ASoC: SOF: Extend the enabled DSP core handling

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

In the current code, we enable a widget core when it is set up and
disable it when it is freed. This is problematic with IPC4 because
widget free is essentially a NOP and all widgets are freed in the
firmware when the pipeline is deleted. This results in a crash during
pipeline deletion when one of it's widgets is scheduled to run on a
secondary core and is powered off when widget is freed. So, change the
logic to enable all cores needed by all the modules in a pipeline when
the pipeline widget is set up and disable them after the pipeline
widget is freed.

Author: broonie

sound/soc/sof/ipc3-topology.c

@@ -493,6 +493,7 @@ static int sof_ipc3_widget_setup_comp_mixer(struct snd_sof_widget *swidget)
 static int sof_ipc3_widget_setup_comp_pipeline(struct snd_sof_widget *swidget)
 {
 	struct snd_soc_component *scomp = swidget->scomp;
+	struct snd_sof_pipeline *spipe = swidget->spipe;
 	struct sof_ipc_pipe_new *pipeline;
 	struct snd_sof_widget *comp_swidget;
 	int ret;
@@ -545,6 +546,7 @@ static int sof_ipc3_widget_setup_comp_pipeline(struct snd_sof_widget *swidget)
 		swidget->dynamic_pipeline_widget);
 
 	swidget->core = pipeline->core;
+	spipe->core_mask |= BIT(pipeline->core);
 
 	return 0;
 

sound/soc/sof/ipc4-topology.c

@@ -656,6 +656,7 @@ static int sof_ipc4_widget_setup_comp_pipeline(struct snd_sof_widget *swidget)
 {
 	struct snd_soc_component *scomp = swidget->scomp;
 	struct sof_ipc4_pipeline *pipeline;
+	struct snd_sof_pipeline *spipe = swidget->spipe;
 	int ret;
 
 	pipeline = kzalloc(sizeof(*pipeline), GFP_KERNEL);
@@ -670,6 +671,7 @@ static int sof_ipc4_widget_setup_comp_pipeline(struct snd_sof_widget *swidget)
 	}
 
 	swidget->core = pipeline->core_id;
+	spipe->core_mask |= BIT(pipeline->core_id);
 
 	if (pipeline->use_chain_dma) {
 		dev_dbg(scomp->dev, "Set up chain DMA for %s\n", swidget->widget->name);
@@ -797,6 +799,7 @@ static int sof_ipc4_widget_setup_comp_mixer(struct snd_sof_widget *swidget)
 static int sof_ipc4_widget_setup_comp_src(struct snd_sof_widget *swidget)
 {
 	struct snd_soc_component *scomp = swidget->scomp;
+	struct snd_sof_pipeline *spipe = swidget->spipe;
 	struct sof_ipc4_src *src;
 	int ret;
 
@@ -819,6 +822,8 @@ static int sof_ipc4_widget_setup_comp_src(struct snd_sof_widget *swidget)
 		goto err;
 	}
 
+	spipe->core_mask |= BIT(swidget->core);
+
 	dev_dbg(scomp->dev, "SRC sink rate %d\n", src->sink_rate);
 
 	ret = sof_ipc4_widget_setup_msg(swidget, &src->msg);
@@ -864,6 +869,7 @@ static int sof_ipc4_widget_setup_comp_process(struct snd_sof_widget *swidget)
 {
 	struct snd_soc_component *scomp = swidget->scomp;
 	struct sof_ipc4_fw_module *fw_module;
+	struct snd_sof_pipeline *spipe = swidget->spipe;
 	struct sof_ipc4_process *process;
 	void *cfg;
 	int ret;
@@ -920,6 +926,9 @@ static int sof_ipc4_widget_setup_comp_process(struct snd_sof_widget *swidget)
 
 	sof_ipc4_widget_update_kcontrol_module_id(swidget);
 
+	/* set pipeline core mask to keep track of the core the module is scheduled to run on */
+	spipe->core_mask |= BIT(swidget->core);
+
 	return 0;
 free_base_cfg_ext:
 	kfree(process->base_config_ext);

sound/soc/sof/sof-audio.c

@@ -46,6 +46,7 @@ static int sof_widget_free_unlocked(struct snd_sof_dev *sdev,
 				    struct snd_sof_widget *swidget)
 {
 	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
+	struct snd_sof_pipeline *spipe = swidget->spipe;
 	struct snd_sof_widget *pipe_widget;
 	int err = 0;
 	int ret;
@@ -87,15 +88,22 @@ static int sof_widget_free_unlocked(struct snd_sof_dev *sdev,
 	}
 
