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

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Message-ID: <20080719181921.GB19250@bromo.msbb.uc.edu>
Date:	Sat, 19 Jul 2008 14:19:21 -0400
From:	Jack Howarth <howarth@...mo.msbb.uc.edu>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH] x86,pci: dmi check for mackpro 2.2 mmconf

On Sat, Jul 19, 2008 at 10:26:02AM -0700, Jesse Barnes wrote:
> On Friday, July 18, 2008 10:28 pm Yinghai Lu wrote:
> > On Fri, Jul 18, 2008 at 10:12 PM, Jack Howarth
> >
> > <howarth@...mo.msbb.uc.edu> wrote:
> > >   Would that imply that this might be more fallout of the BIOS bug in the
> > > MacBook Pro where insufficient address space is reserved for the number
> > > of buses claimed?
> >
> > that is good enough with 64 buses like laptop.
> >
> > > Is there some point in the PCIEASPM based code where you
> > > could duplicate the same sort of fix? I would be happy to test any debug
> > > patches that might help pinpoint where such a fix is needed.
> >
> > Jesse, who is maintainer for ASPM code?
> 
> I've been looking to Shaohua (cc'd) for ASPM stuff.
> 
> Jesse

Jesse,
   I have just tried tip with CONFIG_PCIEASPM and I get the same hang as always.
I am currently using 'debug initcall_debug' as I can only see a limited number of
lines on my screen. These show...

PCI: 0000:00:1d.7 reg 10 32bit mmio: [d840500, d84057ff]
pci: 0000:00:1d.7 PME# supported from D0 D3hot D3cold
pci: 0000:00:1d.7 PME# disabled
pci: 0000:00:1f.0 quirk: region 0400-047f claimed by ICH6 ACPI/GPIO/TCO
pci: 0000:00:1f.0 quirk: region 0500-053f claimed by ICH6 GPIO
PCI: 0000:00:1f.1 reg 10 io port: [40d8,40df]
PCI: 0000:00:1f.1 reg 14 io port: [40ec,40ef]
PCI: 0000:00:1f.1 reg 18 io port: [40d0,40d7]
PCI: 0000:00:1f.1 reg 1c io port: [40e8,40eb]
PCI: 0000:00:1f.1 reg 20 io port: [40b0,40bf]
PCI: 0000:00:1f.2 reg 10 io port: [40c8,40cf]
PCI: 0000:00:1f.2 reg 14 io port: [40e4,40e7]
PCI: 0000:00:1f.2 reg 18 io port: [40c0,40c7]
PCI: 0000:00:1f.2 reg 1c io port: [40e0,40e3]
PCI: 0000:00:1f.2 reg 20 io port: [40a0,40af]
PCI: 0000:00:1f.2 reg 24 32bit mmio: [d8405000,d84053ff]
pci: 0000:00:1f.2 PME# supported from D3hot
pci: 0000:00:1f.2 PME# disabled
PCI: 0000:00:1f.3 reg 20 io port [efa0,efbf]
PCI: 0000:01:00.0 reg 10 32bit mmio: [c0000000,cfffffff]
PCI: 0000:01:00.0 reg 14 io port: [3000,30ff]
PCI: 0000:01:00.0 reg 18 32bit mmio: [d8300000,d830ffff]
pci: 0000:01:00.0 : supports D1
pci: 0000:01:00.0 : supports D2

...at which point the machine freezes. If I boot tip with quiet, I happen to
see the message...

ACPI: EC: GPE Storm detected, disabling EC GPE

which I never haven't seen with 2.6.26 built without PCIEASPM. I also
have CONFIG_PCIEASPM_DEBUG set. What options to have have to pass to the
kernel when booting to cause that feature to spew useful info?
                          Jack
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