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Subject[PATCH 5/8] Thermal: Create Thermal map sysfs attributes for a zone
Date
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.

Signed-off-by: Durgadoss R <durgadoss.r@intel.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);
--
1.7.9.5


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