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494 lines
12 KiB
494 lines
12 KiB
// 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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if (!node) { |
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return_VOID; |
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} |
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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 %3.3X] 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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