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[linux.git] / include / linux / pm_qos.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PM_QOS_H
3 #define _LINUX_PM_QOS_H
4 /* interface for the pm_qos_power infrastructure of the linux kernel.
5  *
6  * Mark Gross <mgross@linux.intel.com>
7  */
8 #include <linux/plist.h>
9 #include <linux/notifier.h>
10 #include <linux/device.h>
11 #include <linux/workqueue.h>
12
13 enum {
14         PM_QOS_RESERVED = 0,
15         PM_QOS_CPU_DMA_LATENCY,
16
17         /* insert new class ID */
18         PM_QOS_NUM_CLASSES,
19 };
20
21 enum pm_qos_flags_status {
22         PM_QOS_FLAGS_UNDEFINED = -1,
23         PM_QOS_FLAGS_NONE,
24         PM_QOS_FLAGS_SOME,
25         PM_QOS_FLAGS_ALL,
26 };
27
28 #define PM_QOS_DEFAULT_VALUE    (-1)
29 #define PM_QOS_LATENCY_ANY      S32_MAX
30 #define PM_QOS_LATENCY_ANY_NS   ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)
31
32 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
33 #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE     PM_QOS_LATENCY_ANY
34 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT     PM_QOS_LATENCY_ANY
35 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS  PM_QOS_LATENCY_ANY_NS
36 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE  0
37 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT  (-1)
38
39 #define PM_QOS_FLAG_NO_POWER_OFF        (1 << 0)
40
41 struct pm_qos_request {
42         struct plist_node node;
43         int pm_qos_class;
44         struct delayed_work work; /* for pm_qos_update_request_timeout */
45 };
46
47 struct pm_qos_flags_request {
48         struct list_head node;
49         s32 flags;      /* Do not change to 64 bit */
50 };
51
52 enum dev_pm_qos_req_type {
53         DEV_PM_QOS_RESUME_LATENCY = 1,
54         DEV_PM_QOS_LATENCY_TOLERANCE,
55         DEV_PM_QOS_FLAGS,
56 };
57
58 struct dev_pm_qos_request {
59         enum dev_pm_qos_req_type type;
60         union {
61                 struct plist_node pnode;
62                 struct pm_qos_flags_request flr;
63         } data;
64         struct device *dev;
65 };
66
67 enum pm_qos_type {
68         PM_QOS_UNITIALIZED,
69         PM_QOS_MAX,             /* return the largest value */
70         PM_QOS_MIN,             /* return the smallest value */
71         PM_QOS_SUM              /* return the sum */
72 };
73
74 /*
75  * Note: The lockless read path depends on the CPU accessing target_value
76  * or effective_flags atomically.  Atomic access is only guaranteed on all CPU
77  * types linux supports for 32 bit quantites
78  */
79 struct pm_qos_constraints {
80         struct plist_head list;
81         s32 target_value;       /* Do not change to 64 bit */
82         s32 default_value;
83         s32 no_constraint_value;
84         enum pm_qos_type type;
85         struct blocking_notifier_head *notifiers;
86 };
87
88 struct pm_qos_flags {
89         struct list_head list;
90         s32 effective_flags;    /* Do not change to 64 bit */
91 };
92
93 struct dev_pm_qos {
94         struct pm_qos_constraints resume_latency;
95         struct pm_qos_constraints latency_tolerance;
96         struct pm_qos_flags flags;
97         struct dev_pm_qos_request *resume_latency_req;
98         struct dev_pm_qos_request *latency_tolerance_req;
99         struct dev_pm_qos_request *flags_req;
100 };
101
102 /* Action requested to pm_qos_update_target */
103 enum pm_qos_req_action {
104         PM_QOS_ADD_REQ,         /* Add a new request */
105         PM_QOS_UPDATE_REQ,      /* Update an existing request */
106         PM_QOS_REMOVE_REQ       /* Remove an existing request */
107 };
108
109 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
110 {
111         return req->dev != NULL;
112 }
113
114 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
115                          enum pm_qos_req_action action, int value);
116 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
117                          struct pm_qos_flags_request *req,
118                          enum pm_qos_req_action action, s32 val);
119 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
120                         s32 value);
121 void pm_qos_update_request(struct pm_qos_request *req,
122                            s32 new_value);
123 void pm_qos_update_request_timeout(struct pm_qos_request *req,
124                                    s32 new_value, unsigned long timeout_us);
125 void pm_qos_remove_request(struct pm_qos_request *req);
126
127 int pm_qos_request(int pm_qos_class);
128 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
129 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
130 int pm_qos_request_active(struct pm_qos_request *req);
131 s32 pm_qos_read_value(struct pm_qos_constraints *c);
132
133 #ifdef CONFIG_PM
134 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
135 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
136 s32 __dev_pm_qos_resume_latency(struct device *dev);
137 s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type);
138 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
139                            enum dev_pm_qos_req_type type, s32 value);
140 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
141 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
142 int dev_pm_qos_add_notifier(struct device *dev,
143                             struct notifier_block *notifier,
144                             enum dev_pm_qos_req_type type);
145 int dev_pm_qos_remove_notifier(struct device *dev,
146                                struct notifier_block *notifier,
147                                enum dev_pm_qos_req_type type);
148 void dev_pm_qos_constraints_init(struct device *dev);
149 void dev_pm_qos_constraints_destroy(struct device *dev);
150 int dev_pm_qos_add_ancestor_request(struct device *dev,
151                                     struct dev_pm_qos_request *req,
152                                     enum dev_pm_qos_req_type type, s32 value);
153 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
154 void dev_pm_qos_hide_latency_limit(struct device *dev);
155 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
156 void dev_pm_qos_hide_flags(struct device *dev);
157 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
158 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
159 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
160 int dev_pm_qos_expose_latency_tolerance(struct device *dev);
161 void dev_pm_qos_hide_latency_tolerance(struct device *dev);
162
163 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
164 {
165         return dev->power.qos->resume_latency_req->data.pnode.prio;
166 }
167
168 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
169 {
170         return dev->power.qos->flags_req->data.flr.flags;
171 }
172
173 static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
174 {
175         return IS_ERR_OR_NULL(dev->power.qos) ?
