cz_ih_get_wptr(9)

💖 cz_ih_get_wptr(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes that's the manual name, and yes it's giving "official but make it cute" ✨ this one's a little function from the AMDGPU crew and honestly? iconic.

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🌸 NAME 🌸

cz_ih_get_wptr — get the IH ring buffer wptr

like, it literally goes and fetches the write pointer. that's the whole job. main character energy tbh 💅

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✨ SYNOPSIS ✨

u32 cz_ih_get_wptr (struct amdgpu_device *adev , struct amdgpu_ih_ring
*ih );

copy it exactly, no cap — that's the signature, spacing and all 🫶

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🎀 ARGUMENTS 🎀

• adev — an amdgpu_device pointer. the device, the whole device, nothing but the device 💜
• ih — the IH ring buffer we're pulling the wptr out of. yeah. that one. 🦋

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🔥 DESCRIPTION 🔥

so basically: get the IH ring buffer wptr from either the register or the writeback memory buffer (VI). like, two sources, one pointer, slay 🌈

it also checks for ring buffer overflow and deals with it — so if things go sideways, it handles the situation, no dramatic meltdown 😭

used by cz_irq_process(VI). and it returns the value of the wptr — that's the whole point, that's the payoff, that's the moment 👑

heads up bestie: the "either register or writeback memory buffer (VI)" part is literally how it's written — don't @ me, I just report the facts 💀

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/gpu/drm/amd/amdgpu/cz_ih.c 🍓
• cz_ih_enable_interrupts(9)
• cz_ih_disable_interrupts(9)
• cz_ih_irq_init(9)
• cz_ih_irq_disable(9)
• cz_ih_decode_iv(9)
• cz_ih_set_rptr(9)

go read them, they're all friends of ours fr fr 💖

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and that's a wrap, bestie 🫶 this little love letter lives in ./drivers/gpu/drm/amd/amdgpu and it's dated October 2026 — so yes, we're being iconic ahead of schedule 💅⭐ bye!! 🌸