Hi rui,
> -----Original Message-----
> From: Zhang, Rui
> Sent: Tuesday, October 15, 2013 3:53 PM
> To: R, Durgadoss
> Cc: [email protected]; [email protected]; linux-
> [email protected]; [email protected]; [email protected]
> Subject: Re: [PATCHv4 3/9] Thermal: Create zone level APIs
>
> On Wed, 2013-10-02 at 00:08 +0530, Durgadoss R wrote:
> > This patch adds a new thermal_zone structure to
> > thermal.h. Also, adds zone level APIs to the thermal
> > framework.
> >
> > A thermal zone is a hot spot on the platform, which
> > can have one or more sensors and cooling devices attached
> > to it. These sensors can be mapped to a set of cooling
> > devices, which when throttled, can help to bring down
> > the temperature of the hot spot.
> >
> > Signed-off-by: Durgadoss R <[email protected]>
> > ---
> > drivers/thermal/thermal_core.c | 267
> +++++++++++++++++++++++++++++++++++++++-
> > include/linux/thermal.h | 23 ++++
> > 2 files changed, 289 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> > index 8c46567..a053b60 100644
> > --- a/drivers/thermal/thermal_core.c
> > +++ b/drivers/thermal/thermal_core.c
> > @@ -44,19 +44,48 @@ MODULE_DESCRIPTION("Generic thermal management
> sysfs support");
> > MODULE_LICENSE("GPL v2");
> >
> > static DEFINE_IDR(thermal_tz_idr);
> > +static DEFINE_IDR(thermal_zone_idr);
> > static DEFINE_IDR(thermal_cdev_idr);
> > static DEFINE_IDR(thermal_sensor_idr);
> > static DEFINE_MUTEX(thermal_idr_lock);
> >
> > static LIST_HEAD(thermal_tz_list);
> > static LIST_HEAD(thermal_sensor_list);
> > +static LIST_HEAD(thermal_zone_list);
> > static LIST_HEAD(thermal_cdev_list);
> > static LIST_HEAD(thermal_governor_list);
> >
> > static DEFINE_MUTEX(thermal_list_lock);
> > static DEFINE_MUTEX(sensor_list_lock);
> > +static DEFINE_MUTEX(zone_list_lock);
> > static DEFINE_MUTEX(thermal_governor_lock);
> >
> > +#define for_each_thermal_sensor(pos) \
> > + list_for_each_entry(pos, &thermal_sensor_list, node)
> > +
> > +#define for_each_thermal_zone(pos) \
> > + list_for_each_entry(pos, &thermal_zone_list, node)
> > +
> > +#define GET_INDEX(tz, ptr, type) \
> > +({ \
> > + int i, ret = -EINVAL; \
> > + do { \
> > + if (!tz || !ptr) \
> > + break; \
> > + mutex_lock(&tz->lock); \
> > + mutex_lock(&type##_list_lock); \
> > + for (i = 0; i < tz->type##_indx; i++) { \
> > + if (tz->type##s[i] == ptr) { \
> > + ret = i; \
> > + break; \
> > + } \
> > + } \
> > + mutex_unlock(&type##_list_lock); \
> > + mutex_unlock(&tz->lock); \
> > + } while (0); \
> > + ret; \
> > +})
> > +
> > static struct thermal_governor *__find_governor(const char *name)
> > {
> > struct thermal_governor *pos;
> > @@ -461,15 +490,47 @@ static void thermal_zone_device_check(struct
> work_struct *work)
> > thermal_zone_device_update(tz);
> > }
> >
> > +static void remove_sensor_from_zone(struct thermal_zone *tz,
> > + struct thermal_sensor *ts)
> > +{
> > + int j, indx;
> > +
> > + indx = GET_INDEX(tz, ts, sensor);
> > + if (indx < 0)
> > + return;
> > +
> > + sysfs_remove_link(&tz->device.kobj, kobject_name(&ts->device.kobj));
> > +
> > + mutex_lock(&tz->lock);
> > +
> > + /* Shift the entries in the tz->sensors array */
> > + for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++)
