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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace task wakeup timings
4 *
5 * Copyright (C) 2007-2008 Steven Rostedt <[email protected]>
6 * Copyright (C) 2008 Ingo Molnar <[email protected]>
7 *
8 * Based on code from the latency_tracer, that is:
9 *
10 * Copyright (C) 2004-2006 Ingo Molnar
11 * Copyright (C) 2004 Nadia Yvette Chambers
12 */
13#include <linux/module.h>
14#include <linux/kallsyms.h>
15#include <linux/uaccess.h>
16#include <linux/ftrace.h>
17#include <linux/sched/rt.h>
18#include <linux/sched/deadline.h>
19#include <trace/events/sched.h>
20#include "trace.h"
21
22static struct trace_array *wakeup_trace;
23static int __read_mostly tracer_enabled;
24
25static struct task_struct *wakeup_task;
26static int wakeup_cpu;
27static int wakeup_current_cpu;
28static unsigned wakeup_prio = -1;
29static bool wakeup_rt;
30static bool wakeup_dl;
31static bool tracing_dl;
32
33static arch_spinlock_t wakeup_lock =
34 (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
35
36static void wakeup_reset(struct trace_array *tr);
37static void __wakeup_reset(struct trace_array *tr);
38static int start_func_tracer(struct trace_array *tr, int graph);
39static void stop_func_tracer(struct trace_array *tr, int graph);
40
41static int save_flags;
42
43#ifdef CONFIG_FUNCTION_GRAPH_TRACER
44# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER(DISPLAY_GRAPH))
45#else
46# define is_graph(tr) false
47#endif
48
49#ifdef CONFIG_FUNCTION_TRACER
50
51static bool function_enabled;
52
53/*
54 * Prologue for the wakeup function tracers.
55 *
56 * Returns 1 if it is OK to continue, and preemption
57 * is disabled and data->disabled is incremented.
58 * 0 if the trace is to be ignored, and preemption
59 * is not disabled and data->disabled is
60 * kept the same.
61 *
62 * Note, this function is also used outside this ifdef but
63 * inside the #ifdef of the function graph tracer below.
64 * This is OK, since the function graph tracer is
65 * dependent on the function tracer.
66 */
67static int
68func_prolog_preempt_disable(struct trace_array *tr,
69 struct trace_array_cpu **data,
70 unsigned int *trace_ctx)
71{
72 long disabled;
73 int cpu;
74
75 if (likely(!wakeup_task))
76 return 0;
77
78 *trace_ctx = tracing_gen_ctx();
79 preempt_disable_notrace();
80
81 cpu = raw_smp_processor_id();
82 if (cpu != wakeup_current_cpu)
83 goto out_enable;
84
85 *data = per_cpu_ptr(tr->array_buffer.data, cpu);
86 disabled = local_inc_return(&(*data)->disabled);
87 if (unlikely(disabled != 1))
88 goto out;
89
90 return 1;
91
92out:
93 local_dec(&(*data)->disabled);
94
95out_enable:
96 preempt_enable_notrace();
97 return 0;
98}
99
100#ifdef CONFIG_FUNCTION_GRAPH_TRACER
101
102static int wakeup_display_graph(struct trace_array *tr, int set)
103{
104 if (!(is_graph(tr) ^ set))
105 return 0;
106
107 stop_func_tracer(tr, !set);
108
109 wakeup_reset(wakeup_trace);
110 tr->max_latency = 0;
111
112 return start_func_tracer(tr, set);
113}
114
115static int wakeup_graph_entry(struct ftrace_graph_ent *trace,
116 struct fgraph_ops *gops,
117 struct ftrace_regs *fregs)
118{
119 struct trace_array *tr = wakeup_trace;
120 struct trace_array_cpu *data;
121 unsigned int trace_ctx;
122 u64 *calltime;
123 int ret = 0;
124
125 if (ftrace_graph_ignore_func(gops, trace))
126 return 0;
127 /*
128 * Do not trace a function if it's filtered by set_graph_notrace.
129 * Make the index of ret stack negative to indicate that it should
130 * ignore further functions. But it needs its own ret stack entry
131 * to recover the original index in order to continue tracing after
132 * returning from the function.
133 */
134 if (ftrace_graph_notrace_addr(trace->func))
135 return 1;
136
137 if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
138 return 0;
139
140 calltime = fgraph_reserve_data(gops->idx, sizeof(*calltime));
141 if (calltime) {
142 *calltime = trace_clock_local();
143 ret = __trace_graph_entry(tr, trace, trace_ctx);
144 }
145 local_dec(&data->disabled);
146 preempt_enable_notrace();
147
148 return ret;
149}
150
151static void wakeup_graph_return(struct ftrace_graph_ret *trace,
152 struct fgraph_ops *gops,
153 struct ftrace_regs *fregs)
154{
155 struct trace_array *tr = wakeup_trace;
156 struct trace_array_cpu *data;
157 unsigned int trace_ctx;
158 u64 *calltime;
159 u64 rettime;
160 int size;
161
162 ftrace_graph_addr_finish(gops, trace);
163
164 if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
165 return;
166
167 rettime = trace_clock_local();
168
169 calltime = fgraph_retrieve_data(gops->idx, &size);
170 if (calltime)
171 __trace_graph_return(tr, trace, trace_ctx, *calltime, rettime);
172
173 local_dec(&data->disabled);
174 preempt_enable_notrace();
175 return;
176}
177
178static struct fgraph_ops fgraph_wakeup_ops = {
179 .entryfunc = &wakeup_graph_entry,
180 .retfunc = &wakeup_graph_return,
181};
182
183static void wakeup_trace_open(struct trace_iterator *iter)
184{
185 if (is_graph(iter->tr))
186 graph_trace_open(iter);
187}
188
189static void wakeup_trace_close(struct trace_iterator *iter)
190{
191 if (iter->private)
192 graph_trace_close(iter);
193}
194
195#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \
196 TRACE_GRAPH_PRINT_CPU | \
197 TRACE_GRAPH_PRINT_REL_TIME | \
198 TRACE_GRAPH_PRINT_DURATION | \
199 TRACE_GRAPH_PRINT_OVERHEAD | \
200 TRACE_GRAPH_PRINT_IRQS)
201
202static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
203{
204 /*
205 * In graph mode call the graph tracer output function,
206 * otherwise go with the TRACE_FN event handler
207 */
208 if (is_graph(iter->tr))
209 return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
210
211 return TRACE_TYPE_UNHANDLED;
212}
213
214static void wakeup_print_header(struct seq_file *s)
215{
216 if (is_graph(wakeup_trace))
217 print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
218 else
219 trace_default_header(s);
220}
221#endif /* else CONFIG_FUNCTION_GRAPH_TRACER */
222
223/*
224 * wakeup uses its own tracer function to keep the overhead down:
225 */
226static void
227wakeup_tracer_call(unsigned long ip, unsigned long parent_ip,
228 struct ftrace_ops *op, struct ftrace_regs *fregs)
229{
230 struct trace_array *tr = wakeup_trace;
231 struct trace_array_cpu *data;
232 unsigned long flags;
233 unsigned int trace_ctx;
234
235 if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
236 return;
237
238 local_irq_save(flags);
239 trace_function(tr, ip, parent_ip, trace_ctx, fregs);
240 local_irq_restore(flags);
241
242 local_dec(&data->disabled);
243 preempt_enable_notrace();
244}
245
246static int register_wakeup_function(struct trace_array *tr, int graph, int set)
247{
248 int ret;
249
250 /* 'set' is set if TRACE_ITER(FUNCTION) is about to be set */
251 if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER(FUNCTION))))
252 return 0;
253
254 if (graph)
255 ret = register_ftrace_graph(&fgraph_wakeup_ops);
256 else
257 ret = register_ftrace_function(tr->ops);
258
259 if (!ret)
260 function_enabled = true;
261
262 return ret;
263}
264
265static void unregister_wakeup_function(struct trace_array *tr, int graph)
266{
267 if (!function_enabled)
268 return;
269
270 if (graph)
271 unregister_ftrace_graph(&fgraph_wakeup_ops);
272 else
273 unregister_ftrace_function(tr->ops);
274
275 function_enabled = false;
276}
277
278static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
279{
280 if (!(mask & TRACE_ITER(FUNCTION)))
281 return 0;
282
283 if (set)
284 register_wakeup_function(tr, is_graph(tr), 1);
285 else
286 unregister_wakeup_function(tr, is_graph(tr));
287 return 1;
288}
289#else /* CONFIG_FUNCTION_TRACER */
290static int register_wakeup_function(struct trace_array *tr, int graph, int set)
291{
292 return 0;
293}
294static void unregister_wakeup_function(struct trace_array *tr, int graph) { }
295static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
296{
297 return 0;
298}
299#endif /* else CONFIG_FUNCTION_TRACER */
300
