diff options
Diffstat (limited to 'usr/src/common/acpica/dispatcher/dsmethod.c')
| -rw-r--r-- | usr/src/common/acpica/dispatcher/dsmethod.c | 910 |
1 files changed, 910 insertions, 0 deletions
diff --git a/usr/src/common/acpica/dispatcher/dsmethod.c b/usr/src/common/acpica/dispatcher/dsmethod.c new file mode 100644 index 0000000000..334dadcac6 --- /dev/null +++ b/usr/src/common/acpica/dispatcher/dsmethod.c @@ -0,0 +1,910 @@ +/****************************************************************************** + * + * Module Name: dsmethod - Parser/Interpreter interface - control method parsing + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2016, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#include "acpi.h" +#include "accommon.h" +#include "acdispat.h" +#include "acinterp.h" +#include "acnamesp.h" +#include "acparser.h" +#include "amlcode.h" +#include "acdebug.h" + + +#define _COMPONENT ACPI_DISPATCHER + ACPI_MODULE_NAME ("dsmethod") + +/* Local prototypes */ + +static ACPI_STATUS +AcpiDsDetectNamedOpcodes ( + ACPI_WALK_STATE *WalkState, + ACPI_PARSE_OBJECT **OutOp); + +static ACPI_STATUS +AcpiDsCreateMethodMutex ( + ACPI_OPERAND_OBJECT *MethodDesc); + + +/******************************************************************************* + * + * FUNCTION: AcpiDsAutoSerializeMethod + * + * PARAMETERS: Node - Namespace Node of the method + * ObjDesc - Method object attached to node + * + * RETURN: Status + * + * DESCRIPTION: Parse a control method AML to scan for control methods that + * need serialization due to the creation of named objects. + * + * NOTE: It is a bit of overkill to mark all such methods serialized, since + * there is only a problem if the method actually blocks during execution. + * A blocking operation is, for example, a Sleep() operation, or any access + * to an operation region. However, it is probably not possible to easily + * detect whether a method will block or not, so we simply mark all suspicious + * methods as serialized. + * + * NOTE2: This code is essentially a generic routine for parsing a single + * control method. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsAutoSerializeMethod ( + ACPI_NAMESPACE_NODE *Node, + ACPI_OPERAND_OBJECT *ObjDesc) +{ + ACPI_STATUS Status; + ACPI_PARSE_OBJECT *Op = NULL; + ACPI_WALK_STATE *WalkState; + + + ACPI_FUNCTION_TRACE_PTR (DsAutoSerializeMethod, Node); + + + ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, + "Method auto-serialization parse [%4.4s] %p\n", + AcpiUtGetNodeName (Node), Node)); + + /* Create/Init a root op for the method parse tree */ + + Op = AcpiPsAllocOp (AML_METHOD_OP, ObjDesc->Method.AmlStart); + if (!Op) + { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + AcpiPsSetName (Op, Node->Name.Integer); + Op->Common.Node = Node; + + /* Create and initialize a new walk state */ + + WalkState = AcpiDsCreateWalkState (Node->OwnerId, NULL, NULL, NULL); + if (!WalkState) + { + AcpiPsFreeOp (Op); + return_ACPI_STATUS (AE_NO_MEMORY); + } + + Status = AcpiDsInitAmlWalk (WalkState, Op, Node, + ObjDesc->Method.AmlStart, ObjDesc->Method.AmlLength, NULL, 0); + if (ACPI_FAILURE (Status)) + { + AcpiDsDeleteWalkState (WalkState); + AcpiPsFreeOp (Op); + return_ACPI_STATUS (Status); + } + + WalkState->DescendingCallback = AcpiDsDetectNamedOpcodes; + + /* Parse the method, scan for creation of named objects */ + + Status = AcpiPsParseAml (WalkState); + + AcpiPsDeleteParseTree (Op); + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsDetectNamedOpcodes + * + * PARAMETERS: WalkState - Current state of the parse tree walk + * OutOp - Unused, required for parser interface + * + * RETURN: Status + * + * DESCRIPTION: Descending callback used during the loading of ACPI tables. + * Currently used to detect methods that must be marked serialized + * in order to avoid problems with the creation of named objects. + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiDsDetectNamedOpcodes ( + ACPI_WALK_STATE *WalkState, + ACPI_PARSE_OBJECT **OutOp) +{ + + ACPI_FUNCTION_NAME (AcpiDsDetectNamedOpcodes); + + + /* We are only interested in opcodes that create a new name */ + + if (!