Commit | Line | Data |
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296699de RW |
1 | config SUSPEND |
2 | bool "Suspend to RAM and standby" | |
1eb208ae | 3 | depends on ARCH_SUSPEND_POSSIBLE |
296699de RW |
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 | |
f4cb5700 | 8 | suspend-to-RAM state (e.g. the ACPI S3 state). |
296699de | 9 | |
b28f5081 JB |
10 | config 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 | ||
2fd77fff LB |
21 | config 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 | ||
1f112cee RW |
31 | config HIBERNATE_CALLBACKS |
32 | bool | |
33 | ||
b0cb1a19 | 34 | config HIBERNATION |
296699de | 35 | bool "Hibernation (aka 'suspend to disk')" |
1eb208ae | 36 | depends on SWAP && ARCH_HIBERNATION_POSSIBLE |
1f112cee | 37 | select HIBERNATE_CALLBACKS |
f996fc96 BS |
38 | select LZO_COMPRESS |
39 | select LZO_DECOMPRESS | |
081a9d04 | 40 | select CRC32 |
1da177e4 | 41 | ---help--- |
a7ee2e5f DB |
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. | |
1da177e4 | 45 | |
23b168d4 PM |
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 | ||
c7276fde RW |
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 | |
a7ee2e5f DB |
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. | |
c7276fde RW |
58 | |
59 | It creates an image which is saved in your active swap. Upon the next | |
1da177e4 LT |
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 | |
c7276fde RW |
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. | |
1da177e4 | 66 | |
c7276fde RW |
67 | It also works with swap files to a limited extent (for details see |
68 | <file:Documentation/power/swsusp-and-swap-files.txt>). | |
1da177e4 | 69 | |
c7276fde RW |
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. | |
1da177e4 | 76 | |
c7276fde | 77 | For more information take a look at <file:Documentation/power/swsusp.txt>. |
471b40d0 | 78 | |
85055dd8 MS |
79 | config ARCH_SAVE_PAGE_KEYS |
80 | bool | |
81 | ||
1da177e4 LT |
82 | config PM_STD_PARTITION |
83 | string "Default resume partition" | |
b0cb1a19 | 84 | depends on HIBERNATION |
1da177e4 LT |
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 | ||
196ec243 | 104 | config PM_SLEEP |
cf4fb80c | 105 | def_bool y |
d419e4c0 | 106 | depends on SUSPEND || HIBERNATE_CALLBACKS |
464ed18e | 107 | select PM |
015156f5 | 108 | select SRCU |
196ec243 RW |
109 | |
110 | config PM_SLEEP_SMP | |
cf4fb80c | 111 | def_bool y |
196ec243 RW |
112 | depends on SMP |
113 | depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE | |
114 | depends on PM_SLEEP | |
196ec243 | 115 | select HOTPLUG_CPU |
196ec243 | 116 | |
7483b4a4 RW |
117 | config PM_AUTOSLEEP |
118 | bool "Opportunistic sleep" | |
119 | depends on PM_SLEEP | |
120 | default n | |
121 | ---help--- | |
122 | Allow the kernel to trigger a system transition into a global sleep | |
123 | state automatically whenever there are no active wakeup sources. | |
124 | ||
b86ff982 RW |
125 | config PM_WAKELOCKS |
126 | bool "User space wakeup sources interface" | |
127 | depends on PM_SLEEP | |
128 | default n | |
129 | ---help--- | |
130 | Allow user space to create, activate and deactivate wakeup source | |
131 | objects with the help of a sysfs-based interface. | |
132 | ||
c73893e2 RW |
133 | config PM_WAKELOCKS_LIMIT |
134 | int "Maximum number of user space wakeup sources (0 = no limit)" | |
135 | range 0 100000 | |
136 | default 100 | |
137 | depends on PM_WAKELOCKS | |
138 | ||
4e585d25 RW |
139 | config PM_WAKELOCKS_GC |
140 | bool "Garbage collector for user space wakeup sources" | |
141 | depends on PM_WAKELOCKS | |
142 | default y | |
143 | ||
464ed18e RW |
144 | config PM |
145 | bool "Device power management core functionality" | |
196ec243 RW |
146 | ---help--- |
147 | Enable functionality allowing I/O devices to be put into energy-saving | |
