From: Chris Wilson <chris@chris-wilson.co.uk>
To: Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [PATCH] drm/i915: dump even more into the error_state
Date: Wed, 01 Feb 2012 21:39:15 +0000 [thread overview]
Message-ID: <c55c5d$1rb40j@AZSMGA002.ch.intel.com> (raw)
In-Reply-To: <1328131605-20174-1-git-send-email-daniel.vetter@ffwll.ch>
On Wed, 1 Feb 2012 22:26:45 +0100, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> Chris Wilson and me have again stared at funny error states and it's
> been pretty clear from the start that something was seriously amiss.
> The seqnos last seen by the cpu were a few hundred behind those that
> the gpu could have possibly emitted last before it died ...
>
> Chris now tracked it down (hopefully, definit verdict's still out),
> but in hindsight we'd have found the bug by simply dumping the cpu
> side tracking of the ring head and tail registers.
>
> Fix this and prevent an identical time-waster in the future.
>
> Because the hangs always involved semaphores in one way or another,
> we've tried to dump the mbox registers, but couldn't find any
> inconsistencies. Still, dump them too.
>
> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-and-wanted-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
next prev parent reply other threads:[~2012-02-01 21:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 21:26 [PATCH] drm/i915: dump even more into the error_state Daniel Vetter
2012-02-01 21:39 ` Chris Wilson [this message]
2012-02-02 0:23 ` Eugeni Dodonov
2012-02-09 14:52 ` Daniel Vetter
2012-02-04 2:23 ` Ben Widawsky
2012-02-04 10:45 ` Chris Wilson
2012-02-04 19:55 ` Ben Widawsky
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