1/*
  2 * trace task wakeup timings
  3 *
  4 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
  5 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
  6 *
  7 * Based on code from the latency_tracer, that is:
  8 *
  9 *  Copyright (C) 2004-2006 Ingo Molnar
 10 *  Copyright (C) 2004 Nadia Yvette Chambers
 11 */
 12#include <linux/module.h>
 
 
 13#include <linux/kallsyms.h>
 14#include <linux/uaccess.h>
 15#include <linux/ftrace.h>
 16#include <linux/sched/rt.h>
 17#include <linux/sched/deadline.h>
 18#include <trace/events/sched.h>
 
 19#include "trace.h"
 20
 21static struct trace_array	*wakeup_trace;
 22static int __read_mostly	tracer_enabled;
 23
 24static struct task_struct	*wakeup_task;
 25static int			wakeup_cpu;
 26static int			wakeup_current_cpu;
 27static unsigned			wakeup_prio = -1;
 28static int			wakeup_rt;
 29static int			wakeup_dl;
 30static int			tracing_dl = 0;
 31
 32static arch_spinlock_t wakeup_lock =
 33	(arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
 34
 35static void wakeup_reset(struct trace_array *tr);
 36static void __wakeup_reset(struct trace_array *tr);
 
 
 37
 38static int save_flags;
 39
 
 
 
 40#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 41static int wakeup_display_graph(struct trace_array *tr, int set);
 42# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
 43#else
 44static inline int wakeup_display_graph(struct trace_array *tr, int set)
 45{
 46	return 0;
 47}
 48# define is_graph(tr) false
 49#endif
 
 
 50
 
 
 
 
 51
 52#ifdef CONFIG_FUNCTION_TRACER
 53
 54static int wakeup_graph_entry(struct ftrace_graph_ent *trace);
 55static void wakeup_graph_return(struct ftrace_graph_ret *trace);
 56
 57static bool function_enabled;
 58
 59/*
 60 * Prologue for the wakeup function tracers.
 61 *
 62 * Returns 1 if it is OK to continue, and preemption
 63 *            is disabled and data->disabled is incremented.
 64 *         0 if the trace is to be ignored, and preemption
 65 *            is not disabled and data->disabled is
 66 *            kept the same.
 67 *
 68 * Note, this function is also used outside this ifdef but
 69 *  inside the #ifdef of the function graph tracer below.
 70 *  This is OK, since the function graph tracer is
 71 *  dependent on the function tracer.
 72 */
 73static int
 74func_prolog_preempt_disable(struct trace_array *tr,
 75			    struct trace_array_cpu **data,
 76			    int *pc)
 77{
 78	long disabled;
 79	int cpu;
 80
 81	if (likely(!wakeup_task))
 82		return 0;
 83
 84	*pc = preempt_count();
 85	preempt_disable_notrace();
 86
 87	cpu = raw_smp_processor_id();
 88	if (cpu != wakeup_current_cpu)
 89		goto out_enable;
 90
 91	*data = per_cpu_ptr(tr->trace_buffer.data, cpu);
 92	disabled = atomic_inc_return(&(*data)->disabled);
 93	if (unlikely(disabled != 1))
 94		goto out;
 95
 96	return 1;
 97
 98out:
 99	atomic_dec(&(*data)->disabled);
100
101out_enable:
102	preempt_enable_notrace();
103	return 0;
104}
105
106/*
107 * wakeup uses its own tracer function to keep the overhead down:
108 */
109static void
110wakeup_tracer_call(unsigned long ip, unsigned long parent_ip,
111		   struct ftrace_ops *op, struct pt_regs *pt_regs)
112{
113	struct trace_array *tr = wakeup_trace;
114	struct trace_array_cpu *data;
115	unsigned long flags;
116	int pc;
117
118	if (!func_prolog_preempt_disable(tr, &data, &pc))
119		return;
120
121	local_irq_save(flags);
122	trace_function(tr, ip, parent_ip, flags, pc);
123	local_irq_restore(flags);
124
125	atomic_dec(&data->disabled);
126	preempt_enable_notrace();
127}
128
129static int register_wakeup_function(struct trace_array *tr, int graph, int set)
130{
131	int ret;
132
133	/* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
134	if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
135		return 0;
136
137	if (graph)
138		ret = register_ftrace_graph(&wakeup_graph_return,
139					    &wakeup_graph_entry);
140	else
141		ret = register_ftrace_function(tr->ops);
142
143	if (!ret)
144		function_enabled = true;
145
146	return ret;
147}
148
149static void unregister_wakeup_function(struct trace_array *tr, int graph)
150{
151	if (!function_enabled)
152		return;
153
154	if (graph)
155		unregister_ftrace_graph();
156	else
157		unregister_ftrace_function(tr->ops);
158
159	function_enabled = false;
160}
161
162static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
163{
164	if (!(mask & TRACE_ITER_FUNCTION))
165		return 0;
166
167	if (set)
168		register_wakeup_function(tr, is_graph(tr), 1);
169	else
170		unregister_wakeup_function(tr, is_graph(tr));
171	return 1;
172}
173#else
174static int register_wakeup_function(struct trace_array *tr, int graph, int set)
175{
176	return 0;
177}
178static void unregister_wakeup_function(struct trace_array *tr, int graph) { }
179static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
180{
181	return 0;
182}
183#endif /* CONFIG_FUNCTION_TRACER */
184
185static int wakeup_flag_changed(struct trace_array *tr, u32 mask, int set)
186{
187	struct tracer *tracer = tr->current_trace;
188
189	if (wakeup_function_set(tr, mask, set))
190		return 0;
191
192#ifdef CONFIG_FUNCTION_GRAPH_TRACER
193	if (mask & TRACE_ITER_DISPLAY_GRAPH)
194		return wakeup_display_graph(tr, set);
195#endif
196
197	return trace_keep_overwrite(tracer, mask, set);
198}
199
200static int start_func_tracer(struct trace_array *tr, int graph)
201{
202	int ret;
203
204	ret = register_wakeup_function(tr, graph, 0);
 
