pcim_iomap_region(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pcim_iomap_region(9) — the Kernel API Manual, but make it cute 🎀

okay so bestie, welcome to pcim_iomap_region — it's the kernel API manual page, and yes it's short, but it's lowkey iconic ✨

🌸 NAME 🌸

pcim_iomap_region — Request and iomap a PCI BAR. that's it, that's the vibe 🫶

✨ SYNOPSIS ✨

void __iomem * pcim_iomap_region (struct pci_dev *pdev , int bar , const
char *name );

not me writing this out char-for-char because we do not paraphrase code in this house 💀

🦋 ARGUMENTS 🦋

  • pdev — the PCI device you're mapping IO resources for. the main character of this whole situation 👑
  • bar — the index of the BAR you wanna map. just an index, bestie, pick the right one 🙈
  • name — the name of the driver requesting the resource. yes it has to be you. put your name on it 💖

🎀 RETURN 🎀

  • a __iomem pointer when it slays (success) ✨
  • an IOMEM_ERR_PTR when it does not ✨😭

like it's giving "check your pointer before you use it", fr fr 🔥

🌈 DESCRIPTION 🌈

so here's the tea: the mapping and the region get automatically released on driver detach 🧚 no cap, the kernel cleans up after you.

but if you're feeling independent and you really want to release manually? you do it only with pcim_iounmap_region. that's the one and only correct way, periodt 💅

lowkey important: "only with pcim_iounmap_region" is doing a lot of work in that sentence — don't freelance this one 🫶

💜 SEE ALSO 💜

like, go read these too, iykyk ⭐

and that's the whole page, bestie 🦋 this little gem lives in ./drivers/pci, dated October 2026, and it goes by pcim_iomap_region(9) — mwah, ily, go map a BAR responsibly 💖🎀🌸

📦 where this page comes from