evgpe.c revision 217365
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 <contrib/dev/acpica/include/acpi.h> 45#include <contrib/dev/acpica/include/accommon.h> 46#include <contrib/dev/acpica/include/acevents.h> 47#include <contrib/dev/acpica/include/acnamesp.h> 48 49#define _COMPONENT ACPI_EVENTS 50 ACPI_MODULE_NAME ("evgpe") 51 52/* Local prototypes */ 53 54static void ACPI_SYSTEM_XFACE 55AcpiEvAsynchExecuteGpeMethod ( 56 void *Context); 57 58static void ACPI_SYSTEM_XFACE 59AcpiEvAsynchEnableGpe ( 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 76ACPI_STATUS 77AcpiEvUpdateGpeEnableMask ( 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 122ACPI_STATUS 123AcpiEvEnableGpe ( 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 172ACPI_STATUS 173AcpiEvAddGpeReference ( 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 221ACPI_STATUS 222AcpiEvRemoveGpeReference ( 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 272ACPI_GPE_EVENT_INFO * 273AcpiEvLowGetGpeInfo ( 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 317ACPI_GPE_EVENT_INFO * 318AcpiEvGetGpeEventInfo ( 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 378UINT32 379AcpiEvGpeDetect ( 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 /* Read the Status Register */ 426 427 Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress); 428 if (ACPI_FAILURE (Status)) 429 { 430 goto UnlockAndExit; 431 } 432 433 /* Read the Enable Register */ 434 435 Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress); 436 if (ACPI_FAILURE (Status)) 437 { 438 goto UnlockAndExit; 439 } 440 441 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, 442 "Read GPE Register at GPE%02X: Status=%02X, Enable=%02X\n", 443 GpeRegisterInfo->BaseGpeNumber, StatusReg, EnableReg)); 444 445 /* Check if there is anything active at all in this register */ 446 447 EnabledStatusByte = (UINT8) (StatusReg & EnableReg); 448 if (!EnabledStatusByte) 449 { 450 /* No active GPEs in this register, move on */ 451 452 continue; 453 } 454 455 /* Now look at the individual GPEs in this byte register */ 456 457 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) 458 { 459 /* Examine one GPE bit */ 460 461 if (EnabledStatusByte & (1 << j)) 462 { 463 /* 464 * Found an active GPE. Dispatch the event to a handler 465 * or method. 466 */ 467 IntStatus |= AcpiEvGpeDispatch (GpeBlock->Node, 468 &GpeBlock->EventInfo[((ACPI_SIZE) i * 469 ACPI_GPE_REGISTER_WIDTH) + j], 470 j + GpeRegisterInfo->BaseGpeNumber); 471 } 472 } 473 } 474 475 GpeBlock = GpeBlock->Next; 476 } 477 478UnlockAndExit: 479 480 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 481 return (IntStatus); 482} 483 484 485/******************************************************************************* 486 * 487 * FUNCTION: AcpiEvAsynchExecuteGpeMethod 488 * 489 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE 490 * 491 * RETURN: None 492 * 493 * DESCRIPTION: Perform the actual execution of a GPE control method. This 494 * function is called from an invocation of AcpiOsExecute and 495 * therefore does NOT execute at interrupt level - so that 496 * the control method itself is not executed in the context of 497 * an interrupt handler. 498 * 499 ******************************************************************************/ 500 501static void ACPI_SYSTEM_XFACE 502AcpiEvAsynchExecuteGpeMethod ( 503 void *Context) 504{ 505 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context; 506 ACPI_STATUS Status; 507 ACPI_GPE_EVENT_INFO *LocalGpeEventInfo; 508 ACPI_EVALUATE_INFO *Info; 509 510 511 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod); 512 513 514 /* Allocate a local GPE block */ 515 516 LocalGpeEventInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO)); 517 if (!LocalGpeEventInfo) 518 { 519 ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY, 520 "while handling a GPE")); 521 return_VOID; 522 } 523 524 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 525 if (ACPI_FAILURE (Status)) 526 { 527 return_VOID; 528 } 529 530 /* Must revalidate the GpeNumber/GpeBlock */ 531 532 if (!AcpiEvValidGpeEvent (GpeEventInfo)) 533 { 534 Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 535 return_VOID; 536 } 537 538 /* 539 * Take a snapshot of the GPE info for this level - we copy the info to 540 * prevent a race condition with RemoveHandler/RemoveBlock. 