pci_rebar_get_current_size(9)

💖 pci_rebar_get_current_size(9) 💖

okay so this is a page straight out of the Kernel API Manual, and bestie, we're about to learn how to read the current size of a Resizable BAR. it's giving "small function, big energy" ✨ no cap.

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🌸 NAME 🌸

pci_rebar_get_current_size — get the current size of a Resizable BAR 🎀

✨ SYNOPSIS ✨

int pci_rebar_get_current_size (struct pci_dev *pdev , int bar );

like, that's the whole vibe. one function, two args, zero drama 💅

🦋 ARGUMENTS 🦋

• pdev — the PCI device. your main character, basically 👑
• bar — the BAR you wanna get the size from. yes, that BAR 🫶

🧚 DESCRIPTION 🧚

so what does it actually do? it reads the current size of a BAR from the Resizable BAR config. that's it. that's the whole function. lowkey iconic for how straightforward it is 💜

⭐ RETURN ⭐

it returns the BAR Size if bar is resizable — and the values are numbered like this: 0=1MB, 31=128TB 😭 (imagine going from one megabyte to a hundred and twenty-eight terabytes, the glow-up is real).

or it returns negative on error. so if you see a negative number, something went wrong and you should respectfully back away 🙈

ngl bestie, always check for that negative return. it's giving red flag 💀

🔥 SEE ALSO 🔥

• Kernel file ./drivers/pci/rebar.c
• 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_set_size(9)
• pci_resize_resource(9)

like the whole rebar friend group is tagged, we love a supportive cast 🌈

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and that's the tea, bestie 🍓 this lil page lives in ./drivers/pci and was dated October 2026 — so if you're reading it, mwah, hope it slayed 💋 periodt 🎀✨