1 # SPDX-License-Identifier: GPL-2.0-only
2 config SUSPEND
3 bool "Suspend to RAM and standby"
4 depends on ARCH_SUSPEND_POSSIBLE
5 default y
6 help
7 Allow the system to enter sleep stat
8 powered and thus its contents are pr
9 suspend-to-RAM state (e.g. the ACPI
10
11 config SUSPEND_FREEZER
12 bool "Enable freezer for suspend to RA
13 if ARCH_WANTS_FREEZER_CONTROL
14 depends on SUSPEND
15 default y
16 help
17 This allows you to turn off the free
18 done, no tasks are frozen for suspen
19
20 Turning OFF this setting is NOT reco
21
22 config SUSPEND_SKIP_SYNC
23 bool "Skip kernel's sys_sync() on susp
24 depends on SUSPEND
25 depends on EXPERT
26 help
27 Skip the kernel sys_sync() before fr
28 Some systems prefer not to pay this
29 of suspend, or they are content with
30 user-space before invoking suspend.
31 at '/sys/power/sync_on_suspend' to c
32 This setting changes the default for
33 to change the default to disable the
34
35 config HIBERNATE_CALLBACKS
36 bool
37
38 config HIBERNATION
39 bool "Hibernation (aka 'suspend to dis
40 depends on SWAP && ARCH_HIBERNATION_PO
41 select HIBERNATE_CALLBACKS
42 select CRC32
43 select CRYPTO
44 select CRYPTO_LZO
45 help
46 Enable the suspend to disk (STD) fun
47 called "hibernation" in user interfa
48 system and powers it off; and restor
49
50 You can suspend your machine with 'e
51 after placing resume=/dev/swappartit
52 in your bootloader's configuration f
53
54 Alternatively, you can use the addit
55 from <http://suspend.sf.net>.
56
57 In principle it does not require ACP
58 ACPI will be used for the final step
59 of the reasons to use software suspe
60 for suspend states like suspend-to-R
61 well with Linux.
62
63 It creates an image which is saved i
64 boot, pass the 'resume=/dev/swappart
65 have it detect the saved image, rest
66 continue to run as before. If you do
67 be reloaded, then use the 'noresume'
68 Note, however, that fsck will be run
69 need to run mkswap against the swap
70
71 It also works with swap files to a l
72 <file:Documentation/power/swsusp-and
73
74 Right now you may boot without resum
75 meantime you cannot use the swap par
76 suspending. Also in this case you m
77 that were mounted before the suspend
78 MOUNT any journaled filesystems moun
79 will get corrupted in a nasty way.
80
81 For more information take a look at
82
83 config HIBERNATION_SNAPSHOT_DEV
84 bool "Userspace snapshot device"
85 depends on HIBERNATION
86 default y
87 help
88 Device used by the uswsusp tools.
89
90 Say N if no snapshotting from usersp
91 reduces the attack surface of the ke
92
93 If in doubt, say Y.
94
95 choice
96 prompt "Default compressor"
97 default HIBERNATION_COMP_LZO
98 depends on HIBERNATION
99
100 config HIBERNATION_COMP_LZO
101 bool "lzo"
102 depends on CRYPTO_LZO
103
104 config HIBERNATION_COMP_LZ4
105 bool "lz4"
106 depends on CRYPTO_LZ4
107
108 endchoice
109
110 config HIBERNATION_DEF_COMP
111 string
112 default "lzo" if HIBERNATION_COMP_LZO
113 default "lz4" if HIBERNATION_COMP_LZ4
114 help
115 Default compressor to be used for hi
116
117 config PM_STD_PARTITION
118 string "Default resume partition"
119 depends on HIBERNATION
120 default ""
121 help
122 The default resume partition is the
123 to-disk implementation will look for
124
125 The partition specified here will be
126 It should be a valid swap partition
127 on before suspending.
128
129 The partition specified can be overr
130
131 resume=/dev/<other device>
132
133 which will set the resume partition
134
135 Note there is currently not a way to
136 suspended image to. It will simply p
137 device.
138
139 config PM_SLEEP
140 def_bool y
141 depends on SUSPEND || HIBERNATE_CALLBA
142 select PM
143
144 config PM_SLEEP_SMP
145 def_bool y
146 depends on SMP
147 depends on ARCH_SUSPEND_POSSIBLE || AR
148 depends on PM_SLEEP
149 select HOTPLUG_CPU
150
151 config PM_SLEEP_SMP_NONZERO_CPU
152 def_bool y
153 depends on PM_SLEEP_SMP
154 depends on ARCH_SUSPEND_NONZERO_CPU
155 help
156 If an arch can suspend (for suspend, h
157 non-zero numbered CPU, it may define A
158 will allow nohz_full mask to include C
159
160 config PM_AUTOSLEEP
161 bool "Opportunistic sleep"
162 depends on PM_SLEEP
163 help
164 Allow the kernel to trigger a system t
165 state automatically whenever there are
166
167 config PM_USERSPACE_AUTOSLEEP
168 bool "Userspace opportunistic sleep"
169 depends on PM_SLEEP
170 help
171 Notify kernel of aggressive userspace
172
173 This option changes the behavior of va
174 with frequent userspace-initiated tran
175
176 Saying Y here, disables code paths tha
177 enabled. In particular, only enable th
178 asleep/awake for very short periods of
179
180 Only platforms, such as Android, that
181 a userspace power manager service shou
182 other machines. Therefore, you should
183 extremely certain that this is what yo
184 bad, undesirable effects, and should n
185
186
187 config PM_WAKELOCKS
188 bool "User space wakeup sources interf
189 depends on PM_SLEEP
190 help
191 Allow user space to create, activate a
192 objects with the help of a sysfs-based
193
194 config PM_WAKELOCKS_LIMIT
195 int "Maximum number of user space wake
196 range 0 100000
197 default 100
198 depends on PM_WAKELOCKS
199
200 config PM_WAKELOCKS_GC
201 bool "Garbage collector for user space
202 depends on PM_WAKELOCKS
203 default y
204
205 config PM
206 bool "Device power management core fun
207 help
208 Enable functionality allowing I/O de
209 (low power) states, for example afte
210 (autosuspended), and woken up in res
211 wake-up event or a driver's request.