541 */ 542 ACPI_MEMCPY (LocalGpeEventInfo, GpeEventInfo, 543 sizeof (ACPI_GPE_EVENT_INFO)); 544 545 Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 546 if (ACPI_FAILURE (Status)) 547 { 548 return_VOID; 549 } 550 551 /* Do the correct dispatch - normal method or implicit notify */ 552 553 switch (LocalGpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) 554 { 555 case ACPI_GPE_DISPATCH_NOTIFY: 556 557 /* 558 * Implicit notify. 559 * Dispatch a DEVICE_WAKE notify to the appropriate handler. 560 * NOTE: the request is queued for execution after this method 561 * completes. The notify handlers are NOT invoked synchronously 562 * from this thread -- because handlers may in turn run other 563 * control methods. 564 */ 565 Status = AcpiEvQueueNotifyRequest ( 566 LocalGpeEventInfo->Dispatch.DeviceNode, 567 ACPI_NOTIFY_DEVICE_WAKE); 568 break; 569 570 case ACPI_GPE_DISPATCH_METHOD: 571 572 /* Allocate the evaluation information block */ 573 574 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); 575 if (!Info) 576 { 577 Status = AE_NO_MEMORY; 578 } 579 else 580 { 581 /* 582 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the 583 * _Lxx/_Exx control method that corresponds to this GPE 584 */ 585 Info->PrefixNode = LocalGpeEventInfo->Dispatch.MethodNode; 586 Info->Flags = ACPI_IGNORE_RETURN_VALUE; 587 588 Status = AcpiNsEvaluate (Info); 589 ACPI_FREE (Info); 590 } 591 592 if (ACPI_FAILURE (Status)) 593 { 594 ACPI_EXCEPTION ((AE_INFO, Status, 595 "while evaluating GPE method [%4.4s]", 596 AcpiUtGetNodeName (LocalGpeEventInfo->Dispatch.MethodNode))); 597 } 598 599 break; 600 601 default: 602 return_VOID; /* Should never happen */ 603 } 604 605 /* Defer enabling of GPE until all notify handlers are done */ 606 607 Status = AcpiOsExecute (OSL_NOTIFY_HANDLER, 608 AcpiEvAsynchEnableGpe, LocalGpeEventInfo); 609 if (ACPI_FAILURE (Status)) 610 { 611 ACPI_FREE (LocalGpeEventInfo); 612 } 613 return_VOID; 614} 615 616 617/******************************************************************************* 618 * 619 * FUNCTION: AcpiEvAsynchEnableGpe 620 * 621 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE 622 * Callback from AcpiOsExecute 623 * 624 * RETURN: None 625 * 626 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to 627 * complete (i.e., finish execution of Notify) 628 * 629 ******************************************************************************/ 630 631static void ACPI_SYSTEM_XFACE 632AcpiEvAsynchEnableGpe ( 633 void *Context) 634{ 635 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context; 636 637 638 (void) AcpiEvFinishGpe (GpeEventInfo); 639 640 ACPI_FREE (GpeEventInfo); 641 return; 642} 643 644 645/******************************************************************************* 646 * 647 * FUNCTION: AcpiEvFinishGpe 648 * 649 * PARAMETERS: GpeEventInfo - Info for this GPE 650 * 651 * RETURN: Status 652 * 653 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution 654 * of a GPE method or a synchronous or asynchronous GPE handler. 655 * 656 ******************************************************************************/ 657 658ACPI_STATUS 659AcpiEvFinishGpe ( 660 ACPI_GPE_EVENT_INFO *GpeEventInfo) 661{ 662 ACPI_STATUS Status; 663 664 665 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == 666 ACPI_GPE_LEVEL_TRIGGERED) 667 { 668 /* 669 * GPE is level-triggered, we clear the GPE status bit after 670 * handling the event. 671 */ 672 Status = AcpiHwClearGpe (GpeEventInfo); 673 if (ACPI_FAILURE (Status)) 674 { 675 return (Status); 676 } 677 } 678 679 /* 680 * Enable this GPE, conditionally. This means that the GPE will 681 * only be physically enabled if the EnableForRun bit is set 682 * in the EventInfo. 