GNU Linux-libre 5.10.219-gnu1
[releases.git] / tools / perf / builtin-lock.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <inttypes.h>
4 #include "builtin.h"
5 #include "perf.h"
6
7 #include "util/evlist.h" // for struct evsel_str_handler
8 #include "util/evsel.h"
9 #include "util/symbol.h"
10 #include "util/thread.h"
11 #include "util/header.h"
12
13 #include <subcmd/pager.h>
14 #include <subcmd/parse-options.h>
15 #include "util/trace-event.h"
16
17 #include "util/debug.h"
18 #include "util/session.h"
19 #include "util/tool.h"
20 #include "util/data.h"
21
22 #include <sys/types.h>
23 #include <sys/prctl.h>
24 #include <semaphore.h>
25 #include <pthread.h>
26 #include <math.h>
27 #include <limits.h>
28
29 #include <linux/list.h>
30 #include <linux/hash.h>
31 #include <linux/kernel.h>
32 #include <linux/zalloc.h>
33 #include <linux/err.h>
34
35 static struct perf_session *session;
36
37 /* based on kernel/lockdep.c */
38 #define LOCKHASH_BITS           12
39 #define LOCKHASH_SIZE           (1UL << LOCKHASH_BITS)
40
41 static struct list_head lockhash_table[LOCKHASH_SIZE];
42
43 #define __lockhashfn(key)       hash_long((unsigned long)key, LOCKHASH_BITS)
44 #define lockhashentry(key)      (lockhash_table + __lockhashfn((key)))
45
46 struct lock_stat {
47         struct list_head        hash_entry;
48         struct rb_node          rb;             /* used for sorting */
49
50         /*
51          * FIXME: evsel__intval() returns u64,
52          * so address of lockdep_map should be dealed as 64bit.
53          * Is there more better solution?
54          */
55         void                    *addr;          /* address of lockdep_map, used as ID */
56         char                    *name;          /* for strcpy(), we cannot use const */
57
58         unsigned int            nr_acquire;
59         unsigned int            nr_acquired;
60         unsigned int            nr_contended;
61         unsigned int            nr_release;
62
63         unsigned int            nr_readlock;
64         unsigned int            nr_trylock;
65
66         /* these times are in nano sec. */
67         u64                     avg_wait_time;
68         u64                     wait_time_total;
69         u64                     wait_time_min;
70         u64                     wait_time_max;
71
72         int                     discard; /* flag of blacklist */
73 };
74
75 /*
76  * States of lock_seq_stat
77  *
78  * UNINITIALIZED is required for detecting first event of acquire.
79  * As the nature of lock events, there is no guarantee
80  * that the first event for the locks are acquire,
81  * it can be acquired, contended or release.
82  */
83 #define SEQ_STATE_UNINITIALIZED      0         /* initial state */
84 #define SEQ_STATE_RELEASED      1
85 #define SEQ_STATE_ACQUIRING     2
86 #define SEQ_STATE_ACQUIRED      3
87 #define SEQ_STATE_READ_ACQUIRED 4
88 #define SEQ_STATE_CONTENDED     5
89
90 /*
91  * MAX_LOCK_DEPTH
92  * Imported from include/linux/sched.h.
93  * Should this be synchronized?
94  */
95 #define MAX_LOCK_DEPTH 48
96
97 /*
98  * struct lock_seq_stat:
99  * Place to put on state of one lock sequence
100  * 1) acquire -> acquired -> release
101  * 2) acquire -> contended -> acquired -> release
102  * 3) acquire (with read or try) -> release
103  * 4) Are there other patterns?
