pci_is_vga(9)

💅 pci_is_vga — the kernel-API-manual page, but make it make sense

okay bestie, quick vibe check: this is pci_is_vga(9) from the Kernel API Manual, and it's genuinely a tiny little function that does one (1) job. let's get into it 💖

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✨ NAME ✨

pci_is_vga — check if the PCI device is a VGA device 🖥️✨

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🌸 SYNOPSIS 🌸

bool pci_is_vga (struct pci_dev *pdev );

like. that's it. that's the whole function signature. she's short and she knows it 💅

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🎀 ARGUMENTS 🎀

• pdev — the PCI device 🫶 (the thing you're asking "hey are you a VGA device" about)

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🦋 DESCRIPTION 🦋

okay so bestie, here's the lore 📖. The PCI Code and ID Assignment spec, r1.15, secs 1.4 and 1.1 is out here defining the VGA Base Class and Sub-Classes, and the icons that matter are literally these:

03 00  PCI_CLASS_DISPLAY_VGA      VGA-compatible or 8514-compatible 00
01  PCI_CLASS_NOT_DEFINED_VGA  VGA-compatible (before Class Code)

so the function returns true if the PCI device is a VGA device and uses the legacy VGA resources — which are, no cap, exactly these:

• [mem 0xa0000-0xbffff]
• [io 0x3b0-0x3bb]
• [io 0x3c0-0x3df]
• and aliases ✨

that's the whole check. legacy vibes only, fr fr 🔥

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🌈 SEE ALSO 🌈

the whole friend group, in the order they showed up at the function — under Kernel file ./include/linux/pci.h:

• enum pci_interrupt_pin(9)
• pci_channel_state_t(9)
• pci_is_bridge(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_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)

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and that's the page, bestie! 🫶 source is ./include/linux, dated October 2026, version pci_is_vga(9) — go off, icon 👑✨💜