iommufd_ctx_has_group(9)

💖 iommufd_ctx_has_group 💖

okay bestie, this is a page from the Kernel API Manual (that's the manual name, cute right?) and it's all about one tiny little boolean function that answers a very specific question. let's get into it 🫶

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✨ NAME ✨

iommufd_ctx_has_group — returns true if any device within the group is bound to the ictx 🎀

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🌸 SYNOPSIS 🌸

bool iommufd_ctx_has_group (struct iommufd_ctx *ictx , struct iommu_group *group );

like, that's the whole thing. a bool. no cap. 💅

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🦋 ARGUMENTS 🦋

• ictx — the iommufd file descriptor. yes the fd, that's what we're checking against 👑
• group — a pointer to a physical iommu_group struct. just a pointer. that's it. that's the whole vibe 🌈

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⭐ DESCRIPTION ⭐

so here's the tea ☕ — this returns true if any device within the group has been bound to this ictx, like for example via iommufd_device_bind. and because of that, it implies that the ictx has ownership of the group. iykyk. 💀

it's literally just a vibe check on "do you own this group or not" and honestly? iconic. ✨

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🧚 SEE ALSO 🧚

the kernel file lives at ./drivers/iommu/iommufd/device.c bestie, and here's the whole friend group 🫶:

• iommufd_device_bind(9)
• iommufd_device_unbind(9)
• iommufd_device_attach(9)
• iommufd_device_replace(9)
• iommufd_device_detach(9)
• iommufd_access_create(9)
• iommufd_access_destroy(9)
• iommufd_access_notify_unmap(9)
• iommufd_access_unpin_pages(9)
• iommufd_access_pin_pages(9)
• iommufd_access_rw(9)

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okay that's the page!! 💜 this one came out of ./drivers/iommu/iommufd, dated October 2026, and honestly the whole thing ate. mwah, go read the rest of the kernel docs, ily, bye 🎀🔥