397 lines
12 KiB
C
397 lines
12 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/*******************************************************************************
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*
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* Module Name: nssearch - Namespace search
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*
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******************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#ifdef ACPI_ASL_COMPILER
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#include "amlcode.h"
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#endif
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nssearch")
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/* Local prototypes */
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static acpi_status
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acpi_ns_search_parent_tree(u32 target_name,
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struct acpi_namespace_node *node,
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acpi_object_type type,
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struct acpi_namespace_node **return_node);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_search_one_scope
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*
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* PARAMETERS: target_name - Ascii ACPI name to search for
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* parent_node - Starting node where search will begin
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* type - Object type to match
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* return_node - Where the matched Named obj is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Search a single level of the namespace. Performs a
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* simple search of the specified level, and does not add
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* entries or search parents.
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*
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*
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* Named object lists are built (and subsequently dumped) in the
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* order in which the names are encountered during the namespace load;
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*
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* All namespace searching is linear in this implementation, but
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* could be easily modified to support any improved search
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* algorithm. However, the linear search was chosen for simplicity
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* and because the trees are small and the other interpreter
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* execution overhead is relatively high.
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*
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* Note: CPU execution analysis has shown that the AML interpreter spends
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* a very small percentage of its time searching the namespace. Therefore,
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* the linear search seems to be sufficient, as there would seem to be
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* little value in improving the search.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_search_one_scope(u32 target_name,
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struct acpi_namespace_node *parent_node,
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acpi_object_type type,
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struct acpi_namespace_node **return_node)
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{
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struct acpi_namespace_node *node;
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ACPI_FUNCTION_TRACE(ns_search_one_scope);
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#ifdef ACPI_DEBUG_OUTPUT
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if (ACPI_LV_NAMES & acpi_dbg_level) {
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char *scope_name;
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scope_name = acpi_ns_get_normalized_pathname(parent_node, TRUE);
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if (scope_name) {
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Searching %s (%p) For [%4.4s] (%s)\n",
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scope_name, parent_node,
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ACPI_CAST_PTR(char, &target_name),
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acpi_ut_get_type_name(type)));
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ACPI_FREE(scope_name);
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}
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}
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#endif
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/*
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* Search for name at this namespace level, which is to say that we
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* must search for the name among the children of this object
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*/
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node = parent_node->child;
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while (node) {
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/* Check for match against the name */
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if (node->name.integer == target_name) {
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/* Resolve a control method alias if any */
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if (acpi_ns_get_type(node) ==
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ACPI_TYPE_LOCAL_METHOD_ALIAS) {
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node =
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ACPI_CAST_PTR(struct acpi_namespace_node,
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node->object);
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}
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/* Found matching entry */
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Name [%4.4s] (%s) %p found in scope [%4.4s] %p\n",
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ACPI_CAST_PTR(char, &target_name),
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acpi_ut_get_type_name(node->type),
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node,
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acpi_ut_get_node_name(parent_node),
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parent_node));
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*return_node = node;
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return_ACPI_STATUS(AE_OK);
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}
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/* Didn't match name, move on to the next peer object */
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node = node->peer;
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}
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/* Searched entire namespace level, not found */
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Name [%4.4s] (%s) not found in search in scope [%4.4s] "
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"%p first child %p\n",
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ACPI_CAST_PTR(char, &target_name),
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acpi_ut_get_type_name(type),
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acpi_ut_get_node_name(parent_node), parent_node,
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parent_node->child));
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return_ACPI_STATUS(AE_NOT_FOUND);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_search_parent_tree
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*
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* PARAMETERS: target_name - Ascii ACPI name to search for
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* node - Starting node where search will begin
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* type - Object type to match
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* return_node - Where the matched Node is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Called when a name has not been found in the current namespace
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* level. Before adding it or giving up, ACPI scope rules require
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* searching enclosing scopes in cases identified by acpi_ns_local().
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*
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* "A name is located by finding the matching name in the current
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* name space, and then in the parent name space. If the parent
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* name space does not contain the name, the search continues
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* recursively until either the name is found or the name space
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* does not have a parent (the root of the name space). This
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* indicates that the name is not found" (From ACPI Specification,
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* section 5.3)
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*
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******************************************************************************/
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static acpi_status
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acpi_ns_search_parent_tree(u32 target_name,
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struct acpi_namespace_node *node,
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acpi_object_type type,
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struct acpi_namespace_node **return_node)
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{
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acpi_status status;
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struct acpi_namespace_node *parent_node;
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ACPI_FUNCTION_TRACE(ns_search_parent_tree);
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parent_node = node->parent;
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/*
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* If there is no parent (i.e., we are at the root) or type is "local",
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* we won't be searching the parent tree.
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*/
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if (!parent_node) {
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "[%4.4s] has no parent\n",
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ACPI_CAST_PTR(char, &target_name)));
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return_ACPI_STATUS(AE_NOT_FOUND);
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}
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if (acpi_ns_local(type)) {
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"[%4.4s] type [%s] must be local to this scope (no parent search)\n",
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ACPI_CAST_PTR(char, &target_name),
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acpi_ut_get_type_name(type)));
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return_ACPI_STATUS(AE_NOT_FOUND);
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}
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/* Search the parent tree */
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Searching parent [%4.4s] for [%4.4s]\n",
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acpi_ut_get_node_name(parent_node),
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ACPI_CAST_PTR(char, &target_name)));
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/* Search parents until target is found or we have backed up to the root */
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while (parent_node) {
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/*
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* Search parent scope. Use TYPE_ANY because we don't care about the
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* object type at this point, we only care about the existence of
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* the actual name we are searching for. Typechecking comes later.
