[mirror_ubuntu-bionic-kernel.git] / kernel / locking / lockdep_proc.c

/*
 * kernel/lockdep_proc.c
 *
 * Runtime locking correctness validator
 *
 * Started by Ingo Molnar:
 *
 *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
 *
 * Code for /proc/lockdep and /proc/lockdep_stats:
 *
 */
#include <linux/export.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/debug_locks.h>
#include <linux/vmalloc.h>
#include <linux/sort.h>
#include <linux/uaccess.h>
#include <asm/div64.h>

#include "lockdep_internals.h"

static void *l_next(struct seq_file *m, void *v, loff_t *pos)
{
	return seq_list_next(v, &all_lock_classes, pos);
}

static void *l_start(struct seq_file *m, loff_t *pos)
{
	return seq_list_start_head(&all_lock_classes, *pos);
}

static void l_stop(struct seq_file *m, void *v)
{
}

static void print_name(struct seq_file *m, struct lock_class *class)
{
	char str[KSYM_NAME_LEN];
	const char *name = class->name;

	if (!name) {
		name = __get_key_name(class->key, str);
		seq_printf(m, "%s", name);
	} else{
		seq_printf(m, "%s", name);
		if (class->name_version > 1)
			seq_printf(m, "#%d", class->name_version);
		if (class->subclass)
			seq_printf(m, "/%d", class->subclass);
	}
}

static int l_show(struct seq_file *m, void *v)
{
	struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
	struct lock_list *entry;
	char usage[LOCK_USAGE_CHARS];

	if (v == &all_lock_classes) {
		seq_printf(m, "all lock classes:\n");
		return 0;
	}

	seq_printf(m, "%p", class->key);
#ifdef CONFIG_DEBUG_LOCKDEP
	seq_printf(m, " OPS:%8ld", class->ops);
#endif
#ifdef CONFIG_PROVE_LOCKING
	seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
	seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
#endif

	get_usage_chars(class, usage);
	seq_printf(m, " %s", usage);

	seq_printf(m, ": ");
	print_name(m, class);
	seq_puts(m, "\n");

	list_for_each_entry(entry, &class->locks_after, entry) {
		if (entry->distance == 1) {
			seq_printf(m, " -> [%p] ", entry->class->key);
			print_name(m, entry->class);
			seq_puts(m, "\n");
		}
	}
	seq_puts(m, "\n");

	return 0;
}

static const struct seq_operations lockdep_ops = {
	.start	= l_start,
	.next	= l_next,
	.stop	= l_stop,
	.show	= l_show,
};

static int lockdep_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &lockdep_ops);
}

static const struct file_operations proc_lockdep_operations = {
	.open		= lockdep_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

#ifdef CONFIG_PROVE_LOCKING
static void *lc_start(struct seq_file *m, loff_t *pos)
{
	if (*pos == 0)
		return SEQ_START_TOKEN;

	if (*pos - 1 < nr_lock_chains)
		return lock_chains + (*pos - 1);

	return NULL;
}

static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return lc_start(m, pos);
}

static void lc_stop(struct seq_file *m, void *v)
{
}

static int lc_show(struct seq_file *m, void *v)
{
	struct lock_chain *chain = v;
	struct lock_class *class;
	int i;

	if (v == SEQ_START_TOKEN) {
		if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
			seq_printf(m, "(buggered) ");
		seq_printf(m, "all lock chains:\n");
		return 0;
	}

	seq_printf(m, "irq_context: %d\n", chain->irq_context);

	for (i = 0; i < chain->depth; i++) {
		class = lock_chain_get_class(chain, i);
		if (!class->key)
			continue;

		seq_printf(m, "[%p] ", class->key);
		print_name(m, class);
		seq_puts(m, "\n");
	}
	seq_puts(m, "\n");

	return 0;
}

static const struct seq_operations lockdep_chains_ops = {
	.start	= lc_start,
	.next	= lc_next,
	.stop	= lc_stop,
	.show	= lc_show,
};

static int lockdep_chains_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &lockdep_chains_ops);
}

static const struct file_operations proc_lockdep_chains_operations = {
	.open		= lockdep_chains_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif /* CONFIG_PROVE_LOCKING */

static void lockdep_stats_debug_show(struct seq_file *m)
{
#ifdef CONFIG_DEBUG_LOCKDEP
	unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
			   hi2 = debug_atomic_read(hardirqs_off_events),
			   hr1 = debug_atomic_read(redundant_hardirqs_on),
			   hr2 = debug_atomic_read(redundant_hardirqs_off),
			   si1 = debug_atomic_read(softirqs_on_events),
			   si2 = debug_atomic_read(softirqs_off_events),
			   sr1 = debug_atomic_read(redundant_softirqs_on),
			   sr2 = debug_atomic_read(redundant_softirqs_off);

	seq_printf(m, " chain lookup misses:           %11llu\n",
		debug_atomic_read(chain_lookup_misses));
	seq_printf(m, " chain lookup hits:             %11llu\n",
		debug_atomic_read(chain_lookup_hits));
	seq_printf(m, " cyclic checks:                 %11llu\n",
		debug_atomic_read(nr_cyclic_checks));
	seq_printf(m, " find-mask forwards checks:     %11llu\n",
		debug_atomic_read(nr_find_usage_forwards_checks));
	seq_printf(m, " find-mask backwards checks:    %11llu\n",
		debug_atomic_read(nr_find_usage_backwards_checks));

