linux-kernel - Re: [PATCHv4 07/48] thermal: core: move passive attr to tz->device.groups

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Date:	Thu, 16 Jun 2016 11:27:50 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Keerthy <a0393675@...com>
Subject: Re: [PATCHv4 07/48] thermal: core: move passive attr to
 tz->device.groups

On 一, 2016-05-30 at 23:18 -0700, Eduardo Valentin wrote:
> This patch moves the passive attribute to tz->device.groups. Moving
> the
> passive attribute also requires a .is_visible() callback
> implementation
> for its attribute group.
> 
> The logic behind the visibility of passive attribute is kept the
> same.
> We only expose the passive attribute if the thermal driver has
> exposed
> at least one passive trip point.
> 
No, the passive attribute is only present for zones in which the
passive cooling policy is not supported by native thermal driver.

> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Eduardo Valentin <edubezval@...il.com>
> ---
>  drivers/thermal/thermal_core.c | 42
> +++++++++++++++++++++++++++++++++---------
>  1 file changed, 33 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c
> index 19fea9e..efc190c 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1056,9 +1056,42 @@ static struct attribute_group
> thermal_zone_mode_attribute_group = {
>  	.is_visible = thermal_zone_mode_is_visible,
>  };
>  
> +/* We expose passive only if passive trips are present */
> +static struct attribute *thermal_zone_passive_attrs[] = {
> +	&dev_attr_passive.attr,
> +	NULL,
> +};
> +
> +static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
> +					       struct attribute
> *attr,
> +					       int attrno)
> +{
> +	struct device *dev = container_of(kobj, struct device,
> kobj);
> +	struct thermal_zone_device *tz;
> +	enum thermal_trip_type trip_type;
> +	int count;
> +
> +	tz = container_of(dev, struct thermal_zone_device, device);
> +
> +	for (count = 0; count < tz->trips; count++) {
> +		tz->ops->get_trip_type(tz, count, &trip_type);
> +
> +		if (trip_type == THERMAL_TRIP_PASSIVE)
> +			return attr->mode;
we should
			return 0;
> +	}
> +
> +	return 0;
and
	return attr->mode;

thanks,
rui
> +}
> +
> +static struct attribute_group thermal_zone_passive_attribute_group =
> {
> +	.attrs = thermal_zone_passive_attrs,
> +	.is_visible = thermal_zone_passive_is_visible,
> +};
> +
>  static const struct attribute_group *thermal_zone_attribute_groups[]
> = {
>  	&thermal_zone_attribute_group,
>  	&thermal_zone_mode_attribute_group,
> +	&thermal_zone_passive_attribute_group,
>  	NULL
>  };
>  
> @@ -1843,7 +1876,6 @@ struct thermal_zone_device
> *thermal_zone_device_register(const char *type,
>  	int trip_temp;
>  	int result;
>  	int count;
> -	int passive = 0;
>  	struct thermal_governor *governor;
>  
>  	if (!type || strlen(type) == 0)
> @@ -1904,8 +1936,6 @@ struct thermal_zone_device
> *thermal_zone_device_register(const char *type,
>  	for (count = 0; count < trips; count++) {
>  		if (tz->ops->get_trip_type(tz, count, &trip_type))
>  			set_bit(count, &tz->trips_disabled);
> -		if (trip_type == THERMAL_TRIP_PASSIVE)
> -			passive = 1;
>  		if (tz->ops->get_trip_temp(tz, count, &trip_temp))
>  			set_bit(count, &tz->trips_disabled);
>  		/* Check for bogus trip points */
> @@ -1913,12 +1943,6 @@ struct thermal_zone_device
> *thermal_zone_device_register(const char *type,
>  			set_bit(count, &tz->trips_disabled);
>  	}
>  
> -	if (!passive) {
> -		result = device_create_file(&tz->device,
> &dev_attr_passive);
> -		if (result)
> -			goto unregister;
> -	}
> -
>  	/* Update 'this' zone's governor information */
>  	mutex_lock(&thermal_governor_lock);
>