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Merge branch 'vsock-virtio'
[linux/fpc-iii.git] / kernel / locking / lockdep_proc.c
blobd83d798bef95a042e1060a35bf4b79e7c7a6c05c
1 /*
2 * kernel/lockdep_proc.c
3 *
4 * Runtime locking correctness validator
5 *
6 * Started by Ingo Molnar:
7 *
8 * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
9 * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
10 *
11 * Code for /proc/lockdep and /proc/lockdep_stats:
12 *
13 */
14 #include <linux/export.h>
15 #include <linux/proc_fs.h>
16 #include <linux/seq_file.h>
17 #include <linux/kallsyms.h>
18 #include <linux/debug_locks.h>
19 #include <linux/vmalloc.h>
20 #include <linux/sort.h>
21 #include <asm/uaccess.h>
22 #include <asm/div64.h>
23
24 #include "lockdep_internals.h"
25
26 static void *l_next(struct seq_file *m, void *v, loff_t *pos)
27 {
28 return seq_list_next(v, &all_lock_classes, pos);
29 }
30
31 static void *l_start(struct seq_file *m, loff_t *pos)
32 {
33 return seq_list_start_head(&all_lock_classes, *pos);
34 }
35
36 static void l_stop(struct seq_file *m, void *v)
37 {
38 }
39
40 static void print_name(struct seq_file *m, struct lock_class *class)
41 {
42 char str[KSYM_NAME_LEN];
43 const char *name = class->name;
44
45 if (!name) {
46 name = __get_key_name(class->key, str);
47 seq_printf(m, "%s", name);
48 } else{
49 seq_printf(m, "%s", name);
50 if (class->name_version > 1)
51 seq_printf(m, "#%d", class->name_version);
52 if (class->subclass)
53 seq_printf(m, "/%d", class->subclass);
54 }
55 }
56
57 static int l_show(struct seq_file *m, void *v)
58 {
59 struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
60 struct lock_list *entry;
61 char usage[LOCK_USAGE_CHARS];
62
63 if (v == &all_lock_classes) {
64 seq_printf(m, "all lock classes:\n");
65 return 0;
66 }
67
68 seq_printf(m, "%p", class->key);
69 #ifdef CONFIG_DEBUG_LOCKDEP
70 seq_printf(m, " OPS:%8ld", class->ops);
71 #endif
72 #ifdef CONFIG_PROVE_LOCKING
73 seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
74 seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
75 #endif
76
77 get_usage_chars(class, usage);
78 seq_printf(m, " %s", usage);
79
80 seq_printf(m, ": ");
81 print_name(m, class);
82 seq_puts(m, "\n");
83
84 list_for_each_entry(entry, &class->locks_after, entry) {
85 if (entry->distance == 1) {
86 seq_printf(m, " -> [%p] ", entry->class->key);
87 print_name(m, entry->class);
88 seq_puts(m, "\n");
89 }
90 }
91 seq_puts(m, "\n");
92
93 return 0;
94 }
95
96 static const struct seq_operations lockdep_ops = {
97 .start = l_start,
98 .next = l_next,
99 .stop = l_stop,
100 .show = l_show,
101 };
102
103 static int lockdep_open(struct inode *inode, struct file *file)
104 {
105 return seq_open(file, &lockdep_ops);
106 }
107
108 static const struct file_operations proc_lockdep_operations = {
109 .open = lockdep_open,
110 .read = seq_read,
111 .llseek = seq_lseek,
112 .release = seq_release,
113 };
114
115 #ifdef CONFIG_PROVE_LOCKING
116 static void *lc_start(struct seq_file *m, loff_t *pos)
117 {
118 if (*pos == 0)
119 return SEQ_START_TOKEN;
120
121 if (*pos - 1 < nr_lock_chains)
122 return lock_chains + (*pos - 1);
123
124 return NULL;
125 }
126
127 static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
128 {
129 (*pos)++;
130 return lc_start(m, pos);
131 }
132
133 static void lc_stop(struct seq_file *m, void *v)
134 {
135 }
136
137 static int lc_show(struct seq_file *m, void *v)
138 {
139 struct lock_chain *chain = v;
140 struct lock_class *class;
141 int i;
142
143 if (v == SEQ_START_TOKEN) {
144 seq_printf(m, "all lock chains:\n");
145 return 0;
146 }
147
148 seq_printf(m, "irq_context: %d\n", chain->irq_context);
149
150 for (i = 0; i < chain->depth; i++) {
151 class = lock_chain_get_class(chain, i);
152 if (!class->key)
153 continue;
154
155 seq_printf(m, "[%p] ", class->key);
