cpufreq: report whether cpufreq supports Frequency Invariance (FI)
Now that the update of the FI scale factor is done in cpufreq core for selected functions - target(), target_index() and fast_switch(), we can provide feedback to the task scheduler and architecture code on whether cpufreq supports FI. For this purpose provide an external function to expose whether the cpufreq drivers support FI, by using a static key. The logic behind the enablement of cpufreq-based invariance is as follows: - cpufreq-based invariance is disabled by default - cpufreq-based invariance is enabled if any of the callbacks above is implemented while the unsupported setpolicy() is not The cpufreq_supports_freq_invariance() function only returns whether cpufreq is instrumented with the arch_set_freq_scale() calls that result in support for frequency invariance. Due to the lack of knowledge on whether the implementation of arch_set_freq_scale() actually results in the setting of a scale factor based on cpufreq information, it is up to the architecture code to ensure the setting and provision of the scale factor to the scheduler. Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -61,6 +61,12 @@ static struct cpufreq_driver *cpufreq_driver;
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static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
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static DEFINE_RWLOCK(cpufreq_driver_lock);
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static DEFINE_STATIC_KEY_FALSE(cpufreq_freq_invariance);
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bool cpufreq_supports_freq_invariance(void)
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{
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return static_branch_likely(&cpufreq_freq_invariance);
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}
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/* Flag to suspend/resume CPUFreq governors */
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static bool cpufreq_suspended;
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@ -2720,6 +2726,15 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
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cpufreq_driver = driver_data;
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write_unlock_irqrestore(&cpufreq_driver_lock, flags);
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/*
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* Mark support for the scheduler's frequency invariance engine for
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* drivers that implement target(), target_index() or fast_switch().
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*/
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if (!cpufreq_driver->setpolicy) {
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static_branch_enable_cpuslocked(&cpufreq_freq_invariance);
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pr_debug("supports frequency invariance");
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}
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if (driver_data->setpolicy)
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driver_data->flags |= CPUFREQ_CONST_LOOPS;
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@ -2789,6 +2804,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
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cpus_read_lock();
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subsys_interface_unregister(&cpufreq_interface);
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remove_boost_sysfs_file();
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static_branch_disable_cpuslocked(&cpufreq_freq_invariance);
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cpuhp_remove_state_nocalls_cpuslocked(hp_online);
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write_lock_irqsave(&cpufreq_driver_lock, flags);
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@ -217,6 +217,7 @@ void refresh_frequency_limits(struct cpufreq_policy *policy);
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void cpufreq_update_policy(unsigned int cpu);
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void cpufreq_update_limits(unsigned int cpu);
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bool have_governor_per_policy(void);
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bool cpufreq_supports_freq_invariance(void);
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struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
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void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
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void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
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@ -237,6 +238,10 @@ static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
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{
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return 0;
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}
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static inline bool cpufreq_supports_freq_invariance(void)
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{
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return false;
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}
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static inline void disable_cpufreq(void) { }
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#endif
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