From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 25 Sep 2013 10:43:28 +0000 (+0100)
Subject: drm/i915: Add a tracepoint for using a semaphore
X-Git-Tag: v3.13-rc1~76^2~80^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b52b89da097896ac265d1f875aeb0bfd92a9dd38;p=pandora-kernel.git

drm/i915: Add a tracepoint for using a semaphore

So that we can find the callers who introduce a ring stall. A single
ring stall is not too unwelcome, the right issue becomes when they start
to interlock and prevent any concurrent work. That, however, is a little
tricker to detect with a mere tracepoint!

v2: Rebrand it as a ring event, rather than an object event.
v3: Include the seqno in the tracepoint for posterity or something.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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