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++) { | |
67d5a50c | 65 | sg_set_page(dst, sg_page(src), src->length, 0); |
9da3da66 CW |
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; | |
67d5a50c | 108 | struct sg_page_iter sg_iter; |
9da3da66 CW |
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 | ||
67d5a50c | 127 | pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages)); |
9da3da66 CW |
128 | if (pages == NULL) |
129 | goto error; | |
130 | ||
67d5a50c | 131 | i = 0; |
b11b88ef | 132 | for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) |
2db76d7c | 133 | pages[i++] = sg_page_iter_page(&sg_iter); |
9da3da66 | 134 | |
67d5a50c | 135 | obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL); |
9da3da66 CW |
136 | drm_free_large(pages); |
137 | ||
138 | if (!obj->dma_buf_vmapping) | |
139 | goto error; | |
9a70cc2a DA |
140 | |
141 | obj->vmapping_count = 1; | |
a5570178 | 142 | i915_gem_object_pin_pages(obj); |
9a70cc2a DA |
143 | out_unlock: |
144 | mutex_unlock(&dev->struct_mutex); | |
145 | return obj->dma_buf_vmapping; | |
9da3da66 CW |
146 | |
147 | error: | |
148 | mutex_unlock(&dev->struct_mutex); | |
149 | return ERR_PTR(ret); | |
9a70cc2a DA |
150 | } |
151 | ||
152 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
153 | { | |
154 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
155 | struct drm_device *dev = obj->base.dev; | |
156 | int ret; | |
157 | ||
158 | ret = i915_mutex_lock_interruptible(dev); | |
159 | if (ret) | |
160 | return; | |
161 | ||
a5570178 | 162 | if (--obj->vmapping_count == 0) { |
9a70cc2a DA |
163 | vunmap(obj->dma_buf_vmapping); |
164 | obj->dma_buf_vmapping = NULL; | |
a5570178 CW |
165 | |
166 | i915_gem_object_unpin_pages(obj); | |
9a70cc2a DA |
167 | } |
168 | mutex_unlock(&dev->struct_mutex); | |
169 | } | |
170 | ||
1286ff73 DV |
171 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
172 | { | |
173 | return NULL; | |
174 | } | |
175 | ||
176 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
177 | { | |
178 | ||
179 | } | |
180 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
181 | { | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
186 | { | |
187 | ||
188 | } | |
189 | ||
2dad9d4d DA |
190 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
191 | { | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
ec6f1bb9 DA |
195 | static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction) |
196 | { | |
197 | struct drm_i915_gem_object *obj = dma_buf->priv; | |
198 | struct drm_device *dev = obj->base.dev; | |
199 | int ret; | |
200 | bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); | |
201 | ||
202 | ret = i915_mutex_lock_interruptible(dev); | |
203 | if (ret) | |
204 | return ret; | |
205 | ||
206 | ret = i915_gem_object_set_to_cpu_domain(obj, write); | |
207 | mutex_unlock(&dev->struct_mutex); | |
208 | return ret; | |
209 | } | |
210 | ||
6a101cb2 | 211 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
212 | .map_dma_buf = i915_gem_map_dma_buf, |
213 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
214 | .release = i915_gem_dmabuf_release, | |
215 | .kmap = i915_gem_dmabuf_kmap, | |
216 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, | |
217 | .kunmap = i915_gem_dmabuf_kunmap, | |
218 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, | |
2dad9d4d | 219 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
220 | .vmap = i915_gem_dmabuf_vmap, |
221 | .vunmap = i915_gem_dmabuf_vunmap, | |
ec6f1bb9 | 222 | .begin_cpu_access = i915_gem_begin_cpu_access, |
1286ff73 DV |
223 | }; |
224 | ||
225 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
9da3da66 | 226 | struct drm_gem_object *gem_obj, int flags) |
1286ff73 DV |
227 | { |
228 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); | |
229 | ||
5b42427f | 230 | return dma_buf_export(obj, &i915_dmabuf_ops, obj->base.size, flags); |
1286ff73 DV |
231 | } |
232 | ||
2f745ad3 CW |
233 | static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) |
234 | { | |
235 | struct sg_table *sg; | |
236 | ||
237 | sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL); | |
238 | if (IS_ERR(sg)) | |
239 | return PTR_ERR(sg); | |
240 | ||
241 | obj->pages = sg; | |
242 | obj->has_dma_mapping = true; | |
243 | return 0; | |
1286ff73 DV |
244 | } |
245 | ||
2f745ad3 CW |
246 | static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj) |
247 | { | |
248 | dma_buf_unmap_attachment(obj->base.import_attach, | |
249 | obj->pages, DMA_BIDIRECTIONAL); | |
250 | obj->has_dma_mapping = false; | |
251 | } | |
252 | ||
253 | static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { | |
254 | .get_pages = i915_gem_object_get_pages_dmabuf, | |
255 | .put_pages = i915_gem_object_put_pages_dmabuf, | |
256 | }; | |
257 | ||
1286ff73 | 258 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
9da3da66 | 259 | struct dma_buf *dma_buf) |
1286ff73 DV |
260 | { |
261 | struct dma_buf_attachment *attach; | |
1286ff73 | 262 | struct drm_i915_gem_object *obj; |
1286ff73 DV |
263 | int ret; |
264 | ||
265 | /* is this one of own objects? */ | |
266 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
267 | obj = dma_buf->priv; | |
268 | /* is it from our device? */ | |
269 | if (obj->base.dev == dev) { | |
be8a42ae SWK |
270 | /* |
271 | * Importing dmabuf exported from out own gem increases | |
272 | * refcount on gem itself instead of f_count of dmabuf. | |
273 | */ | |
1286ff73 DV |
274 | drm_gem_object_reference(&obj->base); |
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 | ||
011c2282 ID |
284 | get_dma_buf(dma_buf); |
285 | ||
42dcedd4 | 286 | obj = i915_gem_object_alloc(dev); |
1286ff73 DV |
287 | if (obj == NULL) { |
288 | ret = -ENOMEM; | |
2f745ad3 | 289 | goto fail_detach; |
1286ff73 DV |
290 | } |
291 | ||
89c8233f | 292 | drm_gem_private_object_init(dev, &obj->base, dma_buf->size); |
2f745ad3 | 293 | i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops); |
1286ff73 DV |
294 | obj->base.import_attach = attach; |
295 | ||
296 | return &obj->base; | |
297 | ||
1286ff73 DV |
298 | fail_detach: |
299 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
300 | dma_buf_put(dma_buf); |
301 | ||
1286ff73 DV |
302 | return ERR_PTR(ret); |
303 | } |