156 print_name(m, class);
157 seq_puts(m, "\n");
158 }
159 seq_puts(m, "\n");
160
161 return 0;
162 }
163
164 static const struct seq_operations lockdep_chains_ops = {
165 .start = lc_start,
166 .next = lc_next,
167 .stop = lc_stop,
168 .show = lc_show,
169 };
170
171 static int lockdep_chains_open(struct inode *inode, struct file *file)
172 {
173 return seq_open(file, &lockdep_chains_ops);
174 }
175
176 static const struct file_operations proc_lockdep_chains_operations = {
177 .open = lockdep_chains_open,
178 .read = seq_read,
179 .llseek = seq_lseek,
180 .release = seq_release,
181 };
182 #endif /* CONFIG_PROVE_LOCKING */
183
184 static void lockdep_stats_debug_show(struct seq_file *m)
185 {
186 #ifdef CONFIG_DEBUG_LOCKDEP
187 unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
188 hi2 = debug_atomic_read(hardirqs_off_events),
189 hr1 = debug_atomic_read(redundant_hardirqs_on),
190 hr2 = debug_atomic_read(redundant_hardirqs_off),
191 si1 = debug_atomic_read(softirqs_on_events),
192 si2 = debug_atomic_read(softirqs_off_events),
193 sr1 = debug_atomic_read(redundant_softirqs_on),
194 sr2 = debug_atomic_read(redundant_softirqs_off);
195
196 seq_printf(m, " chain lookup misses: %11llu\n",
197 debug_atomic_read(chain_lookup_misses));
198 seq_printf(m, " chain lookup hits: %11llu\n",
199 debug_atomic_read(chain_lookup_hits));
200 seq_printf(m, " cyclic checks: %11llu\n",
201 debug_atomic_read(nr_cyclic_checks));
202 seq_printf(m, " find-mask forwards checks: %11llu\n",
203 debug_atomic_read(nr_find_usage_forwards_checks));
204 seq_printf(m, " find-mask backwards checks: %11llu\n",
205 debug_atomic_read(nr_find_usage_backwards_checks));
206
207 seq_printf(m, " hardirq on events: %11llu\n", hi1);
208 seq_printf(m, " hardirq off events: %11llu\n", hi2);
209 seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
210 seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
211 seq_printf(m, " softirq on events: %11llu\n", si1);
212 seq_printf(m, " softirq off events: %11llu\n", si2);
213 seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
214 seq_printf(m, " redundant softirq offs: %11llu\n", sr2);
215 #endif
216 }
217
218 static int lockdep_stats_show(struct seq_file *m, void *v)
219 {
220 struct lock_class *class;
221 unsigned long nr_unused = 0, nr_uncategorized = 0,
222 nr_irq_safe = 0, nr_irq_unsafe = 0,
223 nr_softirq_safe = 0, nr_softirq_unsafe = 0,
224 nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
225 nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
226 nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
227 nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
228 sum_forward_deps = 0;
229
230 list_for_each_entry(class, &all_lock_classes, lock_entry) {
231
232 if (class->usage_mask == 0)
233 nr_unused++;
234 if (class->usage_mask == LOCKF_USED)
235 nr_uncategorized++;
236 if (class->usage_mask & LOCKF_USED_IN_IRQ)
237 nr_irq_safe++;
238 if (class->usage_mask & LOCKF_ENABLED_IRQ)
239 nr_irq_unsafe++;
240 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
241 nr_softirq_safe++;
242 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
243 nr_softirq_unsafe++;
244 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
245 nr_hardirq_safe++;
246 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
247 nr_hardirq_unsafe++;
248 if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
249 nr_irq_read_safe++;
250 if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
251 nr_irq_read_unsafe++;
252 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
253 nr_softirq_read_safe++;
254 if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
255 nr_softirq_read_unsafe++;
256 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
257 nr_hardirq_read_safe++;
258 if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
259 nr_hardirq_read_unsafe++;
