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e9bf5f36 DA |
1 | /* |
2 | * Copyright 2011 Red Hat 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 | * Authors: Dave Airlie | |
23 | */ | |
22b33e8e DA |
24 | |
25 | #include "drmP.h" | |
26 | #include "drm.h" | |
27 | ||
28 | #include "nouveau_drv.h" | |
29 | #include "nouveau_drm.h" | |
30 | #include "nouveau_dma.h" | |
31 | ||
32 | #include <linux/dma-buf.h> | |
33 | ||
34 | static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment, | |
35 | enum dma_data_direction dir) | |
36 | { | |
37 | struct nouveau_bo *nvbo = attachment->dmabuf->priv; | |
38 | struct drm_device *dev = nvbo->gem->dev; | |
39 | int npages = nvbo->bo.num_pages; | |
40 | struct sg_table *sg; | |
41 | int nents; | |
42 | ||
43 | mutex_lock(&dev->struct_mutex); | |
44 | sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages); | |
45 | nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
46 | mutex_unlock(&dev->struct_mutex); | |
47 | return sg; | |
48 | } | |
49 | ||
50 | static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, | |
51 | struct sg_table *sg, enum dma_data_direction dir) | |
52 | { | |
53 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
54 | sg_free_table(sg); | |
55 | kfree(sg); | |
56 | } | |
57 | ||
58 | static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf) | |
59 | { | |
60 | struct nouveau_bo *nvbo = dma_buf->priv; | |
61 | ||
62 | if (nvbo->gem->export_dma_buf == dma_buf) { | |
63 | nvbo->gem->export_dma_buf = NULL; | |
64 | drm_gem_object_unreference_unlocked(nvbo->gem); | |
65 | } | |
66 | } | |
67 | ||
68 | static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) | |
69 | { | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
74 | { | |
75 | ||
76 | } | |
77 | static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
78 | { | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
83 | { | |
84 | ||
85 | } | |
86 | ||
e1bbc4bf DA |
87 | static int nouveau_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
88 | { | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
35916ace DA |
92 | static void *nouveau_gem_prime_vmap(struct dma_buf *dma_buf) |
93 | { | |
94 | struct nouveau_bo *nvbo = dma_buf->priv; | |
95 | struct drm_device *dev = nvbo->gem->dev; | |
96 | int ret; | |
97 | ||
98 | mutex_lock(&dev->struct_mutex); | |
99 | if (nvbo->vmapping_count) { | |
100 | nvbo->vmapping_count++; | |
101 | goto out_unlock; | |
102 | } | |
103 | ||
104 | ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages, | |
105 | &nvbo->dma_buf_vmap); | |
106 | if (ret) { | |
107 | mutex_unlock(&dev->struct_mutex); | |
108 | return ERR_PTR(ret); | |
109 | } | |
110 | nvbo->vmapping_count = 1; | |
111 | out_unlock: | |
112 | mutex_unlock(&dev->struct_mutex); | |
113 | return nvbo->dma_buf_vmap.virtual; | |
114 | } | |
115 | ||
116 | static void nouveau_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
117 | { | |
118 | struct nouveau_bo *nvbo = dma_buf->priv; | |
119 | struct drm_device *dev = nvbo->gem->dev; | |
120 | ||
121 | mutex_lock(&dev->struct_mutex); | |
122 | nvbo->vmapping_count--; | |
123 | if (nvbo->vmapping_count == 0) { | |
124 | ttm_bo_kunmap(&nvbo->dma_buf_vmap); | |
125 | } | |
126 | mutex_unlock(&dev->struct_mutex); | |
127 | } | |
128 | ||
41ceeeb2 | 129 | static const struct dma_buf_ops nouveau_dmabuf_ops = { |
22b33e8e DA |
130 | .map_dma_buf = nouveau_gem_map_dma_buf, |
131 | .unmap_dma_buf = nouveau_gem_unmap_dma_buf, | |
132 | .release = nouveau_gem_dmabuf_release, | |
133 | .kmap = nouveau_gem_kmap, | |
134 | .kmap_atomic = nouveau_gem_kmap_atomic, | |
135 | .kunmap = nouveau_gem_kunmap, | |
136 | .kunmap_atomic = nouveau_gem_kunmap_atomic, | |
e1bbc4bf | 137 | .mmap = nouveau_gem_prime_mmap, |
35916ace DA |
138 | .vmap = nouveau_gem_prime_vmap, |
139 | .vunmap = nouveau_gem_prime_vunmap, | |
22b33e8e DA |
140 | }; |
141 | ||
142 | static int | |
143 | nouveau_prime_new(struct drm_device *dev, | |
144 | size_t size, | |
145 | struct sg_table *sg, | |
146 | struct nouveau_bo **pnvbo) | |
147 | { | |
148 | struct nouveau_bo *nvbo; | |
149 | u32 flags = 0; | |
150 | int ret; | |
151 | ||
152 | flags = TTM_PL_FLAG_TT; | |
153 | ||
154 | ret = nouveau_bo_new(dev, size, 0, flags, 0, 0, | |
155 | sg, pnvbo); | |
156 | if (ret) | |
157 | return ret; | |
158 | nvbo = *pnvbo; | |
159 | ||
160 | /* we restrict allowed domains on nv50+ to only the types | |
161 | * that were requested at creation time. not possibly on | |
162 | * earlier chips without busting the ABI. | |
163 | */ | |
164 | nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART; | |
165 | nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size); | |
166 | if (!nvbo->gem) { | |
167 | nouveau_bo_ref(NULL, pnvbo); | |
168 | return -ENOMEM; | |
169 | } | |
170 | ||
171 | nvbo->gem->driver_private = nvbo; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev, | |
176 | struct drm_gem_object *obj, int flags) | |
177 | { | |
178 | struct nouveau_bo *nvbo = nouveau_gem_object(obj); | |
179 | int ret = 0; | |
180 | ||
181 | /* pin buffer into GTT */ | |
182 | ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT); | |
183 | if (ret) | |
184 | return ERR_PTR(-EINVAL); | |
185 | ||
186 | return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags); | |
187 | } | |
188 | ||
189 | struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev, | |
190 | struct dma_buf *dma_buf) | |
191 | { | |
192 | struct dma_buf_attachment *attach; | |
193 | struct sg_table *sg; | |
194 | struct nouveau_bo *nvbo; | |
195 | int ret; | |
196 | ||
197 | if (dma_buf->ops == &nouveau_dmabuf_ops) { | |
198 | nvbo = dma_buf->priv; | |
199 | if (nvbo->gem) { | |
200 | if (nvbo->gem->dev == dev) { | |
201 | drm_gem_object_reference(nvbo->gem); | |
202 | return nvbo->gem; | |
203 | } | |
204 | } | |
205 | } | |
206 | /* need to attach */ | |
207 | attach = dma_buf_attach(dma_buf, dev->dev); | |
208 | if (IS_ERR(attach)) | |
209 | return ERR_PTR(PTR_ERR(attach)); | |
210 | ||
211 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); | |
212 | if (IS_ERR(sg)) { | |
213 | ret = PTR_ERR(sg); | |
214 | goto fail_detach; | |
215 | } | |
216 | ||
217 | ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo); | |
218 | if (ret) | |
219 | goto fail_unmap; | |
220 | ||
221 | nvbo->gem->import_attach = attach; | |
222 | ||
223 | return nvbo->gem; | |
224 | ||
225 | fail_unmap: | |
226 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
227 | fail_detach: | |
228 | dma_buf_detach(dma_buf, attach); | |
229 | return ERR_PTR(ret); | |
230 | } | |
231 |