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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 | */ | |
ad778f89 CW |
26 | |
27 | #include <linux/dma-buf.h> | |
28 | #include <linux/reservation.h> | |
29 | ||
760285e7 | 30 | #include <drm/drmP.h> |
ad778f89 | 31 | |
1286ff73 | 32 | #include "i915_drv.h" |
1286ff73 | 33 | |
608806a5 DV |
34 | static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf) |
35 | { | |
36 | return to_intel_bo(buf->priv); | |
37 | } | |
38 | ||
6a101cb2 | 39 | static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
9da3da66 | 40 | enum dma_data_direction dir) |
1286ff73 | 41 | { |
608806a5 | 42 | struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
9da3da66 CW |
43 | struct sg_table *st; |
44 | struct scatterlist *src, *dst; | |
45 | int ret, i; | |
1286ff73 | 46 | |
a4f5ea64 | 47 | ret = i915_gem_object_pin_pages(obj); |
5cfacded | 48 | if (ret) |
7dd737f3 | 49 | goto err; |
5cfacded | 50 | |
9da3da66 CW |
51 | /* Copy sg so that we make an independent mapping */ |
52 | st = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
53 | if (st == NULL) { | |
5cfacded | 54 | ret = -ENOMEM; |
7dd737f3 | 55 | goto err_unpin_pages; |
1286ff73 DV |
56 | } |
57 | ||
a4f5ea64 | 58 | ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL); |
5cfacded CW |
59 | if (ret) |
60 | goto err_free; | |
9da3da66 | 61 | |
a4f5ea64 | 62 | src = obj->mm.pages->sgl; |
9da3da66 | 63 | dst = st->sgl; |
a4f5ea64 | 64 | for (i = 0; i < obj->mm.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)) { | |
7dd737f3 | 71 | ret = -ENOMEM; |
5cfacded | 72 | goto err_free_sg; |
1286ff73 DV |
73 | } |
74 | ||
9da3da66 | 75 | return st; |
5cfacded CW |
76 | |
77 | err_free_sg: | |
78 | sg_free_table(st); | |
79 | err_free: | |
80 | kfree(st); | |
7dd737f3 | 81 | err_unpin_pages: |
5cfacded | 82 | i915_gem_object_unpin_pages(obj); |
5cfacded CW |
83 | err: |
84 | return ERR_PTR(ret); | |
1286ff73 DV |
85 | } |
86 | ||
6a101cb2 | 87 | static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
2f745ad3 CW |
88 | struct sg_table *sg, |
89 | enum dma_data_direction dir) | |
1286ff73 | 90 | { |
608806a5 | 91 | struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); |
f214266c | 92 | |
1286ff73 DV |
93 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
94 | sg_free_table(sg); | |
95 | kfree(sg); | |
f214266c DV |
96 | |
97 | i915_gem_object_unpin_pages(obj); | |
1286ff73 DV |
98 | } |
99 | ||
9a70cc2a DA |
100 | static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
101 | { | |
608806a5 | 102 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
9a70cc2a | 103 | |
7dd737f3 | 104 | return i915_gem_object_pin_map(obj, I915_MAP_WB); |
9a70cc2a DA |
105 | } |
106 | ||
107 | static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
108 | { | |
608806a5 | 109 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
9a70cc2a | 110 | |
0a798eb9 | 111 | i915_gem_object_unpin_map(obj); |
9a70cc2a DA |
112 | } |
113 | ||
1286ff73 DV |
114 | static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
115 | { | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
120 | { | |
121 | ||
122 | } | |
123 | static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) | |
124 | { | |
125 | return NULL; | |
126 | } | |
127 | ||
128 | static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) | |
129 | { | |
130 | ||
131 | } | |
132 | ||