260
261 #ifdef CONFIG_PROVE_LOCKING
262 sum_forward_deps += lockdep_count_forward_deps(class);
263 #endif
264 }
265 #ifdef CONFIG_DEBUG_LOCKDEP
266 DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
267 #endif
268 seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
269 nr_lock_classes, MAX_LOCKDEP_KEYS);
270 seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
271 nr_list_entries, MAX_LOCKDEP_ENTRIES);
272 seq_printf(m, " indirect dependencies: %11lu\n",
273 sum_forward_deps);
274
275 /*
276 * Total number of dependencies:
277 *
278 * All irq-safe locks may nest inside irq-unsafe locks,
279 * plus all the other known dependencies:
280 */
281 seq_printf(m, " all direct dependencies: %11lu\n",
282 nr_irq_unsafe * nr_irq_safe +
283 nr_hardirq_unsafe * nr_hardirq_safe +
284 nr_list_entries);
285
286 #ifdef CONFIG_PROVE_LOCKING
287 seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
288 nr_lock_chains, MAX_LOCKDEP_CHAINS);
289 seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
290 nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
291 #endif
292
293 #ifdef CONFIG_TRACE_IRQFLAGS
294 seq_printf(m, " in-hardirq chains: %11u\n",
295 nr_hardirq_chains);
296 seq_printf(m, " in-softirq chains: %11u\n",
297 nr_softirq_chains);
298 #endif
299 seq_printf(m, " in-process chains: %11u\n",
300 nr_process_chains);
301 seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
302 nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
303 seq_printf(m, " combined max dependencies: %11u\n",
304 (nr_hardirq_chains + 1) *
305 (nr_softirq_chains + 1) *
306 (nr_process_chains + 1)
307 );
308 seq_printf(m, " hardirq-safe locks: %11lu\n",
309 nr_hardirq_safe);
310 seq_printf(m, " hardirq-unsafe locks: %11lu\n",
311 nr_hardirq_unsafe);
312 seq_printf(m, " softirq-safe locks: %11lu\n",
313 nr_softirq_safe);
314 seq_printf(m, " softirq-unsafe locks: %11lu\n",
315 nr_softirq_unsafe);
316 seq_printf(m, " irq-safe locks: %11lu\n",
317 nr_irq_safe);
318 seq_printf(m, " irq-unsafe locks: %11lu\n",
319 nr_irq_unsafe);
320
321 seq_printf(m, " hardirq-read-safe locks: %11lu\n",
322 nr_hardirq_read_safe);
323 seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
324 nr_hardirq_read_unsafe);
325 seq_printf(m, " softirq-read-safe locks: %11lu\n",
326 nr_softirq_read_safe);
327 seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
328 nr_softirq_read_unsafe);
329 seq_printf(m, " irq-read-safe locks: %11lu\n",
330 nr_irq_read_safe);
331 seq_printf(m, " irq-read-unsafe locks: %11lu\n",
332 nr_irq_read_unsafe);
333
334 seq_printf(m, " uncategorized locks: %11lu\n",
335 nr_uncategorized);
336 seq_printf(m, " unused locks: %11lu\n",
337 nr_unused);
338 seq_printf(m, " max locking depth: %11u\n",
339 max_lockdep_depth);
340 #ifdef CONFIG_PROVE_LOCKING
341 seq_printf(m, " max bfs queue depth: %11u\n",
342 max_bfs_queue_depth);
343 #endif
344 lockdep_stats_debug_show(m);
345 seq_printf(m, " debug_locks: %11u\n",
346 debug_locks);
347
348 return 0;
349 }
350
351 static int lockdep_stats_open(struct inode *inode, struct file *file)
352 {
353 return single_open(file, lockdep_stats_show, NULL);
354 }
355
356 static const struct file_operations proc_lockdep_stats_operations = {
357 .open = lockdep_stats_open,
358 .read = seq_read,
359 .llseek = seq_lseek,
360 .release = single_release,
361 };
362
363 #ifdef CONFIG_LOCK_STAT
364
365 struct lock_stat_data {
366 struct lock_class *class;
367 struct lock_class_stats stats;
368 };
369
370 struct lock_stat_seq {
371 struct lock_stat_data *iter_end;
372 struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
373 };
374
375 /*
376 * sort on absolute number of contentions
377 */
378 static int lock_stat_cmp(const void *l, const void *r)
379 {
380 const struct lock_stat_data *dl = l, *dr = r;
381 unsigned long nl, nr;
382
