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3248877e DA |
1 | /* |
2 | * Copyright © 2012 Red Hat | |
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 DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | * | |
23 | * Authors: | |
24 | * Dave Airlie <airlied@redhat.com> | |
25 | * Rob Clark <rob.clark@linaro.org> | |
26 | * | |
27 | */ | |
28 | ||
29 | #include <linux/export.h> | |
30 | #include <linux/dma-buf.h> | |
760285e7 | 31 | #include <drm/drmP.h> |
3248877e DA |
32 | |
33 | /* | |
34 | * DMA-BUF/GEM Object references and lifetime overview: | |
35 | * | |
36 | * On the export the dma_buf holds a reference to the exporting GEM | |
37 | * object. It takes this reference in handle_to_fd_ioctl, when it | |
38 | * first calls .prime_export and stores the exporting GEM object in | |
39 | * the dma_buf priv. This reference is released when the dma_buf | |
40 | * object goes away in the driver .release function. | |
41 | * | |
42 | * On the import the importing GEM object holds a reference to the | |
43 | * dma_buf (which in turn holds a ref to the exporting GEM object). | |
44 | * It takes that reference in the fd_to_handle ioctl. | |
45 | * It calls dma_buf_get, creates an attachment to it and stores the | |
46 | * attachment in the GEM object. When this attachment is destroyed | |
47 | * when the imported object is destroyed, we remove the attachment | |
48 | * and drop the reference to the dma_buf. | |
49 | * | |
50 | * Thus the chain of references always flows in one direction | |
51 | * (avoiding loops): importing_gem -> dmabuf -> exporting_gem | |
52 | * | |
53 | * Self-importing: if userspace is using PRIME as a replacement for flink | |
54 | * then it will get a fd->handle request for a GEM object that it created. | |
55 | * Drivers should detect this situation and return back the gem object | |
89177644 AP |
56 | * from the dma-buf private. Prime will do this automatically for drivers that |
57 | * use the drm_gem_prime_{import,export} helpers. | |
3248877e DA |
58 | */ |
59 | ||
60 | struct drm_prime_member { | |
61 | struct list_head entry; | |
62 | struct dma_buf *dma_buf; | |
63 | uint32_t handle; | |
64 | }; | |
538d6661 JS |
65 | |
66 | struct drm_prime_attachment { | |
67 | struct sg_table *sgt; | |
68 | enum dma_data_direction dir; | |
69 | }; | |
70 | ||
ce92e3c9 SWK |
71 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle) |
72 | { | |
73 | struct drm_prime_member *member; | |
74 | ||
75 | member = kmalloc(sizeof(*member), GFP_KERNEL); | |
76 | if (!member) | |
77 | return -ENOMEM; | |
78 | ||
79 | get_dma_buf(dma_buf); | |
80 | member->dma_buf = dma_buf; | |
81 | member->handle = handle; | |
82 | list_add(&member->entry, &prime_fpriv->head); | |
83 | return 0; | |
84 | } | |
3248877e | 85 | |
d0b2c533 DV |
86 | static struct dma_buf *drm_prime_lookup_buf_by_handle(struct drm_prime_file_private *prime_fpriv, |
87 | uint32_t handle) | |
88 | { | |
89 | struct drm_prime_member *member; | |
90 | ||
91 | list_for_each_entry(member, &prime_fpriv->head, entry) { | |
92 | if (member->handle == handle) | |
93 | return member->dma_buf; | |
94 | } | |
95 | ||
96 | return NULL; | |
97 | } | |
98 | ||
de9564d8 DV |
99 | static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, |
100 | struct dma_buf *dma_buf, | |
101 | uint32_t *handle) | |
102 | { | |
103 | struct drm_prime_member *member; | |
104 | ||
