include/linux/pm_qos.h

   1 #ifndef _LINUX_PM_QOS_H
   2 #define _LINUX_PM_QOS_H
   3 /* interface for the pm_qos_power infrastructure of the linux kernel.
   4  *
   5  * Mark Gross <mgross@linux.intel.com>
   6  */
   7 #include <linux/plist.h>
   8 #include <linux/notifier.h>
   9 #include <linux/miscdevice.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
  19         /* insert new class ID */
  20         PM_QOS_NUM_CLASSES,
  21 };
  22
  23 enum pm_qos_flags_status {
  24         PM_QOS_FLAGS_UNDEFINED = -1,
  25         PM_QOS_FLAGS_NONE,
  26         PM_QOS_FLAGS_SOME,
  27         PM_QOS_FLAGS_ALL,
  28 };
  29
  30 #define PM_QOS_DEFAULT_VALUE -1
  31
  32 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  33 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  34 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
  35 #define PM_QOS_DEV_LAT_DEFAULT_VALUE            0
  36
  37 #define PM_QOS_FLAG_NO_POWER_OFF        (1 << 0)
  38 #define PM_QOS_FLAG_REMOTE_WAKEUP       (1 << 1)
  39
  40 struct pm_qos_request {
  41         struct plist_node node;
  42         int pm_qos_class;
  43         struct delayed_work work; /* for pm_qos_update_request_timeout */
  44 };
  45
  46 struct pm_qos_flags_request {
  47         struct list_head node;
  48         s32 flags;      /* Do not change to 64 bit */
  49 };
  50
  51 enum dev_pm_qos_req_type {
  52         DEV_PM_QOS_LATENCY = 1,
  53         DEV_PM_QOS_FLAGS,
  54 };
  55
  56 struct dev_pm_qos_request {
  57         enum dev_pm_qos_req_type type;
  58         union {
  59                 struct plist_node pnode;
  60                 struct pm_qos_flags_request flr;
  61         } data;
  62         struct device *dev;
  63 };
  64
  65 enum pm_qos_type {
  66         PM_QOS_UNITIALIZED,
  67         PM_QOS_MAX,             /* return the largest value */
  68         PM_QOS_MIN              /* return the smallest value */
  69 };
  70
  71 /*
  72  * Note: The lockless read path depends on the CPU accessing target_value
  73  * or effective_flags atomically.  Atomic access is only guaranteed on all CPU
  74  * types linux supports for 32 bit quantites
  75  */
  76 struct pm_qos_constraints {
  77         struct plist_head list;
  78         s32 target_value;       /* Do not change to 64 bit */
  79         s32 default_value;
  80         enum pm_qos_type type;
  81         struct blocking_notifier_head *notifiers;
  82 };
  83
  84 struct pm_qos_flags {
  85         struct list_head list;
  86         s32 effective_flags;    /* Do not change to 64 bit */
  87 };
  88
  89 struct dev_pm_qos {
  90         struct pm_qos_constraints latency;
  91         struct pm_qos_flags flags;
  92         struct dev_pm_qos_request *latency_req;
  93         struct dev_pm_qos_request *flags_req;
  94 };
  95
  96 /* Action requested to pm_qos_update_target */
  97 enum pm_qos_req_action {
  98         PM_QOS_ADD_REQ,         /* Add a new request */
  99         PM_QOS_UPDATE_REQ,      /* Update an existing request */
 100         PM_QOS_REMOVE_REQ       /* Remove an existing request */
 101 };
 102
 103 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
 104 {
 105         return req->dev != NULL;
 106 }
 107
 108 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
 109                          enum pm_qos_req_action action, int value);
 110 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 111                          struct pm_qos_flags_request *req,
 112                          enum pm_qos_req_action action, s32 val);
 113 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
 114                         s32 value);
 115 void pm_qos_update_request(struct pm_qos_request *req,
 116                            s32 new_value);
 117 void pm_qos_update_request_timeout(struct pm_qos_request *req,
 118                                    s32 new_value, unsigned long timeout_us);
 119 void pm_qos_remove_request(struct pm_qos_request *req);
 120
 121 int pm_qos_request(int pm_qos_class);
 122 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
 123 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
 124 int pm_qos_request_active(struct pm_qos_request *req);
 125 s32 pm_qos_read_value(struct pm_qos_constraints *c);
 126
 127 #ifdef CONFIG_PM
 128 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
 129 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
 130 s32 __dev_pm_qos_read_value(struct device *dev);
 131 s32 dev_pm_qos_read_value(struct device *dev);
