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1config SUSPEND
2 bool "Suspend to RAM and standby"
3 depends on ARCH_SUSPEND_POSSIBLE
4 default y
5 ---help---
6 Allow the system to enter sleep states in which main memory is
7 powered and thus its contents are preserved, such as the
8 suspend-to-RAM state (e.g. the ACPI S3 state).
9
10config SUSPEND_FREEZER
11 bool "Enable freezer for suspend to RAM/standby" \
12 if ARCH_WANTS_FREEZER_CONTROL || BROKEN
13 depends on SUSPEND
14 default y
15 help
16 This allows you to turn off the freezer for suspend. If this is
17 done, no tasks are frozen for suspend to RAM/standby.
18
19 Turning OFF this setting is NOT recommended! If in doubt, say Y.
20
21config HIBERNATE_CALLBACKS
22 bool
23
24config HIBERNATION
25 bool "Hibernation (aka 'suspend to disk')"
26 depends on SWAP && ARCH_HIBERNATION_POSSIBLE
27 select HIBERNATE_CALLBACKS
28 select LZO_COMPRESS
29 select LZO_DECOMPRESS
30 ---help---
31 Enable the suspend to disk (STD) functionality, which is usually
32 called "hibernation" in user interfaces. STD checkpoints the
33 system and powers it off; and restores that checkpoint on reboot.
34
35 You can suspend your machine with 'echo disk > /sys/power/state'
36 after placing resume=/dev/swappartition on the kernel command line
37 in your bootloader's configuration file.
38
39 Alternatively, you can use the additional userland tools available
40 from <http://suspend.sf.net>.
41
42 In principle it does not require ACPI or APM, although for example
43 ACPI will be used for the final steps when it is available. One
44 of the reasons to use software suspend is that the firmware hooks
45 for suspend states like suspend-to-RAM (STR) often don't work very
46 well with Linux.
47
48 It creates an image which is saved in your active swap. Upon the next
49 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
50 have it detect the saved image, restore memory state from it, and
51 continue to run as before. If you do not want the previous state to
52 be reloaded, then use the 'noresume' kernel command line argument.
53 Note, however, that fsck will be run on your filesystems and you will
54 need to run mkswap against the swap partition used for the suspend.
55
56 It also works with swap files to a limited extent (for details see
57 <file:Documentation/power/swsusp-and-swap-files.txt>).
58
59 Right now you may boot without resuming and resume later but in the
60 meantime you cannot use the swap partition(s)/file(s) involved in
61 suspending. Also in this case you must not use the filesystems
62 that were mounted before the suspend. In particular, you MUST NOT
63 MOUNT any journaled filesystems mounted before the suspend or they
64 will get corrupted in a nasty way.
65
66 For more information take a look at <file:Documentation/power/swsusp.txt>.
67
68config PM_STD_PARTITION
69 string "Default resume partition"
70 depends on HIBERNATION
71 default ""
72 ---help---
73 The default resume partition is the partition that the suspend-
74 to-disk implementation will look for a suspended disk image.
75
76 The partition specified here will be different for almost every user.
77 It should be a valid swap partition (at least for now) that is turned
78 on before suspending.
79
80 The partition specified can be overridden by specifying:
81
82 resume=/dev/<other device>
83
84 which will set the resume partition to the device specified.
85
86 Note there is currently not a way to specify which device to save the
87 suspended image to. It will simply pick the first available swap
88 device.
89
90config PM_SLEEP
91 def_bool y
92 depends on SUSPEND || HIBERNATE_CALLBACKS
93
94config PM_SLEEP_SMP
95 def_bool y
96 depends on SMP
97 depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
98 depends on PM_SLEEP
99 select HOTPLUG
100 select HOTPLUG_CPU
101
102config PM_RUNTIME
103 bool "Run-time PM core functionality"
104 depends on !IA64_HP_SIM
105 ---help---
106 Enable functionality allowing I/O devices to be put into energy-saving
107 (low power) states at run time (or autosuspended) after a specified
108 period of inactivity and woken up in response to a hardware-generated
109 wake-up event or a driver's request.
