kernel/power/Kconfig

   1 config SUSPEND
   2         bool "Suspend to RAM and standby"
   3         depends on ARCH_SUSPEND_POSSIBLE
   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
   8           suspend-to-RAM state (e.g. the ACPI S3 state).
   9
  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
  21 config HAS_WAKELOCK
  22         bool
  23         default y
  24
  25 config HAS_EARLYSUSPEND
  26         bool
  27         default y
  28
  29 config HAS_SBSUSPEND
  30         bool
  31         depends on HAS_EARLYSUSPEND
  32         default y
  33
  34 config WAKELOCK
  35         bool
  36         default y
  37
  38 config EARLYSUSPEND
  39         bool "Early suspend"
  40         depends on WAKELOCK
  41         default y
  42         select HAS_EARLYSUSPEND
  43         ---help---
  44           Call early suspend handlers when the user requested sleep state
  45           changes.
  46
  47 config FB_EARLYSUSPEND
  48         bool "FB Early suspend"
  49         depends on EARLYSUSPEND
  50         default y
  51         select HAS_EARLYSUSPEND
  52         ---help---
  53           Call early suspend handlers when the user requested sleep state
  54           changes.
  55
  56 config HIBERNATE_CALLBACKS
  57         bool
  58
  59 config HIBERNATION
  60         bool "Hibernation (aka 'suspend to disk')"
  61         depends on SWAP && ARCH_HIBERNATION_POSSIBLE
  62         select HIBERNATE_CALLBACKS
  63         select LZO_COMPRESS
  64         select LZO_DECOMPRESS
  65         select CRC32
  66         ---help---
  67           Enable the suspend to disk (STD) functionality, which is usually
  68           called "hibernation" in user interfaces.  STD checkpoints the
  69           system and powers it off; and restores that checkpoint on reboot.
  70
  71           You can suspend your machine with 'echo disk > /sys/power/state'
  72           after placing resume=/dev/swappartition on the kernel command line
  73           in your bootloader's configuration file.
  74
  75           Alternatively, you can use the additional userland tools available
  76           from <http://suspend.sf.net>.
  77
  78           In principle it does not require ACPI or APM, although for example
  79           ACPI will be used for the final steps when it is available.  One
  80           of the reasons to use software suspend is that the firmware hooks
  81           for suspend states like suspend-to-RAM (STR) often don't work very
  82           well with Linux.
  83
  84           It creates an image which is saved in your active swap. Upon the next
  85           boot, pass the 'resume=/dev/swappartition' argument to the kernel to
  86           have it detect the saved image, restore memory state from it, and
  87           continue to run as before. If you do not want the previous state to
  88           be reloaded, then use the 'noresume' kernel command line argument.
  89           Note, however, that fsck will be run on your filesystems and you will
  90           need to run mkswap against the swap partition used for the suspend.
  91
  92           It also works with swap files to a limited extent (for details see
  93           <file:Documentation/power/swsusp-and-swap-files.txt>).
  94
  95           Right now you may boot without resuming and resume later but in the
  96           meantime you cannot use the swap partition(s)/file(s) involved in
  97           suspending.  Also in this case you must not use the filesystems
  98           that were mounted before the suspend.  In particular, you MUST NOT
  99           MOUNT any journaled filesystems mounted before the suspend or they
 100           will get corrupted in a nasty way.
 101
 102           For more information take a look at <file:Documentation/power/swsusp.txt>.
 103
 104 config ARCH_SAVE_PAGE_KEYS
 105         bool
 106
 107 config PM_STD_PARTITION
 108         string "Default resume partition"
 109         depends on HIBERNATION
 110         default ""
 111         ---help---
 112           The default resume partition is the partition that the suspend-
 113           to-disk implementation will look for a suspended disk image.
 114
 115           The partition specified here will be different for almost every user.
 116           It should be a valid swap partition (at least for now) that is turned
 117           on before suspending.
