// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: nsalloc - Namespace allocation and deletion utilities
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME(
"nsalloc")
/*******************************************************************************
*
* FUNCTION: acpi_ns_create_node
*
* PARAMETERS: name - Name of the new node (4 char ACPI name)
*
* RETURN: New namespace node (Null on failure)
*
* DESCRIPTION: Create a namespace node
*
******************************************************************************/
struct acpi_namespace_node *acpi_ns_create_node(u32 name)
{
struct acpi_namespace_node *node;
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
u32 temp;
#endif
ACPI_FUNCTION_TRACE(ns_create_node);
node = acpi_os_acquire_object(acpi_gbl_namespace_cache);
if (!node) {
return_PTR(NULL);
}
ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_allocated++);
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
temp = acpi_gbl_ns_node_list->total_allocated -
acpi_gbl_ns_node_list->total_freed;
if (temp > acpi_gbl_ns_node_list->max_occupied) {
acpi_gbl_ns_node_list->max_occupied = temp;
}
#endif
node->name.integer = name;
ACPI_SET_DESCRIPTOR_TYPE(node, ACPI_DESC_TYPE_NAMED);
return_PTR(node);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_delete_node
*
* PARAMETERS: node - Node to be deleted
*
* RETURN: None
*
* DESCRIPTION: Delete a namespace node. All node deletions must come through
* here. Detaches any attached objects, including any attached
* data. If a handler is associated with attached data, it is
* invoked before the node is deleted.
*
******************************************************************************/
void acpi_ns_delete_node(
struct acpi_namespace_node *node)
{
union acpi_operand_object *obj_desc;
union acpi_operand_object *next_desc;
ACPI_FUNCTION_NAME(ns_delete_node);
if (!node) {
return_VOID;
}
/* Detach an object if there is one */
acpi_ns_detach_object(node);
/*
* Delete an attached data object list if present (objects that were
* attached via acpi_attach_data). Note: After any normal object is
* detached above, the only possible remaining object(s) are data
* objects, in a linked list.
*/
obj_desc = node->object;
while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
/* Invoke the attached data deletion handler if present */
if (obj_desc->data.handler) {
obj_desc->data.handler(node, obj_desc->data.pointer);
}
next_desc = obj_desc->common.next_object;
acpi_ut_remove_reference(obj_desc);
obj_desc = next_desc;
}
/* Special case for the statically allocated root node */
if (node == acpi_gbl_root_node) {
return;
}
/* Now we can delete the node */
(
void)acpi_os_release_object(acpi_gbl_namespace_cache, node);
ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++);
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"Node %p, Remaining %X\n",
node, acpi_gbl_current_node_count));
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_remove_node
*
* PARAMETERS: node - Node to be removed/deleted
*
* RETURN: None
*
* DESCRIPTION: Remove (unlink) and delete a namespace node
*
******************************************************************************/
void acpi_ns_remove_node(
struct acpi_namespace_node *node)
{
struct acpi_namespace_node *parent_node;
struct acpi_namespace_node *prev_node;
struct acpi_namespace_node *next_node;
ACPI_FUNCTION_TRACE_PTR(ns_remove_node, node);
parent_node = node->parent;
prev_node = NULL;
next_node = parent_node->child;
/* Find the node that is the previous peer in the parent's child list */
while (next_node != node) {
prev_node = next_node;
next_node = next_node->peer;
}
if (prev_node) {
/* Node is not first child, unlink it */
prev_node->peer = node->peer;
}
else {
/*
* Node is first child (has no previous peer).
* Link peer list to parent
*/
parent_node->child = node->peer;
}
/* Delete the node and any attached objects */
acpi_ns_delete_node(node);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_install_node
*
* PARAMETERS: walk_state - Current state of the walk
* parent_node - The parent of the new Node
* node - The new Node to install
* type - ACPI object type of the new Node
*
* RETURN: None
*
* DESCRIPTION: Initialize a new namespace node and install it amongst
* its peers.
*
* Note: Current namespace lookup is linear search. This appears
* to be sufficient as namespace searches consume only a small
* fraction of the execution time of the ACPI subsystem.
*
******************************************************************************/
void acpi_ns_install_node(
struct acpi_walk_state *walk_state,
struct acpi_namespace_n
ode *parent_node, /* Parent */
struct acpi_namespace_node *node, /* New Child */
acpi_object_type type)
{
acpi_owner_id owner_id = 0;
struct acpi_namespace_node *child_node;
ACPI_FUNCTION_TRACE(ns_install_node);
if (walk_state) {
/*
* Get the owner ID from the Walk state. The owner ID is used to
* track table deletion and deletion of objects created by methods.
*/
owner_id = walk_state->owner_id;
if ((walk_state->method_desc) &&
(parent_node != walk_state->method_node)) {
/*
* A method is creating a new node that is not a child of the
* method (it is non-local). Mark the executing method as having
* modified the namespace. This is used for cleanup when the
* method exits.
