1 /****************************************************************************** 2 * 3 * Module Name: evgpe - General Purpose Event handling and dispatch 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 53 54 /* Local prototypes */ 55 56 static void ACPI_SYSTEM_XFACE 57 AcpiEvAsynchExecuteGpeMethod ( 58 void *Context); 59 60 static void ACPI_SYSTEM_XFACE 61 AcpiEvAsynchEnableGpe ( 62 void *Context); 63 64 65 /******************************************************************************* 66 * 67 * FUNCTION: AcpiEvUpdateGpeEnableMask 68 * 69 * PARAMETERS: GpeEventInfo - GPE to update 70 * 71 * RETURN: Status 72 * 73 * DESCRIPTION: Updates GPE register enable mask based upon whether there are 74 * runtime references to this GPE 75 * 76 ******************************************************************************/ 77 78 ACPI_STATUS 79 AcpiEvUpdateGpeEnableMask ( 80 ACPI_GPE_EVENT_INFO *GpeEventInfo) 81 { 82 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; 83 UINT32 RegisterBit; 84 85 86 ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask); 87 88 89 GpeRegisterInfo = GpeEventInfo->RegisterInfo; 90 if (!GpeRegisterInfo) 91 { 92 return_ACPI_STATUS (AE_NOT_EXIST); 93 } 94 95 RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo); 96 97 /* Clear the run bit up front */ 98 99 ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit); 100 101 /* Set the mask bit only if there are references to this GPE */ 102 103 if (GpeEventInfo->RuntimeCount) 104 { 105 ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, (UINT8) RegisterBit); 106 } 107 108 GpeRegisterInfo->EnableMask = GpeRegisterInfo->EnableForRun; 109 return_ACPI_STATUS (AE_OK); 110 } 111 112 113 /******************************************************************************* 114 * 115 * FUNCTION: AcpiEvEnableGpe 116 * 117 * PARAMETERS: GpeEventInfo - GPE to enable 118 * 119 * RETURN: Status 120 * 121 * DESCRIPTION: Clear a GPE of stale events and enable it. 122 * 123 ******************************************************************************/ 124 125 ACPI_STATUS 126 AcpiEvEnableGpe ( 127 ACPI_GPE_EVENT_INFO *GpeEventInfo) 128 { 129 ACPI_STATUS Status; 130 131 132 ACPI_FUNCTION_TRACE (EvEnableGpe); 133 134 135 /* Clear the GPE (of stale events) */ 136 137 Status = AcpiHwClearGpe (GpeEventInfo); 138 if (ACPI_FAILURE (Status)) 139 { 140 return_ACPI_STATUS (Status); 141 } 142 143 /* Enable the requested GPE */ 144 145 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE); 146 return_ACPI_STATUS (Status); 147 } 148 149 150 /******************************************************************************* 151 * 152 * FUNCTION: AcpiEvAddGpeReference 153 * 154 * PARAMETERS: GpeEventInfo - Add a reference to this GPE 155 * 156 * RETURN: Status 157 * 158 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is 159 * hardware-enabled. 160 * 161 ******************************************************************************/ 162 163 ACPI_STATUS 164 AcpiEvAddGpeReference ( 165 ACPI_GPE_EVENT_INFO *GpeEventInfo) 166 { 167 ACPI_STATUS Status = AE_OK; 168 169 170 ACPI_FUNCTION_TRACE (EvAddGpeReference); 171 172 173 if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX) 174 { 175 return_ACPI_STATUS (AE_LIMIT); 176 } 177 178 GpeEventInfo->RuntimeCount++; 179 if (GpeEventInfo->RuntimeCount == 1) 180 { 181 /* Enable on first reference */ 182 183 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo); 184 if (ACPI_SUCCESS (Status)) 185 { 186 Status = AcpiEvEnableGpe (GpeEventInfo); 187 } 188 189 if (ACPI_FAILURE (Status)) 190 { 191 GpeEventInfo->RuntimeCount--; 192 } 193 } 194 195 return_ACPI_STATUS (Status); 196 } 197 198 199 /******************************************************************************* 200 * 201 * FUNCTION: AcpiEvRemoveGpeReference 202 * 203 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE 204 * 205 * RETURN: Status 206 * 207 * DESCRIPTION: Remove a reference to a GPE. When the last reference is 208 * removed, the GPE is hardware-disabled. 