1 /****************************************************************************** 2 * 3 * Module Name: exmutex - ASL Mutex Acquire/Release functions 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2021, 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 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include <contrib/dev/acpica/include/acpi.h> 153 #include <contrib/dev/acpica/include/accommon.h> 154 #include <contrib/dev/acpica/include/acinterp.h> 155 #include <contrib/dev/acpica/include/acevents.h> 156 157 #define _COMPONENT ACPI_EXECUTER 158 ACPI_MODULE_NAME ("exmutex") 159 160 /* Local prototypes */ 161 162 static void 163 AcpiExLinkMutex ( 164 ACPI_OPERAND_OBJECT *ObjDesc, 165 ACPI_THREAD_STATE *Thread); 166 167 168 /******************************************************************************* 169 * 170 * FUNCTION: AcpiExUnlinkMutex 171 * 172 * PARAMETERS: ObjDesc - The mutex to be unlinked 173 * 174 * RETURN: None 175 * 176 * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list 177 * 178 ******************************************************************************/ 179 180 void 181 AcpiExUnlinkMutex ( 182 ACPI_OPERAND_OBJECT *ObjDesc) 183 { 184 ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread; 185 186 187 if (!Thread) 188 { 189 return; 190 } 191 192 /* Doubly linked list */ 193 194 if (ObjDesc->Mutex.Next) 195 { 196 (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev; 197 } 198 199 if (ObjDesc->Mutex.Prev) 200 { 201 (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next; 202 203 /* 204 * Migrate the previous sync level associated with this mutex to 205 * the previous mutex on the list so that it may be preserved. 206 * This handles the case where several mutexes have been acquired 207 * at the same level, but are not released in opposite order. 208 */ 209 (ObjDesc->Mutex.Prev)->Mutex.OriginalSyncLevel = 210 ObjDesc->Mutex.OriginalSyncLevel; 211 } 212 else 213 { 214 Thread->AcquiredMutexList = ObjDesc->Mutex.Next; 215 } 216 } 217 218 219 /******************************************************************************* 220 * 221 * FUNCTION: AcpiExLinkMutex 222 * 223 * PARAMETERS: ObjDesc - The mutex to be linked 224 * Thread - Current executing thread object 225 * 226 * RETURN: None 227 * 228 * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk 229 * 230 ******************************************************************************/ 231 232 static void 233 AcpiExLinkMutex ( 234 ACPI_OPERAND_OBJECT *ObjDesc, 235 ACPI_THREAD_STATE *Thread) 236 { 237 ACPI_OPERAND_OBJECT *ListHead; 238 239 240 ListHead = Thread->AcquiredMutexList; 241 242 /* This object will be the first object in the list */ 243 244 ObjDesc->Mutex.Prev = NULL; 245 ObjDesc->Mutex.Next = ListHead; 246 247 /* Update old first object to point back to this object */ 248 249 if (ListHead) 250 { 251 ListHead->Mutex.Prev = ObjDesc; 252 } 253 254 /* Update list head */ 255 256 Thread->AcquiredMutexList = ObjDesc; 257 } 258 259 260 /******************************************************************************* 261 * 262 * FUNCTION: AcpiExAcquireMutexObject 263 * 264 * PARAMETERS: Timeout - Timeout in milliseconds 265 * ObjDesc - Mutex object 266 * ThreadId - Current thread state 267 * 268 * RETURN: Status 269 * 270 * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common 271 * path that supports multiple acquires by the same thread. 