diff options
| author | Viresh Kumar <viresh.kumar@linaro.org> | 2017-07-28 09:46:39 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-01 15:24:54 +0300 |
| commit | 99d14d0e16fadb4de001bacc0ac0786a9ebecf2a (patch) | |
| tree | f09808829ea602773845903f05ca6699b5fb16c6 /include/linux/cpufreq.h | |
| parent | 674e75411fc260b0d4532701228cfe12fc090da8 (diff) | |
| download | linux-99d14d0e16fadb4de001bacc0ac0786a9ebecf2a.tar.xz | |
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>
Diffstat (limited to 'include/linux/cpufreq.h')
| -rw-r--r-- | include/linux/cpufreq.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index c4035964e6b3..1981a4a167ce 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; @@ -564,8 +573,13 @@ struct governor_attr { static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy) { - /* Allow remote callbacks only on the CPUs sharing cpufreq policy */ - if (cpumask_test_cpu(smp_processor_id(), policy->cpus)) + /* + * Allow remote callbacks if: + * - dvfs_possible_from_any_cpu flag is set + * - the local and remote CPUs share cpufreq policy + */ + if (policy->dvfs_possible_from_any_cpu || + cpumask_test_cpu(smp_processor_id(), policy->cpus)) return true; return false; |