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         PM_QOS_NETWORK_LATENCY,
  17         PM_QOS_NETWORK_THROUGHPUT,
  18         PM_QOS_MEMORY_BANDWIDTH,
  19
  20         /* insert new class ID */
  21         PM_QOS_NUM_CLASSES,
  22 };
  23
  24 enum pm_qos_flags_status {
  25         PM_QOS_FLAGS_UNDEFINED = -1,
  26         PM_QOS_FLAGS_NONE,
  27         PM_QOS_FLAGS_SOME,
  28         PM_QOS_FLAGS_ALL,
  29 };
  30
  31 #define PM_QOS_DEFAULT_VALUE    (-1)
  32 #define PM_QOS_LATENCY_ANY      S32_MAX
  33 #define PM_QOS_LATENCY_ANY_NS   ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)
  34
  35 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  36 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  37 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
  38 #define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE   0
  39 #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE     PM_QOS_LATENCY_ANY
  40 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT     PM_QOS_LATENCY_ANY
  41 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS  PM_QOS_LATENCY_ANY_NS
  42 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE  0
  43 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT  (-1)
  44
  45 #define PM_QOS_FLAG_NO_POWER_OFF        (1 << 0)
  46
  47 struct pm_qos_request {
  48         struct plist_node node;
  49         int pm_qos_class;
  50         struct delayed_work work; /* for pm_qos_update_request_timeout */
  51 };
  52
  53 struct pm_qos_flags_request {
  54         struct list_head node;
  55         s32 flags;      /* Do not change to 64 bit */
  56 };
  57
  58 enum dev_pm_qos_req_type {
  59         DEV_PM_QOS_RESUME_LATENCY = 1,
  60         DEV_PM_QOS_LATENCY_TOLERANCE,
  61         DEV_PM_QOS_FLAGS,
  62 };
  63
  64 struct dev_pm_qos_request {
  65         enum dev_pm_qos_req_type type;
  66         union {
  67                 struct plist_node pnode;
  68                 struct pm_qos_flags_request flr;
  69         } data;
  70         struct device *dev;
  71 };
  72
  73 enum pm_qos_type {
  74         PM_QOS_UNITIALIZED,
  75         PM_QOS_MAX,             /* return the largest value */
  76         PM_QOS_MIN,             /* return the smallest value */
  77         PM_QOS_SUM              /* return the sum */
  78 };
  79
  80 /*
  81  * Note: The lockless read path depends on the CPU accessing target_value
  82  * or effective_flags atomically.  Atomic access is only guaranteed on all CPU
  83  * types linux supports for 32 bit quantites
  84  */
  85 struct pm_qos_constraints {
  86         struct plist_head list;
  87         s32 target_value;       /* Do not change to 64 bit */
  88         s32 default_value;
  89         s32 no_constraint_value;
  90         enum pm_qos_type type;
  91         struct blocking_notifier_head *notifiers;
  92 };
  93
  94 struct pm_qos_flags {
  95         struct list_head list;
  96         s32 effective_flags;    /* Do not change to 64 bit */
  97 };
  98
  99 struct dev_pm_qos {
 100         struct pm_qos_constraints resume_latency;
 101         struct pm_qos_constraints latency_tolerance;
 102         struct pm_qos_flags flags;
 103         struct dev_pm_qos_request *resume_latency_req;
 104         struct dev_pm_qos_request *latency_tolerance_req;
 105         struct dev_pm_qos_request *flags_req;
 106 };
 107
 108 /* Action requested to pm_qos_update_target */
 109 enum pm_qos_req_action {
 110         PM_QOS_ADD_REQ,         /* Add a new request */
 111         PM_QOS_UPDATE_REQ,      /* Update an existing request */
 112         PM_QOS_REMOVE_REQ       /* Remove an existing request */
 113 };
 114
 115 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
 116 {
 117         return req->dev != NULL;
 118 }
 119
 120 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
 121                          enum pm_qos_req_action action, int value);
 122 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 123                          struct pm_qos_flags_request *req,
 124                          enum pm_qos_req_action action, s32 val);
 125 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
 126                         s32 value);
 127 void pm_qos_update_request(struct pm_qos_request *req,
 128                            s32 new_value);
 129 void pm_qos_update_request_timeout(struct pm_qos_request *req,
 130                                    s32 new_value, unsigned long timeout_us);
 131 void pm_qos_remove_request(struct pm_qos_request *req);
 132
 133 int pm_qos_request(int pm_qos_class);
 134 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
 135 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
 136 int pm_qos_request_active(struct pm_qos_request *req);
 137 s32 pm_qos_read_value(struct pm_qos_constraints *c);
 138
 139 #ifdef CONFIG_PM
 140 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
 141 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
 142 s32 __dev_pm_qos_read_value(struct device *dev);
 143 s32 dev_pm_qos_read_value(struct device *dev);
 144 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
 145                            enum dev_pm_qos_req_type type, s32 value);
 146 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
