| 0,0 → 1,626 |
|---|
| |
| /****************************************************************************** |
| * |
| * Module Name: exmutex - ASL Mutex Acquire/Release functions |
| * |
| *****************************************************************************/ |
| |
| /****************************************************************************** |
| * |
| * 1. Copyright Notice |
| * |
| * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp. |
| * All rights reserved. |
| * |
| * 2. License |
| * |
| * 2.1. This is your license from Intel Corp. under its intellectual property |
| * rights. You may have additional license terms from the party that provided |
| * you this software, covering your right to use that party's intellectual |
| * property rights. |
| * |
| * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a |
| * copy of the source code appearing in this file ("Covered Code") an |
| * irrevocable, perpetual, worldwide license under Intel's copyrights in the |
| * base code distributed originally by Intel ("Original Intel Code") to copy, |
| * make derivatives, distribute, use and display any portion of the Covered |
| * Code in any form, with the right to sublicense such rights; and |
| * |
| * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent |
| * license (with the right to sublicense), under only those claims of Intel |
| * patents that are infringed by the Original Intel Code, to make, use, sell, |
| * offer to sell, and import the Covered Code and derivative works thereof |
| * solely to the minimum extent necessary to exercise the above copyright |
| * license, and in no event shall the patent license extend to any additions |
| * to or modifications of the Original Intel Code. No other license or right |
| * is granted directly or by implication, estoppel or otherwise; |
| * |
| * The above copyright and patent license is granted only if the following |
| * conditions are met: |
| * |
| * 3. Conditions |
| * |
| * 3.1. Redistribution of Source with Rights to Further Distribute Source. |
| * Redistribution of source code of any substantial portion of the Covered |
| * Code or modification with rights to further distribute source must include |
| * the above Copyright Notice, the above License, this list of Conditions, |
| * and the following Disclaimer and Export Compliance provision. In addition, |
| * Licensee must cause all Covered Code to which Licensee contributes to |
| * contain a file documenting the changes Licensee made to create that Covered |
| * Code and the date of any change. Licensee must include in that file the |
| * documentation of any changes made by any predecessor Licensee. Licensee |
| * must include a prominent statement that the modification is derived, |
| * directly or indirectly, from Original Intel Code. |
| * |
| * 3.2. Redistribution of Source with no Rights to Further Distribute Source. |
| * Redistribution of source code of any substantial portion of the Covered |
| * Code or modification without rights to further distribute source must |
| * include the following Disclaimer and Export Compliance provision in the |
| * documentation and/or other materials provided with distribution. In |
| * addition, Licensee may not authorize further sublicense of source of any |
| * portion of the Covered Code, and must include terms to the effect that the |
| * license from Licensee to its licensee is limited to the intellectual |
| * property embodied in the software Licensee provides to its licensee, and |
| * not to intellectual property embodied in modifications its licensee may |
| * make. |
| * |
| * 3.3. Redistribution of Executable. Redistribution in executable form of any |
| * substantial portion of the Covered Code or modification must reproduce the |
| * above Copyright Notice, and the following Disclaimer and Export Compliance |
