linux-stable.git/tools/testing/selftests/powerpc/include/utils.h, branch linux-6.4.y

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

2023-04-20T03:21:45+00:00

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

2023-04-20T03:21:45+00:00

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 automatically allocating read_file

2023-02-09T12:56:45+00:00

A couple of tests roll their own auto-allocating file read logic.

Add a generic implementation and convert them to use it.

Signed-off-by: Benjamin Gray 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20230203003947.38033-6-bgray@linux.ibm.com

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

2023-02-09T12:56:45+00:00

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

2023-02-09T12:56:45+00:00

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 read/write debugfs file, int

2023-02-09T12:56:45+00:00

Debugfs files are not always integers, so make *_file return/write a
byte buffer, and *_int deal with int values specifically. This increases
consistency with the other file read/write helpers.

Signed-off-by: Benjamin Gray 
Reviewed-by: Andrew Donnellan 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20230203003947.38033-3-bgray@linux.ibm.com

selftests/powerpc: Add generic read/write file util

2023-02-09T12:56:45+00:00

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

selftests/powerpc: Add support to fetch "platform" and "base platform" from auxv to detect platform.

2022-06-28T13:56:46+00:00

The /proc/self/auxv contains information about "platform" on any system.
Also "base platform" which is an indication about platform string
corresponding to the real PVR. When systems are booted in compat mode,
say, power10 booted in power9 mode, "platform" will point to power9
whereas base platform will point to power10. Incase, if the distro
doesn't support platform indicated by real PVR, base platform will have
a default value.

The mismatch of platform/base platform is an indication of system booted
in compat mode. In such cases, distro will have a Generic Compat
registered which supports basic features for performance monitoring.

Some of the selftest needs to be handled differently ( ex: generic
events, alternative events, bhrb filter map) in Generic Compat PMU.
Hence selftest framework needs utility functions to identify such cases.
One way is make sure of auxv information. Below condition can be used to
detect if Generic Compat PMU is registered. ie:

  if ((AT_PLATFORM != AT_BASE_PLATFORM) && (AT_BASE_PLATFORM != PVR))

this indicates Generic Compat PMU.

Add utility function in "include/utils.h" to return:
AT_PLATFORM and AT_BASE_PLATFORM from auxv. Also update misc.c in
"sampling_tests" folder to add function to use above check to determine
presence of generic compat pmu.

In other architecture ( like x86 ), pmu_name is exposed via
"/sys/bus/event_source/devices/cpu/caps". The same could be used in
powerpc in future. Since currently we don't have the "caps" support in
powerpc, patch uses auxv information to detect platform type and compat
mode. But as placeholder utility function is added considering
possiblity of getting "caps" information via sysfs. If that doesn't
exist, fallback to using auxv information.

Signed-off-by: Athira Rajeev 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-3-atrajeev@linux.vnet.ibm.com

selftests/powerpc: Add matrix multiply assist (MMA) test

2022-04-27T06:32:42+00:00

Adds a simple test of some basic matrix multiply assist (MMA)
instructions.

Signed-off-by: Alistair Popple 
Tested-by: Joel Stanley 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200622021832.15870-1-alistair@popple.id.au

selftests/powerpc: refactor entry and rfi_flush tests

2020-11-19T12:47:23+00:00

For simplicity in backporting, the original entry_flush test contained
a lot of duplicated code from the rfi_flush test. De-duplicate that code.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman