iommu_iotlb_..._is_disjoint(9)

💅 iommu_iotlb_..._is_disjoint(9) — the Kernel API Manual glow-up

okay bestie, welcome to the kernel API manual page for iommu_iotlb_..._is_disjoint — yes that truncated name is literally the header, the kernel devs were being mysterious, we love that for them 🎀

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✨ NAME ✨

iommu_iotlb_gather_is_disjoint — the little helper that checks whether a new range is disjoint 🦋

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🌸 SYNOPSIS 🌸

bool iommu_iotlb_gather_is_disjoint (struct iommu_iotlb_gather *gather ,
unsigned long iova , size_t size );

it gives you back a bool, no cap 💖

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🎀 ARGUMENTS 🎀

• gather — the TLB gather data, aka the vibes you're checking against ✨
• iova — start of page to invalidate, like where the drama begins 📍
• size — size of page to invalidate, how much of the page is in the group chat 📏

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💜 DESCRIPTION 💜

so this is a helper for IOMMU drivers 🧚 it checks whether a new range and the gathered range are disjoint.

and here's the tea: for many IOMMUs, flushing the IOMMU in this case is better than merging the two — because merging might lead to unnecessary invalidations 😭 and nobody wants that, it's giving wasted work, not main character energy. so yeah, disjoint check first, slay 💅

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👑 SEE ALSO 👑

okay this list is long, grab a snack 🍓 — Kernel file ./include/linux/iommu.h and then all of these:

• 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_dirty_ops(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_add_range(9)
• iommu_iotlb_gather_add_page(9)
• struct iommu_fwspec(9)
• struct iommu_sva(9)
• iommu_map_sgtable(9)

fr fr go read them, iykyk 📚🔥

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ngl bestie, that's the whole page — short, iconic, no filler. go be disjoint 💀✨

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mwah 💋 this page lives in <code>./include/linux</code>, dated October 2026, and its whole title situation is <code>iommu_iotlb_..._is_disjoint(9)</code> — periodt, that's the sign-off 🫶🌈