Re: Can't allocate resources for PCI video card behind bridge

[Connor Behan]

Sorry for being away over the weekend.
> > Here's how I interpret your lspci at http://pastebin.com/f126dc794;
> > see if it makes sense to you:
> >
> > Bus 00 has a bunch of devices that are built into the laptop.
> > Bus 01 has your built-in VGA below the AGP bridge at 00:01.0.
> > Buses 02-05 are for a laptop CardBus slot below the bridge at 00:02.0.
> > Buses 06-09 are for a laptop CardBus slot below the bridge at 00:02.1.
> > Buses 0a-12 are for things below the docking bridge at 00:04.0.
> >    Buses 0b-0e are for a Dock II CardBus slot below the bridge at 
> > 0a:02.0.
> >    Buses 0f-12 are for a Dock II CardBus slot below the bridge at 
> > 0a:02.1.
> >
> > I don't see your plug-in X1550 card.  If it were there, I suppose the
> > PCI to PCI-E bridge would be on bus 0a, with the actual video device
> > on some secondary bus like 13?
Most of that makes sense, I think the PCI to PCI-E bridge was somewhere 
on bus 0a but the VGA Compatible Controller was definitely bus 02. The 
busses only go up to 0a because I'm using pci=assign-busses. If I don't 
use that, they stop at 12.
> > > It may be that we want the "don't allocate resources for transparent 
> > > bridges"
> > > patch after all:
> > >
> > > diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> > > index ea979f2..586451c 100644
> > > --- a/drivers/pci/setup-bus.c
> > > +++ b/drivers/pci/setup-bus.c
> > > @@ -467,8 +467,12 @@ void __ref pci_bus_size_bridges(struct pci_bus 
> > > *bus)
> > >                  }
> > >          }
> > >
> > > -       /* The root bus? */
> > > -       if (!bus->self)
> > > +       /*
> > > +        * We don't need to allocate PCI bridging windows
> > > +        * for a root bus (everything bridged) or for a
> > > +        * transparent one.
> > > +        */
> > > +       if (!bus->self || bus->self->transparent)
> > >                  return;
> > I don't understand this transparent bridge stuff very well, but it's
> > common for a bridge to support both positive and subtractive decode.
> > In that case, don't we still want to allocate resources for the
> > positive decode windows?
I tried this patch but the kernel I'm using with that applied gives me 
the following dmesg: http://pastebin.com/f7a01c86 and the following 
lspci -vvv: http://pastebin.com/f3e473a13. Are there any other patches 
that claim to solve this? I know it can be solved without patches 
because of that one fluke attempt where it worked - I just had no way of 
knowing which options actually contributed to that success while it 
lasted. The only thing I remember about my dmesg output when I had this 
working was that it did NOT give the "can't allocate resource" errors 
for BARs 7, 8 and 9.
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