cayman_dma_is_lockup(9)

✨ NAME ✨

cayman_dma_is_lockup — the little function that checks if your DMA engine is straight-up stuck, bestie 💅 the manual name is Kernel API Manual, iykyk 🎀

🦋 SYNOPSIS 🦋

bool cayman_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring);

🌸 ARGUMENTS 🌸

• rdev — okay so this is your radeon_device pointer. like, the whole graphics device vibe check in one pointer 🫶
• ring — and this is the radeon_ring structure holding ring information. literally the ring's whole personality and info, no cap 💖

🎀 DESCRIPTION 🎀

So basically this function checks if the async DMA engine is locked up. Like, is it ghosting us? Is it giving absolutely nothing? 👀 It returns true if the engine appears to be locked up, and false if it's not. Periodt — that's the whole function, and it ate 💅

ngl bestie, if this comes back true, your DMA engine is not okay. it's giving stuck. it's giving frozen. it's giving send help 😭

💜 SEE ALSO 💜

The whole squad, fr fr — these are all in the kernel file ./drivers/gpu/drm/radeon/ni_dma.c and they're iconic:

• cayman_dma_get_rptr(9) — gets the read pointer, slay 🦋
• cayman_dma_get_wptr(9) — gets the write pointer, another queen 👑
• cayman_dma_set_wptr(9) — sets the write pointer, main character energy ✨
• cayman_dma_ring_ib_execute(9) — executes ring IB stuff, very demure 💅
• cayman_dma_stop(9) — stops it, not me being dramatic but bye 💀
• cayman_dma_resume(9) — resumes it, welcome back bestie 🌈
• cayman_dma_fini(9) — finishes it up, wrapping it like a gift 🎁
• cayman_dma_vm_copy_pages(9) — copies VM pages, lowkey important 🍓
• cayman_dma_vm_write_pages(9) — writes VM pages, highkey essential 💖
• cayman_dma_vm_set_pages(9) — sets VM pages, she's serving 🌸
• cayman_dma_vm_pad_ib(9) — pads the IB, iconic padding honestly 🧚

💫 this page came from the ./drivers/gpu/drm/radeon source files, dated October 2026 — shoutout to whoever wrote it, you're a real one 🫶✨