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| author | Athira Rajeev <atrajeev@linux.vnet.ibm.com> | 2025-01-13 13:28:58 +0530 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2025-02-11 11:33:52 +0530 |
| commit | c96b1402cc8fe818b0aaaee280221a5e7b6b2242 (patch) | |
| tree | ca37fdf5b2c237dec7c3f2d6199be37358209595 /tools/testing/selftests/powerpc | |
| parent | 9785def2593c7c62fa3271d740eef0e1d1874ef4 (diff) | |
| download | lwn-c96b1402cc8fe818b0aaaee280221a5e7b6b2242.tar.gz lwn-c96b1402cc8fe818b0aaaee280221a5e7b6b2242.zip | |
selftests/powerpc/pmu: Update comment with details to understand auxv_generic_compat_pmu() utility function
auxv_generic_compat_pmu() utility function is to detect whether the
system is having generic compat PMU. The check is based on base platform
value from /proc/self/auxv. Update the comment with details on how auxv
is used to detect the platform.
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250113075858.45137-5-atrajeev@linux.vnet.ibm.com
Diffstat (limited to 'tools/testing/selftests/powerpc')
| -rw-r--r-- | tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c index 1ba675802ee9..8a538b6182a1 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c @@ -497,6 +497,13 @@ int get_thresh_cmp_val(struct event event) * Utility function to check for generic compat PMU * by comparing base_platform value from auxv and real * PVR value. + * auxv_base_platform() func gives information of "base platform" + * corresponding to PVR value. Incase, if the distro doesn't + * support platform PVR (missing cputable support), base platform + * in auxv will have a default value other than the real PVR's. + * In this case, ISAv3 PMU (generic compat PMU) will be registered + * in the system. auxv_generic_compat_pmu() makes use of the base + * platform value from auxv to do this check. */ static bool auxv_generic_compat_pmu(void) { |