104  */
105 struct lock_seq_stat {
106         struct list_head        list;
107         int                     state;
108         u64                     prev_event_time;
109         void                    *addr;
110
111         int                     read_count;
112 };
113
114 struct thread_stat {
115         struct rb_node          rb;
116
117         u32                     tid;
118         struct list_head        seq_list;
119 };
120
121 static struct rb_root           thread_stats;
122
123 static struct thread_stat *thread_stat_find(u32 tid)
124 {
125         struct rb_node *node;
126         struct thread_stat *st;
127
128         node = thread_stats.rb_node;
129         while (node) {
130                 st = container_of(node, struct thread_stat, rb);
131                 if (st->tid == tid)
132                         return st;
133                 else if (tid < st->tid)
134                         node = node->rb_left;
135                 else
136                         node = node->rb_right;
137         }
138
139         return NULL;
140 }
141
142 static void thread_stat_insert(struct thread_stat *new)
143 {
144         struct rb_node **rb = &thread_stats.rb_node;
145         struct rb_node *parent = NULL;
146         struct thread_stat *p;
147
148         while (*rb) {
149                 p = container_of(*rb, struct thread_stat, rb);
150                 parent = *rb;
151
152                 if (new->tid < p->tid)
153                         rb = &(*rb)->rb_left;
154                 else if (new->tid > p->tid)
155                         rb = &(*rb)->rb_right;
156                 else
157                         BUG_ON("inserting invalid thread_stat\n");
158         }
159
160         rb_link_node(&new->rb, parent, rb);
161         rb_insert_color(&new->rb, &thread_stats);
162 }
163
164 static struct thread_stat *thread_stat_findnew_after_first(u32 tid)
165 {
166         struct thread_stat *st;
167
168         st = thread_stat_find(tid);
169         if (st)
170                 return st;
171
172         st = zalloc(sizeof(struct thread_stat));
173         if (!st) {
174                 pr_err("memory allocation failed\n");
175                 return NULL;
176         }
177
178         st->tid = tid;
179         INIT_LIST_HEAD(&st->seq_list);
180
181         thread_stat_insert(st);
182
183         return st;
184 }
185
186 static struct thread_stat *thread_stat_findnew_first(u32 tid);
187 static struct thread_stat *(*thread_stat_findnew)(u32 tid) =
188         thread_stat_findnew_first;
189
190 static struct thread_stat *thread_stat_findnew_first(u32 tid)
191 {
192         struct thread_stat *st;
193
194         st = zalloc(sizeof(struct thread_stat));
195         if (!st) {
196                 pr_err("memory allocation failed\n");
197                 return NULL;
198         }
199         st->tid = tid;
200         INIT_LIST_HEAD(&st->seq_list);
201
202         rb_link_node(&st->rb, NULL, &thread_stats.rb_node);
203         rb_insert_color(&st->rb, &thread_stats);
204
205         thread_stat_findnew = thread_stat_findnew_after_first;
206         return st;
207 }
208
209 /* build simple key function one is bigger than two */
210 #define SINGLE_KEY(member)                                              \
211         static int lock_stat_key_ ## member(struct lock_stat *one,      \
212                                          struct lock_stat *two)         \
213         {                                                               \
214                 return one->member > two->member;                       \
215         }
216
217 SINGLE_KEY(nr_acquired)
218 SINGLE_KEY(nr_contended)
219 SINGLE_KEY(avg_wait_time)
220 SINGLE_KEY(wait_time_total)
221 SINGLE_KEY(wait_time_max)
222
223 static int lock_stat_key_wait_time_min(struct lock_stat *one,
224                                         struct lock_stat *two)
225 {
226         u64 s1 = one->wait_time_min;
227         u64 s2 = two->wait_time_min;
228         if (s1 == ULLONG_MAX)
229                 s1 = 0;
230         if (s2 == ULLONG_MAX)
231                 s2 = 0;
232         return s1 > s2;
233 }
234
235 struct lock_key {
236         /*
237          * name: the value for specify by user
238          * this should be simpler than raw name of member
239          * e.g. nr_acquired -> acquired, wait_time_total -> wait_total
240          */
241         const char              *name;
242         int                     (*key)(struct lock_stat*, struct lock_stat*);
243 };
244
245 static const char               *sort_key = "acquired";
