evrgnini.c

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static u8 acpi_ev_match_pci_root_bridge(char *id)
{

	/*
	 * Check if this is a PCI root.
	 * ACPI 3.0+: check for a PCI Express root also.
	 */
	if (!(ACPI_STRNCMP(id,
			   PCI_ROOT_HID_STRING,
			   sizeof(PCI_ROOT_HID_STRING))) ||
	    !(ACPI_STRNCMP(id,
			   PCI_EXPRESS_ROOT_HID_STRING,
			   sizeof(PCI_EXPRESS_ROOT_HID_STRING)))) {
		return (TRUE);
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_is_pci_root_bridge
 *
 * PARAMETERS:  Node            - Device node being examined
 *
 * RETURN:      TRUE if device is a PCI/PCI-Express Root Bridge
 *
 * DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
 *              examining the _HID and _CID for the device.
 *
 ******************************************************************************/

static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
{
	acpi_status status;
	struct acpica_device_id hid;
	struct acpi_compatible_id_list *cid;
	acpi_native_uint i;

	/*
	 * Get the _HID and check for a PCI Root Bridge
	 */
	status = acpi_ut_execute_HID(node, &hid);
	if (ACPI_FAILURE(status)) {
		return (FALSE);
	}

	if (acpi_ev_match_pci_root_bridge(hid.value)) {
		return (TRUE);
	}

	/*
	 * The _HID did not match.
	 * Get the _CID and check for a PCI Root Bridge
	 */
	status = acpi_ut_execute_CID(node, &cid);
	if (ACPI_FAILURE(status)) {
		return (FALSE);
	}

	/* Check all _CIDs in the returned list */

	for (i = 0; i < cid->count; i++) {
		if (acpi_ev_match_pci_root_bridge(cid->id[i].value)) {
			ACPI_FREE(cid);
			return (TRUE);
		}
	}

	ACPI_FREE(cid);
	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_pci_bar_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a pci_bAR operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_pci_bar_region_setup(acpi_handle handle,
			     u32 function,
			     void *handler_context, void **region_context)
{
	ACPI_FUNCTION_TRACE(ev_pci_bar_region_setup);

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_cmos_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Setup a CMOS operation region
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_cmos_region_setup(acpi_handle handle,
			  u32 function,
			  void *handler_context, void **region_context)
{
	ACPI_FUNCTION_TRACE(ev_cmos_region_setup);

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_default_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Default region initialization
 *
 ******************************************************************************/

acpi_status
acpi_ev_default_region_setup(acpi_handle handle,
			     u32 function,
			     void *handler_context, void **region_context)
{
	ACPI_FUNCTION_TRACE(ev_default_region_setup);

	if (function == ACPI_REGION_DEACTIVATE) {
		*region_context = NULL;
	} else {
		*region_context = handler_context;
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_initialize_region
 *
 * PARAMETERS:  region_obj      - Region we are initializing
 *              acpi_ns_locked  - Is namespace locked?
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initializes the region, finds any _REG methods and saves them
 *              for execution at a later time
 *
 *              Get the appropriate address space handler for a newly
 *              created region.
 *
 *              This also performs address space specific initialization.  For
 *              example, PCI regions must have an _ADR object that contains
 *              a PCI address in the scope of the definition.  This address is
 *              required to perform an access to PCI config space.
 *
 * MUTEX:       Interpreter should be unlocked, because we may run the _REG
 *              method for this region.
 *
 ******************************************************************************/

acpi_status
acpi_ev_initialize_region(union acpi_operand_object *region_obj,
			  u8 acpi_ns_locked)
{
	union acpi_operand_object *handler_obj;
	union acpi_operand_object *obj_desc;
	acpi_adr_space_type space_id;
	struct acpi_namespace_node *node;
	acpi_status status;
	struct acpi_namespace_node *method_node;
	acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
	union acpi_operand_object *region_obj2;

	ACPI_FUNCTION_TRACE_U32(ev_initialize_region, acpi_ns_locked);

	if (!region_obj) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (region_obj->common.flags & AOPOBJ_OBJECT_INITIALIZED) {
		return_ACPI_STATUS(AE_OK);
	}

	region_obj2 = acpi_ns_get_secondary_object(region_obj);
	if (!region_obj2) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	node = acpi_ns_get_parent_node(region_obj->region.node);
	space_id = region_obj->region.space_id;

	/* Setup defaults */

	region_obj->region.handler = NULL;
	region_obj2->extra.method_REG = NULL;
	region_obj->common.flags &= ~(AOPOBJ_SETUP_COMPLETE);
	region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;

	/* Find any "_REG" method associated with this region definition */

	status =
	    acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
				     &method_node);
	if (ACPI_SUCCESS(status)) {
		/*
		 * The _REG method is optional and there can be only one per region
		 * definition.  This will be executed when the handler is attached
		 * or removed
		 */
		region_obj2->extra.method_REG = method_node;
	}

	/*
	 * The following loop depends upon the root Node having no parent
	 * ie: acpi_gbl_root_node->parent_entry being set to NULL
	 */
	while (node) {

		/* Check to see if a handler exists */

		handler_obj = NULL;
		obj_desc = acpi_ns_get_attached_object(node);
		if (obj_desc) {

			/* Can only be a handler if the object exists */

			switch (node->type) {
			case ACPI_TYPE_DEVICE:

				handler_obj = obj_desc->device.handler;
				break;

			case ACPI_TYPE_PROCESSOR:

				handler_obj = obj_desc->processor.handler;
				break;

			case ACPI_TYPE_THERMAL:

				handler_obj = obj_desc->thermal_zone.handler;
				break;

			default:
				/* Ignore other objects */
				break;
			}

			while (handler_obj) {

				/* Is this handler of the correct type? */

				if (handler_obj->address_space.space_id ==
				    space_id) {

					/* Found correct handler */

					ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
							  "Found handler %p for region %p in obj %p\n",
							  handler_obj,
							  region_obj,
							  obj_desc));

					status =
					    acpi_ev_attach_region(handler_obj,
								  region_obj,
								  acpi_ns_locked);

					/*
					 * Tell all users that this region is usable by running the _REG
					 * method
					 */
					if (acpi_ns_locked) {
						status =
						    acpi_ut_release_mutex
						    (ACPI_MTX_NAMESPACE);
						if (ACPI_FAILURE(status)) {
							return_ACPI_STATUS
							    (status);
						}
					}

					status =
					    acpi_ev_execute_reg_method
					    (region_obj, 1);

					if (acpi_ns_locked) {
						status =
						    acpi_ut_acquire_mutex
						    (ACPI_MTX_NAMESPACE);
						if (ACPI_FAILURE(status)) {
							return_ACPI_STATUS
							    (status);
						}
					}

					return_ACPI_STATUS(AE_OK);
				}

				/* Try next handler in the list */

				handler_obj = handler_obj->address_space.next;
			}
		}

		/*
		 * This node does not have the handler we need;
		 * Pop up one level
		 */
		node = acpi_ns_get_parent_node(node);
	}

	/* If we get here, there is no handler for this region */

	ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
			  "No handler for RegionType %s(%X) (RegionObj %p)\n",
			  acpi_ut_get_region_name(space_id), space_id,
			  region_obj));

	return_ACPI_STATUS(AE_NOT_EXIST);
}