	seq_printf(m, " hardirq on events:             %11llu\n", hi1);
	seq_printf(m, " hardirq off events:            %11llu\n", hi2);
	seq_printf(m, " redundant hardirq ons:         %11llu\n", hr1);
	seq_printf(m, " redundant hardirq offs:        %11llu\n", hr2);
	seq_printf(m, " softirq on events:             %11llu\n", si1);
	seq_printf(m, " softirq off events:            %11llu\n", si2);
	seq_printf(m, " redundant softirq ons:         %11llu\n", sr1);
	seq_printf(m, " redundant softirq offs:        %11llu\n", sr2);
#endif
}

static int lockdep_stats_show(struct seq_file *m, void *v)
{
	struct lock_class *class;
	unsigned long nr_unused = 0, nr_uncategorized = 0,
		      nr_irq_safe = 0, nr_irq_unsafe = 0,
		      nr_softirq_safe = 0, nr_softirq_unsafe = 0,
		      nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
		      nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
		      nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
		      nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
		      sum_forward_deps = 0;

	list_for_each_entry(class, &all_lock_classes, lock_entry) {

		if (class->usage_mask == 0)
			nr_unused++;
		if (class->usage_mask == LOCKF_USED)
			nr_uncategorized++;
		if (class->usage_mask & LOCKF_USED_IN_IRQ)
			nr_irq_safe++;
		if (class->usage_mask & LOCKF_ENABLED_IRQ)
			nr_irq_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
			nr_softirq_safe++;
		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
			nr_softirq_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
			nr_hardirq_safe++;
		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
			nr_hardirq_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
			nr_irq_read_safe++;
		if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
			nr_irq_read_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
			nr_softirq_read_safe++;
		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
			nr_softirq_read_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
			nr_hardirq_read_safe++;
		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
			nr_hardirq_read_unsafe++;

#ifdef CONFIG_PROVE_LOCKING
		sum_forward_deps += lockdep_count_forward_deps(class);
#endif
	}
#ifdef CONFIG_DEBUG_LOCKDEP
	DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
#endif
	seq_printf(m, " lock-classes:                  %11lu [max: %lu]\n",
			nr_lock_classes, MAX_LOCKDEP_KEYS);
	seq_printf(m, " direct dependencies:           %11lu [max: %lu]\n",
			nr_list_entries, MAX_LOCKDEP_ENTRIES);
	seq_printf(m, " indirect dependencies:         %11lu\n",
			sum_forward_deps);

	/*
	 * Total number of dependencies:
	 *
	 * All irq-safe locks may nest inside irq-unsafe locks,
	 * plus all the other known dependencies:
	 */
	seq_printf(m, " all direct dependencies:       %11lu\n",
			nr_irq_unsafe * nr_irq_safe +
			nr_hardirq_unsafe * nr_hardirq_safe +
			nr_list_entries);

#ifdef CONFIG_PROVE_LOCKING
	seq_printf(m, " dependency chains:             %11lu [max: %lu]\n",
			nr_lock_chains, MAX_LOCKDEP_CHAINS);
	seq_printf(m, " dependency chain hlocks:       %11d [max: %lu]\n",
			nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
#endif

#ifdef CONFIG_TRACE_IRQFLAGS
	seq_printf(m, " in-hardirq chains:             %11u\n",
			nr_hardirq_chains);
	seq_printf(m, " in-softirq chains:             %11u\n",
			nr_softirq_chains);
#endif
	seq_printf(m, " in-process chains:             %11u\n",
			nr_process_chains);
	seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",
			nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
	seq_printf(m, " combined max dependencies:     %11u\n",
			(nr_hardirq_chains + 1) *
			(nr_softirq_chains + 1) *
			(nr_process_chains + 1)
	);
	seq_printf(m, " hardirq-safe locks:            %11lu\n",
			nr_hardirq_safe);
	seq_printf(m, " hardirq-unsafe locks:          %11lu\n",
			nr_hardirq_unsafe);
	seq_printf(m, " softirq-safe locks:            %11lu\n",
			nr_softirq_safe);
	seq_printf(m, " softirq-unsafe locks:          %11lu\n",
			nr_softirq_unsafe);
	seq_printf(m, " irq-safe locks:                %11lu\n",
			nr_irq_safe);
	seq_printf(m, " irq-unsafe locks:              %11lu\n",
			nr_irq_unsafe);

	seq_printf(m, " hardirq-read-safe locks:       %11lu\n",
			nr_hardirq_read_safe);
	seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",
			nr_hardirq_read_unsafe);
	seq_printf(m, " softirq-read-safe locks:       %11lu\n",
			nr_softirq_read_safe);
	seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",
			nr_softirq_read_unsafe);
	seq_printf(m, " irq-read-safe locks:           %11lu\n",
			nr_irq_read_safe);
	seq_printf(m, " irq-read-unsafe locks:         %11lu\n",
			nr_irq_read_unsafe);

	seq_printf(m, " uncategorized locks:           %11lu\n",
			nr_uncategorized);
	seq_printf(m, " unused locks:                  %11lu\n",
			nr_unused);
	seq_printf(m, " max locking depth:             %11u\n",
			max_lockdep_depth);
#ifdef CONFIG_PROVE_LOCKING
	seq_printf(m, " max bfs queue depth:           %11u\n",
			max_bfs_queue_depth);
#endif
	lockdep_stats_debug_show(m);
	seq_printf(m, " debug_locks:                   %11u\n",
			debug_locks);

	return 0;
}

static int lockdep_stats_open(struct inode *inode, struct file *file)
{
	return single_open(file, lockdep_stats_show, NULL);
}

static const struct file_operations proc_lockdep_stats_operations = {
	.open		= lockdep_stats_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