383 nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
384 nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
385
386 return nr - nl;
387 }
388
389 static void seq_line(struct seq_file *m, char c, int offset, int length)
390 {
391 int i;
392
393 for (i = 0; i < offset; i++)
394 seq_puts(m, " ");
395 for (i = 0; i < length; i++)
396 seq_printf(m, "%c", c);
397 seq_puts(m, "\n");
398 }
399
400 static void snprint_time(char *buf, size_t bufsiz, s64 nr)
401 {
402 s64 div;
403 s32 rem;
404
405 nr += 5; /* for display rounding */
406 div = div_s64_rem(nr, 1000, &rem);
407 snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
408 }
409
410 static void seq_time(struct seq_file *m, s64 time)
411 {
412 char num[15];
413
414 snprint_time(num, sizeof(num), time);
415 seq_printf(m, " %14s", num);
416 }
417
418 static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
419 {
420 seq_printf(m, "%14lu", lt->nr);
421 seq_time(m, lt->min);
422 seq_time(m, lt->max);
423 seq_time(m, lt->total);
424 seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
425 }
426
427 static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
428 {
429 struct lockdep_subclass_key *ckey;
430 struct lock_class_stats *stats;
431 struct lock_class *class;
432 const char *cname;
433 int i, namelen;
434 char name[39];
435
436 class = data->class;
437 stats = &data->stats;
438
439 namelen = 38;
440 if (class->name_version > 1)
441 namelen -= 2; /* XXX truncates versions > 9 */
442 if (class->subclass)
443 namelen -= 2;
444
445 rcu_read_lock_sched();
446 cname = rcu_dereference_sched(class->name);
447 ckey = rcu_dereference_sched(class->key);
448
449 if (!cname && !ckey) {
450 rcu_read_unlock_sched();
451 return;
452
453 } else if (!cname) {
454 char str[KSYM_NAME_LEN];
455 const char *key_name;
456
457 key_name = __get_key_name(ckey, str);
458 snprintf(name, namelen, "%s", key_name);
459 } else {
460 snprintf(name, namelen, "%s", cname);
461 }
462 rcu_read_unlock_sched();
463
464 namelen = strlen(name);
465 if (class->name_version > 1) {
466 snprintf(name+namelen, 3, "#%d", class->name_version);
467 namelen += 2;
468 }
469 if (class->subclass) {
470 snprintf(name+namelen, 3, "/%d", class->subclass);
471 namelen += 2;
472 }
473
474 if (stats->write_holdtime.nr) {
475 if (stats->read_holdtime.nr)
476 seq_printf(m, "%38s-W:", name);
477 else
478 seq_printf(m, "%40s:", name);
479
480 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
481 seq_lock_time(m, &stats->write_waittime);
482 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
483 seq_lock_time(m, &stats->write_holdtime);
484 seq_puts(m, "\n");
485 }
486
487 if (stats->read_holdtime.nr) {
488 seq_printf(m, "%38s-R:", name);
489 seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
490 seq_lock_time(m, &stats->read_waittime);
491 seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
492 seq_lock_time(m, &stats->read_holdtime);
493 seq_puts(m, "\n");
494 }
495
496 if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
497 return;
498
499 if (stats->read_holdtime.nr)
500 namelen += 2;
501
502 for (i = 0; i < LOCKSTAT_POINTS; i++) {
503 char ip[32];
504
505 if (class->contention_point[i] == 0)
506 break;
507
508 if (!i)
509 seq_line(m, '-', 40-namelen, namelen);
510
511 snprintf(ip, sizeof(ip), "[<%p>]",
512 (void *)class->contention_point[i]);
513 seq_printf(m, "%40s %14lu %29s %pS\n",
514 name, stats->contention_point[i],
515 ip, (void *)class->contention_point[i]);
516 }
517 for (i = 0; i < LOCKSTAT_POINTS; i++) {
518 char ip[32];
519
520 if (class->contending_point[i] == 0)
521 break;
522
523 if (!i)
524 seq_line(m, '-', 40-namelen, namelen);
525
526 snprintf(ip, sizeof(ip), "[<%p>]",
527 (void *)class->contending_point[i]);
528 seq_printf(m, "%40s %14lu %29s %pS\n",
529 name, stats->contending_point[i],
530 ip, (void *)class->contending_point[i]);
