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Date: Fri, 1 Mar 2013 15:33:13 +0000
From: "R, Durgadoss" <durgadoss.r@...el.com>
To: Eduardo Valentin <eduardo.valentin@...com>
CC: "Zhang, Rui" <rui.zhang@...el.com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"hongbo.zhang@...aro.org" <hongbo.zhang@...aro.org>,
"wni@...dia.com" <wni@...dia.com>
Subject: RE: [PATCH 3/8] Thermal: Add APIs to bind cdev to new zone structure
> -----Original Message-----
> From: Eduardo Valentin [mailto:eduardo.valentin@...com]
> Sent: Friday, March 01, 2013 1:06 AM
> To: R, Durgadoss
> Cc: Zhang, Rui; linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> hongbo.zhang@...aro.org; wni@...dia.com
> Subject: Re: [PATCH 3/8] Thermal: Add APIs to bind cdev to new zone
> structure
>
> Durga,
>
> On 05-02-2013 06:46, 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.
>
> Same comments on patch 02/08 I want to rise here:
>
> - Consider using linked list
> - You may have contention on your index/cdevs array
> - overflow on your buffer (carefully check your implementation)
> - zone removal condition. can we remove zones with cdevs registered?
Yes, as I said in 02/08.
> - get_by_name, why do we need it? (at least not on this patch)
The platform drivers need this API to query the pointer for cdevs,
sensors.
Thanks,
Durga
> - Minors on strlcpy, snprintf, devm_ helpers
> - documentation in the code for these helper functions and also better
> naming..
>
> >
> > Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
> > ---
> > drivers/thermal/thermal_sys.c | 80
> +++++++++++++++++++++++++++++++++++++++++
> > include/linux/thermal.h | 9 +++++
> > 2 files changed, 89 insertions(+)
> >
> > diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> > index 838d4fb..bf703b1 100644
> > --- a/drivers/thermal/thermal_sys.c
> > +++ b/drivers/thermal/thermal_sys.c
> > @@ -57,6 +57,7 @@ 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) \
> > @@ -83,6 +84,9 @@ 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;
> > @@ -466,6 +470,24 @@ static void remove_sensor_from_zone(struct
> thermal_zone *tz,
> > tz->sensor_indx--;
> > }
> >
> > +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));
> > +
> > + /* 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--;
> > +}
> > +
> > /* sys I/F for thermal zone */
> >
> > #define to_thermal_zone(_dev) \
> > @@ -1462,6 +1484,7 @@ 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)
> > @@ -1499,6 +1522,13 @@ 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);
> > @@ -1794,6 +1824,23 @@ exit:
> > }
> > EXPORT_SYMBOL(remove_thermal_zone);
> >
> > +struct thermal_cooling_device *get_cdev_by_name(const char *name)
> > +{
> > + struct thermal_cooling_device *pos;
> > + struct thermal_cooling_device *cdev = NULL;
> > +
> > + mutex_lock(&cdev_list_lock);
> > + for_each_cdev(pos) {
> > + if (!strnicmp(pos->type, name, THERMAL_NAME_LENGTH)) {
> > + cdev = pos;
> > + break;
> > + }
> > + }
> > + mutex_unlock(&cdev_list_lock);
> > + return cdev;
> > +}
> > +EXPORT_SYMBOL(get_cdev_by_name);
> > +
> > struct thermal_sensor *get_sensor_by_name(const char *name)
> > {
> > struct thermal_sensor *pos;
> > @@ -1844,6 +1891,39 @@ exit_zone:
> > }
> > EXPORT_SYMBOL(add_sensor_to_zone);
> >
> > +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;
> > + }
> > +
> > + 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;
> > +
> > + tz->cdevs[tz->cdev_indx++] = cdev;
> > +
> > +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
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index 2194519..c841414 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -57,6 +57,8 @@
> >
> > #define MAX_SENSORS_PER_ZONE 5
> >
> > +#define MAX_CDEVS_PER_ZONE 5
> > +
> > struct thermal_sensor;
> > struct thermal_zone_device;
> > struct thermal_cooling_device;
> > @@ -217,6 +219,10 @@ 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 */
> > @@ -296,6 +302,9 @@ 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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