809 lines
23 KiB
C
809 lines
23 KiB
C
/*******************************************************************************
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*
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* Module Name: utdelete - object deletion and reference count utilities
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, 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 __UTDELETE_C__
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#include "acpi.h"
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#include "accommon.h"
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#include "acinterp.h"
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#include "acnamesp.h"
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#include "acevents.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME ("utdelete")
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/* Local prototypes */
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static void
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AcpiUtDeleteInternalObj (
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ACPI_OPERAND_OBJECT *Object);
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static void
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AcpiUtUpdateRefCount (
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ACPI_OPERAND_OBJECT *Object,
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UINT32 Action);
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtDeleteInternalObj
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*
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* PARAMETERS: Object - Object to be deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: Low level object deletion, after reference counts have been
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* updated (All reference counts, including sub-objects!)
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*
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******************************************************************************/
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static void
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AcpiUtDeleteInternalObj (
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ACPI_OPERAND_OBJECT *Object)
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{
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void *ObjPointer = NULL;
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ACPI_OPERAND_OBJECT *HandlerDesc;
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ACPI_OPERAND_OBJECT *SecondDesc;
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ACPI_OPERAND_OBJECT *NextDesc;
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ACPI_OPERAND_OBJECT *StartDesc;
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ACPI_OPERAND_OBJECT **LastObjPtr;
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ACPI_FUNCTION_TRACE_PTR (UtDeleteInternalObj, Object);
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if (!Object)
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{
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return_VOID;
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}
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/*
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* Must delete or free any pointers within the object that are not
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* actual ACPI objects (for example, a raw buffer pointer).
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*/
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switch (Object->Common.Type)
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{
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case ACPI_TYPE_STRING:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** String %p, ptr %p\n",
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Object, Object->String.Pointer));
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/* Free the actual string buffer */
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if (!(Object->Common.Flags & AOPOBJ_STATIC_POINTER))
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{
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/* But only if it is NOT a pointer into an ACPI table */
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ObjPointer = Object->String.Pointer;
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}
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break;
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case ACPI_TYPE_BUFFER:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** Buffer %p, ptr %p\n",
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Object, Object->Buffer.Pointer));
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/* Free the actual buffer */
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if (!(Object->Common.Flags & AOPOBJ_STATIC_POINTER))
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{
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/* But only if it is NOT a pointer into an ACPI table */
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ObjPointer = Object->Buffer.Pointer;
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}
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break;
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case ACPI_TYPE_PACKAGE:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, " **** Package of count %X\n",
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Object->Package.Count));
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/*
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* Elements of the package are not handled here, they are deleted
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* separately
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*/
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/* Free the (variable length) element pointer array */
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ObjPointer = Object->Package.Elements;
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break;
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/*
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* These objects have a possible list of notify handlers.
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* Device object also may have a GPE block.
