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