linux-kernel - Re: SNB PCI root information

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Date:	Mon, 18 Jun 2012 16:40:42 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

On Mon, Jun 18, 2012 at 3:30 PM, Ulrich Drepper <drepper@...il.com> wrote:
> On Sat, Jun 16, 2012 at 5:56 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> If ACPI provides a perfectly usable generic way to describe this
>> topology and the vendor BIOS doesn't bother to use it, I'm not very
>> interested in trying to compensate for that BIOS deficiency by adding
>> a bunch of non-portable CPU-specific gunk to Linux.
>
> The problem is that all machines get this wrong.  I've tested varies
> models from Dell and HP and none of them have the _PXM entry and the
> local_cpus fields are wrong.  If there is a reasonably sane way to
> compensate for broken BIOSes it should be considered.  We all know how
> good BIOS authors are...

please check attached one. and  you may append "pci=busnum_node=00:00,80:01"
to change node for root bus.
assume you have two root bus: 00, 80

Thanks

Yinghai

Download attachment "busnum_node.patch" of type "application/octet-stream" (1604 bytes)