1 /*
2  * Copyright 2012 Advanced Micro Devices, 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  * based on nouveau_prime.c
23  *
24  * Authors: Alex Deucher
25  */
26 #include <drm/drmP.h>
27 
28 #include "radeon.h"
29 #include <drm/radeon_drm.h>
30 #include <linux/dma-buf.h>
31 
32 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
33 {
34 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
35 	int npages = bo->tbo.num_pages;
36 
37 	return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
38 }
39 
40 void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
41 {
42 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
43 	int ret;
44 
45 	ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
46 			  &bo->dma_buf_vmap);
47 	if (ret)
48 		return ERR_PTR(ret);
49 
50 	return bo->dma_buf_vmap.virtual;
51 }
52 
53 void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
54 {
55 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
56 
57 	ttm_bo_kunmap(&bo->dma_buf_vmap);
58 }
59 
60 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
61 							struct dma_buf_attachment *attach,
62 							struct sg_table *sg)
63 {
64 	struct reservation_object *resv = attach->dmabuf->resv;
65 	struct radeon_device *rdev = dev->dev_private;
66 	struct radeon_bo *bo;
67 	int ret;
68 
69 	ww_mutex_lock(&resv->lock, NULL);
70 	ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
71 			       RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
72 	ww_mutex_unlock(&resv->lock);
73 	if (ret)
74 		return ERR_PTR(ret);
75 
76 	mutex_lock(&rdev->gem.mutex);
77 	list_add_tail(&bo->list, &rdev->gem.objects);
78 	mutex_unlock(&rdev->gem.mutex);
79 
80 	return &bo->gem_base;
81 }
82 
83 int radeon_gem_prime_pin(struct drm_gem_object *obj)
84 {
85 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
86 	int ret = 0;
87 
88 	ret = radeon_bo_reserve(bo, false);
89 	if (unlikely(ret != 0))
90 		return ret;
91 
92 	/* pin buffer into GTT */
93 	ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
94 	radeon_bo_unreserve(bo);
95 	return ret;
96 }
97 
98 void radeon_gem_prime_unpin(struct drm_gem_object *obj)
99 {
100 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
101 	int ret = 0;
102 
103 	ret = radeon_bo_reserve(bo, false);
104 	if (unlikely(ret != 0))
105 		return;
106 
107 	radeon_bo_unpin(bo);
108 	radeon_bo_unreserve(bo);
109 }
110 
111 
112 struct reservation_object *radeon_gem_prime_res_obj(struct drm_gem_object *obj)
113 {
114 	struct radeon_bo *bo = gem_to_radeon_bo(obj);
115 
116 	return bo->tbo.resv;
117 }
118 
119 struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
120 					struct drm_gem_object *gobj,
121 					int flags)
122 {
123 	struct radeon_bo *bo = gem_to_radeon_bo(gobj);
124 	if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
125 		return ERR_PTR(-EPERM);
126 	return drm_gem_prime_export(dev, gobj, flags);
127 }
128