drm/panfrost: introduce panfrost_devfreq struct

Introduce a proper panfrost_devfreq to deal with devfreq variables.
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200710095409.407087-5-peron.clem@gmail.com

drivers/gpu/drm/panfrost/panfrost_devfreq.c

@@ -10,23 +10,23 @@
 #include "panfrost_device.h"
 #include "panfrost_devfreq.h"
 
-static void panfrost_devfreq_update_utilization(struct panfrost_device *pfdev)
+static void panfrost_devfreq_update_utilization(struct panfrost_devfreq *pfdevfreq)
 {
 	ktime_t now;
 	ktime_t last;
 
-	if (!pfdev->devfreq.devfreq)
+	if (!pfdevfreq->devfreq)
 		return;
 
 	now = ktime_get();
-	last = pfdev->devfreq.time_last_update;
+	last = pfdevfreq->time_last_update;
 
-	if (atomic_read(&pfdev->devfreq.busy_count) > 0)
-		pfdev->devfreq.busy_time += ktime_sub(now, last);
+	if (atomic_read(&pfdevfreq->busy_count) > 0)
+		pfdevfreq->busy_time += ktime_sub(now, last);
 	else
-		pfdev->devfreq.idle_time += ktime_sub(now, last);
+		pfdevfreq->idle_time += ktime_sub(now, last);
 
-	pfdev->devfreq.time_last_update = now;
+	pfdevfreq->time_last_update = now;
 }
 
 static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
@@ -47,30 +47,31 @@ static int panfrost_devfreq_target(struct device *dev, unsigned long *freq,
 	return 0;
 }
 
-static void panfrost_devfreq_reset(struct panfrost_device *pfdev)
+static void panfrost_devfreq_reset(struct panfrost_devfreq *pfdevfreq)
 {
-	pfdev->devfreq.busy_time = 0;
-	pfdev->devfreq.idle_time = 0;
-	pfdev->devfreq.time_last_update = ktime_get();
+	pfdevfreq->busy_time = 0;
+	pfdevfreq->idle_time = 0;
+	pfdevfreq->time_last_update = ktime_get();
 }
 
 static int panfrost_devfreq_get_dev_status(struct device *dev,
 					   struct devfreq_dev_status *status)
 {
 	struct panfrost_device *pfdev = dev_get_drvdata(dev);
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
 
-	panfrost_devfreq_update_utilization(pfdev);
+	panfrost_devfreq_update_utilization(pfdevfreq);
 
 	status->current_frequency = clk_get_rate(pfdev->clock);
-	status->total_time = ktime_to_ns(ktime_add(pfdev->devfreq.busy_time,
-						   pfdev->devfreq.idle_time));
+	status->total_time = ktime_to_ns(ktime_add(pfdevfreq->busy_time,
+						   pfdevfreq->idle_time));
 
-	status->busy_time = ktime_to_ns(pfdev->devfreq.busy_time);
+	status->busy_time = ktime_to_ns(pfdevfreq->busy_time);
 
-	panfrost_devfreq_reset(pfdev);
+	panfrost_devfreq_reset(pfdevfreq);
 
-	dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n", status->busy_time,
-		status->total_time,
+	dev_dbg(pfdev->dev, "busy %lu total %lu %lu %% freq %lu MHz\n",
+		status->busy_time, status->total_time,
 		status->busy_time / (status->total_time / 100),
 		status->current_frequency / 1000 / 1000);
 
@@ -91,6 +92,7 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	struct device *dev = &pfdev->pdev->dev;
 	struct devfreq *devfreq;
 	struct thermal_cooling_device *cooling;
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
 
 	ret = dev_pm_opp_of_add_table(dev);
 	if (ret == -ENODEV) /* Optional, continue without devfreq */
@@ -98,7 +100,7 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	else if (ret)
 		return ret;
 
-	panfrost_devfreq_reset(pfdev);
+	panfrost_devfreq_reset(pfdevfreq);
 
 	cur_freq = clk_get_rate(pfdev->clock);
 
@@ -116,53 +118,59 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 		dev_pm_opp_of_remove_table(dev);
 		return PTR_ERR(devfreq);
 	}
-	pfdev->devfreq.devfreq = devfreq;
+	pfdevfreq->devfreq = devfreq;
 
 	cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
 	if (IS_ERR(cooling))
 		DRM_DEV_INFO(dev, "Failed to register cooling device\n");
 	else
-		pfdev->devfreq.cooling = cooling;
+		pfdevfreq->cooling = cooling;
 
 	return 0;
 }
 
 void panfrost_devfreq_fini(struct panfrost_device *pfdev)
 {
-	if (pfdev->devfreq.cooling)
-		devfreq_cooling_unregister(pfdev->devfreq.cooling);
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	if (pfdevfreq->cooling)
+		devfreq_cooling_unregister(pfdevfreq->cooling);
 	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
 }
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev)
 {
-	if (!pfdev->devfreq.devfreq)
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	if (!pfdevfreq->devfreq)
 		return;
 
-	panfrost_devfreq_reset(pfdev);
+	panfrost_devfreq_reset(pfdevfreq);
 
