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Date: Tue, 15 Oct 2013 18:27:50 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: Durgadoss R <durgadoss.r@...el.com>
Cc: eduardo.valentin@...com, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, hongbo.zhang@...escale.com,
wni@...dia.com
Subject: Re: [PATCHv4 4/9] Thermal: Add APIs to bind cdev to new zone
structure
On Wed, 2013-10-02 at 00:08 +0530, Durgadoss R wrote:
> This patch creates new APIs to add/remove a
> cdev to/from a zone. This patch does not change
> the old cooling device implementation.
>
> Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
I'm okay with this patch except the API naming.
thanks,
rui
> ---
> drivers/thermal/thermal_core.c | 136 ++++++++++++++++++++++++++++++++++++++++
> include/linux/thermal.h | 9 +++
> 2 files changed, 145 insertions(+)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index a053b60..3c4ef62 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -58,6 +58,7 @@ 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(cdev_list_lock);
> static DEFINE_MUTEX(thermal_governor_lock);
>
> #define for_each_thermal_sensor(pos) \
> @@ -86,6 +87,9 @@ static DEFINE_MUTEX(thermal_governor_lock);
> ret; \
> })
>
> +#define for_each_cdev(pos) \
> + list_for_each_entry(pos, &thermal_cdev_list, node)
> +
> static struct thermal_governor *__find_governor(const char *name)
> {
> struct thermal_governor *pos;
> @@ -511,6 +515,27 @@ static void remove_sensor_from_zone(struct thermal_zone *tz,
> mutex_unlock(&tz->lock);
> }
>
> +static void remove_cdev_from_zone(struct thermal_zone *tz,
> + struct thermal_cooling_device *cdev)
> +{
> + int j, indx;
> +
> + indx = GET_INDEX(tz, cdev, cdev);
> + if (indx < 0)
> + return;
> +
> + sysfs_remove_link(&tz->device.kobj, kobject_name(&cdev->device.kobj));
> +
> + mutex_lock(&tz->lock);
> +
> + /* Shift the entries in the tz->cdevs array */
> + for (j = indx; j < MAX_CDEVS_PER_ZONE - 1; j++)
> + tz->cdevs[j] = tz->cdevs[j + 1];
> +
> + tz->cdev_indx--;
> + mutex_unlock(&tz->lock);
> +}
> +
> /* sys I/F for thermal zone */
>
> #define to_thermal_zone(_dev) \
> @@ -1555,6 +1580,7 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
> int i;
> const struct thermal_zone_params *tzp;
> struct thermal_zone_device *tz;
> + struct thermal_zone *tmp_tz;
> struct thermal_cooling_device *pos = NULL;
>
> if (!cdev)
> @@ -1592,6 +1618,13 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
>
> mutex_unlock(&thermal_list_lock);
>
> + mutex_lock(&zone_list_lock);
> +
> + for_each_thermal_zone(tmp_tz)
> + remove_cdev_from_zone(tmp_tz, cdev);
> +
> + mutex_unlock(&zone_list_lock);
> +
> if (cdev->type[0])
> device_remove_file(&cdev->device, &dev_attr_cdev_type);
> device_remove_file(&cdev->device, &dev_attr_max_state);
> @@ -1873,6 +1906,7 @@ void remove_thermal_zone(struct thermal_zone *tz)
> {
> struct thermal_zone *pos, *next;
> struct thermal_sensor *ts;
> + struct thermal_cooling_device *cdev;
> bool found = false;
>
> if (!tz)
> @@ -1894,6 +1928,9 @@ void remove_thermal_zone(struct thermal_zone *tz)
> for_each_thermal_sensor(ts)
> remove_sensor_from_zone(tz, ts);
>
> + for_each_cdev(cdev)
> + remove_cdev_from_zone(tz, cdev);
> +
> device_remove_file(&tz->device, &dev_attr_zone_name);
>
> mutex_destroy(&tz->lock);
> @@ -1909,6 +1946,47 @@ exit:
> EXPORT_SYMBOL(remove_thermal_zone);
>
> /**
> + * get_cdev_by_name() - search for a cdev and returns its reference
> + * @name: cooling device name to fetch the reference
> + *
> + * On success returns a reference to an unique cdev with
> + * the name matching that of @name, an ERR_PTR otherwise:
> + * -EINVAL for invalid paramenters
> + * -ENODEV for cdev not found
> + * -EEXIST for multiple matches
> + */
> +struct thermal_cooling_device *get_cdev_by_name(const char *name)
> +{
> + int found = 0;
> + struct thermal_cooling_device *pos;
> + struct thermal_cooling_device *cdev = ERR_PTR(-EINVAL);
> +
> + if (!name)
> + return cdev;
> +
> + mutex_lock(&cdev_list_lock);
> + for_each_cdev(pos) {
> + if (!strnicmp(pos->type, name, THERMAL_NAME_LENGTH)) {
> + found++;
> + cdev = pos;
> + }
> + }
> + mutex_unlock(&cdev_list_lock);
> +
> + /*
> + * Nothing has been found; return an error code for it.
