ANDROID: 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.

Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Change-Id: I912d5815ee29e1171c498e638d1a089c5a598add
Signed-off-by: Chris Redpath <chris.redpath@arm.com>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index ea43b147a7fe93adc3c8229327532debec429486..e38cab3fbe4cec98c314f5e4ef267f24f1c08ec7 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2430,6 +2430,17 @@ int cpufreq_boost_enabled(void)
 }
 EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
 
+/*********************************************************************
+ *               FREQUENCY INVARIANT ACCOUNTING SUPPORT              *
+ *********************************************************************/
+
+__weak void arch_set_freq_scale(struct cpumask *cpus,
+                               unsigned long cur_freq,
+                               unsigned long max_freq)
+{
+}
+EXPORT_SYMBOL_GPL(arch_set_freq_scale);
+
 /*********************************************************************
  *               REGISTER / UNREGISTER CPUFREQ DRIVER                *
  *********************************************************************/

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 537ff842ff733290252c795b2a8261b82944fd94..28734ee185a7d4baf3517550a44560621be08a51 100644 (file)
--- 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;