1 files changed, 108 insertions, 127 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c4feaacf17..2427be8bc9 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -403,7 +403,6 @@ void ttm_bo_put(struct ttm_buffer_object *bo)
 EXPORT_SYMBOL(ttm_bo_put);
 
 static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
-				     struct ttm_resource **mem,
 				     struct ttm_operation_ctx *ctx,
 				     struct ttm_place *hop)
 {
@@ -470,7 +469,7 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
 		if (ret != -EMULTIHOP)
 			break;
 
-		ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem, ctx, &hop);
+		ret = ttm_bo_bounce_temp_buffer(bo, ctx, &hop);
 	} while (!ret);
 
 	if (ret) {
@@ -699,7 +698,6 @@ EXPORT_SYMBOL(ttm_bo_unpin);
  */
 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 				 struct ttm_resource_manager *man,
-				 struct ttm_resource *mem,
 				 bool no_wait_gpu)
 {
 	struct dma_fence *fence;
@@ -725,64 +723,36 @@ static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 	return ret;
 }
 
-/*
- * Repeatedly evict memory from the LRU for @mem_type until we create enough
- * space, or we've evicted everything and there isn't enough space.
- */
-static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
-				  const struct ttm_place *place,
-				  struct ttm_resource **mem,
-				  struct ttm_operation_ctx *ctx)
-{
-	struct ttm_device *bdev = bo->bdev;
-	struct ttm_resource_manager *man;
-	struct ww_acquire_ctx *ticket;
-	int ret;
-
-	man = ttm_manager_type(bdev, place->mem_type);
-	ticket = dma_resv_locking_ctx(bo->base.resv);
-	do {
-		ret = ttm_resource_alloc(bo, place, mem);
-		if (likely(!ret))
-			break;
-		if (unlikely(ret != -ENOSPC))
-			return ret;
-		ret = ttm_mem_evict_first(bdev, man, place, ctx,
-					  ticket);
-		if (unlikely(ret != 0))
-			return ret;
-	} while (1);
-
-	return ttm_bo_add_move_fence(bo, man, *mem, ctx->no_wait_gpu);
-}
-
 /**
- * ttm_bo_mem_space
+ * ttm_bo_alloc_resource - Allocate backing store for a BO
  *
- * @bo: Pointer to a struct ttm_buffer_object. the data of which
- * we want to allocate space for.
- * @placement: Proposed new placement for the buffer object.
- * @mem: A struct ttm_resource.
+ * @bo: Pointer to a struct ttm_buffer_object of which we want a resource for
+ * @placement: Proposed new placement for the buffer object
  * @ctx: if and how to sleep, lock buffers and alloc memory
+ * @force_space: If we should evict buffers to force space
+ * @res: The resulting struct ttm_resource.
  *
- * Allocate memory space for the buffer object pointed to by @bo, using
- * the placement flags in @placement, potentially evicting other idle buffer objects.
- * This function may sleep while waiting for space to become available.
+ * Allocates a resource for the buffer object pointed to by @bo, using the
+ * placement flags in @placement, potentially evicting other buffer objects when
+ * @force_space is true.
+ * This function may sleep while waiting for resources to become available.
  * Returns:
- * -EBUSY: No space available (only if no_wait == 1).
+ * -EBUSY: No space available (only if no_wait == true).
  * -ENOSPC: Could not allocate space for the buffer object, either due to
  * fragmentation or concurrent allocators.
  * -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
  */
-int ttm_bo_mem_space(struct ttm_buffer_object *bo,
-			struct ttm_placement *placement,
-			struct ttm_resource **mem,
-			struct ttm_operation_ctx *ctx)
+static int ttm_bo_alloc_resource(struct ttm_buffer_object *bo,
+				 struct ttm_placement *placement,
+				 struct ttm_operation_ctx *ctx,
+				 bool force_space,
+				 struct ttm_resource **res)
 {
 	struct ttm_device *bdev = bo->bdev;
-	bool type_found = false;
+	struct ww_acquire_ctx *ticket;
 	int i, ret;
 
+	ticket = dma_resv_locking_ctx(bo->base.resv);
 	ret = dma_resv_reserve_fences(bo->base.resv, 1);
 	if (unlikely(ret))
 		return ret;
@@ -791,98 +761,73 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 		const struct ttm_place *place = &placement->placement[i];
 		struct ttm_resource_manager *man;
 
-		if (place->flags & TTM_PL_FLAG_FALLBACK)
-			continue;
-
 		man = ttm_manager_type(bdev, place->mem_type);
 		if (!man || !ttm_resource_manager_used(man))
 			continue;
 
-		type_found = true;
-		ret = ttm_resource_alloc(bo, place, mem);
-		if (ret == -ENOSPC)
+		if (place->flags & (force_space ? TTM_PL_FLAG_DESIRED :
+				    TTM_PL_FLAG_FALLBACK))
+			continue;
+
+		do {
+			ret = ttm_resource_alloc(bo, place, res);
+			if (unlikely(ret && ret != -ENOSPC))
+				return ret;
+			if (likely(!ret) || !force_space)
+				break;
+
+			ret = ttm_mem_evict_first(bdev, man, place, ctx,
+						  ticket);
+			if (unlikely(ret == -EBUSY))
+				break;
+			if (unlikely(ret))
+				return ret;
+		} while (1);
+		if (ret)
 			continue;
-		if (unlikely(ret))
-			goto error;
 
