1 /****************************************************************************** 2 * 3 * Module Name: evgpeinit - System GPE initialization and update 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 117 #include "acpi.h" 118 #include "accommon.h" 119 #include "acevents.h" 120 #include "acnamesp.h" 121 #include "acinterp.h" 122 123 #define _COMPONENT ACPI_EVENTS 124 ACPI_MODULE_NAME ("evgpeinit") 125 126 127 /******************************************************************************* 128 * 129 * FUNCTION: AcpiEvGpeInitialize 130 * 131 * PARAMETERS: None 132 * 133 * RETURN: Status 134 * 135 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks 136 * 137 ******************************************************************************/ 138 139 ACPI_STATUS 140 AcpiEvGpeInitialize ( 141 void) 142 { 143 UINT32 RegisterCount0 = 0; 144 UINT32 RegisterCount1 = 0; 145 UINT32 GpeNumberMax = 0; 146 ACPI_STATUS Status; 147 148 149 ACPI_FUNCTION_TRACE (EvGpeInitialize); 150 151 152 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 153 if (ACPI_FAILURE (Status)) 154 { 155 return_ACPI_STATUS (Status); 156 } 157 158 /* 159 * Initialize the GPE Block(s) defined in the FADT 160 * 161 * Why the GPE register block lengths are divided by 2: From the ACPI 162 * Spec, section "General-Purpose Event Registers", we have: 163 * 164 * "Each register block contains two registers of equal length 165 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the 166 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN 167 * The length of the GPE1_STS and GPE1_EN registers is equal to 168 * half the GPE1_LEN. If a generic register block is not supported 169 * then its respective block pointer and block length values in the 170 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need 171 * to be the same size." 172 */ 173 174 /* 175 * Determine the maximum GPE number for this machine. 176 * 177 * Note: both GPE0 and GPE1 are optional, and either can exist without 178 * the other. 179 * 180 * If EITHER the register length OR the block address are zero, then that 181 * particular block is not supported. 182 */ 183 if (AcpiGbl_FADT.Gpe0BlockLength && 184 AcpiGbl_FADT.XGpe0Block.Address) 185 { 186 /* GPE block 0 exists (has both length and address > 0) */ 187 188 RegisterCount0 = (UINT16) (AcpiGbl_FADT.Gpe0BlockLength / 2); 189 190 GpeNumberMax = (RegisterCount0 * ACPI_GPE_REGISTER_WIDTH) - 1; 191 192 /* Install GPE Block 0 */ 193 194 Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice, 195 &AcpiGbl_FADT.XGpe0Block, RegisterCount0, 0, 196 AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[0]); 197 198 if (ACPI_FAILURE (Status)) 199 { 200 ACPI_EXCEPTION ((AE_INFO, Status, 201 "Could not create GPE Block 0")); 202 } 203 } 204 205 if (AcpiGbl_FADT.Gpe1BlockLength && 206 AcpiGbl_FADT.XGpe1Block.Address) 207 { 208 /* GPE block 1 exists (has both length and address > 0) */ 209 210 RegisterCount1 = (UINT16) (AcpiGbl_FADT.Gpe1BlockLength / 2); 211 212 /* Check for GPE0/GPE1 overlap (if both banks exist) */ 213 214 if ((RegisterCount0) && 215 (GpeNumberMax >= AcpiGbl_FADT.Gpe1Base)) 216 { 217 ACPI_ERROR ((AE_INFO, 218 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block " 219 "(GPE %u to %u) - Ignoring GPE1", 220 GpeNumberMax, AcpiGbl_FADT.Gpe1Base, 221 AcpiGbl_FADT.Gpe1Base + 222 ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1))); 223 224 /* Ignore GPE1 block by setting the register count to zero */ 225 226 RegisterCount1 = 0; 227 } 228 else 229 { 230 /* Install GPE Block 1 */ 231 232 Status = AcpiEvCreateGpeBlock (AcpiGbl_FadtGpeDevice, 233 &AcpiGbl_FADT.XGpe1Block, RegisterCount1, 234 AcpiGbl_FADT.Gpe1Base, 235 AcpiGbl_FADT.SciInterrupt, &AcpiGbl_GpeFadtBlocks[1]); 