linux-kernel - Re: [v3 1/5] RISC-V: Fix counter restart during overflow for RV32

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Date:   Tue, 12 Jul 2022 09:45:03 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Atish Patra <atishp@...osinc.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [v3 1/5] RISC-V: Fix counter restart during overflow for RV32

Reviewed-by: Guo Ren <guoren@...nel.org>

On Tue, Jul 12, 2022 at 1:46 AM Atish Patra <atishp@...osinc.com> wrote:
>
> Pass the upper half of the initial value of the counter correctly
> for RV32.
>
> Fixes: 4905ec2fb7e6 ("RISC-V: Add sscofpmf extension support")
>
> Signed-off-by: Atish Patra <atishp@...osinc.com>
> ---
>  drivers/perf/riscv_pmu_sbi.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index dca3537a8dcc..0cb694b794ae 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -525,8 +525,13 @@ static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
>                         hwc = &event->hw;
>                         max_period = riscv_pmu_ctr_get_width_mask(event);
>                         init_val = local64_read(&hwc->prev_count) & max_period;
> +#if defined(CONFIG_32BIT)
> +                       sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
> +                                 flag, init_val, init_val >> 32, 0);
> +#else
>                         sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
>                                   flag, init_val, 0, 0);
> +#endif
>                 }
>                 ctr_ovf_mask = ctr_ovf_mask >> 1;
>                 idx++;
> --
> 2.25.1
>


-- 
Best Regards
 Guo Ren