Release 4.7 drivers/cpufreq/cpufreq.c

/*
 *  linux/drivers/cpufreq/cpufreq.c
 *
 *  Copyright (C) 2001 Russell King
 *            (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
 *            (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>
 *
 *  Oct 2005 - Ashok Raj <ashok.raj@intel.com>
 *      Added handling for CPU hotplug
 *  Feb 2006 - Jacob Shin <jacob.shin@amd.com>
 *      Fix handling for CPU hotplug -- affected CPUs
 *
 * 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.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/tick.h>
#include <trace/events/power.h>

static LIST_HEAD(cpufreq_policy_list);



static inline bool policy_is_inactive(struct cpufreq_policy *policy)
{
	return cpumask_empty(policy->cpus);
}

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/* Macros to iterate over CPU policies */

#define for_each_suitable_policy(__policy, __active)			 \
	list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \
                if ((__active) == !policy_is_inactive(__policy))


#define for_each_active_policy(__policy)		\
	for_each_suitable_policy(__policy, true)

#define for_each_inactive_policy(__policy)		\
	for_each_suitable_policy(__policy, false)


#define for_each_policy(__policy)			\
	list_for_each_entry(__policy, &cpufreq_policy_list, policy_list)

/* Iterate over governors */
static LIST_HEAD(cpufreq_governor_list);

#define for_each_governor(__governor)				\
	list_for_each_entry(__governor, &cpufreq_governor_list, governor_list)

/**
 * The "cpufreq driver" - the arch- or hardware-dependent low
 * level driver of CPUFreq support, and its spinlock. This lock
 * also protects the cpufreq_cpu_data array.
 */

static struct cpufreq_driver *cpufreq_driver;
static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
static DEFINE_RWLOCK(cpufreq_driver_lock);

/* Flag to suspend/resume CPUFreq governors */

static bool cpufreq_suspended;



static inline bool has_target(void)
{
	return cpufreq_driver->target_index || cpufreq_driver->target;
}

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/* internal prototypes */
static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
static int cpufreq_start_governor(struct cpufreq_policy *policy);



static inline void cpufreq_exit_governor(struct cpufreq_policy *policy)
{
	(void)cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
}

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static inline void cpufreq_stop_governor(struct cpufreq_policy *policy)
{
	(void)cpufreq_governor(policy, CPUFREQ_GOV_STOP);
}

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/**
 * Two notifier lists: the "policy" list is involved in the
 * validation process for a new CPU frequency policy; the
 * "transition" list for kernel code that needs to handle
 * changes to devices when the CPU clock speed changes.
 * The mutex locks both lists.
 */
static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);

static struct srcu_notifier_head cpufreq_transition_notifier_list;


static bool init_cpufreq_transition_notifier_list_called;


static int __init init_cpufreq_transition_notifier_list(void)
{
	srcu_init_notifier_head(&cpufreq_transition_notifier_list);
	init_cpufreq_transition_notifier_list_called = true;
	return 0;
}
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pure_initcall(init_cpufreq_transition_notifier_list);


static int off __read_mostly;


static int cpufreq_disabled(void)
{
	return off;
}
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void disable_cpufreq(void)
{
	off = 1;
}
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static DEFINE_MUTEX(cpufreq_governor_mutex);



bool have_governor_per_policy(void)
{
	return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY);
}
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EXPORT_SYMBOL_GPL(have_governor_per_policy);



struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
{
	if (have_governor_per_policy())
		return &policy->kobj;
	else
		return cpufreq_global_kobject;
}
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EXPORT_SYMBOL_GPL(get_governor_parent_kobj);



struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
{
	struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);

	return policy && !policy_is_inactive(policy) ?
		policy->freq_table : NULL;
}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);



static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
{
	u64 idle_time;
	u64 cur_wall_time;
	u64 busy_time;

	cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());

	busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];

	idle_time = cur_wall_time - busy_time;
	if (wall)
		*wall = cputime_to_usecs(cur_wall_time);

	return cputime_to_usecs(idle_time);
}

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u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
{
	u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL);

	if (idle_time == -1ULL)
		return get_cpu_idle_time_jiffy(cpu, wall);
	else if (!io_busy)
		idle_time += get_cpu_iowait_time_us(cpu, wall);

	return idle_time;
}
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EXPORT_SYMBOL_GPL(get_cpu_idle_time);

/*
 * This is a generic cpufreq init() routine which can be used by cpufreq
 * drivers of SMP systems. It will do following:
 * - validate & show freq table passed
 * - set policies transition latency
 * - policy->cpus with all possible CPUs
 */


int cpufreq_generic_init(struct cpufreq_policy *policy,
		struct cpufreq_frequency_table *table,
		unsigned int transition_latency)
{
	int ret;

	ret = cpufreq_table_validate_and_show(policy, table);
	if (ret) {
		pr_err("%s: invalid frequency table: %d\n", __func__, ret);
		return ret;
	}

	policy->cpuinfo.transition_latency = transition_latency;

	/*
         * The driver only supports the SMP configuration where all processors
         * share the clock and voltage and clock.
         */
	cpumask_setall(policy->cpus);

	return 0;
}
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EXPORT_SYMBOL_GPL(cpufreq_generic_init);



struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
{
	struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);

	return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL;
}
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EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw);



unsigned int cpufreq_generic_get(unsigned int cpu)
{
	struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);

	if (!policy || IS_ERR(policy->clk)) {
		pr_err("%s: No %s associated to cpu: %d\n",
		       __func__, policy ? "clk" : "policy", cpu);
		return 0;
	}

	return clk_get_rate(policy->clk) / 1000;
}
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EXPORT_SYMBOL_GPL(cpufreq_generic_get);

/**
 * cpufreq_cpu_get: returns policy for a cpu and marks it busy.
 *
 * @cpu: cpu to find policy for.
 *
 * This returns policy for 'cpu', returns NULL if it doesn't exist.
 * It also increments the kobject reference count to mark it busy and so would
 * require a corresponding call to cpufreq_cpu_put() to decrement it back.
 * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be
 * freed as that depends on the kobj count.
 *
 * Return: A valid policy on success, otherwise NULL on failure.
 */


struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
{
	struct cpufreq_policy *policy = NULL;
	unsigned long flags;

	if (WARN_ON(cpu >= nr_cpu_ids))
		return NULL;

	/* get the cpufreq driver */
	read_lock_irqsave(&cpufreq_driver_lock, flags);

	if (cpufreq_driver) {
		/* get the CPU */
		policy = cpufreq_cpu_get_raw(cpu);
		if (policy)
			kobject_get(&policy->kobj);
	}

	read_unlock_irqrestore(&cpufreq_driver_lock, flags);

	return policy;
}
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EXPORT_SYMBOL_GPL(cpufreq_cpu_get);

/**
 * cpufreq_cpu_put: Decrements the usage count of a policy
 *
 * @policy: policy earlier returned by cpufreq_cpu_get().
 *
 * This decrements the kobject reference count incremented earlier by calling
 * cpufreq_cpu_get().
 */


void cpufreq_cpu_put(struct cpufreq_policy *policy)
{
	kobject_put(&policy->kobj);
}
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EXPORT_SYMBOL_GPL(cpufreq_cpu_put);

/*********************************************************************
 *            EXTERNALLY AFFECTING FREQUENCY CHANGES                 *
 *********************************************************************/

/**
 * adjust_jiffies - adjust the system "loops_per_jiffy"
 *
 * This function alters the system "loops_per_jiffy" for the clock
 * speed change. Note that loops_per_jiffy cannot be updated on SMP
 * systems as each CPU might be scaled differently. So, use the arch
 * per-CPU loops_per_jiffy value wherever possible.
 */


static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
{
#ifndef CONFIG_SMP
	static unsigned long l_p_j_ref;
	static unsigned int l_p_j_ref_freq;

	if (ci->flags & CPUFREQ_CONST_LOOPS)
		return;

	if (!l_p_j_ref_freq) {
		l_p_j_ref = loops_per_jiffy;
		l_p_j_ref_freq = ci->old;
		pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n",
			 l_p_j_ref, l_p_j_ref_freq);
	}
	if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) {
		loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq,
								ci->new);
		pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n",
			 loops_per_jiffy, ci->new);
	}
#endif
}

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static void __cpufreq_notify_transition(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs, unsigned int state)
{
	BUG_ON(irqs_disabled());

	if (cpufreq_disabled())
		return;

	freqs->flags = cpufreq_driver->flags;
	pr_debug("notification %u of frequency transition to %u kHz\n",
		 state, freqs->new);

	switch (state) {

	case CPUFREQ_PRECHANGE:
		/* detect if the driver reported a value as "old frequency"
                 * which is not equal to what the cpufreq core thinks is
                 * "old frequency".
                 */
		if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
			if ((policy) && (policy->cpu == freqs->cpu) &&
			    (policy->cur) && (policy->cur != freqs->old)) {
				pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
					 freqs->old, policy->cur);
				freqs->old = policy->cur;
			}
		}
		srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
				CPUFREQ_PRECHANGE, freqs);
		adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
		break;

	case CPUFREQ_POSTCHANGE:
		adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
		pr_debug("FREQ: %lu - CPU: %lu\n",
			 (unsigned long)freqs->new, (unsigned long)freqs->cpu);
		trace_cpu_frequency(freqs->new, freqs->cpu);
		srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
				CPUFREQ_POSTCHANGE, freqs);
		if (likely(policy) && likely(policy->cpu == freqs->cpu))
			policy->cur = freqs->new;
		break;
	}
}

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/**
 * cpufreq_notify_transition - call notifier chain and adjust_jiffies
 * on frequency transition.
 *
 * This function calls the transition notifiers and the "adjust_jiffies"
 * function. It is called twice on all CPU frequency changes that have
 * external effects.
 */


static void cpufreq_notify_transition(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs, unsigned int state)
{
	for_each_cpu(freqs->cpu, policy->cpus)
		__cpufreq_notify_transition(policy, freqs, state);
}

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/* Do post notifications when there are chances that transition has failed */


static void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs, int transition_failed)
{
	cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
	if (!transition_failed)
		return;

	swap(freqs->old, freqs->new);
	cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
	cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
}

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void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs)
{

	/*
         * Catch double invocations of _begin() which lead to self-deadlock.
         * ASYNC_NOTIFICATION drivers are left out because the cpufreq core
         * doesn't invoke _begin() on their behalf, and hence the chances of
         * double invocations are very low. Moreover, there are scenarios
         * where these checks can emit false-positive warnings in these
         * drivers; so we avoid that by skipping them altogether.
         */
	WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION)
				&& current == policy->transition_task);

wait:
	wait_event(policy->transition_wait, !policy->transition_ongoing);

	spin_lock(&policy->transition_lock);

	if (unlikely(policy->transition_ongoing)) {
		spin_unlock(&policy->transition_lock);
		goto wait;
	}

	policy->transition_ongoing = true;
	policy->transition_task = current;

	spin_unlock(&policy->transition_lock);

	cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
}
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EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin);



void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs, int transition_failed)
{
	if (unlikely(WARN_ON(!policy->transition_ongoing)))
		return;

	cpufreq_notify_post_transition(policy, freqs, transition_failed);

	policy->transition_ongoing = false;
	policy->transition_task = NULL;

	wake_up(&policy->transition_wait);
}
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EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end);

