cayman_dma_set_wptr(9)

💅 cayman_dma_set_wptr — bestie's guide to the header file cayman_dma_set_wptr(9) from the Kernel API Manual ✨

okay so this is cayman_dma_set_wptr, she's a kernel API function living in the 9 section of the manual, and honestly? she's short, she's sweet, she does exactly one thing. main character energy but make it minimal 🎀

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🌸 NAME 🌸

cayman_dma_set_wptr — commit the write pointer 💖

that's it. that's the whole job. she commits the wptr. iconic.

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✨ SYNOPSIS ✨

void cayman_dma_set_wptr (struct radeon_device *rdev , struct
radeon_ring *ring );

no cap, that's the whole signature — returns void, so she doesn't even give you a value back. she just does the thing and dips 🦋

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💜 ARGUMENTS 💜

• rdev — a radeon_device pointer 🫶 (yep, the big device struct, you know her)
• ring — a radeon_ring pointer 💅 (the ring in question, obvs)

two pointers, that's the whole guest list. short and slay.

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🔥 DESCRIPTION 🔥

so what does she actually do? she writes the wptr back to the hardware 💀 and this is specifically for cayman+ — the plus is load-bearing, iykyk ⭐

like, that's genuinely the entire description. no hidden lore, no edge cases listed, no surprises. just wptr → hardware. periodt. 👑

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🌈 SEE ALSO 🌈

okay this is where the friend group shows up — the whole squad lives in the kernel file ./drivers/gpu/drm/radeon/ni_dma.c, and honestly they all ate:

• cayman_dma_get_rptr(9) — the getter twin of the read pointer, bestie behaviour 💖
• cayman_dma_get_wptr(9) — the other getter, the wptr one, she's the mirror 🪞
• cayman_dma_ring_ib_execute(9) — executes the ring IB, she's busy 💅
• cayman_dma_stop(9) — stopping things 🛑
• cayman_dma_resume(9) — and picking them back up 🌸
• cayman_dma_fini(9) — the fini era 😭
• cayman_dma_is_lockup(9) — the vibe check for lockups 💀
• cayman_dma_vm_copy_pages(9) — vm page-copying duties 🦋
• cayman_dma_vm_write_pages(9) — vm page-writing duties ✨
• cayman_dma_vm_set_pages(9) — vm page-setting duties 🧚
• cayman_dma_vm_pad_ib(9) — the padding one, lowkey underrated 🎀

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💡 friendly reminder: every one of these references is a (9) page, so if you wanna know more, that's where you go. no guessing, no extrapolating from this page alone — she's a one-liner and she owns it 🙈

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mwah 💋 that's the page! this lil writeup comes to you straight from the source tree at ./drivers/gpu/drm/radeon, dated October 2026, and the page itself is literally titled cayman_dma_set_wptr(9) (the title and the manual name, together forever). stay slay, stay committed to the write pointer 🫶💖✨