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*/
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case ACPI_TYPE_DEVICE:
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if (Object->Device.GpeBlock)
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{
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(void) AcpiEvDeleteGpeBlock (Object->Device.GpeBlock);
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}
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/*lint -fallthrough */
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case ACPI_TYPE_PROCESSOR:
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case ACPI_TYPE_THERMAL:
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/* Walk the address handler list for this object */
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HandlerDesc = Object->CommonNotify.Handler;
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while (HandlerDesc)
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{
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NextDesc = HandlerDesc->AddressSpace.Next;
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AcpiUtRemoveReference (HandlerDesc);
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HandlerDesc = NextDesc;
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}
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break;
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case ACPI_TYPE_MUTEX:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"***** Mutex %p, OS Mutex %p\n",
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Object, Object->Mutex.OsMutex));
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if (Object == AcpiGbl_GlobalLockMutex)
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{
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/* Global Lock has extra semaphore */
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(void) AcpiOsDeleteSemaphore (AcpiGbl_GlobalLockSemaphore);
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AcpiGbl_GlobalLockSemaphore = NULL;
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AcpiOsDeleteMutex (Object->Mutex.OsMutex);
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AcpiGbl_GlobalLockMutex = NULL;
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}
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else
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{
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AcpiExUnlinkMutex (Object);
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AcpiOsDeleteMutex (Object->Mutex.OsMutex);
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}
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break;
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case ACPI_TYPE_EVENT:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"***** Event %p, OS Semaphore %p\n",
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Object, Object->Event.OsSemaphore));
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(void) AcpiOsDeleteSemaphore (Object->Event.OsSemaphore);
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Object->Event.OsSemaphore = NULL;
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break;
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case ACPI_TYPE_METHOD:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"***** Method %p\n", Object));
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/* Delete the method mutex if it exists */
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if (Object->Method.Mutex)
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{
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AcpiOsDeleteMutex (Object->Method.Mutex->Mutex.OsMutex);
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AcpiUtDeleteObjectDesc (Object->Method.Mutex);
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Object->Method.Mutex = NULL;
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}
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break;
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case ACPI_TYPE_REGION:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"***** Region %p\n", Object));
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/*
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* Update AddressRange list. However, only permanent regions
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* are installed in this list. (Not created within a method)
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*/
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if (!(Object->Region.Node->Flags & ANOBJ_TEMPORARY))
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{
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AcpiUtRemoveAddressRange (Object->Region.SpaceId,
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Object->Region.Node);
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}
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SecondDesc = AcpiNsGetSecondaryObject (Object);
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if (SecondDesc)
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{
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/*
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* Free the RegionContext if and only if the handler is one of the
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* default handlers -- and therefore, we created the context object
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* locally, it was not created by an external caller.
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*/
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HandlerDesc = Object->Region.Handler;
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if (HandlerDesc)
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{
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NextDesc = HandlerDesc->AddressSpace.RegionList;
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StartDesc = NextDesc;
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LastObjPtr = &HandlerDesc->AddressSpace.RegionList;
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/* Remove the region object from the handler list */
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while (NextDesc)
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{
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if (NextDesc == Object)
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{
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*LastObjPtr = NextDesc->Region.Next;
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break;
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}
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/* Walk the linked list of handlers */
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LastObjPtr = &NextDesc->Region.Next;
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NextDesc = NextDesc->Region.Next;
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/* Prevent infinite loop if list is corrupted */
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if (NextDesc == StartDesc)
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{
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ACPI_ERROR ((AE_INFO,
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"Circular region list in address handler object %p",
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HandlerDesc));
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return_VOID;
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}
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}
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if (HandlerDesc->AddressSpace.HandlerFlags &
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ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)
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{
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/* Deactivate region and free region context */
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if (HandlerDesc->AddressSpace.Setup)
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{
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(void) HandlerDesc->AddressSpace.Setup (Object,
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ACPI_REGION_DEACTIVATE,
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HandlerDesc->AddressSpace.Context,
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&SecondDesc->Extra.RegionContext);
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}
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}
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AcpiUtRemoveReference (HandlerDesc);
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}
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/* Now we can free the Extra object */
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AcpiUtDeleteObjectDesc (SecondDesc);
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}
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break;
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case ACPI_TYPE_BUFFER_FIELD:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"***** Buffer Field %p\n", Object));
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SecondDesc = AcpiNsGetSecondaryObject (Object);
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if (SecondDesc)
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{
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AcpiUtDeleteObjectDesc (SecondDesc);
