Release 4.14 include/linux/cpufreq.h

/*
 * linux/include/linux/cpufreq.h
 *
 * Copyright (C) 2001 Russell King
 *           (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _LINUX_CPUFREQ_H

#define _LINUX_CPUFREQ_H

#include <linux/clk.h>
#include <linux/cpumask.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>

/*********************************************************************
 *                        CPUFREQ INTERFACE                          *
 *********************************************************************/
/*
 * Frequency values here are CPU kHz
 *
 * Maximum transition latency is in nanoseconds - if it's unknown,
 * CPUFREQ_ETERNAL shall be used.
 */


#define CPUFREQ_ETERNAL			(-1)

#define CPUFREQ_NAME_LEN		16
/* Print length for names. Extra 1 space for accommodating '\n' in prints */

#define CPUFREQ_NAME_PLEN		(CPUFREQ_NAME_LEN + 1)

struct cpufreq_governor;


enum cpufreq_table_sorting {
	
CPUFREQ_TABLE_UNSORTED,
	
CPUFREQ_TABLE_SORTED_ASCENDING,
	
CPUFREQ_TABLE_SORTED_DESCENDING
};


struct cpufreq_freqs {
	
unsigned int cpu;	/* cpu nr */
	
unsigned int old;
	
unsigned int new;
	
u8 flags;		/* flags of cpufreq_driver, see below. */
};


struct cpufreq_cpuinfo {
	
unsigned int		max_freq;
	
unsigned int		min_freq;

	/* in 10^(-9) s = nanoseconds */
	
unsigned int		transition_latency;
};


struct cpufreq_user_policy {
	
unsigned int		min;    /* in kHz */
	
unsigned int		max;    /* in kHz */
};


struct cpufreq_policy {
	/* CPUs sharing clock, require sw coordination */
	
cpumask_var_t		cpus;	/* Online CPUs only */
	
cpumask_var_t		related_cpus; /* Online + Offline CPUs */
	
cpumask_var_t		real_cpus; /* Related and present */

	
unsigned int		shared_type; /* ACPI: ANY or ALL affected CPUs
                                                should set cpufreq */
	
unsigned int		cpu;    /* cpu managing this policy, must be online */

	
struct clk		*clk;
	
struct cpufreq_cpuinfo	cpuinfo;/* see above */

	
unsigned int		min;    /* in kHz */
	
unsigned int		max;    /* in kHz */
	
unsigned int		cur;    /* in kHz, only needed if cpufreq
                                         * governors are used */
	
unsigned int		restore_freq; /* = policy->cur before transition */
	
unsigned int		suspend_freq; /* freq to set during suspend */

	
unsigned int		policy; /* see above */
	
unsigned int		last_policy; /* policy before unplug */
	
struct cpufreq_governor	*governor; /* see below */
	
void			*governor_data;
	
char			last_governor[CPUFREQ_NAME_LEN]; /* last governor used */

	
struct work_struct	update; /* if update_policy() needs to be
                                         * called, but you're in IRQ context */

	
struct cpufreq_user_policy user_policy;
	
struct cpufreq_frequency_table	*freq_table;
	
enum cpufreq_table_sorting freq_table_sorted;

	
struct list_head        policy_list;
	
struct kobject		kobj;
	
struct completion	kobj_unregister;

	/*
         * The rules for this semaphore:
         * - Any routine that wants to read from the policy structure will
         *   do a down_read on this semaphore.
         * - Any routine that will write to the policy structure and/or may take away
         *   the policy altogether (eg. CPU hotplug), will hold this lock in write
         *   mode before doing so.
         */
	
struct rw_semaphore	rwsem;

	/*
         * Fast switch flags:
         * - fast_switch_possible should be set by the driver if it can
         *   guarantee that frequency can be changed on any CPU sharing the
         *   policy and that the change will affect all of the policy CPUs then.
         * - fast_switch_enabled is to be set by governors that support fast
         *   frequency switching with the help of cpufreq_enable_fast_switch().
         */
	
bool			fast_switch_possible;
	
bool			fast_switch_enabled;

