Commits
Steffen Maier committed 35e9111a1e5
scsi: zfcp: support SCSI_ADAPTER_RESET via scsi_host sysfs attribute host_reset
Make use of feature introduced with v3.2 commit 294436914454 ("[SCSI] scsi:
Added support for adapter and firmware reset"). The common code interface
was introduced for commit 95d31262b3c1 ("[SCSI] qla4xxx: Added support for
adapter and firmware reset").
$ echo adapter > /sys/class/scsi_host/host<N>/host_reset
Example trace record formatted with zfcpdbf from s390-tools:
Timestamp : ...
Area : REC
Subarea : 00
Level : 1
Exception : -
CPU ID : ..
Caller : 0x...
Record ID : 1 ZFCP_DBF_REC_TRIG
Tag : scshr_y SCSI sysfs host_reset yes
LUN : 0xffffffffffffffff none (invalid)
WWPN : 0x0000000000000000 none (invalid)
D_ID : 0x00000000 none (invalid)
Adapter status : 0x4500050b
Port status : 0x00000000 none (invalid)
LUN status : 0x00000000 none (invalid)
Ready count : 0x00000001
Running count : 0x00000000
ERP want : 0x04 ZFCP_ERP_ACTION_REOPEN_ADAPTER
ERP need : 0x04 ZFCP_ERP_ACTION_REOPEN_ADAPTER
This is the common code equivalent to the zfcp-specific
&dev_attr_adapter_failed.attr in zfcp_sysfs_adapter_attrs.attrs[]:
$ echo 0 > /sys/bus/ccw/drivers/zfcp/<devbusid>/failed
The unsupported case returns EOPNOTSUPP:
$ echo firmware > /sys/class/scsi_host/host<N>/host_reset
-bash: echo: write error: Operation not supported
Example trace record formatted with zfcpdbf from s390-tools:
Timestamp : ...
Area : SCSI
Subarea : 00
Level : 1
Exception : -
CPU ID : ..
Caller : 0x...
Record ID : 1
Tag : scshr_n SCSI sysfs host_reset no
Request ID : 0x0000000000000000 none (invalid)
SCSI ID : 0xffffffff none (invalid)
SCSI LUN : 0xffffffff none (invalid)
SCSI LUN high : 0xffffffff none (invalid)
SCSI result : 0xffffffa1 -EOPNOTSUPP==-95
SCSI retries : 0xff none (invalid)
SCSI allowed : 0xff none (invalid)
SCSI scribble : 0xffffffffffffffff none (invalid)
SCSI opcode : ffffffff ffffffff ffffffff ffffffff none (invalid)
FCP rsp inf cod: 0xff none (invalid)
FCP rsp IU : 00000000 00000000 00000000 00000000 none (invalid)
00000000 00000000
For any other invalid value, common code returns EINVAL without invoking
our callback:
$ echo foo > /sys/class/scsi_host/host<N>/host_reset
-bash: echo: write error: Invalid argument
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>