110
111 Hardware support is generally required for this functionality to work
112 and the bus type drivers of the buses the devices are on are
113 responsible for the actual handling of the autosuspend requests and
114 wake-up events.
115
116config PM
117 def_bool y
118 depends on PM_SLEEP || PM_RUNTIME
119
120config PM_DEBUG
121 bool "Power Management Debug Support"
122 depends on PM
123 ---help---
124 This option enables various debugging support in the Power Management
125 code. This is helpful when debugging and reporting PM bugs, like
126 suspend support.
127
128config PM_ADVANCED_DEBUG
129 bool "Extra PM attributes in sysfs for low-level debugging/testing"
130 depends on PM_DEBUG
131 ---help---
132 Add extra sysfs attributes allowing one to access some Power Management
133 fields of device objects from user space. If you are not a kernel
134 developer interested in debugging/testing Power Management, say "no".
135
136config PM_TEST_SUSPEND
137 bool "Test suspend/resume and wakealarm during bootup"
138 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
139 ---help---
140 This option will let you suspend your machine during bootup, and
141 make it wake up a few seconds later using an RTC wakeup alarm.
142 Enable this with a kernel parameter like "test_suspend=mem".
143
144 You probably want to have your system's RTC driver statically
145 linked, ensuring that it's available when this test runs.
146
147config CAN_PM_TRACE
148 def_bool y
149 depends on PM_DEBUG && PM_SLEEP
150
151config PM_TRACE
152 bool
153 help
154 This enables code to save the last PM event point across
155 reboot. The architecture needs to support this, x86 for
156 example does by saving things in the RTC, see below.
157
158 The architecture specific code must provide the extern
159 functions from <linux/resume-trace.h> as well as the
160 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
161
162 The way the information is presented is architecture-
163 dependent, x86 will print the information during a
164 late_initcall.
165
166config PM_TRACE_RTC
167 bool "Suspend/resume event tracing"
168 depends on CAN_PM_TRACE
169 depends on X86
170 select PM_TRACE
171 ---help---
172 This enables some cheesy code to save the last PM event point in the
173 RTC across reboots, so that you can debug a machine that just hangs
174 during suspend (or more commonly, during resume).
175
176 To use this debugging feature you should attempt to suspend the
177 machine, reboot it and then run
178
179 dmesg -s 1000000 | grep 'hash matches'
180
181 CAUTION: this option will cause your machine's real-time clock to be
182 set to an invalid time after a resume.
183
184config APM_EMULATION
185 tristate "Advanced Power Management Emulation"
186 depends on PM && SYS_SUPPORTS_APM_EMULATION
187 help
188 APM is a BIOS specification for saving power using several different
189 techniques. This is mostly useful for battery powered laptops with
190 APM compliant BIOSes. If you say Y here, the system time will be
191 reset after a RESUME operation, the /proc/apm device will provide
192 battery status information, and user-space programs will receive
193 notification of APM "events" (e.g. battery status change).
194
195 In order to use APM, you will need supporting software. For location
196 and more information, read <file:Documentation/power/apm-acpi.txt>
197 and the Battery Powered Linux mini-HOWTO, available from
198 <http://www.tldp.org/docs.html#howto>.
199
200 This driver does not spin down disk drives (see the hdparm(8)
201 manpage ("man 8 hdparm") for that), and it doesn't turn off
202 VESA-compliant "green" monitors.
203
204 Generally, if you don't have a battery in your machine, there isn't
205 much point in using this driver and you should say N. If you get
206 random kernel OOPSes or reboots that don't seem to be related to
207 anything, try disabling/enabling this option (or disabling/enabling
208 APM in your BIOS).
209
210config ARCH_HAS_OPP
211 bool
212
213config PM_OPP
214 bool "Operating Performance Point (OPP) Layer library"
215 depends on ARCH_HAS_OPP
216 ---help---
217 SOCs have a standard set of tuples consisting of frequency and
218 voltage pairs that the device will support per voltage domain. This
219 is called Operating Performance Point or OPP. The actual definitions
220 of OPP varies over silicon within the same family of devices.
