Merge branch 'pm-cpufreq-sched'

* pm-cpufreq-sched:
  cpufreq: schedutil: Always process remote callback with slow switching
  cpufreq: schedutil: Don't restrict kthread to related_cpus unnecessarily
  cpufreq: Return 0 from ->fast_switch() on errors
  cpufreq: Simplify cpufreq_can_do_remote_dvfs()
  cpufreq: Process remote callbacks from any CPU if the platform permits
  sched: cpufreq: Allow remote cpufreq callbacks
  cpufreq: schedutil: Use unsigned int for iowait boost
  cpufreq: schedutil: Make iowait boost more energy efficient

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 5f40522ec98c..537ff842ff73 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -127,6 +127,15 @@ struct cpufreq_policy {
          */
         unsigned int            transition_delay_us;
 
+        /*
+         * Remote DVFS flag (Not added to the driver structure as we don't want
+         * to access another structure from scheduler hotpath).
+         *
+         * Should be set if CPUs can do DVFS on behalf of other CPUs from
+         * different cpufreq policies.
+         */
+        bool                    dvfs_possible_from_any_cpu;
+
          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
         unsigned int cached_target_freq;
         int cached_resolved_idx;
@@ -562,6 +571,17 @@ struct governor_attr {
                          size_t count);
 };
 
+static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy)
+{
+        /*
+         * Allow remote callbacks if:
+         * - dvfs_possible_from_any_cpu flag is set
+         * - the local and remote CPUs share cpufreq policy
+         */
+        return policy->dvfs_possible_from_any_cpu ||
+                cpumask_test_cpu(smp_processor_id(), policy->cpus);
+}
+
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