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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 */ | |
9db1d644 | 65 | #define CPUIDLE_FLAG_NONE (0x00) |
4126c019 | 66 | #define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */ |
b60e6a0e | 67 | #define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */ |
4f86d3a8 LB |
68 | |
69 | #define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000) | |
70 | ||
728ce22b | 71 | struct cpuidle_device_kobj; |
1a706438 DL |
72 | struct cpuidle_state_kobj; |
73 | struct cpuidle_driver_kobj; | |
728ce22b | 74 | |
4f86d3a8 | 75 | struct cpuidle_device { |
dcb84f33 | 76 | unsigned int registered:1; |
b5556a67 | 77 | unsigned int enabled:1; |
bb8313b6 | 78 | unsigned int use_deepest_state:1; |
4f86d3a8 LB |
79 | unsigned int cpu; |
80 | ||
81 | int last_residency; | |
4202735e | 82 | struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; |
4f86d3a8 | 83 | struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; |
bf4d1b5d | 84 | struct cpuidle_driver_kobj *kobj_driver; |
728ce22b | 85 | struct cpuidle_device_kobj *kobj_dev; |
4f86d3a8 | 86 | struct list_head device_list; |
4126c019 CC |
87 | |
88 | #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED | |
4126c019 CC |
89 | cpumask_t coupled_cpus; |
90 | struct cpuidle_coupled *coupled; | |
91 | #endif | |
4f86d3a8 LB |
92 | }; |
93 | ||
94 | DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices); | |
f08dbf8a | 95 | DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev); |
4f86d3a8 LB |
96 | |
97 | /** | |
98 | * cpuidle_get_last_residency - retrieves the last state's residency time | |
99 | * @dev: the target CPU | |
4f86d3a8 LB |
100 | */ |
101 | static 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 | ||
111 | struct cpuidle_driver { | |
db70b044 | 112 | const char *name; |
4f86d3a8 | 113 | struct module *owner; |
42f67f2a | 114 | int refcnt; |
46bcfad7 | 115 | |
a06df062 DL |
116 | /* used by the cpuidle framework to setup the broadcast timer */ |
117 | unsigned int bctimer:1; | |
8aef33a7 | 118 | /* states array must be ordered in decreasing power consumption */ |
46bcfad7 DD |
119 | struct cpuidle_state states[CPUIDLE_STATE_MAX]; |
120 | int state_count; | |
121 | int safe_state_index; | |
82467a5a DL |
122 | |
123 | /* the driver handles the cpus in cpumask */ | |
6587fca2 | 124 | struct cpumask *cpumask; |
4f86d3a8 LB |
125 | }; |
126 | ||
127 | #ifdef CONFIG_CPU_IDLE | |
d91ee586 | 128 | extern void disable_cpuidle(void); |
ef2b22ac RW |
129 | extern bool cpuidle_not_available(struct cpuidle_driver *drv, |
130 | struct cpuidle_device *dev); | |
907e30f1 | 131 | |
907e30f1 DL |
132 | extern int cpuidle_select(struct cpuidle_driver *drv, |
133 | struct cpuidle_device *dev); | |
134 | extern int cpuidle_enter(struct cpuidle_driver *drv, | |
135 | struct cpuidle_device *dev, int index); | |
136 | extern void cpuidle_reflect(struct cpuidle_device *dev, int index); | |
137 | ||
4f86d3a8 | 138 | extern int cpuidle_register_driver(struct cpuidle_driver *drv); |
6e797a07 RW |
139 | extern struct cpuidle_driver *cpuidle_get_driver(void); |
140 | extern struct cpuidle_driver *cpuidle_driver_ref(void); | |
141 | extern void cpuidle_driver_unref(void); | |
4f86d3a8 LB |
142 | extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); |
143 | extern int cpuidle_register_device(struct cpuidle_device *dev); | |
144 | extern void cpuidle_unregister_device(struct cpuidle_device *dev); | |
4c637b21 DL |
145 | extern int cpuidle_register(struct cpuidle_driver *drv, |
146 | const struct cpumask *const coupled_cpus); | |
147 | extern void cpuidle_unregister(struct cpuidle_driver *drv); | |
4f86d3a8 LB |
148 | extern void cpuidle_pause_and_lock(void); |
149 | extern void cpuidle_resume_and_unlock(void); | |
8651f97b PM |
150 | extern void cpuidle_pause(void); |
151 | extern void cpuidle_resume(void); | |
4f86d3a8 LB |
152 | extern int cpuidle_enable_device(struct cpuidle_device *dev); |
153 | extern void cpuidle_disable_device(struct cpuidle_device *dev); | |
1a022e3f BO |
154 | extern int cpuidle_play_dead(void); |
155 | ||
bf4d1b5d | 156 | extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev); |
9bd616e3 CM |
157 | static inline struct cpuidle_device *cpuidle_get_device(void) |
158 | {return __this_cpu_read(cpuidle_devices); } | |
4f86d3a8 | 159 | #else |
d91ee586 | 160 | static inline void disable_cpuidle(void) { } |
ef2b22ac RW |
161 | static inline bool cpuidle_not_available(struct cpuidle_driver *drv, |
162 | struct cpuidle_device *dev) | |
163 | {return true; } | |
907e30f1 DL |
164 | static inline int cpuidle_select(struct cpuidle_driver *drv, |
165 | struct cpuidle_device *dev) | |
166 | {return -ENODEV; } | |
167 | static inline int cpuidle_enter(struct cpuidle_driver *drv, | |
168 | struct cpuidle_device *dev, int index) | |
