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Date: Fri, 08 Feb 2013 17:04:30 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: Durgadoss R <durgadoss.r@...el.com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
eduardo.valentin@...com, hongbo.zhang@...aro.org, wni@...dia.com
Subject: Re: [PATCH 5/8] Thermal: Create Thermal map sysfs attributes for a
zone
On Tue, 2013-02-05 at 16:16 +0530, Durgadoss R wrote:
> This patch creates a thermal map sysfs node under
> /sys/class/thermal/zoneX/. This contains
> entries named mapY_trip_type, mapY_sensor_name,
> mapY_cdev_name, mapY_trip_mask, mapY_weights.
sorry I still not quite understand.
does it look like?
/sys/class/thermal/zoneX/
|
map-->|-->map0_trip_type
|...
|-->map0_weight
|-->map1_trip_type
|...
|-->map1_weight
|...
thanks,
rui
>
> Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
> ---
> drivers/thermal/thermal_sys.c | 221 ++++++++++++++++++++++++++++++++++++++++-
> include/linux/thermal.h | 25 +++++
> 2 files changed, 244 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 69a60a4..e284b67 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -525,6 +525,44 @@ static void remove_cdev_from_zone(struct thermal_zone *tz,
> tz->cdev_indx--;
> }
>
> +static inline void __remove_map_entry(struct thermal_zone *tz, int indx)
> +{
> + int i;
> + struct thermal_map_attr *attr = tz->map_attr[indx];
> +
> + for (i = 0; i < NUM_MAP_ATTRS; i++)
> + device_remove_file(&tz->device, &attr->attrs[i].attr);
> +
> + kfree(tz->map_attr[indx]);
> + tz->map[indx] = NULL;
> +}
> +
> +static void remove_sensor_map_entry(struct thermal_zone *tz,
> + struct thermal_sensor *ts)
> +{
> + int i;
> +
> + for (i = 0; i < MAX_MAPS_PER_ZONE; i++) {
> + if (tz->map[i] && !strnicmp(ts->name, tz->map[i]->sensor_name,
> + THERMAL_NAME_LENGTH)) {
> + __remove_map_entry(tz, i);
> + }
> + }
> +}
> +
> +static void remove_cdev_map_entry(struct thermal_zone *tz,
> + struct thermal_cooling_device *cdev)
> +{
> + int i;
> +
> + for (i = 0; i < MAX_MAPS_PER_ZONE; i++) {
> + if (tz->map[i] && !strnicmp(cdev->type, tz->map[i]->cdev_name,
> + THERMAL_NAME_LENGTH)) {
> + __remove_map_entry(tz, i);
> + }
> + }
> +}
> +
> /* sys I/F for thermal zone */
>
> #define to_thermal_zone(_dev) \
> @@ -917,6 +955,107 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
> }
>
> static ssize_t
> +map_ttype_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + char *trip;
> + int indx;
> + struct thermal_zone *tz = to_zone(dev);
> +
> + if (!sscanf(attr->attr.name, "map%d_trip_type", &indx))
> + return -EINVAL;
> +
> + if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
> + return -EINVAL;
> +
> + if (!tz->map[indx])
> + return sprintf(buf, "<Unavailable>\n");
> +
> + trip = (tz->map[indx]->trip_type == THERMAL_TRIP_ACTIVE) ?
> + "active" : "passive";
> + return sprintf(buf, "%s\n", trip);
> +}
> +
> +static ssize_t map_ts_name_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + int indx;
> + struct thermal_zone *tz = to_zone(dev);
> +
> + if (!sscanf(attr->attr.name, "map%d_sensor_name", &indx))
> + return -EINVAL;
> +
> + if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
> + return -EINVAL;
> +
> + if (!tz->map[indx])
> + return sprintf(buf, "<Unavailable>\n");
> +
> + return sprintf(buf, "%s\n", tz->map[indx]->sensor_name);
> +}
> +
> +static ssize_t map_cdev_name_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + int indx;
> + struct thermal_zone *tz = to_zone(dev);
> +
> + if (!sscanf(attr->attr.name, "map%d_cdev_name", &indx))
> + return -EINVAL;
> +
> + if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
> + return -EINVAL;
> +
> + if (!tz->map[indx])
> + return sprintf(buf, "<Unavailable>\n");
> +
> + return sprintf(buf, "%s\n", tz->map[indx]->cdev_name);
> +}
> +
> +static ssize_t map_trip_mask_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + int indx;
> + struct thermal_zone *tz = to_zone(dev);
> +
> + if (!sscanf(attr->attr.name, "map%d_trip_mask", &indx))
> + return -EINVAL;
> +
> + if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
> + return -EINVAL;
> +
> + if (!tz->map[indx])
> + return sprintf(buf, "<Unavailable>\n");
> +
> + return sprintf(buf, "0x%x\n", tz->map[indx]->trip_mask);
> +}
> +
> +static ssize_t map_weights_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + int i, indx, ret = 0;
> + struct thermal_map *map;
> + struct thermal_zone *tz = to_zone(dev);
> +
> + if (!sscanf(attr->attr.name, "map%d_weights", &indx))
> + return -EINVAL;
> +
> + if (indx < 0 || indx >= MAX_MAPS_PER_ZONE)
> + return -EINVAL;
> +
> + if (!tz->map[indx])
> + return sprintf(buf, "<Unavailable>\n");
> +
> + map = tz->map[indx];
> +
> + ret += sprintf(buf, "%d", map->weights[0]);
