xref: /linux-6.15/include/linux/cpufreq.h (revision b7902803)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * linux/include/linux/cpufreq.h
 *
 * Copyright (C) 2001 Russell King
 *           (C) 2002 - 2003 Dominik Brodowski <[email protected]>
 */
#ifndef _LINUX_CPUFREQ_H
#define _LINUX_CPUFREQ_H

#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
#include <linux/pm_qos.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
#include <linux/minmax.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_cpuinfo {
	unsigned int		max_freq;
	unsigned int		min_freq;

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

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		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 freq_constraints	constraints;
	struct freq_qos_request	*min_freq_req;
	struct freq_qos_request	*max_freq_req;

	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;

	/*
	 * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current
	 * governor.
	 */
	bool			strict_target;

	/*
	 * Set if inefficient frequencies were found in the frequency table.
	 * This indicates if the relation flag CPUFREQ_RELATION_E can be
	 * honored.
	 */
	bool			efficiencies_available;

	/*
	 * 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;

	/* Per policy boost enabled flag. */
	bool			boost_enabled;

	/* Per policy boost supported flag. */
	bool			boost_supported;

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

	/* Pointer to the cooling device if used for thermal mitigation */
	struct thermal_cooling_device *cdev;

	struct notifier_block nb_min;
	struct notifier_block nb_max;
};

/*
 * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 * callback for sanitization.  That callback is only expected to modify the min
 * and max values, if necessary, and specifically it must not update the
 * frequency table.
 */
struct cpufreq_policy_data {
	struct cpufreq_cpuinfo		cpuinfo;
	struct cpufreq_frequency_table	*freq_table;
	unsigned int			cpu;
	unsigned int			min;    /* in kHz */
	unsigned int			max;    /* in kHz */
};

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

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

/* Scope based cleanup macro for cpufreq_policy kobject reference counting */
DEFINE_FREE(put_cpufreq_policy, struct cpufreq_policy *, if (_T) cpufreq_cpu_put(_T))

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

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

#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);
unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
void disable_cpufreq(void);

u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);

struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
void cpufreq_cpu_release(struct cpufreq_policy *policy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
void refresh_frequency_limits(struct cpufreq_policy *policy);
void cpufreq_update_policy(unsigned int cpu);
void cpufreq_update_limits(unsigned int cpu);
bool have_governor_per_policy(void);
bool cpufreq_supports_freq_invariance(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);
bool has_target_index(void);

DECLARE_PER_CPU(unsigned long, cpufreq_pressure);
static inline unsigned long cpufreq_get_pressure(int cpu)
{
	return READ_ONCE(per_cpu(cpufreq_pressure, cpu));
}
#else
static inline unsigned int cpufreq_get(unsigned int cpu)
{
	return 0;
}
static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
	return 0;
}
static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
{
	return 0;
}
static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
{
	return 0;
}
static inline bool cpufreq_supports_freq_invariance(void)
{
	return false;
}
static inline void disable_cpufreq(void) { }
static inline void cpufreq_update_limits(unsigned int cpu) { }
static inline unsigned long cpufreq_get_pressure(int cpu)
{
	return 0;
}
#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) { }
static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
						   unsigned int new_freq) { }
#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 */
/* relation flags */
#define CPUFREQ_RELATION_E BIT(2) /* Get if possible an efficient frequency */

#define CPUFREQ_RELATION_LE (CPUFREQ_RELATION_L | CPUFREQ_RELATION_E)
#define CPUFREQ_RELATION_HE (CPUFREQ_RELATION_H | CPUFREQ_RELATION_E)
#define CPUFREQ_RELATION_CE (CPUFREQ_RELATION_C | CPUFREQ_RELATION_E)

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)

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

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


struct cpufreq_driver {
	char		name[CPUFREQ_NAME_LEN];
	u16		flags;
	void		*driver_data;

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

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

	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);
	/*
	 * ->fast_switch() replacement for drivers that use an internal
	 * representation of performance levels and can pass hints other than
	 * the target performance level to the hardware. This can only be set
	 * if ->fast_switch is set too, because in those cases (under specific
	 * conditions) scale invariance can be disabled, which causes the
	 * schedutil governor to fall back to the latter.
	 */
	void		(*adjust_perf)(unsigned int cpu,
				       unsigned long min_perf,
				       unsigned long target_perf,
				       unsigned long capacity);

