drm/i915: Show all active engines on hangcheck

This turns out to be quite useful if one happens to be debugging
semaphore deadlocks.

Signed-off-by: Chris Wilson <[e-mail]>
Reviewed-by: Mika Kuoppala <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/intel_hangcheck.c

···
 		break;
 
 	case ENGINE_DEAD:
-		if (GEM_SHOW_DEBUG()) {
-			struct drm_printer p = drm_debug_printer("hangcheck");
-			intel_engine_dump(engine, &p, "%s\n", engine->name);
-		}
 		break;
 
 	default:
···
 
 		if (engine->hangcheck.wedged)
 			wedged |= intel_engine_flag(engine);
+	}
+
+	if (GEM_SHOW_DEBUG() && (hung | stuck)) {
+		struct drm_printer p = drm_debug_printer("hangcheck");
+
+		for_each_engine(engine, dev_priv, id) {
+			if (intel_engine_is_idle(engine))
+				continue;
+
+			intel_engine_dump(engine, &p, "%s\n", engine->name);
+		}
 	}
 
 	if (wedged) {