kernel/tools/testing/selftests/powerpc/pmu/sampling_tests, branch linux-6.2.y

selftests/powerpc/pmu: Fix sample field check in the mmcra_thresh_marked_sample_test

2023-05-11T14:11:24Z

[ Upstream commit 8a32341cf04ba05974931b4664683c2c9fb84e56 ] The testcase verifies the setting of different fields in Monitor Mode Control Register A (MMCRA). In the current code, EV_CODE_EXTRACT macro is used to extract the "sample" field, which then needs to be further processed to fetch rand_samp_elig and rand_samp_mode bits. But the current code is not passing valid sample field to EV_CODE_EXTRACT macro. Patch addresses this by fixing the input for EV_CODE_EXTRACT. Fixes: 29cf373c5766 ("selftests/powerpc/pmu: Add interface test for mmcra register fields") Reported-by: David Binderman Link: https://lore.kernel.org/r/DB6P189MB0568CF002762C6C43AF6DF169CA89@DB6P189MB0568.EURP189.PROD.OUTLOOK.COM Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://msgid.link/20230301170918.69176-1-kjain@linux.ibm.com Signed-off-by: Sasha Levin

selftests/powerpc: Update bhrb filter sampling test for multiple branch filters

2022-09-28T09:22:13Z

For PERF_SAMPLE_BRANCH_STACK sample type, different branch_sample_type, ie branch filters are supported. The testcase "bhrb_filter_map_test" tests the valid and invalid filter maps in different powerpc platforms. Update this testcase to include scenario to cover multiple branch filters at sametime. Since powerpc doesn't support multiple filters at sametime, expect failure during perf_event_open. Reported-by: Disha Goel Signed-off-by: Athira Rajeev Reviewed-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220921145255.20972-3-atrajeev@linux.vnet.ibm.com

selftests/powerpc: Add missing PMU selftests to .gitignores

2022-08-15T10:59:17Z

Some recently added selftests don't have their binaries in .gitignores, so add them. I also alphabetically sorted sampling_tests/.gitignore while I was in there. Signed-off-by: Russell Currey Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220812071632.56095-1-ruscur@russell.cc

selftests/powerpc/pmu: Add interface test for bhrb disable field for non-branch samples

2022-06-28T22:57:42Z

The testcase uses "instructions" event to generate the samples and fetch Monitor Mode Control Register A (MMCRA) when overflow. Branch History Rolling Buffer(bhrb) disable bit is part of MMCRA which need to be verified by perf interface. Incase sample is not of branch type, bhrb disable bit is explicitly set to 1. Testcase checks if the bhrb disable bit is set of MMCRA register via perf interface for ISA v3.1 platform Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-15-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest for mmcr1 pmcxsel/unit/cache fields

2022-06-28T22:57:42Z

The testcase uses event code "0x21c040" to verify the settings for different fields in Monitor Mode Control Register 1 (MMCR1). The fields include PMCxSEL, PMCXCOMB PMCxUNIT, cache. Checks if these fields are translated correctly via perf interface to MMCR1 Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-14-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest for checking valid and invalid bhrb filter maps

2022-06-28T22:57:42Z

For PERF_SAMPLE_BRANCH_STACK sample type, different branch_sample_type, ie branch filters are supported. All the branch filters are not supported in powerpc. Example, power10 platform supports any, ind_call and cond branch filters. Whereas, it is different in power9. Testcase checks event open for invalid and valid branch sample types. The branch types for testcase are picked from "perf_branch_sample_type" in perf_event.h Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-13-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest to check PERF_SAMPLE_REGS_INTR option will not crash on any platforms

2022-06-28T22:57:42Z

With sampling, --intr-regs option is used for capturing interrupt regs. When --intr-regs option is used, PMU code uses is_sier_available() function which uses PMU flags in the code. In environment where platform specific PMU is not registered, PMU flags is not defined. A fix was added in kernel to address crash while accessing is_sier_available() function when pmu is not set. commit f75e7d73bdf7 ("powerpc/perf: Fix crash with is_sier_available when pmu is not set"). Add perf sampling test to exercise this code and make sure enabling intr_regs shouldn't crash in any platform. Testcase uses software event cycles since software event will work even in cases without PMU. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-12-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest to check branch stack enablement will not crash on any platforms

2022-06-28T22:57:42Z

While enabling branch stack for an event, BHRB (Branch History Rolling Buffer) filter is set using bhrb_filter_map() callback. This callback is not defined for cases like generic_compat_pmu or in case where there is no PMU registered. A fix was added in kernel to address a crash issue observed while enabling branch stack for environments which doesn't have this callback. commit b460b512417a ("powerpc/perf: Fix crashes with generic_compat_pmu & BHRB"). Add perf sampling test to exercise this code path and make sure enabling branch stack shouldn't crash in any platform. Testcase uses software event cycles since software event is available and can be used even in cases without PMU. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-11-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Refactor the platform check and add macros to find array size/PVR

2022-06-28T22:57:39Z

The platform check for selftest support "check_pvr_for_sampling_tests" is specific to sampling tests which includes PVR check, presence of PMU and extended regs support. Extended regs support is needed for sampling tests which tests whether PMU registers are programmed correctly. There could be other sampling tests which may not need extended regs, example, bhrb filter tests which only needs validity check via event open. Hence refactor the platform check to have a common function "platform_check_for_tests" that checks only for PVR check and presence of PMU. The existing function "check_pvr_for_sampling_tests" will invoke the common function and also will include checks for extended regs specific for sampling. The common function can also be used by tests other than sampling like event code tests. Add macro to find array size ("ARRAY_SIZE") to sampling tests "misc.h" file. This can be used in next tests to find event array size. Also update "include/reg.h" to add macros to find minor and major version from PVR which will be used in testcases. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-10-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add interface test for bhrb disable field

2022-06-28T13:57:56Z

The testcase uses "instructions" event to generate the samples and fetch Monitor Mode Control Register A (MMCRA) when overflow. Branch History Rolling Buffer(bhrb) disable bit is part of MMCRA which need to be verified by perf interface. Testcase checks if the bhrb disable bit of MMCRA register is programmed correctly via perf interface for ISA v3.1 platform Also make get_mmcra_ifm return type as u64. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-9-atrajeev@linux.vnet.ibm.com