#ifdef CONFIG_LOCK_STAT

struct lock_stat_data {
	struct lock_class *class;
	struct lock_class_stats stats;
};

struct lock_stat_seq {
	struct lock_stat_data *iter_end;
	struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
};

/*
 * sort on absolute number of contentions
 */
static int lock_stat_cmp(const void *l, const void *r)
{
	const struct lock_stat_data *dl = l, *dr = r;
	unsigned long nl, nr;

	nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
	nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;

	return nr - nl;
}

static void seq_line(struct seq_file *m, char c, int offset, int length)
{
	int i;

	for (i = 0; i < offset; i++)
		seq_puts(m, " ");
	for (i = 0; i < length; i++)
		seq_printf(m, "%c", c);
	seq_puts(m, "\n");
}

static void snprint_time(char *buf, size_t bufsiz, s64 nr)
{
	s64 div;
	s32 rem;

	nr += 5; /* for display rounding */
	div = div_s64_rem(nr, 1000, &rem);
	snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
}

static void seq_time(struct seq_file *m, s64 time)
{
	char num[15];

	snprint_time(num, sizeof(num), time);
	seq_printf(m, " %14s", num);
}

static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
{
	seq_printf(m, "%14lu", lt->nr);
	seq_time(m, lt->min);
	seq_time(m, lt->max);
	seq_time(m, lt->total);
	seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
}

static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
{
	struct lockdep_subclass_key *ckey;
	struct lock_class_stats *stats;
	struct lock_class *class;
	const char *cname;
	int i, namelen;
	char name[39];

	class = data->class;
	stats = &data->stats;

	namelen = 38;
	if (class->name_version > 1)
		namelen -= 2; /* XXX truncates versions > 9 */
	if (class->subclass)
		namelen -= 2;

	rcu_read_lock_sched();
	cname = rcu_dereference_sched(class->name);
	ckey  = rcu_dereference_sched(class->key);

	if (!cname && !ckey) {
		rcu_read_unlock_sched();
		return;

	} else if (!cname) {
		char str[KSYM_NAME_LEN];
		const char *key_name;

		key_name = __get_key_name(ckey, str);
		snprintf(name, namelen, "%s", key_name);
	} else {
		snprintf(name, namelen, "%s", cname);
	}
	rcu_read_unlock_sched();

	namelen = strlen(name);
	if (class->name_version > 1) {
		snprintf(name+namelen, 3, "#%d", class->name_version);
		namelen += 2;
	}
	if (class->subclass) {
		snprintf(name+namelen, 3, "/%d", class->subclass);
		namelen += 2;
	}

	if (stats->write_holdtime.nr) {
		if (stats->read_holdtime.nr)
			seq_printf(m, "%38s-W:", name);
		else
			seq_printf(m, "%40s:", name);

		seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
		seq_lock_time(m, &stats->write_waittime);
		seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
		seq_lock_time(m, &stats->write_holdtime);
		seq_puts(m, "\n");
	}

	if (stats->read_holdtime.nr) {
		seq_printf(m, "%38s-R:", name);
		seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
		seq_lock_time(m, &stats->read_waittime);
		seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
		seq_lock_time(m, &stats->read_holdtime);
		seq_puts(m, "\n");
	}

	if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
		return;

	if (stats->read_holdtime.nr)
		namelen += 2;

	for (i = 0; i < LOCKSTAT_POINTS; i++) {
		char ip[32];

		if (class->contention_point[i] == 0)
			break;

		if (!i)
			seq_line(m, '-', 40-namelen, namelen);

		snprintf(ip, sizeof(ip), "[<%p>]",
				(void *)class->contention_point[i]);
		seq_printf(m, "%40s %14lu %29s %pS\n",
			   name, stats->contention_point[i],
			   ip, (void *)class->contention_point[i]);
	}
	for (i = 0; i < LOCKSTAT_POINTS; i++) {
		char ip[32];

		if (class->contending_point[i] == 0)
			break;

		if (!i)
			seq_line(m, '-', 40-namelen, namelen);

		snprintf(ip, sizeof(ip), "[<%p>]",
				(void *)class->contending_point[i]);
		seq_printf(m, "%40s %14lu %29s %pS\n",
			   name, stats->contending_point[i],
			   ip, (void *)class->contending_point[i]);
	}
	if (i) {
		seq_puts(m, "\n");
		seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
		seq_puts(m, "\n");
	}
}

static void seq_header(struct seq_file *m)
{
	seq_puts(m, "lock_stat version 0.4\n");

	if (unlikely(!debug_locks))
		seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");

	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
	seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
			"%14s %14s\n",
			"class name",
			"con-bounces",
			"contentions",
			"waittime-min",
			"waittime-max",
			"waittime-total",
			"waittime-avg",
			"acq-bounces",
			"acquisitions",
			"holdtime-min",
			"holdtime-max",
			"holdtime-total",
			"holdtime-avg");
	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
	seq_printf(m, "\n");
}

static void *ls_start(struct seq_file *m, loff_t *pos)
{
	struct lock_stat_seq *data = m->private;
	struct lock_stat_data *iter;

	if (*pos == 0)
		return SEQ_START_TOKEN;

	iter = data->stats + (*pos - 1);
	if (iter >= data->iter_end)
		iter = NULL;

	return iter;
}

static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return ls_start(m, pos);
}

static void ls_stop(struct seq_file *m, void *v)
{
}

static int ls_show(struct seq_file *m, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_header(m);
	else
		seq_stats(m, v);

