diff options
Diffstat (limited to 'drivers/acpi/namespace/nseval.c')
| -rw-r--r-- | drivers/acpi/namespace/nseval.c | 484 |
1 files changed, 117 insertions, 367 deletions
diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c index 19d7b94d40c..4b0a4a8c984 100644 --- a/drivers/acpi/namespace/nseval.c +++ b/drivers/acpi/namespace/nseval.c @@ -1,7 +1,6 @@ /******************************************************************************* * - * Module Name: nseval - Object evaluation interfaces -- includes control - * method lookup and execution. + * Module Name: nseval - Object evaluation, includes control method execution * ******************************************************************************/ @@ -50,196 +49,14 @@ #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nseval") -/* Local prototypes */ -static acpi_status -acpi_ns_execute_control_method(struct acpi_parameter_info *info); - -static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info); - -/******************************************************************************* - * - * FUNCTION: acpi_ns_evaluate_relative - * - * PARAMETERS: Pathname - Name of method to execute, If NULL, the - * handle is the object to execute - * Info - Method info block, contains: - * return_object - Where to put method's return value (if - * any). If NULL, no value is returned. - * Params - List of parameters to pass to the method, - * terminated by NULL. Params itself may be - * NULL if no parameters are being passed. - * - * RETURN: Status - * - * DESCRIPTION: Evaluate the object or find and execute the requested method - * - * MUTEX: Locks Namespace - * - ******************************************************************************/ - -acpi_status -acpi_ns_evaluate_relative(char *pathname, struct acpi_parameter_info *info) -{ - acpi_status status; - struct acpi_namespace_node *node = NULL; - union acpi_generic_state *scope_info; - char *internal_path = NULL; - - ACPI_FUNCTION_TRACE("ns_evaluate_relative"); - - /* - * Must have a valid object handle - */ - if (!info || !info->node) { - return_ACPI_STATUS(AE_BAD_PARAMETER); - } - - /* Build an internal name string for the method */ - - status = acpi_ns_internalize_name(pathname, &internal_path); - if (ACPI_FAILURE(status)) { - return_ACPI_STATUS(status); - } - - scope_info = acpi_ut_create_generic_state(); - if (!scope_info) { - goto cleanup1; - } - - /* Get the prefix handle and Node */ - - status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); - if (ACPI_FAILURE(status)) { - goto cleanup; - } - - info->node = acpi_ns_map_handle_to_node(info->node); - if (!info->node) { - (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - status = AE_BAD_PARAMETER; - goto cleanup; - } - - /* Lookup the name in the namespace */ - - scope_info->scope.node = info->node; - status = acpi_ns_lookup(scope_info, internal_path, ACPI_TYPE_ANY, - ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL, - &node); - - (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - - if (ACPI_FAILURE(status)) { - ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Object [%s] not found [%s]\n", - pathname, acpi_format_exception(status))); - goto cleanup; - } - - /* - * Now that we have a handle to the object, we can attempt to evaluate it. - */ - ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", - pathname, node, acpi_ns_get_attached_object(node))); - - info->node = node; - status = acpi_ns_evaluate_by_handle(info); - - ACPI_DEBUG_PRINT((ACPI_DB_NAMES, - "*** Completed eval of object %s ***\n", pathname)); - - cleanup: - acpi_ut_delete_generic_state(scope_info); - - cleanup1: - ACPI_MEM_FREE(internal_path); - return_ACPI_STATUS(status); -} - /******************************************************************************* * - * FUNCTION: acpi_ns_evaluate_by_name + * FUNCTION: acpi_ns_evaluate * - * PARAMETERS: Pathname - Fully qualified pathname to the object - * Info - Method info block, contains: - * return_object - Where to put method's return value (if - * any). If NULL, no value is returned. - * Params - List of parameters to pass to the method, - * terminated by NULL. Params itself may be - * NULL if no parameters are being passed. - * - * RETURN: Status - * - * DESCRIPTION: Evaluate the object or rind and execute the requested method - * passing the given parameters - * - * MUTEX: Locks Namespace - * - ******************************************************************************/ - -acpi_status -acpi_ns_evaluate_by_name(char *pathname, struct acpi_parameter_info *info) -{ - acpi_status status; - char *internal_path = NULL; - - ACPI_FUNCTION_TRACE("ns_evaluate_by_name"); - - /* Build an internal name string for the method */ - - status = acpi_ns_internalize_name(pathname, &internal_path); - if (ACPI_FAILURE(status)) { - return_ACPI_STATUS(status); - } - - status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); - if (ACPI_FAILURE(status)) { - goto cleanup; - } - - /* Lookup the name in the namespace */ - - status = acpi_ns_lookup(NULL, internal_path, ACPI_TYPE_ANY, - ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL, - &info->node); - - (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - - if (ACPI_FAILURE(status)) { - ACPI_DEBUG_PRINT((ACPI_DB_NAMES, - "Object at [%s] was not found, status=%.4X\n", - pathname, status)); - goto cleanup; - } - - /* - * Now that we have a handle to the object, we can attempt to evaluate it. - */ - ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", - pathname, info->node, - acpi_ns_get_attached_object(info->node))); - - status = acpi_ns_evaluate_by_handle(info); - - ACPI_DEBUG_PRINT((ACPI_DB_NAMES, - "*** Completed eval of object %s ***\n", pathname)); - - cleanup: - - /* Cleanup */ - - if (internal_path) { - ACPI_MEM_FREE(internal_path); - } - - return_ACPI_STATUS(status); -} - -/******************************************************************************* - * - * FUNCTION: acpi_ns_evaluate_by_handle - * - * PARAMETERS: Info - Method info block, contains: - * Node - Method/Object Node to execute + * PARAMETERS: Info - Evaluation info block, contains: + * prefix_node - Prefix or Method/Object Node to execute + * Pathname - Name of method to execute, If NULL, the + * Node is the object to execute * Parameters - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. @@ -248,29 +65,21 @@ acpi_ns_evaluate_by_name(char *pathname, struct acpi_parameter_info *info) * parameter_type - Type of Parameter list * return_object - Where to put method's return value (if * any). If NULL, no value is returned. + * Flags - ACPI_IGNORE_RETURN_VALUE to delete return * * RETURN: Status * - * DESCRIPTION: Evaluate object or execute the requested method passing the - * given parameters + * DESCRIPTION: Execute a control method or return the current value of an + * ACPI namespace object. * - * MUTEX: Locks Namespace + * MUTEX: Locks interpreter * ******************************************************************************/ - -acpi_status acpi_ns_evaluate_by_handle(struct acpi_parameter_info *info) +acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info) { acpi_status status; - ACPI_FUNCTION_TRACE("ns_evaluate_by_handle"); - - /* Check if namespace has been initialized */ - - if (!acpi_gbl_root_node) { - return_ACPI_STATUS(AE_NO_NAMESPACE); - } - - /* Parameter Validation */ + ACPI_FUNCTION_TRACE(ns_evaluate); if (!info) { return_ACPI_STATUS(AE_BAD_PARAMETER); @@ -280,202 +89,120 @@ acpi_status acpi_ns_evaluate_by_handle(struct acpi_parameter_info *info) info->return_object = NULL; - /* Get the prefix handle and Node */ - - status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + /* + * Get the actual namespace node for the target object. Handles these cases: + * + * 1) Null node, Pathname (absolute path) + * 2) Node, Pathname (path relative to Node) + * 3) Node, Null Pathname + */ + status = acpi_ns_get_node(info->prefix_node, info->pathname, + ACPI_NS_NO_UPSEARCH, &info->resolved_node); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } - info->node = acpi_ns_map_handle_to_node(info->node); - if (!info->node) { - (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - return_ACPI_STATUS(AE_BAD_PARAMETER); - } - /* * For a method alias, we must grab the actual method node so that proper * scoping context will be established before execution. */ - if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) { - info->node = + if (acpi_ns_get_type(info->resolved_node) == + ACPI_TYPE_LOCAL_METHOD_ALIAS) { + info->resolved_node = ACPI_CAST_PTR(struct acpi_namespace_node, - info->node->object); + info->resolved_node->object); } + ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->pathname, + info->resolved_node, + acpi_ns_get_attached_object(info->resolved_node))); + /* * Two major cases here: - * 1) The object is an actual control method -- execute it. - * 2) The object is not a method -- just return it's current value * - * In both cases, the namespace is unlocked by the acpi_ns* procedure + * 1) The object is a control method -- execute it + * 2) The object is not a method -- just return it's current value */ - if (acpi_ns_get_type(info->node) == ACPI_TYPE_METHOD) { - /* - * Case 1) We have an actual control method to execute - */ - status = acpi_ns_execute_control_method(info); - } else { + if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) { /* - * Case 2) Object is NOT a method, just return its current value + * 1) Object is a control method - execute it */ - status = acpi_ns_get_object_value(info); - } - - /* - * Check if there is a return value on the stack that must be dealt with - */ - if (status == AE_CTRL_RETURN_VALUE) { - /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ - - status = AE_OK; - } - - /* - * Namespace was unlocked by the handling acpi_ns* function, so we - * just return - */ - return_ACPI_STATUS(status); -} - -/******************************************************************************* - * - * FUNCTION: acpi_ns_execute_control_method - * - * PARAMETERS: Info - Method info block, contains: - * Node - Method Node to execute - * obj_desc - Method object - * Parameters - List of parameters to pass to the method, - * terminated by NULL. Params itself may be - * NULL if no parameters are being passed. - * return_object - Where to put method's return value (if - * any). If NULL, no value is returned. - * parameter_type - Type of Parameter list - * return_object - Where to put method's return value (if - * any). If NULL, no value is returned. - * - * RETURN: Status - * - * DESCRIPTION: Execute the requested method passing the given parameters - * - * MUTEX: Assumes namespace is locked - * - ******************************************************************************/ - -static acpi_status -acpi_ns_execute_control_method(struct acpi_parameter_info *info) -{ - acpi_status status; - - ACPI_FUNCTION_TRACE("ns_execute_control_method"); - - /* Verify that there is a method associated with this object */ - - info->obj_desc = acpi_ns_get_attached_object(info->node); - if (!info->obj_desc) { - ACPI_ERROR((AE_INFO, "No attached method object")); - (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - return_ACPI_STATUS(AE_NULL_OBJECT); - } - - ACPI_DUMP_PATHNAME(info->node, "Execute Method:", - ACPI_LV_INFO, _COMPONENT); - - ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Method at AML address %p Length %X\n", - info->obj_desc->method.aml_start + 1, - info->obj_desc->method.aml_length - 1)); - - /* - * Unlock the namespace before execution. This allows namespace access - * via the external Acpi* interfaces while a method is being executed. - * However, any namespace deletion must acquire both the namespace and - * interpreter locks to ensure that no thread is using the portion of the - * namespace that is being deleted. - */ - status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - if (ACPI_FAILURE(status)) { - return_ACPI_STATUS(status); - } + /* Verify that there is a method object associated with this node */ - /* - * Execute the method via the interpreter. The interpreter is locked - * here before calling into the AML parser - */ - status = acpi_ex_enter_interpreter(); - if (ACPI_FAILURE(status)) { - return_ACPI_STATUS(status); - } + info->obj_desc = + acpi_ns_get_attached_object(info->resolved_node); + if (!info->obj_desc) { + ACPI_ERROR((AE_INFO, + "Control method has no attached sub-object")); + return_ACPI_STATUS(AE_NULL_OBJECT); + } - status = acpi_ps_execute_method(info); - acpi_ex_exit_interpreter(); + ACPI_DUMP_PATHNAME(info->resolved_node, "Execute Method:", + ACPI_LV_INFO, _COMPONENT); - return_ACPI_STATUS(status); -} + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "Method at AML address %p Length %X\n", + info->obj_desc->method.aml_start + 1, + info->obj_desc->method.aml_length - 1)); -/******************************************************************************* - * - * FUNCTION: acpi_ns_get_object_value - * - * PARAMETERS: Info - Method info block, contains: - * Node - Object's NS node - * return_object - Where to put object value (if - * any). If NULL, no value is returned. - * - * RETURN: Status - * - * DESCRIPTION: Return the current value of the object - * - * MUTEX: Assumes namespace is locked, leaves namespace unlocked - * - ******************************************************************************/ + /* + * Any namespace deletion must acquire both the namespace and + * interpreter locks to ensure that no thread is using the portion of + * the namespace that is being deleted. + * + * Execute the method via the interpreter. The interpreter is locked + * here before calling into the AML parser + */ + status = acpi_ex_enter_interpreter(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } -static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info) -{ - acpi_status status = AE_OK; - struct acpi_namespace_node *resolved_node = info->node; + status = acpi_ps_execute_method(info); + acpi_ex_exit_interpreter(); + } else { + /* + * 2) Object is not a method, return its current value + */ - ACPI_FUNCTION_TRACE("ns_get_object_value"); + /* + * Objects require additional resolution steps (e.g., the Node may be + * a field that must be read, etc.) -- we can't just grab the object + * out of the node. + * + * Use resolve_node_to_value() to get the associated value. + * + * NOTE: we can get away with passing in NULL for a walk state because + * resolved_node is guaranteed to not be a reference to either a method + * local or a method argument (because this interface is never called + * from a running method.) + * + * Even though we do not directly invoke the interpreter for object + * resolution, we must lock it because we could access an opregion. + * The opregion access code assumes that the interpreter is locked. + */ + status = acpi_ex_enter_interpreter(); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } - /* - * Objects require additional resolution steps (e.g., the Node may be a - * field that must be read, etc.) -- we can't just grab the object out of - * the node. - */ + /* Function has a strange interface */ - /* - * Use resolve_node_to_value() to get the associated value. This call always - * deletes obj_desc (allocated above). - * - * NOTE: we can get away with passing in NULL for a walk state because - * obj_desc is guaranteed to not be a reference to either a method local or - * a method argument (because this interface can only be called from the - * acpi_evaluate external interface, never called from a running method.) - * - * Even though we do not directly invoke the interpreter for this, we must - * enter it because we could access an opregion. The opregion access code - * assumes that the interpreter is locked. - * - * We must release the namespace lock before entering the intepreter. - */ - status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); - if (ACPI_FAILURE(status)) { - return_ACPI_STATUS(status); - } + status = + acpi_ex_resolve_node_to_value(&info->resolved_node, NULL); + acpi_ex_exit_interpreter(); - status = acpi_ex_enter_interpreter(); - if (ACPI_SUCCESS(status)) { - status = acpi_ex_resolve_node_to_value(&resolved_node, NULL); /* * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed * in resolved_node. */ - acpi_ex_exit_interpreter(); - if (ACPI_SUCCESS(status)) { status = AE_CTRL_RETURN_VALUE; - info->return_object = ACPI_CAST_PTR - (union acpi_operand_object, resolved_node); + info->return_object = + ACPI_CAST_PTR(union acpi_operand_object, + info->resolved_node); + ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returning object %p [%s]\n", info->return_object, @@ -484,7 +211,30 @@ static acpi_status acpi_ns_get_object_value(struct acpi_parameter_info *info) } } - /* Namespace is unlocked */ + /* + * Check if there is a return value that must be dealt with + */ + if (status == AE_CTRL_RETURN_VALUE) { + + /* If caller does not want the return value, delete it */ + if (info->flags & ACPI_IGNORE_RETURN_VALUE) { + acpi_ut_remove_reference(info->return_object); + info->return_object = NULL; + } + + /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ + + status = AE_OK; + } + + ACPI_DEBUG_PRINT((ACPI_DB_NAMES, + "*** Completed evaluation of object %s ***\n", + info->pathname)); + + /* + * Namespace was unlocked by the handling acpi_ns* function, so we + * just return + */ return_ACPI_STATUS(status); } |