/******************************************************************************
*
* Module Name: exmutex - ASL Mutex Acquire/Release functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2018, 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.
*/
#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);
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
"Depth %u TID %p\n",
ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
ObjDesc->Mutex.AcquisitionDepth, WalkState->Thread));
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);
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
ObjDesc->Mutex.AcquisitionDepth));
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_ACPI_STATUS (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)
{
UINT8 PreviousSyncLevel;
ACPI_THREAD_STATE *OwnerThread;
ACPI_STATUS Status = AE_OK;
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 %u cannot release Mutex [%4.4s] acquired by thread %u",
(UINT32) WalkState->Thread->ThreadId,
AcpiUtGetNodeName (ObjDesc->Mutex.Node),
(UINT32) 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;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
"Prev SyncLevel %u, Depth %u TID %p\n",
ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth,
WalkState->Thread));
Status = AcpiExReleaseMutexObject (ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (ObjDesc->Mutex.AcquisitionDepth == 0)
{
/* Restore the previous SyncLevel */
OwnerThread->CurrentSyncLevel = PreviousSyncLevel;
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Released: Object SyncLevel %u, Thread SyncLevel, %u, "
"Prev SyncLevel %u, Depth %u\n",
ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth));
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_TRACE (ExReleaseAllMutexes);
/* Traverse the list of owned mutexes, releasing each one */
while (Next)
{
ObjDesc = Next;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
ObjDesc->Mutex.Node->Name.Ascii, ObjDesc->Mutex.SyncLevel,
ObjDesc->Mutex.AcquisitionDepth));
/* Release the mutex, special case for Global Lock */
if (ObjDesc == AcpiGbl_GlobalLockMutex)
{
/* Ignore errors */
(void) AcpiEvReleaseGlobalLock ();
}
else
{
AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex);
}
/* Update Thread SyncLevel (Last mutex is the important one) */
Thread->CurrentSyncLevel = ObjDesc->Mutex.OriginalSyncLevel;
/* Mark mutex unowned */
Next = ObjDesc->Mutex.Next;
ObjDesc->Mutex.Prev = NULL;
ObjDesc->Mutex.Next = NULL;
ObjDesc->Mutex.AcquisitionDepth = 0;
ObjDesc->Mutex.OwnerThread = NULL;
ObjDesc->Mutex.ThreadId = 0;
}
return_VOID;
}