pcim_iounmap(9)

💅 pcim_iounmap(9) 💅

okay so this is a page straight out of the Kernel API Manual, and honestly? it's a little one but she matters. let's get into it ✨

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🌸 NAME 🌸

pcim_iounmap — the managed version of pci_iounmap(), and yes she's the responsible one 🫶

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🎀 SYNOPSIS 🎀

void pcim_iounmap (struct pci_dev *pdev , void __iomem *addr );

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🦋 ARGUMENTS 🦋

• pdev — the PCI device you're doing the iounmap for. like, the whole reason this mapping exists 💖
• addr — the address you wanna unmap. bye bestie 👋

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⭐ DESCRIPTION ⭐

So pcim_iounmap is the managed pci_iounmap(). that's the whole vibe. 🧚

⚠️ important caveat, no cap: addr must have been mapped using one of the pcim_* mapping functions. like, don't just roll up with any random address, that's not the energy we're going for 😭

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👑 SEE ALSO 👑

go check out the kernel file ./drivers/pci/devres.c — that's where the magic lives 🏠

• 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_iomap_region(9)
• pcim_iounmap_region(9)
• pcim_iomap_regions(9)
• pcim_request_region(9)
• pcim_release_region(9)
• pcim_release_all_regions(9)
• pcim_request_all_regions(9)
• pcim_iomap_range(9)

like, the whole pcim_* friend group fr fr 💜

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that's the page!! mwah 💋 this came from ./drivers/pci and it's dated October 2026 — stay unmap-ped and stay iconic, bestie 🎀✨