pci_resource_is_io(9)

💅 pci_resource_is_io(9) 💅

okay so bestie, welcome to the pci_resource_is_io(9) page from the Kernel API Manual — yes it's a kernel function, no it's not scary, i promise 🫶 it's literally one of the chillest little helpers in the PCI part of the tree and we're gonna get you comfy with it in like thirty seconds, fr fr.

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✨ NAME ✨

pci_resource_is_io — check if a PCI resource is of I/O port type. that's it. that's the whole job. she's a one-trick pony and she's iconic for it 💅

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🌸 SYNOPSIS 🌸

bool pci_resource_is_io (const struct pci_dev *dev , int resno );

look at her. look at that signature. so clean, so simple, so giving "i know exactly what i am" ✨

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🎀 ARGUMENTS 🎀

• dev — the PCI device to check. like, hand her the device and she'll go look at its resources for you, no cap 🦋
• resno — the resource number (BAR index) to check. that's the BAR index bestie, so she knows which resource you're asking about 👑

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💖 DESCRIPTION 💖

Returns true if the resource type is I/O port.

that's it. that's the description. she looks at the resource, she sees it's I/O port type, she hits you with a true. not an I/O port? no true for you 🙈 the function name literally tells you what it does — lowkey the most honest function in the kernel, i'm obsessed 😭

side note bestie: this one is a straight-up yes/no vibe check on the resource type — don't go reading extra meaning into it, she's not doing anything else for you 💀

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🌈 SEE ALSO 🌈

the whole friend group, and yes they all get to show up in the list, every single one, because we don't do half-finished SEE ALSO sections in this house 💜

• 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_irq_type(9)
• pci_irqd_intx_xlate(9)
• pci_resource_is_mem(9) — her sibling!! the memory-type counterpart, go say hi 🧚
• 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)

and where does she live? kernel file ./include/linux/pci.h obviously — that's the address, that's the home base 🏠

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okay that's the whole page, you slayed it, go check some BARs 💅✨ this lil sign-off comes to you from ./include/linux, dated October 2026, and yes the manual name is pci_resource_is_io(9) — mwah, bye bestie 🎀🦋💖