drm/amdgpu/ttm: use multihop

This removes the code to move resources directly between
SYSTEM and VRAM in favour of using the core ttm mulithop code.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201109005432.861936-3-airlied@gmail.com

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -512,119 +512,6 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
 	return r;
 }
 
-/**
- * amdgpu_move_vram_ram - Copy VRAM buffer to RAM buffer
- *
- * Called by amdgpu_bo_move().
- */
-static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
-				struct ttm_operation_ctx *ctx,
-				struct ttm_resource *new_mem)
-{
-	struct ttm_resource *old_mem = &bo->mem;
-	struct ttm_resource tmp_mem;
-	struct ttm_place placements;
-	struct ttm_placement placement;
-	int r;
-
-	/* create space/pages for new_mem in GTT space */
-	tmp_mem = *new_mem;
-	tmp_mem.mm_node = NULL;
-	placement.num_placement = 1;
-	placement.placement = &placements;
-	placement.num_busy_placement = 1;
-	placement.busy_placement = &placements;
-	placements.fpfn = 0;
-	placements.lpfn = 0;
-	placements.mem_type = TTM_PL_TT;
-	placements.flags = 0;
-	r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
-	if (unlikely(r)) {
-		pr_err("Failed to find GTT space for blit from VRAM\n");
-		return r;
-	}
-
-	r = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
-	if (unlikely(r))
-		goto out_cleanup;
-
-	/* Bind the memory to the GTT space */
-	r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, &tmp_mem);
-	if (unlikely(r)) {
-		goto out_cleanup;
-	}
-
-	/* blit VRAM to GTT */
-	r = amdgpu_move_blit(bo, evict, &tmp_mem, old_mem);
-	if (unlikely(r)) {
-		goto out_cleanup;
-	}
-
-	r = ttm_bo_wait_ctx(bo, ctx);
-	if (unlikely(r))
-		goto out_cleanup;
-
-	amdgpu_ttm_backend_unbind(bo->bdev, bo->ttm);
-	ttm_resource_free(bo, &bo->mem);
-	ttm_bo_assign_mem(bo, new_mem);
-out_cleanup:
-	ttm_resource_free(bo, &tmp_mem);
-	return r;
-}
-
-/**
- * amdgpu_move_ram_vram - Copy buffer from RAM to VRAM
- *
- * Called by amdgpu_bo_move().
- */
-static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
-				struct ttm_operation_ctx *ctx,
-				struct ttm_resource *new_mem)
-{
-	struct ttm_resource *old_mem = &bo->mem;
-	struct ttm_resource tmp_mem;
-	struct ttm_placement placement;
-	struct ttm_place placements;
-	int r;
-
-	/* make space in GTT for old_mem buffer */
-	tmp_mem = *new_mem;
-	tmp_mem.mm_node = NULL;
-	placement.num_placement = 1;
-	placement.placement = &placements;
-	placement.num_busy_placement = 1;
-	placement.busy_placement = &placements;
-	placements.fpfn = 0;
-	placements.lpfn = 0;
-	placements.mem_type = TTM_PL_TT;
-	placements.flags = 0;
-	r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
-	if (unlikely(r)) {
-		pr_err("Failed to find GTT space for blit to VRAM\n");
-		return r;
-	}
-
-	/* move/bind old memory to GTT space */
-	r = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
-	if (unlikely(r))
-		return r;
-
-	r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, &tmp_mem);
-	if (unlikely(r)) {
-		goto out_cleanup;
-	}
-
-	ttm_bo_assign_mem(bo, &tmp_mem);
-	/* copy to VRAM */
-	r = amdgpu_move_blit(bo, evict, new_mem, old_mem);
-	if (unlikely(r)) {
-		goto out_cleanup;
-	}
-out_cleanup:
-	ttm_resource_free(bo, &tmp_mem);
-	return r;
-}
-
 /**
  * amdgpu_mem_visible - Check that memory can be accessed by ttm_bo_move_memcpy
  *
@@ -664,6 +551,17 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 	struct ttm_resource *old_mem = &bo->mem;
 	int r;
 
+	if ((old_mem->mem_type == TTM_PL_SYSTEM &&
+	     new_mem->mem_type == TTM_PL_VRAM) ||
+	    (old_mem->mem_type == TTM_PL_VRAM &&
+	     new_mem->mem_type == TTM_PL_SYSTEM)) {
+		hop->fpfn = 0;
+		hop->lpfn = 0;
+		hop->mem_type = TTM_PL_TT;
+		hop->flags = 0;
+		return -EMULTIHOP;
+	}
+
 	if (new_mem->mem_type == TTM_PL_TT) {
 		r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, new_mem);
 		if (r)
@@ -717,17 +615,7 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 		goto memcpy;
 	}
 
-	if (old_mem->mem_type == TTM_PL_VRAM &&
-	    new_mem->mem_type == TTM_PL_SYSTEM) {
-		r = amdgpu_move_vram_ram(bo, evict, ctx, new_mem);
-	} else if (old_mem->mem_type == TTM_PL_SYSTEM &&
-		   new_mem->mem_type == TTM_PL_VRAM) {
-		r = amdgpu_move_ram_vram(bo, evict, ctx, new_mem);
-	} else {
-		r = amdgpu_move_blit(bo, evict,
-				     new_mem, old_mem);
-	}
-
+	r = amdgpu_move_blit(bo, evict, new_mem, old_mem);
 	if (r) {
 memcpy:
 		/* Check that all memory is CPU accessible */