iommu_group_get(9)

iommu_group_get(9) — Kernel API Manual 🎀

okay bestie, this one’s straight from the Kernel API Manual, and it’s lowkey iconic: it’s all about grabbing a device’s IOMMU group and bumping that reference. slay. 💅

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✨ NAME ✨

iommu_group_get — return the group for a device and increment the reference. periodt. 💖

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✨ SYNOPSIS ✨

struct iommu_group * iommu_group_get (struct device *dev );

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✨ ARGUMENTS ✨

• dev — the device whose group you want. like, “bestie, which group does this device belong to?” 🫶

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✨ DESCRIPTION ✨

so this function is called by iommu drivers and users to get the group for the specified device. if it finds the group, it returns that group and the group reference is incremented — yup, the reference goes up, no cap. if it doesn’t find one, you get NULL. 😭

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✨ SEE ALSO ✨

Kernel file: ./drivers/iommu/iommu.c 🌸

• iommu_device_register(9)
• 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_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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and that’s the whole page, bestie 🫶 this little sign-off is comin’ at you from source/version ./drivers/iommu, dated October 2026 — iommu_group_get(9) out. 💖✨