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  
radeon_gem_prime_get_sg_table(struct drm_gem_object * obj)37  struct 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  
radeon_gem_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * sg)45  struct 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  
radeon_gem_prime_pin(struct drm_gem_object * obj)71  int 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  	/* 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  	return ret;
82  }
83  
radeon_gem_prime_unpin(struct drm_gem_object * obj)84  void radeon_gem_prime_unpin(struct drm_gem_object *obj)
85  {
86  	struct radeon_bo *bo = gem_to_radeon_bo(obj);
87  
88  	radeon_bo_unpin(bo);
89  	if (bo->prime_shared_count)
90  		bo->prime_shared_count--;
91  }
92  
93  
radeon_gem_prime_export(struct drm_gem_object * gobj,int flags)94  struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
95  					int flags)
96  {
97  	struct radeon_bo *bo = gem_to_radeon_bo(gobj);
98  	if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
99  		return ERR_PTR(-EPERM);
100  	return drm_gem_prime_export(gobj, flags);
101  }
102