selftests/powerpc: Don't touch VMX/VSX on older CPUs

If we're running on a CPU without VMX/VSX then don't touch them. This
is fragile, the compiler could spill a VMX/VSX register and break the
test

selftests/powerpc: Don't touch VMX/VSX on older CPUs

If we're running on a CPU without VMX/VSX then don't touch them. This
is fragile, the compiler could spill a VMX/VSX register and break the
test anyway. But in practice it seems to work, ie. the test runs to
completion on a system without VSX with this change.

Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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selftests/powerpc: Fix CPU affinity for child process

On systems with large number of cpus, test fails trying to set
affinity by calling sched_setaffinity() with smaller size for affinity
mask. This

selftests/powerpc: Fix CPU affinity for child process

On systems with large number of cpus, test fails trying to set
affinity by calling sched_setaffinity() with smaller size for affinity
mask. This patch fixes it by making sure that the size of allocated
affinity mask is dependent on the number of CPUs as reported by
get_nprocs().

Fixes: 00b7ec5c9cf3 ("selftests/powerpc: Import Anton's context_switch2 benchmark")
Reported-by: Shirisha Ganta <[email protected]>
Signed-off-by: Sandipan Das <[email protected]>
Signed-off-by: Harish <[email protected]>
Reviewed-by: Kamalesh Babulal <[email protected]>
Reviewed-by: Satheesh Rajendran <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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selftests/powerpc: context_switch: Fix pthread errors

Turns out pthreads returns an errno and doesn't set errno. This doesn't
play well with perror().

Signed-off-by: Cyril Bur <[email protected]>

selftests/powerpc: context_switch: Fix pthread errors

Turns out pthreads returns an errno and doesn't set errno. This doesn't
play well with perror().

Signed-off-by: Cyril Bur <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>

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selftests/powerpc: context_switch use private futexes with threads

This reduces overhead of mutex locking and increases context switch
rate significantly (which helps to measure and profile the cont

selftests/powerpc: context_switch use private futexes with threads

This reduces overhead of mutex locking and increases context switch
rate significantly (which helps to measure and profile the context
switch path).

Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>

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selftests/powerpc: Move shared headers into new include dir

There are some functions, especially register related, which can
be shared across multiple selftests/powerpc test directories.

This patch

selftests/powerpc: Move shared headers into new include dir

There are some functions, especially register related, which can
be shared across multiple selftests/powerpc test directories.

This patch creates a new include directory to store those shared
files, so that the file layout becomes more neat.

Signed-off-by: Simon Guo <[email protected]>
[mpe: Reworked to move the headers only]
Signed-off-by: Michael Ellerman <[email protected]>

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selftests/powerpc: Fix generation of vector instructions/types in context_switch

Currently it doesn't appear the resulting binary actually uses any
Altivec or VSX instructions the solution is to exp

selftests/powerpc: Fix generation of vector instructions/types in context_switch

Currently it doesn't appear the resulting binary actually uses any
Altivec or VSX instructions the solution is to explicitly tell GCC to
use vector instructions and use vector types in the code.

Part of this this issue can be GCC version specific:

GCC 4.9.x is happy to use Altivec and VSX instructions if altivec.h is
includedi (and possibly if vector types are used), this also means that
4.9.x will use VSX instructions even if only -maltivec is passed. It is
also possible that Altivec instructions will be used even without
-maltivec or -mabi=altivec.

GCC 5.2.x complains about the lack of -maltivec parameter if altivec.h
is included and will not use VSX unless -mvsx is present on commandline.

GCC 5.3.0 has a regression that means __attribute__((__target__("no-vsx"))
fails to build. A fix is targeted for 5.4.

Furthermore LTO (Link Time Optimisation) doesn't play well with
__attribute__((__target__("no-vsx")), LTO can cause GCC to forget about
the attribute and compile with VSX instructions regardless. Be wary when
enabling -flfo for this test.

Signed-off-by: Cyril Bur <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>

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selftests/powerpc: Fix usage message in context_switch

When we inverted the behaviour of the flags we forgot to update the
usage message.

Fixes: 51c21e72eb99 ("selftests/powerpc: Make context_switc

selftests/powerpc: Fix usage message in context_switch

When we inverted the behaviour of the flags we forgot to update the
usage message.

Fixes: 51c21e72eb99 ("selftests/powerpc: Make context_switch touch FP/altivec/vector by default")
Signed-off-by: Cyril Bur <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>

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selftests/powerpc: Make context_switch touch FP/altivec/vector by default

Simply because it touches more code paths that way, and therefore tests
more things.

Signed-off-by: Michael Ellerman <mpe@e

selftests/powerpc: Make context_switch touch FP/altivec/vector by default

Simply because it touches more code paths that way, and therefore tests
more things.

Signed-off-by: Michael Ellerman <[email protected]>
Acked-by: Anton Blanchard <[email protected]>

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selftests/powerpc: Make context_switch do something with no args

For ease of use make the context_switch test do something useful when
called with no arguments.

Default to a 30 second run, using th

selftests/powerpc: Make context_switch do something with no args

For ease of use make the context_switch test do something useful when
called with no arguments.

Default to a 30 second run, using threads, doing yield, and use any
online cpu. Make it print out what it's doing to avoid confusion.

Signed-off-by: Michael Ellerman <[email protected]>
Acked-by: Anton Blanchard <[email protected]>

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selftests/powerpc: Import Anton's context_switch2 benchmark

This gets referred to a lot in commit messages, so let's pull it into
the selftests.

Almost vanilla from: http://ozlabs.org/~anton/junkco

selftests/powerpc: Import Anton's context_switch2 benchmark

This gets referred to a lot in commit messages, so let's pull it into
the selftests.

Almost vanilla from: http://ozlabs.org/~anton/junkcode/context_switch2.c

Signed-off-by: Anton Blanchard <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Acked-by: Anton Blanchard <[email protected]>

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