forked from luck/tmp_suning_uos_patched
cpufreq: Process remote callbacks from any CPU if the platform permits
On many platforms, CPUs can do DVFS across cpufreq policies. i.e CPU from policy-A can change frequency of CPUs belonging to policy-B. This is quite common in case of ARM platforms where we don't configure any per-cpu register. Add a flag to identify such platforms and update cpufreq_can_do_remote_dvfs() to allow remote callbacks if this flag is set. Also enable the flag for cpufreq-dt driver which is used only on ARM platforms currently. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Saravana Kannan <skannan@codeaurora.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -274,6 +274,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
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transition_latency = CPUFREQ_ETERNAL;
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transition_latency = CPUFREQ_ETERNAL;
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policy->cpuinfo.transition_latency = transition_latency;
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policy->cpuinfo.transition_latency = transition_latency;
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policy->dvfs_possible_from_any_cpu = true;
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return 0;
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return 0;
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@ -127,6 +127,15 @@ struct cpufreq_policy {
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*/
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*/
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unsigned int transition_delay_us;
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unsigned int transition_delay_us;
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/*
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* Remote DVFS flag (Not added to the driver structure as we don't want
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* to access another structure from scheduler hotpath).
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*
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* Should be set if CPUs can do DVFS on behalf of other CPUs from
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* different cpufreq policies.
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*/
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bool dvfs_possible_from_any_cpu;
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/* Cached frequency lookup from cpufreq_driver_resolve_freq. */
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/* Cached frequency lookup from cpufreq_driver_resolve_freq. */
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unsigned int cached_target_freq;
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unsigned int cached_target_freq;
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int cached_resolved_idx;
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int cached_resolved_idx;
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@ -564,8 +573,13 @@ struct governor_attr {
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static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy)
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static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy)
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{
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{
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/* Allow remote callbacks only on the CPUs sharing cpufreq policy */
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/*
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if (cpumask_test_cpu(smp_processor_id(), policy->cpus))
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* Allow remote callbacks if:
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* - dvfs_possible_from_any_cpu flag is set
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* - the local and remote CPUs share cpufreq policy
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*/
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if (policy->dvfs_possible_from_any_cpu ||
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cpumask_test_cpu(smp_processor_id(), policy->cpus))
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return true;
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return true;
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return false;
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return false;
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