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