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Subject[PATCH 01/10] cpufreq: Add policy create/remove notifiers
Date
This reverts commit f9f41e3ef99ac9d4e91b07634362e393fb929aad.

We have a new use case for policy create/remove notifiers (for
allocating/freeing QoS requests per policy), lets add them back.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/cpufreq/cpufreq.c | 15 ++++++++++++++-
include/linux/cpufreq.h | 2 ++
2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 4d6043ee7834..8a7eff2a3771 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1268,7 +1268,17 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy)
DEV_PM_QOS_MAX_FREQUENCY);
dev_pm_qos_remove_notifier(dev, &policy->nb_min,
DEV_PM_QOS_MIN_FREQUENCY);
- dev_pm_qos_remove_request(policy->max_freq_req);
+
+ if (policy->max_freq_req) {
+ /*
+ * CPUFREQ_CREATE_POLICY notification is sent only after
+ * successfully adding max_freq_req request.
+ */
+ blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+ CPUFREQ_REMOVE_POLICY, policy);
+ dev_pm_qos_remove_request(policy->max_freq_req);
+ }
+
dev_pm_qos_remove_request(policy->min_freq_req);
kfree(policy->min_freq_req);

@@ -1393,6 +1403,9 @@ static int cpufreq_online(unsigned int cpu)
ret);
goto out_destroy_policy;
}
+
+ blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+ CPUFREQ_CREATE_POLICY, policy);
}

if (cpufreq_driver->get && has_target()) {
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index d757a56a74dc..e28c8af697d2 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -458,6 +458,8 @@ static inline void cpufreq_resume(void) {}
/* Policy Notifiers */
#define CPUFREQ_ADJUST (0)
#define CPUFREQ_NOTIFY (1)
+#define CPUFREQ_CREATE_POLICY (2)
+#define CPUFREQ_REMOVE_POLICY (3)

#ifdef CONFIG_CPU_FREQ
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
--
2.21.0.rc0.269.g1a574e7a288b
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