(WalkState->OpInfo->Flags & (AML_NAMED | AML_CREATE | AML_FIELD))) + { + return (AE_OK); + } + + /* + * At this point, we know we have a Named object opcode. + * Mark the method as serialized. Later code will create a mutex for + * this method to enforce serialization. + * + * Note, ACPI_METHOD_IGNORE_SYNC_LEVEL flag means that we will ignore the + * Sync Level mechanism for this method, even though it is now serialized. + * Otherwise, there can be conflicts with existing ASL code that actually + * uses sync levels. + */ + WalkState->MethodDesc->Method.SyncLevel = 0; + WalkState->MethodDesc->Method.InfoFlags |= + (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL); + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Method serialized [%4.4s] %p - [%s] (%4.4X)\n", + WalkState->MethodNode->Name.Ascii, WalkState->MethodNode, + WalkState->OpInfo->Name, WalkState->Opcode)); + + /* Abort the parse, no need to examine this method any further */ + + return (AE_CTRL_TERMINATE); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsMethodError + * + * PARAMETERS: Status - Execution status + * WalkState - Current state + * + * RETURN: Status + * + * DESCRIPTION: Called on method error. Invoke the global exception handler if + * present, dump the method data if the debugger is configured + * + * Note: Allows the exception handler to change the status code + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsMethodError ( + ACPI_STATUS Status, + ACPI_WALK_STATE *WalkState) +{ + UINT32 AmlOffset; + + + ACPI_FUNCTION_ENTRY (); + + + /* Ignore AE_OK and control exception codes */ + + if (ACPI_SUCCESS (Status) || + (Status & AE_CODE_CONTROL)) + { + return (Status); + } + + /* Invoke the global exception handler */ + + if (AcpiGbl_ExceptionHandler) + { + /* Exit the interpreter, allow handler to execute methods */ + + AcpiExExitInterpreter (); + + /* + * Handler can map the exception code to anything it wants, including + * AE_OK, in which case the executing method will not be aborted. + */ + AmlOffset = (UINT32) ACPI_PTR_DIFF (WalkState->Aml, + WalkState->ParserState.AmlStart); + + Status = AcpiGbl_ExceptionHandler (Status, + WalkState->MethodNode ? + WalkState->MethodNode->Name.Integer : 0, + WalkState->Opcode, AmlOffset, NULL); + AcpiExEnterInterpreter (); + } + + AcpiDsClearImplicitReturn (WalkState); + + if (ACPI_FAILURE (Status)) + { + AcpiDsDumpMethodStack (Status, WalkState, WalkState->Op); + + /* Display method locals/args if debugger is present */ + +#ifdef ACPI_DEBUGGER + AcpiDbDumpMethodInfo (Status, WalkState); +#endif + } + + return (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsCreateMethodMutex + * + * PARAMETERS: ObjDesc - The method object + * + * RETURN: Status + * + * DESCRIPTION: Create a mutex object for a serialized control method + * + ******************************************************************************/ + +static ACPI_STATUS +AcpiDsCreateMethodMutex ( + ACPI_OPERAND_OBJECT *MethodDesc) +{ + ACPI_OPERAND_OBJECT *MutexDesc; + ACPI_STATUS Status; + + + ACPI_FUNCTION_TRACE (DsCreateMethodMutex); + + + /* Create the new mutex object */ + + MutexDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX); + if (!MutexDesc) + { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Create the actual OS Mutex */ + + Status = AcpiOsCreateMutex (&MutexDesc->Mutex.OsMutex); + if (ACPI_FAILURE (Status)) + { + AcpiUtDeleteObjectDesc (MutexDesc); + return_ACPI_STATUS (Status); + } + + MutexDesc->Mutex.SyncLevel = MethodDesc->Method.SyncLevel; + MethodDesc->Method.Mutex = MutexDesc; + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsBeginMethodExecution + * + * PARAMETERS: MethodNode - Node of the method + * ObjDesc - The method object + * WalkState - current state, NULL if not yet executing + * a method. + * + * RETURN: Status + * + * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, + * increments the thread count, and waits at the method semaphore + * for clearance to execute. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsBeginMethodExecution ( + ACPI_NAMESPACE_NODE *MethodNode, + ACPI_OPERAND_OBJECT *ObjDesc, + ACPI_WALK_STATE *WalkState) +{ + ACPI_STATUS Status = AE_OK; + + + ACPI_FUNCTION_TRACE_PTR (DsBeginMethodExecution, MethodNode); + + + if (!MethodNode) + { + return_ACPI_STATUS (AE_NULL_ENTRY); + } + + AcpiExStartTraceMethod (MethodNode, ObjDesc, WalkState); + + /* Prevent wraparound of thread count */ + + if (ObjDesc->Method.ThreadCount == ACPI_UINT8_MAX) + { + ACPI_ERROR ((AE_INFO, + "Method reached maximum reentrancy limit (255)")); + return_ACPI_STATUS (AE_AML_METHOD_LIMIT); + } + + /* + * If this method is serialized, we need to acquire the method mutex. + */ + if (ObjDesc->Method.InfoFlags & ACPI_METHOD_SERIALIZED) + { + /* + * Create a mutex for the method if it is defined to be Serialized + * and a mutex has not already been created. We defer the mutex creation + * until a method is actually executed, to minimize the object count + */ + if (!ObjDesc->Method.Mutex) + { + Status = AcpiDsCreateMethodMutex (ObjDesc); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + } + + /* + * The CurrentSyncLevel (per-thread) must be less than or equal to + * the sync level of the method. This mechanism provides some + * deadlock prevention. + * + * If the method was auto-serialized, we just ignore the sync level + * mechanism, because auto-serialization of methods can interfere + * with ASL code that actually uses sync levels. + * + * Top-level method invocation has no walk state at this point + */ + if (WalkState && + (!(ObjDesc->Method.InfoFlags & ACPI_METHOD_IGNORE_SYNC_LEVEL)) && + (WalkState->Thread->CurrentSyncLevel > + ObjDesc->Method.Mutex->Mutex.SyncLevel)) + { + ACPI_ERROR ((AE_INFO, + "Cannot acquire Mutex for method [%4.4s]" + ", current SyncLevel is too large (%u)", + AcpiUtGetNodeName (MethodNode), + WalkState->Thread->CurrentSyncLevel)); + + return_ACPI_STATUS (AE_AML_MUTEX_ORDER); + } + + /* + * Obtain the method mutex if necessary. Do not acquire mutex for a + * recursive call. + */ + if (!WalkState || + !ObjDesc->Method.Mutex->Mutex.ThreadId || + (WalkState->Thread->ThreadId != + ObjDesc->Method.Mutex->Mutex.ThreadId)) + { + /* + * Acquire the method mutex. This releases the interpreter if we + * block (and reacquires it before it returns) + */ + Status = AcpiExSystemWaitMutex ( + ObjDesc->Method.Mutex->Mutex.OsMutex, ACPI_WAIT_FOREVER); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + /* Update the mutex and walk info and save the original SyncLevel */ + + if (WalkState) + { + ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel = + WalkState->Thread->CurrentSyncLevel; + + ObjDesc->Method.Mutex->Mutex.ThreadId = + WalkState->Thread->ThreadId; + + /* + * Update the current SyncLevel only if this is not an auto- + * serialized method. In the auto case, we have to ignore + * the sync level for the method mutex (created for the + * auto-serialization) because we have no idea of what the + * sync level should be. Therefore, just ignore it. + */ + if (!