246
247 static int                      (*compare)(struct lock_stat *, struct lock_stat *);
248
249 static struct rb_root           result; /* place to store sorted data */
250
251 #define DEF_KEY_LOCK(name, fn_suffix)   \
252         { #name, lock_stat_key_ ## fn_suffix }
253 struct lock_key keys[] = {
254         DEF_KEY_LOCK(acquired, nr_acquired),
255         DEF_KEY_LOCK(contended, nr_contended),
256         DEF_KEY_LOCK(avg_wait, avg_wait_time),
257         DEF_KEY_LOCK(wait_total, wait_time_total),
258         DEF_KEY_LOCK(wait_min, wait_time_min),
259         DEF_KEY_LOCK(wait_max, wait_time_max),
260
261         /* extra comparisons much complicated should be here */
262
263         { NULL, NULL }
264 };
265
266 static int select_key(void)
267 {
268         int i;
269
270         for (i = 0; keys[i].name; i++) {
271                 if (!strcmp(keys[i].name, sort_key)) {
272                         compare = keys[i].key;
273                         return 0;
274                 }
275         }
276
277         pr_err("Unknown compare key: %s\n", sort_key);
278
279         return -1;
280 }
281
282 static void insert_to_result(struct lock_stat *st,
283                              int (*bigger)(struct lock_stat *, struct lock_stat *))
284 {
285         struct rb_node **rb = &result.rb_node;
286         struct rb_node *parent = NULL;
287         struct lock_stat *p;
288
289         while (*rb) {
290                 p = container_of(*rb, struct lock_stat, rb);
291                 parent = *rb;
292
293                 if (bigger(st, p))
294                         rb = &(*rb)->rb_left;
295                 else
296                         rb = &(*rb)->rb_right;
297         }
298
299         rb_link_node(&st->rb, parent, rb);
300         rb_insert_color(&st->rb, &result);
301 }
302
303 /* returns left most element of result, and erase it */
304 static struct lock_stat *pop_from_result(void)
305 {
306         struct rb_node *node = result.rb_node;
307
308         if (!node)
309                 return NULL;
310
311         while (node->rb_left)
312                 node = node->rb_left;
313
314         rb_erase(node, &result);
315         return container_of(node, struct lock_stat, rb);
316 }
317
318 static struct lock_stat *lock_stat_findnew(void *addr, const char *name)
319 {
320         struct list_head *entry = lockhashentry(addr);
321         struct lock_stat *ret, *new;
322
323         list_for_each_entry(ret, entry, hash_entry) {
324                 if (ret->addr == addr)
325                         return ret;
326         }
327
328         new = zalloc(sizeof(struct lock_stat));
329         if (!new)
330                 goto alloc_failed;
331
332         new->addr = addr;
333         new->name = zalloc(sizeof(char) * strlen(name) + 1);
334         if (!new->name) {
335                 free(new);
336                 goto alloc_failed;
337         }
338
339         strcpy(new->name, name);
340         new->wait_time_min = ULLONG_MAX;
341
342         list_add(&new->hash_entry, entry);
343         return new;
344
345 alloc_failed:
346         pr_err("memory allocation failed\n");
347         return NULL;
348 }
349
350 struct trace_lock_handler {
351         int (*acquire_event)(struct evsel *evsel,
352                              struct perf_sample *sample);
353
354         int (*acquired_event)(struct evsel *evsel,
355                               struct perf_sample *sample);
356
357         int (*contended_event)(struct evsel *evsel,
358                                struct perf_sample *sample);
359
360         int (*release_event)(struct evsel *evsel,
361                              struct perf_sample *sample);
362 };
363
364 static struct lock_seq_stat *get_seq(struct thread_stat *ts, void *addr)
365 {
366         struct lock_seq_stat *seq;
367
368         list_for_each_entry(seq, &ts->seq_list, list) {
369                 if (seq->addr == addr)
370                         return seq;
371         }
372
373         seq = zalloc(sizeof(struct lock_seq_stat));
374         if (!seq) {
375                 pr_err("memory allocation failed\n");
376                 return NULL;
377         }
378         seq->state = SEQ_STATE_UNINITIALIZED;
379         seq->addr = addr;
380
381         list_add(&seq->list, &ts->seq_list);
382         return seq;
383 }
384
385 enum broken_state {
386         BROKEN_ACQUIRE,
387         BROKEN_ACQUIRED,
388         BROKEN_CONTENDED,
389         BROKEN_RELEASE,
390         BROKEN_MAX,
391 };
392
393 static int bad_hist[BROKEN_MAX];
