linux-kernel - Re: [PATCH 5/5] watchdog: diag288_wdt: unify lpar and zvm diag288 helpers

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Message-ID: <ef9e6cfb-7b08-d649-feb0-0a56b81770e7@roeck-us.net>
Date:   Fri, 3 Feb 2023 10:37:08 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alexander Egorenkov <egorenar@...ux.ibm.com>,
        wim@...ux-watchdog.org
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        hca@...ux.ibm.com
Subject: Re: [PATCH 5/5] watchdog: diag288_wdt: unify lpar and zvm diag288
 helpers

On 2/2/23 23:39, Alexander Egorenkov wrote:
> Change naming of the internal diag288 helper functions
> to improve overall readability and reduce confusion:
> * Rename __diag288() to diag288().
> * Get rid of the misnamed helper __diag288_lpar() that was used not only
>    on LPARs but also zVM and KVM systems.
> * Rename __diag288_vm() to diag288_str().
> 
> Reviewed-by: Heiko Carstens <hca@...ux.ibm.com>
> Signed-off-by: Alexander Egorenkov <egorenar@...ux.ibm.com>

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

> ---
>   drivers/watchdog/diag288_wdt.c | 32 +++++++++++++-------------------
>   1 file changed, 13 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/watchdog/diag288_wdt.c b/drivers/watchdog/diag288_wdt.c
> index a29ad164b27a..4631d0a3866a 100644
> --- a/drivers/watchdog/diag288_wdt.c
> +++ b/drivers/watchdog/diag288_wdt.c
> @@ -71,8 +71,8 @@ MODULE_ALIAS("vmwatchdog");
>   
>   static char *cmd_buf;
>   
> -static int __diag288(unsigned int func, unsigned int timeout,
> -		     unsigned long action, unsigned int len)
> +static int diag288(unsigned int func, unsigned int timeout,
> +		   unsigned long action, unsigned int len)
>   {
>   	union register_pair r1 = { .even = func, .odd = timeout, };
>   	union register_pair r3 = { .even = action, .odd = len, };
> @@ -92,7 +92,7 @@ static int __diag288(unsigned int func, unsigned int timeout,
>   	return err;
>   }
>   
> -static int __diag288_vm(unsigned int  func, unsigned int timeout, char *cmd)
> +static int diag288_str(unsigned int func, unsigned int timeout, char *cmd)
>   {
>   	ssize_t len;
>   
> @@ -102,13 +102,7 @@ static int __diag288_vm(unsigned int  func, unsigned int timeout, char *cmd)
>   	ASCEBC(cmd_buf, MAX_CMDLEN);
>   	EBC_TOUPPER(cmd_buf, MAX_CMDLEN);
>   
> -	return __diag288(func, timeout, virt_to_phys(cmd_buf), len);
> -}
> -
> -static int __diag288_lpar(unsigned int func, unsigned int timeout,
> -			  unsigned long action)
> -{
> -	return __diag288(func, timeout, action, 0);
> +	return diag288(func, timeout, virt_to_phys(cmd_buf), len);
>   }
>   
>   static int wdt_start(struct watchdog_device *dev)
> @@ -119,11 +113,10 @@ static int wdt_start(struct watchdog_device *dev)
>   	if (MACHINE_IS_VM) {
>   		func = conceal_on ? (WDT_FUNC_INIT | WDT_FUNC_CONCEAL)
>   			: WDT_FUNC_INIT;
> -		ret = __diag288_vm(func, dev->timeout, wdt_cmd);
> +		ret = diag288_str(func, dev->timeout, wdt_cmd);
>   		WARN_ON(ret != 0);
>   	} else {
> -		ret = __diag288_lpar(WDT_FUNC_INIT,
> -				     dev->timeout, LPARWDT_RESTART);
> +		ret = diag288(WDT_FUNC_INIT, dev->timeout, LPARWDT_RESTART, 0);
>   	}
>   
>   	if (ret) {
> @@ -135,7 +128,7 @@ static int wdt_start(struct watchdog_device *dev)
>   
>   static int wdt_stop(struct watchdog_device *dev)
>   {
> -	return __diag288(WDT_FUNC_CANCEL, 0, 0, 0);
> +	return diag288(WDT_FUNC_CANCEL, 0, 0, 0);
>   }
>   
>   static int wdt_ping(struct watchdog_device *dev)
> @@ -152,10 +145,10 @@ static int wdt_ping(struct watchdog_device *dev)
>   		func = conceal_on ? (WDT_FUNC_INIT | WDT_FUNC_CONCEAL)
>   			: WDT_FUNC_INIT;
>   
> -		ret = __diag288_vm(func, dev->timeout, wdt_cmd);
> +		ret = diag288_str(func, dev->timeout, wdt_cmd);
>   		WARN_ON(ret != 0);
>   	} else {
> -		ret = __diag288_lpar(WDT_FUNC_CHANGE, dev->timeout, 0);
> +		ret = diag288(WDT_FUNC_CHANGE, dev->timeout, 0, 0);
>   	}
>   
>   	if (ret)
> @@ -206,20 +199,21 @@ static int __init diag288_init(void)
>   			return -ENOMEM;
>   		}
>   
> -		ret = __diag288_vm(WDT_FUNC_INIT, MIN_INTERVAL, "BEGIN");
> +		ret = diag288_str(WDT_FUNC_INIT, MIN_INTERVAL, "BEGIN");
>   		if (ret != 0) {
>   			pr_err("The watchdog cannot be initialized\n");
>   			kfree(cmd_buf);
>   			return -EINVAL;
>   		}
>   	} else {
> -		if (__diag288_lpar(WDT_FUNC_INIT, 30, LPARWDT_RESTART)) {
> +		if (diag288(WDT_FUNC_INIT, WDT_DEFAULT_TIMEOUT,
> +			    LPARWDT_RESTART, 0)) {
>   			pr_err("The watchdog cannot be initialized\n");
>   			return -EINVAL;
>   		}
>   	}
>   
> -	if (__diag288_lpar(WDT_FUNC_CANCEL, 0, 0)) {
> +	if (diag288(WDT_FUNC_CANCEL, 0, 0, 0)) {
>   		pr_err("The watchdog cannot be deactivated\n");
>   		return -EINVAL;
>   	}