STRUCT IRB(9)                              The ccw bus                              STRUCT IRB(9)



NAME
       struct_irb - interruption response block

SYNOPSIS
       struct irb {
         union scsw scsw;
         union esw;
         __u8 ecw[32];
       };

MEMBERS
       scsw
           subchannel status word

       esw
           extended status word

       ecw[32]
           extended control word

DESCRIPTION
       The irb that is handed to the device driver when an interrupt occurs. For solicited
       interrupts, the common I/O layer already performs checks whether a field is valid; a field
       not being valid is always passed as 0. If a unit check occurred, ecw may contain sense
       data; this is retrieved by the common I/O layer itself if the device doesn't support
       concurrent sense (so that the device driver never needs to perform basic sene itself). For
       unsolicited interrupts, the irb is passed as-is (expect for sense data, if applicable).

AUTHOR
       Cornelia Huck <cornelia.huck AT de.com>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                             STRUCT IRB(9)