105 | list_for_each_entry(member, &prime_fpriv->head, entry) { | |
106 | if (member->dma_buf == dma_buf) { | |
107 | *handle = member->handle; | |
108 | return 0; | |
109 | } | |
110 | } | |
111 | return -ENOENT; | |
112 | } | |
113 | ||
ca793f75 ML |
114 | static int drm_gem_map_attach(struct dma_buf *dma_buf, |
115 | struct device *target_dev, | |
116 | struct dma_buf_attachment *attach) | |
117 | { | |
538d6661 | 118 | struct drm_prime_attachment *prime_attach; |
ca793f75 ML |
119 | struct drm_gem_object *obj = dma_buf->priv; |
120 | struct drm_device *dev = obj->dev; | |
121 | ||
538d6661 JS |
122 | prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL); |
123 | if (!prime_attach) | |
124 | return -ENOMEM; | |
125 | ||
126 | prime_attach->dir = DMA_NONE; | |
127 | attach->priv = prime_attach; | |
128 | ||
ca793f75 ML |
129 | if (!dev->driver->gem_prime_pin) |
130 | return 0; | |
131 | ||
132 | return dev->driver->gem_prime_pin(obj); | |
133 | } | |
134 | ||
135 | static void drm_gem_map_detach(struct dma_buf *dma_buf, | |
136 | struct dma_buf_attachment *attach) | |
137 | { | |
538d6661 | 138 | struct drm_prime_attachment *prime_attach = attach->priv; |
ca793f75 ML |
139 | struct drm_gem_object *obj = dma_buf->priv; |
140 | struct drm_device *dev = obj->dev; | |
538d6661 | 141 | struct sg_table *sgt; |
ca793f75 ML |
142 | |
143 | if (dev->driver->gem_prime_unpin) | |
144 | dev->driver->gem_prime_unpin(obj); | |
538d6661 JS |
145 | |
146 | if (!prime_attach) | |
147 | return; | |
148 | ||
149 | sgt = prime_attach->sgt; | |
f9d8a129 JS |
150 | if (sgt) { |
151 | if (prime_attach->dir != DMA_NONE) | |
152 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, | |
153 | prime_attach->dir); | |
154 | sg_free_table(sgt); | |
155 | } | |
538d6661 | 156 | |
538d6661 JS |
157 | kfree(sgt); |
158 | kfree(prime_attach); | |
159 | attach->priv = NULL; | |
ca793f75 ML |
160 | } |
161 | ||
d0b2c533 DV |
162 | void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, |
163 | struct dma_buf *dma_buf) | |
da34242e YC |
164 | { |
165 | struct drm_prime_member *member, *safe; | |
166 | ||
167 | list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) { | |
168 | if (member->dma_buf == dma_buf) { | |
169 | dma_buf_put(dma_buf); | |
170 | list_del(&member->entry); | |
171 | kfree(member); | |
172 | } | |
173 | } | |
174 | } | |
175 | ||
89177644 AP |
176 | static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
177 | enum dma_data_direction dir) | |
178 | { | |
538d6661 | 179 | struct drm_prime_attachment *prime_attach = attach->priv; |
89177644 AP |
180 | struct drm_gem_object *obj = attach->dmabuf->priv; |
181 | struct sg_table *sgt; | |
182 | ||
538d6661 JS |
183 | if (WARN_ON(dir == DMA_NONE || !prime_attach)) |
184 | return ERR_PTR(-EINVAL); | |
185 | ||
186 | /* return the cached mapping when possible */ | |
187 | if (prime_attach->dir == dir) | |
188 | return prime_attach->sgt; | |
189 | ||
190 | /* | |
191 | * two mappings with different directions for the same attachment are | |
192 | * not allowed | |
193 | */ | |
194 | if (WARN_ON(prime_attach->dir != DMA_NONE)) | |
195 | return ERR_PTR(-EBUSY); | |
196 | ||
89177644 AP |
197 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); |
198 | ||
7e3d88f9 | 199 | if (!IS_ERR(sgt)) { |
b720d54a YC |
200 | if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) { |
201 | sg_free_table(sgt); | |