| * provision in the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3.4. Intel retains all right, title, and interest in and to the Original |
| * Intel Code. |
| * |
| * 3.5. Neither the name Intel nor any other trademark owned or controlled by |
| * Intel shall be used in advertising or otherwise to promote the sale, use or |
| * other dealings in products derived from or relating to the Covered Code |
| * without prior written authorization from Intel. |
| * |
| * 4. Disclaimer and Export Compliance |
| * |
| * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED |
| * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE |
| * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, |
| * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY |
| * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY |
| * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A |
| * PARTICULAR PURPOSE. |
| * |
| * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES |
| * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR |
| * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, |
| * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY |
| * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL |
| * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS |
| * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY |
| * LIMITED REMEDY. |
| * |
| * 4.3. Licensee shall not export, either directly or indirectly, any of this |
| * software or system incorporating such software without first obtaining any |
| * required license or other approval from the U. S. Department of Commerce or |
| * any other agency or department of the United States Government. In the |
| * event Licensee exports any such software from the United States or |
| * re-exports any such software from a foreign destination, Licensee shall |
| * ensure that the distribution and export/re-export of the software is in |
| * compliance with all laws, regulations, orders, or other restrictions of the |
| * U.S. Export Administration Regulations. Licensee agrees that neither it nor |
| * any of its subsidiaries will export/re-export any technical data, process, |
| * software, or service, directly or indirectly, to any country for which the |
| * United States government or any agency thereof requires an export license, |
| * other governmental approval, or letter of assurance, without first obtaining |
| * such license, approval or letter. |
| * |
| *****************************************************************************/ |
| |
| #define __EXMUTEX_C__ |
| |
| #include "acpi.h" |
| #include "accommon.h" |
| #include "acinterp.h" |
| #include "acevents.h" |
| |
| #define _COMPONENT ACPI_EXECUTER |
| ACPI_MODULE_NAME ("exmutex") |
| |
| /* Local prototypes */ |
| |
| static void |
| AcpiExLinkMutex ( |
| ACPI_OPERAND_OBJECT *ObjDesc, |
| ACPI_THREAD_STATE *Thread); |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExUnlinkMutex |
| * |
| * PARAMETERS: ObjDesc - The mutex to be unlinked |
| * |
| * RETURN: None |
| * |
| * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list |
| * |
| ******************************************************************************/ |
| |
| void |
| AcpiExUnlinkMutex ( |
| ACPI_OPERAND_OBJECT *ObjDesc) |
| { |
| ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread; |
| |
| |
| if (!Thread) |
| { |
| return; |
| } |
| |
| /* Doubly linked list */ |
| |
| if (ObjDesc->Mutex.Next) |
| { |
| (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev; |
| } |
| |
| if (ObjDesc->Mutex.Prev) |
| { |
| (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next; |
| |
| /* |
| * Migrate the previous sync level associated with this mutex to |
| * the previous mutex on the list so that it may be preserved. |
| * This handles the case where several mutexes have been acquired |
| * at the same level, but are not released in opposite order. |
| */ |
