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PM / Runtime: Introduce trace points for tracing rpm_* functions 

This patch introduces 3 trace points to prepare for tracing
rpm_idle/rpm_suspend/rpm_resume functions, so we can use these
trace points to replace the current dev_dbg().

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Ming Lei 2011-09-27 22:53:27 +02:00 committed by Rafael J. Wysocki
parent ad3c36a534
commit 53b615ccca
3 changed files with 120 additions and 0 deletions
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99
include/trace/events/rpm.h Normal file
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@ -0,0 +1,99 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM rpm
#if !defined(_TRACE_RUNTIME_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_RUNTIME_POWER_H
#include <linux/ktime.h>
#include <linux/tracepoint.h>
#include <linux/device.h>
/*
* The rpm_internal events are used for tracing some important
* runtime pm internal functions.
*/
DECLARE_EVENT_CLASS(rpm_internal,
TP_PROTO(struct device *dev, int flags),
TP_ARGS(dev, flags),
TP_STRUCT__entry(
__string( name, dev_name(dev) )
__field( int, flags )
__field( int , usage_count )
__field( int , disable_depth )
__field( int , runtime_auto )
__field( int , request_pending )
__field( int , irq_safe )
__field( int , child_count )
),
TP_fast_assign(
__assign_str(name, dev_name(dev));
__entry->flags = flags;
__entry->usage_count = atomic_read(
&dev->power.usage_count);
__entry->disable_depth = dev->power.disable_depth;
__entry->runtime_auto = dev->power.runtime_auto;
__entry->request_pending = dev->power.request_pending;
__entry->irq_safe = dev->power.irq_safe;
__entry->child_count = atomic_read(
&dev->power.child_count);
),
TP_printk("%s flags-%x cnt-%-2d dep-%-2d auto-%-1d p-%-1d"
" irq-%-1d child-%d",
__get_str(name), __entry->flags,
__entry->usage_count,
__entry->disable_depth,
__entry->runtime_auto,
__entry->request_pending,
__entry->irq_safe,
__entry->child_count
)
);
DEFINE_EVENT(rpm_internal, rpm_suspend,
TP_PROTO(struct device *dev, int flags),
TP_ARGS(dev, flags)
);
DEFINE_EVENT(rpm_internal, rpm_resume,
TP_PROTO(struct device *dev, int flags),
TP_ARGS(dev, flags)
);
DEFINE_EVENT(rpm_internal, rpm_idle,
TP_PROTO(struct device *dev, int flags),
TP_ARGS(dev, flags)
);
TRACE_EVENT(rpm_return_int,
TP_PROTO(struct device *dev, unsigned long ip, int ret),
TP_ARGS(dev, ip, ret),
TP_STRUCT__entry(
__string( name, dev_name(dev))
__field( unsigned long, ip )
__field( int, ret )
),
TP_fast_assign(
__assign_str(name, dev_name(dev));
__entry->ip = ip;
__entry->ret = ret;
),
TP_printk("%pS:%s ret=%d", (void *)__entry->ip, __get_str(name),
__entry->ret)
);
#endif /* _TRACE_RUNTIME_POWER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

1
kernel/trace/Makefile
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@ -53,6 +53,7 @@ endif
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
obj-$(CONFIG_TRACEPOINTS) += power-traces.o
obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
ifeq ($(CONFIG_TRACING),y)
obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
endif

20
kernel/trace/rpm-traces.c Normal file
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@ -0,0 +1,20 @@
/*
* Power trace points
*
* Copyright (C) 2009 Ming Lei <ming.lei@canonical.com>
*/
#include <linux/string.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/usb.h>
#define CREATE_TRACE_POINTS
#include <trace/events/rpm.h>
EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_return_int);
EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_idle);
EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_suspend);
EXPORT_TRACEPOINT_SYMBOL_GPL(rpm_resume);