209 * 210 ******************************************************************************/ 211 212 ACPI_STATUS 213 AcpiEvRemoveGpeReference ( 214 ACPI_GPE_EVENT_INFO *GpeEventInfo) 215 { 216 ACPI_STATUS Status = AE_OK; 217 218 219 ACPI_FUNCTION_TRACE (EvRemoveGpeReference); 220 221 222 if (!GpeEventInfo->RuntimeCount) 223 { 224 return_ACPI_STATUS (AE_LIMIT); 225 } 226 227 GpeEventInfo->RuntimeCount--; 228 if (!GpeEventInfo->RuntimeCount) 229 { 230 /* Disable on last reference */ 231 232 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo); 233 if (ACPI_SUCCESS (Status)) 234 { 235 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); 236 } 237 238 if (ACPI_FAILURE (Status)) 239 { 240 GpeEventInfo->RuntimeCount++; 241 } 242 } 243 244 return_ACPI_STATUS (Status); 245 } 246 247 248 /******************************************************************************* 249 * 250 * FUNCTION: AcpiEvLowGetGpeInfo 251 * 252 * PARAMETERS: GpeNumber - Raw GPE number 253 * GpeBlock - A GPE info block 254 * 255 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber 256 * is not within the specified GPE block) 257 * 258 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is 259 * the low-level implementation of EvGetGpeEventInfo. 260 * 261 ******************************************************************************/ 262 263 ACPI_GPE_EVENT_INFO * 264 AcpiEvLowGetGpeInfo ( 265 UINT32 GpeNumber, 266 ACPI_GPE_BLOCK_INFO *GpeBlock) 267 { 268 UINT32 GpeIndex; 269 270 271 /* 272 * Validate that the GpeNumber is within the specified GpeBlock. 273 * (Two steps) 274 */ 275 if (!GpeBlock || 276 (GpeNumber < GpeBlock->BlockBaseNumber)) 277 { 278 return (NULL); 279 } 280 281 GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber; 282 if (GpeIndex >= GpeBlock->GpeCount) 283 { 284 return (NULL); 285 } 286 287 return (&GpeBlock->EventInfo[GpeIndex]); 288 } 289 290 291 /******************************************************************************* 292 * 293 * FUNCTION: AcpiEvGetGpeEventInfo 294 * 295 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1 296 * GpeNumber - Raw GPE number 297 * 298 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE 299 * 300 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. 301 * Validates the GpeBlock and the GpeNumber 302 * 303 * Should be called only when the GPE lists are semaphore locked 304 * and not subject to change. 305 * 306 ******************************************************************************/ 307 308 ACPI_GPE_EVENT_INFO * 309 AcpiEvGetGpeEventInfo ( 310 ACPI_HANDLE GpeDevice, 311 UINT32 GpeNumber) 312 { 313 ACPI_OPERAND_OBJECT *ObjDesc; 314 ACPI_GPE_EVENT_INFO *GpeInfo; 315 UINT32 i; 316 317 318 ACPI_FUNCTION_ENTRY (); 319 320 321 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */ 322 323 if (!GpeDevice) 324 { 325 /* Examine GPE Block 0 and 1 (These blocks are permanent) */ 326 327 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) 328 { 329 GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber, 330 AcpiGbl_GpeFadtBlocks[i]); 331 if (GpeInfo) 332 { 333 return (GpeInfo); 334 } 335 } 336 337 /* The GpeNumber was not in the range of either FADT GPE block */ 338 339 return (NULL); 340 } 341 342 /* A Non-NULL GpeDevice means this is a GPE Block Device */ 343 344 ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice); 345 if (!ObjDesc || 346 !ObjDesc->Device.GpeBlock) 347 { 348 return (NULL); 349 } 350 351 return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock)); 352 } 353 354 355 /******************************************************************************* 356 * 357 * FUNCTION: AcpiEvGpeDetect 358 * 359 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt. 360 * Can have multiple GPE blocks attached. 361 * 362 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 363 * 364 * DESCRIPTION: Detect if any GP events have occurred. This function is 365 * executed at interrupt level. 366 * 367 ******************************************************************************/ 368 369 UINT32 370 AcpiEvGpeDetect ( 371 ACPI_GPE_XRUPT_INFO *GpeXruptList) 372 { 373 ACPI_STATUS Status; 374 ACPI_GPE_BLOCK_INFO *GpeBlock; 375 ACPI_NAMESPACE_NODE *GpeDevice; 376 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; 377 ACPI_GPE_EVENT_INFO *GpeEventInfo; 378 UINT32 GpeNumber; 379 ACPI_GPE_HANDLER_INFO *GpeHandlerInfo; 380 UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED; 381 UINT8 EnabledStatusByte; 382 UINT32 StatusReg; 383 UINT32 EnableReg; 384 ACPI_CPU_FLAGS Flags; 385 UINT32 i; 386 UINT32 j; 387 388 389 ACPI_FUNCTION_NAME (EvGpeDetect); 390 391 /* Check for the case where there are no GPEs */ 392 393 if (!GpeXruptList) 394 { 395 return (IntStatus); 396 } 397 398 /* 399 * We need to obtain the GPE lock for both the data structs and registers 400 * Note: Not necessary to obtain the hardware lock, since the GPE 401 * registers are owned by the GpeLock. 