[Intel-gfx] [PATCH] drm/i915: Let execlist_update_context() cover !FULL_PPGTT mode.

[Chris Wilson]

On Mon, Feb 06, 2017 at 07:03:39PM +0800, Zhi Wang wrote:
> Thanks for the merging. I guess that with your patches of keeping PD
> structure under aliasing PPGTT mode in 32bit page table, the amount
> of PDPs will not change anymore under aliasing PPGTT mode. :P

Yes. That's the idea atm, we will preallocate the aliasing table
and then keep the tree intact. The only disadvantage with gen8+ aliasing
mode (compared to gen6) will be that we still have to walk the va range
to pin the tree so that when we call clear_range afterwards we don't
reap. The benefit from my pov, is that the special case for
aliasing_ppgtt is within the aliasing_ppgtt code and not in the common
code (which should be optimised for full-ppgtt as that is the
default/typical use).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre