multi-gpu and reverse prime fixes

Dave Airlie airlied at
Mon Jan 7 17:31:52 PST 2013

So reverse prime (as described on my blog post), is mostly driver side,
however some server fixes were need to make it work well.

The second patch also fixes an issue with USB hotplugged deviecs that we
see right now.

These apply on top of the previous fix for hotplug failure.


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