Re: [PATCH] drm/radeon: TTM must be init with cpu-visible VRAM

[Lauri Kasanen <cand@gmx.com>]

On Fri, 28 Feb 2014 10:36:59 +0100
Christian König <deathsimple@vodafone.de> wrote:

> Am 27.02.2014 22:38, schrieb Lauri Kasanen:
> > Without this, a bo may get created in the cpu-inaccessible vram.
> > Before the CP engines get setup, all copies are done via cpu memcpy.
> >
> > This means that the cpu tries to read from inaccessible memory, fails,
> > and the radeon module proceeds to disable acceleration.
> >
> > Doing this has no downsides, as the real VRAM size gets set as soon as the
> > CP engines get init.
> >
> > This is a candidate for 3.14 fixes.
> 
> This should be unnecessary, since TTM gets initialized only seeing the 
> visible VRAM and later on radeon_ttm_set_active_vram_size gets called to 
> increase the limit.
> 
> If this isn't the case any more we should figure out why instead of 
> working around it like this.

Negative, TTM gets initialized with real_vram just a few lines above
this patch, not visible_vram.

- Lauri