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 ---