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 <[email protected]> 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 223