 118
 119           The partition specified can be overridden by specifying:
 120
 121                 resume=/dev/<other device>
 122
 123           which will set the resume partition to the device specified.
 124
 125           Note there is currently not a way to specify which device to save the
 126           suspended image to. It will simply pick the first available swap
 127           device.
 128
 129 menuconfig TOI_CORE
 130         tristate "Enhanced Hibernation (TuxOnIce)"
 131         depends on HIBERNATION
 132         default y
 133         ---help---
 134           TuxOnIce is the 'new and improved' suspend support.
 135
 136           See the TuxOnIce home page (tuxonice.net)
 137           for FAQs, HOWTOs and other documentation.
 138
 139         comment "Image Storage (you need at least one allocator)"
 140                 depends on TOI_CORE
 141
 142         config TOI_FILE
 143                 tristate "File Allocator"
 144                 depends on TOI_CORE
 145                 default y
 146                 ---help---
 147                   This option enables support for storing an image in a
 148                   simple file. You might want this if your swap is
 149                   sometimes full enough that you don't have enough spare
 150                   space to store an image.
 151
 152         config TOI_SWAP
 153                 tristate "Swap Allocator"
 154                 depends on TOI_CORE && SWAP
 155                 default y
 156                 ---help---
 157                   This option enables support for storing an image in your
 158                   swap space.
 159
 160         comment "General Options"
 161                 depends on TOI_CORE
 162
 163         config TOI_INCREMENTAL
 164                 tristate "Incremental Image Support"
 165                 depends on TOI_CORE && CRYPTO && BROKEN
 166                 select CRYPTO_SHA1
 167                 default y
 168                 ---help---
 169                   This option adds initial support for using hashing algorithms
 170                   (a quick, internal implementation of Fletcher16 and SHA1 via
 171                   cryptoapi) to discover the number of pages which are
 172                   unchanged since the image was last written. It is hoped that
 173                   this will be an initial step toward implementing storing just
 174                   the differences between consecutive images, which will
 175                   increase the amount of storage needed for the image, but also
 176                   increase the speed at which writing an image occurs and
 177                   reduce the wear and tear on drives.
 178
 179         comment "No increemntal image support available without Cryptoapi support."
 180                 depends on TOI_CORE && !CRYPTO
 181
 182         config TOI_PRUNE
 183                 tristate "Image pruning support"
 184                 depends on TOI_CORE && CRYPTO && BROKEN
 185                 default y
 186                 ---help---
 187                   This option adds support for using cryptoapi hashing
 188                   algorithms to identify pages with the same content. We
 189                   then write a much smaller pointer to the first copy of
 190                   the data instead of a complete (perhaps compressed)
 191                   additional copy.
 192
 193                   You probably want this, so say Y here.
 194
 195         comment "No image pruning support available without Cryptoapi support."
 196                 depends on TOI_CORE && !CRYPTO
 197
 198         config TOI_CRYPTO
 199                 tristate "Compression support"
 200                 depends on TOI_CORE && CRYPTO
 201                 default y
 202                 ---help---
 203                   This option adds support for using cryptoapi compression
 204                   algorithms. Compression is particularly useful as it can
 205                   more than double your suspend and resume speed (depending
 206                   upon how well your image compresses).
 207
 208                   You probably want this, so say Y here.
 209
 210         comment "No compression support available without Cryptoapi support."
 211                 depends on TOI_CORE && !CRYPTO
 212
 213         config TOI_USERUI
 214                 tristate "Userspace User Interface support"
 215                 depends on TOI_CORE && NET && (VT || SERIAL_CONSOLE)
 216                 default y
 217                 ---help---
 218                   This option enabled support for a userspace based user interface
 219                   to TuxOnIce, which allows you to have a nice display while suspending
 220                   and resuming, and also enables features such as pressing escape to
 221                   cancel a cycle or interactive debugging.