236 237 if (ACPI_FAILURE (Status)) 238 { 239 ACPI_EXCEPTION ((AE_INFO, Status, 240 "Could not create GPE Block 1")); 241 } 242 243 /* 244 * GPE0 and GPE1 do not have to be contiguous in the GPE number 245 * space. However, GPE0 always starts at GPE number zero. 246 */ 247 GpeNumberMax = AcpiGbl_FADT.Gpe1Base + 248 ((RegisterCount1 * ACPI_GPE_REGISTER_WIDTH) - 1); 249 } 250 } 251 252 /* Exit if there are no GPE registers */ 253 254 if ((RegisterCount0 + RegisterCount1) == 0) 255 { 256 /* GPEs are not required by ACPI, this is OK */ 257 258 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, 259 "There are no GPE blocks defined in the FADT\n")); 260 Status = AE_OK; 261 goto Cleanup; 262 } 263 264 /* Check for Max GPE number out-of-range */ 265 266 if (GpeNumberMax > ACPI_GPE_MAX) 267 { 268 ACPI_ERROR ((AE_INFO, 269 "Maximum GPE number from FADT is too large: 0x%X", 270 GpeNumberMax)); 271 Status = AE_BAD_VALUE; 272 goto Cleanup; 273 } 274 275 Cleanup: 276 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 277 return_ACPI_STATUS (AE_OK); 278 } 279 280 281 /******************************************************************************* 282 * 283 * FUNCTION: AcpiEvUpdateGpes 284 * 285 * PARAMETERS: TableOwnerId - ID of the newly-loaded ACPI table 286 * 287 * RETURN: None 288 * 289 * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a 290 * result of a Load() or LoadTable() operation. If new GPE 291 * methods have been installed, register the new methods and 292 * enable and runtime GPEs that are associated with them. Also, 293 * run any newly loaded _PRW methods in order to discover any 294 * new CAN_WAKE GPEs. 295 * 296 ******************************************************************************/ 297 298 void 299 AcpiEvUpdateGpes ( 300 ACPI_OWNER_ID TableOwnerId) 301 { 302 ACPI_GPE_XRUPT_INFO *GpeXruptInfo; 303 ACPI_GPE_BLOCK_INFO *GpeBlock; 304 ACPI_GPE_WALK_INFO WalkInfo; 305 ACPI_STATUS Status = AE_OK; 306 UINT32 NewWakeGpeCount = 0; 307 308 309 /* We will examine only _PRW/_Lxx/_Exx methods owned by this table */ 310 311 WalkInfo.OwnerId = TableOwnerId; 312 WalkInfo.ExecuteByOwnerId = TRUE; 313 WalkInfo.Count = 0; 314 315 if (AcpiGbl_LeaveWakeGpesDisabled) 316 { 317 /* 318 * 1) Run any newly-loaded _PRW methods to find any GPEs that 319 * can now be marked as CAN_WAKE GPEs. Note: We must run the 320 * _PRW methods before we process the _Lxx/_Exx methods because 321 * we will enable all runtime GPEs associated with the new 322 * _Lxx/_Exx methods at the time we process those methods. 323 * 324 * Unlock interpreter so that we can run the _PRW methods. 325 */ 326 WalkInfo.GpeBlock = NULL; 327 WalkInfo.GpeDevice = NULL; 328 329 AcpiExExitInterpreter (); 330 331 Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 332 ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK, 333 AcpiEvMatchPrwAndGpe, NULL, &WalkInfo, NULL); 334 if (ACPI_FAILURE (Status)) 335 { 336 ACPI_EXCEPTION ((AE_INFO, Status, 337 "While executing _PRW methods")); 338 } 339 340 AcpiExEnterInterpreter (); 341 NewWakeGpeCount = WalkInfo.Count; 342 } 343 344 /* 345 * 2) Find any _Lxx/_Exx GPE methods that have just been loaded. 346 * 347 * Any GPEs that correspond to new _Lxx/_Exx methods and are not 348 * marked as CAN_WAKE are immediately enabled. 349 * 350 * Examine the namespace underneath each GpeDevice within the 351 * GpeBlock lists. 