FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
linux/kernel/cpu_pm.c at master · bufferoverflow/linux · GitHub
bufferoverflow
/
linux
Public
forked from
torvalds/linux
Notifications
You must be signed in to change notification settings
Fork
0
Star
0
Code
Pull requests
0
Actions
Projects
Security and quality
0
Insights
Additional navigation options
Code
Pull requests
Actions
Projects
Security and quality
Insights
Expand file tree
Breadcrumbs
linux
/
kernel
/
cpu_pm.c
Copy path
More file actions
More file actions
Latest commit
History
History
History
233 lines (204 loc) · 6.48 KB
Breadcrumbs
linux
/
kernel
/
cpu_pm.c
Copy path
File metadata and controls
233 lines (204 loc) · 6.48 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
/*
* Copyright (C) 2011 Google, Inc.
*
* Author:
* Colin Cross <ccross@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include
<linux/kernel.h>
#include
<linux/cpu_pm.h>
#include
<linux/module.h>
#include
<linux/notifier.h>
#include
<linux/spinlock.h>
#include
<linux/syscore_ops.h>
static
DEFINE_RWLOCK
(
cpu_pm_notifier_lock
);
static
RAW_NOTIFIER_HEAD
(
cpu_pm_notifier_chain
);
static
int
cpu_pm_notify
(
enum
cpu_pm_event
event
,
int
nr_to_call
,
int
*
nr_calls
)
{
int
ret
;
ret
=
__raw_notifier_call_chain
(
&
cpu_pm_notifier_chain
,
event
,
NULL
,
nr_to_call
,
nr_calls
);
return
notifier_to_errno
(
ret
);
}
/**
* cpu_pm_register_notifier - register a driver with cpu_pm
* @nb: notifier block to register
*
* Add a driver to a list of drivers that are notified about
* CPU and CPU cluster low power entry and exit.
*
* This function may sleep, and has the same return conditions as
* raw_notifier_chain_register.
*/
int
cpu_pm_register_notifier
(
struct
notifier_block
*
nb
)
{
unsigned long
flags
;
int
ret
;
write_lock_irqsave
(
&
cpu_pm_notifier_lock
,
flags
);
ret
=
raw_notifier_chain_register
(
&
cpu_pm_notifier_chain
,
nb
);
write_unlock_irqrestore
(
&
cpu_pm_notifier_lock
,
flags
);
return
ret
;
}
EXPORT_SYMBOL_GPL
(
cpu_pm_register_notifier
);
/**
* cpu_pm_unregister_notifier - unregister a driver with cpu_pm
* @nb: notifier block to be unregistered
*
* Remove a driver from the CPU PM notifier list.
*
* This function may sleep, and has the same return conditions as
* raw_notifier_chain_unregister.
*/
int
cpu_pm_unregister_notifier
(
struct
notifier_block
*
nb
)
{
unsigned long
flags
;
int
ret
;
write_lock_irqsave
(
&
cpu_pm_notifier_lock
,
flags
);
ret
=
raw_notifier_chain_unregister
(
&
cpu_pm_notifier_chain
,
nb
);
write_unlock_irqrestore
(
&
cpu_pm_notifier_lock
,
flags
);
return
ret
;
}
EXPORT_SYMBOL_GPL
(
cpu_pm_unregister_notifier
);
/**
* cpu_pm_enter - CPU low power entry notifier
*
* Notifies listeners that a single CPU is entering a low power state that may
* cause some blocks in the same power domain as the cpu to reset.
*
* Must be called on the affected CPU with interrupts disabled. Platform is
* responsible for ensuring that cpu_pm_enter is not called twice on the same
* CPU before cpu_pm_exit is called. Notified drivers can include VFP
* co-processor, interrupt controller and its PM extensions, local CPU
* timers context save/restore which shouldn't be interrupted. Hence it
* must be called with interrupts disabled.
*
* Return conditions are same as __raw_notifier_call_chain.
*/
int
cpu_pm_enter
(
void
)
{
int
nr_calls
;
int
ret
=
0
;
read_lock
(
&
cpu_pm_notifier_lock
);
ret
=
cpu_pm_notify
(
CPU_PM_ENTER
,
-1
,
&
nr_calls
);
if
(
ret
)
/*
* Inform listeners (nr_calls - 1) about failure of CPU PM
* PM entry who are notified earlier to prepare for it.
