linux-toradex.git/drivers/s390/cio/qdio.h, branch v3.2.20

[S390] qdio: prevent dsci access without adapter interrupts

2011-10-30T14:16:47+00:00

A kernel panic may occur during sending or receiving network packets
on a machine without adapter interrupts since commit d36deae.
The bug is triggered by writing to the shared indicator address which
is set to 0 if the machine doesn't have adapter interrupts.

Make the reading and setting of the shared indicator dependent on the
adapter interrupt feature and while at it move the code to the
file containing the adapter interrupt related code.

Thanks to Jan Jaeger for tracking this down.

Reported-by: Jan Jaeger 
Tested-by: Jan Jaeger 
Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: remove multicast polling

2011-10-30T14:16:45+00:00

The multicast poll check for the outbound queue is redundant since
3d6c76f "[S390] qdio: outbound tasklet scan threshold". Remove the check.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: add timestamp for last queue scan time

2011-10-30T14:16:45+00:00

Add a timestamp per queue and update the timestamp when the queue is
scanned. Add the queue timestamps and the timestamp of the last
adapter interrupt to the debugfs output. The timestamps are useful
for debugging stall conditions.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

qdio: support forced signal adapter indications

2011-08-13T08:10:16+00:00

This patch ensures that signal adapter commands are issued if they are
indicated to be required.

Signed-off-by: Einar Lueck 
Signed-off-by: Jan Glauber 
Signed-off-by: Frank Blaschka 
Signed-off-by: David S. Miller

qdio: support asynchronous delivery of storage blocks

2011-08-13T08:10:16+00:00

This patch introduces support for asynchronous delivery of storage blocks for
Hipersockets. Upper layers may exploit this functionality to reuse SBALs for
which the delivery status is still pending.

Signed-off-by: Einar Lueck 
Signed-off-by: Jan Glauber 
Signed-off-by: Frank Blaschka 
Signed-off-by: David S. Miller

[S390] qdio: 2nd stage retry on SIGA-W busy conditions

2011-08-03T14:44:19+00:00

The SIGA-W may return with the busy bit set which means the device was
blocked. The busy loop which retries the SIGA-W for 100us may not be
long enough when running under a heavily loaded hypervisor.

Extend the retry mechanism by adding a longer second stage which retries
the SIGA-W for up to 10s. In difference to the first retry loop the second
stage is using mdelay to stop the cpu between the retries and thereby
avoid additional preassure in on the hypervisor.
If the second stage retry is successfull a device reset is avoided.

Signed-off-by: Jan Glauber 
Signed-off-by: Heiko Carstens

[S390] qdio: cleanup SIGA sync

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

Simplify the SIGA sync code and add unlikely annotations. In polling mode
SBALs may be accessed without interrupt, so call SIGA sync before every scan.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: remove enhanced SIGA

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

HiperSocket devices only use one SBAL per qdio call without the enhanced SIGA
feature. Since that feature is currently not used remove it from the qdio code
so the compiler can generate better code for the HiperSocket outbound path.
While at it mark the SIGA error conditions as unlikely.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: use proper QEBSM operand for SIGA-R and SIGA-S

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

If QIOASSIST is enabled for a qdio device the SIGA instruction requires
a modified function code. This function code modifier was missing for
SIGA-R and SIGA-S which can lead to a kernel panic caused by an
operand exception.

Cc: stable@kernel.org
Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: outbound queue full counter

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

Add a counter for outbound queue full events to the qdio statistics.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky