a4f342b960
The Energy Model (EM) framework provides an API to let drivers register the active power of CPUs. The drivers are expected to provide a callback method which estimates the power consumed by a CPU at each available performance levels. How exactly this should be implemented, however, depends on the platform. On some systems, PM_OPP knows the voltage and frequency at which CPUs can run. When coupled with the CPU 'capacitance' (as provided by the 'dynamic-power-coefficient' devicetree binding), it is possible to estimate the dynamic power consumption of a CPU as P = C * V^2 * f, with C its capacitance and V and f respectively the voltage and frequency of the OPP. The Intelligent Power Allocator (IPA) thermal governor already implements that estimation method, in the thermal framework. However, this power estimation method can be applied to any platform where all the parameters are known (C, V and f), and not only those suffering thermal issues. As such, the code implementing this feature can be re-used to also populate the EM framework now used by EAS. As a first step, introduce in PM_OPP a helper function which CPUFreq drivers can use to register into the EM framework. This duplicates the power estimation done in IPA until it can be migrated to using the EM framework. This will be done later, once the EM framework has support for at least all platforms currently supported by IPA. Signed-off-by: Quentin Perret <quentin.perret@arm.com> Tested-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
376 lines
11 KiB
C
376 lines
11 KiB
C
/*
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* Generic OPP Interface
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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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 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_OPP_H__
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#define __LINUX_OPP_H__
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#include <linux/err.h>
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#include <linux/notifier.h>
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struct clk;
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struct regulator;
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struct dev_pm_opp;
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struct device;
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struct opp_table;
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enum dev_pm_opp_event {
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OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
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};
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/**
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* struct dev_pm_opp_supply - Power supply voltage/current values
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* @u_volt: Target voltage in microvolts corresponding to this OPP
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* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
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* @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
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* @u_amp: Maximum current drawn by the device in microamperes
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*
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* This structure stores the voltage/current values for a single power supply.
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*/
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struct dev_pm_opp_supply {
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unsigned long u_volt;
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unsigned long u_volt_min;
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unsigned long u_volt_max;
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unsigned long u_amp;
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};
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/**
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* struct dev_pm_opp_info - OPP freq/voltage/current values
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* @rate: Target clk rate in hz
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* @supplies: Array of voltage/current values for all power supplies
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*
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* This structure stores the freq/voltage/current values for a single OPP.
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*/
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struct dev_pm_opp_info {
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unsigned long rate;
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struct dev_pm_opp_supply *supplies;
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};
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/**
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* struct dev_pm_set_opp_data - Set OPP data
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* @old_opp: Old OPP info
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* @new_opp: New OPP info
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* @regulators: Array of regulator pointers
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* @regulator_count: Number of regulators
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* @clk: Pointer to clk
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* @dev: Pointer to the struct device
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*
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* This structure contains all information required for setting an OPP.
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*/
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struct dev_pm_set_opp_data {
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struct dev_pm_opp_info old_opp;
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struct dev_pm_opp_info new_opp;
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struct regulator **regulators;
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unsigned int regulator_count;
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struct clk *clk;
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struct device *dev;
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};
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#if defined(CONFIG_PM_OPP)
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struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
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struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, int index);
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void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
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unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
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unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
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bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
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int dev_pm_opp_get_opp_count(struct device *dev);
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unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
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unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
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unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev);
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unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
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struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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unsigned long freq,
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bool available);
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struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
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unsigned long *freq);
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struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
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unsigned long *freq);
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void dev_pm_opp_put(struct dev_pm_opp *opp);
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int dev_pm_opp_add(struct device *dev, unsigned long freq,
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unsigned long u_volt);
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void dev_pm_opp_remove(struct device *dev, unsigned long freq);
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int dev_pm_opp_enable(struct device *dev, unsigned long freq);
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int dev_pm_opp_disable(struct device *dev, unsigned long freq);
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int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
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int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
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struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
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void dev_pm_opp_put_supported_hw(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
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void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
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void dev_pm_opp_put_regulators(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char * name);
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void dev_pm_opp_put_clkname(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
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void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table);
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struct opp_table *dev_pm_opp_set_genpd_virt_dev(struct device *dev, struct device *virt_dev, int index);
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void dev_pm_opp_put_genpd_virt_dev(struct opp_table *opp_table, struct device *virt_dev);
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int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate);
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int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
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int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask);
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int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
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void dev_pm_opp_remove_table(struct device *dev);
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void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
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#else
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static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, int index)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_opp_table(struct opp_table *opp_table) {}
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static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
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{
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return 0;
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}
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static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
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{
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return false;
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}
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static inline int dev_pm_opp_get_opp_count(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
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{
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return 0;
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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unsigned long freq, bool available)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
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unsigned long *freq)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
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unsigned long *freq)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put(struct dev_pm_opp *opp) {}
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static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
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unsigned long u_volt)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq)
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{
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}
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static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
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{
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return 0;
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}
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static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
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{
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return 0;
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}
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static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb)
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{
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return -ENOTSUPP;
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}
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static inline struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
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const u32 *versions,
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unsigned int count)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
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int (*set_opp)(struct dev_pm_set_opp_data *data))
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_prop_name(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_regulators(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char * name)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_clkname(struct opp_table *opp_table) {}
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static inline struct opp_table *dev_pm_opp_set_genpd_virt_dev(struct device *dev, struct device *virt_dev, int index)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline void dev_pm_opp_put_genpd_virt_dev(struct opp_table *opp_table, struct device *virt_dev) {}
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static inline int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
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{
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return -EINVAL;
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}
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static inline void dev_pm_opp_remove_table(struct device *dev)
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{
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}
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static inline void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
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{
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}
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#endif /* CONFIG_PM_OPP */
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#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
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int dev_pm_opp_of_add_table(struct device *dev);
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int dev_pm_opp_of_add_table_indexed(struct device *dev, int index);
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void dev_pm_opp_of_remove_table(struct device *dev);
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int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask);
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void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
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int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
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struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
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struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
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int of_get_required_opp_performance_state(struct device_node *np, int index);
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void dev_pm_opp_of_register_em(struct cpumask *cpus);
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#else
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static inline int dev_pm_opp_of_add_table(struct device *dev)
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{
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return -ENOTSUPP;
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}
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static inline int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_of_remove_table(struct device *dev)
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{
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}
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static inline int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
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{
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return -ENOTSUPP;
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}
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static inline void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
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{
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}
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static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
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{
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return -ENOTSUPP;
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}
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static inline struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
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{
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return NULL;
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}
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static inline struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
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{
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return NULL;
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}
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static inline void dev_pm_opp_of_register_em(struct cpumask *cpus)
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{
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}
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static inline int of_get_required_opp_performance_state(struct device_node *np, int index)
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{
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return -ENOTSUPP;
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}
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#endif
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#endif /* __LINUX_OPP_H__ */
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