start of some pci cleanups

[Egbert Eich]

Dave Airlie writes:
 > This is a first patch that cleans up some PCI interfaces, we don't
 > have any idea about domains at the normal level of the driver, I think
 > we should at least add the idea.
 > 
 > http://people.freedesktop.org/~airlied/change_pci_interface.diff
 > 
 > This just adds pci domain to the pcibusid struct and passes the
 > PciBusId struct around instead of passing bus,dev,func triplets.
 > 
 > For my next trick, I'd like to fix the xf86MapPciMem entry point to
 > take a pciVideoPtr, so that we can figure out the file in
 > /proc/bus/pci or /sys on Linux that is needed and mmap it rather than
 > using /dev/mem which is something that I'd like to stop doing.
 > 

Dave,

I've also been looking into the PCI domain stuff.
Maybe we should coordinate this work.
getting rid of the individual bus,dev,func entries would
certainly be a good goal - just as getting rid of PCITAGs.
We should find a convenient time to do this for the compatibility
issues involved.
I wonder if this work shouldn't be done in a separate branch in
the repository until we have identified a time slot for merging.

Egbert.