ASoC: trace: add component to set_bias_level trace events

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>
Link: https://msgid.link/r/20240306-improve-asoc-trace-events-v1-1-edb252bbeb10@bootlin.comSigned-off-by: Mark Brown <broonie@kernel.org>

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)
 
 );
 

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;
 }