iokit/Kernel/IOServicePMPrivate.h

   1 /*
   2  * Copyright (c) 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _IOKIT_IOSERVICEPMPRIVATE_H
  30 #define _IOKIT_IOSERVICEPMPRIVATE_H
  31
  32 /* Binary compatibility with drivers that access pm_vars */
  33 #define PM_VARS_SUPPORT     1
  34
  35 /*! @class IOServicePM
  36     @abstract Power management class.
  37 */
  38 class IOServicePM : public OSObject
  39 {
  40     friend class IOService;
  41
  42     OSDeclareDefaultStructors( IOServicePM )
  43
  44 private:
  45     /*! @var Owner
  46         Points to object that called PMinit().  Used only for debugging.
  47     */
  48     IOService *             Owner;
  49
  50     /*! @var InterestedDrivers
  51         List of interested drivers.
  52     */
  53     IOPMinformeeList *      InterestedDrivers;
  54
  55     /*! @var DriverTimer
  56         How long to wait for controlling driver to acknowledge.
  57     */
  58     IOReturn                DriverTimer;
  59
  60     /*! @var AckTimer */
  61     thread_call_t           AckTimer;
  62
  63     /*! @var SettleTimer */
  64     thread_call_t           SettleTimer;
  65
  66     /*! @var MachineState
  67         Current power management machine state.
  68     */
  69     unsigned long           MachineState;
  70
  71     /*! @var SettleTimeUS
  72         Settle time after changing power state.
  73     */
  74     unsigned long           SettleTimeUS;
  75
  76     /*! @var HeadNoteFlags
  77         The flags field for the current change note.
  78     */
  79     unsigned long           HeadNoteFlags;
  80
  81     /*! @var HeadNoteState
  82         The newStateNumber field for the current change note.
  83     */
  84     unsigned long           HeadNoteState;
  85
  86     /*! @var HeadNoteOutputFlags
  87         The outputPowerCharacter field for the current change note.
  88     */
  89     unsigned long           HeadNoteOutputFlags;
  90
  91     /*! @var HeadNoteDomainState
  92         Power domain flags from parent. (only on parent change).
  93     */
  94     unsigned long           HeadNoteDomainState;
  95
  96     /*! @var HeadNoteParent
  97         Pointer to initiating parent. (only on parent change).
  98     */
  99     IOPowerConnection *     HeadNoteParent;
 100
 101     /*! @var HeadNoteCapabilityFlags
 102         The capabilityFlags field for the current change note.
 103     */
 104     unsigned long           HeadNoteCapabilityFlags;
 105
 106     /*! @var HeadNotePendingAcks
 107         Number of acks we are waiting for.
 108     */
 109     unsigned long           HeadNotePendingAcks;
 110
 111     /*! @var PMLock
 112         PM state lock.
 113     */
 114     IOLock      *               PMLock;
 115
 116     /*! @var WeAreRoot
 117         True if our owner is the root of the power tree.
 118     */
 119     bool                    WeAreRoot;
 120
 121     /*! @var InitialChange
 122         Initialized to true, then set to false after the initial power change.
 123     */
 124     bool                    InitialChange;
 125
 126     /*! @var NeedToBecomeUsable
 127         Someone has called makeUsable before we had a controlling driver.
 128     */
 129     bool                    NeedToBecomeUsable;
 130
 131     /*! @var DeviceOverrides
 132         Ignore children and driver desires if true.
 133     */
 134     bool                    DeviceOverrides;
 135
 136     /*! @var ClampOn
 137         Domain is clamped on until the first power child is added.
 138     */
 139     bool                    ClampOn;
 140
 141     /*! @var DeviceActive
 142         True if device was active since last idle timer expiration.
 143     */
 144     bool                    DeviceActive;
 145
 146     /*! @var DoNotPowerDown
 147         Keeps track of any negative responses from notified apps and clients.
 148     */
 149     bool                                        DoNotPowerDown;
 150
 151     /*! @var ParentsKnowState
 152         True if all our parents know the state of their power domain.
 153     */
 154     bool                                        ParentsKnowState;