221
222 OPP layer organizes the data internally using device pointers
223 representing individual voltage domains and provides SOC
224 implementations a ready to use framework to manage OPPs.
225 For more information, read <file:Documentation/power/opp.txt>
226
227config PM_CLK
228 def_bool y
229 depends on PM && HAVE_CLK
230
231config PM_GENERIC_DOMAINS
232 bool
233 depends on PM
234
235config PM_GENERIC_DOMAINS_RUNTIME
236 def_bool y
237 depends on PM_RUNTIME && PM_GENERIC_DOMAINS
1config SUSPEND
2 bool "Suspend to RAM and standby"
3 depends on ARCH_SUSPEND_POSSIBLE
4 default y
5 ---help---
6 Allow the system to enter sleep states in which main memory is
7 powered and thus its contents are preserved, such as the
8 suspend-to-RAM state (e.g. the ACPI S3 state).
9
10config SUSPEND_FREEZER
11 bool "Enable freezer for suspend to RAM/standby" \
12 if ARCH_WANTS_FREEZER_CONTROL || BROKEN
13 depends on SUSPEND
14 default y
15 help
16 This allows you to turn off the freezer for suspend. If this is
17 done, no tasks are frozen for suspend to RAM/standby.
18
19 Turning OFF this setting is NOT recommended! If in doubt, say Y.
20
21config SUSPEND_SKIP_SYNC
22 bool "Skip kernel's sys_sync() on suspend to RAM/standby"
23 depends on SUSPEND
24 depends on EXPERT
25 help
26 Skip the kernel sys_sync() before freezing user processes.
27 Some systems prefer not to pay this cost on every invocation
28 of suspend, or they are content with invoking sync() from
29 user-space before invoking suspend. Say Y if that's your case.
30
31config HIBERNATE_CALLBACKS
32 bool
33
34config HIBERNATION
35 bool "Hibernation (aka 'suspend to disk')"
36 depends on SWAP && ARCH_HIBERNATION_POSSIBLE
37 select HIBERNATE_CALLBACKS
38 select LZO_COMPRESS
39 select LZO_DECOMPRESS
40 select CRC32
41 ---help---
42 Enable the suspend to disk (STD) functionality, which is usually
43 called "hibernation" in user interfaces. STD checkpoints the
44 system and powers it off; and restores that checkpoint on reboot.
45
46 You can suspend your machine with 'echo disk > /sys/power/state'
47 after placing resume=/dev/swappartition on the kernel command line
48 in your bootloader's configuration file.
49
50 Alternatively, you can use the additional userland tools available
51 from <http://suspend.sf.net>.
52
53 In principle it does not require ACPI or APM, although for example
54 ACPI will be used for the final steps when it is available. One
55 of the reasons to use software suspend is that the firmware hooks
56 for suspend states like suspend-to-RAM (STR) often don't work very
57 well with Linux.
58
59 It creates an image which is saved in your active swap. Upon the next
60 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
61 have it detect the saved image, restore memory state from it, and
62 continue to run as before. If you do not want the previous state to
63 be reloaded, then use the 'noresume' kernel command line argument.
64 Note, however, that fsck will be run on your filesystems and you will
65 need to run mkswap against the swap partition used for the suspend.
66
67 It also works with swap files to a limited extent (for details see
68 <file:Documentation/power/swsusp-and-swap-files.txt>).
69
70 Right now you may boot without resuming and resume later but in the
71 meantime you cannot use the swap partition(s)/file(s) involved in
72 suspending. Also in this case you must not use the filesystems
73 that were mounted before the suspend. In particular, you MUST NOT
74 MOUNT any journaled filesystems mounted before the suspend or they
75 will get corrupted in a nasty way.
