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Date: Mon, 21 Sep 2020 13:20:05 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Cc: rui.zhang@...el.com, amit.kucheria@...durent.com,
daniel.lezcano@...aro.org, lukasz.luba@....com, orjan.eide@....com,
robh@...nel.org, alyssa.rosenzweig@...labora.com,
steven.price@....com, airlied@...ux.ie, daniel@...ll.ch
Subject: [PATCH 3/5] thermal: devfreq_cooling: add new registration functions with Energy Model
The Energy Model (EM) framework supports devices such as Devfreq. Create
new registration functions 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.
Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
drivers/thermal/devfreq_cooling.c | 99 ++++++++++++++++++++++++++++++-
include/linux/devfreq_cooling.h | 22 +++++++
2 files changed, 120 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c
index cf045bd4d16b..7e091e795284 100644
--- a/drivers/thermal/devfreq_cooling.c
+++ b/drivers/thermal/devfreq_cooling.c
@@ -50,6 +50,8 @@ static DEFINE_IDA(devfreq_ida);
* @capped_state: index to cooling state with in dynamic power budget
* @req_max_freq: PM QoS request for limiting the maximum frequency
* of the devfreq device.
+ * @em: Energy Model which represents the associated Devfreq device
+ * @em_registered: Devfreq cooling registered the EM and should free it.
*/
struct devfreq_cooling_device {
int id;
@@ -63,6 +65,8 @@ struct devfreq_cooling_device {
u32 res_util;
int capped_state;
struct dev_pm_qos_request req_max_freq;
+ struct em_perf_domain *em;
+ bool em_registered;
};
static int devfreq_cooling_get_max_state(struct thermal_cooling_device *cdev,
@@ -586,22 +590,115 @@ 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 attempt to register Energy Model (EM)
+ * @df: Pointer to devfreq device.
+ * @dfc_power: Pointer to devfreq_cooling_power.
+ * @em_cb: Callback functions providing the data of the EM
+ *
+ * Register a devfreq cooling device and attempt to register Energy Model. The
+ * available OPPs must be registered for the device.
+ *
+ * If @dfc_power is provided, the cooling device is registered with the
+ * power extensions. If @em_cb is provided it will be called for each OPP to
+ * calculate power value and cost. If @em_cb is not provided then simple Energy
+ * Model is going to be used, which requires "dynamic-power-coefficient" a
+ * devicetree property.
+ */
+struct thermal_cooling_device *
+devfreq_cooling_em_register_power(struct devfreq *df,
+ struct devfreq_cooling_power *dfc_power,
+ struct em_data_callback *em_cb)
+{
+ struct thermal_cooling_device *cdev;
+ struct devfreq_cooling_device *dfc;
+ struct device_node *np = NULL;
+ struct device *dev;
+ int nr_opp, ret;
+
+ if (IS_ERR_OR_NULL(df))
+ return ERR_PTR(-EINVAL);
+
+ dev = df->dev.parent;
+
+ if (em_cb) {
+ nr_opp = dev_pm_opp_get_opp_count(dev);
+ if (nr_opp <= 0) {
+ dev_err(dev, "No valid OPPs found\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ ret = em_dev_register_perf_domain(dev, nr_opp, em_cb, NULL);
+ } else {
+ ret = dev_pm_opp_of_register_em(dev, NULL);
+ }
+
+ if (ret)
+ dev_warn(dev, "Unable to register EM for devfreq cooling device (%d)\n",
+ ret);
+
+ if (dev->of_node)
+ np = of_node_get(dev->of_node);
+
+ cdev = of_devfreq_cooling_register_power(np, df, dfc_power);
+
+ if (np)
+ of_node_put(np);
+
+ if (IS_ERR_OR_NULL(cdev)) {
+ if (!ret)
+ em_dev_unregister_perf_domain(dev);
+ } else {
+ dfc = cdev->devdata;
+ dfc->em_registered = !ret;
+ }
+
+ return cdev;
+}
+EXPORT_SYMBOL_GPL(devfreq_cooling_em_register_power);
+
+/**
+ * devfreq_cooling_em_register() - Register devfreq cooling device together
+ * with Energy Model.
+ * @df: Pointer to devfreq device.
+ * @em_cb: Callback functions providing the data of the Energy Model
+ *
+ * This function attempts to register Energy Model for devfreq device and then
+ * register the devfreq cooling device.
+ */
+struct thermal_cooling_device *
+devfreq_cooling_em_register(struct devfreq *df, struct em_data_callback *em_cb)
+{
+ return devfreq_cooling_em_register_power(df, NULL, em_cb);
+}
+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);
+
+ if (dfc->em_registered)
+ em_dev_unregister_perf_domain(dev);
+
kfree(dfc->power_table);
kfree(dfc->freq_table);
diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h
index 9df2dfca68dd..19868fb922f1 100644
--- a/include/linux/devfreq_cooling.h
+++ b/include/linux/devfreq_cooling.h
@@ -11,6 +11,7 @@
#define __DEVFREQ_COOLING_H__
#include <linux/devfreq.h>
+#include <linux/energy_model.h>
#include <linux/thermal.h>
@@ -65,6 +66,13 @@ 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_power(struct devfreq *df,
+ struct devfreq_cooling_power *dfc_power,
+ struct em_data_callback *em_cb);
+struct thermal_cooling_device *
+devfreq_cooling_em_register(struct devfreq *df,
+ struct em_data_callback *em_cb);
#else /* !CONFIG_DEVFREQ_THERMAL */
@@ -87,6 +95,20 @@ devfreq_cooling_register(struct devfreq *df)
return ERR_PTR(-EINVAL);
}
+static inline struct thermal_cooling_device *
+devfreq_cooling_em_register_power(struct devfreq *df,
+ struct devfreq_cooling_power *dfc_power,
+ struct em_data_callback *em_cb)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline struct thermal_cooling_device *
+devfreq_cooling_em_register(struct devfreq *df, struct em_data_callback *em_cb)
+{
+ return ERR_PTR(-EINVAL);
+}
+
static inline void
devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
{
--
2.17.1
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