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}
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break;
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case ACPI_TYPE_LOCAL_BANK_FIELD:
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"***** Bank Field %p\n", Object));
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SecondDesc = AcpiNsGetSecondaryObject (Object);
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if (SecondDesc)
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{
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AcpiUtDeleteObjectDesc (SecondDesc);
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}
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break;
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default:
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break;
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}
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/* Free any allocated memory (pointer within the object) found above */
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if (ObjPointer)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object Subptr %p\n",
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ObjPointer));
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ACPI_FREE (ObjPointer);
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}
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/* Now the object can be safely deleted */
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
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Object, AcpiUtGetObjectTypeName (Object)));
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AcpiUtDeleteObjectDesc (Object);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtDeleteInternalObjectList
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*
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* PARAMETERS: ObjList - Pointer to the list to be deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: This function deletes an internal object list, including both
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* simple objects and package objects
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*
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******************************************************************************/
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void
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AcpiUtDeleteInternalObjectList (
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ACPI_OPERAND_OBJECT **ObjList)
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{
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ACPI_OPERAND_OBJECT **InternalObj;
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ACPI_FUNCTION_ENTRY ();
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/* Walk the null-terminated internal list */
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for (InternalObj = ObjList; *InternalObj; InternalObj++)
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{
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AcpiUtRemoveReference (*InternalObj);
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}
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/* Free the combined parameter pointer list and object array */
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ACPI_FREE (ObjList);
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return;
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtUpdateRefCount
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*
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* PARAMETERS: Object - Object whose ref count is to be updated
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* Action - What to do (REF_INCREMENT or REF_DECREMENT)
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*
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* RETURN: None. Sets new reference count within the object
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*
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* DESCRIPTION: Modify the reference count for an internal acpi object
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*
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******************************************************************************/
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static void
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AcpiUtUpdateRefCount (
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ACPI_OPERAND_OBJECT *Object,
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UINT32 Action)
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{
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UINT16 OriginalCount;
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UINT16 NewCount = 0;
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ACPI_CPU_FLAGS LockFlags;
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ACPI_FUNCTION_NAME (UtUpdateRefCount);
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if (!Object)
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{
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return;
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}
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/*
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* Always get the reference count lock. Note: Interpreter and/or
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* Namespace is not always locked when this function is called.
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*/
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LockFlags = AcpiOsAcquireLock (AcpiGbl_ReferenceCountLock);
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OriginalCount = Object->Common.ReferenceCount;
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/* Perform the reference count action (increment, decrement) */
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switch (Action)
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{
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case REF_INCREMENT:
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NewCount = OriginalCount + 1;
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Object->Common.ReferenceCount = NewCount;
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AcpiOsReleaseLock (AcpiGbl_ReferenceCountLock, LockFlags);
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/* The current reference count should never be zero here */
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if (!OriginalCount)
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{
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ACPI_WARNING ((AE_INFO,
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"Obj %p, Reference Count was zero before increment\n",
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Object));
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"Obj %p Type %.2X Refs %.2X [Incremented]\n",
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Object, Object->Common.Type, NewCount));
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break;
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case REF_DECREMENT:
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/* The current reference count must be non-zero */
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if (OriginalCount)
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{
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NewCount = OriginalCount - 1;
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Object->Common.ReferenceCount = NewCount;
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}
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AcpiOsReleaseLock (AcpiGbl_ReferenceCountLock, LockFlags);
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if (!OriginalCount)
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{
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ACPI_WARNING ((AE_INFO,
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"Obj %p, Reference Count is already zero, cannot decrement\n",
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Object));
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"Obj %p Type %.2X Refs %.2X [Decremented]\n",
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Object, Object->Common.Type, NewCount));
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/* Actually delete the object on a reference count of zero */
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if (NewCount == 0)
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{
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AcpiUtDeleteInternalObj (Object);
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}
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break;
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default:
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AcpiOsReleaseLock (AcpiGbl_ReferenceCountLock, LockFlags);
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ACPI_ERROR ((AE_INFO, "Unknown Reference Count action (0x%X)",
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Action));
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return;
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}
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/*
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* Sanity check the reference count, for debug purposes only.