/*
 * Fast frequency switching status count.  Positive means "enabled", negative
 * means "disabled" and 0 means "not decided yet".
 */

static int cpufreq_fast_switch_count;
static DEFINE_MUTEX(cpufreq_fast_switch_lock);



static void cpufreq_list_transition_notifiers(void)
{
	struct notifier_block *nb;

	pr_info("Registered transition notifiers:\n");

	mutex_lock(&cpufreq_transition_notifier_list.mutex);

	for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next)
		pr_info("%pF\n", nb->notifier_call);

	mutex_unlock(&cpufreq_transition_notifier_list.mutex);
}

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/**
 * cpufreq_enable_fast_switch - Enable fast frequency switching for policy.
 * @policy: cpufreq policy to enable fast frequency switching for.
 *
 * Try to enable fast frequency switching for @policy.
 *
 * The attempt will fail if there is at least one transition notifier registered
 * at this point, as fast frequency switching is quite fundamentally at odds
 * with transition notifiers.  Thus if successful, it will make registration of
 * transition notifiers fail going forward.
 */


void cpufreq_enable_fast_switch(struct cpufreq_policy *policy)
{
	lockdep_assert_held(&policy->rwsem);

	if (!policy->fast_switch_possible)
		return;

	mutex_lock(&cpufreq_fast_switch_lock);
	if (cpufreq_fast_switch_count >= 0) {
		cpufreq_fast_switch_count++;
		policy->fast_switch_enabled = true;
	} else {
		pr_warn("CPU%u: Fast frequency switching not enabled\n",
			policy->cpu);
		cpufreq_list_transition_notifiers();
	}
	mutex_unlock(&cpufreq_fast_switch_lock);
}
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rafael j. wysocki
rafael j. wysocki
70
100.00%
1
100.00%
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70
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(cpufreq_enable_fast_switch);

/**
 * cpufreq_disable_fast_switch - Disable fast frequency switching for policy.
 * @policy: cpufreq policy to disable fast frequency switching for.
 */


void cpufreq_disable_fast_switch(struct cpufreq_policy *policy)
{
	mutex_lock(&cpufreq_fast_switch_lock);
	if (policy->fast_switch_enabled) {
		policy->fast_switch_enabled = false;
		if (!WARN_ON(cpufreq_fast_switch_count <= 0))
			cpufreq_fast_switch_count--;
	}
	mutex_unlock(&cpufreq_fast_switch_lock);
}
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rafael j. wysocki
rafael j. wysocki
49
100.00%
1
100.00%
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49
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(cpufreq_disable_fast_switch);

/*********************************************************************
 *                          SYSFS INTERFACE                          *
 *********************************************************************/


static ssize_t show_boost(struct kobject *kobj,
				 struct attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled);
}

Contributors
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lukasz majewski
lukasz majewski
31
96.88%
1
50.00%
rashika kheria
rashika kheria
1
3.12%
1
50.00%
Total
32
100.00%
2
100.00%



static ssize_t store_boost(struct kobject *kobj, struct attribute *attr,
				  const char *buf, size_t count)
{
	int ret, enable;

	ret = sscanf(buf, "%d", &enable);
	if (ret != 1 || enable < 0 || enable > 1)
		return -EINVAL;

	if (cpufreq_boost_trigger_state(enable)) {
		pr_err("%s: Cannot %s BOOST!\n",
		       __func__, enable ? "enable" : "disable");
		return -EINVAL;
	}

	pr_debug("%s: cpufreq BOOST %s\n",
		 __func__, enable ? "enabled" : "disabled");

	return count;
}
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lukasz majewski
lukasz majewski
101
100.00%
1
100.00%
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101
100.00%
1
100.00%


define_one_global_rw(boost);



static struct cpufreq_governor *find_governor(const char *str_governor)
{
	struct cpufreq_governor *t;

	for_each_governor(t)
		if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN))
			return t;

	return NULL;
}

Contributors
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jeremy fitzhardinge
jeremy fitzhardinge
39
92.86%
1
25.00%
viresh kumar
viresh kumar
2
4.76%
2
50.00%
rasmus villemoes
rasmus villemoes
1
2.38%
1
25.00%
Total
42
100.00%
4
100.00%

/**
 * cpufreq_parse_governor - parse a governor string
 */


static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
				struct cpufreq_governor **governor)
{
	int err = -EINVAL;

	if (cpufreq_driver->setpolicy) {
		if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
			*policy = CPUFREQ_POLICY_PERFORMANCE;
			err = 0;
		} else if (!strncasecmp(str_governor, "powersave",
						CPUFREQ_NAME_LEN)) {
			*policy = CPUFREQ_POLICY_POWERSAVE;
			err = 0;
		}
	} else {
		struct cpufreq_governor *t;

		mutex_lock(&cpufreq_governor_mutex);

		t = find_governor(str_governor);

		if (t == NULL) {
			int ret;

			mutex_unlock(&cpufreq_governor_mutex);
			ret = request_module("cpufreq_%s", str_governor);
			mutex_lock(&cpufreq_governor_mutex);

			if (ret == 0)
				t = find_governor(str_governor);
		}

		if (t != NULL) {
			*governor = t;
			err = 0;
		}

		mutex_unlock(&cpufreq_governor_mutex);
	}
	return err;
}

Contributors
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Tokens
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dave jones
dave jones
79
45.40%
7
38.89%
jeremy fitzhardinge
jeremy fitzhardinge
63
36.21%
2
11.11%
dominik brodowski
dominik brodowski
15
8.62%
1
5.56%
andrew morton
andrew morton
4
2.30%
1
5.56%
viresh kumar
viresh kumar
3
1.72%
2
11.11%
rafael j. wysocki
rafael j. wysocki
3
1.72%
1
5.56%
kees cook
kees cook
2
1.15%
1
5.56%
patrick mochel
patrick mochel
2
1.15%
1
5.56%
rasmus villemoes
rasmus villemoes
2
1.15%
1
5.56%
chris wright
chris wright
1
0.57%
1
5.56%
Total
174
100.00%
18
100.00%

/**
 * cpufreq_per_cpu_attr_read() / show_##file_name() -
 * print out cpufreq information
 *
 * Write out information from cpufreq_driver->policy[cpu]; object must be
 * "unsigned int".
 */


#define show_one(file_name, object)			\
static ssize_t show_##file_name                         \
(struct cpufreq_policy *policy, char *buf)              \
{                                                       \
        return sprintf(buf, "%u\n", policy->object);    \
}

show_one(cpuinfo_min_freq, cpuinfo.min_freq);
show_one(cpuinfo_max_freq, cpuinfo.max_freq);
show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
show_one(scaling_min_freq, min);
show_one(scaling_max_freq, max);



static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf)
{
	ssize_t ret;

	if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get)
		ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu));
	else
		ret = sprintf(buf, "%u\n", policy->cur);
	return ret;
}

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dirk brandewie
dirk brandewie
60
92.31%
1
50.00%
dave jones
dave jones
5
7.69%
1
50.00%
Total
65
100.00%
2
100.00%

static int cpufreq_set_policy(struct cpufreq_policy *policy,
				struct cpufreq_policy *new_policy);

/**
 * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
 */

#define store_one(file_name, object)			\
static ssize_t store_##file_name                                        \
(struct cpufreq_policy *policy, const char *buf, size_t count)          \
{                                                                       \
        int ret, temp;                                                  \
        struct cpufreq_policy new_policy;                               \
                                                                        \
        memcpy(&new_policy, policy, sizeof(*policy));                   \
                                                                        \
        ret = sscanf(buf, "%u", &new_policy.object);                    \
        if (ret != 1)                                                   \
                return -EINVAL;                                         \
                                                                        \
        temp = new_policy.object;                                       \
        ret = cpufreq_set_policy(policy, &new_policy);          \
        if (!ret)                                                       \
                policy->user_policy.object = temp;                      \
                                                                        \
        return ret ? ret : count;                                       \
}

store_one(scaling_min_freq, min);
store_one(scaling_max_freq, max);

/**
 * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
 */


static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
					char *buf)
{
	unsigned int cur_freq = __cpufreq_get(policy);
	if (!cur_freq)
		return sprintf(buf, "<unknown>");
	return sprintf(buf, "%u\n", cur_freq);
}

Contributors
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dave jones
dave jones
46
97.87%
3
75.00%
venkatesh pallipadi
venkatesh pallipadi
1
2.13%
1
25.00%
Total
47
100.00%
4
100.00%

/**
 * show_scaling_governor - show the current policy for the specified CPU
 */


static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
{
	if (policy->policy == CPUFREQ_POLICY_POWERSAVE)
		return sprintf(buf, "powersave\n");
	else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
		return sprintf(buf, "performance\n");
	else if (policy->governor)
		return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n",
				policy->governor->name);
	return -EINVAL;
}

Contributors
Person
Tokens
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Commits
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dave jones
dave jones
73
97.33%
3
60.00%
andrew morton
andrew morton
1
1.33%
1
20.00%
viresh kumar
viresh kumar
1
1.33%
1
20.00%
Total
75
100.00%
5
100.00%

/**
 * store_scaling_governor - store policy for the specified CPU
 */


static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
					const char *buf, size_t count)
{
	int ret;
	char	str_governor[16];
	struct cpufreq_policy new_policy;

	memcpy(&new_policy, policy, sizeof(*policy));

	ret = sscanf(buf, "%15s", str_governor);
	if (ret != 1)
		return -EINVAL;

	if (cpufreq_parse_governor(str_governor, &new_policy.policy,
						&new_policy.governor))
		return -EINVAL;

	ret = cpufreq_set_policy(policy, &new_policy);
	return ret ? ret : count;
}

Contributors
Person
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dave jones
dave jones
72
68.57%
3
30.00%
patrick mochel
patrick mochel
18
17.14%
1
10.00%
viresh kumar
viresh kumar
11
10.48%
3
30.00%
thomas renninger
thomas renninger
2
1.90%
1
10.00%
dominik brodowski
dominik brodowski
1
0.95%
1
10.00%
gautham r shenoy
gautham r shenoy
1
0.95%
1
10.00%
Total
105
100.00%
10
100.00%

/**
 * show_scaling_driver - show the cpufreq driver currently loaded
 */


static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
{
	return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
}

Contributors
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dave jones
dave jones
16
55.17%
1
25.00%
patrick mochel
patrick mochel
11
37.93%
1
25.00%
rafael j. wysocki
rafael j. wysocki
1
3.45%
1
25.00%
viresh kumar
viresh kumar
1
3.45%
1
25.00%
Total
29
100.00%
4
100.00%

/**
 * show_scaling_available_governors - show the available CPUfreq governors
 */


static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
						char *buf)
{
	ssize_t i = 0;
	struct cpufreq_governor *t;

	if (!has_target()) {
		i += sprintf(buf, "performance powersave");
		goto out;
	}

	for_each_governor(t) {
		if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
		    - (CPUFREQ_NAME_LEN + 2)))
			goto out;
		i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name);
	}
out:
	i += sprintf(&buf[i], "\n");
	return i;
}

Contributors
Person
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CommitProp
dave jones
dave jones
97
84.35%
4
44.44%
patrick mochel
patrick mochel
12
10.43%
1
11.11%
viresh kumar
viresh kumar
4
3.48%
3
33.33%
dominik brodowski
dominik brodowski
2
1.74%
1
11.11%
Total
115
100.00%
9
100.00%



ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf)
{
	ssize_t i = 0;
	unsigned int cpu;

	for_each_cpu(cpu, mask) {
		if (i)
			i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
		i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
		if (i >= (PAGE_SIZE - 5))
			break;
	}
	i += sprintf(&buf[i], "\n");
	return i;
}
Contributors
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dave jones
dave jones
99
92.52%
1
25.00%
rusty russell
rusty russell
5
4.67%
1
25.00%
darrick j. wong
darrick j. wong
2
1.87%
1
25.00%
lan tianyu
lan tianyu
1
0.93%
1
25.00%
Total
107
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(cpufreq_show_cpus);

/**
 * show_related_cpus - show the CPUs affected by each transition even if
 * hw coordination is in use
 */


static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf)
{
	return cpufreq_show_cpus(policy->related_cpus, buf);
}

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darrick j. wong
darrick j. wong
24
96.00%
1
50.00%
lan tianyu
lan tianyu
1
4.00%
1
50.00%
Total
25
100.00%
2
100.00%

/**
 * show_affected_cpus - show the CPUs affected by each transition
 */


static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
{
	return cpufreq_show_cpus(policy->cpus, buf);
}

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darrick j. wong
darrick j. wong
24
96.00%
1
50.00%
lan tianyu
lan tianyu
1
4.00%
1
50.00%
Total
25
100.00%
2
100.00%



static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
					const char *buf, size_t count)
{
	unsigned int freq = 0;
	unsigned int ret;

	if (!policy->governor || !policy->governor->store_setspeed)
		return -EINVAL;

	ret = sscanf(buf, "%u", &freq);
	if (ret != 1)
		return -EINVAL;

	policy->governor->store_setspeed(policy, freq);

	return count;
}

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venkatesh pallipadi
venkatesh pallipadi
78
93.98%
1
50.00%
chikama masaki
chikama masaki
5
6.02%
1
50.00%
Total
83
100.00%
2
100.00%



static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
{
	if (!policy->governor || !policy->governor->show_setspeed)
		return sprintf(buf, "<unsupported>\n");

	return policy->governor->show_setspeed(policy, buf);
}

Contributors
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venkatesh pallipadi
venkatesh pallipadi
44
89.80%
1
50.00%
chikama masaki
chikama masaki
5
10.20%
1
50.00%
Total
49
100.00%
2
100.00%

/**
 * show_bios_limit - show the current cpufreq HW/BIOS limitation
 */


static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
{
	unsigned int limit;
	int ret;
	if (cpufreq_driver->bios_limit) {
		ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
		if (!ret)
			return sprintf(buf, "%u\n", limit);
	}
	return sprintf(buf, "%u\n", policy->cpuinfo.max_freq);
}

Contributors
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thomas renninger
thomas renninger
66
90.41%
1
33.33%
rafael j. wysocki
rafael j. wysocki
4
5.48%
1
33.33%
nathan zimmer
nathan zimmer
3
4.11%
1
33.33%
Total
73
100.00%
3
100.00%

cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400);

cpufreq_freq_attr_ro(cpuinfo_min_freq);

cpufreq_freq_attr_ro(cpuinfo_max_freq);

cpufreq_freq_attr_ro(cpuinfo_transition_latency);

cpufreq_freq_attr_ro(scaling_available_governors);

cpufreq_freq_attr_ro(scaling_driver);

cpufreq_freq_attr_ro(scaling_cur_freq);

cpufreq_freq_attr_ro(bios_limit);

cpufreq_freq_attr_ro(related_cpus);

cpufreq_freq_attr_ro(affected_cpus);

cpufreq_freq_attr_rw(scaling_min_freq);

cpufreq_freq_attr_rw(scaling_max_freq);

cpufreq_freq_attr_rw(scaling_governor);

cpufreq_freq_attr_rw(scaling_setspeed);


static struct attribute *default_attrs[] = {
	&cpuinfo_min_freq.attr,
	&cpuinfo_max_freq.attr,
	&cpuinfo_transition_latency.attr,
	&scaling_min_freq.attr,
	&scaling_max_freq.attr,
	&affected_cpus.attr,
	&related_cpus.attr,
	&scaling_governor.attr,
	&scaling_driver.attr,
	&scaling_available_governors.attr,
	&scaling_setspeed.attr,
	NULL
};


#define to_policy(k) container_of(k, struct cpufreq_policy, kobj)

#define to_attr(a) container_of(a, struct freq_attr, attr)



static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
{
	struct cpufreq_policy *policy = to_policy(kobj);
	struct freq_attr *fattr = to_attr(attr);
	ssize_t ret;

	down_read(&policy->rwsem);
	ret = fattr->show(policy, buf);
	up_read(&policy->rwsem);

	return ret;
}

Contributors
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dave jones
dave jones
53
72.60%
3
37.50%
venkatesh pallipadi
venkatesh pallipadi
9
12.33%
1
12.50%
viresh kumar
viresh kumar
7
9.59%
2
25.00%
gautham r shenoy
gautham r shenoy
3
4.11%
1
12.50%
dominik brodowski
dominik brodowski
1
1.37%
1
12.50%
Total
73
100.00%
8
100.00%



static ssize_t store(struct kobject *kobj, struct attribute *attr,
		     const char *buf, size_t count)
{
	struct cpufreq_policy *policy = to_policy(kobj);
	struct freq_attr *fattr = to_attr(attr);
	ssize_t ret = -EINVAL;

	get_online_cpus();

	if (cpu_online(policy->cpu)) {
		down_write(&policy->rwsem);
		ret = fattr->store(policy, buf, count);
		up_write(&policy->rwsem);
	}

	put_online_cpus();

	return ret;
}

Contributors
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dave jones
dave jones
63
63.64%
5
45.45%
srivatsa s. bhat
srivatsa s. bhat
15
15.15%
1
9.09%
venkatesh pallipadi
venkatesh pallipadi
9
9.09%
1
9.09%
viresh kumar
viresh kumar
7
7.07%
2
18.18%
gautham r shenoy
gautham r shenoy
3
3.03%
1
9.09%
rafael j. wysocki
rafael j. wysocki
2
2.02%
1
9.09%
Total
99
100.00%
11
100.00%



static void cpufreq_sysfs_release(struct kobject *kobj)
{
	struct cpufreq_policy *policy = to_policy(kobj);
	pr_debug("last reference is dropped\n");
	complete(&policy->kobj_unregister);
}

Contributors
Person
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CommitProp
dave jones
dave jones
32
94.12%
4
66.67%
dominik brodowski
dominik brodowski
2
5.88%
2
33.33%
Total
34
100.00%
6
100.00%


static const struct sysfs_ops sysfs_ops = {
	.show	= show,
	.store	= store,
};


static struct kobj_type ktype_cpufreq = {
	.sysfs_ops	= &sysfs_ops,
	.default_attrs	= default_attrs,
	.release	= cpufreq_sysfs_release,
};



static int add_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu)
{
	struct device *cpu_dev;

	pr_debug("%s: Adding symlink for CPU: %u\n", __func__, cpu);

	if (!policy)
		return 0;

	cpu_dev = get_cpu_device(cpu);
	if (WARN_ON(!cpu_dev))
		return 0;

	return sysfs_create_link(&cpu_dev->kobj, &policy->kobj, "cpufreq");
}

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viresh kumar
viresh kumar
70
100.00%
1
100.00%
Total
70
100.00%
1
100.00%



static void remove_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu)
{
	struct device *cpu_dev;

	pr_debug("%s: Removing symlink for CPU: %u\n", __func__, cpu);

	cpu_dev = get_cpu_device(cpu);
	if (WARN_ON(!cpu_dev))
		return;

	sysfs_remove_link(&cpu_dev->kobj, "cpufreq");
}

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viresh kumar
viresh kumar
54
100.00%
1
100.00%
Total
54
100.00%
1
100.00%

/* Add/remove symlinks for all related CPUs */


static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy)
{
	unsigned int j;
	int ret = 0;

	/* Some related CPUs might not be present (physically hotplugged) */
	for_each_cpu(j, policy->real_cpus) {
		ret = add_cpu_dev_symlink(policy, j);
		if (ret)
			break;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
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CommitProp
dave jones
dave jones
32
69.57%
2
25.00%
viresh kumar
viresh kumar
9
19.57%
2
25.00%
rafael j. wysocki
rafael j. wysocki
3
6.52%
2
25.00%
alex chiang
alex chiang
1
2.17%
1
12.50%
dmitriy monakhov
dmitriy monakhov
1
2.17%
1
12.50%
Total
46
100.00%
8
100.00%



static void cpufreq_remove_dev_symlink(struct cpufreq_policy *policy)
{
	unsigned int j;

	/* Some related CPUs might not be present (physically hotplugged) */
	for_each_cpu(j, policy->real_cpus)
		remove_cpu_dev_symlink(policy, j);
}

Contributors
Person
Tokens
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Commits
CommitProp
viresh kumar
viresh kumar
27
93.10%
1
50.00%
rafael j. wysocki
rafael j. wysocki
2
6.90%
1
50.00%
Total
29
100.00%
2
100.00%



static int cpufreq_add_dev_interface(struct cpufreq_policy *policy)
{
	struct freq_attr **drv_attr;
	int ret = 0;

	/* set up files for this cpu device */
	drv_attr = cpufreq_driver->attr;
	while (drv_attr && *drv_attr) {
		ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
		if (ret)
			return ret;
		drv_attr++;
	}
	if (cpufreq_driver->get) {
		ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
		if (ret)
			return ret;
	}

	ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
	if (ret)
		return ret;

	if (cpufreq_driver->bios_limit) {
		ret = sysfs_create_file(&policy->kobj, &bios_limit.attr);
		if (ret)
			return ret;
	}

	return cpufreq_add_dev_symlink(policy);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
dave jones
dave jones
105
67.31%
1
14.29%
thomas renninger
thomas renninger
25
16.03%
1
14.29%
tomeu vizoso
tomeu vizoso
12
7.69%
1
14.29%
srivatsa s. bhat
srivatsa s. bhat
8
5.13%
1
14.29%
rafael j. wysocki
rafael j. wysocki
3
1.92%
1
14.29%
nathan zimmer
nathan zimmer
2
1.28%
1
14.29%
alex chiang
alex chiang
1
0.64%
1
14.29%
Total
156
100.00%
7
100.00%



__weak struct cpufreq_governor *cpufreq_default_governor(void)
{
	return NULL;
}

Contributors
Person
Tokens
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rafael j. wysocki
rafael j. wysocki
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%



static int cpufreq_init_policy(struct cpufreq_policy *policy)
{
	struct cpufreq_governor *gov = NULL;
	struct cpufreq_policy new_policy;

	memcpy(&new_policy, policy, sizeof(*policy));

	/* Update governor of new_policy to the governor used before hotplug */
	gov = find_governor(policy->last_governor);
	if (gov) {
		pr_debug("Restoring governor %s for cpu %d\n",
				policy->governor->name, policy->cpu);
	} else {
		gov = cpufreq_default_governor();
		if (!gov)
			return -ENODATA;
	}

	new_policy.governor = gov;

	/* Use the default policy if there is no last_policy. */
	if (cpufreq_driver->setpolicy) {
		if (policy->last_policy)
			new_policy.policy = policy->last_policy;
		else
			cpufreq_parse_governor(gov->name, &new_policy.policy,
					       NULL);
	}
	/* set default policy */
	return cpufreq_set_policy(policy, &new_policy);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
viresh kumar
viresh kumar
53
38.41%
6
50.00%
dave jones
dave jones
20
14.49%
2
16.67%
jason baron
jason baron
19
13.77%
1
8.33%
srinivas pandruvada
srinivas pandruvada
18
13.04%
1
8.33%
rafael j. wysocki
rafael j. wysocki
15
10.87%
1
8.33%
srivatsa s. bhat
srivatsa s. bhat
13
9.42%
1
8.33%
Total
138
100.00%
12
100.00%



static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
{
	int ret = 0;

	/* Has this CPU been taken care of already? */
	if (cpumask_test_cpu(cpu, policy->cpus))
		return 0;

	down_write(&policy->rwsem);
	if (has_target())
		cpufreq_stop_governor(policy);

	cpumask_set_cpu(cpu, policy->cpus);

	if (has_target()) {
		ret = cpufreq_start_governor(policy);
		if (ret)
			pr_err("%s: Failed to start governor\n", __func__);
	}
	up_write(&policy->rwsem);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
viresh kumar
viresh kumar
89
90.82%
8
61.54%
stratos karafotis
stratos karafotis
4
4.08%
1
7.69%
rafael j. wysocki
rafael j. wysocki
2
2.04%
2
15.38%
dominik brodowski
dominik brodowski
2
2.04%
1
7.69%
patrick mochel
patrick mochel
1
1.02%
1
7.69%
Total
98
100.00%
13
100.00%



static void handle_update(struct work_struct *work)
{
	struct cpufreq_policy *policy =
		container_of(work, struct cpufreq_policy, update);
	unsigned int cpu = policy->cpu;
	pr_debug("handle_update for cpu %u called\n", cpu);
	cpufreq_update_policy(cpu);
}

Contributors
Person
Tokens
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viresh kumar
viresh kumar
46
100.00%
2
100.00%
Total
46
100.00%
2
100.00%



static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
{
	struct device *dev = get_cpu_device(cpu);
	struct cpufreq_policy *policy;
	int ret;

	if (WARN_ON(!dev))
		return NULL;

	policy = kzalloc(sizeof(*policy), GFP_KERNEL);
	if (!policy)
		return NULL;

	if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
		goto err_free_policy;

	if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
		goto err_free_cpumask;

	if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
		goto err_free_rcpumask;

	ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
				   cpufreq_global_kobject, "policy%u", cpu);
	if (ret) {
		pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret);
		goto err_free_real_cpus;
	}

	INIT_LIST_HEAD(&policy->policy_list);
	init_rwsem(&policy->rwsem);
	spin_lock_init(&policy->transition_lock);
	init_waitqueue_head(&policy->transition_wait);
	init_completion(&policy->kobj_unregister);
	INIT_WORK(&policy->update, handle_update);

	policy->cpu = cpu;
	return policy;

err_free_real_cpus:
	free_cpumask_var(policy->real_cpus);
err_free_rcpumask:
	free_cpumask_var(policy->related_cpus);
err_free_cpumask:
	free_cpumask_var(policy->cpus);
err_free_policy:
	kfree(policy);

	return NULL;
}

Contributors
Person
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CommitProp
viresh kumar
viresh kumar
100
41.15%
7
50.00%
srivatsa s. bhat
srivatsa s. bhat
99
40.74%
3
21.43%
rafael j. wysocki
rafael j. wysocki
32
13.17%
2
14.29%
lukasz majewski
lukasz majewski
8
3.29%
1
7.14%
geert uytterhoeven
geert uytterhoeven
4
1.65%
1
7.14%
Total
243
100.00%
14
100.00%



static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy, bool notify)
{
	struct kobject *kobj;
	struct completion *cmp;

	if (notify)
		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
					     CPUFREQ_REMOVE_POLICY, policy);

	down_write(&policy->rwsem);
	cpufreq_remove_dev_symlink(policy);
	kobj = &policy->kobj;
	cmp = &policy->kobj_unregister;
	up_write(&policy->rwsem);
	kobject_put(kobj);

	/*
         * We need to make sure that the underlying kobj is
         * actually not referenced anymore by anybody before we
         * proceed with unloading.
         */
	pr_debug("waiting for dropping of refcount\n");
	wait_for_completion(cmp);
	pr_debug("wait complete\n");
}

Contributors
Person
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viresh kumar
viresh kumar
94
100.00%
4
100.00%
Total
94
100.00%
4
100.00%



static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify)
{
	unsigned long flags;
	int cpu;

	/* Remove policy from list */
	write_lock_irqsave(&cpufreq_driver_lock, flags);
	list_del(&policy->policy_list);

	for_each_cpu(cpu, policy->related_cpus)
		per_cpu(cpufreq_cpu_data, cpu) = NULL;
	write_unlock_irqrestore(&cpufreq_driver_lock, flags);

	cpufreq_policy_put_kobj(policy, notify);
	free_cpumask_var(policy->real_cpus);
	free_cpumask_var(policy->related_cpus);
	free_cpumask_var(policy->cpus);
	kfree(policy);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
viresh kumar
viresh kumar
57
60.64%
2
50.00%
srivatsa s. bhat
srivatsa s. bhat
30
31.91%
1
25.00%
rafael j. wysocki
rafael j. wysocki
7
7.45%
1
25.00%
Total
94
100.00%
4
100.00%



static int cpufreq_online(unsigned int cpu)
{
	struct cpufreq_policy *policy;
	bool new_policy;
	unsigned long flags;
	unsigned int j;
	int ret;

	pr_debug("%s: bringing CPU%u online\n", __func__, cpu);

	/* Check if this CPU already has a policy to manage it */
	policy = per_cpu(cpufreq_cpu_data, cpu);
	if (policy) {
		WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus));
		if (!policy_is_inactive(policy))
			return cpufreq_add_policy_cpu(policy, cpu);

		/* This is the only online CPU for the policy.  Start over. */
		new_policy = false;
		down_write(&policy->rwsem);
		policy->cpu = cpu;
		policy->governor = NULL;
		up_write(&policy->rwsem);
	} else {
		new_policy = true;
		policy = cpufreq_policy_alloc(cpu);
		if (!policy)
			return -ENOMEM;
	}

	cpumask_copy(policy->cpus, cpumask_of(cpu));

	/* call driver. From then on the cpufreq must be able
         * to accept all calls to ->verify and ->setpolicy for this CPU
         */
	ret = cpufreq_driver->init(policy);
	if (ret) {
		pr_debug("initialization failed\n");
		goto out_free_policy;
	}

	down_write(&policy->rwsem);

	if (new_policy) {
		/* related_cpus should at least include policy->cpus. */
		cpumask_copy(policy->related_cpus, policy->cpus);
		/* Remember CPUs present at the policy creation time. */
		cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask);
	}

	/*
         * affected cpus must always be the one, which are online. We aren't
         * managing offline cpus here.
         */
	cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);

	if (new_policy) {
		policy->user_policy.min = policy->min;
		policy->user_policy.max = policy->max;

		write_lock_irqsave(&cpufreq_driver_lock, flags);
		for_each_cpu(j, policy->related_cpus)
			per_cpu(cpufreq_cpu_data, j) = policy;
		write_unlock_irqrestore(&cpufreq_driver_lock, flags);
	}

	if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
		policy->cur = cpufreq_driver->get(policy->cpu);
		if (!policy->cur) {
			pr_err("%s: ->get() failed\n", __func__);
			goto out_exit_policy;
		}
	}

	/*
         * Sometimes boot loaders set CPU frequency to a value outside of
         * frequency table present with cpufreq core. In such cases CPU might be
         * unstable if it has to run on that frequency for long duration of time
         * and so its better to set it to a frequency which is specified in
         * freq-table. This also makes cpufreq stats inconsistent as
         * cpufreq-stats would fail to register because current frequency of CPU
         * isn't found in freq-table.
         *
         * Because we don't want this change to effect boot process badly, we go
         * for the next freq which is >= policy->cur ('cur' must be set by now,
         * otherwise we will end up setting freq to lowest of the table as 'cur'
         * is initialized to zero).
         *
         * We are passing target-freq as "policy->cur - 1" otherwise
         * __cpufreq_driver_target() would simply fail, as policy->cur will be
         * equal to target-freq.
         */
	if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
	    && has_target()) {
		/* Are we running at unknown frequency ? */
		ret = cpufreq_frequency_table_get_index(policy, policy->cur);
		if (ret == -EINVAL) {
			/* Warn user and fix it */
			pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n",
				__func__, policy->cpu, policy->cur);
			ret = __cpufreq_driver_target(policy, policy->cur - 1,
				CPUFREQ_RELATION_L);

			/*
                         * Reaching here after boot in a few seconds may not
                         * mean that system will remain stable at "unknown"
                         * frequency for longer duration. Hence, a BUG_ON().
                         */
			BUG_ON(ret);
			pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n",
				__func__, policy->cpu, policy->cur);
		}
	}

	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
				     CPUFREQ_START, policy);

	if (new_policy) {
		ret = cpufreq_add_dev_interface(policy);
		if (ret)
			goto out_exit_policy;
		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
				CPUFREQ_CREATE_POLICY, policy);

		write_lock_irqsave(&cpufreq_driver_lock, flags);
		list_add(&policy->policy_list, &cpufreq_policy_list);
		write_unlock_irqrestore(&cpufreq_driver_lock, flags);
	}

	ret = cpufreq_init_policy(policy);
	if (ret) {
		pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
		       __func__, cpu, ret);
		/* cpufreq_policy_free() will notify based on this */
		new_policy = false;
		goto out_exit_policy;
	}

	up_write(&policy->rwsem);

	kobject_uevent(&policy->kobj, KOBJ_ADD);

	/* Callback for handling stuff after policy is ready */
	if (cpufreq_driver->ready)
		cpufreq_driver->ready(policy);

	pr_debug("initialization complete\n");

	return 0;

out_exit_policy:
	up_write(&policy->rwsem);

	if (cpufreq_driver->exit)
		cpufreq_driver->exit(policy);
out_free_policy:
	cpufreq_policy_free(policy, !new_policy);
	return ret;
}

Contributors
Person
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viresh kumar
viresh kumar
336
56.47%
25
43.10%
rafael j. wysocki
rafael j. wysocki
101
16.97%
10
17.24%
dave jones
dave jones
69
11.60%
7
12.07%
lukasz majewski
lukasz majewski
27
4.54%
1
1.72%
srivatsa s. bhat
srivatsa s. bhat
14
2.35%
4
6.90%
greg kroah-hartman
greg kroah-hartman
10
1.68%
1
1.72%
prarit bhargava
prarit bhargava
8
1.34%
1
1.72%
tomeu vizoso
tomeu vizoso
8
1.34%
1
1.72%
dominik brodowski
dominik brodowski
7
1.18%
2
3.45%
venkatesh pallipadi
venkatesh pallipadi
4
0.67%
1
1.72%
ahmed s. darwish
ahmed s. darwish
4
0.67%
1
1.72%
rusty russell
rusty russell
3
0.50%
1
1.72%
mathieu desnoyers
mathieu desnoyers
2
0.34%
1
1.72%
thomas renninger
thomas renninger
1
0.17%
1
1.72%
patrick mochel
patrick mochel
1
0.17%
1
1.72%
Total
595
100.00%
58
100.00%

/**
 * cpufreq_add_dev - the cpufreq interface for a CPU device.
 * @dev: CPU device.
 * @sif: Subsystem interface structure pointer (not used)
 */


static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
{
	struct cpufreq_policy *policy;
	unsigned cpu = dev->id;

	dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu);

	if (cpu_online(cpu))
		return cpufreq_online(cpu);

	/*
         * A hotplug notifier will follow and we will handle it as CPU online
         * then.  For now, just create the sysfs link, unless there is no policy
         * or the link is already present.
         */
	policy = per_cpu(cpufreq_cpu_data, cpu);
	if (!policy || cpumask_test_and_set_cpu(cpu, policy->real_cpus))
		return 0;

	return add_cpu_dev_symlink(policy, cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rafael j. wysocki
rafael j. wysocki
73
83.91%
2
25.00%
viresh kumar
viresh kumar
8
9.20%
3
37.50%
dave jones
dave jones
4
4.60%
2
25.00%
prarit bhargava
prarit bhargava
2
2.30%
1
12.50%
Total
87
100.00%
8
100.00%



static void cpufreq_offline(unsigned int cpu)
{
	struct cpufreq_policy *policy;
	int ret;

	pr_debug("%s: unregistering CPU %u\n", __func__, cpu);

	policy = cpufreq_cpu_get_raw(cpu);
	if (!policy) {
		pr_debug("%s: No cpu_data found\n", __func__);
		return;
	}

	down_write(&policy->rwsem);
	if (has_target())
		cpufreq_stop_governor(policy);

	cpumask_clear_cpu(cpu, policy->cpus);

	if (policy_is_inactive(policy)) {
		if (has_target())
			strncpy(policy->last_governor, policy->governor->name,
				CPUFREQ_NAME_LEN);
		else
			policy->last_policy = policy->policy;
	} else if (cpu == policy->cpu) {
		/* Nominate new CPU */
		policy->cpu = cpumask_any(policy->cpus);
	}

	/* Start governor again for active policy */
	if (!policy_is_inactive(policy)) {
		if (has_target()) {
			ret = cpufreq_start_governor(policy);
			if (ret)
				pr_err("%s: Failed to start governor\n", __func__);
		}

		goto unlock;
	}

	if (cpufreq_driver->stop_cpu)
		cpufreq_driver->stop_cpu(policy);

	if (has_target())
		cpufreq_exit_governor(policy);

	/*
         * Perform the ->exit() even during light-weight tear-down,
         * since this is a core component, and is essential for the
         * subsequent light-weight ->init() to succeed.
         */
	if (cpufreq_driver->exit) {
		cpufreq_driver->exit(policy);
		policy->freq_table = NULL;
	}

unlock:
	up_write(&policy->rwsem);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
viresh kumar
viresh kumar
144
62.34%
13
38.24%
dave jones
dave jones
32
13.85%
6
17.65%
srinivas pandruvada
srinivas pandruvada
17
7.36%
2
5.88%
dirk brandewie
dirk brandewie
13
5.63%
1
2.94%
rafael j. wysocki
rafael j. wysocki
9
3.90%
5
14.71%
americo wang
americo wang
4
1.73%
1
2.94%
stratos karafotis
stratos karafotis
4
1.73%
1
2.94%
mike travis
mike travis
2
0.87%
1
2.94%
jacob shin
jacob shin
2
0.87%
1
2.94%
patrick mochel
patrick mochel
2
0.87%
1
2.94%
dominik brodowski
dominik brodowski
1
0.43%
1
2.94%
srivatsa s. bhat
srivatsa s. bhat
1
0.43%
1
2.94%
Total
231
100.00%
34
100.00%

