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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;
};

MEMBERS

union scsw scsw
subchannel status word

union esw

extended status word

__u8 ecw

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@de.ibm.com>
Author.

COPYRIGHT

September 2017 Kernel Hackers Manual 4.12