	return 0;
}

static const struct seq_operations lockstat_ops = {
	.start	= ls_start,
	.next	= ls_next,
	.stop	= ls_stop,
	.show	= ls_show,
};

static int lock_stat_open(struct inode *inode, struct file *file)
{
	int res;
	struct lock_class *class;
	struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));

	if (!data)
		return -ENOMEM;

	res = seq_open(file, &lockstat_ops);
	if (!res) {
		struct lock_stat_data *iter = data->stats;
		struct seq_file *m = file->private_data;

		list_for_each_entry(class, &all_lock_classes, lock_entry) {
			iter->class = class;
			iter->stats = lock_stats(class);
			iter++;
		}
		data->iter_end = iter;

		sort(data->stats, data->iter_end - data->stats,
				sizeof(struct lock_stat_data),
				lock_stat_cmp, NULL);

		m->private = data;
	} else
		vfree(data);

	return res;
}

static ssize_t lock_stat_write(struct file *file, const char __user *buf,
			       size_t count, loff_t *ppos)
{
	struct lock_class *class;
	char c;

	if (count) {
		if (get_user(c, buf))
			return -EFAULT;

		if (c != '0')
			return count;

		list_for_each_entry(class, &all_lock_classes, lock_entry)
			clear_lock_stats(class);
	}
	return count;
}

static int lock_stat_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;

	vfree(seq->private);
	return seq_release(inode, file);
}

static const struct file_operations proc_lock_stat_operations = {
	.open		= lock_stat_open,
	.write		= lock_stat_write,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= lock_stat_release,
};
#endif /* CONFIG_LOCK_STAT */

static int __init lockdep_proc_init(void)
{
	proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
#ifdef CONFIG_PROVE_LOCKING
	proc_create("lockdep_chains", S_IRUSR, NULL,
		    &proc_lockdep_chains_operations);
#endif
	proc_create("lockdep_stats", S_IRUSR, NULL,
		    &proc_lockdep_stats_operations);

#ifdef CONFIG_LOCK_STAT
	proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
		    &proc_lock_stat_operations);
#endif