394
395 enum acquire_flags {
396         TRY_LOCK = 1,
397         READ_LOCK = 2,
398 };
399
400 static int report_lock_acquire_event(struct evsel *evsel,
401                                      struct perf_sample *sample)
402 {
403         void *addr;
404         struct lock_stat *ls;
405         struct thread_stat *ts;
406         struct lock_seq_stat *seq;
407         const char *name = evsel__strval(evsel, sample, "name");
408         u64 tmp  = evsel__intval(evsel, sample, "lockdep_addr");
409         int flag = evsel__intval(evsel, sample, "flags");
410
411         memcpy(&addr, &tmp, sizeof(void *));
412
413         ls = lock_stat_findnew(addr, name);
414         if (!ls)
415                 return -ENOMEM;
416         if (ls->discard)
417                 return 0;
418
419         ts = thread_stat_findnew(sample->tid);
420         if (!ts)
421                 return -ENOMEM;
422
423         seq = get_seq(ts, addr);
424         if (!seq)
425                 return -ENOMEM;
426
427         switch (seq->state) {
428         case SEQ_STATE_UNINITIALIZED:
429         case SEQ_STATE_RELEASED:
430                 if (!flag) {
431                         seq->state = SEQ_STATE_ACQUIRING;
432                 } else {
433                         if (flag & TRY_LOCK)
434                                 ls->nr_trylock++;
435                         if (flag & READ_LOCK)
436                                 ls->nr_readlock++;
437                         seq->state = SEQ_STATE_READ_ACQUIRED;
438                         seq->read_count = 1;
439                         ls->nr_acquired++;
440                 }
441                 break;
442         case SEQ_STATE_READ_ACQUIRED:
443                 if (flag & READ_LOCK) {
444                         seq->read_count++;
445                         ls->nr_acquired++;
446                         goto end;
447                 } else {
448                         goto broken;
449                 }
450                 break;
451         case SEQ_STATE_ACQUIRED:
452         case SEQ_STATE_ACQUIRING:
453         case SEQ_STATE_CONTENDED:
454 broken:
455                 /* broken lock sequence, discard it */
456                 ls->discard = 1;
457                 bad_hist[BROKEN_ACQUIRE]++;
458                 list_del_init(&seq->list);
459                 free(seq);
460                 goto end;
461         default:
462                 BUG_ON("Unknown state of lock sequence found!\n");
463                 break;
464         }
465
466         ls->nr_acquire++;
467         seq->prev_event_time = sample->time;
468 end:
469         return 0;
470 }
471
472 static int report_lock_acquired_event(struct evsel *evsel,
473                                       struct perf_sample *sample)
474 {
475         void *addr;
476         struct lock_stat *ls;
477         struct thread_stat *ts;
478         struct lock_seq_stat *seq;
479         u64 contended_term;
480         const char *name = evsel__strval(evsel, sample, "name");
481         u64 tmp = evsel__intval(evsel, sample, "lockdep_addr");
482
483         memcpy(&addr, &tmp, sizeof(void *));
484
485         ls = lock_stat_findnew(addr, name);
486         if (!ls)
487                 return -ENOMEM;
488         if (ls->discard)
489                 return 0;
490
491         ts = thread_stat_findnew(sample->tid);
492         if (!ts)
493                 return -ENOMEM;
494
495         seq = get_seq(ts, addr);
496         if (!seq)
497                 return -ENOMEM;
498
499         switch (seq->state) {
500         case SEQ_STATE_UNINITIALIZED:
501                 /* orphan event, do nothing */
502                 return 0;
503         case SEQ_STATE_ACQUIRING:
504                 break;
505         case SEQ_STATE_CONTENDED:
506                 contended_term = sample->time - seq->prev_event_time;
507                 ls->wait_time_total += contended_term;
508                 if (contended_term < ls->wait_time_min)
509                         ls->wait_time_min = contended_term;
510                 if (ls->wait_time_max < contended_term)
511                         ls->wait_time_max = contended_term;
512                 break;
513         case SEQ_STATE_RELEASED:
514         case SEQ_STATE_ACQUIRED:
515         case SEQ_STATE_READ_ACQUIRED:
516                 /* broken lock sequence, discard it */
517                 ls->discard = 1;
518                 bad_hist[BROKEN_ACQUIRED]++;
519                 list_del_init(&seq->list);
520                 free(seq);
521                 goto end;
522         default:
