[net-next-2.6.git] / kernel / 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 <pzijlstr@redhat.com>
 *
 * Code for /proc/lockdep and /proc/lockdep_stats:
 *
 */
#include <linux/module.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 <asm/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[128];
	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) {
		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 int 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:           %11u\n",
		debug_atomic_read(&chain_lookup_misses));
	seq_printf(m, " chain lookup hits:             %11u\n",
		debug_atomic_read(&chain_lookup_hits));
	seq_printf(m, " cyclic checks:                 %11u\n",
		debug_atomic_read(&nr_cyclic_checks));
	seq_printf(m, " cyclic-check recursions:       %11u\n",
		debug_atomic_read(&nr_cyclic_check_recursions));
	seq_printf(m, " find-mask forwards checks:     %11u\n",
		debug_atomic_read(&nr_find_usage_forwards_checks));
	seq_printf(m, " find-mask forwards recursions: %11u\n",
		debug_atomic_read(&nr_find_usage_forwards_recursions));
	seq_printf(m, " find-mask backwards checks:    %11u\n",
		debug_atomic_read(&nr_find_usage_backwards_checks));
	seq_printf(m, " find-mask backwards recursions:%11u\n",
		debug_atomic_read(&nr_find_usage_backwards_recursions));

	seq_printf(m, " hardirq on events:             %11u\n", hi1);
	seq_printf(m, " hardirq off events:            %11u\n", hi2);
	seq_printf(m, " redundant hardirq ons:         %11u\n", hr1);
	seq_printf(m, " redundant hardirq offs:        %11u\n", hr2);
	seq_printf(m, " softirq on events:             %11u\n", si1);
	seq_printf(m, " softirq off events:            %11u\n", si2);
	seq_printf(m, " redundant softirq ons:         %11u\n", sr1);
	seq_printf(m, " redundant softirq offs:        %11u\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, factor = 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);

	/*
	 * Estimated factor between direct and indirect
	 * dependencies:
	 */
	if (nr_list_entries)
		factor = sum_forward_deps / 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);
	seq_printf(m, " max recursion depth:           %11u\n",
			max_recursion_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;
	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);
}

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

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

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

	if (!class->name) {
		char str[KSYM_NAME_LEN];
		const char *key_name;

		key_name = __get_key_name(class->key, str);
		snprintf(name, namelen, "%s", key_name);
	} else {
		snprintf(name, namelen, "%s", class->name);
	}
	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 sym[KSYM_SYMBOL_LEN];
		char ip[32];

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

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

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

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

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

		sprint_symbol(sym, class->contending_point[i]);
		snprintf(ip, sizeof(ip), "[<%p>]",
				(void *)class->contending_point[i]);
		seq_printf(m, "%40s %14lu %29s %s\n", name,
				stats->contending_point[i],
				ip, sym);
	}
	if (i) {
		seq_puts(m, "\n");
		seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1));
		seq_puts(m, "\n");
	}
}

static void seq_header(struct seq_file *m)
{
	seq_printf(m, "lock_stat version 0.3\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 + 10 * (14 + 1));
	seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
			"%14s %14s\n",
			"class name",
			"con-bounces",
			"contentions",
			"waittime-min",
			"waittime-max",
			"waittime-total",
			"acq-bounces",
			"acquisitions",
			"holdtime-min",
			"holdtime-max",
			"holdtime-total");
	seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
	seq_printf(m, "\n");
}

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

	if (*pos == 0)
		return SEQ_START_TOKEN;

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

	return data->iter;
}

static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct lock_stat_seq *data = m->private;

