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