Merge branch 'linus' into core/iommu

1 files changed, 265 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/nsnames.c b/drivers/acpi/acpica/nsnames.c
new file mode 100644
index 000000000000..ae3dc10a7e81
--- /dev/null
+++ b/drivers/acpi/acpica/nsnames.c
@@ -0,0 +1,265 @@
+/*******************************************************************************
+ *
+ * Module Name: nsnames - Name manipulation and search
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * 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 "accommon.h"
+#include "amlcode.h"
+#include "acnamesp.h"
+
+#define _COMPONENT          ACPI_NAMESPACE
+ACPI_MODULE_NAME("nsnames")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_build_external_path
+ *
+ * PARAMETERS:  Node            - NS node whose pathname is needed
+ *              Size            - Size of the pathname
+ *              *name_buffer    - Where to return the pathname
+ *
+ * RETURN:      Status
+ *              Places the pathname into the name_buffer, in external format
+ *              (name segments separated by path separators)
+ *
+ * DESCRIPTION: Generate a full pathaname
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ns_build_external_path(struct acpi_namespace_node *node,
+			    acpi_size size, char *name_buffer)
+{
+	acpi_size index;
+	struct acpi_namespace_node *parent_node;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Special case for root */
+
+	index = size - 1;
+	if (index < ACPI_NAME_SIZE) {
+		name_buffer[0] = AML_ROOT_PREFIX;
+		name_buffer[1] = 0;
+		return (AE_OK);
+	}
+
+	/* Store terminator byte, then build name backwards */
+
+	parent_node = node;
+	name_buffer[index] = 0;
+
+	while ((index > ACPI_NAME_SIZE) && (parent_node != acpi_gbl_root_node)) {
+		index -= ACPI_NAME_SIZE;
+
+		/* Put the name into the buffer */
+
+		ACPI_MOVE_32_TO_32((name_buffer + index), &parent_node->name);
+		parent_node = acpi_ns_get_parent_node(parent_node);
+
+		/* Prefix name with the path separator */
+
+		index--;
+		name_buffer[index] = ACPI_PATH_SEPARATOR;
+	}
+
+	/* Overwrite final separator with the root prefix character */
+
+	name_buffer[index] = AML_ROOT_PREFIX;
+
+	if (index != 0) {
+		ACPI_ERROR((AE_INFO,
+			    "Could not construct external pathname; index=%X, size=%X, Path=%s",
+			    (u32) index, (u32) size, &name_buffer[size]));
+
+		return (AE_BAD_PARAMETER);
+	}
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_get_external_pathname
+ *
+ * PARAMETERS:  Node            - Namespace node whose pathname is needed
+ *
+ * RETURN:      Pointer to storage containing the fully qualified name of
+ *              the node, In external format (name segments separated by path
+ *              separators.)
+ *
+ * DESCRIPTION: Used for debug printing in acpi_ns_search_table().
+ *
+ ******************************************************************************/
+
+char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
+{
+	acpi_status status;
+	char *name_buffer;
+	acpi_size size;
+
+	ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node);
+
+	/* Calculate required buffer size based on depth below root */
+
+	size = acpi_ns_get_pathname_length(node);
+	if (!size) {
+		return_PTR(NULL);
+	}
+
+	/* Allocate a buffer to be returned to caller */
+
+	name_buffer = ACPI_ALLOCATE_ZEROED(size);
+	if (!name_buffer) {
+		ACPI_ERROR((AE_INFO, "Allocation failure"));
+		return_PTR(NULL);
+	}
+
+	/* Build the path in the allocated buffer */
+
+	status = acpi_ns_build_external_path(node, size, name_buffer);
+	if (ACPI_FAILURE(status)) {
+		ACPI_FREE(name_buffer);
+		return_PTR(NULL);
+	}
+
+	return_PTR(name_buffer);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_get_pathname_length
+ *
+ * PARAMETERS:  Node        - Namespace node
+ *
+ * RETURN:      Length of path, including prefix
+ *
+ * DESCRIPTION: Get the length of the pathname string for this node
+ *
+ ******************************************************************************/
+
+acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
+{
+	acpi_size size;
+	struct acpi_namespace_node *next_node;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/*
+	 * Compute length of pathname as 5 * number of name segments.
+	 * Go back up the parent tree to the root
+	 */
+	size = 0;
+	next_node = node;
+
+	while (next_node && (next_node != acpi_gbl_root_node)) {
+		if (ACPI_GET_DESCRIPTOR_TYPE(next_node) != ACPI_DESC_TYPE_NAMED) {
+			ACPI_ERROR((AE_INFO,
+				    "Invalid Namespace Node (%p) while traversing namespace",
+				    next_node));
+			return 0;
+		}
+		size += ACPI_PATH_SEGMENT_LENGTH;
+		next_node = acpi_ns_get_parent_node(next_node);
+	}
+
+	if (!size) {
+		size = 1;	/* Root node case */
+	}
+
+	return (size + 1);	/* +1 for null string terminator */
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_handle_to_pathname
+ *
+ * PARAMETERS:  target_handle           - Handle of named object whose name is
+ *                                        to be found
+ *              Buffer                  - Where the pathname is returned
+ *
+ * RETURN:      Status, Buffer is filled with pathname if status is AE_OK
+ *
+ * DESCRIPTION: Build and return a full namespace pathname
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_handle_to_pathname(acpi_handle target_handle,
+			   struct acpi_buffer * buffer)
+{
+	acpi_status status;
+	struct acpi_namespace_node *node;
+	acpi_size required_size;
+
+	ACPI_FUNCTION_TRACE_PTR(ns_handle_to_pathname, target_handle);
+
+	node = acpi_ns_map_handle_to_node(target_handle);
+	if (!node) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Determine size required for the caller buffer */
+
+	required_size = acpi_ns_get_pathname_length(node);
+	if (!required_size) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Validate/Allocate/Clear caller buffer */
+
+	status = acpi_ut_initialize_buffer(buffer, required_size);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Build the path in the caller buffer */
+
+	status =
+	    acpi_ns_build_external_path(node, required_size, buffer->pointer);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s [%X]\n",
+			  (char *)buffer->pointer, (u32) required_size));
+	return_ACPI_STATUS(AE_OK);
+}