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 <<
44 select CRYPTO_LZO <<
45 help 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 HIBERNATION_SNAPSHOT_DEV
84 bool "Userspace snapshot device" 84 bool "Userspace snapshot device"
85 depends on HIBERNATION 85 depends on HIBERNATION
86 default y 86 default y
87 help 87 help
88 Device used by the uswsusp tools. 88 Device used by the uswsusp tools.
89 89
90 Say N if no snapshotting from usersp 90 Say N if no snapshotting from userspace is needed, this also
91 reduces the attack surface of the ke 91 reduces the attack surface of the kernel.
92 92
93 If in doubt, say Y. 93 If in doubt, say Y.
94 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 95 config PM_STD_PARTITION
118 string "Default resume partition" 96 string "Default resume partition"
119 depends on HIBERNATION 97 depends on HIBERNATION
120 default "" 98 default ""
121 help 99 help
122 The default resume partition is the 100 The default resume partition is the partition that the suspend-
123 to-disk implementation will look for 101 to-disk implementation will look for a suspended disk image.
124 102
125 The partition specified here will be 103 The partition specified here will be different for almost every user.
126 It should be a valid swap partition 104 It should be a valid swap partition (at least for now) that is turned
127 on before suspending. 105 on before suspending.
128 106
129 The partition specified can be overr 107 The partition specified can be overridden by specifying:
130 108
131 resume=/dev/<other device> 109 resume=/dev/<other device>
132 110
133 which will set the resume partition 111 which will set the resume partition to the device specified.
134 112
135 Note there is currently not a way to 113 Note there is currently not a way to specify which device to save the
136 suspended image to. It will simply p 114 suspended image to. It will simply pick the first available swap
137 device. 115 device.
138 116
139 config PM_SLEEP 117 config PM_SLEEP
140 def_bool y 118 def_bool y
141 depends on SUSPEND || HIBERNATE_CALLBA 119 depends on SUSPEND || HIBERNATE_CALLBACKS
142 select PM 120 select PM
>> 121 select SRCU
143 122
144 config PM_SLEEP_SMP 123 config PM_SLEEP_SMP
145 def_bool y 124 def_bool y
146 depends on SMP 125 depends on SMP
147 depends on ARCH_SUSPEND_POSSIBLE || AR 126 depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
148 depends on PM_SLEEP 127 depends on PM_SLEEP
149 select HOTPLUG_CPU 128 select HOTPLUG_CPU
150 129
151 config PM_SLEEP_SMP_NONZERO_CPU 130 config PM_SLEEP_SMP_NONZERO_CPU
152 def_bool y 131 def_bool y
153 depends on PM_SLEEP_SMP 132 depends on PM_SLEEP_SMP
154 depends on ARCH_SUSPEND_NONZERO_CPU 133 depends on ARCH_SUSPEND_NONZERO_CPU
155 help 134 help
156 If an arch can suspend (for suspend, h 135 If an arch can suspend (for suspend, hibernate, kexec, etc) on a
157 non-zero numbered CPU, it may define A 136 non-zero numbered CPU, it may define ARCH_SUSPEND_NONZERO_CPU. This
158 will allow nohz_full mask to include C 137 will allow nohz_full mask to include CPU0.
159 138
160 config PM_AUTOSLEEP 139 config PM_AUTOSLEEP
161 bool "Opportunistic sleep" 140 bool "Opportunistic sleep"
162 depends on PM_SLEEP 141 depends on PM_SLEEP
163 help 142 help
164 Allow the kernel to trigger a system t 143 Allow the kernel to trigger a system transition into a global sleep
165 state automatically whenever there are 144 state automatically whenever there are no active wakeup sources.
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 <<
186 145
187 config PM_WAKELOCKS 146 config PM_WAKELOCKS
188 bool "User space wakeup sources interf 147 bool "User space wakeup sources interface"
189 depends on PM_SLEEP 148 depends on PM_SLEEP
190 help 149 help
191 Allow user space to create, activate a 150 Allow user space to create, activate and deactivate wakeup source
192 objects with the help of a sysfs-based 151 objects with the help of a sysfs-based interface.
