[deliverable/linux.git] / kernel / trace / trace_power.c

/*
 * ring buffer based C-state tracer
 *
 * Arjan van de Ven <arjan@linux.intel.com>
 * Copyright (C) 2008 Intel Corporation
 *
 * Much is borrowed from trace_boot.c which is
 * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
 *
 */

#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/kallsyms.h>
#include <linux/module.h>

#include "trace.h"
#include "trace_output.h"

static struct trace_array *power_trace;
static int __read_mostly trace_power_enabled;


static void start_power_trace(struct trace_array *tr)
{
	trace_power_enabled = 1;
}

static void stop_power_trace(struct trace_array *tr)
{
	trace_power_enabled = 0;
}


static int power_trace_init(struct trace_array *tr)
{
	int cpu;
	power_trace = tr;

	trace_power_enabled = 1;

	for_each_cpu(cpu, cpu_possible_mask)
		tracing_reset(tr, cpu);
	return 0;
}

static enum print_line_t power_print_line(struct trace_iterator *iter)
{
	int ret = 0;
	struct trace_entry *entry = iter->ent;
	struct trace_power *field ;
	struct power_trace *it;
	struct trace_seq *s = &iter->seq;
	struct timespec stamp;
	struct timespec duration;

	trace_assign_type(field, entry);
	it = &field->state_data;
	stamp = ktime_to_timespec(it->stamp);
	duration = ktime_to_timespec(ktime_sub(it->end, it->stamp));

	if (entry->type == TRACE_POWER) {
		if (it->type == POWER_CSTATE)
			ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n",
					  stamp.tv_sec,
					  stamp.tv_nsec,
					  it->state, iter->cpu,
					  duration.tv_sec,
					  duration.tv_nsec);
		if (it->type == POWER_PSTATE)
			ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n",
					  stamp.tv_sec,
					  stamp.tv_nsec,
					  it->state, iter->cpu);
		if (!ret)
			return TRACE_TYPE_PARTIAL_LINE;
		return TRACE_TYPE_HANDLED;
	}
	return TRACE_TYPE_UNHANDLED;
}

static struct tracer power_tracer __read_mostly =
{
	.name		= "power",
	.init		= power_trace_init,
	.start		= start_power_trace,
	.stop		= stop_power_trace,
	.reset		= stop_power_trace,
	.print_line	= power_print_line,
};

static int init_power_trace(void)
{
	return register_tracer(&power_tracer);
}
device_initcall(init_power_trace);

void trace_power_start(struct power_trace *it, unsigned int type,
			 unsigned int level)
{
	if (!trace_power_enabled)
		return;

	memset(it, 0, sizeof(struct power_trace));
	it->state = level;
	it->type = type;
	it->stamp = ktime_get();
}
EXPORT_SYMBOL_GPL(trace_power_start);


void trace_power_end(struct power_trace *it)
{
	struct ring_buffer_event *event;
	struct trace_power *entry;
	struct trace_array_cpu *data;
	struct trace_array *tr = power_trace;

	if (!trace_power_enabled)
		return;

	preempt_disable();
	it->end = ktime_get();
	data = tr->data[smp_processor_id()];

	event = trace_buffer_lock_reserve(tr, TRACE_POWER,
					  sizeof(*entry), 0, 0);
	if (!event)
		goto out;
	entry	= ring_buffer_event_data(event);
	entry->state_data = *it;
	trace_buffer_unlock_commit(tr, event, 0, 0);
 out:
	preempt_enable();
}
EXPORT_SYMBOL_GPL(trace_power_end);

void trace_power_mark(struct power_trace *it, unsigned int type,
			 unsigned int level)
{
	struct ring_buffer_event *event;
	struct trace_power *entry;
	struct trace_array_cpu *data;
	struct trace_array *tr = power_trace;

	if (!trace_power_enabled)
		return;

	memset(it, 0, sizeof(struct power_trace));
	it->state = level;
	it->type = type;
	it->stamp = ktime_get();
	preempt_disable();
	it->end = it->stamp;
	data = tr->data[smp_processor_id()];