 132 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
 133                            enum dev_pm_qos_req_type type, s32 value);
 134 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
 135 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
 136 int dev_pm_qos_add_notifier(struct device *dev,
 137                             struct notifier_block *notifier);
 138 int dev_pm_qos_remove_notifier(struct device *dev,
 139                                struct notifier_block *notifier);
 140 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
 141 int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
 142 void dev_pm_qos_constraints_init(struct device *dev);
 143 void dev_pm_qos_constraints_destroy(struct device *dev);
 144 int dev_pm_qos_add_ancestor_request(struct device *dev,
 145                                     struct dev_pm_qos_request *req, s32 value);
 146 #else
 147 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
 148                                                           s32 mask)
 149                         { return PM_QOS_FLAGS_UNDEFINED; }
 150 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
 151                                                         s32 mask)
 152                         { return PM_QOS_FLAGS_UNDEFINED; }
 153 static inline s32 __dev_pm_qos_read_value(struct device *dev)
 154                         { return 0; }
 155 static inline s32 dev_pm_qos_read_value(struct device *dev)
 156                         { return 0; }
 157 static inline int dev_pm_qos_add_request(struct device *dev,
 158                                          struct dev_pm_qos_request *req,
 159                                          enum dev_pm_qos_req_type type,
 160                                          s32 value)
 161                         { return 0; }
 162 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
 163                                             s32 new_value)
 164                         { return 0; }
 165 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
 166                         { return 0; }
 167 static inline int dev_pm_qos_add_notifier(struct device *dev,
 168                                           struct notifier_block *notifier)
 169                         { return 0; }
 170 static inline int dev_pm_qos_remove_notifier(struct device *dev,
 171                                              struct notifier_block *notifier)
 172                         { return 0; }
 173 static inline int dev_pm_qos_add_global_notifier(
 174                                         struct notifier_block *notifier)
 175                         { return 0; }
 176 static inline int dev_pm_qos_remove_global_notifier(
 177                                         struct notifier_block *notifier)
 178                         { return 0; }
 179 static inline void dev_pm_qos_constraints_init(struct device *dev)
 180 {
 181         dev->power.power_state = PMSG_ON;
 182 }
 183 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
 184 {
 185         dev->power.power_state = PMSG_INVALID;
 186 }
 187 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
 188                                     struct dev_pm_qos_request *req, s32 value)
 189                         { return 0; }
 190 #endif
 191
 192 #ifdef CONFIG_PM_RUNTIME
 193 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
 194 void dev_pm_qos_hide_latency_limit(struct device *dev);
 195 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
 196 void dev_pm_qos_hide_flags(struct device *dev);
 197 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
 198
 199 static inline s32 dev_pm_qos_requested_latency(struct device *dev)
 200 {
 201         return dev->power.qos->latency_req->data.pnode.prio;
 202 }
 203
 204 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
 205 {
 206         return dev->power.qos->flags_req->data.flr.flags;
 207 }
 208 #else
 209 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
 210                         { return 0; }
 211 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
 212 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
 213                         { return 0; }
 214 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
 215 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
 216                         { return 0; }
 217
 218 static inline s32 dev_pm_qos_requested_latency(struct device *dev) { return 0; }
 219 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
 220 #endif
 221
 222 #endif