1 /******************************************************************************
3 * Module Name: dsmethod - Parser/Interpreter interface - control method parsing
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
12 * All rights reserved.
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
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
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;
37 * The above copyright and patent license is granted only if the following
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.
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
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
72 * 3.4. Intel retains all right, title, and interest in and to the Original
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.
80 * 4. Disclaimer and Export Compliance
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
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
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.
114 *****************************************************************************/
117 #include "accommon.h"
118 #include "acdispat.h"
119 #include "acinterp.h"
120 #include "acnamesp.h"
121 #include "acdisasm.h"
122 #include "acparser.h"
126 #define _COMPONENT ACPI_DISPATCHER
127 ACPI_MODULE_NAME ("dsmethod")
129 /* Local prototypes */
132 AcpiDsDetectNamedOpcodes (
133 ACPI_WALK_STATE *WalkState,
134 ACPI_PARSE_OBJECT **OutOp);
137 AcpiDsCreateMethodMutex (
138 ACPI_OPERAND_OBJECT *MethodDesc);
141 /*******************************************************************************
143 * FUNCTION: AcpiDsAutoSerializeMethod
145 * PARAMETERS: Node - Namespace Node of the method
146 * ObjDesc - Method object attached to node
150 * DESCRIPTION: Parse a control method AML to scan for control methods that
151 * need serialization due to the creation of named objects.
153 * NOTE: It is a bit of overkill to mark all such methods serialized, since
154 * there is only a problem if the method actually blocks during execution.
155 * A blocking operation is, for example, a Sleep() operation, or any access
156 * to an operation region. However, it is probably not possible to easily
157 * detect whether a method will block or not, so we simply mark all suspicious
158 * methods as serialized.
160 * NOTE2: This code is essentially a generic routine for parsing a single
163 ******************************************************************************/
166 AcpiDsAutoSerializeMethod (
167 ACPI_NAMESPACE_NODE *Node,
168 ACPI_OPERAND_OBJECT *ObjDesc)
171 ACPI_PARSE_OBJECT *Op = NULL;
172 ACPI_WALK_STATE *WalkState;
175 ACPI_FUNCTION_TRACE_PTR (DsAutoSerializeMethod, Node);
178 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
179 "Method auto-serialization parse [%4.4s] %p\n",
180 AcpiUtGetNodeName (Node), Node));
182 /* Create/Init a root op for the method parse tree */
184 Op = AcpiPsAllocOp (AML_METHOD_OP);
187 return_ACPI_STATUS (AE_NO_MEMORY);
190 AcpiPsSetName (Op, Node->Name.Integer);
191 Op->Common.Node = Node;
193 /* Create and initialize a new walk state */
195 WalkState = AcpiDsCreateWalkState (Node->OwnerId, NULL, NULL, NULL);
199 return_ACPI_STATUS (AE_NO_MEMORY);
202 Status = AcpiDsInitAmlWalk (WalkState, Op, Node, ObjDesc->Method.AmlStart,
203 ObjDesc->Method.AmlLength, NULL, 0);
204 if (ACPI_FAILURE (Status))
206 AcpiDsDeleteWalkState (WalkState);
208 return_ACPI_STATUS (Status);
211 WalkState->DescendingCallback = AcpiDsDetectNamedOpcodes;
213 /* Parse the method, scan for creation of named objects */
215 Status = AcpiPsParseAml (WalkState);
217 AcpiPsDeleteParseTree (Op);
218 return_ACPI_STATUS (Status);
222 /*******************************************************************************
224 * FUNCTION: AcpiDsDetectNamedOpcodes
226 * PARAMETERS: WalkState - Current state of the parse tree walk
227 * OutOp - Unused, required for parser interface
231 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
232 * Currently used to detect methods that must be marked serialized
233 * in order to avoid problems with the creation of named objects.
235 ******************************************************************************/
238 AcpiDsDetectNamedOpcodes (
239 ACPI_WALK_STATE *WalkState,
240 ACPI_PARSE_OBJECT **OutOp)
243 ACPI_FUNCTION_NAME (AcpiDsDetectNamedOpcodes);
246 /* We are only interested in opcodes that create a new name */
248 if (!(WalkState->OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_FIELD)))
254 * At this point, we know we have a Named object opcode.
255 * Mark the method as serialized. Later code will create a mutex for
256 * this method to enforce serialization.
258 * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the
259 * Sync Level mechanism for this method, even though it is now serialized.