202 | kfree(sgt); | |
203 | sgt = ERR_PTR(-ENOMEM); | |
538d6661 JS |
204 | } else { |
205 | prime_attach->sgt = sgt; | |
206 | prime_attach->dir = dir; | |
b720d54a YC |
207 | } |
208 | } | |
89177644 | 209 | |
89177644 AP |
210 | return sgt; |
211 | } | |
212 | ||
213 | static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, | |
214 | struct sg_table *sgt, enum dma_data_direction dir) | |
215 | { | |
538d6661 | 216 | /* nothing to be done here */ |
89177644 AP |
217 | } |
218 | ||
c1d6798d | 219 | void drm_gem_dmabuf_release(struct dma_buf *dma_buf) |
89177644 AP |
220 | { |
221 | struct drm_gem_object *obj = dma_buf->priv; | |
222 | ||
319c933c DV |
223 | /* drop the reference on the export fd holds */ |
224 | drm_gem_object_unreference_unlocked(obj); | |
89177644 | 225 | } |
c1d6798d | 226 | EXPORT_SYMBOL(drm_gem_dmabuf_release); |
89177644 AP |
227 | |
228 | static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) | |
229 | { | |
230 | struct drm_gem_object *obj = dma_buf->priv; | |
231 | struct drm_device *dev = obj->dev; | |
232 | ||
233 | return dev->driver->gem_prime_vmap(obj); | |
234 | } | |
235 | ||
236 | static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
237 | { | |
238 | struct drm_gem_object *obj = dma_buf->priv; | |
239 | struct drm_device *dev = obj->dev; | |
240 | ||
241 | dev->driver->gem_prime_vunmap(obj, vaddr); | |
242 | } | |
243 | ||
244 | static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, | |
245 | unsigned long page_num) | |
246 | { | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, | |
251 | unsigned long page_num, void *addr) | |
252 | { | |
253 | ||
254 | } | |
255 | static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, | |
256 | unsigned long page_num) | |
257 | { | |
258 | return NULL; | |
259 | } | |
260 | ||
261 | static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, | |
262 | unsigned long page_num, void *addr) | |
263 | { | |
264 | ||
265 | } | |
266 | ||
267 | static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, | |
268 | struct vm_area_struct *vma) | |
269 | { | |
7c397cd9 JS |
270 | struct drm_gem_object *obj = dma_buf->priv; |
271 | struct drm_device *dev = obj->dev; | |
272 | ||
273 | if (!dev->driver->gem_prime_mmap) | |
274 | return -ENOSYS; | |
275 | ||
276 | return dev->driver->gem_prime_mmap(obj, vma); | |
89177644 AP |
277 | } |
278 | ||
279 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { | |
ca793f75 ML |
280 | .attach = drm_gem_map_attach, |
281 | .detach = drm_gem_map_detach, | |
89177644 AP |
282 | .map_dma_buf = drm_gem_map_dma_buf, |
283 | .unmap_dma_buf = drm_gem_unmap_dma_buf, | |
284 | .release = drm_gem_dmabuf_release, | |
285 | .kmap = drm_gem_dmabuf_kmap, | |
286 | .kmap_atomic = drm_gem_dmabuf_kmap_atomic, | |
287 | .kunmap = drm_gem_dmabuf_kunmap, | |
288 | .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic, | |
289 | .mmap = drm_gem_dmabuf_mmap, | |
290 | .vmap = drm_gem_dmabuf_vmap, | |
291 | .vunmap = drm_gem_dmabuf_vunmap, | |
292 | }; | |
293 | ||
294 | /** | |
295 | * DOC: PRIME Helpers | |
296 | * | |
297 | * Drivers can implement @gem_prime_export and @gem_prime_import in terms of | |
298 | * simpler APIs by using the helper functions @drm_gem_prime_export and | |
299 | * @drm_gem_prime_import. These functions implement dma-buf support in terms of | |
300 | * five lower-level driver callbacks: | |
301 | * | |
