linux-kernel - [PATCH v2 08/22] drm/msm/gem: Switch over to obj->resv for locking

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Date:   Sun, 11 Oct 2020 19:09:35 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 08/22] drm/msm/gem: Switch over to obj->resv for locking

From: Rob Clark <robdclark@...omium.org>

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c        |  4 +---
 drivers/gpu/drm/msm/msm_gem.h        | 16 +++++-----------
 drivers/gpu/drm/msm/msm_gem_submit.c |  4 ++--
 drivers/gpu/drm/msm/msm_gpu.c        |  2 +-
 4 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index ff8ca257bdc6..210bf5c9c2dd 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -955,9 +955,9 @@ static void free_object(struct msm_gem_object *msm_obj)
 		put_pages(obj);
 	}
 
+	msm_gem_unlock(obj);
 	drm_gem_object_release(obj);
 
-	msm_gem_unlock(obj);
 	kfree(msm_obj);
 }
 
@@ -1029,8 +1029,6 @@ static int msm_gem_new_impl(struct drm_device *dev,
 	if (!msm_obj)
 		return -ENOMEM;
 
-	mutex_init(&msm_obj->lock);
-
 	msm_obj->flags = flags;
 	msm_obj->madv = MSM_MADV_WILLNEED;
 
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 744889436a98..ec01f35ce57b 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -85,7 +85,6 @@ struct msm_gem_object {
 	 * an IOMMU.  Also used for stolen/splashscreen buffer.
 	 */
 	struct drm_mm_node *vram_node;
-	struct mutex lock; /* Protects resources associated with bo */
 
 	char name[32]; /* Identifier to print for the debugfs files */
 
@@ -156,36 +155,31 @@ void msm_gem_describe_objects(struct list_head *list, struct seq_file *m);
 static inline void
 msm_gem_lock(struct drm_gem_object *obj)
 {
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	mutex_lock(&msm_obj->lock);
+	dma_resv_lock(obj->resv, NULL);
 }
 
 static inline bool __must_check
 msm_gem_trylock(struct drm_gem_object *obj)
 {
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	return mutex_trylock_recursive(&msm_obj->lock) == MUTEX_TRYLOCK_SUCCESS;
+	return dma_resv_trylock(obj->resv);
 }
 
 static inline int
 msm_gem_lock_interruptible(struct drm_gem_object *obj)
 {
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	return mutex_lock_interruptible(&msm_obj->lock);
+	return dma_resv_lock_interruptible(obj->resv, NULL);
 }
 
 static inline void
 msm_gem_unlock(struct drm_gem_object *obj)
 {
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	mutex_unlock(&msm_obj->lock);
+	dma_resv_unlock(obj->resv);
 }
 
 static inline bool
 msm_gem_is_locked(struct drm_gem_object *obj)
 {
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	return mutex_is_locked(&msm_obj->lock);
+	return dma_resv_is_locked(obj->resv);
 }
 
 static inline bool is_active(struct msm_gem_object *msm_obj)
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index a9422d043bfe..35b7d9d06850 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -215,7 +215,7 @@ static void submit_unlock_unpin_bo(struct msm_gem_submit *submit,
 	struct msm_gem_object *msm_obj = submit->bos[i].obj;
 
 	if (submit->bos[i].flags & BO_PINNED)
-		msm_gem_unpin_iova(&msm_obj->base, submit->aspace);
+		msm_gem_unpin_iova_locked(&msm_obj->base, submit->aspace);
 
 	if (submit->bos[i].flags & BO_LOCKED)
 		dma_resv_unlock(msm_obj->base.resv);
@@ -318,7 +318,7 @@ static int submit_pin_objects(struct msm_gem_submit *submit)
 		uint64_t iova;
 
 		/* if locking succeeded, pin bo: */
-		ret = msm_gem_get_and_pin_iova(&msm_obj->base,
+		ret = msm_gem_get_and_pin_iova_locked(&msm_obj->base,
 				submit->aspace, &iova);
 
 		if (ret)
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 55d16489d0f3..dbd9020713e5 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -784,7 +784,7 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 
 		/* submit takes a reference to the bo and iova until retired: */
 		drm_gem_object_get(&msm_obj->base);
-		msm_gem_get_and_pin_iova(&msm_obj->base, submit->aspace, &iova);
+		msm_gem_get_and_pin_iova_locked(&msm_obj->base, submit->aspace, &iova);
 
 		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
 			dma_resv_add_excl_fence(drm_obj->resv, submit->fence);
-- 
2.26.2