linux-toradex.git/arch/s390/kernel, branch v2.6.32

[S390] s390: fix single stepping on svc0

2009-11-13T14:45:03+00:00

On s390 there are two ways of specifying the system call number for
the svc instruction. The standard way is to use the immediate field
in the instruction (or to use EXecute for values unknown during
assemble time). This can encode 256 system calls.
The kernel ABI also allows to put the system call number in r1 and
then execute svc 0 to enable system call numbers > 255.

It turns out that single stepping svc 0 is broken, since the PER
program check handler uses r1. We have to use a different register.

Signed-off-by: Christian Borntraeger 
Signed-off-by: Martin Schwidefsky

[S390] reset cputime accounting after IPL from NSS

2009-11-13T14:45:03+00:00

After an IPL from NSS the uptime of the system is incorrect. The reason
is that the startup code in head.S is not executed in case of an IPL
from NSS. Due to that sched_clock_base_cc which is used to initialze
wall_to_monotonic contains the time stamp when the NSS has been created
instead of the time stamp of the system start.

Reinitialize the cputime accounting values in create_kernel_nss after
the SAVESYS CP command that created the NSS segment.

Signed-off-by: Martin Schwidefsky

[S390] smp: fix sigp sense handling

2009-10-29T14:05:13+00:00

sigp sense only returns the status of a cpu if it is non zero. If the
status of the sensed cpu is all zeros condition code 0 (accpeted) is
set and no status bits are returned.
The current code however assumes that a status was returned and tests
bits in it. This means uninitalized data is accessed with random
results.
Worst case is that the code that checks if cpu is offline on cpu
hotplug assumes that the target cpu is offline while it is still
running. This leads potentially to memory corruption since resources
that are still needed by the target cpu will be freed and could be
resused while still in use.

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

[S390] smp: fix sigp stop handling

2009-10-29T14:05:13+00:00

According to the architecture a cpu must not necessarily enter stopped
state after completion of a sigp instruction with "stop" order code.
So remove the BUG() statement after self sending sigp stop to avoid
that it ever gets reached.
Also add a sigp busy check to make sure that the order gets delivered.

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

[S390] smp: fix prefix handling of offlined cpus

2009-10-29T14:05:12+00:00

Offlined cpus still have valid prefix register contents. Dumpers
will store the register contents of a cpu to the location where its
prefix register points to.
For offlined cpus the area (lowcore) has been freed and the dumper
would write the uninteresting contents of the offline cpu to a memory
location which might be in use by some other component and destroy
valueable information.
To fix this set the prefix register of offline cpus to absolute
address zero again. This prevents the current dumpers to write to
random memory locations.

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

[S390] Add highgprs facility to /proc/cpuinfo

2009-10-14T10:43:53+00:00

This patch makes the hwcap bit for the high gprs feature to be visible
in /proc/cpuinfo.

Signed-off-by: Andreas Krebbel 
Signed-off-by: Martin Schwidefsky

[S390] 64-bit register support for 31-bit processes

2009-10-06T08:35:10+00:00

From: Heiko Carstens 
From: Martin Schwidefsky 

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

[S390] hibernate: Use correct place for CPU address in lowcore

2009-10-06T08:35:10+00:00

We used address 0x1084 instead of 0x84 to store the suspend CPU address.
With this patch we use the correct address 0x84 as it is defined in
the POP.

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

[S390] pm: ignore time spend in suspended state

2009-10-06T08:35:09+00:00

The time a system has been suspended should not show up in any
of the cputime accounting fields. The time of inactivity is definitly
not any form of real cputime nor is it idle time.

Signed-off-by: Martin Schwidefsky

[S390] perf_counter: fix vdso detection

2009-10-06T08:35:09+00:00

s390 version of f2053f1a "powerpc/perf_counter: Fix vdso detection".

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