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Message-ID: <CAJLyvQwBvPx4Kp8coEuuACwRMwHG+b3rX=kuxqz4gu6rt-Ex3g@mail.gmail.com>
Date: Thu, 27 Dec 2012 15:01:47 +0800
From: Hongbo Zhang <hongbo.zhang@...aro.org>
To: Durgadoss R <durgadoss.r@...el.com>
Cc: rui.zhang@...el.com, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, wni@...dia.com
Subject: Re: [PATCH 4/8] Thermal: Add Thermal_trip sysfs node
On 18 December 2012 17:29, Durgadoss R <durgadoss.r@...el.com> wrote:
> This patch adds a thermal_trip directory under
> /sys/class/thermal/zoneX. This directory contains
> the trip point values for sensors bound to this
> zone.
>
> Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
> ---
> drivers/thermal/thermal_sys.c | 237 ++++++++++++++++++++++++++++++++++++++++-
> include/linux/thermal.h | 37 +++++++
> 2 files changed, 272 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index b39bf97..29ec073 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -448,6 +448,22 @@ 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->kobj_trip[i]),
> + THERMAL_NAME_LENGTH)) {
> + indx = i;
> + break;
> + }
> + }
> + mutex_unlock(&sensor_list_lock);
> + return indx;
> +}
> +
> static void remove_sensor_from_zone(struct thermal_zone *tz,
> struct thermal_sensor *ts)
> {
> @@ -459,9 +475,15 @@ static void remove_sensor_from_zone(struct thermal_zone *tz,
>
> sysfs_remove_link(&tz->device.kobj, kobject_name(&ts->device.kobj));
>
> + /* Delete this sensor's trip Kobject */
> + kobject_del(tz->kobj_trip[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->kobj_trip[j] = tz->kobj_trip[j + 1];
> + }
>
> tz->sensor_indx--;
> }
> @@ -875,6 +897,120 @@ 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 kobject *kobj, struct kobj_attribute *attr, char *buf)
> +{
> + int i, indx, ret = 0;
> + struct thermal_zone *tz;
> + struct device *dev;
> +
> + /* In this function, for
> + * /sys/class/thermal/zoneX/thermal_trip/sensorY:
> + * attr points to sysfs node 'active'
> + * kobj points to sensorY
> + * kobj->parent points to thermal_trip
> + * kobj->parent->parent points to zoneX
> + */
> +
> + /* Get the zone pointer */
> + dev = container_of(kobj->parent->parent, struct device, kobj);
> + tz = to_zone(dev);
> + if (!tz)
> + return -EINVAL;
> +
> + /*
> + * We need this because in the sysfs tree, 'sensorY' is
> + * not really the sensor pointer. It just has the name
> + * 'sensorY'; whereas 'zoneX' is actually the zone pointer.
> + * This means container_of(kobj, struct device, kobj) will not
> + * provide the actual sensor pointer.
> + */
> + indx = get_sensor_indx_by_kobj(tz, kobject_name(kobj));
> + 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;
> +}
> +
> +static ssize_t
> +ptrip_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
> +{
> + int i, indx, ret = 0;
> + struct thermal_zone *tz;
> + struct device *dev;
> +
> + /* Get the zone pointer */
> + dev = container_of(kobj->parent->parent, struct device, kobj);
> + tz = to_zone(dev);
> + if (!tz)
> + return -EINVAL;
> +
> + indx = get_sensor_indx_by_kobj(tz, kobject_name(kobj));
> + 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;
> +}
> +
> +static ssize_t
> +hot_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
> +{
> + int indx;
> + struct thermal_zone *tz;
> + struct device *dev;
> +
> + /* Get the zone pointer */
> + dev = container_of(kobj->parent->parent, struct device, kobj);
> + tz = to_zone(dev);
> + if (!tz)
> + return -EINVAL;
> +
> + indx = get_sensor_indx_by_kobj(tz, kobject_name(kobj));
> + if (indx < 0)
> + return indx;
> +
> + return sprintf(buf, "%d\n", tz->sensor_trip[indx]->hot);
> +}
> +
> +static ssize_t
> +critical_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
> +{
> + int indx;
> + struct thermal_zone *tz;
> + struct device *dev;
> +
> + /* Get the zone pointer */
> + dev = container_of(kobj->parent->parent, struct device, kobj);
> + tz = to_zone(dev);
> + if (!tz)
> + return -EINVAL;
> +
> + indx = get_sensor_indx_by_kobj(tz, kobject_name(kobj));
> + 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);
> @@ -885,7 +1021,27 @@ 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);
> +
> +/* Thermal trip attributes */