/**
 * cpufreq_remove_dev - remove a CPU device
 *
 * Removes the cpufreq interface for a CPU device.
 */


static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
{
	unsigned int cpu = dev->id;
	struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);

	if (!policy)
		return;

	if (cpu_online(cpu))
		cpufreq_offline(cpu);

	cpumask_clear_cpu(cpu, policy->real_cpus);
	remove_cpu_dev_symlink(policy, cpu);

	if (cpumask_empty(policy->real_cpus))
		cpufreq_policy_free(policy, true);
}

Contributors
Person
Tokens
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CommitProp
viresh kumar
viresh kumar
47
54.65%
4
50.00%
rafael j. wysocki
rafael j. wysocki
17
19.77%
2
25.00%
venkatesh pallipadi
venkatesh pallipadi
14
16.28%
1
12.50%
kay sievers
kay sievers
8
9.30%
1
12.50%
Total
86
100.00%
8
100.00%

/**
 *      cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're
 *      in deep trouble.
 *      @policy: policy managing CPUs
 *      @new_freq: CPU frequency the CPU actually runs at
 *
 *      We adjust to current frequency first, and need to clean up later.
 *      So either call to cpufreq_update_policy() or schedule handle_update()).
 */


static void cpufreq_out_of_sync(struct cpufreq_policy *policy,
				unsigned int new_freq)
{
	struct cpufreq_freqs freqs;

	pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n",
		 policy->cur, new_freq);

	freqs.old = policy->cur;
	freqs.new = new_freq;

	cpufreq_freq_transition_begin(policy, &freqs);
	cpufreq_freq_transition_end(policy, &freqs, 0);
}

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Tokens
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dave jones
dave jones
43
69.35%
5
45.45%
viresh kumar
viresh kumar
13
20.97%
3
27.27%
david howells
david howells
4
6.45%
1
9.09%
dominik brodowski
dominik brodowski
1
1.61%
1
9.09%
joe perches
joe perches
1
1.61%
1
9.09%
Total
62
100.00%
11
100.00%

/**
 * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur
 * @cpu: CPU number
 *
 * This is the last known freq, without actually getting it from the driver.
 * Return value will be same as what is shown in scaling_cur_freq in sysfs.
 */


unsigned int cpufreq_quick_get(unsigned int cpu)
{
	struct cpufreq_policy *policy;
	unsigned int ret_freq = 0;
	unsigned long flags;

	read_lock_irqsave(&cpufreq_driver_lock, flags);

	if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) {
		ret_freq = cpufreq_driver->get(cpu);
		read_unlock_irqrestore(&cpufreq_driver_lock, flags);
		return ret_freq;
	}

	read_unlock_irqrestore(&cpufreq_driver_lock, flags);

	policy = cpufreq_cpu_get(cpu);
	if (policy) {
		ret_freq = policy->cur;
		cpufreq_cpu_put(policy);
	}

	return ret_freq;
}
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venkatesh pallipadi
venkatesh pallipadi
38
37.25%
1
16.67%
richard cochran
richard cochran
35
34.31%
1
16.67%
dirk brandewie
dirk brandewie
20
19.61%
1
16.67%
rafael j. wysocki
rafael j. wysocki
5
4.90%
1
16.67%
gautham r shenoy
gautham r shenoy
3
2.94%
1
16.67%
nathan zimmer
nathan zimmer
1
0.98%
1
16.67%
Total
102
100.00%
6
100.00%


EXPORT_SYMBOL(cpufreq_quick_get);

/**
 * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU
 * @cpu: CPU number
 *
 * Just return the max possible frequency for a given CPU.
 */


unsigned int cpufreq_quick_get_max(unsigned int cpu)
{
	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
	unsigned int ret_freq = 0;

	if (policy) {
		ret_freq = policy->max;
		cpufreq_cpu_put(policy);
	}

	return ret_freq;
}
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jesse barnes
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1
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46
100.00%
1
100.00%


EXPORT_SYMBOL(cpufreq_quick_get_max);



static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
{
	unsigned int ret_freq = 0;

	if (!cpufreq_driver->get)
		return ret_freq;

	ret_freq = cpufreq_driver->get(policy->cpu);

	/*
         * Updating inactive policies is invalid, so avoid doing that.  Also
         * if fast frequency switching is used with the given policy, the check
         * against policy->cur is pointless, so skip it in that case too.
         */
	if (unlikely(policy_is_inactive(policy)) || policy->fast_switch_enabled)
		return ret_freq;

	if (ret_freq && policy->cur &&
		!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
		/* verify no discrepancy between actual and
                                        saved value exists */
		if (unlikely(ret_freq != policy->cur)) {
			cpufreq_out_of_sync(policy, ret_freq);
			schedule_work(&policy->update);
		}
	}

	return ret_freq;
}

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dave jones
46
42.59%
1
11.11%
dominik brodowski
dominik brodowski
19
17.59%
1
11.11%
viresh kumar
viresh kumar
17
15.74%
2
22.22%
rafael j. wysocki
rafael j. wysocki
10
9.26%
2
22.22%
venkatesh pallipadi
venkatesh pallipadi
9
8.33%
1
11.11%
gautham r shenoy
gautham r shenoy
5
4.63%
1
11.11%
nathan zimmer
nathan zimmer
2
1.85%
1
11.11%
Total
108
100.00%
9
100.00%

/**
 * cpufreq_get - get the current CPU frequency (in kHz)
 * @cpu: CPU number
 *
 * Get the CPU current (static) CPU frequency
 */


unsigned int cpufreq_get(unsigned int cpu)
{
	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
	unsigned int ret_freq = 0;

	if (policy) {
		down_read(&policy->rwsem);
		ret_freq = __cpufreq_get(policy);
		up_read(&policy->rwsem);

		cpufreq_cpu_put(policy);
	}

	return ret_freq;
}
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venkatesh pallipadi
venkatesh pallipadi
27
42.86%
1
12.50%
viresh kumar
viresh kumar
22
34.92%
3
37.50%
aaron plattner
aaron plattner
5
7.94%
1
12.50%
dominik brodowski
dominik brodowski
5
7.94%
1
12.50%
dave jones
dave jones
3
4.76%
1
12.50%
gautham r shenoy
gautham r shenoy
1
1.59%
1
12.50%
Total
63
100.00%
8
100.00%


EXPORT_SYMBOL(cpufreq_get);



static unsigned int cpufreq_update_current_freq(struct cpufreq_policy *policy)
{
	unsigned int new_freq;

	if (cpufreq_suspended)
		return 0;

	new_freq = cpufreq_driver->get(policy->cpu);
	if (!new_freq)
		return 0;

	if (!policy->cur) {
		pr_debug("cpufreq: Driver did not initialize current freq\n");
		policy->cur = new_freq;
	} else if (policy->cur != new_freq && has_target()) {
		cpufreq_out_of_sync(policy, new_freq);
	}

	return new_freq;
}

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static struct subsys_interface cpufreq_interface = {
	.name		= "cpufreq",
	.subsys		= &cpu_subsys,
	.add_dev	= cpufreq_add_dev,
	.remove_dev	= cpufreq_remove_dev,
};

/*
 * In case platform wants some specific frequency to be configured
 * during suspend..
 */


int cpufreq_generic_suspend(struct cpufreq_policy *policy)
{
	int ret;

	if (!policy->suspend_freq) {
		pr_debug("%s: suspend_freq not defined\n", __func__);
		return 0;
	}

	pr_debug("%s: Setting suspend-freq: %u\n", __func__,
			policy->suspend_freq);

	ret = __cpufreq_driver_target(policy, policy->suspend_freq,
			CPUFREQ_RELATION_H);
	if (ret)
		pr_err("%s: unable to set suspend-freq: %u. err: %d\n",
				__func__, policy->suspend_freq, ret);

	return ret;
}
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viresh kumar
viresh kumar
42
55.26%
2
33.33%
benjamin herrenschmidt
benjamin herrenschmidt
29
38.16%
1
16.67%
bartlomiej zolnierkiewicz
bartlomiej zolnierkiewicz
3
3.95%
1
16.67%
dave jones
dave jones
1
1.32%
1
16.67%
rafael j. wysocki
rafael j. wysocki
1
1.32%
1
16.67%
Total
76
100.00%
6
100.00%


EXPORT_SYMBOL(cpufreq_generic_suspend);

/**
 * cpufreq_suspend() - Suspend CPUFreq governors
 *
 * Called during system wide Suspend/Hibernate cycles for suspending governors
 * as some platforms can't change frequency after this point in suspend cycle.
 * Because some of the devices (like: i2c, regulators, etc) they use for
 * changing frequency are suspended quickly after this point.
 */


void cpufreq_suspend(void)
{
	struct cpufreq_policy *policy;

	if (!cpufreq_driver)
		return;

	if (!has_target() && !cpufreq_driver->suspend)
		goto suspend;

	pr_debug("%s: Suspending Governors\n", __func__);

	for_each_active_policy(policy) {
		if (has_target()) {
			down_write(&policy->rwsem);
			cpufreq_stop_governor(policy);
			up_write(&policy->rwsem);
		}

		if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy))
			pr_err("%s: Failed to suspend driver: %p\n", __func__,
				policy);
	}

suspend:
	cpufreq_suspended = true;
}

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viresh kumar
viresh kumar
55
54.46%
5
27.78%
rafael j. wysocki
rafael j. wysocki
19
18.81%
4
22.22%
dave jones
dave jones
14
13.86%
5
27.78%
benjamin herrenschmidt
benjamin herrenschmidt
8
7.92%
1
5.56%
nathan zimmer
nathan zimmer
3
2.97%
1
5.56%
dominik brodowski
dominik brodowski
2
1.98%
2
11.11%
Total
101
100.00%
18
100.00%

/**
 * cpufreq_resume() - Resume CPUFreq governors
 *
 * Called during system wide Suspend/Hibernate cycle for resuming governors that
 * are suspended with cpufreq_suspend().
 */


void cpufreq_resume(void)
{
	struct cpufreq_policy *policy;
	int ret;

	if (!cpufreq_driver)
		return;

	cpufreq_suspended = false;

	if (!has_target() && !cpufreq_driver->resume)
		return;

	pr_debug("%s: Resuming Governors\n", __func__);

	for_each_active_policy(policy) {
		if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) {
			pr_err("%s: Failed to resume driver: %p\n", __func__,
				policy);
		} else if (has_target()) {
			down_write(&policy->rwsem);
			ret = cpufreq_start_governor(policy);
			up_write(&policy->rwsem);

			if (ret)
				pr_err("%s: Failed to start governor for policy: %p\n",
				       __func__, policy);
		}
	}
}

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viresh kumar
viresh kumar
72
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6
31.58%
dave jones
dave jones
21
17.80%
6
31.58%
rafael j. wysocki
rafael j. wysocki
14
11.86%
3
15.79%
andres salomon
andres salomon
5
4.24%
1
5.26%
lan tianyu
lan tianyu
4
3.39%
1
5.26%
dominik brodowski
dominik brodowski
2
1.69%
2
10.53%
Total
118
100.00%
19
100.00%

/**
 *      cpufreq_get_current_driver - return current driver's name
 *
 *      Return the name string of the currently loaded cpufreq driver
 *      or NULL, if none.
 */


const char *cpufreq_get_current_driver(void)
{
	if (cpufreq_driver)
		return cpufreq_driver->name;

	return NULL;
}
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rafael j. wysocki
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47.62%
1
33.33%
borislav petkov
borislav petkov
8
38.10%
1
33.33%
nathan zimmer
nathan zimmer
3
14.29%
1
33.33%
Total
21
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);

