linux-toradex.git/drivers/s390/cio/device_ops.c, branch v3.11

s390/cio: make use of newly added format 1 channel-path data

2013-04-17T12:07:26+00:00

Make use of the stored copy of format 1 channel-path data instead
of querying the information every time the corresponding function
is called.

Reviewed-by: Sebastian Ott 
Signed-off-by: Peter Oberparleiter 
Signed-off-by: Martin Schwidefsky

s390: use ccw_device_get_schid

2012-11-23T10:14:28+00:00

Let the dasd driver and qdio use ccw_device_get_schid and
get rid of other similar functions.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390: Add a mechanism to get the subchannel id.

2012-11-23T10:14:28+00:00

This will be needed by the new virtio-ccw transport.

Signed-off-by: Cornelia Huck 
Signed-off-by: Martin Schwidefsky

[S390] cio: provide fake irb for transport mode IO

2011-12-01T12:32:18+00:00

If a driver wants to do command mode IO while CIO is doing
online path verification we ignore this request and provide
a fake irb when we are done and the driver can do IO again.

For transport mode IO we have no such mechanism, giving the
driver no other chance then to retry the action until we are
done. This is not very reliable.

Provide a fake irb for transport mode IO as well.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

[S390] cio: disallow driver io for known to be broken paths

2011-12-01T12:32:18+00:00

When a driver requests to do IO, we will adjust the mask of
paths to be used to exclude varied offline paths.

Drivers trying to do IO solely on paths which are online but some
way defective may lack the information to do proper error handling.

There is no reason to allow the usage of known to be broken paths.
Thus restrict the paths a ccw driver can use for IO to a subset of
the paths cio found usable (this also excludes offline paths).

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

[S390] get rid of unused variables

2011-05-23T08:24:28+00:00

Remove trivially unused variables as detected with -Wunused-but-set-variable.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] cio: obtain mdc value per channel path

2011-01-05T11:47:28+00:00

Add support to accumulate the number of 64K-bytes blocks all paths
to a device at least support for a transport command.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

[S390] cio: make steal lock procedure more robust

2009-12-07T11:51:32+00:00

An Unconditional Reserve + Release operation (steal lock) for a
boxed device may fail when encountering special error cases
(e.g. unit checks or path errors). Fix this by using the more
robust ccw_request infrastructure for performing the steal lock
CCW program.

Signed-off-by: Peter Oberparleiter 
Signed-off-by: Martin Schwidefsky

[S390] cio: split PGID settings and status

2009-12-07T11:51:31+00:00

Split setting (driver wants feature enabled) and status (feature
setup was successful) for PGID related ccw device features so that
setup errors can be detected. Previously, incorrectly handled setup
errors could in rare cases lead to erratic I/O behavior and
permanently unusuable devices.

Signed-off-by: Peter Oberparleiter 
Signed-off-by: Martin Schwidefsky

[S390] cio: remove intretry flag

2009-12-07T11:51:31+00:00

After changing all internal I/O functions to use the newly introduced
ccw request infrastructure, retries are handled automatically after a
clear operation. Therefore remove the internal retry flag and
associated code.

Signed-off-by: Peter Oberparleiter 
Signed-off-by: Martin Schwidefsky