Commit ee1a1987 authored by Lukasz Luba's avatar Lukasz Luba Committed by Rafael J. Wysocki
Browse files

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



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: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 977230d5

include/linux/energy_model.h

+22 −0
Original line number Diff line number Diff line
@@ -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