kernel.git/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h, branch master

selftests/powerpc/pmu: Add interface test for extended reg support

2025-02-11T06:03:51Z

The testcase uses check_extended_regs_support and perf_get_platform_reg_mask function to check if the platform has extended reg support. This will help to check if sampling pmu selftest is enabled or not for a given platform. Signed-off-by: Kajol Jain Signed-off-by: Athira Rajeev Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250113075858.45137-4-atrajeev@linux.vnet.ibm.com

tools/testing/selftests/powerpc: Enable pmu selftests for power11

2025-02-11T06:03:51Z

Add check for power11 pvr in the selftest utility functions. Selftests uses pvr value to check for platform support inorder to run the tests. pvr is also used to send the extended mask value to capture sampling registers. Update some of the utility functions to use hwcap2 inorder to return platform specific bits from sampling registers. Signed-off-by: Athira Rajeev Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250113075858.45137-1-atrajeev@linux.vnet.ibm.com

selftests/powerpc: Add more utility macros

2023-06-19T07:36:27Z

Adds _MSG assertion variants to provide more context behind why a failure occurred. Also include unistd.h for _exit() and stdio.h for fprintf(), and move ARRAY_SIZE macro to utils.h. The _MSG variants and ARRAY_SIZE will be used by the following DEXCR selftests. Signed-off-by: Benjamin Gray Reviewed-by: Russell Currey Signed-off-by: Michael Ellerman Link: https://msgid.link/20230616034846.311705-10-bgray@linux.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

selftests/powerpc: Add support to fetch "platform" and "base platform" from auxv to detect platform.

2022-06-28T13:56:46Z

The /proc/self/auxv contains information about "platform" on any system. Also "base platform" which is an indication about platform string corresponding to the real PVR. When systems are booted in compat mode, say, power10 booted in power9 mode, "platform" will point to power9 whereas base platform will point to power10. Incase, if the distro doesn't support platform indicated by real PVR, base platform will have a default value. The mismatch of platform/base platform is an indication of system booted in compat mode. In such cases, distro will have a Generic Compat registered which supports basic features for performance monitoring. Some of the selftest needs to be handled differently ( ex: generic events, alternative events, bhrb filter map) in Generic Compat PMU. Hence selftest framework needs utility functions to identify such cases. One way is make sure of auxv information. Below condition can be used to detect if Generic Compat PMU is registered. ie: if ((AT_PLATFORM != AT_BASE_PLATFORM) && (AT_BASE_PLATFORM != PVR)) this indicates Generic Compat PMU. Add utility function in "include/utils.h" to return: AT_PLATFORM and AT_BASE_PLATFORM from auxv. Also update misc.c in "sampling_tests" folder to add function to use above check to determine presence of generic compat pmu. In other architecture ( like x86 ), pmu_name is exposed via "/sys/bus/event_source/devices/cpu/caps". The same could be used in powerpc in future. Since currently we don't have the "caps" support in powerpc, patch uses auxv information to detect platform type and compat mode. But as placeholder utility function is added considering possiblity of getting "caps" information via sysfs. If that doesn't exist, fallback to using auxv information. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-3-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add mask/shift bits for extracting threshold compare field

2022-06-28T13:56:37Z

In power10, threshold compare field is not part of the raw event code and provided via event attribute config1. Hence add the mask and shift bits based on event attribute config1, to extract the threshold compare value for power10 Also add a new function called get_thresh_cmp_val to compute and return the threshold compare field for a given platform, since incase of power10, threshold compare value provided is decimal. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-2-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add macro to extract mmcr3 and mmcra fields

2022-03-01T12:38:13Z

Add macro and utility functions to fetch individual fields from Monitor Mode Control Register 3(MMCR3)and Monitor Mode Control Register A(MMCRA) PMU registers Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220127072012.662451-9-kjain@linux.ibm.com

selftests/powerpc/pmu: Add macro to extract mmcr0/mmcr1 fields

2022-03-01T12:38:13Z

Add macro and utility functions to fetch individual fields from Monitor Mode Control Register 0(MMCR0) and Monitor Mode Control Register 1(MMCR1) PMU register. Signed-off-by: Athira Rajeev Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220127072012.662451-8-kjain@linux.ibm.com

selftests/powerpc/pmu: Add macros to extract mmcr fields

2022-03-01T12:38:13Z

Along with it, Add macros and utility functions to fetch individual fields from Monitor Mode Control Register 2(MMCR2) register. Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220127072012.662451-7-kjain@linux.ibm.com