	return 0;
}

__initcall(lockdep_proc_init);
Commit	Line	Data
a8f24a39 IM	1	/*
	2	* kernel/lockdep_proc.c
	3	*
	4	* Runtime locking correctness validator
	5	*
	6	* Started by Ingo Molnar:
	7	*
4b32d0a4	8	* Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
90eec103	9	* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
a8f24a39 IM	10	*
	11	* Code for /proc/lockdep and /proc/lockdep_stats:
	12	*
	13	*/
9984de1a	14	#include <linux/export.h>
a8f24a39 IM	15	#include <linux/proc_fs.h>
	16	#include <linux/seq_file.h>
	17	#include <linux/kallsyms.h>
	18	#include <linux/debug_locks.h>
c46261de PZ	19	#include <linux/vmalloc.h>
c46261de PZ	20	#include <linux/sort.h>
7c0f6ba6	21	#include <linux/uaccess.h>
c46261de	22	#include <asm/div64.h>
a8f24a39 IM	23
	24	#include "lockdep_internals.h"
	25
	26	static void l_next(struct seq_file m, void v, loff_t pos)
	27	{
8109e1de	28	return seq_list_next(v, &all_lock_classes, pos);
a8f24a39 IM	29	}
	30
	31	static void l_start(struct seq_file m, loff_t *pos)
	32	{
8109e1de	33	return seq_list_start_head(&all_lock_classes, *pos);
a8f24a39 IM	34	}
	35
	36	static void l_stop(struct seq_file m, void v)
	37	{
	38	}
	39
068135e6 JB	40	static void print_name(struct seq_file m, struct lock_class class)
068135e6 JB	41	{
99fb4a12	42	char str[KSYM_NAME_LEN];
068135e6 JB	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
a8f24a39 IM	57	static int l_show(struct seq_file m, void v)
a8f24a39 IM	58	{
8109e1de	59	struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
068135e6	60	struct lock_list *entry;
f510b233	61	char usage[LOCK_USAGE_CHARS];
a8f24a39	62
8109e1de	63	if (v == &all_lock_classes) {
94c61c0a TP	64	seq_printf(m, "all lock classes:\n");
	65	return 0;
	66	}
	67
a8f24a39 IM	68	seq_printf(m, "%p", class->key);
	69	#ifdef CONFIG_DEBUG_LOCKDEP
	70	seq_printf(m, " OPS:%8ld", class->ops);
	71	#endif
df60a844 SH	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
a8f24a39	76
f510b233 PZ	77	get_usage_chars(class, usage);
f510b233 PZ	78	seq_printf(m, " %s", usage);
a8f24a39	79
068135e6 JB	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) {
2429e4ee	86	seq_printf(m, " -> [%p] ", entry->class->key);
068135e6 JB	87	print_name(m, entry->class);
	88	seq_puts(m, "\n");
	89	}
a8f24a39 IM	90	}
	91	seq_puts(m, "\n");
	92
	93	return 0;
	94	}
	95
15ad7cdc	96	static const struct seq_operations lockdep_ops = {
a8f24a39 IM	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	{
8109e1de	105	return seq_open(file, &lockdep_ops);
a8f24a39 IM	106	}
a8f24a39 IM	107
15ad7cdc	108	static const struct file_operations proc_lockdep_operations = {
a8f24a39 IM	109	.open = lockdep_open,
	110	.read = seq_read,
	111	.llseek = seq_lseek,
	112	.release = seq_release,
	113	};
	114
cd1a28e8	115	#ifdef CONFIG_PROVE_LOCKING
443cd507 HY	116	static void lc_start(struct seq_file m, loff_t *pos)
	117	{
	118	if (*pos == 0)
	119	return SEQ_START_TOKEN;
	120
e9d65725 LZ	121	if (*pos - 1 < nr_lock_chains)
e9d65725 LZ	122	return lock_chains + (*pos - 1);
443cd507 HY	123
	124	return NULL;
	125	}
	126
12aac19d LZ	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
443cd507 HY	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) {
75dd602a PZ	144	if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
75dd602a PZ	145	seq_printf(m, "(buggered) ");
443cd507 HY	146	seq_printf(m, "all lock chains:\n");
	147	return 0;
	148	}
	149
	150	seq_printf(m, "irq_context: %d\n", chain->irq_context);
	151
	152	for (i = 0; i < chain->depth; i++) {
	153	class = lock_chain_get_class(chain, i);
8bfe0298 RV	154	if (!class->key)
	155	continue;
	156
443cd507 HY	157	seq_printf(m, "[%p] ", class->key);
	158	print_name(m, class);
	159	seq_puts(m, "\n");
	160	}
	161	seq_puts(m, "\n");
	162
	163	return 0;
	164	}
	165
	166	static const struct seq_operations lockdep_chains_ops = {
	167	.start = lc_start,
	168	.next = lc_next,
	169	.stop = lc_stop,
	170	.show = lc_show,
	171	};
	172
	173	static int lockdep_chains_open(struct inode inode, struct file file)
	174	{
12aac19d	175	return seq_open(file, &lockdep_chains_ops);
443cd507 HY	176	}
	177
	178	static const struct file_operations proc_lockdep_chains_operations = {
	179	.open = lockdep_chains_open,
	180	.read = seq_read,
	181	.llseek = seq_lseek,
	182	.release = seq_release,
	183	};
cd1a28e8	184	#endif /* CONFIG_PROVE_LOCKING */
443cd507	185
a8f24a39 IM	186	static void lockdep_stats_debug_show(struct seq_file *m)
	187	{
	188	#ifdef CONFIG_DEBUG_LOCKDEP
bd6d29c2 FW	189	unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
	190	hi2 = debug_atomic_read(hardirqs_off_events),
	191	hr1 = debug_atomic_read(redundant_hardirqs_on),
	192	hr2 = debug_atomic_read(redundant_hardirqs_off),
	193	si1 = debug_atomic_read(softirqs_on_events),
	194	si2 = debug_atomic_read(softirqs_off_events),
	195	sr1 = debug_atomic_read(redundant_softirqs_on),
	196	sr2 = debug_atomic_read(redundant_softirqs_off);
	197
	198	seq_printf(m, " chain lookup misses: %11llu\n",
	199	debug_atomic_read(chain_lookup_misses));
	200	seq_printf(m, " chain lookup hits: %11llu\n",
	201	debug_atomic_read(chain_lookup_hits));
	202	seq_printf(m, " cyclic checks: %11llu\n",
	203	debug_atomic_read(nr_cyclic_checks));
	204	seq_printf(m, " find-mask forwards checks: %11llu\n",
