Revert "drm/ttm: add a way to bo_wait for either the last read or last write"

This reverts commit dfadbbdb57b3f2bb33e14f129a43047c6f0caefa.

Further upstream discussion between Marek and Thomas decided this wasn't
fully baked and needed further work, so revert it before it hits mainline.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 26 insertions, 71 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 50fc8e4c9a31..617b64678fc6 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -499,7 +499,7 @@ static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 	int ret;
 
 	spin_lock(&bdev->fence_lock);
-	(void) ttm_bo_wait(bo, false, false, true, TTM_USAGE_READWRITE);
+	(void) ttm_bo_wait(bo, false, false, true);
 	if (!bo->sync_obj) {
 
 		spin_lock(&glob->lru_lock);
@@ -567,8 +567,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 
 retry:
 	spin_lock(&bdev->fence_lock);
-	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
-			  TTM_USAGE_READWRITE);
+	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 	spin_unlock(&bdev->fence_lock);
 
 	if (unlikely(ret != 0))
@@ -727,8 +726,7 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 	int ret = 0;
 
 	spin_lock(&bdev->fence_lock);
-	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
-			  TTM_USAGE_READWRITE);
+	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 	spin_unlock(&bdev->fence_lock);
 
 	if (unlikely(ret != 0)) {
@@ -1075,8 +1073,7 @@ int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 	 * instead of doing it here.
 	 */
 	spin_lock(&bdev->fence_lock);
-	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
-			  TTM_USAGE_READWRITE);
+	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 	spin_unlock(&bdev->fence_lock);
 	if (ret)
 		return ret;
@@ -1697,83 +1694,34 @@ out_unlock:
 	return ret;
 }
 
-static void ttm_bo_unref_sync_obj_locked(struct ttm_buffer_object *bo,
-					 void *sync_obj,
-					 void **extra_sync_obj)
-{
-	struct ttm_bo_device *bdev = bo->bdev;
-	struct ttm_bo_driver *driver = bdev->driver;
-	void *tmp_obj = NULL, *tmp_obj_read = NULL, *tmp_obj_write = NULL;
-
-	/* We must unref the sync obj wherever it's ref'd.
-	 * Note that if we unref bo->sync_obj, we can unref both the read
-	 * and write sync objs too, because they can't be newer than
-	 * bo->sync_obj, so they are no longer relevant. */
-	if (sync_obj == bo->sync_obj ||
-	    sync_obj == bo->sync_obj_read) {
-		tmp_obj_read = bo->sync_obj_read;
-		bo->sync_obj_read = NULL;
-	}
-	if (sync_obj == bo->sync_obj ||
-	    sync_obj == bo->sync_obj_write) {
-		tmp_obj_write = bo->sync_obj_write;
-		bo->sync_obj_write = NULL;
-	}
-	if (sync_obj == bo->sync_obj) {
-		tmp_obj = bo->sync_obj;
-		bo->sync_obj = NULL;
-	}
-
-	clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
-	spin_unlock(&bdev->fence_lock);
-	if (tmp_obj)
-		driver->sync_obj_unref(&tmp_obj);
-	if (tmp_obj_read)
-		driver->sync_obj_unref(&tmp_obj_read);
-	if (tmp_obj_write)
-		driver->sync_obj_unref(&tmp_obj_write);
-	if (extra_sync_obj)
-		driver->sync_obj_unref(extra_sync_obj);
-	spin_lock(&bdev->fence_lock);
-}
-
 int ttm_bo_wait(struct ttm_buffer_object *bo,
-		bool lazy, bool interruptible, bool no_wait,
-		enum ttm_buffer_usage usage)
+		bool lazy, bool interruptible, bool no_wait)
 {
 	struct ttm_bo_driver *driver = bo->bdev->driver;
 	struct ttm_bo_device *bdev = bo->bdev;
 	void *sync_obj;
 	void *sync_obj_arg;
 	int ret = 0;
-	void **bo_sync_obj;
 
-	switch (usage) {
-	case TTM_USAGE_READ:
-		bo_sync_obj = &bo->sync_obj_read;
-		break;
-	case TTM_USAGE_WRITE:
-		bo_sync_obj = &bo->sync_obj_write;
-		break;
-	case TTM_USAGE_READWRITE:
-	default:
-		bo_sync_obj = &bo->sync_obj;
-	}
-
-	if (likely(*bo_sync_obj == NULL))
+	if (likely(bo->sync_obj == NULL))
 		return 0;
 
-	while (*bo_sync_obj) {
+	while (bo->sync_obj) {
 
-		if (driver->sync_obj_signaled(*bo_sync_obj, bo->sync_obj_arg)) {
-			ttm_bo_unref_sync_obj_locked(bo, *bo_sync_obj, NULL);
+		if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
+			void *tmp_obj = bo->sync_obj;
+			bo->sync_obj = NULL;
+			clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
+			spin_unlock(&bdev->fence_lock);
+			driver->sync_obj_unref(&tmp_obj);
+			spin_lock(&bdev->fence_lock);
 			continue;
 		}
 
 		if (no_wait)
 			return -EBUSY;
 
-		sync_obj = driver->sync_obj_ref(*bo_sync_obj);
+		sync_obj = driver->sync_obj_ref(bo->sync_obj);
 		sync_obj_arg = bo->sync_obj_arg;
 		spin_unlock(&bdev->fence_lock);
 		ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
@@ -1784,9 +1732,16 @@ int ttm_bo_wait(struct ttm_buffer_object *bo,
 			return ret;
 		}
 		spin_lock(&bdev->fence_lock);
-		if (likely(*bo_sync_obj == sync_obj &&
+		if (likely(bo->sync_obj == sync_obj &&
 			   bo->sync_obj_arg == sync_obj_arg)) {
-			ttm_bo_unref_sync_obj_locked(bo, *bo_sync_obj, &sync_obj);
+			void *tmp_obj = bo->sync_obj;
+			bo->sync_obj = NULL;
+			clear_bit(TTM_BO_PRIV_FLAG_MOVING,
+				  &bo->priv_flags);
+			spin_unlock(&bdev->fence_lock);
+			driver->sync_obj_unref(&sync_obj);
+			driver->sync_obj_unref(&tmp_obj);
+			spin_lock(&bdev->fence_lock);
 		} else {
 			spin_unlock(&bdev->fence_lock);
 			driver->sync_obj_unref(&sync_obj);
@@ -1810,7 +1765,7 @@ int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
 	if (unlikely(ret != 0))
 		return ret;
 	spin_lock(&bdev->fence_lock);
-	ret = ttm_bo_wait(bo, false, true, no_wait, TTM_USAGE_READWRITE);
+	ret = ttm_bo_wait(bo, false, true, no_wait);
 	spin_unlock(&bdev->fence_lock);
 	if (likely(ret == 0))
 		atomic_inc(&bo->cpu_writers);
@@ -1884,7 +1839,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
 	 */
 
 	spin_lock(&bo->bdev->fence_lock);
-	ret = ttm_bo_wait(bo, false, false, false, TTM_USAGE_READWRITE);
+	ret = ttm_bo_wait(bo, false, false, false);
 	spin_unlock(&bo->bdev->fence_lock);
 
 	if (unlikely(ret != 0))