	/*
         * Preferred average time interval between consecutive invocations of
         * the driver to set the frequency for this policy.  To be set by the
         * scaling driver (0, which is the default, means no preference).
         */
	
unsigned int		transition_delay_us;

	/*
         * Remote DVFS flag (Not added to the driver structure as we don't want
         * to access another structure from scheduler hotpath).
         *
         * Should be set if CPUs can do DVFS on behalf of other CPUs from
         * different cpufreq policies.
         */
	
bool			dvfs_possible_from_any_cpu;

	 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
	
unsigned int cached_target_freq;
	
int cached_resolved_idx;

	/* Synchronization for frequency transitions */
	
bool			transition_ongoing; /* Tracks transition status */
	
spinlock_t		transition_lock;
	
wait_queue_head_t	transition_wait;
	
struct task_struct	*transition_task; /* Task which is doing the transition */

	/* cpufreq-stats */
	
struct cpufreq_stats	*stats;

	/* For cpufreq driver's internal use */
	
void			*driver_data;
};

/* Only for ACPI */

#define CPUFREQ_SHARED_TYPE_NONE (0) 
/* None */

#define CPUFREQ_SHARED_TYPE_HW	 (1) 
/* HW does needed coordination */

#define CPUFREQ_SHARED_TYPE_ALL	 (2) 
/* All dependent CPUs should set freq */

#define CPUFREQ_SHARED_TYPE_ANY	 (3) 
/* Freq can be set from any dependent CPU*/

#ifdef CONFIG_CPU_FREQ
struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
void cpufreq_cpu_put(struct cpufreq_policy *policy);
#else


static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
{
	return NULL;
}
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static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
{
	return NULL;
}
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static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
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#endif



static inline bool policy_is_shared(struct cpufreq_policy *policy)
{
	return cpumask_weight(policy->cpus) > 1;
}

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/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
extern struct kobject *cpufreq_global_kobject;

#ifdef CONFIG_CPU_FREQ
unsigned int cpufreq_get(unsigned int cpu);
unsigned int cpufreq_quick_get(unsigned int cpu);
unsigned int cpufreq_quick_get_max(unsigned int cpu);
void disable_cpufreq(void);

u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
void cpufreq_update_policy(unsigned int cpu);
bool have_governor_per_policy(void);
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
#else


static inline unsigned int cpufreq_get(unsigned int cpu)
{
	return 0;
}
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static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
	return 0;
}
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static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
{
	return 0;
}
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static inline void disable_cpufreq(void) { }
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#endif

#ifdef CONFIG_CPU_FREQ_STAT
void cpufreq_stats_create_table(struct cpufreq_policy *policy);
void cpufreq_stats_free_table(struct cpufreq_policy *policy);
void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
				     unsigned int new_freq);
#else


static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
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static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
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static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
						   unsigned int new_freq) { }
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#endif /* CONFIG_CPU_FREQ_STAT */

/*********************************************************************
 *                      CPUFREQ DRIVER INTERFACE                     *
 *********************************************************************/


#define CPUFREQ_RELATION_L 0  
/* lowest frequency at or above target */

#define CPUFREQ_RELATION_H 1  
/* highest frequency below or at target */

#define CPUFREQ_RELATION_C 2  
/* closest frequency to target */


struct freq_attr {
	
struct attribute attr;
	
ssize_t (*show)(struct cpufreq_policy *, char *);
	
ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
};


#define cpufreq_freq_attr_ro(_name)		\
static struct freq_attr _name =                 \
__ATTR(_name, 0444, show_##_name, NULL)


#define cpufreq_freq_attr_ro_perm(_name, _perm)	\
static struct freq_attr _name =                 \
__ATTR(_name, _perm, show_##_name, NULL)


