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authorDietmar Eggemann <dietmar.eggemann@arm.com>2017-09-26 17:41:07 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-03 02:37:53 +0200
commite7d5459dfaf613799915e901189d296bdc7534f9 (patch)
tree9d428eea59ddbe05521c342f10c5ea5ad0688b41
parent5408211a8f290ace85147858f4e05e18b942f489 (diff)
downloadlinux-e7d5459dfaf613799915e901189d296bdc7534f9.tar.gz
cpufreq: provide default frequency-invariance setter function
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. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/cpufreq/cpufreq.c6
-rw-r--r--include/linux/cpufreq.h3
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index ea43b14..41d148a 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 537ff842..28734ee 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;