linux-kernel - [PATCH v3 1/4] devfreq: Register devfreq as a cooling device on demand

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Date:   Sun,  7 Mar 2021 10:45:15 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     cwchoi00@...il.com
Cc:     lukasz.luba@....com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, steven.price@....com,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCH v3 1/4] devfreq: Register devfreq as a cooling device on demand

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@...il.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 V3:
   - Rebased on linux-pm branch without units.h
   - Set the cdev to NULL in case of error
   - Added description for the cdev field in the devfreq structure
 V2:
   - Added is_cooling_device boolean in profile structure
   - Register cooling device when the is_cooling_device boolean is set
   - Remove devfreq cooling device registration in the backend drivers
 V1:
   - Register devfreq as a cooling device unconditionnally
---
 drivers/devfreq/devfreq.c | 13 +++++++++++++
 include/linux/devfreq.h   |  8 ++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index bf3047896e41..cf64aeec468f 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 "governor.h"
 
 #define CREATE_TRACE_POINTS
@@ -935,6 +937,15 @@ 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");
+			devfreq->cdev = NULL;
+		}
+	}
+
 	return devfreq;
 
 err_init:
@@ -960,6 +971,8 @@ 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..aba7ace11b72 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,
@@ -156,6 +160,7 @@ struct devfreq_stats {
  * @suspend_count:	 suspend requests counter for a device.
  * @stats:	Statistics of devfreq device behavior
  * @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
+ * @cdev:	Cooling device pointer if the devfreq has cooling property
  * @nb_min:		Notifier block for DEV_PM_QOS_MIN_FREQUENCY
  * @nb_max:		Notifier block for DEV_PM_QOS_MAX_FREQUENCY
  *
@@ -198,6 +203,9 @@ 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;
 };
-- 
2.17.1