581 lines
18 KiB
C
581 lines
18 KiB
C
/*
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* linux/include/linux/cpufreq.h
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*
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* Copyright (C) 2001 Russell King
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* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _LINUX_CPUFREQ_H
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#define _LINUX_CPUFREQ_H
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#include <linux/clk.h>
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#include <linux/cpumask.h>
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#include <linux/completion.h>
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#include <linux/kobject.h>
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#include <linux/notifier.h>
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#include <linux/spinlock.h>
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#include <linux/sysfs.h>
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/*********************************************************************
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* CPUFREQ INTERFACE *
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*********************************************************************/
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/*
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* Frequency values here are CPU kHz
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*
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* Maximum transition latency is in nanoseconds - if it's unknown,
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* CPUFREQ_ETERNAL shall be used.
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*/
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#define CPUFREQ_ETERNAL (-1)
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#define CPUFREQ_NAME_LEN 16
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/* Print length for names. Extra 1 space for accomodating '\n' in prints */
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#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
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struct cpufreq_governor;
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struct cpufreq_freqs {
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unsigned int cpu; /* cpu nr */
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unsigned int old;
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unsigned int new;
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u8 flags; /* flags of cpufreq_driver, see below. */
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};
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struct cpufreq_cpuinfo {
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unsigned int max_freq;
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unsigned int min_freq;
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/* in 10^(-9) s = nanoseconds */
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unsigned int transition_latency;
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};
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struct cpufreq_user_policy {
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unsigned int min; /* in kHz */
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unsigned int max; /* in kHz */
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};
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struct cpufreq_policy {
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/* CPUs sharing clock, require sw coordination */
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cpumask_var_t cpus; /* Online CPUs only */
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cpumask_var_t related_cpus; /* Online + Offline CPUs */
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cpumask_var_t real_cpus; /* Related and present */
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unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
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should set cpufreq */
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unsigned int cpu; /* cpu managing this policy, must be online */
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struct clk *clk;
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struct cpufreq_cpuinfo cpuinfo;/* see above */
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unsigned int min; /* in kHz */
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unsigned int max; /* in kHz */
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unsigned int cur; /* in kHz, only needed if cpufreq
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* governors are used */
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unsigned int restore_freq; /* = policy->cur before transition */
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unsigned int suspend_freq; /* freq to set during suspend */
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unsigned int policy; /* see above */
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unsigned int last_policy; /* policy before unplug */
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struct cpufreq_governor *governor; /* see below */
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void *governor_data;
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char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
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struct work_struct update; /* if update_policy() needs to be
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* called, but you're in IRQ context */
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struct cpufreq_user_policy user_policy;
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struct cpufreq_frequency_table *freq_table;
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struct list_head policy_list;
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struct kobject kobj;
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struct completion kobj_unregister;
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/*
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* The rules for this semaphore:
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* - Any routine that wants to read from the policy structure will
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* do a down_read on this semaphore.
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* - Any routine that will write to the policy structure and/or may take away
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* the policy altogether (eg. CPU hotplug), will hold this lock in write
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* mode before doing so.
