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Add OFW_IOMMU id type for pci_get_id() so we can ask parent IOMMU

Description

Add OFW_IOMMU id type for pci_get_id() so we can ask parent IOMMU
controller to map PCI RID to an IOMMU specifier.

Sponsored by: UKRI
Discussed with: jhb
Differential Revision: https://reviews.freebsd.org/D35129

Details

Provenance
brAuthored on May 7 2022, 9:17 AM
Differential Revision
D35129: Add a PCI method for mapping IOMMU
Parents
rG904c148f1c93: libutil: eliminate one syscall from kinfo_getproc
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