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/*******************************************************************************
*
* Module Name: utmutex - local mutex support
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2011, 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.
*/
#define __UTMUTEX_C__
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME ("utmutex")
/* Local prototypes */
static ACPI_STATUS
AcpiUtCreateMutex (
ACPI_MUTEX_HANDLE MutexId);
static void
AcpiUtDeleteMutex (
ACPI_MUTEX_HANDLE MutexId);
/*******************************************************************************
*
* FUNCTION: AcpiUtMutexInitialize
*
* PARAMETERS: None.
*
* RETURN: Status
*
* DESCRIPTION: Create the system mutex objects. This includes mutexes,
* spin locks, and reader/writer locks.
*
******************************************************************************/
ACPI_STATUS
AcpiUtMutexInitialize (
void)
{
UINT32 i;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (UtMutexInitialize);
/* Create each of the predefined mutex objects */
for (i = 0; i < ACPI_NUM_MUTEX; i++)
{
Status = AcpiUtCreateMutex (i);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Create the spinlocks for use at interrupt level */
Status = AcpiOsCreateLock (&AcpiGbl_GpeLock);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Mutex for _OSI support */
Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Create the reader/writer lock for namespace access */
Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtMutexTerminate
*
* PARAMETERS: None.
*
* RETURN: None.
*
* DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
* spin locks, and reader/writer locks.
*
******************************************************************************/
void
AcpiUtMutexTerminate (
void)
{
UINT32 i;
ACPI_FUNCTION_TRACE (UtMutexTerminate);
/* Delete each predefined mutex object */
for (i = 0; i < ACPI_NUM_MUTEX; i++)
{
AcpiUtDeleteMutex (i);
}
AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
/* Delete the spinlocks */
AcpiOsDeleteLock (AcpiGbl_GpeLock);
AcpiOsDeleteLock (AcpiGbl_HardwareLock);
/* Delete the reader/writer lock */
AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiUtCreateMutex
*
* PARAMETERS: MutexID - ID of the mutex to be created
*
* RETURN: Status
*
* DESCRIPTION: Create a mutex object.
*
******************************************************************************/
static ACPI_STATUS
AcpiUtCreateMutex (
ACPI_MUTEX_HANDLE MutexId)
{
ACPI_STATUS Status = AE_OK;
ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
if (!AcpiGbl_MutexInfo[MutexId].Mutex)
{
Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
AcpiGbl_MutexInfo[MutexId].UseCount = 0;
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtDeleteMutex
*
* PARAMETERS: MutexID - ID of the mutex to be deleted
*
* RETURN: Status
*
* DESCRIPTION: Delete a mutex object.
*
******************************************************************************/
static void
AcpiUtDeleteMutex (
ACPI_MUTEX_HANDLE MutexId)
{
ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
}
/*******************************************************************************
*
* FUNCTION: AcpiUtAcquireMutex
*
* PARAMETERS: MutexID - ID of the mutex to be acquired
*
* RETURN: Status
*
* DESCRIPTION: Acquire a mutex object.
*
******************************************************************************/
ACPI_STATUS
AcpiUtAcquireMutex (
ACPI_MUTEX_HANDLE MutexId)
{
ACPI_STATUS Status;
ACPI_THREAD_ID ThisThreadId;
ACPI_FUNCTION_NAME (UtAcquireMutex);
if (MutexId > ACPI_MAX_MUTEX)
{
return (AE_BAD_PARAMETER);
}
ThisThreadId = AcpiOsGetThreadId ();
#ifdef ACPI_MUTEX_DEBUG
{
UINT32 i;
/*
* Mutex debug code, for internal debugging only.
*
* Deadlock prevention. Check if this thread owns any mutexes of value
* greater than or equal to this one. If so, the thread has violated
* the mutex ordering rule. This indicates a coding error somewhere in
* the ACPI subsystem code.
*/
for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
{
if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
{
if (i == MutexId)
{
ACPI_ERROR ((AE_INFO,
"Mutex [%s] already acquired by this thread [%u]",
AcpiUtGetMutexName (MutexId),
(UINT32) ThisThreadId));
return (AE_ALREADY_ACQUIRED);
}
ACPI_ERROR ((AE_INFO,
"Invalid acquire order: Thread %u owns [%s], wants [%s]",
(UINT32) ThisThreadId, AcpiUtGetMutexName (i),
AcpiUtGetMutexName (MutexId)));
return (AE_ACQUIRE_DEADLOCK);
}
}
}
#endif
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
"Thread %u attempting to acquire Mutex [%s]\n",
(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
ACPI_WAIT_FOREVER);
if (ACPI_SUCCESS (Status))
{
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
AcpiGbl_MutexInfo[MutexId].UseCount++;
AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
}
else
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Thread %u could not acquire Mutex [0x%X]",
(UINT32) ThisThreadId, MutexId));
}
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtReleaseMutex
*
* PARAMETERS: MutexID - ID of the mutex to be released
*
* RETURN: Status
*
* DESCRIPTION: Release a mutex object.
*
******************************************************************************/
ACPI_STATUS
AcpiUtReleaseMutex (
ACPI_MUTEX_HANDLE MutexId)
{
ACPI_THREAD_ID ThisThreadId;
ACPI_FUNCTION_NAME (UtReleaseMutex);
ThisThreadId = AcpiOsGetThreadId ();
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
(UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
if (MutexId > ACPI_MAX_MUTEX)
{
return (AE_BAD_PARAMETER);
}
/*
* Mutex must be acquired in order to release it!
*/
if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
{
ACPI_ERROR ((AE_INFO,
"Mutex [0x%X] is not acquired, cannot release", MutexId));
return (AE_NOT_ACQUIRED);
}
#ifdef ACPI_MUTEX_DEBUG
{
UINT32 i;
/*
* Mutex debug code, for internal debugging only.
*
* Deadlock prevention. Check if this thread owns any mutexes of value
* greater than this one. If so, the thread has violated the mutex
* ordering rule. This indicates a coding error somewhere in
* the ACPI subsystem code.
*/
for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
{
if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
{
if (i == MutexId)
{
continue;
}
ACPI_ERROR ((AE_INFO,
"Invalid release order: owns [%s], releasing [%s]",
AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
return (AE_RELEASE_DEADLOCK);
}
}
}
#endif
/* Mark unlocked FIRST */
AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
return (AE_OK);
}