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