1 // SPDX-License-Identifier: GPL-2.0
43 	*pos = class - lock_classes;  in l_next()
63 	const char *name = class->name;  in print_name()
66 		name = __get_key_name(class->key, str);  in print_name()
70 		if (class->name_version > 1)  in print_name()
71 			seq_printf(m, "#%d", class->name_version);  in print_name()
72 		if (class->subclass)  in print_name()
73 			seq_printf(m, "/%d", class->subclass);  in print_name()
82 	int idx = class - lock_classes;  in l_show()
90 	seq_printf(m, "%p", class->key);  in l_show()
107 		list_for_each_entry(entry, &class->locks_after, entry) {  in l_show()
108 			if (entry->distance == 1) {  in l_show()
109 				seq_printf(m, " -> [%p] ", entry->class->key);  in l_show()
110 				print_name(m, entry->class);  in l_show()
136 	return lock_chains + (*pos - 1);  in lc_start()
141 	*pos = lockdep_next_lockchain(*pos - 1) + 1;  in lc_next()
169 	seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]);  in lc_show()
171 	for (i = 0; i < chain->depth; i++) {  in lc_show()
173 		if (!class->key)  in lc_show()
176 		seq_printf(m, "[%p] ", class->key);  in lc_show()
205 	seq_printf(m, " chain lookup misses:           %11llu\n",  in lockdep_stats_debug_show()
207 	seq_printf(m, " chain lookup hits:             %11llu\n",  in lockdep_stats_debug_show()
209 	seq_printf(m, " cyclic checks:                 %11llu\n",  in lockdep_stats_debug_show()
211 	seq_printf(m, " redundant checks:              %11llu\n",  in lockdep_stats_debug_show()
213 	seq_printf(m, " redundant links:               %11llu\n",  in lockdep_stats_debug_show()
215 	seq_printf(m, " find-mask forwards checks:     %11llu\n",  in lockdep_stats_debug_show()
217 	seq_printf(m, " find-mask backwards checks:    %11llu\n",  in lockdep_stats_debug_show()
220 	seq_printf(m, " hardirq on events:             %11llu\n", hi1);  in lockdep_stats_debug_show()
221 	seq_printf(m, " hardirq off events:            %11llu\n", hi2);  in lockdep_stats_debug_show()
222 	seq_printf(m, " redundant hardirq ons:         %11llu\n", hr1);  in lockdep_stats_debug_show()
223 	seq_printf(m, " redundant hardirq offs:        %11llu\n", hr2);  in lockdep_stats_debug_show()
224 	seq_printf(m, " softirq on events:             %11llu\n", si1);  in lockdep_stats_debug_show()
225 	seq_printf(m, " softirq off events:            %11llu\n", si2);  in lockdep_stats_debug_show()
226 	seq_printf(m, " redundant softirq ons:         %11llu\n", sr1);  in lockdep_stats_debug_show()
227 	seq_printf(m, " redundant softirq offs:        %11llu\n", sr2);  in lockdep_stats_debug_show()
250 		if (class->usage_mask == 0)  in lockdep_stats_show()
252 		if (class->usage_mask == LOCKF_USED)  in lockdep_stats_show()
254 		if (class->usage_mask & LOCKF_USED_IN_IRQ)  in lockdep_stats_show()
256 		if (class->usage_mask & LOCKF_ENABLED_IRQ)  in lockdep_stats_show()
258 		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)  in lockdep_stats_show()
260 		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)  in lockdep_stats_show()
262 		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)  in lockdep_stats_show()
264 		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)  in lockdep_stats_show()
266 		if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)  in lockdep_stats_show()
268 		if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)  in lockdep_stats_show()
270 		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)  in lockdep_stats_show()
272 		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)  in lockdep_stats_show()
274 		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)  in lockdep_stats_show()
276 		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)  in lockdep_stats_show()
287 	seq_printf(m, " lock-classes:                  %11lu [max: %lu]\n",  in lockdep_stats_show()
