a673075611
Change-Id: I8287072c88de5b8d754617c0d72b2a70aee33d10 Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015-2017, 2019-2020, The Linux Foundation. All rights reserved.
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*/
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#ifndef _GOVERNOR_MEMLAT_H
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#define _GOVERNOR_MEMLAT_H
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#include <linux/kernel.h>
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#include <linux/devfreq.h>
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/**
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* struct dev_stats - Device stats
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* @inst_count: Number of instructions executed.
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* @mem_count: Number of memory accesses made.
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* @freq: Effective frequency of the device in the
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* last interval.
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* @wb_pct: The ratio of writebacks to accesses. Used as an
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* indirect way to identify memory latency due to
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* snoop activity.
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*/
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struct dev_stats {
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int id;
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unsigned long inst_count;
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unsigned long mem_count;
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unsigned long freq;
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unsigned long stall_pct;
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unsigned long wb_pct;
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};
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struct core_dev_map {
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unsigned int core_mhz;
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unsigned int target_freq;
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};
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/**
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* struct memlat_hwmon - Memory Latency HW monitor info
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* @start_hwmon: Start the HW monitoring
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* @stop_hwmon: Stop the HW monitoring
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* @get_cnt: Return the number of intructions executed,
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* memory accesses and effective frequency
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* @dev: Pointer to device that this HW monitor can
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* monitor.
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* @of_node: OF node of device that this HW monitor can
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* monitor.
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* @df: Devfreq node that this HW monitor is being
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* used for. NULL when not actively in use and
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* non-NULL when in use.
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* @num_cores: Number of cores that are monitored by the
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* hardware monitor.
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* @core_stats: Array containing instruction count, memory
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* accesses and effective frequency for each core.
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*
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* One of dev or of_node needs to be specified for a successful registration.
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*
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*/
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struct memlat_hwmon {
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int (*start_hwmon)(struct memlat_hwmon *hw);
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void (*stop_hwmon)(struct memlat_hwmon *hw);
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unsigned long (*get_cnt)(struct memlat_hwmon *hw);
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struct device_node *(*get_child_of_node)(struct device *dev);
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void (*request_update_ms)(struct memlat_hwmon *hw,
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unsigned int update_ms);
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struct device *dev;
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struct device_node *of_node;
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unsigned int num_cores;
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struct dev_stats *core_stats;
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struct devfreq *df;
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struct core_dev_map *freq_map;
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bool should_ignore_df_monitor;
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};
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#if IS_ENABLED(CONFIG_DEVFREQ_GOV_MEMLAT)
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int register_memlat(struct device *dev, struct memlat_hwmon *hw);
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int register_compute(struct device *dev, struct memlat_hwmon *hw);
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int update_memlat(struct memlat_hwmon *hw);
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#else
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static inline int register_memlat(struct device *dev,
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struct memlat_hwmon *hw)
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{
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return 0;
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}
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static inline int register_compute(struct device *dev,
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struct memlat_hwmon *hw)
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{
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return 0;
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}
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static inline int update_memlat(struct memlat_hwmon *hw)
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{
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return 0;
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}
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#endif
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#endif /* _GOVERNOR_BW_HWMON_H */
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