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4f86d3a8 LB |
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> | |
4f86d3a8 LB |
16 | #include <linux/kobject.h> |
17 | #include <linux/completion.h> | |
e1689795 | 18 | #include <linux/hrtimer.h> |
4f86d3a8 LB |
19 | |
20 | #define CPUIDLE_STATE_MAX 8 | |
21 | #define CPUIDLE_NAME_LEN 16 | |
4fcb2fcd | 22 | #define CPUIDLE_DESC_LEN 32 |
4f86d3a8 | 23 | |
de477254 PG |
24 | struct module; |
25 | ||
4f86d3a8 | 26 | struct cpuidle_device; |
46bcfad7 | 27 | struct cpuidle_driver; |
4f86d3a8 LB |
28 | |
29 | ||
30 | /**************************** | |
31 | * CPUIDLE DEVICE INTERFACE * | |
32 | ****************************/ | |
33 | ||
4202735e DD |
34 | struct cpuidle_state_usage { |
35 | void *driver_data; | |
36 | ||
37 | unsigned long long usage; | |
38 | unsigned long long time; /* in US */ | |
39 | }; | |
40 | ||
4f86d3a8 LB |
41 | struct cpuidle_state { |
42 | char name[CPUIDLE_NAME_LEN]; | |
4fcb2fcd | 43 | char desc[CPUIDLE_DESC_LEN]; |
4f86d3a8 LB |
44 | |
45 | unsigned int flags; | |
46 | unsigned int exit_latency; /* in US */ | |
47 | unsigned int power_usage; /* in mW */ | |
48 | unsigned int target_residency; /* in US */ | |
3a53396b | 49 | unsigned int disable; |
4f86d3a8 | 50 | |
4f86d3a8 | 51 | int (*enter) (struct cpuidle_device *dev, |
46bcfad7 | 52 | struct cpuidle_driver *drv, |
e978aa7d | 53 | int index); |
4f86d3a8 LB |
54 | }; |
55 | ||
56 | /* Idle State Flags */ | |
57 | #define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */ | |
4f86d3a8 LB |
58 | |
59 | #define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000) | |
60 | ||
61 | /** | |
62 | * cpuidle_get_statedata - retrieves private driver state data | |
4202735e | 63 | * @st_usage: the state usage statistics |
4f86d3a8 | 64 | */ |
4202735e | 65 | static inline void *cpuidle_get_statedata(struct cpuidle_state_usage *st_usage) |
4f86d3a8 | 66 | { |
4202735e | 67 | return st_usage->driver_data; |
4f86d3a8 LB |
68 | } |
69 | ||
70 | /** | |
71 | * cpuidle_set_statedata - stores private driver state data | |
4202735e | 72 | * @st_usage: the state usage statistics |
4f86d3a8 LB |
73 | * @data: the private data |
74 | */ | |
75 | static inline void | |
4202735e | 76 | cpuidle_set_statedata(struct cpuidle_state_usage *st_usage, void *data) |
4f86d3a8 | 77 | { |
4202735e | 78 | st_usage->driver_data = data; |
4f86d3a8 LB |
79 | } |
80 | ||
81 | struct cpuidle_state_kobj { | |
82 | struct cpuidle_state *state; | |
4202735e | 83 | struct cpuidle_state_usage *state_usage; |
4f86d3a8 LB |
84 | struct completion kobj_unregister; |
85 | struct kobject kobj; | |
86 | }; | |
87 | ||
88 | struct cpuidle_device { | |
dcb84f33 | 89 | unsigned int registered:1; |
b5556a67 | 90 | unsigned int enabled:1; |
4f86d3a8 LB |
91 | unsigned int cpu; |
92 | ||
93 | int last_residency; | |
94 | int state_count; | |
4202735e | 95 | struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; |
4f86d3a8 | 96 | struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; |
4f86d3a8 LB |
97 | |
98 | struct list_head device_list; | |
99 | struct kobject kobj; | |
100 | struct completion kobj_unregister; | |
4f86d3a8 LB |
101 | }; |
102 | ||
103 | DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices); | |
104 | ||
105 | /** | |
106 | * cpuidle_get_last_residency - retrieves the last state's residency time | |
107 | * @dev: the target CPU | |
108 | * | |
109 | * NOTE: this value is invalid if CPUIDLE_FLAG_TIME_VALID isn't set | |
110 | */ | |
111 | static inline int cpuidle_get_last_residency(struct cpuidle_device *dev) | |
112 | { | |
113 | return dev->last_residency; | |
114 | } | |
115 | ||
116 | ||
117 | /**************************** | |
118 | * CPUIDLE DRIVER INTERFACE * | |
119 | ****************************/ | |
120 | ||
121 | struct cpuidle_driver { | |
db70b044 | 122 | const char *name; |
4f86d3a8 | 123 | struct module *owner; |
46bcfad7 DD |
124 | |
125 | unsigned int power_specified:1; | |
e1689795 RL |
126 | /* set to 1 to use the core cpuidle time keeping (for all states). */ |
127 | unsigned int en_core_tk_irqen:1; | |
46bcfad7 DD |
128 | struct cpuidle_state states[CPUIDLE_STATE_MAX]; |
129 | int state_count; | |
