1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config SUSPEND 2 config SUSPEND
3 bool "Suspend to RAM and standby" 3 bool "Suspend to RAM and standby"
4 depends on ARCH_SUSPEND_POSSIBLE 4 depends on ARCH_SUSPEND_POSSIBLE
5 default y 5 default y
6 help !! 6 ---help---
7 Allow the system to enter sleep stat 7 Allow the system to enter sleep states in which main memory is
8 powered and thus its contents are pr 8 powered and thus its contents are preserved, such as the
9 suspend-to-RAM state (e.g. the ACPI 9 suspend-to-RAM state (e.g. the ACPI S3 state).
10 10
11 config SUSPEND_FREEZER 11 config SUSPEND_FREEZER
12 bool "Enable freezer for suspend to RA 12 bool "Enable freezer for suspend to RAM/standby" \
13 if ARCH_WANTS_FREEZER_CONTROL 13 if ARCH_WANTS_FREEZER_CONTROL || BROKEN
14 depends on SUSPEND 14 depends on SUSPEND
15 default y 15 default y
16 help 16 help
17 This allows you to turn off the free 17 This allows you to turn off the freezer for suspend. If this is
18 done, no tasks are frozen for suspen 18 done, no tasks are frozen for suspend to RAM/standby.
19 19
20 Turning OFF this setting is NOT reco 20 Turning OFF this setting is NOT recommended! If in doubt, say Y.
21 21
22 config SUSPEND_SKIP_SYNC 22 config SUSPEND_SKIP_SYNC
23 bool "Skip kernel's sys_sync() on susp 23 bool "Skip kernel's sys_sync() on suspend to RAM/standby"
24 depends on SUSPEND 24 depends on SUSPEND
25 depends on EXPERT 25 depends on EXPERT
26 help 26 help
27 Skip the kernel sys_sync() before fr 27 Skip the kernel sys_sync() before freezing user processes.
28 Some systems prefer not to pay this 28 Some systems prefer not to pay this cost on every invocation
29 of suspend, or they are content with 29 of suspend, or they are content with invoking sync() from
30 user-space before invoking suspend. 30 user-space before invoking suspend. There's a run-time switch
31 at '/sys/power/sync_on_suspend' to c 31 at '/sys/power/sync_on_suspend' to configure this behaviour.
32 This setting changes the default for 32 This setting changes the default for the run-tim switch. Say Y
33 to change the default to disable the 33 to change the default to disable the kernel sys_sync().
34 34
35 config HIBERNATE_CALLBACKS 35 config HIBERNATE_CALLBACKS
36 bool 36 bool
37 37
38 config HIBERNATION 38 config HIBERNATION
39 bool "Hibernation (aka 'suspend to dis 39 bool "Hibernation (aka 'suspend to disk')"
40 depends on SWAP && ARCH_HIBERNATION_PO 40 depends on SWAP && ARCH_HIBERNATION_POSSIBLE
41 select HIBERNATE_CALLBACKS 41 select HIBERNATE_CALLBACKS
>> 42 select LZO_COMPRESS
>> 43 select LZO_DECOMPRESS
42 select CRC32 44 select CRC32
43 select CRYPTO !! 45 ---help---
44 select CRYPTO_LZO <<
45 help <<
46 Enable the suspend to disk (STD) fun 46 Enable the suspend to disk (STD) functionality, which is usually
47 called "hibernation" in user interfa 47 called "hibernation" in user interfaces. STD checkpoints the
48 system and powers it off; and restor 48 system and powers it off; and restores that checkpoint on reboot.
49 49
50 You can suspend your machine with 'e 50 You can suspend your machine with 'echo disk > /sys/power/state'
51 after placing resume=/dev/swappartit 51 after placing resume=/dev/swappartition on the kernel command line
52 in your bootloader's configuration f 52 in your bootloader's configuration file.
53 53
54 Alternatively, you can use the addit 54 Alternatively, you can use the additional userland tools available
55 from <http://suspend.sf.net>. 55 from <http://suspend.sf.net>.
56 56
57 In principle it does not require ACP 57 In principle it does not require ACPI or APM, although for example
58 ACPI will be used for the final step 58 ACPI will be used for the final steps when it is available. One
59 of the reasons to use software suspe 59 of the reasons to use software suspend is that the firmware hooks
60 for suspend states like suspend-to-R 60 for suspend states like suspend-to-RAM (STR) often don't work very
61 well with Linux. 61 well with Linux.
