Message-ID: <4D68720C2E767A4AA6A8796D42C8EB59293FDE@BGSMSX101.gar.corp.intel.com>
Date:	Fri, 1 Mar 2013 15:34:26 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Eduardo Valentin <eduardo.valentin@...com>
CC:	"Zhang, Rui" <rui.zhang@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hongbo.zhang@...aro.org" <hongbo.zhang@...aro.org>,
	"wni@...dia.com" <wni@...dia.com>
Subject: RE: [PATCH 4/8] Thermal: Add trip point sysfs nodes for sensor

> -----Original Message-----
> From: linux-pm-owner@...r.kernel.org [mailto:linux-pm-
> owner@...r.kernel.org] On Behalf Of Eduardo Valentin
> Sent: Friday, March 01, 2013 1:21 AM
> To: R, Durgadoss
> Cc: Zhang, Rui; linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> hongbo.zhang@...aro.org; wni@...dia.com
> Subject: Re: [PATCH 4/8] Thermal: Add trip point sysfs nodes for sensor
> 
> Durga,
> 
> 
> Same comments on patch 02/08 I want to rise here:
> - Minors on strlcpy, snprintf, devm_ helpers
> - documentation in the code for these helper functions and also better
> naming..
> 
> 
> On 05-02-2013 06:46, Durgadoss R wrote:
> > This patch adds a trip point related sysfs nodes
> > for each sensor under a zone in /sys/class/thermal/zoneX/.
> > The nodes will be named, sensorX_trip_active,
> > sensorX_trip_passive, sensorX_trip_hot, sensorX_trip_critical
> > for active, passive, hot and critical trip points
> > respectively for sensorX.
> >
> > Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
> > ---
> >   drivers/thermal/thermal_sys.c |  225
> ++++++++++++++++++++++++++++++++++++++++-
> >   include/linux/thermal.h       |   38 ++++++-
> >   2 files changed, 260 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> > index bf703b1..69a60a4 100644
> > --- a/drivers/thermal/thermal_sys.c
> > +++ b/drivers/thermal/thermal_sys.c
> > @@ -452,6 +452,37 @@ static void thermal_zone_device_check(struct
> work_struct *work)
> >   	thermal_zone_device_update(tz);
> >   }
> >
> > +static int get_sensor_indx_by_kobj(struct thermal_zone *tz, const char
> *name)
> > +{
> > +	int i, indx = -EINVAL;
> > +
> > +	mutex_lock(&sensor_list_lock);
> > +	for (i = 0; i < tz->sensor_indx; i++) {
> > +		if (!strnicmp(name, kobject_name(&tz->sensors[i]-
> >device.kobj),
> > +					THERMAL_NAME_LENGTH)) {
> > +			indx = i;
> > +			break;
> > +		}
> > +	}
> > +	mutex_unlock(&sensor_list_lock);
> > +	return indx;
> > +}
> > +
> > +static void inline __remove_trip_attr(struct thermal_zone *tz, int indx)
> I believe the preferred format would be:

Ok, will change..

> 
> static inline void __remove_trip_attr(struct thermal_zone *tz, int indx)
> 
> > +{
> > +	int i;
> > +	struct thermal_trip_attr *attr = tz->trip_attr[indx];
> > +
> > +	if (!attr)
> > +		return;
> > +
> > +	for (i = 0; i < NUM_TRIP_TYPES; i++)
> > +		device_remove_file(&tz->device, &attr->attrs[i].attr);
> > +
> > +	kfree(tz->trip_attr[indx]);
> > +	tz->trip_attr[indx] = NULL;
> > +}
> > +
> >   static void remove_sensor_from_zone(struct thermal_zone *tz,
> >   				struct thermal_sensor *ts)
> >   {
> > @@ -463,9 +494,15 @@ static void remove_sensor_from_zone(struct
> thermal_zone *tz,
> >
> >   	sysfs_remove_link(&tz->device.kobj, kobject_name(&ts-
> >device.kobj));
> >
> > +	/* Remove trip point attributes associated with this sensor */
> > +	__remove_trip_attr(tz, indx);
> > +
> >   	/* Shift the entries in the tz->sensors array */
> > -	for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++)
