drivers/gpu/drm/i915/i915_gem_dmabuf.h

/*
 * Copyright 2016 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef _I915_GEM_DMABUF_H_
#define _I915_GEM_DMABUF_H_

#include <linux/dma-buf.h>

static inline struct reservation_object *
i915_gem_object_get_dmabuf_resv(struct drm_i915_gem_object *obj)
{
	struct dma_buf *dma_buf;

	if (obj->base.dma_buf)
		dma_buf = obj->base.dma_buf;
	else if (obj->base.import_attach)
		dma_buf = obj->base.import_attach->dmabuf;
	else
		return NULL;

	return dma_buf->resv;
}

#endif