/**
 *      cpufreq_get_driver_data - return current driver data
 *
 *      Return the private data of the currently loaded cpufreq
 *      driver, or NULL if no cpufreq driver is loaded.
 */


void *cpufreq_get_driver_data(void)
{
	if (cpufreq_driver)
		return cpufreq_driver->driver_data;

	return NULL;
}
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thomas petazzoni
thomas petazzoni
20
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1
100.00%
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20
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1
100.00%


EXPORT_SYMBOL_GPL(cpufreq_get_driver_data);

/*********************************************************************
 *                     NOTIFIER LISTS INTERFACE                      *
 *********************************************************************/

/**
 *      cpufreq_register_notifier - register a driver with cpufreq
 *      @nb: notifier function to register
 *      @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
 *
 *      Add a driver to one of two lists: either a list of drivers that
 *      are notified about clock rate changes (once before and once after
 *      the transition), or a list of drivers that are notified about
 *      changes in cpufreq policy.
 *
 *      This function may sleep, and has the same return conditions as
 *      blocking_notifier_chain_register.
 */


int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
{
	int ret;

	if (cpufreq_disabled())
		return -EINVAL;

	WARN_ON(!init_cpufreq_transition_notifier_list_called);

	switch (list) {
	case CPUFREQ_TRANSITION_NOTIFIER:
		mutex_lock(&cpufreq_fast_switch_lock);

		if (cpufreq_fast_switch_count > 0) {
			mutex_unlock(&cpufreq_fast_switch_lock);
			return -EBUSY;
		}
		ret = srcu_notifier_chain_register(
				&cpufreq_transition_notifier_list, nb);
		if (!ret)
			cpufreq_fast_switch_count--;

		mutex_unlock(&cpufreq_fast_switch_lock);
		break;
	case CPUFREQ_POLICY_NOTIFIER:
		ret = blocking_notifier_chain_register(
				&cpufreq_policy_notifier_list, nb);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}
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dave jones
dave jones
58
51.33%
4
44.44%
rafael j. wysocki
rafael j. wysocki
38
33.63%
1
11.11%
dirk brandewie
dirk brandewie
9
7.96%
1
11.11%
cesar eduardo barros
cesar eduardo barros
6
5.31%
1
11.11%
alan stern
alan stern
2
1.77%
2
22.22%
Total
113
100.00%
9
100.00%


EXPORT_SYMBOL(cpufreq_register_notifier);

/**
 *      cpufreq_unregister_notifier - unregister a driver with cpufreq
 *      @nb: notifier block to be unregistered
 *      @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
 *
 *      Remove a driver from the CPU frequency notifier list.
 *
 *      This function may sleep, and has the same return conditions as
 *      blocking_notifier_chain_unregister.
 */


int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
{
	int ret;

	if (cpufreq_disabled())
		return -EINVAL;

	switch (list) {
	case CPUFREQ_TRANSITION_NOTIFIER:
		mutex_lock(&cpufreq_fast_switch_lock);

		ret = srcu_notifier_chain_unregister(
				&cpufreq_transition_notifier_list, nb);
		if (!ret && !WARN_ON(cpufreq_fast_switch_count >= 0))
			cpufreq_fast_switch_count++;

		mutex_unlock(&cpufreq_fast_switch_lock);
		break;
	case CPUFREQ_POLICY_NOTIFIER:
		ret = blocking_notifier_chain_unregister(
				&cpufreq_policy_notifier_list, nb);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}
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dave jones
dave jones
58
59.79%
2
33.33%
rafael j. wysocki
rafael j. wysocki
28
28.87%
1
16.67%
dirk brandewie
dirk brandewie
9
9.28%
1
16.67%
alan stern
alan stern
2
2.06%
2
33.33%
Total
97
100.00%
6
100.00%


EXPORT_SYMBOL(cpufreq_unregister_notifier);


/*********************************************************************
 *                              GOVERNORS                            *
 *********************************************************************/

/**
 * cpufreq_driver_fast_switch - Carry out a fast CPU frequency switch.
 * @policy: cpufreq policy to switch the frequency for.
 * @target_freq: New frequency to set (may be approximate).
 *
 * Carry out a fast frequency switch without sleeping.
 *
 * The driver's ->fast_switch() callback invoked by this function must be
 * suitable for being called from within RCU-sched read-side critical sections
 * and it is expected to select the minimum available frequency greater than or
 * equal to @target_freq (CPUFREQ_RELATION_L).
 *
 * This function must not be called if policy->fast_switch_enabled is unset.
 *
 * Governors calling this function must guarantee that it will never be invoked
 * twice in parallel for the same policy and that it will never be called in
 * parallel with either ->target() or ->target_index() for the same policy.
 *
 * If CPUFREQ_ENTRY_INVALID is returned by the driver's ->fast_switch()
 * callback to indicate an error condition, the hardware configuration must be
 * preserved.
 */


unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
					unsigned int target_freq)
{
	target_freq = clamp_val(target_freq, policy->min, policy->max);

	return cpufreq_driver->fast_switch(policy, target_freq);
}
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100.00%


EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch);

/* Must set freqs->new to intermediate frequency */


static int __target_intermediate(struct cpufreq_policy *policy,
				 struct cpufreq_freqs *freqs, int index)
{
	int ret;

	freqs->new = cpufreq_driver->get_intermediate(policy, index);

	/* We don't need to switch to intermediate freq */
	if (!freqs->new)
		return 0;

	pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n",
		 __func__, policy->cpu, freqs->old, freqs->new);

	cpufreq_freq_transition_begin(policy, freqs);
	ret = cpufreq_driver->target_intermediate(policy, index);
	cpufreq_freq_transition_end(policy, freqs, ret);

	if (ret)
		pr_err("%s: Failed to change to intermediate frequency: %d\n",
		       __func__, ret);

	return ret;
}

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static int __target_index(struct cpufreq_policy *policy,
			  struct cpufreq_frequency_table *freq_table, int index)
{
	struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0};
	unsigned int intermediate_freq = 0;
	int retval = -EINVAL;
	bool notify;

	notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION);
	if (notify) {
		/* Handle switching to intermediate frequency */
		if (cpufreq_driver->get_intermediate) {
			retval = __target_intermediate(policy, &freqs, index);
			if (retval)
				return retval;

			intermediate_freq = freqs.new;
			/* Set old freq to intermediate */
			if (intermediate_freq)
				freqs.old = freqs.new;
		}

		freqs.new = freq_table[index].frequency;
		pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n",
			 __func__, policy->cpu, freqs.old, freqs.new);

		cpufreq_freq_transition_begin(policy, &freqs);
	}

	retval = cpufreq_driver->target_index(policy, index);
	if (retval)
		pr_err("%s: Failed to change cpu frequency: %d\n", __func__,
		       retval);

	if (notify) {
		cpufreq_freq_transition_end(policy, &freqs, retval);

		/*
                 * Failed after setting to intermediate freq? Driver should have
                 * reverted back to initial frequency and so should we. Check
                 * here for intermediate_freq instead of get_intermediate, in
                 * case we haven't switched to intermediate freq at all.
                 */
		if (unlikely(retval && intermediate_freq)) {
			freqs.old = intermediate_freq;
			freqs.new = policy->restore_freq;
			cpufreq_freq_transition_begin(policy, &freqs);
			cpufreq_freq_transition_end(policy, &freqs, 0);
		}
	}

	return retval;
}

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shailendra verma
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0.41%
1
33.33%
Total
241
100.00%
3
100.00%



int __cpufreq_driver_target(struct cpufreq_policy *policy,
			    unsigned int target_freq,
			    unsigned int relation)
{
	unsigned int old_target_freq = target_freq;
	struct cpufreq_frequency_table *freq_table;
	int index, retval;

	if (cpufreq_disabled())
		return -ENODEV;

	/* Make sure that target_freq is within supported range */
	if (target_freq > policy->max)
		target_freq = policy->max;
	if (target_freq < policy->min)
		target_freq = policy->min;

	pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
		 policy->cpu, target_freq, relation, old_target_freq);

	/*
         * This might look like a redundant call as we are checking it again
         * after finding index. But it is left intentionally for cases where
         * exactly same freq is called again and so we can save on few function
         * calls.
         */
	if (target_freq == policy->cur)
		return 0;

	/* Save last value to restore later on errors */
	policy->restore_freq = policy->cur;

	if (cpufreq_driver->target)
		return cpufreq_driver->target(policy, target_freq, relation);

	if (!cpufreq_driver->target_index)
		return -EINVAL;

	freq_table = cpufreq_frequency_get_table(policy->cpu);
	if (unlikely(!freq_table)) {
		pr_err("%s: Unable to find freq_table\n", __func__);
		return -EINVAL;
	}

	retval = cpufreq_frequency_table_target(policy, freq_table, target_freq,
						relation, &index);
	if (unlikely(retval)) {
		pr_err("%s: Unable to find matching freq\n", __func__);
		return retval;
	}

	if (freq_table[index].frequency == policy->cur)
		return 0;

	return __target_index(policy, freq_table, index);
}
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dave jones
41
17.98%
3
21.43%
rafael j. wysocki
rafael j. wysocki
28
12.28%
2
14.29%
konrad rzeszutek wilk
konrad rzeszutek wilk
9
3.95%
1
7.14%
nathan zimmer
nathan zimmer
3
1.32%
1
7.14%
dominik brodowski
dominik brodowski
1
0.44%
1
7.14%
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228
100.00%
14
100.00%


EXPORT_SYMBOL_GPL(__cpufreq_driver_target);



int cpufreq_driver_target(struct cpufreq_policy *policy,
			  unsigned int target_freq,
			  unsigned int relation)
{
	int ret = -EINVAL;

	down_write(&policy->rwsem);

	ret = __cpufreq_driver_target(policy, target_freq, relation);

	up_write(&policy->rwsem);

	return ret;
}
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dave jones
dave jones
42
77.78%
4
50.00%
viresh kumar
viresh kumar
7
12.96%
2
25.00%
julia lawall
julia lawall
3
5.56%
1
12.50%
dominik brodowski
dominik brodowski
2
3.70%
1
12.50%
Total
54
100.00%
8
100.00%


EXPORT_SYMBOL_GPL(cpufreq_driver_target);



__weak struct cpufreq_governor *cpufreq_fallback_governor(void)
{
	return NULL;
}

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13
100.00%
1
100.00%



static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
{
	int ret;

	/* Don't start any governor operations if we are entering suspend */
	if (cpufreq_suspended)
		return 0;
	/*
         * Governor might not be initiated here if ACPI _PPC changed
         * notification happened, so check it.
         */
	if (!policy->governor)
		return -EINVAL;

	if (policy->governor->max_transition_latency &&
	    policy->cpuinfo.transition_latency >
	    policy->governor->max_transition_latency) {
		struct cpufreq_governor *gov = cpufreq_fallback_governor();

		if (gov) {
			pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n",
				policy->governor->name, gov->name);
			policy->governor = gov;
		} else {
			return -EINVAL;
		}
	}

	if (event == CPUFREQ_GOV_POLICY_INIT)
		if (!try_module_get(policy->governor->owner))
			return -EINVAL;

	pr_debug("%s: for CPU %u, event %u\n", __func__, policy->cpu, event);

	ret = policy->governor->governor(policy, event);

	if (event == CPUFREQ_GOV_POLICY_INIT) {
		if (ret)
			module_put(policy->governor->owner);
		else
			policy->governor->initialized++;
	} else if (event == CPUFREQ_GOV_POLICY_EXIT) {
		policy->governor->initialized--;
		module_put(policy->governor->owner);
	}

	return ret;
}

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dave jones
dave jones
57
27.54%
5
23.81%
thomas renninger
thomas renninger
47
22.71%
2
9.52%
viresh kumar
viresh kumar
46
22.22%
7
33.33%
rafael j. wysocki
rafael j. wysocki
32
15.46%
2
9.52%
ethan zhao
ethan zhao
12
5.80%
1
4.76%
dominik brodowski
dominik brodowski
11
5.31%
3
14.29%
joe perches
joe perches
2
0.97%
1
4.76%
Total
207
100.00%
21
100.00%



static int cpufreq_start_governor(struct cpufreq_policy *policy)
{
	int ret;

	if (cpufreq_driver->get && !cpufreq_driver->setpolicy)
		cpufreq_update_current_freq(policy);

	ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
	return ret ? ret : cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
}

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51
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2
100.00%



int cpufreq_register_governor(struct cpufreq_governor *governor)
{
	int err;

	if (!governor)
		return -EINVAL;

	if (cpufreq_disabled())
		return -ENODEV;

	mutex_lock(&cpufreq_governor_mutex);

	governor->initialized = 0;
	err = -EBUSY;
	if (!find_governor(governor->name)) {
		err = 0;
		list_add(&governor->governor_list, &cpufreq_governor_list);
	}

	mutex_unlock(&cpufreq_governor_mutex);
	return err;
}
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dave jones
dave jones
44
52.38%
4
36.36%
jeremy fitzhardinge
jeremy fitzhardinge
12
14.29%
1
9.09%
konrad rzeszutek wilk
konrad rzeszutek wilk
9
10.71%
1
9.09%
viresh kumar
viresh kumar
8
9.52%
2
18.18%
dominik brodowski
dominik brodowski
7
8.33%
2
18.18%
andrew morton
andrew morton
4
4.76%
1
9.09%
Total
84
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(cpufreq_register_governor);



void cpufreq_unregister_governor(struct cpufreq_governor *governor)
{
	struct cpufreq_policy *policy;
	unsigned long flags;

	if (!governor)
		return;

	if (cpufreq_disabled())
		return;

	/* clear last_governor for all inactive policies */
	read_lock_irqsave(&cpufreq_driver_lock, flags);
	for_each_inactive_policy(policy) {
		if (!strcmp(policy->last_governor, governor->name)) {
			policy->governor = NULL;
			strcpy(policy->last_governor, "\0");
		}
	}
	read_unlock_irqrestore(&cpufreq_driver_lock, flags);

	mutex_lock(&cpufreq_governor_mutex);
	list_del(&governor->governor_list);
	mutex_unlock(&cpufreq_governor_mutex);
	return;
}
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viresh kumar
40
37.74%
2
33.33%
dave jones
dave jones
33
31.13%
1
16.67%
prarit bhargava
prarit bhargava
23
21.70%
1
16.67%
konrad rzeszutek wilk
konrad rzeszutek wilk
6
5.66%
1
16.67%
andrew morton
andrew morton
4
3.77%
1
16.67%
Total
106
100.00%
6
100.00%


EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);


/*********************************************************************
 *                          POLICY INTERFACE                         *
 *********************************************************************/

/**
 * cpufreq_get_policy - get the current cpufreq_policy
 * @policy: struct cpufreq_policy into which the current cpufreq_policy
 *      is written
 *
 * Reads the current cpufreq policy.
 */


int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
{
	struct cpufreq_policy *cpu_policy;
	if (!policy)
		return -EINVAL;

	cpu_policy = cpufreq_cpu_get(cpu);
	if (!cpu_policy)
		return -EINVAL;

	memcpy(policy, cpu_policy, sizeof(*policy));

	cpufreq_cpu_put(cpu_policy);
	return 0;
}
Contributors
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dave jones
dave jones
60
92.31%
3
60.00%
dominik brodowski
dominik brodowski
3
4.62%
1
20.00%
viresh kumar
viresh kumar
2
3.08%
1
20.00%
Total
65
100.00%
5
100.00%


EXPORT_SYMBOL(cpufreq_get_policy);

/*
 * policy : current policy.
 * new_policy: policy to be set.
 */


static int cpufreq_set_policy(struct cpufreq_policy *policy,
				struct cpufreq_policy *new_policy)
{
	struct cpufreq_governor *old_gov;
	int ret;

	pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
		 new_policy->cpu, new_policy->min, new_policy->max);

	memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));

	/*
        * This check works well when we store new min/max freq attributes,
        * because new_policy is a copy of policy with one field updated.
        */
	if (new_policy->min > new_policy->max)
		return -EINVAL;

	/* verify the cpu speed can be set within this limit */
	ret = cpufreq_driver->verify(new_policy);
	if (ret)
		return ret;

	/* adjust if necessary - all reasons */
	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
			CPUFREQ_ADJUST, new_policy);

	/*
         * verify the cpu speed can be set within this limit, which might be
         * different to the first one
         */
	ret = cpufreq_driver->verify(new_policy);
	if (ret)
		return ret;

	/* notification of the new policy */
	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
			CPUFREQ_NOTIFY, new_policy);

	policy->min = new_policy->min;
	policy->max = new_policy->max;

	pr_debug("new min and max freqs are %u - %u kHz\n",
		 policy->min, policy->max);

	if (cpufreq_driver->setpolicy) {
		policy->policy = new_policy->policy;
		pr_debug("setting range\n");
		return cpufreq_driver->setpolicy(new_policy);
	}

	if (new_policy->governor == policy->governor) {
		pr_debug("cpufreq: governor limits update\n");
		return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
	}

	pr_debug("governor switch\n");

	/* save old, working values */
	old_gov = policy->governor;
	/* end old governor */
	if (old_gov) {
		cpufreq_stop_governor(policy);
		cpufreq_exit_governor(policy);
	}

	/* start new governor */
	policy->governor = new_policy->governor;
	ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT);
	if (!ret) {
		ret = cpufreq_start_governor(policy);
		if (!ret) {
			pr_debug("cpufreq: governor change\n");
			return 0;
		}
		cpufreq_exit_governor(policy);
	}

	/* new governor failed, so re-start old one */
	pr_debug("starting governor %s failed\n", policy->governor->name);
	if (old_gov) {
		policy->governor = old_gov;
		if (cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT))
			policy->governor = NULL;
		else
			cpufreq_start_governor(policy);
	}

	return ret;
}

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dave jones
dave jones
169
49.13%
5
20.83%
viresh kumar
viresh kumar
88
25.58%
8
33.33%
rafael j. wysocki
rafael j. wysocki
62
18.02%
5
20.83%
dominik brodowski
dominik brodowski
12
3.49%
3
12.50%
mattia dongili
mattia dongili
10
2.91%
1
4.17%
alan stern
alan stern
2
0.58%
1
4.17%
pan xinhui
pan xinhui
1
0.29%
1
4.17%
Total
344
100.00%
24
100.00%

/**
 *      cpufreq_update_policy - re-evaluate an existing cpufreq policy
 *      @cpu: CPU which shall be re-evaluated
 *
 *      Useful for policy notifiers which have different necessities
 *      at different times.
 */


int cpufreq_update_policy(unsigned int cpu)
{
	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
	struct cpufreq_policy new_policy;
	int ret;

	if (!policy)
		return -ENODEV;

	down_write(&policy->rwsem);

	pr_debug("updating policy for CPU %u\n", cpu);
	memcpy(&new_policy, policy, sizeof(*policy));
	new_policy.min = policy->user_policy.min;
	new_policy.max = policy->user_policy.max;

	/*
         * BIOS might change freq behind our back
         * -> ask driver for current freq and notify governors about a change
         */
	if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
		if (cpufreq_suspended) {
			ret = -EAGAIN;
			goto unlock;
		}
		new_policy.cur = cpufreq_update_current_freq(policy);
		if (WARN_ON(!new_policy.cur)) {
			ret = -EIO;
			goto unlock;
		}
	}

	ret = cpufreq_set_policy(policy, &new_policy);

unlock:
	up_write(&policy->rwsem);

	cpufreq_cpu_put(policy);
	return ret;
}
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dave jones
dave jones
69
40.83%
2
9.52%
viresh kumar
viresh kumar
44
26.04%
6
28.57%
rafael j. wysocki
rafael j. wysocki
23
13.61%
4
19.05%
dominik brodowski
dominik brodowski
12
7.10%
3
14.29%
thomas renninger
thomas renninger
11
6.51%
2
9.52%
aaron plattner
aaron plattner
5
2.96%
1
4.76%
nathan zimmer
nathan zimmer
3
1.78%
1
4.76%
venkatesh pallipadi
venkatesh pallipadi
1
0.59%
1
4.76%
julia lawall
julia lawall
1
0.59%
1
4.76%
Total
169
100.00%
21
100.00%


EXPORT_SYMBOL(cpufreq_update_policy);



static int cpufreq_cpu_callback(struct notifier_block *nfb,
					unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;

	switch (action & ~CPU_TASKS_FROZEN) {
	case CPU_ONLINE:
	case CPU_DOWN_FAILED:
		cpufreq_online(cpu);
		break;

	case CPU_DOWN_PREPARE:
		cpufreq_offline(cpu);
		break;
	}
	return NOTIFY_OK;
}

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ashok raj
ashok raj
47
75.81%
1
12.50%
rafael j. wysocki
rafael j. wysocki
6
9.68%
3
37.50%
srivatsa s. bhat
srivatsa s. bhat
5
8.06%
2
25.00%
venkatesh pallipadi
venkatesh pallipadi
3
4.84%
1
12.50%
viresh kumar
viresh kumar
1
1.61%
1
12.50%
Total
62
100.00%
8
100.00%


static struct notifier_block __refdata cpufreq_cpu_notifier = {
	.notifier_call = cpufreq_cpu_callback,
};

/*********************************************************************
 *               BOOST                                               *
 *********************************************************************/


static int cpufreq_boost_set_sw(int state)
{
	struct cpufreq_frequency_table *freq_table;
	struct cpufreq_policy *policy;
	int ret = -EINVAL;

	for_each_active_policy(policy) {
		freq_table = cpufreq_frequency_get_table(policy->cpu);
		if (freq_table) {
			ret = cpufreq_frequency_table_cpuinfo(policy,
							freq_table);
			if (ret) {
				pr_err("%s: Policy frequency update failed\n",
				       __func__);
				break;
			}

			down_write(&policy->rwsem);
			policy->user_policy.max = policy->max;
			cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
			up_write(&policy->rwsem);
		}
	}

	return ret;
}

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lukasz majewski
lukasz majewski
87
82.86%
1
25.00%
viresh kumar
viresh kumar
18
17.14%
3
75.00%
Total
105
100.00%
4
100.00%



int cpufreq_boost_trigger_state(int state)
{
	unsigned long flags;
	int ret = 0;

	if (cpufreq_driver->boost_enabled == state)
		return 0;

	write_lock_irqsave(&cpufreq_driver_lock, flags);
	cpufreq_driver->boost_enabled = state;
	write_unlock_irqrestore(&cpufreq_driver_lock, flags);

	ret = cpufreq_driver->set_boost(state);
	if (ret) {
		write_lock_irqsave(&cpufreq_driver_lock, flags);
		cpufreq_driver->boost_enabled = !state;
		write_unlock_irqrestore(&cpufreq_driver_lock, flags);

		pr_err("%s: Cannot %s BOOST\n",
		       __func__, state ? "enable" : "disable");
	}

	return ret;
}

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lukasz majewski
lukasz majewski
104
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1
100.00%
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104
100.00%
1
100.00%



static bool cpufreq_boost_supported(void)
{
	return likely(cpufreq_driver) && cpufreq_driver->set_boost;
}

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lukasz majewski
lukasz majewski
13
72.22%
1
33.33%
rafael j. wysocki
rafael j. wysocki
5
27.78%
2
66.67%
Total
18
100.00%
3
100.00%



static int create_boost_sysfs_file(void)
{
	int ret;

	ret = sysfs_create_file(cpufreq_global_kobject, &boost.attr);
	if (ret)
		pr_err("%s: cannot register global BOOST sysfs file\n",
		       __func__);

	return ret;
}

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viresh kumar
viresh kumar
37
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2
100.00%
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37
100.00%
2
100.00%



static void remove_boost_sysfs_file(void)
{
	if (cpufreq_boost_supported())
		sysfs_remove_file(cpufreq_global_kobject, &boost.attr);
}

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viresh kumar
23
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2
100.00%
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23
100.00%
2
100.00%



int cpufreq_enable_boost_support(void)
{
	if (!cpufreq_driver)
		return -EINVAL;

	if (cpufreq_boost_supported())
		return 0;

	cpufreq_driver->set_boost = cpufreq_boost_set_sw;

