linux-kernel - Re: IOMMU and graphics cards

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Message-Id: <20090507201538U.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 7 May 2009 20:14:48 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, airlied@...ux.ie,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	mingo@...hat.com, dwmw2@...radead.org
Subject: Re: IOMMU and graphics cards

On Thu, 7 May 2009 13:01:35 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > > 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 don't know anything about the graphic drivers but are there any 
> > other proprietary drivers except for ATI and AMD? Fixing only two 
> > drivers to make the majority happy?
> 
> ATI ~== AMD these days. The problem is Nvidia cards stuck into AMD 
> systems.

Oops, I meant ATI and Nvidia.


> I guess refusing those DMA accesses (and printing something 
> meaningful and relentlessly honest so that the user knows where the 
> problem comes from) is the proper solution.

Refusing DMA means that we will break these broken drivers. That's
what David and I like. Yeah, telling users explicitly who is to blame
for the problem is even better.

> There will be some 
> end-user moaning, there might be distros turning off the IOMMU code 
> summarily, but nvidia-in-AMD-box is an unfriendly alliance to begin 
> with.
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