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_DEV_LAT_DEFAULT_VALUE 0
37 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
38 #define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
40 struct pm_qos_request {
41 struct plist_node node;
43 struct delayed_work work; /* for pm_qos_update_request_timeout */
46 struct pm_qos_flags_request {
47 struct list_head node;
48 s32 flags; /* Do not change to 64 bit */
51 enum dev_pm_qos_req_type {
52 DEV_PM_QOS_LATENCY = 1,
56 struct dev_pm_qos_request {
57 enum dev_pm_qos_req_type type;
59 struct plist_node pnode;
60 struct pm_qos_flags_request flr;
67 PM_QOS_MAX, /* return the largest value */
68 PM_QOS_MIN /* return the smallest value */
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
76 struct pm_qos_constraints {
77 struct plist_head list;
78 s32 target_value; /* Do not change to 64 bit */
80 enum pm_qos_type type;
81 struct blocking_notifier_head *notifiers;
85 struct list_head list;
86 s32 effective_flags; /* Do not change to 64 bit */
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;
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 */
103 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
105 return req->dev != NULL;
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,
115 void pm_qos_update_request(struct pm_qos_request *req,
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);
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);
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);
147 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
149 { return PM_QOS_FLAGS_UNDEFINED; }
150 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
152 { return PM_QOS_FLAGS_UNDEFINED; }
153 static inline s32 __dev_pm_qos_read_value(struct device *dev)
155 static inline s32 dev_pm_qos_read_value(struct device *dev)
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,
162 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
165 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
167 static inline int dev_pm_qos_add_notifier(struct device *dev,
168 struct notifier_block *notifier)
170 static inline int dev_pm_qos_remove_notifier(struct device *dev,
171 struct notifier_block *notifier)
173 static inline int dev_pm_qos_add_global_notifier(
174 struct notifier_block *notifier)
176 static inline int dev_pm_qos_remove_global_notifier(
177 struct notifier_block *notifier)
179 static inline void dev_pm_qos_constraints_init(struct device *dev)
181 dev->power.power_state = PMSG_ON;
183 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
185 dev->power.power_state = PMSG_INVALID;
187 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
188 struct dev_pm_qos_request *req, s32 value)
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);
199 static inline s32 dev_pm_qos_requested_latency(struct device *dev)
201 return dev->power.qos->latency_req->data.pnode.prio;
204 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
206 return dev->power.qos->flags_req->data.flr.flags;
209 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
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)
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)
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; }