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Release 4.7 include/linux/cpufreq.h

Directory: include/linux
/*
 * 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 accomodating '\n' in prints */

#define CPUFREQ_NAME_PLEN		(CPUFREQ_NAME_LEN + 1)

struct cpufreq_governor;


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;

	
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
         *   freqnency switching with the help of cpufreq_enable_fast_switch().
         */
	
bool			fast_switch_possible;
	
bool			fast_switch_enabled;

	/* 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); int 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 /********************************************************************* * 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) 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); /* * 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) 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) #define CPUFREQ_START (2) #define CPUFREQ_CREATE_POLICY (3) #define CPUFREQ_REMOVE_POLICY (4) #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. * * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL) * the ondemand governor will not work. All times here are in us (microseconds). */ #define MIN_SAMPLING_RATE_RATIO (2) #define LATENCY_MULTIPLIER (1000) #define MIN_LATENCY_MULTIPLIER (20) #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) /* Governor Events */ #define CPUFREQ_GOV_START 1 #define CPUFREQ_GOV_STOP 2 #define CPUFREQ_GOV_LIMITS 3 #define CPUFREQ_GOV_POLICY_INIT 4 #define CPUFREQ_GOV_POLICY_EXIT 5 struct cpufreq_governor { char name[CPUFREQ_NAME_LEN]; int initialized; int (*governor) (struct cpufreq_policy *policy, unsigned int event); ssize_t (*show_setspeed) (struct cpufreq_policy *policy, char *buf); int (*store_setspeed) (struct cpufreq_policy *policy, unsigned int freq); unsigned int max_transition_latency; /* HW must be able to switch to next freq faster than this value in nano secs or we will fallback to performance governor */ 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); 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); /* 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); }; /********************************************************************* * 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_frequency_table_target(struct cpufreq_policy *policy, struct cpufreq_frequency_table *table, unsigned int target_freq, unsigned int relation, unsigned int *index); 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); #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 /* the following funtion is for cpufreq core use only */ struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned 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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