402 */ 403 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 404 405 /* Examine all GPE blocks attached to this interrupt level */ 406 407 GpeBlock = GpeXruptList->GpeBlockListHead; 408 while (GpeBlock) 409 { 410 GpeDevice = GpeBlock->Node; 411 412 /* 413 * Read all of the 8-bit GPE status and enable registers in this GPE 414 * block, saving all of them. Find all currently active GP events. 415 */ 416 for (i = 0; i < GpeBlock->RegisterCount; i++) 417 { 418 /* Get the next status/enable pair */ 419 420 GpeRegisterInfo = &GpeBlock->RegisterInfo[i]; 421 422 /* 423 * Optimization: If there are no GPEs enabled within this 424 * register, we can safely ignore the entire register. 425 */ 426 if (!(GpeRegisterInfo->EnableForRun | 427 GpeRegisterInfo->EnableForWake)) 428 { 429 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, 430 "Ignore disabled registers for GPE %02X-%02X: " 431 "RunEnable=%02X, WakeEnable=%02X\n", 432 GpeRegisterInfo->BaseGpeNumber, 433 GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1), 434 GpeRegisterInfo->EnableForRun, 435 GpeRegisterInfo->EnableForWake)); 436 continue; 437 } 438 439 /* Read the Status Register */ 440 441 Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress); 442 if (ACPI_FAILURE (Status)) 443 { 444 goto UnlockAndExit; 445 } 446 447 /* Read the Enable Register */ 448 449 Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress); 450 if (ACPI_FAILURE (Status)) 451 { 452 goto UnlockAndExit; 453 } 454 455 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, 456 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, " 457 "RunEnable=%02X, WakeEnable=%02X\n", 458 GpeRegisterInfo->BaseGpeNumber, 459 GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1), 460 StatusReg, EnableReg, 461 GpeRegisterInfo->EnableForRun, 462 GpeRegisterInfo->EnableForWake)); 463 464 /* Check if there is anything active at all in this register */ 465 466 EnabledStatusByte = (UINT8) (StatusReg & EnableReg); 467 if (!EnabledStatusByte) 468 { 469 /* No active GPEs in this register, move on */ 470 471 continue; 472 } 473 474 /* Now look at the individual GPEs in this byte register */ 475 476 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) 477 { 478 /* Examine one GPE bit */ 479 480 GpeEventInfo = &GpeBlock->EventInfo[((ACPI_SIZE) i * 481 ACPI_GPE_REGISTER_WIDTH) + j]; 482 GpeNumber = j + GpeRegisterInfo->BaseGpeNumber; 483 484 if (EnabledStatusByte & (1 << j)) 485 { 486 /* Invoke global event handler if present */ 487 488 AcpiGpeCount++; 489 if (AcpiGbl_GlobalEventHandler) 490 { 491 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, 492 GpeDevice, GpeNumber, 493 AcpiGbl_GlobalEventHandlerContext); 494 } 495 496 /* Found an active GPE */ 497 498 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) == 499 ACPI_GPE_DISPATCH_RAW_HANDLER) 500 { 501 /* Dispatch the event to a raw handler */ 502 503 GpeHandlerInfo = GpeEventInfo->Dispatch.Handler; 504 505 /* 506 * There is no protection around the namespace node 507 * and the GPE handler to ensure a safe destruction 508 * because: 509 * 1. The namespace node is expected to always 510 * exist after loading a table. 511 * 2. The GPE handler is expected to be flushed by 512 * AcpiOsWaitEventsComplete() before the 513 * destruction. 514 */ 515 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 516 IntStatus |= GpeHandlerInfo->Address ( 517 GpeDevice, GpeNumber, GpeHandlerInfo->Context); 518 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 519 } 520 else 521 { 522 /* 523 * Dispatch the event to a standard handler or 524 * method. 