iommu_device_register(9)

💖 NAME 💖

okay so welcome to iommu_device_register(9) from the Kernel API Manual, bestie 🫶. This page is literally about registering an IOMMU hardware instance, and we're gonna make it make sense.

iommu_device_register — register an IOMMU hardware instance. Slay 💅.

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📜 SYNOPSIS 📜

here's the exact signature, copy it character for character because she is iconic:

       int iommu_device_register (struct iommu_device *iommu , const struct
       iommu_ops *ops , struct device *hwdev );

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🎀 ARGUMENTS 🎀

• iommu — IOMMU handle for the instance. This is the main-character handle, no cap.
• ops — IOMMU ops to associate with the instance. The operation bestie that comes along for the ride.
• hwdev — (optional) actual instance device, used for fwnode lookup. Optional, so don't stress if it's not there 💖.

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✨ RETURN ✨

It returns 0 on success, or an error. That's the whole vibe check: 0 means slay, anything else means something went sideways 😭.

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🦋 SEE ALSO 🦋

Kernel file ./drivers/iommu/iommu.c is right here, and these are the cross-reference besties:

• Kernel file ./drivers/iommu/iommu.c
• iommu_insert_resv_region(9)
• iommu_group_alloc(9)
• iommu_group_get_iommudata(9)
• iommu_group_set_iommudata(9)
• iommu_group_set_name(9)
• iommu_group_add_device(9)
• iommu_group_remove_device(9)
• iommu_group_mutex_assert(9)
• iommu_group_for_each_dev(9)
• iommu_group_get(9)
• iommu_group_ref_get(9)
• iommu_group_put(9)
• iommu_group_id(9)
• device_iommu_capable(9)
• iommu_group_has_isolated_msi(9)
• iommu_set_fault_handler(9)
• iommu_paging_domain_alloc_flags(9)
• iommu_attach_device(9)
• iommu_get_domain_for_dev(9)
• iommu_driver_get_domain_for_dev(9)
• iommu_attach_group(9)
• iommu_unmap(9)
• iommu_unmap_fast(9)
• report_iommu_fault(9)
• iommu_get_resv_regions(9)
• iommu_put_resv_regions(9)
• iommu_setup_default_domain(9)
• iommu_device_use_default_domain(9)
• iommu_device_unuse_default_domain(9)
• iommu_group_claim_dma_owner(9)
• iommu_device_claim_dma_owner(9)
• iommu_group_release_dma_owner(9)
• iommu_device_release_dma_owner(9)
• iommu_group_dma_owner_claimed(9)
• iommu_replace_device_pasid(9)
• iommu_attach_handle_get(9)
• iommu_attach_group_handle(9)
• iommu_detach_group_handle(9)
• iommu_replace_group_handle(9)
• pci_dev_reset_iommu_prepare(9)
• pci_dev_reset_iommu_done(9)
• iommu_dma_prepare_msi(9)

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mwah 💋 this cutie page comes from ./drivers/iommu and is dated October 2026 — bye bestie, go register that IOMMU 🫶✨.