mv_qc_issue_fis(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mv_qc_issue_fis(9) — Kernel API Manual ✨

okay so bestie, welcome to the glow-up of the mv_qc_issue_fis page from the Kernel API Manual — this one's a whole saga about firing off a command straight up as a FIS, and it's lowkey spicy 🌶️

🌸 NAME 🌸

mv_qc_issue_fis — issue a command directly as a FIS, no cap 💅

🦋 SYNOPSIS 🦋

unsigned int mv_qc_issue_fis (struct ata_queued_cmd *qc );

🎀 ARGUMENTS 🎀

  • qc — the queued command you're about to start, bestie. it's giving "this is the one we're sending" energy ✨

💖 DESCRIPTION 💖

okay so first thing you gotta know: the ATA shadow registers do not get updated after the command is issued. ngl that's kind of a big deal — it means if something polls the device, it'll look "READY", even while the device is literally BUSY processing the command 😭 like girl, read the room.

so the way we handle that? we use a status hook to fake ATA_BUSY until the drive actually changes state. iconic workaround tbh 🫶

⚠️ NOTE ⚠️

🚨 plot twist: we don't get updated shadow regs on completion of non-data commands. so pls pls avoid sending them via this function — they'll appear to have completed immediately, which is a whole lie and you'll get played 💀

and about GEN_IIE — it has special registers that we could get the result tf from, but the earlier chipsets simply do not have them. for now, we ignore those registers. periodt. 🙈

🔥 SEE ALSO 🔥

kernel file ./drivers/ata/sata_mv.c, plus the whole friend group:

and that's the whole page, bestie — slay 💅✨

sign-off szn 🎀: this lil masterpiece lives in ./drivers/ata, dated October 2026. mwah, drink water, go touch some registers 💖

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