*/
cpu_pm_notify
(
CPU_PM_ENTER_FAILED
,
nr_calls
-
1
,
NULL
);
read_unlock
(
&
cpu_pm_notifier_lock
);
return
ret
;
}
EXPORT_SYMBOL_GPL
(
cpu_pm_enter
);
/**
* cpu_pm_exit - CPU low power exit notifier
*
* Notifies listeners that a single CPU is exiting a low power state that may
* have caused some blocks in the same power domain as the cpu to reset.
*
* Notified drivers can include VFP co-processor, interrupt controller
* and its PM extensions, local CPU timers context save/restore which
* shouldn't be interrupted. Hence it must be called with interrupts disabled.
*
* Return conditions are same as __raw_notifier_call_chain.
*/
int
cpu_pm_exit
(
void
)
{
int
ret
;
read_lock
(
&
cpu_pm_notifier_lock
);
ret
=
cpu_pm_notify
(
CPU_PM_EXIT
,
-1
,
NULL
);
read_unlock
(
&
cpu_pm_notifier_lock
);
return
ret
;
}
EXPORT_SYMBOL_GPL
(
cpu_pm_exit
);
/**
* cpu_cluster_pm_enter - CPU cluster low power entry notifier
*
* Notifies listeners that all cpus in a power domain are entering a low power
* state that may cause some blocks in the same power domain to reset.
*
* Must be called after cpu_pm_enter has been called on all cpus in the power
* domain, and before cpu_pm_exit has been called on any cpu in the power
* domain. Notified drivers can include VFP co-processor, interrupt controller
* and its PM extensions, local CPU timers context save/restore which
* shouldn't be interrupted. Hence it must be called with interrupts disabled.
*
* Must be called with interrupts disabled.
*
* Return conditions are same as __raw_notifier_call_chain.
*/
int
cpu_cluster_pm_enter
(
void
)
{
int
nr_calls
;
int
ret
=
0
;
read_lock
(
&
cpu_pm_notifier_lock
);
ret
=
cpu_pm_notify
(
CPU_CLUSTER_PM_ENTER
,
-1
,
&
nr_calls
);
if
(
ret
)
/*
* Inform listeners (nr_calls - 1) about failure of CPU cluster
* PM entry who are notified earlier to prepare for it.
*/
cpu_pm_notify
(
CPU_CLUSTER_PM_ENTER_FAILED
,
nr_calls
-
1
,
NULL
);
read_unlock
(
&
cpu_pm_notifier_lock
);
return
ret
;
}
EXPORT_SYMBOL_GPL
(
cpu_cluster_pm_enter
);
/**
* cpu_cluster_pm_exit - CPU cluster low power exit notifier
*
* Notifies listeners that all cpus in a power domain are exiting form a
* low power state that may have caused some blocks in the same power domain
* to reset.
*
* Must be called after cpu_pm_exit has been called on all cpus in the power
* domain, and before cpu_pm_exit has been called on any cpu in the power
* domain. Notified drivers can include VFP co-processor, interrupt controller
* and its PM extensions, local CPU timers context save/restore which
* shouldn't be interrupted. Hence it must be called with interrupts disabled.
*
* Return conditions are same as __raw_notifier_call_chain.
*/
int
cpu_cluster_pm_exit
(
void
)
{
int
ret
;
read_lock
(
&
cpu_pm_notifier_lock
);
ret
=
cpu_pm_notify
(
CPU_CLUSTER_PM_EXIT
,
-1
,
NULL
);
read_unlock
(
&
cpu_pm_notifier_lock
);
return
ret
;
}
EXPORT_SYMBOL_GPL
(
cpu_cluster_pm_exit
);
#ifdef
CONFIG_PM
static
int
cpu_pm_suspend
(
void
)
{
int
ret
;
ret
=
cpu_pm_enter
();
if
(
ret
)
return
ret
;
ret
=
cpu_cluster_pm_enter
();
return
ret
;
}
static
void
cpu_pm_resume
(
void
)
{
cpu_cluster_pm_exit
();
cpu_pm_exit
();
}
static
struct
syscore_ops
cpu_pm_syscore_ops
=
{
.
suspend
=
cpu_pm_suspend
,
.
resume
=
cpu_pm_resume
,
};
static
int
cpu_pm_init
(
void
)
{
register_syscore_ops
(
&
cpu_pm_syscore_ops
);
return
0
;
}
core_initcall
(
cpu_pm_init
);
#endif
Back
|
FazBrowse Home
|
New Git URL