ACPICA: Namespace: Add function to directly return normalized full path

ACPICA commit 6e0229bb156d71675f2e07dc7960adb7ec0a60ea

This patch adds functions to return normalized full path instead of
"external path". The external path contains trailing "_" for each
name segment while the normalized full path doesn't contain the
trailing "_".

Currently this function is used by the method tracing users to specify a
none trailing "_" attached name path. Lv Zheng.

Note that we need to validate and switch all Linux kernel acpi_get_name()
users to use the new name type before removing the old name type from
ACPICA.

Link: https://github.com/acpica/acpica/commit/6e0229bbSigned-off-by: Lv Zheng <lv.zheng@intel.com>
Reviewed-by: Ruiyi Zhang <ruiyi_zhang@hotmail.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acnamesp.h

@@ -272,17 +272,20 @@ acpi_ns_check_package(struct acpi_evaluate_info *info,
  */
 u32 acpi_ns_opens_scope(acpi_object_type type);
 
-acpi_status
-acpi_ns_build_external_path(struct acpi_namespace_node *node,
-			    acpi_size size, char *name_buffer);
-
 char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node);
 
+u32
+acpi_ns_build_normalized_path(struct acpi_namespace_node *node,
+			      char *full_path, u32 path_size, u8 no_trailing);
+
+char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node,
+				      u8 no_trailing);
+
 char *acpi_ns_name_of_current_scope(struct acpi_walk_state *walk_state);
 
 acpi_status
 acpi_ns_handle_to_pathname(acpi_handle target_handle,
-			   struct acpi_buffer *buffer);
+			   struct acpi_buffer *buffer, u8 no_trailing);
 
 u8
 acpi_ns_pattern_match(struct acpi_namespace_node *obj_node, char *search_for);

drivers/acpi/acpica/exdump.c

@@ -995,9 +995,8 @@ static void acpi_ex_dump_reference_obj(union acpi_operand_object *obj_desc)
 	if (obj_desc->reference.class == ACPI_REFCLASS_NAME) {
 		acpi_os_printf(" %p ", obj_desc->reference.node);
 
-		status =
-		    acpi_ns_handle_to_pathname(obj_desc->reference.node,
-					       &ret_buf);
+		status = acpi_ns_handle_to_pathname(obj_desc->reference.node,
+						    &ret_buf, FALSE);
 		if (ACPI_FAILURE(status)) {
 			acpi_os_printf(" Could not convert name to pathname\n");
 		} else {

drivers/acpi/acpica/nsutils.c

@@ -83,7 +83,7 @@ acpi_ns_print_node_pathname(struct acpi_namespace_node *node,
 
 	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 
-	status = acpi_ns_handle_to_pathname(node, &buffer);
+	status = acpi_ns_handle_to_pathname(node, &buffer, FALSE);
 	if (ACPI_SUCCESS(status)) {
 		if (message) {
 			acpi_os_printf("%s ", message);

drivers/acpi/acpica/nsxfname.c

@@ -172,11 +172,15 @@ acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 		return (status);
 	}
 
-	if (name_type == ACPI_FULL_PATHNAME) {
+	if (name_type == ACPI_FULL_PATHNAME ||
+	    name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {
 
 		/* Get the full pathname (From the namespace root) */
 
-		status = acpi_ns_handle_to_pathname(handle, buffer);
+		status = acpi_ns_handle_to_pathname(handle, buffer,
+						    name_type ==
+						    ACPI_FULL_PATHNAME ? FALSE :
+						    TRUE);
 		return (status);
 	}
 

drivers/acpi/acpica/rscreate.c

@@ -348,7 +348,8 @@ acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 				status =
 				    acpi_ns_handle_to_pathname((acpi_handle)
 							       node,
-							       &path_buffer);
+							       &path_buffer,
+							       FALSE);
 
 				/* +1 to include null terminator */
 

drivers/acpi/acpica/utmisc.c

@@ -376,7 +376,7 @@ acpi_ut_display_init_pathname(u8 type,
 	/* Get the full pathname to the node */
 
 	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
-	status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
+	status = acpi_ns_handle_to_pathname(obj_handle, &buffer, FALSE);
 	if (ACPI_FAILURE(status)) {
 		return;
 	}

include/acpi/actypes.h

@@ -985,7 +985,8 @@ struct acpi_buffer {
  */
 #define ACPI_FULL_PATHNAME              0
 #define ACPI_SINGLE_NAME                1
-#define ACPI_NAME_TYPE_MAX              1
+#define ACPI_FULL_PATHNAME_NO_TRAILING  2
+#define ACPI_NAME_TYPE_MAX              2
 
 /*
  * Predefined Namespace items