svn commit: r334365 - head/sys/dev/pci

[Justin Hibbits]

On Wed, May 30, 2018 at 4:42 AM, Peter Grehan <grehan at freebsd.org> wrote:
>>    PCIe only permits 1 device on an endpoint, so some devices ignore the
>> device
>>    part of B:D:F probing.  Although ARI likely fixes this, not all
>> platforms
>>    support ARI completely or correctly, so some devices end up showing up
>> 32
>>    times on the bus.
>
>
>  I think this might have broken bhyve - a fake PCIe capability is put on the
> root port so that guests will use MSI/MSI-x, but otherwise it looks like
> parallel PCI. Not exactly spec-compliant, but then neither is most of the
> world of PCI/PCIe.
>
>  It may be worth #ifdef'ing this with powerpc.
>
> later,
>
> Peter.

I can special case i386 and amd64, but this change should (eventually)
remove the majority of the current special case overrides for
alternative architectures.

I think it'd be better to have a bhyve root bridge driver that itself
overrides pci_maxslots(), and have the 'compliant' path be the common.

Thoughts?

- Justin