linux-toradex.git/drivers/s390/cio/chsc.h, branch v3.0.22

[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] chsc: use the global page to determine the chp desriptor

2010-10-25T14:10:18+00:00

chsc_determine_channel_path_desc is called by a wrapper
who allocates a response struct. The response data
is then memcpy'ed to this response struct by
chsc_determine_channel_path_desc.

Change chsc_determine_base_channel_path_desc to use the
global chsc_page and deliver it to the function doing
the actual chsc call. The channel path desriptor is
then directly read from the response data.

As a result we get rid of the additional allocation
for the response struct.

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

[S390] chsc: consolidate memory allocations

2010-10-25T14:10:18+00:00

Most wrappers around the channel subsystem call have their own logic
to allocate memory (with proper alignment) or use preallocated or
static memory. This patch converts most users of the channel
subsystem call to use the same preallocated page (proteced by a
spinlock).

Note: The sei_page which is used in our crw handler to call
"store event information" has to coexist, since
a) in crw context, while accessing the sei_page, sleeping is allowed
   (which will conflict with the spinlock protection of the chsc_page)
b) in crw context, while accessing the sei_page, channel subsystem
   calls are allowed (which itself would require the page).

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

[S390] chsc: initialization fixes

2010-10-25T14:10:18+00:00

This patch fixes:
 * kfree vs. free_page usage
 * structure definition for determine_css_characteristics
 * naming convention for the chsc init function
 * deregistration of crw handlers in the cleanup path

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

[S390] cio: CHSC SIOSL Support

2010-08-09T16:12:53+00:00

A Linux interface for the CHSC command
store-I/O-operation-status-and-initiate-logging (SIOSL).
Model-dependent logging within the channel subsystem can be invoked
via a helper function or a writable subchannel device attribute.

Signed-off-by: Michael Ernst 
Signed-off-by: Martin Schwidefsky

[S390] cio: move scsw helper functions to header file

2009-09-11T08:29:36+00:00

All scsw helper functions are very short and usage of them shouldn't
result in function calls. Therefore we move them to a separate header
file.
Also saves a lot of EXPORT_SYMBOLs.

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

[S390] pm: css bus power management callbacks

2009-06-16T08:31:09+00:00

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

[S390] cio: Export chsc_error_from_response().

2008-07-17T15:22:10+00:00

Make chsc_error_from_response() available to chsc callers outside
of chsc.c (namely qdio) to avoid duplicating error checking code.

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

[S390] cio: Add chsc subchannel driver.

2008-07-14T08:02:12+00:00

This patch adds a driver for subchannels of type chsc.

A device /dev/chsc is created which may be used to issue ioctls to:
- obtain information about the machine's I/O configuration
- dynamically change the machine's I/O configuration via
  asynchronous chsc commands

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

[S390] cio: Get rid of css_characteristics_avail.

2008-07-14T08:02:10+00:00

Checking for the validity of the css_*_characteristics is
superfluous since they stay 0 for non-successful scsc.

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