cpufreq: governor: Implement per policy instances of governors

Currently, there can't be multiple instances of single governor_type.
If we have a multi-package system, where we have multiple instances
of struct policy (per package), we can't have multiple instances of
same governor. i.e. We can't have multiple instances of ondemand
governor for multiple packages.

Governors directory in sysfs is created at /sys/devices/system/cpu/cpufreq/
governor-name/. Which again reflects that there can be only one
instance of a governor_type in the system.

This is a bottleneck for multicluster system, where we want different
packages to use same governor type, but with different tunables.

This patch uses the infrastructure provided by earlier patch and
implements init/exit routines for ondemand and conservative
governors.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 08df7a196116..85963fc48a5f 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -128,6 +128,11 @@ void disable_cpufreq(void)
 static LIST_HEAD(cpufreq_governor_list);
 static DEFINE_MUTEX(cpufreq_governor_mutex);
 
+bool have_governor_per_policy(void)
+{
+        return cpufreq_driver->have_governor_per_policy;
+}
+
 static struct cpufreq_policy *__cpufreq_cpu_get(unsigned int cpu, bool sysfs)
 {
         struct cpufreq_policy *data;
@@ -1546,10 +1551,12 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
                                                 policy->cpu, event);
         ret = policy->governor->governor(policy, event);
 
-        if (event == CPUFREQ_GOV_START)
-                policy->governor->initialized++;
-        else if (event == CPUFREQ_GOV_STOP)
-                policy->governor->initialized--;
+        if (!ret) {
+                if (event == CPUFREQ_GOV_POLICY_INIT)
+                        policy->governor->initialized++;
+                else if (event == CPUFREQ_GOV_POLICY_EXIT)
+                        policy->governor->initialized--;
+        }
 
         /* we keep one module reference alive for
                         each CPU governed by this CPU */