drm/ttm: revert "prevent moving of pinned BOs"

This reverts commit b49323aa.

This still seems to break i915.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230125155023.105584-1-christian.koenig@amd.com

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

@@ -466,7 +466,11 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 			return r;
 	}
 
+	/* Can't move a pinned BO */
 	abo = ttm_to_amdgpu_bo(bo);
+	if (WARN_ON_ONCE(abo->tbo.pin_count > 0))
+		return -EINVAL;
+
 	adev = amdgpu_ttm_adev(bo->bdev);
 
 	if (!old_mem || (old_mem->mem_type == TTM_PL_SYSTEM &&

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -1015,6 +1015,9 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict,
 	if (ret)
 		goto out_ntfy;
 
+	if (nvbo->bo.pin_count)
+		NV_WARN(drm, "Moving pinned object %p!\n", nvbo);
+
 	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
 		ret = nouveau_bo_vm_bind(bo, new_reg, &new_tile);
 		if (ret)

drivers/gpu/drm/radeon/radeon_ttm.c

@@ -211,7 +211,11 @@ static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict,
 	if (r)
 		return r;
 
+	/* Can't move a pinned BO */
 	rbo = container_of(bo, struct radeon_bo, tbo);
+	if (WARN_ON_ONCE(rbo->tbo.pin_count > 0))
+		return -EINVAL;
+
 	rdev = radeon_get_rdev(bo->bdev);
 	if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 		ttm_bo_move_null(bo, new_mem);

drivers/gpu/drm/ttm/ttm_bo.c

@@ -894,18 +894,14 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
 	if (!placement->num_placement && !placement->num_busy_placement)
 		return ttm_bo_pipeline_gutting(bo);
 
-	/* Check whether we need to move buffer. */
-	if (bo->resource && ttm_resource_compat(bo->resource, placement))
-		return 0;
-
-	/* Moving of pinned BOs is forbidden */
-	if (bo->pin_count)
-		return -EINVAL;
-
-	ret = ttm_bo_move_buffer(bo, placement, ctx);
-	if (ret)
-		return ret;
-
+	/*
+	 * Check whether we need to move buffer.
+	 */
+	if (!bo->resource || !ttm_resource_compat(bo->resource, placement)) {
+		ret = ttm_bo_move_buffer(bo, placement, ctx);
+		if (ret)
+			return ret;
+	}
 	/*
 	 * We might need to add a TTM.
 	 */

drivers/gpu/drm/ttm/ttm_resource.c

@@ -361,6 +361,7 @@ bool ttm_resource_compat(struct ttm_resource *res,
 
 	return false;
 }
+EXPORT_SYMBOL(ttm_resource_compat);
 
 void ttm_resource_set_bo(struct ttm_resource *res,
 			 struct ttm_buffer_object *bo)

drivers/gpu/drm/vmwgfx/vmwgfx_bo.c

@@ -87,7 +87,12 @@ int vmw_bo_pin_in_placement(struct vmw_private *dev_priv,
 	if (unlikely(ret != 0))
 		goto err;
 
-	ret = ttm_bo_validate(bo, placement, &ctx);
+	if (buf->base.pin_count > 0)
+		ret = ttm_resource_compat(bo->resource, placement)
+			? 0 : -EINVAL;
+	else
+		ret = ttm_bo_validate(bo, placement, &ctx);
+
 	if (!ret)
 		vmw_bo_pin_reserved(buf, true);
 
@@ -123,6 +128,12 @@ int vmw_bo_pin_in_vram_or_gmr(struct vmw_private *dev_priv,
 	if (unlikely(ret != 0))
 		goto err;
 
+	if (buf->base.pin_count > 0) {
+		ret = ttm_resource_compat(bo->resource, &vmw_vram_gmr_placement)
+			? 0 : -EINVAL;
+		goto out_unreserve;
+	}
+
 	ret = ttm_bo_validate(bo, &vmw_vram_gmr_placement, &ctx);
 	if (likely(ret == 0) || ret == -ERESTARTSYS)
 		goto out_unreserve;
@@ -207,7 +218,11 @@ int vmw_bo_pin_in_start_of_vram(struct vmw_private *dev_priv,
 		(void) ttm_bo_validate(bo, &vmw_sys_placement, &ctx);
 	}
 
-	ret = ttm_bo_validate(bo, &placement, &ctx);
+	if (buf->base.pin_count > 0)
+		ret = ttm_resource_compat(bo->resource, &placement)
+			? 0 : -EINVAL;
+	else
+		ret = ttm_bo_validate(bo, &placement, &ctx);
 
 	/* For some reason we didn't end up at the start of vram */
 	WARN_ON(ret == 0 && bo->resource->start != 0);