STRUCT IOMMU_FLUSH_OPS(9)

✨ struct iommu_flush_ops(9) ✨

okay so bestie, we're in the Kernel API Manual today and this one is genuinely a vibe — it's all about the callbacks an IOMMU uses to keep its TLB and page tables from going feral 💅

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🎀 NAME 🎀

struct iommu_flush_ops — the IOMMU callbacks for TLB and page table management. that's it, that's the whole thing, no cap 🫶

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🌸 SYNOPSIS 🌸

struct iommu_flush_ops {
    void (*tlb_flush_all)(void *cookie);
    void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t
granule, void *cookie);
    void (*tlb_add_page)(struct iommu_iotlb_gather *gather, unsigned
long iova, size_t granule, void *cookie);
 };

like, look at her. three function pointers and a dream ✨

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🦋 Members 🦋

• tlb_flush_all — synchronously nukes the entire TLB context. all of it. gone. iconic 💀
• tlb_flush_walk — synchronously invalidates all the intermediate TLB state for a virtual address range — this is the thing people sometimes call the "walk cache", iykyk 🧚
• tlb_add_page — optional callback that queues up a leaf TLB invalidation for a single page. IOMMUs that can't batch TLB invalidation operations efficiently will typically just issue them right here instead, but others may decide to update the iommu_iotlb_gather structure and defer the invalidation until iommu_iotlb_sync instead. choose your fighter 🎀

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💜 Description 💜

⚠️ heads up bestie: these can all be called in atomic context, so they must therefore not block. like, at all. do not do it. not even a little 🙈

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/io-pgtable.h — go read it, it's giving main character energy 👑

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

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and that's the whole page, bestie!! this one lives in ./include/linux and it's dated October 2026 — slay, periodt, go flush some TLBs responsibly 💖🦋⭐