193 152
194 config PM_WAKELOCKS_LIMIT 153 config PM_WAKELOCKS_LIMIT
195 int "Maximum number of user space wake 154 int "Maximum number of user space wakeup sources (0 = no limit)"
196 range 0 100000 155 range 0 100000
197 default 100 156 default 100
198 depends on PM_WAKELOCKS 157 depends on PM_WAKELOCKS
199 158
200 config PM_WAKELOCKS_GC 159 config PM_WAKELOCKS_GC
201 bool "Garbage collector for user space 160 bool "Garbage collector for user space wakeup sources"
202 depends on PM_WAKELOCKS 161 depends on PM_WAKELOCKS
203 default y 162 default y
204 163
205 config PM 164 config PM
206 bool "Device power management core fun 165 bool "Device power management core functionality"
207 help 166 help
208 Enable functionality allowing I/O de 167 Enable functionality allowing I/O devices to be put into energy-saving
209 (low power) states, for example afte 168 (low power) states, for example after a specified period of inactivity
210 (autosuspended), and woken up in res 169 (autosuspended), and woken up in response to a hardware-generated
211 wake-up event or a driver's request. 170 wake-up event or a driver's request.
212 171
213 Hardware support is generally requir 172 Hardware support is generally required for this functionality to work
214 and the bus type drivers of the buse 173 and the bus type drivers of the buses the devices are on are
215 responsible for the actual handling 174 responsible for the actual handling of device suspend requests and
216 wake-up events. 175 wake-up events.
217 176
218 config PM_DEBUG 177 config PM_DEBUG
219 bool "Power Management Debug Support" 178 bool "Power Management Debug Support"
220 depends on PM 179 depends on PM
221 help 180 help
222 This option enables various debugging 181 This option enables various debugging support in the Power Management
223 code. This is helpful when debugging a 182 code. This is helpful when debugging and reporting PM bugs, like
224 suspend support. 183 suspend support.
225 184
226 config PM_ADVANCED_DEBUG 185 config PM_ADVANCED_DEBUG
227 bool "Extra PM attributes in sysfs for 186 bool "Extra PM attributes in sysfs for low-level debugging/testing"
228 depends on PM_DEBUG 187 depends on PM_DEBUG
229 help 188 help
230 Add extra sysfs attributes allowing on 189 Add extra sysfs attributes allowing one to access some Power Management
231 fields of device objects from user spa 190 fields of device objects from user space. If you are not a kernel
232 developer interested in debugging/test 191 developer interested in debugging/testing Power Management, say "no".
233 192
234 config PM_TEST_SUSPEND 193 config PM_TEST_SUSPEND
235 bool "Test suspend/resume and wakealar 194 bool "Test suspend/resume and wakealarm during bootup"
236 depends on SUSPEND && PM_DEBUG && RTC_ 195 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
237 help 196 help
238 This option will let you suspend your 197 This option will let you suspend your machine during bootup, and
239 make it wake up a few seconds later us 198 make it wake up a few seconds later using an RTC wakeup alarm.
240 Enable this with a kernel parameter li 199 Enable this with a kernel parameter like "test_suspend=mem".
241 200
242 You probably want to have your system' 201 You probably want to have your system's RTC driver statically
243 linked, ensuring that it's available w 202 linked, ensuring that it's available when this test runs.
244 203
245 config PM_SLEEP_DEBUG 204 config PM_SLEEP_DEBUG
246 def_bool y 205 def_bool y
247 depends on PM_DEBUG && PM_SLEEP 206 depends on PM_DEBUG && PM_SLEEP
248 207
249 config DPM_WATCHDOG 208 config DPM_WATCHDOG
250 bool "Device suspend/resume watchdog" 209 bool "Device suspend/resume watchdog"
251 depends on PM_DEBUG && PSTORE && EXPER 210 depends on PM_DEBUG && PSTORE && EXPERT
252 help 211 help
253 Sets up a watchdog timer to capture 212 Sets up a watchdog timer to capture drivers that are
254 locked up attempting to suspend/resu 213 locked up attempting to suspend/resume a device.
