kernel.git/tools/testing/selftests/powerpc/pmu, branch linux-5.10.y

selftests/powerpc: Fix "no_handler" EBB selftest

2021-07-20T14:05:43Z

[ Upstream commit 45677c9aebe926192e59475b35a1ff35ff2d4217 ] The "no_handler_test" in ebb selftests attempts to read the PMU registers twice via helper function "dump_ebb_state". First dump is just before closing of event and the second invocation is done after closing of the event. The original intention of second dump_ebb_state was to dump the state of registers at the end of the test when the counters are frozen. But this will be achieved with the first call itself since sample period is set to low value and PMU will be frozen by then. Hence patch removes the dump which was done before closing of the event. Reported-by: Shirisha Ganta Signed-off-by: Athira Rajeev Tested-by: Nageswara R Sastry > Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1621950703-1532-2-git-send-email-atrajeev@linux.vnet.ibm.com Signed-off-by: Sasha Levin

selftests/powerpc: Skip L3 bank test on older CPUs

2020-09-08T12:24:08Z

This is a test of specific piece of logic in isa207-common.c, which is only used on Power8 or later. So skip it on older CPUs. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200819015727.1977134-7-mpe@ellerman.id.au

selftests/powerpc: Include asm/cputable.h from utils.h

2020-09-08T12:23:59Z

utils.h provides have_hwcap() and have_hwcap2() which check for a feature bit. Those bits are defined in asm/cputable.h, so include it in utils.h so users of utils.h don't have to do it manually. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200819015727.1977134-4-mpe@ellerman.id.au

selftests/powerpc: Skip vmx/vsx/tar/etc tests on older CPUs

2020-08-03T12:12:41Z

Some of our tests use VSX or newer VMX instructions, so need to be skipped on older CPUs to avoid SIGILL'ing. Similarly TAR was added in v2.07, and the PMU event used in the stcx fail test only works on Power8 or later. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200803020719.96114-1-mpe@ellerman.id.au

selftests/powerpc: Add test of stack expansion logic

2020-07-29T11:02:11Z

We have custom stack expansion checks that it turns out are extremely badly tested and contain bugs, surprise. So add some tests that exercise the code and capture the current boundary conditions. The signal test currently fails on 64-bit kernels because the 2048 byte allowance for the signal frame is too small, we will fix that in a subsequent patch. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200724092528.1578671-1-mpe@ellerman.id.au

selftests/powerpc: Run per_event_excludes test on Power8 or later

2020-07-21T14:01:23Z

The per_event_excludes test wants to run on Power8 or later. But currently it checks that AT_BASE_PLATFORM *equals* power8, which means it only runs on Power8. Fix it to check for the ISA 2.07 feature, which will be set on Power8 and later CPUs. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200716122142.3776261-1-mpe@ellerman.id.au

Merge branch 'fixes' into next

2020-07-18T12:43:55Z

Merge our fixes branch, primarily to bring in the ebb selftests build fix and the pkey fix, which is a dependency for some future work.

selftests/powerpc: Purge extra count_pmc() calls of ebb selftests

2020-07-08T12:09:31Z

An extra count on ebb_state.stats.pmc_count[PMC_INDEX(pmc)] is being per- formed when count_pmc() is used to reset PMCs on a few selftests. This extra pmc_count can occasionally invalidate results, such as the ones from cycles_test shown hereafter. The ebb_check_count() failed with an above the upper limit error due to the extra value on ebb_state.stats.pmc_count. Furthermore, this extra count is also indicated by extra PMC1 trace_log on the output of the cycle test (as well as on pmc56_overflow_test): ========== ... [21]: counter = 8 [22]: register SPRN_MMCR0 = 0x0000000080000080 [23]: register SPRN_PMC1 = 0x0000000080000004 [24]: counter = 9 [25]: register SPRN_MMCR0 = 0x0000000080000080 [26]: register SPRN_PMC1 = 0x0000000080000004 [27]: counter = 10 [28]: register SPRN_MMCR0 = 0x0000000080000080 [29]: register SPRN_PMC1 = 0x0000000080000004 >> [30]: register SPRN_PMC1 = 0x000000004000051e PMC1 count (0x280000546) above upper limit 0x2800003e8 (+0x15e) [FAIL] Test FAILED on line 52 failure: cycles ========== Signed-off-by: Desnes A. Nunes do Rosario Tested-by: Sachin Sant Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200626164737.21943-1-desnesn@linux.ibm.com

selftests/powerpc: Fix build failure in ebb tests

2020-06-26T02:53:09Z

We use OUTPUT directory as TMPOUT for checking no-pie option. Since commit f2f02ebd8f38 ("kbuild: improve cc-option to clean up all temporary files") when building powerpc/ from selftests directory, the OUTPUT directory points to powerpc/pmu/ebb/ and gets removed when checking for -no-pie option in try-run routine, subsequently build fails with the following: $ make -C powerpc ... TARGET=ebb; BUILD_TARGET=$OUTPUT/$TARGET; mkdir -p $BUILD_TARGET; make OUTPUT=$BUILD_TARGET -k -C $TARGET all make[2]: Entering directory '/home/linux-master/tools/testing/selftests/powerpc/pmu/ebb' make[2]: *** No rule to make target 'Makefile'. make[2]: Failed to remake makefile 'Makefile'. make[2]: *** No rule to make target 'ebb.c', needed by '/home/linux-master/tools/testing/selftests/powerpc/pmu/ebb/reg_access_test'. make[2]: *** No rule to make target 'ebb_handler.S', needed by '/home/linux-master/tools/testing/selftests/powerpc/pmu/ebb/reg_access_test'. make[2]: *** No rule to make target 'trace.c', needed by '/home/linux-master/tools/testing/selftests/powerpc/pmu/ebb/reg_access_test'. make[2]: *** No rule to make target 'busy_loop.S', needed by '/home/linux-master/tools/testing/selftests/powerpc/pmu/ebb/reg_access_test'. make[2]: Target 'all' not remade because of errors. Fix this by adding a suffix to the OUTPUT directory so that the failure is avoided. Fixes: 9686813f6e9d ("selftests/powerpc: Fix try-run when source tree is not writable") Signed-off-by: Harish [mpe: Mention that commit that triggered the breakage] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200625165721.264904-1-harish@linux.ibm.com

selftests/powerpc: Add a test of counting larx/stcx

2020-05-15T01:58:55Z

This is based on the count_instructions test. However this one also counts the number of failed stcx's, and in conjunction with knowing the size of the stcx loop, can calculate the total number of instructions executed even in the face of non-deterministic stcx failures. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200426114410.3917383-1-mpe@ellerman.id.au