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/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 242