398 lines
11 KiB
C
398 lines
11 KiB
C
/*******************************************************************************
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*
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* Module Name: utmutex - local mutex support
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2012, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#define __UTMUTEX_C__
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#include "acpi.h"
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#include "accommon.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME ("utmutex")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiUtCreateMutex (
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ACPI_MUTEX_HANDLE MutexId);
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static void
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AcpiUtDeleteMutex (
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ACPI_MUTEX_HANDLE MutexId);
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtMutexInitialize
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*
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* PARAMETERS: None.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create the system mutex objects. This includes mutexes,
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* spin locks, and reader/writer locks.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtMutexInitialize (
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void)
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{
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UINT32 i;
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ACPI_STATUS Status;
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ACPI_FUNCTION_TRACE (UtMutexInitialize);
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/* Create each of the predefined mutex objects */
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for (i = 0; i < ACPI_NUM_MUTEX; i++)
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{
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Status = AcpiUtCreateMutex (i);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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}
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/* Create the spinlocks for use at interrupt level */
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Status = AcpiOsCreateLock (&AcpiGbl_GpeLock);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/* Mutex for _OSI support */
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Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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/* Create the reader/writer lock for namespace access */
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Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
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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: AcpiUtMutexTerminate
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*
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* PARAMETERS: None.
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*
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* RETURN: None.
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*
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* DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
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* spin locks, and reader/writer locks.
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*
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******************************************************************************/
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void
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AcpiUtMutexTerminate (
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void)
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{
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UINT32 i;
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ACPI_FUNCTION_TRACE (UtMutexTerminate);
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/* Delete each predefined mutex object */
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for (i = 0; i < ACPI_NUM_MUTEX; i++)
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{
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AcpiUtDeleteMutex (i);
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}
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AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
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/* Delete the spinlocks */
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AcpiOsDeleteLock (AcpiGbl_GpeLock);
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AcpiOsDeleteLock (AcpiGbl_HardwareLock);
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/* Delete the reader/writer lock */
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AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtCreateMutex
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*
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* PARAMETERS: MutexID - ID of the mutex to be created
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a mutex object.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiUtCreateMutex (
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ACPI_MUTEX_HANDLE MutexId)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
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if (!AcpiGbl_MutexInfo[MutexId].Mutex)
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{
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Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
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AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
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AcpiGbl_MutexInfo[MutexId].UseCount = 0;
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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: AcpiUtDeleteMutex
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*
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* PARAMETERS: MutexID - ID of the mutex to be deleted
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*
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* RETURN: Status
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*
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* DESCRIPTION: Delete a mutex object.
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*
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******************************************************************************/
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static void
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AcpiUtDeleteMutex (
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ACPI_MUTEX_HANDLE MutexId)
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{
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ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
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AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
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AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
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AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtAcquireMutex
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*
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* PARAMETERS: MutexID - ID of the mutex to be acquired
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*
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* RETURN: Status
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*
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* DESCRIPTION: Acquire a mutex object.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtAcquireMutex (
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ACPI_MUTEX_HANDLE MutexId)
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{
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ACPI_STATUS Status;
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ACPI_THREAD_ID ThisThreadId;
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ACPI_FUNCTION_NAME (UtAcquireMutex);
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if (MutexId > ACPI_MAX_MUTEX)
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{
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return (AE_BAD_PARAMETER);
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}
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ThisThreadId = AcpiOsGetThreadId ();
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#ifdef ACPI_MUTEX_DEBUG
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{
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UINT32 i;
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/*
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* Mutex debug code, for internal debugging only.
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*
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* Deadlock prevention. Check if this thread owns any mutexes of value
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* greater than or equal to this one. If so, the thread has violated
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* the mutex ordering rule. This indicates a coding error somewhere in
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* the ACPI subsystem code.
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*/
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for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
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{
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if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
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{
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if (i == MutexId)
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{
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ACPI_ERROR ((AE_INFO,
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"Mutex [%s] already acquired by this thread [%u]",
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AcpiUtGetMutexName (MutexId),
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(UINT32) ThisThreadId));
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return (AE_ALREADY_ACQUIRED);
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}
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ACPI_ERROR ((AE_INFO,
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"Invalid acquire order: Thread %u owns [%s], wants [%s]",
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(UINT32) ThisThreadId, AcpiUtGetMutexName (i),
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AcpiUtGetMutexName (MutexId)));
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return (AE_ACQUIRE_DEADLOCK);
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}
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}
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}
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#endif
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ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
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"Thread %u attempting to acquire Mutex [%s]\n",
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(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
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Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
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ACPI_WAIT_FOREVER);
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if (ACPI_SUCCESS (Status))
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
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(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
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AcpiGbl_MutexInfo[MutexId].UseCount++;
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AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
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}
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else
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{
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ACPI_EXCEPTION ((AE_INFO, Status,
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"Thread %u could not acquire Mutex [0x%X]",
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(UINT32) ThisThreadId, MutexId));
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}
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtReleaseMutex
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*
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* PARAMETERS: MutexID - ID of the mutex to be released
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release a mutex object.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtReleaseMutex (
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ACPI_MUTEX_HANDLE MutexId)
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{
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ACPI_FUNCTION_NAME (UtReleaseMutex);
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ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
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(UINT32) AcpiOsGetThreadId (), AcpiUtGetMutexName (MutexId)));
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if (MutexId > ACPI_MAX_MUTEX)
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{
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return (AE_BAD_PARAMETER);
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}
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/*
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* Mutex must be acquired in order to release it!
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*/
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if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
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{
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ACPI_ERROR ((AE_INFO,
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"Mutex [0x%X] is not acquired, cannot release", MutexId));
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return (AE_NOT_ACQUIRED);
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}
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#ifdef ACPI_MUTEX_DEBUG
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{
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UINT32 i;
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/*
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* Mutex debug code, for internal debugging only.
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*
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* Deadlock prevention. Check if this thread owns any mutexes of value
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* greater than this one. If so, the thread has violated the mutex
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* ordering rule. This indicates a coding error somewhere in
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* the ACPI subsystem code.
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*/
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for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
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{
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if (AcpiGbl_MutexInfo[i].ThreadId == AcpiOsGetThreadId ())
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{
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if (i == MutexId)
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{
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continue;
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}
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ACPI_ERROR ((AE_INFO,
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"Invalid release order: owns [%s], releasing [%s]",
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AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
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return (AE_RELEASE_DEADLOCK);
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}
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}
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}
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#endif
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/* Mark unlocked FIRST */
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AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
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AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
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return (AE_OK);
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}
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