260 * Otherwise, there can be conflicts with existing ASL code that actually
263 WalkState->MethodDesc->Method.SyncLevel = 0;
264 WalkState->MethodDesc->Method.InfoFlags |=
265 (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL);
267 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
268 "Method serialized [%4.4s] %p - [%s] (%4.4X)\n",
269 WalkState->MethodNode->Name.Ascii, WalkState->MethodNode,
270 WalkState->OpInfo->Name, WalkState->Opcode));
272 /* Abort the parse, no need to examine this method any further */
274 return (AE_CTRL_TERMINATE);
278 /*******************************************************************************
280 * FUNCTION: AcpiDsMethodError
282 * PARAMETERS: Status - Execution status
283 * WalkState - Current state
287 * DESCRIPTION: Called on method error. Invoke the global exception handler if
288 * present, dump the method data if the disassembler is configured
290 * Note: Allows the exception handler to change the status code
292 ******************************************************************************/
297 ACPI_WALK_STATE *WalkState)
299 ACPI_FUNCTION_ENTRY ();
302 /* Ignore AE_OK and control exception codes */
304 if (ACPI_SUCCESS (Status) ||
305 (Status & AE_CODE_CONTROL))
310 /* Invoke the global exception handler */
312 if (AcpiGbl_ExceptionHandler)
314 /* Exit the interpreter, allow handler to execute methods */
316 AcpiExExitInterpreter ();
319 * Handler can map the exception code to anything it wants, including
320 * AE_OK, in which case the executing method will not be aborted.
322 Status = AcpiGbl_ExceptionHandler (Status,
323 WalkState->MethodNode ?
324 WalkState->MethodNode->Name.Integer : 0,
325 WalkState->Opcode, WalkState->AmlOffset, NULL);
326 AcpiExEnterInterpreter ();
329 AcpiDsClearImplicitReturn (WalkState);
331 #ifdef ACPI_DISASSEMBLER
332 if (ACPI_FAILURE (Status))
334 /* Display method locals/args if disassembler is present */
336 AcpiDmDumpMethodInfo (Status, WalkState, WalkState->Op);
344 /*******************************************************************************
346 * FUNCTION: AcpiDsCreateMethodMutex
348 * PARAMETERS: ObjDesc - The method object
352 * DESCRIPTION: Create a mutex object for a serialized control method
354 ******************************************************************************/
357 AcpiDsCreateMethodMutex (
358 ACPI_OPERAND_OBJECT *MethodDesc)
360 ACPI_OPERAND_OBJECT *MutexDesc;
364 ACPI_FUNCTION_TRACE (DsCreateMethodMutex);
367 /* Create the new mutex object */
369 MutexDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX);
372 return_ACPI_STATUS (AE_NO_MEMORY);
375 /* Create the actual OS Mutex */
377 Status = AcpiOsCreateMutex (&MutexDesc->Mutex.OsMutex);
378 if (ACPI_FAILURE (Status))
380 AcpiUtDeleteObjectDesc (MutexDesc);
381 return_ACPI_STATUS (Status);
384 MutexDesc->Mutex.SyncLevel = MethodDesc->Method.SyncLevel;
385 MethodDesc->Method.Mutex = MutexDesc;
386 return_ACPI_STATUS (AE_OK);
390 /*******************************************************************************
392 * FUNCTION: AcpiDsBeginMethodExecution
394 * PARAMETERS: MethodNode - Node of the method
395 * ObjDesc - The method object
396 * WalkState - current state, NULL if not yet executing
401 * DESCRIPTION: Prepare a method for execution. Parses the method if necessary,
402 * increments the thread count, and waits at the method semaphore
403 * for clearance to execute.
405 ******************************************************************************/
408 AcpiDsBeginMethodExecution (
409 ACPI_NAMESPACE_NODE *MethodNode,
410 ACPI_OPERAND_OBJECT *ObjDesc,
411 ACPI_WALK_STATE *WalkState)
413 ACPI_STATUS Status = AE_OK;
416 ACPI_FUNCTION_TRACE_PTR (DsBeginMethodExecution, MethodNode);
421 return_ACPI_STATUS (AE_NULL_ENTRY);
424 /* Prevent wraparound of thread count */
426 if (ObjDesc->Method.ThreadCount == ACPI_UINT8_MAX)
428 ACPI_ERROR ((AE_INFO,
429 "Method reached maximum reentrancy limit (255)"));
430 return_ACPI_STATUS (AE_AML_METHOD_LIMIT);
434 * If this method is serialized, we need to acquire the method mutex.
