evregion.c

h内核

			 */
			region_obj->region.handler = NULL;
			acpi_ut_remove_reference (handler_obj);

			return_VOID;
		}

		/* Walk the linked list of handlers */

		last_obj_ptr = &obj_desc->region.next;
		obj_desc = obj_desc->region.next;
	}

	/* If we get here, the region was not in the handler's region list */

	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
		"Cannot remove region %p from address handler %p\n",
		region_obj, handler_obj));

	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_attach_region
 *
 * PARAMETERS:  handler_obj         - Handler Object
 *              region_obj          - Region Object
 *              acpi_ns_is_locked   - Namespace Region Already Locked?
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create the association between the handler and the region
 *              this is a two way association.
 *
 ******************************************************************************/

acpi_status
acpi_ev_attach_region (
	union acpi_operand_object       *handler_obj,
	union acpi_operand_object       *region_obj,
	u8                              acpi_ns_is_locked)
{

	ACPI_FUNCTION_TRACE ("ev_attach_region");


	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
		"Adding Region [%4.4s] %p to address handler %p [%s]\n",
		acpi_ut_get_node_name (region_obj->region.node),
		region_obj, handler_obj,
		acpi_ut_get_region_name (region_obj->region.space_id)));

	/* Link this region to the front of the handler's list */

	region_obj->region.next = handler_obj->address_space.region_list;
	handler_obj->address_space.region_list = region_obj;

	/* Install the region's handler */

	if (region_obj->region.handler) {
		return_ACPI_STATUS (AE_ALREADY_EXISTS);
	}

	region_obj->region.handler = handler_obj;
	acpi_ut_add_reference (handler_obj);

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_handler
 *
 * PARAMETERS:  walk_namespace callback
 *
 * DESCRIPTION: This routine installs an address handler into objects that are
 *              of type Region or Device.
 *
 *              If the Object is a Device, and the device has a handler of
 *              the same type then the search is terminated in that branch.
 *
 *              This is because the existing handler is closer in proximity
 *              to any more regions than the one we are trying to install.
 *
 ******************************************************************************/

acpi_status
acpi_ev_install_handler (
	acpi_handle                     obj_handle,
	u32                             level,
	void                            *context,
	void                            **return_value)
{
	union acpi_operand_object       *handler_obj;
	union acpi_operand_object       *next_handler_obj;
	union acpi_operand_object       *obj_desc;
	struct acpi_namespace_node      *node;
	acpi_status                     status;


	ACPI_FUNCTION_NAME ("ev_install_handler");


	handler_obj = (union acpi_operand_object   *) context;

	/* Parameter validation */

	if (!handler_obj) {
		return (AE_OK);
	}

	/* Convert and validate the device handle */

	node = acpi_ns_map_handle_to_node (obj_handle);
	if (!node) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * We only care about regions.and objects
	 * that are allowed to have address space handlers
	 */
	if ((node->type != ACPI_TYPE_DEVICE) &&
		(node->type != ACPI_TYPE_REGION) &&
		(node != acpi_gbl_root_node)) {
		return (AE_OK);
	}

	/* Check for an existing internal object */

	obj_desc = acpi_ns_get_attached_object (node);
	if (!obj_desc) {
		/* No object, just exit */

		return (AE_OK);
	}

	/* Devices are handled different than regions */

	if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_DEVICE) {
		/* Check if this Device already has a handler for this address space */

		next_handler_obj = obj_desc->device.handler;
		while (next_handler_obj) {
			/* Found a handler, is it for the same address space? */

			if (next_handler_obj->address_space.space_id == handler_obj->address_space.space_id) {
				ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
					"Found handler for region [%s] in device %p(%p) handler %p\n",
					acpi_ut_get_region_name (handler_obj->address_space.space_id),
					obj_desc, next_handler_obj, handler_obj));

				/*
				 * Since the object we found it on was a device, then it
				 * means that someone has already installed a handler for
				 * the branch of the namespace from this device on.  Just
				 * bail out telling the walk routine to not traverse this
				 * branch.  This preserves the scoping rule for handlers.
				 */
				return (AE_CTRL_DEPTH);
			}

			/* Walk the linked list of handlers attached to this device */

			next_handler_obj = next_handler_obj->address_space.next;
		}

		/*
		 * As long as the device didn't have a handler for this
		 * space we don't care about it.  We just ignore it and
		 * proceed.
		 */
		return (AE_OK);
	}

