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 <drm/ttm/ttm_tt.h>
33
34#include "radeon.h"
35#include "radeon_prime.h"
36
37struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
38{
39 struct radeon_bo *bo = gem_to_radeon_bo(obj);
40
41 return drm_prime_pages_to_sg(dev: obj->dev, pages: bo->tbo.ttm->pages,
42 nr_pages: bo->tbo.ttm->num_pages);
43}
44
45struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
46 struct dma_buf_attachment *attach,
47 struct sg_table *sg)
48{
49 struct dma_resv *resv = attach->dmabuf->resv;
50 struct radeon_device *rdev = dev->dev_private;
51 struct radeon_bo *bo;
52 int ret;
53
54 dma_resv_lock(obj: resv, NULL);
55 ret = radeon_bo_create(rdev, size: attach->dmabuf->size, PAGE_SIZE, kernel: false,
56 RADEON_GEM_DOMAIN_GTT, flags: 0, sg, resv, bo_ptr: &bo);
57 dma_resv_unlock(obj: resv);
58 if (ret)
59 return ERR_PTR(error: ret);
60
61 bo->tbo.base.funcs = &radeon_gem_object_funcs;
62
63 mutex_lock(&rdev->gem.mutex);
64 list_add_tail(new: &bo->list, head: &rdev->gem.objects);
65 mutex_unlock(lock: &rdev->gem.mutex);
66
67 bo->prime_shared_count = 1;
68 return &bo->tbo.base;
69}
70
71int radeon_gem_prime_pin(struct drm_gem_object *obj)
72{
73 struct radeon_bo *bo = gem_to_radeon_bo(obj);
74 int ret = 0;
75
76 ret = radeon_bo_reserve(bo, no_intr: false);
77 if (unlikely(ret != 0))
78 return ret;
79
80 /* pin buffer into GTT */
81 ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
82 if (likely(ret == 0))
83 bo->prime_shared_count++;
84
85 radeon_bo_unreserve(bo);
86 return ret;
87}
88
89void radeon_gem_prime_unpin(struct drm_gem_object *obj)
90{
91 struct radeon_bo *bo = gem_to_radeon_bo(obj);
92 int ret = 0;
93
94 ret = radeon_bo_reserve(bo, no_intr: false);
95 if (unlikely(ret != 0))
96 return;
97
98 radeon_bo_unpin(bo);
99 if (bo->prime_shared_count)
100 bo->prime_shared_count--;
101 radeon_bo_unreserve(bo);
102}
103
104
105struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
106 int flags)
107{
108 struct radeon_bo *bo = gem_to_radeon_bo(gobj);
109 if (radeon_ttm_tt_has_userptr(rdev: bo->rdev, ttm: bo->tbo.ttm))
110 return ERR_PTR(error: -EPERM);
111 return drm_gem_prime_export(obj: gobj, flags);
112}
113

source code of linux/drivers/gpu/drm/radeon/radeon_prime.c