[Intel-gfx] [RFC] drm/i915: context support unit test-r2

[Ben Widawsky]

Another update to the unit test which shows resubmission of the context
on failure. This was brought up by Daniel Vetter. The first version of
context support will require the client to resubmit context if any of
the buffers associated with the context have moved.

Use case works like this
term1> ./gem_ctx_basic #start test, blit and setup context
term2> sudo ./gem_fill #fill up the GTT
term1> <enter>  #run the contexted blit, which will fail since context
>------->-------#buffers have been evicted
term2> <enter>  #remove all crap from gtt
term1> <enter>  # try blit again restoring context

Any comments are welcome.
Ben
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