Messages in this thread Patch in this message | | | From | Anshuman Khandual <> | Subject | [PATCH] arm64/perf: Replace PMU version number '0' with ID_AA64DFR0_EL1_PMUVer_NI | Date | Mon, 28 Nov 2022 08:24:49 +0530 |
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__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> --- This applies on v6.1-rc6
arch/arm64/kernel/perf_event.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index 85a3aaefc0fb..b638f584b4dd 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -1188,7 +1188,8 @@ 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; -- 2.25.1
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