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From: Luca Ceresoli <luca.ceresoli@bootlin.com>
Date: Wed, 06 Mar 2024 10:30:00 +0100
Subject: [PATCH 1/2] ASoC: trace: add component to set_bias_level trace
 events
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Message-Id: <20240306-improve-asoc-trace-events-v1-1-edb252bbeb10@bootlin.com>
References: <20240306-improve-asoc-trace-events-v1-0-edb252bbeb10@bootlin.com>
In-Reply-To: <20240306-improve-asoc-trace-events-v1-0-edb252bbeb10@bootlin.com>
To: Steven Rostedt <rostedt@goodmis.org>, 
 Masami Hiramatsu <mhiramat@kernel.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, 
 Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, 
 Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>, 
 linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, 
 linux-sound@vger.kernel.org, Luca Ceresoli <luca.ceresoli@bootlin.com>

The snd_soc_bias_level_start and snd_soc_bias_level_done trace events
currently look like:

           aplay-229   [000]  1250.140778: snd_soc_bias_level_start: card=vscn-2046 val=1
           aplay-229   [000]  1250.140784: snd_soc_bias_level_done: card=vscn-2046 val=1
           aplay-229   [000]  1250.140786: snd_soc_bias_level_start: card=vscn-2046 val=2
           aplay-229   [000]  1250.140788: snd_soc_bias_level_done: card=vscn-2046 val=2
    kworker/u8:1-21    [000]  1250.140871: snd_soc_bias_level_start: card=vscn-2046 val=1
    kworker/u8:0-11    [000]  1250.140951: snd_soc_bias_level_start: card=vscn-2046 val=1
    kworker/u8:0-11    [000]  1250.140956: snd_soc_bias_level_done: card=vscn-2046 val=1
    kworker/u8:0-11    [000]  1250.140959: snd_soc_bias_level_start: card=vscn-2046 val=2
    kworker/u8:0-11    [000]  1250.140961: snd_soc_bias_level_done: card=vscn-2046 val=2
    kworker/u8:1-21    [000]  1250.167219: snd_soc_bias_level_done: card=vscn-2046 val=1
    kworker/u8:1-21    [000]  1250.167222: snd_soc_bias_level_start: card=vscn-2046 val=2
    kworker/u8:1-21    [000]  1250.167232: snd_soc_bias_level_done: card=vscn-2046 val=2
    kworker/u8:0-11    [000]  1250.167440: snd_soc_bias_level_start: card=vscn-2046 val=3
    kworker/u8:0-11    [000]  1250.167444: snd_soc_bias_level_done: card=vscn-2046 val=3
    kworker/u8:1-21    [000]  1250.167497: snd_soc_bias_level_start: card=vscn-2046 val=3
    kworker/u8:1-21    [000]  1250.167506: snd_soc_bias_level_done: card=vscn-2046 val=3

There are clearly multiple calls, one per component, but they cannot be
discriminated from each other.

Change the ftrace events to also print the component name, to make it clear
which part of the code is involved. This requires changing the passed value
from a struct snd_soc_card, where the DAPM context is not kwown, to a
struct snd_soc_dapm_context where it is obviously known but the a card
pointer is also available.

With this change, the resulting trace becomes:

           aplay-247   [000]  1436.357332: snd_soc_bias_level_start: card=vscn-2046 component=(none) val=1
           aplay-247   [000]  1436.357338: snd_soc_bias_level_done: card=vscn-2046 component=(none) val=1
           aplay-247   [000]  1436.357340: snd_soc_bias_level_start: card=vscn-2046 component=(none) val=2
           aplay-247   [000]  1436.357343: snd_soc_bias_level_done: card=vscn-2046 component=(none) val=2
    kworker/u8:4-215   [000]  1436.357437: snd_soc_bias_level_start: card=vscn-2046 component=ff560000.codec val=1
    kworker/u8:5-231   [000]  1436.357518: snd_soc_bias_level_start: card=vscn-2046 component=ff320000.i2s val=1
    kworker/u8:5-231   [000]  1436.357523: snd_soc_bias_level_done: card=vscn-2046 component=ff320000.i2s val=1
    kworker/u8:5-231   [000]  1436.357526: snd_soc_bias_level_start: card=vscn-2046 component=ff320000.i2s val=2
    kworker/u8:5-231   [000]  1436.357528: snd_soc_bias_level_done: card=vscn-2046 component=ff320000.i2s val=2
    kworker/u8:4-215   [000]  1436.383217: snd_soc_bias_level_done: card=vscn-2046 component=ff560000.codec val=1
    kworker/u8:4-215   [000]  1436.383221: snd_soc_bias_level_start: card=vscn-2046 component=ff560000.codec val=2
    kworker/u8:4-215   [000]  1436.383231: snd_soc_bias_level_done: card=vscn-2046 component=ff560000.codec val=2
    kworker/u8:5-231   [000]  1436.383468: snd_soc_bias_level_start: card=vscn-2046 component=ff320000.i2s val=3
    kworker/u8:5-231   [000]  1436.383472: snd_soc_bias_level_done: card=vscn-2046 component=ff320000.i2s val=3
    kworker/u8:4-215   [000]  1436.383503: snd_soc_bias_level_start: card=vscn-2046 component=ff560000.codec val=3
    kworker/u8:4-215   [000]  1436.383513: snd_soc_bias_level_done: card=vscn-2046 component=ff560000.codec val=3