436 if (ObjDesc->Method.InfoFlags & ACPI_METHOD_SERIALIZED)
439 * Create a mutex for the method if it is defined to be Serialized
440 * and a mutex has not already been created. We defer the mutex creation
441 * until a method is actually executed, to minimize the object count
443 if (!ObjDesc->Method.Mutex)
445 Status = AcpiDsCreateMethodMutex (ObjDesc);
446 if (ACPI_FAILURE (Status))
448 return_ACPI_STATUS (Status);
453 * The CurrentSyncLevel (per-thread) must be less than or equal to
454 * the sync level of the method. This mechanism provides some
455 * deadlock prevention.
457 * If the method was auto-serialized, we just ignore the sync level
458 * mechanism, because auto-serialization of methods can interfere
459 * with ASL code that actually uses sync levels.
461 * Top-level method invocation has no walk state at this point
464 (!(ObjDesc->Method.InfoFlags & ACPI_METHOD_IGNORE_SYNC_LEVEL)) &&
465 (WalkState->Thread->CurrentSyncLevel > ObjDesc->Method.Mutex->Mutex.SyncLevel))
467 ACPI_ERROR ((AE_INFO,
468 "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%u)",
469 AcpiUtGetNodeName (MethodNode),
470 WalkState->Thread->CurrentSyncLevel));
472 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
476 * Obtain the method mutex if necessary. Do not acquire mutex for a
480 !ObjDesc->Method.Mutex->Mutex.ThreadId ||
481 (WalkState->Thread->ThreadId != ObjDesc->Method.Mutex->Mutex.ThreadId))
484 * Acquire the method mutex. This releases the interpreter if we
485 * block (and reacquires it before it returns)
487 Status = AcpiExSystemWaitMutex (ObjDesc->Method.Mutex->Mutex.OsMutex,
489 if (ACPI_FAILURE (Status))
491 return_ACPI_STATUS (Status);
494 /* Update the mutex and walk info and save the original SyncLevel */
498 ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel =
499 WalkState->Thread->CurrentSyncLevel;
501 ObjDesc->Method.Mutex->Mutex.ThreadId = WalkState->Thread->ThreadId;
502 WalkState->Thread->CurrentSyncLevel = ObjDesc->Method.SyncLevel;
506 ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel =
507 ObjDesc->Method.Mutex->Mutex.SyncLevel;
511 /* Always increase acquisition depth */
513 ObjDesc->Method.Mutex->Mutex.AcquisitionDepth++;
517 * Allocate an Owner ID for this method, only if this is the first thread
518 * to begin concurrent execution. We only need one OwnerId, even if the
519 * method is invoked recursively.
521 if (!ObjDesc->Method.OwnerId)
523 Status = AcpiUtAllocateOwnerId (&ObjDesc->Method.OwnerId);
524 if (ACPI_FAILURE (Status))
531 * Increment the method parse tree thread count since it has been
532 * reentered one more time (even if it is the same thread)
534 ObjDesc->Method.ThreadCount++;
536 return_ACPI_STATUS (Status);
540 /* On error, must release the method mutex (if present) */
542 if (ObjDesc->Method.Mutex)
544 AcpiOsReleaseMutex (ObjDesc->Method.Mutex->Mutex.OsMutex);
546 return_ACPI_STATUS (Status);
550 /*******************************************************************************
552 * FUNCTION: AcpiDsCallControlMethod
554 * PARAMETERS: Thread - Info for this thread
555 * ThisWalkState - Current walk state
556 * Op - Current Op to be walked
560 * DESCRIPTION: Transfer execution to a called control method
562 ******************************************************************************/
565 AcpiDsCallControlMethod (
566 ACPI_THREAD_STATE *Thread,
567 ACPI_WALK_STATE *ThisWalkState,
568 ACPI_PARSE_OBJECT *Op)
571 ACPI_NAMESPACE_NODE *MethodNode;
572 ACPI_WALK_STATE *NextWalkState = NULL;
573 ACPI_OPERAND_OBJECT *ObjDesc;
574 ACPI_EVALUATE_INFO *Info;
578 ACPI_FUNCTION_TRACE_PTR (DsCallControlMethod, ThisWalkState);
580 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Calling method %p, currentstate=%p\n",
581 ThisWalkState->PrevOp, ThisWalkState));
584 * Get the namespace entry for the control method we are about to call
586 MethodNode = ThisWalkState->MethodCallNode;
589 return_ACPI_STATUS (AE_NULL_ENTRY);
592 ObjDesc = AcpiNsGetAttachedObject (MethodNode);
595 return_ACPI_STATUS (AE_NULL_OBJECT);
598 /* Init for new method, possibly wait on method mutex */
600 Status = AcpiDsBeginMethodExecution (MethodNode, ObjDesc,
602 if (ACPI_FAILURE (Status))
604 return_ACPI_STATUS (Status);
607 /* Begin method parse/execution. Create a new walk state */
