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

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: 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

selftests/powerpc/pmu: Add interface test for mmcra_ifm field for conditional branch type

2022-06-28T13:57:56Z

The testcase uses "instructions" event to check if the Instruction filtering mode(IFM) bits are programmed correctly for conditional branch type. Testcase checks if IFM bits is programmed correctly to Monitor Mode Control Register A (MMCRA) via perf interface for ISA v3.1 platform. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-8-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add interface test for mmcra_ifm field for any branch type

2022-06-28T13:57:55Z

The testcase uses "instructions" event to check if the Instruction filtering mode(IFM) bits are programmed correctly for type any branch. Testcase checks if IFM bits is programmed correctly to Monitor Mode Control Register A (MMCRA) via perf interface. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-7-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add interface test for mmcra_ifm field of indirect call type

2022-06-28T13:57:55Z

The testcase uses "instructions" event to check if the Instruction filtering mode(IFM) bits are programmed correctly for indirect branch type. Testcase checks if IFM bits are programmed correctly to Monitor Mode Control Register A (MMCRA) via perf interface for ISA v3.1 platform. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-6-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add interface test for mmcra_thresh_cmp fields

2022-06-28T13:57:42Z

The testcase uses event code 0x35340401e0 for load only sampling, to verify the settings of thresh compare field in Monitor Mode Control Register A (MMCRA: 9-18 bits for power9 and MMCRA: 8-18 bits for power10). Testcase checks if the thresh compare field is programmed correctly via perf interface to MMCRA register. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-4-atrajeev@linux.vnet.ibm.com