 155
 156     /*! @var DeviceActiveTimestamp
 157         Time of last device activity.
 158     */
 159     AbsoluteTime            DeviceActiveTimestamp;
 160
 161     /*! @var ActivityLock
 162         Used to protect activity flag.
 163     */
 164     IOLock *                ActivityLock;
 165
 166     /*! @var IdleTimerEventSource
 167         An idle timer event source.
 168     */
 169     IOTimerEventSource *    IdleTimerEventSource;
 170
 171     /*! @var IdleTimerPeriod
 172         Idle timer's period in seconds.
 173     */
 174     unsigned long           IdleTimerPeriod;
 175
 176     /*! @var DriverDesire
 177         Power state desired by our controlling driver.
 178     */
 179     unsigned long           DriverDesire;
 180
 181     /*! @var DeviceDesire
 182         Power state desired by a subclassed device object.
 183     */
 184     unsigned long           DeviceDesire;
 185
 186     /*! @var ChildrenDesire
 187         Power state desired by all children.
 188     */
 189     unsigned long           ChildrenDesire;
 190
 191     /*! @var DesiredPowerState
 192         This is the power state we desire currently.
 193     */
 194     unsigned long           DesiredPowerState;
 195
 196     /*! @var PreviousRequest
 197         This is what our parent thinks our need is.
 198     */
 199     unsigned long           PreviousRequest;
 200
 201         /*! @var Name
 202                 Cache result from getName(), used in logging.
 203         */
 204     const char *            Name;
 205
 206     /*! @var Platform
 207         Cache result from getPlatform(), used in logging and registering.
 208     */
 209     IOPlatformExpert *      Platform;
 210
 211     /*! @var NumberOfPowerStates
 212         Number of power states in the power array.
 213     */
 214     unsigned long           NumberOfPowerStates;
 215
 216     /*! @var PowerStates
 217         Power state array.
 218     */
 219     IOPMPowerState *            PowerStates;
 220
 221     /*! @var ControllingDriver
 222         The controlling driver.
 223     */
 224     IOService *                         ControllingDriver;
 225
 226     /*! @var AggressivenessValues
 227         Array of aggressiveness values.
 228     */
 229     unsigned long                       AggressivenessValue[ kMaxType + 1 ];
 230
 231     /*! @var AggressivenessValid
 232         True for aggressiveness values that are currently valid.
 233     */
 234     bool                                        AggressivenessValid[ kMaxType + 1 ];
 235
 236     /*! @var CurrentPowerState
 237         The ordinal of our current power state.
 238     */
 239     unsigned long                       CurrentPowerState;
 240
 241     /*! @var ParentsCurrentPowerFlags
 242         Logical OR of power flags for each power domain parent.
 243     */
 244     IOPMPowerFlags                      ParentsCurrentPowerFlags;
 245
 246     /*! @var MaxCapability
 247         Ordinal of highest power state we can achieve in current power domain.
 248     */
 249     unsigned long                       MaxCapability;
 250
 251     /*! @var OutputPowerCharacterFlags
 252         Logical OR of all output power character flags in the array.
 253     */
 254     IOPMPowerFlags                      OutputPowerCharacterFlags;
 255
 256     /*! @var SerialNumber
 257         Used to uniquely identify power management notification to apps and clients.
 258     */
 259     UInt16                                      SerialNumber;
 260
 261     /*! @var ResponseArray
 262         OSArray which manages responses from notified apps and clients.
 263     */
 264     OSArray *                           ResponseArray;
 265
 266     /*! @var OutOfBandParameter
 267         Used to communicate desired function to tellClientsWithResponse().
 268         This is used because it avoids changing the signatures of the affected virtual methods.
 269     */
 270     int                                         OutOfBandParameter;
 271
 272     AbsoluteTime            DriverCallStartTime;
 273     IOPMPowerFlags          CurrentCapabilityFlags;
 274     unsigned long           CurrentPowerConsumption;
 275     unsigned long           TempClampPowerState;
 276     unsigned long           TempClampCount;
 277     IOPMWorkQueue *                     PMWorkQueue;
 278     IOPMRequest *                       PMRequest;
 279     OSSet *                                     InsertInterestSet;
 280     OSSet *                                     RemoveInterestSet;
 281     OSArray *                           NotifyChildArray;
 282     unsigned long                       WaitReason;
 283     unsigned long                       NextMachineState;
 284     thread_call_t                       DriverCallEntry;
 285     void *                                      DriverCallParamPtr;
 286     IOItemCount                         DriverCallParamCount;
 287     IOItemCount                         DriverCallParamSlots;
 288     IOOptionBits                        DriverCallReason;
 289     long                    ActivityTicklePowerState;
 290     bool                                        StrictTreeOrder;
 291     bool                                        DriverCallBusy;
 292     bool                                        ActivityTimerStopped;
 293     bool                                        WillAdjustPowerState;
 294     bool                                        WillPMStop;