> + for (i = 1; i < map->num_weights; i++)
> + ret += sprintf(buf + ret, " %d", map->weights[i]);
> +
> + ret += sprintf(buf + ret, "\n");
> + return ret;
> +}
> +
> +static ssize_t
> active_show(struct device *dev, struct device_attribute *attr, char *buf)
> {
> int i, indx, ret = 0;
> @@ -1655,8 +1794,10 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
>
> mutex_lock(&zone_list_lock);
>
> - for_each_thermal_zone(tmp_tz)
> + for_each_thermal_zone(tmp_tz) {
> remove_cdev_from_zone(tmp_tz, cdev);
> + remove_cdev_map_entry(tmp_tz, cdev);
> + }
>
> mutex_unlock(&zone_list_lock);
>
> @@ -1994,6 +2135,9 @@ void remove_thermal_zone(struct thermal_zone *tz)
> kobject_name(&tz->cdevs[i]->device.kobj));
> }
>
> + for (i = 0; i < MAX_MAPS_PER_ZONE; i++)
> + __remove_map_entry(tz, i);
> +
> release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id);
> idr_destroy(&tz->idr);
>
> @@ -2039,6 +2183,77 @@ struct thermal_sensor *get_sensor_by_name(const char *name)
> }
> EXPORT_SYMBOL(get_sensor_by_name);
>
> +static int create_map_attrs(struct thermal_zone *tz, int indx)
> +{
> + int ret, i;
> + struct thermal_map_attr *attr = tz->map_attr[indx];
> +
> + static const char *const names[NUM_MAP_ATTRS] = { "map%d_trip_type",
> + "map%d_sensor_name", "map%d_cdev_name",
> + "map%d_trip_mask", "map%d_weights" };
> + static ssize_t (*const rd_ptr[NUM_MAP_ATTRS]) (struct device *dev,
> + struct device_attribute *devattr, char *buf) = {
> + map_ttype_show, map_ts_name_show, map_cdev_name_show,
> + map_trip_mask_show, map_weights_show };
> +
> + for (i = 0; i < NUM_MAP_ATTRS; i++) {
> + snprintf(attr->attrs[i].name,
> + THERMAL_NAME_LENGTH, names[i], indx);
> + 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];
> + sysfs_attr_init(&attr->attrs[i].attr);
> +
> + ret = device_create_file(&tz->device, &attr->attrs[i].attr);
> + if (ret)
> + goto exit_free;
> + }
> + return 0;
> +exit_free:
> + while (--i >= 0)
> + device_remove_file(&tz->device, &attr->attrs[i].attr);
> + return ret;
> +}
> +
> +int add_map_entry(struct thermal_zone *tz, struct thermal_map *map)
> +{
> + int ret, indx;
> +
> + if (!tz || !map)
> + return -EINVAL;
> +
> + mutex_lock(&zone_list_lock);
> +
> + for (indx = 0; indx < MAX_MAPS_PER_ZONE; indx++) {
> + if (tz->map[indx] == NULL)
> + break;
> + }
> +
> + if (indx >= MAX_MAPS_PER_ZONE) {
> + ret = -EINVAL;
> + goto exit;
> + }
> +
> + tz->map_attr[indx] = kzalloc(sizeof(struct thermal_map_attr),
> + GFP_KERNEL);
> + if (!tz->map_attr[indx]) {
> + ret = -ENOMEM;
> + goto exit;
> + }
> +
> + ret = create_map_attrs(tz, indx);
> + if (ret) {
> + kfree(tz->map_attr[indx]);
> + goto exit;
> + }
> +
> + tz->map[indx] = map;
> +exit:
> + mutex_unlock(&zone_list_lock);
> + return ret;
> +}
> +EXPORT_SYMBOL(add_map_entry);
> +
> int add_sensor_to_zone(struct thermal_zone *tz, struct thermal_sensor *ts)
> {
> int ret;
> @@ -2243,8 +2458,10 @@ void thermal_sensor_unregister(struct thermal_sensor *ts)
>
> mutex_lock(&zone_list_lock);
>
> - for_each_thermal_zone(tz)
> + for_each_thermal_zone(tz) {
> remove_sensor_from_zone(tz, ts);
> + remove_sensor_map_entry(tz, ts);
> + }
>
> mutex_unlock(&zone_list_lock);
>
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 2f68018..4389599 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -60,6 +60,11 @@
>
> #define MAX_CDEVS_PER_ZONE 5
>
> +#define NUM_MAP_ATTRS 5
> +
> +/* If we map each sensor with every possible cdev for a zone */
> +#define MAX_MAPS_PER_ZONE (MAX_SENSORS_PER_ZONE * MAX_CDEVS_PER_ZONE)
> +
> struct thermal_sensor;
> struct thermal_zone_device;
> struct thermal_cooling_device;
> @@ -167,6 +172,20 @@ struct thermal_attr {
> char name[THERMAL_NAME_LENGTH];
> };
>
> +struct thermal_map {
> + enum thermal_trip_type trip_type;
> + char cdev_name[THERMAL_NAME_LENGTH];
> + char sensor_name[THERMAL_NAME_LENGTH];
> +
> + int trip_mask;
> + int num_weights;
> + int *weights;
> +};
> +
> +struct thermal_map_attr {
> + struct thermal_attr attrs[NUM_MAP_ATTRS];
> +};
> +
> /*
> * This structure defines the trip points for a sensor.
> * The actual values for these trip points come from
> @@ -256,6 +275,10 @@ struct thermal_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];
> +
> + /* Thermal map information */
> + struct thermal_map *map[MAX_MAPS_PER_ZONE];
> + struct thermal_map_attr *map_attr[MAX_MAPS_PER_ZONE];
> };
>
> /* Structure that holds thermal governor information */
> @@ -341,6 +364,8 @@ 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 *);
>
> +int add_map_entry(struct thermal_zone *, struct thermal_map *);
> +
> #ifdef CONFIG_NET
> extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
> enum events event);
--
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