	/*
	 * 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 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, return 0 on error */
	unsigned int	(*get)(unsigned int cpu);

	/* Called to update policy limits on firmware notifications. */
	void		(*update_limits)(unsigned int cpu);

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

	int		(*online)(struct cpufreq_policy *policy);
	int		(*offline)(struct cpufreq_policy *policy);
	void		(*exit)(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)(struct cpufreq_policy *policy, int state);

	/*
	 * Set by drivers that want to register with the energy model after the
	 * policy is properly initialized, but before the governor is started.
	 */
	void		(*register_em)(struct cpufreq_policy *policy);
};

/* flags */

/*
 * Set by drivers that need to update internal upper and lower boundaries along
 * with the target frequency and so the core and governors should also invoke
 * the diver if the target frequency does not change, but the policy min or max
 * may have changed.
 */
#define CPUFREQ_NEED_UPDATE_LIMITS		BIT(0)

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

/*
 * Set by drivers that want the core to automatically register the cpufreq
 * driver as a thermal cooling device.
 */
#define CPUFREQ_IS_COOLING_DEV			BIT(2)

/*
 * 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	BIT(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		BIT(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	BIT(5)

/*
 * Set by drivers to disallow use of governors with "dynamic_switching" flag
 * set.
 */
#define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING	BIT(6)

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

bool cpufreq_driver_test_flags(u16 flags);
const char *cpufreq_get_current_driver(void);
void *cpufreq_get_driver_data(void);

static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
{
	return IS_ENABLED(CONFIG_CPU_THERMAL) &&
		(drv->flags & CPUFREQ_IS_COOLING_DEV);
}

static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
						unsigned int min,
						unsigned int max)
{
	policy->max = clamp(policy->max, min, max);
	policy->min = clamp(policy->min, min, policy->max);
}

static inline void
cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
{
	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
				     policy->cpuinfo.max_freq);
}

#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) {}
static inline void cpufreq_resume(void) {}
#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_CREATE_POLICY		(0)
#define CPUFREQ_REMOVE_POLICY		(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;
}
static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
#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
}

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

#define CPUFREQ_POLICY_UNKNOWN		(0)
/*
 * 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)

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);
	struct list_head	governor_list;
	struct module		*owner;
	u8			flags;
};

/* Governor flags */

/* For governors which change frequency dynamically by themselves */
#define CPUFREQ_GOV_DYNAMIC_SWITCHING	BIT(0)

/* For governors wanting the target frequency to be set exactly */
#define CPUFREQ_GOV_STRICT_TARGET	BIT(1)


/* Pass a target to the cpufreq driver */
unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
					unsigned int target_freq);
void cpufreq_driver_adjust_perf(unsigned int cpu,
				unsigned long min_perf,
				unsigned long target_perf,
				unsigned long capacity);
bool cpufreq_driver_has_adjust_perf(void);
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);
int cpufreq_start_governor(struct cpufreq_policy *policy);
void cpufreq_stop_governor(struct cpufreq_policy *policy);

#define cpufreq_governor_init(__governor)			\
static int __init __governor##_init(void)			\
{								\
	return cpufreq_register_governor(&__governor);	\
}								\
core_initcall(__governor##_init)

#define cpufreq_governor_exit(__governor)			\
static void __exit __governor##_exit(void)			\
{								\
	return cpufreq_unregister_governor(&__governor);	\
}								\
module_exit(__governor##_exit)

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_HE);
	else if (policy->min > policy->cur)
		__cpufreq_driver_target(policy, policy->min,
					CPUFREQ_RELATION_LE);
}

/* 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;

static inline struct gov_attr_set *to_gov_attr_set(struct kobject *kobj)
{
	return container_of(kobj, struct gov_attr_set, kobj);
}

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)
#define CPUFREQ_INEFFICIENT_FREQ	(1 << 1)

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 */
};

/*
 * 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_entry_idx -	iterate over a cpufreq_frequency_table
 *	with index
 * @pos:	the cpufreq_frequency_table * to use as a loop cursor.
 * @table:	the cpufreq_frequency_table * to iterate over.
 * @idx:	the table entry currently being processed
 */

#define cpufreq_for_each_entry_idx(pos, table, idx)	\
	for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
		pos++, idx++)