255 A detected lockup causes system pani 214 A detected lockup causes system panic with message
256 captured in pstore device for inspec 215 captured in pstore device for inspection in subsequent
257 boot session. 216 boot session.
258 217
259 config DPM_WATCHDOG_TIMEOUT 218 config DPM_WATCHDOG_TIMEOUT
260 int "Watchdog timeout in seconds" 219 int "Watchdog timeout in seconds"
261 range 1 120 220 range 1 120
262 default 120 221 default 120
263 depends on DPM_WATCHDOG 222 depends on DPM_WATCHDOG
264 223
265 config PM_TRACE 224 config PM_TRACE
266 bool 225 bool
267 help 226 help
268 This enables code to save the last P 227 This enables code to save the last PM event point across
269 reboot. The architecture needs to su 228 reboot. The architecture needs to support this, x86 for
270 example does by saving things in the 229 example does by saving things in the RTC, see below.
271 230
272 The architecture specific code must 231 The architecture specific code must provide the extern
273 functions from <linux/resume-trace.h 232 functions from <linux/resume-trace.h> as well as the
274 <asm/resume-trace.h> header with a T 233 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
275 234
276 The way the information is presented 235 The way the information is presented is architecture-
277 dependent, x86 will print the inform 236 dependent, x86 will print the information during a
278 late_initcall. 237 late_initcall.
279 238
280 config PM_TRACE_RTC 239 config PM_TRACE_RTC
281 bool "Suspend/resume event tracing" 240 bool "Suspend/resume event tracing"
282 depends on PM_SLEEP_DEBUG 241 depends on PM_SLEEP_DEBUG
283 depends on X86 242 depends on X86
284 select PM_TRACE 243 select PM_TRACE
285 help 244 help
286 This enables some cheesy code to save 245 This enables some cheesy code to save the last PM event point in the
287 RTC across reboots, so that you can de 246 RTC across reboots, so that you can debug a machine that just hangs
288 during suspend (or more commonly, duri 247 during suspend (or more commonly, during resume).
289 248
290 To use this debugging feature you shou 249 To use this debugging feature you should attempt to suspend the
291 machine, reboot it and then run 250 machine, reboot it and then run
292 251
293 dmesg -s 1000000 | grep 'hash 252 dmesg -s 1000000 | grep 'hash matches'
294 253
295 CAUTION: this option will cause your m 254 CAUTION: this option will cause your machine's real-time clock to be
296 set to an invalid time after a resume. 255 set to an invalid time after a resume.
297 256
298 config APM_EMULATION 257 config APM_EMULATION
299 tristate "Advanced Power Management Em 258 tristate "Advanced Power Management Emulation"
300 depends on SYS_SUPPORTS_APM_EMULATION 259 depends on SYS_SUPPORTS_APM_EMULATION
301 help 260 help
302 APM is a BIOS specification for savi 261 APM is a BIOS specification for saving power using several different
303 techniques. This is mostly useful fo 262 techniques. This is mostly useful for battery powered laptops with
304 APM compliant BIOSes. If you say Y h 263 APM compliant BIOSes. If you say Y here, the system time will be
305 reset after a RESUME operation, the 264 reset after a RESUME operation, the /proc/apm device will provide
306 battery status information, and user 265 battery status information, and user-space programs will receive
307 notification of APM "events" (e.g. b 266 notification of APM "events" (e.g. battery status change).
308 267
309 In order to use APM, you will need s 268 In order to use APM, you will need supporting software. For location
310 and more information, read <file:Doc 269 and more information, read <file:Documentation/power/apm-acpi.rst>
311 and the Battery Powered Linux mini-H 270 and the Battery Powered Linux mini-HOWTO, available from
312 <http://www.tldp.org/docs.html#howto 271 <http://www.tldp.org/docs.html#howto>.
