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arm64/perf: Replace PMU version number '0' with ID_AA64DFR0_EL1_PMUVer_NI 

__armv8pmu_probe_pmu() returns if detected PMU is either not implemented or
implementation defined. Extracted ID_AA64DFR0_EL1_PMUVer value, when PMU is
not implemented is '0' which can be replaced with ID_AA64DFR0_EL1_PMUVer_NI
defined as '0b0000'.

Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20221128025449.39085-1-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Anshuman Khandual 2022-11-28 08:24:49 +05:30 committed by Will Deacon
parent ce00d127a6
commit cc91b94816
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kernel/perf_event.c
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@ -1146,7 +1146,8 @@ static void __armv8pmu_probe_pmu(void *info)
dfr0 = read_sysreg(id_aa64dfr0_el1);
pmuver = cpuid_feature_extract_unsigned_field(dfr0,
ID_AA64DFR0_EL1_PMUVer_SHIFT);
if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF || pmuver == 0)
if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF ||
pmuver == ID_AA64DFR0_EL1_PMUVer_NI)
return;
cpu_pmu->pmuver = pmuver;