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gerrit-public.fairphone.software / kernel / msm-4.9 / 0b4e11074a933937ee75be371d32bf91a0051419 / . / include / linux / cpuidle.h
blob: f551a9299ac987c5121a6f58383a953a8704d729 [file] [log] [blame]
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]1/*
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>
Robert Leee1689792012-03-20 15:22:42 -0500[diff] [blame]16#include <linux/hrtimer.h>
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]17
Len Brown86239ce2013-02-27 13:18:50 -0500[diff] [blame]18#define CPUIDLE_STATE_MAX 10
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]19#define CPUIDLE_NAME_LEN 16
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800[diff] [blame]20#define CPUIDLE_DESC_LEN 32
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]21
Paul Gortmakerde477252011-05-26 13:46:22 -0400[diff] [blame]22struct module;
23
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]24struct cpuidle_device;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530[diff] [blame]25struct cpuidle_driver;
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]26
27
28/****************************
29 * CPUIDLE DEVICE INTERFACE *
30 ****************************/
31
Deepthi Dharwar42027352011-10-28 16:20:33 +0530[diff] [blame]32struct cpuidle_state_usage {
ShuoX Liudc7fd272012-07-03 19:05:31 +0200[diff] [blame]33 unsigned long long disable;
Deepthi Dharwar42027352011-10-28 16:20:33 +0530[diff] [blame]34 unsigned long long usage;
35 unsigned long long time; /* in US */
36};
37
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]38struct cpuidle_state {
39 char name[CPUIDLE_NAME_LEN];
Venkatesh Pallipadi4fcb2fc2008-02-11 17:46:31 -0800[diff] [blame]40 char desc[CPUIDLE_DESC_LEN];
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]41
42 unsigned int flags;
43 unsigned int exit_latency; /* in US */
Boris Ostrovsky02401c02012-03-13 19:55:10 +0100[diff] [blame]44 int power_usage; /* in mW */
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]45 unsigned int target_residency; /* in US */
Rafael J. Wysockicbc9ef02012-07-03 19:07:42 +0200[diff] [blame]46 bool disabled; /* disabled on all CPUs */
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]47
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]48 int (*enter) (struct cpuidle_device *dev,
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530[diff] [blame]49 struct cpuidle_driver *drv,
Deepthi Dharware978aa72011-10-28 16:20:09 +0530[diff] [blame]50 int index);
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100[diff] [blame]51
52 int (*enter_dead) (struct cpuidle_device *dev, int index);
Rafael J. Wysocki124cf9112015-02-13 23:50:43 +0100[diff] [blame]53
54 /*
55 * CPUs execute ->enter_freeze with the local tick or entire timekeeping
56 * suspended, so it must not re-enable interrupts at any point (even
57 * temporarily) or attempt to change states of clock event devices.
58 */
59 void (*enter_freeze) (struct cpuidle_device *dev,
60 struct cpuidle_driver *drv,
61 int index);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]62};
63
64/* Idle State Flags */
Colin Cross4126c012012-05-07 17:57:41 -0700[diff] [blame]65#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */
Daniel Lezcanob60e6a02013-03-21 12:21:31 +0000[diff] [blame]66#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]67
68#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
69
Daniel Lezcano728ce222013-06-12 15:08:51 +0200[diff] [blame]70struct cpuidle_device_kobj;
Daniel Lezcano1a706432013-06-12 15:08:52 +0200[diff] [blame]71struct cpuidle_state_kobj;
72struct cpuidle_driver_kobj;
Daniel Lezcano728ce222013-06-12 15:08:51 +0200[diff] [blame]73
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]74struct cpuidle_device {
Venkatesh Pallipadidcb84f32008-05-19 19:09:27 -0400[diff] [blame]75 unsigned int registered:1;
Harvey Harrisonb5556a62008-02-06 22:39:44 +0100[diff] [blame]76 unsigned int enabled:1;
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]77 unsigned int cpu;
78
79 int last_residency;
80 int state_count;
Deepthi Dharwar42027352011-10-28 16:20:33 +0530[diff] [blame]81 struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]82 struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000[diff] [blame]83 struct cpuidle_driver_kobj *kobj_driver;
Daniel Lezcano728ce222013-06-12 15:08:51 +0200[diff] [blame]84 struct cpuidle_device_kobj *kobj_dev;
