole friend group is here:

• cik_sdma_init_microcode(9)
• cik_sdma_ring_get_rptr(9)
• cik_sdma_ring_get_wptr(9)
• cik_sdma_ring_set_wptr(9)
• cik_sdma_ring_emit_ib(9)
• cik_sdma_ring_emit_hdp_flush(9)
• cik_sdma_ring_emit_fence(9)
• cik_sdma_gfx_stop(9)
• cik_sdma_rlc_stop(9)
• cik_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_start(9)
• cik_sdma_ring_test_ring(9)
• cik_sdma_vm_copy_pte(9)
• cik_sdma_vm_write_pte(9)
• cik_sdma_vm_set_pte_pde(9)
• cik_sdma_ring_pad_ib(9)
• cik_sdma_ring_emit_pipeline_sync(9)
• cik_sdma_ring_emit_vm_flush(9)
• cik_sdma_emit_copy_buffer(9)
• cik_sdma_emit_fill_buffer(9)

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mwah 💋 this page came from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it answers to the name cik_sdma_ring_test_ib(9) — slay, go test some IBs bestie 🎀💜