609 NextWalkState = AcpiDsCreateWalkState (ObjDesc->Method.OwnerId,
610 NULL, ObjDesc, Thread);
613 Status = AE_NO_MEMORY;
618 * The resolved arguments were put on the previous walk state's operand
619 * stack. Operands on the previous walk state stack always
620 * start at index 0. Also, null terminate the list of arguments
622 ThisWalkState->Operands [ThisWalkState->NumOperands] = NULL;
625 * Allocate and initialize the evaluation information block
626 * TBD: this is somewhat inefficient, should change interface to
627 * DsInitAmlWalk. For now, keeps this struct off the CPU stack
629 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
632 Status = AE_NO_MEMORY;
636 Info->Parameters = &ThisWalkState->Operands[0];
638 Status = AcpiDsInitAmlWalk (NextWalkState, NULL, MethodNode,
639 ObjDesc->Method.AmlStart, ObjDesc->Method.AmlLength,
640 Info, ACPI_IMODE_EXECUTE);
643 if (ACPI_FAILURE (Status))
649 * Delete the operands on the previous walkstate operand stack
650 * (they were copied to new objects)
652 for (i = 0; i < ObjDesc->Method.ParamCount; i++)
654 AcpiUtRemoveReference (ThisWalkState->Operands [i]);
655 ThisWalkState->Operands [i] = NULL;
658 /* Clear the operand stack */
660 ThisWalkState->NumOperands = 0;
662 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
663 "**** Begin nested execution of [%4.4s] **** WalkState=%p\n",
664 MethodNode->Name.Ascii, NextWalkState));
666 /* Invoke an internal method if necessary */
668 if (ObjDesc->Method.InfoFlags & ACPI_METHOD_INTERNAL_ONLY)
670 Status = ObjDesc->Method.Dispatch.Implementation (NextWalkState);
673 Status = AE_CTRL_TERMINATE;
677 return_ACPI_STATUS (Status);
682 /* On error, we must terminate the method properly */
684 AcpiDsTerminateControlMethod (ObjDesc, NextWalkState);
687 AcpiDsDeleteWalkState (NextWalkState);
690 return_ACPI_STATUS (Status);
694 /*******************************************************************************
696 * FUNCTION: AcpiDsRestartControlMethod
698 * PARAMETERS: WalkState - State for preempted method (caller)
699 * ReturnDesc - Return value from the called method
703 * DESCRIPTION: Restart a method that was preempted by another (nested) method
704 * invocation. Handle the return value (if any) from the callee.
706 ******************************************************************************/
709 AcpiDsRestartControlMethod (
710 ACPI_WALK_STATE *WalkState,
711 ACPI_OPERAND_OBJECT *ReturnDesc)
714 int SameAsImplicitReturn;
717 ACPI_FUNCTION_TRACE_PTR (DsRestartControlMethod, WalkState);
720 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
721 "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n",
722 AcpiUtGetNodeName (WalkState->MethodNode),
723 WalkState->MethodCallOp, ReturnDesc));
725 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
726 " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n",
727 WalkState->ReturnUsed,
728 WalkState->Results, WalkState));
730 /* Did the called method return a value? */
734 /* Is the implicit return object the same as the return desc? */
736 SameAsImplicitReturn = (WalkState->ImplicitReturnObj == ReturnDesc);
738 /* Are we actually going to use the return value? */
740 if (WalkState->ReturnUsed)
742 /* Save the return value from the previous method */
744 Status = AcpiDsResultPush (ReturnDesc, WalkState);
745 if (ACPI_FAILURE (Status))
747 AcpiUtRemoveReference (ReturnDesc);
748 return_ACPI_STATUS (Status);
752 * Save as THIS method's return value in case it is returned
753 * immediately to yet another method
755 WalkState->ReturnDesc = ReturnDesc;
759 * The following code is the optional support for the so-called
760 * "implicit return". Some AML code assumes that the last value of the
761 * method is "implicitly" returned to the caller, in the absence of an
762 * explicit return value.
764 * Just save the last result of the method as the return value.
766 * NOTE: this is optional because the ASL language does not actually
767 * support this behavior.
769 else if (!AcpiDsDoImplicitReturn (ReturnDesc, WalkState, FALSE) ||
770 SameAsImplicitReturn)
773 * Delete the return value if it will not be used by the
774 * calling method or remove one reference if the explicit return
775 * is the same as the implicit return value.
777 AcpiUtRemoveReference (ReturnDesc);
781 return_ACPI_STATUS (AE_OK);
785 /*******************************************************************************
787 * FUNCTION: AcpiDsTerminateControlMethod
789 * PARAMETERS: MethodDesc - Method object
790 * WalkState - State associated with the method
794 * DESCRIPTION: Terminate a control method. Delete everything that the method
795 * created, delete all locals and arguments, and delete the parse
798 * MUTEX: Interpreter is locked
800 ******************************************************************************/
803 AcpiDsTerminateControlMethod (
804 ACPI_OPERAND_OBJECT *MethodDesc,
805 ACPI_WALK_STATE *WalkState)
808 ACPI_FUNCTION_TRACE_PTR (DsTerminateControlMethod, WalkState);
811 /* MethodDesc is required, WalkState is optional */
820 /* Delete all arguments and locals */
822 AcpiDsMethodDataDeleteAll (WalkState);
825 * If method is serialized, release the mutex and restore the
826 * current sync level for this thread
828 if (MethodDesc->Method.Mutex)
830 /* Acquisition Depth handles recursive calls */
832 MethodDesc->Method.Mutex->Mutex.AcquisitionDepth--;
833 if (!MethodDesc->Method.Mutex->Mutex.AcquisitionDepth)
835 WalkState->Thread->CurrentSyncLevel =
836 MethodDesc->Method.Mutex->Mutex.OriginalSyncLevel;
838 AcpiOsReleaseMutex (MethodDesc->Method.Mutex->Mutex.OsMutex);
839 MethodDesc->Method.Mutex->Mutex.ThreadId = 0;
844 * Delete any namespace objects created anywhere within the
845 * namespace by the execution of this method. Unless:
846 * 1) This method is a module-level executable code method, in which
847 * case we want make the objects permanent.
848 * 2) There are other threads executing the method, in which case we
849 * will wait until the last thread has completed.
851 if (!(MethodDesc->Method.InfoFlags & ACPI_METHOD_MODULE_LEVEL) &&
852 (MethodDesc->Method.ThreadCount == 1))
854 /* Delete any direct children of (created by) this method */
856 AcpiNsDeleteNamespaceSubtree (WalkState->MethodNode);
859 * Delete any objects that were created by this method
860 * elsewhere in the namespace (if any were created).
861 * Use of the ACPI_METHOD_MODIFIED_NAMESPACE optimizes the
862 * deletion such that we don't have to perform an entire
863 * namespace walk for every control method execution.
865 if (MethodDesc->Method.InfoFlags & ACPI_METHOD_MODIFIED_NAMESPACE)
867 AcpiNsDeleteNamespaceByOwner (MethodDesc->Method.OwnerId);
868 MethodDesc->Method.InfoFlags &= ~ACPI_METHOD_MODIFIED_NAMESPACE;
873 /* Decrement the thread count on the method */
875 if (MethodDesc->Method.ThreadCount)
877 MethodDesc->Method.ThreadCount--;
881 ACPI_ERROR ((AE_INFO,
882 "Invalid zero thread count in method"));
885 /* Are there any other threads currently executing this method? */
887 if (MethodDesc->Method.ThreadCount)
890 * Additional threads. Do not release the OwnerId in this case,
891 * we immediately reuse it for the next thread executing this method
893 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
894 "*** Completed execution of one thread, %u threads remaining\n",
895 MethodDesc->Method.ThreadCount));
899 /* This is the only executing thread for this method */
902 * Support to dynamically change a method from NotSerialized to
903 * Serialized if it appears that the method is incorrectly written and
904 * does not support multiple thread execution. The best example of this
905 * is if such a method creates namespace objects and blocks. A second
906 * thread will fail with an AE_ALREADY_EXISTS exception.
908 * This code is here because we must wait until the last thread exits
909 * before marking the method as serialized.
911 if (MethodDesc->Method.InfoFlags & ACPI_METHOD_SERIALIZED_PENDING)
916 "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
917 WalkState->MethodNode->Name.Ascii));
921 * Method tried to create an object twice and was marked as
922 * "pending serialized". The probable cause is that the method
923 * cannot handle reentrancy.
925 * The method was created as NotSerialized, but it tried to create
926 * a named object and then blocked, causing the second thread
927 * entrance to begin and then fail. Workaround this problem by
928 * marking the method permanently as Serialized when the last
931 MethodDesc->Method.InfoFlags &= ~ACPI_METHOD_SERIALIZED_PENDING;
932 MethodDesc->Method.InfoFlags |=
933 (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL);
934 MethodDesc->Method.SyncLevel = 0;
937 /* No more threads, we can free the OwnerId */
939 if (!(MethodDesc->Method.InfoFlags & ACPI_METHOD_MODULE_LEVEL))
941 AcpiUtReleaseOwnerId (&MethodDesc->Method.OwnerId);