	/* Object is a Region */

	if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
		/*
		 * This region is for a different address space
		 * -- just ignore it
		 */
		return (AE_OK);
	}

	/*
	 * Now we have a region and it is for the handler's address
	 * space type.
	 *
	 * First disconnect region for any previous handler (if any)
	 */
	acpi_ev_detach_region (obj_desc, FALSE);

	/* Connect the region to the new handler */

	status = acpi_ev_attach_region (handler_obj, obj_desc, FALSE);
	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_install_space_handler
 *
 * PARAMETERS:  Node            - Namespace node for the device
 *              space_id        - The address space ID
 *              Handler         - Address of the handler
 *              Setup           - Address of the setup function
 *              Context         - Value passed to the handler on each access
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
 *              Assumes namespace is locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_install_space_handler (
	struct acpi_namespace_node      *node,
	acpi_adr_space_type             space_id,
	acpi_adr_space_handler          handler,
	acpi_adr_space_setup            setup,
	void                            *context)
{
	union acpi_operand_object       *obj_desc;
	union acpi_operand_object       *handler_obj;
	acpi_status                     status;
	acpi_object_type                type;
	u16                             flags = 0;


	ACPI_FUNCTION_TRACE ("ev_install_space_handler");


	/*
	 * This registration is valid for only the types below
	 * and the root.  This is where the default handlers
	 * get placed.
	 */
	if ((node->type != ACPI_TYPE_DEVICE)     &&
		(node->type != ACPI_TYPE_PROCESSOR)  &&
		(node->type != ACPI_TYPE_THERMAL)    &&
		(node != acpi_gbl_root_node)) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	if (handler == ACPI_DEFAULT_HANDLER) {
		flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;

		switch (space_id) {
		case ACPI_ADR_SPACE_SYSTEM_MEMORY:
			handler = acpi_ex_system_memory_space_handler;
			setup   = acpi_ev_system_memory_region_setup;
			break;

		case ACPI_ADR_SPACE_SYSTEM_IO:
			handler = acpi_ex_system_io_space_handler;
			setup   = acpi_ev_io_space_region_setup;
			break;

		case ACPI_ADR_SPACE_PCI_CONFIG:
			handler = acpi_ex_pci_config_space_handler;
			setup   = acpi_ev_pci_config_region_setup;
			break;

		case ACPI_ADR_SPACE_CMOS:
			handler = acpi_ex_cmos_space_handler;
			setup   = acpi_ev_cmos_region_setup;
			break;

		case ACPI_ADR_SPACE_PCI_BAR_TARGET:
			handler = acpi_ex_pci_bar_space_handler;
			setup   = acpi_ev_pci_bar_region_setup;
			break;

		case ACPI_ADR_SPACE_DATA_TABLE:
			handler = acpi_ex_data_table_space_handler;
			setup   = NULL;
			break;

		default:
			status = AE_BAD_PARAMETER;
			goto unlock_and_exit;
		}
	}

	/* If the caller hasn't specified a setup routine, use the default */

	if (!setup) {
		setup = acpi_ev_default_region_setup;
	}

	/* Check for an existing internal object */

	obj_desc = acpi_ns_get_attached_object (node);
	if (obj_desc) {
		/*
		 * The attached device object already exists.
		 * Make sure the handler is not already installed.
		 */
		handler_obj = obj_desc->device.handler;

		/* Walk the handler list for this device */

		while (handler_obj) {
			/* Same space_id indicates a handler already installed */

			if (handler_obj->address_space.space_id == space_id) {
				if (handler_obj->address_space.handler == handler) {
					/*
					 * It is (relatively) OK to attempt to install the SAME
					 * handler twice. This can easily happen with PCI_Config space.
					 */
					status = AE_SAME_HANDLER;
					goto unlock_and_exit;
				}
				else {
					/* A handler is already installed */

					status = AE_ALREADY_EXISTS;
				}
				goto unlock_and_exit;
			}

			/* Walk the linked list of handlers */

			handler_obj = handler_obj->address_space.next;
		}
	}
	else {
		ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
			"Creating object on Device %p while installing handler\n", node));

