linux-kernel - Re: [PATCH 13/17] arm64: cpu_errata: Allow an erratum to be match for all revisions of a core

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Date:   Mon, 20 Mar 2017 15:30:55 +0000
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <marc.zyngier@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Scott Wood <oss@...error.net>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Ding Tianhong <dingtianhong@...wei.com>
Subject: Re: [PATCH 13/17] arm64: cpu_errata: Allow an erratum to be match for
 all revisions of a core

On 20/03/17 14:56, Mark Rutland wrote:
> On Mon, Mar 06, 2017 at 11:26:18AM +0000, Marc Zyngier wrote:
>> Some minor erratum may not be fixed in further revisions of a core,
>> leading to a situation where the workaround needs to be updated each
>> time an updated core is released.
>
> That is somewhat unfortunate. :(
>
>> Introduce a MIDR_ALL_VERSIONS match helper that will work for all
>> versions of that MIDR, once and for all.
>>
>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>
> This looks sane to me. FWIW:
>
> Acked-by: Mark Rutland <mark.rutland@....com>
>
> Suzuki, any thoughts?

Fine by me.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>


>
> Mark.
>
>> ---
>>  arch/arm64/kernel/cpu_errata.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
>> index f6cc67e7626e..2be1d1c05303 100644
>> --- a/arch/arm64/kernel/cpu_errata.c
>> +++ b/arch/arm64/kernel/cpu_errata.c
>> @@ -53,6 +53,13 @@ static int cpu_enable_trap_ctr_access(void *__unused)
>>  	.midr_range_min = min, \
>>  	.midr_range_max = max
>>
>> +#define MIDR_ALL_VERSIONS(model) \
>> +	.def_scope = SCOPE_LOCAL_CPU, \
>> +	.matches = is_affected_midr_range, \
>> +	.midr_model = model, \
>> +	.midr_range_min = 0, \
>> +	.midr_range_max = (MIDR_VARIANT_MASK | MIDR_REVISION_MASK)
>> +
>>  const struct arm64_cpu_capabilities arm64_errata[] = {
>>  #if	defined(CONFIG_ARM64_ERRATUM_826319) || \
>>  	defined(CONFIG_ARM64_ERRATUM_827319) || \
>> --
>> 2.11.0
>>