#define cpufreq_freq_attr_rw(_name)		\
static struct freq_attr _name =                 \
__ATTR(_name, 0644, show_##_name, store_##_name)


#define cpufreq_freq_attr_wo(_name)		\
static struct freq_attr _name =                 \
__ATTR(_name, 0200, NULL, store_##_name)


struct global_attr {
	
struct attribute attr;
	
ssize_t (*show)(struct kobject *kobj,
			struct attribute *attr, char *buf);
	
ssize_t (*store)(struct kobject *a, struct attribute *b,
			 const char *c, size_t count);
};


#define define_one_global_ro(_name)		\
static struct global_attr _name =               \
__ATTR(_name, 0444, show_##_name, NULL)


#define define_one_global_rw(_name)		\
static struct global_attr _name =               \
__ATTR(_name, 0644, show_##_name, store_##_name)



struct cpufreq_driver {
	
char		name[CPUFREQ_NAME_LEN];
	
u8		flags;
	
void		*driver_data;

	/* needed by all drivers */
	
int		(*init)(struct cpufreq_policy *policy);
	
int		(*verify)(struct cpufreq_policy *policy);

	/* define one out of two */
	
int		(*setpolicy)(struct cpufreq_policy *policy);

	/*
         * On failure, should always restore frequency to policy->restore_freq
         * (i.e. old freq).
         */
	
int		(*target)(struct cpufreq_policy *policy,
				  unsigned int target_freq,
				  unsigned int relation);	/* Deprecated */
	
int		(*target_index)(struct cpufreq_policy *policy,
					unsigned int index);
	
unsigned int	(*fast_switch)(struct cpufreq_policy *policy,
				       unsigned int target_freq);

	/*
         * Caches and returns the lowest driver-supported frequency greater than
         * or equal to the target frequency, subject to any driver limitations.
         * Does not set the frequency. Only to be implemented for drivers with
         * target().
         */
	
unsigned int	(*resolve_freq)(struct cpufreq_policy *policy,
					unsigned int target_freq);

	/*
         * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
         * unset.
         *
         * get_intermediate should return a stable intermediate frequency
         * platform wants to switch to and target_intermediate() should set CPU
         * to to that frequency, before jumping to the frequency corresponding
         * to 'index'. Core will take care of sending notifications and driver
         * doesn't have to handle them in target_intermediate() or
         * target_index().
         *
         * Drivers can return '0' from get_intermediate() in case they don't
         * wish to switch to intermediate frequency for some target frequency.
         * In that case core will directly call ->target_index().
         */
	
unsigned int	(*get_intermediate)(struct cpufreq_policy *policy,
					    unsigned int index);
	
int		(*target_intermediate)(struct cpufreq_policy *policy,
					       unsigned int index);

	/* should be defined, if possible */
	
unsigned int	(*get)(unsigned int cpu);

	/* optional */
	
int		(*bios_limit)(int cpu, unsigned int *limit);

	
int		(*exit)(struct cpufreq_policy *policy);
	
void		(*stop_cpu)(struct cpufreq_policy *policy);
	
int		(*suspend)(struct cpufreq_policy *policy);
	
int		(*resume)(struct cpufreq_policy *policy);

	/* Will be called after the driver is fully initialized */
	
void		(*ready)(struct cpufreq_policy *policy);

	
struct freq_attr **attr;

	/* platform specific boost support code */
	
bool		boost_enabled;
	
int		(*set_boost)(int state);
};

/* flags */

#define CPUFREQ_STICKY		(1 << 0)	
/* driver isn't removed even if
                                                   all ->init() calls failed */

#define CPUFREQ_CONST_LOOPS	(1 << 1)	
/* loops_per_jiffy or other
                                                   kernel "constants" aren't
                                                   affected by frequency
                                                   transitions */

