force_update...for_self_int(9)

📦 version 7.3.1, in nixpkgs unstable

💅 force_update...for_self_int — Kernel API Manual ✨

ok so bestie, today we're talking about force_update_wptr_for_self_int(9) — that's the section-9 kernel API page, and honestly it's giving "niche GPU lore" and I'm kinda obsessed?? 🫶

🌸 NAME 🌸

force_update_wptr_for_self_int — literally forces an update of the wptr for self interrupt. that's it, that's the whole vibe 💫

🎀 SYNOPSIS 🎀

void force_update_wptr_for_self_int (struct amdgpu_device *adev , u32
threshold , u32 timeout , bool enabled );

^^ copy that exactly, no cap, every type and every arg name stays untouched 🙈

🦋 ARGUMENTS 🦋

  • adev — the amdgpu_device pointer. your main character struct, the whole device lives here 👑
  • threshold — the threshold that triggers the wptr reporting ✨
  • timeout — the timeout that triggers the wptr reporting ⏳
  • enabled — enable or disable the timeout flush mechanism. yes it's a bool, yes it's that simple, slay 🔥

🌈 DESCRIPTION 🌈

okay so here are the deets, and these matter, so no skimming bestie 😭

threshold input range is 0 ~ 15, and the default is 0. the real value you actually get is:

real_threshold = 2^threshold

timeout input range is 0 ~ 20, and the default is 8. the real value works out to:

real_timeout = (2^timeout) * 1024 / (socclk_freq)
notice that one's doing math with socclk_freq — that's the SoC clock frequency, and it's just sitting there in the formula, do not come for it 💀

and what does the whole thing do? it force updates the wptr for self interrupt 🌟

also: this applies to >= SIENNA_CICHLID — so like, Sienna Cichlid and newer, periodt. older hardware, this is not your era 🙅‍♀️

💖 SEE ALSO 💖

the kernel file lives at:

./drivers/gpu/drm/amd/amdgpu/navi10_ih.c

and here's the whole friend group, all invited to the function party 🎉:

🧚 and that's the page!! this lil icon came from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's filed under force_update...for_self_int(9). mwah, go read the source bestie 💜

📦 where this page comes from