1 # SPDX-License-Identifier: GPL-2.0-only <<
2 config SUSPEND 1 config SUSPEND
3 bool "Suspend to RAM and standby" 2 bool "Suspend to RAM and standby"
4 depends on ARCH_SUSPEND_POSSIBLE 3 depends on ARCH_SUSPEND_POSSIBLE
5 default y 4 default y
6 help !! 5 ---help---
7 Allow the system to enter sleep stat 6 Allow the system to enter sleep states in which main memory is
8 powered and thus its contents are pr 7 powered and thus its contents are preserved, such as the
9 suspend-to-RAM state (e.g. the ACPI 8 suspend-to-RAM state (e.g. the ACPI S3 state).
10 9
11 config SUSPEND_FREEZER 10 config SUSPEND_FREEZER
12 bool "Enable freezer for suspend to RA 11 bool "Enable freezer for suspend to RAM/standby" \
13 if ARCH_WANTS_FREEZER_CONTROL 12 if ARCH_WANTS_FREEZER_CONTROL || BROKEN
14 depends on SUSPEND 13 depends on SUSPEND
15 default y 14 default y
16 help 15 help
17 This allows you to turn off the free 16 This allows you to turn off the freezer for suspend. If this is
18 done, no tasks are frozen for suspen 17 done, no tasks are frozen for suspend to RAM/standby.
19 18
20 Turning OFF this setting is NOT reco 19 Turning OFF this setting is NOT recommended! If in doubt, say Y.
21 20
22 config SUSPEND_SKIP_SYNC 21 config SUSPEND_SKIP_SYNC
23 bool "Skip kernel's sys_sync() on susp 22 bool "Skip kernel's sys_sync() on suspend to RAM/standby"
24 depends on SUSPEND 23 depends on SUSPEND
25 depends on EXPERT 24 depends on EXPERT
26 help 25 help
27 Skip the kernel sys_sync() before fr 26 Skip the kernel sys_sync() before freezing user processes.
28 Some systems prefer not to pay this 27 Some systems prefer not to pay this cost on every invocation
29 of suspend, or they are content with 28 of suspend, or they are content with invoking sync() from
30 user-space before invoking suspend. !! 29 user-space before invoking suspend. Say Y if that's your case.
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 30
35 config HIBERNATE_CALLBACKS 31 config HIBERNATE_CALLBACKS
36 bool 32 bool
37 33
38 config HIBERNATION 34 config HIBERNATION
39 bool "Hibernation (aka 'suspend to dis 35 bool "Hibernation (aka 'suspend to disk')"
40 depends on SWAP && ARCH_HIBERNATION_PO 36 depends on SWAP && ARCH_HIBERNATION_POSSIBLE
41 select HIBERNATE_CALLBACKS 37 select HIBERNATE_CALLBACKS
>> 38 select LZO_COMPRESS
>> 39 select LZO_DECOMPRESS
42 select CRC32 40 select CRC32
43 select CRYPTO !! 41 ---help---
44 select CRYPTO_LZO <<
45 help <<
46 Enable the suspend to disk (STD) fun 42 Enable the suspend to disk (STD) functionality, which is usually
47 called "hibernation" in user interfa 43 called "hibernation" in user interfaces. STD checkpoints the
48 system and powers it off; and restor 44 system and powers it off; and restores that checkpoint on reboot.
49 45
50 You can suspend your machine with 'e 46 You can suspend your machine with 'echo disk > /sys/power/state'
51 after placing resume=/dev/swappartit 47 after placing resume=/dev/swappartition on the kernel command line
52 in your bootloader's configuration f 48 in your bootloader's configuration file.
53 49
54 Alternatively, you can use the addit 50 Alternatively, you can use the additional userland tools available
55 from <http://suspend.sf.net>. 51 from <http://suspend.sf.net>.
