Commit | Line | Data |
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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> | |
e1689795 | 16 | #include <linux/hrtimer.h> |
4f86d3a8 | 17 | |
86239ceb | 18 | #define CPUIDLE_STATE_MAX 10 |
4f86d3a8 | 19 | #define CPUIDLE_NAME_LEN 16 |
4fcb2fcd | 20 | #define CPUIDLE_DESC_LEN 32 |
4f86d3a8 | 21 | |
de477254 PG |
22 | struct module; |
23 | ||
4f86d3a8 | 24 | struct cpuidle_device; |
46bcfad7 | 25 | struct cpuidle_driver; |
4f86d3a8 LB |
26 | |
27 | ||
28 | /**************************** | |
29 | * CPUIDLE DEVICE INTERFACE * | |
30 | ****************************/ | |
31 | ||
4202735e | 32 | struct cpuidle_state_usage { |
dc7fd275 | 33 | unsigned long long disable; |
4202735e DD |
34 | unsigned long long usage; |
35 | unsigned long long time; /* in US */ | |
36 | }; | |
37 | ||
4f86d3a8 LB |
38 | struct cpuidle_state { |
39 | char name[CPUIDLE_NAME_LEN]; | |
4fcb2fcd | 40 | char desc[CPUIDLE_DESC_LEN]; |
4f86d3a8 LB |
41 | |
42 | unsigned int flags; | |
43 | unsigned int exit_latency; /* in US */ | |
02401c06 | 44 | int power_usage; /* in mW */ |
4f86d3a8 | 45 | unsigned int target_residency; /* in US */ |
cbc9ef02 | 46 | bool disabled; /* disabled on all CPUs */ |
4f86d3a8 | 47 | |
4f86d3a8 | 48 | int (*enter) (struct cpuidle_device *dev, |
46bcfad7 | 49 | struct cpuidle_driver *drv, |
e978aa7d | 50 | int index); |
1a022e3f BO |
51 | |
52 | int (*enter_dead) (struct cpuidle_device *dev, int index); | |
124cf911 RW |
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); | |
4f86d3a8 LB |
62 | }; |
63 | ||
64 | /* Idle State Flags */ | |
4126c019 | 65 | #define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */ |
b60e6a0e | 66 | #define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */ |
4f86d3a8 LB |
67 | |
68 | #define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000) | |
69 | ||
728ce22b | 70 | struct cpuidle_device_kobj; |
1a706438 DL |
71 | struct cpuidle_state_kobj; |
72 | struct cpuidle_driver_kobj; | |
728ce22b | 73 | |
4f86d3a8 | 74 | struct cpuidle_device { |
dcb84f33 | 75 | unsigned int registered:1; |
b5556a67 | 76 | unsigned int enabled:1; |
4f86d3a8 LB |
77 | unsigned int cpu; |
78 | ||
79 | int last_residency; | |
4202735e | 80 | struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; |
4f86d3a8 | 81 | struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; |
bf4d1b5d | 82 | struct cpuidle_driver_kobj *kobj_driver; |
728ce22b | 83 | struct cpuidle_device_kobj *kobj_dev; |
4f86d3a8 | 84 | struct list_head device_list; |
4126c019 CC |
85 | |
86 | #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED | |
4126c019 CC |
87 | cpumask_t coupled_cpus; |
88 | struct cpuidle_coupled *coupled; | |
89 | #endif | |
4f86d3a8 LB |
90 | }; |
91 | ||
92 | DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices); | |
f08dbf8a | 93 | DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev); |
4f86d3a8 LB |
94 | |
95 | /** | |
96 | * cpuidle_get_last_residency - retrieves the last state's residency time | |
97 | * @dev: the target CPU | |
4f86d3a8 LB |
98 | */ |
99 | static inline int cpuidle_get_last_residency(struct cpuidle_device *dev) | |
100 | { | |
101 | return dev->last_residency; | |
102 | } | |
103 | ||
104 | ||
105 | /**************************** | |
106 | * CPUIDLE DRIVER INTERFACE * | |
107 | ****************************/ | |
108 | ||
109 | struct cpuidle_driver { | |
db70b044 | 110 | const char *name; |
4f86d3a8 | 111 | struct module *owner; |
42f67f2a | 112 | int refcnt; |
46bcfad7 | 113 | |
a06df062 DL |
114 | /* used by the cpuidle framework to setup the broadcast timer */ |
115 | unsigned int bctimer:1; | |
8aef33a7 | 116 | /* states array must be ordered in decreasing power consumption */ |
