1 files changed, 494 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsalloc.c b/drivers/acpi/acpica/nsalloc.c
new file mode 100644
index 0000000000..83d26abcf4
--- /dev/null
+++ b/drivers/acpi/acpica/nsalloc.c
@@ -0,0 +1,494 @@
+// 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_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);
+
+	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;
+}