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cpufreq.h
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/* * 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> #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) /********************************************************************* * 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); extern void disable_cpufreq(void); #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; } static inline void disable_cpufreq(void) { } #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; int cpufreq_get_global_kobject(void); void cpufreq_put_global_kobject(void); int cpufreq_sysfs_create_file(const struct attribute *attr); void cpufreq_sysfs_remove_file(const struct attribute *attr); #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 { /* CPUs sharing clock, require sw coordination */ cpumask_var_t cpus; /* Online CPUs only */ cpumask_var_t related_cpus; /* Online + Offline CPUs */ unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs should set cpufreq */ unsigned int cpu; /* cpu nr of CPU managing this policy */ unsigned int last_cpu; /* cpu nr of previous CPU that managed * this policy */ 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 */ struct cpufreq_governor *governor; /* see below */ void *governor_data; bool governor_enabled; /* governor start/stop flag */ struct work_struct update; /* if update_policy() needs to be * called, but you're in IRQ context */ struct cpufreq_real_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. * * Additional rules: * - Lock should not be held across * __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT); */ 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 */ /* For cpufreq driver's internal use */ void *driver_data; }; #define CPUFREQ_ADJUST (0) #define CPUFREQ_INCOMPATIBLE (1) #define CPUFREQ_NOTIFY (2) #define CPUFREQ_START (3) #define CPUFREQ_UPDATE_POLICY_CPU (4) #define CPUFREQ_CREATE_POLICY (5) #define CPUFREQ_REMOVE_POLICY (6) /* 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*/ static inline bool policy_is_shared(struct cpufreq_policy *policy) { return cpumask_weight(policy->cpus) > 1; } /******************** cpufreq transition notifiers *******************/ #define CPUFREQ_PRECHANGE (0) #define CPUFREQ_POSTCHANGE (1) 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 #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); 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); int cpufreq_register_governor(struct cpufreq_governor *governor); void cpufreq_unregister_governor(struct cpufreq_governor *governor); #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 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 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); /* * 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_supported; bool boost_enabled; int (*set_boost)(int state); }; /* 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 */ /* * 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 fre * 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); 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); 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; } 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); } 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_policy *cpufreq_cpu_get(unsigned int cpu); void cpufreq_cpu_put(struct cpufreq_policy *policy); const char *cpufreq_get_current_driver(void); /********************************************************************* * CPUFREQ 2.6. INTERFACE * *********************************************************************/ 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); #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); unsigned int cpufreq_quick_get_max(unsigned int cpu); #else 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; } #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) #endif /********************************************************************* * FREQUENCY TABLE HELPERS * *********************************************************************/ /* Special Values of .frequency field */ #define CPUFREQ_ENTRY_INVALID ~0 #define CPUFREQ_TABLE_END ~1 /* 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 */ }; static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos) { while ((*pos)->frequency != CPUFREQ_TABLE_END) if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID) return true; else (*pos)++; return false; } /* * 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; cpufreq_next_valid(&pos); pos++) 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); /* the following 3 funtions are 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_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); 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_supported(void); int cpufreq_boost_enabled(void); #else static inline int cpufreq_boost_trigger_state(int state) { return 0; } static inline int cpufreq_boost_supported(void) { return 0; } static inline int cpufreq_boost_enabled(void) { return 0; } #endif #endif /* _LINUX_CPUFREQ_H */
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