msix_request_irq(9)

📦 version 7.3.1, in nixpkgs unstable

💅 msix_request_irq — the msix_request_irq(9) glow-up

okay so bestie, welcome to the Kernel API Manual entry for msix_request_irq(9), aka the function that literally hands you a free MSIx IRQ and sets it all up. grab a strawberry 🍓, this one's short and sweet.

✨ NAME ✨

msix_request_irq — Allocate a free MSIx IRQ. that's it, that's the vibe. 🎀

🌸 SYNOPSIS 🌸

int msix_request_irq (struct hfi1_devdata *dd , void *arg ,
irq_handler_t handler , irq_handler_t thread , enum irq_type type ,
const char *name );

look at her. six arguments, zero regrets. 💅

🦋 ARGUMENTS 🦋

  • dd — valid devdata. like, it has to be valid, bestie, don't come at her with garbage. 🙈
  • arg — context information for the IRQ. the little bag of lore you're passing along. 🫶
  • handler — IRQ handler. the main character. 👑
  • thread — IRQ thread handler, and yes it could be NULL. no pressure, she's flexible. 😌
  • type — affinty IRQ type. (that's how it's spelled in the original, and we respect the original, periodt.) ⭐
  • name — IRQ name. give her a cute name, she deserves it. 🌸

🔥 DESCRIPTION 🔥

so what does she do? she allocates an MSIx vector if one's available (if not… well, see RETURN, iykyk 👀), and then creates the appropriate meta data needed to keep track of the pci IRQ request. lowkey essential, highkey iconic. the bookkeeping is the whole point, bestie — no meta data, no tracking, no slay. ✨

⭐ RETURN ⭐

  • < 0 — Error 😭
  • >= 0 — MSIx vector 🎉

so like… negative means bad vibes, zero-or-above means you got your vector. vibe check complete. 🦋

🌈 SEE ALSO 🌈

Kernel file ./drivers/infiniband/hw/hfi1/msix.c — go read the source, it's giving main character energy. also go say hi to her friends:

that's the whole group chat right there fr fr. 💜

ngl bestie, the whole squad lives in ./drivers/infiniband/hw/hfi1 — that's the directory, that's the home base. 🧚

and that's a wrap! this lil page came to you from ./drivers/infiniband/hw/hfi1, dated October 2026. mwah 💋 go allocate something iconic. 💖

📦 where this page comes from