kernel/tools/testing/selftests/powerpc/pmu/lib.c, branch linux-rolling-stable

selftests/powerpc: Allow bind_to_cpu() to automatically pick CPU

2023-04-20T03:21:45Z

All current users of bind_to_cpu() don't care _which_ CPU they get, just that they are bound to a single free one. So alter the interface to 1. Accept a BIND_CPU_ANY value that tells it to automatically pick a CPU 2. Return the picked CPU And convert all these users to bind_to_cpu(BIND_CPU_ANY). Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20230406043320.125138-4-bgray@linux.ibm.com

selftests/powerpc: Move bind_to_cpu() to utils.h

2023-04-20T03:21:45Z

This function will be useful in the DSCR test patches later in this series, so promote it to be shared by all powerpc selftests. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20230406043320.125138-3-bgray@linux.ibm.com

selftests/powerpc: Add {read,write}_{long,ulong}

2023-02-09T12:56:45Z

Add helper functions to read and write (unsigned) long values directly from/to files. One of the kernel interfaces uses hex strings, so we need to allow passing a base too. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20230203003947.38033-5-bgray@linux.ibm.com

selftests/powerpc: Parse long/unsigned long value safely

2023-02-09T12:56:45Z

Often a file is expected to hold an integral value. Existing functions will use a C stdlib function like atoi or strtol to parse the file. These operations are error prone, with complicated error conditions (atoi returns 0 if not a number, and is undefined behaviour if not in range. strtol returns 0 if not a number, and LONG_MIN/MAX if not in range + sets errno to ERANGE). Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20230203003947.38033-4-bgray@linux.ibm.com

selftests/powerpc: Add generic read/write file util

2023-02-09T12:56:45Z

File read/write is reimplemented in about 5 different ways in the various PowerPC selftests. This indicates it should be a common util. Add a common read_file / write_file implementation and convert users to it where (easily) possible. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20230203003947.38033-2-bgray@linux.ibm.com

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30T18:29:21Z

Based on 1 normalized pattern(s): licensed under gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 99 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Richard Fontana Reviewed-by: Allison Randal Reviewed-by: Steve Winslow Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.163048684@linutronix.de Signed-off-by: Greg Kroah-Hartman

selftests/powerpc: Return false instead of -1 in require_paranoia_below()

2016-11-14T09:06:00Z

Returning a negative value for a boolean function seem to have the undesired effect of returning true. require_paranoia_below() is a boolean function, but the variable used to store the return value is an integer, receiving -1 or 0. This patch converts rc to bool, replaces -1 by false, and 0 by true. mpe: This wasn't exhibiting in practice because the common case, where we do the comparison of the desired level vs the current value, was being compiled into a computation based on the result of the comparison, ie. it wasn't using the default -1 value at all. However that was just luck and the code is still wrong. Signed-off-by: Peter Senna Tschudin Signed-off-by: Andrew Shadura Signed-off-by: Michael Ellerman

selftests/powerpc/pmu: Use signed long to read perf_event_paranoid

2016-07-05T13:49:49Z

Excerpt from man 2 perf_event_open: /proc/sys/kernel/perf_event_paranoid The perf_event_paranoid file can be set to restrict access to the performance counters. 2 allow only user-space measurements. 1 allow both kernel and user measurements (default). 0 allow access to CPU-specific data but not raw tracepoint samples. -1 no restrictions. require_paranoia_below() should return 0 if perf_event_paranoid is below a specified level, the value from perf_event_paranoid is read into an unsigned long so the incorrect value is returned when perf_event_paranoid is set to -1. Without this patch applied there is the same number of selftests/powerpc which skip when /proc/sys/kernel/perf_event_paranoid is set to 1 or -1 but no skips when set to zero. With this patch applied there are no skipped selftests/powerpc test when /proc/sys/kernel/perf_event_paranoid is set to 0 or -1. Signed-off-by: Cyril Bur Signed-off-by: Michael Ellerman

selftests/powerpc: Move pick_online_cpu() up into utils.c

2015-12-16T23:46:41Z

We want to use this in another test, so make it available at the top of the powerpc selftests tree. Signed-off-by: Michael Ellerman

selftests/powerpc: Move get_auxv_entry() to harness.c

2015-04-11T10:49:20Z

Move get_auxv_entry() from pmu/lib.c up to harness.c in order to make it available to other tests. Signed-off-by: Sam Bobroff Signed-off-by: Michael Ellerman