 147 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
 148 int dev_pm_qos_add_notifier(struct device *dev,
 149                             struct notifier_block *notifier);
 150 int dev_pm_qos_remove_notifier(struct device *dev,
 151                                struct notifier_block *notifier);
 152 void dev_pm_qos_constraints_init(struct device *dev);
 153 void dev_pm_qos_constraints_destroy(struct device *dev);
 154 int dev_pm_qos_add_ancestor_request(struct device *dev,
 155                                     struct dev_pm_qos_request *req,
 156                                     enum dev_pm_qos_req_type type, s32 value);
 157 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
 158 void dev_pm_qos_hide_latency_limit(struct device *dev);
 159 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
 160 void dev_pm_qos_hide_flags(struct device *dev);
 161 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
 162 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
 163 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
 164 int dev_pm_qos_expose_latency_tolerance(struct device *dev);
 165 void dev_pm_qos_hide_latency_tolerance(struct device *dev);
 166
 167 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
 168 {
 169         return dev->power.qos->resume_latency_req->data.pnode.prio;
 170 }
 171
 172 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
 173 {
 174         return dev->power.qos->flags_req->data.flr.flags;
 175 }
 176
 177 static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
 178 {
 179         return IS_ERR_OR_NULL(dev->power.qos) ?
 180                 PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
 181                 pm_qos_read_value(&dev->power.qos->resume_latency);
 182 }
 183 #else
 184 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
 185                                                           s32 mask)
 186                         { return PM_QOS_FLAGS_UNDEFINED; }
 187 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
 188                                                         s32 mask)
 189                         { return PM_QOS_FLAGS_UNDEFINED; }
 190 static inline s32 __dev_pm_qos_read_value(struct device *dev)
 191                         { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
 192 static inline s32 dev_pm_qos_read_value(struct device *dev)
 193                         { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
 194 static inline int dev_pm_qos_add_request(struct device *dev,
 195                                          struct dev_pm_qos_request *req,
 196                                          enum dev_pm_qos_req_type type,
 197                                          s32 value)
 198                         { return 0; }
 199 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
 200                                             s32 new_value)
 201                         { return 0; }
 202 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
 203                         { return 0; }
 204 static inline int dev_pm_qos_add_notifier(struct device *dev,
 205                                           struct notifier_block *notifier)
 206                         { return 0; }
 207 static inline int dev_pm_qos_remove_notifier(struct device *dev,
 208                                              struct notifier_block *notifier)
 209                         { return 0; }
 210 static inline void dev_pm_qos_constraints_init(struct device *dev)
 211 {
 212         dev->power.power_state = PMSG_ON;
 213 }
 214 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
 215 {
 216         dev->power.power_state = PMSG_INVALID;
 217 }
 218 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
 219                                                   struct dev_pm_qos_request *req,
 220                                                   enum dev_pm_qos_req_type type,
 221                                                   s32 value)
 222                         { return 0; }
 223 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
 224                         { return 0; }
 225 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
 226 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
 227                         { return 0; }
 228 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
 229 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
 230                         { return 0; }
 231 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
 232                         { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
 233 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
 234                         { return 0; }
 235 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
 236                         { return 0; }
 237 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
 238
 239 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
 240 {
 241         return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
 242 }
 243 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
 244 static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
 245 {
 246         return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
 247 }
 248 #endif
 249
 250 #endif