> > + tz->sensors[j] = tz->sensors[j + 1];
> > +
> > + tz->sensor_indx--;
> > + mutex_unlock(&tz->lock);
> > +}
> > +
> > /* sys I/F for thermal zone */
> >
> > #define to_thermal_zone(_dev) \
> > container_of(_dev, struct thermal_zone_device, device)
> >
> > +#define to_zone(_dev) \
> > + container_of(_dev, struct thermal_zone, device)
> > +
> > #define to_thermal_sensor(_dev) \
> > container_of(_dev, struct thermal_sensor, device)
> >
> > static ssize_t
> > +zone_name_show(struct device *dev, struct device_attribute *attr, char
> *buf)
> > +{
> > + struct thermal_zone *tz = to_zone(dev);
> > +
> > + return sprintf(buf, "%s\n", tz->name);
> > +}
> > +
> > +static ssize_t
> > sensor_name_show(struct device *dev, struct device_attribute *attr, char
> *buf)
> > {
> > struct thermal_sensor *ts = to_thermal_sensor(dev);
> > @@ -876,6 +937,8 @@ 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);
> > +
> > /* sys I/F for cooling device */
> > #define to_cooling_device(_dev) \
> > container_of(_dev, struct thermal_cooling_device, device)
> > @@ -1689,7 +1752,7 @@ static void remove_trip_attrs(struct
> thermal_zone_device *tz)
> > kfree(tz->trip_hyst_attrs);
> > }
> >
> > - /**
> > +/**
> > * enable_sensor_thresholds - create sysfs nodes for thresholdX
> > * @ts: the thermal sensor
> > * @count: Number of thresholds supported by sensor hardware
> > @@ -1746,6 +1809,200 @@ static int enable_sensor_thresholds(struct
> thermal_sensor *ts, int count)
> > }
> >
> > /**
> > + * create_thermal_zone - create sysfs nodes for thermal zone
> > + * @name: Name of the thermla zone
> > + * @devdata: Data supplied by the caller
> > + *
> > + * On Success returns a thermal zone reference, otherwise:
> > + * -EINVAL for invalid parameters,
> > + * -ENOMEM for insufficient memory cases,
> > + */
> > +struct thermal_zone *create_thermal_zone(const char *name, void
> *devdata)
> > +{
> > + struct thermal_zone *tz;
> > + int ret;
> > +
> > + if (!name || (name && strlen(name) >= THERMAL_NAME_LENGTH))
> > + return ERR_PTR(-EINVAL);
> > +
> > + tz = kzalloc(sizeof(*tz), GFP_KERNEL);
> > + if (!tz)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + idr_init(&tz->idr);
> > + ret = get_idr(&thermal_zone_idr, &thermal_idr_lock, &tz->id);
> > + if (ret)
> > + goto exit_free;
> > +
> > + mutex_init(&tz->lock);
> > + strlcpy(tz->name, name, sizeof(tz->name));
> > + tz->devdata = devdata;
> > + tz->device.class = &thermal_class;
> > +
> > + dev_set_name(&tz->device, "zone%d", tz->id);
> > + ret = device_register(&tz->device);
> > + if (ret)
> > + goto exit_idr;
> > +
> > + ret = device_create_file(&tz->device, &dev_attr_zone_name);
> > + if (ret)
> > + goto exit_unregister;
> > +
> > + /* 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_unregister:
> > + device_unregister(&tz->device);
> > +exit_idr:
> > + mutex_destroy(&tz->lock);
> > + release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id);
> > +exit_free:
> > + kfree(tz);
> > + return ERR_PTR(ret);
> > +}
> > +EXPORT_SYMBOL(create_thermal_zone);
> > +
> as this is a thermal subsystem API, I'd prefer to use the names starting
> with thermal_xxx.
So, can we name thermal_create_thermal_zone ?
And we will do similar thing for all EXPORT_SYMBOL APIs.