62 62
63 It creates an image which is saved i 63 It creates an image which is saved in your active swap. Upon the next
64 boot, pass the 'resume=/dev/swappart 64 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
65 have it detect the saved image, rest 65 have it detect the saved image, restore memory state from it, and
66 continue to run as before. If you do 66 continue to run as before. If you do not want the previous state to
67 be reloaded, then use the 'noresume' 67 be reloaded, then use the 'noresume' kernel command line argument.
68 Note, however, that fsck will be run 68 Note, however, that fsck will be run on your filesystems and you will
69 need to run mkswap against the swap 69 need to run mkswap against the swap partition used for the suspend.
70 70
71 It also works with swap files to a l 71 It also works with swap files to a limited extent (for details see
72 <file:Documentation/power/swsusp-and 72 <file:Documentation/power/swsusp-and-swap-files.rst>).
73 73
74 Right now you may boot without resum 74 Right now you may boot without resuming and resume later but in the
75 meantime you cannot use the swap par 75 meantime you cannot use the swap partition(s)/file(s) involved in
76 suspending. Also in this case you m 76 suspending. Also in this case you must not use the filesystems
77 that were mounted before the suspend 77 that were mounted before the suspend. In particular, you MUST NOT
78 MOUNT any journaled filesystems moun 78 MOUNT any journaled filesystems mounted before the suspend or they
79 will get corrupted in a nasty way. 79 will get corrupted in a nasty way.
80 80
81 For more information take a look at 81 For more information take a look at <file:Documentation/power/swsusp.rst>.
82 82
83 config HIBERNATION_SNAPSHOT_DEV !! 83 config ARCH_SAVE_PAGE_KEYS
84 bool "Userspace snapshot device" !! 84 bool
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 85
117 config PM_STD_PARTITION 86 config PM_STD_PARTITION
118 string "Default resume partition" 87 string "Default resume partition"
119 depends on HIBERNATION 88 depends on HIBERNATION
120 default "" 89 default ""
121 help !! 90 ---help---
122 The default resume partition is the 91 The default resume partition is the partition that the suspend-
123 to-disk implementation will look for !! 92 to-disk implementation will look for a suspended disk image.
124 93
125 The partition specified here will be !! 94 The partition specified here will be different for almost every user.
126 It should be a valid swap partition 95 It should be a valid swap partition (at least for now) that is turned
127 on before suspending. !! 96 on before suspending.
128 97
129 The partition specified can be overr 98 The partition specified can be overridden by specifying:
130 99
131 resume=/dev/<other device> !! 100 resume=/dev/<other device>
132 101
133 which will set the resume partition !! 102 which will set the resume partition to the device specified.
134 103
135 Note there is currently not a way to 104 Note there is currently not a way to specify which device to save the
136 suspended image to. It will simply p !! 105 suspended image to. It will simply pick the first available swap
137 device. 106 device.
138 107
139 config PM_SLEEP 108 config PM_SLEEP
140 def_bool y 109 def_bool y
141 depends on SUSPEND || HIBERNATE_CALLBA 110 depends on SUSPEND || HIBERNATE_CALLBACKS
142 select PM 111 select PM
>> 112 select SRCU
143 113
144 config PM_SLEEP_SMP 114 config PM_SLEEP_SMP
145 def_bool y 115 def_bool y
146 depends on SMP 116 depends on SMP
147 depends on ARCH_SUSPEND_POSSIBLE || AR 117 depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
148 depends on PM_SLEEP 118 depends on PM_SLEEP
149 select HOTPLUG_CPU 119 select HOTPLUG_CPU
150 120
151 config PM_SLEEP_SMP_NONZERO_CPU 121 config PM_SLEEP_SMP_NONZERO_CPU
152 def_bool y 122 def_bool y
153 depends on PM_SLEEP_SMP 123 depends on PM_SLEEP_SMP
154 depends on ARCH_SUSPEND_NONZERO_CPU 124 depends on ARCH_SUSPEND_NONZERO_CPU
155 help !! 125 ---help---
156 If an arch can suspend (for suspend, h 126 If an arch can suspend (for suspend, hibernate, kexec, etc) on a
157 non-zero numbered CPU, it may define A 127 non-zero numbered CPU, it may define ARCH_SUSPEND_NONZERO_CPU. This
158 will allow nohz_full mask to include C 128 will allow nohz_full mask to include CPU0.
