linux-kernel - Re:Re: [PATCH] softdog: make pretimeout available when SOFT_WATCHDOG

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Date:   Sat, 10 Apr 2021 10:53:28 +0800 (GMT+08:00)
From:   王擎 <wangqing@...o.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] softdog: make pretimeout available when SOFT_WATCHDOG_PRETIMEOUT enabled


>On 4/6/21 2:44 AM, Wang Qing wrote:
>> Although softdog supports pretimeout, there is no way to set pretimeout, 
>> so pretimeout will never be processed in softdog_ping(). 
>> 
>This is wrong. The pretimeout can be set using WDIOC_SETPRETIMEOUT, as with
>every other driver supporting it. There is no need for a module parameter.
>
>Guenter
>
I saw it, but if I use softdog and enable pretimeout, I hope to get pre processing
by default instead of fire. Can we give pretimeout a minimum default value?

Thanks.
Qing wang.

>> Here add the configuration mechanism for pretimeout and the default value
>> is 1 second, so when CONFIG_SOFT_WATCHDOG_PRETIMEOUT is enabled, the 
>> pretimeout function defaults available.
>> 
>> Signed-off-by: Wang Qing <wangqing@...o.com>
>> ---
>>  drivers/watchdog/softdog.c | 11 +++++++++++
>>  1 file changed, 11 insertions(+)
>> 
>> diff --git a/drivers/watchdog/softdog.c b/drivers/watchdog/softdog.c
>> index 7a10962..79e52791
>> --- a/drivers/watchdog/softdog.c
>> +++ b/drivers/watchdog/softdog.c
>> @@ -35,6 +35,14 @@ MODULE_PARM_DESC(soft_margin,
>>  	"Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="
>>  					__MODULE_STRING(TIMER_MARGIN) ")");
>>  
>> +#ifdef CONFIG_SOFT_WATCHDOG_PRETIMEOUT
>> +#define PRE_TIMER_MARGIN	1		/* Default is 1 seconds */
>> +static unsigned int soft_pretimeout = PRE_TIMER_MARGIN;	/* in seconds */
>> +module_param(soft_pretimeout, uint, 0);
>> +MODULE_PARM_DESC(soft_pretimeout,
>> +	"Watchdog soft_pretimeout in seconds. (0 < soft_pretimeout < soft_margin, default=1)");
>> +#endif
>> +
>>  static bool nowayout = WATCHDOG_NOWAYOUT;
>>  module_param(nowayout, bool, 0);
>>  MODULE_PARM_DESC(nowayout,
>> @@ -177,6 +185,9 @@ static struct watchdog_device softdog_dev = {
>>  	.min_timeout = 1,
>>  	.max_timeout = 65535,
>>  	.timeout = TIMER_MARGIN,
>> +#ifdef CONFIG_SOFT_WATCHDOG_PRETIMEOUT
>> +	.pretimeout = PRE_TIMER_MARGIN,
>> +#endif
>>  };
>>  
>>  static int __init softdog_init(void)
>> 
>