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]85 struct list_head device_list;
Colin Cross4126c012012-05-07 17:57:41 -0700[diff] [blame]86
87#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
88 int safe_state_index;
89 cpumask_t coupled_cpus;
90 struct cpuidle_coupled *coupled;
91#endif
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]92};
93
94DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);
Paul Burtonf08dbf82014-01-08 11:23:35 +0000[diff] [blame]95DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]96
97/**
98 * cpuidle_get_last_residency - retrieves the last state's residency time
99 * @dev: the target CPU
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]100 */
101static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
102{
103 return dev->last_residency;
104}
105
106
107/****************************
108 * CPUIDLE DRIVER INTERFACE *
109 ****************************/
110
111struct cpuidle_driver {
Daniel Lezcanodb70b042012-03-26 14:51:27 +0200[diff] [blame]112 const char *name;
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]113 struct module *owner;
Daniel Lezcano42f67f22012-10-31 16:44:45 +0000[diff] [blame]114 int refcnt;
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530[diff] [blame]115
Daniel Lezcanoa06df062013-03-27 10:22:10 +0000[diff] [blame]116 /* used by the cpuidle framework to setup the broadcast timer */
117 unsigned int bctimer:1;
Daniel Lezcano8aef33a2013-01-15 14:18:04 +0100[diff] [blame]118 /* states array must be ordered in decreasing power consumption */
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530[diff] [blame]119 struct cpuidle_state states[CPUIDLE_STATE_MAX];
120 int state_count;
121 int safe_state_index;
Daniel Lezcano82467a52013-06-07 21:53:09 +0000[diff] [blame]122
123 /* the driver handles the cpus in cpumask */
Viresh Kumar6587fca2013-10-03 21:26:40 +0530[diff] [blame]124 struct cpumask *cpumask;
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]125};
126
127#ifdef CONFIG_CPU_IDLE
Len Brownd91ee582011-04-01 18:28:35 -0400[diff] [blame]128extern void disable_cpuidle(void);
Daniel Lezcano907e30f2014-03-03 08:48:50 +0100[diff] [blame]129
Daniel Lezcano907e30f2014-03-03 08:48:50 +0100[diff] [blame]130extern int cpuidle_select(struct cpuidle_driver *drv,
131 struct cpuidle_device *dev);
132extern int cpuidle_enter(struct cpuidle_driver *drv,
133 struct cpuidle_device *dev, int index);
134extern void cpuidle_reflect(struct cpuidle_device *dev, int index);
135
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]136extern int cpuidle_register_driver(struct cpuidle_driver *drv);
Rafael J. Wysocki6e797a02012-06-16 15:20:11 +0200[diff] [blame]137extern struct cpuidle_driver *cpuidle_get_driver(void);
138extern struct cpuidle_driver *cpuidle_driver_ref(void);
139extern void cpuidle_driver_unref(void);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]140extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
141extern int cpuidle_register_device(struct cpuidle_device *dev);
142extern void cpuidle_unregister_device(struct cpuidle_device *dev);
Daniel Lezcano4c637b22013-04-23 08:54:33 +0000[diff] [blame]143extern int cpuidle_register(struct cpuidle_driver *drv,
144 const struct cpumask *const coupled_cpus);
145extern void cpuidle_unregister(struct cpuidle_driver *drv);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]146extern void cpuidle_pause_and_lock(void);
147extern void cpuidle_resume_and_unlock(void);
Preeti U Murthy8651f972012-07-09 10:12:56 +0200[diff] [blame]148extern void cpuidle_pause(void);
149extern void cpuidle_resume(void);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]150extern int cpuidle_enable_device(struct cpuidle_device *dev);
151extern void cpuidle_disable_device(struct cpuidle_device *dev);
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100[diff] [blame]152extern int cpuidle_play_dead(void);
Rafael J. Wysocki38106312015-02-12 23:33:15 +0100[diff] [blame]153extern void cpuidle_enter_freeze(void);
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100[diff] [blame]154
Daniel Lezcanobf4d1b52012-10-31 16:44:48 +0000[diff] [blame]155extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]156#else
Len Brownd91ee582011-04-01 18:28:35 -0400[diff] [blame]157static inline void disable_cpuidle(void) { }
Daniel Lezcano907e30f2014-03-03 08:48:50 +0100[diff] [blame]158static inline int cpuidle_select(struct cpuidle_driver *drv,
159 struct cpuidle_device *dev)
160{return -ENODEV; }