302 | * Export callbacks: | |
303 | * | |
304 | * - @gem_prime_pin (optional): prepare a GEM object for exporting | |
305 | * | |
306 | * - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages | |
307 | * | |
308 | * - @gem_prime_vmap: vmap a buffer exported by your driver | |
309 | * | |
310 | * - @gem_prime_vunmap: vunmap a buffer exported by your driver | |
311 | * | |
312 | * Import callback: | |
313 | * | |
314 | * - @gem_prime_import_sg_table (import): produce a GEM object from another | |
315 | * driver's scatter/gather table | |
316 | */ | |
317 | ||
318 | struct dma_buf *drm_gem_prime_export(struct drm_device *dev, | |
319 | struct drm_gem_object *obj, int flags) | |
320 | { | |
ebc0bad4 | 321 | return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, flags); |
89177644 AP |
322 | } |
323 | EXPORT_SYMBOL(drm_gem_prime_export); | |
324 | ||
319c933c DV |
325 | static struct dma_buf *export_and_register_object(struct drm_device *dev, |
326 | struct drm_gem_object *obj, | |
327 | uint32_t flags) | |
328 | { | |
329 | struct dma_buf *dmabuf; | |
330 | ||
331 | /* prevent races with concurrent gem_close. */ | |
332 | if (obj->handle_count == 0) { | |
333 | dmabuf = ERR_PTR(-ENOENT); | |
334 | return dmabuf; | |
335 | } | |
336 | ||
337 | dmabuf = dev->driver->gem_prime_export(dev, obj, flags); | |
338 | if (IS_ERR(dmabuf)) { | |
339 | /* normally the created dma-buf takes ownership of the ref, | |
340 | * but if that fails then drop the ref | |
341 | */ | |
342 | return dmabuf; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Note that callers do not need to clean up the export cache | |
347 | * since the check for obj->handle_count guarantees that someone | |
348 | * will clean it up. | |
349 | */ | |
350 | obj->dma_buf = dmabuf; | |
351 | get_dma_buf(obj->dma_buf); | |
d0b2c533 DV |
352 | /* Grab a new ref since the callers is now used by the dma-buf */ |
353 | drm_gem_object_reference(obj); | |
319c933c DV |
354 | |
355 | return dmabuf; | |
356 | } | |
357 | ||
3248877e DA |
358 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
359 | struct drm_file *file_priv, uint32_t handle, uint32_t flags, | |
360 | int *prime_fd) | |
361 | { | |
362 | struct drm_gem_object *obj; | |
219b4733 DA |
363 | int ret = 0; |
364 | struct dma_buf *dmabuf; | |
3248877e | 365 | |
d0b2c533 | 366 | mutex_lock(&file_priv->prime.lock); |
3248877e | 367 | obj = drm_gem_object_lookup(dev, file_priv, handle); |
d0b2c533 DV |
368 | if (!obj) { |
369 | ret = -ENOENT; | |
370 | goto out_unlock; | |
371 | } | |
372 | ||
373 | dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle); | |
374 | if (dmabuf) { | |
375 | get_dma_buf(dmabuf); | |
376 | goto out_have_handle; | |
377 | } | |
3248877e | 378 | |
d0b2c533 | 379 | mutex_lock(&dev->object_name_lock); |
3248877e DA |
380 | /* re-export the original imported object */ |
381 | if (obj->import_attach) { | |
219b4733 | 382 | dmabuf = obj->import_attach->dmabuf; |
319c933c | 383 | get_dma_buf(dmabuf); |
219b4733 | 384 | goto out_have_obj; |
3248877e DA |
385 | } |
386 | ||
319c933c DV |
387 | if (obj->dma_buf) { |
388 | get_dma_buf(obj->dma_buf); | |
389 | dmabuf = obj->dma_buf; | |
219b4733 | 390 | goto out_have_obj; |
3248877e | 391 | } |
219b4733 | 392 | |
319c933c | 393 | dmabuf = export_and_register_object(dev, obj, flags); |
4332bf43 | 394 | if (IS_ERR(dmabuf)) { |
219b4733 DA |
