1/*
2 * Copyright 2011 Red Hat Inc.
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: Dave Airlie
23 */
24
25#include <linux/dma-buf.h>
26#include <drm/ttm/ttm_tt.h>
27
28#include "nouveau_drv.h"
29#include "nouveau_gem.h"
30
31struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
32{
33	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
34
35	return drm_prime_pages_to_sg(obj->dev, nvbo->bo.ttm->pages,
36				     nvbo->bo.ttm->num_pages);
37}
38
39struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
40							 struct dma_buf_attachment *attach,
41							 struct sg_table *sg)
42{
43	struct nouveau_drm *drm = nouveau_drm(dev);
44	struct drm_gem_object *obj;
45	struct nouveau_bo *nvbo;
46	struct dma_resv *robj = attach->dmabuf->resv;
47	u64 size = attach->dmabuf->size;
48	int align = 0;
49	int ret;
50
51	dma_resv_lock(robj, NULL);
52	nvbo = nouveau_bo_alloc(&drm->client, &size, &align,
53				NOUVEAU_GEM_DOMAIN_GART, 0, 0, true);
54	if (IS_ERR(nvbo)) {
55		obj = ERR_CAST(nvbo);
56		goto unlock;
57	}
58
59	nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
60
61	nvbo->bo.base.funcs = &nouveau_gem_object_funcs;
62
63	/* Initialize the embedded gem-object. We return a single gem-reference
64	 * to the caller, instead of a normal nouveau_bo ttm reference. */
65	ret = drm_gem_object_init(dev, &nvbo->bo.base, size);
66	if (ret) {
67		nouveau_bo_ref(NULL, &nvbo);
68		obj = ERR_PTR(-ENOMEM);
69		goto unlock;
70	}
71
72	ret = nouveau_bo_init(nvbo, size, align, NOUVEAU_GEM_DOMAIN_GART,
73			      sg, robj);
74	if (ret) {
75		obj = ERR_PTR(ret);
76		goto unlock;
77	}
78
79	obj = &nvbo->bo.base;
80
81unlock:
82	dma_resv_unlock(robj);
83	return obj;
84}
85
86int nouveau_gem_prime_pin(struct drm_gem_object *obj)
87{
88	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
89	int ret;
90
91	/* pin buffer into GTT */
92	ret = nouveau_bo_pin(nvbo, NOUVEAU_GEM_DOMAIN_GART, false);
93	if (ret)
94		return -EINVAL;
95
96	return 0;
97}
98
99void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
100{
101	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
102
103	nouveau_bo_unpin(nvbo);
104}
105
106struct dma_buf *nouveau_gem_prime_export(struct drm_gem_object *gobj,
107					 int flags)
108{
109	struct nouveau_bo *nvbo = nouveau_gem_object(gobj);
110
111	if (nvbo->no_share)
112		return ERR_PTR(-EPERM);
113
114	return drm_gem_prime_export(gobj, flags);
115}
116