 295
 296 #if PM_VARS_SUPPORT
 297     IOPMprot *                          PMVars;
 298 #endif
 299
 300     /*! @function serialize
 301         Serialize IOServicePM state for debug output.
 302     */
 303     virtual bool serialize( OSSerialize * s ) const;
 304 };
 305
 306 #define fWeAreRoot                  pwrMgt->WeAreRoot
 307 #define fInterestedDrivers          pwrMgt->InterestedDrivers
 308 #define fDriverTimer                pwrMgt->DriverTimer
 309 #define fAckTimer                   pwrMgt->AckTimer
 310 #define fSettleTimer                pwrMgt->SettleTimer
 311 #define fMachineState               pwrMgt->MachineState
 312 #define fSettleTimeUS               pwrMgt->SettleTimeUS
 313 #define fHeadNoteFlags              pwrMgt->HeadNoteFlags
 314 #define fHeadNoteState              pwrMgt->HeadNoteState
 315 #define fHeadNoteOutputFlags        pwrMgt->HeadNoteOutputFlags
 316 #define fHeadNoteDomainState        pwrMgt->HeadNoteDomainState
 317 #define fHeadNoteParent             pwrMgt->HeadNoteParent
 318 #define fHeadNoteCapabilityFlags    pwrMgt->HeadNoteCapabilityFlags
 319 #define fHeadNotePendingAcks        pwrMgt->HeadNotePendingAcks
 320 #define fPMLock                     pwrMgt->PMLock
 321 #define fInitialChange              pwrMgt->InitialChange
 322 #define fNeedToBecomeUsable         pwrMgt->NeedToBecomeUsable
 323 #define fDeviceOverrides            pwrMgt->DeviceOverrides
 324 #define fClampOn                    pwrMgt->ClampOn
 325 #define fOwner                      pwrMgt->Owner
 326 #define fActivityLock               pwrMgt->ActivityLock
 327 #define fIdleTimerEventSource       pwrMgt->IdleTimerEventSource
 328 #define fIdleTimerPeriod            pwrMgt->IdleTimerPeriod
 329 #define fDeviceActive               pwrMgt->DeviceActive
 330 #define fDeviceActiveTimestamp      pwrMgt->DeviceActiveTimestamp
 331 #define fDriverDesire               pwrMgt->DriverDesire
 332 #define fDeviceDesire               pwrMgt->DeviceDesire
 333 #define fChildrenDesire             pwrMgt->ChildrenDesire
 334 #define fDesiredPowerState          pwrMgt->DesiredPowerState
 335 #define fPreviousRequest            pwrMgt->PreviousRequest
 336 #define fName                       pwrMgt->Name
 337 #define fPlatform                   pwrMgt->Platform
 338 #define fNumberOfPowerStates        pwrMgt->NumberOfPowerStates
 339 #define fPowerStates                pwrMgt->PowerStates
 340 #define fControllingDriver          pwrMgt->ControllingDriver
 341 #define fAggressivenessValue        pwrMgt->AggressivenessValue
 342 #define fAggressivenessValid        pwrMgt->AggressivenessValid
 343 #define fCurrentPowerState          pwrMgt->CurrentPowerState
 344 #define fParentsKnowState           pwrMgt->ParentsKnowState
 345 #define fParentsCurrentPowerFlags   pwrMgt->ParentsCurrentPowerFlags
 346 #define fMaxCapability              pwrMgt->MaxCapability
 347 #define fOutputPowerCharacterFlags  pwrMgt->OutputPowerCharacterFlags
 348 #define fSerialNumber               pwrMgt->SerialNumber
 349 #define fResponseArray              pwrMgt->ResponseArray
 350 #define fDoNotPowerDown             pwrMgt->DoNotPowerDown
 351 #define fOutOfBandParameter         pwrMgt->OutOfBandParameter
 352 #define fDriverCallStartTime        pwrMgt->DriverCallStartTime
 353 #define fCurrentCapabilityFlags     pwrMgt->CurrentCapabilityFlags
 354 #define fCurrentPowerConsumption    pwrMgt->CurrentPowerConsumption
 355 #define fTempClampPowerState        pwrMgt->TempClampPowerState
 356 #define fTempClampCount             pwrMgt->TempClampCount
 357 #define fPMWorkQueue                pwrMgt->PMWorkQueue
 358 #define fPMRequest                  pwrMgt->PMRequest
 359 #define fWaitReason                 pwrMgt->WaitReason
 360 #define fNextMachineState           pwrMgt->NextMachineState
