lkml.org 
[lkml]   [2001]   [Jun]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Going beyond 256 PCI buses
"David S. Miller" wrote:
> Jeff Garzik writes:
> > Why do you want to make the bus number larger than the PCI bus number
> > register?
>
> This isn't it. What I'm trying to provoke thought on is
> "is there a way to make mindless apps using these syscalls
> work transparently"
>
> I think the answer is no. Apps should really fetch info out
> of /proc/bus/pci and use the controller ioctl.
>
> But someone could surprise me :-)

yeah, those syscalls weren't built with much eye towards the future.
And I don't think they are present in other OS's either...


> > It seems like adding 'unsigned int domain_num' makes more sense, and is
> > more correct. Maybe that implies fixing up other code to use a
> > (domain,bus) pair, but that's IMHO a much better change than totally
> > changing the interpretation of pci_bus::bus_number...
>
> Correct, I agree. But I don't even believe we should be sticking
> the domain thing into struct pci_bus.
>
> It's a platform thing. Most platforms have a single domain, so why
> clutter up struct pci_bus with this value? By this reasoning we could
> say that since it's arch-specific, this stuff belongs in sysdata or
> wherever.

Pretty much any arch with a PCI slot can have multiple domains, now that
hotplug controllers are out and about. So it seems a generic enough
concept to me...


> And this is what is happening right now. So in essence, the work is
> done :-) The only "limiting factor" is that x86 doesn't support
> multiple domains as some other platforms do. So all these hot-plug
> patches just need to use domains properly, and perhaps add domain
> support to X86 when one of these hot-plug capable controllers are
> being used.

point.

Regards,

Jeff


--
Jeff Garzik | Andre the Giant has a posse.
Building 1024 |
MandrakeSoft |
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:17    [W:0.088 / U:0.936 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site