NetBSD-5.0.2/sys/dist/acpica/utmutex.c
/*******************************************************************************
*
* Module Name: utmutex - local mutex support
* $Revision: 1.5 $
*
******************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2008, 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 __UTMUTEX_C__
#include "acpi.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME ("utmutex")
/* Local prototypes */
static ACPI_STATUS
AcpiUtCreateMutex (
ACPI_MUTEX_HANDLE MutexId);
static ACPI_STATUS
AcpiUtDeleteMutex (
ACPI_MUTEX_HANDLE MutexId);
/*******************************************************************************
*
* FUNCTION: AcpiUtMutexInitialize
*
* PARAMETERS: None.
*
* RETURN: Status
*
* DESCRIPTION: Create the system mutex objects.
*
******************************************************************************/
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);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiUtMutexTerminate
*
* PARAMETERS: None.
*
* RETURN: None.
*
* DESCRIPTION: Delete all of the system mutex objects.
*
******************************************************************************/
void
AcpiUtMutexTerminate (
void)
{
UINT32 i;
ACPI_FUNCTION_TRACE (UtMutexTerminate);
/*
* Delete each predefined mutex object
*/
for (i = 0; i < ACPI_NUM_MUTEX; i++)
{
(void) AcpiUtDeleteMutex (i);
}
/* Delete the spinlocks */
AcpiOsDeleteLock (AcpiGbl_GpeLock);
AcpiOsDeleteLock (AcpiGbl_HardwareLock);
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 (MutexId > ACPI_MAX_MUTEX)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
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 ACPI_STATUS
AcpiUtDeleteMutex (
ACPI_MUTEX_HANDLE MutexId)
{
ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
if (MutexId > ACPI_MAX_MUTEX)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* 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_MAX_MUTEX; i++)
{
if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
{
if (i == MutexId)
{
ACPI_ERROR ((AE_INFO,
"Mutex [%s] already acquired by this thread [%X]",
AcpiUtGetMutexName (MutexId), ThisThreadId));
return (AE_ALREADY_ACQUIRED);
}
ACPI_ERROR ((AE_INFO,
"Invalid acquire order: Thread %X owns [%s], wants [%s]",
ThisThreadId, AcpiUtGetMutexName (i),
AcpiUtGetMutexName (MutexId)));
return (AE_ACQUIRE_DEADLOCK);
}
}
}
#endif
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
"Thread %lX attempting to acquire Mutex [%s]\n",
(unsigned long)ThisThreadId, AcpiUtGetMutexName (MutexId)));
Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
ACPI_WAIT_FOREVER);
if (ACPI_SUCCESS (Status))
{
ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %lX acquired Mutex [%s]\n",
(unsigned long)ThisThreadId, AcpiUtGetMutexName (MutexId)));
AcpiGbl_MutexInfo[MutexId].UseCount++;
AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
}
else
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Thread %lX could not acquire Mutex [%X]",
(unsigned long)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 %lX releasing Mutex [%s]\n", (unsigned long)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 [%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_MAX_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);
}