pci_msi_get_device_domain(9)

💅 pci_msi_get_device_domain(9) 💅

okay bestie, welcome to the Kernel API Manual page for pci_msi_get_device_domain(9) — it's short, it's sweet, and it's literally all about finding the right MSI domain for a PCI device. no cap. 🎀

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✨ NAME ✨

pci_msi_get_device_domain — get the MSI domain for a given PCI device 💖

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🌸 SYNOPSIS 🌸

struct irq_domain * pci_msi_get_device_domain (struct pci_dev *pdev );

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🦋 ARGUMENTS 🦋

• pdev — the PCI device. that's the one, bestie. 💅

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🌈 DESCRIPTION 🌈

so what this does is use the firmware data to find a device-specific MSI domain — meaning it's not one that's set as a default. iykyk. ✨

like, it's giving “look at the firmware, find the special domain for this device” energy. not the default one. the device-specific one. periodt. 💜

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⭐ RETURN ⭐

it returns the corresponding MSI domain, or NULL if none has been found. that's it. that's the whole return vibe. 😭🫶

lowkey important: NULL means “none found,” so don't go dereferencing it like it's main character energy when it's literally nothing. 💀

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👑 SEE ALSO 👑

• Kernel file ./drivers/pci/msi/irqdomain.c
• pci_msi_domain_write_msg(9)
• pci_setup_msi_device_domain(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)

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and that's the whole page, bestie 🧚💖 — source/version is ./drivers/pci/msi, dated October 2026, and yes it ate. slay. 💅✨