272 * 273 * MUTEX: Interpreter must be locked 274 * 275 * NOTE: This interface is called from three places: 276 * 1) From AcpiExAcquireMutex, via an AML Acquire() operator 277 * 2) From AcpiExAcquireGlobalLock when an AML Field access requires the 278 * global lock 279 * 3) From the external interface, AcpiAcquireGlobalLock 280 * 281 ******************************************************************************/ 282 283 ACPI_STATUS 284 AcpiExAcquireMutexObject ( 285 UINT16 Timeout, 286 ACPI_OPERAND_OBJECT *ObjDesc, 287 ACPI_THREAD_ID ThreadId) 288 { 289 ACPI_STATUS Status; 290 291 292 ACPI_FUNCTION_TRACE_PTR (ExAcquireMutexObject, ObjDesc); 293 294 295 if (!ObjDesc) 296 { 297 return_ACPI_STATUS (AE_BAD_PARAMETER); 298 } 299 300 /* Support for multiple acquires by the owning thread */ 301 302 if (ObjDesc->Mutex.ThreadId == ThreadId) 303 { 304 /* 305 * The mutex is already owned by this thread, just increment the 306 * acquisition depth 307 */ 308 ObjDesc->Mutex.AcquisitionDepth++; 309 return_ACPI_STATUS (AE_OK); 310 } 311 312 /* Acquire the mutex, wait if necessary. Special case for Global Lock */ 313 314 if (ObjDesc == AcpiGbl_GlobalLockMutex) 315 { 316 Status = AcpiEvAcquireGlobalLock (Timeout); 317 } 318 else 319 { 320 Status = AcpiExSystemWaitMutex (ObjDesc->Mutex.OsMutex, Timeout); 321 } 322 323 if (ACPI_FAILURE (Status)) 324 { 325 /* Includes failure from a timeout on TimeDesc */ 326 327 return_ACPI_STATUS (Status); 328 } 329 330 /* Acquired the mutex: update mutex object */ 331 332 ObjDesc->Mutex.ThreadId = ThreadId; 333 ObjDesc->Mutex.AcquisitionDepth = 1; 334 ObjDesc->Mutex.OriginalSyncLevel = 0; 335 ObjDesc->Mutex.OwnerThread = NULL; /* Used only for AML Acquire() */ 336 337 return_ACPI_STATUS (AE_OK); 338 } 339 340 341 /******************************************************************************* 342 * 343 * FUNCTION: AcpiExAcquireMutex 344 * 345 * PARAMETERS: TimeDesc - Timeout integer 346 * ObjDesc - Mutex object 347 * WalkState - Current method execution state 348 * 349 * RETURN: Status 350 * 351 * DESCRIPTION: Acquire an AML mutex 352 * 353 ******************************************************************************/ 354 355 ACPI_STATUS 356 AcpiExAcquireMutex ( 357 ACPI_OPERAND_OBJECT *TimeDesc, 358 ACPI_OPERAND_OBJECT *ObjDesc, 359 ACPI_WALK_STATE *WalkState) 360 { 361 ACPI_STATUS Status; 362 363 364 ACPI_FUNCTION_TRACE_PTR (ExAcquireMutex, ObjDesc); 365 366 367 if (!ObjDesc) 368 { 369 return_ACPI_STATUS (AE_BAD_PARAMETER); 370 } 371 372 /* Must have a valid thread state struct */ 373 374 if (!WalkState->Thread) 375 { 376 ACPI_ERROR ((AE_INFO, 377 "Cannot acquire Mutex [%4.4s], null thread info", 378 AcpiUtGetNodeName (ObjDesc->Mutex.Node))); 379 return_ACPI_STATUS (AE_AML_INTERNAL); 380 } 381 382 /* 383 * Current sync level must be less than or equal to the sync level 384 * of the mutex. This mechanism provides some deadlock prevention. 385 */ 386 if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel) 387 { 388 ACPI_ERROR ((AE_INFO, 389 "Cannot acquire Mutex [%4.4s], " 390 "current SyncLevel is too large (%u)", 391 AcpiUtGetNodeName (ObjDesc->Mutex.Node), 392 WalkState->Thread->CurrentSyncLevel)); 393 return_ACPI_STATUS (AE_AML_MUTEX_ORDER); 394 } 395 396 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 397 "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, " 398 "Depth %u TID %p\n", 399 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, 400 ObjDesc->Mutex.AcquisitionDepth, WalkState->Thread)); 401 402 Status = AcpiExAcquireMutexObject ((UINT16) TimeDesc->Integer.Value, 403 ObjDesc, WalkState->Thread->ThreadId); 404 405 if (ACPI_SUCCESS (Status) && ObjDesc->Mutex.AcquisitionDepth == 1) 406 { 407 /* Save Thread object, original/current sync levels */ 408 409 ObjDesc->Mutex.OwnerThread = WalkState->Thread; 410 ObjDesc->Mutex.OriginalSyncLevel = 411 WalkState->Thread->CurrentSyncLevel; 412 WalkState->Thread->CurrentSyncLevel = 413 ObjDesc->Mutex.SyncLevel; 414 415 /* Link the mutex to the current thread for force-unlock at method exit */ 416 417 AcpiExLinkMutex (ObjDesc, WalkState->Thread); 418 } 419 420 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 421 "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n", 422 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, 423 ObjDesc->Mutex.AcquisitionDepth)); 424 425 return_ACPI_STATUS (Status); 426 } 427 428 429 /******************************************************************************* 430 * 431 * FUNCTION: AcpiExReleaseMutexObject 432 * 433 * PARAMETERS: ObjDesc - The object descriptor for this op 434 * 435 * RETURN: Status 436 * 437 * DESCRIPTION: Release a previously acquired Mutex, low level interface. 