linux-kernel - Re: SNB PCI root information

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Message-ID: <CAE9FiQUkGCQ0Y=n3i=bq388T8N-vrHP2LtMTFGwry2nA+uppwA@mail.gmail.com>
Date:	Wed, 20 Jun 2012 19:43:22 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Brice Goglin <brice.goglin@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ulrich Drepper <drepper@...il.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 Wed, Jun 20, 2012 at 12:57 PM, Brice Goglin <brice.goglin@...il.com> wrote:
> Le 20/06/2012 21:28, Yinghai Lu a écrit :
>> On Wed, Jun 20, 2012 at 11:46 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>
> I agree that the most common problem is that _PXM is missing. But I've
> seen at least some HP Westmere-EP platforms where _PXM exists but it is
> wrong. Last time we checked, there was no BIOS update, even if we
> reported the bug a while ago.
>
Do you have boot log or acpi dump?

I suspected that could be other problem. intel system before
sandbridge does not have IIO.
they will have ioh instead, and one ioh would connect to two cpu sockets.
but _PXM for root bus in dsdt only can return one value. Aka it is
acpi spec limitation.

for example, Sun x4800 8 sockets server would have bus 00, 40, 80, c0.
but _PXM will only return 0, 2, 3, 6.

Thanks

Yinghai
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