update to acpica-unix2-20130927
acpica-unix2-20130823
PANKOVs restructure

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpe - General Purpose Event handling and dispatch
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43 
  44 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48 
  49 #define _COMPONENT          ACPI_EVENTS
  50         ACPI_MODULE_NAME    ("evgpe")
  51 


  52 /* Local prototypes */
  53 
  54 static void ACPI_SYSTEM_XFACE
  55 AcpiEvAsynchExecuteGpeMethod (
  56     void                    *Context);
  57 
  58 static void ACPI_SYSTEM_XFACE
  59 AcpiEvAsynchEnableGpe (
  60     void                    *Context);
  61 
  62 
  63 /*******************************************************************************
  64  *
  65  * FUNCTION:    AcpiEvUpdateGpeEnableMask
  66  *
  67  * PARAMETERS:  GpeEventInfo            - GPE to update
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Updates GPE register enable mask based upon whether there are
  72  *              runtime references to this GPE
  73  *
  74  ******************************************************************************/
  75 
  76 ACPI_STATUS
  77 AcpiEvUpdateGpeEnableMask (
  78     ACPI_GPE_EVENT_INFO     *GpeEventInfo)
  79 {
  80     ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
  81     UINT32                  RegisterBit;
  82 
  83 
  84     ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask);
  85 
  86 
  87     GpeRegisterInfo = GpeEventInfo->RegisterInfo;
  88     if (!GpeRegisterInfo)
  89     {
  90         return_ACPI_STATUS (AE_NOT_EXIST);
  91     }
  92 
  93     RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo, GpeRegisterInfo);
  94 
  95     /* Clear the run bit up front */
  96 
  97     ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
  98 
  99     /* Set the mask bit only if there are references to this GPE */
 100 
 101     if (GpeEventInfo->RuntimeCount)
 102     {
 103         ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, (UINT8) RegisterBit);
 104     }
 105 
 106     return_ACPI_STATUS (AE_OK);
 107 }
 108 
 109 
 110 /*******************************************************************************
 111  *
 112  * FUNCTION:    AcpiEvEnableGpe
 113  *
 114  * PARAMETERS:  GpeEventInfo            - GPE to enable
 115  *
 116  * RETURN:      Status
 117  *
 118  * DESCRIPTION: Clear a GPE of stale events and enable it.
 119  *
 120  ******************************************************************************/
 121 
 122 ACPI_STATUS
 123 AcpiEvEnableGpe (
 124     ACPI_GPE_EVENT_INFO     *GpeEventInfo)
 125 {
 126     ACPI_STATUS             Status;
 127 
 128 
 129     ACPI_FUNCTION_TRACE (EvEnableGpe);
 130 
 131 
 132     /*
 133      * We will only allow a GPE to be enabled if it has either an associated
 134      * method (_Lxx/_Exx) or a handler, or is using the implicit notify
 135      * feature. Otherwise, the GPE will be immediately disabled by
 136      * AcpiEvGpeDispatch the first time it fires.
 137      */
 138     if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
 139         ACPI_GPE_DISPATCH_NONE)
 140     {
 141         return_ACPI_STATUS (AE_NO_HANDLER);
 142     }
 143 
 144     /* Clear the GPE (of stale events) */
 145 
 146     Status = AcpiHwClearGpe (GpeEventInfo);
 147     if (ACPI_FAILURE (Status))
 148     {
 149         return_ACPI_STATUS (Status);
 150     }
 151 
 152     /* Enable the requested GPE */
 153 
 154     Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
 155     return_ACPI_STATUS (Status);
 156 }
 157 
 158 
 159 /*******************************************************************************
 160  *
 161  * FUNCTION:    AcpiEvAddGpeReference
 162  *
 163  * PARAMETERS:  GpeEventInfo            - Add a reference to this GPE
 164  *
 165  * RETURN:      Status
 166  *
 167  * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 168  *              hardware-enabled.
 169  *
 170  ******************************************************************************/
 171 
 172 ACPI_STATUS
 173 AcpiEvAddGpeReference (