76
77 For more information take a look at <file:Documentation/power/swsusp.txt>.
78
79config ARCH_SAVE_PAGE_KEYS
80 bool
81
82config PM_STD_PARTITION
83 string "Default resume partition"
84 depends on HIBERNATION
85 default ""
86 ---help---
87 The default resume partition is the partition that the suspend-
88 to-disk implementation will look for a suspended disk image.
89
90 The partition specified here will be different for almost every user.
91 It should be a valid swap partition (at least for now) that is turned
92 on before suspending.
93
94 The partition specified can be overridden by specifying:
95
96 resume=/dev/<other device>
97
98 which will set the resume partition to the device specified.
99
100 Note there is currently not a way to specify which device to save the
101 suspended image to. It will simply pick the first available swap
102 device.
103
104config PM_SLEEP
105 def_bool y
106 depends on SUSPEND || HIBERNATE_CALLBACKS
107 select PM
108
109config PM_SLEEP_SMP
110 def_bool y
111 depends on SMP
112 depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
113 depends on PM_SLEEP
114 select HOTPLUG_CPU
115
116config PM_AUTOSLEEP
117 bool "Opportunistic sleep"
118 depends on PM_SLEEP
119 default n
120 ---help---
121 Allow the kernel to trigger a system transition into a global sleep
122 state automatically whenever there are no active wakeup sources.
123
124config PM_WAKELOCKS
125 bool "User space wakeup sources interface"
126 depends on PM_SLEEP
127 default n
128 ---help---
129 Allow user space to create, activate and deactivate wakeup source
130 objects with the help of a sysfs-based interface.
131
132config PM_WAKELOCKS_LIMIT
133 int "Maximum number of user space wakeup sources (0 = no limit)"
134 range 0 100000
135 default 100
136 depends on PM_WAKELOCKS
137
138config PM_WAKELOCKS_GC
139 bool "Garbage collector for user space wakeup sources"
140 depends on PM_WAKELOCKS
141 default y
142
143config PM
144 bool "Device power management core functionality"
145 ---help---
146 Enable functionality allowing I/O devices to be put into energy-saving
147 (low power) states, for example after a specified period of inactivity
148 (autosuspended), and woken up in response to a hardware-generated
149 wake-up event or a driver's request.
150
151 Hardware support is generally required for this functionality to work
152 and the bus type drivers of the buses the devices are on are
153 responsible for the actual handling of device suspend requests and
154 wake-up events.
155
156config PM_DEBUG
157 bool "Power Management Debug Support"
158 depends on PM
159 ---help---
160 This option enables various debugging support in the Power Management
161 code. This is helpful when debugging and reporting PM bugs, like
162 suspend support.
163
164config PM_ADVANCED_DEBUG
165 bool "Extra PM attributes in sysfs for low-level debugging/testing"
166 depends on PM_DEBUG
167 ---help---
168 Add extra sysfs attributes allowing one to access some Power Management
169 fields of device objects from user space. If you are not a kernel
170 developer interested in debugging/testing Power Management, say "no".
171
172config PM_TEST_SUSPEND
173 bool "Test suspend/resume and wakealarm during bootup"
174 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
175 ---help---
176 This option will let you suspend your machine during bootup, and
177 make it wake up a few seconds later using an RTC wakeup alarm.
178 Enable this with a kernel parameter like "test_suspend=mem".
179
180 You probably want to have your system's RTC driver statically
181 linked, ensuring that it's available when this test runs.
182
183config PM_SLEEP_DEBUG
184 def_bool y
185 depends on PM_DEBUG && PM_SLEEP
186
187config DPM_WATCHDOG
188 bool "Device suspend/resume watchdog"
189 depends on PM_DEBUG && PSTORE
190 ---help---
191 Sets up a watchdog timer to capture drivers that are
192 locked up attempting to suspend/resume a device.
193 A detected lockup causes system panic with message
194 captured in pstore device for inspection in subsequent
195 boot session.