/*
 * 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

/*
 * cpufreq_for_each_valid_entry_idx -     iterate with index 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.
 * @idx:	the table entry currently being processed
 */

#define cpufreq_for_each_valid_entry_idx(pos, table, idx)		\
	cpufreq_for_each_entry_idx(pos, table, idx)			\
		if (pos->frequency == CPUFREQ_ENTRY_INVALID)		\
			continue;					\
		else

/**
 * cpufreq_for_each_efficient_entry_idx - iterate with index over a cpufreq
 *	frequency_table excluding CPUFREQ_ENTRY_INVALID and
 *	CPUFREQ_INEFFICIENT_FREQ frequencies.
 * @pos: the &struct cpufreq_frequency_table to use as a loop cursor.
 * @table: the &struct cpufreq_frequency_table to iterate over.
 * @idx: the table entry currently being processed.
 * @efficiencies: set to true to only iterate over efficient frequencies.
 */

#define cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies)	\
	cpufreq_for_each_valid_entry_idx(pos, table, idx)			\
		if (efficiencies && (pos->flags & CPUFREQ_INEFFICIENT_FREQ))	\
			continue;						\
		else


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

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

int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
				 unsigned int target_freq, unsigned int min,
				 unsigned int max, 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
bool cpufreq_boost_enabled(void);
int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state);

/* 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,
					      bool efficiencies)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos;
	unsigned int freq;
	int idx, best = -1;

	cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
		freq = pos->frequency;

		if (freq >= target_freq)
			return idx;

		best = idx;
	}

	return best;
}

/* 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,
					      bool efficiencies)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos;
	unsigned int freq;
	int idx, best = -1;

	cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
		freq = pos->frequency;

		if (freq == target_freq)
			return idx;

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

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

		return best;
	}

	return best;
}

static inline int find_index_l(struct cpufreq_policy *policy,
			       unsigned int target_freq,
			       unsigned int min, unsigned int max,
			       bool efficiencies)
{
	target_freq = clamp_val(target_freq, min, max);

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

/* Works only on sorted freq-tables */
static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
					     unsigned int target_freq,
					     bool efficiencies)
{
	return find_index_l(policy, target_freq, policy->min, policy->max, efficiencies);
}

/* 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,
					      bool efficiencies)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos;
	unsigned int freq;
	int idx, best = -1;

	cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
		freq = pos->frequency;

		if (freq == target_freq)
			return idx;

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

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

		return best;
	}

	return best;
}

/* 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,
					      bool efficiencies)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos;
	unsigned int freq;
	int idx, best = -1;

	cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
		freq = pos->frequency;

		if (freq <= target_freq)
			return idx;

		best = idx;
	}

	return best;
}

static inline int find_index_h(struct cpufreq_policy *policy,
			       unsigned int target_freq,
			       unsigned int min, unsigned int max,
			       bool efficiencies)
{
	target_freq = clamp_val(target_freq, min, max);

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

/* Works only on sorted freq-tables */
static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
					     unsigned int target_freq,
					     bool efficiencies)
{
	return find_index_h(policy, target_freq, policy->min, policy->max, efficiencies);
}

/* 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,
					      bool efficiencies)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos;
	unsigned int freq;
	int idx, best = -1;

	cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
		freq = pos->frequency;

		if (freq == target_freq)
			return idx;

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

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

		/* Choose the closest freq */
		if (target_freq - table[best].frequency > freq - target_freq)
			return idx;

		return best;
	}

	return best;
}

/* 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,
					      bool efficiencies)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos;
	unsigned int freq;
	int idx, best = -1;

	cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
		freq = pos->frequency;

		if (freq == target_freq)
			return idx;

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

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

		/* Choose the closest freq */
		if (table[best].frequency - target_freq > target_freq - freq)
			return idx;

		return best;
	}

	return best;
}

static inline int find_index_c(struct cpufreq_policy *policy,
			       unsigned int target_freq,
			       unsigned int min, unsigned int max,
			       bool efficiencies)
{
	target_freq = clamp_val(target_freq, min, max);

