ASoC: SOF: topology: Add kernel parameter for topology verification

Add a kernel debug flag to enable a one-shot topology
verification for all pipelines including the dynamic
ones. If the debug flag is set, all the topology
component loading will be verified during the complete
callback.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20210927120517.20505-13-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: ranj063

sound/soc/sof/pm.c

@@ -157,7 +157,7 @@ static int sof_resume(struct device *dev, bool runtime_resume)
 	}
 
 	/* restore pipelines */
-	ret = sof_set_up_pipelines(sdev->dev);
+	ret = sof_set_up_pipelines(sdev->dev, false);
 	if (ret < 0) {
 		dev_err(sdev->dev,
 			"error: failed to restore pipeline after resume %d\n",
@@ -208,7 +208,7 @@ static int sof_suspend(struct device *dev, bool runtime_suspend)
 	if (target_state == SOF_DSP_PM_D0)
 		goto suspend;
 
-	sof_tear_down_pipelines(dev);
+	sof_tear_down_pipelines(dev, false);
 
 	/* release trace */
 	snd_sof_release_trace(sdev);

sound/soc/sof/sof-audio.c

@@ -589,7 +589,7 @@ const struct sof_ipc_pipe_new *snd_sof_pipeline_find(struct snd_sof_dev *sdev,
 	return NULL;
 }
 
-int sof_set_up_pipelines(struct device *dev)
+int sof_set_up_pipelines(struct device *dev, bool verify)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	struct snd_sof_widget *swidget;
@@ -599,7 +599,7 @@ int sof_set_up_pipelines(struct device *dev)
 	/* restore pipeline components */
 	list_for_each_entry_reverse(swidget, &sdev->widget_list, list) {
 		/* only set up the widgets belonging to static pipelines */
-		if (swidget->dynamic_pipeline_widget)
+		if (!verify && swidget->dynamic_pipeline_widget)
 			continue;
 
 		/* update DAI config. The IPC will be sent in sof_widget_setup() */
@@ -630,8 +630,8 @@ int sof_set_up_pipelines(struct device *dev)
 	list_for_each_entry(sroute, &sdev->route_list, list) {
 
 		/* only set up routes belonging to static pipelines */
-		if (sroute->src_widget->dynamic_pipeline_widget ||
-		    sroute->sink_widget->dynamic_pipeline_widget)
+		if (!verify && (sroute->src_widget->dynamic_pipeline_widget ||
+				sroute->sink_widget->dynamic_pipeline_widget))
 			continue;
 
 		ret = sof_route_setup_ipc(sdev, sroute);
@@ -646,7 +646,7 @@ int sof_set_up_pipelines(struct device *dev)
 		switch (swidget->id) {
 		case snd_soc_dapm_scheduler:
 			/* only complete static pipelines */
-			if (swidget->dynamic_pipeline_widget)
+			if (!verify && swidget->dynamic_pipeline_widget)
 				continue;
 
 			swidget->complete =
@@ -661,24 +661,37 @@ int sof_set_up_pipelines(struct device *dev)
 }
 
 /*
- * This function doesn't free widgets. It only resets the set up status for all routes and
- * use_count for all widgets.
+ * This function doesn't free widgets during suspend. It only resets the set up status for all
+ * routes and use_count for all widgets.
  */
-void sof_tear_down_pipelines(struct device *dev)
+int sof_tear_down_pipelines(struct device *dev, bool verify)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	struct snd_sof_widget *swidget;
 	struct snd_sof_route *sroute;
+	int ret;
 
 	/*
-	 * No need to protect swidget->use_count and sroute->setup as this function is called only
-	 * during the suspend callback and all streams should be suspended by then
+	 * This function is called during suspend and for one-time topology verification during
+	 * first boot. In both cases, there is no need to protect swidget->use_count and
+	 * sroute->setup because during suspend all streams are suspended and during topology
+	 * loading the sound card unavailable to open PCMs.
 	 */
-	list_for_each_entry(swidget, &sdev->widget_list, list)
-		swidget->use_count = 0;
+	list_for_each_entry_reverse(swidget, &sdev->widget_list, list) {
+		if (!verify) {
+			swidget->use_count = 0;
+			continue;
+		}
+
+		ret = sof_widget_free(sdev, swidget);
+		if (ret < 0)
+			return ret;
+	}
 
 	list_for_each_entry(sroute, &sdev->route_list, list)
 		sroute->setup = false;
+
+	return 0;
 }
 
 /*

sound/soc/sof/sof-audio.h

@@ -246,8 +246,8 @@ int snd_sof_ipc_set_get_comp_data(struct snd_sof_control *scontrol,
 int sof_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_params *params);
 
 /* PM */
-int sof_set_up_pipelines(struct device *dev);
-void sof_tear_down_pipelines(struct device *dev);
+int sof_set_up_pipelines(struct device *dev, bool verify);
+int sof_tear_down_pipelines(struct device *dev, bool verify);
 int sof_set_hw_params_upon_resume(struct device *dev);
 bool snd_sof_stream_suspend_ignored(struct snd_sof_dev *sdev);
 bool snd_sof_dsp_only_d0i3_compatible_stream_active(struct snd_sof_dev *sdev);

sound/soc/sof/sof-priv.h

@@ -23,6 +23,7 @@
 /* debug flags */
 #define SOF_DBG_ENABLE_TRACE	BIT(0)
 #define SOF_DBG_RETAIN_CTX	BIT(1)	/* prevent DSP D3 on FW exception */
+#define SOF_DBG_VERIFY_TPLG	BIT(2) /* verify topology during load */
 
 #define SOF_DBG_DUMP_REGS		BIT(0)
 #define SOF_DBG_DUMP_MBOX		BIT(1)

sound/soc/sof/topology.c

@@ -3452,8 +3452,23 @@ static int sof_complete(struct snd_soc_component *scomp)
 		}
 	}
 
+	/* verify topology components loading including dynamic pipelines */
+	if (sof_core_debug & SOF_DBG_VERIFY_TPLG) {
+		ret = sof_set_up_pipelines(scomp->dev, true);
+		if (ret < 0) {
+			dev_err(sdev->dev, "error: topology verification failed %d\n", ret);
+			return ret;
+		}
+
+		ret = sof_tear_down_pipelines(scomp->dev, true);
+		if (ret < 0) {
+			dev_err(sdev->dev, "error: topology tear down pipelines failed %d\n", ret);
+			return ret;
+		}
+	}
+
 	/* set up static pipelines */
-	return sof_set_up_pipelines(scomp->dev);
+	return sof_set_up_pipelines(scomp->dev, false);
 }
 
 /* manifest - optional to inform component of manifest */