From e7b7c111614e420ee5269b39787e203e6b07e9c7 Mon Sep 17 00:00:00 2001
From: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Date: Wed, 10 Apr 2019 11:11:43 +0200
Subject: [PATCH] SQUASH: add lock around resets
---
drivers/gpu/drm/panfrost/panfrost_device.c | 1 +
drivers/gpu/drm/panfrost/panfrost_device.h | 1 +
drivers/gpu/drm/panfrost/panfrost_job.c | 4 ++++
3 files changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 91e8fb0f2b25b..970f669c6d293 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -98,6 +98,7 @@ int panfrost_device_init(struct panfrost_device *pfdev)
struct resource *res;
mutex_init(&pfdev->sched_lock);
+ mutex_init(&pfdev->reset_lock);
INIT_LIST_HEAD(&pfdev->scheduled_jobs);
spin_lock_init(&pfdev->hwaccess_lock);
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 1ba48d105763d..56f452dfb4900 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -78,6 +78,7 @@ struct panfrost_device {
struct list_head scheduled_jobs;
struct mutex sched_lock;
+ struct mutex reset_lock;
struct {
struct devfreq *devfreq;
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 6d1eb0ce76e92..ffdaba180245d 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -384,6 +384,8 @@ static void panfrost_job_timedout(struct drm_sched_job *sched_job)
job_read(pfdev, JS_TAIL_LO(js)),
sched_job);
+ mutex_lock(&pfdev->reset_lock);
+
for (i = 0; i < NUM_JOB_SLOTS; i++)
drm_sched_stop(&pfdev->js->queue[i].sched);
@@ -406,6 +408,8 @@ static void panfrost_job_timedout(struct drm_sched_job *sched_job)
/* restart scheduler after GPU is usable again */
for (i = 0; i < NUM_JOB_SLOTS; i++)
drm_sched_start(&pfdev->js->queue[i].sched, true);
+
+ mutex_unlock(&pfdev->reset_lock);
}
static const struct drm_sched_backend_ops panfrost_sched_ops = {
--
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