linux-kernel - Re: [PATCH] x86,pci: dmi check for mackpro 2.2 mmconf

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Date:	Tue, 22 Jul 2008 18:32:20 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Jack Howarth <howarth@...mo.msbb.uc.edu>
Cc:	linux-kernel@...r.kernel.org, Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH] x86,pci: dmi check for mackpro 2.2 mmconf

On Tuesday, July 22, 2008 6:00 pm Jack Howarth wrote:
> Jesse,
>     I found that patch right after I sent the email. Applying the ASPM
> patch solves the boot hangs on under 2.6.26-git9 built with
> CONFIG_PCIEASPM=y. I am attaching the dmesg log for such a boot
> below. I am a little confused if the patch totally disables aspm on
> my machine or just inhibits the hang. Is there a proc entry I can check
> to monitor that aspm is in use?

It should disable ASPM on pre-1.1 PCIe devices, since apparently many of them 
get ASPM wrong, resulting in bus hangs.  There's a file in sysfs to control 
things:
/sys/module/pcie_aspm/parameters/policy
(see the description in 7d715a6c1ae5785d00fb9a876b5abdfc43abc44b for info).

With the patch applied hopefully it indicates that things are disabled.

Thanks for testing.

Jesse
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