uvd_v4_2_ring_set_wptr(9)

💅 uvd_v4_2_ring_set_wptr(9) ✨

okay so bestie, this is a page from the Kernel API Manual (the (9) section, very kernel-internals of it) and honestly? It's a little one, but she's important. Let's get into it.

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🎀 NAME 🎀

uvd_v4_2_ring_set_wptr — set write pointer

like. literally the function that sets the write pointer. that's the whole job. iconic behavior honestly 🌸

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✨ SYNOPSIS ✨

void uvd_v4_2_ring_set_wptr (struct amdgpu_ring *ring );

so she takes one thing, returns nothing (void, she gives nothing back and she doesn't need to 💅), lowercase void, capital-S struct amdgpu_ring pointer named ring. that's the whole signature, no cap.

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🦋 ARGUMENTS 🦋

• ring — an amdgpu_ring pointer. that's it. that's the whole parameter list. one (1) ring, handed over, ready to go 🫶

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🔥 DESCRIPTION 🔥

Commits the write pointer to the hardware.

that's the entire description, and honestly same girl. she takes the write pointer and she commits it — to the actual hardware, for real, fr fr. no return value, no error checking to talk about here, just pure "make it so" main character energy 👑

ngl this is a short description but that's genuinely all it says — don't go reading extra behavior into it, bestie. the page doesn't claim anything more than "commits the write pointer to the hardware."

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💜 SEE ALSO 💜

• the kernel file itself: ./drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c — go read the source, iykyk 🍓
• uvd_v4_2_ring_get_rptr(9)
• uvd_v4_2_ring_get_wptr(9) — yes, the sibling. she gets, this one sets. balance ✨
• uvd_v4_2_hw_init(9)
• uvd_v4_2_hw_fini(9)
• uvd_v4_2_start(9)
• uvd_v4_2_stop(9)
• uvd_v4_2_ring_emit_fence(9)
• uvd_v4_2_ring_test_ring(9)
• uvd_v4_2_ring_emit_ib(9)
• uvd_v4_2_mc_resume(9)

all of them live in ./drivers/gpu/drm/amd/amdgpu, the whole little uvd_v4_2 family reunion 🌈

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and that's the page!! 💖 cute little sign-off: this is from the source ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and the manual entry is uvd_v4_2_ring_set_wptr(9) — same as the title up top, you're not crazy 🧚