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
extened status word, 4 formats
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 occured, 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
Kernel Hackers Manual 2.6. July 2010 STRUCT IRB(9)
