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

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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 <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-9-atrajeev@linux.vnet.ibm.com
This commit is contained in:
Kajol Jain
2022-06-10 19:10:46 +05:30
committed by Michael Ellerman
parent 014fb4a3ae
commit 84cc4e66d9
3 changed files with 69 additions and 2 deletions
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2
tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h
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@@ -188,7 +188,7 @@ static inline int get_mmcra_sm(u64 mmcra, int pmc)
return ((mmcra >> 42) & 0x3);
}
static inline int get_mmcra_bhrb_disable(u64 mmcra, int pmc)
static inline u64 get_mmcra_bhrb_disable(u64 mmcra, int pmc)
{
if (pvr == POWER10)
return mmcra & BHRB_DISABLE;