linux.git/tools/testing/selftests/powerpc, branch v5.2-rc2

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

selftests/powerpc: Add a signal fuzzer selftest

2019-05-02T16:55:02+00:00

This is a new selftest that raises SIGUSR1 signals and handles it in a
set of different ways, trying to create different scenario for testing
purpose.

This test works raising a signal and calling sigreturn interleaved
with TM operations, as starting, suspending and terminating a
transaction. The test depends on random numbers, and, based on them,
it sets different TM states.

Other than that, the test fills out the user context struct that is
passed to the sigreturn system call with random data, in order to make
sure that the signal handler syscall can handle different and invalid
states properly.

This selftest has command line parameters to control what kind of
tests the user wants to run, as for example, if a transaction should
be started prior to signal being raised, or, after the signal being
raised and before the sigreturn. If no parameter is given, the default
is enabling all options.

This test does not check if the user context is being read and set
properly by the kernel. Its purpose, at this time, is basically
guaranteeing that the kernel does not crash on invalid scenarios.

Signed-off-by: Breno Leitao 
Signed-off-by: Michael Ellerman

powerpc: prepare string/mem functions for KASAN

2019-05-02T15:20:25+00:00

CONFIG_KASAN implements wrappers for memcpy() memmove() and memset()
Those wrappers are doing the verification then call respectively
__memcpy() __memmove() and __memset(). The arches are therefore
expected to rename their optimised functions that way.

For files on which KASAN is inhibited, #defines are used to allow
them to directly call optimised versions of the functions without
going through the KASAN wrappers.

See commit 393f203f5fd5 ("x86_64: kasan: add interceptors for
memset/memmove/memcpy functions") for details.

Other string / mem functions do not (yet) have kasan wrappers,
we therefore have to fallback to the generic versions when
KASAN is active, otherwise KASAN checks will be skipped.

Signed-off-by: Christophe Leroy 
[mpe: Fixups to keep selftests working]
Signed-off-by: Michael Ellerman

powerpc/mm: Move book3s64 specifics in subdirectory mm/book3s64

2019-05-02T15:18:38+00:00

Many files in arch/powerpc/mm are only for book3S64. This patch
creates a subdirectory for them.

Signed-off-by: Christophe Leroy 
[mpe: Update the selftest sym links, shorten new filenames, cleanup some
      whitespace and formatting in the new files.]
Signed-off-by: Michael Ellerman

selftests/powerpc: Remove duplicate header

2019-02-26T01:32:06+00:00

Remove duplicate headers which are included twice.

Signed-off-by: Sabyasachi Gupta 
Signed-off-by: Souptick Joarder 
[mpe: Split out of larger patch]
Signed-off-by: Michael Ellerman

powerpc/selftest: fix type of mftb() in null_syscall

2019-02-21T13:10:15+00:00

All callers of mftb() expect 'unsigned long', and the function itself
only returns lower part of the TB so it really is 'unsigned long'
not 'unsigned long long'

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman

selftests/powerpc: New TM signal self test

2019-01-15T00:17:09+00:00

A new self test that forces MSR[TS] to be set without calling any TM
instruction. This test also tries to cause a page fault at a signal
handler, exactly between MSR[TS] set and tm_recheckpoint(), forcing
thread->texasr to be rewritten with TEXASR[FS] = 0, which will cause a BUG
when tm_recheckpoint() is called.

This test is not deterministic, since it is hard to guarantee that the page
access will cause a page fault. In order to force more page faults at
signal context, the signal handler and the ucontext are being mapped into a
MADV_DONTNEED memory chunks.

Tests have shown that the bug could be exposed with few interactions in a
buggy kernel. This test is configured to loop 5000x, having a good chance
to hit the kernel issue in just one run.  This self test takes less than
two seconds to run.

This test uses set/getcontext because the kernel will recheckpoint
zeroed structures, causing the test to segfault, which is undesired because
the test needs to rerun, so, there is a signal handler for SIGSEGV which
will restart the test.

v2: Uses the MADV_DONTNEED memory advice
v3: Fix memcpy and 32-bits compilation
v4: Does not define unused macros

Signed-off-by: Breno Leitao 
Signed-off-by: Michael Ellerman

selftests/powerpc: Add checks for transactional sigreturn

2018-12-21T03:46:50+00:00

This is a new test case that creates a signal and starts a suspended
transaction inside the signal handler.

It returns from the signal handler with the CPU at suspended state, but
without setting user context MSR Transaction State (TS) field.

The kernel signal handler code should be able to handle this discrepancy
instead of crashing.

This code could be compiled and used to test 32 and 64-bits signal
handlers.

Signed-off-by: Breno Leitao 
Signed-off-by: Gustavo Romero 
Signed-off-by: Michael Ellerman

selftests/powerpc: Skip test instead of failing

2018-11-25T06:11:22+00:00

Current core-pkey selftest fails if the test runs without privileges to
write into the core pattern file (/proc/sys/kernel/core_pattern). This
causes the test to fail and give the impression that the subsystem being
tested is broken, when, in fact, the test is being executed without the
proper privileges. This is the current error:

	test: core_pkey
	tags: git_version:v4.19-3-g9e3363be9bce-dirty
	Error writing to core_pattern file: Permission denied
	failure: core_pkey

This patch simply skips this test if it runs without the proper privileges,
avoiding this undesired failure.

CC: Tyrel Datwyler 
CC: Thiago Jung Bauermann 
Signed-off-by: Breno Leitao 
Reviewed-by: Thiago Jung Bauermann 
Signed-off-by: Michael Ellerman

selftests/powerpc: Create a new SKIP_IF macro

2018-11-25T06:11:22+00:00

This patch creates a new macro that skips a test and prints a message to
stderr. This is useful to give an idea why the tests is being skipped,
other than just skipping the test blindly.

Signed-off-by: Breno Leitao 
Reviewed-by: Thiago Jung Bauermann 
Signed-off-by: Michael Ellerman