Commit | Line | Data |
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1286ff73 DV |
1 | /* |
2 | * Copyright 2012 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 (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
21 | * DEALINGS IN THE SOFTWARE. | |
22 | * | |
23 | * Authors: | |
24 | * Dave Airlie <airlied@redhat.com> | |
25 | */ | |
760285e7 | 26 | #include <drm/drmP.h> |
1286ff73 DV |
27 | #include "i915_drv.h" |
28 | #include <linux/dma-buf.h> | |
29 | ||
6a101cb2 | 30 | static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
9da3da66 | 31 | enum dma_data_direction dir) |
1286ff73 DV |
32 | { |
33 | struct drm_i915_gem_object *obj = attachment->dmabuf->priv; | |
9da3da66 CW |
34 | struct sg_table *st; |
35 | struct scatterlist *src, *dst; | |
36 | int ret, i; | |
1286ff73 | 37 | |
9da3da66 | 38 | ret = i915_mutex_lock_interruptible(obj->base.dev); |
1286ff73 DV |
39 | if (ret) |
40 | return ERR_PTR(ret); | |
41 | ||
37e680a1 | 42 | ret = i915_gem_object_get_pages(obj); |
6c085a72 | 43 | if (ret) { |
9da3da66 CW |
44 | st = ERR_PTR(ret); |
45 | goto out; | |
46 | } | |
47 | ||
48 | /* Copy sg so that we make an independent mapping */ | |
49 | st = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
50 | if (st == NULL) { | |
51 | st = ERR_PTR(-ENOMEM); | |
52 | goto out; | |
1286ff73 DV |
53 | } |
54 | ||
9da3da66 CW |
55 | ret = sg_alloc_table(st, obj->pages->nents, GFP_KERNEL); |
56 | if (ret) { | |
57 | kfree(st); | |
58 | st = ERR_PTR(ret); | |
59 | goto out; | |
60 | } | |
61 | ||
62 | src = obj->pages->sgl; | |
63 | dst = st->sgl; | |
64 | for (i = 0; i < obj->pages->nents; i++) { | |
65 | sg_set_page(dst, sg_page(src), PAGE_SIZE, 0); | |
66 | dst = sg_next(dst); | |
67 | src = sg_next(src); | |
68 | } | |
69 | ||
70 | if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { | |
71 | sg_free_table(st); | |
72 | kfree(st); | |
73 | st = ERR_PTR(-ENOMEM); | |
6c085a72 | 74 | goto out; |
1286ff73 DV |
75 | } |
76 | ||
a5570178 CW |
77 | i915_gem_object_pin_pages(obj); |
78 | ||
1286ff73 | 79 | out: |
9da3da66 CW |
80 | mutex_unlock(&obj->base.dev->struct_mutex); |
81 | return st; | |
1286ff73 DV |
82 | } |
83 | ||
6a101cb2 | 84 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
2f745ad3 CW |
85 | struct sg_table *sg, |
86 | enum dma_data_direction dir) | |
1286ff73 DV |
87 | { |
88 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); | |
89 | sg_free_table(sg); | |
90 | kfree(sg); | |
91 | } | |
92 | ||
6a101cb2 | 93 | static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |
1286ff73 DV |
94 | { |
95 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
96 | ||
97 | if (obj->base.export_dma_buf == dma_buf) { | |
98 | /* drop the reference on the export fd holds */ | |
99 | obj->base.export_dma_buf = NULL; | |
100 | drm_gem_object_unreference_unlocked(&obj->base); | |
101 | } | |
102 | } | |
103 | ||
9a70cc2a DA |
104 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
105 | { | |
106 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
107 | struct drm_device *dev = obj->base.dev; | |
9da3da66 CW |
108 | struct scatterlist *sg; |
109 | struct page **pages; | |
110 | int ret, i; | |
9a70cc2a DA |
111 | |
112 | ret = i915_mutex_lock_interruptible(dev); | |
113 | if (ret) | |
114 | return ERR_PTR(ret); | |
115 | ||
116 | if (obj->dma_buf_vmapping) { | |
117 | obj->vmapping_count++; | |
118 | goto out_unlock; | |
119 | } | |
120 | ||
37e680a1 | 121 | ret = i915_gem_object_get_pages(obj); |
9da3da66 CW |
122 | if (ret) |
123 | goto error; | |
9a70cc2a | 124 | |
9da3da66 CW |
125 | ret = -ENOMEM; |
126 | ||
127 | pages = drm_malloc_ab(obj->pages->nents, sizeof(struct page *)); | |
128 | if (pages == NULL) | |
129 | goto error; | |
130 | ||
131 | for_each_sg(obj->pages->sgl, sg, obj->pages->nents, i) | |
132 | pages[i] = sg_page(sg); | |
133 | ||
134 | obj->dma_buf_vmapping = vmap(pages, obj->pages->nents, 0, PAGE_KERNEL); | |
135 | drm_free_large(pages); | |
136 | ||
137 | if (!obj->dma_buf_vmapping) | |
138 | goto error; | |
9a70cc2a DA |
139 | |
140 | obj->vmapping_count = 1; | |
a5570178 | 141 | i915_gem_object_pin_pages(obj); |
9a70cc2a DA |
142 | out_unlock: |
143 | mutex_unlock(&dev->struct_mutex); | |
144 | return obj->dma_buf_vmapping; | |
9da3da66 CW |
145 | |
146 | error: | |
147 | mutex_unlock(&dev->struct_mutex); | |
148 | return ERR_PTR(ret); | |
9a70cc2a DA |
149 | } |
150 | ||
151 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
152 | { | |
153 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
154 | struct drm_device *dev = obj->base.dev; | |
155 | int ret; | |
156 | ||
157 | ret = i915_mutex_lock_interruptible(dev); | |
158 | if (ret) | |
159 | return; | |
160 | ||
a5570178 | 161 | if (--obj->vmapping_count == 0) { |
9a70cc2a DA |
162 | vunmap(obj->dma_buf_vmapping); |