(ObjDesc->Method.InfoFlags & + ACPI_METHOD_IGNORE_SYNC_LEVEL)) + { + WalkState->Thread->CurrentSyncLevel = + ObjDesc->Method.SyncLevel; + } + } + else + { + ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel = + ObjDesc->Method.Mutex->Mutex.SyncLevel; + + ObjDesc->Method.Mutex->Mutex.ThreadId = + AcpiOsGetThreadId (); + } + } + + /* Always increase acquisition depth */ + + ObjDesc->Method.Mutex->Mutex.AcquisitionDepth++; + } + + /* + * Allocate an Owner ID for this method, only if this is the first thread + * to begin concurrent execution. We only need one OwnerId, even if the + * method is invoked recursively. + */ + if (!ObjDesc->Method.OwnerId) + { + Status = AcpiUtAllocateOwnerId (&ObjDesc->Method.OwnerId); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + } + + /* + * Increment the method parse tree thread count since it has been + * reentered one more time (even if it is the same thread) + */ + ObjDesc->Method.ThreadCount++; + AcpiMethodCount++; + return_ACPI_STATUS (Status); + + +Cleanup: + /* On error, must release the method mutex (if present) */ + + if (ObjDesc->Method.Mutex) + { + AcpiOsReleaseMutex (ObjDesc->Method.Mutex->Mutex.OsMutex); + } + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsCallControlMethod + * + * PARAMETERS: Thread - Info for this thread + * ThisWalkState - Current walk state + * Op - Current Op to be walked + * + * RETURN: Status + * + * DESCRIPTION: Transfer execution to a called control method + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsCallControlMethod ( + ACPI_THREAD_STATE *Thread, + ACPI_WALK_STATE *ThisWalkState, + ACPI_PARSE_OBJECT *Op) +{ + ACPI_STATUS Status; + ACPI_NAMESPACE_NODE *MethodNode; + ACPI_WALK_STATE *NextWalkState = NULL; + ACPI_OPERAND_OBJECT *ObjDesc; + ACPI_EVALUATE_INFO *Info; + UINT32 i; + + + ACPI_FUNCTION_TRACE_PTR (DsCallControlMethod, ThisWalkState); + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "Calling method %p, currentstate=%p\n", + ThisWalkState->PrevOp, ThisWalkState)); + + /* + * Get the namespace entry for the control method we are about to call + */ + MethodNode = ThisWalkState->MethodCallNode; + if (!MethodNode) + { + return_ACPI_STATUS (AE_NULL_ENTRY); + } + + ObjDesc = AcpiNsGetAttachedObject (MethodNode); + if (!ObjDesc) + { + return_ACPI_STATUS (AE_NULL_OBJECT); + } + + /* Init for new method, possibly wait on method mutex */ + + Status = AcpiDsBeginMethodExecution ( + MethodNode, ObjDesc, ThisWalkState); + if (ACPI_FAILURE (Status)) + { + return_ACPI_STATUS (Status); + } + + /* Begin method parse/execution. Create a new walk state */ + + NextWalkState = AcpiDsCreateWalkState ( + ObjDesc->Method.OwnerId, NULL, ObjDesc, Thread); + if (!NextWalkState) + { + Status = AE_NO_MEMORY; + goto Cleanup; + } + + /* + * The resolved arguments were put on the previous walk state's operand + * stack. Operands on the previous walk state stack always + * start at index 0. Also, null terminate the list of arguments + */ + ThisWalkState->Operands [ThisWalkState->NumOperands] = NULL; + + /* + * Allocate and initialize the evaluation information block + * TBD: this is somewhat inefficient, should change interface to + * DsInitAmlWalk. For now, keeps this struct off the CPU stack + */ + Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); + if (!Info) + { + Status = AE_NO_MEMORY; + goto Cleanup; + } + + Info->Parameters = &ThisWalkState->Operands[0]; + + Status = AcpiDsInitAmlWalk (NextWalkState, NULL, MethodNode, + ObjDesc->Method.AmlStart, ObjDesc->Method.AmlLength, + Info, ACPI_IMODE_EXECUTE); + + ACPI_FREE (Info); + if (ACPI_FAILURE (Status)) + { + goto Cleanup; + } + + /* + * Delete the operands on the previous walkstate operand stack + * (they were copied to new objects) + */ + for (i = 0; i < ObjDesc->Method.ParamCount; i++) + { + AcpiUtRemoveReference (ThisWalkState->Operands [i]); + ThisWalkState->Operands [i] = NULL; + } + + /* Clear the operand stack */ + + ThisWalkState->NumOperands = 0; + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "**** Begin nested execution of [%4.4s] **** WalkState=%p\n", + MethodNode->Name.Ascii, NextWalkState)); + + /* Invoke an internal method if necessary */ + + if (ObjDesc->Method.InfoFlags & ACPI_METHOD_INTERNAL_ONLY) + { + Status = ObjDesc->Method.Dispatch.Implementation (NextWalkState); + if (Status == AE_OK) + { + Status = AE_CTRL_TERMINATE; + } + } + + return_ACPI_STATUS (Status); + + +Cleanup: + + /* On error, we must terminate the method properly */ + + AcpiDsTerminateControlMethod (ObjDesc, NextWalkState); + AcpiDsDeleteWalkState (NextWalkState); + + return_ACPI_STATUS (Status); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsRestartControlMethod + * + * PARAMETERS: WalkState - State for preempted method (caller) + * ReturnDesc - Return value from the called method + * + * RETURN: Status + * + * DESCRIPTION: Restart a method that was preempted by another (nested) method + * invocation. Handle the return value (if any) from the callee. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiDsRestartControlMethod ( + ACPI_WALK_STATE *WalkState, + ACPI_OPERAND_OBJECT *ReturnDesc) +{ + ACPI_STATUS Status; + int SameAsImplicitReturn; + + + ACPI_FUNCTION_TRACE_PTR (DsRestartControlMethod, WalkState); + + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n", + AcpiUtGetNodeName (WalkState->MethodNode), + WalkState->MethodCallOp, ReturnDesc)); + + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + " ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n", + WalkState->ReturnUsed, + WalkState->Results, WalkState)); + + /* Did the called method return a value? */ + + if (ReturnDesc) + { + /* Is the implicit return object the same as the return desc? */ + + SameAsImplicitReturn = (WalkState->ImplicitReturnObj == ReturnDesc); + + /* Are we actually going to use the return value? */ + + if (WalkState->ReturnUsed) + { + /* Save the return value from the previous method */ + + Status = AcpiDsResultPush (ReturnDesc, WalkState); + if (ACPI_FAILURE (Status)) + { + AcpiUtRemoveReference (ReturnDesc); + return_ACPI_STATUS (Status); + } + + /* + * Save as THIS method's return value in case it is returned + * immediately to yet another method + */ + WalkState->ReturnDesc = ReturnDesc; + } + + /* + * The following code is the optional support for the so-called + * "implicit return". Some AML code assumes that the last value of the + * method is "implicitly" returned to the caller, in the absence of an + * explicit return value. + * + * Just save the last result of the method as the return value. + * + * NOTE: this is optional because the ASL language does not actually + * support this behavior. + */ + else if (!AcpiDsDoImplicitReturn (ReturnDesc, WalkState, FALSE) || + SameAsImplicitReturn) + { + /* + * Delete the return value if it will not be used by the + * calling method or remove one reference if the explicit return + * is the same as the implicit return value. + */ + AcpiUtRemoveReference (ReturnDesc); + } + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiDsTerminateControlMethod + * + * PARAMETERS: MethodDesc - Method object + * WalkState - State associated with the method + * + * RETURN: None + * + * DESCRIPTION: Terminate a control method. Delete everything that the method + * created, delete all locals and arguments, and delete the parse + * tree if requested. + * + * MUTEX: Interpreter is locked + * + ******************************************************************************/ + +void +AcpiDsTerminateControlMethod ( + ACPI_OPERAND_OBJECT *MethodDesc, + ACPI_WALK_STATE *WalkState) +{ + + ACPI_FUNCTION_TRACE_PTR (DsTerminateControlMethod, WalkState); + + + /* MethodDesc is required, WalkState is optional */ + + if (!MethodDesc) + { + return_VOID; + } + + if (WalkState) + { + /* Delete all arguments and locals */ + + AcpiDsMethodDataDeleteAll (WalkState); + + /* + * If method is serialized, release the mutex and restore the + * current sync level for this thread + */ + if (MethodDesc->Method.Mutex) + { + /* Acquisition Depth handles