525 */ 526 IntStatus |= AcpiEvGpeDispatch (GpeDevice, 527 GpeEventInfo, GpeNumber); 528 } 529 } 530 } 531 } 532 533 GpeBlock = GpeBlock->Next; 534 } 535 536 UnlockAndExit: 537 538 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 539 return (IntStatus); 540 } 541 542 543 /******************************************************************************* 544 * 545 * FUNCTION: AcpiEvAsynchExecuteGpeMethod 546 * 547 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE 548 * 549 * RETURN: None 550 * 551 * DESCRIPTION: Perform the actual execution of a GPE control method. This 552 * function is called from an invocation of AcpiOsExecute and 553 * therefore does NOT execute at interrupt level - so that 554 * the control method itself is not executed in the context of 555 * an interrupt handler. 556 * 557 ******************************************************************************/ 558 559 static void ACPI_SYSTEM_XFACE 560 AcpiEvAsynchExecuteGpeMethod ( 561 void *Context) 562 { 563 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context; 564 ACPI_STATUS Status = AE_OK; 565 ACPI_EVALUATE_INFO *Info; 566 ACPI_GPE_NOTIFY_INFO *Notify; 567 568 569 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod); 570 571 572 /* Do the correct dispatch - normal method or implicit notify */ 573 574 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags)) 575 { 576 case ACPI_GPE_DISPATCH_NOTIFY: 577 /* 578 * Implicit notify. 579 * Dispatch a DEVICE_WAKE notify to the appropriate handler. 580 * NOTE: the request is queued for execution after this method 581 * completes. The notify handlers are NOT invoked synchronously 582 * from this thread -- because handlers may in turn run other 583 * control methods. 584 * 585 * June 2012: Expand implicit notify mechanism to support 586 * notifies on multiple device objects. 587 */ 588 Notify = GpeEventInfo->Dispatch.NotifyList; 589 while (ACPI_SUCCESS (Status) && Notify) 590 { 591 Status = AcpiEvQueueNotifyRequest ( 592 Notify->DeviceNode, ACPI_NOTIFY_DEVICE_WAKE); 593 594 Notify = Notify->Next; 595 } 596 break; 597 598 case ACPI_GPE_DISPATCH_METHOD: 599 600 /* Allocate the evaluation information block */ 601 602 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); 603 if (!Info) 604 { 605 Status = AE_NO_MEMORY; 606 } 607 else 608 { 609 /* 610 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the 611 * _Lxx/_Exx control method that corresponds to this GPE 612 */ 613 Info->PrefixNode = GpeEventInfo->Dispatch.MethodNode; 614 Info->Flags = ACPI_IGNORE_RETURN_VALUE; 615 616 Status = AcpiNsEvaluate (Info); 617 ACPI_FREE (Info); 618 } 619 620 if (ACPI_FAILURE (Status)) 621 { 622 ACPI_EXCEPTION ((AE_INFO, Status, 623 "while evaluating GPE method [%4.4s]", 624 AcpiUtGetNodeName (GpeEventInfo->Dispatch.MethodNode))); 625 } 626 break; 627 628 default: 629 630 goto ErrorExit; /* Should never happen */ 631 } 632 633 /* Defer enabling of GPE until all notify handlers are done */ 634 635 Status = AcpiOsExecute (OSL_NOTIFY_HANDLER, 636 AcpiEvAsynchEnableGpe, GpeEventInfo); 637 if (ACPI_SUCCESS (Status)) 638 { 639 return_VOID; 640 } 641 642 ErrorExit: 643 AcpiEvAsynchEnableGpe (GpeEventInfo); 644 return_VOID; 645 } 646 647 648 /******************************************************************************* 649 * 650 * FUNCTION: AcpiEvAsynchEnableGpe 651 * 652 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE 653 * Callback from AcpiOsExecute 654 * 655 * RETURN: None 656 * 657 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to 658 * complete (i.e., finish execution of Notify) 659 * 660 ******************************************************************************/ 661 662 static void ACPI_SYSTEM_XFACE 663 AcpiEvAsynchEnableGpe ( 664 void *Context) 665 { 666 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context; 667 ACPI_CPU_FLAGS Flags; 668 669 670 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); 671 (void) AcpiEvFinishGpe (GpeEventInfo); 672 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); 673 674 return; 675 } 676 677 678 /******************************************************************************* 679 * 680 * FUNCTION: AcpiEvFinishGpe 681 * 682 * PARAMETERS: GpeEventInfo - Info for this GPE 683 * 684 * RETURN: Status 685 * 686 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution 687 * of a GPE method or a synchronous or asynchronous GPE handler. 688 * 689 ******************************************************************************/ 690 691 ACPI_STATUS 692 AcpiEvFinishGpe ( 693 ACPI_GPE_EVENT_INFO *GpeEventInfo) 694 { 695 ACPI_STATUS Status; 696 697 698 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == 699 ACPI_GPE_LEVEL_TRIGGERED) 700 { 701 /* 702 * GPE is level-triggered, we clear the GPE status bit after 703 * handling the event. 