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382 lines
12 KiB
C
382 lines
12 KiB
C
/******************************************************************************
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*
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* Module Name: nswalk - Functions for walking the ACPI namespace
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2019, 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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#include "acpi.h"
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#include "accommon.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nswalk")
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsGetNextNode
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*
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* PARAMETERS: ParentNode - Parent node whose children we are
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* getting
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* ChildNode - Previous child that was found.
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* The NEXT child will be returned
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*
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* RETURN: ACPI_NAMESPACE_NODE - Pointer to the NEXT child or NULL if
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* none is found.
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*
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* DESCRIPTION: Return the next peer node within the namespace. If Handle
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* is valid, Scope is ignored. Otherwise, the first node
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* within Scope is returned.
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*
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******************************************************************************/
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ACPI_NAMESPACE_NODE *
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AcpiNsGetNextNode (
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ACPI_NAMESPACE_NODE *ParentNode,
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ACPI_NAMESPACE_NODE *ChildNode)
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{
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ACPI_FUNCTION_ENTRY ();
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if (!ChildNode)
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{
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/* It's really the parent's _scope_ that we want */
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return (ParentNode->Child);
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}
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/* Otherwise just return the next peer */
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return (ChildNode->Peer);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsGetNextNodeTyped
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*
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* PARAMETERS: Type - Type of node to be searched for
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* ParentNode - Parent node whose children we are
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* getting
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* ChildNode - Previous child that was found.
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* The NEXT child will be returned
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*
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* RETURN: ACPI_NAMESPACE_NODE - Pointer to the NEXT child or NULL if
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* none is found.
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*
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* DESCRIPTION: Return the next peer node within the namespace. If Handle
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* is valid, Scope is ignored. Otherwise, the first node
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* within Scope is returned.
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*
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******************************************************************************/
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ACPI_NAMESPACE_NODE *
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AcpiNsGetNextNodeTyped (
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ACPI_OBJECT_TYPE Type,
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ACPI_NAMESPACE_NODE *ParentNode,
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ACPI_NAMESPACE_NODE *ChildNode)
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{
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ACPI_NAMESPACE_NODE *NextNode = NULL;
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ACPI_FUNCTION_ENTRY ();
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NextNode = AcpiNsGetNextNode (ParentNode, ChildNode);
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/* If any type is OK, we are done */
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if (Type == ACPI_TYPE_ANY)
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{
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/* NextNode is NULL if we are at the end-of-list */
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return (NextNode);
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}
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/* Must search for the node -- but within this scope only */
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while (NextNode)
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{
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/* If type matches, we are done */
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if (NextNode->Type == Type)
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{
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return (NextNode);
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}
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/* Otherwise, move on to the next peer node */
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NextNode = NextNode->Peer;
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}
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/* Not found */
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return (NULL);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsWalkNamespace
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*
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* PARAMETERS: Type - ACPI_OBJECT_TYPE to search for
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* StartNode - Handle in namespace where search begins
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* MaxDepth - Depth to which search is to reach
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* Flags - Whether to unlock the NS before invoking
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* the callback routine
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* DescendingCallback - Called during tree descent
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* when an object of "Type" is found
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* AscendingCallback - Called during tree ascent
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* when an object of "Type" is found
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* Context - Passed to user function(s) above
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* ReturnValue - from the UserFunction if terminated
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* early. Otherwise, returns NULL.
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* RETURNS: Status
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*
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* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
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* starting (and ending) at the node specified by StartHandle.
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* The callback function is called whenever a node that matches
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* the type parameter is found. If the callback function returns
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* a non-zero value, the search is terminated immediately and
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* this value is returned to the caller.