683 */ 684 (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE); 685 return (AE_OK); 686} 687 688 689/******************************************************************************* 690 * 691 * FUNCTION: AcpiEvGpeDispatch 692 * 693 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1 694 * GpeEventInfo - Info for this GPE 695 * GpeNumber - Number relative to the parent GPE block 696 * 697 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 698 * 699 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) 700 * or method (e.g. _Lxx/_Exx) handler. 701 * 702 * This function executes at interrupt level. 703 * 704 ******************************************************************************/ 705 706UINT32 707AcpiEvGpeDispatch ( 708 ACPI_NAMESPACE_NODE *GpeDevice, 709 ACPI_GPE_EVENT_INFO *GpeEventInfo, 710 UINT32 GpeNumber) 711{ 712 ACPI_STATUS Status; 713 UINT32 ReturnValue; 714 715 716 ACPI_FUNCTION_TRACE (EvGpeDispatch); 717 718 719 /* Invoke global event handler if present */ 720 721 AcpiGpeCount++; 722 if (AcpiGbl_GlobalEventHandler) 723 { 724 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, GpeDevice, 725 GpeNumber, AcpiGbl_GlobalEventHandlerContext); 726 } 727 728 /* 729 * If edge-triggered, clear the GPE status bit now. Note that 730 * level-triggered events are cleared after the GPE is serviced. 731 */ 732 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == 733 ACPI_GPE_EDGE_TRIGGERED) 734 { 735 Status = AcpiHwClearGpe (GpeEventInfo); 736 if (ACPI_FAILURE (Status)) 737 { 738 ACPI_EXCEPTION ((AE_INFO, Status, 739 "Unable to clear GPE%02X", GpeNumber)); 740 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); 741 } 742 } 743 744 /* 745 * Always disable the GPE so that it does not keep firing before 746 * any asynchronous activity completes (either from the execution 747 * of a GPE method or an asynchronous GPE handler.) 748 * 749 * If there is no handler or method to run, just disable the 750 * GPE and leave it disabled permanently to prevent further such 751 * pointless events from firing. 752 */ 753 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); 754 if (ACPI_FAILURE (Status)) 755 { 756 ACPI_EXCEPTION ((AE_INFO, Status, 757 "Unable to disable GPE%02X", GpeNumber)); 758 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); 759 } 760 761 /* 762 * Dispatch the GPE to either an installed handler or the control 763 * method associated with this GPE (_Lxx or _Exx). If a handler 764 * exists, we invoke it and do not attempt to run the method. 765 * If there is neither a handler nor a method, leave the GPE 766 * disabled. 767 */ 768 switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) 769 { 770 case ACPI_GPE_DISPATCH_HANDLER: 771 772 /* Invoke the installed handler (at interrupt level) */ 773 774 ReturnValue = GpeEventInfo->Dispatch.Handler->Address ( 775 GpeDevice, GpeNumber, 776 GpeEventInfo->Dispatch.Handler->Context); 777 778 /* If requested, clear (if level-triggered) and reenable the GPE */ 779 780 if (ReturnValue & ACPI_REENABLE_GPE) 781 { 782 (void) AcpiEvFinishGpe (GpeEventInfo); 783 } 784 break; 785 786 case ACPI_GPE_DISPATCH_METHOD: 787 case ACPI_GPE_DISPATCH_NOTIFY: 788 789 /* 790 * Execute the method associated with the GPE 791 * NOTE: Level-triggered GPEs are cleared after the method completes. 792 */ 793 Status = AcpiOsExecute (OSL_GPE_HANDLER, 794 AcpiEvAsynchExecuteGpeMethod, GpeEventInfo); 795 if (ACPI_FAILURE (Status)) 796 { 797 ACPI_EXCEPTION ((AE_INFO, Status, 798 "Unable to queue handler for GPE%02X - event disabled", 799 GpeNumber)); 800 } 801 break; 802 803 default: 804 805 /* 806 * No handler or method to run! 807 * 03/2010: This case should no longer be possible. We will not allow 808 * a GPE to be enabled if it has no handler or method. 809 */ 810 ACPI_ERROR ((AE_INFO, 811 "No handler or method for GPE%02X, disabling event", 812 GpeNumber)); 813 break; 814 } 815 816 return_UINT32 (ACPI_INTERRUPT_HANDLED); 817} 818 819