1 // SPDX-License-Identifier: GPL-2.0-only
7  *            (C)  2002 - 2004 Dominik Brodowski <linux@brodo.de>
25  * cpufreq_set - set the CPU frequency
26  * @policy: pointer to policy struct where freq is being set
27  * @freq: target frequency in kHz
29  * Sets the CPU frequency to freq.
31 static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)  in cpufreq_set()  argument
33 	int ret = -EINVAL;  in cpufreq_set()
34 	struct userspace_policy *userspace = policy->governor_data;  in cpufreq_set()
36 	pr_debug("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);  in cpufreq_set()
38 	mutex_lock(&userspace->mutex);  in cpufreq_set()
39 	if (!userspace->is_managed)  in cpufreq_set()
42 	userspace->setspeed = freq;  in cpufreq_set()
44 	ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);  in cpufreq_set()
46 	mutex_unlock(&userspace->mutex);  in cpufreq_set()
52 	return sprintf(buf, "%u\n", policy->cur);  in show_speed()
61 		return -ENOMEM;  in cpufreq_userspace_policy_init()
63 	mutex_init(&userspace->mutex);  in cpufreq_userspace_policy_init()
65 	policy->governor_data = userspace;  in cpufreq_userspace_policy_init()
75 	kfree(policy->governor_data);  in cpufreq_userspace_policy_exit()
76 	policy->governor_data = NULL;  in cpufreq_userspace_policy_exit()
81 	struct userspace_policy *userspace = policy->governor_data;  in cpufreq_userspace_policy_start()
83 	BUG_ON(!policy->cur);  in cpufreq_userspace_policy_start()
84 	pr_debug("started managing cpu %u\n", policy->cpu);  in cpufreq_userspace_policy_start()
86 	mutex_lock(&userspace->mutex);  in cpufreq_userspace_policy_start()
87 	userspace->is_managed = 1;  in cpufreq_userspace_policy_start()
88 	userspace->setspeed = policy->cur;  in cpufreq_userspace_policy_start()
89 	mutex_unlock(&userspace->mutex);  in cpufreq_userspace_policy_start()
95 	struct userspace_policy *userspace = policy->governor_data;  in cpufreq_userspace_policy_stop()
97 	pr_debug("managing cpu %u stopped\n", policy->cpu);  in cpufreq_userspace_policy_stop()
99 	mutex_lock(&userspace->mutex);  in cpufreq_userspace_policy_stop()
100 	userspace->is_managed = 0;  in cpufreq_userspace_policy_stop()
101 	userspace->setspeed = 0;  in cpufreq_userspace_policy_stop()
102 	mutex_unlock(&userspace->mutex);  in cpufreq_userspace_policy_stop()
107 	struct userspace_policy *userspace = policy->governor_data;  in cpufreq_userspace_policy_limits()
109 	mutex_lock(&userspace->mutex);  in cpufreq_userspace_policy_limits()
111 	pr_debug("limit event for cpu %u: %u - %u kHz, currently %u kHz, last set to %u kHz\n",  in cpufreq_userspace_policy_limits()
112 		 policy->cpu, policy->min, policy->max, policy->cur, userspace->setspeed);  in cpufreq_userspace_policy_limits()
114 	if (policy->max < userspace->setspeed)  in cpufreq_userspace_policy_limits()
115 		__cpufreq_driver_target(policy, policy->max,  in cpufreq_userspace_policy_limits()
117 	else if (policy->min > userspace->setspeed)  in cpufreq_userspace_policy_limits()
118 		__cpufreq_driver_target(policy, policy->min,  in cpufreq_userspace_policy_limits()
121 		__cpufreq_driver_target(policy, userspace->setspeed,  in cpufreq_userspace_policy_limits()
124 	mutex_unlock(&userspace->mutex);  in cpufreq_userspace_policy_limits()