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(obj->dev, bo->tbo.ttm->pages,
42				     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(resv, NULL);
55	ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
56			       RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
57	dma_resv_unlock(resv);
58	if (ret)
59		return ERR_PTR(ret);
60
61	bo->tbo.base.funcs = &radeon_gem_object_funcs;
62
63	mutex_lock(&rdev->gem.mutex);
64	list_add_tail(&bo->list, &rdev->gem.objects);
65	mutex_unlock(&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, 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, 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(bo->rdev, bo->tbo.ttm))
110		return ERR_PTR(-EPERM);
111	return drm_gem_prime_export(gobj, flags);
112}
113