56 52
57 In principle it does not require ACP 53 In principle it does not require ACPI or APM, although for example
58 ACPI will be used for the final step 54 ACPI will be used for the final steps when it is available. One
59 of the reasons to use software suspe 55 of the reasons to use software suspend is that the firmware hooks
60 for suspend states like suspend-to-R 56 for suspend states like suspend-to-RAM (STR) often don't work very
61 well with Linux. 57 well with Linux.
62 58
63 It creates an image which is saved i 59 It creates an image which is saved in your active swap. Upon the next
64 boot, pass the 'resume=/dev/swappart 60 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
65 have it detect the saved image, rest 61 have it detect the saved image, restore memory state from it, and
66 continue to run as before. If you do 62 continue to run as before. If you do not want the previous state to
67 be reloaded, then use the 'noresume' 63 be reloaded, then use the 'noresume' kernel command line argument.
68 Note, however, that fsck will be run 64 Note, however, that fsck will be run on your filesystems and you will
69 need to run mkswap against the swap 65 need to run mkswap against the swap partition used for the suspend.
70 66
71 It also works with swap files to a l 67 It also works with swap files to a limited extent (for details see
72 <file:Documentation/power/swsusp-and !! 68 <file:Documentation/power/swsusp-and-swap-files.txt>).
73 69
74 Right now you may boot without resum 70 Right now you may boot without resuming and resume later but in the
75 meantime you cannot use the swap par 71 meantime you cannot use the swap partition(s)/file(s) involved in
76 suspending. Also in this case you m 72 suspending. Also in this case you must not use the filesystems
77 that were mounted before the suspend 73 that were mounted before the suspend. In particular, you MUST NOT
78 MOUNT any journaled filesystems moun 74 MOUNT any journaled filesystems mounted before the suspend or they
79 will get corrupted in a nasty way. 75 will get corrupted in a nasty way.
80 76
81 For more information take a look at !! 77 For more information take a look at <file:Documentation/power/swsusp.txt>.
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 78
100 config HIBERNATION_COMP_LZO !! 79 config ARCH_SAVE_PAGE_KEYS
101 bool "lzo" !! 80 bool
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 81
117 config PM_STD_PARTITION 82 config PM_STD_PARTITION
118 string "Default resume partition" 83 string "Default resume partition"
119 depends on HIBERNATION 84 depends on HIBERNATION
120 default "" 85 default ""
121 help !! 86 ---help---
122 The default resume partition is the 87 The default resume partition is the partition that the suspend-
123 to-disk implementation will look for !! 88 to-disk implementation will look for a suspended disk image.
124 89
125 The partition specified here will be !! 90 The partition specified here will be different for almost every user.
126 It should be a valid swap partition 91 It should be a valid swap partition (at least for now) that is turned
127 on before suspending. !! 92 on before suspending.
128 93
129 The partition specified can be overr 94 The partition specified can be overridden by specifying:
130 95
131 resume=/dev/<other device> !! 96 resume=/dev/<other device>
132 97
133 which will set the resume partition !! 98 which will set the resume partition to the device specified.
134 99
135 Note there is currently not a way to 100 Note there is currently not a way to specify which device to save the
136 suspended image to. It will simply p !! 101 suspended image to. It will simply pick the first available swap
137 device. 102 device.
138 103
139 config PM_SLEEP 104 config PM_SLEEP
140 def_bool y 105 def_bool y
141 depends on SUSPEND || HIBERNATE_CALLBA 106 depends on SUSPEND || HIBERNATE_CALLBACKS
142 select PM 107 select PM
>> 108 select SRCU
143 109
144 config PM_SLEEP_SMP 110 config PM_SLEEP_SMP
145 def_bool y 111 def_bool y
146 depends on SMP 112 depends on SMP
147 depends on ARCH_SUSPEND_POSSIBLE || AR 113 depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
148 depends on PM_SLEEP 114 depends on PM_SLEEP
149 select HOTPLUG_CPU 115 select HOTPLUG_CPU
150 116
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 117 config PM_AUTOSLEEP
161 bool "Opportunistic sleep" 118 bool "Opportunistic sleep"
162 depends on PM_SLEEP 119 depends on PM_SLEEP
163 help !! 120 default n
>> 121 ---help---
164 Allow the kernel to trigger a system t 122 Allow the kernel to trigger a system transition into a global sleep
165 state automatically whenever there are 123 state automatically whenever there are no active wakeup sources.
