amdgpu_userq...ce_read_wptr(9)

🌸 amdgpu_userq_fence_read_wptr(9) — the Kernel API Manual glow-up ✨

okay so bestie, we're deep in the Kernel API Manual today and this one is a little cutie from the amdgpu world 💅 it lives over in ./drivers/gpu/drm/amd/amdgpu and honestly? it's giving "small function, big responsibility" energy.

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✨ NAME ✨

amdgpu_userq_fence_read_wptr — bestie, it literally reads the userq wptr value 🎀 that's the whole gig, no cap.

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🦋 SYNOPSIS 🦋

int amdgpu_userq_fence_read_wptr (struct amdgpu_device *adev , struct amdgpu_usermode_queue *queue , u64 *wptr );

like, three args, one int coming back at you, iconic ⭐

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🎀 ARGUMENTS 🎀

• adev — the amdgpu_device pointer, aka the whole device vibe check 🖥️
• queue — pointer to the user mode queue structure, she's the main character here 👑
• wptr — the write pointer value, that's what we're here for fr fr 🍓

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💖 DESCRIPTION 💖

So what she actually does: she reads the wptr value from the userq's MQD 📖✨

And the context, because iykyk — the userq signal IOCTL creates a dma_fence for the shared buffers, and that fence expects the RPTR value written to seq64 memory to be >= WPTR 🫶 like that's the condition, that's the whole situation.

Returns the wptr value on success, and an error on failure 😭 (as is tradition).

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🌈 SEE ALSO 🌈

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c — go read her, she's right there 💜

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ok that's the whole page, no skips, no summarising, we ate and left zero crumbs 🍽️✨

and a lil sign-off because you deserve it: this one comes from ./drivers/gpu/drm/amd/amdgpu, dated October 2026 🌸 mwah, go read some fences 🧚‍♀️💫