 222
 223         config TOI_USERUI_DEFAULT_PATH
 224                 string "Default userui program location"
 225                 default "/usr/local/sbin/tuxoniceui_text"
 226                 depends on TOI_USERUI
 227                 ---help---
 228                   This entry allows you to specify a default path to the userui binary.
 229
 230         config TOI_DEFAULT_IMAGE_SIZE_LIMIT
 231                 int "Default image size limit"
 232                 range -2 65536
 233                 default "-2"
 234                 depends on TOI_CORE
 235                 ---help---
 236                   This entry allows you to specify a default image size limit. It can
 237                   be overridden at run-time using /sys/power/tuxonice/image_size_limit.
 238
 239         config TOI_KEEP_IMAGE
 240                 bool "Allow Keep Image Mode"
 241                 depends on TOI_CORE
 242                 ---help---
 243                   This option allows you to keep and image and reuse it. It is intended
 244                   __ONLY__ for use with systems where all filesystems are mounted read-
 245                   only (kiosks, for example). To use it, compile this option in and boot
 246                   normally. Set the KEEP_IMAGE flag in /sys/power/tuxonice and suspend.
 247                   When you resume, the image will not be removed. You will be unable to turn
 248                   off swap partitions (assuming you are using the swap allocator), but future
 249                   suspends simply do a power-down. The image can be updated using the
 250                   kernel command line parameter suspend_act= to turn off the keep image
 251                   bit. Keep image mode is a little less user friendly on purpose - it
 252                   should not be used without thought!
 253
 254         config TOI_REPLACE_SWSUSP
 255                 bool "Replace swsusp by default"
 256                 default y
 257                 depends on TOI_CORE
 258                 ---help---
 259                   TuxOnIce can replace swsusp. This option makes that the default state,
 260                   requiring you to echo 0 > /sys/power/tuxonice/replace_swsusp if you want
 261                   to use the vanilla kernel functionality. Note that your initrd/ramfs will
 262                   need to do this before trying to resume, too.
 263                   With overriding swsusp enabled, echoing disk  to /sys/power/state will
 264                   start a TuxOnIce cycle. If resume= doesn't specify an allocator and both
 265                   the swap and file allocators are compiled in, the swap allocator will be
 266                   used by default.
 267
 268         config TOI_IGNORE_LATE_INITCALL
 269                 bool "Wait for initrd/ramfs to run, by default"
 270                 default n
 271                 depends on TOI_CORE
 272                 ---help---
 273                   When booting, TuxOnIce can check for an image and start to resume prior
 274                   to any initrd/ramfs running (via a late initcall).
 275
 276                   If you don't have an initrd/ramfs, this is what you want to happen -
 277                   otherwise you won't be able to safely resume. You should set this option
 278                   to 'No'.
 279
 280                   If, however, you want your initrd/ramfs to run anyway before resuming,
 281                   you need to tell TuxOnIce to ignore that earlier opportunity to resume.
 282                   This can be done either by using this compile time option, or by
 283                   overriding this option with the boot-time parameter toi_initramfs_resume_only=1.
 284
 285                   Note that if TuxOnIce can't resume at the earlier opportunity, the
 286                   value of this option won't matter - the initramfs/initrd (if any) will
 287                   run anyway.
 288
 289         menuconfig TOI_CLUSTER
 290                 tristate "Cluster support"
 291                 default n
 292                 depends on TOI_CORE && NET && BROKEN
 293                 ---help---
 294                   Support for linking multiple machines in a cluster so that they suspend
 295                   and resume together.
 296
 297         config TOI_DEFAULT_CLUSTER_INTERFACE
 298                 string "Default cluster interface"
 299                 depends on TOI_CLUSTER
 300                 ---help---
 301                   The default interface on which to communicate with other nodes in
 302                   the cluster.
 303
 304                   If no value is set here, cluster support will be disabled by default.
 305
 306         config TOI_DEFAULT_CLUSTER_KEY
 307                 string "Default cluster key"
 308                 default "Default"
 309                 depends on TOI_CLUSTER
 310                 ---help---
 311                   The default key used by this node. All nodes in the same cluster
 312                   have the same key. Multiple clusters may coexist on the same lan
 313                   by using different values for this key.
