Re: IOMMU and graphics cards

FUJITA Tomonori
2009-05-07T10:43:50Z

On Thu, 07 May 2009 11:22:01 +0100
David Woodhouse <dwmw2@infradead.org> 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.

I also prefer that approach. Adding a workaround for the 'bugs' of the
proprietary drivers doesn't sound a nice idea. Let them to fix the
bugs. It's not difficult at all to convert a driver to use the DMA
API.