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minix3/drivers/power/acpi/executer/exmutex.c

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/******************************************************************************
*
* 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;
}
}
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