 314
 315         config TOI_CLUSTER_IMAGE_TIMEOUT
 316                 int "Timeout when checking for image"
 317                 default 15
 318                 depends on TOI_CLUSTER
 319                 ---help---
 320                   Timeout (seconds) before continuing to boot when waiting to see
 321                   whether other nodes might have an image. Set to -1 to wait
 322                   indefinitely. In WAIT_UNTIL_NODES is non zero, we might continue
 323                   booting sooner than this timeout.
 324
 325         config TOI_CLUSTER_WAIT_UNTIL_NODES
 326                 int "Nodes without image before continuing"
 327                 default 0
 328                 depends on TOI_CLUSTER
 329                 ---help---
 330                   When booting and no image is found, we wait to see if other nodes
 331                   have an image before continuing to boot. This value lets us
 332                   continue after seeing a certain number of nodes without an image,
 333                   instead of continuing to wait for the timeout. Set to 0 to only
 334                   use the timeout.
 335
 336         config TOI_DEFAULT_CLUSTER_PRE_HIBERNATE
 337                 string "Default pre-hibernate script"
 338                 depends on TOI_CLUSTER
 339                 ---help---
 340                   The default script to be called when starting to hibernate.
 341
 342         config TOI_DEFAULT_CLUSTER_POST_HIBERNATE
 343                 string "Default post-hibernate script"
 344                 depends on TOI_CLUSTER
 345                 ---help---
 346                   The default script to be called after resuming from hibernation.
 347
 348         config TOI_DEFAULT_WAIT
 349                 int "Default waiting time for emergency boot messages"
 350                 default "25"
 351                 range -1 32768
 352                 depends on TOI_CORE
 353                 help
 354                   TuxOnIce can display warnings very early in the process of resuming,
 355                   if (for example) it appears that you have booted a kernel that doesn't
 356                   match an image on disk. It can then give you the opportunity to either
 357                   continue booting that kernel, or reboot the machine. This option can be
 358                   used to control how long to wait in such circumstances. -1 means wait
 359                   forever. 0 means don't wait at all (do the default action, which will
 360                   generally be to continue booting and remove the image). Values of 1 or
 361                   more indicate a number of seconds (up to 255) to wait before doing the
 362                   default.
 363
 364         config  TOI_DEFAULT_EXTRA_PAGES_ALLOWANCE
 365                 int "Default extra pages allowance"
 366                 default "2000"
 367                 range 500 32768
 368                 depends on TOI_CORE
 369                 help
 370                   This value controls the default for the allowance TuxOnIce makes for
 371                   drivers to allocate extra memory during the atomic copy. The default
 372                   value of 2000 will be okay in most cases. If you are using
 373                   DRI, the easiest way to find what value to use is to try to hibernate
 374                   and look at how many pages were actually needed in the sysfs entry
 375                   /sys/power/tuxonice/debug_info (first number on the last line), adding
 376                   a little extra because the value is not always the same.
 377
 378         config TOI_CHECKSUM
 379                 bool "Checksum pageset2"
 380                 default n
 381                 depends on TOI_CORE
 382                 select CRYPTO
 383                 select CRYPTO_ALGAPI
 384                 select CRYPTO_MD4
 385                 ---help---
 386                   Adds support for checksumming pageset2 pages, to ensure you really get an
 387                   atomic copy. Since some filesystems (XFS especially) change metadata even
 388                   when there's no other activity, we need this to check for pages that have
 389                   been changed while we were saving the page cache. If your debugging output
 390                   always says no pages were resaved, you may be able to safely disable this
 391                   option.