> > +	for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++) {
> >   		tz->sensors[j] = tz->sensors[j + 1];
> > +		tz->sensor_trip[j] = tz->sensor_trip[j + 1];
> > +		tz->trip_attr[j] = tz->trip_attr[j + 1];
> > +	}
> >
> >   	tz->sensor_indx--;
> >   }
> > @@ -879,6 +916,99 @@ policy_show(struct device *dev, struct
> device_attribute *devattr, char *buf)
> >   	return sprintf(buf, "%s\n", tz->governor->name);
> >   }
> >
> > +static ssize_t
> > +active_show(struct device *dev, struct device_attribute *attr, char *buf)
> > +{
> > +	int i, indx, ret = 0;
> > +	char kobj_name[THERMAL_NAME_LENGTH];
> > +	struct thermal_zone *tz = to_zone(dev);
> > +
> > +	if (!sscanf(attr->attr.name, "sensor%d_trip_active", &i))
> > +		return -EINVAL;
> > +
> > +	snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", i);
> > +	indx = get_sensor_indx_by_kobj(tz, kobj_name);
> > +	if (indx < 0)
> > +		return indx;
> > +
> > +	if (tz->sensor_trip[indx]->num_active_trips <= 0)
> > +		return sprintf(buf, "<Not available>\n");
> > +
> > +	ret += sprintf(buf, "0x%x", tz->sensor_trip[indx]->active_trip_mask);
> > +	for (i = 0; i < tz->sensor_trip[indx]->num_active_trips; i++) {
> > +		ret += sprintf(buf + ret, " %d",
> > +			tz->sensor_trip[indx]->active_trips[i]);
> > +	}
> > +
> > +	ret += sprintf(buf + ret, "\n");
> > +	return ret;
> > +}
> > +
> 
> I believe the above function violates sysfs rules, no? Each and every
> file must contain only 1 value..

Yes, re-working this and similar thing in 05/08 in next version.

Thanks,
Durga

> 
> > +static ssize_t
> > +ptrip_show(struct device *dev, struct device_attribute *attr, char *buf)
> > +{
> > +	int i, indx, ret = 0;
> > +	char kobj_name[THERMAL_NAME_LENGTH];
> > +	struct thermal_zone *tz = to_zone(dev);
> > +
> > +	if (!sscanf(attr->attr.name, "sensor%d_trip_passive", &i))
> > +		return -EINVAL;
> > +
> > +	snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", i);
> > +	indx = get_sensor_indx_by_kobj(tz, kobj_name);
> > +	if (indx < 0)
> > +		return indx;
> > +
> > +	if (tz->sensor_trip[indx]->num_passive_trips <= 0)
> > +		return sprintf(buf, "<Not available>\n");
> > +
> > +	for (i = 0; i < tz->sensor_trip[indx]->num_passive_trips; i++) {
> > +		ret += sprintf(buf + ret, "%d ",
> > +			tz->sensor_trip[indx]->passive_trips[i]);
> > +	}
> > +
> > +	ret += sprintf(buf + ret, "\n");
> > +	return ret;
> > +}
> 
> 
> ditto.
> 
> > +
> > +static ssize_t
> > +hot_show(struct device *dev, struct device_attribute *attr, char *buf)
> > +{
> > +	int indx;
> > +	char kobj_name[THERMAL_NAME_LENGTH];
> > +	struct thermal_zone *tz = to_zone(dev);
> > +
> > +	if (!sscanf(attr->attr.name, "sensor%d_trip_hot", &indx))
> > +		return -EINVAL;
> > +
> > +	snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", indx);
> > +
> > +	indx = get_sensor_indx_by_kobj(tz, kobj_name);
> > +	if (indx < 0)
> > +		return indx;
> > +
> > +	return sprintf(buf, "%d\n", tz->sensor_trip[indx]->hot);
> > +}
> > +
> > +static ssize_t
> > +critical_show(struct device *dev, struct device_attribute *attr, char *buf)
> > +{
> > +	int indx;
> > +	char kobj_name[THERMAL_NAME_LENGTH];
> > +	struct thermal_zone *tz = to_zone(dev);
> > +
> > +	if (!sscanf(attr->attr.name, "sensor%d_trip_critical", &indx))
> > +		return -EINVAL;
> > +
> > +	snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", indx);
> > +
> > +	indx = get_sensor_indx_by_kobj(tz, kobj_name);
> > +	if (indx < 0)
> > +		return indx;
