linux-kernel - Re: [PATCH] drivers/perf: Fix ali_drw_pmu driver interrupt status clearing

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Message-ID: <ZsRfdn58mPLRIfVk@J2N7QTR9R3>
Date: Tue, 20 Aug 2024 10:18:46 +0100
From: Mark Rutland <mark.rutland@....com>
To: Jing Zhang <renyu.zj@...ux.alibaba.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will@...nel.org>,
	Shuai Xue <xueshuai@...ux.alibaba.com>
Subject: Re: [PATCH] drivers/perf: Fix ali_drw_pmu driver interrupt status
 clearing

On Mon, Aug 19, 2024 at 07:48:30PM +0800, Jing Zhang wrote:
> The alibaba_uncore_pmu driver forgot to clear all interrupt status
> in the interrupt processing function. After the PMU counter overflow
> interrupt occurred, an interrupt storm occurred, causing the system
> to hang.
> 
> Therefore, clear the correct interrupt status in the interrupt handling
> function to fix it.
> 
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>

Presumably this should have

Fixes: cf7b61073e4526ca ("drivers/perf: add DDR Sub-System Driveway PMU driver for Yitian 710 SoC")

... right?

With that:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
>  drivers/perf/alibaba_uncore_drw_pmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/perf/alibaba_uncore_drw_pmu.c b/drivers/perf/alibaba_uncore_drw_pmu.c
> index 38a2947..c6ff1bc 100644
> --- a/drivers/perf/alibaba_uncore_drw_pmu.c
> +++ b/drivers/perf/alibaba_uncore_drw_pmu.c
> @@ -400,7 +400,7 @@ static irqreturn_t ali_drw_pmu_isr(int irq_num, void *data)
>  			}
>  
>  			/* clear common counter intr status */
> -			clr_status = FIELD_PREP(ALI_DRW_PMCOM_CNT_OV_INTR_MASK, 1);
> +			clr_status = FIELD_PREP(ALI_DRW_PMCOM_CNT_OV_INTR_MASK, status);
>  			writel(clr_status,
>  			       drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_CLR);
>  		}
> -- 
> 1.8.3.1
>