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| author | Lukasz Luba <lukasz.luba@arm.com> | 2024-02-08 11:55:37 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-02-08 15:00:23 +0100 |
| commit | 99907d6054f2d39a625004f9f4e3fe9297838a3c (patch) | |
| tree | 38009504155cd13786fe120b11b2f5d666d9bf8f /kernel/power | |
| parent | e7b1cc9a7ea6d7862baac0fd7b145573618727dd (diff) | |
| download | linux-99907d6054f2d39a625004f9f4e3fe9297838a3c.tar.gz linux-99907d6054f2d39a625004f9f4e3fe9297838a3c.tar.bz2 linux-99907d6054f2d39a625004f9f4e3fe9297838a3c.zip | |
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>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/energy_model.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 8c373b151875..0c3220ff54f7 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -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; |