iowait_sdma_drain(9)

📦 version 7.3.1, in nixpkgs unstable

💅 iowait_sdma_drain (9) — Kernel API Manual ✨

okay so bestie, welcome to the <pink>kernel API manual</pink> 🎀 and today's main character is literally iowait_sdma_drain. no cap, she's doing one job and doing it well.

🌸 NAME 🌸

iowait_sdma_drain — wait for DMAs to drain 🫶

like... you just sit there and wait for the DMAs to finish. that's the whole vibe check.

✨ SYNOPSIS ✨

void iowait_sdma_drain (struct iowait *wait );

that's it. that's the signature. void return, one arg, no drama 💜

🦋 ARGUMENTS 🦋

  • wait — the iowait structure 🧚 like, hand her the iowait struct and she'll take it from there.

🔥 DESCRIPTION 🔥

so basically this function will delay until the iowait sdmas have completed 💀 it's giving "hold my hand and wait for the DMA queue to chill". literally it just blocks/delays until those sdmas are done, periodt. 🌈

no fancy return value, no sneaky side quests described here — just the waiting.

👑 SEE ALSO 👑

Kernel file ./drivers/infiniband/hw/hfi1/iowait.h and the whole little friend group 💖:

./drivers/infiniband/hw/hfi1 — October 2026 🎀 that's the source/version and date bestie, mwah, ily, go drain those DMAs 💅✨🦋

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