linux-kernel - Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources

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Message-Id: <200705041406.59584.jesse.barnes@intel.com>
Date:	Fri, 4 May 2007 14:06:59 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Olivier Galibert <galibert@...ox.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Chuck Ebbert <cebbert@...hat.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources

On Wednesday, May 2, 2007 4:54 pm Jesse Barnes wrote:
> > What happens if you take out the chipset register detection, does
> > the MCFG table give you the same result? Wonder if they're doing
> > something funny with start/end bus values or something in their
> > table. There's some code in my patch that prints out the important
> > data from the MCFG table, can you tell me what that shows with the
> > chipset detection taken out?
>
> Yeah, I'll look a little more closely.  It could also be that another
> register needs tweaking somewhere to actually get the bridge to
> decode the space.
>
> > If that doesn't provide any useful information, I think we may need
> > some assistance from Intel chipset/motherboard people to figure out
> > what is going on here..
>
> I'm talking with them now, hopefully they'll shed some light on it.

I did a little more debugging this morning, and found that I can 
actually do reads from the space described by ACPI and the device 
register, but later when ACPI actually scans the root bridges, it 
hangs.  Specifically the call to pci_acpi_scan_root in 
pci_root.c:acpi_pci_root_add() never seems to return.

I'll walk through that logic when I get back to my test box, but it's 
also worth noting that Vista's MCFG on this machine apparently works ok 
too.

Jesse
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