	205	debug_atomic_read(nr_find_usage_forwards_checks));
	206	seq_printf(m, " find-mask backwards checks: %11llu\n",
	207	debug_atomic_read(nr_find_usage_backwards_checks));
	208
	209	seq_printf(m, " hardirq on events: %11llu\n", hi1);
	210	seq_printf(m, " hardirq off events: %11llu\n", hi2);
	211	seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
	212	seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
	213	seq_printf(m, " softirq on events: %11llu\n", si1);
	214	seq_printf(m, " softirq off events: %11llu\n", si2);
	215	seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
	216	seq_printf(m, " redundant softirq offs: %11llu\n", sr2);
a8f24a39 IM	217	#endif
	218	}
	219
	220	static int lockdep_stats_show(struct seq_file m, void v)
	221	{
	222	struct lock_class *class;
	223	unsigned long nr_unused = 0, nr_uncategorized = 0,
	224	nr_irq_safe = 0, nr_irq_unsafe = 0,
	225	nr_softirq_safe = 0, nr_softirq_unsafe = 0,
	226	nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
	227	nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
	228	nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
	229	nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
dec29608	230	sum_forward_deps = 0;
a8f24a39 IM	231
	232	list_for_each_entry(class, &all_lock_classes, lock_entry) {
	233
	234	if (class->usage_mask == 0)
	235	nr_unused++;
	236	if (class->usage_mask == LOCKF_USED)
	237	nr_uncategorized++;
	238	if (class->usage_mask & LOCKF_USED_IN_IRQ)
	239	nr_irq_safe++;
4fc95e86	240	if (class->usage_mask & LOCKF_ENABLED_IRQ)
a8f24a39 IM	241	nr_irq_unsafe++;
	242	if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
	243	nr_softirq_safe++;
4fc95e86	244	if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
a8f24a39 IM	245	nr_softirq_unsafe++;
	246	if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
	247	nr_hardirq_safe++;
4fc95e86	248	if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
a8f24a39 IM	249	nr_hardirq_unsafe++;
	250	if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
	251	nr_irq_read_safe++;
4fc95e86	252	if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
a8f24a39 IM	253	nr_irq_read_unsafe++;
	254	if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
	255	nr_softirq_read_safe++;
4fc95e86	256	if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
a8f24a39 IM	257	nr_softirq_read_unsafe++;
	258	if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
	259	nr_hardirq_read_safe++;
4fc95e86	260	if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
a8f24a39 IM	261	nr_hardirq_read_unsafe++;
a8f24a39 IM	262
df60a844	263	#ifdef CONFIG_PROVE_LOCKING
419ca3f1	264	sum_forward_deps += lockdep_count_forward_deps(class);
df60a844	265	#endif
a8f24a39	266	}
501b9ebf	267	#ifdef CONFIG_DEBUG_LOCKDEP
bd6d29c2	268	DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
a8f24a39 IM	269	#endif
	270	seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
	271	nr_lock_classes, MAX_LOCKDEP_KEYS);
	272	seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
	273	nr_list_entries, MAX_LOCKDEP_ENTRIES);
	274	seq_printf(m, " indirect dependencies: %11lu\n",
	275	sum_forward_deps);
	276
	277	/*
	278	* Total number of dependencies:
	279	*
	280	* All irq-safe locks may nest inside irq-unsafe locks,
	281	* plus all the other known dependencies:
	282	*/
	283	seq_printf(m, " all direct dependencies: %11lu\n",
	284	nr_irq_unsafe * nr_irq_safe +
	285	nr_hardirq_unsafe * nr_hardirq_safe +
	286	nr_list_entries);
	287
8e18257d	288	#ifdef CONFIG_PROVE_LOCKING
a8f24a39 IM	289	seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
a8f24a39 IM	290	nr_lock_chains, MAX_LOCKDEP_CHAINS);
443cd507	291	seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
cd1a28e8	292	nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
8e18257d	293	#endif
a8f24a39 IM	294
	295	#ifdef CONFIG_TRACE_IRQFLAGS
	296	seq_printf(m, " in-hardirq chains: %11u\n",
	297	nr_hardirq_chains);
	298	seq_printf(m, " in-softirq chains: %11u\n",
	299	nr_softirq_chains);
	300	#endif
	301	seq_printf(m, " in-process chains: %11u\n",
	302	nr_process_chains);
	303	seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
	304	nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
	305	seq_printf(m, " combined max dependencies: %11u\n",
	306	(nr_hardirq_chains + 1) *
	307	(nr_softirq_chains + 1) *
	308	(nr_process_chains + 1)
	309	);
	310	seq_printf(m, " hardirq-safe locks: %11lu\n",
	311	nr_hardirq_safe);
	312	seq_printf(m, " hardirq-unsafe locks: %11lu\n",
	313	nr_hardirq_unsafe);
	314	seq_printf(m, " softirq-safe locks: %11lu\n",
	315	nr_softirq_safe);
	316	seq_printf(m, " softirq-unsafe locks: %11lu\n",
	317	nr_softirq_unsafe);
	318	seq_printf(m, " irq-safe locks: %11lu\n",
	319	nr_irq_safe);
	320	seq_printf(m, " irq-unsafe locks: %11lu\n",
	321	nr_irq_unsafe);
	322
	323	seq_printf(m, " hardirq-read-safe locks: %11lu\n",
	324	nr_hardirq_read_safe);
	325	seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
	326	nr_hardirq_read_unsafe);
	327	seq_printf(m, " softirq-read-safe locks: %11lu\n",
	328	nr_softirq_read_safe);
	329	seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
	330	nr_softirq_read_unsafe);
	331	seq_printf(m, " irq-read-safe locks: %11lu\n",
	332	nr_irq_read_safe);
	333	seq_printf(m, " irq-read-unsafe locks: %11lu\n",