464ed18e RW |
148 | (low power) states, for example after a specified period of inactivity |
149 | (autosuspended), and woken up in response to a hardware-generated | |
196ec243 RW |
150 | wake-up event or a driver's request. |
151 | ||
152 | Hardware support is generally required for this functionality to work | |
153 | and the bus type drivers of the buses the devices are on are | |
464ed18e | 154 | responsible for the actual handling of device suspend requests and |
196ec243 RW |
155 | wake-up events. |
156 | ||
196ec243 RW |
157 | config PM_DEBUG |
158 | bool "Power Management Debug Support" | |
159 | depends on PM | |
160 | ---help--- | |
161 | This option enables various debugging support in the Power Management | |
162 | code. This is helpful when debugging and reporting PM bugs, like | |
163 | suspend support. | |
164 | ||
196ec243 RW |
165 | config PM_ADVANCED_DEBUG |
166 | bool "Extra PM attributes in sysfs for low-level debugging/testing" | |
167 | depends on PM_DEBUG | |
196ec243 RW |
168 | ---help--- |
169 | Add extra sysfs attributes allowing one to access some Power Management | |
170 | fields of device objects from user space. If you are not a kernel | |
171 | developer interested in debugging/testing Power Management, say "no". | |
172 | ||
196ec243 RW |
173 | config PM_TEST_SUSPEND |
174 | bool "Test suspend/resume and wakealarm during bootup" | |
175 | depends on SUSPEND && PM_DEBUG && RTC_CLASS=y | |
176 | ---help--- | |
177 | This option will let you suspend your machine during bootup, and | |
178 | make it wake up a few seconds later using an RTC wakeup alarm. | |
179 | Enable this with a kernel parameter like "test_suspend=mem". | |
180 | ||
181 | You probably want to have your system's RTC driver statically | |
182 | linked, ensuring that it's available when this test runs. | |
183 | ||
b2df1d4f | 184 | config PM_SLEEP_DEBUG |
196ec243 | 185 | def_bool y |
88a6f33e | 186 | depends on PM_DEBUG && PM_SLEEP |
196ec243 | 187 | |
70fea60d BG |
188 | config DPM_WATCHDOG |
189 | bool "Device suspend/resume watchdog" | |
5b3f249c | 190 | depends on PM_DEBUG && PSTORE && EXPERT |
70fea60d BG |
191 | ---help--- |
192 | Sets up a watchdog timer to capture drivers that are | |
193 | locked up attempting to suspend/resume a device. | |
194 | A detected lockup causes system panic with message | |
195 | captured in pstore device for inspection in subsequent | |
196 | boot session. | |
197 | ||
198 | config DPM_WATCHDOG_TIMEOUT | |
199 | int "Watchdog timeout in seconds" | |
200 | range 1 120 | |
5b3f249c | 201 | default 120 |
70fea60d BG |
202 | depends on DPM_WATCHDOG |
203 | ||
196ec243 RW |
204 | config PM_TRACE |
205 | bool | |
206 | help | |
207 | This enables code to save the last PM event point across | |
208 | reboot. The architecture needs to support this, x86 for | |
209 | example does by saving things in the RTC, see below. | |
210 | ||
211 | The architecture specific code must provide the extern | |
212 | functions from <linux/resume-trace.h> as well as the | |
213 | <asm/resume-trace.h> header with a TRACE_RESUME() macro. | |
214 | ||
215 | The way the information is presented is architecture- | |
216 | dependent, x86 will print the information during a | |
217 | late_initcall. | |
218 | ||
219 | config PM_TRACE_RTC | |
220 | bool "Suspend/resume event tracing" | |
b2df1d4f | 221 | depends on PM_SLEEP_DEBUG |
196ec243 RW |
222 | depends on X86 |
223 | select PM_TRACE | |
196ec243 RW |
224 | ---help--- |
225 | This enables some cheesy code to save the last PM event point in the | |
226 | RTC across reboots, so that you can debug a machine that just hangs | |
227 | during suspend (or more commonly, during resume). | |
228 | ||
229 | To use this debugging feature you should attempt to suspend the | |
230 | machine, reboot it and then run | |
231 | ||
232 | dmesg -s 1000000 | grep 'hash matches' | |
233 | ||
234 | CAUTION: this option will cause your machine's real-time clock to be | |
235 | set to an invalid time after a resume. | |
236 | ||
7726942f RB |
237 | config APM_EMULATION |
238 | tristate "Advanced Power Management Emulation" | |
993e9fe1 | 239 | depends on SYS_SUPPORTS_APM_EMULATION |
7726942f RB |
240 | help |
241 | APM is a BIOS specification for saving power using several different | |
242 | techniques. This is mostly useful for battery powered laptops with | |
243 | APM compliant BIOSes. If you say Y here, the system time will be | |
244 | reset after a RESUME operation, the /proc/apm device will provide | |
245 | battery status information, and user-space programs will receive | |
246 | notification of APM "events" (e.g. battery status change). | |
247 | ||
248 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
249 | and more information, read <file:Documentation/power/apm-acpi.txt> |
250 | and the Battery Powered Linux mini-HOWTO, available from | |
7726942f RB |
251 | <http://www.tldp.org/docs.html#howto>. |
252 | ||
253 | This driver does not spin down disk drives (see the hdparm(8) | |
254 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
255 | VESA-compliant "green" monitors. | |
256 | ||
257 | Generally, if you don't have a battery in your machine, there isn't | |
258 | much point in using this driver and you should say N. If you get | |
259 | random kernel OOPSes or reboots that don't seem to be related to | |
260 | anything, try disabling/enabling this option (or disabling/enabling | |
261 | APM in your BIOS). | |
5e928f77 | 262 | |
e1f60b29 | 263 | config PM_OPP |
049d595a | 264 | bool |
83fe27ea | 265 | select SRCU |
e1f60b29 NM |
266 | ---help--- |
267 | SOCs have a standard set of tuples consisting of frequency and | |
268 | voltage pairs that the device will support per voltage domain. This | |
269 | is called Operating Performance Point or OPP. The actual definitions | |
270 | of OPP varies over silicon within the same family of devices. | |
271 | ||
272 | OPP layer organizes the data internally using device pointers | |
273 | representing individual voltage domains and provides SOC | |
274 | implementations a ready to use framework to manage OPPs. | |
275 | For more information, read <file:Documentation/power/opp.txt> | |
85eb8c8d | 276 | |
b7b95920 | 277 | config PM_CLK |
85eb8c8d | 278 | def_bool y |
b7b95920 | 279 | depends on PM && HAVE_CLK |
f721889f RW |
280 | |
281 | config PM_GENERIC_DOMAINS | |
282 | bool | |
283 | depends on PM | |
17f2ae7f | 284 | |
cee22a15 VK |
285 | config WQ_POWER_EFFICIENT_DEFAULT |
286 | bool "Enable workqueue power-efficient mode by default" | |
287 | depends on PM | |
288 | default n | |
289 | help | |
290 | Per-cpu workqueues are generally preferred because they show | |
291 | better performance thanks to cache locality; unfortunately, | |
292 | per-cpu workqueues tend to be more power hungry than unbound | |
293 | workqueues. | |
294 | ||
295 | Enabling workqueue.power_efficient kernel parameter makes the | |
296 | per-cpu workqueues which were observed to contribute | |
297 | significantly to power consumption unbound, leading to measurably | |
298 | lower power usage at the cost of small performance overhead. | |
299 | ||
300 | This config option determines whether workqueue.power_efficient | |
301 | is enabled by default. | |
302 | ||
303 | If in doubt, say N. | |
304 | ||
77f827de RW |
305 | config PM_GENERIC_DOMAINS_SLEEP |
306 | def_bool y | |
307 | depends on PM_SLEEP && PM_GENERIC_DOMAINS | |
308 | ||
aa42240a TF |
309 | config PM_GENERIC_DOMAINS_OF |
310 | def_bool y | |
a4a8c2c4 | 311 | depends on PM_GENERIC_DOMAINS && OF |
aa42240a | 312 | |
ab10023e CC |
313 | config CPU_PM |
314 | bool |