352 */ 353 Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); 354 if (ACPI_FAILURE (Status)) 355 { 356 return; 357 } 358 359 WalkInfo.Count = 0; 360 WalkInfo.EnableThisGpe = TRUE; 361 362 /* Walk the interrupt level descriptor list */ 363 364 GpeXruptInfo = AcpiGbl_GpeXruptListHead; 365 while (GpeXruptInfo) 366 { 367 /* Walk all Gpe Blocks attached to this interrupt level */ 368 369 GpeBlock = GpeXruptInfo->GpeBlockListHead; 370 while (GpeBlock) 371 { 372 WalkInfo.GpeBlock = GpeBlock; 373 WalkInfo.GpeDevice = GpeBlock->Node; 374 375 Status = AcpiNsWalkNamespace (ACPI_TYPE_METHOD, 376 WalkInfo.GpeDevice, ACPI_UINT32_MAX, 377 ACPI_NS_WALK_NO_UNLOCK, AcpiEvMatchGpeMethod, 378 NULL, &WalkInfo, NULL); 379 if (ACPI_FAILURE (Status)) 380 { 381 ACPI_EXCEPTION ((AE_INFO, Status, 382 "While decoding _Lxx/_Exx methods")); 383 } 384 385 GpeBlock = GpeBlock->Next; 386 } 387 388 GpeXruptInfo = GpeXruptInfo->Next; 389 } 390 391 if (WalkInfo.Count || NewWakeGpeCount) 392 { 393 ACPI_INFO ((AE_INFO, 394 "Enabled %u new runtime GPEs, added %u new wakeup GPEs", 395 WalkInfo.Count, NewWakeGpeCount)); 396 } 397 398 (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS); 399 return; 400 } 401 402 403 /******************************************************************************* 404 * 405 * FUNCTION: AcpiEvMatchGpeMethod 406 * 407 * PARAMETERS: Callback from WalkNamespace 408 * 409 * RETURN: Status 410 * 411 * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a 412 * control method under the _GPE portion of the namespace. 413 * Extract the name and GPE type from the object, saving this 414 * information for quick lookup during GPE dispatch. Allows a 415 * per-OwnerId evaluation if ExecuteByOwnerId is TRUE in the 416 * WalkInfo parameter block. 417 * 418 * The name of each GPE control method is of the form: 419 * "_Lxx" or "_Exx", where: 420 * L - means that the GPE is level triggered 421 * E - means that the GPE is edge triggered 422 * xx - is the GPE number [in HEX] 423 * 424 * If WalkInfo->ExecuteByOwnerId is TRUE, we only execute examine GPE methods 425 * with that owner. 426 * If WalkInfo->EnableThisGpe is TRUE, the GPE that is referred to by a GPE 427 * method is immediately enabled (Used for Load/LoadTable operators) 428 * 429 ******************************************************************************/ 430 431 ACPI_STATUS 432 AcpiEvMatchGpeMethod ( 433 ACPI_HANDLE ObjHandle, 434 UINT32 Level, 435 void *Context, 436 void **ReturnValue) 437 { 438 ACPI_NAMESPACE_NODE *MethodNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle); 439 ACPI_GPE_WALK_INFO *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context); 440 ACPI_GPE_EVENT_INFO *GpeEventInfo; 441 ACPI_NAMESPACE_NODE *GpeDevice; 442 ACPI_STATUS Status; 443 UINT32 GpeNumber; 444 char Name[ACPI_NAME_SIZE + 1]; 445 UINT8 Type; 446 447 448 ACPI_FUNCTION_TRACE (EvMatchGpeMethod); 449 450 451 /* Check if requested OwnerId matches this OwnerId */ 452 453 if ((WalkInfo->ExecuteByOwnerId) && 454 (MethodNode->OwnerId != WalkInfo->OwnerId)) 455 { 456 return_ACPI_STATUS (AE_OK); 457 } 458 459 /* 460 * Match and decode the _Lxx and _Exx GPE method names 461 * 462 * 1) Extract the method name and null terminate it 463 */ 464 ACPI_MOVE_32_TO_32 (Name, &MethodNode->Name.Integer); 465 Name[ACPI_NAME_SIZE] = 0; 466 467 /* 2) Name must begin with an underscore */ 468 469 if (Name[0] != '_') 470 { 471 return_ACPI_STATUS (AE_OK); /* Ignore this method */ 472 } 473 474 /* 475 * 3) Edge/Level determination is based on the 2nd character 476 * of the method name 477 * 478 * NOTE: Default GPE type is RUNTIME only. Later, if a _PRW object is 479 * found that points to this GPE, the ACPI_GPE_CAN_WAKE flag is set. 480 */ 481 switch (Name[1]) 482 { 483 case 'L': 484 Type = ACPI_GPE_LEVEL_TRIGGERED; 485 break; 486 487 case 'E': 488 Type = ACPI_GPE_EDGE_TRIGGERED; 489 break; 490 491 default: 492 /* Unknown method type, just ignore it */ 493 494 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, 