Frequency-invariant accounting support based on the ratio of current frequency and maximum supported frequency is an optional feature an arch can implement.
Since there are cpufreq drivers (e.g. cpufreq-dt) which can be build for different arch's a default implementation of the frequency-invariance setter function arch_set_freq_scale() is needed. This default implementation is an empty weak function which will be overwritten by a strong function in case the arch provides one. The setter function passes the cpumask of related (to the frequency change) cpus (online and offline cpus), the (new) current frequency and the maximum supported frequency. Cc: Rafael J. Wysocki <[email protected]> Cc: Viresh Kumar <[email protected]> Signed-off-by: Dietmar Eggemann <[email protected]> Acked-by: Rafael J. Wysocki <[email protected]> Acked-by: Viresh Kumar <[email protected]> --- drivers/cpufreq/cpufreq.c | 6 ++++++ include/linux/cpufreq.h | 3 +++ 2 files changed, 9 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index ea43b147a7fe..41d148af7748 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -161,6 +161,12 @@ u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) } EXPORT_SYMBOL_GPL(get_cpu_idle_time); +__weak void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq, + unsigned long max_freq) +{ +} +EXPORT_SYMBOL_GPL(arch_set_freq_scale); + /* * This is a generic cpufreq init() routine which can be used by cpufreq * drivers of SMP systems. It will do following: diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 537ff842ff73..28734ee185a7 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -919,6 +919,9 @@ static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) extern unsigned int arch_freq_get_on_cpu(int cpu); +extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq, + unsigned long max_freq); + /* the following are really really optional */ extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; -- 2.11.0