2dad9d4d DA |
133 | static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
134 | { | |
2dbf0d90 TV |
135 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
136 | int ret; | |
137 | ||
138 | if (obj->base.size < vma->vm_end - vma->vm_start) | |
139 | return -EINVAL; | |
140 | ||
141 | if (!obj->base.filp) | |
142 | return -ENODEV; | |
143 | ||
144 | ret = obj->base.filp->f_op->mmap(obj->base.filp, vma); | |
145 | if (ret) | |
146 | return ret; | |
147 | ||
148 | fput(vma->vm_file); | |
149 | vma->vm_file = get_file(obj->base.filp); | |
150 | ||
151 | return 0; | |
2dad9d4d DA |
152 | } |
153 | ||
831e9da7 | 154 | static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) |
ec6f1bb9 | 155 | { |
608806a5 | 156 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); |
ec6f1bb9 | 157 | struct drm_device *dev = obj->base.dev; |
ec6f1bb9 | 158 | bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); |
7dd737f3 | 159 | int err; |
ec6f1bb9 | 160 | |
7dd737f3 CW |
161 | err = i915_gem_object_pin_pages(obj); |
162 | if (err) | |
163 | return err; | |
164 | ||
165 | err = i915_mutex_lock_interruptible(dev); | |
166 | if (err) | |
167 | goto out; | |
ec6f1bb9 | 168 | |
7dd737f3 | 169 | err = i915_gem_object_set_to_cpu_domain(obj, write); |
ec6f1bb9 | 170 | mutex_unlock(&dev->struct_mutex); |
7dd737f3 CW |
171 | |
172 | out: | |
173 | i915_gem_object_unpin_pages(obj); | |
174 | return err; | |
ec6f1bb9 DA |
175 | } |
176 | ||
18b862dc | 177 | static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) |
346400c8 TV |
178 | { |
179 | struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); | |
180 | struct drm_device *dev = obj->base.dev; | |
7dd737f3 | 181 | int err; |
346400c8 | 182 | |
7dd737f3 CW |
183 | err = i915_gem_object_pin_pages(obj); |
184 | if (err) | |
185 | return err; | |
186 | ||
187 | err = i915_mutex_lock_interruptible(dev); | |
188 | if (err) | |
189 | goto out; | |
346400c8 | 190 | |
7dd737f3 | 191 | err = i915_gem_object_set_to_gtt_domain(obj, false); |
346400c8 TV |
192 | mutex_unlock(&dev->struct_mutex); |
193 | ||
7dd737f3 CW |
194 | out: |
195 | i915_gem_object_unpin_pages(obj); | |
196 | return err; | |
346400c8 TV |
197 | } |
198 | ||
6a101cb2 | 199 | static const struct dma_buf_ops i915_dmabuf_ops = { |
1286ff73 DV |
200 | .map_dma_buf = i915_gem_map_dma_buf, |
201 | .unmap_dma_buf = i915_gem_unmap_dma_buf, | |
c1d6798d | 202 | .release = drm_gem_dmabuf_release, |
1286ff73 DV |
203 | .kmap = i915_gem_dmabuf_kmap, |
204 | .kmap_atomic = i915_gem_dmabuf_kmap_atomic, | |
205 | .kunmap = i915_gem_dmabuf_kunmap, | |
206 | .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic, | |
2dad9d4d | 207 | .mmap = i915_gem_dmabuf_mmap, |
9a70cc2a DA |
208 | .vmap = i915_gem_dmabuf_vmap, |
209 | .vunmap = i915_gem_dmabuf_vunmap, | |
ec6f1bb9 | 210 | .begin_cpu_access = i915_gem_begin_cpu_access, |
346400c8 | 211 | .end_cpu_access = i915_gem_end_cpu_access, |
1286ff73 DV |
212 | }; |
213 | ||
214 | struct dma_buf *i915_gem_prime_export(struct drm_device *dev, | |
9da3da66 | 215 | struct drm_gem_object *gem_obj, int flags) |
1286ff73 | 216 | { |
5cc9ed4b | 217 | struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); |
d8fbe341 SS |
218 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
219 | ||
220 | exp_info.ops = &i915_dmabuf_ops; | |
221 | exp_info.size = gem_obj->size; | |
222 | exp_info.flags = flags; | |
