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         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
  33 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  34 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE        (2000 * USEC_PER_SEC)
  35 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
  36 #define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE   0
  37 #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE     0
  38 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE  0
  39 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT  (-1)
  40 #define PM_QOS_LATENCY_ANY                      ((s32)(~(__u32)0 >> 1))
  41
  42 #define PM_QOS_FLAG_NO_POWER_OFF        (1 << 0)
  43 #define PM_QOS_FLAG_REMOTE_WAKEUP       (1 << 1)
  44
  45 struct pm_qos_request {
  46         struct plist_node node;
  47         int pm_qos_class;
  48         struct delayed_work work; /* for pm_qos_update_request_timeout */
  49 };
  50
  51 struct pm_qos_flags_request {
  52         struct list_head node;
  53         s32 flags;      /* Do not change to 64 bit */
  54 };
  55
  56 enum dev_pm_qos_req_type {
  57         DEV_PM_QOS_RESUME_LATENCY = 1,
  58         DEV_PM_QOS_LATENCY_TOLERANCE,
  59         DEV_PM_QOS_FLAGS,
  60 };
  61
  62 struct dev_pm_qos_request {
  63         enum dev_pm_qos_req_type type;
  64         union {
  65                 struct plist_node pnode;
  66                 struct pm_qos_flags_request flr;
  67         } data;
  68         struct device *dev;
  69 };
  70
  71 enum pm_qos_type {
  72         PM_QOS_UNITIALIZED,
  73         PM_QOS_MAX,             /* return the largest value */
  74         PM_QOS_MIN,             /* return the smallest value */
  75         PM_QOS_SUM              /* return the sum */
  76 };
  77
  78 /*
  79  * Note: The lockless read path depends on the CPU accessing target_value
  80  * or effective_flags atomically.  Atomic access is only guaranteed on all CPU
  81  * types linux supports for 32 bit quantites
  82  */
  83 struct pm_qos_constraints {
  84         struct plist_head list;
  85         s32 target_value;       /* Do not change to 64 bit */
  86         s32 default_value;
  87         s32 no_constraint_value;
  88         enum pm_qos_type type;
  89         struct blocking_notifier_head *notifiers;
  90 };
  91
  92 struct pm_qos_flags {
  93         struct list_head list;
  94         s32 effective_flags;    /* Do not change to 64 bit */
  95 };
  96
  97 struct dev_pm_qos {
  98         struct pm_qos_constraints resume_latency;
  99         struct pm_qos_constraints latency_tolerance;
 100         struct pm_qos_flags flags;
 101         struct dev_pm_qos_request *resume_latency_req;
 102         struct dev_pm_qos_request *latency_tolerance_req;
 103         struct dev_pm_qos_request *flags_req;
 104 };
 105
 106 /* Action requested to pm_qos_update_target */
 107 enum pm_qos_req_action {
 108         PM_QOS_ADD_REQ,         /* Add a new request */
 109         PM_QOS_UPDATE_REQ,      /* Update an existing request */
 110         PM_QOS_REMOVE_REQ       /* Remove an existing request */
 111 };
 112
 113 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
 114 {
 115         return req->dev != NULL;
 116 }
 117
 118 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
 119                          enum pm_qos_req_action action, int value);
 120 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 121                          struct pm_qos_flags_request *req,
 122                          enum pm_qos_req_action action, s32 val);
 123 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
 124                         s32 value);
 125 void pm_qos_update_request(struct pm_qos_request *req,
 126                            s32 new_value);
 127 void pm_qos_update_request_timeout(struct pm_qos_request *req,
 128                                    s32 new_value, unsigned long timeout_us);
 129 void pm_qos_remove_request(struct pm_qos_request *req);
 130
 131 int pm_qos_request(int pm_qos_class);
 132 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
 133 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
 134 int pm_qos_request_active(struct pm_qos_request *req);
 135 s32 pm_qos_read_value(struct pm_qos_constraints *c);
 136
 137 #ifdef CONFIG_PM
 138 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
 139 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
 140 s32 __dev_pm_qos_read_value(struct device *dev);
 141 s32 dev_pm_qos_read_value(struct device *dev);
 142 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
 143                            enum dev_pm_qos_req_type type, s32 value);
 144 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
 145 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
 146 int dev_pm_qos_add_notifier(struct device *dev,
 147                             struct notifier_block *notifier);
 148 int dev_pm_qos_remove_notifier(struct device *dev,
 149                                struct notifier_block *notifier);
 150 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
 151 int dev_pm_qos_remove_global_notifier(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 #else
 177 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
 178                                                           s32 mask)
 179                         { return PM_QOS_FLAGS_UNDEFINED; }
 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 s32 __dev_pm_qos_read_value(struct device *dev)
 184                         { return 0; }
 185 static inline s32 dev_pm_qos_read_value(struct device *dev)
 186                         { return 0; }
 187 static inline int dev_pm_qos_add_request(struct device *dev,
 188                                          struct dev_pm_qos_request *req,
 189                                          enum dev_pm_qos_req_type type,
 190                                          s32 value)
 191                         { return 0; }
 192 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
 193                                             s32 new_value)
 194                         { return 0; }
 195 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
 196                         { return 0; }
 197 static inline int dev_pm_qos_add_notifier(struct device *dev,
 198                                           struct notifier_block *notifier)
 199                         { return 0; }
 200 static inline int dev_pm_qos_remove_notifier(struct device *dev,
 201                                              struct notifier_block *notifier)
 202                         { return 0; }
 203 static inline int dev_pm_qos_add_global_notifier(
 204                                         struct notifier_block *notifier)
 205                         { return 0; }
 206 static inline int dev_pm_qos_remove_global_notifier(
 207                                         struct notifier_block *notifier)
 208                         { return 0; }
 209 static inline void dev_pm_qos_constraints_init(struct device *dev)
 210 {
 211         dev->power.power_state = PMSG_ON;
 212 }
 213 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
 214 {
 215         dev->power.power_state = PMSG_INVALID;
 216 }
 217 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
 218                                                   struct dev_pm_qos_request *req,
 219                                                   enum dev_pm_qos_req_type type,
 220                                                   s32 value)
 221                         { return 0; }
 222 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
 223                         { return 0; }
 224 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
 225 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
 226                         { return 0; }
 227 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
 228 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
 229                         { return 0; }
 230 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
 231                         { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
 232 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
 233                         { return 0; }
 234 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
 235                         { return 0; }
 236 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
 237
 238 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
 239 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
 240 #endif
 241
 242 #endif