drm/i915: Give more details for the active-when-parking warning for the engines

If the we think the engine is still active when we attempt to park it,
we want more details -- so dump the engine state.

References: https://bugs.freedesktop.org/show_bug.cgi?id=103479
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171027110617.31745-4-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 9767586..6895a90 100644 (file)
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1613,14 +1613,20 @@ void intel_engines_park(struct drm_i915_private *i915)
        struct intel_engine_cs *engine;
        enum intel_engine_id id;
 
-       /*
-        * We are committed now to parking the engines, make sure there
-        * will be no more interrupts arriving later.
-        */
-       if (!intel_engines_are_idle(dev_priv))
-               DRM_ERROR("Timeout waiting for engines to idle\n");
-
        for_each_engine(engine, i915, id) {
+               /*
+                * We are committed now to parking the engines, make sure there
+                * will be no more interrupts arriving later and the engines
+                * are truly idle.
+                */
+               if (!intel_engine_is_idle(engine)) {
+                       struct drm_printer p = drm_debug_printer(__func__);
+
+                       DRM_ERROR("%s is not idle before parking\n",
+                                 engine->name);
+                       intel_engine_dump(engine, &p);
+               }
+
                if (engine->park)
                        engine->park(engine);