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linux
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.
5 *
6 * Mark Gross <mgross@linux.intel.com>
7 */
8#include <linux/plist.h>
9#include <linux/notifier.h>
10#include <linux/device.h>
11#include <linux/workqueue.h>
12
13enum {
14 PM_QOS_RESERVED = 0,
15 PM_QOS_CPU_DMA_LATENCY,
16 PM_QOS_NETWORK_LATENCY,
17 PM_QOS_NETWORK_THROUGHPUT,
18 PM_QOS_MEMORY_BANDWIDTH,
19
20 /* insert new class ID */
21 PM_QOS_NUM_CLASSES,
22};
23
24enum pm_qos_flags_status {
25 PM_QOS_FLAGS_UNDEFINED = -1,
26 PM_QOS_FLAGS_NONE,
27 PM_QOS_FLAGS_SOME,
28 PM_QOS_FLAGS_ALL,
29};
30
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)
34
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)
44
45#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
46
47struct pm_qos_request {
48 struct plist_node node;
49 int pm_qos_class;
50 struct delayed_work work; /* for pm_qos_update_request_timeout */
51};
52
53struct pm_qos_flags_request {
54 struct list_head node;
55 s32 flags; /* Do not change to 64 bit */
56};
57
58enum dev_pm_qos_req_type {
59 DEV_PM_QOS_RESUME_LATENCY = 1,
60 DEV_PM_QOS_LATENCY_TOLERANCE,
61 DEV_PM_QOS_FLAGS,
62};
63
64struct dev_pm_qos_request {
65 enum dev_pm_qos_req_type type;
66 union {
67 struct plist_node pnode;
68 struct pm_qos_flags_request flr;
69 } data;
70 struct device *dev;
71};
72
73enum pm_qos_type {
74 PM_QOS_UNITIALIZED,
75 PM_QOS_MAX, /* return the largest value */
76 PM_QOS_MIN, /* return the smallest value */
77 PM_QOS_SUM /* return the sum */
78};
79
80/*
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
84 */
85struct pm_qos_constraints {
86 struct plist_head list;
87 s32 target_value; /* Do not change to 64 bit */
88 s32 default_value;
89 s32 no_constraint_value;
90 enum pm_qos_type type;
91 struct blocking_notifier_head *notifiers;
92};
93
94struct pm_qos_flags {
95 struct list_head list;
96 s32 effective_flags; /* Do not change to 64 bit */
97};
98
99struct dev_pm_qos {
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;
106};
107
108/* Action requested to pm_qos_update_target */
109enum 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 */
113};
114
115static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
116{
117 return req->dev != NULL;
118}
119
120int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
121 enum pm_qos_req_action action, int value);
122bool 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);
125void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
126 s32 value);
127void pm_qos_update_request(struct pm_qos_request *req,
128 s32 new_value);
129void pm_qos_update_request_timeout(struct pm_qos_request *req,
130 s32 new_value, unsigned long timeout_us);
131void pm_qos_remove_request(struct pm_qos_request *req);
132
133int pm_qos_request(int pm_qos_class);
134int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
135int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
136int pm_qos_request_active(struct pm_qos_request *req);
137s32 pm_qos_read_value(struct pm_qos_constraints *c);
138
139#ifdef CONFIG_PM
140enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
141enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
142s32 __dev_pm_qos_read_value(struct device *dev);
143s32 dev_pm_qos_read_value(struct device *dev);
144int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
145 enum dev_pm_qos_req_type type, s32 value);
146int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
147int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
148int dev_pm_qos_add_notifier(struct device *dev,
149 struct notifier_block *notifier);
150int dev_pm_qos_remove_notifier(struct device *dev,
151 struct notifier_block *notifier);
152void dev_pm_qos_constraints_init(struct device *dev);
153void dev_pm_qos_constraints_destroy(struct device *dev);
154int 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);
157int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
158void dev_pm_qos_hide_latency_limit(struct device *dev);
159int dev_pm_qos_expose_flags(struct device *dev, s32 value);
160void dev_pm_qos_hide_flags(struct device *dev);
161int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
162s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
163int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
164int dev_pm_qos_expose_latency_tolerance(struct device *dev);
165void dev_pm_qos_hide_latency_tolerance(struct device *dev);
166
167static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
168{
169 return dev->power.qos->resume_latency_req->data.pnode.prio;
170}
171
172static inline s32 dev_pm_qos_requested_flags(struct device *dev)
173{
174 return dev->power.qos->flags_req->data.flr.flags;
175}
176
177static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
178{
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);
182}
183#else
184static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
185 s32 mask)
186 { return PM_QOS_FLAGS_UNDEFINED; }
187static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
188 s32 mask)
189 { return PM_QOS_FLAGS_UNDEFINED; }
190static inline s32 __dev_pm_qos_read_value(struct device *dev)
191 { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
192static inline s32 dev_pm_qos_read_value(struct device *dev)
193 { return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
194static 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,
197 s32 value)
198 { return 0; }
199static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
200 s32 new_value)
201 { return 0; }
202static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
203 { return 0; }
204static inline int dev_pm_qos_add_notifier(struct device *dev,
205 struct notifier_block *notifier)
206 { return 0; }
207static inline int dev_pm_qos_remove_notifier(struct device *dev,
208 struct notifier_block *notifier)
209 { return 0; }
210static inline void dev_pm_qos_constraints_init(struct device *dev)
211{
212 dev->power.power_state = PMSG_ON;
213}
214static inline void dev_pm_qos_constraints_destroy(struct device *dev)
215{
216 dev->power.power_state = PMSG_INVALID;
217}
218static 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,
221 s32 value)
222 { return 0; }
223static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
224 { return 0; }
225static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
226static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
227 { return 0; }
228static inline void dev_pm_qos_hide_flags(struct device *dev) {}
229static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
230 { return 0; }
231static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
232 { return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
233static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
234 { return 0; }
235static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
236 { return 0; }
237static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
238
239static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
240{
241 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
242}
243static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
244static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
245{
246 return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
247}
248#endif
249
250#endif