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>
12 #define PM_QOS_RESERVED 0
13 #define PM_QOS_CPU_DMA_LATENCY 1
14 #define PM_QOS_NETWORK_LATENCY 2
15 #define PM_QOS_NETWORK_THROUGHPUT 3
17 #define PM_QOS_NUM_CLASSES 4
18 #define PM_QOS_DEFAULT_VALUE -1
20 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
21 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
22 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
23 #define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
25 struct pm_qos_request
{
26 struct plist_node node
;
30 struct dev_pm_qos_request
{
31 struct plist_node node
;
37 PM_QOS_MAX
, /* return the largest value */
38 PM_QOS_MIN
/* return the smallest value */
42 * Note: The lockless read path depends on the CPU accessing
43 * target_value atomically. Atomic access is only guaranteed on all CPU
44 * types linux supports for 32 bit quantites
46 struct pm_qos_constraints
{
47 struct plist_head list
;
48 s32 target_value
; /* Do not change to 64 bit */
50 enum pm_qos_type type
;
51 struct blocking_notifier_head
*notifiers
;
54 /* Action requested to pm_qos_update_target */
55 enum pm_qos_req_action
{
56 PM_QOS_ADD_REQ
, /* Add a new request */
57 PM_QOS_UPDATE_REQ
, /* Update an existing request */
58 PM_QOS_REMOVE_REQ
/* Remove an existing request */
61 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request
*req
)
67 int pm_qos_update_target(struct pm_qos_constraints
*c
, struct plist_node
*node
,
68 enum pm_qos_req_action action
, int value
);
69 void pm_qos_add_request(struct pm_qos_request
*req
, int pm_qos_class
,
71 void pm_qos_update_request(struct pm_qos_request
*req
,
73 void pm_qos_remove_request(struct pm_qos_request
*req
);
75 int pm_qos_request(int pm_qos_class
);
76 int pm_qos_add_notifier(int pm_qos_class
, struct notifier_block
*notifier
);
77 int pm_qos_remove_notifier(int pm_qos_class
, struct notifier_block
*notifier
);
78 int pm_qos_request_active(struct pm_qos_request
*req
);
79 s32
pm_qos_read_value(struct pm_qos_constraints
*c
);
81 s32
dev_pm_qos_read_value(struct device
*dev
);
82 int dev_pm_qos_add_request(struct device
*dev
, struct dev_pm_qos_request
*req
,
84 int dev_pm_qos_update_request(struct dev_pm_qos_request
*req
, s32 new_value
);
85 int dev_pm_qos_remove_request(struct dev_pm_qos_request
*req
);
86 int dev_pm_qos_add_notifier(struct device
*dev
,
87 struct notifier_block
*notifier
);
88 int dev_pm_qos_remove_notifier(struct device
*dev
,
89 struct notifier_block
*notifier
);
90 int dev_pm_qos_add_global_notifier(struct notifier_block
*notifier
);
91 int dev_pm_qos_remove_global_notifier(struct notifier_block
*notifier
);
92 void dev_pm_qos_constraints_init(struct device
*dev
);
93 void dev_pm_qos_constraints_destroy(struct device
*dev
);
95 static inline int pm_qos_update_target(struct pm_qos_constraints
*c
,
96 struct plist_node
*node
,
97 enum pm_qos_req_action action
,
100 static inline void pm_qos_add_request(struct pm_qos_request
*req
,
101 int pm_qos_class
, s32 value
)
103 static inline void pm_qos_update_request(struct pm_qos_request
*req
,
106 static inline void pm_qos_remove_request(struct pm_qos_request
*req
)
109 static inline int pm_qos_request(int pm_qos_class
)
111 static inline int pm_qos_add_notifier(int pm_qos_class
,
112 struct notifier_block
*notifier
)
114 static inline int pm_qos_remove_notifier(int pm_qos_class
,
115 struct notifier_block
*notifier
)
117 static inline int pm_qos_request_active(struct pm_qos_request
*req
)
119 static inline s32
pm_qos_read_value(struct pm_qos_constraints
*c
)
122 static inline s32
dev_pm_qos_read_value(struct device
*dev
)
124 static inline int dev_pm_qos_add_request(struct device
*dev
,
125 struct dev_pm_qos_request
*req
,
128 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request
*req
,
131 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request
*req
)
133 static inline int dev_pm_qos_add_notifier(struct device
*dev
,
134 struct notifier_block
*notifier
)
136 static inline int dev_pm_qos_remove_notifier(struct device
*dev
,
137 struct notifier_block
*notifier
)
139 static inline int dev_pm_qos_add_global_notifier(
140 struct notifier_block
*notifier
)
142 static inline int dev_pm_qos_remove_global_notifier(
143 struct notifier_block
*notifier
)
145 static inline void dev_pm_qos_constraints_init(struct device
*dev
)
147 dev
->power
.power_state
= PMSG_ON
;
149 static inline void dev_pm_qos_constraints_destroy(struct device
*dev
)
151 dev
->power
.power_state
= PMSG_INVALID
;
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