159 129
160 config PM_AUTOSLEEP 130 config PM_AUTOSLEEP
161 bool "Opportunistic sleep" 131 bool "Opportunistic sleep"
162 depends on PM_SLEEP 132 depends on PM_SLEEP
163 help !! 133 default n
>> 134 ---help---
164 Allow the kernel to trigger a system t 135 Allow the kernel to trigger a system transition into a global sleep
165 state automatically whenever there are 136 state automatically whenever there are no active wakeup sources.
166 137
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 138 config PM_WAKELOCKS
188 bool "User space wakeup sources interf 139 bool "User space wakeup sources interface"
189 depends on PM_SLEEP 140 depends on PM_SLEEP
190 help !! 141 default n
>> 142 ---help---
191 Allow user space to create, activate a 143 Allow user space to create, activate and deactivate wakeup source
192 objects with the help of a sysfs-based 144 objects with the help of a sysfs-based interface.
193 145
194 config PM_WAKELOCKS_LIMIT 146 config PM_WAKELOCKS_LIMIT
195 int "Maximum number of user space wake 147 int "Maximum number of user space wakeup sources (0 = no limit)"
196 range 0 100000 148 range 0 100000
197 default 100 149 default 100
198 depends on PM_WAKELOCKS 150 depends on PM_WAKELOCKS
199 151
200 config PM_WAKELOCKS_GC 152 config PM_WAKELOCKS_GC
201 bool "Garbage collector for user space 153 bool "Garbage collector for user space wakeup sources"
202 depends on PM_WAKELOCKS 154 depends on PM_WAKELOCKS
203 default y 155 default y
204 156
205 config PM 157 config PM
206 bool "Device power management core fun 158 bool "Device power management core functionality"
207 help !! 159 ---help---
208 Enable functionality allowing I/O de 160 Enable functionality allowing I/O devices to be put into energy-saving
209 (low power) states, for example afte 161 (low power) states, for example after a specified period of inactivity
210 (autosuspended), and woken up in res 162 (autosuspended), and woken up in response to a hardware-generated
211 wake-up event or a driver's request. 163 wake-up event or a driver's request.
212 164
213 Hardware support is generally requir 165 Hardware support is generally required for this functionality to work
214 and the bus type drivers of the buse 166 and the bus type drivers of the buses the devices are on are
215 responsible for the actual handling 167 responsible for the actual handling of device suspend requests and
216 wake-up events. 168 wake-up events.
217 169
218 config PM_DEBUG 170 config PM_DEBUG
219 bool "Power Management Debug Support" 171 bool "Power Management Debug Support"
220 depends on PM 172 depends on PM
221 help !! 173 ---help---
222 This option enables various debugging 174 This option enables various debugging support in the Power Management
223 code. This is helpful when debugging a 175 code. This is helpful when debugging and reporting PM bugs, like
224 suspend support. 176 suspend support.
225 177
226 config PM_ADVANCED_DEBUG 178 config PM_ADVANCED_DEBUG
227 bool "Extra PM attributes in sysfs for 179 bool "Extra PM attributes in sysfs for low-level debugging/testing"
228 depends on PM_DEBUG 180 depends on PM_DEBUG
229 help !! 181 ---help---
230 Add extra sysfs attributes allowing on 182 Add extra sysfs attributes allowing one to access some Power Management
231 fields of device objects from user spa 183 fields of device objects from user space. If you are not a kernel
232 developer interested in debugging/test 184 developer interested in debugging/testing Power Management, say "no".
233 185
234 config PM_TEST_SUSPEND 186 config PM_TEST_SUSPEND
235 bool "Test suspend/resume and wakealar 187 bool "Test suspend/resume and wakealarm during bootup"
236 depends on SUSPEND && PM_DEBUG && RTC_ 188 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
237 help !! 189 ---help---
238 This option will let you suspend your 190 This option will let you suspend your machine during bootup, and
239 make it wake up a few seconds later us 191 make it wake up a few seconds later using an RTC wakeup alarm.
240 Enable this with a kernel parameter li 192 Enable this with a kernel parameter like "test_suspend=mem".
241 193
242 You probably want to have your system' 194 You probably want to have your system's RTC driver statically
243 linked, ensuring that it's available w 195 linked, ensuring that it's available when this test runs.
