iommu_device...se_dma_owner(9)

💖 iommu_device_release_dma_owner — the Kernel API Manual, bestie edition 🎀

okay so welcome to the Kernel API Manual, and today's main character is iommu_device_release_dma_owner(9) — the "okay i'm done, you can have it back" of the IOMMU world 💅

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✨ NAME ✨

iommu_device_release_dma_owner — Release DMA ownership of a device 🫶

Like, giving the keys back. Politely. Because you're a good citizen.

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✨ SYNOPSIS ✨

void iommu_device_release_dma_owner (struct device *dev );

yes it's void, it returns nothing, it just does the thing and leaves ✨

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✨ ARGUMENTS ✨

• dev — The device. that's it, that's the whole argument. the device whose DMA ownership you are about to hand back 💖

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✨ DESCRIPTION ✨

So here's the vibe: this releases the DMA ownership that was claimed by iommu_device_claim_dma_owner. That's it. That's the whole function. You claimed it, now you're releasing it — the circle of life, no cap 🌈

Think of it as the matching pair, iykyk. Don't leave it un-released, that's giving leaks 💀

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✨ SEE ALSO ✨

Kernel file ./drivers/iommu/iommu.c — and honestly the whole IOMMU friend group showed up, so let's do the roll call 🎀

• 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_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_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)

like, the entire extended family 😭 every single one of them, we love a full roster 👑

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source: ./drivers/iommu — dated October 2026, page iommu_device...se_dma_owner(9) 🦋

mwah, go release your DMA ownership responsibly bestie, ily, bye! 💜✨