77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Abstract code for CPUFreq governor tunable sysfs attributes.
|
|
*
|
|
* Copyright (C) 2016, Intel Corporation
|
|
* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
|
*/
|
|
|
|
#include "cpufreq_governor.h"
|
|
|
|
static inline struct governor_attr *to_gov_attr(struct attribute *attr)
|
|
{
|
|
return container_of(attr, struct governor_attr, attr);
|
|
}
|
|
|
|
static ssize_t governor_show(struct kobject *kobj, struct attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct governor_attr *gattr = to_gov_attr(attr);
|
|
|
|
return gattr->show(to_gov_attr_set(kobj), buf);
|
|
}
|
|
|
|
static ssize_t governor_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct gov_attr_set *attr_set = to_gov_attr_set(kobj);
|
|
struct governor_attr *gattr = to_gov_attr(attr);
|
|
int ret;
|
|
|
|
mutex_lock(&attr_set->update_lock);
|
|
ret = attr_set->usage_count ? gattr->store(attr_set, buf, count) : -EBUSY;
|
|
mutex_unlock(&attr_set->update_lock);
|
|
return ret;
|
|
}
|
|
|
|
const struct sysfs_ops governor_sysfs_ops = {
|
|
.show = governor_show,
|
|
.store = governor_store,
|
|
};
|
|
EXPORT_SYMBOL_GPL(governor_sysfs_ops);
|
|
|
|
void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node)
|
|
{
|
|
INIT_LIST_HEAD(&attr_set->policy_list);
|
|
mutex_init(&attr_set->update_lock);
|
|
attr_set->usage_count = 1;
|
|
list_add(list_node, &attr_set->policy_list);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gov_attr_set_init);
|
|
|
|
void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node)
|
|
{
|
|
mutex_lock(&attr_set->update_lock);
|
|
attr_set->usage_count++;
|
|
list_add(list_node, &attr_set->policy_list);
|
|
mutex_unlock(&attr_set->update_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gov_attr_set_get);
|
|
|
|
unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node)
|
|
{
|
|
unsigned int count;
|
|
|
|
mutex_lock(&attr_set->update_lock);
|
|
list_del(list_node);
|
|
count = --attr_set->usage_count;
|
|
mutex_unlock(&attr_set->update_lock);
|
|
if (count)
|
|
return count;
|
|
|
|
mutex_destroy(&attr_set->update_lock);
|
|
kobject_put(&attr_set->kobj);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gov_attr_set_put);
|