495 "Ignoring unknown GPE method type: %s " 496 "(name not of form _Lxx or _Exx)", Name)); 497 return_ACPI_STATUS (AE_OK); 498 } 499 500 /* 4) The last two characters of the name are the hex GPE Number */ 501 502 GpeNumber = ACPI_STRTOUL (&Name[2], NULL, 16); 503 if (GpeNumber == ACPI_UINT32_MAX) 504 { 505 /* Conversion failed; invalid method, just ignore it */ 506 507 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, 508 "Could not extract GPE number from name: %s " 509 "(name is not of form _Lxx or _Exx)", Name)); 510 return_ACPI_STATUS (AE_OK); 511 } 512 513 /* Ensure that we have a valid GPE number for this GPE block */ 514 515 GpeEventInfo = AcpiEvLowGetGpeInfo (GpeNumber, WalkInfo->GpeBlock); 516 if (!GpeEventInfo) 517 { 518 /* 519 * This GpeNumber is not valid for this GPE block, just ignore it. 520 * However, it may be valid for a different GPE block, since GPE0 521 * and GPE1 methods both appear under \_GPE. 522 */ 523 return_ACPI_STATUS (AE_OK); 524 } 525 526 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == 527 ACPI_GPE_DISPATCH_HANDLER) 528 { 529 /* If there is already a handler, ignore this GPE method */ 530 531 return_ACPI_STATUS (AE_OK); 532 } 533 534 if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == 535 ACPI_GPE_DISPATCH_METHOD) 536 { 537 /* 538 * If there is already a method, ignore this method. But check 539 * for a type mismatch (if both the _Lxx AND _Exx exist) 540 */ 541 if (Type != (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK)) 542 { 543 ACPI_ERROR ((AE_INFO, 544 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods", 545 GpeNumber, GpeNumber, GpeNumber)); 546 } 547 return_ACPI_STATUS (AE_OK); 548 } 549 550 /* 551 * Add the GPE information from above to the GpeEventInfo block for 552 * use during dispatch of this GPE. 553 */ 554 GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_METHOD); 555 GpeEventInfo->Dispatch.MethodNode = MethodNode; 556 557 /* 558 * Enable this GPE if requested. This only happens when during the 559 * execution of a Load or LoadTable operator. We have found a new 560 * GPE method and want to immediately enable the GPE if it is a 561 * runtime GPE. 562 */ 563 if (WalkInfo->EnableThisGpe) 564 { 565 /* Ignore GPEs that can wake the system */ 566 567 if (!(GpeEventInfo->Flags & ACPI_GPE_CAN_WAKE) || 568 !AcpiGbl_LeaveWakeGpesDisabled) 569 { 570 WalkInfo->Count++; 571 GpeDevice = WalkInfo->GpeDevice; 572 573 if (GpeDevice == AcpiGbl_FadtGpeDevice) 574 { 575 GpeDevice = NULL; 576 } 577 578 Status = AcpiEnableGpe (GpeDevice, GpeNumber); 579 if (ACPI_FAILURE (Status)) 580 { 581 ACPI_EXCEPTION ((AE_INFO, Status, 582 "Could not enable GPE 0x%02X", GpeNumber)); 583 } 584 } 585 } 586 587 ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, 588 "Registered GPE method %s as GPE number 0x%.2X\n", 589 Name, GpeNumber)); 590 return_ACPI_STATUS (AE_OK); 591 } 592 593 594 /******************************************************************************* 595 * 596 * FUNCTION: AcpiEvMatchPrwAndGpe 597 * 598 * PARAMETERS: Callback from WalkNamespace 599 * 600 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is 601 * not aborted on a single _PRW failure. 602 * 603 * DESCRIPTION: Called from AcpiWalkNamespace. Expects each object to be a 604 * Device. Run the _PRW method. If present, extract the GPE 605 * number and mark the GPE as a CAN_WAKE GPE. Allows a 606 * per-OwnerId execution if ExecuteByOwnerId is TRUE in the 607 * WalkInfo parameter block. 608 * 609 * If WalkInfo->ExecuteByOwnerId is TRUE, we only execute _PRWs with that 610 * owner. 611 * If WalkInfo->GpeDevice is NULL, we execute every _PRW found. Otherwise, 612 * we only execute _PRWs that refer to the input GpeDevice. 