1 // SPDX-License-Identifier: GPL-2.0
41 static void print_name(struct seq_file *m, struct lock_class *class)  in print_name()  argument
44 	const char *name = class->name;  in print_name()
47 		name = __get_key_name(class->key, str);  in print_name()
51 		if (class->name_version > 1)  in print_name()
52 			seq_printf(m, "#%d", class->name_version);  in print_name()
53 		if (class->subclass)  in print_name()
54 			seq_printf(m, "/%d", class->subclass);  in print_name()
60 	struct lock_class *class = list_entry(v, struct lock_class, lock_entry);  in l_show()  local
69 	seq_printf(m, "%p", class->key);  in l_show()
71 	seq_printf(m, " OPS:%8ld", debug_class_ops_read(class));  in l_show()
74 	seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));  in l_show()
75 	seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));  in l_show()
78 	get_usage_chars(class, usage);  in l_show()
82 	print_name(m, class);  in l_show()
85 	list_for_each_entry(entry, &class->locks_after, entry) {  in l_show()
86 		if (entry->distance == 1) {  in l_show()
87 			seq_printf(m, " -> [%p] ", entry->class->key);  in l_show()
88 			print_name(m, entry->class);  in l_show()
113 	return lock_chains + (*pos - 1);  in lc_start()
118 	*pos = lockdep_next_lockchain(*pos - 1) + 1;  in lc_next()
129 	struct lock_class *class;  in lc_show()  local
146 	seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]);  in lc_show()
148 	for (i = 0; i < chain->depth; i++) {  in lc_show()
149 		class = lock_chain_get_class(chain, i);  in lc_show()
150 		if (!class->key)  in lc_show()
153 		seq_printf(m, "[%p] ", class->key);  in lc_show()
154 		print_name(m, class);  in lc_show()
192 	seq_printf(m, " find-mask forwards checks:     %11llu\n",  in lockdep_stats_debug_show()
194 	seq_printf(m, " find-mask backwards checks:    %11llu\n",  in lockdep_stats_debug_show()
220 	struct lock_class *class;  in lockdep_stats_show()  local
222 	list_for_each_entry(class, &all_lock_classes, lock_entry) {  in lockdep_stats_show()
224 		if (class->usage_mask == 0)  in lockdep_stats_show()
226 		if (class->usage_mask == LOCKF_USED)  in lockdep_stats_show()
228 		if (class->usage_mask & LOCKF_USED_IN_IRQ)  in lockdep_stats_show()
230 		if (class->usage_mask & LOCKF_ENABLED_IRQ)  in lockdep_stats_show()
232 		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)  in lockdep_stats_show()
234 		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)  in lockdep_stats_show()
236 		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)  in lockdep_stats_show()
238 		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)  in lockdep_stats_show()
240 		if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)  in lockdep_stats_show()
242 		if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)  in lockdep_stats_show()
244 		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)  in lockdep_stats_show()
246 		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)  in lockdep_stats_show()
248 		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)  in lockdep_stats_show()
250 		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)  in lockdep_stats_show()
253 		sum_forward_deps += lockdep_count_forward_deps(class);  in lockdep_stats_show()
260 	seq_printf(m, " lock-classes:                  %11lu [max: %lu]\n",  in lockdep_stats_show()
270 	 * All irq-safe locks may nest inside irq-unsafe locks,  in lockdep_stats_show()
282 			MAX_LOCKDEP_CHAIN_HLOCKS -  in lockdep_stats_show()
290 	seq_printf(m, " in-hardirq chains:             %11u\n",  in lockdep_stats_show()
292 	seq_printf(m, " in-softirq chains:             %11u\n",  in lockdep_stats_show()
295 	seq_printf(m, " in-process chains:             %11u\n",  in lockdep_stats_show()
297 	seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",  in lockdep_stats_show()
310 	seq_printf(m, " hardirq-safe locks:            %11lu\n",  in lockdep_stats_show()
312 	seq_printf(m, " hardirq-unsafe locks:          %11lu\n",  in lockdep_stats_show()
314 	seq_printf(m, " softirq-safe locks:            %11lu\n",  in lockdep_stats_show()
316 	seq_printf(m, " softirq-unsafe locks:          %11lu\n",  in lockdep_stats_show()
318 	seq_printf(m, " irq-safe locks:                %11lu\n",  in lockdep_stats_show()
320 	seq_printf(m, " irq-unsafe locks:              %11lu\n",  in lockdep_stats_show()
323 	seq_printf(m, " hardirq-read-safe locks:       %11lu\n",  in lockdep_stats_show()
325 	seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",  in lockdep_stats_show()
327 	seq_printf(m, " softirq-read-safe locks:       %11lu\n",  in lockdep_stats_show()
329 	seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",  in lockdep_stats_show()
331 	seq_printf(m, " irq-read-safe locks:           %11lu\n",  in lockdep_stats_show()