704 */ 705 Status = AcpiHwClearGpe (GpeEventInfo); 706 if (ACPI_FAILURE (Status)) 707 { 708 return (Status); 709 } 710 } 711 712 /* 713 * Enable this GPE, conditionally. This means that the GPE will 714 * only be physically enabled if the EnableMask bit is set 715 * in the EventInfo. 716 */ 717 (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE); 718 return (AE_OK); 719 } 720 721 722 /******************************************************************************* 723 * 724 * FUNCTION: AcpiEvGpeDispatch 725 * 726 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1 727 * GpeEventInfo - Info for this GPE 728 * GpeNumber - Number relative to the parent GPE block 729 * 730 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 731 * 732 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) 733 * or method (e.g. _Lxx/_Exx) handler. 734 * 735 * This function executes at interrupt level. 736 * 737 ******************************************************************************/ 738 739 UINT32 740 AcpiEvGpeDispatch ( 741 ACPI_NAMESPACE_NODE *GpeDevice, 742 ACPI_GPE_EVENT_INFO *GpeEventInfo, 743 UINT32 GpeNumber) 744 { 745 ACPI_STATUS Status; 746 UINT32 ReturnValue; 747 748 749 ACPI_FUNCTION_TRACE (EvGpeDispatch); 750 751 752 /* 753 * Always disable the GPE so that it does not keep firing before 754 * any asynchronous activity completes (either from the execution 755 * of a GPE method or an asynchronous GPE handler.) 756 * 757 * If there is no handler or method to run, just disable the 758 * GPE and leave it disabled permanently to prevent further such 759 * pointless events from firing. 760 */ 761 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); 762 if (ACPI_FAILURE (Status)) 763 { 764 ACPI_EXCEPTION ((AE_INFO, Status, 765 "Unable to disable GPE %02X", GpeNumber)); 766 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); 767 } 768 769 /* 770 * If edge-triggered, clear the GPE status bit now. Note that 771 * level-triggered events are cleared after the GPE is serviced. 772 */ 773 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == 774 ACPI_GPE_EDGE_TRIGGERED) 775 { 776 Status = AcpiHwClearGpe (GpeEventInfo); 777 if (ACPI_FAILURE (Status)) 778 { 779 ACPI_EXCEPTION ((AE_INFO, Status, 780 "Unable to clear GPE %02X", GpeNumber)); 781 (void) AcpiHwLowSetGpe ( 782 GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE); 783 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); 784 } 785 } 786 787 /* 788 * Dispatch the GPE to either an installed handler or the control 789 * method associated with this GPE (_Lxx or _Exx). If a handler 790 * exists, we invoke it and do not attempt to run the method. 791 * If there is neither a handler nor a method, leave the GPE 792 * disabled. 793 */ 794 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags)) 795 { 796 case ACPI_GPE_DISPATCH_HANDLER: 797 798 /* Invoke the installed handler (at interrupt level) */ 799 800 ReturnValue = GpeEventInfo->Dispatch.Handler->Address ( 801 GpeDevice, GpeNumber, 802 GpeEventInfo->Dispatch.Handler->Context); 803 804 /* If requested, clear (if level-triggered) and reenable the GPE */ 805 806 if (ReturnValue & ACPI_REENABLE_GPE) 807 { 808 (void) AcpiEvFinishGpe (GpeEventInfo); 809 } 810 break; 811 812 case ACPI_GPE_DISPATCH_METHOD: 813 case ACPI_GPE_DISPATCH_NOTIFY: 814 /* 815 * Execute the method associated with the GPE 816 * NOTE: Level-triggered GPEs are cleared after the method completes. 817 */ 818 Status = AcpiOsExecute (OSL_GPE_HANDLER, 819 AcpiEvAsynchExecuteGpeMethod, GpeEventInfo); 820 if (ACPI_FAILURE (Status)) 821 { 822 ACPI_EXCEPTION ((AE_INFO, Status, 823 "Unable to queue handler for GPE %02X - event disabled", 824 GpeNumber)); 825 } 826 break; 827 828 default: 829 /* 830 * No handler or method to run! 831 * 03/2010: This case should no longer be possible. We will not allow 832 * a GPE to be enabled if it has no handler or method. 833 */ 834 ACPI_ERROR ((AE_INFO, 835 "No handler or method for GPE %02X, disabling event", 836 GpeNumber)); 837 break; 838 } 839 840 return_UINT32 (ACPI_INTERRUPT_HANDLED); 841 } 842 843 #endif /* !ACPI_REDUCED_HARDWARE */ 844