-	devfreq_resume_device(pfdev->devfreq.devfreq);
+	devfreq_resume_device(pfdevfreq->devfreq);
 }
 
 void panfrost_devfreq_suspend(struct panfrost_device *pfdev)
 {
-	if (!pfdev->devfreq.devfreq)
+	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+
+	if (!pfdevfreq->devfreq)
 		return;
 
-	devfreq_suspend_device(pfdev->devfreq.devfreq);
+	devfreq_suspend_device(pfdevfreq->devfreq);
 }
 
-void panfrost_devfreq_record_busy(struct panfrost_device *pfdev)
+void panfrost_devfreq_record_busy(struct panfrost_devfreq *pfdevfreq)
 {
-	panfrost_devfreq_update_utilization(pfdev);
-	atomic_inc(&pfdev->devfreq.busy_count);
+	panfrost_devfreq_update_utilization(pfdevfreq);
+	atomic_inc(&pfdevfreq->busy_count);
 }
 
-void panfrost_devfreq_record_idle(struct panfrost_device *pfdev)
+void panfrost_devfreq_record_idle(struct panfrost_devfreq *pfdevfreq)
 {
 	int count;
 
-	panfrost_devfreq_update_utilization(pfdev);
-	count = atomic_dec_if_positive(&pfdev->devfreq.busy_count);
+	panfrost_devfreq_update_utilization(pfdevfreq);
+	count = atomic_dec_if_positive(&pfdevfreq->busy_count);
 	WARN_ON(count < 0);
 }

drivers/gpu/drm/panfrost/panfrost_devfreq.h

@@ -4,13 +4,29 @@
 #ifndef __PANFROST_DEVFREQ_H__
 #define __PANFROST_DEVFREQ_H__
 
+#include <linux/ktime.h>
+
+struct devfreq;
+struct thermal_cooling_device;
+
+struct panfrost_device;
+
+struct panfrost_devfreq {
+	struct devfreq *devfreq;
+	struct thermal_cooling_device *cooling;
+	ktime_t busy_time;
+	ktime_t idle_time;
+	ktime_t time_last_update;
+	atomic_t busy_count;
+};
+
 int panfrost_devfreq_init(struct panfrost_device *pfdev);
 void panfrost_devfreq_fini(struct panfrost_device *pfdev);
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev);
 void panfrost_devfreq_suspend(struct panfrost_device *pfdev);
 
-void panfrost_devfreq_record_busy(struct panfrost_device *pfdev);
-void panfrost_devfreq_record_idle(struct panfrost_device *pfdev);
+void panfrost_devfreq_record_busy(struct panfrost_devfreq *devfreq);
+void panfrost_devfreq_record_idle(struct panfrost_devfreq *devfreq);
 
 #endif /* __PANFROST_DEVFREQ_H__ */

drivers/gpu/drm/panfrost/panfrost_device.h

@@ -13,6 +13,8 @@
 #include <drm/drm_mm.h>
 #include <drm/gpu_scheduler.h>
 
+#include "panfrost_devfreq.h"
+
 struct panfrost_device;
 struct panfrost_mmu;
 struct panfrost_job_slot;
@@ -107,14 +109,7 @@ struct panfrost_device {
 	struct list_head shrinker_list;
 	struct shrinker shrinker;
 
-	struct {
-		struct devfreq *devfreq;
-		struct thermal_cooling_device *cooling;
-		ktime_t busy_time;
-		ktime_t idle_time;
-		ktime_t time_last_update;
-		atomic_t busy_count;
-	} devfreq;
+	struct panfrost_devfreq pfdevfreq;
 };
 
 struct panfrost_mmu {

drivers/gpu/drm/panfrost/panfrost_job.c

@@ -145,7 +145,7 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
 	u64 jc_head = job->jc;
 	int ret;
 
-	panfrost_devfreq_record_busy(pfdev);
+	panfrost_devfreq_record_busy(&pfdev->pfdevfreq);
 
 	ret = pm_runtime_get_sync(pfdev->dev);
 	if (ret < 0)
@@ -410,7 +410,7 @@ static void panfrost_job_timedout(struct drm_sched_job *sched_job)
 	for (i = 0; i < NUM_JOB_SLOTS; i++) {
 		if (pfdev->jobs[i]) {
 			pm_runtime_put_noidle(pfdev->dev);
-			panfrost_devfreq_record_idle(pfdev);
+			panfrost_devfreq_record_idle(&pfdev->pfdevfreq);
 			pfdev->jobs[i] = NULL;
 		}
 	}
@@ -478,7 +478,7 @@ static irqreturn_t panfrost_job_irq_handler(int irq, void *data)
 				pfdev->jobs[j] = NULL;
 
 				panfrost_mmu_as_put(pfdev, &job->file_priv->mmu);
-				panfrost_devfreq_record_idle(pfdev);
+				panfrost_devfreq_record_idle(&pfdev->pfdevfreq);
 
 				dma_fence_signal_locked(job->done_fence);
 				pm_runtime_put_autosuspend(pfdev->dev);