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*/
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struct rw_semaphore rwsem;
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/* Synchronization for frequency transitions */
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bool transition_ongoing; /* Tracks transition status */
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spinlock_t transition_lock;
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wait_queue_head_t transition_wait;
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struct task_struct *transition_task; /* Task which is doing the transition */
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/* cpufreq-stats */
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struct cpufreq_stats *stats;
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/* For cpufreq driver's internal use */
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void *driver_data;
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};
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/* Only for ACPI */
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#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
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#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
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#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
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#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
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#ifdef CONFIG_CPU_FREQ
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struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
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struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
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void cpufreq_cpu_put(struct cpufreq_policy *policy);
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#else
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static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
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{
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return NULL;
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}
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static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
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{
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return NULL;
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}
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static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
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#endif
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static inline bool policy_is_shared(struct cpufreq_policy *policy)
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{
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return cpumask_weight(policy->cpus) > 1;
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}
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/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
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extern struct kobject *cpufreq_global_kobject;
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#ifdef CONFIG_CPU_FREQ
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unsigned int cpufreq_get(unsigned int cpu);
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unsigned int cpufreq_quick_get(unsigned int cpu);
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unsigned int cpufreq_quick_get_max(unsigned int cpu);
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void disable_cpufreq(void);
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u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
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int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
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int cpufreq_update_policy(unsigned int cpu);
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bool have_governor_per_policy(void);
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struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
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#else
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static inline unsigned int cpufreq_get(unsigned int cpu)
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{
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return 0;
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}
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static inline unsigned int cpufreq_quick_get(unsigned int cpu)
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{
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return 0;
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}
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static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
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{
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return 0;
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}
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static inline void disable_cpufreq(void) { }
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#endif
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/*********************************************************************
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* CPUFREQ DRIVER INTERFACE *
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*********************************************************************/
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#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
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#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
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#define CPUFREQ_RELATION_C 2 /* closest frequency to target */
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struct freq_attr {
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struct attribute attr;
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ssize_t (*show)(struct cpufreq_policy *, char *);
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ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
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};
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#define cpufreq_freq_attr_ro(_name) \
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static struct freq_attr _name = \
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__ATTR(_name, 0444, show_##_name, NULL)
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#define cpufreq_freq_attr_ro_perm(_name, _perm) \
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static struct freq_attr _name = \
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__ATTR(_name, _perm, show_##_name, NULL)
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#define cpufreq_freq_attr_rw(_name) \
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static struct freq_attr _name = \
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__ATTR(_name, 0644, show_##_name, store_##_name)
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struct global_attr {
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struct attribute attr;
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ssize_t (*show)(struct kobject *kobj,
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struct attribute *attr, char *buf);
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ssize_t (*store)(struct kobject *a, struct attribute *b,
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const char *c, size_t count);
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};
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#define define_one_global_ro(_name) \
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static struct global_attr _name = \
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__ATTR(_name, 0444, show_##_name, NULL)
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#define define_one_global_rw(_name) \
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static struct global_attr _name = \
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__ATTR(_name, 0644, show_##_name, store_##_name)
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struct cpufreq_driver {
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char name[CPUFREQ_NAME_LEN];
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u8 flags;
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void *driver_data;
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/* needed by all drivers */
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int (*init)(struct cpufreq_policy *policy);
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int (*verify)(struct cpufreq_policy *policy);
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/* define one out of two */
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int (*setpolicy)(struct cpufreq_policy *policy);
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/*
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* On failure, should always restore frequency to policy->restore_freq
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* (i.e. old freq).
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*/
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int (*target)(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation); /* Deprecated */
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int (*target_index)(struct cpufreq_policy *policy,
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unsigned int index);
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/*
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* Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
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* unset.
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*
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* get_intermediate should return a stable intermediate frequency
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* platform wants to switch to and target_intermediate() should set CPU
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* to to that frequency, before jumping to the frequency corresponding
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* to 'index'. Core will take care of sending notifications and driver
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* doesn't have to handle them in target_intermediate() or
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* target_index().
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*
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* Drivers can return '0' from get_intermediate() in case they don't
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* wish to switch to intermediate frequency for some target frequency.
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* In that case core will directly call ->target_index().
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*/
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unsigned int (*get_intermediate)(struct cpufreq_policy *policy,
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unsigned int index);
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int (*target_intermediate)(struct cpufreq_policy *policy,
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unsigned int index);
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/* should be defined, if possible */
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unsigned int (*get)(unsigned int cpu);
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/* optional */
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int (*bios_limit)(int cpu, unsigned int *limit);
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int (*exit)(struct cpufreq_policy *policy);
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void (*stop_cpu)(struct cpufreq_policy *policy);
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int (*suspend)(struct cpufreq_policy *policy);
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int (*resume)(struct cpufreq_policy *policy);
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/* Will be called after the driver is fully initialized */
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void (*ready)(struct cpufreq_policy *policy);
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struct freq_attr **attr;
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/* platform specific boost support code */
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bool boost_enabled;
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int (*set_boost)(int state);
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};
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/* flags */
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#define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if
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all ->init() calls failed */
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#define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other
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kernel "constants" aren't
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affected by frequency
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transitions */
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#define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume
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speed mismatches */
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/*
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* This should be set by platforms having multiple clock-domains, i.e.
