pci_irq_type(9)

🎀 pci_irq_type — like, the interrupt-type reveal 💅

Okay bestie, so this one's from the Kernel API Manual (that's the pci_irq_type(9) page, mwah) and it's honestly a little baby page, but she is important so let's give her the respect she deserves. ✨

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🌸 NAME 🌸

pci_irq_type — get the interrupt type of a PCI device. That's it, that's the whole gig, and she does it flawlessly, no cap.

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✨ SYNOPSIS ✨

unsigned int pci_irq_type (struct pci_dev *pdev );

That's the whole function signature, copy-paste vibes, don't touch it, she's perfect. 🫶

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💖 ARGUMENTS 💖

• pdev — the PCI device you wanna operate on. That's your main character right there, the one you're asking about. 💅

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🦋 DESCRIPTION 🦋

So here's the tea ☕ — this function is a little detective. It tells you which kind of interrupt the PCI core went ahead and picked for this device, and it only makes sense to call it after a successful pci_alloc_irq_vectors call. Like, that's the prerequisite, bestie — interrupt vectors got allocated, and now you're allowed to ask "so… which flavour did we get?" 🔍✨

She discriminates the interrupt type. Iconic behaviour, honestly.

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⭐ RETURN ⭐

She hands you back one of these three, and yes, they're literal constants, respect them:

• PCI_IRQ_MSIX
• PCI_IRQ_MSI
• PCI_IRQ_INTX

Three possibilities, no in-between, that's the vibe check and she passes every time. 👑

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🌈 SEE ALSO 🌈

Bestie, buckle up, because the SEE ALSO section is long and we are not skipping a single one of these. Every single name, exactly as written:

• Kernel file ./include/linux/pci.h enum pci_interrupt_pin(9)
• pci_channel_state_t(9)
• pci_is_bridge(9)
• pci_is_vga(9)
• pci_is_display(9)
• struct pci_driver(9)
• PCI_DEVICE(9)
• PCI_DEVICE_DRIVER_OVERRIDE(9)
• PCI_DRIVER_OVERRIDE_DEVICE_VFIO(9)
• PCI_DEVICE_SUB(9)
• PCI_DEVICE_CLASS(9)
• PCI_VDEVICE(9)
• PCI_VDEVICE_SUB(9)
• PCI_DEVICE_DATA(9)
• pcie_capability_clear_and_set_word(9)
• pci_bus_for_each_resource(9)
• module_pci_driver(9)
• builtin_pci_driver(9)
• pci_irqd_intx_xlate(9)
• pci_resource_is_io(9)
• pci_resource_is_mem(9)
• pci_pcie_cap(9)
• pci_is_pcie(9)
• pcie_caps_reg(9)
• pci_pcie_type(9)
• pcie_find_root_port(9)
• pci_vpd_alloc(9)
• pci_vpd_find_id_string(9)
• pci_vpd_find_ro_info_keyword(9)
• pci_vpd_check_csum(9)
• pci_ari_enabled(9)
• pci_is_thunderbolt_attached(9)

That's the whole friend group, and honestly? They all ate. 🍓🧚

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💀 Friendly reminder: ask about the interrupt type after pci_alloc_irq_vectors succeeds. Before that? The question is giving nothing, bestie.

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And that's the page!! 🎀 Signing off from ./include/linux, dated October 2026 — that's the source path and the date, both present and accounted for, because we do not leave details behind in this house. 💜✨ Byeee! 🦋