pci_rebar_ge...ssible_sizes(9)

💅 pci_rebar_ge...ssible_sizes(9) 💅

okay so this little icon lives in the Kernel API Manual, and honestly? it's a glow-up for anyone trying to figure out how big a Resizable BAR can actually get. bestie, let's get into it ✨

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🌸 NAME 🌸

pci_rebar_get_possible_sizes — get possible sizes for Resizable BAR

like, all the sizes it could be. the full menu. the whole vibe check 🎀

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🦋 SYNOPSIS 🦋

u64 pci_rebar_get_possible_sizes (struct pci_dev *pdev , int bar );

that's the whole thing. no cap, she's compact 💜

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✨ ARGUMENTS ✨

• pdev — the PCI device, aka the main character you're asking about 👑
• bar — the BAR to query, like "which one, babe?" 🧚

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💖 DESCRIPTION 💖

Get the possible sizes of a resizable BAR as a bitmask. that's it, that's the whole plot 🍓

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🔥 RETURN 🔥

A bitmask of possible sizes (bit 0=1MB, bit 31=128TB), or 0 if the BAR isn't resizable 😭

lowkey important: if you get 0 back, that BAR is not resizable, periodt. don't go reading into it 💀

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🌈 SEE ALSO 🌈

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

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

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and that's the whole page, bestie 🫶 it's giving ./drivers/pci, dated October 2026 — iconic, no notes 💅⭐