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thermal: devfreq_cooling: add new registration functions with Energy Model

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The Energy Model (EM) framework supports devices such as Devfreq. Create
new registration function which automatically register EM for the thermal
devfreq_cooling devices. This patch prepares the code for coming changes
which are going to replace old power model with the new EM.

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201210143014.24685-4-lukasz.luba@arm.com
This commit is contained in:
Lukasz Luba 2020-12-10 14:30:12 +00:00 committed by Daniel Lezcano
parent 229794eee2
commit 84e0d87c99
2 changed files with 63 additions and 1 deletions
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54
drivers/thermal/devfreq_cooling.c
View File

@ -12,6 +12,7 @@
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
#include <linux/energy_model.h>
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/slab.h>
@ -576,22 +577,73 @@ struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df)
}
EXPORT_SYMBOL_GPL(devfreq_cooling_register);
/**
* devfreq_cooling_em_register_power() - Register devfreq cooling device with
* power information and automatically register Energy Model (EM)
* @df: Pointer to devfreq device.
* @dfc_power: Pointer to devfreq_cooling_power.
*
* Register a devfreq cooling device and automatically register EM. The
* available OPPs must be registered for the device.
*
* If @dfc_power is provided, the cooling device is registered with the
* power extensions. It is using the simple Energy Model which requires
* "dynamic-power-coefficient" a devicetree property. To not break drivers
* which miss that DT property, the function won't bail out when the EM
* registration failed. The cooling device will be registered if everything
* else is OK.
*/
struct thermal_cooling_device *
devfreq_cooling_em_register(struct devfreq *df,
struct devfreq_cooling_power *dfc_power)
{
struct thermal_cooling_device *cdev;
struct device *dev;
int ret;
if (IS_ERR_OR_NULL(df))
return ERR_PTR(-EINVAL);
dev = df->dev.parent;
ret = dev_pm_opp_of_register_em(dev, NULL);
if (ret)
dev_dbg(dev, "Unable to register EM for devfreq cooling device (%d)\n",
ret);
cdev = of_devfreq_cooling_register_power(dev->of_node, df, dfc_power);
if (IS_ERR_OR_NULL(cdev))
em_dev_unregister_perf_domain(dev);
return cdev;
}
EXPORT_SYMBOL_GPL(devfreq_cooling_em_register);
/**
* devfreq_cooling_unregister() - Unregister devfreq cooling device.
* @cdev: Pointer to devfreq cooling device to unregister.
*
* Unregisters devfreq cooling device and related Energy Model if it was
* present.
*/
void devfreq_cooling_unregister(struct thermal_cooling_device *cdev)
{
struct devfreq_cooling_device *dfc;
struct device *dev;
if (!cdev)
if (IS_ERR_OR_NULL(cdev))
return;
dfc = cdev->devdata;
dev = dfc->devfreq->dev.parent;
thermal_cooling_device_unregister(dfc->cdev);
ida_simple_remove(&devfreq_ida, dfc->id);
dev_pm_qos_remove_request(&dfc->req_max_freq);
em_dev_unregister_perf_domain(dev);
kfree(dfc->power_table);
kfree(dfc->freq_table);

10
include/linux/devfreq_cooling.h
View File

@ -65,6 +65,9 @@ struct thermal_cooling_device *
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
struct thermal_cooling_device *
devfreq_cooling_em_register(struct devfreq *df,
struct devfreq_cooling_power *dfc_power);
#else /* !CONFIG_DEVFREQ_THERMAL */
@ -87,6 +90,13 @@ devfreq_cooling_register(struct devfreq *df)
return ERR_PTR(-EINVAL);
}
static inline struct thermal_cooling_device *
devfreq_cooling_em_register(struct devfreq *df,
struct devfreq_cooling_power *dfc_power)
{
return ERR_PTR(-EINVAL);
}
static inline void
devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
{