| 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 |