linux-kernel - Re: [PATCH] ioat2: catch and recover from broken vtd configurations v6

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Date:	Wed, 04 Aug 2010 18:49:25 +0100
From:	David Woodhouse <David.Woodhouse@...el.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lkml@...isli.org" <lkml@...isli.org>
Subject: Re: [PATCH] ioat2: catch and recover from broken vtd
 configurations v6

On Wed, 2010-08-04 at 10:47 -0700, Dan Williams wrote:
> On Fri, Jul 23, 2010 at 3:47 PM, Dan Williams <dan.j.williams@...el.com> wrote:
> > On some platforms (MacPro3,1) the BIOS assigns the ioatdma device to the
> > incorrect iommu causing faults when the driver initializes.  Add a quirk
> > to catch this misconfiguration and try falling back to untranslated
> > operation (which works in the MacPro3,1 case).
> >
> > Assuming there are other platforms with misconfigured iommus teach the
> > ioatdma driver to treat initialization failures as non-fatal (just fail
> > the driver load and emit a warning instead of triggering a BUG_ON).
> >
> > This can be classified as a boot regression since 2.6.32 on affected
> > platforms since the ioatdma module did not autoload prior to that
> > kernel.
> >
> > Cc: <stable@...nel.org>
> > Cc: David Woodhouse <David.Woodhouse@...el.com>
> > Reported-by: Chris Li <lkml@...isli.org>
> > Tested-by: Chris Li <lkml@...isli.org>
> > Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> > ---
> > David, looking for your sign-off to take this final version through my
> > tree.
> 
> Ping.  I'm looking to include this in my 2.6.36 pull request.

Acked-By: David Woodhouse <David.Woodhouse@...el.com>

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


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