linux.git/arch/s390/kernel/sysinfo.c, branch v4.12

s390/sysinfo: provide remaining stsi information via debugfs

2017-03-22T07:29:17+00:00

Provide the remaining stsi information via debugfs files. This also
might be useful for debugging purposes.

Suggested-by: Christian Borntraeger 
Acked-by: Christian Borntraeger 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/sysinfo,topology: provide raw stsi 15,1,x data via debugfs

2017-03-22T07:29:15+00:00

Provide the raw stsi 15,1,x data contents via debugfs. This makes it
much easier to debug unexpected scheduling domains on machines that
provide cpu topology information.

Therefore this file adds a new 's390/stsi' debugfs directory with a
file for each possible topology nesting level that is allowed by the
architecture. The files will be created regardless if the machine
supports all, or any, level.  If a level is not supported, or no data
is available, user space can recognize this with a -EINVAL error code
when trying to read such data.
In addition a 'topology' symlink is created that points to the file
that contains the data that is used to create the scheduling domains.

Acked-by: Christian Borntraeger 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: kernel: Audit and remove any unnecessary uses of module.h

2017-02-17T06:40:31+00:00

Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  The advantage
in doing so is that module.h itself sources about 15 other headers;
adding significantly to what we feed cpp, and it can obscure what
headers we are effectively using.

Since module.h was the source for init.h (for __init) and for
export.h (for EXPORT_SYMBOL) we consider each change instance
for the presence of either and replace as needed.  Build testing
revealed some implicit header usage that was fixed up accordingly.

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

s390/sysinfo: show partition extended name and UUID if available

2016-12-07T11:29:47+00:00

Extract extended name and UUID from SYSIB 2.2.2 data.
As the code to convert the raw extended name into printable format
can be reused by stsi_2_2_2 we're moving the conversion code into a
separate function convert_ext_name.

Signed-off-by: Viktor Mihajlovski 
Reviewed-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/fpu: improve kernel_fpu_[begin|end]

2016-08-29T09:05:01+00:00

In case of nested user of the FPU or vector registers in the kernel
the current code uses the mask of the FPU/vector registers of the
previous contexts to decide which registers to save and restore.
E.g. if the previous context used KERNEL_VXR_V0V7 and the next
context wants to use KERNEL_VXR_V24V31 the first 8 vector registers
are stored to the FPU state structure. But this is not necessary
as the next context does not use these registers.

Rework the FPU/vector register save and restore code. The new code
does a few things differently:
1) A lowcore field is used instead of a per-cpu variable.
2) The kernel_fpu_end function now has two parameters just like
   kernel_fpu_begin. The register flags are required by both
   functions to save / restore the minimal register set.
3) The inline functions kernel_fpu_begin/kernel_fpu_end now do the
   update of the register masks. If the user space FPU registers
   have already been stored neither save_fpu_regs nor the
   __kernel_fpu_begin/__kernel_fpu_end functions have to be called
   for the first context. In this case kernel_fpu_begin adds 7
   instructions and kernel_fpu_end adds 4 instructions.
3) The inline assemblies in __kernel_fpu_begin / __kernel_fpu_end
   to save / restore the vector registers are simplified a bit.

Signed-off-by: Martin Schwidefsky

s390/sysinfo: use basic block for stsi inline assembly

2016-06-28T07:32:36+00:00

Use only simple inline assemblies which consist of a single basic
block if the register asm construct is being used.

Otherwise gcc would generate broken code if the compiler option
--sanitize-coverage=trace-pc would be used.

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

s390: calculate loops_per_jiffies with fp instructions

2016-06-15T14:37:10+00:00

Implement calculation of loops_per_jiffies with fp instructions which
are available on all 64 bit machines.
To save and restore floating point register context use the new vx support
functions.

Reviewed-by: Hendrik Brueckner 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/sysinfo: add missing SYSIB 1.2.2 multithreading fields

2016-01-11T11:27:00+00:00

Add missing multithreading fields of SYSIB 1.2.2 (Basic-Machine CPUs)
to the output of /proc/sysinfo.

Also use bitfields for SYSIB 2.2.2 to simplify the C code a bit.

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

s390: get rid of CONFIG_SCHED_MC and CONFIG_SCHED_BOOK

2015-12-30T09:34:57+00:00

Use CONFIG_TOPOLOGY which selects CONFIG_SCHED_* all over the place to
reduce the random usage of the previous config options.

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

s390/sysinfo: Remove unused variables

2015-12-18T13:59:30+00:00

max_mnest and rc are never used.

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