3087c5f20d
Add a core to memory frequency mapping table, which establishes a relationship between the core frequency and its corresponding bandwidth vote. The governor expects a "qcom,core-dev-table" table as part of a given memlat hardware monitor's device tree node. This table is read upon registration of the memlat governor. The table is then used to determine the memory bandwidth vote corresponding to the maximum of the core frequencies. CRs-Fixed: 1054146 Change-Id: I9df118da1433125b02c937bf1799a0944b110fac Signed-off-by: Rohit Gupta <rohgup@codeaurora.org> Signed-off-by: David Keitel <dkeitel@codeaurora.org> Suggested-by: Saravana Kannan <skannan@codeaurora.org>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _GOVERNOR_BW_HWMON_H
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#define _GOVERNOR_BW_HWMON_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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*/
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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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};
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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 *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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};
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#ifdef CONFIG_DEVFREQ_GOV_MEMLAT
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int register_memlat(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 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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