linux-toradex.git/arch/s390/kernel/processor.c, branch v4.9.60

s390/cpuinfo: show maximum thread id

2016-07-04T07:25:20+00:00

Expose the maximum thread id with /proc/cpuinfo.
With the new line the output looks like this:

vendor_id       : IBM/S390
bogomips per cpu: 20325.00
max thread id   : 1

With this new interface it is possible to always tell the correct
number of cpu threads potentially being used by the kernel.

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

s390/cpuinfo: rename cpu field to cpu number

2016-06-28T07:32:26+00:00

The cpu field name within /proc/cpuinfo has a conflict with the
powerpc and sparc output where it contains the cpu model name.  So
rename the field name to cpu number which shouldn't generate any
conflicts.

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

s390/cpuinfo: show dynamic and static cpu mhz

2016-06-13T13:58:17+00:00

Show the dynamic and static cpu mhz of each cpu. Since these values
are per cpu this requires a fundamental extension of the format of
/proc/cpuinfo.

Historically we had only a single line per cpu and a summary at the
top of the file. This format is hardly extendible if we want to add
more per cpu information.

Therefore this patch adds per cpu blocks at the end of /proc/cpuinfo:

cpu             : 0
cpu Mhz dynamic : 5504
cpu Mhz static  : 5504

cpu             : 1
cpu Mhz dynamic : 5504
cpu Mhz static  : 5504

cpu             : 2
cpu Mhz dynamic : 5504
cpu Mhz static  : 5504

cpu             : 3
cpu Mhz dynamic : 5504
cpu Mhz static  : 5504

Right now each block contains only the dynamic and static cpu mhz,
but it can be easily extended like on every other architecture.

This extension is supposed to be compatible with the old format.

Signed-off-by: Heiko Carstens 
Acked-by: Sascha Silbe 
Signed-off-by: Martin Schwidefsky

s390/cpuinfo: print cache info and all single cpu lines on first iteration

2016-06-13T13:58:17+00:00

Change the code to print all the current output during the first
iteration. This is a preparation patch for the upcoming per cpu block
extension to /proc/cpuinfo.

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

s390: add missing include statements

2016-05-10T11:24:52+00:00

arch_mmap_rnd, cpu_have_feature, and arch_randomize_brk are all
defined as globally visible variables.
However the files they are defined in do not include the header files
with the declaration. To avoid a possible mismatch add the missing
include statements so we have proper type checking in place.

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

s390/cpuinfo: simplify locking and skip offline cpus early

2016-05-10T11:24:48+00:00

Move the get_online_cpus() and put_online_cpus() to the start and stop
operation of the seqfile ops. This way there is no need to lock cpu
hotplug again and again for each single cpu.

This way we can also skip offline cpus early if we simply use
cpumask_next() within the next operation.

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

s390: show virtualization support in /proc/cpuinfo

2015-11-30T11:47:11+00:00

This patch exposes the SIE capability (aka virtualization support) via
/proc/cpuinfo -> "features" as "sie".

As we don't want to expose this hwcap via elf, let's add a second,
"internal"/non-elf capability list. The content is simply concatenated
to the existing features when printing /proc/cpuinfo.

We also add the defines to elf.h to keep the hwcap stuff at a common
place.

Acked-by: Martin Schwidefsky 
Signed-off-by: David Hildenbrand 
Signed-off-by: Christian Borntraeger

s390/diag: add a statistic for diagnose calls

2015-10-14T12:32:06+00:00

Introduce /sys/debug/kernel/diag_stat with a statistic how many diagnose
calls have been done by each CPU in the system.

Signed-off-by: Martin Schwidefsky

s390/module: enable generic CPU feature modalias using s390 ELF hwcaps

2015-07-22T07:58:02+00:00

Add support for the generic CPU feature modalias implementation that wires
up optional CPU features to udev-based module autoprobing.

The  file provides definitions to map CPU features to
s390 ELF hardware capabilities.

Signed-off-by: Hendrik Brueckner 
Signed-off-by: Martin Schwidefsky

s390/ftrace: fix crashes when switching tracers / add notrace to cpu_relax()

2015-03-02T19:35:53+00:00

With git commit 4d92f50249eb ("s390: reintroduce diag 44 calls for
cpu_relax()") I reintroduced a non-trivial cpu_relax() variant on s390.

The difference to the previous variant however is that the new version is
an out-of-line function, which will be traced if function tracing is enabled.

Switching to different tracers includes instruction patching. Therefore this
is done within stop_machine() "context" to prevent that any function tracing
is going on while instructions are being patched.
With the new out-of-line variant of cpu_relax() this is not true anymore,
since cpu_relax() gets called in a busy loop by all waiting cpus within
stop_machine() until function patching is finished.
Therefore cpu_relax() must be marked notrace.

This fixes kernel crashes when frequently switching between "function" and
"function_graph" tracers.

Moving cpu_relax() to a header file again, doesn't work because of header
include order dependencies.

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