301#ifndef CONFIG_FUNCTION_GRAPH_TRACER
302static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
303{
304 return TRACE_TYPE_UNHANDLED;
305}
306
307static void wakeup_trace_open(struct trace_iterator *iter) { }
308static void wakeup_trace_close(struct trace_iterator *iter) { }
309
310static void wakeup_print_header(struct seq_file *s)
311{
312 trace_default_header(s);
313}
314#endif /* !CONFIG_FUNCTION_GRAPH_TRACER */
315
316static void
317__trace_function(struct trace_array *tr,
318 unsigned long ip, unsigned long parent_ip,
319 unsigned int trace_ctx)
320{
321 if (is_graph(tr))
322 trace_graph_function(tr, ip, parent_ip, trace_ctx);
323 else
324 trace_function(tr, ip, parent_ip, trace_ctx, NULL);
325}
326
327static int wakeup_flag_changed(struct trace_array *tr, u64 mask, int set)
328{
329 struct tracer *tracer = tr->current_trace;
330
331 if (wakeup_function_set(tr, mask, set))
332 return 0;
333
334#ifdef CONFIG_FUNCTION_GRAPH_TRACER
335 if (mask & TRACE_ITER(DISPLAY_GRAPH))
336 return wakeup_display_graph(tr, set);
337#endif
338
339 return trace_keep_overwrite(tracer, mask, set);
340}
341
342static int start_func_tracer(struct trace_array *tr, int graph)
343{
344 int ret;
345
346 ret = register_wakeup_function(tr, graph, 0);
347
348 if (!ret && tracing_is_enabled())
349 tracer_enabled = 1;
350 else
351 tracer_enabled = 0;
352
353 return ret;
354}
355
356static void stop_func_tracer(struct trace_array *tr, int graph)
357{
358 tracer_enabled = 0;
359
360 unregister_wakeup_function(tr, graph);
361}
362
363/*
364 * Should this new latency be reported/recorded?
365 */
366static bool report_latency(struct trace_array *tr, u64 delta)
367{
368 if (tracing_thresh) {
369 if (delta < tracing_thresh)
370 return false;
371 } else {
372 if (delta <= tr->max_latency)
373 return false;
374 }
375 return true;
376}
377
378static void
379probe_wakeup_migrate_task(void *ignore, struct task_struct *task, int cpu)
380{
381 if (task != wakeup_task)
382 return;
383
384 wakeup_current_cpu = cpu;
385}
386
387static void
388tracing_sched_switch_trace(struct trace_array *tr,
389 struct task_struct *prev,
390 struct task_struct *next,
391 unsigned int trace_ctx)
392{
393 struct trace_buffer *buffer = tr->array_buffer.buffer;
394 struct ring_buffer_event *event;
395 struct ctx_switch_entry *entry;
396
397 event = trace_buffer_lock_reserve(buffer, TRACE_CTX,
398 sizeof(*entry), trace_ctx);
399 if (!event)
400 return;
401 entry = ring_buffer_event_data(event);
402 entry->prev_pid = prev->pid;
403 entry->prev_prio = prev->prio;
404 entry->prev_state = task_state_index(prev);
405 entry->next_pid = next->pid;
406 entry->next_prio = next->prio;
407 entry->next_state = task_state_index(next);
408 entry->next_cpu = task_cpu(next);
409
410 trace_buffer_unlock_commit(tr, buffer, event, trace_ctx);
411}
412
413static void
414tracing_sched_wakeup_trace(struct trace_array *tr,
415 struct task_struct *wakee,
416 struct task_struct *curr,
417 unsigned int trace_ctx)
418{
419 struct ring_buffer_event *event;
420 struct ctx_switch_entry *entry;
421 struct trace_buffer *buffer = tr->array_buffer.buffer;
422
423 event = trace_buffer_lock_reserve(buffer, TRACE_WAKE,
424 sizeof(*entry), trace_ctx);
425 if (!event)
426 return;
427 entry = ring_buffer_event_data(event);
428 entry->prev_pid = curr->pid;
429 entry->prev_prio = curr->prio;
430 entry->prev_state = task_state_index(curr);
431 entry->next_pid = wakee->pid;
432 entry->next_prio = wakee->prio;
433 entry->next_state = task_state_index(wakee);
434 entry->next_cpu = task_cpu(wakee);
435
436 trace_buffer_unlock_commit(tr, buffer, event, trace_ctx);
437}
438
439static void notrace
440probe_wakeup_sched_switch(void *ignore, bool preempt,
441 struct task_struct *prev, struct task_struct *next,
442 unsigned int prev_state)
443{
444 struct trace_array_cpu *data;
445 u64 T0, T1, delta;
446 unsigned long flags;
447 long disabled;
448 int cpu;
449 unsigned int trace_ctx;
450
451 tracing_record_cmdline(prev);
452
453 if (unlikely(!tracer_enabled))
454 return;
455
456 /*
457 * When we start a new trace, we set wakeup_task to NULL
458 * and then set tracer_enabled = 1. We want to make sure
459 * that another CPU does not see the tracer_enabled = 1
460 * and the wakeup_task with an older task, that might
461 * actually be the same as next.
