linux-kernel - Re: IOMMU and graphics cards

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Message-Id: <20090507215933K.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 7 May 2009 21:59:19 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	dwmw2@...radead.org, fujita.tomonori@....ntt.co.jp,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	mingo@...hat.com, airlied@...ux.ie
Subject: Re: IOMMU and graphics cards

On Thu, 7 May 2009 14:15:35 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> On Thu, May 07, 2009 at 11:22:01AM +0100, David Woodhouse wrote:
> > On Thu, 2009-05-07 at 12:01 +0200, Joerg Roedel wrote:
> > > > Looks like the DRM code uses the DMA API.
> > > 
> > > The proprietary drivers make problems so far. For the ATI one I am in
> > > contact with the developers to try to fix it. But I can't do anything
> > > about the other proprietary driver I am aware of :-(
> > 
> > I see no harm in "breaking" code which was already broken. If that's the
> > only reason we're enabling the graphics workaround, let's turn it off.
> 
> Well, it is not that simple. Having no workaround at all will not result
> in working proprietary drivers. More likely is that distros just disable
> the IOMMU because their customers want to use these drivers for working
> 3d acceleration.

Have you already discussed this issue with distribution people?

I'm not sure if they would just disable the IOMMU. They want it for
exotic virtualization features?


> As I wrote in the original mail I think we should just make sure that
> these drivers still work with an IOMMU without disabling device
> isolation.
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