 
 
 
205
206	if (!ret && tracing_is_enabled())
207		tracer_enabled = 1;
208	else
209		tracer_enabled = 0;
210
211	return ret;
212}
213
214static void stop_func_tracer(struct trace_array *tr, int graph)
215{
216	tracer_enabled = 0;
217
218	unregister_wakeup_function(tr, graph);
 
 
 
219}
220
221#ifdef CONFIG_FUNCTION_GRAPH_TRACER
222static int wakeup_display_graph(struct trace_array *tr, int set)
223{
224	if (!(is_graph(tr) ^ set))
 
 
 
 
225		return 0;
226
227	stop_func_tracer(tr, !set);
228
229	wakeup_reset(wakeup_trace);
230	tr->max_latency = 0;
231
232	return start_func_tracer(tr, set);
233}
234
235static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
236{
237	struct trace_array *tr = wakeup_trace;
238	struct trace_array_cpu *data;
239	unsigned long flags;
240	int pc, ret = 0;
241
242	if (ftrace_graph_ignore_func(trace))
243		return 0;
244	/*
245	 * Do not trace a function if it's filtered by set_graph_notrace.
246	 * Make the index of ret stack negative to indicate that it should
247	 * ignore further functions.  But it needs its own ret stack entry
248	 * to recover the original index in order to continue tracing after
249	 * returning from the function.
250	 */
251	if (ftrace_graph_notrace_addr(trace->func))
252		return 1;
253
254	if (!func_prolog_preempt_disable(tr, &data, &pc))
255		return 0;
256
257	local_save_flags(flags);
258	ret = __trace_graph_entry(tr, trace, flags, pc);
259	atomic_dec(&data->disabled);
260	preempt_enable_notrace();
261
262	return ret;
263}
264
265static void wakeup_graph_return(struct ftrace_graph_ret *trace)
266{
267	struct trace_array *tr = wakeup_trace;
268	struct trace_array_cpu *data;
269	unsigned long flags;
270	int pc;
271
272	if (!func_prolog_preempt_disable(tr, &data, &pc))
273		return;
274
275	local_save_flags(flags);
276	__trace_graph_return(tr, trace, flags, pc);
277	atomic_dec(&data->disabled);
278
279	preempt_enable_notrace();
280	return;
281}
282
283static void wakeup_trace_open(struct trace_iterator *iter)
284{
285	if (is_graph(iter->tr))
286		graph_trace_open(iter);
287}
288
289static void wakeup_trace_close(struct trace_iterator *iter)
290{
291	if (iter->private)
292		graph_trace_close(iter);
293}
294
295#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \
296			    TRACE_GRAPH_PRINT_ABS_TIME | \
297			    TRACE_GRAPH_PRINT_DURATION)
298
299static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
300{
301	/*
302	 * In graph mode call the graph tracer output function,
303	 * otherwise go with the TRACE_FN event handler
304	 */
305	if (is_graph(iter->tr))
306		return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
307
308	return TRACE_TYPE_UNHANDLED;
309}
310
311static void wakeup_print_header(struct seq_file *s)
312{
313	if (is_graph(wakeup_trace))
314		print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
315	else
316		trace_default_header(s);
317}
318
319static void
320__trace_function(struct trace_array *tr,
321		 unsigned long ip, unsigned long parent_ip,
322		 unsigned long flags, int pc)
323{
324	if (is_graph(tr))
325		trace_graph_function(tr, ip, parent_ip, flags, pc);
326	else
327		trace_function(tr, ip, parent_ip, flags, pc);
328}
329#else
330#define __trace_function trace_function
331
332static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
333{
334	return TRACE_TYPE_UNHANDLED;
335}
336
337static void wakeup_trace_open(struct trace_iterator *iter) { }
338static void wakeup_trace_close(struct trace_iterator *iter) { }
339
340#ifdef CONFIG_FUNCTION_TRACER
341static int wakeup_graph_entry(struct ftrace_graph_ent *trace)
342{
343	return -1;
344}
345static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }
346static void wakeup_print_header(struct seq_file *s)
347{
348	trace_default_header(s);
349}
350#else
351static void wakeup_print_header(struct seq_file *s)
352{
353	trace_latency_header(s);
354}
355#endif /* CONFIG_FUNCTION_TRACER */
 
 
 
