arm_iommu_create_mapping(9)

📦 version 7.3.1, in nixpkgs unstable

✨ arm_iommu_create_mapping(9) ✨

okay so bestie, this is a page straight out of the Kernel API Manual — yeah, the kernel kernel, the big one 💅. It's about ARM IOMMU mapping creation and it's honestly lowkey iconic. Let's get into it 🎀

🌸 NAME 🌸

arm_iommu_create_mapping -

(no cap, the original description here is literally empty — she said "no thoughts, head empty" 😭 so we're just vibing with the function name)

🦋 SYNOPSIS 🦋

struct dma_iommu_mapping * arm_iommu_create_mapping (struct device *dev
, dma_addr_t base , u64 size );

💖 ARGUMENTS 💖

  • dev — pointer to the client device (for IOMMU calls) 👑 this is your main character, the device that's gonna be doing the IOMMU thing
  • base — start address of the valid IO address space ✨ where the party starts
  • size — maximum size of the valid IO address space 🌈 how big the party gets, fr fr

🧚 DESCRIPTION 🧚

So what does she do? She creates a mapping structure that holds all the info about which IO address ranges are used vs. unused — literally the blueprint, the vibe check for your address space 📋. You need this structure to perform memory allocation and mapping with IOMMU aware functions. No structure, no mapping, periodt 💅

But here's the thing bestie, listen — the client device still needs to be attached to the mapping, and you do that with the arm_iommu_attach_device function 🫶. Creating the mapping is only step one. Don't forget the attach. She's not gonna attach herself, iykyk 😭

⚠️ real talk: make the mapping, then attach the device with arm_iommu_attach_device. Both steps, or it's giving incomplete.

⭐ SEE ALSO ⭐

Kernel file ./arch/arm/mm/dma-mapping.c — that's where all the lore lives 📖✨

the whole friend group honestly, go read all of them 🦋💜

and that's the page!! 🎀 brought to you from ./arch/arm/mm, dated October 2026, and yes the title is still arm_iommu_create_mapping(9) because she's that girl 💅✨ mwah, go forth and map responsibly 💖

📦 where this page comes from