linux-kernel - Re: IOMMU and graphics cards

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Message-ID: <20090706131156.GL5380@amd.com>
Date:	Mon, 6 Jul 2009 15:11:56 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	David Woodhouse <dwmw2@...radead.org>
CC:	Joerg Roedel <joro@...tes.org>,
	Zhenyu Wang <zhenyu.z.wang@...el.com>, airlied@...ux.ie,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	iommu@...ts.linux-foundation.org, mingo@...hat.com,
	David Miller <davem@...emloft.net>
Subject: Re: IOMMU and graphics cards

On Mon, Jul 06, 2009 at 01:26:17PM +0100, David Woodhouse wrote:
> On Fri, 2009-05-08 at 11:35 +0200, Joerg Roedel wrote:
> > The other way to achieve consistency is to remove the workaround from
> > VT-d code which significantly increases the chance to get the broken
> > stuff fixed. David?
> 
> It's gone from 2.6.31-rc2, but even the in-tree drivers break, so I
> think we have to put it back for 2.6.31 (I've sent Linus the pull
> request already). 
> 
> I do intend to remove it again for 2.6.32 though, and I filed 
> http://bugzilla.kernel.org/show_bug.cgi?id=13721
> 
> For now it's got a clearer description ("Workaround broken graphics
> drivers") and defaults to 'n'.

Ok, cool, that sounds good. Which in-kernel DRM drivers break with IOMMU
for you? I'll may probably add a similar temporary workaround for AMD
IOMMU too...

	Joerg

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