		/* obj_desc does not exist, create one */

		if (node->type == ACPI_TYPE_ANY) {
			type = ACPI_TYPE_DEVICE;
		}
		else {
			type = node->type;
		}

		obj_desc = acpi_ut_create_internal_object (type);
		if (!obj_desc) {
			status = AE_NO_MEMORY;
			goto unlock_and_exit;
		}

		/* Init new descriptor */

		obj_desc->common.type = (u8) type;

		/* Attach the new object to the Node */

		status = acpi_ns_attach_object (node, obj_desc, type);

		/* Remove local reference to the object */

		acpi_ut_remove_reference (obj_desc);

		if (ACPI_FAILURE (status)) {
			goto unlock_and_exit;
		}
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
		"Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
		acpi_ut_get_region_name (space_id), space_id,
		acpi_ut_get_node_name (node), node, obj_desc));

	/*
	 * Install the handler
	 *
	 * At this point there is no existing handler.
	 * Just allocate the object for the handler and link it
	 * into the list.
	 */
	handler_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
	if (!handler_obj) {
		status = AE_NO_MEMORY;
		goto unlock_and_exit;
	}

	/* Init handler obj */

	handler_obj->address_space.space_id  = (u8) space_id;
	handler_obj->address_space.hflags    = flags;
	handler_obj->address_space.region_list = NULL;
	handler_obj->address_space.node      = node;
	handler_obj->address_space.handler   = handler;
	handler_obj->address_space.context   = context;
	handler_obj->address_space.setup     = setup;

	/* Install at head of Device.address_space list */

	handler_obj->address_space.next      = obj_desc->device.handler;

	/*
	 * The Device object is the first reference on the handler_obj.
	 * Each region that uses the handler adds a reference.
	 */
	obj_desc->device.handler = handler_obj;

	/*
	 * Walk the namespace finding all of the regions this
	 * handler will manage.
	 *
	 * Start at the device and search the branch toward
	 * the leaf nodes until either the leaf is encountered or
	 * a device is detected that has an address handler of the
	 * same type.
	 *
	 * In either case, back up and search down the remainder
	 * of the branch
	 */
	status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
			  ACPI_NS_WALK_UNLOCK, acpi_ev_install_handler,
			  handler_obj, NULL);

unlock_and_exit:
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_execute_reg_methods
 *
 * PARAMETERS:  Node            - Namespace node for the device
 *              space_id        - The address space ID
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Run all _REG methods for the input Space ID;
 *              Note: assumes namespace is locked, or system init time.
 *
 ******************************************************************************/

acpi_status
acpi_ev_execute_reg_methods (
	struct acpi_namespace_node      *node,
	acpi_adr_space_type             space_id)
{
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ev_execute_reg_methods");


	/*
	 * Run all _REG methods for all Operation Regions for this
	 * space ID.  This is a separate walk in order to handle any
	 * interdependencies between regions and _REG methods.  (i.e. handlers
	 * must be installed for all regions of this Space ID before we
	 * can run any _REG methods)
	 */
	status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
			  ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
			  &space_id, NULL);

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_reg_run
 *
 * PARAMETERS:  walk_namespace callback
 *
 * DESCRIPTION: Run _REg method for region objects of the requested space_iD
 *
 ******************************************************************************/

acpi_status
acpi_ev_reg_run (
	acpi_handle                     obj_handle,
	u32                             level,
	void                            *context,
	void                            **return_value)
{
	union acpi_operand_object       *obj_desc;
	struct acpi_namespace_node      *node;
	acpi_adr_space_type             space_id;
	acpi_status                     status;


	space_id = *ACPI_CAST_PTR (acpi_adr_space_type, context);

	/* Convert and validate the device handle */

	node = acpi_ns_map_handle_to_node (obj_handle);
	if (!node) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * We only care about regions.and objects
	 * that are allowed to have address space handlers
	 */
	if ((node->type != ACPI_TYPE_REGION) &&
		(node != acpi_gbl_root_node)) {
		return (AE_OK);
	}

	/* Check for an existing internal object */

	obj_desc = acpi_ns_get_attached_object (node);
	if (!obj_desc) {
		/* No object, just exit */

		return (AE_OK);
	}

	/* Object is a Region */

	if (obj_desc->region.space_id != space_id) {
		/*
		 * This region is for a different address space
		 * -- just ignore it
		 */
		return (AE_OK);
	}

	status = acpi_ev_execute_reg_method (obj_desc, 1);
	return (status);
}