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authorLukasz Luba <lukasz.luba@arm.com>2024-02-08 11:55:37 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2024-02-08 15:00:23 +0100
commit99907d6054f2d39a625004f9f4e3fe9297838a3c (patch)
tree38009504155cd13786fe120b11b2f5d666d9bf8f /kernel/power
parente7b1cc9a7ea6d7862baac0fd7b145573618727dd (diff)
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.c11
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;