/*******************************************************************************
*
- * Module Name: nseval - Object evaluation, includes control method execution
+ * Module Name: nseval - Object evaluation interfaces -- includes control
+ * method lookup and execution.
*
******************************************************************************/
#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
+ * FUNCTION: acpi_ns_evaluate_by_name
*
- * 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: 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 - List of parameters to pass to the method,
* terminated by NULL. Params itself may be
* NULL if no parameters are being passed.
* 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: Execute a control method or return the current value of an
- * ACPI namespace object.
+ * DESCRIPTION: Evaluate object or execute the requested method passing the
+ * given parameters
*
- * MUTEX: Locks interpreter
+ * MUTEX: Locks Namespace
*
******************************************************************************/
-acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info)
+
+acpi_status acpi_ns_evaluate_by_handle(struct acpi_parameter_info *info)
{
acpi_status status;
- ACPI_FUNCTION_TRACE(ns_evaluate);
+ 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 */
if (!info) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
info->return_object = NULL;
- /*
- * 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);
+ /* Get the prefix handle and Node */
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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->resolved_node) ==
- ACPI_TYPE_LOCAL_METHOD_ALIAS) {
- info->resolved_node =
+ if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
+ info->node =
ACPI_CAST_PTR(struct acpi_namespace_node,
- info->resolved_node->object);
+ info->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 a control method -- execute it
+ * 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
*/
- if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) {
+ 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 {
/*
- * 1) Object is a control method - execute it
+ * Case 2) Object is NOT a method, just return its current value
*/
+ 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 */
- /* Verify that there is a method object associated with this node */
+ status = AE_OK;
+ }
- 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);
- }
+ /*
+ * 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
+ *
+ ******************************************************************************/
- ACPI_DUMP_PATHNAME(info->resolved_node, "Execute Method:",
- ACPI_LV_INFO, _COMPONENT);
+static acpi_status
+acpi_ns_execute_control_method(struct acpi_parameter_info *info)
+{
+ 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));
+ ACPI_FUNCTION_TRACE("ns_execute_control_method");
- /*
- * 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);
- }
+ /* Verify that there is a method associated with this object */
- status = acpi_ps_execute_method(info);
- acpi_ex_exit_interpreter();
- } else {
- /*
- * 2) Object is not a method, return its current value
- */
+ info->obj_desc = acpi_ns_get_attached_object(info->node);
+ if (!info->obj_desc) {
+ ACPI_ERROR((AE_INFO, "No attached method object"));
- /*
- * 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);
- }
+ (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+ return_ACPI_STATUS(AE_NULL_OBJECT);
+ }
- /* Function has a strange interface */
+ ACPI_DUMP_PATHNAME(info->node, "Execute Method:",
+ ACPI_LV_INFO, _COMPONENT);
- status =
- acpi_ex_resolve_node_to_value(&info->resolved_node, NULL);
- acpi_ex_exit_interpreter();
+ 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);
+ }
+
+ /*
+ * 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);
+ }
+
+ status = acpi_ps_execute_method(info);
+ acpi_ex_exit_interpreter();
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * 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
+ *
+ ******************************************************************************/
+
+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;
+
+ 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. 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_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,
- info->resolved_node);
-
+ info->return_object = ACPI_CAST_PTR
+ (union acpi_operand_object, resolved_node);
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Returning object %p [%s]\n",
info->return_object,
}
}
- /*
- * 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 */
+ /* Namespace is unlocked */
- 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);
}
git://git.onelab.eu / linux-2.6.git / blobdiff