#define CPUFREQ_PM_NO_WARN	(1 << 2)	
/* don't warn on suspend/resume
                                                   speed mismatches */

/*
 * This should be set by platforms having multiple clock-domains, i.e.
 * supporting multiple policies. With this sysfs directories of governor would
 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 * governor with different tunables for different clusters.
 */

#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)

/*
 * Driver will do POSTCHANGE notifications from outside of their ->target()
 * routine and so must set cpufreq_driver->flags with this flag, so that core
 * can handle them specially.
 */

#define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)

/*
 * Set by drivers which want cpufreq core to check if CPU is running at a
 * frequency present in freq-table exposed by the driver. For these drivers if
 * CPU is found running at an out of table freq, we will try to set it to a freq
 * from the table. And if that fails, we will stop further boot process by
 * issuing a BUG_ON().
 */

#define CPUFREQ_NEED_INITIAL_FREQ_CHECK	(1 << 5)

/*
 * Set by drivers to disallow use of governors with "dynamic_switching" flag
 * set.
 */

#define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING (1 << 6)

int cpufreq_register_driver(struct cpufreq_driver *driver_data);
int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);

const char *cpufreq_get_current_driver(void);
void *cpufreq_get_driver_data(void);



static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
		unsigned int min, unsigned int max)
{
	if (policy->min < min)
		policy->min = min;
	if (policy->max < min)
		policy->max = min;
	if (policy->min > max)
		policy->min = max;
	if (policy->max > max)
		policy->max = max;
	if (policy->min > policy->max)
		policy->min = policy->max;
	return;
}

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static inline void

cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
{
	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
			policy->cpuinfo.max_freq);
}

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#ifdef CONFIG_CPU_FREQ
void cpufreq_suspend(void);
void cpufreq_resume(void);
int cpufreq_generic_suspend(struct cpufreq_policy *policy);
#else


static inline void cpufreq_suspend(void) {}
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static inline void cpufreq_resume(void) {}
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#endif

/*********************************************************************
 *                     CPUFREQ NOTIFIER INTERFACE                    *
 *********************************************************************/


#define CPUFREQ_TRANSITION_NOTIFIER	(0)

#define CPUFREQ_POLICY_NOTIFIER		(1)

/* Transition notifiers */

#define CPUFREQ_PRECHANGE		(0)

#define CPUFREQ_POSTCHANGE		(1)

/* Policy Notifiers  */

#define CPUFREQ_ADJUST			(0)

#define CPUFREQ_NOTIFY			(1)

#ifdef CONFIG_CPU_FREQ
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);

void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs);
void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs, int transition_failed);

#else /* CONFIG_CPU_FREQ */


static inline int cpufreq_register_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
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static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
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#endif /* !CONFIG_CPU_FREQ */

/**
 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 * safe)
 * @old:   old value
 * @div:   divisor
 * @mult:  multiplier
 *
 *
 * new = old * mult / div
 */


static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
		u_int mult)
{
#if BITS_PER_LONG == 32
	u64 result = ((u64) old) * ((u64) mult);
	do_div(result, div);
	return (unsigned long) result;

#elif BITS_PER_LONG == 64
	unsigned long result = old * ((u64) mult);
	result /= div;
	return result;
#endif
}

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/*********************************************************************
 *                          CPUFREQ GOVERNORS                        *
 *********************************************************************/

/*
 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 * two generic policies are available:
 */

#define CPUFREQ_POLICY_POWERSAVE	(1)

#define CPUFREQ_POLICY_PERFORMANCE	(2)

/*
 * The polling frequency depends on the capability of the processor. Default
 * polling frequency is 1000 times the transition latency of the processor. The
 * ondemand governor will work on any processor with transition latency <= 10ms,
 * using appropriate sampling rate.
 */