 361 #define fDriverCallReason           pwrMgt->DriverCallReason
 362 #define fDriverCallEntry            pwrMgt->DriverCallEntry
 363 #define fDriverCallParamPtr         pwrMgt->DriverCallParamPtr
 364 #define fDriverCallParamCount       pwrMgt->DriverCallParamCount
 365 #define fDriverCallParamSlots       pwrMgt->DriverCallParamSlots
 366 #define fDriverCallBusy             pwrMgt->DriverCallBusy
 367 #define fWillPMStop                 pwrMgt->WillPMStop
 368 #define fActivityTickled            pwrMgt->ActivityTickled
 369 #define fInsertInterestSet          pwrMgt->InsertInterestSet
 370 #define fRemoveInterestSet          pwrMgt->RemoveInterestSet
 371 #define fStrictTreeOrder            pwrMgt->StrictTreeOrder
 372 #define fNotifyChildArray           pwrMgt->NotifyChildArray
 373 #define fWillAdjustPowerState       pwrMgt->WillAdjustPowerState
 374 #define fActivityTimerStopped       pwrMgt->ActivityTimerStopped
 375 #define fActivityTicklePowerState   pwrMgt->ActivityTicklePowerState
 376 #define fPMVars                     pwrMgt->PMVars
 377
 378 /*!
 379 @defined ACK_TIMER_PERIOD
 380 @discussion When an IOService is waiting for acknowledgement to a power change
 381 notification from an interested driver or the controlling driver its ack timer
 382 is ticking every tenth of a second.
 383 (100000000 nanoseconds are one tenth of a second).
 384 */
 385 #define ACK_TIMER_PERIOD 100000000
 386
 387 #define IOPMParentInitiated     1   // this power change initiated by our  parent
 388 #define IOPMWeInitiated         2   // this power change initiated by this device
 389 #define IOPMNotDone             4   // we couldn't make this change
 390 #define IOPMNotInUse            8   // this list element not currently in use
 391 #define IOPMDomainWillChange    16  // change started by PowerDomainWillChangeTo
 392 #define IOPMDomainDidChange     32  // change started by PowerDomainDidChangeTo
 393
 394 struct changeNoteItem {
 395     unsigned long       flags;
 396     unsigned long       newStateNumber;
 397     IOPMPowerFlags      outputPowerCharacter;
 398     IOPMPowerFlags      inputPowerRequirement;
 399     IOPMPowerFlags      domainState;
 400     IOPowerConnection * parent;
 401     IOPMPowerFlags      singleParentState;
 402     IOPMPowerFlags      capabilityFlags;
 403 };
 404
 405 enum {
 406     kDriverCallInformPreChange,
 407     kDriverCallInformPostChange,
 408     kDriverCallSetPowerState
 409 };
 410
 411 struct DriverCallParam {
 412     OSObject *  Target;
 413     IOReturn    Result;
 414 };
 415
 416 // values of outofbandparameter
 417 enum {
 418     kNotifyApps,
 419     kNotifyPriority
 420 };
 421
 422 // used for applyToInterested
 423 struct context {
 424     OSArray *      responseFlags;
 425     UInt16         serialNumber;
 426     UInt16         counter;
 427     UInt32         maxTimeRequested;
 428     int            msgType;
 429     IOService *    us;
 430     unsigned long  stateNumber;
 431     IOPMPowerFlags stateFlags;
 432     const char * errorLog;
 433 };
 434
 435 //*********************************************************************************
 436 // PM command types
 437 //*********************************************************************************
 438
 439 enum {
 440     /* Command Types */
 441     kIOPMRequestTypeInvalid                = 0x00,
 442     kIOPMRequestTypePMStop                 = 0x01,
 443     kIOPMRequestTypeAddPowerChild1         = 0x02,
 444     kIOPMRequestTypeAddPowerChild2         = 0x03,
 445     kIOPMRequestTypeAddPowerChild3         = 0x04,
 446     kIOPMRequestTypeRegisterPowerDriver    = 0x05,
 447     kIOPMRequestTypeAdjustPowerState       = 0x06,
 448     kIOPMRequestTypeMakeUsable             = 0x07,
 449     kIOPMRequestTypeTemporaryPowerClamp    = 0x08,
 450     kIOPMRequestTypePowerDomainWillChange  = 0x09,