130 | int safe_state_index; | |
4f86d3a8 LB |
131 | }; |
132 | ||
133 | #ifdef CONFIG_CPU_IDLE | |
d91ee586 | 134 | extern void disable_cpuidle(void); |
a0bfa137 | 135 | extern int cpuidle_idle_call(void); |
4f86d3a8 | 136 | extern int cpuidle_register_driver(struct cpuidle_driver *drv); |
752138df | 137 | struct cpuidle_driver *cpuidle_get_driver(void); |
4f86d3a8 LB |
138 | extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); |
139 | extern int cpuidle_register_device(struct cpuidle_device *dev); | |
140 | extern void cpuidle_unregister_device(struct cpuidle_device *dev); | |
141 | ||
142 | extern void cpuidle_pause_and_lock(void); | |
143 | extern void cpuidle_resume_and_unlock(void); | |
144 | extern int cpuidle_enable_device(struct cpuidle_device *dev); | |
145 | extern void cpuidle_disable_device(struct cpuidle_device *dev); | |
e1689795 RL |
146 | extern int cpuidle_wrap_enter(struct cpuidle_device *dev, |
147 | struct cpuidle_driver *drv, int index, | |
148 | int (*enter)(struct cpuidle_device *dev, | |
149 | struct cpuidle_driver *drv, int index)); | |
4f86d3a8 | 150 | #else |
d91ee586 | 151 | static inline void disable_cpuidle(void) { } |
a0bfa137 | 152 | static inline int cpuidle_idle_call(void) { return -ENODEV; } |
4f86d3a8 | 153 | static inline int cpuidle_register_driver(struct cpuidle_driver *drv) |
6b2c676b | 154 | {return -ENODEV; } |
752138df | 155 | static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } |
4f86d3a8 LB |
156 | static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } |
157 | static inline int cpuidle_register_device(struct cpuidle_device *dev) | |
6b2c676b | 158 | {return -ENODEV; } |
4f86d3a8 LB |
159 | static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { } |
160 | ||
161 | static inline void cpuidle_pause_and_lock(void) { } | |
162 | static inline void cpuidle_resume_and_unlock(void) { } | |
163 | static inline int cpuidle_enable_device(struct cpuidle_device *dev) | |
6b2c676b | 164 | {return -ENODEV; } |
4f86d3a8 | 165 | static inline void cpuidle_disable_device(struct cpuidle_device *dev) { } |
e1689795 RL |
166 | static inline int cpuidle_wrap_enter(struct cpuidle_device *dev, |
167 | struct cpuidle_driver *drv, int index, | |
168 | int (*enter)(struct cpuidle_device *dev, | |
169 | struct cpuidle_driver *drv, int index)) | |
170 | { return -ENODEV; } | |
4f86d3a8 LB |
171 | |
172 | #endif | |
173 | ||
174 | /****************************** | |
175 | * CPUIDLE GOVERNOR INTERFACE * | |
176 | ******************************/ | |
177 | ||
178 | struct cpuidle_governor { | |
179 | char name[CPUIDLE_NAME_LEN]; | |
180 | struct list_head governor_list; | |
181 | unsigned int rating; | |
182 | ||
46bcfad7 DD |
183 | int (*enable) (struct cpuidle_driver *drv, |
184 | struct cpuidle_device *dev); | |
185 | void (*disable) (struct cpuidle_driver *drv, | |
186 | struct cpuidle_device *dev); | |
4f86d3a8 | 187 | |
46bcfad7 DD |
188 | int (*select) (struct cpuidle_driver *drv, |
189 | struct cpuidle_device *dev); | |
e978aa7d | 190 | void (*reflect) (struct cpuidle_device *dev, int index); |
4f86d3a8 LB |
191 | |
192 | struct module *owner; | |
193 | }; | |
194 | ||
195 | #ifdef CONFIG_CPU_IDLE | |
196 | ||
197 | extern int cpuidle_register_governor(struct cpuidle_governor *gov); | |
198 | extern void cpuidle_unregister_governor(struct cpuidle_governor *gov); | |
199 | ||
65b7f839 TR |
200 | #ifdef CONFIG_INTEL_IDLE |
201 | extern int intel_idle_cpu_init(int cpu); | |
4f86d3a8 | 202 | #else |
65b7f839 TR |
203 | static inline int intel_idle_cpu_init(int cpu) { return -1; } |
204 | #endif | |
205 | ||
206 | #else | |
207 | static inline int intel_idle_cpu_init(int cpu) { return -1; } | |
4f86d3a8 LB |
208 | |
209 | static inline int cpuidle_register_governor(struct cpuidle_governor *gov) | |
210 | {return 0;} | |
211 | static inline void cpuidle_unregister_governor(struct cpuidle_governor *gov) { } | |
212 | ||
213 | #endif | |
214 | ||
9a0b8415 | 215 | #ifdef CONFIG_ARCH_HAS_CPU_RELAX |
216 | #define CPUIDLE_DRIVER_STATE_START 1 | |
217 | #else | |
218 | #define CPUIDLE_DRIVER_STATE_START 0 | |
219 | #endif | |
220 | ||
4f86d3a8 | 221 | #endif /* _LINUX_CPUIDLE_H */ |