 174     ACPI_GPE_EVENT_INFO     *GpeEventInfo)
 175 {
 176     ACPI_STATUS             Status = AE_OK;
 177 
 178 
 179     ACPI_FUNCTION_TRACE (EvAddGpeReference);
 180 
 181 
 182     if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX)
 183     {
 184         return_ACPI_STATUS (AE_LIMIT);
 185     }
 186 
 187     GpeEventInfo->RuntimeCount++;
 188     if (GpeEventInfo->RuntimeCount == 1)
 189     {
 190         /* Enable on first reference */
 191 
 192         Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
 193         if (ACPI_SUCCESS (Status))
 194         {
 195             Status = AcpiEvEnableGpe (GpeEventInfo);
 196         }
 197 
 198         if (ACPI_FAILURE (Status))
 199         {
 200             GpeEventInfo->RuntimeCount--;
 201         }
 202     }
 203 
 204     return_ACPI_STATUS (Status);
 205 }
 206 
 207 
 208 /*******************************************************************************
 209  *
 210  * FUNCTION:    AcpiEvRemoveGpeReference
 211  *
 212  * PARAMETERS:  GpeEventInfo            - Remove a reference to this GPE
 213  *
 214  * RETURN:      Status
 215  *
 216  * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 217  *              removed, the GPE is hardware-disabled.
 218  *
 219  ******************************************************************************/
 220 
 221 ACPI_STATUS
 222 AcpiEvRemoveGpeReference (
 223     ACPI_GPE_EVENT_INFO     *GpeEventInfo)
 224 {
 225     ACPI_STATUS             Status = AE_OK;
 226 
 227 
 228     ACPI_FUNCTION_TRACE (EvRemoveGpeReference);
 229 
 230 
 231     if (!GpeEventInfo->RuntimeCount)
 232     {
 233         return_ACPI_STATUS (AE_LIMIT);
 234     }
 235 
 236     GpeEventInfo->RuntimeCount--;
 237     if (!GpeEventInfo->RuntimeCount)
 238     {
 239         /* Disable on last reference */
 240 
 241         Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
 242         if (ACPI_SUCCESS (Status))
 243         {
 244             Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
 245         }
 246 
 247         if (ACPI_FAILURE (Status))
 248         {
 249             GpeEventInfo->RuntimeCount++;
 250         }
 251     }
 252 
 253     return_ACPI_STATUS (Status);
 254 }
 255 
 256 
 257 /*******************************************************************************
 258  *
 259  * FUNCTION:    AcpiEvLowGetGpeInfo
 260  *
 261  * PARAMETERS:  GpeNumber           - Raw GPE number
 262  *              GpeBlock            - A GPE info block
 263  *
 264  * RETURN:      A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
 265  *              is not within the specified GPE block)
 266  *
 267  * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
 268  *              the low-level implementation of EvGetGpeEventInfo.
 269  *
 270  ******************************************************************************/
 271 
 272 ACPI_GPE_EVENT_INFO *
 273 AcpiEvLowGetGpeInfo (
 274     UINT32                  GpeNumber,
 275     ACPI_GPE_BLOCK_INFO     *GpeBlock)
 276 {
 277     UINT32                  GpeIndex;
 278 
 279 
 280     /*
 281      * Validate that the GpeNumber is within the specified GpeBlock.
 282      * (Two steps)
 283      */
 284     if (!GpeBlock ||
 285         (GpeNumber < GpeBlock->BlockBaseNumber))
 286     {
 287         return (NULL);
 288     }
 289 
 290     GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber;
 291     if (GpeIndex >= GpeBlock->GpeCount)
 292     {
 293         return (NULL);
 294     }
 295 
 296     return (&GpeBlock->EventInfo[GpeIndex]);
 297 }
 298 
 299 
 300 /*******************************************************************************
 301  *
 302  * FUNCTION:    AcpiEvGetGpeEventInfo
 303  *
 304  * PARAMETERS:  GpeDevice           - Device node. NULL for GPE0/GPE1
 305  *              GpeNumber           - Raw GPE number
 306  *
 307  * RETURN:      A GPE EventInfo struct. NULL if not a valid GPE
 308  *
 309  * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
 310  *              Validates the GpeBlock and the GpeNumber
 311  *
 312  *              Should be called only when the GPE lists are semaphore locked
