[Nouveau] [Bug 39010] better handling of large pixmaps

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39010

--- Comment #4 from Andrew Randrianasulu <randrik at mail.ru> 2011-10-30 01:56:11 PDT ---
(In reply to comment #3)
> Created attachment 52905 [details] [review]
> exa: set max dimensions based on available VRAM
> 
> I found a solution!
> 
> Since the VRAM size could vary inside each series of cards (e.g. NV10 cards may
> have 32, 64 or 128 MB VRAM), it would better to set max dimensions based on
> available VRAM instead of card series.
> 
> My proposed patch ensures that we always have enough space in VRAM to process
> images. It fixes memory flush on 64 MB cards, and adds back exa support for
> cards that have 32 MB or less memory (with a minimal 8 MB VRAM).
> 
> I tested this patch only on NV17 with 64 MB VRAM.

Hm .... but those limits may also reflect some hw (family-specific) limits?
What about more complex check? Pseudo : 

if card_family == NV10 
{ if vram >= nv_10_min_ram : exa->maxX= 4096; else exa->maxX = 2046; } 
 elseif card_family == NV50
{ if vram >= nv_50_min_vram : exa->maxX = 8190; else exa->maxX = 4096; }
exa->maxX =  2046
endif

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