1 /*
2  * Copyright 2014 Canonical
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Andreas Pokorny
23  */
24 
25 #include <drm/drm_prime.h>
26 
27 #include "virtgpu_drv.h"
28 
29 /* Empty Implementations as there should not be any other driver for a virtual
30  * device that might share buffers with virtgpu
31  */
32 
33 struct sg_table *virtgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
34 {
35 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
36 
37 	if (!bo->tbo.ttm->pages || !bo->tbo.ttm->num_pages)
38 		/* should not happen */
39 		return ERR_PTR(-EINVAL);
40 
41 	return drm_prime_pages_to_sg(bo->tbo.ttm->pages,
42 				     bo->tbo.ttm->num_pages);
43 }
44 
45 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
46 	struct drm_device *dev, struct dma_buf_attachment *attach,
47 	struct sg_table *table)
48 {
49 	return ERR_PTR(-ENODEV);
50 }
51 
52 void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
53 {
54 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
55 	int ret;
56 
57 	ret = virtio_gpu_object_kmap(bo);
58 	if (ret)
59 		return NULL;
60 	return bo->vmap;
61 }
62 
63 void virtgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
64 {
65 	virtio_gpu_object_kunmap(gem_to_virtio_gpu_obj(obj));
66 }
67 
68 int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,
69 			   struct vm_area_struct *vma)
70 {
71 	return drm_gem_prime_mmap(obj, vma);
72 }
73