	334	nr_irq_read_unsafe);
	335
	336	seq_printf(m, " uncategorized locks: %11lu\n",
	337	nr_uncategorized);
	338	seq_printf(m, " unused locks: %11lu\n",
	339	nr_unused);
	340	seq_printf(m, " max locking depth: %11u\n",
	341	max_lockdep_depth);
bbfa2622	342	#ifdef CONFIG_PROVE_LOCKING
12f3dfd0 ML	343	seq_printf(m, " max bfs queue depth: %11u\n",
12f3dfd0 ML	344	max_bfs_queue_depth);
bbfa2622	345	#endif
a8f24a39 IM	346	lockdep_stats_debug_show(m);
	347	seq_printf(m, " debug_locks: %11u\n",
	348	debug_locks);
	349
	350	return 0;
	351	}
	352
	353	static int lockdep_stats_open(struct inode inode, struct file file)
	354	{
	355	return single_open(file, lockdep_stats_show, NULL);
	356	}
	357
15ad7cdc	358	static const struct file_operations proc_lockdep_stats_operations = {
a8f24a39 IM	359	.open = lockdep_stats_open,
	360	.read = seq_read,
	361	.llseek = seq_lseek,
c0f33586	362	.release = single_release,
a8f24a39 IM	363	};
a8f24a39 IM	364
c46261de PZ	365	#ifdef CONFIG_LOCK_STAT
	366
	367	struct lock_stat_data {
	368	struct lock_class *class;
	369	struct lock_class_stats stats;
	370	};
	371
	372	struct lock_stat_seq {
c46261de PZ	373	struct lock_stat_data *iter_end;
	374	struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
	375	};
	376
	377	/*
	378	* sort on absolute number of contentions
	379	*/
	380	static int lock_stat_cmp(const void l, const void r)
	381	{
	382	const struct lock_stat_data dl = l, dr = r;
	383	unsigned long nl, nr;
	384
	385	nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
	386	nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
	387
	388	return nr - nl;
	389	}
	390
	391	static void seq_line(struct seq_file *m, char c, int offset, int length)
	392	{
	393	int i;
	394
	395	for (i = 0; i < offset; i++)
	396	seq_puts(m, " ");
	397	for (i = 0; i < length; i++)
	398	seq_printf(m, "%c", c);
	399	seq_puts(m, "\n");
	400	}
	401
	402	static void snprint_time(char *buf, size_t bufsiz, s64 nr)
	403	{
6918bc5c PZ	404	s64 div;
6918bc5c PZ	405	s32 rem;
c46261de	406
2189459d	407	nr += 5; /* for display rounding */
6918bc5c PZ	408	div = div_s64_rem(nr, 1000, &rem);
6918bc5c PZ	409	snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
c46261de PZ	410	}
	411
	412	static void seq_time(struct seq_file *m, s64 time)
	413	{
	414	char num[15];
	415
	416	snprint_time(num, sizeof(num), time);
	417	seq_printf(m, " %14s", num);
	418	}
	419
	420	static void seq_lock_time(struct seq_file m, struct lock_time lt)
	421	{
	422	seq_printf(m, "%14lu", lt->nr);
	423	seq_time(m, lt->min);
	424	seq_time(m, lt->max);
	425	seq_time(m, lt->total);
838cc7b4	426	seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
c46261de PZ	427	}
	428
	429	static void seq_stats(struct seq_file m, struct lock_stat_data data)
	430	{
cee34d88	431	struct lockdep_subclass_key *ckey;
c46261de	432	struct lock_class_stats *stats;
cee34d88 PZ	433	struct lock_class *class;
cee34d88 PZ	434	const char *cname;
c46261de	435	int i, namelen;
cee34d88	436	char name[39];
c46261de PZ	437
	438	class = data->class;
	439	stats = &data->stats;
	440
d38e1d5a PZ	441	namelen = 38;
	442	if (class->name_version > 1)
	443	namelen -= 2; /* XXX truncates versions > 9 */
	444	if (class->subclass)
	445	namelen -= 2;
	446
cee34d88 PZ	447	rcu_read_lock_sched();
	448	cname = rcu_dereference_sched(class->name);
	449	ckey = rcu_dereference_sched(class->key);
	450
	451	if (!cname && !ckey) {
	452	rcu_read_unlock_sched();
	453	return;
	454
	455	} else if (!cname) {
d38e1d5a PZ	456	char str[KSYM_NAME_LEN];
	457	const char *key_name;
	458
cee34d88	459	key_name = __get_key_name(ckey, str);
d38e1d5a PZ	460	snprintf(name, namelen, "%s", key_name);
d38e1d5a PZ	461	} else {
cee34d88	462	snprintf(name, namelen, "%s", cname);
d38e1d5a	463	}
cee34d88 PZ	464	rcu_read_unlock_sched();
cee34d88 PZ	465
c46261de	466	namelen = strlen(name);
d38e1d5a PZ	467	if (class->name_version > 1) {
	468	snprintf(name+namelen, 3, "#%d", class->name_version);
	469	namelen += 2;
	470	}
	471	if (class->subclass) {
	472	snprintf(name+namelen, 3, "/%d", class->subclass);
	473	namelen += 2;
	474	}
c46261de PZ	475
	476	if (stats->write_holdtime.nr) {
	477	if (stats->read_holdtime.nr)
	478	seq_printf(m, "%38s-W:", name);
	479	else
	480	seq_printf(m, "%40s:", name);
	481
96645678	482	seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
c46261de	483	seq_lock_time(m, &stats->write_waittime);
96645678	484	seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
c46261de PZ	485	seq_lock_time(m, &stats->write_holdtime);
	486	seq_puts(m, "\n");
	487	}
	488
	489	if (stats->read_holdtime.nr) {
	490	seq_printf(m, "%38s-R:", name);
96645678	491	seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
c46261de	492	seq_lock_time(m, &stats->read_waittime);
96645678	493	seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
c46261de PZ	494	seq_lock_time(m, &stats->read_holdtime);
	495	seq_puts(m, "\n");
	496	}
	497
	498	if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
	499	return;
	500
	501	if (stats->read_holdtime.nr)
	502	namelen += 2;
	503
c7e78cff	504	for (i = 0; i < LOCKSTAT_POINTS; i++) {
c46261de PZ	505	char ip[32];
	506
	507	if (class->contention_point[i] == 0)
	508	break;
	509
	510	if (!i)
	511	seq_line(m, '-', 40-namelen, namelen);