> > +
> > +	return sprintf(buf, "%d\n", tz->sensor_trip[indx]->crit);
> > +}
> > +
> >   static DEVICE_ATTR(type, 0444, type_show, NULL);
> >   static DEVICE_ATTR(temp, 0444, temp_show, NULL);
> >   static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
> > @@ -889,7 +1019,8 @@ static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR,
> policy_show, policy_store);
> >   static DEVICE_ATTR(sensor_name, 0444, sensor_name_show, NULL);
> >   static DEVICE_ATTR(temp_input, 0444, sensor_temp_show, NULL);
> >
> > -static DEVICE_ATTR(zone_name, 0444, zone_name_show, NULL);
> > +/* Thermal zone attributes */
> > +static DEVICE_ATTR(zone_name, S_IRUGO, zone_name_show, NULL);
> >
> >   /* sys I/F for cooling device */
> >   #define to_cooling_device(_dev)	\
> > @@ -1744,6 +1875,38 @@ static int enable_sensor_thresholds(struct
> thermal_sensor *ts, int count)
> >   	return 0;
> >   }
> >
> > +static int create_sensor_trip_attrs(struct thermal_zone *tz,
> > +				struct thermal_trip_attr *attr, int indx)
> > +{
> > +	int i, ret;
> > +	static const char *const names[NUM_TRIP_TYPES] = {
> > +				"sensor%d_trip_active",
> > +				"sensor%d_trip_passive",
> > +				"sensor%d_trip_hot",
> > +				"sensor%d_trip_critical",
> > +				};
> > +	static ssize_t (*const rd_ptr[NUM_TRIP_TYPES]) (struct device *dev,
> > +			struct device_attribute *devattr, char *buf) = {
> > +			active_show, ptrip_show, hot_show, critical_show};
> > +
> > +	for (i = 0; i < NUM_TRIP_TYPES; i++) {
> > +		snprintf(attr->attrs[i].name, THERMAL_NAME_LENGTH,
> names[i],
> > +			indx);
> > +		sysfs_attr_init(&attr->attrs[i].attr.attr);
> > +		attr->attrs[i].attr.attr.name = attr->attrs[i].name;
> > +		attr->attrs[i].attr.attr.mode = S_IRUGO;
> > +		attr->attrs[i].attr.show = rd_ptr[i];
> > +		ret = device_create_file(&tz->device, &attr->attrs[i].attr);
> > +		if (ret)
> > +			goto exit;
> > +	}
> > +	return 0;
> > +exit:
> > +	while (--i >= 0)
> > +		device_remove_file(&tz->device, &attr->attrs[i].attr);
> > +	return ret;
> > +}
> > +
> >   struct thermal_zone *create_thermal_zone(const char *name, void
> *devdata)
> >   {
> >   	struct thermal_zone *tz;
> > @@ -1793,6 +1956,7 @@ EXPORT_SYMBOL(create_thermal_zone);
> >   void remove_thermal_zone(struct thermal_zone *tz)
> >   {
> >   	struct thermal_zone *pos, *next;
> > +	int i;
> >   	bool found = false;
> >
> >   	if (!tz)
> > @@ -1813,6 +1977,23 @@ void remove_thermal_zone(struct
> thermal_zone *tz)
> >
> >   	device_remove_file(&tz->device, &dev_attr_zone_name);
> >
> > +	/* Just for ease of usage */
> > +	i = tz->sensor_indx;
> > +	while (--i >= 0) {
> > +		/* Remove /sys/class/thermal/zoneX/sensorY */
> > +		sysfs_remove_link(&tz->device.kobj,
> > +				kobject_name(&tz->sensors[i]-
> >device.kobj));
> > +		__remove_trip_attr(tz, i);
> > +	}
> > +
> > +	/* Release the cdevs attached to this zone */
> > +	i = tz->cdev_indx;
> > +	while (--i >= 0) {
> > +		/* Remove /sys/class/thermal/zoneX/cooling_deviceY */
> > +		sysfs_remove_link(&tz->device.kobj,
> > +				kobject_name(&tz->cdevs[i]->device.kobj));
> > +	}
> > +
> >   	release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id);
> >   	idr_destroy(&tz->idr);
> >
> > @@ -1924,6 +2105,46 @@ exit_zone:
> >   }
> >   EXPORT_SYMBOL(add_cdev_to_zone);
> >
> > +int add_sensor_trip_info(struct thermal_zone *tz, struct thermal_sensor
> *ts,
> > +			struct thermal_trip_point *trip)
> > +{
> > +	int ret, indx, kobj_indx;
