[Intel-gfx] [PATCH 1/2] drm/i915: Kill i915_gem_execbuffer_wait_for_flips()

[Eric Anholt]

ville.syrjala at linux.intel.com writes:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> As per Chris Wilson's suggestion make
> i915_gem_execbuffer_wait_for_flips() go away.
>
> This was used to stall the GPU ring while there are pending
> page flips involving the relevant BO. Ie. while the BO is still
> being scanned out by the display controller.
>
> The recommended alternative is to use the page flip events to
> wait for the page flips to fully complete before reusing the BO
> of the old front buffer. Or use more buffers.

So, after this change, if userland submits an execbuf between having
requested a pageflip and the vblank that the flip shows up on, does that
exec block?
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