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PM: EM: Add a flag indicating units of power values in Energy Model

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There are different platforms and devices which might use different scale
for the power values. Kernel sub-systems might need to check if all
Energy Model (EM) devices are using the same scale. Address that issue and
store the information inside EM for each device. Thanks to that they can
be easily compared and proper action triggered.

Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Quentin Perret <qperret@google.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2020-11-05 12:50:01 +00:00 • committed by Rafael J. Wysocki
parent f8394f232b
commit c250d50fe2
4 changed files with 33 additions and 5 deletions
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9
include/linux/energy_model.h
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@ -29,6 +29,8 @@ struct em_perf_state {
* em_perf_domain - Performance domain
* @table: List of performance states, in ascending order
* @nr_perf_states: Number of performance states
* @milliwatts: Flag indicating the power values are in milli-Watts
* or some other scale.
* @cpus: Cpumask covering the CPUs of the domain. It's here
* for performance reasons to avoid potential cache
* misses during energy calculations in the scheduler
@ -43,6 +45,7 @@ struct em_perf_state {
struct em_perf_domain {
struct em_perf_state *table;
int nr_perf_states;
int milliwatts;
unsigned long cpus[];
};
@ -79,7 +82,8 @@ struct em_data_callback {
struct em_perf_domain *em_cpu_get(int cpu);
struct em_perf_domain *em_pd_get(struct device *dev);
int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
struct em_data_callback *cb, cpumask_t *span);
struct em_data_callback *cb, cpumask_t *span,
bool milliwatts);
void em_dev_unregister_perf_domain(struct device *dev);
/**
@ -186,7 +190,8 @@ struct em_data_callback {};
static inline
int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
struct em_data_callback *cb, cpumask_t *span)
struct em_data_callback *cb, cpumask_t *span,
bool milliwatts)
{
return -EINVAL;
}