linux-kernel - Re: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled

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Message-Id: <1239468764.712.1546.camel@macbook.infradead.org>
Date:	Sat, 11 Apr 2009 09:52:39 -0700
From:	David Woodhouse <dwmw2@...radead.org>
To:	Kyle McMartin <kyle@...hat.com>
Cc:	Matthew Garrett <mjg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Lutomirski <amluto@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Mark Gross <mgross@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29: can't resume from suspend with DMAR (intel iommu)
 enabled

On Sat, 2009-04-11 at 10:38 -0400, Kyle McMartin wrote:
> On Fri, Apr 10, 2009 at 11:04:12PM -0700, David Woodhouse wrote:
> > On Tue, 2009-04-07 at 08:56 +0100, Matthew Garrett wrote:
> > > On Mon, Apr 06, 2009 at 01:56:01PM -0700, David Woodhouse wrote:
> > > 
> > > > Dirk reported the same panic, but we've just turned his iommu back on
> > > > and completely failed to reproduce the problem -- so I'm kind of stuck.
> > > 
> > > I saw this on a T400, but only on the first boot after enabling DMAR - 
> > > power cycling "fixed" it.
> > 
> > OK, that should be fixed (amongst other things) in
> > git.infradead.org/users/dwmw2/iommu-suspend-2.6.29.git and in the Fedora
> > 2.6.29.1-68.fc11 kernel. Thanks.
> > 
> > http://www.kerneloops.org/raw.php?rawid=346794
> > 
> 
> Does this include backporting the interrupt remapping fixes, or just
> ignoring it since none of the current laptop chipsets support it?

The latter. What I've done so far is quite large for a -stable
submission already. The interrupt remapping stuff would be even more
intrusive, and I'm entirely unconvinced that we actually _need_ it for
current systems.

I could make it refuse to suspend in intr_remap is enabled, I suppose --
that would be simple enough.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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