linux-kernel - Re: [PATCH v1 0/7] PCI: try enabling "pci=use

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Message-Id: <201002041555.28365.bjorn.helgaas@hp.com>
Date:	Thu, 4 Feb 2010 15:55:26 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Tony Luck <tony.luck@...el.com>, linux-pci@...r.kernel.org,
	Peter Haight <peterh@...ros.com>,
	Gary Hade <garyhade@...ibm.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v1 0/7] PCI: try enabling "pci=use_crs" again

On Thursday 04 February 2010 10:55:57 am Bjorn Helgaas wrote:
> On Wednesday 03 February 2010 09:37:43 pm Larry Finger wrote:

> > In addition to the above, my system now boots with "pci=use_crs", unlike when I
> > filed the Bugzilla.
> 
> Huh.  From http://lkml.org/lkml/2009/6/24/11, I had assumed the main
> problem was that we overflowed the 16-entry bus resource table, but
> there must be more to it.
> 
> If you can build and boot the linux-next branch with my patches and
> collect the dmesg log, maybe it will have a clue.  You can boot without
> "pci=use_crs"; I don't think that will make any difference on your box.

Thanks for testing these and collecting the dmesg log
(http://bugzilla.kernel.org/attachment.cgi?id=24914).  That
log is from the PCI linux-next branch plus my patches, without
using "pci=use_crs".

On the current upstream (e.g., the c80d292 kernel you started with),
we have PCI_BUS_NUM_RESOURCES == 16.  Your _CRS returns 17 windows
(the "pci_root PNP0A08:00 host bridge window" lines), so when you
boot with "pci=use_crs", we should be discarding the last window,
which is an important one:

  pci_root PNP0A08:00: host bridge window [mem 0xc0000000-0xfebfffff]

Can you collect the dmesg log from the c80d292 kernel with "pci=use_crs"?
I'm sorry to trouble you for this, but it still looks to me like that
should fail, so I'd really like to understand why it's working.

Bjorn
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