#define LATENCY_MULTIPLIER		(1000)


struct cpufreq_governor {
	
char	name[CPUFREQ_NAME_LEN];
	
int	(*init)(struct cpufreq_policy *policy);
	
void	(*exit)(struct cpufreq_policy *policy);
	
int	(*start)(struct cpufreq_policy *policy);
	
void	(*stop)(struct cpufreq_policy *policy);
	
void	(*limits)(struct cpufreq_policy *policy);
	
ssize_t	(*show_setspeed)	(struct cpufreq_policy *policy,
					 char *buf);
	
int	(*store_setspeed)	(struct cpufreq_policy *policy,
					 unsigned int freq);
	/* For governors which change frequency dynamically by themselves */
	
bool			dynamic_switching;
	
struct list_head	governor_list;
	
struct module		*owner;
};

/* Pass a target to the cpufreq driver */
unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
					unsigned int target_freq);
int cpufreq_driver_target(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);
int __cpufreq_driver_target(struct cpufreq_policy *policy,
				   unsigned int target_freq,
				   unsigned int relation);
unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
					 unsigned int target_freq);
unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
int cpufreq_register_governor(struct cpufreq_governor *governor);
void cpufreq_unregister_governor(struct cpufreq_governor *governor);

struct cpufreq_governor *cpufreq_default_governor(void);
struct cpufreq_governor *cpufreq_fallback_governor(void);



static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
{
	if (policy->max < policy->cur)
		__cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
	else if (policy->min > policy->cur)
		__cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
}

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/* Governor attribute set */

struct gov_attr_set {
	
struct kobject kobj;
	
struct list_head policy_list;
	
struct mutex update_lock;
	
int usage_count;
};

/* sysfs ops for cpufreq governors */
extern const struct sysfs_ops governor_sysfs_ops;

void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);

/* Governor sysfs attribute */

struct governor_attr {
	
struct attribute attr;
	
ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
	
ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
			 size_t count);
};



static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy)
{
	/*
         * Allow remote callbacks if:
         * - dvfs_possible_from_any_cpu flag is set
         * - the local and remote CPUs share cpufreq policy
         */
	return policy->dvfs_possible_from_any_cpu ||
		cpumask_test_cpu(smp_processor_id(), policy->cpus);
}

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/*********************************************************************
 *                     FREQUENCY TABLE HELPERS                       *
 *********************************************************************/

/* Special Values of .frequency field */

#define CPUFREQ_ENTRY_INVALID	~0u

#define CPUFREQ_TABLE_END	~1u
/* Special Values of .flags field */

#define CPUFREQ_BOOST_FREQ	(1 << 0)


struct cpufreq_frequency_table {
	
unsigned int	flags;
	
unsigned int	driver_data; /* driver specific data, not used by core */
	
unsigned int	frequency; /* kHz - doesn't need to be in ascending
                                    * order */
};

#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
int dev_pm_opp_init_cpufreq_table(struct device *dev,
				  struct cpufreq_frequency_table **table);
void dev_pm_opp_free_cpufreq_table(struct device *dev,
				   struct cpufreq_frequency_table **table);
#else


static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
						struct cpufreq_frequency_table
						**table)
{
	return -EINVAL;
}

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static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
						 struct cpufreq_frequency_table
						 **table)
{
}
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#endif

/*
 * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 * @table:      the cpufreq_frequency_table * to iterate over.
 */


#define cpufreq_for_each_entry(pos, table)	\
	for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)

/*
 * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 * @table:      the cpufreq_frequency_table * to iterate over.
 */


#define cpufreq_for_each_valid_entry(pos, table)			\
	for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
                if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
                        continue;                                       \
                else

int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
				    struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
				   struct cpufreq_frequency_table *table);
int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);

int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);
int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
		unsigned int freq);

ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);

#ifdef CONFIG_CPU_FREQ
int cpufreq_boost_trigger_state(int state);
int cpufreq_boost_enabled(void);
int cpufreq_enable_boost_support(void);
bool policy_has_boost_freq(struct cpufreq_policy *policy);

