pci_setup_msi_device_domain(9)

💅 pci_setup_msi_device_domain(9) 💅

okay so bestie, welcome to the Kernel API Manual — this page is literally about pci_setup_msi_device_domain(9), and we're gonna make MSI interrupt domain setup make sense. no cap. 🫶

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✨ NAME ✨

pci_setup_msi_device_domain — Setup a device MSI interrupt domain 💖

🌸 SYNOPSIS 🌸

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

🎀 ARGUMENTS 🎀

• pdev — the PCI device to create the domain on. main character device energy, periodt. 💅
• hwsize — the maximum number of MSI vectors. that's the cap, bestie. ✨

🫶 RETURN 🫶

vibe check time: it returns 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 👑
• the MSI domain exists already
• the MSI domain was successfully allocated

and it returns False when:

• MSI-X is enabled
• the domain creation fails. 😭

🦋 DESCRIPTION 🦋

the created MSI domain is preserved until:

• the device is removed
• MSI is disabled and a MSI-X domain is created

that's the whole lifespan tea, bestie ☕✨

🌈 SEE ALSO 🌈

• Kernel file ./drivers/pci/msi/irqdomain.c
• pci_msi_domain_write_msg(9)
• pci_setup_msix_device_domain(9)
• pci_msi_domain_supports(9)
• pci_msi_domain_get_msi_rid(9)
• pci_msi_map_rid_ctlr_node(9)
• pci_msi_get_device_domain(9)

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mwah 💋 — source/version footer energy is ./drivers/pci/msi · October 2026 · pci_setup_msi_device_domain(9). stay slay, bestie! 🎀🦋