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* (A deleted object will have a huge reference count)
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*/
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if (NewCount > ACPI_MAX_REFERENCE_COUNT)
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{
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ACPI_WARNING ((AE_INFO,
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"Large Reference Count (0x%X) in object %p, Type=0x%.2X",
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NewCount, Object, Object->Common.Type));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiUtUpdateObjectReference
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*
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* PARAMETERS: Object - Increment ref count for this object
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* and all sub-objects
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* Action - Either REF_INCREMENT or REF_DECREMENT
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*
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* RETURN: Status
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*
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* DESCRIPTION: Increment the object reference count
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*
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* Object references are incremented when:
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* 1) An object is attached to a Node (namespace object)
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* 2) An object is copied (all subobjects must be incremented)
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*
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* Object references are decremented when:
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* 1) An object is detached from an Node
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiUtUpdateObjectReference (
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ACPI_OPERAND_OBJECT *Object,
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UINT16 Action)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_GENERIC_STATE *StateList = NULL;
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ACPI_OPERAND_OBJECT *NextObject = NULL;
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ACPI_OPERAND_OBJECT *PrevObject;
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ACPI_GENERIC_STATE *State;
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UINT32 i;
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ACPI_FUNCTION_NAME (UtUpdateObjectReference);
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while (Object)
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{
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/* Make sure that this isn't a namespace handle */
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if (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
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"Object %p is NS handle\n", Object));
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return (AE_OK);
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}
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/*
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* All sub-objects must have their reference count incremented also.
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* Different object types have different subobjects.
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*/
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switch (Object->Common.Type)
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{
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case ACPI_TYPE_DEVICE:
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case ACPI_TYPE_PROCESSOR:
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case ACPI_TYPE_POWER:
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case ACPI_TYPE_THERMAL:
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/*
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* Update the notify objects for these types (if present)
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* Two lists, system and device notify handlers.
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*/
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for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++)
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{
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PrevObject = Object->CommonNotify.NotifyList[i];
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while (PrevObject)
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{
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NextObject = PrevObject->Notify.Next[i];
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AcpiUtUpdateRefCount (PrevObject, Action);
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PrevObject = NextObject;
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}
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}
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break;
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case ACPI_TYPE_PACKAGE:
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/*
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* We must update all the sub-objects of the package,
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* each of whom may have their own sub-objects.
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*/
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for (i = 0; i < Object->Package.Count; i++)
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{
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/*
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* Null package elements are legal and can be simply
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* ignored.
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*/
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NextObject = Object->Package.Elements[i];
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if (!NextObject)
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{
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continue;
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}
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switch (NextObject->Common.Type)
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{
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case ACPI_TYPE_INTEGER:
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case ACPI_TYPE_STRING:
|
|
case ACPI_TYPE_BUFFER:
|
|
/*
|
|
* For these very simple sub-objects, we can just
|
|
* update the reference count here and continue.
|
|
* Greatly increases performance of this operation.
|
|
*/
|
|
AcpiUtUpdateRefCount (NextObject, Action);
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* For complex sub-objects, push them onto the stack
|
|
* for later processing (this eliminates recursion.)
|
|
*/
|
|
Status = AcpiUtCreateUpdateStateAndPush (
|
|
NextObject, Action, &StateList);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
goto ErrorExit;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
NextObject = NULL;
|
|
break;
|
|
|
|
case ACPI_TYPE_BUFFER_FIELD:
|
|
|
|
NextObject = Object->BufferField.BufferObj;
|
|
break;
|
|
|
|
case ACPI_TYPE_LOCAL_REGION_FIELD:
|
|
|
|
NextObject = Object->Field.RegionObj;
|
|
break;
|
|
|
|
case ACPI_TYPE_LOCAL_BANK_FIELD:
|
|
|
|
NextObject = Object->BankField.BankObj;
|
|
Status = AcpiUtCreateUpdateStateAndPush (
|
|
Object->BankField.RegionObj, Action, &StateList);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
goto ErrorExit;
|
|
}
|
|
break;
|
|
|
|
case ACPI_TYPE_LOCAL_INDEX_FIELD:
|
|
|
|
NextObject = Object->IndexField.IndexObj;
|
|
Status = AcpiUtCreateUpdateStateAndPush (
|
|
Object->IndexField.DataObj, Action, &StateList);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
goto ErrorExit;
|
|
}
|
|
break;
|
|
|
|
case ACPI_TYPE_LOCAL_REFERENCE:
|
|
/*
|
|
* The target of an Index (a package, string, or buffer) or a named
|
|
* reference must track changes to the ref count of the index or
|
|
* target object.