 
356#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
357
358/*
359 * Should this new latency be reported/recorded?
360 */
361static bool report_latency(struct trace_array *tr, u64 delta)
362{
363	if (tracing_thresh) {
364		if (delta < tracing_thresh)
365			return false;
366	} else {
367		if (delta <= tr->max_latency)
368			return false;
369	}
370	return true;
371}
372
373static void
374probe_wakeup_migrate_task(void *ignore, struct task_struct *task, int cpu)
375{
376	if (task != wakeup_task)
377		return;
378
379	wakeup_current_cpu = cpu;
380}
381
382static void
383tracing_sched_switch_trace(struct trace_array *tr,
384			   struct task_struct *prev,
385			   struct task_struct *next,
386			   unsigned long flags, int pc)
387{
388	struct trace_event_call *call = &event_context_switch;
389	struct ring_buffer *buffer = tr->trace_buffer.buffer;
390	struct ring_buffer_event *event;
391	struct ctx_switch_entry *entry;
392
393	event = trace_buffer_lock_reserve(buffer, TRACE_CTX,
394					  sizeof(*entry), flags, pc);
395	if (!event)
396		return;
397	entry	= ring_buffer_event_data(event);
398	entry->prev_pid			= prev->pid;
399	entry->prev_prio		= prev->prio;
400	entry->prev_state		= prev->state;
401	entry->next_pid			= next->pid;
402	entry->next_prio		= next->prio;
403	entry->next_state		= next->state;
404	entry->next_cpu	= task_cpu(next);
405
406	if (!call_filter_check_discard(call, entry, buffer, event))
407		trace_buffer_unlock_commit(tr, buffer, event, flags, pc);
408}
409
410static void
411tracing_sched_wakeup_trace(struct trace_array *tr,
412			   struct task_struct *wakee,
413			   struct task_struct *curr,
414			   unsigned long flags, int pc)
415{
416	struct trace_event_call *call = &event_wakeup;
417	struct ring_buffer_event *event;
418	struct ctx_switch_entry *entry;
419	struct ring_buffer *buffer = tr->trace_buffer.buffer;
420
421	event = trace_buffer_lock_reserve(buffer, TRACE_WAKE,
422					  sizeof(*entry), flags, pc);
423	if (!event)
424		return;
425	entry	= ring_buffer_event_data(event);
426	entry->prev_pid			= curr->pid;
427	entry->prev_prio		= curr->prio;
428	entry->prev_state		= curr->state;
429	entry->next_pid			= wakee->pid;
430	entry->next_prio		= wakee->prio;
431	entry->next_state		= wakee->state;
432	entry->next_cpu			= task_cpu(wakee);
433
434	if (!call_filter_check_discard(call, entry, buffer, event))
435		trace_buffer_unlock_commit(tr, buffer, event, flags, pc);
436}
437
438static void notrace
439probe_wakeup_sched_switch(void *ignore, bool preempt,
440			  struct task_struct *prev, struct task_struct *next)
441{
442	struct trace_array_cpu *data;
443	u64 T0, T1, delta;
444	unsigned long flags;
445	long disabled;
446	int cpu;
447	int pc;
448
449	tracing_record_cmdline(prev);
450
451	if (unlikely(!tracer_enabled))
452		return;
453
454	/*
455	 * When we start a new trace, we set wakeup_task to NULL
456	 * and then set tracer_enabled = 1. We want to make sure
457	 * that another CPU does not see the tracer_enabled = 1
458	 * and the wakeup_task with an older task, that might
459	 * actually be the same as next.
460	 */
461	smp_rmb();
462
463	if (next != wakeup_task)
464		return;
465
466	pc = preempt_count();
467
468	/* disable local data, not wakeup_cpu data */
469	cpu = raw_smp_processor_id();
470	disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled);
471	if (likely(disabled != 1))
472		goto out;
473
474	local_irq_save(flags);
475	arch_spin_lock(&wakeup_lock);
476
477	/* We could race with grabbing wakeup_lock */
478	if (unlikely(!tracer_enabled || next != wakeup_task))
479		goto out_unlock;
480
481	/* The task we are waiting for is waking up */
482	data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu);
483
