evregion.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 1,056 行 · 第 1/2 页

						(region_obj->region.space_id)));
			}

			region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);

			/*
			 * Remove handler reference in the region
			 *
			 * NOTE: this doesn't mean that the region goes away
			 * The region is just inaccessible as indicated to
			 * the _REG method
			 *
			 * If the region is on the handler's list
			 * this better be the region's handler
			 */
			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.
 *
 ******************************************************************************/

static 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
 *
 ******************************************************************************/

static 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);
}