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* supporting multiple policies. With this sysfs directories of governor would
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* be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
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* governor with different tunables for different clusters.
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*/
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#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
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/*
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* Driver will do POSTCHANGE notifications from outside of their ->target()
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* routine and so must set cpufreq_driver->flags with this flag, so that core
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* can handle them specially.
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*/
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#define CPUFREQ_ASYNC_NOTIFICATION (1 << 4)
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/*
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* Set by drivers which want cpufreq core to check if CPU is running at a
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* frequency present in freq-table exposed by the driver. For these drivers if
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* CPU is found running at an out of table freq, we will try to set it to a freq
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* from the table. And if that fails, we will stop further boot process by
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* issuing a BUG_ON().
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*/
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#define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
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int cpufreq_register_driver(struct cpufreq_driver *driver_data);
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int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
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const char *cpufreq_get_current_driver(void);
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void *cpufreq_get_driver_data(void);
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static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
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unsigned int min, unsigned int max)
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{
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if (policy->min < min)
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policy->min = min;
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if (policy->max < min)
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policy->max = min;
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if (policy->min > max)
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policy->min = max;
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if (policy->max > max)
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policy->max = max;
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if (policy->min > policy->max)
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policy->min = policy->max;
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return;
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}
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static inline void
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cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
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{
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cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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}
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#ifdef CONFIG_CPU_FREQ
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void cpufreq_suspend(void);
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void cpufreq_resume(void);
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int cpufreq_generic_suspend(struct cpufreq_policy *policy);
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#else
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static inline void cpufreq_suspend(void) {}
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static inline void cpufreq_resume(void) {}
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#endif
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/*********************************************************************
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* CPUFREQ NOTIFIER INTERFACE *
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*********************************************************************/
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#define CPUFREQ_TRANSITION_NOTIFIER (0)
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#define CPUFREQ_POLICY_NOTIFIER (1)
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/* Transition notifiers */
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#define CPUFREQ_PRECHANGE (0)
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#define CPUFREQ_POSTCHANGE (1)
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/* Policy Notifiers */
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#define CPUFREQ_ADJUST (0)
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#define CPUFREQ_NOTIFY (1)
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#define CPUFREQ_START (2)
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#define CPUFREQ_CREATE_POLICY (3)
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#define CPUFREQ_REMOVE_POLICY (4)
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#ifdef CONFIG_CPU_FREQ
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int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
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int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
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void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
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struct cpufreq_freqs *freqs);
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void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
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struct cpufreq_freqs *freqs, int transition_failed);
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#else /* CONFIG_CPU_FREQ */
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static inline int cpufreq_register_notifier(struct notifier_block *nb,
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unsigned int list)
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{
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return 0;
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}
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static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
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unsigned int list)
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{
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return 0;
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}
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#endif /* !CONFIG_CPU_FREQ */
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/**
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* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
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* safe)
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* @old: old value
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* @div: divisor
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* @mult: multiplier
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*
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*
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* new = old * mult / div
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*/
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static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
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u_int mult)
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{
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#if BITS_PER_LONG == 32
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u64 result = ((u64) old) * ((u64) mult);
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do_div(result, div);
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return (unsigned long) result;
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#elif BITS_PER_LONG == 64
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unsigned long result = old * ((u64) mult);
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result /= div;
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return result;
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#endif
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}
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/*********************************************************************
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* CPUFREQ GOVERNORS *
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*********************************************************************/
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/*
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* If (cpufreq_driver->target) exists, the ->governor decides what frequency
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* within the limits is used. If (cpufreq_driver->setpolicy> exists, these
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* two generic policies are available:
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*/
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#define CPUFREQ_POLICY_POWERSAVE (1)
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#define CPUFREQ_POLICY_PERFORMANCE (2)
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/* Governor Events */
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#define CPUFREQ_GOV_START 1
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#define CPUFREQ_GOV_STOP 2
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#define CPUFREQ_GOV_LIMITS 3
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#define CPUFREQ_GOV_POLICY_INIT 4
