[Bug 283815] listing dev.vgapci.X.%iommu hangs indefinitely on NVIDIA card

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283815

--- Comment #5 from Konstantin Belousov <kib@FreeBSD.org> ---
The pci_get_requester() loops somewhere in the call to pci_find_cap_method().
The later is accessing the PCI config space directly, trying to read the header
and to iterate the list of the capabilities, for instance, to read PCIe cap.

To further diagnose the problem, you might try to instrument
pci_find_cap_method()
to see which registers it tries to read. My guess is that the cap read cycle
gets
something like 0xff as the offset of the next capability and then loops back.

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