ASoC: SOF: add widget setup/free tracing

Enables tracking of use_count during widget setup and free routines.
Useful for debugging unbalanced use_counts during suspend/resume.
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Noah Klayman <noah.klayman@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220919122108.43764-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/trace/events/sof.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2022 Intel Corporation. All rights reserved.
+ *
+ * Author: Noah Klayman <noah.klayman@intel.com>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sof
+
+#if !defined(_TRACE_SOF_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SOF_H
+#include <linux/tracepoint.h>
+#include <sound/sof/stream.h>
+#include "../../../sound/soc/sof/sof-audio.h"
+
+DECLARE_EVENT_CLASS(sof_widget_template,
+	TP_PROTO(struct snd_sof_widget *swidget),
+	TP_ARGS(swidget),
+	TP_STRUCT__entry(
+		__string(name, swidget->widget->name)
+		__field(int, use_count)
+	),
+	TP_fast_assign(
+		__assign_str(name, swidget->widget->name);
+		__entry->use_count = swidget->use_count;
+	),
+	TP_printk("name=%s use_count=%d", __get_str(name), __entry->use_count)
+);
+
+DEFINE_EVENT(sof_widget_template, sof_widget_setup,
+	TP_PROTO(struct snd_sof_widget *swidget),
+	TP_ARGS(swidget)
+);
+
+DEFINE_EVENT(sof_widget_template, sof_widget_free,
+	TP_PROTO(struct snd_sof_widget *swidget),
+	TP_ARGS(swidget)
+);
+
+#endif /* _TRACE_SOF_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

sound/soc/sof/core.c

@@ -15,6 +15,9 @@
 #include "sof-priv.h"
 #include "ops.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/sof.h>
+
 /* see SOF_DBG_ flags */
 static int sof_core_debug =  IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_FIRMWARE_TRACE);
 module_param_named(sof_debug, sof_core_debug, int, 0444);

sound/soc/sof/sof-audio.c

@@ -9,6 +9,7 @@
 //
 
 #include <linux/bitfield.h>
+#include <trace/events/sof.h>
 #include "sof-audio.h"
 #include "sof-of-dev.h"
 #include "ops.h"
@@ -36,6 +37,8 @@ int sof_widget_free(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
 	if (!swidget->private)
 		return 0;
 
+	trace_sof_widget_free(swidget);
+
 	/* only free when use_count is 0 */
 	if (--swidget->use_count)
 		return 0;
@@ -86,6 +89,8 @@ int sof_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
 	if (!swidget->private)
 		return 0;
 
+	trace_sof_widget_setup(swidget);
+
 	/* widget already set up */
 	if (++swidget->use_count > 1)
 		return 0;