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
34struct 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
42void *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
55void 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
62struct 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
86int 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 (unlikely(ret))
98		goto error;
99
100	if (bo->tbo.moving) {
101		ret = dma_fence_wait(bo->tbo.moving, false);
102		if (unlikely(ret)) {
103			radeon_bo_unpin(bo);
104			goto error;
105		}
106	}
107
108	bo->prime_shared_count++;
109error:
110	radeon_bo_unreserve(bo);
111	return ret;
112}
113
114void radeon_gem_prime_unpin(struct drm_gem_object *obj)
115{
116	struct radeon_bo *bo = gem_to_radeon_bo(obj);
117	int ret = 0;
118
119	ret = radeon_bo_reserve(bo, false);
120	if (unlikely(ret != 0))
121		return;
122
123	radeon_bo_unpin(bo);
124	if (bo->prime_shared_count)
125		bo->prime_shared_count--;
126	radeon_bo_unreserve(bo);
127}
128
129
130struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
131					int flags)
132{
133	struct radeon_bo *bo = gem_to_radeon_bo(gobj);
134	if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
135		return ERR_PTR(-EPERM);
136	return drm_gem_prime_export(gobj, flags);
137}
138