Re: PCI domains

[Takayoshi Kochi <takayoshi.kochi%gmail.com@localhost>]

ia64 also needs multiple PCI domain support.
Actually HP Itanium servers use PCI domains.

IIRC in Alpha terms, it's called "PCI hose".

2009/7/10 Simon Burge <simonb%netbsd.org@localhost>

> "Christoph Egger" wrote:
>
> > > "Christoph Egger" wrote:
> > >
> > > > PCI domains are part of the PCI host bridge specification.
> > > > It is a 16bit-wide number.
> > >
> > > Can you please provide a reference for this?  There's nothing mentioned
> > > in the PCI Local Bus Specification version 2.3.  I can find plenty of
> > > references to "clock domains" and "address space domains", but when I
> > > exclude Linux references I can't seem to find anything useful.
> >
> > It's not in the PCI Local Bus Specification nor in the
> > PCI-to-PCI Bridge Specification. It is in the
> > PCI Host Bridge Specification which is a vendor specific paper.
>
> Again, can you please point to a specific reference?  I grabbed a few
> different host bridge specs and have yet to find any concrete reference
> to "PCI domains".
>
> > The pci host bridges for the alpha port implements PCI domains.
>
> Our alpha port?
>
> thoreau 1170> grep -ir domain alpha
> alpha/include/ieeefp.h: * Public domain.
> alpha/include/fpu.h: * the definition prefix can easily be determined from
> public domain
> alpha/pci/pci_6600.h:/* Public Domain */
>
> > > Everything I see so far says that a "PCI domain" is an OS abstraction
> > > and not part of a PCI specification.  I'm also not sure exactly what
> > > problem you're trying to solve - why exactly does it matter if two PCI
> > > busses share a common "domain" or not?
> >
> > Read the C comment in my first mail. X.org wants to have some
> > information NetBSD currently doesn't provide to userland.
> > This is what I rather want to discuss.
>
> Is that the comment that starts "With each /dev/pci* we can map
> everything on the same root"?  I'll have to re-read that again to make
> sure I understand what you're saying, but in a nutshell is the reason
> you want to introduce the "PCI domains" concept to keep Xorg happy?
>
> Cheers,
> Simon.
>



-- 
Takayoshi Kochi