*/
walk_state->method_desc->method.info_flags |=
ACPI_METHOD_MODIFIED_NAMESPACE;
}
}
/* Link the new entry into the parent and existing children */
node->peer = NULL;
node->parent = parent_node;
child_node = parent_node->child;
if (!child_node) {
parent_node->child = node;
} else {
/* Add node to the end of the peer list */
while (child_node->peer) {
child_node = child_node->peer;
}
child_node->peer = node;
}
/* Init the new entry */
node->owner_id = owner_id;
node->type = (u8) type;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"%4.4s (%s) [Node %p Owner %3.3X] added to %4.4s (%s) [Node %p]\n",
acpi_ut_get_node_name(node),
acpi_ut_get_type_name(node->type), node, owner_id,
acpi_ut_get_node_name(parent_node),
acpi_ut_get_type_name(parent_node->type),
parent_node));
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_delete_children
*
* PARAMETERS: parent_node - Delete this objects children
*
* RETURN: None.
*
* DESCRIPTION: Delete all children of the parent object. In other words,
* deletes a "scope".
*
******************************************************************************/
void acpi_ns_delete_children(struct acpi_namespace_node *parent_node)
{
struct acpi_namespace_node *next_node;
struct acpi_namespace_node *node_to_delete;
ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node);
if (!parent_node) {
return_VOID;
}
/* Deallocate all children at this level */
next_node = parent_node->child;
while (next_node) {
/* Grandchildren should have all been deleted already */
if (next_node->child) {
ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p",
parent_node, next_node));
}
/*
* Delete this child node and move on to the next child in the list.
* No need to unlink the node since we are deleting the entire branch.
*/
node_to_delete = next_node;
next_node = next_node->peer;
acpi_ns_delete_node(node_to_delete);
}
/* Clear the parent's child pointer */
parent_node->child = NULL;
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_delete_namespace_subtree
*
* PARAMETERS: parent_node - Root of the subtree to be deleted
*
* RETURN: None.
*
* DESCRIPTION: Delete a subtree of the namespace. This includes all objects
* stored within the subtree.
*
******************************************************************************/
void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node)
{
struct acpi_namespace_node *child_node = NULL;
u32 level = 1;
acpi_status status;
ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree);
if (!parent_node) {
return_VOID;
}
/* Lock namespace for possible update */
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_VOID;
}
/*
* Traverse the tree of objects until we bubble back up
* to where we started.
*/
while (level > 0) {
/* Get the next node in this scope (NULL if none) */
child_node = acpi_ns_get_next_node(parent_node, child_node);
if (child_node) {
/* Found a child node - detach any attached object */
acpi_ns_detach_object(child_node);
/* Check if this node has any children */
if (child_node->child) {
/*
* There is at least one child of this node,
* visit the node
*/
level++;
parent_node = child_node;
child_node = NULL;
}
} else {
/*
* No more children of this parent node.
* Move up to the grandparent.
*/
level--;
/*
* Now delete all of the children of this parent
* all at the same time.
*/
acpi_ns_delete_children(parent_node);
/* New "last child" is this parent node */
child_node = parent_node;
/* Move up the tree to the grandparent */
parent_node = parent_node->parent;
}
}
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_delete_namespace_by_owner
*
* PARAMETERS: owner_id - All nodes with this owner will be deleted
*
* RETURN: Status
*
* DESCRIPTION: Delete entries within the namespace that are owned by a
* specific ID. Used to delete entire ACPI tables. All
* reference counts are updated.
*
* MUTEX: Locks namespace during deletion walk.
*
******************************************************************************/
void acpi_ns_delete_namespace_by_owner(acpi_owner_id owner_id)
{
struct acpi_namespace_node *child_node;
struct acpi_namespace_node *deletion_node;
struct acpi_namespace_node *parent_node;
u32 level;
acpi_status status;
ACPI_FUNCTION_TRACE_U32(ns_delete_namespace_by_owner, owner_id);
if (owner_id == 0) {
return_VOID;
}
/* Lock namespace for possible update */
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_VOID;
}
deletion_node = NULL;
parent_node = acpi_gbl_root_node;
child_node = NULL;
level = 1;
/*
* Traverse the tree of nodes until we bubble back up
* to where we started.
*/
while (level > 0) {
/*
* Get the next child of this parent node. When child_node is NULL,
* the first child of the parent is returned
*/
child_node = acpi_ns_get_next_node(parent_node, child_node);
if (deletion_node) {
acpi_ns_delete_children(deletion_node);
acpi_ns_remove_node(deletion_node);
deletion_node = NULL;
}
if (child_node) {
if (child_node->owner_id == owner_id) {
/* Found a matching child node - detach any attached object */
acpi_ns_detach_object(child_node);
}
/* Check if this node has any children */
if (child_node->child) {
/*
* There is at least one child of this node,
* visit the node
*/
level++;
parent_node = child_node;
child_node = NULL;
} else if (child_node->owner_id == owner_id) {
deletion_node = child_node;
}
} else {
/*
* No more children of this parent node.
* Move up to the grandparent.
*/
level--;
if (level != 0) {
if (parent_node->owner_id == owner_id) {
deletion_node = parent_node;
}
}
/* New "last child" is this parent node */
child_node = parent_node;
/* Move up the tree to the grandparent */
parent_node = parent_node->parent;
}
}
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return_VOID;
}