 313  *              and not subject to change.
 314  *
 315  ******************************************************************************/
 316 
 317 ACPI_GPE_EVENT_INFO *
 318 AcpiEvGetGpeEventInfo (
 319     ACPI_HANDLE             GpeDevice,
 320     UINT32                  GpeNumber)
 321 {
 322     ACPI_OPERAND_OBJECT     *ObjDesc;
 323     ACPI_GPE_EVENT_INFO     *GpeInfo;
 324     UINT32                  i;
 325 
 326 
 327     ACPI_FUNCTION_ENTRY ();
 328 
 329 
 330     /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
 331 
 332     if (!GpeDevice)
 333     {
 334         /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 335 
 336         for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
 337         {
 338             GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber,
 339                         AcpiGbl_GpeFadtBlocks[i]);
 340             if (GpeInfo)
 341             {
 342                 return (GpeInfo);
 343             }
 344         }
 345 
 346         /* The GpeNumber was not in the range of either FADT GPE block */
 347 
 348         return (NULL);
 349     }
 350 
 351     /* A Non-NULL GpeDevice means this is a GPE Block Device */
 352 
 353     ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice);
 354     if (!ObjDesc ||
 355         !ObjDesc->Device.GpeBlock)
 356     {
 357         return (NULL);
 358     }
 359 
 360     return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock));
 361 }
 362 
 363 
 364 /*******************************************************************************
 365  *
 366  * FUNCTION:    AcpiEvGpeDetect
 367  *
 368  * PARAMETERS:  GpeXruptList        - Interrupt block for this interrupt.
 369  *                                    Can have multiple GPE blocks attached.
 370  *
 371  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 372  *
 373  * DESCRIPTION: Detect if any GP events have occurred. This function is
 374  *              executed at interrupt level.
 375  *
 376  ******************************************************************************/
 377 
 378 UINT32
 379 AcpiEvGpeDetect (
 380     ACPI_GPE_XRUPT_INFO     *GpeXruptList)
 381 {
 382     ACPI_STATUS             Status;
 383     ACPI_GPE_BLOCK_INFO     *GpeBlock;
 384     ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
 385     UINT32                  IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
 386     UINT8                   EnabledStatusByte;
 387     UINT32                  StatusReg;
 388     UINT32                  EnableReg;
 389     ACPI_CPU_FLAGS          Flags;
 390     UINT32                  i;
 391     UINT32                  j;
 392 
 393 
 394     ACPI_FUNCTION_NAME (EvGpeDetect);
 395 
 396     /* Check for the case where there are no GPEs */
 397 
 398     if (!GpeXruptList)
 399     {
 400         return (IntStatus);
 401     }
 402 
 403     /*
 404      * We need to obtain the GPE lock for both the data structs and registers
 405      * Note: Not necessary to obtain the hardware lock, since the GPE
 406      * registers are owned by the GpeLock.
 407      */
 408     Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
 409 
 410     /* Examine all GPE blocks attached to this interrupt level */
 411 
 412     GpeBlock = GpeXruptList->GpeBlockListHead;
 413     while (GpeBlock)
 414     {
 415         /*
 416          * Read all of the 8-bit GPE status and enable registers in this GPE
 417          * block, saving all of them. Find all currently active GP events.
 418          */
 419         for (i = 0; i < GpeBlock->RegisterCount; i++)
 420         {
 421             /* Get the next status/enable pair */
 422 
 423             GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
 424 
 425             /*
 426              * Optimization: If there are no GPEs enabled within this
 427              * register, we can safely ignore the entire register.
 428              */
 429             if (!(GpeRegisterInfo->EnableForRun |
 430                   GpeRegisterInfo->EnableForWake))
 431             {







