| Message ID | 20210305170338.13647-1-daniel.lezcano@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/4] devfreq: Register devfreq as a cooling device on demand | expand |
Hi, On 21. 3. 6. 오전 2:03, Daniel Lezcano wrote: > Currently the default behavior is to manually having the devfreq > backend to register themselves as a devfreq cooling device. > > Instead of adding the code in the drivers for the thermal cooling > device registering, let's provide a flag in the devfreq's profile to > tell the common devfreq code to register the newly created devfreq as > a cooling device. > > Suggested-by: Chanwoo Choi <cwchoi00@gmail.com> > Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> > --- > drivers/devfreq/devfreq.c | 11 +++++++++++ > include/linux/devfreq.h | 7 +++++++ > 2 files changed, 18 insertions(+) > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index b6d63f02d293..5c0fdd3a48d2 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -11,6 +11,7 @@ > #include <linux/kmod.h> > #include <linux/sched.h> > #include <linux/debugfs.h> > +#include <linux/devfreq_cooling.h> > #include <linux/errno.h> > #include <linux/err.h> > #include <linux/init.h> > @@ -26,6 +27,7 @@ > #include <linux/hrtimer.h> > #include <linux/of.h> > #include <linux/pm_qos.h> > +#include <linux/thermal.h> > #include <linux/units.h> Acutally, current devfreq-next branch doesn't contain previous your patch about units clean-up. So that when I applied it to next branch, merge conflict happen because of '<linux/units.h>'. Just send the patches again regardless of 'devfreq: Use HZ macros'. > #include "governor.h" > > @@ -935,6 +937,13 @@ struct devfreq *devfreq_add_device(struct device *dev, > > mutex_unlock(&devfreq_list_lock); > > + if (devfreq->profile->is_cooling_device) { > + devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL); > + if (IS_ERR(devfreq->cdev)) > + dev_info(dev, "Failed to register devfreq " > + "cooling device\n"); Have to initialize devfreq->cdev by NULL when error happen. Because of just returning from thermal_cooling_device_unregister when cdev is not used. > + } > + > return devfreq; > > err_init: > @@ -960,6 +969,8 @@ int devfreq_remove_device(struct devfreq *devfreq) > if (!devfreq) > return -EINVAL; > > + thermal_cooling_device_unregister(devfreq->cdev); > + > if (devfreq->governor) { > devfreq->governor->event_handler(devfreq, > DEVFREQ_GOV_STOP, NULL); > diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h > index 26ea0850be9b..554e7904b0c5 100644 > --- a/include/linux/devfreq.h > +++ b/include/linux/devfreq.h > @@ -98,11 +98,15 @@ struct devfreq_dev_status { > * @freq_table: Optional list of frequencies to support statistics > * and freq_table must be generated in ascending order. > * @max_state: The size of freq_table. > + * > + * @is_cooling_device: A self-explanatory boolean giving the device a > + * cooling effect property. > */ > struct devfreq_dev_profile { > unsigned long initial_freq; > unsigned int polling_ms; > enum devfreq_timer timer; > + bool is_cooling_device; > > int (*target)(struct device *dev, unsigned long *freq, u32 flags); > int (*get_dev_status)(struct device *dev, > @@ -198,6 +202,9 @@ struct devfreq { > > struct srcu_notifier_head transition_notifier_list; > > + /* Pointer to the cooling device if used for thermal mitigation */ > + struct thermal_cooling_device *cdev; > + You need to the description of cdev instance to 'struct devfreq'. > struct notifier_block nb_min; > struct notifier_block nb_max; > }; > -- Best Regards, Samsung Electronics Chanwoo Choi
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index b6d63f02d293..5c0fdd3a48d2 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -11,6 +11,7 @@ #include <linux/kmod.h> #include <linux/sched.h> #include <linux/debugfs.h> +#include <linux/devfreq_cooling.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/init.h> @@ -26,6 +27,7 @@ #include <linux/hrtimer.h> #include <linux/of.h> #include <linux/pm_qos.h> +#include <linux/thermal.h> #include <linux/units.h> #include "governor.h" @@ -935,6 +937,13 @@ struct devfreq *devfreq_add_device(struct device *dev, mutex_unlock(&devfreq_list_lock); + if (devfreq->profile->is_cooling_device) { + devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL); + if (IS_ERR(devfreq->cdev)) + dev_info(dev, "Failed to register devfreq " + "cooling device\n"); + } + return devfreq; err_init: @@ -960,6 +969,8 @@ int devfreq_remove_device(struct devfreq *devfreq) if (!devfreq) return -EINVAL; + thermal_cooling_device_unregister(devfreq->cdev); + if (devfreq->governor) { devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_STOP, NULL); diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 26ea0850be9b..554e7904b0c5 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -98,11 +98,15 @@ struct devfreq_dev_status { * @freq_table: Optional list of frequencies to support statistics * and freq_table must be generated in ascending order. * @max_state: The size of freq_table. + * + * @is_cooling_device: A self-explanatory boolean giving the device a + * cooling effect property. */ struct devfreq_dev_profile { unsigned long initial_freq; unsigned int polling_ms; enum devfreq_timer timer; + bool is_cooling_device; int (*target)(struct device *dev, unsigned long *freq, u32 flags); int (*get_dev_status)(struct device *dev, @@ -198,6 +202,9 @@ struct devfreq { struct srcu_notifier_head transition_notifier_list; + /* Pointer to the cooling device if used for thermal mitigation */ + struct thermal_cooling_device *cdev; + struct notifier_block nb_min; struct notifier_block nb_max; };
Currently the default behavior is to manually having the devfreq backend to register themselves as a devfreq cooling device. Instead of adding the code in the drivers for the thermal cooling device registering, let's provide a flag in the devfreq's profile to tell the common devfreq code to register the newly created devfreq as a cooling device. Suggested-by: Chanwoo Choi <cwchoi00@gmail.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> --- drivers/devfreq/devfreq.c | 11 +++++++++++ include/linux/devfreq.h | 7 +++++++ 2 files changed, 18 insertions(+) -- 2.17.1