pci_epc_raise_irq(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_epc_raise_irq(9) — Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the kernel, you're in pci_epc_raise_irq, and you need to actually get the host's attention. That's the whole vibe of this page, from the Kernel API Manual fr fr ✨

🌸 NAME 🌸

pci_epc_raise_irq — interrupt the host system. that's it, that's the girl 💅

✨ SYNOPSIS ✨

int pci_epc_raise_irq (struct pci_epc *epc , u8 func_no , u8 vfunc_no ,
unsigned int type , u16 interrupt_num );

she takes five args and returns an int, no cap 🫶

🦋 ARGUMENTS 🦋

  • epc — the EPC device that has to interrupt the host. she's the main character here, everything happens through her 👑
  • func_no — the physical endpoint function number inside the EPC device. like, the physical one. u8. not the vibe-y fake one 🌈
  • vfunc_no — the virtual endpoint function number, the one living inside the physical function. nesting doll energy 🎀 it's a u8 too
  • type — you gotta specify which interrupt flavor you want: INTX, MSI or MSI-X. yes those are the three, pick one, be decisive 💀
  • interrupt_num — the MSI or MSI-X interrupt number, and the range is literally (1-N). a u16. don't come at it with a 0, that's not the assignment 🙈

💖 DESCRIPTION 💖

Invoke this to raise an INTX, MSI or MSI-X interrupt. that's the whole thing — you call it, the host gets interrupted, everybody claps ✨🔥 like honestly? iconic. short. effective. no notes.

🧚 SEE ALSO 🧚

the kernel file to go stare at is ./drivers/pci/endpoint/pci-epc-core.c — go read her, she's the source of truth 📖💜

and here's the whole friend group, alphabetically-ish adjacent, a whole squad of (9) pages:

all of them. yes all 33. i counted, bestie, don't worry 💅✨

heads up: interrupt_num only makes sense for the MSI and MSI-X types, and it's (1-N) — that range is doing the heavy lifting, so respect it 🫶

and that's the page! 🎀 this little beauty lives in ./drivers/pci/endpoint and the version stamp on her says October 2026 — so mark your calendar, she's from the future fr fr ⭐💜 mwah, go interrupt something, love u bye 💖🦋

📦 where this page comes from