pci node question

[Benjamin Herrenschmidt]

On Fri, 2012-04-20 at 15:37 -0500, Kumar Gala wrote:
> > What does this node represent in the first place?  Is there really a
> > PCI-to-PCI bridge?  Are all other PCI devices underneath it?
> 
> PCIe has this concept of a "virtual" bridge between the root-comples,
> so that is what the node represents.  Its always been a bit confusing
> to me as its not 100% standardized by PCI sig.

It actually is. The root complex virtual p2p is absolutely part of the
standard.

Cheers,
Ben.