484	__trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
485	tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
486
487	T0 = data->preempt_timestamp;
488	T1 = ftrace_now(cpu);
489	delta = T1-T0;
490
491	if (!report_latency(wakeup_trace, delta))
492		goto out_unlock;
493
494	if (likely(!is_tracing_stopped())) {
495		wakeup_trace->max_latency = delta;
496		update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu);
497	}
498
499out_unlock:
500	__wakeup_reset(wakeup_trace);
501	arch_spin_unlock(&wakeup_lock);
502	local_irq_restore(flags);
503out:
504	atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled);
505}
506
507static void __wakeup_reset(struct trace_array *tr)
508{
509	wakeup_cpu = -1;
510	wakeup_prio = -1;
511	tracing_dl = 0;
512
513	if (wakeup_task)
514		put_task_struct(wakeup_task);
515
516	wakeup_task = NULL;
517}
518
519static void wakeup_reset(struct trace_array *tr)
520{
521	unsigned long flags;
522
523	tracing_reset_online_cpus(&tr->trace_buffer);
524
525	local_irq_save(flags);
526	arch_spin_lock(&wakeup_lock);
527	__wakeup_reset(tr);
528	arch_spin_unlock(&wakeup_lock);
529	local_irq_restore(flags);
530}
531
532static void
533probe_wakeup(void *ignore, struct task_struct *p)
534{
535	struct trace_array_cpu *data;
536	int cpu = smp_processor_id();
537	unsigned long flags;
538	long disabled;
539	int pc;
540
541	if (likely(!tracer_enabled))
542		return;
543
544	tracing_record_cmdline(p);
545	tracing_record_cmdline(current);
546
547	/*
548	 * Semantic is like this:
549	 *  - wakeup tracer handles all tasks in the system, independently
550	 *    from their scheduling class;
551	 *  - wakeup_rt tracer handles tasks belonging to sched_dl and
552	 *    sched_rt class;
553	 *  - wakeup_dl handles tasks belonging to sched_dl class only.
554	 */
555	if (tracing_dl || (wakeup_dl && !dl_task(p)) ||
556	    (wakeup_rt && !dl_task(p) && !rt_task(p)) ||
557	    (!dl_task(p) && (p->prio >= wakeup_prio || p->prio >= current->prio)))
558		return;
559
560	pc = preempt_count();
561	disabled = atomic_inc_return(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled);
562	if (unlikely(disabled != 1))
563		goto out;
564
565	/* interrupts should be off from try_to_wake_up */
566	arch_spin_lock(&wakeup_lock);
567
568	/* check for races. */
569	if (!tracer_enabled || tracing_dl ||
570	    (!dl_task(p) && p->prio >= wakeup_prio))
571		goto out_locked;
572
573	/* reset the trace */
574	__wakeup_reset(wakeup_trace);
575
576	wakeup_cpu = task_cpu(p);
577	wakeup_current_cpu = wakeup_cpu;
578	wakeup_prio = p->prio;
579
580	/*
581	 * Once you start tracing a -deadline task, don't bother tracing
582	 * another task until the first one wakes up.
583	 */
584	if (dl_task(p))
585		tracing_dl = 1;
586	else
587		tracing_dl = 0;
588
589	wakeup_task = p;
590	get_task_struct(wakeup_task);
591
592	local_save_flags(flags);
593
594	data = per_cpu_ptr(wakeup_trace->trace_buffer.data, wakeup_cpu);
595	data->preempt_timestamp = ftrace_now(cpu);
596	tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc);
597
598	/*
599	 * We must be careful in using CALLER_ADDR2. But since wake_up
600	 * is not called by an assembly function  (where as schedule is)
601	 * it should be safe to use it here.
602	 */
603	__trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
604
605out_locked:
606	arch_spin_unlock(&wakeup_lock);
607out:
608	atomic_dec(&per_cpu_ptr(wakeup_trace->trace_buffer.data, cpu)->disabled);
609}
610
611static void start_wakeup_tracer(struct trace_array *tr)
612{
613	int ret;
614
615	ret = register_trace_sched_wakeup(probe_wakeup, NULL);
616	if (ret) {
617		pr_info("wakeup trace: Couldn't activate tracepoint"
618			" probe to kernel_sched_wakeup\n");
619		return;
620	}
621
622	ret = register_trace_sched_wakeup_new(probe_wakeup, NULL);
