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selftests/powerpc/pmu: Update comment with details to understand auxv_generic_compat_pmu() utility function

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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
This commit is contained in:
Athira Rajeev 2025-01-13 13:28:58 +05:30 committed by Madhavan Srinivasan
parent 9785def259
commit c96b1402cc
1 changed files with 7 additions and 0 deletions
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7
tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
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@ -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)
{