46bcfad7 DD |
117 | struct cpuidle_state states[CPUIDLE_STATE_MAX]; |
118 | int state_count; | |
119 | int safe_state_index; | |
82467a5a DL |
120 | |
121 | /* the driver handles the cpus in cpumask */ | |
6587fca2 | 122 | struct cpumask *cpumask; |
4f86d3a8 LB |
123 | }; |
124 | ||
125 | #ifdef CONFIG_CPU_IDLE | |
d91ee586 | 126 | extern void disable_cpuidle(void); |
ef2b22ac RW |
127 | extern bool cpuidle_not_available(struct cpuidle_driver *drv, |
128 | struct cpuidle_device *dev); | |
907e30f1 | 129 | |
907e30f1 DL |
130 | extern int cpuidle_select(struct cpuidle_driver *drv, |
131 | struct cpuidle_device *dev); | |
132 | extern int cpuidle_enter(struct cpuidle_driver *drv, | |
133 | struct cpuidle_device *dev, int index); | |
134 | extern void cpuidle_reflect(struct cpuidle_device *dev, int index); | |
135 | ||
4f86d3a8 | 136 | extern int cpuidle_register_driver(struct cpuidle_driver *drv); |
6e797a07 RW |
137 | extern struct cpuidle_driver *cpuidle_get_driver(void); |
138 | extern struct cpuidle_driver *cpuidle_driver_ref(void); | |
139 | extern void cpuidle_driver_unref(void); | |
4f86d3a8 LB |
140 | extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); |
141 | extern int cpuidle_register_device(struct cpuidle_device *dev); | |
142 | extern void cpuidle_unregister_device(struct cpuidle_device *dev); | |
4c637b21 DL |
143 | extern int cpuidle_register(struct cpuidle_driver *drv, |
144 | const struct cpumask *const coupled_cpus); | |
145 | extern void cpuidle_unregister(struct cpuidle_driver *drv); | |
4f86d3a8 LB |
146 | extern void cpuidle_pause_and_lock(void); |
147 | extern void cpuidle_resume_and_unlock(void); | |
8651f97b PM |
148 | extern void cpuidle_pause(void); |
149 | extern void cpuidle_resume(void); | |
4f86d3a8 LB |
150 | extern int cpuidle_enable_device(struct cpuidle_device *dev); |
151 | extern void cpuidle_disable_device(struct cpuidle_device *dev); | |
1a022e3f BO |
152 | extern int cpuidle_play_dead(void); |
153 | ||
bf4d1b5d | 154 | extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev); |
9bd616e3 CM |
155 | static inline struct cpuidle_device *cpuidle_get_device(void) |
156 | {return __this_cpu_read(cpuidle_devices); } | |
4f86d3a8 | 157 | #else |
d91ee586 | 158 | static inline void disable_cpuidle(void) { } |
ef2b22ac RW |
159 | static inline bool cpuidle_not_available(struct cpuidle_driver *drv, |
160 | struct cpuidle_device *dev) | |
161 | {return true; } | |
907e30f1 DL |
162 | static inline int cpuidle_select(struct cpuidle_driver *drv, |
163 | struct cpuidle_device *dev) | |
164 | {return -ENODEV; } | |
165 | static inline int cpuidle_enter(struct cpuidle_driver *drv, | |
166 | struct cpuidle_device *dev, int index) | |
167 | {return -ENODEV; } | |
168 | static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { } | |
4f86d3a8 | 169 | static inline int cpuidle_register_driver(struct cpuidle_driver *drv) |
6b2c676b | 170 | {return -ENODEV; } |
752138df | 171 | static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } |
6e797a07 RW |
172 | static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; } |
173 | static inline void cpuidle_driver_unref(void) {} | |
4f86d3a8 LB |
174 | static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } |
175 | static inline int cpuidle_register_device(struct cpuidle_device *dev) | |
6b2c676b | 176 | {return -ENODEV; } |
4f86d3a8 | 177 | static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { } |
4c637b21 DL |
178 | static inline int cpuidle_register(struct cpuidle_driver *drv, |
179 | const struct cpumask *const coupled_cpus) | |
180 | {return -ENODEV; } | |
181 | static inline void cpuidle_unregister(struct cpuidle_driver *drv) { } | |
