Commit 7928339c authored by Changwoo Min's avatar Changwoo Min Committed by Rafael J. Wysocki
Browse files

PM: EM: Add an iterator and accessor for the performance domain 



Add an iterator function (for_each_em_perf_domain) that iterates all the
performance domains in the global list. A passed callback function (cb) is
called for each performance domain.

Additionally, add a lookup function (em_perf_domain_get_by_id) that
searches for a performance domain by matching the ID in the global list.

Signed-off-by: default avatarChangwoo Min <changwoo@igalia.com>
Reviewed-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-6-changwoo@igalia.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e4ed8d26

kernel/power/em_netlink.h

+14 −0
Original line number Diff line number Diff line
@@ -10,7 +10,21 @@ 
#define _EM_NETLINK_H



#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_NET)

int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *),

			    void *data);

struct em_perf_domain *em_perf_domain_get_by_id(int id);

#else

static inline

int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *),

			    void *data)

{

	return -EINVAL;

}

static inline

struct em_perf_domain *em_perf_domain_get_by_id(int id)

{

	return NULL;

}

#endif



#endif /* _EM_NETLINK_H */

kernel/power/energy_model.c

+38 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#include <linux/sched/topology.h>

#include <linux/slab.h>



#include "em_netlink.h"



/*

 * Mutex serializing the registrations of performance domains and letting

 * callbacks defined by drivers sleep.
@@ -998,3 +1000,39 @@ void em_rebuild_sched_domains(void) 
	 */

	schedule_work(&rebuild_sd_work);

}



#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_NET)

int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *),

			    void *data)

{

	struct em_perf_domain *pd;



	lockdep_assert_not_held(&em_pd_mutex);

	guard(mutex)(&em_pd_list_mutex);



	list_for_each_entry(pd, &em_pd_list, node) {

		int ret;



		ret = cb(pd, data);

		if (ret)

			return ret;

	}



	return 0;

}



struct em_perf_domain *em_perf_domain_get_by_id(int id)

{

	struct em_perf_domain *pd;



	lockdep_assert_not_held(&em_pd_mutex);

	guard(mutex)(&em_pd_list_mutex);



	list_for_each_entry(pd, &em_pd_list, node) {

		if (pd->id == id)

			return pd;

	}



	return NULL;

}

#endif