333 	seq_printf(m, " irq-read-unsafe locks:         %11lu\n",  in lockdep_stats_show()
368 	struct lock_class *class;  member
385 	nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;  in lock_stat_cmp()
386 	nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;  in lock_stat_cmp()
388 	return nr - nl;  in lock_stat_cmp()
409 	snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);  in snprint_time()
422 	seq_printf(m, "%14lu", lt->nr);  in seq_lock_time()
423 	seq_time(m, lt->min);  in seq_lock_time()
424 	seq_time(m, lt->max);  in seq_lock_time()
425 	seq_time(m, lt->total);  in seq_lock_time()
426 	seq_time(m, lt->nr ? div64_u64(lt->total, lt->nr) : 0);  in seq_lock_time()
433 	struct lock_class *class;  in seq_stats()  local
438 	class = data->class;  in seq_stats()
439 	stats = &data->stats;  in seq_stats()
442 	if (class->name_version > 1)  in seq_stats()
443 		namelen -= 2; /* XXX truncates versions > 9 */  in seq_stats()
444 	if (class->subclass)  in seq_stats()
445 		namelen -= 2;  in seq_stats()
448 	cname = rcu_dereference_sched(class->name);  in seq_stats()
449 	ckey  = rcu_dereference_sched(class->key);  in seq_stats()
467 	if (class->name_version > 1) {  in seq_stats()
468 		snprintf(name+namelen, 3, "#%d", class->name_version);  in seq_stats()
471 	if (class->subclass) {  in seq_stats()
472 		snprintf(name+namelen, 3, "/%d", class->subclass);  in seq_stats()
476 	if (stats->write_holdtime.nr) {  in seq_stats()
477 		if (stats->read_holdtime.nr)  in seq_stats()
478 			seq_printf(m, "%38s-W:", name);  in seq_stats()
482 		seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);  in seq_stats()
483 		seq_lock_time(m, &stats->write_waittime);  in seq_stats()
484 		seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);  in seq_stats()
485 		seq_lock_time(m, &stats->write_holdtime);  in seq_stats()
489 	if (stats->read_holdtime.nr) {  in seq_stats()
490 		seq_printf(m, "%38s-R:", name);  in seq_stats()
491 		seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);  in seq_stats()
492 		seq_lock_time(m, &stats->read_waittime);  in seq_stats()
493 		seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);  in seq_stats()
494 		seq_lock_time(m, &stats->read_holdtime);  in seq_stats()
498 	if (stats->read_waittime.nr + stats->write_waittime.nr == 0)  in seq_stats()
501 	if (stats->read_holdtime.nr)  in seq_stats()
507 		if (class->contention_point[i] == 0)  in seq_stats()
511 			seq_line(m, '-', 40-namelen, namelen);  in seq_stats()
514 				(void *)class->contention_point[i]);  in seq_stats()
516 			   name, stats->contention_point[i],  in seq_stats()
517 			   ip, (void *)class->contention_point[i]);  in seq_stats()
522 		if (class->contending_point[i] == 0)  in seq_stats()
526 			seq_line(m, '-', 40-namelen, namelen);  in seq_stats()
529 				(void *)class->contending_point[i]);  in seq_stats()
531 			   name, stats->contending_point[i],  in seq_stats()
532 			   ip, (void *)class->contending_point[i]);  in seq_stats()
546 		seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");  in seq_header()
548 	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));  in seq_header()
551 			"class name",  in seq_header()
552 			"con-bounces",  in seq_header()
554 			"waittime-min",  in seq_header()
555 			"waittime-max",  in seq_header()
556 			"waittime-total",  in seq_header()
557 			"waittime-avg",  in seq_header()
558 			"acq-bounces",  in seq_header()
560 			"holdtime-min",  in seq_header()
561 			"holdtime-max",  in seq_header()
562 			"holdtime-total",  in seq_header()
563 			"holdtime-avg");  in seq_header()
564 	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));  in seq_header()
570 	struct lock_stat_seq *data = m->private;  in ls_start()
576 	iter = data->stats + (*pos - 1);  in ls_start()
577 	if (iter >= data->iter_end)  in ls_start()
613 	struct lock_class *class;  in lock_stat_open()  local
617 		return -ENOMEM;  in lock_stat_open()
621 		struct lock_stat_data *iter = data->stats;  in lock_stat_open()
622 		struct seq_file *m = file->private_data;  in lock_stat_open()
624 		list_for_each_entry(class, &all_lock_classes, lock_entry) {  in lock_stat_open()
625 			iter->class = class;  in lock_stat_open()
626 			iter->stats = lock_stats(class);  in lock_stat_open()
629 		data->iter_end = iter;  in lock_stat_open()
631 		sort(data->stats, data->iter_end - data->stats,  in lock_stat_open()
635 		m->private = data;  in lock_stat_open()
645 	struct lock_class *class;  in lock_stat_write()  local
650 			return -EFAULT;  in lock_stat_write()
655 		list_for_each_entry(class, &all_lock_classes, lock_entry)  in lock_stat_write()
656 			clear_lock_stats(class);  in lock_stat_write()
663 	struct seq_file *seq = file->private_data;  in lock_stat_release()
665 	vfree(seq->private);  in lock_stat_release()