[RFC PATCH 3/4] cpufreq: Add Active Stats calls tracking frequency changes

[Lukasz Luba <lukasz.luba@arm.com>]

The Active Stats framework tracks and accounts the activity of the CPU
for each performance level. It accounts the real residency, when the CPU
was not idle, at a given performance level. This patch adds needed calls
which provide the CPU frequency transition events to the Active Stats
framework.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
 drivers/cpufreq/cpufreq.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 802abc925b2a..d79cb9310572 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -14,6 +14,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/active_stats.h>
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/cpu_cooling.h>
@@ -387,6 +388,8 @@ static void cpufreq_notify_transition(struct cpufreq_policy *policy,
 
 		cpufreq_stats_record_transition(policy, freqs->new);
 		policy->cur = freqs->new;
+
+		active_stats_cpu_freq_change(policy->cpu, freqs->new);
 	}
 }
 
@@ -2085,6 +2088,8 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 			    policy->cpuinfo.max_freq);
 	cpufreq_stats_record_transition(policy, freq);
 
+	active_stats_cpu_freq_fast_change(policy->cpu, freq);
+
 	if (trace_cpu_frequency_enabled()) {
 		for_each_cpu(cpu, policy->cpus)
 			trace_cpu_frequency(freq, cpu);
-- 
2.17.1