iommu_devic...fault_domain(9)

💖 NAME 💖

okay bestie so this is a Kernel API Manual page (the header at the top literally reads iommu_devic...fault_domain(9) — it's truncated, not you, don't worry 💅) and it's all about iommu_device_use_default_domain — the thing a device driver calls when it wants to handle that device's DMA through the kernel DMA API. that's the whole vibe. 🦋

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✨ SYNOPSIS ✨

int iommu_device_use_default_domain (struct device *dev );

literally one argument, one int. clean. minimal. icon behavior. 🎀

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🌸 ARGUMENTS 🌸

• dev — the device. that's it. that's the whole argument. it's the device, no cap. 🫶

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💜 DESCRIPTION 💜

so here's the tea ☕ — the device driver that's about to bind dev wants to do DMA through the kernel DMA API. this function is the little vibe check for that.

it returns 0 if it's allowed, otherwise it hands you back an error. that's the whole contract, and honestly? iconic. ✨

ngl, no extra lore in the original here — just "return 0 if allowed, otherwise an error." no invented drama, bestie. 🙈

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🔥 SEE ALSO 🔥

all the siblings from the kernel file ./drivers/iommu/iommu.c — say hi to the whole group chat 👑:

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_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 page, bestie — it lives under ./drivers/iommu, the version stamp says October 2026, and the footer is still repping that same truncated iommu_devic...fault_domain(9) energy. periodt. 💅🌈💖