drm/ttm: add move to system into drivers

This moves the to system move into the drivers, and moves all
the unbinds in the move path under driver control

Note: radeon/nouveau already wait so don't duplicate it.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201020010319.1692445-4-airlied@gmail.com

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

@@ -66,6 +66,8 @@
 static int amdgpu_ttm_backend_bind(struct ttm_bo_device *bdev,
 				   struct ttm_tt *ttm,
 				   struct ttm_resource *bo_mem);
+static void amdgpu_ttm_backend_unbind(struct ttm_bo_device *bdev,
+				      struct ttm_tt *ttm);
 
 static int amdgpu_ttm_init_on_chip(struct amdgpu_device *adev,
 				    unsigned int type,
@@ -561,11 +563,12 @@ static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
 		goto out_cleanup;
 	}
 
-	/* move BO (in tmp_mem) to new_mem */
+	r = ttm_bo_wait_ctx(bo, ctx);
-	r = ttm_bo_move_to_system(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);
@@ -682,9 +685,12 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 
 	if (old_mem->mem_type == TTM_PL_TT &&
 	    new_mem->mem_type == TTM_PL_SYSTEM) {
-		r = ttm_bo_move_to_system(bo, ctx);
+		r = ttm_bo_wait_ctx(bo, ctx);
 		if (r)
 			return r;
+
+		amdgpu_ttm_backend_unbind(bo->bdev, bo->ttm);
+		ttm_resource_free(bo, &bo->mem);
 		ttm_bo_assign_mem(bo, new_mem);
 		return 0;
 	}

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -46,6 +46,7 @@
 
 static int nouveau_ttm_tt_bind(struct ttm_bo_device *bdev, struct ttm_tt *ttm,
 			       struct ttm_resource *reg);
+static void nouveau_ttm_tt_unbind(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
 
 /*
  * NV10-NV40 tiling helpers
@@ -897,10 +898,12 @@ nouveau_bo_move_flipd(struct ttm_buffer_object *bo, bool evict,
 	if (ret)
 		goto out;
 
-	ret = ttm_bo_move_to_system(bo, ctx);
+	ret = ttm_bo_wait_ctx(bo, ctx);
 	if (ret)
 		goto out;
 
+	nouveau_ttm_tt_unbind(bo->bdev, bo->ttm);
+	ttm_resource_free(bo, &bo->mem);
 	ttm_bo_assign_mem(bo, &tmp_reg);
 out:
 	ttm_resource_free(bo, &tmp_reg);
@@ -1056,9 +1059,8 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict,
 
 	if (old_reg->mem_type == TTM_PL_TT &&
 	    new_reg->mem_type == TTM_PL_SYSTEM) {
-		ret = ttm_bo_move_to_system(bo, ctx);
+		nouveau_ttm_tt_unbind(bo->bdev, bo->ttm);
-		if (ret)
+		ttm_resource_free(bo, &bo->mem);
-			return ret;
 		ttm_bo_assign_mem(bo, new_reg);
 		goto out;
 	}

drivers/gpu/drm/radeon/radeon_ttm.c

@@ -59,6 +59,8 @@ static void radeon_ttm_debugfs_fini(struct radeon_device *rdev);
 static int radeon_ttm_tt_bind(struct ttm_bo_device *bdev,
 			      struct ttm_tt *ttm,
 			      struct ttm_resource *bo_mem);
+static void radeon_ttm_tt_unbind(struct ttm_bo_device *bdev,
+				 struct ttm_tt *ttm);
 
 struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
 {
@@ -244,10 +246,12 @@ static int radeon_move_vram_ram(struct ttm_buffer_object *bo,
 	if (unlikely(r)) {
 		goto out_cleanup;
 	}
-	r = ttm_bo_move_to_system(bo, ctx);
+	r = ttm_bo_wait_ctx(bo, ctx);
 	if (unlikely(r))
 		goto out_cleanup;
 
+	radeon_ttm_tt_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);
@@ -329,10 +333,8 @@ static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict,
 
 	if (old_mem->mem_type == TTM_PL_TT &&
 	    new_mem->mem_type == TTM_PL_SYSTEM) {
-		r = ttm_bo_move_to_system(bo, ctx);
+		radeon_ttm_tt_unbind(bo->bdev, bo->ttm);
-		if (r)
+		ttm_resource_free(bo, &bo->mem);
-			return r;
-
 		ttm_bo_assign_mem(bo, new_mem);
 		return 0;
 	}

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -65,27 +65,6 @@ int ttm_bo_move_to_new_tt_mem(struct ttm_buffer_object *bo,
 	return 0;
 }
 
-int ttm_bo_move_to_system(struct ttm_buffer_object *bo,
-			  struct ttm_operation_ctx *ctx)
-{
-	int ret;
-
-	if (bo->mem.mem_type == TTM_PL_SYSTEM)
-		return 0;
-
-	ret = ttm_bo_wait_ctx(bo, ctx);
-	if (unlikely(ret != 0)) {
-		if (ret != -ERESTARTSYS)
-			pr_err("Failed to expire sync object before unbinding TTM\n");
-		return ret;
-	}
-
-	ttm_bo_tt_unbind(bo);
-	ttm_resource_free(bo, &bo->mem);
-	return 0;
-}
-EXPORT_SYMBOL(ttm_bo_move_to_system);
-
 int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
 		       struct ttm_resource *mem)
 {

drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c

@@ -742,9 +742,12 @@ static int vmw_move(struct ttm_buffer_object *bo,
 			ttm_bo_assign_mem(bo, new_mem);
 			return 0;
 		}
-		ret = ttm_bo_move_to_system(bo, ctx);
+		ret = ttm_bo_wait_ctx(bo, ctx);
 		if (ret)
 			return ret;
+
+		vmw_ttm_unbind(bo->bdev, bo->ttm);
+		ttm_resource_free(bo, &bo->mem);
 		ttm_bo_assign_mem(bo, new_mem);
 		return 0;
 	} else {

include/drm/ttm/ttm_bo_driver.h

@@ -574,8 +574,6 @@ void ttm_mem_io_free(struct ttm_bo_device *bdev,
 int ttm_bo_move_to_new_tt_mem(struct ttm_buffer_object *bo,
 			      struct ttm_operation_ctx *ctx,
 			      struct ttm_resource *new_mem);
-int ttm_bo_move_to_system(struct ttm_buffer_object *bo,
-			  struct ttm_operation_ctx *ctx);
 
 /**
  * ttm_bo_move_memcpy