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Cc: jmg@freebsd.org, perforce@freebsd.org
Subject: Re: PERFORCE change 94510 for review
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From: John Baldwin <jhb@freebsd.org>
Subject: Re: PERFORCE change 94510 for review
Date: Mon, 3 Apr 2006 15:03:40 -0400

> On Monday 03 April 2006 02:41, John-Mark Gurney wrote:
> > http://perforce.freebsd.org/chv.cgi?CH=94510
> > 
> > Change 94510 by jmg@jmg_arlene on 2006/04/03 06:40:19
> > 
> > 	don't force the unit number to match the bus number, this breaks
> > 	machines with multiple pci domains... how the alpha worked with
> > 	this is beyond me (besides using custom pci bridge drivers?)
> 
> Alpha has issues with hoses.  That said, this might break some things. :(
> If nothing else, it makes it nearly impossible now for people to get the
> names of hints to override things like PCI routing via tunables correct.
> I would prefer a structured solution that preserved the status quo on
> machines w/o multiple domains.  Maybe have the unit number be something
> like domain * X + bus number, where X is some arbitrary constant like
> 100 or 1000 (those are better for human parsing).

We override the pci unit number to act as a bus number in passing data
into the kernel for pciconf.

Warner