169 | {return -ENODEV; } | |
170 | static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { } | |
4f86d3a8 | 171 | static inline int cpuidle_register_driver(struct cpuidle_driver *drv) |
6b2c676b | 172 | {return -ENODEV; } |
752138df | 173 | static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } |
6e797a07 RW |
174 | static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; } |
175 | static inline void cpuidle_driver_unref(void) {} | |
4f86d3a8 LB |
176 | static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } |
177 | static inline int cpuidle_register_device(struct cpuidle_device *dev) | |
6b2c676b | 178 | {return -ENODEV; } |
4f86d3a8 | 179 | static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { } |
4c637b21 DL |
180 | static inline int cpuidle_register(struct cpuidle_driver *drv, |
181 | const struct cpumask *const coupled_cpus) | |
182 | {return -ENODEV; } | |
183 | static inline void cpuidle_unregister(struct cpuidle_driver *drv) { } | |
4f86d3a8 LB |
184 | static inline void cpuidle_pause_and_lock(void) { } |
185 | static inline void cpuidle_resume_and_unlock(void) { } | |
8651f97b PM |
186 | static inline void cpuidle_pause(void) { } |
187 | static inline void cpuidle_resume(void) { } | |
4f86d3a8 | 188 | static inline int cpuidle_enable_device(struct cpuidle_device *dev) |
6b2c676b | 189 | {return -ENODEV; } |
4f86d3a8 | 190 | static inline void cpuidle_disable_device(struct cpuidle_device *dev) { } |
1a022e3f | 191 | static inline int cpuidle_play_dead(void) {return -ENODEV; } |
87e9b9f1 RW |
192 | static inline struct cpuidle_driver *cpuidle_get_cpu_driver( |
193 | struct cpuidle_device *dev) {return NULL; } | |
9bd616e3 | 194 | static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; } |
87e9b9f1 RW |
195 | #endif |
196 | ||
bb8313b6 | 197 | #ifdef CONFIG_CPU_IDLE |
87e9b9f1 RW |
198 | extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv, |
199 | struct cpuidle_device *dev); | |
200 | extern int cpuidle_enter_freeze(struct cpuidle_driver *drv, | |
201 | struct cpuidle_device *dev); | |
bb8313b6 | 202 | extern void cpuidle_use_deepest_state(bool enable); |
87e9b9f1 | 203 | #else |
ef2b22ac RW |
204 | static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv, |
205 | struct cpuidle_device *dev) | |
206 | {return -ENODEV; } | |
207 | static inline int cpuidle_enter_freeze(struct cpuidle_driver *drv, | |
208 | struct cpuidle_device *dev) | |
209 | {return -ENODEV; } | |
bb8313b6 JP |
210 | static inline void cpuidle_use_deepest_state(bool enable) |
211 | { | |
212 | } | |
4f86d3a8 LB |
213 | #endif |
214 | ||
faad3849 RW |
215 | /* kernel/sched/idle.c */ |
216 | extern void sched_idle_set_state(struct cpuidle_state *idle_state); | |
827a5aef | 217 | extern void default_idle_call(void); |
faad3849 | 218 | |
20ff51a3 CC |
219 | #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED |
220 | void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a); | |
c7a9b09b AB |
221 | #else |
222 | static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a) | |
223 | { | |
224 | } | |
20ff51a3 CC |
225 | #endif |
226 | ||
4f86d3a8 LB |
227 | /****************************** |
228 | * CPUIDLE GOVERNOR INTERFACE * | |
229 | ******************************/ | |
230 | ||
231 | struct cpuidle_governor { | |
232 | char name[CPUIDLE_NAME_LEN]; | |
233 | struct list_head governor_list; | |
234 | unsigned int rating; | |
235 | ||
46bcfad7 DD |
236 | int (*enable) (struct cpuidle_driver *drv, |
237 | struct cpuidle_device *dev); | |
238 | void (*disable) (struct cpuidle_driver *drv, | |
239 | struct cpuidle_device *dev); | |
4f86d3a8 | 240 | |
46bcfad7 DD |
241 | int (*select) (struct cpuidle_driver *drv, |
242 | struct cpuidle_device *dev); | |
e978aa7d | 243 | void (*reflect) (struct cpuidle_device *dev, int index); |
4f86d3a8 LB |
244 | }; |
245 | ||
246 | #ifdef CONFIG_CPU_IDLE | |
4f86d3a8 | 247 | extern int cpuidle_register_governor(struct cpuidle_governor *gov); |
4f86d3a8 | 248 | #else |
4f86d3a8 LB |
249 | static inline int cpuidle_register_governor(struct cpuidle_governor *gov) |
250 | {return 0;} | |
4f86d3a8 LB |
251 | #endif |
252 | ||
9a0b8415 | 253 | #ifdef CONFIG_ARCH_HAS_CPU_RELAX |
254 | #define CPUIDLE_DRIVER_STATE_START 1 | |
255 | #else | |
256 | #define CPUIDLE_DRIVER_STATE_START 0 | |
257 | #endif | |
258 | ||
220276e0 SH |
259 | #define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \ |
260 | ({ \ | |
261 | int __ret; \ | |
262 | \ | |
263 | if (!idx) { \ | |
264 | cpu_do_idle(); \ | |
265 | return idx; \ | |
266 | } \ | |
267 | \ | |
268 | __ret = cpu_pm_enter(); \ | |
269 | if (!__ret) { \ | |
270 | __ret = low_level_idle_enter(idx); \ | |
271 | cpu_pm_exit(); \ | |
272 | } \ | |
273 | \ | |
274 | __ret ? -1 : idx; \ | |
275 | }) | |
276 | ||
4f86d3a8 | 277 | #endif /* _LINUX_CPUIDLE_H */ |