>
> > +/**
> > + * remove_thermal_zone - removes the sysfs nodes for given tz
> > + * @tz: Thermal zone to be removed.
> > + */
> > +void remove_thermal_zone(struct thermal_zone *tz)
> > +{
> > + struct thermal_zone *pos, *next;
> > + struct thermal_sensor *ts;
> > + bool found = false;
> > +
> > + if (!tz)
> > + return;
> > +
> > + mutex_lock(&zone_list_lock);
> > +
> > + list_for_each_entry_safe(pos, next, &thermal_zone_list, node) {
> > + if (pos == tz) {
> > + list_del(&tz->node);
> > + found = true;
> > + break;
> > + }
> > + }
> > +
> > + if (!found)
> > + goto exit;
> > +
> > + for_each_thermal_sensor(ts)
> > + remove_sensor_from_zone(tz, ts);
> > +
> > + device_remove_file(&tz->device, &dev_attr_zone_name);
> > +
> > + mutex_destroy(&tz->lock);
> > + release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id);
> > + idr_destroy(&tz->idr);
> > +
> > + device_unregister(&tz->device);
> > + kfree(tz);
> > +exit:
> > + mutex_unlock(&zone_list_lock);
> > + return;
> > +}
> > +EXPORT_SYMBOL(remove_thermal_zone);
> > +
> ditto
>
> > +/**
> > + * get_sensor_by_name() - search for a sensor and returns its reference
> > + * @name: thermal sensor name to fetch the reference
> > + *
> > + * On success returns a reference to a unique sensor with
> > + * name matching that of @name, an ERR_PTR otherwise:
> > + * -EINVAL for invalid paramenters
> > + * -ENODEV for sensor not found
> > + * -EEXIST for multiple matches
> > + */
> > +struct thermal_sensor *get_sensor_by_name(const char *name)
> > +{
> > + int found = 0;
> > + struct thermal_sensor *pos;
> > + struct thermal_sensor *ts = ERR_PTR(-EINVAL);
> > +
> > + if (!name)
> > + return ts;
> > +
> > + mutex_lock(&sensor_list_lock);
> > + for_each_thermal_sensor(pos) {
> > + if (!strnicmp(pos->name, name, THERMAL_NAME_LENGTH)) {
> > + found++;
> > + ts = pos;
> > + }
> > + }
> > + mutex_unlock(&sensor_list_lock);
> > +
> > + if (found == 0)
> > + ts = ERR_PTR(-ENODEV);
> > + else if (found > 1)
> > + ts = ERR_PTR(-EEXIST);
> > +
> > + return ts;
> > +}
> > +EXPORT_SYMBOL(get_sensor_by_name);
> > +
> ditto
>
> > +/**
> > + * add_sensor_to_zone - Add @ts to thermal zone @tz
> > + * @tz: Thermal zone reference
> > + * @ts: Thermal sensor reference
> > + *
> > + * Returns 0 on success, otherwise
> > + * -EINVAL for invalid paramenters
> > + * -EINVAL when trying to add more zones than MAX_SENSORS_PER_ZONE
> > + * -EEXIST when trying add existing thermal sensor again
> > + */
> > +int add_sensor_to_zone(struct thermal_zone *tz, struct thermal_sensor *ts)
> > +{
> > + int ret;
> > +
> > + if (!tz || !ts)
> > + return -EINVAL;
> > +
> > + mutex_lock(&zone_list_lock);
> > +
> > + /* Ensure we are not adding the same sensor again!! */
> > + ret = GET_INDEX(tz, ts, sensor);
> > + if (ret >= 0) {
> > + ret = -EEXIST;
> > + goto exit_zone;
> > + }
> > +
> > + /* Protect against 'ts' being unregistered */
> > + mutex_lock(&sensor_list_lock);
> > +
> > + ret = sysfs_create_link(&tz->device.kobj, &ts->device.kobj,
> > + kobject_name(&ts->device.kobj));
> > + if (ret)
> > + goto exit_sensor;
> > +
> > + mutex_lock(&tz->lock);
> > +
> > + if (tz->sensor_indx >= MAX_SENSORS_PER_ZONE - 1) {
> > + dev_err(&tz->device, "Only %d sensors allowed per zone\n",
