Quoting Mika Kuoppala (2019-02-18 12:49:31)
> Chris Wilson <[email protected]> writes:
> 
> > When RECOVERABLE is set, the kernel will attempt to automatically recover
> > a context after a hang. But if it is unset, the kernel will ban the
> > guilty context on a hang, preventing subsequent execution.
> >
> > v2: Create a has_recoverable_param()
> >
> > Signed-off-by: Chris Wilson <[email protected]>
> > Cc: Mika Kuoppala <[email protected]>
> 
> Reviewed-by: Mika Kuoppala <[email protected]>
> 
> Not a topic for this testcase but just brought up thoughts
> that we could reap ppgtt and some selected bits in driver
> when we ban. Perhaps a future exercise.

Interesting thought. What I would suggest is that you replace the
file_priv->context_idr entry with a stub and then the old context and
gubbins will die naturally as soon as the requests disappear.

As you can't acquire the lock inside reset, you would need to queue a
worker to fixup the idr later.
-Chris
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