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 #define PM_QOS_DEFAULT_VALUE -1
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
30 struct pm_qos_request
{
31 struct plist_node node
;
33 struct delayed_work work
; /* for pm_qos_update_request_timeout */
36 struct dev_pm_qos_request
{
37 struct plist_node node
;
43 PM_QOS_MAX
, /* return the largest value */
44 PM_QOS_MIN
/* return the smallest value */
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
52 struct pm_qos_constraints
{
53 struct plist_head list
;
54 s32 target_value
; /* Do not change to 64 bit */
56 enum pm_qos_type type
;
57 struct blocking_notifier_head
*notifiers
;
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 */
67 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request
*req
)
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
,
76 void pm_qos_update_request(struct pm_qos_request
*req
,
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
);
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
);
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
,
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
);
106 static inline s32
__dev_pm_qos_read_value(struct device
*dev
)
108 static inline s32
dev_pm_qos_read_value(struct device
*dev
)
110 static inline int dev_pm_qos_add_request(struct device
*dev
,
111 struct dev_pm_qos_request
*req
,
114 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request
*req
,
117 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request
*req
)
119 static inline int dev_pm_qos_add_notifier(struct device
*dev
,
120 struct notifier_block
*notifier
)
122 static inline int dev_pm_qos_remove_notifier(struct device
*dev
,
123 struct notifier_block
*notifier
)
125 static inline int dev_pm_qos_add_global_notifier(
126 struct notifier_block
*notifier
)
128 static inline int dev_pm_qos_remove_global_notifier(
129 struct notifier_block
*notifier
)
131 static inline void dev_pm_qos_constraints_init(struct device
*dev
)
133 dev
->power
.power_state
= PMSG_ON
;
135 static inline void dev_pm_qos_constraints_destroy(struct device
*dev
)
137 dev
->power
.power_state
= PMSG_INVALID
;
139 static inline int dev_pm_qos_add_ancestor_request(struct device
*dev
,
140 struct dev_pm_qos_request
*req
, s32 value
)
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
);
148 static inline int dev_pm_qos_expose_latency_limit(struct device
*dev
, s32 value
)
150 static inline void dev_pm_qos_hide_latency_limit(struct device
*dev
) {}