395 | /* normally the created dma-buf takes ownership of the ref, |
396 | * but if that fails then drop the ref | |
397 | */ | |
4332bf43 | 398 | ret = PTR_ERR(dmabuf); |
d0b2c533 | 399 | mutex_unlock(&dev->object_name_lock); |
219b4733 DA |
400 | goto out; |
401 | } | |
219b4733 | 402 | |
d0b2c533 DV |
403 | out_have_obj: |
404 | /* | |
405 | * If we've exported this buffer then cheat and add it to the import list | |
406 | * so we get the correct handle back. We must do this under the | |
407 | * protection of dev->object_name_lock to ensure that a racing gem close | |
408 | * ioctl doesn't miss to remove this buffer handle from the cache. | |
0ff926c7 | 409 | */ |
219b4733 | 410 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
319c933c | 411 | dmabuf, handle); |
d0b2c533 | 412 | mutex_unlock(&dev->object_name_lock); |
219b4733 | 413 | if (ret) |
7d8f06ac | 414 | goto fail_put_dmabuf; |
0ff926c7 | 415 | |
d0b2c533 | 416 | out_have_handle: |
4332bf43 | 417 | ret = dma_buf_fd(dmabuf, flags); |
d0b2c533 DV |
418 | /* |
419 | * We must _not_ remove the buffer from the handle cache since the newly | |
420 | * created dma buf is already linked in the global obj->dma_buf pointer, | |
421 | * and that is invariant as long as a userspace gem handle exists. | |
422 | * Closing the handle will clean out the cache anyway, so we don't leak. | |
423 | */ | |
4a88f73f | 424 | if (ret < 0) { |
d0b2c533 | 425 | goto fail_put_dmabuf; |
4a88f73f | 426 | } else { |
da34242e | 427 | *prime_fd = ret; |
4a88f73f DV |
428 | ret = 0; |
429 | } | |
430 | ||
7d8f06ac YC |
431 | goto out; |
432 | ||
433 | fail_put_dmabuf: | |
4332bf43 | 434 | dma_buf_put(dmabuf); |
219b4733 DA |
435 | out: |
436 | drm_gem_object_unreference_unlocked(obj); | |
d0b2c533 DV |
437 | out_unlock: |
438 | mutex_unlock(&file_priv->prime.lock); | |
439 | ||
219b4733 | 440 | return ret; |
3248877e DA |
441 | } |
442 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); | |
443 | ||
89177644 AP |
444 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
445 | struct dma_buf *dma_buf) | |
446 | { | |
447 | struct dma_buf_attachment *attach; | |
448 | struct sg_table *sgt; | |
449 | struct drm_gem_object *obj; | |
450 | int ret; | |
451 | ||
452 | if (!dev->driver->gem_prime_import_sg_table) | |
453 | return ERR_PTR(-EINVAL); | |
454 | ||
455 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { | |
456 | obj = dma_buf->priv; | |
457 | if (obj->dev == dev) { | |
458 | /* | |
459 | * Importing dmabuf exported from out own gem increases | |
460 | * refcount on gem itself instead of f_count of dmabuf. | |
461 | */ | |
462 | drm_gem_object_reference(obj); | |
89177644 AP |
463 | return obj; |
464 | } | |
465 | } | |
466 | ||
467 | attach = dma_buf_attach(dma_buf, dev->dev); | |
468 | if (IS_ERR(attach)) | |
f2a5da4f | 469 | return ERR_CAST(attach); |
89177644 | 470 | |
011c2282 ID |
471 | get_dma_buf(dma_buf); |
472 | ||
89177644 AP |
473 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
474 | if (IS_ERR_OR_NULL(sgt)) { | |
475 | ret = PTR_ERR(sgt); | |
476 | goto fail_detach; | |
477 | } | |
478 | ||
479 | obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt); | |
480 | if (IS_ERR(obj)) { | |
481 | ret = PTR_ERR(obj); | |
482 | goto fail_unmap; | |
483 | } | |
484 | ||
485 | obj->import_attach = attach; | |
486 | ||
487 | return obj; | |
488 | ||
489 | fail_unmap: | |
490 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); | |
491 | fail_detach: | |
492 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
493 | dma_buf_put(dma_buf); |
494 | ||
89177644 AP |
495 | return ERR_PTR(ret); |
496 | } | |
497 | EXPORT_SYMBOL(drm_gem_prime_import); | |
498 | ||
3248877e DA |
499 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
500 | struct drm_file *file_priv, int prime_fd, uint32_t *handle) | |
501 | { | |
502 | struct dma_buf *dma_buf; | |
503 | struct drm_gem_object *obj; | |
504 | int ret; | |
505 | ||
506 | dma_buf = dma_buf_get(prime_fd); | |
507 | if (IS_ERR(dma_buf)) | |
508 | return PTR_ERR(dma_buf); | |
509 | ||
510 | mutex_lock(&file_priv->prime.lock); | |
511 | ||
219b4733 | 512 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
3248877e | 513 | dma_buf, handle); |
84341c28 | 514 | if (ret == 0) |
3248877e | 515 | goto out_put; |
3248877e DA |
516 | |
517 | /* never seen this one, need to import */ | |
319c933c | 518 | mutex_lock(&dev->object_name_lock); |
3248877e DA |
519 | obj = dev->driver->gem_prime_import(dev, dma_buf); |
520 | if (IS_ERR(obj)) { | |
521 | ret = PTR_ERR(obj); | |
319c933c DV |
522 | goto out_unlock; |
523 | } | |
524 | ||
525 | if (obj->dma_buf) { | |
526 | WARN_ON(obj->dma_buf != dma_buf); | |
527 | } else { | |
528 | obj->dma_buf = dma_buf; | |
529 | get_dma_buf(dma_buf); | |
3248877e DA |
530 | } |
531 | ||
319c933c DV |
532 | /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */ |
533 | ret = drm_gem_handle_create_tail(file_priv, obj, handle); | |
3248877e DA |
534 | drm_gem_object_unreference_unlocked(obj); |
535 | if (ret) | |
536 | goto out_put; | |
537 | ||
219b4733 | 538 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
3248877e DA |
539 | dma_buf, *handle); |
540 | if (ret) | |
541 | goto fail; | |
542 | ||
543 | mutex_unlock(&file_priv->prime.lock); | |
011c2282 ID |
544 | |
545 | dma_buf_put(dma_buf); | |
546 | ||
3248877e DA |
547 | return 0; |
548 | ||
549 | fail: | |
550 | /* hmm, if driver attached, we are relying on the free-object path | |
551 | * to detach.. which seems ok.. | |
552 | */ | |
730c4ff9 | 553 | drm_gem_handle_delete(file_priv, *handle); |
319c933c | 554 | out_unlock: |
0adb2370 | 555 | mutex_unlock(&dev->object_name_lock); |
3248877e DA |
556 | out_put: |
557 | dma_buf_put(dma_buf); | |
558 | mutex_unlock(&file_priv->prime.lock); | |
559 | return ret; | |
560 | } | |
561 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); | |
562 | ||
563 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
564 | struct drm_file *file_priv) | |
565 | { | |
566 | struct drm_prime_handle *args = data; | |
567 | uint32_t flags; | |
568 | ||
569 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
570 | return -EINVAL; | |
571 | ||
572 | if (!dev->driver->prime_handle_to_fd) | |
573 | return -ENOSYS; | |
574 | ||
575 | /* check flags are valid */ | |
576 | if (args->flags & ~DRM_CLOEXEC) | |
577 | return -EINVAL; | |
578 | ||
579 | /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */ | |
580 | flags = args->flags & DRM_CLOEXEC; | |
581 | ||
582 | return dev->driver->prime_handle_to_fd(dev, file_priv, | |
583 | args->handle, flags, &args->fd); | |
584 | } | |
585 | ||
586 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
587 | struct drm_file *file_priv) | |
588 | { | |
589 | struct drm_prime_handle *args = data; | |
590 | ||
591 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