| (ObjDesc->Mutex.Prev)->Mutex.OriginalSyncLevel = |
| ObjDesc->Mutex.OriginalSyncLevel; |
| } |
| else |
| { |
| Thread->AcquiredMutexList = ObjDesc->Mutex.Next; |
| } |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExLinkMutex |
| * |
| * PARAMETERS: ObjDesc - The mutex to be linked |
| * Thread - Current executing thread object |
| * |
| * RETURN: None |
| * |
| * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk |
| * |
| ******************************************************************************/ |
| |
| static void |
| AcpiExLinkMutex ( |
| ACPI_OPERAND_OBJECT *ObjDesc, |
| ACPI_THREAD_STATE *Thread) |
| { |
| ACPI_OPERAND_OBJECT *ListHead; |
| |
| |
| ListHead = Thread->AcquiredMutexList; |
| |
| /* This object will be the first object in the list */ |
| |
| ObjDesc->Mutex.Prev = NULL; |
| ObjDesc->Mutex.Next = ListHead; |
| |
| /* Update old first object to point back to this object */ |
| |
| if (ListHead) |
| { |
| ListHead->Mutex.Prev = ObjDesc; |
| } |
| |
| /* Update list head */ |
| |
| Thread->AcquiredMutexList = ObjDesc; |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExAcquireMutexObject |
| * |
| * PARAMETERS: Timeout - Timeout in milliseconds |
| * ObjDesc - Mutex object |
| * ThreadId - Current thread state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common |
| * path that supports multiple acquires by the same thread. |
| * |
| * MUTEX: Interpreter must be locked |
| * |
| * NOTE: This interface is called from three places: |
| * 1) From AcpiExAcquireMutex, via an AML Acquire() operator |
| * 2) From AcpiExAcquireGlobalLock when an AML Field access requires the |
| * global lock |
| * 3) From the external interface, AcpiAcquireGlobalLock |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExAcquireMutexObject ( |
| UINT16 Timeout, |
| ACPI_OPERAND_OBJECT *ObjDesc, |
| ACPI_THREAD_ID ThreadId) |
| { |
| ACPI_STATUS Status; |
| |
| |
| ACPI_FUNCTION_TRACE_PTR (ExAcquireMutexObject, ObjDesc); |
| |
| |
| if (!ObjDesc) |
| { |
| return_ACPI_STATUS (AE_BAD_PARAMETER); |
| } |
| |
| /* Support for multiple acquires by the owning thread */ |
| |
| if (ObjDesc->Mutex.ThreadId == ThreadId) |
| { |
| /* |
| * The mutex is already owned by this thread, just increment the |
| * acquisition depth |
| */ |
| ObjDesc->Mutex.AcquisitionDepth++; |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| /* Acquire the mutex, wait if necessary. Special case for Global Lock */ |
| |
| if (ObjDesc == AcpiGbl_GlobalLockMutex) |
| { |
| Status = AcpiEvAcquireGlobalLock (Timeout); |
| } |
| else |
| { |
| Status = AcpiExSystemWaitMutex (ObjDesc->Mutex.OsMutex, |
| Timeout); |
| } |
| |
| if (ACPI_FAILURE (Status)) |
| { |
| /* Includes failure from a timeout on TimeDesc */ |
| |
| return_ACPI_STATUS (Status); |
| } |
| |
| /* Acquired the mutex: update mutex object */ |
| |
| ObjDesc->Mutex.ThreadId = ThreadId; |
| ObjDesc->Mutex.AcquisitionDepth = 1; |
| ObjDesc->Mutex.OriginalSyncLevel = 0; |
| ObjDesc->Mutex.OwnerThread = NULL; /* Used only for AML Acquire() */ |
| |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExAcquireMutex |
| * |
| * PARAMETERS: TimeDesc - Timeout integer |
| * ObjDesc - Mutex object |
| * WalkState - Current method execution state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Acquire an AML mutex |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExAcquireMutex ( |
| ACPI_OPERAND_OBJECT *TimeDesc, |
| ACPI_OPERAND_OBJECT *ObjDesc, |
| ACPI_WALK_STATE *WalkState) |
| { |
| ACPI_STATUS Status; |
| |
| |
| ACPI_FUNCTION_TRACE_PTR (ExAcquireMutex, ObjDesc); |
| |
| |
| if (!ObjDesc) |
| { |
| return_ACPI_STATUS (AE_BAD_PARAMETER); |
| } |
| |
| /* Must have a valid thread state struct */ |
| |
| if (!WalkState->Thread) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Cannot acquire Mutex [%4.4s], null thread info", |
| AcpiUtGetNodeName (ObjDesc->Mutex.Node))); |