289 	seq_printf(m, " direct dependencies:           %11lu [max: %lu]\n",  in lockdep_stats_show()
291 	seq_printf(m, " indirect dependencies:         %11lu\n",  in lockdep_stats_show()
297 	 * All irq-safe locks may nest inside irq-unsafe locks,  in lockdep_stats_show()
300 	seq_printf(m, " all direct dependencies:       %11lu\n",  in lockdep_stats_show()
306 	seq_printf(m, " dependency chains:             %11lu [max: %lu]\n",  in lockdep_stats_show()
308 	seq_printf(m, " dependency chain hlocks used:  %11lu [max: %lu]\n",  in lockdep_stats_show()
309 			MAX_LOCKDEP_CHAIN_HLOCKS -  in lockdep_stats_show()
312 	seq_printf(m, " dependency chain hlocks lost:  %11u\n",  in lockdep_stats_show()
317 	seq_printf(m, " in-hardirq chains:             %11u\n",  in lockdep_stats_show()
319 	seq_printf(m, " in-softirq chains:             %11u\n",  in lockdep_stats_show()
322 	seq_printf(m, " in-process chains:             %11u\n",  in lockdep_stats_show()
324 	seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",  in lockdep_stats_show()
327 	seq_printf(m, " number of stack traces:        %11llu\n",  in lockdep_stats_show()
329 	seq_printf(m, " number of stack hash chains:   %11llu\n",  in lockdep_stats_show()
332 	seq_printf(m, " combined max dependencies:     %11u\n",  in lockdep_stats_show()
337 	seq_printf(m, " hardirq-safe locks:            %11lu\n",  in lockdep_stats_show()
339 	seq_printf(m, " hardirq-unsafe locks:          %11lu\n",  in lockdep_stats_show()
341 	seq_printf(m, " softirq-safe locks:            %11lu\n",  in lockdep_stats_show()
343 	seq_printf(m, " softirq-unsafe locks:          %11lu\n",  in lockdep_stats_show()
345 	seq_printf(m, " irq-safe locks:                %11lu\n",  in lockdep_stats_show()
347 	seq_printf(m, " irq-unsafe locks:              %11lu\n",  in lockdep_stats_show()
350 	seq_printf(m, " hardirq-read-safe locks:       %11lu\n",  in lockdep_stats_show()
352 	seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",  in lockdep_stats_show()
354 	seq_printf(m, " softirq-read-safe locks:       %11lu\n",  in lockdep_stats_show()
356 	seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",  in lockdep_stats_show()
358 	seq_printf(m, " irq-read-safe locks:           %11lu\n",  in lockdep_stats_show()
360 	seq_printf(m, " irq-read-unsafe locks:         %11lu\n",  in lockdep_stats_show()
363 	seq_printf(m, " uncategorized locks:           %11lu\n",  in lockdep_stats_show()
365 	seq_printf(m, " unused locks:                  %11lu\n",  in lockdep_stats_show()
367 	seq_printf(m, " max locking depth:             %11u\n",  in lockdep_stats_show()
370 	seq_printf(m, " max bfs queue depth:           %11u\n",  in lockdep_stats_show()
373 	seq_printf(m, " max lock class index:          %11lu\n",  in lockdep_stats_show()
376 	seq_printf(m, " debug_locks:                   %11u\n",  in lockdep_stats_show()
383 	seq_printf(m, " zapped classes:                %11lu\n",  in lockdep_stats_show()
386 	seq_printf(m, " zapped lock chains:            %11lu\n",  in lockdep_stats_show()
388 	seq_printf(m, " large chain blocks:            %11u\n",  in lockdep_stats_show()
414 	nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;  in lock_stat_cmp()
415 	nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;  in lock_stat_cmp()
417 	return nr - nl;  in lock_stat_cmp()
446 	seq_printf(m, " %14s", num);  in seq_time()
451 	seq_printf(m, "%14lu", lt->nr);  in seq_lock_time()
452 	seq_time(m, lt->min);  in seq_lock_time()
453 	seq_time(m, lt->max);  in seq_lock_time()
454 	seq_time(m, lt->total);  in seq_lock_time()
455 	seq_time(m, lt->nr ? div64_u64(lt->total, lt->nr) : 0);  in seq_lock_time()
467 	class = data->class;  in seq_stats()
468 	stats = &data->stats;  in seq_stats()
471 	if (class->name_version > 1)  in seq_stats()
472 		namelen -= 2; /* XXX truncates versions > 9 */  in seq_stats()
