drm/i915: Generalise wait for execlists to be idle

The code to check for execlists completion is generic, so move it to
intel_engine_cs.c, where we can reuse the new intel_engine_is_idle().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303121947.20482-2-chris@chris-wilson.co.ukReviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

drivers/gpu/drm/i915/i915_gem.c

@@ -2959,8 +2959,8 @@ i915_gem_idle_work_handler(struct work_struct *work)
 	 * new request is submitted.
 	 */
 	wait_for(READ_ONCE(dev_priv->gt.active_requests) ||
-		 intel_execlists_idle(dev_priv), 10);
-
+		 intel_engines_are_idle(dev_priv),
+		 10);
 	if (READ_ONCE(dev_priv->gt.active_requests))
 		return;
 
@@ -2985,7 +2985,7 @@ i915_gem_idle_work_handler(struct work_struct *work)
 	if (dev_priv->gt.active_requests)
 		goto out_unlock;
 
-	if (wait_for(intel_execlists_idle(dev_priv), 10))
+	if (wait_for(intel_engines_are_idle(dev_priv), 10))
 		DRM_ERROR("Timeout waiting for engines to idle\n");
 
 	for_each_engine(engine, dev_priv, id) {
@@ -4287,7 +4287,7 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	 * reset the GPU back to its idle, low power state.
 	 */
 	WARN_ON(dev_priv->gt.awake);
-	WARN_ON(!intel_execlists_idle(dev_priv));
+	WARN_ON(!intel_engines_are_idle(dev_priv));
 
 	/*
 	 * Neither the BIOS, ourselves or any other kernel

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -1102,6 +1102,19 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
 	return true;
 }
 
+bool intel_engines_are_idle(struct drm_i915_private *dev_priv)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, dev_priv, id) {
+		if (!intel_engine_is_idle(engine))
+			return false;
+	}
+
+	return true;
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/mock_engine.c"
 #endif

drivers/gpu/drm/i915/intel_lrc.c

@@ -498,34 +498,6 @@ static bool execlists_elsp_idle(struct intel_engine_cs *engine)
 	return !engine->execlist_port[0].request;
 }
 
-/**
- * intel_execlists_idle() - Determine if all engine submission ports are idle
- * @dev_priv: i915 device private
- *
- * Return true if there are no requests pending on any of the submission ports
- * of any engines.
- */
-bool intel_execlists_idle(struct drm_i915_private *dev_priv)
-{
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-
-	if (!i915.enable_execlists)
-		return true;
-
-	for_each_engine(engine, dev_priv, id) {
-		/* Interrupt/tasklet pending? */
-		if (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted))
-			return false;
-
-		/* Both ports drained, no more ELSP submission? */
-		if (!execlists_elsp_idle(engine))
-			return false;
-	}
-
-	return true;
-}
-
 static bool execlists_elsp_ready(const struct intel_engine_cs *engine)
 {
 	const struct execlist_port *port = engine->execlist_port;

drivers/gpu/drm/i915/intel_lrc.h

@@ -88,6 +88,5 @@ uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx,
 int intel_sanitize_enable_execlists(struct drm_i915_private *dev_priv,
 				    int enable_execlists);
 void intel_execlists_enable_submission(struct drm_i915_private *dev_priv);
-bool intel_execlists_idle(struct drm_i915_private *dev_priv);
 
 #endif /* _INTEL_LRC_H_ */

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -665,5 +665,6 @@ static inline u32 *gen8_emit_pipe_control(u32 *batch, u32 flags, u32 offset)
 }
 
 bool intel_engine_is_idle(struct intel_engine_cs *engine);
+bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
 
 #endif /* _INTEL_RINGBUFFER_H_ */

drivers/gpu/drm/i915/selftests/i915_gem_request.c

@@ -303,7 +303,7 @@ static int end_live_test(struct live_test *t)
 {
 	struct drm_i915_private *i915 = t->i915;
 
-	if (wait_for(intel_execlists_idle(i915), 1)) {
+	if (wait_for(intel_engines_are_idle(i915), 1)) {
 		pr_err("%s(%s): GPU not idle\n", t->func, t->name);
 		return -EIO;
 	}