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*/
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status =
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acpi_ns_search_one_scope(target_name, parent_node,
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ACPI_TYPE_ANY, return_node);
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if (ACPI_SUCCESS(status)) {
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return_ACPI_STATUS(status);
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}
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/* Not found here, go up another level (until we reach the root) */
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parent_node = parent_node->parent;
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}
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/* Not found in parent tree */
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return_ACPI_STATUS(AE_NOT_FOUND);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_search_and_enter
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*
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* PARAMETERS: target_name - Ascii ACPI name to search for (4 chars)
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* walk_state - Current state of the walk
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* node - Starting node where search will begin
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* interpreter_mode - Add names only in ACPI_MODE_LOAD_PASS_x.
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* Otherwise,search only.
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* type - Object type to match
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* flags - Flags describing the search restrictions
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* return_node - Where the Node is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Search for a name segment in a single namespace level,
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* optionally adding it if it is not found. If the passed
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* Type is not Any and the type previously stored in the
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* entry was Any (i.e. unknown), update the stored type.
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*
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* In ACPI_IMODE_EXECUTE, search only.
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* In other modes, search and add if not found.
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*
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******************************************************************************/
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acpi_status
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acpi_ns_search_and_enter(u32 target_name,
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struct acpi_walk_state *walk_state,
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struct acpi_namespace_node *node,
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acpi_interpreter_mode interpreter_mode,
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acpi_object_type type,
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u32 flags, struct acpi_namespace_node **return_node)
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{
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acpi_status status;
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struct acpi_namespace_node *new_node;
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ACPI_FUNCTION_TRACE(ns_search_and_enter);
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/* Parameter validation */
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if (!node || !target_name || !return_node) {
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ACPI_ERROR((AE_INFO,
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"Null parameter: Node %p Name 0x%X ReturnNode %p",
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node, target_name, return_node));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* Name must consist of valid ACPI characters. We will repair the name if
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* necessary because we don't want to abort because of this, but we want
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* all namespace names to be printable. A warning message is appropriate.
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*
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* This issue came up because there are in fact machines that exhibit
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* this problem, and we want to be able to enable ACPI support for them,
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* even though there are a few bad names.
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*/
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acpi_ut_repair_name(ACPI_CAST_PTR(char, &target_name));
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/* Try to find the name in the namespace level specified by the caller */
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*return_node = ACPI_ENTRY_NOT_FOUND;
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status = acpi_ns_search_one_scope(target_name, node, type, return_node);
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if (status != AE_NOT_FOUND) {
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/*
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* If we found it AND the request specifies that a find is an error,
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* return the error
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*/
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if (status == AE_OK) {
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/* The node was found in the namespace */
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/*
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* If the namespace override feature is enabled for this node,
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* delete any existing attached sub-object and make the node
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* look like a new node that is owned by the override table.
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*/
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if (flags & ACPI_NS_OVERRIDE_IF_FOUND) {
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"Namespace override: %4.4s pass %u type %X Owner %X\n",
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ACPI_CAST_PTR(char,
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&target_name),
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interpreter_mode,
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(*return_node)->type,
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walk_state->owner_id));
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acpi_ns_delete_children(*return_node);
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if (acpi_gbl_runtime_namespace_override) {
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acpi_ut_remove_reference((*return_node)->object);
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(*return_node)->object = NULL;
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(*return_node)->owner_id =
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walk_state->owner_id;
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} else {
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acpi_ns_remove_node(*return_node);
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*return_node = ACPI_ENTRY_NOT_FOUND;
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}
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}
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/* Return an error if we don't expect to find the object */
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else if (flags & ACPI_NS_ERROR_IF_FOUND) {
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status = AE_ALREADY_EXISTS;
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}
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}
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#ifdef ACPI_ASL_COMPILER
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if (*return_node && (*return_node)->type == ACPI_TYPE_ANY) {
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(*return_node)->flags |= ANOBJ_IS_EXTERNAL;
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}
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#endif
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/* Either found it or there was an error: finished either way */
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return_ACPI_STATUS(status);
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}
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/*
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* The name was not found. If we are NOT performing the first pass
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* (name entry) of loading the namespace, search the parent tree (all the
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* way to the root if necessary.) We don't want to perform the parent
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* search when the namespace is actually being loaded. We want to perform
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* the search when namespace references are being resolved (load pass 2)
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* and during the execution phase.
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*/
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if ((interpreter_mode != ACPI_IMODE_LOAD_PASS1) &&
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(flags & ACPI_NS_SEARCH_PARENT)) {
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/*
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* Not found at this level - search parent tree according to the
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* ACPI specification
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*/
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status =
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acpi_ns_search_parent_tree(target_name, node, type,
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return_node);
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if (ACPI_SUCCESS(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* In execute mode, just search, never add names. Exit now */
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if (interpreter_mode == ACPI_IMODE_EXECUTE) {
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"%4.4s Not found in %p [Not adding]\n",
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ACPI_CAST_PTR(char, &target_name), node));
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return_ACPI_STATUS(AE_NOT_FOUND);
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}
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/* Create the new named object */
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new_node = acpi_ns_create_node(target_name);
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if (!new_node) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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#ifdef ACPI_ASL_COMPILER
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/* Node is an object defined by an External() statement */
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if (flags & ACPI_NS_EXTERNAL ||
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(walk_state && walk_state->opcode == AML_SCOPE_OP)) {
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new_node->flags |= ANOBJ_IS_EXTERNAL;
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}
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#endif
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if (flags & ACPI_NS_TEMPORARY) {
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new_node->flags |= ANOBJ_TEMPORARY;
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}
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/* Install the new object into the parent's list of children */
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acpi_ns_install_node(walk_state, node, new_node, type);
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*return_node = new_node;
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return_ACPI_STATUS(AE_OK);
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}
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