|
|
*/
|
|
if ((Object->Reference.Class == ACPI_REFCLASS_INDEX) ||
|
|
(Object->Reference.Class== ACPI_REFCLASS_NAME))
|
|
{
|
|
NextObject = Object->Reference.Object;
|
|
}
|
|
break;
|
|
|
|
case ACPI_TYPE_REGION:
|
|
default:
|
|
|
|
break; /* No subobjects for all other types */
|
|
}
|
|
|
|
/*
|
|
* Now we can update the count in the main object. This can only
|
|
* happen after we update the sub-objects in case this causes the
|
|
* main object to be deleted.
|
|
*/
|
|
AcpiUtUpdateRefCount (Object, Action);
|
|
Object = NULL;
|
|
|
|
/* Move on to the next object to be updated */
|
|
|
|
if (NextObject)
|
|
{
|
|
Object = NextObject;
|
|
NextObject = NULL;
|
|
}
|
|
else if (StateList)
|
|
{
|
|
State = AcpiUtPopGenericState (&StateList);
|
|
Object = State->Update.Object;
|
|
AcpiUtDeleteGenericState (State);
|
|
}
|
|
}
|
|
|
|
return (AE_OK);
|
|
|
|
|
|
ErrorExit:
|
|
|
|
ACPI_EXCEPTION ((AE_INFO, Status,
|
|
"Could not update object reference count"));
|
|
|
|
/* Free any stacked Update State objects */
|
|
|
|
while (StateList)
|
|
{
|
|
State = AcpiUtPopGenericState (&StateList);
|
|
AcpiUtDeleteGenericState (State);
|
|
}
|
|
|
|
return (Status);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiUtAddReference
|
|
*
|
|
* PARAMETERS: Object - Object whose reference count is to be
|
|
* incremented
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Add one reference to an ACPI object
|
|
*
|
|
******************************************************************************/
|
|
|
|
void
|
|
AcpiUtAddReference (
|
|
ACPI_OPERAND_OBJECT *Object)
|
|
{
|
|
|
|
ACPI_FUNCTION_NAME (UtAddReference);
|
|
|
|
|
|
/* Ensure that we have a valid object */
|
|
|
|
if (!AcpiUtValidInternalObject (Object))
|
|
{
|
|
return;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
|
|
"Obj %p Current Refs=%X [To Be Incremented]\n",
|
|
Object, Object->Common.ReferenceCount));
|
|
|
|
/* Increment the reference count */
|
|
|
|
(void) AcpiUtUpdateObjectReference (Object, REF_INCREMENT);
|
|
return;
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiUtRemoveReference
|
|
*
|
|
* PARAMETERS: Object - Object whose ref count will be decremented
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Decrement the reference count of an ACPI internal object
|
|
*
|
|
******************************************************************************/
|
|
|
|
void
|
|
AcpiUtRemoveReference (
|
|
ACPI_OPERAND_OBJECT *Object)
|
|
{
|
|
|
|
ACPI_FUNCTION_NAME (UtRemoveReference);
|
|
|
|
|
|
/*
|
|
* Allow a NULL pointer to be passed in, just ignore it. This saves
|
|
* each caller from having to check. Also, ignore NS nodes.
|
|
*/
|
|
if (!Object ||
|
|
(ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED))
|
|
|
|
{
|
|
return;
|
|
}
|
|
|
|
/* Ensure that we have a valid object */
|
|
|
|
if (!AcpiUtValidInternalObject (Object))
|
|
{
|
|
return;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
|
|
"Obj %p Current Refs=%X [To Be Decremented]\n",
|
|
Object, Object->Common.ReferenceCount));
|
|
|
|
/*
|
|
* Decrement the reference count, and only actually delete the object
|
|
* if the reference count becomes 0. (Must also decrement the ref count
|
|
* of all subobjects!)
|
|
*/
|
|
(void) AcpiUtUpdateObjectReference (Object, REF_DECREMENT);
|
|
return;
|
|
}
|