pci_iomap(9)

🎀 NAME 🎀

okay so pci_iomap - create a virtual mapping cookie for a PCI BAR 💅 and yes bestie, this is pci_iomap(9) from the Kernel API Manual.

✨ SYNOPSIS ✨

void __iomem * pci_iomap (struct pci_dev *dev , int bar , unsigned long maxlen );

🦋 ARGUMENTS 🦋

• dev — PCI device that owns the BAR 💖
• bar — BAR number ✨
• maxlen — length of the memory to map 🎀

💜 DESCRIPTION 💜

Using this function you will get a __iomem address to your device BAR. iconic. You can access it using ioread*() and iowrite*(). These functions hide the details if this is a MMIO or PIO address space and will just do what you expect from them in the correct way — no cap, they handle the vibe check for you 🫶.

maxlen specifies the maximum length to map. If you want to get access to the complete BAR without checking for its length first, pass 0 here. literally just 0 and go 👑

🌈 SEE ALSO 🌈

• Kernel file ./drivers/pci/iomap.c 🧚
• pci_iomap_range(9) 🌸
• pci_iomap_wc_range(9) 💫
• pci_iomap_wc(9) ⭐

mwah 💋 this page is from ./drivers/pci, dated October 2026 — bye bestie, go map that BAR 🫶✨