linux-kernel - Re: [PATCH 5/5] firmware: xilinx: Add sysfs and IOCTL to set boot health status

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Message-ID: <51ff29cd-3ac5-7d45-cb26-946252bcf622@xilinx.com>
Date:   Wed, 18 Dec 2019 15:28:16 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Jolly Shah <jolly.shah@...inx.com>, ard.biesheuvel@...aro.org,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        matt@...eblueprint.co.uk, sudeep.holla@....com,
        hkallweit1@...il.com, keescook@...omium.org,
        dmitry.torokhov@...il.com, michal.simek@...inx.com
Cc:     rajanv@...inx.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rajan Vaja <rajan.vaja@...inx.com>
Subject: Re: [PATCH 5/5] firmware: xilinx: Add sysfs and IOCTL to set boot
 health status

On 05. 12. 19 0:29, Jolly Shah wrote:
> From: Rajan Vaja <rajan.vaja@...inx.com>
> 
> Add sysfs interface to set boot health status from userspace.
> Add IOCTL ID used by this interface to communicate with firmware.
> 
> If PMUFW is compiled with CHECK_HEALTHY_BOOT, it will check the
> healthy bit on FPD WDT expiration. If healthy bit is set by a user
> application running in Linux, PMUFW will do APU only restart. If
> healthy bit is not set during FPD WDT expiration, PMUFW will do
> system restart.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>

Rajan should be the first.

> Signed-off-by: Jolly Shah <jolly.shah@...inx.com>
> ---
>  Documentation/ABI/stable/sysfs-firmware-zynqmp | 21 +++++++++++++
>  drivers/firmware/xilinx/zynqmp.c               | 42 ++++++++++++++++++++++++++
>  include/linux/firmware/xlnx-zynqmp.h           |  2 ++
>  3 files changed, 65 insertions(+)
> 
> diff --git a/Documentation/ABI/stable/sysfs-firmware-zynqmp b/Documentation/ABI/stable/sysfs-firmware-zynqmp
> index 13e4fd2..eeae291 100644
> --- a/Documentation/ABI/stable/sysfs-firmware-zynqmp
> +++ b/Documentation/ABI/stable/sysfs-firmware-zynqmp
> @@ -80,3 +80,24 @@ Description:
>  		# echo "subsystem" > /sys/firmware/zynqmp/shutdown_scope
>  
>  Users:		Xilinx
> +
> +What:		/sys/firmware/zynqmp/health_status
> +Date:		April 2018
> +KernelVersion:	4.14.0

ditto

> +Contact:	"Rajan Vaja" <rajanv@...inx.com>
> +Description:
> +		This sysfs interface allows to set the health status. If PMUFW
> +		is compiled with CHECK_HEALTHY_BOOT, it will check the healthy
> +		bit on FPD WDT expiration. If healthy bit is set by a user
> +		application running in Linux, PMUFW will do APU only restart. If
> +		healthy bit is not set during FPD WDT expiration, PMUFW will do
> +		system restart.
> +
> +		Usage:
> +		Set healty bit

healthy

> +		# echo 1 > /sys/firmware/zynqmp/health_status
> +
> +		Unset healty bit

ditto.

> +		# echo 0 > /sys/firmware/zynqmp/health_status
> +
> +Users:		Xilinx
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index b23bda4..4e497a3 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -479,6 +479,7 @@ static inline int zynqmp_is_valid_ioctl(u32 ioctl_id)
>  	case IOCTL_READ_GGS:
>  	case IOCTL_WRITE_PGGS:
>  	case IOCTL_READ_PGGS:
> +	case IOCTL_SET_BOOT_HEALTH_STATUS:
>  		return 1;
>  	default:
>  		return 0;
> @@ -886,6 +887,46 @@ static struct kobj_attribute zynqmp_attr_shutdown_scope =
>  						__ATTR_RW(shutdown_scope);
>  
>  /**
> + * health_status_store - Store health_status sysfs attribute
> + * @kobj:	Kobject structure
> + * @attr:	Kobject attribute structure
> + * @buf:	User entered health_status attribute string
> + * @count:	Buffer size
> + *
> + * User-space interface for setting the boot health status.
> + * Usage: echo <value> > /sys/firmware/zynqmp/health_status
> + *
> + * Value:
> + *	1 - Set healthy bit to 1
> + *	0 - Unset healthy bit
> + *
> + * Return:	count argument if request succeeds, the corresponding error
> + *		code otherwise
> + */
> +static ssize_t health_status_store(struct kobject *kobj,
> +				   struct kobj_attribute *attr,
> +				   const char *buf, size_t count)
> +{
> +	int ret;
> +	unsigned int value;
> +
> +	ret = kstrtouint(buf, 10, &value);
> +	if (ret)
> +		return ret;
> +
> +	ret = zynqmp_pm_ioctl(0, IOCTL_SET_BOOT_HEALTH_STATUS, value, 0, NULL);
> +	if (ret) {
> +		pr_err("unable to set healthy bit value to %u\n", value);
> +		return ret;
> +	}
> +
> +	return count;
> +}
> +
> +static struct kobj_attribute zynqmp_attr_health_status =
> +						__ATTR_WO(health_status);

ditto.

> +
> +/**
>   * config_reg_store - Write config_reg sysfs attribute
>   * @kobj:	Kobject structure
>   * @attr:	Kobject attribute structure
> @@ -1011,6 +1052,7 @@ static struct kobj_attribute zynqmp_attr_config_reg =
>  
>  static struct attribute *attrs[] = {
>  	&zynqmp_attr_shutdown_scope.attr,
> +	&zynqmp_attr_health_status.attr,
>  	&zynqmp_attr_config_reg.attr,
>  	NULL,
>  };
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 54061de..c6f3c50 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -107,6 +107,8 @@ enum pm_ioctl_id {
>  	IOCTL_READ_GGS,
>  	IOCTL_WRITE_PGGS,
>  	IOCTL_READ_PGGS,
> +	/* Set healthy bit value*/

<space>*/

> +	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
>  };
>  
>  enum pm_query_id {
> 


M