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[v8,03/23] PM: EM: Find first CPU active while updating OPP efficiency

Message ID 20240208115557.1273962-4-lukasz.luba@arm.com
State Accepted
Commit 99907d6054f2d39a625004f9f4e3fe9297838a3c
Headers show
Series Introduce runtime modifiable Energy Model | expand

Commit Message

Lukasz Luba Feb. 8, 2024, 11:55 a.m. UTC 
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>
---
 kernel/power/energy_model.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
diff mbox series

Patch

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;