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
27#include "nouveau_drv.h"
28#include "nouveau_gem.h"
29
30struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
31{
32	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
33	int npages = nvbo->bo.num_pages;
34
35	return drm_prime_pages_to_sg(obj->dev, nvbo->bo.ttm->pages, npages);
36}
37
38void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)
39{
40	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
41	int ret;
42
43	ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
44			  &nvbo->dma_buf_vmap);
45	if (ret)
46		return ERR_PTR(ret);
47
48	return nvbo->dma_buf_vmap.virtual;
49}
50
51void nouveau_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
52{
53	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
54
55	ttm_bo_kunmap(&nvbo->dma_buf_vmap);
56}
57
58struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
59							 struct dma_buf_attachment *attach,
60							 struct sg_table *sg)
61{
62	struct nouveau_drm *drm = nouveau_drm(dev);
63	struct drm_gem_object *obj;
64	struct nouveau_bo *nvbo;
65	struct dma_resv *robj = attach->dmabuf->resv;
66	u64 size = attach->dmabuf->size;
67	int align = 0;
68	int ret;
69
70	dma_resv_lock(robj, NULL);
71	nvbo = nouveau_bo_alloc(&drm->client, &size, &align,
72				NOUVEAU_GEM_DOMAIN_GART, 0, 0);
73	if (IS_ERR(nvbo)) {
74		obj = ERR_CAST(nvbo);
75		goto unlock;
76	}
77
78	nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
79
80	/* Initialize the embedded gem-object. We return a single gem-reference
81	 * to the caller, instead of a normal nouveau_bo ttm reference. */
82	ret = drm_gem_object_init(dev, &nvbo->bo.base, size);
83	if (ret) {
84		nouveau_bo_ref(NULL, &nvbo);
85		obj = ERR_PTR(-ENOMEM);
86		goto unlock;
87	}
88
89	ret = nouveau_bo_init(nvbo, size, align, NOUVEAU_GEM_DOMAIN_GART,
90			      sg, robj);
91	if (ret) {
92		obj = ERR_PTR(ret);
93		goto unlock;
94	}
95
96	obj = &nvbo->bo.base;
97
98unlock:
99	dma_resv_unlock(robj);
100	return obj;
101}
102
103int nouveau_gem_prime_pin(struct drm_gem_object *obj)
104{
105	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
106	int ret;
107
108	/* pin buffer into GTT */
109	ret = nouveau_bo_pin(nvbo, NOUVEAU_GEM_DOMAIN_GART, false);
110	if (ret)
111		return -EINVAL;
112
113	ret = ttm_bo_reserve(&nvbo->bo, false, false, NULL);
114	if (ret)
115		goto error;
116
117	if (nvbo->bo.moving)
118		ret = dma_fence_wait(nvbo->bo.moving, true);
119
120	ttm_bo_unreserve(&nvbo->bo);
121	if (ret)
122		goto error;
123
124	return ret;
125
126error:
127	nouveau_bo_unpin(nvbo);
128	return ret;
129}
130
131void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
132{
133	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
134
135	nouveau_bo_unpin(nvbo);
136}
137