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/*
* Copyright (c) 2015-2016, 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 _GOVERNOR_BW_HWMON_H
#define _GOVERNOR_BW_HWMON_H
#include <linux/kernel.h>
#include <linux/devfreq.h>
/**
* struct dev_stats - Device stats
* @inst_count: Number of instructions executed.
* @mem_count: Number of memory accesses made.
* @freq: Effective frequency of the device in the
* last interval.
*/
struct dev_stats {
int id;
unsigned long inst_count;
unsigned long mem_count;
unsigned long freq;
};
struct core_dev_map {
unsigned int core_mhz;
unsigned int target_freq;
};
/**
* struct memlat_hwmon - Memory Latency HW monitor info
* @start_hwmon: Start the HW monitoring
* @stop_hwmon: Stop the HW monitoring
* @get_cnt: Return the number of intructions executed,
* memory accesses and effective frequency
* @dev: Pointer to device that this HW monitor can
* monitor.
* @of_node: OF node of device that this HW monitor can
* monitor.
* @df: Devfreq node that this HW monitor is being
* used for. NULL when not actively in use and
* non-NULL when in use.
* @num_cores: Number of cores that are monitored by the
* hardware monitor.
* @core_stats: Array containing instruction count, memory
* accesses and effective frequency for each core.
*
* One of dev or of_node needs to be specified for a successful registration.
*
*/
struct memlat_hwmon {
int (*start_hwmon)(struct memlat_hwmon *hw);
void (*stop_hwmon)(struct memlat_hwmon *hw);
unsigned long (*get_cnt)(struct memlat_hwmon *hw);
struct device *dev;
struct device_node *of_node;
unsigned int num_cores;
struct dev_stats *core_stats;
struct devfreq *df;
struct core_dev_map *freq_map;
};
#ifdef CONFIG_DEVFREQ_GOV_MEMLAT
int register_memlat(struct device *dev, struct memlat_hwmon *hw);
int update_memlat(struct memlat_hwmon *hw);
#else
static inline int register_memlat(struct device *dev,
struct memlat_hwmon *hw)
{
return 0;
}
static inline int update_memlat(struct memlat_hwmon *hw)
{
return 0;
}
#endif
#endif /* _GOVERNOR_BW_HWMON_H */
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