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Len Brown4f86d3a2007-10-03 18:58:00 -04001/*
2 * cpuidle.h - a generic framework for CPU idle power management
3 *
4 * (C) 2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
5 * Shaohua Li <shaohua.li@intel.com>
6 * Adam Belay <abelay@novell.com>
7 *
8 * This code is licenced under the GPL.
9 */
10
11#ifndef _LINUX_CPUIDLE_H
12#define _LINUX_CPUIDLE_H
13
14#include <linux/percpu.h>
15#include <linux/list.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040016#include <linux/kobject.h>
17#include <linux/completion.h>
Robert Leee1689792012-03-20 15:22:42 -050018#include <linux/hrtimer.h>
Len Brown4f86d3a2007-10-03 18:58:00 -040019
Len Brown86239ce2013-02-27 13:18:50 -050020#define CPUIDLE_STATE_MAX 10
Len Brown4f86d3a2007-10-03 18:58:00 -040021#define CPUIDLE_NAME_LEN 16
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -080022#define CPUIDLE_DESC_LEN 32
Len Brown4f86d3a2007-10-03 18:58:00 -040023
Paul Gortmakerde477252011-05-26 13:46:22 -040024struct module;
25
Len Brown4f86d3a2007-10-03 18:58:00 -040026struct cpuidle_device;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +053027struct cpuidle_driver;
Len Brown4f86d3a2007-10-03 18:58:00 -040028
29
30/****************************
31 * CPUIDLE DEVICE INTERFACE *
32 ****************************/
33
Deepthi Dharwar42027352011-10-28 16:20:33 +053034struct cpuidle_state_usage {
ShuoX Liudc7fd272012-07-03 19:05:31 +020035 unsigned long long disable;
Deepthi Dharwar42027352011-10-28 16:20:33 +053036 unsigned long long usage;
37 unsigned long long time; /* in US */
38};
39
Len Brown4f86d3a2007-10-03 18:58:00 -040040struct cpuidle_state {
41 char name[CPUIDLE_NAME_LEN];
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -080042 char desc[CPUIDLE_DESC_LEN];
Len Brown4f86d3a2007-10-03 18:58:00 -040043
44 unsigned int flags;
45 unsigned int exit_latency; /* in US */
Boris Ostrovsky02401c02012-03-13 19:55:10 +010046 int power_usage; /* in mW */
Len Brown4f86d3a2007-10-03 18:58:00 -040047 unsigned int target_residency; /* in US */
Rafael J. Wysockicbc9ef02012-07-03 19:07:42 +020048 bool disabled; /* disabled on all CPUs */
Len Brown4f86d3a2007-10-03 18:58:00 -040049
Len Brown4f86d3a2007-10-03 18:58:00 -040050 int (*enter) (struct cpuidle_device *dev,
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +053051 struct cpuidle_driver *drv,
Deepthi Dharware978aa72011-10-28 16:20:09 +053052 int index);
Boris Ostrovsky1a022e32012-03-13 19:55:09 +010053
54 int (*enter_dead) (struct cpuidle_device *dev, int index);
Len Brown4f86d3a2007-10-03 18:58:00 -040055};
56
57/* Idle State Flags */
58#define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
Colin Cross4126c012012-05-07 17:57:41 -070059#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */
Daniel Lezcanob60e6a02013-03-21 12:21:31 +000060#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */
Len Brown4f86d3a2007-10-03 18:58:00 -040061
62#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
63
Len Brown4f86d3a2007-10-03 18:58:00 -040064struct cpuidle_device {
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -040065 unsigned int registered:1;
Harvey Harrisonb5556a62008-02-06 22:39:44 +010066 unsigned int enabled:1;
Len Brown4f86d3a2007-10-03 18:58:00 -040067 unsigned int cpu;
68
69 int last_residency;
70 int state_count;
Deepthi Dharwar42027352011-10-28 16:20:33 +053071 struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
Len Brown4f86d3a2007-10-03 18:58:00 -040072 struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +000073 struct cpuidle_driver_kobj *kobj_driver;
Len Brown4f86d3a2007-10-03 18:58:00 -040074 struct list_head device_list;
75 struct kobject kobj;
76 struct completion kobj_unregister;
Colin Cross4126c012012-05-07 17:57:41 -070077
78#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
79 int safe_state_index;
80 cpumask_t coupled_cpus;
81 struct cpuidle_coupled *coupled;
82#endif
Len Brown4f86d3a2007-10-03 18:58:00 -040083};
84
85DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);
86
87/**
88 * cpuidle_get_last_residency - retrieves the last state's residency time
89 * @dev: the target CPU
90 *
91 * NOTE: this value is invalid if CPUIDLE_FLAG_TIME_VALID isn't set
92 */
93static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
94{
95 return dev->last_residency;
96}
97
98
99/****************************
100 * CPUIDLE DRIVER INTERFACE *
101 ****************************/
102
103struct cpuidle_driver {
Daniel Lezcanodb70b042012-03-26 14:51:27 +0200104 const char *name;
Len Brown4f86d3a2007-10-03 18:58:00 -0400105 struct module *owner;
Daniel Lezcano42f67f22012-10-31 16:44:45 +0000106 int refcnt;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530107
Daniel Lezcanoa06df062013-03-27 10:22:10 +0000108 /* used by the cpuidle framework to setup the broadcast timer */
109 unsigned int bctimer:1;
Daniel Lezcano8aef33a2013-01-15 14:18:04 +0100110 /* states array must be ordered in decreasing power consumption */
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530111 struct cpuidle_state states[CPUIDLE_STATE_MAX];
112 int state_count;
113 int safe_state_index;
Len Brown4f86d3a2007-10-03 18:58:00 -0400114};
115
116#ifdef CONFIG_CPU_IDLE
Len Brownd91ee582011-04-01 18:28:35 -0400117extern void disable_cpuidle(void);
Len Browna0bfa132011-04-01 19:34:59 -0400118extern int cpuidle_idle_call(void);
