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

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Message-ID: <20080723014137.GA12895@bromo.msbb.uc.edu>
Date:	Tue, 22 Jul 2008 21:41:37 -0400
From:	Jack Howarth <howarth@...mo.msbb.uc.edu>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-kernel@...r.kernel.org, Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH] x86,pci: dmi check for mackpro 2.2 mmconf

Jesse,
   The file /sys/module/pcie_aspm/parameters/policy
shows...

[default] performance powersave 

Reading the original patch, I don't quite see how it would
show the aspm as disabled. I would think the current ASPM
fix patch should be modified to output a kernel message that
ASPM is being disabled because of pre-1.1 PCIe devices
when it does that (assuming it is disabling across the
board and not just for a specific device on the bus).
                         Jack

On Tue, Jul 22, 2008 at 06:32:20PM -0700, Jesse Barnes wrote:
> 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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