pci_rebar_set_size(9)

💅 pci_rebar_set_size(9)

okay so this is a page from the Kernel API Manual bestie, and it's all about pci_rebar_set_size — the little function that gives your Resizable BAR a whole new size. glow-up for your BAR, fr fr ✨

🌸 NAME 🌸

pci_rebar_set_size — set a new size for a Resizable BAR

✨ SYNOPSIS ✨

int pci_rebar_set_size (struct pci_dev *pdev , int bar , int size );

🎀 ARGUMENTS 🎀

• pdev — the PCI device, aka the main character 🫶
• bar — which BAR you're setting the size of, pick your fighter
• size — the new size, exactly as defined in the PCIe spec (0=1MB, 31=128TB) — yes literally up to 128TB, no cap 😭

🦋 DESCRIPTION 🦋

Sets the new size of a BAR, as defined in the spec. that's the whole vibe. it just does the thing 💅

🌈 RETURN 🌈

Returns 0 if resizing was successful, or a negative value on error. slay when it's zero, sad girl hours when it's negative 🙈

👑 SEE ALSO 👑

Kernel file ./drivers/pci/rebar.c and honestly the whole rebar friend group:

• pci_rebar_bytes_to_size(9)
• pci_rebar_size_to_bytes(9)
• pci_rebar_find_pos(9)
• pci_rebar_get_possible_sizes(9)
• pci_rebar_size_supported(9)
• pci_rebar_get_max_size(9)
• pci_rebar_get_current_size(9)
• pci_resize_resource(9)

okay that's the whole page, you ate that 🍓 this icon of a manpage lives in ./drivers/pci and it's dated October 2026 — periodt, see you in the next kernel release bestie 💜✨