 432                 continue;
 433             }
 434 
 435             /* Read the Status Register */
 436 
 437             Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress);
 438             if (ACPI_FAILURE (Status))
 439             {
 440                 goto UnlockAndExit;
 441             }
 442 
 443             /* Read the Enable Register */
 444 
 445             Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress);
 446             if (ACPI_FAILURE (Status))
 447             {
 448                 goto UnlockAndExit;
 449             }
 450 
 451             ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
 452                 "Read GPE Register at GPE%02X: Status=%02X, Enable=%02X\n",
 453                 GpeRegisterInfo->BaseGpeNumber, StatusReg, EnableReg));





 454 
 455             /* Check if there is anything active at all in this register */
 456 
 457             EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
 458             if (!EnabledStatusByte)
 459             {
 460                 /* No active GPEs in this register, move on */
 461 
 462                 continue;
 463             }
 464 
 465             /* Now look at the individual GPEs in this byte register */
 466 
 467             for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
 468             {
 469                 /* Examine one GPE bit */
 470 
 471                 if (EnabledStatusByte & (1 << j))
 472                 {
 473                     /*
 474                      * Found an active GPE. Dispatch the event to a handler
 475                      * or method.
 476                      */
 477                     IntStatus |= AcpiEvGpeDispatch (GpeBlock->Node,
 478                         &GpeBlock->EventInfo[((ACPI_SIZE) i *
 479                             ACPI_GPE_REGISTER_WIDTH) + j],
 480                         j + GpeRegisterInfo->BaseGpeNumber);
 481                 }
 482             }
 483         }
 484 
 485         GpeBlock = GpeBlock->Next;
 486     }
 487 
 488 UnlockAndExit:
 489 
 490     AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
 491     return (IntStatus);
 492 }
 493 
 494 
 495 /*******************************************************************************
 496  *
 497  * FUNCTION:    AcpiEvAsynchExecuteGpeMethod
 498  *
 499  * PARAMETERS:  Context (GpeEventInfo) - Info for this GPE
 500  *
 501  * RETURN:      None
 502  *
 503  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 504  *              function is called from an invocation of AcpiOsExecute and
 505  *              therefore does NOT execute at interrupt level - so that
 506  *              the control method itself is not executed in the context of
 507  *              an interrupt handler.
 508  *
 509  ******************************************************************************/
 510 
 511 static void ACPI_SYSTEM_XFACE
 512 AcpiEvAsynchExecuteGpeMethod (
 513     void                    *Context)
 514 {
 515     ACPI_GPE_EVENT_INFO     *GpeEventInfo = Context;
 516     ACPI_STATUS             Status;
 517     ACPI_GPE_EVENT_INFO     *LocalGpeEventInfo;
 518     ACPI_EVALUATE_INFO      *Info;

 519 
 520 
 521     ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod);
 522 
 523 
 524     /* Allocate a local GPE block */
 525 
 526     LocalGpeEventInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO));
 527     if (!LocalGpeEventInfo)
 528     {
 529         ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY,
 530             "while handling a GPE"));
 531         return_VOID;
 532     }
 533 
 534     Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
 535     if (ACPI_FAILURE (Status))
 536     {

 537         return_VOID;
 538     }
 539 
 540     /* Must revalidate the GpeNumber/GpeBlock */
 541 
 542     if (!AcpiEvValidGpeEvent (GpeEventInfo))
 543     {
 544         Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);

 545         return_VOID;
 546     }
 547 
 548     /*
 549      * Take a snapshot of the GPE info for this level - we copy the info to
 550      * prevent a race condition with RemoveHandler/RemoveBlock.
 551      */
 552     ACPI_MEMCPY (LocalGpeEventInfo, GpeEventInfo,
 553         sizeof (ACPI_GPE_EVENT_INFO));
 554 
 555     Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
 556     if (ACPI_FAILURE (Status))
 557     {

 558         return_VOID;
 559     }
 560 
 561     /* Do the correct dispatch - normal method or implicit notify */
 562 
 563     switch (LocalGpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
 564     {
 565     case ACPI_GPE_DISPATCH_NOTIFY:
 566 
 567         /*
 568          * Implicit notify.
 569          * Dispatch a DEVICE_WAKE notify to the appropriate handler.
 570          * NOTE: the request is queued for execution after this method
 571          * completes. The notify handlers are NOT invoked synchronously
 572          * from this thread -- because handlers may in turn run other
 573          * control methods.