	(*pos)++;

	if (v == SEQ_START_TOKEN)
		data->iter = data->stats;
	else {
		data->iter = v;
		data->iter++;
	}

	if (data->iter == data->iter_end)
		data->iter = NULL;

	return data->iter;
}

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 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;

		data->iter = iter;
		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->iter,
				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);
	seq->private = NULL;
	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, 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 PZ	8	* Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
4b32d0a4 PZ	9	* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
a8f24a39 IM	10	*
	11	* Code for /proc/lockdep and /proc/lockdep_stats:
	12	*
	13	*/
a8f24a39 IM	14	#include <linux/module.h>
	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>
	20	#include <linux/sort.h>
	21	#include <asm/uaccess.h>
	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)
	41	{
	42	char str[128];
	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) {
	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);
8bfe0298 RV	152	if (!class->key)
	153	continue;
	154
443cd507 HY	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	{
12aac19d	173	return seq_open(file, &lockdep_chains_ops);
443cd507 HY	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	};
cd1a28e8	182	#endif /* CONFIG_PROVE_LOCKING */
443cd507	183
a8f24a39 IM	184	static void lockdep_stats_debug_show(struct seq_file *m)
	185	{
	186	#ifdef CONFIG_DEBUG_LOCKDEP
	187	unsigned int 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: %11u\n",
	197	debug_atomic_read(&chain_lookup_misses));
	198	seq_printf(m, " chain lookup hits: %11u\n",
	199	debug_atomic_read(&chain_lookup_hits));
	200	seq_printf(m, " cyclic checks: %11u\n",
	201	debug_atomic_read(&nr_cyclic_checks));
	202	seq_printf(m, " cyclic-check recursions: %11u\n",
	203	debug_atomic_read(&nr_cyclic_check_recursions));
	204	seq_printf(m, " find-mask forwards checks: %11u\n",
	205	debug_atomic_read(&nr_find_usage_forwards_checks));
	206	seq_printf(m, " find-mask forwards recursions: %11u\n",
	207	debug_atomic_read(&nr_find_usage_forwards_recursions));
	208	seq_printf(m, " find-mask backwards checks: %11u\n",
	209	debug_atomic_read(&nr_find_usage_backwards_checks));
	210	seq_printf(m, " find-mask backwards recursions:%11u\n",
	211	debug_atomic_read(&nr_find_usage_backwards_recursions));
	212
	213	seq_printf(m, " hardirq on events: %11u\n", hi1);
	214	seq_printf(m, " hardirq off events: %11u\n", hi2);
	215	seq_printf(m, " redundant hardirq ons: %11u\n", hr1);
	216	seq_printf(m, " redundant hardirq offs: %11u\n", hr2);
	217	seq_printf(m, " softirq on events: %11u\n", si1);
	218	seq_printf(m, " softirq off events: %11u\n", si2);
	219	seq_printf(m, " redundant softirq ons: %11u\n", sr1);
	220	seq_printf(m, " redundant softirq offs: %11u\n", sr2);
	221	#endif
	222	}
	223
	224	static int lockdep_stats_show(struct seq_file m, void v)
	225	{
	226	struct lock_class *class;
	227	unsigned long nr_unused = 0, nr_uncategorized = 0,
	228	nr_irq_safe = 0, nr_irq_unsafe = 0,
	229	nr_softirq_safe = 0, nr_softirq_unsafe = 0,
	230	nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
	231	nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
	232	nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
	233	nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
	234	sum_forward_deps = 0, factor = 0;
	235
	236	list_for_each_entry(class, &all_lock_classes, lock_entry) {
	237
	238	if (class->usage_mask == 0)
	239	nr_unused++;
	240	if (class->usage_mask == LOCKF_USED)
	241	nr_uncategorized++;
	242	if (class->usage_mask & LOCKF_USED_IN_IRQ)
	243	nr_irq_safe++;
4fc95e86	244	if (class->usage_mask & LOCKF_ENABLED_IRQ)
a8f24a39 IM	245	nr_irq_unsafe++;
	246	if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
	247	nr_softirq_safe++;
4fc95e86	248	if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
a8f24a39 IM	249	nr_softirq_unsafe++;
	250	if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
	251	nr_hardirq_safe++;
4fc95e86	252	if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
a8f24a39 IM	253	nr_hardirq_unsafe++;
	254	if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
	255	nr_irq_read_safe++;
4fc95e86	256	if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
a8f24a39 IM	257	nr_irq_read_unsafe++;
	258	if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
	259	nr_softirq_read_safe++;
4fc95e86	260	if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
a8f24a39 IM	261	nr_softirq_read_unsafe++;
	262	if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
	263	nr_hardirq_read_safe++;
4fc95e86	264	if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
a8f24a39 IM	265	nr_hardirq_read_unsafe++;
a8f24a39 IM	266
df60a844	267	#ifdef CONFIG_PROVE_LOCKING
419ca3f1	268	sum_forward_deps += lockdep_count_forward_deps(class);
df60a844	269	#endif
a8f24a39	270	}
501b9ebf	271	#ifdef CONFIG_DEBUG_LOCKDEP
a8f24a39 IM	272	DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused);
	273	#endif
	274	seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
	275	nr_lock_classes, MAX_LOCKDEP_KEYS);
	276	seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
	277	nr_list_entries, MAX_LOCKDEP_ENTRIES);
	278	seq_printf(m, " indirect dependencies: %11lu\n",
	279	sum_forward_deps);
	280
	281	/*
	282	* Total number of dependencies:
	283	*
	284	* All irq-safe locks may nest inside irq-unsafe locks,
	285	* plus all the other known dependencies:
	286	*/
	287	seq_printf(m, " all direct dependencies: %11lu\n",
	288	nr_irq_unsafe * nr_irq_safe +
	289	nr_hardirq_unsafe * nr_hardirq_safe +
	290	nr_list_entries);
	291
	292	/*
	293	* Estimated factor between direct and indirect
	294	* dependencies:
	295	*/
	296	if (nr_list_entries)
	297	factor = sum_forward_deps / nr_list_entries;
	298
8e18257d	299	#ifdef CONFIG_PROVE_LOCKING
a8f24a39 IM	300	seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
a8f24a39 IM	301	nr_lock_chains, MAX_LOCKDEP_CHAINS);
443cd507	302	seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
cd1a28e8	303	nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
8e18257d	304	#endif
a8f24a39 IM	305
	306	#ifdef CONFIG_TRACE_IRQFLAGS
	307	seq_printf(m, " in-hardirq chains: %11u\n",
	308	nr_hardirq_chains);
	309	seq_printf(m, " in-softirq chains: %11u\n",
	310	nr_softirq_chains);
	311	#endif
	312	seq_printf(m, " in-process chains: %11u\n",
	313	nr_process_chains);
	314	seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
	315	nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
	316	seq_printf(m, " combined max dependencies: %11u\n",
	317	(nr_hardirq_chains + 1) *
	318	(nr_softirq_chains + 1) *
	319	(nr_process_chains + 1)
	320	);
	321	seq_printf(m, " hardirq-safe locks: %11lu\n",
	322	nr_hardirq_safe);
	323	seq_printf(m, " hardirq-unsafe locks: %11lu\n",
	324	nr_hardirq_unsafe);
	325	seq_printf(m, " softirq-safe locks: %11lu\n",
	326	nr_softirq_safe);
	327	seq_printf(m, " softirq-unsafe locks: %11lu\n",
	328	nr_softirq_unsafe);
	329	seq_printf(m, " irq-safe locks: %11lu\n",
	330	nr_irq_safe);