176                 PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
177                 pm_qos_read_value(&dev->power.qos->resume_latency);
178 }
179 #else
180 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
181                                                           s32 mask)
182                         { return PM_QOS_FLAGS_UNDEFINED; }
183 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
184                                                         s32 mask)
185                         { return PM_QOS_FLAGS_UNDEFINED; }
186 static inline s32 __dev_pm_qos_resume_latency(struct device *dev)
187                         { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
188 static inline s32 dev_pm_qos_read_value(struct device *dev,
189                                         enum dev_pm_qos_req_type type)
190 {
191         switch (type) {
192         case DEV_PM_QOS_RESUME_LATENCY:
193                 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
194         default:
195                 WARN_ON(1);
196                 return 0;
197         }
198 }
199
200 static inline int dev_pm_qos_add_request(struct device *dev,
201                                          struct dev_pm_qos_request *req,
202                                          enum dev_pm_qos_req_type type,
203                                          s32 value)
204                         { return 0; }
205 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
206                                             s32 new_value)
207                         { return 0; }
208 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
209                         { return 0; }
210 static inline int dev_pm_qos_add_notifier(struct device *dev,
211                                           struct notifier_block *notifier,
212                                           enum dev_pm_qos_req_type type)
213                         { return 0; }
214 static inline int dev_pm_qos_remove_notifier(struct device *dev,
215                                              struct notifier_block *notifier,
216                                              enum dev_pm_qos_req_type type)
217                         { return 0; }
218 static inline void dev_pm_qos_constraints_init(struct device *dev)
219 {
220         dev->power.power_state = PMSG_ON;
221 }
222 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
223 {
224         dev->power.power_state = PMSG_INVALID;
225 }
226 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
227                                                   struct dev_pm_qos_request *req,
228                                                   enum dev_pm_qos_req_type type,
229                                                   s32 value)
230                         { return 0; }
231 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
232                         { return 0; }
233 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
234 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
235                         { return 0; }
236 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
237 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
238                         { return 0; }
239 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
240                         { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
241 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
242                         { return 0; }
243 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
244                         { return 0; }
245 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
246
247 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
248 {
249         return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
250 }
251 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
252 static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
253 {
254         return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
255 }
256 #endif
257
258 #define FREQ_QOS_MIN_DEFAULT_VALUE      0
259 #define FREQ_QOS_MAX_DEFAULT_VALUE      (-1)
260
261 enum freq_qos_req_type {
262         FREQ_QOS_MIN = 1,
263         FREQ_QOS_MAX,
264 };
265
266 struct freq_constraints {
267         struct pm_qos_constraints min_freq;
268         struct blocking_notifier_head min_freq_notifiers;
269         struct pm_qos_constraints max_freq;
270         struct blocking_notifier_head max_freq_notifiers;
271 };
272
273 struct freq_qos_request {
274         enum freq_qos_req_type type;
275         struct plist_node pnode;
276         struct freq_constraints *qos;
277 };
278
279 static inline int freq_qos_request_active(struct freq_qos_request *req)
280 {
281         return !IS_ERR_OR_NULL(req->qos);
282 }
283
284 void freq_constraints_init(struct freq_constraints *qos);
285
286 s32 freq_qos_read_value(struct freq_constraints *qos,
287                         enum freq_qos_req_type type);
288
289 int freq_qos_add_request(struct freq_constraints *qos,
290                          struct freq_qos_request *req,
291                          enum freq_qos_req_type type, s32 value);
292 int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
293 int freq_qos_remove_request(struct freq_qos_request *req);
294
295 int freq_qos_add_notifier(struct freq_constraints *qos,
296                           enum freq_qos_req_type type,
297                           struct notifier_block *notifier);
298 int freq_qos_remove_notifier(struct freq_constraints *qos,
299                              enum freq_qos_req_type type,
300                              struct notifier_block *notifier);
301
302 #endif