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/* Copyright (c) 2016-2017 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __STORM_WATCH_H
#define __STORM_WATCH_H
#include <linux/ktime.h>
#include <linux/mutex.h>
/**
* Data used to track an event storm.
*
* @storm_period_ms: The maximum time interval between two events. If this limit
* is exceeded then the event chain will be broken and removed
* from consideration for a storm.
* @max_storm_count: The number of chained events required to trigger a storm.
* @storm_count: The current number of chained events.
* @last_kt: Kernel time of the last event seen.
* @storm_lock: Mutex lock to protect storm_watch data.
*/
struct storm_watch {
bool enabled;
int storm_period_ms;
int max_storm_count;
int storm_count;
ktime_t last_kt;
struct mutex storm_lock;
};
bool is_storming(struct storm_watch *data);
void reset_storm_count(struct storm_watch *data);
void update_storm_count(struct storm_watch *data, int max_count);
#endif
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