 392
 393 config TOI
 394         bool
 395         depends on TOI_CORE!=n
 396         default y
 397
 398 config TOI_EXPORTS
 399         bool
 400         depends on TOI_SWAP=m || TOI_FILE=m || \
 401                 TOI_CRYPTO=m || TOI_CLUSTER=m || \
 402                 TOI_USERUI=m || TOI_CORE=m
 403         default y
 404
 405 config TOI_ZRAM_SUPPORT
 406         def_bool y
 407         depends on TOI && ZRAM!=n
 408
 409 config TOI_FIXUP
 410         def_bool y
 411         depends on TOI
 412
 413 config TOI_ENHANCE
 414         def_bool y
 415         depends on TOI
 416
 417 config PM_SLEEP
 418         def_bool y
 419         depends on SUSPEND || HIBERNATE_CALLBACKS
 420
 421 config PM_SLEEP_SMP
 422         def_bool y
 423         depends on SMP
 424         depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
 425         depends on PM_SLEEP
 426         select HOTPLUG
 427         select HOTPLUG_CPU
 428
 429 config PM_AUTOSLEEP
 430         bool "Opportunistic sleep"
 431         depends on PM_SLEEP
 432         default n
 433         ---help---
 434         Allow the kernel to trigger a system transition into a global sleep
 435         state automatically whenever there are no active wakeup sources.
 436
 437 config PM_WAKELOCKS
 438         bool "User space wakeup sources interface"
 439         depends on PM_SLEEP
 440         default n
 441         ---help---
 442         Allow user space to create, activate and deactivate wakeup source
 443         objects with the help of a sysfs-based interface.
 444
 445 config PM_WAKELOCKS_LIMIT
 446         int "Maximum number of user space wakeup sources (0 = no limit)"
 447         range 0 100000
 448         default 100
 449         depends on PM_WAKELOCKS
 450
 451 config PM_WAKELOCKS_GC
 452         bool "Garbage collector for user space wakeup sources"
 453         depends on PM_WAKELOCKS
 454         default y
 455
 456 config PM_RUNTIME
 457         bool "Run-time PM core functionality"
 458         depends on !IA64_HP_SIM
 459         ---help---
 460           Enable functionality allowing I/O devices to be put into energy-saving
 461           (low power) states at run time (or autosuspended) after a specified
 462           period of inactivity and woken up in response to a hardware-generated
 463           wake-up event or a driver's request.
 464
 465           Hardware support is generally required for this functionality to work
 466           and the bus type drivers of the buses the devices are on are
 467           responsible for the actual handling of the autosuspend requests and
 468           wake-up events.
 469
 470 config PM
 471         def_bool y
 472         depends on PM_SLEEP || PM_RUNTIME
 473
 474 config PM_DEBUG
 475         bool "Power Management Debug Support"
 476         depends on PM
 477         ---help---
 478         This option enables various debugging support in the Power Management
 479         code. This is helpful when debugging and reporting PM bugs, like
 480         suspend support.
 481
 482 config PM_ADVANCED_DEBUG
 483         bool "Extra PM attributes in sysfs for low-level debugging/testing"
 484         depends on PM_DEBUG
 485         ---help---
 486         Add extra sysfs attributes allowing one to access some Power Management
 487         fields of device objects from user space.  If you are not a kernel
 488         developer interested in debugging/testing Power Management, say "no".
 489
 490 config PM_TEST_SUSPEND
 491         bool "Test suspend/resume and wakealarm during bootup"
 492         depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
 493         ---help---
 494         This option will let you suspend your machine during bootup, and
 495         make it wake up a few seconds later using an RTC wakeup alarm.
 496         Enable this with a kernel parameter like "test_suspend=mem".
 497
 498         You probably want to have your system's RTC driver statically
 499         linked, ensuring that it's available when this test runs.
 500
 501 config PM_SLEEP_DEBUG
 502         def_bool y
 503         depends on PM_DEBUG && PM_SLEEP
 504
 505 config PM_TRACE
 506         bool
 507         help
 508           This enables code to save the last PM event point across
 509           reboot. The architecture needs to support this, x86 for
 510           example does by saving things in the RTC, see below.