> + * Return success only when an unique cdev is found.
> + */
> + if (found == 0)
> + cdev = ERR_PTR(-ENODEV);
> + else if (found > 1)
> + cdev = ERR_PTR(-EEXIST);
> +
> + return cdev;
> +}
> +EXPORT_SYMBOL(get_cdev_by_name);
> +
> +/**
> * get_sensor_by_name() - search for a sensor and returns its reference
> * @name: thermal sensor name to fetch the reference
> *
> @@ -2003,6 +2081,64 @@ exit_zone:
> EXPORT_SYMBOL(add_sensor_to_zone);
>
> /**
> + * add_cdev_to_zone - Add @cdev to thermal zone @tz
> + * @tz: Thermal zone reference
> + * @cdev: Cooling device reference
> + *
> + * Returns 0 on success, otherwise
> + * -EINVAL for invalid paramenters
> + * -EINVAL when trying to add more cdevs than MAX_CDEVS_PER_ZONE
> + * -EEXIST when trying add existing cdev again
> + */
> +int add_cdev_to_zone(struct thermal_zone *tz,
> + struct thermal_cooling_device *cdev)
> +{
> + int ret;
> +
> + if (!tz || !cdev)
> + return -EINVAL;
> +
> + mutex_lock(&zone_list_lock);
> +
> + /* Ensure we are not adding the same cdev again!! */
> + ret = GET_INDEX(tz, cdev, cdev);
> + if (ret >= 0) {
> + ret = -EEXIST;
> + goto exit_zone;
> + }
> +
> + /* Protect against 'cdev' being unregistered */
> + mutex_lock(&cdev_list_lock);
> +
> + ret = sysfs_create_link(&tz->device.kobj, &cdev->device.kobj,
> + kobject_name(&cdev->device.kobj));
> + if (ret)
> + goto exit_cdev;
> +
> + mutex_lock(&tz->lock);
> +
> + if (tz->cdev_indx >= MAX_CDEVS_PER_ZONE - 1) {
> + dev_err(&tz->device, "Only %d cdevs allowed per zone\n",
> + MAX_CDEVS_PER_ZONE);
> + sysfs_remove_link(&tz->device.kobj,
> + kobject_name(&cdev->device.kobj));
> + ret = -EINVAL;
> + goto exit_indx_check;
> + }
> +
> + tz->cdevs[tz->cdev_indx++] = cdev;
> +
> +exit_indx_check:
> + mutex_unlock(&tz->lock);
> +exit_cdev:
> + mutex_unlock(&cdev_list_lock);
> +exit_zone:
> + mutex_unlock(&zone_list_lock);
> + return ret;
> +}
> +EXPORT_SYMBOL(add_cdev_to_zone);
> +
> +/**
> * thermal_sensor_register - register a new thermal sensor
> * @name: name of the thermal sensor
> * @count: Number of thresholds supported by hardware
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 2e12321..da7520c 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -60,6 +60,8 @@
>
> #define MAX_SENSORS_PER_ZONE 5
>
> +#define MAX_CDEVS_PER_ZONE 5
> +
> struct thermal_sensor;
> struct thermal_zone_device;
> struct thermal_cooling_device;
> @@ -223,6 +225,10 @@ struct thermal_zone {
> /* Sensor level information */
> int sensor_indx; /* index into 'sensors' array */
> struct thermal_sensor *sensors[MAX_SENSORS_PER_ZONE];
> +
> + /* cdev level information */
> + int cdev_indx; /* index into 'cdevs' array */
> + struct thermal_cooling_device *cdevs[MAX_CDEVS_PER_ZONE];
> };
>
> /* Structure that holds thermal governor information */
> @@ -300,6 +306,9 @@ 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 *);
>
> +int add_cdev_to_zone(struct thermal_zone *, struct thermal_cooling_device *);
> +struct thermal_cooling_device *get_cdev_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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