196
197config DPM_WATCHDOG_TIMEOUT
198 int "Watchdog timeout in seconds"
199 range 1 120
200 default 60
201 depends on DPM_WATCHDOG
202
203config PM_TRACE
204 bool
205 help
206 This enables code to save the last PM event point across
207 reboot. The architecture needs to support this, x86 for
208 example does by saving things in the RTC, see below.
209
210 The architecture specific code must provide the extern
211 functions from <linux/resume-trace.h> as well as the
212 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
213
214 The way the information is presented is architecture-
215 dependent, x86 will print the information during a
216 late_initcall.
217
218config PM_TRACE_RTC
219 bool "Suspend/resume event tracing"
220 depends on PM_SLEEP_DEBUG
221 depends on X86
222 select PM_TRACE
223 ---help---
224 This enables some cheesy code to save the last PM event point in the
225 RTC across reboots, so that you can debug a machine that just hangs
226 during suspend (or more commonly, during resume).
227
228 To use this debugging feature you should attempt to suspend the
229 machine, reboot it and then run
230
231 dmesg -s 1000000 | grep 'hash matches'
232
233 CAUTION: this option will cause your machine's real-time clock to be
234 set to an invalid time after a resume.
235
236config APM_EMULATION
237 tristate "Advanced Power Management Emulation"
238 depends on SYS_SUPPORTS_APM_EMULATION
239 help
240 APM is a BIOS specification for saving power using several different
241 techniques. This is mostly useful for battery powered laptops with
242 APM compliant BIOSes. If you say Y here, the system time will be
243 reset after a RESUME operation, the /proc/apm device will provide
244 battery status information, and user-space programs will receive
245 notification of APM "events" (e.g. battery status change).
246
247 In order to use APM, you will need supporting software. For location
248 and more information, read <file:Documentation/power/apm-acpi.txt>
249 and the Battery Powered Linux mini-HOWTO, available from
250 <http://www.tldp.org/docs.html#howto>.
251
252 This driver does not spin down disk drives (see the hdparm(8)
253 manpage ("man 8 hdparm") for that), and it doesn't turn off
254 VESA-compliant "green" monitors.
255
256 Generally, if you don't have a battery in your machine, there isn't
257 much point in using this driver and you should say N. If you get
258 random kernel OOPSes or reboots that don't seem to be related to
259 anything, try disabling/enabling this option (or disabling/enabling
260 APM in your BIOS).
261
262config PM_OPP
263 bool
264 select SRCU
265 ---help---
266 SOCs have a standard set of tuples consisting of frequency and
267 voltage pairs that the device will support per voltage domain. This
268 is called Operating Performance Point or OPP. The actual definitions
269 of OPP varies over silicon within the same family of devices.
270
271 OPP layer organizes the data internally using device pointers
272 representing individual voltage domains and provides SOC
273 implementations a ready to use framework to manage OPPs.
274 For more information, read <file:Documentation/power/opp.txt>
275
276config PM_CLK
277 def_bool y
278 depends on PM && HAVE_CLK
279
280config PM_GENERIC_DOMAINS
281 bool
282 depends on PM
283
284config WQ_POWER_EFFICIENT_DEFAULT
285 bool "Enable workqueue power-efficient mode by default"
286 depends on PM
287 default n
288 help
289 Per-cpu workqueues are generally preferred because they show
290 better performance thanks to cache locality; unfortunately,
291 per-cpu workqueues tend to be more power hungry than unbound
292 workqueues.
293
294 Enabling workqueue.power_efficient kernel parameter makes the
295 per-cpu workqueues which were observed to contribute
296 significantly to power consumption unbound, leading to measurably
297 lower power usage at the cost of small performance overhead.
298
299 This config option determines whether workqueue.power_efficient
300 is enabled by default.
301
302 If in doubt, say N.
303
304config PM_GENERIC_DOMAINS_SLEEP
305 def_bool y
306 depends on PM_SLEEP && PM_GENERIC_DOMAINS
307
308config PM_GENERIC_DOMAINS_OF
309 def_bool y
310 depends on PM_GENERIC_DOMAINS && OF
311
312config CPU_PM
313 bool