	331	seq_printf(m, " irq-unsafe locks: %11lu\n",
	332	nr_irq_unsafe);
	333
	334	seq_printf(m, " hardirq-read-safe locks: %11lu\n",
	335	nr_hardirq_read_safe);
	336	seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
	337	nr_hardirq_read_unsafe);
	338	seq_printf(m, " softirq-read-safe locks: %11lu\n",
	339	nr_softirq_read_safe);
	340	seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
	341	nr_softirq_read_unsafe);
	342	seq_printf(m, " irq-read-safe locks: %11lu\n",
	343	nr_irq_read_safe);
	344	seq_printf(m, " irq-read-unsafe locks: %11lu\n",
	345	nr_irq_read_unsafe);
	346
	347	seq_printf(m, " uncategorized locks: %11lu\n",
	348	nr_uncategorized);
	349	seq_printf(m, " unused locks: %11lu\n",
	350	nr_unused);
	351	seq_printf(m, " max locking depth: %11u\n",
	352	max_lockdep_depth);
	353	seq_printf(m, " max recursion depth: %11u\n",
	354	max_recursion_depth);
bbfa2622	355	#ifdef CONFIG_PROVE_LOCKING
12f3dfd0 ML	356	seq_printf(m, " max bfs queue depth: %11u\n",
12f3dfd0 ML	357	max_bfs_queue_depth);
bbfa2622	358	#endif
a8f24a39 IM	359	lockdep_stats_debug_show(m);
	360	seq_printf(m, " debug_locks: %11u\n",
	361	debug_locks);
	362
	363	return 0;
	364	}
	365
	366	static int lockdep_stats_open(struct inode inode, struct file file)
	367	{
	368	return single_open(file, lockdep_stats_show, NULL);
	369	}
	370
15ad7cdc	371	static const struct file_operations proc_lockdep_stats_operations = {
a8f24a39 IM	372	.open = lockdep_stats_open,
	373	.read = seq_read,
	374	.llseek = seq_lseek,
c0f33586	375	.release = single_release,
a8f24a39 IM	376	};
a8f24a39 IM	377
c46261de PZ	378	#ifdef CONFIG_LOCK_STAT
	379
	380	struct lock_stat_data {
	381	struct lock_class *class;
	382	struct lock_class_stats stats;
	383	};
	384
	385	struct lock_stat_seq {
	386	struct lock_stat_data *iter;
	387	struct lock_stat_data *iter_end;
	388	struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
	389	};
	390
	391	/*
	392	* sort on absolute number of contentions
	393	*/
	394	static int lock_stat_cmp(const void l, const void r)
	395	{
	396	const struct lock_stat_data dl = l, dr = r;
	397	unsigned long nl, nr;
	398
	399	nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
	400	nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
	401
	402	return nr - nl;
	403	}
	404
	405	static void seq_line(struct seq_file *m, char c, int offset, int length)
	406	{
	407	int i;
	408
	409	for (i = 0; i < offset; i++)
	410	seq_puts(m, " ");
	411	for (i = 0; i < length; i++)
	412	seq_printf(m, "%c", c);
	413	seq_puts(m, "\n");
	414	}
	415
	416	static void snprint_time(char *buf, size_t bufsiz, s64 nr)
	417	{
6918bc5c PZ	418	s64 div;
6918bc5c PZ	419	s32 rem;
c46261de	420
2189459d	421	nr += 5; /* for display rounding */
6918bc5c PZ	422	div = div_s64_rem(nr, 1000, &rem);
6918bc5c PZ	423	snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
c46261de PZ	424	}
	425
	426	static void seq_time(struct seq_file *m, s64 time)
	427	{
	428	char num[15];
	429
	430	snprint_time(num, sizeof(num), time);
	431	seq_printf(m, " %14s", num);
	432	}
	433
	434	static void seq_lock_time(struct seq_file m, struct lock_time lt)
	435	{
	436	seq_printf(m, "%14lu", lt->nr);
	437	seq_time(m, lt->min);
	438	seq_time(m, lt->max);
	439	seq_time(m, lt->total);
	440	}
	441
	442	static void seq_stats(struct seq_file m, struct lock_stat_data data)
	443	{
	444	char name[39];
	445	struct lock_class *class;
	446	struct lock_class_stats *stats;
	447	int i, namelen;
	448
	449	class = data->class;
	450	stats = &data->stats;
	451
d38e1d5a PZ	452	namelen = 38;
	453	if (class->name_version > 1)
