drm/i915/execlists: Include reset depth in traces

Show the reset depth (the tasklet disable count) in the GEM_TRACE to
indicate when we might not expect tasklets to be flushed.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180815135827.25869-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/intel_lrc.c

@@ -1828,7 +1828,8 @@ execlists_reset_prepare(struct intel_engine_cs *engine)
 	struct i915_request *request, *active;
 	unsigned long flags;
 
-	GEM_TRACE("%s\n", engine->name);
+	GEM_TRACE("%s: depth<-%d\n", engine->name,
+		  atomic_read(&execlists->tasklet.count));
 
 	/*
 	 * Prevent request submission to the hardware until we have
@@ -1976,7 +1977,8 @@ static void execlists_reset_finish(struct intel_engine_cs *engine)
 	 */
 	__tasklet_enable_sync_once(&execlists->tasklet);
 
-	GEM_TRACE("%s\n", engine->name);
+	GEM_TRACE("%s: depth->%d\n", engine->name,
+		  atomic_read(&execlists->tasklet.count));
 }
 
 static int intel_logical_ring_emit_pdps(struct i915_request *rq)