1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PM_QOS_H
3 #define _LINUX_PM_QOS_H
4 /* interface for the pm_qos_power infrastructure of the linux kernel.
6 * Mark Gross <mgross@linux.intel.com>
8 #include <linux/plist.h>
9 #include <linux/notifier.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 PM_QOS_MEMORY_BANDWIDTH,
20 /* insert new class ID */
24 enum pm_qos_flags_status {
25 PM_QOS_FLAGS_UNDEFINED = -1,
31 #define PM_QOS_DEFAULT_VALUE (-1)
32 #define PM_QOS_LATENCY_ANY S32_MAX
33 #define PM_QOS_LATENCY_ANY_NS ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)
35 #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
36 #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
37 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
38 #define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
39 #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE PM_QOS_LATENCY_ANY
40 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY
41 #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS PM_QOS_LATENCY_ANY_NS
42 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
43 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
45 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
47 struct pm_qos_request {
48 struct plist_node node;
50 struct delayed_work work; /* for pm_qos_update_request_timeout */
53 struct pm_qos_flags_request {
54 struct list_head node;
55 s32 flags; /* Do not change to 64 bit */
58 enum dev_pm_qos_req_type {
59 DEV_PM_QOS_RESUME_LATENCY = 1,
60 DEV_PM_QOS_LATENCY_TOLERANCE,
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 */
77 PM_QOS_SUM /* return the sum */
81 * Note: The lockless read path depends on the CPU accessing target_value
82 * or effective_flags atomically. Atomic access is only guaranteed on all CPU
83 * types linux supports for 32 bit quantites
85 struct pm_qos_constraints {
86 struct plist_head list;
87 s32 target_value; /* Do not change to 64 bit */
89 s32 no_constraint_value;
90 enum pm_qos_type type;
91 struct blocking_notifier_head *notifiers;
95 struct list_head list;
96 s32 effective_flags; /* Do not change to 64 bit */
100 struct pm_qos_constraints resume_latency;
101 struct pm_qos_constraints latency_tolerance;
102 struct pm_qos_flags flags;
103 struct dev_pm_qos_request *resume_latency_req;
104 struct dev_pm_qos_request *latency_tolerance_req;
105 struct dev_pm_qos_request *flags_req;
108 /* Action requested to pm_qos_update_target */
109 enum pm_qos_req_action {
110 PM_QOS_ADD_REQ, /* Add a new request */
111 PM_QOS_UPDATE_REQ, /* Update an existing request */
112 PM_QOS_REMOVE_REQ /* Remove an existing request */
115 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
117 return req->dev != NULL;
120 int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
121 enum pm_qos_req_action action, int value);
122 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
123 struct pm_qos_flags_request *req,
124 enum pm_qos_req_action action, s32 val);
125 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
127 void pm_qos_update_request(struct pm_qos_request *req,
129 void pm_qos_update_request_timeout(struct pm_qos_request *req,
130 s32 new_value, unsigned long timeout_us);
131 void pm_qos_remove_request(struct pm_qos_request *req);
133 int pm_qos_request(int pm_qos_class);
134 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
135 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
136 int pm_qos_request_active(struct pm_qos_request *req);
137 s32 pm_qos_read_value(struct pm_qos_constraints *c);
140 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
141 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
142 s32 __dev_pm_qos_read_value(struct device *dev);
143 s32 dev_pm_qos_read_value(struct device *dev);
144 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
145 enum dev_pm_qos_req_type type, s32 value);
146 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
147 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
148 int dev_pm_qos_add_notifier(struct device *dev,
149 struct notifier_block *notifier);
150 int dev_pm_qos_remove_notifier(struct device *dev,
151 struct notifier_block *notifier);
152 void dev_pm_qos_constraints_init(struct device *dev);
153 void dev_pm_qos_constraints_destroy(struct device *dev);
154 int dev_pm_qos_add_ancestor_request(struct device *dev,
155 struct dev_pm_qos_request *req,
156 enum dev_pm_qos_req_type type, s32 value);
157 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
158 void dev_pm_qos_hide_latency_limit(struct device *dev);
159 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
160 void dev_pm_qos_hide_flags(struct device *dev);
161 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
162 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
163 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
164 int dev_pm_qos_expose_latency_tolerance(struct device *dev);
165 void dev_pm_qos_hide_latency_tolerance(struct device *dev);
167 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
169 return dev->power.qos->resume_latency_req->data.pnode.prio;
172 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
174 return dev->power.qos->flags_req->data.flr.flags;
177 static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
179 return IS_ERR_OR_NULL(dev->power.qos) ?
180 PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
181 pm_qos_read_value(&dev->power.qos->resume_latency);
184 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
186 { return PM_QOS_FLAGS_UNDEFINED; }
187 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
189 { return PM_QOS_FLAGS_UNDEFINED; }
190 static inline s32 __dev_pm_qos_read_value(struct device *dev)
191 { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
192 static inline s32 dev_pm_qos_read_value(struct device *dev)
193 { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
194 static inline int dev_pm_qos_add_request(struct device *dev,
195 struct dev_pm_qos_request *req,
196 enum dev_pm_qos_req_type type,
199 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
202 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
204 static inline int dev_pm_qos_add_notifier(struct device *dev,
205 struct notifier_block *notifier)
207 static inline int dev_pm_qos_remove_notifier(struct device *dev,
208 struct notifier_block *notifier)
210 static inline void dev_pm_qos_constraints_init(struct device *dev)
212 dev->power.power_state = PMSG_ON;
214 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
216 dev->power.power_state = PMSG_INVALID;
218 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
219 struct dev_pm_qos_request *req,
220 enum dev_pm_qos_req_type type,
223 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
225 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
226 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
228 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
229 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
231 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
232 { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
233 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
235 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
237 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
239 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
241 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
243 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
244 static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
246 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;