z/VM: CP Commands and Utilities Reference - z/VM - IBM

TRACE I/O
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TRace
INTerrupt
Authorization
Purpose
Operands
I/O
IO
range
options
Instruction
Privilege Class: G
NOCCW
CCW
IODATA 8
IODATA
Use the TRACE I/O command to control virtual machine tracing of I/O events.
range
identifies a range of devices. The range may be expressed as a single device
number or pair of device numbers separated by a hyphen. (-), or a starting
device number followed by a period (.) and followed by a number representing
the number of consecutive device addresses to be traced. Wrap-around ranges
are not allowed.
Instruction
specifies tracing of I/O instructions for a TRACE I/O command. If neither
INSTRUCTION nor CCW nor INTERRUPT is specified, INSTRUCTION and
INTERRUPT are assumed.
NOCCW
specifies that CCWs are not to be displayed. NOCCW is assumed if CCW is
not specified.
CCW
specifies that CCWs are to be displayed with RIO, SIO, SIOF, SSCH, and
RSCH instructions that successfully start I/O.
IODATA nnnn
For CCWs handled by the Virtual Channel Simulator, IODATA specifies the
number of data bytes to be displayed for each CCW. nnnn can be up to 3800. If
nnnn is greater than 8, TRACE I/O will display nnnn bytes of data following the
CCW and prefixed with a hexadecimal offset:
nnnn
cp trace io 500 inst int ccw iodata 64
... (other SSCH / IO INT trace output) ...
VDEV 0500 CCW 72200080 00E58968 STS 00
DATA +000 D0010600 F0F0F1F7 F3F2F0F0 F5C9C2D4
DATA +010 E5D4F0F0 F0F0F0F0 F0F0F0F0 F0F00200
DATA +020 D0020000 F0F0F1F7 F3F1F0F0 F5C9C2D4
DATA +030 E5D4F0F0 F0F0F0F0 F0F0F0F0 F0F00200 STS 0C
SIM
specifies normal simulation of instructions. If neither SIM nor NOSIM is
specified, SIM is assumed.
SIM
NOSIM
TRACE I/O
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Chapter 2. CP Commands 1639