linux-toradex.git/drivers/s390/cio/device_status.c, branch v3.0.43

[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

[S390] cio: introduce cio_update_schib

2008-12-25T12:39:10+00:00

There is the chance that we get condition code 0 for a stsch but
the resulting schib is not vaild. In the current code there are
2 cases:
* we do a check for validity of the schib after stsch, but at this
  time we have already stored the invaild schib in the subchannel
  structure. This may lead to problems.
* we don't do a check for validity, which is not that good either.

The patch addresses both issues by introducing the stsch wrapper
cio_update_schib which performs stsch on a local schib. This schib
is only written back to the subchannel if it's valid.

side note: For some functions (chp_events) the return codes are
different now (-ENXIO vs -ENODEV) but this shouldn't do harm
since the caller doesn't check for _specific_ errors.

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

[S390] cio: introduce fcx enabled scsw format

2008-07-14T08:02:07+00:00

Extend the scsw data structure to the format required by fcx. Also
provide helper functions for easier access to fields which are present
in both the traditional as well as the modified format.

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

[S390] replace remaining FUNCTION occurrences

2008-04-17T05:47:04+00:00

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison 
Signed-off-by: Andrew Morton 
Signed-off-by: Martin Schwidefsky 
Signed-off-by: Heiko Carstens

[S390] cio: Trigger verification on device/path not operational.

2008-04-17T05:46:57+00:00

Currently, we don't do much on no path or no device situations during
normal user I/O, since we rely on reports regarding those events by
the machine. If we trigger a path verification to bring our device
state up-to-date, we (a) may recover from path failures earlier and
(b) better handle situations where the hardware/hypervisor doesn't
give us enough notifications.

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

[S390] cio: Introduce subchannel->private.

2008-01-26T13:10:59+00:00

Introduce a private pointer in struct subchannel to store
per-subchannel type data (cannot use dev->priv since this
is already used for something else).

Create a new header io_sch.h for I/O subchannel specific structures
and instructions.

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

[S390] cio: Fix handling of interrupt for csch().

2007-04-04T12:37:39+00:00

Wipe internal irb if the clear function bit is set before accumulating
bits from the irb in order to follow hardware behaviour.

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

[S390] cio: Device status validity.

2007-03-26T18:43:47+00:00

Only accumulate device status field in irb if it is valid.

Cc: Martin Schwidefsky 
Signed-off-by: Cornelia Huck 
Signed-off-by: Heiko Carstens

[S390] Avoid excessive inlining.

2007-02-05T20:18:53+00:00

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

[S390] cio: Retry internal operations after vary off.

2006-12-04T14:41:04+00:00

If I/O was running on a just varied off chpid, it will be terminated.
If this was a common I/O layer internal I/O, it needs to be retried.

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