438 * Provides a common path that supports multiple releases (after 439 * previous multiple acquires) by the same thread. 440 * 441 * MUTEX: Interpreter must be locked 442 * 443 * NOTE: This interface is called from three places: 444 * 1) From AcpiExReleaseMutex, via an AML Acquire() operator 445 * 2) From AcpiExReleaseGlobalLock when an AML Field access requires the 446 * global lock 447 * 3) From the external interface, AcpiReleaseGlobalLock 448 * 449 ******************************************************************************/ 450 451 ACPI_STATUS 452 AcpiExReleaseMutexObject ( 453 ACPI_OPERAND_OBJECT *ObjDesc) 454 { 455 ACPI_STATUS Status = AE_OK; 456 457 458 ACPI_FUNCTION_TRACE (ExReleaseMutexObject); 459 460 461 if (ObjDesc->Mutex.AcquisitionDepth == 0) 462 { 463 return_ACPI_STATUS (AE_NOT_ACQUIRED); 464 } 465 466 /* Match multiple Acquires with multiple Releases */ 467 468 ObjDesc->Mutex.AcquisitionDepth--; 469 if (ObjDesc->Mutex.AcquisitionDepth != 0) 470 { 471 /* Just decrement the depth and return */ 472 473 return_ACPI_STATUS (AE_OK); 474 } 475 476 if (ObjDesc->Mutex.OwnerThread) 477 { 478 /* Unlink the mutex from the owner's list */ 479 480 AcpiExUnlinkMutex (ObjDesc); 481 ObjDesc->Mutex.OwnerThread = NULL; 482 } 483 484 /* Release the mutex, special case for Global Lock */ 485 486 if (ObjDesc == AcpiGbl_GlobalLockMutex) 487 { 488 Status = AcpiEvReleaseGlobalLock (); 489 } 490 else 491 { 492 AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex); 493 } 494 495 /* Clear mutex info */ 496 497 ObjDesc->Mutex.ThreadId = 0; 498 return_ACPI_STATUS (Status); 499 } 500 501 502 /******************************************************************************* 503 * 504 * FUNCTION: AcpiExReleaseMutex 505 * 506 * PARAMETERS: ObjDesc - The object descriptor for this op 507 * WalkState - Current method execution state 508 * 509 * RETURN: Status 510 * 511 * DESCRIPTION: Release a previously acquired Mutex. 512 * 513 ******************************************************************************/ 514 515 ACPI_STATUS 516 AcpiExReleaseMutex ( 517 ACPI_OPERAND_OBJECT *ObjDesc, 518 ACPI_WALK_STATE *WalkState) 519 { 520 UINT8 PreviousSyncLevel; 521 ACPI_THREAD_STATE *OwnerThread; 522 ACPI_STATUS Status = AE_OK; 523 524 525 ACPI_FUNCTION_TRACE (ExReleaseMutex); 526 527 528 if (!ObjDesc) 529 { 530 return_ACPI_STATUS (AE_BAD_PARAMETER); 531 } 532 533 OwnerThread = ObjDesc->Mutex.OwnerThread; 534 535 /* The mutex must have been previously acquired in order to release it */ 536 537 if (!OwnerThread) 538 { 539 ACPI_ERROR ((AE_INFO, 540 "Cannot release Mutex [%4.4s], not acquired", 541 AcpiUtGetNodeName (ObjDesc->Mutex.Node))); 542 return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED); 543 } 544 545 /* Must have a valid thread ID */ 546 547 if (!WalkState->Thread) 548 { 549 ACPI_ERROR ((AE_INFO, 550 "Cannot release Mutex [%4.4s], null thread info", 551 AcpiUtGetNodeName (ObjDesc->Mutex.Node))); 552 return_ACPI_STATUS (AE_AML_INTERNAL); 553 } 554 555 /* 556 * The Mutex is owned, but this thread must be the owner. 557 * Special case for Global Lock, any thread can release 558 */ 559 if ((OwnerThread->ThreadId != WalkState->Thread->ThreadId) && 560 (ObjDesc != AcpiGbl_GlobalLockMutex)) 561 { 562 ACPI_ERROR ((AE_INFO, 563 "Thread %u cannot release Mutex [%4.4s] acquired by thread %u", 564 (UINT32) WalkState->Thread->ThreadId, 565 AcpiUtGetNodeName (ObjDesc->Mutex.Node), 566 (UINT32) OwnerThread->ThreadId)); 567 return_ACPI_STATUS (AE_AML_NOT_OWNER); 568 } 569 570 /* 571 * The sync level of the mutex must be equal to the current sync level. In 572 * other words, the current level means that at least one mutex at that 573 * level is currently being held. Attempting to release a mutex of a 574 * different level can only mean that the mutex ordering rule is being 575 * violated. This behavior is clarified in ACPI 4.0 specification. 