css_schedule_reprobe() function calls the evaluation for CSS_EVAL_UNREG
which is specific to the idset of unregistered subchannels. This
evaluation was introduced because, previously, if the underlying device
become not-accessible, the subchannel was unregistered. But, in the recent
changes in cio,with the commit '2297791c s390/cio: dont unregister
subchannel from child-drivers', we no  longer unregister the subchannels
just because of a non-operational device. This allows to have subchannels
without any operational device connected on it. So, a css_schedule_reprobe
function on unregistered subchannel does not have any effect.

Change this functionality to evaluate the subchannels which does not
have a working path to the device. This could be due the erroneous
device or due to the erraneous path. Evaluate based on the values of OPM
and PAM&POM.
Here we introduced a new idset function,to keep I/O subchannels in the
idset when the last seen status indicates that the device has no working
path. A device has no working path if all available paths have been tried
without success.A failed I/O attempt on a path is indicated as a 0 bit
value in the POM mask. By looking at the POM mask bit values of available
paths (1 in PAM) that Linux is supposed to use (1 in vary mask OPM), we
can identify a non-working device as a device where the bit-wise and of
the PAM, POM and OPM mask return 0.

css_schedule_reprobe() is being used by dasd-driver and chsc-cio
component. dasd driver, when it detects a change in the pathgroup, invokes
the re-evaluation of the subchannel. And chsc-cio component upon a CRW
event, (resource accessibility event). In both the cases, it makes much
better sense to re-evalute the subchannel with no-valid path.
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reported-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Tested-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>