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 include/trace/events/asoc.h | 29 ++++++++++++++++-------------
 sound/soc/soc-dapm.c        |  4 ++--
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/include/trace/events/asoc.h b/include/trace/events/asoc.h
index 4d8ef71090af..b7ac7f100bb4 100644
--- a/include/trace/events/asoc.h
+++ b/include/trace/events/asoc.h
@@ -17,38 +17,41 @@ struct snd_soc_card;
 struct snd_soc_dapm_widget;
 struct snd_soc_dapm_path;
 
-DECLARE_EVENT_CLASS(snd_soc_card,
+DECLARE_EVENT_CLASS(snd_soc_dapm,
 
-	TP_PROTO(struct snd_soc_card *card, int val),
+	TP_PROTO(struct snd_soc_dapm_context *dapm, int val),
 
-	TP_ARGS(card, val),
+	TP_ARGS(dapm, val),
 
 	TP_STRUCT__entry(
-		__string(	name,		card->name	)
-		__field(	int,		val		)
+		__string(	card_name,	dapm->card->name)
+		__string(	comp_name,	dapm->component ? dapm->component->name : "(none)")
+		__field(	int,		val)
 	),
 
 	TP_fast_assign(
-		__assign_str(name, card->name);
+		__assign_str(card_name, dapm->card->name);
+		__assign_str(comp_name, dapm->component ? dapm->component->name : "(none)");
 		__entry->val = val;
 	),
 
-	TP_printk("card=%s val=%d", __get_str(name), (int)__entry->val)
+	TP_printk("card=%s component=%s val=%d",
+		  __get_str(card_name), __get_str(comp_name), (int)__entry->val)
 );
 
-DEFINE_EVENT(snd_soc_card, snd_soc_bias_level_start,
+DEFINE_EVENT(snd_soc_dapm, snd_soc_bias_level_start,
 
-	TP_PROTO(struct snd_soc_card *card, int val),
+	TP_PROTO(struct snd_soc_dapm_context *dapm, int val),
 
-	TP_ARGS(card, val)
+	TP_ARGS(dapm, val)
 
 );
 
-DEFINE_EVENT(snd_soc_card, snd_soc_bias_level_done,
+DEFINE_EVENT(snd_soc_dapm, snd_soc_bias_level_done,
 
-	TP_PROTO(struct snd_soc_card *card, int val),
+	TP_PROTO(struct snd_soc_dapm_context *dapm, int val),
 
-	TP_ARGS(card, val)
+	TP_ARGS(dapm, val)
 
 );
 
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index bffeea80277f..7e8a2a5312f5 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -725,7 +725,7 @@ static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
 	struct snd_soc_card *card = dapm->card;
 	int ret = 0;
 
-	trace_snd_soc_bias_level_start(card, level);
+	trace_snd_soc_bias_level_start(dapm, level);
 
 	ret = snd_soc_card_set_bias_level(card, dapm, level);
 	if (ret != 0)
@@ -739,7 +739,7 @@ static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
 
 	ret = snd_soc_card_set_bias_level_post(card, dapm, level);
 out:
-	trace_snd_soc_bias_level_done(card, level);
+	trace_snd_soc_bias_level_done(dapm, level);
 
 	return ret;
 }

-- 
2.34.1