	454	namelen -= 2; /* XXX truncates versions > 9 */
	455	if (class->subclass)
	456	namelen -= 2;
	457
	458	if (!class->name) {
	459	char str[KSYM_NAME_LEN];
	460	const char *key_name;
	461
	462	key_name = __get_key_name(class->key, str);
	463	snprintf(name, namelen, "%s", key_name);
	464	} else {
	465	snprintf(name, namelen, "%s", class->name);
	466	}
c46261de	467	namelen = strlen(name);
d38e1d5a PZ	468	if (class->name_version > 1) {
	469	snprintf(name+namelen, 3, "#%d", class->name_version);
	470	namelen += 2;
	471	}
	472	if (class->subclass) {
	473	snprintf(name+namelen, 3, "/%d", class->subclass);
	474	namelen += 2;
	475	}
c46261de PZ	476
	477	if (stats->write_holdtime.nr) {
	478	if (stats->read_holdtime.nr)
	479	seq_printf(m, "%38s-W:", name);
	480	else
	481	seq_printf(m, "%40s:", name);
	482
96645678	483	seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
c46261de	484	seq_lock_time(m, &stats->write_waittime);
96645678	485	seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
c46261de PZ	486	seq_lock_time(m, &stats->write_holdtime);
	487	seq_puts(m, "\n");
	488	}
	489
	490	if (stats->read_holdtime.nr) {
	491	seq_printf(m, "%38s-R:", name);
96645678	492	seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
c46261de	493	seq_lock_time(m, &stats->read_waittime);
96645678	494	seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
c46261de PZ	495	seq_lock_time(m, &stats->read_holdtime);
	496	seq_puts(m, "\n");
	497	}
	498
	499	if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
	500	return;
	501
	502	if (stats->read_holdtime.nr)
	503	namelen += 2;
	504
c7e78cff	505	for (i = 0; i < LOCKSTAT_POINTS; i++) {
c46261de PZ	506	char sym[KSYM_SYMBOL_LEN];
	507	char ip[32];
	508
	509	if (class->contention_point[i] == 0)
	510	break;
	511
	512	if (!i)
	513	seq_line(m, '-', 40-namelen, namelen);
	514
	515	sprint_symbol(sym, class->contention_point[i]);
	516	snprintf(ip, sizeof(ip), "[<%p>]",
	517	(void *)class->contention_point[i]);
	518	seq_printf(m, "%40s %14lu %29s %s\n", name,
	519	stats->contention_point[i],
	520	ip, sym);
	521	}
c7e78cff PZ	522	for (i = 0; i < LOCKSTAT_POINTS; i++) {
	523	char sym[KSYM_SYMBOL_LEN];
	524	char ip[32];
	525
	526	if (class->contending_point[i] == 0)
	527	break;
	528
	529	if (!i)
	530	seq_line(m, '-', 40-namelen, namelen);
	531
	532	sprint_symbol(sym, class->contending_point[i]);
	533	snprintf(ip, sizeof(ip), "[<%p>]",
	534	(void *)class->contending_point[i]);
	535	seq_printf(m, "%40s %14lu %29s %s\n", name,
	536	stats->contending_point[i],
	537	ip, sym);
	538	}
c46261de PZ	539	if (i) {
c46261de PZ	540	seq_puts(m, "\n");
96645678	541	seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1));
c46261de PZ	542	seq_puts(m, "\n");
	543	}
	544	}
	545
	546	static void seq_header(struct seq_file *m)
	547	{
c7e78cff	548	seq_printf(m, "lock_stat version 0.3\n");
9833f8cb PZ	549
	550	if (unlikely(!debug_locks))
	551	seq_printf(m, "WARNING lock debugging disabled!! - possibly due to a lockdep warning\n");
	552
96645678 PZ	553	seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
	554	seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
	555	"%14s %14s\n",
c46261de	556	"class name",
96645678	557	"con-bounces",
c46261de PZ	558	"contentions",
	559	"waittime-min",
	560	"waittime-max",
	561	"waittime-total",
96645678	562	"acq-bounces",
c46261de PZ	563	"acquisitions",
	564	"holdtime-min",
	565	"holdtime-max",
	566	"holdtime-total");
96645678	567	seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
c46261de PZ	568	seq_printf(m, "\n");
	569	}
	570
