linux-kernel - Re: [PATCH v3] bus: omap_l3_smx: identify timeout cause before rebooting

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Message-ID: <20230802133659.kelu7tfz27ovi364@mercury.elektranox.org>
Date:   Wed, 2 Aug 2023 15:36:59 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     "Sicelo A. Mhlongo" <absicsz@...il.com>
Cc:     linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        maemo-leste@...ts.dyne.org
Subject: Re: [PATCH v3] bus: omap_l3_smx: identify timeout cause before
 rebooting

Hi,

On Tue, Aug 01, 2023 at 09:22:40PM +0200, Sicelo A. Mhlongo wrote:
> Identify and print the error source before rebooting the board due to an l3
> timeout error. This is helpful when debugging, e.g. via serial.
> 
> Signed-off-by: Sicelo A. Mhlongo <absicsz@...il.com>
> ---
>  drivers/bus/omap_l3_smx.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)

nice, adding features with a negative diffstat :)

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

> diff --git a/drivers/bus/omap_l3_smx.c b/drivers/bus/omap_l3_smx.c
> index bb1606f5ce2d..8e1a38bfcd8b 100644
> --- a/drivers/bus/omap_l3_smx.c
> +++ b/drivers/bus/omap_l3_smx.c
> @@ -166,19 +166,10 @@ static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
>  	irqreturn_t ret = IRQ_NONE;
>  
>  	int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
> -	if (!int_type) {
> +	if (!int_type)
>  		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
> -		/*
> -		 * if we have a timeout error, there's nothing we can
> -		 * do besides rebooting the board. So let's BUG on any
> -		 * of such errors and handle the others. timeout error
> -		 * is severe and not expected to occur.
> -		 */
> -		BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
> -	} else {
> +	else
>  		status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
> -		/* No timeout error for debug sources */
> -	}
>  
>  	/* identify the error source */
>  	err_source = __ffs(status);
> @@ -190,6 +181,14 @@ static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
>  		ret |= omap3_l3_block_irq(l3, error, error_addr);
>  	}
>  
> +	/*
> +	 * if we have a timeout error, there's nothing we can
> +	 * do besides rebooting the board. So let's BUG on any
> +	 * of such errors and handle the others. timeout error
> +	 * is severe and not expected to occur.
> +	 */
> +	BUG_ON(!int_type && status & L3_STATUS_0_TIMEOUT_MASK);
> +
>  	/* Clear the status register */
>  	clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
>  		L3_AGENT_STATUS_CLEAR_TA;
> -- 
> 2.40.1
> 

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