linux-kernel - Re: [PATCH v2] arm64: cpufeature: Enable Qualcomm Falkor/Kryo errata 1003

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Date:   Tue, 29 Oct 2019 17:39:15 +0000
From:   Will Deacon <will@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, stable@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2] arm64: cpufeature: Enable Qualcomm Falkor/Kryo errata
 1003

On Tue, Oct 29, 2019 at 10:15:39AM -0700, Bjorn Andersson wrote:
> With the introduction of 'cce360b54ce6 ("arm64: capabilities: Filter the
> entries based on a given mask")' the Qualcomm Falkor/Kryo errata 1003 is
> no long applied.
> 
> The result of not applying errata 1003 is that MSM8996 runs into various
> RCU stalls and fails to boot most of the times.
> 
> Give 1003 a "type" to ensure they are not filtered out in
> update_cpu_capabilities().
> 
> Fixes: cce360b54ce6 ("arm64: capabilities: Filter the entries based on a given mask")
> Cc: stable@...r.kernel.org
> Reported-by: Mark Brown <broonie@...nel.org>
> Suggested-by: Will Deacon <will@...nel.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v1:
> - s/ARM64_CPUCAP_SCOPE_LOCAL_CPU/ARM64_CPUCAP_LOCAL_CPU_ERRATUM/
> - Dropped 1009 "fix" as it already had a type from ERRATA_MIDR_RANGE_LIST()
> 
>  arch/arm64/kernel/cpu_errata.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
> index df9465120e2f..3facd5ca52ed 100644
> --- a/arch/arm64/kernel/cpu_errata.c
> +++ b/arch/arm64/kernel/cpu_errata.c
> @@ -780,6 +780,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
>  	{
>  		.desc = "Qualcomm Technologies Falkor/Kryo erratum 1003",
>  		.capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
> +		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
>  		.matches = cpucap_multi_entry_cap_matches,
>  		.match_list = qcom_erratum_1003_list,
>  	},
> -- 
> 2.23.0

Thanks, I'll pick this up as a fix.

Will