491 строка
12 KiB
C
491 строка
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: nsalloc - Namespace allocation and deletion utilities
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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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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("nsalloc")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_create_node
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*
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* PARAMETERS: name - Name of the new node (4 char ACPI name)
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*
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* RETURN: New namespace node (Null on failure)
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*
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* DESCRIPTION: Create a namespace node
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*
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******************************************************************************/
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struct acpi_namespace_node *acpi_ns_create_node(u32 name)
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{
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struct acpi_namespace_node *node;
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#ifdef ACPI_DBG_TRACK_ALLOCATIONS
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u32 temp;
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#endif
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ACPI_FUNCTION_TRACE(ns_create_node);
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node = acpi_os_acquire_object(acpi_gbl_namespace_cache);
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if (!node) {
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return_PTR(NULL);
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}
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ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++);
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#ifdef ACPI_DBG_TRACK_ALLOCATIONS
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temp = acpi_gbl_ns_node_list->total_allocated -
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acpi_gbl_ns_node_list->total_freed;
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if (temp > acpi_gbl_ns_node_list->max_occupied) {
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acpi_gbl_ns_node_list->max_occupied = temp;
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}
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#endif
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node->name.integer = name;
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ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED);
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return_PTR(node);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_delete_node
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*
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* PARAMETERS: node - Node to be deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: Delete a namespace node. All node deletions must come through
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* here. Detaches any attached objects, including any attached
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* data. If a handler is associated with attached data, it is
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* invoked before the node is deleted.
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*
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******************************************************************************/
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void acpi_ns_delete_node(struct acpi_namespace_node *node)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *next_desc;
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ACPI_FUNCTION_NAME(ns_delete_node);
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/* Detach an object if there is one */
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acpi_ns_detach_object(node);
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/*
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* Delete an attached data object list if present (objects that were
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* attached via acpi_attach_data). Note: After any normal object is
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* detached above, the only possible remaining object(s) are data
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* objects, in a linked list.
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*/
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obj_desc = node->object;
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while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
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/* Invoke the attached data deletion handler if present */
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if (obj_desc->data.handler) {
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obj_desc->data.handler(node, obj_desc->data.pointer);
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}
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next_desc = obj_desc->common.next_object;
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acpi_ut_remove_reference(obj_desc);
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obj_desc = next_desc;
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}
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/* Special case for the statically allocated root node */
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if (node == acpi_gbl_root_node) {
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return;
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}
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/* Now we can delete the node */
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(void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
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ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Node %p, Remaining %X\n",
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node, acpi_gbl_current_node_count));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_remove_node
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*
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* PARAMETERS: node - Node to be removed/deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: Remove (unlink) and delete a namespace node
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*
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******************************************************************************/
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void acpi_ns_remove_node(struct acpi_namespace_node *node)
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{
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struct acpi_namespace_node *parent_node;
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struct acpi_namespace_node *prev_node;
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struct acpi_namespace_node *next_node;
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ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node);
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parent_node = node->parent;
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prev_node = NULL;
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next_node = parent_node->child;
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/* Find the node that is the previous peer in the parent's child list */
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while (next_node != node) {
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prev_node = next_node;
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next_node = next_node->peer;
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}
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if (prev_node) {
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/* Node is not first child, unlink it */
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prev_node->peer = node->peer;
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} else {
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/*
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* Node is first child (has no previous peer).
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* Link peer list to parent
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*/
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parent_node->child = node->peer;
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}
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/* Delete the node and any attached objects */
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acpi_ns_delete_node(node);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_install_node
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*
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* PARAMETERS: walk_state - Current state of the walk
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* parent_node - The parent of the new Node
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* node - The new Node to install
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* type - ACPI object type of the new Node
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*
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* RETURN: None
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*
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* DESCRIPTION: Initialize a new namespace node and install it amongst
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* its peers.
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*
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* Note: Current namespace lookup is linear search. This appears
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* to be sufficient as namespace searches consume only a small
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* fraction of the execution time of the ACPI subsystem.
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*
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******************************************************************************/
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void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *parent_node, /* Parent */
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struct acpi_namespace_node *node, /* New Child */
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acpi_object_type type)
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{
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acpi_owner_id owner_id = 0;
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struct acpi_namespace_node *child_node;
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ACPI_FUNCTION_TRACE(ns_install_node);
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if (walk_state) {
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/*
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* Get the owner ID from the Walk state. The owner ID is used to
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* track table deletion and deletion of objects created by methods.
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*/
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owner_id = walk_state->owner_id;
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if ((walk_state->method_desc) &&
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(parent_node != walk_state->method_node)) {
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/*
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* A method is creating a new node that is not a child of the
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* method (it is non-local). Mark the executing method as having
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* modified the namespace. This is used for cleanup when the
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* method exits.