212
213 Hardware support is generally requir
214 and the bus type drivers of the buse
215 responsible for the actual handling
216 wake-up events.
217
218 config PM_DEBUG
219 bool "Power Management Debug Support"
220 depends on PM
221 help
222 This option enables various debugging
223 code. This is helpful when debugging a
224 suspend support.
225
226 config PM_ADVANCED_DEBUG
227 bool "Extra PM attributes in sysfs for
228 depends on PM_DEBUG
229 help
230 Add extra sysfs attributes allowing on
231 fields of device objects from user spa
232 developer interested in debugging/test
233
234 config PM_TEST_SUSPEND
235 bool "Test suspend/resume and wakealar
236 depends on SUSPEND && PM_DEBUG && RTC_
237 help
238 This option will let you suspend your
239 make it wake up a few seconds later us
240 Enable this with a kernel parameter li
241
242 You probably want to have your system'
243 linked, ensuring that it's available w
244
245 config PM_SLEEP_DEBUG
246 def_bool y
247 depends on PM_DEBUG && PM_SLEEP
248
249 config DPM_WATCHDOG
250 bool "Device suspend/resume watchdog"
251 depends on PM_DEBUG && PSTORE && EXPER
252 help
253 Sets up a watchdog timer to capture
254 locked up attempting to suspend/resu
255 A detected lockup causes system pani
256 captured in pstore device for inspec
257 boot session.
258
259 config DPM_WATCHDOG_TIMEOUT
260 int "Watchdog timeout in seconds"
261 range 1 120
262 default 120
263 depends on DPM_WATCHDOG
264
265 config PM_TRACE
266 bool
267 help
268 This enables code to save the last P
269 reboot. The architecture needs to su
270 example does by saving things in the
271
272 The architecture specific code must
273 functions from <linux/resume-trace.h
274 <asm/resume-trace.h> header with a T
275
276 The way the information is presented
277 dependent, x86 will print the inform
278 late_initcall.
279
280 config PM_TRACE_RTC
281 bool "Suspend/resume event tracing"
282 depends on PM_SLEEP_DEBUG
283 depends on X86
284 select PM_TRACE
285 help
286 This enables some cheesy code to save
287 RTC across reboots, so that you can de
288 during suspend (or more commonly, duri
289
290 To use this debugging feature you shou
291 machine, reboot it and then run
292
293 dmesg -s 1000000 | grep 'hash
294
295 CAUTION: this option will cause your m
296 set to an invalid time after a resume.
297
298 config APM_EMULATION
299 tristate "Advanced Power Management Em
300 depends on SYS_SUPPORTS_APM_EMULATION
301 help
302 APM is a BIOS specification for savi
303 techniques. This is mostly useful fo
304 APM compliant BIOSes. If you say Y h
305 reset after a RESUME operation, the
306 battery status information, and user
307 notification of APM "events" (e.g. b
308
309 In order to use APM, you will need s
310 and more information, read <file:Doc
311 and the Battery Powered Linux mini-H
312 <http://www.tldp.org/docs.html#howto
313
314 This driver does not spin down disk
315 manpage ("man 8 hdparm") for that),
316 VESA-compliant "green" monitors.
317
318 Generally, if you don't have a batte
319 much point in using this driver and
320 random kernel OOPSes or reboots that
321 anything, try disabling/enabling thi
322 APM in your BIOS).
323
324 config PM_CLK
325 def_bool y
326 depends on PM && HAVE_CLK
327
328 config PM_GENERIC_DOMAINS
329 bool
330 depends on PM
331
332 config WQ_POWER_EFFICIENT_DEFAULT
333 bool "Enable workqueue power-efficient
334 depends on PM
335 help
336 Per-cpu workqueues are generally pre
337 better performance thanks to cache l
338 per-cpu workqueues tend to be more p
339 workqueues.
340
341 Enabling workqueue.power_efficient k
342 per-cpu workqueues which were observ
343 significantly to power consumption u
344 lower power usage at the cost of sma
345
346 This config option determines whethe
347 is enabled by default.
348
349 If in doubt, say N.
350
351 config PM_GENERIC_DOMAINS_SLEEP
352 def_bool y
353 depends on PM_SLEEP && PM_GENERIC_DOMA
354
355 config PM_GENERIC_DOMAINS_OF
356 def_bool y
357 depends on PM_GENERIC_DOMAINS && OF
358
359 config CPU_PM
360 bool
361
362 config ENERGY_MODEL
363 bool "Energy Model for devices with DV
364 depends on SMP
365 depends on CPU_FREQ
366 help
367 Several subsystems (thermal and/or t
368 can leverage information about the e
369 make smarter decisions. This config
370 from which subsystems can access the
371
372 The exact usage of the energy model
373
374 If in doubt, say N.
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