313 272
314 This driver does not spin down disk 273 This driver does not spin down disk drives (see the hdparm(8)
315 manpage ("man 8 hdparm") for that), 274 manpage ("man 8 hdparm") for that), and it doesn't turn off
316 VESA-compliant "green" monitors. 275 VESA-compliant "green" monitors.
317 276
318 Generally, if you don't have a batte 277 Generally, if you don't have a battery in your machine, there isn't
319 much point in using this driver and 278 much point in using this driver and you should say N. If you get
320 random kernel OOPSes or reboots that 279 random kernel OOPSes or reboots that don't seem to be related to
321 anything, try disabling/enabling thi 280 anything, try disabling/enabling this option (or disabling/enabling
322 APM in your BIOS). 281 APM in your BIOS).
323 282
324 config PM_CLK 283 config PM_CLK
325 def_bool y 284 def_bool y
326 depends on PM && HAVE_CLK 285 depends on PM && HAVE_CLK
327 286
328 config PM_GENERIC_DOMAINS 287 config PM_GENERIC_DOMAINS
329 bool 288 bool
330 depends on PM 289 depends on PM
331 290
332 config WQ_POWER_EFFICIENT_DEFAULT 291 config WQ_POWER_EFFICIENT_DEFAULT
333 bool "Enable workqueue power-efficient 292 bool "Enable workqueue power-efficient mode by default"
334 depends on PM 293 depends on PM
335 help 294 help
336 Per-cpu workqueues are generally pre 295 Per-cpu workqueues are generally preferred because they show
337 better performance thanks to cache l 296 better performance thanks to cache locality; unfortunately,
338 per-cpu workqueues tend to be more p 297 per-cpu workqueues tend to be more power hungry than unbound
339 workqueues. 298 workqueues.
340 299
341 Enabling workqueue.power_efficient k 300 Enabling workqueue.power_efficient kernel parameter makes the
342 per-cpu workqueues which were observ 301 per-cpu workqueues which were observed to contribute
343 significantly to power consumption u 302 significantly to power consumption unbound, leading to measurably
344 lower power usage at the cost of sma 303 lower power usage at the cost of small performance overhead.
345 304
346 This config option determines whethe 305 This config option determines whether workqueue.power_efficient
347 is enabled by default. 306 is enabled by default.
348 307
349 If in doubt, say N. 308 If in doubt, say N.
350 309
351 config PM_GENERIC_DOMAINS_SLEEP 310 config PM_GENERIC_DOMAINS_SLEEP
352 def_bool y 311 def_bool y
353 depends on PM_SLEEP && PM_GENERIC_DOMA 312 depends on PM_SLEEP && PM_GENERIC_DOMAINS
354 313
355 config PM_GENERIC_DOMAINS_OF 314 config PM_GENERIC_DOMAINS_OF
356 def_bool y 315 def_bool y
357 depends on PM_GENERIC_DOMAINS && OF 316 depends on PM_GENERIC_DOMAINS && OF
358 317
359 config CPU_PM 318 config CPU_PM
360 bool 319 bool
361 320
362 config ENERGY_MODEL 321 config ENERGY_MODEL
363 bool "Energy Model for devices with DV 322 bool "Energy Model for devices with DVFS (CPUs, GPUs, etc)"
364 depends on SMP 323 depends on SMP
365 depends on CPU_FREQ 324 depends on CPU_FREQ
366 help 325 help
367 Several subsystems (thermal and/or t 326 Several subsystems (thermal and/or the task scheduler for example)
368 can leverage information about the e 327 can leverage information about the energy consumed by devices to
369 make smarter decisions. This config 328 make smarter decisions. This config option enables the framework
370 from which subsystems can access the 329 from which subsystems can access the energy models.
371 330
372 The exact usage of the energy model 331 The exact usage of the energy model is subsystem-dependent.
373 332
374 If in doubt, say N. 333 If in doubt, say N.
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