462 */
463 smp_rmb();
464
465 if (next != wakeup_task)
466 return;
467
468 /* disable local data, not wakeup_cpu data */
469 cpu = raw_smp_processor_id();
470 disabled = local_inc_return(&per_cpu_ptr(wakeup_trace->array_buffer.data, cpu)->disabled);
471 if (likely(disabled != 1))
472 goto out;
473
474 local_irq_save(flags);
475 trace_ctx = tracing_gen_ctx_flags(flags);
476
477 arch_spin_lock(&wakeup_lock);
478
479 /* We could race with grabbing wakeup_lock */
480 if (unlikely(!tracer_enabled || next != wakeup_task))
481 goto out_unlock;
482
483 /* The task we are waiting for is waking up */
484 data = per_cpu_ptr(wakeup_trace->array_buffer.data, wakeup_cpu);
485
486 __trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, trace_ctx);
487 tracing_sched_switch_trace(wakeup_trace, prev, next, trace_ctx);
488 __trace_stack(wakeup_trace, trace_ctx, 0);
489
490 T0 = data->preempt_timestamp;
491 T1 = ftrace_now(cpu);
492 delta = T1-T0;
493
494 if (!report_latency(wakeup_trace, delta))
495 goto out_unlock;
496
497 if (likely(!is_tracing_stopped())) {
498 wakeup_trace->max_latency = delta;
499 update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu, NULL);
500 }
501
502out_unlock:
503 __wakeup_reset(wakeup_trace);
504 arch_spin_unlock(&wakeup_lock);
505 local_irq_restore(flags);
506out:
507 local_dec(&per_cpu_ptr(wakeup_trace->array_buffer.data, cpu)->disabled);
508}
509
510static void __wakeup_reset(struct trace_array *tr)
511{
512 wakeup_cpu = -1;
513 wakeup_prio = -1;
514 tracing_dl = false;
515
516 if (wakeup_task)
517 put_task_struct(wakeup_task);
518
519 wakeup_task = NULL;
520}
521
522static void wakeup_reset(struct trace_array *tr)
523{
524 unsigned long flags;
525
526 tracing_reset_online_cpus(&tr->array_buffer);
527
528 local_irq_save(flags);
529 arch_spin_lock(&wakeup_lock);
530 __wakeup_reset(tr);
531 arch_spin_unlock(&wakeup_lock);
532 local_irq_restore(flags);
533}
534
535static void
536probe_wakeup(void *ignore, struct task_struct *p)
537{
538 struct trace_array_cpu *data;
539 int cpu = smp_processor_id();
540 long disabled;
541 unsigned int trace_ctx;
542
543 if (likely(!tracer_enabled))
544 return;
545
546 tracing_record_cmdline(p);
547 tracing_record_cmdline(current);
548
549 /*
550 * Semantic is like this:
551 * - wakeup tracer handles all tasks in the system, independently
552 * from their scheduling class;
553 * - wakeup_rt tracer handles tasks belonging to sched_dl and
554 * sched_rt class;
555 * - wakeup_dl handles tasks belonging to sched_dl class only.
