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e8db0be1 JP |
1 | #ifndef _LINUX_PM_QOS_H |
2 | #define _LINUX_PM_QOS_H | |
d82b3518 MG |
3 | /* interface for the pm_qos_power infrastructure of the linux kernel. |
4 | * | |
bf1db69f | 5 | * Mark Gross <mgross@linux.intel.com> |
d82b3518 | 6 | */ |
82f68251 | 7 | #include <linux/plist.h> |
d82b3518 MG |
8 | #include <linux/notifier.h> |
9 | #include <linux/miscdevice.h> | |
1a9a9152 | 10 | #include <linux/device.h> |
d82b3518 | 11 | |
d031e1de AF |
12 | enum { |
13 | PM_QOS_RESERVED = 0, | |
14 | PM_QOS_CPU_DMA_LATENCY, | |
15 | PM_QOS_NETWORK_LATENCY, | |
16 | PM_QOS_NETWORK_THROUGHPUT, | |
17 | ||
18 | /* insert new class ID */ | |
19 | PM_QOS_NUM_CLASSES, | |
20 | }; | |
d82b3518 | 21 | |
d82b3518 MG |
22 | #define PM_QOS_DEFAULT_VALUE -1 |
23 | ||
333c5ae9 TC |
24 | #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC) |
25 | #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC) | |
26 | #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0 | |
91ff4cb8 | 27 | #define PM_QOS_DEV_LAT_DEFAULT_VALUE 0 |
333c5ae9 | 28 | |
cc749986 JP |
29 | struct pm_qos_request { |
30 | struct plist_node node; | |
82f68251 JB |
31 | int pm_qos_class; |
32 | }; | |
d82b3518 | 33 | |
91ff4cb8 JP |
34 | struct dev_pm_qos_request { |
35 | struct plist_node node; | |
36 | struct device *dev; | |
37 | }; | |
38 | ||
4e1779ba JP |
39 | enum pm_qos_type { |
40 | PM_QOS_UNITIALIZED, | |
41 | PM_QOS_MAX, /* return the largest value */ | |
42 | PM_QOS_MIN /* return the smallest value */ | |
43 | }; | |
44 | ||
45 | /* | |
46 | * Note: The lockless read path depends on the CPU accessing | |
47 | * target_value atomically. Atomic access is only guaranteed on all CPU | |
48 | * types linux supports for 32 bit quantites | |
49 | */ | |
50 | struct pm_qos_constraints { | |
51 | struct plist_head list; | |
52 | s32 target_value; /* Do not change to 64 bit */ | |
53 | s32 default_value; | |
54 | enum pm_qos_type type; | |
55 | struct blocking_notifier_head *notifiers; | |
56 | }; | |
57 | ||
abe98ec2 JP |
58 | /* Action requested to pm_qos_update_target */ |
59 | enum pm_qos_req_action { | |
60 | PM_QOS_ADD_REQ, /* Add a new request */ | |
61 | PM_QOS_UPDATE_REQ, /* Update an existing request */ | |
62 | PM_QOS_REMOVE_REQ /* Remove an existing request */ | |
63 | }; | |
64 | ||
91ff4cb8 JP |
65 | static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req) |
66 | { | |
67 | return req->dev != 0; | |
68 | } | |
69 | ||
abe98ec2 JP |
70 | int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node, |
71 | enum pm_qos_req_action action, int value); | |
cc749986 JP |
72 | void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class, |
73 | s32 value); | |
74 | void pm_qos_update_request(struct pm_qos_request *req, | |
e8db0be1 | 75 | s32 new_value); |
cc749986 | 76 | void pm_qos_remove_request(struct pm_qos_request *req); |
d82b3518 | 77 | |
ed77134b MG |
78 | int pm_qos_request(int pm_qos_class); |
79 | int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier); | |
80 | int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier); | |
cc749986 | 81 | int pm_qos_request_active(struct pm_qos_request *req); |
b66213cd | 82 | s32 pm_qos_read_value(struct pm_qos_constraints *c); |
91ff4cb8 | 83 | |
a9b542ee | 84 | #ifdef CONFIG_PM |
00dc9ad1 | 85 | s32 __dev_pm_qos_read_value(struct device *dev); |
1a9a9152 | 86 | s32 dev_pm_qos_read_value(struct device *dev); |
91ff4cb8 JP |
87 | int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, |
88 | s32 value); | |
89 | int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value); | |
90 | int dev_pm_qos_remove_request(struct dev_pm_qos_request *req); | |
91 | int dev_pm_qos_add_notifier(struct device *dev, | |
92 | struct notifier_block *notifier); | |
93 | int dev_pm_qos_remove_notifier(struct device *dev, | |
94 | struct notifier_block *notifier); | |
b66213cd JP |
95 | int dev_pm_qos_add_global_notifier(struct notifier_block *notifier); |
96 | int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier); | |
91ff4cb8 JP |
97 | void dev_pm_qos_constraints_init(struct device *dev); |
98 | void dev_pm_qos_constraints_destroy(struct device *dev); | |
40a5f8be RW |
99 | int dev_pm_qos_add_ancestor_request(struct device *dev, |
100 | struct dev_pm_qos_request *req, s32 value); | |
e8db0be1 | 101 | #else |
00dc9ad1 RW |
102 | static inline s32 __dev_pm_qos_read_value(struct device *dev) |
103 | { return 0; } | |
1a9a9152 RW |
104 | static inline s32 dev_pm_qos_read_value(struct device *dev) |
105 | { return 0; } | |
91ff4cb8 JP |
106 | static inline int dev_pm_qos_add_request(struct device *dev, |
107 | struct dev_pm_qos_request *req, | |
108 | s32 value) | |
109 | { return 0; } | |
110 | static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req, | |
111 | s32 new_value) | |
112 | { return 0; } | |
113 | static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req) | |
114 | { return 0; } | |
115 | static inline int dev_pm_qos_add_notifier(struct device *dev, | |
116 | struct notifier_block *notifier) | |
117 | { return 0; } | |
118 | static inline int dev_pm_qos_remove_notifier(struct device *dev, | |
119 | struct notifier_block *notifier) | |
120 | { return 0; } | |
b66213cd JP |
121 | static inline int dev_pm_qos_add_global_notifier( |
122 | struct notifier_block *notifier) | |
123 | { return 0; } | |
124 | static inline int dev_pm_qos_remove_global_notifier( | |
125 | struct notifier_block *notifier) | |
126 | { return 0; } | |
91ff4cb8 | 127 | static inline void dev_pm_qos_constraints_init(struct device *dev) |
1a9a9152 RW |
128 | { |
129 | dev->power.power_state = PMSG_ON; | |
130 | } | |
91ff4cb8 | 131 | static inline void dev_pm_qos_constraints_destroy(struct device *dev) |
1a9a9152 RW |
132 | { |
133 | dev->power.power_state = PMSG_INVALID; | |
134 | } | |
40a5f8be RW |
135 | static inline int dev_pm_qos_add_ancestor_request(struct device *dev, |
136 | struct dev_pm_qos_request *req, s32 value) | |
137 | { return 0; } | |
e8db0be1 | 138 | #endif |
d82b3518 | 139 | |
85dc0b8a RW |
140 | #ifdef CONFIG_PM_RUNTIME |
141 | int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value); | |
142 | void dev_pm_qos_hide_latency_limit(struct device *dev); | |
143 | #else | |
144 | static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) | |
145 | { return 0; } | |
146 | static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {} | |
147 | #endif | |
148 | ||
82f68251 | 149 | #endif |