 574          */
 575         Status = AcpiEvQueueNotifyRequest (
 576                     LocalGpeEventInfo->Dispatch.DeviceNode,


 577                     ACPI_NOTIFY_DEVICE_WAKE);



 578         break;
 579 
 580     case ACPI_GPE_DISPATCH_METHOD:
 581 
 582         /* Allocate the evaluation information block */
 583 
 584         Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
 585         if (!Info)
 586         {
 587             Status = AE_NO_MEMORY;
 588         }
 589         else
 590         {
 591             /*
 592              * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
 593              * _Lxx/_Exx control method that corresponds to this GPE
 594              */
 595             Info->PrefixNode = LocalGpeEventInfo->Dispatch.MethodNode;
 596             Info->Flags = ACPI_IGNORE_RETURN_VALUE;
 597 
 598             Status = AcpiNsEvaluate (Info);
 599             ACPI_FREE (Info);
 600         }
 601 
 602         if (ACPI_FAILURE (Status))
 603         {
 604             ACPI_EXCEPTION ((AE_INFO, Status,
 605                 "while evaluating GPE method [%4.4s]",
 606                 AcpiUtGetNodeName (LocalGpeEventInfo->Dispatch.MethodNode)));
 607         }
 608 
 609         break;
 610 
 611     default:

 612         return_VOID; /* Should never happen */
 613     }
 614 
 615     /* Defer enabling of GPE until all notify handlers are done */
 616 
 617     Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
 618                 AcpiEvAsynchEnableGpe, LocalGpeEventInfo);
 619     if (ACPI_FAILURE (Status))
 620     {
 621         ACPI_FREE (LocalGpeEventInfo);
 622     }
 623     return_VOID;
 624 }
 625 
 626 
 627 /*******************************************************************************
 628  *
 629  * FUNCTION:    AcpiEvAsynchEnableGpe
 630  *
 631  * PARAMETERS:  Context (GpeEventInfo) - Info for this GPE
 632  *              Callback from AcpiOsExecute
 633  *
 634  * RETURN:      None
 635  *
 636  * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
 637  *              complete (i.e., finish execution of Notify)
 638  *
 639  ******************************************************************************/
 640 
 641 static void ACPI_SYSTEM_XFACE
 642 AcpiEvAsynchEnableGpe (
 643     void                    *Context)
 644 {
 645     ACPI_GPE_EVENT_INFO     *GpeEventInfo = Context;
 646 
 647 
 648     (void) AcpiEvFinishGpe (GpeEventInfo);
 649 
 650     ACPI_FREE (GpeEventInfo);
 651     return;
 652 }
 653 
 654 
 655 /*******************************************************************************
 656  *
 657  * FUNCTION:    AcpiEvFinishGpe
 658  *
 659  * PARAMETERS:  GpeEventInfo        - Info for this GPE
 660  *
 661  * RETURN:      Status
 662  *
 663  * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
 664  *              of a GPE method or a synchronous or asynchronous GPE handler.
 665  *
 666  ******************************************************************************/
 667 
 668 ACPI_STATUS
 669 AcpiEvFinishGpe (
 670     ACPI_GPE_EVENT_INFO     *GpeEventInfo)
 671 {
 672     ACPI_STATUS             Status;
 673 
 674 
 675     if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 676             ACPI_GPE_LEVEL_TRIGGERED)
 677     {
 678         /*
 679          * GPE is level-triggered, we clear the GPE status bit after
 680          * handling the event.
 681          */
 682         Status = AcpiHwClearGpe (GpeEventInfo);
 683         if (ACPI_FAILURE (Status))
 684         {
 685             return (Status);
 686         }
 687     }
 688 
 689     /*
 690      * Enable this GPE, conditionally. This means that the GPE will
 691      * only be physically enabled if the EnableForRun bit is set
 692      * in the EventInfo.
 693      */
 694     (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
 695     return (AE_OK);
 696 }
 697 
 698 
 699 /*******************************************************************************
 700  *
 701  * FUNCTION:    AcpiEvGpeDispatch
 702  *
 703  * PARAMETERS:  GpeDevice           - Device node. NULL for GPE0/GPE1
 704  *              GpeEventInfo        - Info for this GPE
 705  *              GpeNumber           - Number relative to the parent GPE block
 706  *
 707  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 708  *
 709  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 710  *              or method (e.g. _Lxx/_Exx) handler.
 711  *
 712  *              This function executes at interrupt level.
 713  *
 714  ******************************************************************************/
 715 
 716 UINT32
 717 AcpiEvGpeDispatch (
 718     ACPI_NAMESPACE_NODE     *GpeDevice,
 719     ACPI_GPE_EVENT_INFO     *GpeEventInfo,
 720     UINT32                  GpeNumber)
 721 {
 722     ACPI_STATUS             Status;
 723     UINT32                  ReturnValue;
 724 
 725 
 726     ACPI_FUNCTION_TRACE (EvGpeDispatch);
 727 
 728 
 729     /* Invoke global event handler if present */
 730 
 731     AcpiGpeCount++;
 732     if (AcpiGbl_GlobalEventHandler)
 733     {
 734         AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, GpeDevice,
 735              GpeNumber, AcpiGbl_GlobalEventHandlerContext);
 736     }
 737 
 738     /*
 739      * If edge-triggered, clear the GPE status bit now. Note that
 740      * level-triggered events are cleared after the GPE is serviced.
 741      */
 742     if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 743             ACPI_GPE_EDGE_TRIGGERED)
 744     {
 745         Status = AcpiHwClearGpe (GpeEventInfo);
 746         if (ACPI_FAILURE (Status))
 747         {
 748             ACPI_EXCEPTION ((AE_INFO, Status,
 749                 "Unable to clear GPE%02X", GpeNumber));
 750             return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
 751         }
 752     }
 753 
 754     /*
 755      * Always disable the GPE so that it does not keep firing before
 756      * any asynchronous activity completes (either from the execution
 757      * of a GPE method or an asynchronous GPE handler.)
 758      *
 759      * If there is no handler or method to run, just disable the
 760      * GPE and leave it disabled permanently to prevent further such
 761      * pointless events from firing.
 762      */
 763     Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
 764     if (ACPI_FAILURE (Status))
 765     {
 766         ACPI_EXCEPTION ((AE_INFO, Status,
 767             "Unable to disable GPE%02X", GpeNumber));
 768         return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
 769     }
 770 
 771     /*
 772      * Dispatch the GPE to either an installed handler or the control
 773      * method associated with this GPE (_Lxx or _Exx). If a handler
 774      * exists, we invoke it and do not attempt to run the method.
 775      * If there is neither a handler nor a method, leave the GPE
 776      * disabled.
 777      */
 778     switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
 779     {
 780     case ACPI_GPE_DISPATCH_HANDLER:
 781 
 782         /* Invoke the installed handler (at interrupt level) */
 783 
 784         ReturnValue = GpeEventInfo->Dispatch.Handler->Address (
 785             GpeDevice, GpeNumber,
 786             GpeEventInfo->Dispatch.Handler->Context);
 787 
 788         /* If requested, clear (if level-triggered) and reenable the GPE */
 789 
 790         if (ReturnValue & ACPI_REENABLE_GPE)
 791         {
 792             (void) AcpiEvFinishGpe (GpeEventInfo);
 793         }
 794         break;
 795 
 796     case ACPI_GPE_DISPATCH_METHOD:
 797     case ACPI_GPE_DISPATCH_NOTIFY:
 798 
 799         /*
 800          * Execute the method associated with the GPE
 801          * NOTE: Level-triggered GPEs are cleared after the method completes.
 802          */
 803         Status = AcpiOsExecute (OSL_GPE_HANDLER,
 804                     AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
 805         if (ACPI_FAILURE (Status))
 806         {
 807             ACPI_EXCEPTION ((AE_INFO, Status,
 808                 "Unable to queue handler for GPE%02X - event disabled",
 809                 GpeNumber));
 810         }
 811         break;
 812 
 813     default:
 814 
 815         /*
 816          * No handler or method to run!
 817          * 03/2010: This case should no longer be possible. We will not allow
 818          * a GPE to be enabled if it has no handler or method.
 819          */
 820         ACPI_ERROR ((AE_INFO,
 821             "No handler or method for GPE%02X, disabling event",
 822             GpeNumber));
 823         break;
 824     }
 825 
 826     return_UINT32 (ACPI_INTERRUPT_HANDLED);
 827 }
 828 

--- EOF ---