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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> | |
16 | #include <linux/module.h> | |
17 | #include <linux/kobject.h> | |
18 | #include <linux/completion.h> | |
19 | ||
20 | #define CPUIDLE_STATE_MAX 8 | |
21 | #define CPUIDLE_NAME_LEN 16 | |
22 | ||
23 | struct cpuidle_device; | |
24 | ||
25 | ||
26 | /**************************** | |
27 | * CPUIDLE DEVICE INTERFACE * | |
28 | ****************************/ | |
29 | ||
30 | struct cpuidle_state { | |
31 | char name[CPUIDLE_NAME_LEN]; | |
32 | void *driver_data; | |
33 | ||
34 | unsigned int flags; | |
35 | unsigned int exit_latency; /* in US */ | |
36 | unsigned int power_usage; /* in mW */ | |
37 | unsigned int target_residency; /* in US */ | |
38 | ||
39 | unsigned int usage; | |
40 | unsigned int time; /* in US */ | |
41 | ||
42 | int (*enter) (struct cpuidle_device *dev, | |
43 | struct cpuidle_state *state); | |
44 | }; | |
45 | ||
46 | /* Idle State Flags */ | |
47 | #define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */ | |
48 | #define CPUIDLE_FLAG_CHECK_BM (0x02) /* BM activity will exit state */ | |
49 | #define CPUIDLE_FLAG_SHALLOW (0x10) /* low latency, minimal savings */ | |
50 | #define CPUIDLE_FLAG_BALANCED (0x20) /* medium latency, moderate savings */ | |
51 | #define CPUIDLE_FLAG_DEEP (0x40) /* high latency, large savings */ | |
52 | ||
53 | #define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000) | |
54 | ||
55 | /** | |
56 | * cpuidle_get_statedata - retrieves private driver state data | |
57 | * @state: the state | |
58 | */ | |
59 | static inline void * cpuidle_get_statedata(struct cpuidle_state *state) | |
60 | { | |
61 | return state->driver_data; | |
62 | } | |
63 | ||
64 | /** | |
65 | * cpuidle_set_statedata - stores private driver state data | |
66 | * @state: the state | |
67 | * @data: the private data | |
68 | */ | |
69 | static inline void | |
70 | cpuidle_set_statedata(struct cpuidle_state *state, void *data) | |
71 | { | |
72 | state->driver_data = data; | |
73 | } | |
74 | ||
75 | struct cpuidle_state_kobj { | |
76 | struct cpuidle_state *state; | |
77 | struct completion kobj_unregister; | |
78 | struct kobject kobj; | |
79 | }; | |
80 | ||
81 | struct cpuidle_device { | |
b5556a67 | 82 | unsigned int enabled:1; |
4f86d3a8 LB |
83 | unsigned int cpu; |
84 | ||
85 | int last_residency; | |
86 | int state_count; | |
87 | struct cpuidle_state states[CPUIDLE_STATE_MAX]; | |
88 | struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; | |
89 | struct cpuidle_state *last_state; | |
90 | ||
91 | struct list_head device_list; | |
92 | struct kobject kobj; | |
93 | struct completion kobj_unregister; | |
94 | void *governor_data; | |
ddc081a1 | 95 | struct cpuidle_state *safe_state; |
4f86d3a8 LB |
96 | }; |
97 | ||
98 | DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices); | |
99 | ||
100 | /** | |
101 | * cpuidle_get_last_residency - retrieves the last state's residency time | |
102 | * @dev: the target CPU | |
103 | * | |
104 | * NOTE: this value is invalid if CPUIDLE_FLAG_TIME_VALID isn't set | |
105 | */ | |
106 | static inline int cpuidle_get_last_residency(struct cpuidle_device *dev) | |
107 | { | |
108 | return dev->last_residency; | |
109 | } | |
110 | ||
111 | ||
112 | /**************************** | |
113 | * CPUIDLE DRIVER INTERFACE * | |
114 | ****************************/ | |
115 | ||
116 | struct cpuidle_driver { | |
117 | char name[CPUIDLE_NAME_LEN]; | |
118 | struct module *owner; | |
119 | }; | |
120 | ||
121 | #ifdef CONFIG_CPU_IDLE | |
122 | ||
123 | extern int cpuidle_register_driver(struct cpuidle_driver *drv); | |
124 | extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); | |
125 | extern int cpuidle_register_device(struct cpuidle_device *dev); | |
126 | extern void cpuidle_unregister_device(struct cpuidle_device *dev); | |
127 | ||
128 | extern void cpuidle_pause_and_lock(void); | |
129 | extern void cpuidle_resume_and_unlock(void); | |
130 | extern int cpuidle_enable_device(struct cpuidle_device *dev); | |
131 | extern void cpuidle_disable_device(struct cpuidle_device *dev); | |
132 | ||
133 | #else | |
134 | ||
135 | static inline int cpuidle_register_driver(struct cpuidle_driver *drv) | |
136 | {return 0;} | |
137 | static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } | |
138 | static inline int cpuidle_register_device(struct cpuidle_device *dev) | |
139 | {return 0;} | |
140 | static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { } | |
141 | ||
142 | static inline void cpuidle_pause_and_lock(void) { } | |
143 | static inline void cpuidle_resume_and_unlock(void) { } | |
144 | static inline int cpuidle_enable_device(struct cpuidle_device *dev) | |
145 | {return 0;} | |
146 | static inline void cpuidle_disable_device(struct cpuidle_device *dev) { } | |
147 | ||
148 | #endif | |
149 | ||
150 | /****************************** | |
151 | * CPUIDLE GOVERNOR INTERFACE * | |
152 | ******************************/ | |
153 | ||
154 | struct cpuidle_governor { | |
155 | char name[CPUIDLE_NAME_LEN]; | |
156 | struct list_head governor_list; | |
157 | unsigned int rating; | |
158 | ||
159 | int (*enable) (struct cpuidle_device *dev); | |
160 | void (*disable) (struct cpuidle_device *dev); | |
161 | ||
162 | int (*select) (struct cpuidle_device *dev); | |
163 | void (*reflect) (struct cpuidle_device *dev); | |
164 | ||
165 | struct module *owner; | |
166 | }; | |
167 | ||
168 | #ifdef CONFIG_CPU_IDLE | |
169 | ||
170 | extern int cpuidle_register_governor(struct cpuidle_governor *gov); | |
171 | extern void cpuidle_unregister_governor(struct cpuidle_governor *gov); | |
172 | ||
173 | #else | |
174 | ||
175 | static inline int cpuidle_register_governor(struct cpuidle_governor *gov) | |
176 | {return 0;} | |
177 | static inline void cpuidle_unregister_governor(struct cpuidle_governor *gov) { } | |
178 | ||
179 | #endif | |
180 | ||
181 | #endif /* _LINUX_CPUIDLE_H */ |