473 	if (class->subclass)  in seq_stats()
474 		namelen -= 2;  in seq_stats()
477 	cname = rcu_dereference_sched(class->name);  in seq_stats()
478 	ckey  = rcu_dereference_sched(class->key);  in seq_stats()
496 	if (class->name_version > 1) {  in seq_stats()
497 		snprintf(name+namelen, 3, "#%d", class->name_version);  in seq_stats()
500 	if (class->subclass) {  in seq_stats()
501 		snprintf(name+namelen, 3, "/%d", class->subclass);  in seq_stats()
505 	if (stats->write_holdtime.nr) {  in seq_stats()
506 		if (stats->read_holdtime.nr)  in seq_stats()
507 			seq_printf(m, "%38s-W:", name);  in seq_stats()
511 		seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);  in seq_stats()
512 		seq_lock_time(m, &stats->write_waittime);  in seq_stats()
513 		seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);  in seq_stats()
514 		seq_lock_time(m, &stats->write_holdtime);  in seq_stats()
518 	if (stats->read_holdtime.nr) {  in seq_stats()
519 		seq_printf(m, "%38s-R:", name);  in seq_stats()
520 		seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);  in seq_stats()
521 		seq_lock_time(m, &stats->read_waittime);  in seq_stats()
522 		seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);  in seq_stats()
523 		seq_lock_time(m, &stats->read_holdtime);  in seq_stats()
527 	if (stats->read_waittime.nr + stats->write_waittime.nr == 0)  in seq_stats()
530 	if (stats->read_holdtime.nr)  in seq_stats()
536 		if (class->contention_point[i] == 0)  in seq_stats()
540 			seq_line(m, '-', 40-namelen, namelen);  in seq_stats()
543 				(void *)class->contention_point[i]);  in seq_stats()
544 		seq_printf(m, "%40s %14lu %29s %pS\n",  in seq_stats()
545 			   name, stats->contention_point[i],  in seq_stats()
546 			   ip, (void *)class->contention_point[i]);  in seq_stats()
551 		if (class->contending_point[i] == 0)  in seq_stats()
555 			seq_line(m, '-', 40-namelen, namelen);  in seq_stats()
558 				(void *)class->contending_point[i]);  in seq_stats()
559 		seq_printf(m, "%40s %14lu %29s %pS\n",  in seq_stats()
560 			   name, stats->contending_point[i],  in seq_stats()
561 			   ip, (void *)class->contending_point[i]);  in seq_stats()
565 		seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));  in seq_stats()
575 		seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");  in seq_header()
577 	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));  in seq_header()
578 	seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "  in seq_header()
579 			"%14s %14s\n",  in seq_header()
581 			"con-bounces",  in seq_header()
583 			"waittime-min",  in seq_header()
584 			"waittime-max",  in seq_header()
585 			"waittime-total",  in seq_header()
586 			"waittime-avg",  in seq_header()
587 			"acq-bounces",  in seq_header()
589 			"holdtime-min",  in seq_header()
590 			"holdtime-max",  in seq_header()
591 			"holdtime-total",  in seq_header()
592 			"holdtime-avg");  in seq_header()
593 	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));  in seq_header()
599 	struct lock_stat_seq *data = m->private;  in ls_start()
605 	iter = data->stats + (*pos - 1);  in ls_start()
606 	if (iter >= data->iter_end)  in ls_start()
646 		return -ENOMEM;  in lock_stat_open()
650 		struct lock_stat_data *iter = data->stats;  in lock_stat_open()
651 		struct seq_file *m = file->private_data;  in lock_stat_open()
657 			iter->class = class;  in lock_stat_open()
658 			iter->stats = lock_stats(class);  in lock_stat_open()
662 		data->iter_end = iter;  in lock_stat_open()
664 		sort(data->stats, data->iter_end - data->stats,  in lock_stat_open()
668 		m->private = data;  in lock_stat_open()
684 			return -EFAULT;  in lock_stat_write()
700 	struct seq_file *seq = file->private_data;  in lock_stat_release()
702 	vfree(seq->private);  in lock_stat_release()