166 124
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 125 config PM_WAKELOCKS
188 bool "User space wakeup sources interf 126 bool "User space wakeup sources interface"
189 depends on PM_SLEEP 127 depends on PM_SLEEP
190 help !! 128 default n
>> 129 ---help---
191 Allow user space to create, activate a 130 Allow user space to create, activate and deactivate wakeup source
192 objects with the help of a sysfs-based 131 objects with the help of a sysfs-based interface.
193 132
194 config PM_WAKELOCKS_LIMIT 133 config PM_WAKELOCKS_LIMIT
195 int "Maximum number of user space wake 134 int "Maximum number of user space wakeup sources (0 = no limit)"
196 range 0 100000 135 range 0 100000
197 default 100 136 default 100
198 depends on PM_WAKELOCKS 137 depends on PM_WAKELOCKS
199 138
200 config PM_WAKELOCKS_GC 139 config PM_WAKELOCKS_GC
201 bool "Garbage collector for user space 140 bool "Garbage collector for user space wakeup sources"
202 depends on PM_WAKELOCKS 141 depends on PM_WAKELOCKS
203 default y 142 default y
204 143
205 config PM 144 config PM
206 bool "Device power management core fun 145 bool "Device power management core functionality"
207 help !! 146 ---help---
208 Enable functionality allowing I/O de 147 Enable functionality allowing I/O devices to be put into energy-saving
209 (low power) states, for example afte 148 (low power) states, for example after a specified period of inactivity
210 (autosuspended), and woken up in res 149 (autosuspended), and woken up in response to a hardware-generated
211 wake-up event or a driver's request. 150 wake-up event or a driver's request.
212 151
213 Hardware support is generally requir 152 Hardware support is generally required for this functionality to work
214 and the bus type drivers of the buse 153 and the bus type drivers of the buses the devices are on are
215 responsible for the actual handling 154 responsible for the actual handling of device suspend requests and
216 wake-up events. 155 wake-up events.
217 156
218 config PM_DEBUG 157 config PM_DEBUG
219 bool "Power Management Debug Support" 158 bool "Power Management Debug Support"
220 depends on PM 159 depends on PM
221 help !! 160 ---help---
222 This option enables various debugging 161 This option enables various debugging support in the Power Management
223 code. This is helpful when debugging a 162 code. This is helpful when debugging and reporting PM bugs, like
224 suspend support. 163 suspend support.
225 164
226 config PM_ADVANCED_DEBUG 165 config PM_ADVANCED_DEBUG
227 bool "Extra PM attributes in sysfs for 166 bool "Extra PM attributes in sysfs for low-level debugging/testing"
228 depends on PM_DEBUG 167 depends on PM_DEBUG
229 help !! 168 ---help---
230 Add extra sysfs attributes allowing on 169 Add extra sysfs attributes allowing one to access some Power Management
231 fields of device objects from user spa 170 fields of device objects from user space. If you are not a kernel
232 developer interested in debugging/test 171 developer interested in debugging/testing Power Management, say "no".
233 172
234 config PM_TEST_SUSPEND 173 config PM_TEST_SUSPEND
235 bool "Test suspend/resume and wakealar 174 bool "Test suspend/resume and wakealarm during bootup"
236 depends on SUSPEND && PM_DEBUG && RTC_ 175 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
237 help !! 176 ---help---
238 This option will let you suspend your 177 This option will let you suspend your machine during bootup, and
239 make it wake up a few seconds later us 178 make it wake up a few seconds later using an RTC wakeup alarm.
