diff options
| author | Pierre Gondois <Pierre.Gondois@arm.com> | 2022-03-21 09:57:23 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-04-13 16:26:17 +0200 |
| commit | fc3a9a9858478ab5f8441765a3f9552a0ceba10c (patch) | |
| tree | 4a85b97562b6d43775f86b7d2892e403d091ce83 | |
| parent | bdc21a4d286c6917fe966fd765de99411095b1b4 (diff) | |
PM: EM: Add artificial EM flag
The Energy Model (EM) can be used on platforms which are missing real
power information. Those platforms would implement .get_cost() which
populates needed values for the Energy Aware Scheduler (EAS). The EAS
doesn't use 'power' fields from EM, but other frameworks might use them.
Thus, to avoid miss-usage of this specific type of EM, introduce a new
flags which can be checked by other frameworks.
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | include/linux/energy_model.h | 5 | ||||
| -rw-r--r-- | kernel/power/energy_model.c | 2 |
2 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 0a3a5663177b..92e82a322859 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -67,11 +67,16 @@ struct em_perf_domain { * * EM_PERF_DOMAIN_SKIP_INEFFICIENCIES: Skip inefficient states when estimating * energy consumption. + * + * EM_PERF_DOMAIN_ARTIFICIAL: The power values are artificial and might be + * created by platform missing real power information */ #define EM_PERF_DOMAIN_MILLIWATTS BIT(0) #define EM_PERF_DOMAIN_SKIP_INEFFICIENCIES BIT(1) +#define EM_PERF_DOMAIN_ARTIFICIAL BIT(2) #define em_span_cpus(em) (to_cpumask((em)->cpus)) +#define em_is_artificial(em) ((em)->flags & EM_PERF_DOMAIN_ARTIFICIAL) #ifdef CONFIG_ENERGY_MODEL #define EM_MAX_POWER 0xFFFF diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 0153b0ca7b23..6ecee99af842 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -384,6 +384,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states, if (milliwatts) dev->em_pd->flags |= EM_PERF_DOMAIN_MILLIWATTS; + else if (cb->get_cost) + dev->em_pd->flags |= EM_PERF_DOMAIN_ARTIFICIAL; em_cpufreq_update_efficiencies(dev); |