> +static struct kobj_attribute active_attr = __ATTR_RO(active);
> +/* TODO: rename this to passive while removing old code */
> +static struct kobj_attribute passive_attr = __ATTR_RO(ptrip);
> +static struct kobj_attribute hot_attr = __ATTR_RO(hot);
> +static struct kobj_attribute crit_attr = __ATTR_RO(critical);
> +
> +static struct attribute *trip_attrs[] = {
> + &active_attr.attr,
> + &passive_attr.attr,
> + &hot_attr.attr,
> + &crit_attr.attr,
> + NULL,
> + };
> +
> +static struct attribute_group trip_attr_group = {
> + .attrs = trip_attrs,
> + };
>
> /* sys I/F for cooling device */
> #define to_cooling_device(_dev) \
> @@ -1770,12 +1926,19 @@ struct thermal_zone *create_thermal_zone(const char *name, void *devdata)
> if (ret)
> goto exit_unregister;
>
> + tz->kobj_thermal_trip = kobject_create_and_add("thermal_trip",
> + &tz->device.kobj);
> + if (!tz->kobj_thermal_trip)
> + goto exit_name;
> +
> /* Add this zone to the global list of thermal zones */
> mutex_lock(&zone_list_lock);
> list_add_tail(&tz->node, &thermal_zone_list);
> mutex_unlock(&zone_list_lock);
> return tz;
>
> +exit_name:
> + device_remove_file(&tz->device, &dev_attr_zone_name);
> exit_unregister:
> device_unregister(&tz->device);
> exit_idr:
> @@ -1789,6 +1952,7 @@ 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)
> @@ -1809,6 +1973,33 @@ 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 /sys/class/thermal/zoneX/thermal_trip/sensorY */
> + if (tz->kobj_trip[i]) {
> + sysfs_remove_group(tz->kobj_trip[i], &trip_attr_group);
> + kobject_del(tz->kobj_trip[i]);
> + }
> + }
> +
> + /* Remove /sys/class/thermal/zoneX/thermal_trip */
> + kobject_del(tz->kobj_thermal_trip);
> +
> + /* 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);
>
> @@ -1920,6 +2111,48 @@ 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 indx, ret = -EINVAL;
> +
> + if (!tz || !ts || !trip)
> + return ret;
> +
> + mutex_lock(&zone_list_lock);
> +
> + GET_INDEX(tz, ts, indx, sensor);
> + if (indx < 0)
> + goto exit_indx;
> +
> + /* Create kobj for /sys/class/thermal/zoneX/thermal_trip/sensorY */
> + tz->kobj_trip[indx] = kobject_create_and_add(
> + kobject_name(&ts->device.kobj),
> + tz->kobj_thermal_trip);
> + if (!tz->kobj_trip[indx]) {
> + ret = -ENOMEM;
> + goto exit_indx;
> + }
> +
> + ret = sysfs_create_group(tz->kobj_trip[indx], &trip_attr_group);
> + if (ret) {
> + dev_err(&tz->device, "sysfs_create_group failed:%d\n", ret);
> + goto exit_kobj;
> + }
> +
> + tz->sensor_trip[indx] = trip;
> + mutex_unlock(&zone_list_lock);
> + return 0;
> +
> +exit_kobj:
> + kobject_del(tz->kobj_trip[indx]);
> + tz->kobj_trip[indx] = NULL;
> +exit_indx:
> + 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 c4e45c7..8372f05 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -158,6 +158,30 @@ 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
> + */
Durgadoss,
Currently the newly introduced governors don't treat passive/active
differently, what is the idea about this when you rebase governors to
new thermal zone/sensors? handle the passive/active differently or
eliminate the difference?
> +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_sensor {
> char name[THERMAL_NAME_LENGTH];
> int id;
> @@ -215,6 +239,16 @@ 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:
> + * kobj_thermal_trip: /sys/class/thermal/zoneX/thermal_trip
> + * kobj_trip: /sys/class/thermal/zoneX/thermal_trip/sensorY
> + * sensor_trip: trip point information for each sensor
> + */
> + struct kobject *kobj_thermal_trip;
> + struct kobject *kobj_trip[MAX_SENSORS_PER_ZONE];
> + struct thermal_trip_point *sensor_trip[MAX_SENSORS_PER_ZONE];
> };
>
> /* Structure that holds thermal governor information */
> @@ -295,6 +329,9 @@ int add_sensor_to_zone(struct thermal_zone *, struct thermal_sensor *);
>
> int add_cdev_to_zone(struct thermal_zone *, struct thermal_cooling_device *);
>
> +int add_sensor_trip_info(struct thermal_zone *, struct thermal_sensor *,
> + struct thermal_trip_point *);
> +
> #ifdef CONFIG_NET
> extern int thermal_generate_netlink_event(u32 orig, enum events event);
> #else
> --
> 1.7.9.5
>
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