556 */
557 if (tracing_dl || (wakeup_dl && !dl_task(p)) ||
558 (wakeup_rt && !rt_or_dl_task(p)) ||
559 (!dl_task(p) && (p->prio >= wakeup_prio || p->prio >= current->prio)))
560 return;
561
562 disabled = local_inc_return(&per_cpu_ptr(wakeup_trace->array_buffer.data, cpu)->disabled);
563 if (unlikely(disabled != 1))
564 goto out;
565
566 trace_ctx = tracing_gen_ctx();
567
568 /* interrupts should be off from try_to_wake_up */
569 arch_spin_lock(&wakeup_lock);
570
571 /* check for races. */
572 if (!tracer_enabled || tracing_dl ||
573 (!dl_task(p) && p->prio >= wakeup_prio))
574 goto out_locked;
575
576 /* reset the trace */
577 __wakeup_reset(wakeup_trace);
578
579 wakeup_cpu = task_cpu(p);
580 wakeup_current_cpu = wakeup_cpu;
581 wakeup_prio = p->prio;
582
583 /*
584 * Once you start tracing a -deadline task, don't bother tracing
585 * another task until the first one wakes up.
586 */
587 if (dl_task(p))
588 tracing_dl = true;
589 else
590 tracing_dl = false;
591
592 wakeup_task = get_task_struct(p);
593
594 data = per_cpu_ptr(wakeup_trace->array_buffer.data, wakeup_cpu);
595 data->preempt_timestamp = ftrace_now(cpu);
596 tracing_sched_wakeup_trace(wakeup_trace, p, current, trace_ctx);
597 __trace_stack(wakeup_trace, trace_ctx, 0);
598
599 /*
600 * We must be careful in using CALLER_ADDR2. But since wake_up
601 * is not called by an assembly function (where as schedule is)
602 * it should be safe to use it here.
603 */
604 __trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, trace_ctx);
605
606out_locked:
607 arch_spin_unlock(&wakeup_lock);
608out:
609 local_dec(&per_cpu_ptr(wakeup_trace->array_buffer.data, cpu)->disabled);
610}
611
612static void start_wakeup_tracer(struct trace_array *tr)
613{
614 int ret;
615
616 ret = register_trace_sched_wakeup(probe_wakeup, NULL);
617 if (ret) {
618 pr_info("wakeup trace: Couldn't activate tracepoint"
619 " probe to kernel_sched_wakeup\n");
620 return;
621 }
622
623 ret = register_trace_sched_wakeup_new(probe_wakeup, NULL);
624 if (ret) {
625 pr_info("wakeup trace: Couldn't activate tracepoint"
626 " probe to kernel_sched_wakeup_new\n");
627 goto fail_deprobe;
628 }
629
630 ret = register_trace_sched_switch(probe_wakeup_sched_switch, NULL);
631 if (ret) {
632 pr_info("sched trace: Couldn't activate tracepoint"
633 " probe to kernel_sched_switch\n");
634 goto fail_deprobe_wake_new;
635 }
636
637 ret = register_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL);
638 if (ret) {
639 pr_info("wakeup trace: Couldn't activate tracepoint"
640 " probe to kernel_sched_migrate_task\n");
641 goto fail_deprobe_sched_switch;
642 }
643
644 wakeup_reset(tr);
645
646 /*
647 * Don't let the tracer_enabled = 1 show up before
648 * the wakeup_task is reset. This may be overkill since
649 * wakeup_reset does a spin_unlock after setting the
650 * wakeup_task to NULL, but I want to be safe.
651 * This is a slow path anyway.
652 */
653 smp_wmb();
654
655 if (start_func_tracer(tr, is_graph(tr)))
656 printk(KERN_ERR "failed to start wakeup tracer\n");
657
658 return;
659fail_deprobe_sched_switch:
660 unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
661fail_deprobe_wake_new:
662 unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
663fail_deprobe:
664 unregister_trace_sched_wakeup(probe_wakeup, NULL);
665}
666
667static void stop_wakeup_tracer(struct trace_array *tr)
668{
669 tracer_enabled = 0;
670 stop_func_tracer(tr, is_graph(tr));
671 unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
672 unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
673 unregister_trace_sched_wakeup(probe_wakeup, NULL);
674 unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL);
675}
676
677static bool wakeup_busy;
678
679static int __wakeup_tracer_init(struct trace_array *tr)
680{
