[Intel-gfx] implement 'wait' instruction

[Zhenyu Wang]

On 2010.07.01 11:39:47 -0700, Eric Anholt wrote:
> 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?

No yet, I believe something else like snapshot debug should be used
for that, but some experiment gave me nothing.

'wait' is just handy for me to track thread execution process.

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

ok, I'll push them later.

thanks.

-- 
Open Source Technology Center, Intel ltd.

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