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,
18 #ifdef CONFIG_CPUQUIET_FRAMEWORK
19 PM_QOS_MIN_ONLINE_CPUS,
20 PM_QOS_MAX_ONLINE_CPUS,
23 /* insert new class ID */
27 enum pm_qos_flags_status {
28 PM_QOS_FLAGS_UNDEFINED = -1,
34 #define PM_QOS_DEFAULT_VALUE -1
36 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
37 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
38 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
39 #ifdef CONFIG_CPUQUIET_FRAMEWORK
40 #define PM_QOS_MIN_ONLINE_CPUS_DEFAULT_VALUE 0
41 #define PM_QOS_MAX_ONLINE_CPUS_DEFAULT_VALUE INT_MAX
43 #define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
45 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
46 #define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
48 struct pm_qos_request {
49 struct plist_node node;
51 struct delayed_work work; /* for pm_qos_update_request_timeout */
54 struct pm_qos_flags_request {
55 struct list_head node;
56 s32 flags; /* Do not change to 64 bit */
59 enum dev_pm_qos_req_type {
60 DEV_PM_QOS_LATENCY = 1,
64 struct dev_pm_qos_request {
65 enum dev_pm_qos_req_type type;
67 struct plist_node pnode;
68 struct pm_qos_flags_request flr;
75 PM_QOS_MAX, /* return the largest value */
76 PM_QOS_MIN /* return the smallest value */
80 * Note: The lockless read path depends on the CPU accessing target_value
81 * or effective_flags atomically. Atomic access is only guaranteed on all CPU
82 * types linux supports for 32 bit quantites
84 struct pm_qos_constraints {
85 struct plist_head list;
86 s32 target_value; /* Do not change to 64 bit */
88 enum pm_qos_type type;
89 struct blocking_notifier_head *notifiers;
93 struct list_head list;
94 s32 effective_flags; /* Do not change to 64 bit */
98 struct pm_qos_constraints latency;
99 struct pm_qos_flags flags;
100 struct dev_pm_qos_request *latency_req;
101 struct dev_pm_qos_request *flags_req;
104 /* Action requested to pm_qos_update_target */
105 enum pm_qos_req_action {
106 PM_QOS_ADD_REQ, /* Add a new request */
107 PM_QOS_UPDATE_REQ, /* Update an existing request */
108 PM_QOS_REMOVE_REQ /* Remove an existing request */
111 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
113 return req->dev != NULL;
116 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
117 enum pm_qos_req_action action, int value);
118 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
119 struct pm_qos_flags_request *req,
120 enum pm_qos_req_action action, s32 val);
121 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
123 void pm_qos_update_request(struct pm_qos_request *req,
125 void pm_qos_update_request_timeout(struct pm_qos_request *req,
126 s32 new_value, unsigned long timeout_us);
127 void pm_qos_remove_request(struct pm_qos_request *req);
129 int pm_qos_request(int pm_qos_class);
130 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
131 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
132 int pm_qos_request_active(struct pm_qos_request *req);
133 s32 pm_qos_read_value(struct pm_qos_constraints *c);
136 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
137 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
138 s32 __dev_pm_qos_read_value(struct device *dev);
139 s32 dev_pm_qos_read_value(struct device *dev);
140 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
141 enum dev_pm_qos_req_type type, s32 value);
142 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
143 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
144 int dev_pm_qos_add_notifier(struct device *dev,
145 struct notifier_block *notifier);
146 int dev_pm_qos_remove_notifier(struct device *dev,
147 struct notifier_block *notifier);
148 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
149 int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
150 void dev_pm_qos_constraints_init(struct device *dev);
151 void dev_pm_qos_constraints_destroy(struct device *dev);
152 int dev_pm_qos_add_ancestor_request(struct device *dev,
153 struct dev_pm_qos_request *req, 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, s32 value)
200 #ifdef CONFIG_PM_RUNTIME
201 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
202 void dev_pm_qos_hide_latency_limit(struct device *dev);
203 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
204 void dev_pm_qos_hide_flags(struct device *dev);
205 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
207 static inline s32 dev_pm_qos_requested_latency(struct device *dev)
209 return dev->power.qos->latency_req->data.pnode.prio;
212 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
214 return dev->power.qos->flags_req->data.flr.flags;
217 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
219 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
220 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
222 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
223 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
226 static inline s32 dev_pm_qos_requested_latency(struct device *dev) { return 0; }
227 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }