iommu_get_domain_for_dev(9)

iommu_get_domain_for_dev(9) — Kernel API Manual — bestie edition 💖

🎀 NAME 🎀

iommu_get_domain_for_dev — Return the DMA API domain pointer. That's the whole name section and it ate. 💅

✨ SYNOPSIS ✨

struct iommu_domain * iommu_get_domain_for_dev (struct device *dev );

🫶 ARGUMENTS 🫶

• dev — Device to query. Like, the device you're asking about, bestie. 🫶

💅 DESCRIPTION 💅

okay so here's the vibe: you can call this function from inside a driver that's bound to dev. The pointer it hands back is valid for the lifetime of the bound driver — so it's not a fleeting little vibe, it's got main character staying power. ✨

🚨 But listen: it should not be called by drivers with driver_managed_dma = true. That's the one caveat, no cap. If that's your driver, this function is not for you. 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/iommu/iommu.c — and here's the whole linked friend group, all of them, no skips:

• 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_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)

okay that's the whole page bestie 🫶 this one's source/version is ./drivers/iommu, dated October 2026, and it's filed under iommu_get_domain_for_dev(9) — slay, bye! 💅✨