Re: IOMMU and graphics cards

FUJITA Tomonori
2009-05-07T11:16:39Z

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

>
> * FUJITA Tomonori <fujita.tomonori@lab.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.