244 196
245 config PM_SLEEP_DEBUG 197 config PM_SLEEP_DEBUG
246 def_bool y 198 def_bool y
247 depends on PM_DEBUG && PM_SLEEP 199 depends on PM_DEBUG && PM_SLEEP
248 200
249 config DPM_WATCHDOG 201 config DPM_WATCHDOG
250 bool "Device suspend/resume watchdog" 202 bool "Device suspend/resume watchdog"
251 depends on PM_DEBUG && PSTORE && EXPER 203 depends on PM_DEBUG && PSTORE && EXPERT
252 help !! 204 ---help---
253 Sets up a watchdog timer to capture 205 Sets up a watchdog timer to capture drivers that are
254 locked up attempting to suspend/resu 206 locked up attempting to suspend/resume a device.
255 A detected lockup causes system pani 207 A detected lockup causes system panic with message
256 captured in pstore device for inspec 208 captured in pstore device for inspection in subsequent
257 boot session. 209 boot session.
258 210
259 config DPM_WATCHDOG_TIMEOUT 211 config DPM_WATCHDOG_TIMEOUT
260 int "Watchdog timeout in seconds" 212 int "Watchdog timeout in seconds"
261 range 1 120 213 range 1 120
262 default 120 214 default 120
263 depends on DPM_WATCHDOG 215 depends on DPM_WATCHDOG
264 216
265 config PM_TRACE 217 config PM_TRACE
266 bool 218 bool
267 help 219 help
268 This enables code to save the last P 220 This enables code to save the last PM event point across
269 reboot. The architecture needs to su 221 reboot. The architecture needs to support this, x86 for
270 example does by saving things in the 222 example does by saving things in the RTC, see below.
271 223
272 The architecture specific code must 224 The architecture specific code must provide the extern
273 functions from <linux/resume-trace.h 225 functions from <linux/resume-trace.h> as well as the
274 <asm/resume-trace.h> header with a T 226 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
275 227
276 The way the information is presented 228 The way the information is presented is architecture-
277 dependent, x86 will print the inform 229 dependent, x86 will print the information during a
278 late_initcall. 230 late_initcall.
279 231
280 config PM_TRACE_RTC 232 config PM_TRACE_RTC
281 bool "Suspend/resume event tracing" 233 bool "Suspend/resume event tracing"
282 depends on PM_SLEEP_DEBUG 234 depends on PM_SLEEP_DEBUG
283 depends on X86 235 depends on X86
284 select PM_TRACE 236 select PM_TRACE
285 help !! 237 ---help---
286 This enables some cheesy code to save 238 This enables some cheesy code to save the last PM event point in the
287 RTC across reboots, so that you can de 239 RTC across reboots, so that you can debug a machine that just hangs
288 during suspend (or more commonly, duri 240 during suspend (or more commonly, during resume).
289 241
290 To use this debugging feature you shou 242 To use this debugging feature you should attempt to suspend the
291 machine, reboot it and then run 243 machine, reboot it and then run
292 244
293 dmesg -s 1000000 | grep 'hash 245 dmesg -s 1000000 | grep 'hash matches'
294 246
295 CAUTION: this option will cause your m 247 CAUTION: this option will cause your machine's real-time clock to be
296 set to an invalid time after a resume. 248 set to an invalid time after a resume.
297 249
298 config APM_EMULATION 250 config APM_EMULATION
299 tristate "Advanced Power Management Em 251 tristate "Advanced Power Management Emulation"
300 depends on SYS_SUPPORTS_APM_EMULATION 252 depends on SYS_SUPPORTS_APM_EMULATION
301 help 253 help
302 APM is a BIOS specification for savi 254 APM is a BIOS specification for saving power using several different
303 techniques. This is mostly useful fo 255 techniques. This is mostly useful for battery powered laptops with
304 APM compliant BIOSes. If you say Y h 256 APM compliant BIOSes. If you say Y here, the system time will be
305 reset after a RESUME operation, the 257 reset after a RESUME operation, the /proc/apm device will provide
306 battery status information, and user 258 battery status information, and user-space programs will receive
307 notification of APM "events" (e.g. b 259 notification of APM "events" (e.g. battery status change).
