[Intel-gfx] [PATCH 10/11] drm/i915: bind objects to the global gtt only when needed

[Eric Anholt]

On Mon, 28 Nov 2011 22:24:54 +0100, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> And track the existence of such a binding similar to the aliasing
> ppgtt case. Speeds up binding/unbinding in the common case where we
> only need a ppgtt binding (which is accessed in a cpu coherent fashion
> by the gpu) and no gloabl gtt binding (which needs uc writes for the
> ptes).

For one month from mid-june to mid-july, Mesa master was setting
I915_GEM_DOMAIN_GTT in the workaround pipe control.  That was changed to
be _INSTRUCTION, because _GTT caused kernel oopses, and query objects
had already been doing _INSTRUCTION since forever.  There are no uses of
MI_STOREs in the driver.

I'd say the minor ABI change potential in here is safe.
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