592 | return -EINVAL; | |
593 | ||
594 | if (!dev->driver->prime_fd_to_handle) | |
595 | return -ENOSYS; | |
596 | ||
597 | return dev->driver->prime_fd_to_handle(dev, file_priv, | |
598 | args->fd, &args->handle); | |
599 | } | |
600 | ||
601 | /* | |
602 | * drm_prime_pages_to_sg | |
603 | * | |
604 | * this helper creates an sg table object from a set of pages | |
605 | * the driver is responsible for mapping the pages into the | |
606 | * importers address space | |
607 | */ | |
608 | struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages) | |
609 | { | |
610 | struct sg_table *sg = NULL; | |
3248877e DA |
611 | int ret; |
612 | ||
613 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
7e3d88f9 YC |
614 | if (!sg) { |
615 | ret = -ENOMEM; | |
3248877e | 616 | goto out; |
7e3d88f9 | 617 | } |
3248877e | 618 | |
dca25cb8 RS |
619 | ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
620 | nr_pages << PAGE_SHIFT, GFP_KERNEL); | |
3248877e DA |
621 | if (ret) |
622 | goto out; | |
623 | ||
3248877e DA |
624 | return sg; |
625 | out: | |
626 | kfree(sg); | |
7e3d88f9 | 627 | return ERR_PTR(ret); |
3248877e DA |
628 | } |
629 | EXPORT_SYMBOL(drm_prime_pages_to_sg); | |
630 | ||
51ab7ba2 DA |
631 | /* export an sg table into an array of pages and addresses |
632 | this is currently required by the TTM driver in order to do correct fault | |
633 | handling */ | |
634 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, | |
635 | dma_addr_t *addrs, int max_pages) | |
636 | { | |
637 | unsigned count; | |
638 | struct scatterlist *sg; | |
639 | struct page *page; | |
36dccc84 | 640 | u32 len; |
51ab7ba2 DA |
641 | int pg_index; |
642 | dma_addr_t addr; | |
643 | ||
644 | pg_index = 0; | |
645 | for_each_sg(sgt->sgl, sg, sgt->nents, count) { | |
646 | len = sg->length; | |
51ab7ba2 DA |
647 | page = sg_page(sg); |
648 | addr = sg_dma_address(sg); | |
649 | ||
650 | while (len > 0) { | |
651 | if (WARN_ON(pg_index >= max_pages)) | |
652 | return -1; | |
653 | pages[pg_index] = page; | |
654 | if (addrs) | |
655 | addrs[pg_index] = addr; | |
656 | ||
657 | page++; | |
658 | addr += PAGE_SIZE; | |
659 | len -= PAGE_SIZE; | |
660 | pg_index++; | |
661 | } | |
662 | } | |
663 | return 0; | |
664 | } | |
665 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); | |
3248877e DA |
666 | /* helper function to cleanup a GEM/prime object */ |
667 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) | |
668 | { | |
669 | struct dma_buf_attachment *attach; | |
670 | struct dma_buf *dma_buf; | |
671 | attach = obj->import_attach; | |
672 | if (sg) | |
673 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
674 | dma_buf = attach->dmabuf; | |
675 | dma_buf_detach(attach->dmabuf, attach); | |
676 | /* remove the reference */ | |
677 | dma_buf_put(dma_buf); | |
678 | } | |
679 | EXPORT_SYMBOL(drm_prime_gem_destroy); | |
680 | ||
681 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) | |
682 | { | |
683 | INIT_LIST_HEAD(&prime_fpriv->head); | |
684 | mutex_init(&prime_fpriv->lock); | |
685 | } | |
686 | EXPORT_SYMBOL(drm_prime_init_file_private); | |
687 | ||
688 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) | |
689 | { | |
98b76231 ID |
690 | /* by now drm_gem_release should've made sure the list is empty */ |
691 | WARN_ON(!list_empty(&prime_fpriv->head)); | |
3248877e DA |
692 | } |
693 | EXPORT_SYMBOL(drm_prime_destroy_file_private); |