523                 BUG_ON("Unknown state of lock sequence found!\n");
524                 break;
525         }
526
527         seq->state = SEQ_STATE_ACQUIRED;
528         ls->nr_acquired++;
529         ls->avg_wait_time = ls->nr_contended ? ls->wait_time_total/ls->nr_contended : 0;
530         seq->prev_event_time = sample->time;
531 end:
532         return 0;
533 }
534
535 static int report_lock_contended_event(struct evsel *evsel,
536                                        struct perf_sample *sample)
537 {
538         void *addr;
539         struct lock_stat *ls;
540         struct thread_stat *ts;
541         struct lock_seq_stat *seq;
542         const char *name = evsel__strval(evsel, sample, "name");
543         u64 tmp = evsel__intval(evsel, sample, "lockdep_addr");
544
545         memcpy(&addr, &tmp, sizeof(void *));
546
547         ls = lock_stat_findnew(addr, name);
548         if (!ls)
549                 return -ENOMEM;
550         if (ls->discard)
551                 return 0;
552
553         ts = thread_stat_findnew(sample->tid);
554         if (!ts)
555                 return -ENOMEM;
556
557         seq = get_seq(ts, addr);
558         if (!seq)
559                 return -ENOMEM;
560
561         switch (seq->state) {
562         case SEQ_STATE_UNINITIALIZED:
563                 /* orphan event, do nothing */
564                 return 0;
565         case SEQ_STATE_ACQUIRING:
566                 break;
567         case SEQ_STATE_RELEASED:
568         case SEQ_STATE_ACQUIRED:
569         case SEQ_STATE_READ_ACQUIRED:
570         case SEQ_STATE_CONTENDED:
571                 /* broken lock sequence, discard it */
572                 ls->discard = 1;
573                 bad_hist[BROKEN_CONTENDED]++;
574                 list_del_init(&seq->list);
575                 free(seq);
576                 goto end;
577         default:
578                 BUG_ON("Unknown state of lock sequence found!\n");
579                 break;
580         }
581
582         seq->state = SEQ_STATE_CONTENDED;
583         ls->nr_contended++;
584         ls->avg_wait_time = ls->wait_time_total/ls->nr_contended;
585         seq->prev_event_time = sample->time;
586 end:
587         return 0;
588 }
589
590 static int report_lock_release_event(struct evsel *evsel,
591                                      struct perf_sample *sample)
592 {
593         void *addr;
594         struct lock_stat *ls;
595         struct thread_stat *ts;
596         struct lock_seq_stat *seq;
597         const char *name = evsel__strval(evsel, sample, "name");
598         u64 tmp = evsel__intval(evsel, sample, "lockdep_addr");
599
600         memcpy(&addr, &tmp, sizeof(void *));
601
602         ls = lock_stat_findnew(addr, name);
603         if (!ls)
604                 return -ENOMEM;
605         if (ls->discard)
606                 return 0;
607
608         ts = thread_stat_findnew(sample->tid);
609         if (!ts)
610                 return -ENOMEM;
611
612         seq = get_seq(ts, addr);
613         if (!seq)
614                 return -ENOMEM;
615
616         switch (seq->state) {
617         case SEQ_STATE_UNINITIALIZED:
618                 goto end;
619         case SEQ_STATE_ACQUIRED:
620                 break;
621         case SEQ_STATE_READ_ACQUIRED:
622                 seq->read_count--;
623                 BUG_ON(seq->read_count < 0);
624                 if (seq->read_count) {
625                         ls->nr_release++;
626                         goto end;
627                 }
628                 break;
629         case SEQ_STATE_ACQUIRING:
630         case SEQ_STATE_CONTENDED:
631         case SEQ_STATE_RELEASED:
632                 /* broken lock sequence, discard it */
633                 ls->discard = 1;
634                 bad_hist[BROKEN_RELEASE]++;
635                 goto free_seq;
636         default:
637                 BUG_ON("Unknown state of lock sequence found!\n");
638                 break;
639         }
640
641         ls->nr_release++;
642 free_seq:
643         list_del_init(&seq->list);
644         free(seq);
645 end:
646         return 0;
647 }
648
649 /* lock oriented handlers */
650 /* TODO: handlers for CPU oriented, thread oriented */
651 static struct trace_lock_handler report_lock_ops  = {
652         .acquire_event          = report_lock_acquire_event,
653         .acquired_event         = report_lock_acquired_event,
654         .contended_event        = report_lock_contended_event,
655         .release_event          = report_lock_release_event,
656 };
657