-		ret = ttm_bo_add_move_fence(bo, man, *mem, ctx->no_wait_gpu);
+		ret = ttm_bo_add_move_fence(bo, man, ctx->no_wait_gpu);
 		if (unlikely(ret)) {
-			ttm_resource_free(bo, mem);
+			ttm_resource_free(bo, res);
 			if (ret == -EBUSY)
 				continue;
 
-			goto error;
+			return ret;
 		}
 		return 0;
 	}
 
-	for (i = 0; i < placement->num_placement; ++i) {
-		const struct ttm_place *place = &placement->placement[i];
-		struct ttm_resource_manager *man;
-
-		if (place->flags & TTM_PL_FLAG_DESIRED)
-			continue;
-
-		man = ttm_manager_type(bdev, place->mem_type);
-		if (!man || !ttm_resource_manager_used(man))
-			continue;
-
-		type_found = true;
-		ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
-		if (likely(!ret))
-			return 0;
-
-		if (ret && ret != -EBUSY)
-			goto error;
-	}
-
-	ret = -ENOSPC;
-	if (!type_found) {
-		pr_err(TTM_PFX "No compatible memory type found\n");
-		ret = -EINVAL;
-	}
-
-error:
-	return ret;
+	return -ENOSPC;
 }
-EXPORT_SYMBOL(ttm_bo_mem_space);
 
-static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
-			      struct ttm_placement *placement,
-			      struct ttm_operation_ctx *ctx)
+/*
+ * ttm_bo_mem_space - Wrapper around ttm_bo_alloc_resource
+ *
+ * @bo: Pointer to a struct ttm_buffer_object of which we want a resource for
+ * @placement: Proposed new placement for the buffer object
+ * @res: The resulting struct ttm_resource.
+ * @ctx: if and how to sleep, lock buffers and alloc memory
+ *
+ * Tries both idle allocation and forcefully eviction of buffers. See
+ * ttm_bo_alloc_resource for details.
+ */
+int ttm_bo_mem_space(struct ttm_buffer_object *bo,
+		     struct ttm_placement *placement,
+		     struct ttm_resource **res,
+		     struct ttm_operation_ctx *ctx)
 {
-	struct ttm_resource *mem;
-	struct ttm_place hop;
+	bool force_space = false;
 	int ret;
 
-	dma_resv_assert_held(bo->base.resv);
+	do {
+		ret = ttm_bo_alloc_resource(bo, placement, ctx,
+					    force_space, res);
+		force_space = !force_space;
+	} while (ret == -ENOSPC && force_space);
 
-	/*
-	 * Determine where to move the buffer.
-	 *
-	 * If driver determines move is going to need
-	 * an extra step then it will return -EMULTIHOP
-	 * and the buffer will be moved to the temporary
-	 * stop and the driver will be called to make
-	 * the second hop.
-	 */
-	ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
-	if (ret)
-		return ret;
-bounce:
-	ret = ttm_bo_handle_move_mem(bo, mem, false, ctx, &hop);
-	if (ret == -EMULTIHOP) {
-		ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx, &hop);
-		if (ret)
-			goto out;
-		/* try and move to final place now. */
-		goto bounce;
-	}
-out:
-	if (ret)
-		ttm_resource_free(bo, &mem);
 	return ret;
 }
+EXPORT_SYMBOL(ttm_bo_mem_space);
 
 /**
  * ttm_bo_validate
@@ -903,6 +848,9 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
 		    struct ttm_placement *placement,
 		    struct ttm_operation_ctx *ctx)
 {
+	struct ttm_resource *res;
+	struct ttm_place hop;
+	bool force_space;
 	int ret;
 
 	dma_resv_assert_held(bo->base.resv);
@@ -913,20 +861,53 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
 	if (!placement->num_placement)
 		return ttm_bo_pipeline_gutting(bo);
 
-	/* Check whether we need to move buffer. */
-	if (bo->resource && ttm_resource_compatible(bo->resource, placement))
-		return 0;
+	force_space = false;
+	do {
+		/* Check whether we need to move buffer. */
+		if (bo->resource &&
+		    ttm_resource_compatible(bo->resource, placement,
+					    force_space))
+			return 0;
 
-	/* Moving of pinned BOs is forbidden */
-	if (bo->pin_count)
-		return -EINVAL;
+		/* Moving of pinned BOs is forbidden */
+		if (bo->pin_count)
+			return -EINVAL;
+
+		/*
+		 * Determine where to move the buffer.
+		 *
+		 * If driver determines move is going to need
+		 * an extra step then it will return -EMULTIHOP
+		 * and the buffer will be moved to the temporary
+		 * stop and the driver will be called to make
+		 * the second hop.
+		 */
+		ret = ttm_bo_alloc_resource(bo, placement, ctx, force_space,
+					    &res);
+		force_space = !force_space;
+		if (ret == -ENOSPC)
+			continue;
+		if (ret)
+			return ret;
+
+bounce:
+		ret = ttm_bo_handle_move_mem(bo, res, false, ctx, &hop);
+		if (ret == -EMULTIHOP) {
+			ret = ttm_bo_bounce_temp_buffer(bo, ctx, &hop);
+			/* try and move to final place now. */
+			if (!ret)
+				goto bounce;
+		}
+		if (ret) {
+			ttm_resource_free(bo, &res);
+			return ret;
+		}
+
+	} while (ret && force_space);
 
-	ret = ttm_bo_move_buffer(bo, placement, ctx);
 	/* For backward compatibility with userspace */
 	if (ret == -ENOSPC)
 		return -ENOMEM;
-	if (ret)
-		return ret;
 
 	/*
 	 * We might need to add a TTM.