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

s390/cio: fix early init counter usage

2013-04-17T12:07:33+00:00

Via ccw_device_init_count we keep track of how many devices are in
asynchronous device recognition/initialization. For early devices this
variable was not only used prior to its initialization but used
incorrectly (incremented but never decremented). Fix this by using static
initialization for this variable (and friends), make them visible to
device.c only, and decrement the counter after recognition of early
devices is finished.

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

s390/cio: get rid of static console device

2013-04-17T12:07:32+00:00

Remove the static console ccw device (and friends) and use dynamic
allocation for these structures. With this change the console
device is treated (mostly) like any other ccw device and we can
remove some special cases.

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

s390/cio: get rid of static console subchannel

2013-04-17T12:07:32+00:00

Remove the static console subchannel (and friends) and use dynamic
allocation for these structures. With this change the console
subchanel is treated (mostly) like any other subchannel and we can
remove some special cases.

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

s390/cio: ccw_device_force_console don't use static variable

2013-04-17T12:07:31+00:00

force_console is used to wake up the CCW based console device to
print a panic message in case something goes wrong in a suspend
or resume cycle. Stop using the static console_subchannel and add
a parameter to this function to specify which ccw device we have
to wake up.

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

s390/cio: wait_cons_dev don't use static variable

2013-04-17T12:07:30+00:00

wait_cons_dev is used to busy wait for an interrupt on the console
ccw device. Stop using the static console_subchannel and add a
parameter to this function to specify on which ccw device/subchannel
we have to do the polling.

While at it rename the function to ccw_device_wait_idle and
move it to device.c

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

s390/cio: export vpm via sysfs

2013-02-14T14:55:08+00:00

Add new attribute "vpm" to the subchannel sysfs directory of I/O
subchannels. This attribute contains a path mask indicating which
channel paths were successfully verified to be usable for I/O.

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

s390/irq: remove split irq fields from /proc/stat

2013-01-08T09:57:07+00:00

Now that irq sum accounting for /proc/stat's "intr" line works again we
have the oddity that the sum field (first field) contains only the sum
of the second (external irqs) and third field (I/O interrupts).
The reason for that is that these two fields are already sums of all other
fields. So if we would sum up everything we would count every interrupt
twice.
This is broken since the split interrupt accounting was merged two years
ago: 052ff461c8427629aee887ccc27478fc7373237c "[S390] irq: have detailed
statistics for interrupt types".
To fix this remove the split interrupt fields from /proc/stat's "intr"
line again and only have them in /proc/interrupts.

This restores the old behaviour, seems to be the only sane fix and mimics
a behaviour from other architectures where /proc/interrupts also contains
more than /proc/stat's "intr" line does.

Signed-off-by: Heiko Carstens 
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/cio: suppress 2nd path verification during resume

2012-10-26T14:44:22+00:00

Do not trigger a path verification in the subchannel event
function during resume from hibernate. This will be started
by the pm_restore callback later.

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

s390/cio: invalidate cdev pointer before deregistration

2012-09-06T08:40:40+00:00

Make sure that the cdev pointer for IO subchannels is set to NULL when
we deregister the device (and release its last reference). This will
fix a bug were another process operates on an already freed ccw device.

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