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

/* Works only on sorted freq-tables */
static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
					     unsigned int target_freq,
					     bool efficiencies)
{
	return find_index_c(policy, target_freq, policy->min, policy->max, efficiencies);
}

static inline bool cpufreq_is_in_limits(struct cpufreq_policy *policy,
					unsigned int min, unsigned int max,
					int idx)
{
	unsigned int freq;

	if (idx < 0)
		return false;

	freq = policy->freq_table[idx].frequency;

	return freq == clamp_val(freq, min, max);
}

static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
						 unsigned int target_freq,
						 unsigned int min,
						 unsigned int max,
						 unsigned int relation)
{
	bool efficiencies = policy->efficiencies_available &&
			    (relation & CPUFREQ_RELATION_E);
	int idx;

	/* cpufreq_table_index_unsorted() has no use for this flag anyway */
	relation &= ~CPUFREQ_RELATION_E;

	if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
		return cpufreq_table_index_unsorted(policy, target_freq, min,
						    max, relation);
retry:
	switch (relation) {
	case CPUFREQ_RELATION_L:
		idx = find_index_l(policy, target_freq, min, max, efficiencies);
		break;
	case CPUFREQ_RELATION_H:
		idx = find_index_h(policy, target_freq, min, max, efficiencies);
		break;
	case CPUFREQ_RELATION_C:
		idx = find_index_c(policy, target_freq, min, max, efficiencies);
		break;
	default:
		WARN_ON_ONCE(1);
		return 0;
	}

	/* Limit frequency index to honor min and max */
	if (!cpufreq_is_in_limits(policy, min, max, idx) && efficiencies) {
		efficiencies = false;
		goto retry;
	}

	return idx;
}

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;
}

/**
 * cpufreq_table_set_inefficient() - Mark a frequency as inefficient
 * @policy:	the &struct cpufreq_policy containing the inefficient frequency
 * @frequency:	the inefficient frequency
 *
 * The &struct cpufreq_policy must use a sorted frequency table
 *
 * Return:	%0 on success or a negative errno code
 */

static inline int
cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
			      unsigned int frequency)
{
	struct cpufreq_frequency_table *pos;

	/* Not supported */
	if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)
		return -EINVAL;

	cpufreq_for_each_valid_entry(pos, policy->freq_table) {
		if (pos->frequency == frequency) {
			pos->flags |= CPUFREQ_INEFFICIENT_FREQ;
			policy->efficiencies_available = true;
			return 0;
		}
	}

	return -EINVAL;
}

static inline int parse_perf_domain(int cpu, const char *list_name,
				    const char *cell_name,
				    struct of_phandle_args *args)
{
	int ret;

	struct device_node *cpu_np __free(device_node) = of_cpu_device_node_get(cpu);
	if (!cpu_np)
		return -ENODEV;

	ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0,
					 args);
	if (ret < 0)
		return ret;
	return 0;
}

static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
						     const char *cell_name, struct cpumask *cpumask,
						     struct of_phandle_args *pargs)
{
	int cpu, ret;
	struct of_phandle_args args;

	ret = parse_perf_domain(pcpu, list_name, cell_name, pargs);
	if (ret < 0)
		return ret;

	cpumask_set_cpu(pcpu, cpumask);

	for_each_possible_cpu(cpu) {
		if (cpu == pcpu)
			continue;

		ret = parse_perf_domain(cpu, list_name, cell_name, &args);
		if (ret < 0)
			continue;

		if (of_phandle_args_equal(pargs, &args))
			cpumask_set_cpu(cpu, cpumask);

		of_node_put(args.np);
	}

	return 0;
}
#else
static inline bool cpufreq_boost_enabled(void)
{
	return false;
}

static inline int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
{
	return -EOPNOTSUPP;
}

static inline int
cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
			      unsigned int frequency)
{
	return -EINVAL;
}

static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
						     const char *cell_name, struct cpumask *cpumask,
						     struct of_phandle_args *pargs)
{
	return -EOPNOTSUPP;
}
#endif

extern int arch_freq_get_on_cpu(int cpu);

#ifndef arch_set_freq_scale
static __always_inline
void arch_set_freq_scale(const struct cpumask *cpus,
			 unsigned long cur_freq,
			 unsigned long max_freq)
{
}
#endif

/* 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;
int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);

unsigned int cpufreq_generic_get(unsigned int cpu);
void cpufreq_generic_init(struct cpufreq_policy *policy,
		struct cpufreq_frequency_table *table,
		unsigned int transition_latency);

static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
{
	dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
				  policy->related_cpus);
}
#endif /* _LINUX_CPUFREQ_H */