1 /* $NetBSD: radeon_prime.c,v 1.3 2021/12/18 23:45:43 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 Advanced Micro Devices, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * based on nouveau_prime.c
25 *
26 * Authors: Alex Deucher
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: radeon_prime.c,v 1.3 2021/12/18 23:45:43 riastradh Exp $");
31
32 #include <linux/dma-buf.h>
33
34 #include <drm/drm_prime.h>
35 #include <drm/radeon_drm.h>
36
37 #include "radeon.h"
38
radeon_gem_prime_get_sg_table(struct drm_gem_object * obj)39 struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
40 {
41 struct radeon_bo *bo = gem_to_radeon_bo(obj);
42 int npages = bo->tbo.num_pages;
43
44 return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
45 }
46
radeon_gem_prime_vmap(struct drm_gem_object * obj)47 void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
48 {
49 struct radeon_bo *bo = gem_to_radeon_bo(obj);
50 int ret;
51
52 ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
53 &bo->dma_buf_vmap);
54 if (ret)
55 return ERR_PTR(ret);
56
57 return bo->dma_buf_vmap.virtual;
58 }
59
radeon_gem_prime_vunmap(struct drm_gem_object * obj,void * vaddr)60 void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
61 {
62 struct radeon_bo *bo = gem_to_radeon_bo(obj);
63
64 ttm_bo_kunmap(&bo->dma_buf_vmap);
65 }
66
radeon_gem_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * sg)67 struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
68 struct dma_buf_attachment *attach,
69 struct sg_table *sg)
70 {
71 struct dma_resv *resv = attach->dmabuf->resv;
72 struct radeon_device *rdev = dev->dev_private;
73 struct radeon_bo *bo;
74 int ret;
75
76 dma_resv_lock(resv, NULL);
77 ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
78 RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
79 dma_resv_unlock(resv);
80 if (ret)
81 return ERR_PTR(ret);
82
83 mutex_lock(&rdev->gem.mutex);
84 list_add_tail(&bo->list, &rdev->gem.objects);
85 mutex_unlock(&rdev->gem.mutex);
86
87 bo->prime_shared_count = 1;
88 return &bo->tbo.base;
89 }
90
radeon_gem_prime_pin(struct drm_gem_object * obj)91 int radeon_gem_prime_pin(struct drm_gem_object *obj)
92 {
93 struct radeon_bo *bo = gem_to_radeon_bo(obj);
94 int ret = 0;
95
96 ret = radeon_bo_reserve(bo, false);
97 if (unlikely(ret != 0))
98 return ret;
99
100 /* pin buffer into GTT */
101 ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
102 if (likely(ret == 0))
103 bo->prime_shared_count++;
104
105 radeon_bo_unreserve(bo);
106 return ret;
107 }
108
radeon_gem_prime_unpin(struct drm_gem_object * obj)109 void radeon_gem_prime_unpin(struct drm_gem_object *obj)
110 {
111 struct radeon_bo *bo = gem_to_radeon_bo(obj);
112 int ret = 0;
113
114 ret = radeon_bo_reserve(bo, false);
115 if (unlikely(ret != 0))
116 return;
117
118 radeon_bo_unpin(bo);
119 if (bo->prime_shared_count)
120 bo->prime_shared_count--;
121 radeon_bo_unreserve(bo);
122 }
123
124
radeon_gem_prime_export(struct drm_gem_object * gobj,int flags)125 struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
126 int flags)
127 {
128 struct radeon_bo *bo = gem_to_radeon_bo(gobj);
129 if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
130 return ERR_PTR(-EPERM);
131 return drm_gem_prime_export(gobj, flags);
132 }
133