1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Definitions related to Power Management Quality of Service (PM QoS).
4 *
5 * Copyright (C) 2020 Intel Corporation
6 *
7 * Authors:
8 * Mark Gross <mgross@linux.intel.com>
9 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 */
11
12 #ifndef _LINUX_PM_QOS_H
13 #define _LINUX_PM_QOS_H
14
15 #include <linux/plist.h>
16 #include <linux/notifier.h>
17 #include <linux/device.h>
18
19 enum pm_qos_flags_status {
20 PM_QOS_FLAGS_UNDEFINED = -1,
21 PM_QOS_FLAGS_NONE,
22 PM_QOS_FLAGS_SOME,
23 PM_QOS_FLAGS_ALL,
24 };
25
26 #define PM_QOS_DEFAULT_VALUE (-1)
27 #define PM_QOS_LATENCY_ANY S32_MAX
28 #define PM_QOS_LATENCY_ANY_NS ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)
29
30 #define PM_QOS_CPU_LATENCY_DEFAULT_VALUE (2000 * USEC_PER_SEC)
31 #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE PM_QOS_LATENCY_ANY
32 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY
33 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS PM_QOS_LATENCY_ANY_NS
34 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
35 #define PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE 0
36 #define PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE FREQ_QOS_MAX_DEFAULT_VALUE
37 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
38
39 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
40
41 enum pm_qos_type {
42 PM_QOS_UNITIALIZED,
43 PM_QOS_MAX, /* return the largest value */
44 PM_QOS_MIN, /* return the smallest value */
45 };
46
47 /*
48 * Note: The lockless read path depends on the CPU accessing target_value
49 * or effective_flags atomically. Atomic access is only guaranteed on all CPU
50 * types linux supports for 32 bit quantites
51 */
52 struct pm_qos_constraints {
53 struct plist_head list;
54 s32 target_value; /* Do not change to 64 bit */
55 s32 default_value;
56 s32 no_constraint_value;
57 enum pm_qos_type type;
58 struct blocking_notifier_head *notifiers;
59 };
60
61 struct pm_qos_request {
62 struct plist_node node;
63 struct pm_qos_constraints *qos;
64 };
65
66 struct pm_qos_flags_request {
67 struct list_head node;
68 s32 flags; /* Do not change to 64 bit */
69 };
70
71 struct pm_qos_flags {
72 struct list_head list;
73 s32 effective_flags; /* Do not change to 64 bit */
74 };
75
76
77 #define FREQ_QOS_MIN_DEFAULT_VALUE 0
78 #define FREQ_QOS_MAX_DEFAULT_VALUE S32_MAX
79
80 enum freq_qos_req_type {
81 FREQ_QOS_MIN = 1,
82 FREQ_QOS_MAX,
83 };
84
85 struct freq_constraints {
86 struct pm_qos_constraints min_freq;
87 struct blocking_notifier_head min_freq_notifiers;
88 struct pm_qos_constraints max_freq;
89 struct blocking_notifier_head max_freq_notifiers;
90 };
91
92 struct freq_qos_request {
93 enum freq_qos_req_type type;
94 struct plist_node pnode;
95 struct freq_constraints *qos;
96 };
97
98
99 enum dev_pm_qos_req_type {
100 DEV_PM_QOS_RESUME_LATENCY = 1,
101 DEV_PM_QOS_LATENCY_TOLERANCE,
102 DEV_PM_QOS_MIN_FREQUENCY,
103 DEV_PM_QOS_MAX_FREQUENCY,
104 DEV_PM_QOS_FLAGS,
105 };
106
107 struct dev_pm_qos_request {
108 enum dev_pm_qos_req_type type;
109 union {
110 struct plist_node pnode;
111 struct pm_qos_flags_request flr;
112 struct freq_qos_request freq;
113 } data;
114 struct device *dev;
115 };
116
117 struct dev_pm_qos {
118 struct pm_qos_constraints resume_latency;
119 struct pm_qos_constraints latency_tolerance;
120 struct freq_constraints freq;
121 struct pm_qos_flags flags;
122 struct dev_pm_qos_request *resume_latency_req;
123 struct dev_pm_qos_request *latency_tolerance_req;
124 struct dev_pm_qos_request *flags_req;
125 };
126
127 /* Action requested to pm_qos_update_target */
128 enum pm_qos_req_action {
129 PM_QOS_ADD_REQ, /* Add a new request */
130 PM_QOS_UPDATE_REQ, /* Update an existing request */
131 PM_QOS_REMOVE_REQ /* Remove an existing request */
132 };
133
dev_pm_qos_request_active(struct dev_pm_qos_request * req)134 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
