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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>
This commit is contained in:
Pierre Gondois 2022-03-21 09:57:23 +00:00 committed by Rafael J. Wysocki
parent bdc21a4d28
commit fc3a9a9858
2 changed files with 7 additions and 0 deletions
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5
include/linux/energy_model.h
View File

@ -67,11 +67,16 @@ struct em_perf_domain {
* *
* EM_PERF_DOMAIN_SKIP_INEFFICIENCIES: Skip inefficient states when estimating * EM_PERF_DOMAIN_SKIP_INEFFICIENCIES: Skip inefficient states when estimating
* energy consumption. * 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_MILLIWATTS BIT(0)
#define EM_PERF_DOMAIN_SKIP_INEFFICIENCIES BIT(1) #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_span_cpus(em) (to_cpumask((em)->cpus))
#define em_is_artificial(em) ((em)->flags & EM_PERF_DOMAIN_ARTIFICIAL)
#ifdef CONFIG_ENERGY_MODEL #ifdef CONFIG_ENERGY_MODEL
#define EM_MAX_POWER 0xFFFF #define EM_MAX_POWER 0xFFFF

2
kernel/power/energy_model.c
View File

@ -384,6 +384,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
if (milliwatts) if (milliwatts)
dev->em_pd->flags |= EM_PERF_DOMAIN_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); em_cpufreq_update_efficiencies(dev);