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: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
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64
include/trace/events/asoc.h
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64
include/trace/events/asoc.h
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM asoc
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#if !defined(_TRACE_ASOC_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_ASOC_H
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#include <linux/ktime.h>
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#include <linux/tracepoint.h>
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struct snd_soc_codec;
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/*
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* Log register events
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*/
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DECLARE_EVENT_CLASS(snd_soc_reg,
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TP_PROTO(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int val),
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TP_ARGS(codec, reg, val),
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TP_STRUCT__entry(
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__string( name, codec->name )
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__field( int, id )
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__field( unsigned int, reg )
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__field( unsigned int, val )
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),
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TP_fast_assign(
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__assign_str(name, codec->name);
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__entry->id = codec->id;
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__entry->reg = reg;
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__entry->val = val;
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),
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TP_printk("codec=%s.%d reg=%x val=%x", __get_str(name),
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(int)__entry->id, (unsigned int)__entry->reg,
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(unsigned int)__entry->val)
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);
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DEFINE_EVENT(snd_soc_reg, snd_soc_reg_write,
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TP_PROTO(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int val),
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TP_ARGS(codec, reg, val)
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);
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DEFINE_EVENT(snd_soc_reg, snd_soc_reg_read,
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TP_PROTO(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int val),
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TP_ARGS(codec, reg, val)
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);
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#endif /* _TRACE_ASOC_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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@ -39,6 +39,9 @@
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#include <sound/soc-dapm.h>
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#include <sound/initval.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/asoc.h>
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#define NAME_SIZE 32
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static DEFINE_MUTEX(pcm_mutex);
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@ -1914,6 +1917,7 @@ unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg)
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ret = codec->driver->read(codec, reg);
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dev_dbg(codec->dev, "read %x => %x\n", reg, ret);
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trace_snd_soc_reg_read(codec, reg, ret);
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return ret;
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}
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@ -1923,6 +1927,7 @@ unsigned int snd_soc_write(struct snd_soc_codec *codec,
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unsigned int reg, unsigned int val)
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{
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dev_dbg(codec->dev, "write %x = %x\n", reg, val);
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trace_snd_soc_reg_write(codec, reg, val);
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return codec->driver->write(codec, reg, val);
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}
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EXPORT_SYMBOL_GPL(snd_soc_write);
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