135 {
136 return req->dev != NULL;
137 }
138
139 s32 pm_qos_read_value(struct pm_qos_constraints *c);
140 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
141 enum pm_qos_req_action action, int value);
142 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
143 struct pm_qos_flags_request *req,
144 enum pm_qos_req_action action, s32 val);
145
146 #ifdef CONFIG_CPU_IDLE
147 s32 cpu_latency_qos_limit(void);
148 bool cpu_latency_qos_request_active(struct pm_qos_request *req);
149 void cpu_latency_qos_add_request(struct pm_qos_request *req, s32 value);
150 void cpu_latency_qos_update_request(struct pm_qos_request *req, s32 new_value);
151 void cpu_latency_qos_remove_request(struct pm_qos_request *req);
152 #else
cpu_latency_qos_limit(void)153 static inline s32 cpu_latency_qos_limit(void) { return INT_MAX; }
cpu_latency_qos_request_active(struct pm_qos_request * req)154 static inline bool cpu_latency_qos_request_active(struct pm_qos_request *req)
155 {
156 return false;
157 }
cpu_latency_qos_add_request(struct pm_qos_request * req,s32 value)158 static inline void cpu_latency_qos_add_request(struct pm_qos_request *req,
159 s32 value) {}
cpu_latency_qos_update_request(struct pm_qos_request * req,s32 new_value)160 static inline void cpu_latency_qos_update_request(struct pm_qos_request *req,
161 s32 new_value) {}
cpu_latency_qos_remove_request(struct pm_qos_request * req)162 static inline void cpu_latency_qos_remove_request(struct pm_qos_request *req) {}
163 #endif
164
165 #ifdef CONFIG_PM_QOS_CPU_SYSTEM_WAKEUP
166 s32 cpu_wakeup_latency_qos_limit(void);
167 #else
cpu_wakeup_latency_qos_limit(void)168 static inline s32 cpu_wakeup_latency_qos_limit(void)
169 {
170 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
171 }
172 #endif
173
174 #ifdef CONFIG_PM
175 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
176 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
177 s32 __dev_pm_qos_resume_latency(struct device *dev);
178 s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type);
179 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
180 enum dev_pm_qos_req_type type, s32 value);
181 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
182 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
183 int dev_pm_qos_add_notifier(struct device *dev,
184 struct notifier_block *notifier,
185 enum dev_pm_qos_req_type type);
186 int dev_pm_qos_remove_notifier(struct device *dev,
187 struct notifier_block *notifier,
188 enum dev_pm_qos_req_type type);
189 void dev_pm_qos_constraints_init(struct device *dev);
190 void dev_pm_qos_constraints_destroy(struct device *dev);
191 int dev_pm_qos_add_ancestor_request(struct device *dev,
192 struct dev_pm_qos_request *req,
193 enum dev_pm_qos_req_type type, s32 value);
194 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
195 void dev_pm_qos_hide_latency_limit(struct device *dev);
196 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
197 void dev_pm_qos_hide_flags(struct device *dev);
198 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
199 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
200 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
201 int dev_pm_qos_expose_latency_tolerance(struct device *dev);
202 void dev_pm_qos_hide_latency_tolerance(struct device *dev);
203
dev_pm_qos_requested_resume_latency(struct device * dev)204 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
205 {
206 return dev->power.qos->resume_latency_req->data.pnode.prio;
207 }
208
dev_pm_qos_requested_flags(struct device * dev)209 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
210 {
211 return dev->power.qos->flags_req->data.flr.flags;
212 }
213
dev_pm_qos_raw_resume_latency(struct device * dev)214 static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
215 {
216 return IS_ERR_OR_NULL(dev->power.qos) ?