658 static struct trace_lock_handler *trace_handler;
659
660 static int evsel__process_lock_acquire(struct evsel *evsel, struct perf_sample *sample)
661 {
662         if (trace_handler->acquire_event)
663                 return trace_handler->acquire_event(evsel, sample);
664         return 0;
665 }
666
667 static int evsel__process_lock_acquired(struct evsel *evsel, struct perf_sample *sample)
668 {
669         if (trace_handler->acquired_event)
670                 return trace_handler->acquired_event(evsel, sample);
671         return 0;
672 }
673
674 static int evsel__process_lock_contended(struct evsel *evsel, struct perf_sample *sample)
675 {
676         if (trace_handler->contended_event)
677                 return trace_handler->contended_event(evsel, sample);
678         return 0;
679 }
680
681 static int evsel__process_lock_release(struct evsel *evsel, struct perf_sample *sample)
682 {
683         if (trace_handler->release_event)
684                 return trace_handler->release_event(evsel, sample);
685         return 0;
686 }
687
688 static void print_bad_events(int bad, int total)
689 {
690         /* Output for debug, this have to be removed */
691         int i;
692         const char *name[4] =
693                 { "acquire", "acquired", "contended", "release" };
694
695         pr_info("\n=== output for debug===\n\n");
696         pr_info("bad: %d, total: %d\n", bad, total);
697         pr_info("bad rate: %.2f %%\n", (double)bad / (double)total * 100);
698         pr_info("histogram of events caused bad sequence\n");
699         for (i = 0; i < BROKEN_MAX; i++)
700                 pr_info(" %10s: %d\n", name[i], bad_hist[i]);
701 }
702
703 /* TODO: various way to print, coloring, nano or milli sec */
704 static void print_result(void)
705 {
706         struct lock_stat *st;
707         char cut_name[20];
708         int bad, total;
709
710         pr_info("%20s ", "Name");
711         pr_info("%10s ", "acquired");
712         pr_info("%10s ", "contended");
713
714         pr_info("%15s ", "avg wait (ns)");
715         pr_info("%15s ", "total wait (ns)");
716         pr_info("%15s ", "max wait (ns)");
717         pr_info("%15s ", "min wait (ns)");
718
719         pr_info("\n\n");
720
721         bad = total = 0;
722         while ((st = pop_from_result())) {
723                 total++;
724                 if (st->discard) {
725                         bad++;
726                         continue;
727                 }
728                 bzero(cut_name, 20);
729
730                 if (strlen(st->name) < 16) {
731                         /* output raw name */
732                         pr_info("%20s ", st->name);
733                 } else {
734                         strncpy(cut_name, st->name, 16);
735                         cut_name[16] = '.';
736                         cut_name[17] = '.';
737                         cut_name[18] = '.';
738                         cut_name[19] = '\0';
739                         /* cut off name for saving output style */
740                         pr_info("%20s ", cut_name);
741                 }
742
743                 pr_info("%10u ", st->nr_acquired);
744                 pr_info("%10u ", st->nr_contended);
745
746                 pr_info("%15" PRIu64 " ", st->avg_wait_time);
747                 pr_info("%15" PRIu64 " ", st->wait_time_total);
748                 pr_info("%15" PRIu64 " ", st->wait_time_max);
749                 pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
750                        0 : st->wait_time_min);
751                 pr_info("\n");
752         }
753
754         print_bad_events(bad, total);
755 }
756
757 static bool info_threads, info_map;
758
759 static void dump_threads(void)
760 {
761         struct thread_stat *st;
762         struct rb_node *node;
763         struct thread *t;
764
765         pr_info("%10s: comm\n", "Thread ID");
766
767         node = rb_first(&thread_stats);
768         while (node) {
769                 st = container_of(node, struct thread_stat, rb);
770                 t = perf_session__findnew(session, st->tid);
771                 pr_info("%10d: %s\n", st->tid, thread__comm_str(t));
772                 node = rb_next(node);
773                 thread__put(t);
774         }
775 }
776
777 static void dump_map(void)
778 {
779         unsigned int i;
780         struct lock_stat *st;
781
782         pr_info("Address of instance: name of class\n");
783         for (i = 0; i < LOCKHASH_SIZE; i++) {
784                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
