pci_setup_ms...evice_domain(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_setup_ms...evice_domain(9)

okay so this is a page straight out of the Kernel API Manual bestie, and ngl it's a cute little one — it's all about pci_setup_msix_device_domain and it's fr fr just here to help you set up a device MSI-X interrupt domain. lowkey iconic behavior. 🎀

✨ NAME ✨

pci_setup_msix_device_domain — Setup a device MSI-X interrupt domain 🦋

🌸 SYNOPSIS 🌸

bool pci_setup_msix_device_domain (struct pci_dev *pdev , unsigned int
hwsize );

yeah that's the whole vibe. two args, one bool back. slay.

🫶 ARGUMENTS 🫶

  • pdev — the PCI device you're creating the domain on 💖 like, this is the device, the main character
  • hwsize — the size of the MSI-X vector table ✨ that's it, that's the number

🔥 RETURN 🔥

It hands back True when:

  • The device does not have a MSI parent irq domain associated — which keeps the legacy architecture specific and the global PCI/MSI domain models working 💀 (yes, that's a whole mouthful but it's important, don't skip it)
  • The MSI-X domain exists already 👑
  • The MSI-X domain was successfully allocated 🎉

And it gives you False when:

  • MSI is enabled 🙈
  • The domain creation fails 😭
no cap, False isn't automatically "you did something wrong" — it's just the function telling you the vibe check failed for one of those two reasons.

🧚 DESCRIPTION 🧚

So here's the tea: the MSI-X domain that gets created is preserved until one of these two things happens:

  • The device is removed 💅
  • MSI-X is disabled and a MSI domain is created 🌀

that's the whole lifecycle bestie, it's giving "till death do us part but the death is a device removal." 🌈

⭐ SEE ALSO ⭐

Kernel file ./drivers/pci/msi/irqdomain.c — go read it iykyk 🍓

and that's the page!! 🦋 this one lives over in ./drivers/pci/msi and it's dated October 2026 — so yeah, mark your calendar bestie, mwah 💜 👑

📦 where this page comes from