[Bug 67600] [HSW] gen7_queue_flip doesn't work on RCS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67600

--- Comment #6 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #0)
> Created attachment 83409 [details]
> i915_error_state
> 
> I noticed that on IVB, page flips ioctls end up blocking when the GPU is
> busy. Specifically the RCS -> BCS ring switch seems to be what's taking time
> (this time is spent in i915_gem_object_pin_to_display_plane).

Ok, Ben is looking into why pageflipping on the RCS doesn't work, since he
thinks it should.

Orthogonal to that issue we shouldn't block in pin_to_display_plane, at least
if semaphores are enabled (which they are by default). Stephane can you please
dig into where exactly we blow through massive amounts of time in there?

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