[Intel-gfx] [PATCH 1/3] drm/i915: Check if the stolen memory "reserved" area is enabled or not

[Chris Wilson]

Quoting Paulo Zanoni (2017-11-14 20:29:49)
> Em Ter, 2017-11-14 às 20:19 +0000, Chris Wilson escreveu:
> >  Only fbc actually depends on stolen allocation to
> > function, and no one complains if fbc is disabled. (There's a sketch
> > out
> > there that we could use a contiguous allocation for fbc if we run out
> > of
> > stolen.)
> 
> ILK_DPFC_CB_BASE (aka FBC_CFB_BASE these days) needs to be programmed
> as an offset of the base of stolen memory, so you'll need to allocate
> this memory in the region that comes right after stolen, or you'll run
> out of bits to write to the register.
> 
> Also, things such as the "last 8mb bug" of BDW/SKL suggest that maybe
> this wouldn't work.
> 
> Unless, of course, you have some plan to work around this.

Nah, just the stuff I was last looking at (powerctx) were physical.

Being able to disable stolen and recover the memory is still on the
wishlist.
-Chris