PCI domains [Was: CVS commit: xsrc/external/mit/libpciaccess/dist/src]

[Simon Burge <simonb%NetBSD.org@localhost>]

Christoph Egger wrote:

> Michael Lorenz wrote:
>
> > +/*
> > + * NetBSD's userland has a /dev/pci* entry for each bus but userland has 
> > no way
> > + * to tell if a bus is a subordinate of another one or if it's on a 
> > different
> > + * host bridge.
> 
> I have a patch which introduces support for PCI domains. It allows the
> userland to distinguish between them by checking if the pci bus belongs
> to the same PCI domain.

What exactly is a "PCI domain"?  A quick google seems to suggest that
this is a Linux concept as opposed to a PCI concept.  In a previous
life we used NetBSD on a number of different machines of various
architectures that had multiple PCI host bridges, although admittedly we
didn't need to know the topology of the PCI bus layout.

Cheers,
Simon.