	512
c46261de PZ	513	snprintf(ip, sizeof(ip), "[<%p>]",
c46261de PZ	514	(void *)class->contention_point[i]);
3cf9b85b JP	515	seq_printf(m, "%40s %14lu %29s %pS\n",
	516	name, stats->contention_point[i],
	517	ip, (void *)class->contention_point[i]);
c46261de	518	}
c7e78cff	519	for (i = 0; i < LOCKSTAT_POINTS; i++) {
c7e78cff PZ	520	char ip[32];
	521
	522	if (class->contending_point[i] == 0)
	523	break;
	524
	525	if (!i)
	526	seq_line(m, '-', 40-namelen, namelen);
	527
c7e78cff PZ	528	snprintf(ip, sizeof(ip), "[<%p>]",
c7e78cff PZ	529	(void *)class->contending_point[i]);
3cf9b85b JP	530	seq_printf(m, "%40s %14lu %29s %pS\n",
	531	name, stats->contending_point[i],
	532	ip, (void *)class->contending_point[i]);
c7e78cff	533	}
c46261de PZ	534	if (i) {
c46261de PZ	535	seq_puts(m, "\n");
1232e380	536	seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
c46261de PZ	537	seq_puts(m, "\n");
	538	}
	539	}
	540
	541	static void seq_header(struct seq_file *m)
	542	{
1232e380	543	seq_puts(m, "lock_stat version 0.4\n");
9833f8cb PZ	544
	545	if (unlikely(!debug_locks))
	546	seq_printf(m, "WARNING lock debugging disabled!! - possibly due to a lockdep warning\n");
	547
1232e380 DB	548	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
1232e380 DB	549	seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
96645678	550	"%14s %14s\n",
c46261de	551	"class name",
96645678	552	"con-bounces",
c46261de PZ	553	"contentions",
	554	"waittime-min",
	555	"waittime-max",
	556	"waittime-total",
1232e380	557	"waittime-avg",
96645678	558	"acq-bounces",
c46261de PZ	559	"acquisitions",
	560	"holdtime-min",
	561	"holdtime-max",
1232e380 DB	562	"holdtime-total",
	563	"holdtime-avg");
	564	seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
c46261de PZ	565	seq_printf(m, "\n");
	566	}
	567
	568	static void ls_start(struct seq_file m, loff_t *pos)
	569	{
	570	struct lock_stat_seq *data = m->private;
96004bb2	571	struct lock_stat_data *iter;
c46261de	572
94c61c0a TP	573	if (*pos == 0)
94c61c0a TP	574	return SEQ_START_TOKEN;
c46261de	575
96004bb2 LZ	576	iter = data->stats + (*pos - 1);
	577	if (iter >= data->iter_end)
	578	iter = NULL;
4b32d0a4	579
96004bb2	580	return iter;
c46261de PZ	581	}
	582
	583	static void ls_next(struct seq_file m, void v, loff_t pos)
	584	{
c46261de	585	(*pos)++;
96004bb2	586	return ls_start(m, pos);
c46261de PZ	587	}
	588
	589	static void ls_stop(struct seq_file m, void v)
	590	{
	591	}
	592
	593	static int ls_show(struct seq_file m, void v)
	594	{
94c61c0a TP	595	if (v == SEQ_START_TOKEN)
	596	seq_header(m);
	597	else
	598	seq_stats(m, v);
c46261de	599
c46261de PZ	600	return 0;
	601	}
	602
88e9d34c	603	static const struct seq_operations lockstat_ops = {
c46261de PZ	604	.start = ls_start,
	605	.next = ls_next,
	606	.stop = ls_stop,
	607	.show = ls_show,
	608	};
	609
	610	static int lock_stat_open(struct inode inode, struct file file)
	611	{
	612	int res;
	613	struct lock_class *class;
	614	struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
	615
	616	if (!data)
	617	return -ENOMEM;
	618
	619	res = seq_open(file, &lockstat_ops);
	620	if (!res) {
	621	struct lock_stat_data *iter = data->stats;
	622	struct seq_file *m = file->private_data;
	623
c46261de PZ	624	list_for_each_entry(class, &all_lock_classes, lock_entry) {
	625	iter->class = class;
	626	iter->stats = lock_stats(class);
	627	iter++;
	628	}
	629	data->iter_end = iter;
	630
96004bb2	631	sort(data->stats, data->iter_end - data->stats,
c46261de PZ	632	sizeof(struct lock_stat_data),
	633	lock_stat_cmp, NULL);
	634
	635	m->private = data;
	636	} else
	637	vfree(data);
	638
	639	return res;
	640	}
	641
	642	static ssize_t lock_stat_write(struct file file, const char __user buf,
	643	size_t count, loff_t *ppos)
	644	{
	645	struct lock_class *class;
	646	char c;
	647
	648	if (count) {
	649	if (get_user(c, buf))
	650	return -EFAULT;
	651
	652	if (c != '0')
	653	return count;
	654
	655	list_for_each_entry(class, &all_lock_classes, lock_entry)
	656	clear_lock_stats(class);
	657	}
	658	return count;
	659	}
	660
	661	static int lock_stat_release(struct inode inode, struct file file)
	662	{
	663	struct seq_file *seq = file->private_data;
	664
	665	vfree(seq->private);
c46261de PZ	666	return seq_release(inode, file);
	667	}
	668
	669	static const struct file_operations proc_lock_stat_operations = {
	670	.open = lock_stat_open,
	671	.write = lock_stat_write,
	672	.read = seq_read,
	673	.llseek = seq_lseek,
	674	.release = lock_stat_release,
	675	};
	676	#endif /* CONFIG_LOCK_STAT */
	677
a8f24a39 IM	678	static int __init lockdep_proc_init(void)
a8f24a39 IM	679	{
c33fff0a	680	proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
cd1a28e8	681	#ifdef CONFIG_PROVE_LOCKING
443cd507 HY	682	proc_create("lockdep_chains", S_IRUSR, NULL,
443cd507 HY	683	&proc_lockdep_chains_operations);
cd1a28e8	684	#endif
c33fff0a DL	685	proc_create("lockdep_stats", S_IRUSR, NULL,
c33fff0a DL	686	&proc_lockdep_stats_operations);
a8f24a39	687
c46261de	688	#ifdef CONFIG_LOCK_STAT
9795447f LZ	689	proc_create("lock_stat", S_IRUSR \| S_IWUSR, NULL,
9795447f LZ	690	&proc_lock_stat_operations);
c46261de PZ	691	#endif
c46261de PZ	692
a8f24a39 IM	693	return 0;
	694	}
	695
	696	__initcall(lockdep_proc_init);
	697