623	if (ret) {
624		pr_info("wakeup trace: Couldn't activate tracepoint"
625			" probe to kernel_sched_wakeup_new\n");
626		goto fail_deprobe;
627	}
628
629	ret = register_trace_sched_switch(probe_wakeup_sched_switch, NULL);
630	if (ret) {
631		pr_info("sched trace: Couldn't activate tracepoint"
632			" probe to kernel_sched_switch\n");
633		goto fail_deprobe_wake_new;
634	}
635
636	ret = register_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL);
637	if (ret) {
638		pr_info("wakeup trace: Couldn't activate tracepoint"
639			" probe to kernel_sched_migrate_task\n");
640		return;
641	}
642
643	wakeup_reset(tr);
644
645	/*
646	 * Don't let the tracer_enabled = 1 show up before
647	 * the wakeup_task is reset. This may be overkill since
648	 * wakeup_reset does a spin_unlock after setting the
649	 * wakeup_task to NULL, but I want to be safe.
650	 * This is a slow path anyway.
651	 */
652	smp_wmb();
653
654	if (start_func_tracer(tr, is_graph(tr)))
655		printk(KERN_ERR "failed to start wakeup tracer\n");
656
657	return;
658fail_deprobe_wake_new:
659	unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
660fail_deprobe:
661	unregister_trace_sched_wakeup(probe_wakeup, NULL);
662}
663
664static void stop_wakeup_tracer(struct trace_array *tr)
665{
666	tracer_enabled = 0;
667	stop_func_tracer(tr, is_graph(tr));
668	unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
669	unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
670	unregister_trace_sched_wakeup(probe_wakeup, NULL);
671	unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL);
672}
673
674static bool wakeup_busy;
675
676static int __wakeup_tracer_init(struct trace_array *tr)
677{
678	save_flags = tr->trace_flags;
679
680	/* non overwrite screws up the latency tracers */
681	set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
682	set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1);
683
684	tr->max_latency = 0;
685	wakeup_trace = tr;
686	ftrace_init_array_ops(tr, wakeup_tracer_call);
687	start_wakeup_tracer(tr);
688
689	wakeup_busy = true;
690	return 0;
691}
692
693static int wakeup_tracer_init(struct trace_array *tr)
694{
695	if (wakeup_busy)
696		return -EBUSY;
697
698	wakeup_dl = 0;
699	wakeup_rt = 0;
700	return __wakeup_tracer_init(tr);
701}
702
703static int wakeup_rt_tracer_init(struct trace_array *tr)
704{
705	if (wakeup_busy)
706		return -EBUSY;
707
708	wakeup_dl = 0;
709	wakeup_rt = 1;
710	return __wakeup_tracer_init(tr);
711}
712
713static int wakeup_dl_tracer_init(struct trace_array *tr)
714{
715	if (wakeup_busy)
716		return -EBUSY;
717
718	wakeup_dl = 1;
719	wakeup_rt = 0;
720	return __wakeup_tracer_init(tr);
721}
722
723static void wakeup_tracer_reset(struct trace_array *tr)
724{
725	int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
726	int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;
727
728	stop_wakeup_tracer(tr);
729	/* make sure we put back any tasks we are tracing */
730	wakeup_reset(tr);
731
732	set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
733	set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
734	ftrace_reset_array_ops(tr);
735	wakeup_busy = false;
736}
737
738static void wakeup_tracer_start(struct trace_array *tr)
739{
740	wakeup_reset(tr);
741	tracer_enabled = 1;
742}
743
744static void wakeup_tracer_stop(struct trace_array *tr)
745{
746	tracer_enabled = 0;
747}
748
749static struct tracer wakeup_tracer __read_mostly =
750{
751	.name		= "wakeup",
752	.init		= wakeup_tracer_init,
753	.reset		= wakeup_tracer_reset,
754	.start		= wakeup_tracer_start,
755	.stop		= wakeup_tracer_stop,
756	.print_max	= true,
757	.print_header	= wakeup_print_header,
758	.print_line	= wakeup_print_line,
759	.flag_changed	= wakeup_flag_changed,
 