613 * 614 ******************************************************************************/ 615 616 ACPI_STATUS 617 AcpiEvMatchPrwAndGpe ( 618 ACPI_HANDLE ObjHandle, 619 UINT32 Level, 620 void *Context, 621 void **ReturnValue) 622 { 623 ACPI_GPE_WALK_INFO *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context); 624 ACPI_NAMESPACE_NODE *GpeDevice; 625 ACPI_GPE_BLOCK_INFO *GpeBlock; 626 ACPI_NAMESPACE_NODE *TargetGpeDevice; 627 ACPI_NAMESPACE_NODE *PrwNode; 628 ACPI_GPE_EVENT_INFO *GpeEventInfo; 629 ACPI_OPERAND_OBJECT *PkgDesc; 630 ACPI_OPERAND_OBJECT *ObjDesc; 631 UINT32 GpeNumber; 632 ACPI_STATUS Status; 633 634 635 ACPI_FUNCTION_TRACE (EvMatchPrwAndGpe); 636 637 638 /* Check for a _PRW method under this device */ 639 640 Status = AcpiNsGetNode (ObjHandle, METHOD_NAME__PRW, 641 ACPI_NS_NO_UPSEARCH, &PrwNode); 642 if (ACPI_FAILURE (Status)) 643 { 644 return_ACPI_STATUS (AE_OK); 645 } 646 647 /* Check if requested OwnerId matches this OwnerId */ 648 649 if ((WalkInfo->ExecuteByOwnerId) && 650 (PrwNode->OwnerId != WalkInfo->OwnerId)) 651 { 652 return_ACPI_STATUS (AE_OK); 653 } 654 655 /* Execute the _PRW */ 656 657 Status = AcpiUtEvaluateObject (PrwNode, NULL, 658 ACPI_BTYPE_PACKAGE, &PkgDesc); 659 if (ACPI_FAILURE (Status)) 660 { 661 return_ACPI_STATUS (AE_OK); 662 } 663 664 /* The returned _PRW package must have at least two elements */ 665 666 if (PkgDesc->Package.Count < 2) 667 { 668 goto Cleanup; 669 } 670 671 /* Extract pointers from the input context */ 672 673 GpeDevice = WalkInfo->GpeDevice; 674 GpeBlock = WalkInfo->GpeBlock; 675 676 /* 677 * The _PRW object must return a package, we are only interested 678 * in the first element 679 */ 680 ObjDesc = PkgDesc->Package.Elements[0]; 681 682 if (ObjDesc->Common.Type == ACPI_TYPE_INTEGER) 683 { 684 /* Use FADT-defined GPE device (from definition of _PRW) */ 685 686 TargetGpeDevice = NULL; 687 if (GpeDevice) 688 { 689 TargetGpeDevice = AcpiGbl_FadtGpeDevice; 690 } 691 692 /* Integer is the GPE number in the FADT described GPE blocks */ 693 694 GpeNumber = (UINT32) ObjDesc->Integer.Value; 695 } 696 else if (ObjDesc->Common.Type == ACPI_TYPE_PACKAGE) 697 { 698 /* Package contains a GPE reference and GPE number within a GPE block */ 699 700 if ((ObjDesc->Package.Count < 2) || 701 ((ObjDesc->Package.Elements[0])->Common.Type != 702 ACPI_TYPE_LOCAL_REFERENCE) || 703 ((ObjDesc->Package.Elements[1])->Common.Type != 704 ACPI_TYPE_INTEGER)) 705 { 706 goto Cleanup; 707 } 708 709 /* Get GPE block reference and decode */ 710 711 TargetGpeDevice = ObjDesc->Package.Elements[0]->Reference.Node; 712 GpeNumber = (UINT32) ObjDesc->Package.Elements[1]->Integer.Value; 713 } 714 else 715 { 716 /* Unknown type, just ignore it */ 717 718 goto Cleanup; 719 } 720 721 /* Get the GpeEventInfo for this GPE */ 722 723 if (GpeDevice) 724 { 725 /* 726 * Is this GPE within this block? 727 * 728 * TRUE if and only if these conditions are true: 729 * 1) The GPE devices match. 730 * 2) The GPE index(number) is within the range of the Gpe Block 731 * associated with the GPE device. 732 */ 733 if (GpeDevice != TargetGpeDevice) 734 { 735 goto Cleanup; 736 } 737 738 GpeEventInfo = AcpiEvLowGetGpeInfo (GpeNumber, GpeBlock); 739 } 740 else 741 { 742 /* GpeDevice is NULL, just match the TargetDevice and GpeNumber */ 743 744 GpeEventInfo = AcpiEvGetGpeEventInfo (TargetGpeDevice, GpeNumber); 745 } 746 747 if (GpeEventInfo) 748 { 749 if (!(GpeEventInfo->Flags & ACPI_GPE_CAN_WAKE)) 750 { 751 /* This GPE can wake the system */ 752 753 GpeEventInfo->Flags |= ACPI_GPE_CAN_WAKE; 754 WalkInfo->Count++; 755 } 756 } 757 758 Cleanup: 759 AcpiUtRemoveReference (PkgDesc); 760 return_ACPI_STATUS (AE_OK); 761 } 762 763