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