383 lines
12 KiB
C
383 lines
12 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/mutex.h>
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#include <linux/notifier.h>
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#include <linux/threads.h>
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#include <linux/device.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/completion.h>
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#include <linux/workqueue.h>
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#include <linux/cpumask.h>
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#include <asm/div64.h>
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#define CPUFREQ_NAME_LEN 16
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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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#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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#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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/* 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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/* Frequency values here are CPU kHz so that hardware which doesn't run
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* with some frequencies can complain without having to guess what per
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* cent / per mille means.
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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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struct cpufreq_governor;
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#define CPUFREQ_ETERNAL (-1)
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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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unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */
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};
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struct cpufreq_real_policy {
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unsigned int min; /* in kHz */
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unsigned int max; /* in kHz */
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unsigned int policy; /* see above */
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struct cpufreq_governor *governor; /* see below */
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};
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struct cpufreq_policy {
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cpumask_t cpus; /* CPUs requiring sw coordination */
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cpumask_t related_cpus; /* CPUs with any coordination */
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unsigned int shared_type; /* ANY or ALL affected CPUs
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should set cpufreq */
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unsigned int cpu; /* cpu nr of registered CPU */
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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 policy; /* see above */
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struct cpufreq_governor *governor; /* see below */
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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_real_policy user_policy;
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struct kobject kobj;
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struct completion kobj_unregister;
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};
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#define CPUFREQ_ADJUST (0)
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#define CPUFREQ_INCOMPATIBLE (1)
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#define CPUFREQ_NOTIFY (2)
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#define CPUFREQ_START (3)
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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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/******************** cpufreq transition notifiers *******************/
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#define CPUFREQ_PRECHANGE (0)
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#define CPUFREQ_POSTCHANGE (1)
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#define CPUFREQ_RESUMECHANGE (8)
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#define CPUFREQ_SUSPENDCHANGE (9)
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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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/**
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* cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch 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, 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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#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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struct cpufreq_governor {
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char name[CPUFREQ_NAME_LEN];
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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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*/
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extern 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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extern 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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extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);
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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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int lock_policy_rwsem_read(int cpu);
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int lock_policy_rwsem_write(int cpu);
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void unlock_policy_rwsem_read(int cpu);
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void unlock_policy_rwsem_write(int cpu);
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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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struct freq_attr;
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struct cpufreq_driver {
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struct module *owner;
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char name[CPUFREQ_NAME_LEN];
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u8 flags;
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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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int (*target) (struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation);
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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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unsigned int (*getavg) (unsigned int cpu);
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int (*exit) (struct cpufreq_policy *policy);
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int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg);
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int (*resume) (struct cpufreq_policy *policy);
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struct freq_attr **attr;
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};
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/* flags */
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#define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if
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* all ->init() calls failed */
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#define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel
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* "constants" aren't affected by
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* frequency transitions */
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#define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed
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* mismatches */
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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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void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);
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static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, 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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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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/*********************************************************************
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* CPUFREQ 2.6. INTERFACE *
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*********************************************************************/
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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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/* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */
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unsigned int cpufreq_get(unsigned int cpu);
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/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */
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#ifdef CONFIG_CPU_FREQ
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unsigned int cpufreq_quick_get(unsigned int cpu);
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#else
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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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#endif
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/*********************************************************************
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* CPUFREQ DEFAULT GOVERNOR *
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*********************************************************************/
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/*
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Performance governor is fallback governor if any other gov failed to
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auto load due latency restrictions
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*/
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#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
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extern struct cpufreq_governor cpufreq_gov_performance;
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#endif
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#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
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#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance)
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#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
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extern struct cpufreq_governor cpufreq_gov_powersave;
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#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave)
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#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
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extern struct cpufreq_governor cpufreq_gov_userspace;
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#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace)
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#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
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extern struct cpufreq_governor cpufreq_gov_ondemand;
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#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand)
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#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
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extern struct cpufreq_governor cpufreq_gov_conservative;
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#define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative)
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#endif
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/*********************************************************************
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* FREQUENCY TABLE HELPERS *
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*********************************************************************/
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#define CPUFREQ_ENTRY_INVALID ~0
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#define CPUFREQ_TABLE_END ~1
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struct cpufreq_frequency_table {
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unsigned int index; /* any */
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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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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_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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/* the following 3 funtions are for cpufreq core use only */
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struct cpufreq_frequency_table *cpufreq_frequency_get_table(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 *data);
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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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void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
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unsigned int cpu);
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void cpufreq_frequency_table_put_attr(unsigned int cpu);
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/*********************************************************************
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* UNIFIED DEBUG HELPERS *
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*********************************************************************/
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#define CPUFREQ_DEBUG_CORE 1
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#define CPUFREQ_DEBUG_DRIVER 2
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#define CPUFREQ_DEBUG_GOVERNOR 4
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#ifdef CONFIG_CPU_FREQ_DEBUG
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extern void cpufreq_debug_printk(unsigned int type, const char *prefix,
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const char *fmt, ...);
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#else
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#define cpufreq_debug_printk(msg...) do { } while(0)
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#endif /* CONFIG_CPU_FREQ_DEBUG */
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#endif /* _LINUX_CPUFREQ_H */
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