[PATCH v4 05/14] drm/panfrost: use spinlock instead of atomic

[Clément Péron]

Convert busy_count to a simple int protected by spinlock.

Reviewed-by: Steven Price <steven.pr...@arm.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzw...@collabora.com>
Signed-off-by: Clément Péron <peron.c...@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 43 +++++++++++++++------
 drivers/gpu/drm/panfrost/panfrost_devfreq.h |  9 ++++-
 2 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c 
b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 962550363391..78753cfb59fb 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -12,16 +12,12 @@
 
 static void panfrost_devfreq_update_utilization(struct panfrost_devfreq 
*pfdevfreq)
 {
-       ktime_t now;
-       ktime_t last;
-
-       if (!pfdevfreq->devfreq)
-               return;
+       ktime_t now, last;
 
        now = ktime_get();
        last = pfdevfreq->time_last_update;
 
-       if (atomic_read(&pfdevfreq->busy_count) > 0)
+       if (pfdevfreq->busy_count > 0)
                pfdevfreq->busy_time += ktime_sub(now, last);
        else
                pfdevfreq->idle_time += ktime_sub(now, last);
@@ -59,10 +55,14 @@ static int panfrost_devfreq_get_dev_status(struct device 
*dev,
 {
        struct panfrost_device *pfdev = dev_get_drvdata(dev);
        struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
+       unsigned long irqflags;
+
+       status->current_frequency = clk_get_rate(pfdev->clock);
+
+       spin_lock_irqsave(&pfdevfreq->lock, irqflags);
 
        panfrost_devfreq_update_utilization(pfdevfreq);
 
-       status->current_frequency = clk_get_rate(pfdev->clock);
        status->total_time = ktime_to_ns(ktime_add(pfdevfreq->busy_time,
                                                   pfdevfreq->idle_time));
 
@@ -70,6 +70,8 @@ static int panfrost_devfreq_get_dev_status(struct device *dev,
 
        panfrost_devfreq_reset(pfdevfreq);
 
+       spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
+
        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),
@@ -100,6 +102,8 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
        else if (ret)
                return ret;
 
+       spin_lock_init(&pfdevfreq->lock);
+
        panfrost_devfreq_reset(pfdevfreq);
 
        cur_freq = clk_get_rate(pfdev->clock);
@@ -162,15 +166,32 @@ void panfrost_devfreq_suspend(struct panfrost_device 
*pfdev)
 
 void panfrost_devfreq_record_busy(struct panfrost_devfreq *pfdevfreq)
 {
+       unsigned long irqflags;
+
+       if (!pfdevfreq->devfreq)
+               return;
+
+       spin_lock_irqsave(&pfdevfreq->lock, irqflags);
+
        panfrost_devfreq_update_utilization(pfdevfreq);
-       atomic_inc(&pfdevfreq->busy_count);
+
+       pfdevfreq->busy_count++;
+
+       spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
 }
 
 void panfrost_devfreq_record_idle(struct panfrost_devfreq *pfdevfreq)
 {
-       int count;
+       unsigned long irqflags;
+
+       if (!pfdevfreq->devfreq)
+               return;
+
+       spin_lock_irqsave(&pfdevfreq->lock, irqflags);
 
        panfrost_devfreq_update_utilization(pfdevfreq);
-       count = atomic_dec_if_positive(&pfdevfreq->busy_count);
-       WARN_ON(count < 0);
+
+       WARN_ON(--pfdevfreq->busy_count < 0);
+
+       spin_unlock_irqrestore(&pfdevfreq->lock, irqflags);
 }
diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.h 
b/drivers/gpu/drm/panfrost/panfrost_devfreq.h
index 0697f8d5aa34..3392df1020be 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.h
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.h
@@ -4,6 +4,7 @@
 #ifndef __PANFROST_DEVFREQ_H__
 #define __PANFROST_DEVFREQ_H__
 
+#include <linux/spinlock.h>
 #include <linux/ktime.h>
 
 struct devfreq;
@@ -14,10 +15,16 @@ 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 busy_count;
+       /*
+        * Protect busy_time, idle_time, time_last_update and busy_count
+        * because these can be updated concurrently between multiple jobs.
+        */
+       spinlock_t lock;
 };
 
 int panfrost_devfreq_init(struct panfrost_device *pfdev);
-- 
2.25.1