linux-kernel - Re: [REPOST PATCH 06/16] tools: arm64: perf_event: Define Cycle counter enable/overflow bits

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Date:   Thu, 2 Mar 2023 16:46:51 -0800
From:   Reiji Watanabe <reijiw@...gle.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
Cc:     Oliver Upton <oupton@...gle.com>, Marc Zyngier <maz@...nel.org>,
        Ricardo Koller <ricarkol@...gle.com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [REPOST PATCH 06/16] tools: arm64: perf_event: Define Cycle
 counter enable/overflow bits

Hi Raghu,

On Tue, Feb 14, 2023 at 5:07 PM Raghavendra Rao Ananta
<rananta@...gle.com> wrote:
>
> Add the definitions of ARMV8_PMU_CNTOVS_C (Cycle counter overflow
> bit) for overflow status registers and ARMV8_PMU_CNTENSET_C (Cycle
> counter enable bit) for PMCNTENSET_EL0 register.
>
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> ---
>  tools/arch/arm64/include/asm/perf_event.h | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/tools/arch/arm64/include/asm/perf_event.h b/tools/arch/arm64/include/asm/perf_event.h
> index 97e49a4d4969f..8ce23aabf6fe6 100644
> --- a/tools/arch/arm64/include/asm/perf_event.h
> +++ b/tools/arch/arm64/include/asm/perf_event.h
> @@ -222,9 +222,11 @@
>  /*
>   * PMOVSR: counters overflow flag status reg
>   */
> +#define ARMV8_PMU_CNTOVS_C      (1 << 31) /* Cycle counter overflow bit */

Nit: This macro doesn't seem to be used in any of the patches.
Do we need this ?

Thank you,
Reiji


>  #define        ARMV8_PMU_OVSR_MASK             0xffffffff      /* Mask for writable bits */
>  #define        ARMV8_PMU_OVERFLOWED_MASK       ARMV8_PMU_OVSR_MASK
>
> +
>  /*
>   * PMXEVTYPER: Event selection reg
>   */
> @@ -247,6 +249,11 @@
>  #define ARMV8_PMU_USERENR_CR   (1 << 2) /* Cycle counter can be read at EL0 */
>  #define ARMV8_PMU_USERENR_ER   (1 << 3) /* Event counter can be read at EL0 */
>
> +/*
> + * PMCNTENSET: Count Enable set reg
> + */
> +#define ARMV8_PMU_CNTENSET_C    (1 << 31) /* Cycle counter enable bit */
> +
>  /* PMMIR_EL1.SLOTS mask */
>  #define ARMV8_PMU_SLOTS_MASK   0xff
>
> --
> 2.39.1.581.gbfd45094c4-goog
>