4f86d3a8 LB |
182 | static inline void cpuidle_pause_and_lock(void) { } |
183 | static inline void cpuidle_resume_and_unlock(void) { } | |
8651f97b PM |
184 | static inline void cpuidle_pause(void) { } |
185 | static inline void cpuidle_resume(void) { } | |
4f86d3a8 | 186 | static inline int cpuidle_enable_device(struct cpuidle_device *dev) |
6b2c676b | 187 | {return -ENODEV; } |
4f86d3a8 | 188 | static inline void cpuidle_disable_device(struct cpuidle_device *dev) { } |
1a022e3f | 189 | static inline int cpuidle_play_dead(void) {return -ENODEV; } |
87e9b9f1 RW |
190 | static inline struct cpuidle_driver *cpuidle_get_cpu_driver( |
191 | struct cpuidle_device *dev) {return NULL; } | |
9bd616e3 | 192 | static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; } |
87e9b9f1 RW |
193 | #endif |
194 | ||
195 | #if defined(CONFIG_CPU_IDLE) && defined(CONFIG_SUSPEND) | |
196 | extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv, | |
197 | struct cpuidle_device *dev); | |
198 | extern int cpuidle_enter_freeze(struct cpuidle_driver *drv, | |
199 | struct cpuidle_device *dev); | |
200 | #else | |
ef2b22ac RW |
201 | static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv, |
202 | struct cpuidle_device *dev) | |
203 | {return -ENODEV; } | |
204 | static inline int cpuidle_enter_freeze(struct cpuidle_driver *drv, | |
205 | struct cpuidle_device *dev) | |
206 | {return -ENODEV; } | |
4f86d3a8 LB |
207 | #endif |
208 | ||
faad3849 RW |
209 | /* kernel/sched/idle.c */ |
210 | extern void sched_idle_set_state(struct cpuidle_state *idle_state); | |
827a5aef | 211 | extern void default_idle_call(void); |
faad3849 | 212 | |
20ff51a3 CC |
213 | #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED |
214 | void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a); | |
c7a9b09b AB |
215 | #else |
216 | static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a) | |
217 | { | |
218 | } | |
20ff51a3 CC |
219 | #endif |
220 | ||
4f86d3a8 LB |
221 | /****************************** |
222 | * CPUIDLE GOVERNOR INTERFACE * | |
223 | ******************************/ | |
224 | ||
225 | struct cpuidle_governor { | |
226 | char name[CPUIDLE_NAME_LEN]; | |
227 | struct list_head governor_list; | |
228 | unsigned int rating; | |
229 | ||
46bcfad7 DD |
230 | int (*enable) (struct cpuidle_driver *drv, |
231 | struct cpuidle_device *dev); | |
232 | void (*disable) (struct cpuidle_driver *drv, | |
233 | struct cpuidle_device *dev); | |
4f86d3a8 | 234 | |
46bcfad7 DD |
235 | int (*select) (struct cpuidle_driver *drv, |
236 | struct cpuidle_device *dev); | |
e978aa7d | 237 | void (*reflect) (struct cpuidle_device *dev, int index); |
4f86d3a8 LB |
238 | |
239 | struct module *owner; | |
240 | }; | |
241 | ||
242 | #ifdef CONFIG_CPU_IDLE | |
4f86d3a8 | 243 | extern int cpuidle_register_governor(struct cpuidle_governor *gov); |
4f86d3a8 | 244 | #else |
4f86d3a8 LB |
245 | static inline int cpuidle_register_governor(struct cpuidle_governor *gov) |
246 | {return 0;} | |
4f86d3a8 LB |
247 | #endif |
248 | ||
9a0b8415 | 249 | #ifdef CONFIG_ARCH_HAS_CPU_RELAX |
250 | #define CPUIDLE_DRIVER_STATE_START 1 | |
251 | #else | |
252 | #define CPUIDLE_DRIVER_STATE_START 0 | |
253 | #endif | |
254 | ||
220276e0 SH |
255 | #define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \ |
256 | ({ \ | |
257 | int __ret; \ | |
258 | \ | |
259 | if (!idx) { \ | |
260 | cpu_do_idle(); \ | |
261 | return idx; \ | |
262 | } \ | |
263 | \ | |
264 | __ret = cpu_pm_enter(); \ | |
265 | if (!__ret) { \ | |
266 | __ret = low_level_idle_enter(idx); \ | |
267 | cpu_pm_exit(); \ | |
268 | } \ | |
269 | \ | |
270 | __ret ? -1 : idx; \ | |
271 | }) | |
272 | ||
4f86d3a8 | 273 | #endif /* _LINUX_CPUIDLE_H */ |