linux-stable.git/tools/testing/selftests/powerpc, branch linux-5.6.y

selftests/powerpc: Fix try-run when source tree is not writable

2020-04-17T14:13:41+00:00

commit 9686813f6e9d5568bc045de0be853411e44958c8 upstream.

We added a usage of try-run to pmu/ebb/Makefile to detect if the
toolchain supported the -no-pie option.

This fails if we build out-of-tree and the source tree is not
writable, as try-run tries to write its temporary files to the current
directory. That leads to the -no-pie option being silently dropped,
which leads to broken executables with some toolchains.

If we remove the redirect to /dev/null in try-run, we see the error:

  make[3]: Entering directory '/linux/tools/testing/selftests/powerpc/pmu/ebb'
  /usr/bin/ld: cannot open output file .54.tmp: Read-only file system
  collect2: error: ld returned 1 exit status
  make[3]: Nothing to be done for 'all'.

And looking with strace we see it's trying to use a file that's in the
source tree:

  lstat("/linux/tools/testing/selftests/powerpc/pmu/ebb/.54.tmp", 0x7ffffc0f83c8)

We can fix it by setting TMPOUT to point to the $(OUTPUT) directory,
and we can verify with strace it's now trying to write to the output
directory:

  lstat("/output/kselftest/powerpc/pmu/ebb/.54.tmp", 0x7fffd1bf6bf8)

And also see that the -no-pie option is now correctly detected.

Fixes: 0695f8bca93e ("selftests/powerpc: Handle Makefile for unrecognized option")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200327095319.2347641-1-mpe@ellerman.id.au
Signed-off-by: Greg Kroah-Hartman

selftests/powerpc: Add tlbie_test in .gitignore

2020-04-17T14:13:41+00:00

commit 47bf235f324c696395c30541fe4fcf99fcd24188 upstream.

The commit identified below added tlbie_test but forgot to add it in
.gitignore.

Fixes: 93cad5f78995 ("selftests/powerpc: Add test case for tlbie vs mtpidr ordering issue")
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/259f9c06ed4563c4fa4fa8ffa652347278d769e7.1582847784.git.christophe.leroy@c-s.fr
Signed-off-by: Greg Kroah-Hartman

selftests/eeh: Bump EEH wait time to 60s

2020-01-25T13:11:37+00:00

Some newer cards supported by aacraid can take up to 40s to recover
after an EEH event. This causes spurious failures in the basic EEH
self-test since the current maximim timeout is only 30s.

Fix the immediate issue by bumping the timeout to a default of 60s,
and allow the wait time to be specified via an environmental variable
(EEH_MAX_WAIT).

Reported-by: Steve Best 
Suggested-by: Douglas Miller 
Signed-off-by: Oliver O'Halloran 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200122031125.25991-1-oohall@gmail.com

selftests/powerpc: Enable range tests on 8xx in ptrace-hwbreak.c selftest

2020-01-23T10:31:14+00:00

8xx is now able to support any range length so range tests can be
enabled.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/081e3b4e3a17a8ec9fdac46b505e3a29ca15f209.1574790198.git.christophe.leroy@c-s.fr

selftests/powerpc: Add a test of bad (out-of-range) accesses

2020-01-06T05:25:27+00:00

Userspace isn't allowed to access certain address ranges, make sure we
actually test that to at least some degree.

This would have caught the recent bug where the SLB fault handler was
incorrectly called on an out-of-range access when using the Radix MMU.
It also would have caught the bug we had in get_region_id() where we
were inserting SLB entries for bad addresses.

Signed-off-by: Michael Ellerman 
Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20190520102051.12103-1-mpe@ellerman.id.au

selftests/powerpc: spectre_v2 test must be built 64-bit

2019-11-21T04:41:39+00:00

The spectre_v2 test must be built 64-bit, it includes hand-written asm
that is 64-bit only, and segfaults if built 32-bit.

Fixes: c790c3d2b0ec ("selftests/powerpc: Add a test of spectre_v2 mitigations")
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191120023924.13130-1-mpe@ellerman.id.au

selftests/powerpc: Handle Makefile for unrecognized option

2019-11-14T08:50:31+00:00

On older distributions like Sles12SP5 gcc does not recognize
-no-pie option making the powerpc selftests build to fail

Fixes the following:
gcc: error: unrecognized command line option ‘-no-pie’

Signed-off-by: Harish 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191113094219.14946-1-harish@linux.ibm.com

powerpc/watchpoint: Support for 8xx in ptrace-hwbreak.c selftest

2019-11-13T05:58:04+00:00

On the 8xx, signals are generated after executing the instruction. So
no need to manually single-step on 8xx. Also, 8xx __set_dabr()
currently ignores length and hardcodes the length to 8 bytes. So all
unaligned and 512 byte testcase will fail on 8xx. Ignore those
testcases on 8xx.

Signed-off-by: Ravi Bangoria 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191017093204.7511-8-ravi.bangoria@linux.ibm.com

powerpc/watchpoint: Add DAR outside test in perf-hwbreak.c selftest

2019-11-13T05:58:04+00:00

So far we used to ignore exception if DAR points outside of user
specified range. But now we are ignoring it only if actual load/store
range does not overlap with user specified range. Include selftests
for the same:

  # ./tools/testing/selftests/powerpc/ptrace/perf-hwbreak
  ...
  TESTED: No overlap
  TESTED: Partial overlap
  TESTED: Partial overlap
  TESTED: No overlap
  TESTED: Full overlap
  success: perf_hwbreak

Signed-off-by: Ravi Bangoria 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191017093204.7511-7-ravi.bangoria@linux.ibm.com

selftests/powerpc: Rewrite ptrace-hwbreak.c selftest

2019-11-13T05:58:03+00:00

ptrace-hwbreak.c selftest is logically broken. On powerpc, when
watchpoint is created with ptrace, signals are generated before
executing the instruction and user has to manually singlestep the
instruction with watchpoint disabled, which selftest never does and
thus it keeps on getting the signal at the same instruction. If we fix
it, selftest fails because the logical connection between
tracer(parent) and tracee(child) is also broken. Rewrite the selftest
and add new tests for unaligned access.

With patch:
  $ ./tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak
  test: ptrace-hwbreak
  tags: git_version:powerpc-5.3-4-224-g218b868240c7-dirty
  PTRACE_SET_DEBUGREG, WO, len: 1: Ok
  PTRACE_SET_DEBUGREG, WO, len: 2: Ok
  PTRACE_SET_DEBUGREG, WO, len: 4: Ok
  PTRACE_SET_DEBUGREG, WO, len: 8: Ok
  PTRACE_SET_DEBUGREG, RO, len: 1: Ok
  PTRACE_SET_DEBUGREG, RO, len: 2: Ok
  PTRACE_SET_DEBUGREG, RO, len: 4: Ok
  PTRACE_SET_DEBUGREG, RO, len: 8: Ok
  PTRACE_SET_DEBUGREG, RW, len: 1: Ok
  PTRACE_SET_DEBUGREG, RW, len: 2: Ok
  PTRACE_SET_DEBUGREG, RW, len: 4: Ok
  PTRACE_SET_DEBUGREG, RW, len: 8: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_EXACT, WO, len: 1: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_EXACT, RO, len: 1: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_EXACT, RW, len: 1: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW ALIGNED, RW, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, RW, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, MODE_RANGE, DW UNALIGNED, DAR OUTSIDE, RW, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG, DAWR_MAX_LEN, RW, len: 512: Ok
  success: ptrace-hwbreak

Signed-off-by: Ravi Bangoria 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191017093204.7511-6-ravi.bangoria@linux.ibm.com