 511
 512           The architecture specific code must provide the extern
 513           functions from <linux/resume-trace.h> as well as the
 514           <asm/resume-trace.h> header with a TRACE_RESUME() macro.
 515
 516           The way the information is presented is architecture-
 517           dependent, x86 will print the information during a
 518           late_initcall.
 519
 520 config PM_TRACE_RTC
 521         bool "Suspend/resume event tracing"
 522         depends on PM_SLEEP_DEBUG
 523         depends on X86
 524         select PM_TRACE
 525         ---help---
 526         This enables some cheesy code to save the last PM event point in the
 527         RTC across reboots, so that you can debug a machine that just hangs
 528         during suspend (or more commonly, during resume).
 529
 530         To use this debugging feature you should attempt to suspend the
 531         machine, reboot it and then run
 532
 533                 dmesg -s 1000000 | grep 'hash matches'
 534
 535         CAUTION: this option will cause your machine's real-time clock to be
 536         set to an invalid time after a resume.
 537
 538 config APM_EMULATION
 539         tristate "Advanced Power Management Emulation"
 540         depends on PM && SYS_SUPPORTS_APM_EMULATION
 541         help
 542           APM is a BIOS specification for saving power using several different
 543           techniques. This is mostly useful for battery powered laptops with
 544           APM compliant BIOSes. If you say Y here, the system time will be
 545           reset after a RESUME operation, the /proc/apm device will provide
 546           battery status information, and user-space programs will receive
 547           notification of APM "events" (e.g. battery status change).
 548
 549           In order to use APM, you will need supporting software. For location
 550           and more information, read <file:Documentation/power/apm-acpi.txt>
 551           and the Battery Powered Linux mini-HOWTO, available from
 552           <http://www.tldp.org/docs.html#howto>.
 553
 554           This driver does not spin down disk drives (see the hdparm(8)
 555           manpage ("man 8 hdparm") for that), and it doesn't turn off
 556           VESA-compliant "green" monitors.
 557
 558           Generally, if you don't have a battery in your machine, there isn't
 559           much point in using this driver and you should say N. If you get
 560           random kernel OOPSes or reboots that don't seem to be related to
 561           anything, try disabling/enabling this option (or disabling/enabling
 562           APM in your BIOS).
 563
 564 config ARCH_HAS_OPP
 565         bool
 566
 567 config PM_OPP
 568         bool "Operating Performance Point (OPP) Layer library"
 569         depends on ARCH_HAS_OPP
 570         ---help---
 571           SOCs have a standard set of tuples consisting of frequency and
 572           voltage pairs that the device will support per voltage domain. This
 573           is called Operating Performance Point or OPP. The actual definitions
 574           of OPP varies over silicon within the same family of devices.
 575
 576           OPP layer organizes the data internally using device pointers
 577           representing individual voltage domains and provides SOC
 578           implementations a ready to use framework to manage OPPs.
 579           For more information, read <file:Documentation/power/opp.txt>
 580
 581 config PM_CLK
 582         def_bool y
 583         depends on PM && HAVE_CLK
 584
 585 config PM_GENERIC_DOMAINS
 586         bool
 587         depends on PM
 588
 589 config PM_GENERIC_DOMAINS_SLEEP
 590         def_bool y
 591         depends on PM_SLEEP && PM_GENERIC_DOMAINS
 592
 593 config PM_GENERIC_DOMAINS_RUNTIME
 594         def_bool y
 595         depends on PM_RUNTIME && PM_GENERIC_DOMAINS
 596
 597 config CPU_PM
 598         bool
 599         depends on SUSPEND || CPU_IDLE
 600
 601 config SUSPEND_TIME
 602         bool "Log time spent in suspend"
 603         ---help---
 604           Prints the time spent in suspend in the kernel log, and
 605           keeps statistics on the time spent in suspend in
 606           /sys/kernel/debug/suspend_time