576 */ 577 if (ObjDesc->Mutex.SyncLevel != OwnerThread->CurrentSyncLevel) 578 { 579 ACPI_ERROR ((AE_INFO, 580 "Cannot release Mutex [%4.4s], SyncLevel mismatch: " 581 "mutex %u current %u", 582 AcpiUtGetNodeName (ObjDesc->Mutex.Node), 583 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel)); 584 return_ACPI_STATUS (AE_AML_MUTEX_ORDER); 585 } 586 587 /* 588 * Get the previous SyncLevel from the head of the acquired mutex list. 589 * This handles the case where several mutexes at the same level have been 590 * acquired, but are not released in reverse order. 591 */ 592 PreviousSyncLevel = 593 OwnerThread->AcquiredMutexList->Mutex.OriginalSyncLevel; 594 595 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 596 "Releasing: Object SyncLevel %u, Thread SyncLevel %u, " 597 "Prev SyncLevel %u, Depth %u TID %p\n", 598 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, 599 PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth, 600 WalkState->Thread)); 601 602 Status = AcpiExReleaseMutexObject (ObjDesc); 603 if (ACPI_FAILURE (Status)) 604 { 605 return_ACPI_STATUS (Status); 606 } 607 608 if (ObjDesc->Mutex.AcquisitionDepth == 0) 609 { 610 /* Restore the previous SyncLevel */ 611 612 OwnerThread->CurrentSyncLevel = PreviousSyncLevel; 613 } 614 615 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 616 "Released: Object SyncLevel %u, Thread SyncLevel, %u, " 617 "Prev SyncLevel %u, Depth %u\n", 618 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel, 619 PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth)); 620 621 return_ACPI_STATUS (Status); 622 } 623 624 625 /******************************************************************************* 626 * 627 * FUNCTION: AcpiExReleaseAllMutexes 628 * 629 * PARAMETERS: Thread - Current executing thread object 630 * 631 * RETURN: Status 632 * 633 * DESCRIPTION: Release all mutexes held by this thread 634 * 635 * NOTE: This function is called as the thread is exiting the interpreter. 636 * Mutexes are not released when an individual control method is exited, but 637 * only when the parent thread actually exits the interpreter. This allows one 638 * method to acquire a mutex, and a different method to release it, as long as 639 * this is performed underneath a single parent control method. 640 * 641 ******************************************************************************/ 642 643 void 644 AcpiExReleaseAllMutexes ( 645 ACPI_THREAD_STATE *Thread) 646 { 647 ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList; 648 ACPI_OPERAND_OBJECT *ObjDesc; 649 650 651 ACPI_FUNCTION_TRACE (ExReleaseAllMutexes); 652 653 654 /* Traverse the list of owned mutexes, releasing each one */ 655 656 while (Next) 657 { 658 ObjDesc = Next; 659 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 660 "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n", 661 ObjDesc->Mutex.Node->Name.Ascii, ObjDesc->Mutex.SyncLevel, 662 ObjDesc->Mutex.AcquisitionDepth)); 663 664 /* Release the mutex, special case for Global Lock */ 665 666 if (ObjDesc == AcpiGbl_GlobalLockMutex) 667 { 668 /* Ignore errors */ 669 670 (void) AcpiEvReleaseGlobalLock (); 671 } 672 else 673 { 674 AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex); 675 } 676 677 /* Update Thread SyncLevel (Last mutex is the important one) */ 678 679 Thread->CurrentSyncLevel = ObjDesc->Mutex.OriginalSyncLevel; 680 681 /* Mark mutex unowned */ 682 683 Next = ObjDesc->Mutex.Next; 684 685 ObjDesc->Mutex.Prev = NULL; 686 ObjDesc->Mutex.Next = NULL; 687 ObjDesc->Mutex.AcquisitionDepth = 0; 688 ObjDesc->Mutex.OwnerThread = NULL; 689 ObjDesc->Mutex.ThreadId = 0; 690 } 691 692 return_VOID; 693 } 694