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

Nathan Whitehorn nwhitehorn at freebsd.org
Wed May 30 14:37:48 UTC 2018



On 05/30/18 02:42, Peter Grehan 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.
>

There are a ton of ARM boards that need this too. You can find one-off 
hacks all through the tree and one of the nice things about this change 
is that all of those can be consolidated/removed now. If we are going to 
have some #ifdef and special cases, it would be better to make them for 
bhyve.
-Nathan


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