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40f5cf99 AD |
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 | */ | |
760285e7 | 26 | #include <drm/drmP.h> |
40f5cf99 AD |
27 | |
28 | #include "radeon.h" | |
760285e7 | 29 | #include <drm/radeon_drm.h> |
40f5cf99 AD |
30 | |
31 | #include <linux/dma-buf.h> | |
32 | ||
33 | static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment, | |
34 | enum dma_data_direction dir) | |
35 | { | |
36 | struct radeon_bo *bo = attachment->dmabuf->priv; | |
37 | struct drm_device *dev = bo->rdev->ddev; | |
38 | int npages = bo->tbo.num_pages; | |
39 | struct sg_table *sg; | |
40 | int nents; | |
41 | ||
42 | mutex_lock(&dev->struct_mutex); | |
43 | sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages); | |
44 | nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
45 | mutex_unlock(&dev->struct_mutex); | |
46 | return sg; | |
47 | } | |
48 | ||
49 | static void radeon_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, | |
50 | struct sg_table *sg, enum dma_data_direction dir) | |
51 | { | |
52 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
53 | sg_free_table(sg); | |
54 | kfree(sg); | |
55 | } | |
56 | ||
57 | static void radeon_gem_dmabuf_release(struct dma_buf *dma_buf) | |
58 | { | |
59 | struct radeon_bo *bo = dma_buf->priv; | |
60 | ||
61 | if (bo->gem_base.export_dma_buf == dma_buf) { | |
62 | DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base); | |
63 | bo->gem_base.export_dma_buf = NULL; | |
64 | drm_gem_object_unreference_unlocked(&bo->gem_base); | |
65 | } | |
66 | } | |
67 | ||
68 | static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) | |
69 | { | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
74 | { | |
75 | ||
76 | } | |
77 | static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
78 | { | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
83 | { | |
84 | ||
85 | } | |
86 | ||
946c7491 DA |
87 | static int radeon_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
88 | { | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
63bc620b DA |
92 | static void *radeon_gem_prime_vmap(struct dma_buf *dma_buf) |
93 | { | |
94 | struct radeon_bo *bo = dma_buf->priv; | |
95 | struct drm_device *dev = bo->rdev->ddev; | |
96 | int ret; | |
97 | ||
98 | mutex_lock(&dev->struct_mutex); | |
99 | if (bo->vmapping_count) { | |
100 | bo->vmapping_count++; | |
101 | goto out_unlock; | |
102 | } | |
103 | ||
104 | ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, | |
105 | &bo->dma_buf_vmap); | |
106 | if (ret) { | |
107 | mutex_unlock(&dev->struct_mutex); | |
108 | return ERR_PTR(ret); | |
109 | } | |
110 | bo->vmapping_count = 1; | |
111 | out_unlock: | |
112 | mutex_unlock(&dev->struct_mutex); | |
113 | return bo->dma_buf_vmap.virtual; | |
114 | } | |
115 | ||
116 | static void radeon_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
117 | { | |
118 | struct radeon_bo *bo = dma_buf->priv; | |
119 | struct drm_device *dev = bo->rdev->ddev; | |
120 | ||
121 | mutex_lock(&dev->struct_mutex); | |
122 | bo->vmapping_count--; | |
123 | if (bo->vmapping_count == 0) { | |
124 | ttm_bo_kunmap(&bo->dma_buf_vmap); | |
125 | } | |
126 | mutex_unlock(&dev->struct_mutex); | |
127 | } | |
41ceeeb2 | 128 | const static struct dma_buf_ops radeon_dmabuf_ops = { |
40f5cf99 AD |
129 | .map_dma_buf = radeon_gem_map_dma_buf, |
130 | .unmap_dma_buf = radeon_gem_unmap_dma_buf, | |
131 | .release = radeon_gem_dmabuf_release, | |
132 | .kmap = radeon_gem_kmap, | |
133 | .kmap_atomic = radeon_gem_kmap_atomic, | |
134 | .kunmap = radeon_gem_kunmap, | |
135 | .kunmap_atomic = radeon_gem_kunmap_atomic, | |
946c7491 | 136 | .mmap = radeon_gem_prime_mmap, |
63bc620b DA |
137 | .vmap = radeon_gem_prime_vmap, |
138 | .vunmap = radeon_gem_prime_vunmap, | |
40f5cf99 AD |
139 | }; |
140 | ||
141 | static int radeon_prime_create(struct drm_device *dev, | |
142 | size_t size, | |
143 | struct sg_table *sg, | |
144 | struct radeon_bo **pbo) | |
145 | { | |
146 | struct radeon_device *rdev = dev->dev_private; | |
147 | struct radeon_bo *bo; | |
148 | int ret; | |
149 | ||
150 | ret = radeon_bo_create(rdev, size, PAGE_SIZE, false, | |
151 | RADEON_GEM_DOMAIN_GTT, sg, pbo); | |
152 | if (ret) | |
153 | return ret; | |
154 | bo = *pbo; | |
155 | bo->gem_base.driver_private = bo; | |
156 | ||
157 | mutex_lock(&rdev->gem.mutex); | |
158 | list_add_tail(&bo->list, &rdev->gem.objects); | |
159 | mutex_unlock(&rdev->gem.mutex); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | struct dma_buf *radeon_gem_prime_export(struct drm_device *dev, | |
165 | struct drm_gem_object *obj, | |
166 | int flags) | |
167 | { | |
168 | struct radeon_bo *bo = gem_to_radeon_bo(obj); | |
169 | int ret = 0; | |
170 | ||
489797d5 DA |
171 | ret = radeon_bo_reserve(bo, false); |
172 | if (unlikely(ret != 0)) | |
173 | return ERR_PTR(ret); | |
174 | ||
40f5cf99 AD |
175 | /* pin buffer into GTT */ |
176 | ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL); | |
489797d5 DA |
177 | if (ret) { |
178 | radeon_bo_unreserve(bo); | |
40f5cf99 | 179 | return ERR_PTR(ret); |
489797d5 DA |
180 | } |
181 | radeon_bo_unreserve(bo); | |
40f5cf99 AD |
182 | return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags); |
183 | } | |
184 | ||
185 | struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, | |
186 | struct dma_buf *dma_buf) | |
187 | { | |
188 | struct dma_buf_attachment *attach; | |
189 | struct sg_table *sg; | |
190 | struct radeon_bo *bo; | |
191 | int ret; | |
192 | ||
193 | if (dma_buf->ops == &radeon_dmabuf_ops) { | |
194 | bo = dma_buf->priv; | |
195 | if (bo->gem_base.dev == dev) { | |
196 | drm_gem_object_reference(&bo->gem_base); | |
197 | return &bo->gem_base; | |
198 | } | |
199 | } | |
200 | ||
201 | /* need to attach */ | |
202 | attach = dma_buf_attach(dma_buf, dev->dev); | |
203 | if (IS_ERR(attach)) | |
204 | return ERR_CAST(attach); | |
205 | ||
206 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); | |
207 | if (IS_ERR(sg)) { | |
208 | ret = PTR_ERR(sg); | |
209 | goto fail_detach; | |
210 | } | |
211 | ||
212 | ret = radeon_prime_create(dev, dma_buf->size, sg, &bo); | |
213 | if (ret) | |
214 | goto fail_unmap; | |
215 | ||
216 | bo->gem_base.import_attach = attach; | |
217 | ||
218 | return &bo->gem_base; | |
219 | ||
220 | fail_unmap: | |
221 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
222 | fail_detach: | |
223 | dma_buf_detach(dma_buf, attach); | |
224 | return ERR_PTR(ret); | |
225 | } |