| return_ACPI_STATUS (AE_AML_INTERNAL); |
| } |
| |
| /* |
| * Current sync level must be less than or equal to the sync level of the |
| * mutex. This mechanism provides some deadlock prevention |
| */ |
| if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%u)", |
| AcpiUtGetNodeName (ObjDesc->Mutex.Node), |
| WalkState->Thread->CurrentSyncLevel)); |
| return_ACPI_STATUS (AE_AML_MUTEX_ORDER); |
| } |
| |
| Status = AcpiExAcquireMutexObject ((UINT16) TimeDesc->Integer.Value, |
| ObjDesc, WalkState->Thread->ThreadId); |
| if (ACPI_SUCCESS (Status) && ObjDesc->Mutex.AcquisitionDepth == 1) |
| { |
| /* Save Thread object, original/current sync levels */ |
| |
| ObjDesc->Mutex.OwnerThread = WalkState->Thread; |
| ObjDesc->Mutex.OriginalSyncLevel = WalkState->Thread->CurrentSyncLevel; |
| WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel; |
| |
| /* Link the mutex to the current thread for force-unlock at method exit */ |
| |
| AcpiExLinkMutex (ObjDesc, WalkState->Thread); |
| } |
| |
| return_ACPI_STATUS (Status); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExReleaseMutexObject |
| * |
| * PARAMETERS: ObjDesc - The object descriptor for this op |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Release a previously acquired Mutex, low level interface. |
| * Provides a common path that supports multiple releases (after |
| * previous multiple acquires) by the same thread. |
| * |
| * MUTEX: Interpreter must be locked |
| * |
| * NOTE: This interface is called from three places: |
| * 1) From AcpiExReleaseMutex, via an AML Acquire() operator |
| * 2) From AcpiExReleaseGlobalLock when an AML Field access requires the |
| * global lock |
| * 3) From the external interface, AcpiReleaseGlobalLock |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExReleaseMutexObject ( |
| ACPI_OPERAND_OBJECT *ObjDesc) |
| { |
| ACPI_STATUS Status = AE_OK; |
| |
| |
| ACPI_FUNCTION_TRACE (ExReleaseMutexObject); |
| |
| |
| if (ObjDesc->Mutex.AcquisitionDepth == 0) |
| { |
| return (AE_NOT_ACQUIRED); |
| } |
| |
| /* Match multiple Acquires with multiple Releases */ |
| |
| ObjDesc->Mutex.AcquisitionDepth--; |
| if (ObjDesc->Mutex.AcquisitionDepth != 0) |
| { |
| /* Just decrement the depth and return */ |
| |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| if (ObjDesc->Mutex.OwnerThread) |
| { |
| /* Unlink the mutex from the owner's list */ |
| |
| AcpiExUnlinkMutex (ObjDesc); |
| ObjDesc->Mutex.OwnerThread = NULL; |
| } |
| |
| /* Release the mutex, special case for Global Lock */ |
| |
| if (ObjDesc == AcpiGbl_GlobalLockMutex) |
| { |
| Status = AcpiEvReleaseGlobalLock (); |
| } |
| else |
| { |
| AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex); |
| } |
| |
| /* Clear mutex info */ |
| |
| ObjDesc->Mutex.ThreadId = 0; |
| return_ACPI_STATUS (Status); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExReleaseMutex |
| * |
| * PARAMETERS: ObjDesc - The object descriptor for this op |
| * WalkState - Current method execution state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Release a previously acquired Mutex. |
| * |
| ******************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiExReleaseMutex ( |
| ACPI_OPERAND_OBJECT *ObjDesc, |
| ACPI_WALK_STATE *WalkState) |
| { |
| ACPI_STATUS Status = AE_OK; |
| UINT8 PreviousSyncLevel; |
| ACPI_THREAD_STATE *OwnerThread; |
| |
| |
| ACPI_FUNCTION_TRACE (ExReleaseMutex); |
| |
| |
| if (!ObjDesc) |
| { |
| return_ACPI_STATUS (AE_BAD_PARAMETER); |
| } |
| |
| OwnerThread = ObjDesc->Mutex.OwnerThread; |
| |
| /* The mutex must have been previously acquired in order to release it */ |
| |
| if (!OwnerThread) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Cannot release Mutex [%4.4s], not acquired", |
| AcpiUtGetNodeName (ObjDesc->Mutex.Node))); |
| return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED); |
| } |
| |
| /* Must have a valid thread ID */ |
