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Commit a8b1d34f authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Add trace events for ASoC register read/write 



The trace subsystem provides a convenient way of instrumenting the kernel
which can be left on all the time with extremely low impact on the system
unlike prints to the kernel log which can be very spammy. Begin adding
support for instrumenting ASoC via this interface by adding trace for the
register access primitives.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent 68f89ad8

include/trace/events/asoc.h

0 → 100644
+64 −0
Original line number Diff line number Diff line 
#undef TRACE_SYSTEM

#define TRACE_SYSTEM asoc



#if !defined(_TRACE_ASOC_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_ASOC_H



#include <linux/ktime.h>

#include <linux/tracepoint.h>



struct snd_soc_codec;



/*

 * Log register events

 */

DECLARE_EVENT_CLASS(snd_soc_reg,



	TP_PROTO(struct snd_soc_codec *codec, unsigned int reg,

		 unsigned int val),



	TP_ARGS(codec, reg, val),



	TP_STRUCT__entry(

		__string(	name,		codec->name	)

		__field(	int,		id		)

		__field(	unsigned int,	reg		)

		__field(	unsigned int,	val		)

	),



	TP_fast_assign(

		__assign_str(name, codec->name);

		__entry->id = codec->id;

		__entry->reg = reg;

		__entry->val = val;

	),



	TP_printk("codec=%s.%d reg=%x val=%x", __get_str(name),

		  (int)__entry->id, (unsigned int)__entry->reg,

		  (unsigned int)__entry->val)

);



DEFINE_EVENT(snd_soc_reg, snd_soc_reg_write,



	TP_PROTO(struct snd_soc_codec *codec, unsigned int reg,

		 unsigned int val),



	TP_ARGS(codec, reg, val)



);



DEFINE_EVENT(snd_soc_reg, snd_soc_reg_read,



	TP_PROTO(struct snd_soc_codec *codec, unsigned int reg,

		 unsigned int val),



	TP_ARGS(codec, reg, val)



);







#endif /* _TRACE_ASOC_H */



/* This part must be outside protection */

#include <trace/define_trace.h>

sound/soc/soc-core.c

+5 −0
Original line number Diff line number Diff line
@@ -39,6 +39,9 @@ 
#include <sound/soc-dapm.h>

#include <sound/initval.h>



#define CREATE_TRACE_POINTS

#include <trace/events/asoc.h>



#define NAME_SIZE	32



static DEFINE_MUTEX(pcm_mutex);
@@ -1914,6 +1917,7 @@ unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg) 


	ret = codec->driver->read(codec, reg);

	dev_dbg(codec->dev, "read %x => %x\n", reg, ret);

	trace_snd_soc_reg_read(codec, reg, ret);



	return ret;

}
@@ -1923,6 +1927,7 @@ unsigned int snd_soc_write(struct snd_soc_codec *codec, 
			   unsigned int reg, unsigned int val)

{

	dev_dbg(codec->dev, "write %x = %x\n", reg, val);

	trace_snd_soc_reg_write(codec, reg, val);

	return codec->driver->write(codec, reg, val);

}

EXPORT_SYMBOL_GPL(snd_soc_write);