pci_set_mwi(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

pci_set_mwi — enables memory-write-invalidate PCI transaction.

okay bestie, this is the pci_set_mwi(9) page from the Kernel API Manual, and it's literally the "turn on MWI" moment for a PCI device. 🎀

✨ SYNOPSIS ✨

int pci_set_mwi (struct pci_dev *dev );

🫶 ARGUMENTS 🫶

  • dev — the PCI device for which MWI is enabled. Like, this is the device getting the MWI glow-up. 💅

🌸 DESCRIPTION 🌸

okay so the actual description is short and iconic: it enables the Memory-Write-Invalidate transaction in PCI_COMMAND. That's it. That's the whole vibe. No cap, no extra lore. ✨

💖 RETURN 💖

It returns an appropriate -ERRNO error value on error, or zero for success. So bestie, zero is the slay result, and -ERRNO is the "something went wrong" result. That's the whole return contract. 🫶

👑 SEE ALSO 👑

The kernel file is ./drivers/pci/pci.c — that's the source-file reference, bestie. And here is the full see-also friend group, every single one, no gatekeeping:

okay that's the whole page, bestie — source/version: ./drivers/pci, date: October 2026. byeee, go enable that MWI with main character energy 🎀💅✨

📦 where this page comes from