remap_io_mapping(9)

💖 NAME 💖

okay so bestie, this is remap_io_mapping(9) from the Kernel API Manual — and it's literally the page for remapping an IO mapping to userspace. that's the whole vibe. no cap ✨

✨ SYNOPSIS ✨

int remap_io_mapping (struct vm_area_struct *vma , unsigned long addr , unsigned long pfn , unsigned long size , struct io_mapping *iomap );

🎀 ARGUMENTS 🎀

• vma — the user vma to map to. yes, that vma. main character energy.
• addr — target user address to start at. the starting point, periodt.
• pfn — physical address of kernel memory. physical, not virtual, iykyk.
• size — size of map area. how much map area we're talking about.
• iomap — the source io_mapping. the source of the whole mapping moment.

⚠️ NOTE ⚠️

this is only safe if the mm semaphore is held when called. fr fr, hold that semaphore, bestie — no exceptions.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/i915/i915_mm.c
• remap_io_sg(9)

mwah 💋 this cutie is from ./drivers/gpu/drm/i915, dated October 2026, and the page name is remap_io_mapping(9). slay 💅