681 save_flags = tr->trace_flags;
682
683 /* non overwrite screws up the latency tracers */
684 set_tracer_flag(tr, TRACE_ITER(OVERWRITE), 1);
685 set_tracer_flag(tr, TRACE_ITER(LATENCY_FMT), 1);
686
687 tr->max_latency = 0;
688 wakeup_trace = tr;
689 ftrace_init_array_ops(tr, wakeup_tracer_call);
690 start_wakeup_tracer(tr);
691
692 wakeup_busy = true;
693 return 0;
694}
695
696static int wakeup_tracer_init(struct trace_array *tr)
697{
698 if (wakeup_busy)
699 return -EBUSY;
700
701 wakeup_dl = false;
702 wakeup_rt = false;
703 return __wakeup_tracer_init(tr);
704}
705
706static int wakeup_rt_tracer_init(struct trace_array *tr)
707{
708 if (wakeup_busy)
709 return -EBUSY;
710
711 wakeup_dl = false;
712 wakeup_rt = true;
713 return __wakeup_tracer_init(tr);
714}
715
716static int wakeup_dl_tracer_init(struct trace_array *tr)
717{
718 if (wakeup_busy)
719 return -EBUSY;
720
721 wakeup_dl = true;
722 wakeup_rt = false;
723 return __wakeup_tracer_init(tr);
724}
725
726static void wakeup_tracer_reset(struct trace_array *tr)
727{
728 int lat_flag = save_flags & TRACE_ITER(LATENCY_FMT);
729 int overwrite_flag = save_flags & TRACE_ITER(OVERWRITE);
730
731 stop_wakeup_tracer(tr);
732 /* make sure we put back any tasks we are tracing */
733 wakeup_reset(tr);
734
735 set_tracer_flag(tr, TRACE_ITER(LATENCY_FMT), lat_flag);
736 set_tracer_flag(tr, TRACE_ITER(OVERWRITE), overwrite_flag);
737 ftrace_reset_array_ops(tr);
738 wakeup_busy = false;
739}
740
741static void wakeup_tracer_start(struct trace_array *tr)
742{
743 wakeup_reset(tr);
744 tracer_enabled = 1;
745}
746
747static void wakeup_tracer_stop(struct trace_array *tr)
748{
749 tracer_enabled = 0;
750}
751
752static struct tracer wakeup_tracer __read_mostly =
753{
754 .name = "wakeup",
755 .init = wakeup_tracer_init,
756 .reset = wakeup_tracer_reset,
757 .start = wakeup_tracer_start,
758 .stop = wakeup_tracer_stop,
759 .print_max = true,
760 .print_header = wakeup_print_header,
761 .print_line = wakeup_print_line,
762 .flag_changed = wakeup_flag_changed,
763#ifdef CONFIG_FTRACE_SELFTEST
764 .selftest = trace_selftest_startup_wakeup,
765#endif
766 .open = wakeup_trace_open,
767 .close = wakeup_trace_close,
768 .allow_instances = true,
769 .use_max_tr = true,
770};
771
772static struct tracer wakeup_rt_tracer __read_mostly =
773{
774 .name = "wakeup_rt",
775 .init = wakeup_rt_tracer_init,
776 .reset = wakeup_tracer_reset,
777 .start = wakeup_tracer_start,
778 .stop = wakeup_tracer_stop,
779 .print_max = true,
780 .print_header = wakeup_print_header,
781 .print_line = wakeup_print_line,
782 .flag_changed = wakeup_flag_changed,
783#ifdef CONFIG_FTRACE_SELFTEST
784 .selftest = trace_selftest_startup_wakeup,
785#endif
786 .open = wakeup_trace_open,
787 .close = wakeup_trace_close,
788 .allow_instances = true,
789 .use_max_tr = true,
790};
791
792static struct tracer wakeup_dl_tracer __read_mostly =
793{
794 .name = "wakeup_dl",
795 .init = wakeup_dl_tracer_init,
796 .reset = wakeup_tracer_reset,
797 .start = wakeup_tracer_start,
798 .stop = wakeup_tracer_stop,
799 .print_max = true,
800 .print_header = wakeup_print_header,
801 .print_line = wakeup_print_line,
802 .flag_changed = wakeup_flag_changed,
803#ifdef CONFIG_FTRACE_SELFTEST
804 .selftest = trace_selftest_startup_wakeup,
805#endif
806 .open = wakeup_trace_open,
807 .close = wakeup_trace_close,
808 .allow_instances = true,
809 .use_max_tr = true,
810};
811
812__init static int init_wakeup_tracer(void)
813{
814 int ret;
815
816 ret = register_tracer(&wakeup_tracer);
817 if (ret)
818 return ret;
819
820 ret = register_tracer(&wakeup_rt_tracer);
821 if (ret)
822 return ret;
823
824 ret = register_tracer(&wakeup_dl_tracer);
825 if (ret)
826 return ret;
827
828 return 0;
829}
830core_initcall(init_wakeup_tracer);