Nouveau - Apr 2010 - Gart to vram/vram to gart transfers broken on NVS 140M

Hi Nouveau folks,

I've been encountering some corruption on pixmaps for a while now, and 
it seems like the problem comes from the DFS/UTS (Download From Screen / 
Upload To Screen).

In fact, I'm pretty sure the problem comes from there as screenshots are 
garbled and so does a few more things.

I may have time to dig this up, where should I start, is there some 
documentation on the NVS 140M ? Where is the gart2vram code located ?
Do you have any idea of where could be the problem ?

Thanks,

Martin

On Thu, Apr 22, 2010 at 03:13, Martin Peres <martin.peres at free.fr>
wrote:
> Hi Nouveau folks,
>
> I've been encountering some corruption on pixmaps for a while now, and
it
> seems like the problem comes from the DFS/UTS (Download From Screen /
Upload
> To Screen).
>
> In fact, I'm pretty sure the problem comes from there as screenshots
are
> garbled and so does a few more things.
>
> I may have time to dig this up, where should I start, is there some
> documentation on the NVS 140M ? Where is the gart2vram code located ?
> Do you have any idea of where could be the problem ?
>
If you really think that's UTS/DFS, edit nouveau_exa.c and disable
them (change the UTS/DFS functions to return FALSE, that'll trigger
fallbacks to sw copying).

Stephane