iommu_copy_struct_to_user(9)

💖 iommu_copy_struct_to_user(9) 💖

okay so this is a page straight out of the Kernel API Manual bestie, and it's all about iommu_copy_struct_to_user — which honestly does exactly what it says on the tin: it reports iommu driver specific user space data. slay. that's the whole vibe. 🦋

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✨ NAME ✨

iommu_copy_struct_to_user — Report iommu driver specific user space data 💅

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🌸 SYNOPSIS 🌸

iommu_copy_struct_to_user (user_data , ksrc , data_type , min_last );

like, four things go in. no cap. 🎀

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🫶 ARGUMENTS 🫶

• user_data — a pointer to a struct iommu_user_data that says where the user space data is supposed to live. that's the drop-off address, basically. 📍
• ksrc — a pointer to an iommu driver specific user data, and that data is defined over in include/uapi/linux/iommufd.h. that's where the goods come from. 🍓
• data_type — the data type of the ksrc. it must match with user_data->type. not "should", not "ideally" — must. vibe check on types, no exceptions. 🔥
• min_last — the last member of the data structure that ksrc points to, in the initial version. and yeah, it returns 0 for success, otherwise -error. so a big fat zero is the good ending. 😭✨

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👑 SEE ALSO 👑

like a whole friend group, honestly — go say hi to all of them:

• 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_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)
• 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)

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💀 reminder bestie: data_type has to match user_data->type, and if it doesn't go the way you want you're getting -error instead of that sweet 0. watch the types. iykyk.

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🌈 okay that's the whole thing, mwah 💜 — this little gem lives in ./include/linux, dated October 2026, and it's iommu_copy_struct_to_user(9) forever and always. periodt. 🧚‍♀️⭐