Messages in this thread | ![/](/images/icornerl.gif) | | From | "Rafael J. Wysocki" <> | Date | Tue, 26 Sep 2023 20:32:33 +0200 | Subject | Re: [PATCH v4 03/18] PM: EM: Find first CPU online while updating OPP efficiency |
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On Mon, Sep 25, 2023 at 10:11 AM Lukasz Luba <lukasz.luba@arm.com> wrote: > > 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 42486674b834..3dafdd7731c4 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);
The comment talks about "online" and cpu_active_mask is used. Isn't it a bit inconsistent?
> + 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; > -- > 2.25.1 >
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