Messages in this thread Patch in this message | | | From | Lukasz Luba <> | Subject | [PATCH v2 02/17] PM: EM: Find first CPU online while updating OPP efficiency | Date | Fri, 12 May 2023 10:57:28 +0100 |
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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 online CPU from the Performance Domain.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> --- kernel/power/energy_model.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 0d037f3c4e58..85a70b7da023 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) || !pd) return; - policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd))); + /* Try to get a CPU which is online 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"); return; -- 2.25.1
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