pci_bus_for_each_resource(9)

💅 pci_bus_for_each_resource(9) — Kernel API Manual, bestie edition ✨

okay so this is a page from the Kernel API Manual, and it's literally about looping over PCI bus resources. it's giving "for loop but make it kernel" and honestly? we're obsessed. 🎀

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🌸 NAME 🌸

pci_bus_for_each_resource — iterate over PCI bus resources 💖

⭐ SYNOPSIS ⭐

pci_bus_for_each_resource (bus , res , ... );

🦋 ARGUMENTS 🦋

• bus — the PCI bus. like, the whole vibe you're walking through 🚌
• res — pointer to the current resource. this is your main character pointer, it moves as you iterate 👑
• ... — optional index of the current resource. yes optional, yes it's a whole thing ✨

💜 DESCRIPTION 💜

so the way this works: you iterate over PCI bus resources. the first part is to go over the PCI bus resource array — and that array has at most the PCI_BRIDGE_RESOURCE_NUM entries. no cap, at most. 🫶

after that, you continue with the separate list of the additional resources, if not empty. that's why the Logical OR is being used. iykyk 😭 the || is doing heavy lifting ok

possible usage:

struct pci_bus *bus = ...; struct resource *res; unsigned int i;

// With optional index pci_bus_for_each_resource(bus, res, i)
pr_info("PCI bus resource[u]: pR0, i, res);

// Without index pci_bus_for_each_resource(bus, res)
_do_something_(res);

so cute, so clean, so iconic. copy it exactly, don't come for me about the formatting, that's how the page has it 💅

🔥 SEE ALSO 🔥

• Kernel file ./include/linux/pci.h — yes, the header, go read it bestie 🌈
• 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)
• module_pci_driver(9)
• builtin_pci_driver(9)
• pci_irq_type(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)

like, that's the whole friend group, all 32 of them, slay 🧚 ✨

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heads up bestie: this was shipped from ./include/linux, dated October 2026, and it's page pci_bus_for_each_resource(9) of the Kernel API Manual. periodt. 💀 🌸 🍓 💖