linux-kernel - Re: [PATCH v6 03/24] arm64: cpufeature: Add cpufeature for IRQ priority masking

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Date:   Mon, 3 Dec 2018 10:33:34 +0000
From:   Julien Thierry <Julien.Thierry@....com>
To:     Mark Rutland <Mark.Rutland@....com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "daniel.thompson@...aro.org" <daniel.thompson@...aro.org>,
        Marc Zyngier <Marc.Zyngier@....com>,
        Catalin Marinas <Catalin.Marinas@....com>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        Will Deacon <Will.Deacon@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoffer Dall <Christoffer.Dall@....com>,
        James Morse <James.Morse@....com>,
        "joel@...lfernandes.org" <joel@...lfernandes.org>
Subject: Re: [PATCH v6 03/24] arm64: cpufeature: Add cpufeature for IRQ
 priority masking

On 29/11/18 17:12, Mark Rutland wrote:
> On Mon, Nov 12, 2018 at 11:56:54AM +0000, Julien Thierry wrote:
>> Add a cpufeature indicating whether a cpu supports masking interrupts
>> by priority.
>>
>> The feature will be properly enabled in a later patch.
>>
>> Signed-off-by: Julien Thierry <julien.thierry@....com>
>> Cc: Catalin Marinas <catalin.marinas@....com>
>> Cc: Will Deacon <will.deacon@....com>
>> Cc: Marc Zyngier <marc.zyngier@....com>
>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>>  arch/arm64/include/asm/cpucaps.h    |  3 ++-
>>  arch/arm64/include/asm/cpufeature.h |  6 ++++++
>>  arch/arm64/kernel/cpufeature.c      | 23 +++++++++++++++++++++++
>>  3 files changed, 31 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
>> index 6e2d254..f367e5c 100644
>> --- a/arch/arm64/include/asm/cpucaps.h
>> +++ b/arch/arm64/include/asm/cpucaps.h
>> @@ -54,7 +54,8 @@
>>  #define ARM64_HAS_CRC3233
>>  #define ARM64_SSBS34
>>  #define ARM64_WORKAROUND_118887335
>> +#define ARM64_HAS_IRQ_PRIO_MASKING36
>>
>> -#define ARM64_NCAPS36
>> +#define ARM64_NCAPS37
>>
>>  #endif /* __ASM_CPUCAPS_H */
>> diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
>> index 7e2ec64..a6e063f 100644
>> --- a/arch/arm64/include/asm/cpufeature.h
>> +++ b/arch/arm64/include/asm/cpufeature.h
>> @@ -514,6 +514,12 @@ static inline bool system_supports_cnp(void)
>>  cpus_have_const_cap(ARM64_HAS_CNP);
>>  }
>>
>> +static inline bool system_supports_irq_prio_masking(void)
>> +{
>> +return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) &&
>> +       cpus_have_const_cap(ARM64_HAS_IRQ_PRIO_MASKING);
>> +}
>
> This should probably be s/supports/uses/.
>

Fixed locally.

> With that:
>
> Reviewed-by: Mark Rutland <mark.rutland@....com>
>

Thanks,

Julien

> Mark.
>
>> +
>>  #define ARM64_SSBD_UNKNOWN-1
>>  #define ARM64_SSBD_FORCE_DISABLE0
>>  #define ARM64_SSBD_KERNEL1
>> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
>> index 03a9d96..1b5b553 100644
>> --- a/arch/arm64/kernel/cpufeature.c
>> +++ b/arch/arm64/kernel/cpufeature.c
>> @@ -1145,6 +1145,14 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
>>  }
>>  #endif /* CONFIG_ARM64_RAS_EXTN */
>>
>> +#ifdef CONFIG_ARM64_PSEUDO_NMI
>> +static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry,
>> +   int scope)
>> +{
>> +return false;
>> +}
>> +#endif
>> +
>>  static const struct arm64_cpu_capabilities arm64_features[] = {
>>  {
>>  .desc = "GIC system register CPU interface",
>> @@ -1368,6 +1376,21 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
>>  .cpu_enable = cpu_enable_cnp,
>>  },
>>  #endif
>> +#ifdef CONFIG_ARM64_PSEUDO_NMI
>> +{
>> +/*
>> + * Depends on having GICv3
>> + */
>> +.desc = "IRQ priority masking",
>> +.capability = ARM64_HAS_IRQ_PRIO_MASKING,
>> +.type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
>> +.matches = can_use_gic_priorities,
>> +.sys_reg = SYS_ID_AA64PFR0_EL1,
>> +.field_pos = ID_AA64PFR0_GIC_SHIFT,
>> +.sign = FTR_UNSIGNED,
>> +.min_field_value = 1,
>> +},
>> +#endif
>>  {},
>>  };
>>
>> --
>> 1.9.1
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

--
Julien Thierry
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