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 <drm/drmP.h>
26 #include <linux/dma-buf.h>
27 
28 #include "nouveau_drv.h"
29 #include "nouveau_gem.h"
30 
31 struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
32 {
33 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
34 	int npages = nvbo->bo.num_pages;
35 
36 	return drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
37 }
38 
39 void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)
40 {
41 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
42 	int ret;
43 
44 	ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
45 			  &nvbo->dma_buf_vmap);
46 	if (ret)
47 		return ERR_PTR(ret);
48 
49 	return nvbo->dma_buf_vmap.virtual;
50 }
51 
52 void nouveau_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
53 {
54 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
55 
56 	ttm_bo_kunmap(&nvbo->dma_buf_vmap);
57 }
58 
59 struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
60 							 struct dma_buf_attachment *attach,
61 							 struct sg_table *sg)
62 {
63 	struct nouveau_drm *drm = nouveau_drm(dev);
64 	struct nouveau_bo *nvbo;
65 	struct reservation_object *robj = attach->dmabuf->resv;
66 	u32 flags = 0;
67 	int ret;
68 
69 	flags = TTM_PL_FLAG_TT;
70 
71 	ww_mutex_lock(&robj->lock, NULL);
72 	ret = nouveau_bo_new(&drm->client, attach->dmabuf->size, 0, flags, 0, 0,
73 			     sg, robj, &nvbo);
74 	ww_mutex_unlock(&robj->lock);
75 	if (ret)
76 		return ERR_PTR(ret);
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->gem, nvbo->bo.mem.size);
83 	if (ret) {
84 		nouveau_bo_ref(NULL, &nvbo);
85 		return ERR_PTR(-ENOMEM);
86 	}
87 
88 	return &nvbo->gem;
89 }
90 
91 int nouveau_gem_prime_pin(struct drm_gem_object *obj)
92 {
93 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
94 	int ret;
95 
96 	/* pin buffer into GTT */
97 	ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT, false);
98 	if (ret)
99 		return -EINVAL;
100 
101 	return 0;
102 }
103 
104 void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
105 {
106 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
107 
108 	nouveau_bo_unpin(nvbo);
109 }
110 
111 struct reservation_object *nouveau_gem_prime_res_obj(struct drm_gem_object *obj)
112 {
113 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
114 
115 	return nvbo->bo.resv;
116 }
117