/* Find lowest freq at or above target in a table in ascending order */


static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq >= target_freq)
			return pos - table;

		best = pos;
	}

	return best - table;
}

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/* Find lowest freq at or above target in a table in descending order */


static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq > target_freq) {
			best = pos;
			continue;
		}

		/* No freq found above target_freq */
		if (best == table - 1)
			return pos - table;

		return best - table;
	}

	return best - table;
}

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/* Works only on sorted freq-tables */


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

	if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
		return cpufreq_table_find_index_al(policy, target_freq);
	else
		return cpufreq_table_find_index_dl(policy, target_freq);
}

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/* Find highest freq at or below target in a table in ascending order */


static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq < target_freq) {
			best = pos;
			continue;
		}

		/* No freq found below target_freq */
		if (best == table - 1)
			return pos - table;

		return best - table;
	}

	return best - table;
}

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/* Find highest freq at or below target in a table in descending order */


static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq <= target_freq)
			return pos - table;

		best = pos;
	}

	return best - table;
}

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/* Works only on sorted freq-tables */


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

	if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
		return cpufreq_table_find_index_ah(policy, target_freq);
	else
		return cpufreq_table_find_index_dh(policy, target_freq);
}

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/* Find closest freq to target in a table in ascending order */


static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq < target_freq) {
			best = pos;
			continue;
		}

		/* No freq found below target_freq */
		if (best == table - 1)
			return pos - table;

		/* Choose the closest freq */
		if (target_freq - best->frequency > freq - target_freq)
			return pos - table;

		return best - table;
	}

	return best - table;
}

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/* Find closest freq to target in a table in descending order */


static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq > target_freq) {
			best = pos;
			continue;
		}

		/* No freq found above target_freq */
		if (best == table - 1)
			return pos - table;

		/* Choose the closest freq */
		if (best->frequency - target_freq > target_freq - freq)
			return pos - table;

		return best - table;
	}

	return best - table;
}

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/* Works only on sorted freq-tables */


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

	if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
		return cpufreq_table_find_index_ac(policy, target_freq);
	else
		return cpufreq_table_find_index_dc(policy, target_freq);
}

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static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
						 unsigned int target_freq,
						 unsigned int relation)
{
	if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
		return cpufreq_table_index_unsorted(policy, target_freq,
						    relation);

	switch (relation) {
	case CPUFREQ_RELATION_L:
		return cpufreq_table_find_index_l(policy, target_freq);
	case CPUFREQ_RELATION_H:
		return cpufreq_table_find_index_h(policy, target_freq);
	case CPUFREQ_RELATION_C:
		return cpufreq_table_find_index_c(policy, target_freq);
	default:
		pr_err("%s: Invalid relation: %d\n", __func__, relation);
		return -EINVAL;
	}
}

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static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
{
	struct cpufreq_frequency_table *pos;
	int count = 0;

	if (unlikely(!policy->freq_table))
		return 0;

	cpufreq_for_each_valid_entry(pos, policy->freq_table)
		count++;

	return count;
}
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#else


static inline int cpufreq_boost_trigger_state(int state)
{
	return 0;
}
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static inline int cpufreq_boost_enabled(void)
{
	return 0;
}

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static inline int cpufreq_enable_boost_support(void)
{
	return -EINVAL;
}

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static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
{
	return false;
}
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#endif

extern unsigned int arch_freq_get_on_cpu(int cpu);

/* the following are really really optional */
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
extern struct freq_attr *cpufreq_generic_attr[];
int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
				      struct cpufreq_frequency_table *table);

unsigned int cpufreq_generic_get(unsigned int cpu);
int cpufreq_generic_init(struct cpufreq_policy *policy,
		struct cpufreq_frequency_table *table,
		unsigned int transition_latency);
#endif /* _LINUX_CPUFREQ_H */
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Directory: include/linux

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