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

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Message-ID: <CAKMK7uGJj+UwcnnzA+fj_=uWPN3i0sneWkoD+wfPJ_8Q6Y-DQg@mail.gmail.com>
Date:	Wed, 23 Jul 2014 09:31:51 +0200
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	Christian König <deathsimple@...afone.de>
Cc:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Christian König <christian.koenig@....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

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.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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