iort_dev_find_its_id(9)

💅 iort_dev_find_its_id(9) — like, the Kernel API Manual page, bestie 🎀

okay so this is a page straight outta the Kernel API Manual, and it's giving "small function, big responsibilities" energy. We're talking iort_dev_find_its_id — aka the little guy that goes and finds the ITS identifier for a device. Let's get into it, no cap ✨

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🌸 NAME 🌸

iort_dev_find_its_id — find the ITS identifier for a device 🦋

Like, that's literally the whole job. It finds the ITS id. For a device. Iconic behavior honestly.

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✨ SYNOPSIS ✨

int iort_dev_find_its_id (struct device *dev , u32 id , unsigned int idx
, int *its_id );

copy that exactly, bestie, spacing and all — do NOT let your editor "fix" it 🙈

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💖 ARGUMENTS 💖

okay so the function takes four things, and each one is doing its own little job:

• dev — the device. yeah. just the device. the main character of this whole operation 👑
• id — the device's ID. it's a u32, and it's the ID we're working with.
• idx — the index of the ITS identifier list. so there's a list, and this is which slot in it we care about 🔥
• its_id — the ITS identifier. this is where the ITS id lands 🎯

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⭐ RETURN ⭐

0 on success — slay 💅 — and, like, an appropriate error value otherwise 😭 so always check your return value, fr fr.

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🌈 SEE ALSO 🌈

the Kernel file ./drivers/acpi/arm64/iort.c and honestly the whole IORT friend group, all showing up to the group chat together 🫶:

• iort_set_fwnode(9)
• iort_get_fwnode(9)
• iort_delete_fwnode(9)
• iort_get_iort_node(9)
• iort_register_domain_token(9)
• iort_deregister_domain_token(9)
• iort_find_domain_token(9)
• iort_msi_map_id(9)
• iort_msi_xlate(9)
• iort_pmsi_get_msi_info(9)
• iort_get_device_domain(9)
• iort_get_platform_device_domain(9)
• iort_iommu_get_resv_regions(9)
• iort_get_rmr_sids(9)
• iort_put_rmr_sids(9)
• iort_iommu_configure_id(9)
• iort_dma_get_ranges(9)
• iort_add_platform_device(9)

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🫶 okay that's the whole page, go read the source at ./drivers/acpi/arm64 if you're feeling brave, and remember: iort_dev_find_its_id(9) said hi 💜

and that's a wrap, bestie — this one's from ./drivers/acpi/arm64, dated October 2026, and it will forever be known as iort_dev_find_its_id(9) 💅✨🎀