760#ifdef CONFIG_FTRACE_SELFTEST
761	.selftest    = trace_selftest_startup_wakeup,
762#endif
763	.open		= wakeup_trace_open,
764	.close		= wakeup_trace_close,
765	.allow_instances = true,
766	.use_max_tr	= true,
767};
768
769static struct tracer wakeup_rt_tracer __read_mostly =
770{
771	.name		= "wakeup_rt",
772	.init		= wakeup_rt_tracer_init,
773	.reset		= wakeup_tracer_reset,
774	.start		= wakeup_tracer_start,
775	.stop		= wakeup_tracer_stop,
776	.print_max	= true,
 
777	.print_header	= wakeup_print_header,
778	.print_line	= wakeup_print_line,
779	.flag_changed	= wakeup_flag_changed,
 
780#ifdef CONFIG_FTRACE_SELFTEST
781	.selftest    = trace_selftest_startup_wakeup,
782#endif
783	.open		= wakeup_trace_open,
784	.close		= wakeup_trace_close,
785	.allow_instances = true,
786	.use_max_tr	= true,
787};
788
789static struct tracer wakeup_dl_tracer __read_mostly =
790{
791	.name		= "wakeup_dl",
792	.init		= wakeup_dl_tracer_init,
793	.reset		= wakeup_tracer_reset,
794	.start		= wakeup_tracer_start,
795	.stop		= wakeup_tracer_stop,
796	.print_max	= true,
797	.print_header	= wakeup_print_header,
798	.print_line	= wakeup_print_line,
799	.flag_changed	= wakeup_flag_changed,
800#ifdef CONFIG_FTRACE_SELFTEST
801	.selftest    = trace_selftest_startup_wakeup,
802#endif
803	.open		= wakeup_trace_open,
804	.close		= wakeup_trace_close,
805	.allow_instances = true,
806	.use_max_tr	= true,
807};
808
809__init static int init_wakeup_tracer(void)
810{
811	int ret;
812
813	ret = register_tracer(&wakeup_tracer);
814	if (ret)
815		return ret;
816
817	ret = register_tracer(&wakeup_rt_tracer);
818	if (ret)
819		return ret;
820
821	ret = register_tracer(&wakeup_dl_tracer);
822	if (ret)
823		return ret;
824
825	return 0;
826}
827core_initcall(init_wakeup_tracer);