161static inline int cpuidle_enter(struct cpuidle_driver *drv,
162 struct cpuidle_device *dev, int index)
163{return -ENODEV; }
164static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { }
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]165static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
Len Brown6b2c6762010-05-11 16:50:52 -0400[diff] [blame]166{return -ENODEV; }
Len Brown752138d2010-05-22 16:57:26 -0400[diff] [blame]167static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
Rafael J. Wysocki6e797a02012-06-16 15:20:11 +0200[diff] [blame]168static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; }
169static inline void cpuidle_driver_unref(void) {}
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]170static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
171static inline int cpuidle_register_device(struct cpuidle_device *dev)
Len Brown6b2c6762010-05-11 16:50:52 -0400[diff] [blame]172{return -ENODEV; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]173static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { }
Daniel Lezcano4c637b22013-04-23 08:54:33 +0000[diff] [blame]174static inline int cpuidle_register(struct cpuidle_driver *drv,
175 const struct cpumask *const coupled_cpus)
176{return -ENODEV; }
177static inline void cpuidle_unregister(struct cpuidle_driver *drv) { }
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]178static inline void cpuidle_pause_and_lock(void) { }
179static inline void cpuidle_resume_and_unlock(void) { }
Preeti U Murthy8651f972012-07-09 10:12:56 +0200[diff] [blame]180static inline void cpuidle_pause(void) { }
181static inline void cpuidle_resume(void) { }
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]182static inline int cpuidle_enable_device(struct cpuidle_device *dev)
Len Brown6b2c6762010-05-11 16:50:52 -0400[diff] [blame]183{return -ENODEV; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]184static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
Boris Ostrovsky1a022e32012-03-13 19:55:09 +0100[diff] [blame]185static inline int cpuidle_play_dead(void) {return -ENODEV; }
Rafael J. Wysocki38106312015-02-12 23:33:15 +0100[diff] [blame]186static inline void cpuidle_enter_freeze(void) { }
Daniel Lezcanoc8cc7d42014-03-03 08:48:52 +0100[diff] [blame]187static inline struct cpuidle_driver *cpuidle_get_cpu_driver(
188 struct cpuidle_device *dev) {return NULL; }
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]189#endif
190
Colin Cross20ff51a2012-05-07 17:57:42 -0700[diff] [blame]191#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
192void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a);
Arnd Bergmannc7a9b092012-08-15 20:51:54 +0000[diff] [blame]193#else
194static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a)
195{
196}
Colin Cross20ff51a2012-05-07 17:57:42 -0700[diff] [blame]197#endif
198
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]199/******************************
200 * CPUIDLE GOVERNOR INTERFACE *
201 ******************************/
202
203struct cpuidle_governor {
204 char name[CPUIDLE_NAME_LEN];
205 struct list_head governor_list;
206 unsigned int rating;
207
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530[diff] [blame]208 int (*enable) (struct cpuidle_driver *drv,
209 struct cpuidle_device *dev);
210 void (*disable) (struct cpuidle_driver *drv,
211 struct cpuidle_device *dev);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]212
Deepthi Dharwar46bcfad2011-10-28 16:20:42 +0530[diff] [blame]213 int (*select) (struct cpuidle_driver *drv,
214 struct cpuidle_device *dev);
Deepthi Dharware978aa72011-10-28 16:20:09 +0530[diff] [blame]215 void (*reflect) (struct cpuidle_device *dev, int index);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]216
217 struct module *owner;
218};
219
220#ifdef CONFIG_CPU_IDLE
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]221extern int cpuidle_register_governor(struct cpuidle_governor *gov);
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]222#else
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]223static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
224{return 0;}
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]225#endif
226
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800[diff] [blame]227#ifdef CONFIG_ARCH_HAS_CPU_RELAX
228#define CPUIDLE_DRIVER_STATE_START 1
229#else
230#define CPUIDLE_DRIVER_STATE_START 0
231#endif
232
Len Brown4f86d3a2007-10-03 18:58:00 -0400[diff] [blame]233#endif /* _LINUX_CPUIDLE_H */