| |
| if (!WalkState->Thread) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Cannot release Mutex [%4.4s], null thread info", |
| AcpiUtGetNodeName (ObjDesc->Mutex.Node))); |
| return_ACPI_STATUS (AE_AML_INTERNAL); |
| } |
| |
| /* |
| * The Mutex is owned, but this thread must be the owner. |
| * Special case for Global Lock, any thread can release |
| */ |
| if ((OwnerThread->ThreadId != WalkState->Thread->ThreadId) && |
| (ObjDesc != AcpiGbl_GlobalLockMutex)) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Thread %p cannot release Mutex [%4.4s] acquired by thread %p", |
| ACPI_CAST_PTR (void, WalkState->Thread->ThreadId), |
| AcpiUtGetNodeName (ObjDesc->Mutex.Node), |
| ACPI_CAST_PTR (void, OwnerThread->ThreadId))); |
| return_ACPI_STATUS (AE_AML_NOT_OWNER); |
| } |
| |
| /* |
| * The sync level of the mutex must be equal to the current sync level. In |
| * other words, the current level means that at least one mutex at that |
| * level is currently being held. Attempting to release a mutex of a |
| * different level can only mean that the mutex ordering rule is being |
| * violated. This behavior is clarified in ACPI 4.0 specification. |
| */ |
| if (ObjDesc->Mutex.SyncLevel != OwnerThread->CurrentSyncLevel) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Cannot release Mutex [%4.4s], SyncLevel mismatch: mutex %u current %u", |
| AcpiUtGetNodeName (ObjDesc->Mutex.Node), |
| ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel)); |
| return_ACPI_STATUS (AE_AML_MUTEX_ORDER); |
| } |
| |
| /* |
| * Get the previous SyncLevel from the head of the acquired mutex list. |
| * This handles the case where several mutexes at the same level have been |
| * acquired, but are not released in reverse order. |
| */ |
| PreviousSyncLevel = |
| OwnerThread->AcquiredMutexList->Mutex.OriginalSyncLevel; |
| |
| Status = AcpiExReleaseMutexObject (ObjDesc); |
| if (ACPI_FAILURE (Status)) |
| { |
| return_ACPI_STATUS (Status); |
| } |
| |
| if (ObjDesc->Mutex.AcquisitionDepth == 0) |
| { |
| /* Restore the previous SyncLevel */ |
| |
| OwnerThread->CurrentSyncLevel = PreviousSyncLevel; |
| } |
| |
| return_ACPI_STATUS (Status); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiExReleaseAllMutexes |
| * |
| * PARAMETERS: Thread - Current executing thread object |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Release all mutexes held by this thread |
| * |
| * NOTE: This function is called as the thread is exiting the interpreter. |
| * Mutexes are not released when an individual control method is exited, but |
| * only when the parent thread actually exits the interpreter. This allows one |
| * method to acquire a mutex, and a different method to release it, as long as |
| * this is performed underneath a single parent control method. |
| * |
| ******************************************************************************/ |
| |
| void |
| AcpiExReleaseAllMutexes ( |
| ACPI_THREAD_STATE *Thread) |
| { |
| ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList; |
| ACPI_OPERAND_OBJECT *ObjDesc; |
| |
| |
| ACPI_FUNCTION_ENTRY (); |
| |
| |
| /* Traverse the list of owned mutexes, releasing each one */ |
| |
| while (Next) |
| { |
| ObjDesc = Next; |
| Next = ObjDesc->Mutex.Next; |
| |
| ObjDesc->Mutex.Prev = NULL; |
| ObjDesc->Mutex.Next = NULL; |
| ObjDesc->Mutex.AcquisitionDepth = 0; |
| |
| /* Release the mutex, special case for Global Lock */ |
| |
| if (ObjDesc == AcpiGbl_GlobalLockMutex) |
| { |
| /* Ignore errors */ |
| |
| (void) AcpiEvReleaseGlobalLock (); |
| } |
| else |
| { |
| AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex); |
| } |
| |
| /* Mark mutex unowned */ |
| |
| ObjDesc->Mutex.OwnerThread = NULL; |
| ObjDesc->Mutex.ThreadId = 0; |
| |
| /* Update Thread SyncLevel (Last mutex is the important one) */ |
| |
| Thread->CurrentSyncLevel = ObjDesc->Mutex.OriginalSyncLevel; |
| } |
| } |