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>
12 #include <linux/cpumask.h>
13 #include <linux/interrupt.h>
17 PM_QOS_CPU_DMA_LATENCY,
18 PM_QOS_NETWORK_LATENCY,
19 PM_QOS_NETWORK_THROUGHPUT,
20 PM_QOS_MEMORY_BANDWIDTH,
22 /* insert new class ID */
26 enum pm_qos_flags_status {
27 PM_QOS_FLAGS_UNDEFINED = -1,
33 #define PM_QOS_DEFAULT_VALUE -1
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 0
40 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
41 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
42 #define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1))
44 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
45 #define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
47 enum pm_qos_req_type {
48 PM_QOS_REQ_ALL_CORES = 0,
49 PM_QOS_REQ_AFFINE_CORES,
51 PM_QOS_REQ_AFFINE_IRQ,
55 struct pm_qos_request {
56 enum pm_qos_req_type type;
57 struct cpumask cpus_affine;
60 /* Internal structure members */
61 struct irq_affinity_notify irq_notify;
63 struct plist_node node;
65 struct delayed_work work; /* for pm_qos_update_request_timeout */
68 struct pm_qos_flags_request {
69 struct list_head node;
70 s32 flags; /* Do not change to 64 bit */
73 enum dev_pm_qos_req_type {
74 DEV_PM_QOS_RESUME_LATENCY = 1,
75 DEV_PM_QOS_LATENCY_TOLERANCE,
79 struct dev_pm_qos_request {
80 enum dev_pm_qos_req_type type;
82 struct pm_qos_request lat;
83 struct pm_qos_flags_request flr;
90 PM_QOS_MAX, /* return the largest value */
91 PM_QOS_MIN, /* return the smallest value */
92 PM_QOS_SUM /* return the sum */
96 * Note: The lockless read path depends on the CPU accessing target_value
97 * or effective_flags atomically. Atomic access is only guaranteed on all CPU
98 * types linux supports for 32 bit quantites
100 struct pm_qos_constraints {
101 struct plist_head list;
102 s32 target_value; /* Do not change to 64 bit */
103 s32 target_per_cpu[NR_CPUS];
105 s32 no_constraint_value;
106 enum pm_qos_type type;
107 struct blocking_notifier_head *notifiers;
110 struct pm_qos_flags {
111 struct list_head list;
112 s32 effective_flags; /* Do not change to 64 bit */
116 struct pm_qos_constraints resume_latency;
117 struct pm_qos_constraints latency_tolerance;
118 struct pm_qos_flags flags;
119 struct dev_pm_qos_request *resume_latency_req;
120 struct dev_pm_qos_request *latency_tolerance_req;
121 struct dev_pm_qos_request *flags_req;
124 /* Action requested to pm_qos_update_target */
125 enum pm_qos_req_action {
126 PM_QOS_ADD_REQ, /* Add a new request */
127 PM_QOS_UPDATE_REQ, /* Update an existing request */
128 PM_QOS_REMOVE_REQ /* Remove an existing request */
131 static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
133 return req->dev != NULL;
136 int pm_qos_update_target(struct pm_qos_constraints *c,
137 struct pm_qos_request *req,
138 enum pm_qos_req_action action, int value);
139 bool pm_qos_update_flags(struct pm_qos_flags *pqf,
140 struct pm_qos_flags_request *req,
141 enum pm_qos_req_action action, s32 val);
142 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
144 void pm_qos_update_request(struct pm_qos_request *req,
146 void pm_qos_update_request_timeout(struct pm_qos_request *req,
147 s32 new_value, unsigned long timeout_us);
148 void pm_qos_remove_request(struct pm_qos_request *req);
150 int pm_qos_request(int pm_qos_class);
151 int pm_qos_request_for_cpu(int pm_qos_class, int cpu);
152 int pm_qos_request_for_cpumask(int pm_qos_class, struct cpumask *mask);
153 int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
154 int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
155 int pm_qos_request_active(struct pm_qos_request *req);
156 s32 pm_qos_read_value(struct pm_qos_constraints *c);
159 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
160 enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
161 s32 __dev_pm_qos_read_value(struct device *dev);
162 s32 dev_pm_qos_read_value(struct device *dev);
163 int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
164 enum dev_pm_qos_req_type type, s32 value);
165 int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
166 int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
167 int dev_pm_qos_add_notifier(struct device *dev,
168 struct notifier_block *notifier);
169 int dev_pm_qos_remove_notifier(struct device *dev,
170 struct notifier_block *notifier);
171 int dev_pm_qos_add_global_notifier(struct notifier_block *notifier);
172 int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
173 void dev_pm_qos_constraints_init(struct device *dev);
174 void dev_pm_qos_constraints_destroy(struct device *dev);
175 int dev_pm_qos_add_ancestor_request(struct device *dev,
176 struct dev_pm_qos_request *req,
177 enum dev_pm_qos_req_type type, s32 value);
178 int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
179 void dev_pm_qos_hide_latency_limit(struct device *dev);
180 int dev_pm_qos_expose_flags(struct device *dev, s32 value);
181 void dev_pm_qos_hide_flags(struct device *dev);
182 int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
183 s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
184 int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
185 int dev_pm_qos_expose_latency_tolerance(struct device *dev);
186 void dev_pm_qos_hide_latency_tolerance(struct device *dev);
188 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
190 return dev->power.qos->resume_latency_req->data.lat.node.prio;
193 static inline s32 dev_pm_qos_requested_flags(struct device *dev)
195 return dev->power.qos->flags_req->data.flr.flags;
198 static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
200 { return PM_QOS_FLAGS_UNDEFINED; }
201 static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
203 { return PM_QOS_FLAGS_UNDEFINED; }
204 static inline s32 __dev_pm_qos_read_value(struct device *dev)
206 static inline s32 dev_pm_qos_read_value(struct device *dev)
208 static inline int dev_pm_qos_add_request(struct device *dev,
209 struct dev_pm_qos_request *req,
210 enum dev_pm_qos_req_type type,
213 static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
216 static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
218 static inline int dev_pm_qos_add_notifier(struct device *dev,
219 struct notifier_block *notifier)
221 static inline int dev_pm_qos_remove_notifier(struct device *dev,
222 struct notifier_block *notifier)
224 static inline int dev_pm_qos_add_global_notifier(
225 struct notifier_block *notifier)
227 static inline int dev_pm_qos_remove_global_notifier(
228 struct notifier_block *notifier)
230 static inline void dev_pm_qos_constraints_init(struct device *dev)
232 dev->power.power_state = PMSG_ON;
234 static inline void dev_pm_qos_constraints_destroy(struct device *dev)
236 dev->power.power_state = PMSG_INVALID;
238 static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
239 struct dev_pm_qos_request *req,
240 enum dev_pm_qos_req_type type,
243 static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
245 static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
246 static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
248 static inline void dev_pm_qos_hide_flags(struct device *dev) {}
249 static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
251 static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
252 { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
253 static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
255 static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
257 static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
259 static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
260 static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }