1 #ifndef _LINUX_PM_QOS_H
2 #define _LINUX_PM_QOS_H
3 /* interface for the pm_qos_power infrastructure of the linux kernel.
5 * Mark Gross <mgross@linux.intel.com>
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>
15 PM_QOS_CPU_DMA_LATENCY,
16 PM_QOS_NETWORK_LATENCY,
17 PM_QOS_NETWORK_THROUGHPUT,
19 /* insert new class ID */
23 enum pm_qos_flags_status {
24 PM_QOS_FLAGS_UNDEFINED = -1,
30 #define PM_QOS_DEFAULT_VALUE -1
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_RESUME_LATENCY_DEFAULT_VALUE 0
36 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
37 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
38 #define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1))
40 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
41 #define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
43 struct pm_qos_request {
44 struct plist_node node;
46 struct delayed_work work; /* for pm_qos_update_request_timeout */
49 struct pm_qos_flags_request {
50 struct list_head node;
51 s32 flags; /* Do not change to 64 bit */
54 enum dev_pm_qos_req_type {
55 DEV_PM_QOS_RESUME_LATENCY = 1,
56 DEV_PM_QOS_LATENCY_TOLERANCE,
60 struct dev_pm_qos_request {
61 enum dev_pm_qos_req_type type;
63 struct plist_node pnode;
64 struct pm_qos_flags_request flr;
71 PM_QOS_MAX, /* return the largest value */
72 PM_QOS_MIN /* return the smallest value */
76 * Note: The lockless read path depends on the CPU accessing target_value
77 * or effective_flags atomically. Atomic access is only guaranteed on all CPU
78 * types linux supports for 32 bit quantites
80 struct pm_qos_constraints {
81 struct plist_head list;
82 s32 target_value; /* Do not change to 64 bit */
84 s32 no_constraint_value;
85 enum pm_qos_type type;
86 struct blocking_notifier_head *notifiers;
90 struct list_head list;
91 s32 effective_flags; /* Do not change to 64 bit */
95 struct pm_qos_constraints resume_latency;
96 struct pm_qos_constraints latency_tolerance;
97 struct pm_qos_flags flags;
98 struct dev_pm_qos_request *resume_latency_req;
99 struct dev_pm_qos_request *latency_tolerance_req;
100 struct dev_pm_qos_request *flags_req;
103 /* Action requested to pm_qos_update_target */
104 enum pm_qos_req_action {
105 PM_QOS_ADD_REQ, /* Add a new request */
106 PM_QOS_UPDATE_REQ, /* Update an existing request */
107 PM_QOS_REMOVE_REQ /* Remove an existing request */
110 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
112 return req->dev != NULL;
115 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
116 enum pm_qos_req_action action, int value);
117 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
118 struct pm_qos_flags_request *req,
119 enum pm_qos_req_action action, s32 val);
120 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
122 void pm_qos_update_request(struct pm_qos_request *req,
124 void pm_qos_update_request_timeout(struct pm_qos_request *req,
125 s32 new_value, unsigned long timeout_us);
126 void pm_qos_remove_request(struct pm_qos_request *req);
128 int pm_qos_request(int pm_qos_class);
129 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
130 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
131 int pm_qos_request_active(struct pm_qos_request *req);
132 s32 pm_qos_read_value(struct pm_qos_constraints *c);
135 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
136 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
137 s32 __dev_pm_qos_read_value(struct device *dev);
138 s32 dev_pm_qos_read_value(struct device *dev);
139 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
140 enum dev_pm_qos_req_type type, s32 value);
141 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
142 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
143 int dev_pm_qos_add_notifier(struct device *dev,
144 struct notifier_block *notifier);
145 int dev_pm_qos_remove_notifier(struct device *dev,
146 struct notifier_block *notifier);
147 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
148 int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
149 void dev_pm_qos_constraints_init(struct device *dev);
150 void dev_pm_qos_constraints_destroy(struct device *dev);
151 int dev_pm_qos_add_ancestor_request(struct device *dev,
152 struct dev_pm_qos_request *req,
153 enum dev_pm_qos_req_type type, s32 value);
155 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
157 { return PM_QOS_FLAGS_UNDEFINED; }
158 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
160 { return PM_QOS_FLAGS_UNDEFINED; }
161 static inline s32 __dev_pm_qos_read_value(struct device *dev)
163 static inline s32 dev_pm_qos_read_value(struct device *dev)
165 static inline int dev_pm_qos_add_request(struct device *dev,
166 struct dev_pm_qos_request *req,
167 enum dev_pm_qos_req_type type,
170 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
173 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
175 static inline int dev_pm_qos_add_notifier(struct device *dev,
176 struct notifier_block *notifier)
178 static inline int dev_pm_qos_remove_notifier(struct device *dev,
179 struct notifier_block *notifier)
181 static inline int dev_pm_qos_add_global_notifier(
182 struct notifier_block *notifier)
184 static inline int dev_pm_qos_remove_global_notifier(
185 struct notifier_block *notifier)
187 static inline void dev_pm_qos_constraints_init(struct device *dev)
189 dev->power.power_state = PMSG_ON;
191 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
193 dev->power.power_state = PMSG_INVALID;
195 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
196 struct dev_pm_qos_request *req,
197 enum dev_pm_qos_req_type type,
202 #ifdef CONFIG_PM_RUNTIME
203 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
204 void dev_pm_qos_hide_latency_limit(struct device *dev);
205 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
206 void dev_pm_qos_hide_flags(struct device *dev);
207 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
208 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
209 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
211 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
213 return dev->power.qos->resume_latency_req->data.pnode.prio;
216 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
218 return dev->power.qos->flags_req->data.flr.flags;
221 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
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)
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)
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)
234 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
235 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }