[Intel-gfx] implement 'wait' instruction

[Eric Anholt]

On Tue, 29 Jun 2010 11:04:09 +0800, Zhenyu Wang <zhenyuw at linux.intel.com> wrote:
> 
> 'Wait' instruction allows EU to stop and wait notification
> register state clear to continue the execution. And we can
> clear the notifications through MMIO, so we can track EU
> execution step by step.
> 
> I use below patch for implement 'wait' in mesa, and attach
> 'intel_eu_cont.c' program to kick EU to continue. This is
> useful in debugging sandybridge for me.

Interesting.  So are you able to get any more information out besides
"somebody is waiting"?  Inspect register state, instruction pointer,
anything?

I can see how just getting "somebody is waiting" would be useful,
though, so I'd be happy to see these patches land.
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