163 | obj->dma_buf_vmapping = NULL; | |
a5570178 CW |
164 | |
165 | i915_gem_object_unpin_pages(obj); | |
9a70cc2a DA |
166 | } |
167 | mutex_unlock(&dev->struct_mutex); | |
168 | } | |
169 | ||
1286ff73 DV |
170 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
171 | { | |
172 | return NULL; | |
173 | } | |
174 | ||
175 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
176 | { | |
177 | ||
178 | } | |
179 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
180 | { | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
185 | { | |
186 | ||
187 | } | |
188 | ||
2dad9d4d DA |
189 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
190 | { | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
ec6f1bb9 DA |
194 | static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction) |
195 | { | |
196 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
197 | struct drm_device *dev = obj->base.dev; | |
198 | int ret; | |
199 | bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); | |
200 | ||
201 | ret = i915_mutex_lock_interruptible(dev); | |
202 | if (ret) | |
203 | return ret; | |
204 | ||
205 | ret = i915_gem_object_set_to_cpu_domain(obj, write); | |
206 | mutex_unlock(&dev->struct_mutex); | |
207 | return ret; | |
208 | } | |
209 | ||
6a101cb2 | 210 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
211 | .map_dma_buf = i915_gem_map_dma_buf, |
212 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
213 | .release = i915_gem_dmabuf_release, | |
214 | .kmap = i915_gem_dmabuf_kmap, | |
215 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, | |
216 | .kunmap = i915_gem_dmabuf_kunmap, | |
217 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, | |
2dad9d4d | 218 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
219 | .vmap = i915_gem_dmabuf_vmap, |
220 | .vunmap = i915_gem_dmabuf_vunmap, | |
ec6f1bb9 | 221 | .begin_cpu_access = i915_gem_begin_cpu_access, |
1286ff73 DV |
222 | }; |
223 | ||
224 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
9da3da66 | 225 | struct drm_gem_object *gem_obj, int flags) |
1286ff73 DV |
226 | { |
227 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); | |
228 | ||
5b42427f | 229 | return dma_buf_export(obj, &i915_dmabuf_ops, obj->base.size, flags); |
1286ff73 DV |
230 | } |
231 | ||
2f745ad3 CW |
232 | static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) |
233 | { | |
234 | struct sg_table *sg; | |
235 | ||
236 | sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL); | |
237 | if (IS_ERR(sg)) | |
238 | return PTR_ERR(sg); | |
239 | ||
240 | obj->pages = sg; | |
241 | obj->has_dma_mapping = true; | |
242 | return 0; | |
1286ff73 DV |
243 | } |
244 | ||
2f745ad3 CW |
245 | static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj) |
246 | { | |
247 | dma_buf_unmap_attachment(obj->base.import_attach, | |
248 | obj->pages, DMA_BIDIRECTIONAL); | |
249 | obj->has_dma_mapping = false; | |
250 | } | |
251 | ||
252 | static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { | |
253 | .get_pages = i915_gem_object_get_pages_dmabuf, | |
254 | .put_pages = i915_gem_object_put_pages_dmabuf, | |
255 | }; | |
256 | ||
1286ff73 | 257 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
9da3da66 | 258 | struct dma_buf *dma_buf) |
1286ff73 DV |
259 | { |
260 | struct dma_buf_attachment *attach; | |
1286ff73 | 261 | struct drm_i915_gem_object *obj; |
1286ff73 DV |
262 | int ret; |
263 | ||
264 | /* is this one of own objects? */ | |
265 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
266 | obj = dma_buf->priv; | |
267 | /* is it from our device? */ | |
268 | if (obj->base.dev == dev) { | |
be8a42ae SWK |
269 | /* |
270 | * Importing dmabuf exported from out own gem increases | |
271 | * refcount on gem itself instead of f_count of dmabuf. | |
272 | */ | |
1286ff73 | 273 | drm_gem_object_reference(&obj->base); |
be8a42ae | 274 | dma_buf_put(dma_buf); |
1286ff73 DV |
275 | return &obj->base; |
276 | } | |
277 | } | |
278 | ||
279 | /* need to attach */ | |
280 | attach = dma_buf_attach(dma_buf, dev->dev); | |
281 | if (IS_ERR(attach)) | |
282 | return ERR_CAST(attach); | |
283 | ||
42dcedd4 | 284 | obj = i915_gem_object_alloc(dev); |
1286ff73 DV |
285 | if (obj == NULL) { |
286 | ret = -ENOMEM; | |
2f745ad3 | 287 | goto fail_detach; |
1286ff73 DV |
288 | } |
289 | ||
9da3da66 | 290 | ret = drm_gem_private_object_init(dev, &obj->base, dma_buf->size); |
1286ff73 | 291 | if (ret) { |
42dcedd4 | 292 | i915_gem_object_free(obj); |
2f745ad3 | 293 | goto fail_detach; |
1286ff73 DV |
294 | } |
295 | ||
2f745ad3 | 296 | i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops); |
1286ff73 DV |
297 | obj->base.import_attach = attach; |
298 | ||
299 | return &obj->base; | |
300 | ||
1286ff73 DV |
301 | fail_detach: |
302 | dma_buf_detach(dma_buf, attach); | |
303 | return ERR_PTR(ret); | |
304 | } |