> > +
> > +	if (!tz || !ts || !trip)
> > +		return -EINVAL;
> > +
> > +	if (!sscanf(kobject_name(&ts->device.kobj), "sensor%d",
> &kobj_indx))
> > +		return -EINVAL;
> > +
> > +	mutex_lock(&zone_list_lock);
> > +
> > +	indx = GET_INDEX(tz, ts, sensor);
> > +	if (indx < 0) {
> > +		ret = -EINVAL;
> > +		goto exit;
> > +	}
> > +
> > +	tz->trip_attr[indx] = kzalloc(sizeof(struct thermal_trip_attr),
> > +					GFP_KERNEL);
> > +	if (!tz->trip_attr[indx]) {
> > +		ret = -ENOMEM;
> > +		goto exit;
> > +	}
> > +
> > +	ret = create_sensor_trip_attrs(tz, tz->trip_attr[indx], kobj_indx);
> > +	if (ret) {
> > +		kfree(tz->trip_attr[indx]);
> > +		goto exit;
> > +	}
> > +
> > +	tz->sensor_trip[indx] = trip;
> > +
> > +exit:
> > +	mutex_unlock(&zone_list_lock);
> > +	return ret;
> > +}
> > +EXPORT_SYMBOL(add_sensor_trip_info);
> > +
> >   /**
> >    * thermal_sensor_register - register a new thermal sensor
> >    * @name:	name of the thermal sensor
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index c841414..2f68018 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -31,7 +31,8 @@
> >
> >   #define THERMAL_TRIPS_NONE	-1
> >   #define THERMAL_MAX_TRIPS	12
> > -#define THERMAL_NAME_LENGTH	20
> > +#define THERMAL_NAME_LENGTH	22
> > +#define NUM_TRIP_TYPES		4
> >
> >   /* No upper/lower limit requirement */
> >   #define THERMAL_NO_LIMIT	-1UL
> > @@ -166,6 +167,34 @@ struct thermal_attr {
> >   	char name[THERMAL_NAME_LENGTH];
> >   };
> >
> > +/*
> > + * This structure defines the trip points for a sensor.
> > + * The actual values for these trip points come from
> > + * platform characterization. The thermal governors
> > + * (either kernel or user space) may take appropriate
> > + * actions when the sensors reach these trip points.
> > + * See Documentation/thermal/sysfs-api2.txt for more details.
> > + *
> > + * As of now, For a particular sensor, we support:
> > + * a) 1 hot trip point
> > + * b) 1 critical trip point
> > + * c) 'n' passive trip points
> > + * d) 'm' active trip points
> > + */
> > +struct thermal_trip_point {
> > +	int hot;
> > +	int crit;
> > +	int num_passive_trips;
> > +	int *passive_trips;
> > +	int num_active_trips;
> > +	int *active_trips;
> > +	int active_trip_mask;
> > +};
> > +
> > +struct thermal_trip_attr {
> > +	struct thermal_attr attrs[NUM_TRIP_TYPES];
> > +};
> > +
> >   struct thermal_sensor {
> >   	char name[THERMAL_NAME_LENGTH];
> >   	int id;
> > @@ -223,6 +252,10 @@ struct thermal_zone {
> >   	/* cdev level information */
> >   	int cdev_indx; /* index into 'cdevs' array */
> >   	struct thermal_cooling_device *cdevs[MAX_CDEVS_PER_ZONE];
> > +
> > +	/* Thermal sensors trip information */
> > +	struct thermal_trip_point *sensor_trip[MAX_SENSORS_PER_ZONE];
> > +	struct thermal_trip_attr *trip_attr[MAX_SENSORS_PER_ZONE];
> >   };
> >
> >   /* Structure that holds thermal governor information */
> > @@ -305,6 +338,9 @@ struct thermal_sensor
> *get_sensor_by_name(const char *);
> >   int add_cdev_to_zone(struct thermal_zone *, struct
> thermal_cooling_device *);
> >   struct thermal_cooling_device *get_cdev_by_name(const char *);
> >
> > +int add_sensor_trip_info(struct thermal_zone *, struct thermal_sensor *,
> > +			struct thermal_trip_point *);
> > +
> >   #ifdef CONFIG_NET
> >   extern int thermal_generate_netlink_event(struct thermal_zone_device
> *tz,
> >   						enum events event);
> >
> 
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