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 | ||
608806a5 DV |
30 | static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf) |
31 | { | |
32 | return to_intel_bo(buf->priv); | |
33 | } | |
34 | ||
6a101cb2 | 35 | static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
9da3da66 | 36 | enum dma_data_direction dir) |
1286ff73 | 37 | { |
608806a5 | 38 | struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
9da3da66 CW |
39 | struct sg_table *st; |
40 | struct scatterlist *src, *dst; | |
41 | int ret, i; | |
1286ff73 | 42 | |
9da3da66 | 43 | ret = i915_mutex_lock_interruptible(obj->base.dev); |
1286ff73 | 44 | if (ret) |
5cfacded | 45 | goto err; |
1286ff73 | 46 | |
37e680a1 | 47 | ret = i915_gem_object_get_pages(obj); |
5cfacded CW |
48 | if (ret) |
49 | goto err_unlock; | |
50 | ||
51 | i915_gem_object_pin_pages(obj); | |
9da3da66 CW |
52 | |
53 | /* Copy sg so that we make an independent mapping */ | |
54 | st = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
55 | if (st == NULL) { | |
5cfacded CW |
56 | ret = -ENOMEM; |
57 | goto err_unpin; | |
1286ff73 DV |
58 | } |
59 | ||
9da3da66 | 60 | ret = sg_alloc_table(st, obj->pages->nents, GFP_KERNEL); |
5cfacded CW |
61 | if (ret) |
62 | goto err_free; | |
9da3da66 CW |
63 | |
64 | src = obj->pages->sgl; | |
65 | dst = st->sgl; | |
66 | for (i = 0; i < obj->pages->nents; i++) { | |
67d5a50c | 67 | sg_set_page(dst, sg_page(src), src->length, 0); |
9da3da66 CW |
68 | dst = sg_next(dst); |
69 | src = sg_next(src); | |
70 | } | |
71 | ||
72 | if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { | |
5cfacded CW |
73 | ret =-ENOMEM; |
74 | goto err_free_sg; | |
1286ff73 DV |
75 | } |
76 | ||
9da3da66 CW |
77 | mutex_unlock(&obj->base.dev->struct_mutex); |
78 | return st; | |
5cfacded CW |
79 | |
80 | err_free_sg: | |
81 | sg_free_table(st); | |
82 | err_free: | |
83 | kfree(st); | |
84 | err_unpin: | |
85 | i915_gem_object_unpin_pages(obj); | |
86 | err_unlock: | |
87 | mutex_unlock(&obj->base.dev->struct_mutex); | |
88 | err: | |
89 | return ERR_PTR(ret); | |
1286ff73 DV |
90 | } |
91 | ||
6a101cb2 | 92 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
2f745ad3 CW |
93 | struct sg_table *sg, |
94 | enum dma_data_direction dir) | |
1286ff73 | 95 | { |
608806a5 | 96 | struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
f214266c DV |
97 | |
98 | mutex_lock(&obj->base.dev->struct_mutex); | |
99 | ||
1286ff73 DV |
100 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
101 | sg_free_table(sg); | |
102 | kfree(sg); | |
f214266c DV |
103 | |
104 | i915_gem_object_unpin_pages(obj); | |
105 | ||
106 | mutex_unlock(&obj->base.dev->struct_mutex); | |
1286ff73 DV |
107 | } |
108 | ||
9a70cc2a DA |
109 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
110 | { | |
608806a5 | 111 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
9a70cc2a | 112 | struct drm_device *dev = obj->base.dev; |
67d5a50c | 113 | struct sg_page_iter sg_iter; |
9da3da66 CW |
114 | struct page **pages; |
115 | int ret, i; | |
9a70cc2a DA |
116 | |
117 | ret = i915_mutex_lock_interruptible(dev); | |
118 | if (ret) | |
119 | return ERR_PTR(ret); | |
120 | ||
121 | if (obj->dma_buf_vmapping) { | |
122 | obj->vmapping_count++; | |
123 | goto out_unlock; | |
124 | } | |
125 | ||
37e680a1 | 126 | ret = i915_gem_object_get_pages(obj); |
9da3da66 CW |
127 | if (ret) |
128 | goto error; | |
9a70cc2a | 129 | |
9da3da66 CW |
130 | ret = -ENOMEM; |
131 | ||
67d5a50c | 132 | pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages)); |
9da3da66 CW |
133 | if (pages == NULL) |
134 | goto error; | |
135 | ||
67d5a50c | 136 | i = 0; |
b11b88ef | 137 | for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) |
2db76d7c | 138 | pages[i++] = sg_page_iter_page(&sg_iter); |
9da3da66 | 139 | |
67d5a50c | 140 | obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL); |
9da3da66 CW |
141 | drm_free_large(pages); |
142 | ||
143 | if (!obj->dma_buf_vmapping) | |
144 | goto error; | |
9a70cc2a DA |
145 | |
146 | obj->vmapping_count = 1; | |
a5570178 | 147 | i915_gem_object_pin_pages(obj); |
9a70cc2a DA |
148 | out_unlock: |
149 | mutex_unlock(&dev->struct_mutex); | |
150 | return obj->dma_buf_vmapping; | |
9da3da66 CW |
151 | |
152 | error: | |
153 | mutex_unlock(&dev->struct_mutex); | |
154 | return ERR_PTR(ret); | |
9a70cc2a DA |
155 | } |
156 | ||
157 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
158 | { | |
608806a5 | 159 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
9a70cc2a DA |
160 | struct drm_device *dev = obj->base.dev; |
161 | int ret; | |
162 | ||
163 | ret = i915_mutex_lock_interruptible(dev); | |
164 | if (ret) | |
165 | return; | |
166 | ||