> > + MAX_SENSORS_PER_ZONE);
> > + sysfs_remove_link(&tz->device.kobj,
> > + kobject_name(&ts->device.kobj));
> > + ret = -EINVAL;
> > + goto exit_indx_check;
> > + }
> > +
> > + tz->sensors[tz->sensor_indx++] = ts;
> > +
> > +exit_indx_check:
> > + mutex_unlock(&tz->lock);
> > +exit_sensor:
> > + mutex_unlock(&sensor_list_lock);
> > +exit_zone:
> > + mutex_unlock(&zone_list_lock);
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(add_sensor_to_zone);
> > +
> ditto
>
> > +/**
> > * thermal_sensor_register - register a new thermal sensor
> > * @name: name of the thermal sensor
> > * @count: Number of thresholds supported by hardware
> > @@ -1829,6 +2086,7 @@ EXPORT_SYMBOL(thermal_sensor_register);
> > void thermal_sensor_unregister(struct thermal_sensor *ts)
> > {
> > int i;
> > + struct thermal_zone *tz;
> > struct thermal_sensor *pos, *next;
> > bool found = false;
> >
> > @@ -1848,6 +2106,13 @@ void thermal_sensor_unregister(struct
> thermal_sensor *ts)
> > if (!found)
> > return;
> >
> > + mutex_lock(&zone_list_lock);
> > +
> > + for_each_thermal_zone(tz)
> > + remove_sensor_from_zone(tz, ts);
> > +
> > + mutex_unlock(&zone_list_lock);
> > +
> I do not see the code to bind the sensors to zone in this patch, and I
> guess we support manually binding only, via explicitly calling () in
> platform thermal driver, at the moment, right?
Yes, you are right.
Thanks,
Durga
>
> thanks,
> rui
> > for (i = 0; i < ts->thresholds; i++) {
> > device_remove_file(&ts->device, &ts->thresh_attrs[i].attr);
> > if (ts->ops->get_hyst) {
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index 25fc562..2e12321 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -58,6 +58,8 @@
> > #define DEFAULT_THERMAL_GOVERNOR "user_space"
> > #endif
> >
> > +#define MAX_SENSORS_PER_ZONE 5
> > +
> > struct thermal_sensor;
> > struct thermal_zone_device;
> > struct thermal_cooling_device;
> > @@ -207,6 +209,22 @@ struct thermal_zone_device {
> > struct delayed_work poll_queue;
> > };
> >
> > +struct thermal_zone {
> > + char name[THERMAL_NAME_LENGTH];
> > + int id;
> > + void *devdata;
> > + struct thermal_zone *ops;
> > + struct thermal_governor *governor;
> > + struct idr idr;
> > + struct mutex lock; /* protect elements of this structure */
> > + struct device device;
> > + struct list_head node;
> > +
> > + /* Sensor level information */
> > + int sensor_indx; /* index into 'sensors' array */
> > + struct thermal_sensor *sensors[MAX_SENSORS_PER_ZONE];
> > +};
> > +
> > /* Structure that holds thermal governor information */
> > struct thermal_governor {
> > char name[THERMAL_NAME_LENGTH];
> > @@ -277,6 +295,11 @@ struct thermal_sensor *thermal_sensor_register(const
> char *, int,
> > struct thermal_sensor_ops *, void *);
> > void thermal_sensor_unregister(struct thermal_sensor *);
> >
> > +struct thermal_zone *create_thermal_zone(const char *, void *);
> > +void remove_thermal_zone(struct thermal_zone *);
> > +int add_sensor_to_zone(struct thermal_zone *, struct thermal_sensor *);
> > +struct thermal_sensor *get_sensor_by_name(const char *);
> > +
> > #ifdef CONFIG_NET
> > extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
> > enum events event);
>
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