pci_scan_slot(9)

🎀 pci_scan_slot — from the Kernel API Manual, bestie 💅

Okay so picture this: you're deep in the kernel, you've got a PCI bus, and you need to know what's living in one specific slot. That's literally this function's whole job. Let's get into it ✨

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🌸 NAME 🌸

pci_scan_slot — scan a PCI slot on a bus for devices 🦋

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✨ SYNOPSIS ✨

int pci_scan_slot (struct pci_bus *bus , int devfn );

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💖 ARGUMENTS 💖

• bus — the PCI bus you wanna scan, bestie 🌈
• devfn — the slot number to scan, and heads up: it must have zero function 👑 (yes, that's a requirement, not a vibe suggestion)

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🫶 DESCRIPTION 🫶

So what it does is: scan a PCI slot on the specified PCI bus for devices, and every device it discovers gets added to the bus->devices list. Iconic. 💅

Lowkey important: new devices will not have is_added set. Not me pointing that out so you don't get caught out later 😭

And the return value? The number of new devices found. That's it, that's the tea ☕✨

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🧚 SEE ALSO 🧚

Kernel file ./drivers/pci/probe.c, plus these absolute legends:

• __pci_size_bars(9)
• __pci_read_base(9)
• pcie_get_link_speed(9)
• pci_ea_fixed_busnrs(9)
• pci_ext_cfg_is_aliased(9)
• pci_cfg_space_size_ext(9)
• pci_intx_mask_broken(9)
• pci_setup_device(9)
• pcie_relaxed_ordering_enabled(9)
• pci_release_dev(9)
• pci_scan_child_bus_extend(9)
• pci_scan_child_bus(9)
• pcibios_root_bridge_prepare(9)
• pci_rescan_bus_bridge_resize(9)
• pci_rescan_bus(9)

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And that's the whole page, bestie 🍓 This lil masterpiece lives in ./drivers/pci, dated October 2026 — go forth and scan those slots, you've got this fr fr 💜⭐