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PM: EM: Find first CPU active while updating OPP efficiency 

The Energy Model might be updated at runtime and the energy efficiency
for each OPP may change. Thus, there is a need to update also the
cpufreq framework and make it aligned to the new values. In order to
do that, use a first active CPU from the Performance Domain. This is
needed since the first CPU in the cpumask might be offline when we
run this code path.

Reviewed-by: Hongyan Xia <hongyan.xia2@arm.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2024-02-08 11:55:37 +00:00 committed by Rafael J. Wysocki
parent e7b1cc9a7e
commit 99907d6054
1 changed files with 9 additions and 2 deletions
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11
kernel/power/energy_model.c
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@ -243,12 +243,19 @@ em_cpufreq_update_efficiencies(struct device *dev, struct em_perf_state *table)
struct em_perf_domain *pd = dev->em_pd;
struct cpufreq_policy *policy;
int found = 0;
int i;
int i, cpu;
if (!_is_cpu_device(dev))
return;
policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd)));
/* Try to get a CPU which is active and in this PD */
cpu = cpumask_first_and(em_span_cpus(pd), cpu_active_mask);
if (cpu >= nr_cpu_ids) {
dev_warn(dev, "EM: No online CPU for CPUFreq policy\n");
return;
}
policy = cpufreq_cpu_get(cpu);
if (!policy) {
dev_warn(dev, "EM: Access to CPUFreq policy failed\n");
return;