1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * Authors: Waiman Long <longman@redhat.com>
14 */
15
16#ifndef __LOCKING_LOCK_EVENTS_H
17#define __LOCKING_LOCK_EVENTS_H
18
19enum lock_events {
20
21#include "lock_events_list.h"
22
23 lockevent_num, /* Total number of lock event counts */
24 LOCKEVENT_reset_cnts = lockevent_num,
25};
26
27#ifdef CONFIG_LOCK_EVENT_COUNTS
28/*
29 * Per-cpu counters
30 */
31DECLARE_PER_CPU(unsigned long, lockevents[lockevent_num]);
32
33/*
34 * Increment the statistical counters. use raw_cpu_inc() because of lower
35 * overhead and we don't care if we loose the occasional update.
36 */
37static inline void __lockevent_inc(enum lock_events event, bool cond)
38{
39 if (cond)
40 raw_cpu_inc(lockevents[event]);
41}
42
43#define lockevent_inc(ev) __lockevent_inc(LOCKEVENT_ ##ev, true)
44#define lockevent_cond_inc(ev, c) __lockevent_inc(LOCKEVENT_ ##ev, c)
45
46static inline void __lockevent_add(enum lock_events event, int inc)
47{
48 raw_cpu_add(lockevents[event], inc);
49}
50
51#define lockevent_add(ev, c) __lockevent_add(LOCKEVENT_ ##ev, c)
52
53#else /* CONFIG_LOCK_EVENT_COUNTS */
54
55#define lockevent_inc(ev)
56#define lockevent_add(ev, c) do { (void)(c); } while (0)
57#define lockevent_cond_inc(ev, c) do { (void)(c); } while (0)
58
59#endif /* CONFIG_LOCK_EVENT_COUNTS */
60
61ssize_t lockevent_read(struct file *file, char __user *user_buf,
62 size_t count, loff_t *ppos);
63
64#endif /* __LOCKING_LOCK_EVENTS_H */
65