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PM: EM: Add em_perf_state_from_pd() to get performance states table

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Introduce a wrapper to get the performance states table of the performance
domain. The function should be called within the RCU read critical
section.

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.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 2024-02-08 11:55:46 +00:00 committed by Rafael J. Wysocki
parent 977230d5d5
commit ee1a19873c
1 changed files with 22 additions and 0 deletions
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22
include/linux/energy_model.h
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@ -338,6 +338,23 @@ static inline int em_pd_nr_perf_states(struct em_perf_domain *pd)
return pd->nr_perf_states;
}
/**
* em_perf_state_from_pd() - Get the performance states table of perf.
* domain
* @pd : performance domain for which this must be done
*
* To use this function the rcu_read_lock() should be hold. After the usage
* of the performance states table is finished, the rcu_read_unlock() should
* be called.
*
* Return: the pointer to performance states table of the performance domain
*/
static inline
struct em_perf_state *em_perf_state_from_pd(struct em_perf_domain *pd)
{
return rcu_dereference(pd->em_table)->state;
}
#else
struct em_data_callback {};
#define EM_ADV_DATA_CB(_active_power_cb, _cost_cb) { }
@ -384,6 +401,11 @@ int em_dev_update_perf_domain(struct device *dev,
{
return -EINVAL;
}
static inline
struct em_perf_state *em_perf_state_from_pd(struct em_perf_domain *pd)
{
return NULL;
}
#endif
#endif