kernel/tools/testing/selftests/powerpc, branch linux-5.11.y

selftests/powerpc: Fix L1D flushing tests for Power10

2021-05-19T08:29:29Z

[ Upstream commit 3a72c94ebfb1f171eba0715998010678a09ec796 ] The rfi_flush and entry_flush selftests work by using the PM_LD_MISS_L1 perf event to count L1D misses. The value of this event has changed over time: - Power7 uses 0x400f0 - Power8 and Power9 use both 0x400f0 and 0x3e054 - Power10 uses only 0x3e054 Rather than relying on raw values, configure perf to count L1D read misses in the most explicit way available. This fixes the selftests to work on systems without 0x400f0 as PM_LD_MISS_L1, and should change no behaviour for systems that the tests already worked on. The only potential downside is that referring to a specific perf event requires PMU support implemented in the kernel for that platform. Signed-off-by: Russell Currey Acked-by: Daniel Axtens Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210223070227.2916871-1-ruscur@russell.cc Signed-off-by: Sasha Levin

selftests/powerpc: Make the test check in eeh-basic.sh posix compliant

2021-03-04T11:14:31Z

[ Upstream commit 3db380570af7052620ace20c29e244938610ca71 ] The == operand is a bash extension, thus this will fail on Ubuntu with: ./eeh-basic.sh: 89: test: 2: unexpected operator As the /bin/sh on Ubuntu is pointed to DASH. Use -eq to fix this posix compatibility issue. Fixes: 996f9e0f93f162 ("selftests/powerpc: Fix eeh-basic.sh exit codes") Signed-off-by: Po-Hsu Lin Reviewed-by: Frederic Barrat Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201228043459.14281-1-po-hsu.lin@canonical.com Signed-off-by: Sasha Levin

selftests/powerpc: Only test lwm/stmw on big endian

2021-01-20T00:49:55Z

Newer binutils (>= 2.36) refuse to assemble lmw/stmw when building in little endian mode. That breaks compilation of our alignment handler test: /tmp/cco4l14N.s: Assembler messages: /tmp/cco4l14N.s:1440: Error: `lmw' invalid when little-endian /tmp/cco4l14N.s:1814: Error: `stmw' invalid when little-endian make[2]: *** [../../lib.mk:139: /output/kselftest/powerpc/alignment/alignment_handler] Error 1 These tests do pass on little endian machines, as the kernel will still emulate those instructions even when running little endian (which is arguably a kernel bug). But we don't really need to test that case, so ifdef those instructions out to get the alignment test building again. Reported-by: Libor Pechacek Signed-off-by: Michael Ellerman Tested-by: Libor Pechacek Link: https://lore.kernel.org/r/20210119041800.3093047-1-mpe@ellerman.id.au

selftests/powerpc: Fix exit status of pkey tests

2021-01-18T21:04:32Z

Since main() does not return a value explicitly, the return values from FAIL_IF() conditions are ignored and the tests can still pass irrespective of failures. This makes sure that we always explicitly return the correct test exit status. Fixes: 1addb6444791 ("selftests/powerpc: Add test for execute-disabled pkeys") Fixes: c27f2fd1705a ("selftests/powerpc: Add test for pkey siginfo verification") Reported-by: Eirik Fuller Signed-off-by: Sandipan Das Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210118093145.10134-1-sandipan@linux.ibm.com

selftests/powerpc: Fix uninitialized variable warning

2020-12-03T14:01:21Z

Patch fixes uninitialized variable warning in bad_accesses test which causes the selftests build to fail in older distibutions bad_accesses.c: In function ‘bad_access’: bad_accesses.c:52:9: error: ‘x’ may be used uninitialized in this function [-Werror=maybe-uninitialized] printf("Bad - no SEGV! (%c)\n", x); ^ cc1: all warnings being treated as errors Signed-off-by: Harish Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201201092403.238182-1-harish@linux.ibm.com

selftests/powerpc: update .gitignore

2020-12-03T14:01:21Z

I did an in-place build of the self-tests and found that it left the tree dirty. Add missed test binaries to .gitignore Signed-off-by: Daniel Axtens Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201201144427.1228745-1-dja@axtens.net

Merge branch 'fixes' into next

2020-11-25T12:17:31Z

Merge our fixes branch, in particular to bring in the changes for the entry/uaccess flush.

selftests/powerpc: refactor entry and rfi_flush tests

2020-11-19T12:47:23Z

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

selftests/powerpc: entry flush test

2020-11-19T12:47:20Z

Add a test modelled on the RFI flush test which counts the number of L1D misses doing a simple syscall with the entry flush on and off. For simplicity of backporting, this test duplicates a lot of code from rfi_flush. We clean that up in the next patch. Signed-off-by: Daniel Axtens Signed-off-by: Michael Ellerman

selftests/powerpc: rfi_flush: disable entry flush if present

2020-11-19T12:47:12Z

We are about to add an entry flush. The rfi (exit) flush test measures the number of L1D flushes over a syscall with the RFI flush enabled and disabled. But if the entry flush is also enabled, the effect of enabling and disabling the RFI flush is masked. If there is a debugfs entry for the entry flush, disable it during the RFI flush and restore it later. Reported-by: Spoorthy S Signed-off-by: Russell Currey Signed-off-by: Daniel Axtens Signed-off-by: Michael Ellerman