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#define CPUFREQ_GOV_POLICY_EXIT 5
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struct cpufreq_governor {
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char name[CPUFREQ_NAME_LEN];
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int initialized;
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int (*governor) (struct cpufreq_policy *policy,
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unsigned int event);
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ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
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char *buf);
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int (*store_setspeed) (struct cpufreq_policy *policy,
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unsigned int freq);
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unsigned int max_transition_latency; /* HW must be able to switch to
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next freq faster than this value in nano secs or we
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will fallback to performance governor */
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struct list_head governor_list;
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struct module *owner;
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};
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/* Pass a target to the cpufreq driver */
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int cpufreq_driver_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation);
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int __cpufreq_driver_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation);
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int cpufreq_register_governor(struct cpufreq_governor *governor);
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void cpufreq_unregister_governor(struct cpufreq_governor *governor);
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struct cpufreq_governor *cpufreq_default_governor(void);
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struct cpufreq_governor *cpufreq_fallback_governor(void);
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/*********************************************************************
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* FREQUENCY TABLE HELPERS *
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*********************************************************************/
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/* Special Values of .frequency field */
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#define CPUFREQ_ENTRY_INVALID ~0u
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#define CPUFREQ_TABLE_END ~1u
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/* Special Values of .flags field */
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#define CPUFREQ_BOOST_FREQ (1 << 0)
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struct cpufreq_frequency_table {
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unsigned int flags;
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unsigned int driver_data; /* driver specific data, not used by core */
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unsigned int frequency; /* kHz - doesn't need to be in ascending
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* order */
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};
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#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
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int dev_pm_opp_init_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table);
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void dev_pm_opp_free_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table **table);
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#else
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static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table
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**table)
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{
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return -EINVAL;
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}
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static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
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struct cpufreq_frequency_table
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**table)
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{
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}
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#endif
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/*
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* cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
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* @pos: the cpufreq_frequency_table * to use as a loop cursor.
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* @table: the cpufreq_frequency_table * to iterate over.
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*/
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#define cpufreq_for_each_entry(pos, table) \
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for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
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/*
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* cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
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* excluding CPUFREQ_ENTRY_INVALID frequencies.
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* @pos: the cpufreq_frequency_table * to use as a loop cursor.
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* @table: the cpufreq_frequency_table * to iterate over.
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*/
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#define cpufreq_for_each_valid_entry(pos, table) \
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for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
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if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
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continue; \
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else
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int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table);
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int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table);
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int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
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|
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int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table,
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unsigned int target_freq,
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unsigned int relation,
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|
unsigned int *index);
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int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
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unsigned int freq);
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|
|
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ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
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|
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#ifdef CONFIG_CPU_FREQ
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int cpufreq_boost_trigger_state(int state);
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int cpufreq_boost_enabled(void);
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int cpufreq_enable_boost_support(void);
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bool policy_has_boost_freq(struct cpufreq_policy *policy);
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#else
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static inline int cpufreq_boost_trigger_state(int state)
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{
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return 0;
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}
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static inline int cpufreq_boost_enabled(void)
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|
{
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return 0;
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}
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|
|
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static inline int cpufreq_enable_boost_support(void)
|
|
{
|
|
return -EINVAL;
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|
}
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|
|
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static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
|
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{
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return false;
|
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}
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#endif
|
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/* the following funtion is for cpufreq core use only */
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struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
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|
|
|
/* the following are really really optional */
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|
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
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extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
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extern struct freq_attr *cpufreq_generic_attr[];
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int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
|
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struct cpufreq_frequency_table *table);
|
|
|
|
unsigned int cpufreq_generic_get(unsigned int cpu);
|
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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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