ACPICA: Fixes for Unload and DDBHandles

Implemented support for the use of DDBHandles as an Indexed
Reference, as per the ACPI spec.

http://www.acpica.org/bugzilla/show_bug.cgi?id=486.

Implemented support for UserTerm (Method invocation) for the Unload operator
as per the ACPI spec.

http://www.acpica.org/bugzilla/show_bug.cgi?id=580

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

5 files changed, 88 insertions, 20 deletions

diff --git a/drivers/acpi/executer/exdump.c b/drivers/acpi/executer/exdump.c
index 251d84ba79b3..ed560e656f9a 100644
--- a/drivers/acpi/executer/exdump.c
+++ b/drivers/acpi/executer/exdump.c
@@ -895,14 +895,25 @@ static void acpi_ex_dump_reference_obj(union acpi_operand_object *obj_desc)
 	} else if (obj_desc->reference.object) {
 		if (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) ==
 		    ACPI_DESC_TYPE_OPERAND) {
-			acpi_os_printf(" Target: %p [%s]\n",
-				       obj_desc->reference.object,
-				       acpi_ut_get_type_name(((union
-							       acpi_operand_object
-							       *)obj_desc->
-							      reference.
-							      object)->common.
-							     type));
+			acpi_os_printf(" Target: %p",
+				       obj_desc->reference.object);
+			if (obj_desc->reference.opcode == AML_LOAD_OP) {
+				/*
+				 * For DDBHandle reference,
+				 * obj_desc->Reference.Object is the table index
+				 */
+				acpi_os_printf(" [DDBHandle]\n");
+			} else {
+				acpi_os_printf(" [%s]\n",
+					       acpi_ut_get_type_name(((union
+								       acpi_operand_object
+								       *)
+								      obj_desc->
+								      reference.
+								      object)->
+								     common.
+								     type));
+			}
 		} else {
 			acpi_os_printf(" Target: %p\n",
 				       obj_desc->reference.object);
diff --git a/drivers/acpi/executer/exresolv.c b/drivers/acpi/executer/exresolv.c
index 9c3cdf61dc34..5b5b2ff45ea2 100644
--- a/drivers/acpi/executer/exresolv.c
+++ b/drivers/acpi/executer/exresolv.c
@@ -382,10 +382,10 @@ acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state,
 	}
 
 	/*
-	 * For reference objects created via the ref_of or Index operators,
-	 * we need to get to the base object (as per the ACPI specification
-	 * of the object_type and size_of operators). This means traversing
-	 * the list of possibly many nested references.
+	 * For reference objects created via the ref_of, Index, or Load/load_table
+	 * operators, we need to get to the base object (as per the ACPI
+	 * specification of the object_type and size_of operators). This means
+	 * traversing the list of possibly many nested references.
 	 */
 	while (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_LOCAL_REFERENCE) {
 		switch (obj_desc->reference.opcode) {
@@ -455,6 +455,11 @@ acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state,
 			}
 			break;
 
+		case AML_LOAD_OP:
+
+			type = ACPI_TYPE_DDB_HANDLE;
+			goto exit;
+
 		case AML_LOCAL_OP:
 		case AML_ARG_OP:
 
diff --git a/drivers/acpi/executer/exstore.c b/drivers/acpi/executer/exstore.c
index 2408122cb3b2..725614e277f8 100644
--- a/drivers/acpi/executer/exstore.c
+++ b/drivers/acpi/executer/exstore.c
@@ -434,11 +434,24 @@ acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
 		 */
 		obj_desc = *(index_desc->reference.where);
 
-		status =
-		    acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc,
-						    walk_state);
-		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
+		if (ACPI_GET_OBJECT_TYPE(source_desc) ==
+		    ACPI_TYPE_LOCAL_REFERENCE
+		    && source_desc->reference.opcode == AML_LOAD_OP) {
+
+			/* This is a DDBHandle, just add a reference to it */
+
+			acpi_ut_add_reference(source_desc);
+			new_desc = source_desc;
+		} else {
+			/* Normal object, copy it */
+
+			status =
+			    acpi_ut_copy_iobject_to_iobject(source_desc,
+							    &new_desc,
+							    walk_state);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
 		}
 
 		if (obj_desc) {
diff --git a/drivers/acpi/parser/psargs.c b/drivers/acpi/parser/psargs.c
index 442880f5600e..2a3a948dd114 100644
--- a/drivers/acpi/parser/psargs.c
+++ b/drivers/acpi/parser/psargs.c
@@ -235,6 +235,7 @@ acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
 	union acpi_parse_object *name_op;
 	union acpi_operand_object *method_desc;
 	struct acpi_namespace_node *node;
+	u8 *start = parser_state->aml;
 
 	ACPI_FUNCTION_TRACE(ps_get_next_namepath);
 
@@ -267,6 +268,16 @@ acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
 	 */
 	if (ACPI_SUCCESS(status) &&
 	    possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
+		if (walk_state->op->common.aml_opcode == AML_UNLOAD_OP) {
+			/*
+			 * acpi_ps_get_next_namestring has increased the AML pointer,
+			 * so we need to restore the saved AML pointer for method call.
+			 */
+			walk_state->parser_state.aml = start;
+			walk_state->arg_count = 1;
+			acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
+			return_ACPI_STATUS(AE_OK);
+		}
 
 		/* This name is actually a control method invocation */
 
@@ -678,9 +689,29 @@ acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
 				return_ACPI_STATUS(AE_NO_MEMORY);
 			}
 
-			status =
-			    acpi_ps_get_next_namepath(walk_state, parser_state,
-						      arg, 0);
+			/* To support super_name arg of Unload */
+
+			if (walk_state->op->common.aml_opcode == AML_UNLOAD_OP) {
+				status =
+				    acpi_ps_get_next_namepath(walk_state,
+							      parser_state, arg,
+							      1);
+
+				/*
+				 * If the super_name arg of Unload is a method call,
+				 * we have restored the AML pointer, just free this Arg
+				 */
+				if (arg->common.aml_opcode ==
+				    AML_INT_METHODCALL_OP) {
+					acpi_ps_free_op(arg);
+					arg = NULL;
+				}
+			} else {
+				status =
+				    acpi_ps_get_next_namepath(walk_state,
+							      parser_state, arg,
+							      0);
+			}
 		} else {
 			/* Single complex argument, nothing returned */
 
diff --git a/drivers/acpi/utilities/utcopy.c b/drivers/acpi/utilities/utcopy.c
index b56953d2b59e..ba899714733b 100644
--- a/drivers/acpi/utilities/utcopy.c
+++ b/drivers/acpi/utilities/utcopy.c
@@ -709,7 +709,15 @@ acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
 		/*
 		 * We copied the reference object, so we now must add a reference
 		 * to the object pointed to by the reference
+		 *
+		 * DDBHandle reference (from Load/load_table is a special reference,
+		 * it's Reference.Object is the table index, so does not need to
+		 * increase the reference count
 		 */
+		if (source_desc->reference.opcode == AML_LOAD_OP) {
+			break;
+		}
+
 		acpi_ut_add_reference(source_desc->reference.object);
 		break;