240 Enable this with a kernel parameter li 179 Enable this with a kernel parameter like "test_suspend=mem".
241 180
242 You probably want to have your system' 181 You probably want to have your system's RTC driver statically
243 linked, ensuring that it's available w 182 linked, ensuring that it's available when this test runs.
244 183
245 config PM_SLEEP_DEBUG 184 config PM_SLEEP_DEBUG
246 def_bool y 185 def_bool y
247 depends on PM_DEBUG && PM_SLEEP 186 depends on PM_DEBUG && PM_SLEEP
248 187
249 config DPM_WATCHDOG 188 config DPM_WATCHDOG
250 bool "Device suspend/resume watchdog" 189 bool "Device suspend/resume watchdog"
251 depends on PM_DEBUG && PSTORE && EXPER 190 depends on PM_DEBUG && PSTORE && EXPERT
252 help !! 191 ---help---
253 Sets up a watchdog timer to capture 192 Sets up a watchdog timer to capture drivers that are
254 locked up attempting to suspend/resu 193 locked up attempting to suspend/resume a device.
255 A detected lockup causes system pani 194 A detected lockup causes system panic with message
256 captured in pstore device for inspec 195 captured in pstore device for inspection in subsequent
257 boot session. 196 boot session.
258 197
259 config DPM_WATCHDOG_TIMEOUT 198 config DPM_WATCHDOG_TIMEOUT
260 int "Watchdog timeout in seconds" 199 int "Watchdog timeout in seconds"
261 range 1 120 200 range 1 120
262 default 120 201 default 120
263 depends on DPM_WATCHDOG 202 depends on DPM_WATCHDOG
264 203
265 config PM_TRACE 204 config PM_TRACE
266 bool 205 bool
267 help 206 help
268 This enables code to save the last P 207 This enables code to save the last PM event point across
269 reboot. The architecture needs to su 208 reboot. The architecture needs to support this, x86 for
270 example does by saving things in the 209 example does by saving things in the RTC, see below.
271 210
272 The architecture specific code must 211 The architecture specific code must provide the extern
273 functions from <linux/resume-trace.h 212 functions from <linux/resume-trace.h> as well as the
274 <asm/resume-trace.h> header with a T 213 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
275 214
276 The way the information is presented 215 The way the information is presented is architecture-
277 dependent, x86 will print the inform 216 dependent, x86 will print the information during a
278 late_initcall. 217 late_initcall.
279 218
280 config PM_TRACE_RTC 219 config PM_TRACE_RTC
281 bool "Suspend/resume event tracing" 220 bool "Suspend/resume event tracing"
282 depends on PM_SLEEP_DEBUG 221 depends on PM_SLEEP_DEBUG
283 depends on X86 222 depends on X86
284 select PM_TRACE 223 select PM_TRACE
285 help !! 224 ---help---
286 This enables some cheesy code to save 225 This enables some cheesy code to save the last PM event point in the
287 RTC across reboots, so that you can de 226 RTC across reboots, so that you can debug a machine that just hangs
288 during suspend (or more commonly, duri 227 during suspend (or more commonly, during resume).
289 228
290 To use this debugging feature you shou 229 To use this debugging feature you should attempt to suspend the
291 machine, reboot it and then run 230 machine, reboot it and then run
292 231
293 dmesg -s 1000000 | grep 'hash 232 dmesg -s 1000000 | grep 'hash matches'
294 233
295 CAUTION: this option will cause your m 234 CAUTION: this option will cause your machine's real-time clock to be
296 set to an invalid time after a resume. 235 set to an invalid time after a resume.
