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/device.h>
  10 #include <linux/workqueue.h>
  11
  12 enum {
  13         PM_QOS_RESERVED = 0,
  14         PM_QOS_CPU_DMA_LATENCY,
  15         PM_QOS_NETWORK_LATENCY,
  16         PM_QOS_NETWORK_THROUGHPUT,
  17         PM_QOS_MEMORY_BANDWIDTH,
  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_MEMORY_BANDWIDTH_DEFAULT_VALUE   0
  36 #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE     0
  37 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE  0
  38 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT  (-1)
  39 #define PM_QOS_LATENCY_ANY                      ((s32)(~(__u32)0 >> 1))
  40
  41 #define PM_QOS_FLAG_NO_POWER_OFF        (1 << 0)
  42 #define PM_QOS_FLAG_REMOTE_WAKEUP       (1 << 1)
  43
  44 struct pm_qos_request {
  45         struct plist_node node;
  46         int pm_qos_class;
  47         struct delayed_work work; /* for pm_qos_update_request_timeout */
  48 };
  49
  50 struct pm_qos_flags_request {
  51         struct list_head node;
  52         s32 flags;      /* Do not change to 64 bit */
  53 };
  54
  55 enum dev_pm_qos_req_type {
  56         DEV_PM_QOS_RESUME_LATENCY = 1,
  57         DEV_PM_QOS_LATENCY_TOLERANCE,
  58         DEV_PM_QOS_FLAGS,
  59 };
  60
  61 struct dev_pm_qos_request {
  62         enum dev_pm_qos_req_type type;
  63         union {
  64                 struct plist_node pnode;
  65                 struct pm_qos_flags_request flr;
  66         } data;
  67         struct device *dev;
  68 };
  69
  70 enum pm_qos_type {
  71         PM_QOS_UNITIALIZED,
  72         PM_QOS_MAX,             /* return the largest value */
  73         PM_QOS_MIN,             /* return the smallest value */
  74         PM_QOS_SUM              /* return the sum */
  75 };
  76
  77 /*
  78  * Note: The lockless read path depends on the CPU accessing target_value
  79  * or effective_flags atomically.  Atomic access is only guaranteed on all CPU
  80  * types linux supports for 32 bit quantites
  81  */
  82 struct pm_qos_constraints {
  83         struct plist_head list;
  84         s32 target_value;       /* Do not change to 64 bit */
  85         s32 default_value;
  86         s32 no_constraint_value;
  87         enum pm_qos_type type;
  88         struct blocking_notifier_head *notifiers;
  89 };
  90
  91 struct pm_qos_flags {
  92         struct list_head list;
  93         s32 effective_flags;    /* Do not change to 64 bit */
  94 };
  95
  96 struct dev_pm_qos {
  97         struct pm_qos_constraints resume_latency;
  98         struct pm_qos_constraints latency_tolerance;
  99         struct pm_qos_flags flags;
 100         struct dev_pm_qos_request *resume_latency_req;
 101         struct dev_pm_qos_request *latency_tolerance_req;
 102         struct dev_pm_qos_request *flags_req;
 103 };
 104
 105 /* Action requested to pm_qos_update_target */
 106 enum pm_qos_req_action {
 107         PM_QOS_ADD_REQ,         /* Add a new request */
 108         PM_QOS_UPDATE_REQ,      /* Update an existing request */
 109         PM_QOS_REMOVE_REQ       /* Remove an existing request */
 110 };
 111
 112 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
 113 {
 114         return req->dev != NULL;
 115 }
 116
 117 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
 118                          enum pm_qos_req_action action, int value);
 119 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 120                          struct pm_qos_flags_request *req,
 121                          enum pm_qos_req_action action, s32 val);
 122 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
 123                         s32 value);
 124 void pm_qos_update_request(struct pm_qos_request *req,
 125                            s32 new_value);
 126 void pm_qos_update_request_timeout(struct pm_qos_request *req,
 127                                    s32 new_value, unsigned long timeout_us);
 128 void pm_qos_remove_request(struct pm_qos_request *req);
 129
 130 int pm_qos_request(int pm_qos_class);
 131 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
 132 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
 133 int pm_qos_request_active(struct pm_qos_request *req);
 134 s32 pm_qos_read_value(struct pm_qos_constraints *c);
 135
 136 #ifdef CONFIG_PM
 137 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
 138 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
 139 s32 __dev_pm_qos_read_value(struct device *dev);
 140 s32 dev_pm_qos_read_value(struct device *dev);
 141 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
 142                            enum dev_pm_qos_req_type type, s32 value);
 143 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
 144 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
 145 int dev_pm_qos_add_notifier(struct device *dev,
 146                             struct notifier_block *notifier);
