From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- include/linux/cpufreq.h | 418 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 418 insertions(+) create mode 100644 include/linux/cpufreq.h (limited to 'include/linux/cpufreq.h') diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h new file mode 100644 index 00000000..a5699622 --- /dev/null +++ b/include/linux/cpufreq.h @@ -0,0 +1,418 @@ +/* + * linux/include/linux/cpufreq.h + * + * Copyright (C) 2001 Russell King + * (C) 2002 - 2003 Dominik Brodowski + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CPUFREQ_NAME_LEN 16 + + +/********************************************************************* + * CPUFREQ NOTIFIER INTERFACE * + *********************************************************************/ + +#define CPUFREQ_TRANSITION_NOTIFIER (0) +#define CPUFREQ_POLICY_NOTIFIER (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); +#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 */ + +/* 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) + +/* Frequency values here are CPU kHz so that hardware which doesn't run + * with some frequencies can complain without having to guess what per + * cent / per mille means. + * Maximum transition latency is in nanoseconds - if it's unknown, + * CPUFREQ_ETERNAL shall be used. + */ + +struct cpufreq_governor; + +/* /sys/devices/system/cpu/cpufreq: entry point for global variables */ +extern struct kobject *cpufreq_global_kobject; + +/* For some peripheral devices, which will generate irq very frequently + * and take very short time to handle irq, in this scenario, CPUFreq will + * not issue cpu freq change, but the devices' performance will be impacted + * significantly, we need to add irq number check to be as one condition of + * CPU freq change. */ +#define MAX_CPUFREQ_IRQ_NUMBER 20 +struct irq_tuner { + unsigned int irq_number; + unsigned int up_threshold; + bool enable; +}; + +#define CPUFREQ_ETERNAL (-1) +struct cpufreq_cpuinfo { + unsigned int max_freq; + unsigned int min_freq; + + /* in 10^(-9) s = nanoseconds */ + unsigned int transition_latency; +}; + +struct cpufreq_real_policy { + unsigned int min; /* in kHz */ + unsigned int max; /* in kHz */ + unsigned int policy; /* see above */ + struct cpufreq_governor *governor; /* see below */ +}; + +struct cpufreq_policy { + cpumask_var_t cpus; /* CPUs requiring sw coordination */ + cpumask_var_t related_cpus; /* CPUs with any coordination */ + unsigned int shared_type; /* ANY or ALL affected CPUs + should set cpufreq */ + unsigned int cpu; /* cpu nr of registered CPU */ + 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 policy; /* see above */ + struct cpufreq_governor *governor; /* see below */ + + struct work_struct update; /* if update_policy() needs to be + * called, but you're in IRQ context */ + + struct cpufreq_real_policy user_policy; + + struct kobject kobj; + struct completion kobj_unregister; +}; + +#define CPUFREQ_ADJUST (0) +#define CPUFREQ_INCOMPATIBLE (1) +#define CPUFREQ_NOTIFY (2) +#define CPUFREQ_START (3) + +#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*/ + +/******************** cpufreq transition notifiers *******************/ + +#define CPUFREQ_PRECHANGE (0) +#define CPUFREQ_POSTCHANGE (1) +#define CPUFREQ_RESUMECHANGE (8) +#define CPUFREQ_SUSPENDCHANGE (9) + +struct cpufreq_freqs { + unsigned int cpu; /* cpu nr */ + unsigned int old; + unsigned int new; + u8 flags; /* flags of cpufreq_driver, see below. */ +}; + + +/** + * 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_GOV_START 1 +#define CPUFREQ_GOV_STOP 2 +#define CPUFREQ_GOV_LIMITS 3 + +struct cpufreq_governor { + char name[CPUFREQ_NAME_LEN]; + 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. + */ +extern int cpufreq_driver_target(struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation); +extern int __cpufreq_driver_target(struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation); + + +extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy, + unsigned int cpu); + +int cpufreq_register_governor(struct cpufreq_governor *governor); +void cpufreq_unregister_governor(struct cpufreq_governor *governor); + + +/********************************************************************* + * 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 */ + +struct freq_attr; + +struct cpufreq_driver { + struct module *owner; + char name[CPUFREQ_NAME_LEN]; + u8 flags; + + /* 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); + int (*target) (struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation); + + /* should be defined, if possible */ + unsigned int (*get) (unsigned int cpu); + + /* optional */ + unsigned int (*getavg) (struct cpufreq_policy *policy, + unsigned int cpu); + int (*bios_limit) (int cpu, unsigned int *limit); + + int (*exit) (struct cpufreq_policy *policy); + int (*suspend) (struct cpufreq_policy *policy); + int (*resume) (struct cpufreq_policy *policy); + struct freq_attr **attr; +}; + +/* flags */ + +#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if + * all ->init() calls failed */ +#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel + * "constants" aren't affected by + * frequency transitions */ +#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed + * mismatches */ + +int cpufreq_register_driver(struct cpufreq_driver *driver_data); +int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); + + +void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state); + + +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; +} + +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) + + +/********************************************************************* + * CPUFREQ 2.6. INTERFACE * + *********************************************************************/ +int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); +int cpufreq_update_policy(unsigned int cpu); + +#ifdef CONFIG_CPU_FREQ +/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ +unsigned int cpufreq_get(unsigned int cpu); +#else +static inline unsigned int cpufreq_get(unsigned int cpu) +{ + return 0; +} +#endif + +/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ +#ifdef CONFIG_CPU_FREQ +unsigned int cpufreq_quick_get(unsigned int cpu); +#else +static inline unsigned int cpufreq_quick_get(unsigned int cpu) +{ + return 0; +} +#endif + + +/********************************************************************* + * CPUFREQ DEFAULT GOVERNOR * + *********************************************************************/ + + +/* + Performance governor is fallback governor if any other gov failed to + auto load due latency restrictions +*/ +#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE +extern struct cpufreq_governor cpufreq_gov_performance; +#endif +#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE +#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) +#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) +extern struct cpufreq_governor cpufreq_gov_powersave; +#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) +#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) +extern struct cpufreq_governor cpufreq_gov_userspace; +#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) +#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) +extern struct cpufreq_governor cpufreq_gov_ondemand; +#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) +#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) +extern struct cpufreq_governor cpufreq_gov_conservative; +#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) +#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE) +extern struct cpufreq_governor cpufreq_gov_interactive; +#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_interactive) +#endif + + +/********************************************************************* + * FREQUENCY TABLE HELPERS * + *********************************************************************/ + +#define CPUFREQ_ENTRY_INVALID ~0 +#define CPUFREQ_TABLE_END ~1 + +struct cpufreq_frequency_table { + unsigned int index; /* any */ + unsigned int frequency; /* kHz - doesn't need to be in ascending + * order */ +}; + +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_frequency_table_target(struct cpufreq_policy *policy, + struct cpufreq_frequency_table *table, + unsigned int target_freq, + unsigned int relation, + unsigned int *index); + +/* the following 3 funtions are for cpufreq core use only */ +struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); +struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); +void cpufreq_cpu_put(struct cpufreq_policy *data); + +/* the following are really really optional */ +extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; + +void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, + unsigned int cpu); + +void cpufreq_frequency_table_put_attr(unsigned int cpu); + + +#endif /* _LINUX_CPUFREQ_H */ -- cgit v1.2.3