alloc_io_pgtable_ops(9)

✨ alloc_io_pgtable_ops 💅

okay so bestie, welcome to the Kernel API Manual — this is the alloc_io_pgtable_ops(9) page and it's literally about getting your IOMMU a page table allocator. yes we're in that part of the kernel. stay with me 🫶

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🌸 NAME 🌸

alloc_io_pgtable_ops — Allocate a page table allocator for use by an IOMMU.

that's it. that's the whole vibe. it makes an allocator, the IOMMU uses it. iconic. ✨

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🎀 SYNOPSIS 🎀

struct io_pgtable_ops * alloc_io_pgtable_ops (enum io_pgtable_fmt fmt ,
struct io_pgtable_cfg *cfg , void *cookie );

like, three things go in, a pointer comes out. no cap. 🦋

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💖 ARGUMENTS 💖

• fmt — The page table format. literally just which flavour of page table you want, bestie. pick your fighter. 🌈
• cfg — The page table configuration. heads up though: this thing gets modified — it'll be rewritten to represent the configuration actually provided by the allocator (for example, the pgsize_bitmap may be restricted). so don't be shook when you look at it later and it's different. it's giving "we changed your order at the drive-thru." 😭
• cookie — An opaque token provided by the IOMMU driver, passed back to the callback routines. yes it's literally just a cookie. you hand it over, it comes right back to you. iykyk 🍓

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👑 RETURN 👑

A pointer to the struct io_pgtable_ops for this set of page tables. that's your main character right there ⭐

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🧚 SEE ALSO 🧚

Kernel file ./include/linux/io-pgtable.h — plus the whole friend group:

• struct iommu_flush_ops(9)
• struct io_pgtable_cfg(9)
• struct arm_lpae_io_pgtable_walk_data(9)
• struct io_pgtable_ops(9)
• free_io_pgtable_ops(9)
• struct io_pgtable(9)
• enum io_pgtable_caps(9)
• struct io_pgtable_init_fns(9)

go read them. they miss you. 💜

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and that's the page!! mwah 💋 — sourced from ./include/linux, dated October 2026, part of the Kernel API Manual lineup. slay, go allocate something responsibly 🔥🎀