diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/cpufreq/cpufreq_userspace.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/cpufreq/cpufreq_userspace.c | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/ANDROID_3.4.5/drivers/cpufreq/cpufreq_userspace.c b/ANDROID_3.4.5/drivers/cpufreq/cpufreq_userspace.c deleted file mode 100644 index bedac1aa..00000000 --- a/ANDROID_3.4.5/drivers/cpufreq/cpufreq_userspace.c +++ /dev/null @@ -1,222 +0,0 @@ - -/* - * linux/drivers/cpufreq/cpufreq_userspace.c - * - * Copyright (C) 2001 Russell King - * (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/smp.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/interrupt.h> -#include <linux/cpufreq.h> -#include <linux/cpu.h> -#include <linux/types.h> -#include <linux/fs.h> -#include <linux/sysfs.h> -#include <linux/mutex.h> - -/** - * A few values needed by the userspace governor - */ -static DEFINE_PER_CPU(unsigned int, cpu_max_freq); -static DEFINE_PER_CPU(unsigned int, cpu_min_freq); -static DEFINE_PER_CPU(unsigned int, cpu_cur_freq); /* current CPU freq */ -static DEFINE_PER_CPU(unsigned int, cpu_set_freq); /* CPU freq desired by - userspace */ -static DEFINE_PER_CPU(unsigned int, cpu_is_managed); - -static DEFINE_MUTEX(userspace_mutex); -static int cpus_using_userspace_governor; - -/* keep track of frequency transitions */ -static int -userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val, - void *data) -{ - struct cpufreq_freqs *freq = data; - - if (!per_cpu(cpu_is_managed, freq->cpu)) - return 0; - - if (val == CPUFREQ_POSTCHANGE) { - pr_debug("saving cpu_cur_freq of cpu %u to be %u kHz\n", - freq->cpu, freq->new); - per_cpu(cpu_cur_freq, freq->cpu) = freq->new; - } - - return 0; -} - -static struct notifier_block userspace_cpufreq_notifier_block = { - .notifier_call = userspace_cpufreq_notifier -}; - - -/** - * cpufreq_set - set the CPU frequency - * @policy: pointer to policy struct where freq is being set - * @freq: target frequency in kHz - * - * Sets the CPU frequency to freq. - */ -static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq) -{ - int ret = -EINVAL; - - pr_debug("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq); - - mutex_lock(&userspace_mutex); - if (!per_cpu(cpu_is_managed, policy->cpu)) - goto err; - - per_cpu(cpu_set_freq, policy->cpu) = freq; - - if (freq < per_cpu(cpu_min_freq, policy->cpu)) - freq = per_cpu(cpu_min_freq, policy->cpu); - if (freq > per_cpu(cpu_max_freq, policy->cpu)) - freq = per_cpu(cpu_max_freq, policy->cpu); - - /* - * We're safe from concurrent calls to ->target() here - * as we hold the userspace_mutex lock. If we were calling - * cpufreq_driver_target, a deadlock situation might occur: - * A: cpufreq_set (lock userspace_mutex) -> - * cpufreq_driver_target(lock policy->lock) - * B: cpufreq_set_policy(lock policy->lock) -> - * __cpufreq_governor -> - * cpufreq_governor_userspace (lock userspace_mutex) - */ - ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L); - - err: - mutex_unlock(&userspace_mutex); - return ret; -} - - -static ssize_t show_speed(struct cpufreq_policy *policy, char *buf) -{ - return sprintf(buf, "%u\n", per_cpu(cpu_cur_freq, policy->cpu)); -} - -static int cpufreq_governor_userspace(struct cpufreq_policy *policy, - unsigned int event) -{ - unsigned int cpu = policy->cpu; - int rc = 0; - - switch (event) { - case CPUFREQ_GOV_START: - if (!cpu_online(cpu)) - return -EINVAL; - BUG_ON(!policy->cur); - mutex_lock(&userspace_mutex); - - if (cpus_using_userspace_governor == 0) { - cpufreq_register_notifier( - &userspace_cpufreq_notifier_block, - CPUFREQ_TRANSITION_NOTIFIER); - } - cpus_using_userspace_governor++; - - per_cpu(cpu_is_managed, cpu) = 1; - per_cpu(cpu_min_freq, cpu) = policy->min; - per_cpu(cpu_max_freq, cpu) = policy->max; - per_cpu(cpu_cur_freq, cpu) = policy->cur; - per_cpu(cpu_set_freq, cpu) = policy->cur; - pr_debug("managing cpu %u started " - "(%u - %u kHz, currently %u kHz)\n", - cpu, - per_cpu(cpu_min_freq, cpu), - per_cpu(cpu_max_freq, cpu), - per_cpu(cpu_cur_freq, cpu)); - - mutex_unlock(&userspace_mutex); - break; - case CPUFREQ_GOV_STOP: - mutex_lock(&userspace_mutex); - cpus_using_userspace_governor--; - if (cpus_using_userspace_governor == 0) { - cpufreq_unregister_notifier( - &userspace_cpufreq_notifier_block, - CPUFREQ_TRANSITION_NOTIFIER); - } - - per_cpu(cpu_is_managed, cpu) = 0; - per_cpu(cpu_min_freq, cpu) = 0; - per_cpu(cpu_max_freq, cpu) = 0; - per_cpu(cpu_set_freq, cpu) = 0; - pr_debug("managing cpu %u stopped\n", cpu); - mutex_unlock(&userspace_mutex); - break; - case CPUFREQ_GOV_LIMITS: - mutex_lock(&userspace_mutex); - pr_debug("limit event for cpu %u: %u - %u kHz, " - "currently %u kHz, last set to %u kHz\n", - cpu, policy->min, policy->max, - per_cpu(cpu_cur_freq, cpu), - per_cpu(cpu_set_freq, cpu)); - if (policy->max < per_cpu(cpu_set_freq, cpu)) { - __cpufreq_driver_target(policy, policy->max, - CPUFREQ_RELATION_H); - } else if (policy->min > per_cpu(cpu_set_freq, cpu)) { - __cpufreq_driver_target(policy, policy->min, - CPUFREQ_RELATION_L); - } else { - __cpufreq_driver_target(policy, - per_cpu(cpu_set_freq, cpu), - CPUFREQ_RELATION_L); - } - per_cpu(cpu_min_freq, cpu) = policy->min; - per_cpu(cpu_max_freq, cpu) = policy->max; - per_cpu(cpu_cur_freq, cpu) = policy->cur; - mutex_unlock(&userspace_mutex); - break; - } - return rc; -} - - -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE -static -#endif -struct cpufreq_governor cpufreq_gov_userspace = { - .name = "userspace", - .governor = cpufreq_governor_userspace, - .store_setspeed = cpufreq_set, - .show_setspeed = show_speed, - .owner = THIS_MODULE, -}; - -static int __init cpufreq_gov_userspace_init(void) -{ - return cpufreq_register_governor(&cpufreq_gov_userspace); -} - - -static void __exit cpufreq_gov_userspace_exit(void) -{ - cpufreq_unregister_governor(&cpufreq_gov_userspace); -} - - -MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, " - "Russell King <rmk@arm.linux.org.uk>"); -MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'"); -MODULE_LICENSE("GPL"); - -#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE -fs_initcall(cpufreq_gov_userspace_init); -#else -module_init(cpufreq_gov_userspace_init); -#endif -module_exit(cpufreq_gov_userspace_exit); |