	event = trace_buffer_lock_reserve(tr, TRACE_POWER,
					  sizeof(*entry), 0, 0);
	if (!event)
		goto out;
	entry	= ring_buffer_event_data(event);
	entry->state_data = *it;
	trace_buffer_unlock_commit(tr, event, 0, 0);
 out:
	preempt_enable();
}
EXPORT_SYMBOL_GPL(trace_power_mark);
Commit	Line	Data
f3f47a67 AV	1	/*
	2	* ring buffer based C-state tracer
	3	*
	4	* Arjan van de Ven <arjan@linux.intel.com>
	5	* Copyright (C) 2008 Intel Corporation
	6	*
	7	* Much is borrowed from trace_boot.c which is
	8	* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
	9	*
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/debugfs.h>
	14	#include <linux/ftrace.h>
	15	#include <linux/kallsyms.h>
	16	#include <linux/module.h>
	17
	18	#include "trace.h"
f0868d1e	19	#include "trace_output.h"
f3f47a67 AV	20
	21	static struct trace_array *power_trace;
	22	static int __read_mostly trace_power_enabled;
	23
	24
	25	static void start_power_trace(struct trace_array *tr)
	26	{
	27	trace_power_enabled = 1;
	28	}
	29
	30	static void stop_power_trace(struct trace_array *tr)
	31	{
	32	trace_power_enabled = 0;
	33	}
	34
	35
	36	static int power_trace_init(struct trace_array *tr)
	37	{
	38	int cpu;
	39	power_trace = tr;
	40
	41	trace_power_enabled = 1;
	42
4462344e	43	for_each_cpu(cpu, cpu_possible_mask)
f3f47a67 AV	44	tracing_reset(tr, cpu);
	45	return 0;
	46	}
	47
	48	static enum print_line_t power_print_line(struct trace_iterator *iter)
	49	{
	50	int ret = 0;
	51	struct trace_entry *entry = iter->ent;
	52	struct trace_power *field ;
	53	struct power_trace *it;
	54	struct trace_seq *s = &iter->seq;
	55	struct timespec stamp;
	56	struct timespec duration;
	57
	58	trace_assign_type(field, entry);
	59	it = &field->state_data;
	60	stamp = ktime_to_timespec(it->stamp);
	61	duration = ktime_to_timespec(ktime_sub(it->end, it->stamp));
	62
	63	if (entry->type == TRACE_POWER) {
	64	if (it->type == POWER_CSTATE)
	65	ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n",
	66	stamp.tv_sec,
	67	stamp.tv_nsec,
	68	it->state, iter->cpu,
	69	duration.tv_sec,
	70	duration.tv_nsec);
	71	if (it->type == POWER_PSTATE)
	72	ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n",
	73	stamp.tv_sec,
	74	stamp.tv_nsec,
	75	it->state, iter->cpu);
	76	if (!ret)
	77	return TRACE_TYPE_PARTIAL_LINE;
	78	return TRACE_TYPE_HANDLED;
	79	}
	80	return TRACE_TYPE_UNHANDLED;
	81	}
	82
	83	static struct tracer power_tracer __read_mostly =
	84	{
	85	.name = "power",
	86	.init = power_trace_init,
	87	.start = start_power_trace,
	88	.stop = stop_power_trace,
	89	.reset = stop_power_trace,
	90	.print_line = power_print_line,
	91	};
	92
	93	static int init_power_trace(void)
	94	{
	95	return register_tracer(&power_tracer);
	96	}
	97	device_initcall(init_power_trace);
	98
	99	void trace_power_start(struct power_trace *it, unsigned int type,
	100	unsigned int level)
	101	{
	102	if (!trace_power_enabled)
	103	return;
	104
	105	memset(it, 0, sizeof(struct power_trace));
	106	it->state = level;
	107	it->type = type;
108	it->stamp = ktime_get();
109	}
110	EXPORT_SYMBOL_GPL(trace_power_start);
111
112
113	void trace_power_end(struct power_trace *it)
114	{
115	struct ring_buffer_event *event;
116	struct trace_power *entry;
117	struct trace_array_cpu *data;
f3f47a67 AV	118	struct trace_array *tr = power_trace;
	119
	120	if (!trace_power_enabled)
	121	return;
	122
	123	preempt_disable();
	124	it->end = ktime_get();
	125	data = tr->data[smp_processor_id()];
	126
51a763dd ACM	127	event = trace_buffer_lock_reserve(tr, TRACE_POWER,
51a763dd ACM	128	sizeof(*entry), 0, 0);
f3f47a67 AV	129	if (!event)
	130	goto out;
	131	entry = ring_buffer_event_data(event);
f3f47a67	132	entry->state_data = *it;
51a763dd	133	trace_buffer_unlock_commit(tr, event, 0, 0);
f3f47a67 AV	134	out:
	135	preempt_enable();
	136	}
	137	EXPORT_SYMBOL_GPL(trace_power_end);
	138
	139	void trace_power_mark(struct power_trace *it, unsigned int type,
	140	unsigned int level)
	141	{
	142	struct ring_buffer_event *event;
	143	struct trace_power *entry;
	144	struct trace_array_cpu *data;
f3f47a67 AV	145	struct trace_array *tr = power_trace;
	146
	147	if (!trace_power_enabled)
	148	return;
	149
	150	memset(it, 0, sizeof(struct power_trace));
	151	it->state = level;
	152	it->type = type;
	153	it->stamp = ktime_get();
	154	preempt_disable();
	155	it->end = it->stamp;
	156	data = tr->data[smp_processor_id()];
	157
51a763dd ACM	158	event = trace_buffer_lock_reserve(tr, TRACE_POWER,
51a763dd ACM	159	sizeof(*entry), 0, 0);
f3f47a67 AV	160	if (!event)
	161	goto out;
	162	entry = ring_buffer_event_data(event);
f3f47a67	163	entry->state_data = *it;
51a763dd	164	trace_buffer_unlock_commit(tr, event, 0, 0);
f3f47a67 AV	165	out:
	166	preempt_enable();
	167	}
	168	EXPORT_SYMBOL_GPL(trace_power_mark);