/******************************************************************************* * * Module Name: nsalloc - Namespace allocation and deletion utilities * ******************************************************************************/ /* * Copyright (C) 2000 - 2006, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <acpi/acpi.h> #include <acpi/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; 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++); 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 * ******************************************************************************/ void acpi_ns_delete_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_delete_node, node); parent_node = acpi_ns_get_parent_node(node); 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 = prev_node->peer; } if (prev_node) { /* Node is not first child, unlink it */ prev_node->peer = next_node->peer; if (next_node->flags & ANOBJ_END_OF_PEER_LIST) { prev_node->flags |= ANOBJ_END_OF_PEER_LIST; } } else { /* Node is first child (has no previous peer) */ if (next_node->flags & ANOBJ_END_OF_PEER_LIST) { /* No peers at all */ parent_node->child = NULL; } else { /* Link peer list to parent */ parent_node->child = next_node->peer; } } ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++); /* * Detach an object if there is one, then delete the node */ acpi_ns_detach_object(node); (void)acpi_os_release_object(acpi_gbl_namespace_cache, 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_node *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); /* * Get the owner ID from the Walk state * The owner ID is used to track table deletion and * deletion of objects created by methods */ if (walk_state) { owner_id = walk_state->owner_id; } /* Link the new entry into the parent and existing children */ child_node = parent_node->child; if (!child_node) { parent_node->child = node; node->flags |= ANOBJ_END_OF_PEER_LIST; node->peer = parent_node; } else { while (!(child_node->flags & ANOBJ_END_OF_PEER_LIST)) { child_node = child_node->peer; } child_node->peer = node; /* Clear end-of-list flag */ child_node->flags &= ~ANOBJ_END_OF_PEER_LIST; node->flags |= ANOBJ_END_OF_PEER_LIST; node->peer = parent_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 %X] 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 *child_node; struct acpi_namespace_node *next_node; u8 flags; ACPI_FUNCTION_TRACE_PTR(ns_delete_children, parent_node); if (!parent_node) { return_VOID; } /* If no children, all done! */ child_node = parent_node->child; if (!child_node) { return_VOID; } /* * Deallocate all children at this level */ do { /* Get the things we need */ next_node = child_node->peer; flags = child_node->flags; /* Grandchildren should have all been deleted already */ if (child_node->child) { ACPI_ERROR((AE_INFO, "Found a grandchild! P=%p C=%p", parent_node, child_node)); } /* Now we can free this child object */ ACPI_MEM_TRACKING(acpi_gbl_ns_node_list->total_freed++); ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Object %p, Remaining %X\n", child_node, acpi_gbl_current_node_count)); /* * Detach an object if there is one, then free the child node */ acpi_ns_detach_object(child_node); /* Now we can delete the node */ (void)acpi_os_release_object(acpi_gbl_namespace_cache, child_node); /* And move on to the next child in the list */ child_node = next_node; } while (!(flags & ANOBJ_END_OF_PEER_LIST)); /* 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_FUNCTION_TRACE(ns_delete_namespace_subtree); if (!parent_node) { 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(ACPI_TYPE_ANY, 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 (acpi_ns_get_next_node (ACPI_TYPE_ANY, child_node, NULL)) { /* * 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 = acpi_ns_get_parent_node(parent_node); } } 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(ACPI_TYPE_ANY, parent_node, child_node); if (deletion_node) { acpi_ns_delete_children(deletion_node); acpi_ns_delete_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 (acpi_ns_get_next_node (ACPI_TYPE_ANY, child_node, NULL)) { /* * 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 = acpi_ns_get_parent_node(parent_node); } } (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_VOID; }