root/include/linux/pm_qos.h

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INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. dev_pm_qos_request_active
  2. dev_pm_qos_requested_resume_latency
  3. dev_pm_qos_requested_flags
  4. dev_pm_qos_raw_resume_latency
  5. __dev_pm_qos_flags
  6. dev_pm_qos_flags
  7. __dev_pm_qos_resume_latency
  8. dev_pm_qos_read_value
  9. dev_pm_qos_add_request
  10. dev_pm_qos_update_request
  11. dev_pm_qos_remove_request
  12. dev_pm_qos_add_notifier
  13. dev_pm_qos_remove_notifier
  14. dev_pm_qos_constraints_init
  15. dev_pm_qos_constraints_destroy
  16. dev_pm_qos_add_ancestor_request
  17. dev_pm_qos_expose_latency_limit
  18. dev_pm_qos_hide_latency_limit
  19. dev_pm_qos_expose_flags
  20. dev_pm_qos_hide_flags
  21. dev_pm_qos_update_flags
  22. dev_pm_qos_get_user_latency_tolerance
  23. dev_pm_qos_update_user_latency_tolerance
  24. dev_pm_qos_expose_latency_tolerance
  25. dev_pm_qos_hide_latency_tolerance
  26. dev_pm_qos_requested_resume_latency
  27. dev_pm_qos_requested_flags
  28. dev_pm_qos_raw_resume_latency
  29. freq_qos_request_active
   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      S32_MAX
 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
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