223 | exp_info.priv = gem_obj; | |
d07f0e59 | 224 | exp_info.resv = obj->resv; |
d8fbe341 | 225 | |
5cc9ed4b CW |
226 | if (obj->ops->dmabuf_export) { |
227 | int ret = obj->ops->dmabuf_export(obj); | |
228 | if (ret) | |
229 | return ERR_PTR(ret); | |
230 | } | |
231 | ||
d07f0e59 | 232 | return drm_gem_dmabuf_export(dev, &exp_info); |
1286ff73 DV |
233 | } |
234 | ||
03ac84f1 CW |
235 | static struct sg_table * |
236 | i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) | |
2f745ad3 | 237 | { |
03ac84f1 CW |
238 | return dma_buf_map_attachment(obj->base.import_attach, |
239 | DMA_BIDIRECTIONAL); | |
1286ff73 DV |
240 | } |
241 | ||
03ac84f1 CW |
242 | static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj, |
243 | struct sg_table *pages) | |
2f745ad3 | 244 | { |
03ac84f1 CW |
245 | dma_buf_unmap_attachment(obj->base.import_attach, pages, |
246 | DMA_BIDIRECTIONAL); | |
2f745ad3 CW |
247 | } |
248 | ||
249 | static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { | |
250 | .get_pages = i915_gem_object_get_pages_dmabuf, | |
251 | .put_pages = i915_gem_object_put_pages_dmabuf, | |
252 | }; | |
253 | ||
1286ff73 | 254 | struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, |
9da3da66 | 255 | struct dma_buf *dma_buf) |
1286ff73 DV |
256 | { |
257 | struct dma_buf_attachment *attach; | |
1286ff73 | 258 | struct drm_i915_gem_object *obj; |
1286ff73 DV |
259 | int ret; |
260 | ||
261 | /* is this one of own objects? */ | |
262 | if (dma_buf->ops == &i915_dmabuf_ops) { | |
608806a5 | 263 | obj = dma_buf_to_obj(dma_buf); |
1286ff73 DV |
264 | /* is it from our device? */ |
265 | if (obj->base.dev == dev) { | |
be8a42ae SWK |
266 | /* |
267 | * Importing dmabuf exported from out own gem increases | |
268 | * refcount on gem itself instead of f_count of dmabuf. | |
269 | */ | |
25dc556a | 270 | return &i915_gem_object_get(obj)->base; |
1286ff73 DV |
271 | } |
272 | } | |
273 | ||
274 | /* need to attach */ | |
275 | attach = dma_buf_attach(dma_buf, dev->dev); | |
276 | if (IS_ERR(attach)) | |
277 | return ERR_CAST(attach); | |
278 | ||
011c2282 ID |
279 | get_dma_buf(dma_buf); |
280 | ||
42dcedd4 | 281 | obj = i915_gem_object_alloc(dev); |
1286ff73 DV |
282 | if (obj == NULL) { |
283 | ret = -ENOMEM; | |
2f745ad3 | 284 | goto fail_detach; |
1286ff73 DV |
285 | } |
286 | ||
89c8233f | 287 | drm_gem_private_object_init(dev, &obj->base, dma_buf->size); |
2f745ad3 | 288 | i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops); |
1286ff73 | 289 | obj->base.import_attach = attach; |
d07f0e59 | 290 | obj->resv = dma_buf->resv; |
1286ff73 | 291 | |
30bc06c0 CW |
292 | /* We use GTT as shorthand for a coherent domain, one that is |
293 | * neither in the GPU cache nor in the CPU cache, where all | |
294 | * writes are immediately visible in memory. (That's not strictly | |
295 | * true, but it's close! There are internal buffers such as the | |
296 | * write-combined buffer or a delay through the chipset for GTT | |
297 | * writes that do require us to treat GTT as a separate cache domain.) | |
298 | */ | |
299 | obj->base.read_domains = I915_GEM_DOMAIN_GTT; | |
300 | obj->base.write_domain = 0; | |
301 | ||
1286ff73 DV |
302 | return &obj->base; |
303 | ||
1286ff73 DV |
304 | fail_detach: |
305 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
306 | dma_buf_put(dma_buf); |
307 | ||
1286ff73 DV |
308 | return ERR_PTR(ret); |
309 | } |