iommu_copy_struct_from_user(9)

💖 iommu_copy_struct_from_user(9) 💖

okay bestie, so this is a page from the Kernel API Manual and it's literally about iommu_copy_struct_from_user — the little helper that copies iommu driver specific user space data 🦋 no cap, that's the whole vibe.

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✨ NAME ✨

iommu_copy_struct_from_user — copy iommu driver specific user space data 💅

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🌸 SYNOPSIS 🌸

iommu_copy_struct_from_user (kdst , user_data , data_type , min_last );

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🎀 ARGUMENTS 🎀

• kdst — pointer to an iommu driver specific user data that is defined in include/uapi/linux/iommufd.h 👑 that's where your struct lives, go say hi.
• user_data — pointer to a struct iommu_user_data that carries the user space data info 🫶 it's like the little info card for the data.
• data_type — the data type of the kdst. it must match with user_data->type ⚠️ like, must must. no mismatching allowed, that's the rule.
• min_last — the last member of the data structure kdst points in the initial version. Return 0 for success, otherwise -error 💀 yes, that's literally what it says: 0 for success, otherwise -error.

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🌈 SEE ALSO 🌈

okay this list is lowkey iconic, it's giving "the whole iommu friend group" — and it starts with 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_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_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)

fr fr, go read them, they ate 🔥

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ngl there's no ERRORS section here, so if something goes sideways just remember that min_last says Return 0 for success, otherwise -error — that's your whole mood check 💜

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and that's the page bestie!! 🧚 sign-off time: this one lives in ./include/linux, dated October 2026, and it's page iommu_copy_struct_from_user(9) — periodt 💅✨🍓