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 #define PM_QOS_DEFAULT_VALUE -1
24
25 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
26 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
27 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
28 #define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
29
30 struct pm_qos_request {
31 struct plist_node node;
32 int pm_qos_class;
33 struct delayed_work work; /* for pm_qos_update_request_timeout */
34 };
35
36 struct dev_pm_qos_request {
37 struct plist_node node;
38 struct device *dev;
39 };
40
41 enum pm_qos_type {
42 PM_QOS_UNITIALIZED,
43 PM_QOS_MAX, /* return the largest value */
44 PM_QOS_MIN /* return the smallest value */
45 };
46
47 /*
48 * Note: The lockless read path depends on the CPU accessing
49 * target_value atomically. Atomic access is only guaranteed on all CPU
50 * types linux supports for 32 bit quantites
51 */
52 struct pm_qos_constraints {
53 struct plist_head list;
54 s32 target_value; /* Do not change to 64 bit */
55 s32 default_value;
56 enum pm_qos_type type;
57 struct blocking_notifier_head *notifiers;
58 };
59
60 /* Action requested to pm_qos_update_target */
61 enum pm_qos_req_action {
62 PM_QOS_ADD_REQ, /* Add a new request */
63 PM_QOS_UPDATE_REQ, /* Update an existing request */
64 PM_QOS_REMOVE_REQ /* Remove an existing request */
65 };
66
dev_pm_qos_request_active(struct dev_pm_qos_request * req)67 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
68 {
69 return req->dev != 0;
70 }
71
72 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
73 enum pm_qos_req_action action, int value);
74 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
75 s32 value);
76 void pm_qos_update_request(struct pm_qos_request *req,
77 s32 new_value);
78 void pm_qos_update_request_timeout(struct pm_qos_request *req,
79 s32 new_value, unsigned long timeout_us);
80 void pm_qos_remove_request(struct pm_qos_request *req);
81
82 int pm_qos_request(int pm_qos_class);
83 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
84 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
85 int pm_qos_request_active(struct pm_qos_request *req);
86 s32 pm_qos_read_value(struct pm_qos_constraints *c);
87
88 #ifdef CONFIG_PM
89 s32 __dev_pm_qos_read_value(struct device *dev);
90 s32 dev_pm_qos_read_value(struct device *dev);
91 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
92 s32 value);
93 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
94 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
95 int dev_pm_qos_add_notifier(struct device *dev,
96 struct notifier_block *notifier);
97 int dev_pm_qos_remove_notifier(struct device *dev,
98 struct notifier_block *notifier);
99 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
100 int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
101 void dev_pm_qos_constraints_init(struct device *dev);
102 void dev_pm_qos_constraints_destroy(struct device *dev);
103 int dev_pm_qos_add_ancestor_request(struct device *dev,
104 struct dev_pm_qos_request *req, s32 value);
105 #else
__dev_pm_qos_read_value(struct device * dev)106 static inline s32 __dev_pm_qos_read_value(struct device *dev)
107 { return 0; }
dev_pm_qos_read_value(struct device * dev)108 static inline s32 dev_pm_qos_read_value(struct device *dev)
109 { return 0; }
dev_pm_qos_add_request(struct device * dev,struct dev_pm_qos_request * req,s32 value)110 static inline int dev_pm_qos_add_request(struct device *dev,
111 struct dev_pm_qos_request *req,
112 s32 value)
113 { return 0; }
dev_pm_qos_update_request(struct dev_pm_qos_request * req,s32 new_value)114 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
115 s32 new_value)
116 { return 0; }
dev_pm_qos_remove_request(struct dev_pm_qos_request * req)117 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
118 { return 0; }
dev_pm_qos_add_notifier(struct device * dev,struct notifier_block * notifier)119 static inline int dev_pm_qos_add_notifier(struct device *dev,
120 struct notifier_block *notifier)
121 { return 0; }
dev_pm_qos_remove_notifier(struct device * dev,struct notifier_block * notifier)122 static inline int dev_pm_qos_remove_notifier(struct device *dev,
123 struct notifier_block *notifier)
124 { return 0; }
dev_pm_qos_add_global_notifier(struct notifier_block * notifier)125 static inline int dev_pm_qos_add_global_notifier(
126 struct notifier_block *notifier)
127 { return 0; }
dev_pm_qos_remove_global_notifier(struct notifier_block * notifier)128 static inline int dev_pm_qos_remove_global_notifier(
129 struct notifier_block *notifier)
130 { return 0; }
dev_pm_qos_constraints_init(struct device * dev)131 static inline void dev_pm_qos_constraints_init(struct device *dev)
132 {
133 dev->power.power_state = PMSG_ON;
134 }
dev_pm_qos_constraints_destroy(struct device * dev)135 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
136 {
137 dev->power.power_state = PMSG_INVALID;
138 }
dev_pm_qos_add_ancestor_request(struct device * dev,struct dev_pm_qos_request * req,s32 value)139 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
140 struct dev_pm_qos_request *req, s32 value)
141 { return 0; }
142 #endif
143
144 #ifdef CONFIG_PM_RUNTIME
145 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
146 void dev_pm_qos_hide_latency_limit(struct device *dev);
147 #else
dev_pm_qos_expose_latency_limit(struct device * dev,s32 value)148 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
149 { return 0; }
dev_pm_qos_hide_latency_limit(struct device * dev)150 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
151 #endif
152
153 #endif
154