recursive calls */ + + MethodDesc->Method.Mutex->Mutex.AcquisitionDepth--; + if (!MethodDesc->Method.Mutex->Mutex.AcquisitionDepth) + { + WalkState->Thread->CurrentSyncLevel = + MethodDesc->Method.Mutex->Mutex.OriginalSyncLevel; + + AcpiOsReleaseMutex ( + MethodDesc->Method.Mutex->Mutex.OsMutex); + MethodDesc->Method.Mutex->Mutex.ThreadId = 0; + } + } + + /* + * Delete any namespace objects created anywhere within the + * namespace by the execution of this method. Unless: + * 1) This method is a module-level executable code method, in which + * case we want make the objects permanent. + * 2) There are other threads executing the method, in which case we + * will wait until the last thread has completed. + */ + if (!(MethodDesc->Method.InfoFlags & ACPI_METHOD_MODULE_LEVEL) && + (MethodDesc->Method.ThreadCount == 1)) + { + /* Delete any direct children of (created by) this method */ + + AcpiNsDeleteNamespaceSubtree (WalkState->MethodNode); + + /* + * Delete any objects that were created by this method + * elsewhere in the namespace (if any were created). + * Use of the ACPI_METHOD_MODIFIED_NAMESPACE optimizes the + * deletion such that we don't have to perform an entire + * namespace walk for every control method execution. + */ + if (MethodDesc->Method.InfoFlags & ACPI_METHOD_MODIFIED_NAMESPACE) + { + AcpiNsDeleteNamespaceByOwner (MethodDesc->Method.OwnerId); + MethodDesc->Method.InfoFlags &= + ~ACPI_METHOD_MODIFIED_NAMESPACE; + } + } + } + + /* Decrement the thread count on the method */ + + if (MethodDesc->Method.ThreadCount) + { + MethodDesc->Method.ThreadCount--; + } + else + { + ACPI_ERROR ((AE_INFO, + "Invalid zero thread count in method")); + } + + /* Are there any other threads currently executing this method? */ + + if (MethodDesc->Method.ThreadCount) + { + /* + * Additional threads. Do not release the OwnerId in this case, + * we immediately reuse it for the next thread executing this method + */ + ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, + "*** Completed execution of one thread, %u threads remaining\n", + MethodDesc->Method.ThreadCount)); + } + else + { + /* This is the only executing thread for this method */ + + /* + * Support to dynamically change a method from NotSerialized to + * Serialized if it appears that the method is incorrectly written and + * does not support multiple thread execution. The best example of this + * is if such a method creates namespace objects and blocks. A second + * thread will fail with an AE_ALREADY_EXISTS exception. + * + * This code is here because we must wait until the last thread exits + * before marking the method as serialized. + */ + if (MethodDesc->Method.InfoFlags & ACPI_METHOD_SERIALIZED_PENDING) + { + if (WalkState) + { + ACPI_INFO (( + "Marking method %4.4s as Serialized " + "because of AE_ALREADY_EXISTS error", + WalkState->MethodNode->Name.Ascii)); + } + + /* + * Method tried to create an object twice and was marked as + * "pending serialized". The probable cause is that the method + * cannot handle reentrancy. + * + * The method was created as NotSerialized, but it tried to create + * a named object and then blocked, causing the second thread + * entrance to begin and then fail. Workaround this problem by + * marking the method permanently as Serialized when the last + * thread exits here. + */ + MethodDesc->Method.InfoFlags &= + ~ACPI_METHOD_SERIALIZED_PENDING; + + MethodDesc->Method.InfoFlags |= + (ACPI_METHOD_SERIALIZED | ACPI_METHOD_IGNORE_SYNC_LEVEL); + MethodDesc->Method.SyncLevel = 0; + } + + /* No more threads, we can free the OwnerId */ + + if (!(MethodDesc->Method.InfoFlags & ACPI_METHOD_MODULE_LEVEL)) + { + AcpiUtReleaseOwnerId (&MethodDesc->Method.OwnerId); + } + } + + AcpiExStopTraceMethod ((ACPI_NAMESPACE_NODE *) MethodDesc->Method.Node, + MethodDesc, WalkState); + + return_VOID; +} |