sys: Make the iommu xref uintptr_t
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Authored by andrew on Jan 30 2025, 2:51 PM.

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Reviewers

kib
manu

Group Reviewers

arm64

Summary

On arm64 we use the iommu base address as an xref. This fails when
the address has the lower 32-bits in common with another iommu as
they will share an xref.

Diff Detail

Repository

rG FreeBSD src repository

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Build Status

Buildable 62271
Build 59155: arc lint + arc unit

Event Timeline

andrew created this revision.Jan 30 2025, 2:51 PM

Herald added a reviewer: manu. · View Herald TranscriptJan 30 2025, 2:51 PM

Herald added subscribers: emaste, imp. · View Herald Transcript

Harbormaster completed remote builds in B62142: Diff 150189.Jan 30 2025, 2:51 PM

andrew requested review of this revision.Jan 30 2025, 2:51 PM

andrew added a parent revision: D48725: arm64/its: Support devices not behind an iommu.

kib added inline comments.Jan 30 2025, 4:19 PM

sys/arm64/iommu/smmu.c
1784	So why is it uintptr_t * and not uint64_t *?

andrew added inline comments.Feb 4 2025, 5:03 PM

sys/arm64/iommu/smmu.c
1784	`pci_id_ofw_iommu.xref` is the wrong type, it should be a `uintptr_t`. The intention is for it to be generic where it may vary on different architectures and different busses. As such I was copying the INTRNG use of using an integer type that can contain a pointer.