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*/
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walk_state->method_desc->method.info_flags |=
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ACPI_METHOD_MODIFIED_NAMESPACE;
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}
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}
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/* Link the new entry into the parent and existing children */
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node->peer = NULL;
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node->parent = parent_node;
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child_node = parent_node->child;
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if (!child_node) {
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parent_node->child = node;
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} else {
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/* Add node to the end of the peer list */
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while (child_node->peer) {
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child_node = child_node->peer;
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}
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child_node->peer = node;
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}
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/* Init the new entry */
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node->owner_id = owner_id;
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node->type = (u8) type;
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ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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"%4.4s (%s) [Node %p Owner %X] added to %4.4s (%s) [Node %p]\n",
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acpi_ut_get_node_name(node),
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acpi_ut_get_type_name(node->type), node, owner_id,
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acpi_ut_get_node_name(parent_node),
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acpi_ut_get_type_name(parent_node->type),
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parent_node));
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_delete_children
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*
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* PARAMETERS: parent_node - Delete this objects children
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*
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* RETURN: None.
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*
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* DESCRIPTION: Delete all children of the parent object. In other words,
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* deletes a "scope".
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*
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******************************************************************************/
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void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
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{
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struct acpi_namespace_node *next_node;
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struct acpi_namespace_node *node_to_delete;
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ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
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if (!parent_node) {
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return_VOID;
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}
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/* Deallocate all children at this level */
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next_node = parent_node->child;
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while (next_node) {
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/* Grandchildren should have all been deleted already */
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if (next_node->child) {
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ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
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parent_node, next_node));
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}
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/*
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* Delete this child node and move on to the next child in the list.
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* No need to unlink the node since we are deleting the entire branch.
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*/
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node_to_delete = next_node;
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next_node = next_node->peer;
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acpi_ns_delete_node(node_to_delete);
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};
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/* Clear the parent's child pointer */
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parent_node->child = NULL;
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_delete_namespace_subtree
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*
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* PARAMETERS: parent_node - Root of the subtree to be deleted
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*
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* RETURN: None.
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*
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* DESCRIPTION: Delete a subtree of the namespace. This includes all objects
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* stored within the subtree.
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*
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******************************************************************************/
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void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
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{
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struct acpi_namespace_node *child_node = NULL;
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u32 level = 1;
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acpi_status status;
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ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
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if (!parent_node) {
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return_VOID;
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}
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/* Lock namespace for possible update */
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_VOID;
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}
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/*
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* Traverse the tree of objects until we bubble back up
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* to where we started.
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*/
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while (level > 0) {
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/* Get the next node in this scope (NULL if none) */
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child_node = acpi_ns_get_next_node(parent_node, child_node);
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if (child_node) {
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/* Found a child node - detach any attached object */
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acpi_ns_detach_object(child_node);
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/* Check if this node has any children */
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if (child_node->child) {
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/*
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* There is at least one child of this node,
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* visit the node
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*/
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level++;
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parent_node = child_node;
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child_node = NULL;
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}
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} else {
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/*
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* No more children of this parent node.
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* Move up to the grandparent.
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*/
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level--;
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/*
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* Now delete all of the children of this parent
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* all at the same time.
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*/
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acpi_ns_delete_children(parent_node);
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/* New "last child" is this parent node */
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child_node = parent_node;
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/* Move up the tree to the grandparent */
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parent_node = parent_node->parent;
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}
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_delete_namespace_by_owner
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*
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* PARAMETERS: owner_id - All nodes with this owner will be deleted
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*
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* RETURN: Status
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*
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* DESCRIPTION: Delete entries within the namespace that are owned by a
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* specific ID. Used to delete entire ACPI tables. All
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* reference counts are updated.
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*
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* MUTEX: Locks namespace during deletion walk.
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*
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******************************************************************************/
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void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
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{
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struct acpi_namespace_node *child_node;
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struct acpi_namespace_node *deletion_node;
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struct acpi_namespace_node *parent_node;
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u32 level;
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acpi_status status;
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ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);
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if (owner_id == 0) {
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return_VOID;
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}
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/* Lock namespace for possible update */
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_VOID;
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}
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deletion_node = NULL;
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parent_node = acpi_gbl_root_node;
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child_node = NULL;
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level = 1;
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/*
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* Traverse the tree of nodes until we bubble back up
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* to where we started.
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*/
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while (level > 0) {
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/*
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* Get the next child of this parent node. When child_node is NULL,
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* the first child of the parent is returned
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*/
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child_node = acpi_ns_get_next_node(parent_node, child_node);
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if (deletion_node) {
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acpi_ns_delete_children(deletion_node);
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acpi_ns_remove_node(deletion_node);
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deletion_node = NULL;
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}
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if (child_node) {
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if (child_node->owner_id == owner_id) {
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/* Found a matching child node - detach any attached object */
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acpi_ns_detach_object(child_node);
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}
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/* Check if this node has any children */
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if (child_node->child) {
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/*
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* There is at least one child of this node,
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* visit the node
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*/
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level++;
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parent_node = child_node;
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child_node = NULL;
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} else if (child_node->owner_id == owner_id) {
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deletion_node = child_node;
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}
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} else {
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/*
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* No more children of this parent node.
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* Move up to the grandparent.
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*/
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level--;
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if (level != 0) {
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if (parent_node->owner_id == owner_id) {
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deletion_node = parent_node;
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}
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}
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/* New "last child" is this parent node */
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child_node = parent_node;
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/* Move up the tree to the grandparent */
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parent_node = parent_node->parent;
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}
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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return_VOID;
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}
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