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

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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: Changwoo Min <changwoo@igalia.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-6-changwoo@igalia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Changwoo Min
2025-10-21 07:09:09 +09:00
committed by Rafael J. Wysocki
parent e4ed8d26c5
commit 7928339cfe
2 changed files with 52 additions and 0 deletions
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14
kernel/power/em_netlink.h
View File

@@ -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 */

38
kernel/power/energy_model.c
View File

@@ -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