308 260
309 In order to use APM, you will need s 261 In order to use APM, you will need supporting software. For location
310 and more information, read <file:Doc 262 and more information, read <file:Documentation/power/apm-acpi.rst>
311 and the Battery Powered Linux mini-H 263 and the Battery Powered Linux mini-HOWTO, available from
312 <http://www.tldp.org/docs.html#howto 264 <http://www.tldp.org/docs.html#howto>.
313 265
314 This driver does not spin down disk 266 This driver does not spin down disk drives (see the hdparm(8)
315 manpage ("man 8 hdparm") for that), 267 manpage ("man 8 hdparm") for that), and it doesn't turn off
316 VESA-compliant "green" monitors. 268 VESA-compliant "green" monitors.
317 269
318 Generally, if you don't have a batte 270 Generally, if you don't have a battery in your machine, there isn't
319 much point in using this driver and 271 much point in using this driver and you should say N. If you get
320 random kernel OOPSes or reboots that 272 random kernel OOPSes or reboots that don't seem to be related to
321 anything, try disabling/enabling thi 273 anything, try disabling/enabling this option (or disabling/enabling
322 APM in your BIOS). 274 APM in your BIOS).
323 275
324 config PM_CLK 276 config PM_CLK
325 def_bool y 277 def_bool y
326 depends on PM && HAVE_CLK 278 depends on PM && HAVE_CLK
327 279
328 config PM_GENERIC_DOMAINS 280 config PM_GENERIC_DOMAINS
329 bool 281 bool
330 depends on PM 282 depends on PM
331 283
332 config WQ_POWER_EFFICIENT_DEFAULT 284 config WQ_POWER_EFFICIENT_DEFAULT
333 bool "Enable workqueue power-efficient 285 bool "Enable workqueue power-efficient mode by default"
334 depends on PM 286 depends on PM
>> 287 default n
335 help 288 help
336 Per-cpu workqueues are generally pre 289 Per-cpu workqueues are generally preferred because they show
337 better performance thanks to cache l 290 better performance thanks to cache locality; unfortunately,
338 per-cpu workqueues tend to be more p 291 per-cpu workqueues tend to be more power hungry than unbound
339 workqueues. 292 workqueues.
340 293
341 Enabling workqueue.power_efficient k 294 Enabling workqueue.power_efficient kernel parameter makes the
342 per-cpu workqueues which were observ 295 per-cpu workqueues which were observed to contribute
343 significantly to power consumption u 296 significantly to power consumption unbound, leading to measurably
344 lower power usage at the cost of sma 297 lower power usage at the cost of small performance overhead.
345 298
346 This config option determines whethe 299 This config option determines whether workqueue.power_efficient
347 is enabled by default. 300 is enabled by default.
348 301
349 If in doubt, say N. 302 If in doubt, say N.
350 303
351 config PM_GENERIC_DOMAINS_SLEEP 304 config PM_GENERIC_DOMAINS_SLEEP
352 def_bool y 305 def_bool y
353 depends on PM_SLEEP && PM_GENERIC_DOMA 306 depends on PM_SLEEP && PM_GENERIC_DOMAINS
354 307
355 config PM_GENERIC_DOMAINS_OF 308 config PM_GENERIC_DOMAINS_OF
356 def_bool y 309 def_bool y
357 depends on PM_GENERIC_DOMAINS && OF 310 depends on PM_GENERIC_DOMAINS && OF
358 311
359 config CPU_PM 312 config CPU_PM
360 bool 313 bool
361 314
362 config ENERGY_MODEL 315 config ENERGY_MODEL
363 bool "Energy Model for devices with DV !! 316 bool "Energy Model for CPUs"
364 depends on SMP 317 depends on SMP
365 depends on CPU_FREQ 318 depends on CPU_FREQ
>> 319 default n
366 help 320 help
367 Several subsystems (thermal and/or t 321 Several subsystems (thermal and/or the task scheduler for example)
368 can leverage information about the e !! 322 can leverage information about the energy consumed by CPUs to make
369 make smarter decisions. This config !! 323 smarter decisions. This config option enables the framework from
370 from which subsystems can access the !! 324 which subsystems can access the energy models.
371 325
372 The exact usage of the energy model 326 The exact usage of the energy model is subsystem-dependent.
373 327
374 If in doubt, say N. 328 If in doubt, say N.
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