 451     kIOPMRequestTypePowerDomainDidChange   = 0x0A,
 452     kIOPMRequestTypeChangePowerStateTo     = 0x0B,
 453     kIOPMRequestTypeChangePowerStateToPriv = 0x0C,
 454     kIOPMRequestTypePowerOverrideOnPriv    = 0x0D,
 455     kIOPMRequestTypePowerOverrideOffPriv   = 0x0E,
 456     kIOPMRequestTypeActivityTickle         = 0x0F,
 457     /* Reply Types */
 458     kIOPMRequestTypeReplyStart             = 0x80,
 459     kIOPMRequestTypeAckPowerChange         = 0x81,
 460     kIOPMRequestTypeAckSetPowerState       = 0x82,
 461     kIOPMRequestTypeAllowPowerChange       = 0x83,
 462     kIOPMRequestTypeCancelPowerChange      = 0x84,
 463     kIOPMRequestTypeInterestChanged        = 0x85
 464 };
 465
 466 //*********************************************************************************
 467 // PM Helper Classes
 468 //*********************************************************************************
 469
 470 class IOPMRequest : public IOCommand
 471 {
 472     OSDeclareDefaultStructors( IOPMRequest )
 473
 474 protected:
 475     IOOptionBits        fType;          // request type
 476     IOService *         fTarget;        // request target
 477     IOPMRequest *       fParent;        // parent request
 478     IOItemCount         fChildCount;    // wait if non-zero
 479
 480 public:
 481     void *              fArg0;
 482     void *              fArg1;
 483     void *              fArg2;
 484
 485     inline bool         hasChildRequest( void ) const
 486     {
 487         return (fChildCount != 0);
 488     }
 489
 490     inline bool         hasParentRequest( void ) const
 491     {
 492         return (fParent != 0);
 493     }
 494
 495     inline void         setParentRequest( IOPMRequest * parent )
 496     {
 497         if (!fParent)
 498         {
 499             fParent = parent;
 500             fParent->fChildCount++;
 501         }
 502     }
 503
 504     inline IOOptionBits getType( void ) const
 505     {
 506         return fType;
 507     }
 508
 509     inline bool         isReply( void ) const
 510     {
 511         return (fType > kIOPMRequestTypeReplyStart);
 512     }
 513
 514     inline IOService *  getTarget( void ) const
 515     {
 516         return fTarget;
 517     }
 518
 519     static IOPMRequest *create( void );
 520
 521     void    reset( void );
 522
 523     bool    init( IOService * owner, IOOptionBits type );
 524 };
 525
 526 class IOPMRequestQueue : public IOEventSource
 527 {
 528     OSDeclareDefaultStructors( IOPMRequestQueue )
 529
 530 public:
 531     typedef bool (*Action)( IOService *, IOPMRequest *, IOPMRequestQueue * );
 532
 533 protected:
 534     queue_head_t    fQueue;
 535     IOLock *        fLock;
 536
 537     virtual bool checkForWork( void );
 538     virtual void free( void );
 539     virtual bool init( IOService * inOwner, Action inAction );
 540
 541 public:
 542     static  IOPMRequestQueue * create( IOService * inOwner, Action inAction );
 543     void    queuePMRequest( IOPMRequest * request );
 544     void    queuePMRequestChain( IOPMRequest ** requests, IOItemCount count );
 545     void    signalWorkAvailable( void );
 546 };
 547
 548 class IOPMWorkQueue : public IOEventSource
 549 {
 550     OSDeclareDefaultStructors( IOPMWorkQueue )
 551
 552 public:
 553     typedef bool (*Action)( IOService *, IOPMRequest *, IOPMWorkQueue * );
 554
 555 protected:
 556     queue_head_t    fWorkQueue;
 557     Action          fWorkAction;
 558     Action          fRetireAction;
 559
 560     virtual bool checkForWork( void );
 561     virtual bool init( IOService * inOwner, Action work, Action retire );
 562
 563 public:
 564     static IOPMWorkQueue * create( IOService * inOwner, Action work, Action retire );
 565     void   queuePMRequest( IOPMRequest * request );
 566 };
 567
 568 #endif /* !_IOKIT_IOSERVICEPMPRIVATE_H */