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

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Message-ID: <53CF6622.6060803@amd.com>
Date:	Wed, 23 Jul 2014 09:37:06 +0200
From:	Christian König <christian.koenig@....com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Christian König 
	<deathsimple@...afone.de>
CC:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Thomas Hellstrom <thellstrom@...are.com>,
	nouveau <nouveau@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Ben Skeggs <bskeggs@...hat.com>,
	"Deucher, Alexander" <alexander.deucher@....com>
Subject: Re: [Nouveau] [PATCH 09/17] drm/radeon: use common fence implementation
 for fences

Am 23.07.2014 09:31, schrieb Daniel Vetter:
> On Wed, Jul 23, 2014 at 9:26 AM, Christian König
> <deathsimple@...afone.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

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