struct_ccw_dev_id(9) centos man page | unix.com

STRUCT 
CCW_DEV_ID(9)						    The ccw bus 					      STRUCT CCW_DEV_ID(9)

NAME
       struct_ccw_dev_id - unique identifier for ccw devices

SYNOPSIS
       struct ccw_dev_id {
	 u8 ssid;
	 u16 devno;
       };

MEMBERS
       ssid
	   subchannel set id

       devno
	   device number

DESCRIPTION
       This structure is not directly based on any hardware structure. The hardware identifies a device by its device number and its subchannel,
       which is in turn identified by its id. In order to get a unique identifier for ccw devices across subchannel sets, struct ccw_dev_id has
       been introduced.

AUTHOR
       Cornelia Huck <cornelia.huck@de.ibm.com>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						      STRUCT CCW_DEV_ID(9)