Re: [Nouveau] [PATCH 09/17] drm/radeon: use common fence implementation for fences

Christian König
2014-07-23T07:37:20Z

Am 23.07.2014 09:31, schrieb Daniel Vetter:
> On Wed, Jul 23, 2014 at 9:26 AM, Christian König
> <deathsimple@vodafone.de> wrote:
>> It's not a locking problem I'm talking about here. Radeons lockup handling
>> kicks in when anything calls into the driver from the outside, if you have a
>> fence wait function that's called from the outside but doesn't handle
>> lockups you essentially rely on somebody else calling another radeon
>> function for the lockup to be resolved.
> So you don't have a timer in radeon that periodically checks whether
> progress is still being made? That's the approach we're using in i915,
> together with some tricks to kick any stuck waiters so that we can
> reliably step in and grab locks for the reset.

We tried this approach, but it didn't worked at all.

I already considered trying it again because of the upcoming fence
implementation, but reconsidering that when a driver is forced to change
it's handling because of the fence implementation that's just another
hint that there is something wrong here.

Christian.

> -Daniel