217 PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
218 pm_qos_read_value(&dev->power.qos->resume_latency);
219 }
220 #else
__dev_pm_qos_flags(struct device * dev,s32 mask)221 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
222 s32 mask)
223 { return PM_QOS_FLAGS_UNDEFINED; }
dev_pm_qos_flags(struct device * dev,s32 mask)224 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
225 s32 mask)
226 { return PM_QOS_FLAGS_UNDEFINED; }
__dev_pm_qos_resume_latency(struct device * dev)227 static inline s32 __dev_pm_qos_resume_latency(struct device *dev)
228 { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
dev_pm_qos_read_value(struct device * dev,enum dev_pm_qos_req_type type)229 static inline s32 dev_pm_qos_read_value(struct device *dev,
230 enum dev_pm_qos_req_type type)
231 {
232 switch (type) {
233 case DEV_PM_QOS_RESUME_LATENCY:
234 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
235 case DEV_PM_QOS_MIN_FREQUENCY:
236 return PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE;
237 case DEV_PM_QOS_MAX_FREQUENCY:
238 return PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE;
239 default:
240 WARN_ON(1);
241 return 0;
242 }
243 }
244
dev_pm_qos_add_request(struct device * dev,struct dev_pm_qos_request * req,enum dev_pm_qos_req_type type,s32 value)245 static inline int dev_pm_qos_add_request(struct device *dev,
246 struct dev_pm_qos_request *req,
247 enum dev_pm_qos_req_type type,
248 s32 value)
249 { return 0; }
dev_pm_qos_update_request(struct dev_pm_qos_request * req,s32 new_value)250 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
251 s32 new_value)
252 { return 0; }
dev_pm_qos_remove_request(struct dev_pm_qos_request * req)253 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
254 { return 0; }
dev_pm_qos_add_notifier(struct device * dev,struct notifier_block * notifier,enum dev_pm_qos_req_type type)255 static inline int dev_pm_qos_add_notifier(struct device *dev,
256 struct notifier_block *notifier,
257 enum dev_pm_qos_req_type type)
258 { return 0; }
dev_pm_qos_remove_notifier(struct device * dev,struct notifier_block * notifier,enum dev_pm_qos_req_type type)259 static inline int dev_pm_qos_remove_notifier(struct device *dev,
260 struct notifier_block *notifier,
261 enum dev_pm_qos_req_type type)
262 { return 0; }
dev_pm_qos_constraints_init(struct device * dev)263 static inline void dev_pm_qos_constraints_init(struct device *dev)
264 {
265 dev->power.power_state = PMSG_ON;
266 }
dev_pm_qos_constraints_destroy(struct device * dev)267 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
268 {
269 dev->power.power_state = PMSG_INVALID;
270 }
dev_pm_qos_add_ancestor_request(struct device * dev,struct dev_pm_qos_request * req,enum dev_pm_qos_req_type type,s32 value)271 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
272 struct dev_pm_qos_request *req,
273 enum dev_pm_qos_req_type type,
274 s32 value)
275 { return 0; }
dev_pm_qos_expose_latency_limit(struct device * dev,s32 value)276 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
277 { return 0; }
dev_pm_qos_hide_latency_limit(struct device * dev)278 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
dev_pm_qos_expose_flags(struct device * dev,s32 value)279 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
280 { return 0; }
dev_pm_qos_hide_flags(struct device * dev)281 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
dev_pm_qos_update_flags(struct device * dev,s32 m,bool set)282 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
283 { return 0; }
dev_pm_qos_get_user_latency_tolerance(struct device * dev)284 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
285 { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
dev_pm_qos_update_user_latency_tolerance(struct device * dev,s32 val)286 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
287 { return 0; }
dev_pm_qos_expose_latency_tolerance(struct device * dev)288 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
289 { return 0; }
dev_pm_qos_hide_latency_tolerance(struct device * dev)290 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
291
dev_pm_qos_requested_resume_latency(struct device * dev)292 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
293 {
294 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
295 }
dev_pm_qos_requested_flags(struct device * dev)296 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
dev_pm_qos_raw_resume_latency(struct device * dev)297 static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
298 {
299 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
300 }
301 #endif
302
freq_qos_request_active(struct freq_qos_request * req)303 static inline int freq_qos_request_active(struct freq_qos_request *req)
304 {
305 return !IS_ERR_OR_NULL(req->qos);
306 }
307
308 void freq_constraints_init(struct freq_constraints *qos);
309
310 s32 freq_qos_read_value(struct freq_constraints *qos,
311 enum freq_qos_req_type type);
312
313 int freq_qos_add_request(struct freq_constraints *qos,
314 struct freq_qos_request *req,
315 enum freq_qos_req_type type, s32 value);
316 int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
317 int freq_qos_remove_request(struct freq_qos_request *req);
318 int freq_qos_apply(struct freq_qos_request *req,
319 enum pm_qos_req_action action, s32 value);
320
321 int freq_qos_add_notifier(struct freq_constraints *qos,
322 enum freq_qos_req_type type,
323 struct notifier_block *notifier);
324 int freq_qos_remove_notifier(struct freq_constraints *qos,
325 enum freq_qos_req_type type,
326 struct notifier_block *notifier);
327
328 #endif
329