pci_request...ns_exclusive(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

pci_request_regions_exclusive — bestie, this one reserves your PCI I/O and memory resources, like putting your name on the good couch 🛋️✨

So this is a page from the Kernel API Manual, and honestly it's giving "small function, big consequences" energy. Let's get into it 🫶

✨ SYNOPSIS ✨

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

🎀 ARGUMENTS 🎀

  • pdev — the PCI device whose resources you're out here reserving. Yes, that one 💅
  • name — the name of the driver that's requesting the resources. Basically signing your name on the sign-up sheet, no cap ✍️

🌸 RETURN 🌸

0 on success, negative error code on failure. That's it, that's the vibe check 🌈

🦋 DESCRIPTION 🦋

Okay so here's the whole thing, bestie. pci_request_regions_exclusive marks all the PCI regions associated with the PCI device pdev as being reserved by owner name. Simple as that, iconic behavior 👑

⚠️ Do not access any address inside the PCI regions unless this call returns successfully. Not even a little peek. Not even a "just checking." The audacity would be unreal 😭

On top of that, pci_request_regions_exclusive will mark the region so that /dev/mem and the sysfs MMIO access will not be allowed. Yeah — it literally locks the door behind it. Exclusive means exclusive, periodt 💅🔒

It returns 0 on success, or EBUSY on error. And a warning message is also printed on failure, so if you see that in dmesg, that's not me being dramatic, that's the kernel telling on you 💀

🧚 SEE ALSO 🧚

Lowkey the biggest friend group in the whole kernel. The Kernel file here is ./drivers/pci/pci.c, and these are all the siblings and cousins:

And that's the whole page, bestie 💖 This one lives under ./drivers/pci, it's from the Kernel API Manual, and it's dated October 2026 — so yeah, she's from the future and she's still out here reserving regions exclusively. Slay 🎀🔥👑

📦 where this page comes from