linux-kernel - Re: [PATCH v2] watchdog: sp5100_tco: Add "action" module parameter

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Message-ID: <20220925195440.GB546491@roeck-us.net>
Date:   Sun, 25 Sep 2022 12:54:40 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Vladimir Panteleev <git@...dimir.panteleev.md>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] watchdog: sp5100_tco: Add "action" module parameter

On Tue, Sep 20, 2022 at 09:27:21AM +0000, Vladimir Panteleev wrote:
> Allow configuring the "action" bit, as documented in [1].
> 
> Previously, the only action supported by this module was to reset the
> system (0).  It can now be configured to power off (1) instead.
> 
> [1]: https://www.amd.com/system/files/TechDocs/44413.pdf
> 
> Signed-off-by: Vladimir Panteleev <git@...dimir.panteleev.md>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> 
> Changes since v1:
>  - Drop the rename of the SP5100_WDT_ACTION_RESET define
>  - Make the new parameter not visible in sysfs for consistency
> 
>  drivers/watchdog/sp5100_tco.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
> index ae54dd33e233..fb426b7d81da 100644
> --- a/drivers/watchdog/sp5100_tco.c
> +++ b/drivers/watchdog/sp5100_tco.c
> @@ -65,6 +65,12 @@ static struct pci_dev *sp5100_tco_pci;
>  
>  /* module parameters */
>  
> +#define WATCHDOG_ACTION 0
> +static bool action = WATCHDOG_ACTION;
> +module_param(action, bool, 0);
> +MODULE_PARM_DESC(action, "Action taken when watchdog expires, 0 to reset, 1 to poweroff (default="
> +		 __MODULE_STRING(WATCHDOG_ACTION) ")");
> +
>  #define WATCHDOG_HEARTBEAT 60	/* 60 sec default heartbeat. */
>  static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
>  module_param(heartbeat, int, 0);
> @@ -297,8 +303,11 @@ static int sp5100_tco_timer_init(struct sp5100_tco *tco)
>  	if (val & SP5100_WDT_FIRED)
>  		wdd->bootstatus = WDIOF_CARDRESET;
>  
> -	/* Set watchdog action to reset the system */
> -	val &= ~SP5100_WDT_ACTION_RESET;
> +	/* Set watchdog action */
> +	if (action)
> +		val |= SP5100_WDT_ACTION_RESET;
> +	else
> +		val &= ~SP5100_WDT_ACTION_RESET;
>  	writel(val, SP5100_WDT_CONTROL(tco->tcobase));
>  
>  	/* Set a reasonable heartbeat before we stop the timer */
> -- 
> 2.37.3
>