	571	static void ls_start(struct seq_file m, loff_t *pos)
	572	{
	573	struct lock_stat_seq *data = m->private;
	574
94c61c0a TP	575	if (*pos == 0)
94c61c0a TP	576	return SEQ_START_TOKEN;
c46261de	577
21227434	578	data->iter = data->stats + (*pos - 1);
94c61c0a	579	if (data->iter >= data->iter_end)
4b32d0a4 PZ	580	data->iter = NULL;
4b32d0a4 PZ	581
c46261de PZ	582	return data->iter;
	583	}
	584
	585	static void ls_next(struct seq_file m, void v, loff_t pos)
	586	{
	587	struct lock_stat_seq *data = m->private;
	588
	589	(*pos)++;
	590
94c61c0a TP	591	if (v == SEQ_START_TOKEN)
	592	data->iter = data->stats;
	593	else {
	594	data->iter = v;
	595	data->iter++;
	596	}
	597
c46261de PZ	598	if (data->iter == data->iter_end)
	599	data->iter = NULL;
	600
	601	return data->iter;
	602	}
	603
	604	static void ls_stop(struct seq_file m, void v)
	605	{
	606	}
	607
	608	static int ls_show(struct seq_file m, void v)
	609	{
94c61c0a TP	610	if (v == SEQ_START_TOKEN)
	611	seq_header(m);
	612	else
	613	seq_stats(m, v);
c46261de	614
c46261de PZ	615	return 0;
	616	}
	617
	618	static struct seq_operations lockstat_ops = {
	619	.start = ls_start,
	620	.next = ls_next,
	621	.stop = ls_stop,
	622	.show = ls_show,
	623	};
	624
	625	static int lock_stat_open(struct inode inode, struct file file)
	626	{
	627	int res;
	628	struct lock_class *class;
	629	struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
	630
	631	if (!data)
	632	return -ENOMEM;
	633
	634	res = seq_open(file, &lockstat_ops);
	635	if (!res) {
	636	struct lock_stat_data *iter = data->stats;
	637	struct seq_file *m = file->private_data;
	638
	639	data->iter = iter;
	640	list_for_each_entry(class, &all_lock_classes, lock_entry) {
	641	iter->class = class;
	642	iter->stats = lock_stats(class);
	643	iter++;
	644	}
	645	data->iter_end = iter;
	646
	647	sort(data->stats, data->iter_end - data->iter,
	648	sizeof(struct lock_stat_data),
	649	lock_stat_cmp, NULL);
	650
	651	m->private = data;
	652	} else
	653	vfree(data);
	654
	655	return res;
	656	}
	657
	658	static ssize_t lock_stat_write(struct file file, const char __user buf,
	659	size_t count, loff_t *ppos)
	660	{
	661	struct lock_class *class;
	662	char c;
	663
	664	if (count) {
	665	if (get_user(c, buf))
	666	return -EFAULT;
	667
	668	if (c != '0')
	669	return count;
	670
	671	list_for_each_entry(class, &all_lock_classes, lock_entry)
	672	clear_lock_stats(class);
	673	}
	674	return count;
	675	}
	676
	677	static int lock_stat_release(struct inode inode, struct file file)
	678	{
679	struct seq_file *seq = file->private_data;
680
681	vfree(seq->private);
682	seq->private = NULL;
683	return seq_release(inode, file);
684	}
685
686	static const struct file_operations proc_lock_stat_operations = {
687	.open = lock_stat_open,
688	.write = lock_stat_write,
689	.read = seq_read,
690	.llseek = seq_lseek,
691	.release = lock_stat_release,
692	};
693	#endif /* CONFIG_LOCK_STAT */
694
a8f24a39 IM	695	static int __init lockdep_proc_init(void)
a8f24a39 IM	696	{
c33fff0a	697	proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
cd1a28e8	698	#ifdef CONFIG_PROVE_LOCKING
443cd507 HY	699	proc_create("lockdep_chains", S_IRUSR, NULL,
443cd507 HY	700	&proc_lockdep_chains_operations);
cd1a28e8	701	#endif
c33fff0a DL	702	proc_create("lockdep_stats", S_IRUSR, NULL,
c33fff0a DL	703	&proc_lockdep_stats_operations);
a8f24a39	704
c46261de	705	#ifdef CONFIG_LOCK_STAT
c33fff0a	706	proc_create("lock_stat", S_IRUSR, NULL, &proc_lock_stat_operations);
c46261de PZ	707	#endif
c46261de PZ	708
a8f24a39 IM	709	return 0;
	710	}
	711
	712	__initcall(lockdep_proc_init);
	713