	/* This will get removed on driver unregister */
	return create_boost_sysfs_file();
}
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viresh kumar
viresh kumar
33
94.29%
1
50.00%
rafael j. wysocki
rafael j. wysocki
2
5.71%
1
50.00%
Total
35
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support);



int cpufreq_boost_enabled(void)
{
	return cpufreq_driver->boost_enabled;
}
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lukasz majewski
lukasz majewski
12
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1
100.00%
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12
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);

/*********************************************************************
 *               REGISTER / UNREGISTER CPUFREQ DRIVER                *
 *********************************************************************/

/**
 * cpufreq_register_driver - register a CPU Frequency driver
 * @driver_data: A struct cpufreq_driver containing the values#
 * submitted by the CPU Frequency driver.
 *
 * Registers a CPU Frequency driver to this core code. This code
 * returns zero on success, -EEXIST when another driver got here first
 * (and isn't unregistered in the meantime).
 *
 */


int cpufreq_register_driver(struct cpufreq_driver *driver_data)
{
	unsigned long flags;
	int ret;

	if (cpufreq_disabled())
		return -ENODEV;

	if (!driver_data || !driver_data->verify || !driver_data->init ||
	    !(driver_data->setpolicy || driver_data->target_index ||
		    driver_data->target) ||
	     (driver_data->setpolicy && (driver_data->target_index ||
		    driver_data->target)) ||
	     (!!driver_data->get_intermediate != !!driver_data->target_intermediate))
		return -EINVAL;

	pr_debug("trying to register driver %s\n", driver_data->name);

	/* Protect against concurrent CPU online/offline. */
	get_online_cpus();

	write_lock_irqsave(&cpufreq_driver_lock, flags);
	if (cpufreq_driver) {
		write_unlock_irqrestore(&cpufreq_driver_lock, flags);
		ret = -EEXIST;
		goto out;
	}
	cpufreq_driver = driver_data;
	write_unlock_irqrestore(&cpufreq_driver_lock, flags);

	if (driver_data->setpolicy)
		driver_data->flags |= CPUFREQ_CONST_LOOPS;

	if (cpufreq_boost_supported()) {
		ret = create_boost_sysfs_file();
		if (ret)
			goto err_null_driver;
	}

	ret = subsys_interface_register(&cpufreq_interface);
	if (ret)
		goto err_boost_unreg;

	if (!(cpufreq_driver->flags & CPUFREQ_STICKY) &&
	    list_empty(&cpufreq_policy_list)) {
		/* if all ->init() calls failed, unregister */
		pr_debug("%s: No CPU initialized for driver %s\n", __func__,
			 driver_data->name);
		goto err_if_unreg;
	}

	register_hotcpu_notifier(&cpufreq_cpu_notifier);
	pr_debug("driver %s up and running\n", driver_data->name);
	goto out;

err_if_unreg:
	subsys_interface_unregister(&cpufreq_interface);
err_boost_unreg:
	remove_boost_sysfs_file();
err_null_driver:
	write_lock_irqsave(&cpufreq_driver_lock, flags);
	cpufreq_driver = NULL;
	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
out:
	put_online_cpus();
	return ret;
}
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dave jones
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6
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dominik brodowski
42
14.69%
4
14.81%
viresh kumar
viresh kumar
39
13.64%
5
18.52%
rafael j. wysocki
rafael j. wysocki
38
13.29%
4
14.81%
jiri slaby
jiri slaby
25
8.74%
1
3.70%
lukasz majewski
lukasz majewski
17
5.94%
1
3.70%
konrad rzeszutek wilk
konrad rzeszutek wilk
9
3.15%
1
3.70%
pankaj gupta
pankaj gupta
9
3.15%
1
3.70%
kay sievers
kay sievers
6
2.10%
1
3.70%
nathan zimmer
nathan zimmer
5
1.75%
1
3.70%
mike travis
mike travis
4
1.40%
1
3.70%
yinghai lu
yinghai lu
1
0.35%
1
3.70%
Total
286
100.00%
27
100.00%


EXPORT_SYMBOL_GPL(cpufreq_register_driver);

/**
 * cpufreq_unregister_driver - unregister the current CPUFreq driver
 *
 * Unregister the current CPUFreq driver. Only call this if you have
 * the right to do so, i.e. if you have succeeded in initialising before!
 * Returns zero if successful, and -EINVAL if the cpufreq_driver is
 * currently not initialised.
 */


int cpufreq_unregister_driver(struct cpufreq_driver *driver)
{
	unsigned long flags;

	if (!cpufreq_driver || (driver != cpufreq_driver))
		return -EINVAL;

	pr_debug("unregistering driver %s\n", driver->name);

	/* Protect against concurrent cpu hotplug */
	get_online_cpus();
	subsys_interface_unregister(&cpufreq_interface);
	remove_boost_sysfs_file();
	unregister_hotcpu_notifier(&cpufreq_cpu_notifier);

	write_lock_irqsave(&cpufreq_driver_lock, flags);

	cpufreq_driver = NULL;

	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
	put_online_cpus();

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
37
44.58%
4
25.00%
dave jones
dave jones
23
27.71%
3
18.75%
sebastian andrzej siewior
sebastian andrzej siewior
6
7.23%
1
6.25%
ashok raj
ashok raj
5
6.02%
1
6.25%
rafael j. wysocki
rafael j. wysocki
3
3.61%
1
6.25%
lukasz majewski
lukasz majewski
2
2.41%
1
6.25%
viresh kumar
viresh kumar
2
2.41%
2
12.50%
kay sievers
kay sievers
2
2.41%
1
6.25%
nathan zimmer
nathan zimmer
2
2.41%
1
6.25%
chandra seetharaman
chandra seetharaman
1
1.20%
1
6.25%
Total
83
100.00%
16
100.00%


EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);

/*
 * Stop cpufreq at shutdown to make sure it isn't holding any locks
 * or mutexes when secondary CPUs are halted.
 */

static struct syscore_ops cpufreq_syscore_ops = {
	.shutdown = cpufreq_suspend,
};


struct kobject *cpufreq_global_kobject;

EXPORT_SYMBOL(cpufreq_global_kobject);



static int __init cpufreq_core_init(void)
{
	if (cpufreq_disabled())
		return -ENODEV;

	cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj);
	BUG_ON(!cpufreq_global_kobject);

	register_syscore_ops(&cpufreq_syscore_ops);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
venkatesh pallipadi
venkatesh pallipadi
12
25.53%
1
20.00%
viresh kumar
viresh kumar
11
23.40%
1
20.00%
thomas renninger
thomas renninger
9
19.15%
1
20.00%
konrad rzeszutek wilk
konrad rzeszutek wilk
9
19.15%
1
20.00%
douglas anderson
douglas anderson
6
12.77%
1
20.00%
Total
47
100.00%
5
100.00%


core_initcall(cpufreq_core_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
viresh kumar
viresh kumar
3062
33.32%
104
34.67%
dave jones
dave jones
2341
25.48%
47
15.67%
rafael j. wysocki
rafael j. wysocki
1091
11.87%
35
11.67%
lukasz majewski
lukasz majewski
413
4.49%
2
0.67%
srivatsa s. bhat
srivatsa s. bhat
363
3.95%
10
3.33%
venkatesh pallipadi
venkatesh pallipadi
275
2.99%
3
1.00%
dominik brodowski
dominik brodowski
269
2.93%
10
3.33%
thomas renninger
thomas renninger
228
2.48%
11
3.67%
dirk brandewie
dirk brandewie
117
1.27%
4
1.33%
jeremy fitzhardinge
jeremy fitzhardinge
114
1.24%
2
0.67%
konrad rzeszutek wilk
konrad rzeszutek wilk
68
0.74%
1
0.33%
patrick mochel
patrick mochel
66
0.72%
3
1.00%
ashok raj
ashok raj
64
0.70%
1
0.33%
darrick j. wong
darrick j. wong
61
0.66%
1
0.33%
jesse barnes
jesse barnes
52
0.57%
1
0.33%
benjamin herrenschmidt
benjamin herrenschmidt
37
0.40%
1
0.33%
alan stern
alan stern
36
0.39%
2
0.67%
richard cochran
richard cochran
35
0.38%
1
0.33%
srinivas pandruvada
srinivas pandruvada
35
0.38%
2
0.67%
prarit bhargava
prarit bhargava
33
0.36%
2
0.67%
kay sievers
kay sievers
31
0.34%
1
0.33%
borislav petkov
borislav petkov
30
0.33%
2
0.67%
nathan zimmer
nathan zimmer
28
0.30%
2
0.67%
thomas petazzoni
thomas petazzoni
26
0.28%
1
0.33%
jiri slaby
jiri slaby
25
0.27%
1
0.33%
douglas anderson
douglas anderson
22
0.24%
1
0.33%
tomeu vizoso
tomeu vizoso
20
0.22%
1
0.33%
jason baron
jason baron
19
0.21%
1
0.33%
andrew morton
andrew morton
17
0.19%
2
0.67%
gautham r shenoy
gautham r shenoy
17
0.19%
1
0.33%
mike travis
mike travis
16
0.17%
1
0.33%
cesar eduardo barros
cesar eduardo barros
14
0.15%
1
0.33%
lan tianyu
lan tianyu
12
0.13%
2
0.67%
ethan zhao
ethan zhao
12
0.13%
1
0.33%
mattia dongili
mattia dongili
10
0.11%
1
0.33%
greg kroah-hartman
greg kroah-hartman
10
0.11%
1
0.33%
aaron plattner
aaron plattner
10
0.11%
2
0.67%
chikama masaki
chikama masaki
10
0.11%
1
0.33%
pankaj gupta
pankaj gupta
9
0.10%
1
0.33%
rusty russell
rusty russell
8
0.09%
1
0.33%
sebastian andrzej siewior
sebastian andrzej siewior
8
0.09%
1
0.33%
stratos karafotis
stratos karafotis
8
0.09%
1
0.33%
joe perches
joe perches
7
0.08%
1
0.33%
andres salomon
andres salomon
5
0.05%
1
0.33%
david howells
david howells
4
0.04%
1
0.33%
geert uytterhoeven
geert uytterhoeven
4
0.04%
1
0.33%
americo wang
americo wang
4
0.04%
1
0.33%
julia lawall
julia lawall
4
0.04%
1
0.33%
ahmed s. darwish
ahmed s. darwish
4
0.04%
1
0.33%
stephen boyd
stephen boyd
3
0.03%
1
0.33%
rasmus villemoes
rasmus villemoes
3
0.03%
1
0.33%
bartlomiej zolnierkiewicz
bartlomiej zolnierkiewicz
3
0.03%
1
0.33%
jacob shin
jacob shin
2
0.02%
1
0.33%
shailendra verma
shailendra verma
2
0.02%
1
0.33%
kees cook
kees cook
2
0.02%
1
0.33%
eric biggers
eric biggers
2
0.02%
2
0.67%
jonathan corbet
jonathan corbet
2
0.02%
1
0.33%
mathieu desnoyers
mathieu desnoyers
2
0.02%
1
0.33%
alex chiang
alex chiang
2
0.02%
1
0.33%
yinghai lu
yinghai lu
1
0.01%
1
0.33%
emese revfy
emese revfy
1
0.01%
1
0.33%
dmitriy monakhov
dmitriy monakhov
1
0.01%
1
0.33%
lucas de marchi
lucas de marchi
1
0.01%
1
0.33%
afzal mohammed
afzal mohammed
1
0.01%
1
0.33%
pan xinhui
pan xinhui
1
0.01%
1
0.33%
sam ravnborg
sam ravnborg
1
0.01%
1
0.33%
chandra seetharaman
chandra seetharaman
1
0.01%
1
0.33%
linus torvalds
linus torvalds
1
0.01%
1
0.33%
dhaval giani
dhaval giani
1
0.01%
1
0.33%
rashika kheria
rashika kheria
1
0.01%
1
0.33%
chris wright
chris wright
1
0.01%
1
0.33%
Total
9189
100.00%
300
100.00%
  
Directory: drivers/cpufreq

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