531 }
532 if (i) {
533 seq_puts(m, "\n");
534 seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
535 seq_puts(m, "\n");
536 }
537 }
538
539 static void seq_header(struct seq_file *m)
540 {
541 seq_puts(m, "lock_stat version 0.4\n");
542
543 if (unlikely(!debug_locks))
544 seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
545
546 seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
547 seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
548 "%14s %14s\n",
549 "class name",
550 "con-bounces",
551 "contentions",
552 "waittime-min",
553 "waittime-max",
554 "waittime-total",
555 "waittime-avg",
556 "acq-bounces",
557 "acquisitions",
558 "holdtime-min",
559 "holdtime-max",
560 "holdtime-total",
561 "holdtime-avg");
562 seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
563 seq_printf(m, "\n");
564 }
565
566 static void *ls_start(struct seq_file *m, loff_t *pos)
567 {
568 struct lock_stat_seq *data = m->private;
569 struct lock_stat_data *iter;
570
571 if (*pos == 0)
572 return SEQ_START_TOKEN;
573
574 iter = data->stats + (*pos - 1);
575 if (iter >= data->iter_end)
576 iter = NULL;
577
578 return iter;
579 }
580
581 static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
582 {
583 (*pos)++;
584 return ls_start(m, pos);
585 }
586
587 static void ls_stop(struct seq_file *m, void *v)
588 {
589 }
590
591 static int ls_show(struct seq_file *m, void *v)
592 {
593 if (v == SEQ_START_TOKEN)
594 seq_header(m);
595 else
596 seq_stats(m, v);
597
598 return 0;
599 }
600
601 static const struct seq_operations lockstat_ops = {
602 .start = ls_start,
603 .next = ls_next,
604 .stop = ls_stop,
605 .show = ls_show,
606 };
607
608 static int lock_stat_open(struct inode *inode, struct file *file)
609 {
610 int res;
611 struct lock_class *class;
612 struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
613
614 if (!data)
615 return -ENOMEM;
616
617 res = seq_open(file, &lockstat_ops);
618 if (!res) {
619 struct lock_stat_data *iter = data->stats;
620 struct seq_file *m = file->private_data;
621
622 list_for_each_entry(class, &all_lock_classes, lock_entry) {
623 iter->class = class;
624 iter->stats = lock_stats(class);
625 iter++;
626 }
627 data->iter_end = iter;
628
629 sort(data->stats, data->iter_end - data->stats,
630 sizeof(struct lock_stat_data),
631 lock_stat_cmp, NULL);
632
633 m->private = data;
634 } else
635 vfree(data);
636
637 return res;
638 }
639
640 static ssize_t lock_stat_write(struct file *file, const char __user *buf,
641 size_t count, loff_t *ppos)
642 {
643 struct lock_class *class;
644 char c;
645
646 if (count) {
647 if (get_user(c, buf))
648 return -EFAULT;
649
650 if (c != '0')
651 return count;
652
653 list_for_each_entry(class, &all_lock_classes, lock_entry)
654 clear_lock_stats(class);
655 }
656 return count;
657 }
658
659 static int lock_stat_release(struct inode *inode, struct file *file)
660 {
661 struct seq_file *seq = file->private_data;
662
663 vfree(seq->private);
664 return seq_release(inode, file);
665 }
666
667 static const struct file_operations proc_lock_stat_operations = {
668 .open = lock_stat_open,
669 .write = lock_stat_write,
670 .read = seq_read,
671 .llseek = seq_lseek,
672 .release = lock_stat_release,
673 };
674 #endif /* CONFIG_LOCK_STAT */
675
676 static int __init lockdep_proc_init(void)
677 {
678 proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
679 #ifdef CONFIG_PROVE_LOCKING
680 proc_create("lockdep_chains", S_IRUSR, NULL,
681 &proc_lockdep_chains_operations);
682 #endif
683 proc_create("lockdep_stats", S_IRUSR, NULL,
684 &proc_lockdep_stats_operations);
685
686 #ifdef CONFIG_LOCK_STAT
687 proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
688 &proc_lock_stat_operations);
689 #endif
690
691 return 0;
692 }
693
694 __initcall(lockdep_proc_init);
695
Linux with added FPC-III support