297 236
298 config APM_EMULATION 237 config APM_EMULATION
299 tristate "Advanced Power Management Em 238 tristate "Advanced Power Management Emulation"
300 depends on SYS_SUPPORTS_APM_EMULATION 239 depends on SYS_SUPPORTS_APM_EMULATION
301 help 240 help
302 APM is a BIOS specification for savi 241 APM is a BIOS specification for saving power using several different
303 techniques. This is mostly useful fo 242 techniques. This is mostly useful for battery powered laptops with
304 APM compliant BIOSes. If you say Y h 243 APM compliant BIOSes. If you say Y here, the system time will be
305 reset after a RESUME operation, the 244 reset after a RESUME operation, the /proc/apm device will provide
306 battery status information, and user 245 battery status information, and user-space programs will receive
307 notification of APM "events" (e.g. b 246 notification of APM "events" (e.g. battery status change).
308 247
309 In order to use APM, you will need s 248 In order to use APM, you will need supporting software. For location
310 and more information, read <file:Doc !! 249 and more information, read <file:Documentation/power/apm-acpi.txt>
311 and the Battery Powered Linux mini-H 250 and the Battery Powered Linux mini-HOWTO, available from
312 <http://www.tldp.org/docs.html#howto 251 <http://www.tldp.org/docs.html#howto>.
313 252
314 This driver does not spin down disk 253 This driver does not spin down disk drives (see the hdparm(8)
315 manpage ("man 8 hdparm") for that), 254 manpage ("man 8 hdparm") for that), and it doesn't turn off
316 VESA-compliant "green" monitors. 255 VESA-compliant "green" monitors.
317 256
318 Generally, if you don't have a batte 257 Generally, if you don't have a battery in your machine, there isn't
319 much point in using this driver and 258 much point in using this driver and you should say N. If you get
320 random kernel OOPSes or reboots that 259 random kernel OOPSes or reboots that don't seem to be related to
321 anything, try disabling/enabling thi 260 anything, try disabling/enabling this option (or disabling/enabling
322 APM in your BIOS). 261 APM in your BIOS).
323 262
324 config PM_CLK 263 config PM_CLK
325 def_bool y 264 def_bool y
326 depends on PM && HAVE_CLK 265 depends on PM && HAVE_CLK
327 266
328 config PM_GENERIC_DOMAINS 267 config PM_GENERIC_DOMAINS
329 bool 268 bool
330 depends on PM 269 depends on PM
331 270
332 config WQ_POWER_EFFICIENT_DEFAULT 271 config WQ_POWER_EFFICIENT_DEFAULT
333 bool "Enable workqueue power-efficient 272 bool "Enable workqueue power-efficient mode by default"
334 depends on PM 273 depends on PM
>> 274 default n
335 help 275 help
336 Per-cpu workqueues are generally pre 276 Per-cpu workqueues are generally preferred because they show
337 better performance thanks to cache l 277 better performance thanks to cache locality; unfortunately,
338 per-cpu workqueues tend to be more p 278 per-cpu workqueues tend to be more power hungry than unbound
339 workqueues. 279 workqueues.
340 280
341 Enabling workqueue.power_efficient k 281 Enabling workqueue.power_efficient kernel parameter makes the
342 per-cpu workqueues which were observ 282 per-cpu workqueues which were observed to contribute
343 significantly to power consumption u 283 significantly to power consumption unbound, leading to measurably
344 lower power usage at the cost of sma 284 lower power usage at the cost of small performance overhead.
345 285
346 This config option determines whethe 286 This config option determines whether workqueue.power_efficient
347 is enabled by default. 287 is enabled by default.
348 288
349 If in doubt, say N. 289 If in doubt, say N.
350 290
351 config PM_GENERIC_DOMAINS_SLEEP 291 config PM_GENERIC_DOMAINS_SLEEP
352 def_bool y 292 def_bool y
353 depends on PM_SLEEP && PM_GENERIC_DOMA 293 depends on PM_SLEEP && PM_GENERIC_DOMAINS
354 294
355 config PM_GENERIC_DOMAINS_OF 295 config PM_GENERIC_DOMAINS_OF
356 def_bool y 296 def_bool y
357 depends on PM_GENERIC_DOMAINS && OF 297 depends on PM_GENERIC_DOMAINS && OF
358 298
359 config CPU_PM 299 config CPU_PM
360 bool 300 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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