a5570178 | 167 | if (--obj->vmapping_count == 0) { |
9a70cc2a DA |
168 | vunmap(obj->dma_buf_vmapping); |
169 | obj->dma_buf_vmapping = NULL; | |
a5570178 CW |
170 | |
171 | i915_gem_object_unpin_pages(obj); | |
9a70cc2a DA |
172 | } |
173 | mutex_unlock(&dev->struct_mutex); | |
174 | } | |
175 | ||
1286ff73 DV |
176 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
177 | { | |
178 | return NULL; | |
179 | } | |
180 | ||
181 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
182 | { | |
183 | ||
184 | } | |
185 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
186 | { | |
187 | return NULL; | |
188 | } | |
189 | ||
190 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
191 | { | |
192 | ||
193 | } | |
194 | ||
2dad9d4d DA |
195 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
196 | { | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
ec6f1bb9 DA |
200 | static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction) |
201 | { | |
608806a5 | 202 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
ec6f1bb9 DA |
203 | struct drm_device *dev = obj->base.dev; |
204 | int ret; | |
205 | bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); | |
206 | ||
207 | ret = i915_mutex_lock_interruptible(dev); | |
208 | if (ret) | |
209 | return ret; | |
210 | ||
211 | ret = i915_gem_object_set_to_cpu_domain(obj, write); | |
212 | mutex_unlock(&dev->struct_mutex); | |
213 | return ret; | |
214 | } | |
215 | ||
6a101cb2 | 216 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
217 | .map_dma_buf = i915_gem_map_dma_buf, |
218 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
c1d6798d | 219 | .release = drm_gem_dmabuf_release, |
1286ff73 DV |
220 | .kmap = i915_gem_dmabuf_kmap, |
221 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, | |
222 | .kunmap = i915_gem_dmabuf_kunmap, | |
223 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, | |
2dad9d4d | 224 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
225 | .vmap = i915_gem_dmabuf_vmap, |
226 | .vunmap = i915_gem_dmabuf_vunmap, | |
ec6f1bb9 | 227 | .begin_cpu_access = i915_gem_begin_cpu_access, |
1286ff73 DV |
228 | }; |
229 | ||
230 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
9da3da66 | 231 | struct drm_gem_object *gem_obj, int flags) |
1286ff73 | 232 | { |
608806a5 | 233 | return dma_buf_export(gem_obj, &i915_dmabuf_ops, gem_obj->size, flags); |
1286ff73 DV |
234 | } |
235 | ||
2f745ad3 CW |
236 | static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) |
237 | { | |
238 | struct sg_table *sg; | |
239 | ||
240 | sg = dma_buf_map_attachment(obj->base.import_attach, DMA_BIDIRECTIONAL); | |
241 | if (IS_ERR(sg)) | |
242 | return PTR_ERR(sg); | |
243 | ||
244 | obj->pages = sg; | |
245 | obj->has_dma_mapping = true; | |
246 | return 0; | |
1286ff73 DV |
247 | } |
248 | ||
2f745ad3 CW |
249 | static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj) |
250 | { | |
251 | dma_buf_unmap_attachment(obj->base.import_attach, | |
252 | obj->pages, DMA_BIDIRECTIONAL); | |
253 | obj->has_dma_mapping = false; | |
254 | } | |
255 | ||
256 | static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { | |
257 | .get_pages = i915_gem_object_get_pages_dmabuf, | |
258 | .put_pages = i915_gem_object_put_pages_dmabuf, | |
259 | }; | |
260 | ||
1286ff73 | 261 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
9da3da66 | 262 | struct dma_buf *dma_buf) |
1286ff73 DV |
263 | { |
264 | struct dma_buf_attachment *attach; | |
1286ff73 | 265 | struct drm_i915_gem_object *obj; |
1286ff73 DV |
266 | int ret; |
267 | ||
268 | /* is this one of own objects? */ | |
269 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
608806a5 | 270 | obj = dma_buf_to_obj(dma_buf); |
1286ff73 DV |
271 | /* is it from our device? */ |
272 | if (obj->base.dev == dev) { | |
be8a42ae SWK |
273 | /* |
274 | * Importing dmabuf exported from out own gem increases | |
275 | * refcount on gem itself instead of f_count of dmabuf. | |
276 | */ | |
1286ff73 DV |
277 | drm_gem_object_reference(&obj->base); |
278 | return &obj->base; | |
279 | } | |
280 | } | |
281 | ||
282 | /* need to attach */ | |
283 | attach = dma_buf_attach(dma_buf, dev->dev); | |
284 | if (IS_ERR(attach)) | |
285 | return ERR_CAST(attach); | |
286 | ||
011c2282 ID |
287 | get_dma_buf(dma_buf); |
288 | ||
42dcedd4 | 289 | obj = i915_gem_object_alloc(dev); |
1286ff73 DV |
290 | if (obj == NULL) { |
291 | ret = -ENOMEM; | |
2f745ad3 | 292 | goto fail_detach; |
1286ff73 DV |
293 | } |
294 | ||
89c8233f | 295 | drm_gem_private_object_init(dev, &obj->base, dma_buf->size); |
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); | |
011c2282 ID |
303 | dma_buf_put(dma_buf); |
304 | ||
1286ff73 DV |
305 | return ERR_PTR(ret); |
306 | } |