pcim_request_region(9)

pcim_request_region(9) 🎀

okay so bestie, we’re flipping through the Kernel API Manual and this little icon is pcim_request_region(9) — yes, the PCI BAR-requesting bestie. come on, let’s get into it 💖

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✨ NAME ✨

pcim_request_region — Request a PCI BAR. that’s the whole vibe. 🦋

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🌸 SYNOPSIS 🌸

int pcim_request_region (struct pci_dev *pdev , int bar , const char
       *name );

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💅 ARGUMENTS 💅

• pdev — the PCI device you’re requesting the region for, bestie. that’s your main character device. 👑
• bar — index of the BAR to request. just the index, no cap. 🔥
• name — name of the driver requesting the resource. put your driver’s name on it, periodt. ✨

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⭐ RETURN ⭐

It gives you 0 on success, or a negative error code on failure. that’s it, fr fr. 💀

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🦋 DESCRIPTION 🦋

Request the region specified by bar. lowkey simple, highkey useful. 🫶

The region will automatically be released on driver detach. so like, cleanup is handled for you — iconic behaviour, honestly. if desired, release manually only with pcim_release_region. that “only” is doing heavy lifting, so don’t get cute with it. 💅

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🌈 SEE ALSO 🌈

Kernel file ./drivers/pci/devres.c, plus these besties:

• devm_pci_remap_iospace(9)
• devm_pci_remap_cfgspace(9)
• devm_pci_remap_cfg_resource(9)
• pcim_set_mwi(9)
• pcim_intx(9)
• pcim_enable_device(9)
• pcim_pin_device(9)
• pcim_iomap_table(9)
• pcim_iomap(9)
• pcim_iounmap(9)
• pcim_iomap_region(9)
• pcim_iounmap_region(9)
• pcim_iomap_regions(9)
• pcim_release_region(9)
• pcim_release_all_regions(9)
• pcim_request_all_regions(9)
• pcim_iomap_range(9)

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mwah, bestie 💋 — this page is brought to you by ./drivers/pci, dated October 2026. slay. 🌟