On 2020-06-04 15:29, Cornelia Huck wrote:
On Thu, 4 Jun 2020 14:46:05 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:
On 2020-05-27 11:42, Cornelia Huck wrote:
On Mon, 18 May 2020 18:07:28 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:
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
- 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.
- If the subchannel is not enabled retry a predefined retries count.
This tests the MSCH instruction to enable a channel succesfuly.
This is NOT a routine to really enable the channel, no retry is done,
in case of error, a report is made.
Hm... so you retry if the subchannel is not enabled after cc 0, but you
don't retry if the cc indicates busy/status pending? Makes sense, as we
don't expect the subchannel to be busy, but a more precise note in the
patch description would be good :)
OK, I add something like
"
- If the command succeed but subchannel is not enabled retry a
s/succeed/succeeds/ :)
predefined retries count.
- If the command fails, report the failure and do not retry, even
if cc indicates a busy/status as we do not expect this.
"indicates busy/status pending" ?
"
done, thanks,
Pierre
--
Pierre Morel
IBM Lab Boeblingen