Len Brown4f86d3a2007-10-03 18:58:00 -0400119extern int cpuidle_register_driver(struct cpuidle_driver *drv);
Rafael J. Wysocki6e797a02012-06-16 15:20:11 +0200120extern struct cpuidle_driver *cpuidle_get_driver(void);
121extern struct cpuidle_driver *cpuidle_driver_ref(void);
122extern void cpuidle_driver_unref(void);
Len Brown4f86d3a2007-10-03 18:58:00 -0400123extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
124extern int cpuidle_register_device(struct cpuidle_device *dev);
125extern void cpuidle_unregister_device(struct cpuidle_device *dev);
Daniel Lezcano4c637b22013-04-23 08:54:33 +0000126extern int cpuidle_register(struct cpuidle_driver *drv,
127 const struct cpumask *const coupled_cpus);
128extern void cpuidle_unregister(struct cpuidle_driver *drv);
Len Brown4f86d3a2007-10-03 18:58:00 -0400129extern void cpuidle_pause_and_lock(void);
130extern void cpuidle_resume_and_unlock(void);
Preeti U Murthy8651f972012-07-09 10:12:56 +0200131extern void cpuidle_pause(void);
132extern void cpuidle_resume(void);
Len Brown4f86d3a2007-10-03 18:58:00 -0400133extern int cpuidle_enable_device(struct cpuidle_device *dev);
134extern void cpuidle_disable_device(struct cpuidle_device *dev);
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100135extern int cpuidle_play_dead(void);
136
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000137extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
138extern int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu);
139extern void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu);
140
Len Brown4f86d3a2007-10-03 18:58:00 -0400141#else
Len Brownd91ee582011-04-01 18:28:35 -0400142static inline void disable_cpuidle(void) { }
Len Browna0bfa132011-04-01 19:34:59 -0400143static inline int cpuidle_idle_call(void) { return -ENODEV; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400144static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
Len Brown6b2c6762010-05-11 16:50:52 -0400145{return -ENODEV; }
Len Brown752138d2010-05-22 16:57:26 -0400146static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
Rafael J. Wysocki6e797a02012-06-16 15:20:11 +0200147static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; }
148static inline void cpuidle_driver_unref(void) {}
Len Brown4f86d3a2007-10-03 18:58:00 -0400149static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
150static inline int cpuidle_register_device(struct cpuidle_device *dev)
Len Brown6b2c6762010-05-11 16:50:52 -0400151{return -ENODEV; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400152static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { }
Daniel Lezcano4c637b22013-04-23 08:54:33 +0000153static inline int cpuidle_register(struct cpuidle_driver *drv,
154 const struct cpumask *const coupled_cpus)
155{return -ENODEV; }
156static inline void cpuidle_unregister(struct cpuidle_driver *drv) { }
Len Brown4f86d3a2007-10-03 18:58:00 -0400157static inline void cpuidle_pause_and_lock(void) { }
158static inline void cpuidle_resume_and_unlock(void) { }
Preeti U Murthy8651f972012-07-09 10:12:56 +0200159static inline void cpuidle_pause(void) { }
160static inline void cpuidle_resume(void) { }
Len Brown4f86d3a2007-10-03 18:58:00 -0400161static inline int cpuidle_enable_device(struct cpuidle_device *dev)
Len Brown6b2c6762010-05-11 16:50:52 -0400162{return -ENODEV; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400163static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100164static inline int cpuidle_play_dead(void) {return -ENODEV; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400165#endif
166
Colin Cross20ff51a2012-05-07 17:57:42 -0700167#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
168void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a);
Arnd Bergmannc7a9b092012-08-15 20:51:54 +0000169#else
170static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a)
171{
172}
Colin Cross20ff51a2012-05-07 17:57:42 -0700173#endif
174
Len Brown4f86d3a2007-10-03 18:58:00 -0400175/******************************
176 * CPUIDLE GOVERNOR INTERFACE *
177 ******************************/
178
179struct cpuidle_governor {
180 char name[CPUIDLE_NAME_LEN];
181 struct list_head governor_list;
182 unsigned int rating;
183
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530184 int (*enable) (struct cpuidle_driver *drv,
185 struct cpuidle_device *dev);
186 void (*disable) (struct cpuidle_driver *drv,
187 struct cpuidle_device *dev);
Len Brown4f86d3a2007-10-03 18:58:00 -0400188
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530189 int (*select) (struct cpuidle_driver *drv,
190 struct cpuidle_device *dev);
Deepthi Dharware978aa72011-10-28 16:20:09 +0530191 void (*reflect) (struct cpuidle_device *dev, int index);
Len Brown4f86d3a2007-10-03 18:58:00 -0400192
193 struct module *owner;
194};
195
196#ifdef CONFIG_CPU_IDLE
197
198extern int cpuidle_register_governor(struct cpuidle_governor *gov);
199extern void cpuidle_unregister_governor(struct cpuidle_governor *gov);
200
201#else
202
203static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
204{return 0;}
205static inline void cpuidle_unregister_governor(struct cpuidle_governor *gov) { }
206
207#endif
208
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800209#ifdef CONFIG_ARCH_HAS_CPU_RELAX
210#define CPUIDLE_DRIVER_STATE_START 1
211#else
212#define CPUIDLE_DRIVER_STATE_START 0
213#endif
214
Len Brown4f86d3a2007-10-03 18:58:00 -0400215#endif /* _LINUX_CPUIDLE_H */