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*
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* The point of this procedure is to provide a generic namespace
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* walk routine that can be called from multiple places to
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* provide multiple services; the callback function(s) can be
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* tailored to each task, whether it is a print function,
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* a compare function, etc.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsWalkNamespace (
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ACPI_OBJECT_TYPE Type,
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ACPI_HANDLE StartNode,
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UINT32 MaxDepth,
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UINT32 Flags,
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ACPI_WALK_CALLBACK DescendingCallback,
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ACPI_WALK_CALLBACK AscendingCallback,
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void *Context,
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void **ReturnValue)
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{
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ACPI_STATUS Status;
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ACPI_STATUS MutexStatus;
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ACPI_NAMESPACE_NODE *ChildNode;
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ACPI_NAMESPACE_NODE *ParentNode;
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ACPI_OBJECT_TYPE ChildType;
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UINT32 Level;
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BOOLEAN NodePreviouslyVisited = FALSE;
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ACPI_FUNCTION_TRACE (NsWalkNamespace);
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/* Special case for the namespace Root Node */
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if (StartNode == ACPI_ROOT_OBJECT)
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{
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StartNode = AcpiGbl_RootNode;
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}
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/* Null child means "get first node" */
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ParentNode = StartNode;
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ChildNode = AcpiNsGetNextNode (ParentNode, NULL);
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ChildType = ACPI_TYPE_ANY;
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Level = 1;
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/*
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* Traverse the tree of nodes until we bubble back up to where we
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* started. When Level is zero, the loop is done because we have
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* bubbled up to (and passed) the original parent handle (StartEntry)
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*/
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while (Level > 0 && ChildNode)
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{
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Status = AE_OK;
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/* Found next child, get the type if we are not searching for ANY */
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if (Type != ACPI_TYPE_ANY)
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{
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ChildType = ChildNode->Type;
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}
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/*
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* Ignore all temporary namespace nodes (created during control
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* method execution) unless told otherwise. These temporary nodes
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* can cause a race condition because they can be deleted during
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* the execution of the user function (if the namespace is
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* unlocked before invocation of the user function.) Only the
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* debugger namespace dump will examine the temporary nodes.
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*/
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if ((ChildNode->Flags & ANOBJ_TEMPORARY) &&
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!(Flags & ACPI_NS_WALK_TEMP_NODES))
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{
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Status = AE_CTRL_DEPTH;
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}
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/* Type must match requested type */
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else if (ChildType == Type)
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{
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/*
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* Found a matching node, invoke the user callback function.
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* Unlock the namespace if flag is set.
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*/
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if (Flags & ACPI_NS_WALK_UNLOCK)
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{
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MutexStatus = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (MutexStatus))
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{
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return_ACPI_STATUS (MutexStatus);
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}
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}
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/*
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* Invoke the user function, either descending, ascending,
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* or both.
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*/
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if (!NodePreviouslyVisited)
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{
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if (DescendingCallback)
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{
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Status = DescendingCallback (ChildNode, Level,
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Context, ReturnValue);
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}
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}
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else
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{
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if (AscendingCallback)
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{
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Status = AscendingCallback (ChildNode, Level,
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Context, ReturnValue);
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}
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}
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if (Flags & ACPI_NS_WALK_UNLOCK)
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{
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MutexStatus = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (MutexStatus))
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{
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return_ACPI_STATUS (MutexStatus);
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}
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}
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switch (Status)
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{
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case AE_OK:
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case AE_CTRL_DEPTH:
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/* Just keep going */
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break;
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case AE_CTRL_TERMINATE:
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/* Exit now, with OK status */
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return_ACPI_STATUS (AE_OK);
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default:
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/* All others are valid exceptions */
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return_ACPI_STATUS (Status);
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}
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}
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/*
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* Depth first search: Attempt to go down another level in the
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* namespace if we are allowed to. Don't go any further if we have
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* reached the caller specified maximum depth or if the user
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* function has specified that the maximum depth has been reached.
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*/
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if (!NodePreviouslyVisited &&
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(Level < MaxDepth) &&
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(Status != AE_CTRL_DEPTH))
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{
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if (ChildNode->Child)
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{
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/* There is at least one child of this node, visit it */
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Level++;
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ParentNode = ChildNode;
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ChildNode = AcpiNsGetNextNode (ParentNode, NULL);
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continue;
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}
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}
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/* No more children, re-visit this node */
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if (!NodePreviouslyVisited)
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{
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NodePreviouslyVisited = TRUE;
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continue;
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}
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/* No more children, visit peers */
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ChildNode = AcpiNsGetNextNode (ParentNode, ChildNode);
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if (ChildNode)
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{
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NodePreviouslyVisited = FALSE;
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}
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/* No peers, re-visit parent */
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else
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{
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/*
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* No more children of this node (AcpiNsGetNextNode failed), go
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* back upwards in the namespace tree to the node's parent.
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*/
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Level--;
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ChildNode = ParentNode;
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ParentNode = ParentNode->Parent;
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NodePreviouslyVisited = TRUE;
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}
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}
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/* Complete walk, not terminated by user function */
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return_ACPI_STATUS (AE_OK);
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}
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