785                         pr_info(" %p: %s\n", st->addr, st->name);
786                 }
787         }
788 }
789
790 static int dump_info(void)
791 {
792         int rc = 0;
793
794         if (info_threads)
795                 dump_threads();
796         else if (info_map)
797                 dump_map();
798         else {
799                 rc = -1;
800                 pr_err("Unknown type of information\n");
801         }
802
803         return rc;
804 }
805
806 typedef int (*tracepoint_handler)(struct evsel *evsel,
807                                   struct perf_sample *sample);
808
809 static int process_sample_event(struct perf_tool *tool __maybe_unused,
810                                 union perf_event *event,
811                                 struct perf_sample *sample,
812                                 struct evsel *evsel,
813                                 struct machine *machine)
814 {
815         int err = 0;
816         struct thread *thread = machine__findnew_thread(machine, sample->pid,
817                                                         sample->tid);
818
819         if (thread == NULL) {
820                 pr_debug("problem processing %d event, skipping it.\n",
821                         event->header.type);
822                 return -1;
823         }
824
825         if (evsel->handler != NULL) {
826                 tracepoint_handler f = evsel->handler;
827                 err = f(evsel, sample);
828         }
829
830         thread__put(thread);
831
832         return err;
833 }
834
835 static void sort_result(void)
836 {
837         unsigned int i;
838         struct lock_stat *st;
839
840         for (i = 0; i < LOCKHASH_SIZE; i++) {
841                 list_for_each_entry(st, &lockhash_table[i], hash_entry) {
842                         insert_to_result(st, compare);
843                 }
844         }
845 }
846
847 static const struct evsel_str_handler lock_tracepoints[] = {
848         { "lock:lock_acquire",   evsel__process_lock_acquire,   }, /* CONFIG_LOCKDEP */
849         { "lock:lock_acquired",  evsel__process_lock_acquired,  }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
850         { "lock:lock_contended", evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
851         { "lock:lock_release",   evsel__process_lock_release,   }, /* CONFIG_LOCKDEP */
852 };
853
854 static bool force;
855
856 static int __cmd_report(bool display_info)
857 {
858         int err = -EINVAL;
859         struct perf_tool eops = {
860                 .sample          = process_sample_event,
861                 .comm            = perf_event__process_comm,
862                 .namespaces      = perf_event__process_namespaces,
863                 .ordered_events  = true,
864         };
865         struct perf_data data = {
866                 .path  = input_name,
867                 .mode  = PERF_DATA_MODE_READ,
868                 .force = force,
869         };
870
871         session = perf_session__new(&data, false, &eops);
872         if (IS_ERR(session)) {
873                 pr_err("Initializing perf session failed\n");
874                 return PTR_ERR(session);
875         }
876
877         symbol__init(&session->header.env);
878
879         if (!perf_session__has_traces(session, "lock record"))
880                 goto out_delete;
881
882         if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
883                 pr_err("Initializing perf session tracepoint handlers failed\n");
884                 goto out_delete;
885         }
886
887         if (select_key())
888                 goto out_delete;
889
890         err = perf_session__process_events(session);
891         if (err)
892                 goto out_delete;
893
894         setup_pager();
895         if (display_info) /* used for info subcommand */
896                 err = dump_info();
897         else {
898                 sort_result();
899                 print_result();
900         }
901
902 out_delete:
903         perf_session__delete(session);
904         return err;
905 }
906
907 static int __cmd_record(int argc, const char **argv)
908 {
909         const char *record_args[] = {
910                 "record", "-R", "-m", "1024", "-c", "1",
911         };
912         unsigned int rec_argc, i, j, ret;
913         const char **rec_argv;
914
915         for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
916                 if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
917                                 pr_err("tracepoint %s is not enabled. "
