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

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Message-Id: <200705021057.31393.jbarnes@virtuousgeek.org>
Date:	Wed, 2 May 2007 10:57:30 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
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 7:34 am Robert Hancock wrote:
> Jesse Barnes wrote:
> > On Tuesday, May 01, 2007, Jesse Barnes wrote:
> >>> I'm testing it now on my 965...
> >>
> >> Bah... nevermind Robert, I see you're doing this already in
> >> pci_mmcfg_reject_broken.  I'm about to reboot & test now.
> >
> > Ok, I've tested a bit on my 965 (after re-adding my old patch to
> > support it) and the new checks are more complete, but my BIOS still
> > appears to be buggy.
> >
> > The extended config space (as defined by the register) is at
> > 0xf0000000 (full value is 0xf0000003 indicating 128M enabled).  The
> > ACPI MCFG table has this space reserved according to Robert's new
> > code, but the machine hangs due to the address space aliasing
> > Olivier mentioned awhile back.  I don't have a PCIe card to test
> > with (or any devices that require extended config space that I know
> > of) so I can't really tell if Windows supports PCIe on this
> > platform, but if it does I don't see how it would w/o having a full
> > bridge driver and sophisticated address space allocation builtin.
>
> Windows XP doesn't use MMCONFIG or any extended configuration space.
> I believe Vista is supposed to, though. Not sure how they are
> handling this issue.

Oh right... Vista will be the first to fully support PCIe & mcfg...

> Can you post what your board has for PNPACPI reserved resources (I
> believe they're in /sys/devices/pnp0/*/resources IIRC, don't have a
> Linux box handy right now). Full dmesg would also be useful, I think
> it dumps out those reservations at boot nowadays..

BIOS update didn't help.  Here's the boot log and a dump of the pnp0 
resources.

Jesse

View attachment "pnp.out" of type "text/plain" (691 bytes)

View attachment "boot.out" of type "text/plain" (25551 bytes)