STRUCT IOMMU_DIRTY_OPS(9)

🎀 struct iommu_dirty_ops(9) 🎀

okay so bestie, welcome to the Kernel API Manual ✨ — yes it's the kernel, yes it's a struct, yes we're gonna get through this together, and yes you're gonna slay it 💅

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✨ NAME ✨

struct iommu_dirty_ops — the domain specific dirty tracking operations, periodt 🫶

Like, that's literally her whole job: tracking what's dirty in your domain. Iconic behavior honestly.

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🌸 SYNOPSIS 🌸

here's what she looks like, no notes:

struct iommu_dirty_ops {
    int (*set_dirty_tracking)(struct iommu_domain *domain, bool
enabled);
    int (*read_and_clear_dirty)(struct iommu_domain *domain, unsigned
long iova, size_t size, unsigned long flags, struct iommu_dirty_bitmap
*dirty);
 };

that's two function pointers and honestly? she ate 🔥

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💜 Members 💜

set_dirty_tracking 💅

Enables or Disables the dirty tracking on the iommu domain — that's the whole vibe. On or off, bestie, no in-between 🦋

read_and_clear_dirty 🧚

okay this one is doing the most and we love her for it. She walks the IOMMU page tables for dirtied PTEs marshalled into a bitmap, with a bit represented as a page ⭐ She reads the dirty PTE bits, and then she clears it from the IO pagetables. Read, then clear. Cleanup queen 👑

🎀 read carefully: the clearing is part of the deal — it reads the dirty bits and clears them from the IO pagetables. That's the whole function name, and she is not lying to you.

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🌈 SEE ALSO 🌈

bestie there are SO many friends here, it's giving family reunion 😭 all of these live in the kernel file ./include/linux/iommu.h:

• struct iommu_fault_page_request(9)
• struct iommu_fault(9)
• enum iommu_page_response_code(9)
• struct iommu_page_response(9)
• struct iopf_queue(9)
• struct iommu_resv_region(9)
• struct iommu_iotlb_gather(9)
• struct iommu_dirty_bitmap(9)
• struct iommu_user_data(9)
• struct iommu_user_data_array(9)
• __iommu_copy_struct_from_user(9)
• iommu_copy_struct_from_user(9)
• __iommu_copy_struct_from_user_array(9)
• iommu_copy_struct_from_user_array(9)
• iommu_copy_struct_from_full_user_array(9)
• __iommu_copy_struct_to_user(9)
• iommu_copy_struct_to_user(9)
• struct iommu_ops(9)
• struct iommu_domain_ops(9)
• struct iommu_device(9)
• struct iommu_fault_param(9)
• struct dev_iommu(9)
• iommu_iotlb_gather_is_disjoint(9)
• iommu_iotlb_gather_add_range(9)
• iommu_iotlb_gather_add_page(9)
• struct iommu_fwspec(9)
• struct iommu_sva(9)
• iommu_map_sgtable(9)

literally the whole group chat 💖 go say hi, iykyk.

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🦋 tiny footnote energy: this page lives at ./include/linux, and the version on deck is dated October 2026.

and that's the page, bestie — you understood it, you're a main character, go read some page tables 💅✨🎀