 147 int dev_pm_qos_remove_notifier(struct device *dev,
 148                                struct notifier_block *notifier);
 149 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
 150 int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
 151 void dev_pm_qos_constraints_init(struct device *dev);
 152 void dev_pm_qos_constraints_destroy(struct device *dev);
 153 int dev_pm_qos_add_ancestor_request(struct device *dev,
 154                                     struct dev_pm_qos_request *req,
 155                                     enum dev_pm_qos_req_type type, s32 value);
 156 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
 157 void dev_pm_qos_hide_latency_limit(struct device *dev);
 158 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
 159 void dev_pm_qos_hide_flags(struct device *dev);
 160 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
 161 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
 162 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
 163 int dev_pm_qos_expose_latency_tolerance(struct device *dev);
 164 void dev_pm_qos_hide_latency_tolerance(struct device *dev);
 165
 166 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
 167 {
 168         return dev->power.qos->resume_latency_req->data.pnode.prio;
 169 }
 170
 171 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
 172 {
 173         return dev->power.qos->flags_req->data.flr.flags;
 174 }
 175 #else
 176 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
 177                                                           s32 mask)
 178                         { return PM_QOS_FLAGS_UNDEFINED; }
 179 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
 180                                                         s32 mask)
 181                         { return PM_QOS_FLAGS_UNDEFINED; }
 182 static inline s32 __dev_pm_qos_read_value(struct device *dev)
 183                         { return 0; }
 184 static inline s32 dev_pm_qos_read_value(struct device *dev)
 185                         { return 0; }
 186 static inline int dev_pm_qos_add_request(struct device *dev,
 187                                          struct dev_pm_qos_request *req,
 188                                          enum dev_pm_qos_req_type type,
 189                                          s32 value)
 190                         { return 0; }
 191 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
 192                                             s32 new_value)
 193                         { return 0; }
 194 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
 195                         { return 0; }
 196 static inline int dev_pm_qos_add_notifier(struct device *dev,
 197                                           struct notifier_block *notifier)
 198                         { return 0; }
 199 static inline int dev_pm_qos_remove_notifier(struct device *dev,
 200                                              struct notifier_block *notifier)
 201                         { return 0; }
 202 static inline int dev_pm_qos_add_global_notifier(
 203                                         struct notifier_block *notifier)
 204                         { return 0; }
 205 static inline int dev_pm_qos_remove_global_notifier(
 206                                         struct notifier_block *notifier)
 207                         { return 0; }
 208 static inline void dev_pm_qos_constraints_init(struct device *dev)
 209 {
 210         dev->power.power_state = PMSG_ON;
 211 }
 212 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
 213 {
 214         dev->power.power_state = PMSG_INVALID;
 215 }
 216 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
 217                                                   struct dev_pm_qos_request *req,
 218                                                   enum dev_pm_qos_req_type type,
 219                                                   s32 value)
 220                         { return 0; }
 221 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
 222                         { return 0; }
 223 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
 224 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
 225                         { return 0; }
 226 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
 227 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
 228                         { return 0; }
 229 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
 230                         { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
 231 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
 232                         { return 0; }
 233 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
 234                         { return 0; }
 235 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
 236
 237 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
 238 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
 239 #endif
 240
 241 #endif