918                                        "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
919                                        lock_tracepoints[i].name);
920                                 return 1;
921                 }
922         }
923
924         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
925         /* factor of 2 is for -e in front of each tracepoint */
926         rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
927
928         rec_argv = calloc(rec_argc + 1, sizeof(char *));
929         if (!rec_argv)
930                 return -ENOMEM;
931
932         for (i = 0; i < ARRAY_SIZE(record_args); i++)
933                 rec_argv[i] = strdup(record_args[i]);
934
935         for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
936                 rec_argv[i++] = "-e";
937                 rec_argv[i++] = strdup(lock_tracepoints[j].name);
938         }
939
940         for (j = 1; j < (unsigned int)argc; j++, i++)
941                 rec_argv[i] = argv[j];
942
943         BUG_ON(i != rec_argc);
944
945         ret = cmd_record(i, rec_argv);
946         free(rec_argv);
947         return ret;
948 }
949
950 int cmd_lock(int argc, const char **argv)
951 {
952         const struct option lock_options[] = {
953         OPT_STRING('i', "input", &input_name, "file", "input file name"),
954         OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
955         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
956         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
957         OPT_END()
958         };
959
960         const struct option info_options[] = {
961         OPT_BOOLEAN('t', "threads", &info_threads,
962                     "dump thread list in perf.data"),
963         OPT_BOOLEAN('m', "map", &info_map,
964                     "map of lock instances (address:name table)"),
965         OPT_PARENT(lock_options)
966         };
967
968         const struct option report_options[] = {
969         OPT_STRING('k', "key", &sort_key, "acquired",
970                     "key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"),
971         /* TODO: type */
972         OPT_PARENT(lock_options)
973         };
974
975         const char * const info_usage[] = {
976                 "perf lock info [<options>]",
977                 NULL
978         };
979         const char *const lock_subcommands[] = { "record", "report", "script",
980                                                  "info", NULL };
981         const char *lock_usage[] = {
982                 NULL,
983                 NULL
984         };
985         const char * const report_usage[] = {
986                 "perf lock report [<options>]",
987                 NULL
988         };
989         unsigned int i;
990         int rc = 0;
991
992         for (i = 0; i < LOCKHASH_SIZE; i++)
993                 INIT_LIST_HEAD(lockhash_table + i);
994
995         argc = parse_options_subcommand(argc, argv, lock_options, lock_subcommands,
996                                         lock_usage, PARSE_OPT_STOP_AT_NON_OPTION);
997         if (!argc)
998                 usage_with_options(lock_usage, lock_options);
999
1000         if (!strncmp(argv[0], "rec", 3)) {
1001                 return __cmd_record(argc, argv);
1002         } else if (!strncmp(argv[0], "report", 6)) {
1003                 trace_handler = &report_lock_ops;
1004                 if (argc) {
1005                         argc = parse_options(argc, argv,
1006                                              report_options, report_usage, 0);
1007                         if (argc)
1008                                 usage_with_options(report_usage, report_options);
1009                 }
1010                 rc = __cmd_report(false);
1011         } else if (!strcmp(argv[0], "script")) {
1012                 /* Aliased to 'perf script' */
1013                 return cmd_script(argc, argv);
1014         } else if (!strcmp(argv[0], "info")) {
1015                 if (argc) {
1016                         argc = parse_options(argc, argv,
1017                                              info_options, info_usage, 0);
1018                         if (argc)
1019                                 usage_with_options(info_usage, info_options);
1020                 }
1021                 /* recycling report_lock_ops */
1022                 trace_handler = &report_lock_ops;
1023                 rc = __cmd_report(true);
1024         } else {
1025                 usage_with_options(lock_usage, lock_options);
1026         }
1027
1028         return rc;
1029 }