 	/*
-	 * disable widget core. continue to route setup status and complete flag
-	 * even if this fails and return the appropriate error
+	 * decrement ref count for cores associated with all modules in the pipeline and clear
+	 * the complete flag
 	 */
-	ret = snd_sof_dsp_core_put(sdev, swidget->core);
-	if (ret < 0) {
-		dev_err(sdev->dev, "error: failed to disable target core: %d for widget %s\n",
-			swidget->core, swidget->widget->name);
-		if (!err)
-			err = ret;
+	if (swidget->id == snd_soc_dapm_scheduler) {
+		int i;
+
+		for_each_set_bit(i, &spipe->core_mask, sdev->num_cores) {
+			ret = snd_sof_dsp_core_put(sdev, i);
+			if (ret < 0) {
+				dev_err(sdev->dev, "failed to disable target core: %d for pipeline %s\n",
+					i, swidget->widget->name);
+				if (!err)
+					err = ret;
+			}
+		}
+		swidget->spipe->complete = 0;
 	}
 
 	/*
@@ -108,10 +116,6 @@ static int sof_widget_free_unlocked(struct snd_sof_dev *sdev,
 			err = ret;
 	}
 
-	/* clear pipeline complete */
-	if (swidget->id == snd_soc_dapm_scheduler)
-		swidget->spipe->complete = 0;
-
 	if (!err)
 		dev_dbg(sdev->dev, "widget %s freed\n", swidget->widget->name);
 
@@ -134,8 +138,10 @@ static int sof_widget_setup_unlocked(struct snd_sof_dev *sdev,
 				     struct snd_sof_widget *swidget)
 {
 	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
+	struct snd_sof_pipeline *spipe = swidget->spipe;
 	bool use_count_decremented = false;
 	int ret;
+	int i;
 
 	/* skip if there is no private data */
 	if (!swidget->private)
@@ -166,19 +172,23 @@ static int sof_widget_setup_unlocked(struct snd_sof_dev *sdev,
 			goto use_count_dec;
 	}
 
-	/* enable widget core */
-	ret = snd_sof_dsp_core_get(sdev, swidget->core);
-	if (ret < 0) {
-		dev_err(sdev->dev, "error: failed to enable target core for widget %s\n",
-			swidget->widget->name);
-		goto pipe_widget_free;
+	/* update ref count for cores associated with all modules in the pipeline */
+	if (swidget->id == snd_soc_dapm_scheduler) {
+		for_each_set_bit(i, &spipe->core_mask, sdev->num_cores) {
+			ret = snd_sof_dsp_core_get(sdev, i);
+			if (ret < 0) {
+				dev_err(sdev->dev, "failed to enable target core %d for pipeline %s\n",
+					i, swidget->widget->name);
+				goto pipe_widget_free;
+			}
+		}
 	}
 
 	/* setup widget in the DSP */
 	if (tplg_ops && tplg_ops->widget_setup) {
 		ret = tplg_ops->widget_setup(sdev, swidget);
 		if (ret < 0)
-			goto core_put;
+			goto pipe_widget_free;
 	}
 
 	/* send config for DAI components */
@@ -208,15 +218,22 @@ static int sof_widget_setup_unlocked(struct snd_sof_dev *sdev,
 	return 0;
 
 widget_free:
-	/* widget use_count and core ref_count will both be decremented by sof_widget_free() */
+	/* widget use_count will be decremented by sof_widget_free() */
 	sof_widget_free_unlocked(sdev, swidget);
 	use_count_decremented = true;
-core_put:
-	if (!use_count_decremented)
-		snd_sof_dsp_core_put(sdev, swidget->core);
 pipe_widget_free:
-	if (swidget->id != snd_soc_dapm_scheduler)
+	if (swidget->id != snd_soc_dapm_scheduler) {
 		sof_widget_free_unlocked(sdev, swidget->spipe->pipe_widget);
+	} else {
+		int j;
+
+		/* decrement ref count for all cores that were updated previously */
+		for_each_set_bit(j, &spipe->core_mask, sdev->num_cores) {
+			if (j >= i)
+				break;
+			snd_sof_dsp_core_put(sdev, j);
+		}
+	}
 use_count_dec:
 	if (!use_count_decremented)
 		swidget->use_count--;

sound/soc/sof/sof-audio.h

@@ -480,13 +480,15 @@ struct snd_sof_widget {
  * @paused_count: Count of number of PCM's that have started and have currently paused this
 		  pipeline
  * @complete: flag used to indicate that pipeline set up is complete.
+ * @core_mask: Mask containing target cores for all modules in the pipeline
  * @list: List item in sdev pipeline_list
  */
 struct snd_sof_pipeline {
 	struct snd_sof_widget *pipe_widget;
 	int started_count;
 	int paused_count;
 	int complete;
+	unsigned long core_mask;
 	struct list_head list;
 };