s390x: css: msch, enable test

A second step when testing the channel subsystem is to prepare a channel
for use.
This includes:
- Get the current subchannel Information Block (SCHIB) using STSCH
- Up

s390x: css: msch, enable test

A second step when testing the channel subsystem is to prepare a channel
for use.
This includes:
- Get the current subchannel Information Block (SCHIB) using STSCH
- Update it in memory to set the ENABLE bit and the specified ISC
- Tell the CSS that the SCHIB has been modified using MSCH
- Get the SCHIB from the CSS again to verify that the subchannel is
enabled and uses the specified ISC.
- If the command succeeds but subchannel is not enabled or the ISC
field is not as expected, retry a predefined retries count.
- If the command fails, report the failure and do not retry, even
if cc indicates a busy/status pending as we do not expect this.

This tests the MSCH instruction to enable a channel successfully.
Retries are done and in case of error, and if the retries count
is exceeded, a report is made.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1594887809-10521-9-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

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s390x: css: stsch, enumeration test

First step for testing the channel subsystem is to enumerate the css and
retrieve the css devices.

We currently don't enable multiple subchannel sets and therefo

s390x: css: stsch, enumeration test

First step for testing the channel subsystem is to enumerate the css and
retrieve the css devices.

We currently don't enable multiple subchannel sets and therefore only
look in subchannel set 0

This tests the success of STSCH I/O instruction, we do not test the
reaction of the VM for an instruction with wrong parameters.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1594904550-32273-2-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

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