Commit | Line | Data |
---|---|---|
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 | |
ca793f75 ML |
86 | static int drm_gem_map_attach(struct dma_buf *dma_buf, |
87 | struct device *target_dev, | |
88 | struct dma_buf_attachment *attach) | |
89 | { | |
538d6661 | 90 | struct drm_prime_attachment *prime_attach; |
ca793f75 ML |
91 | struct drm_gem_object *obj = dma_buf->priv; |
92 | struct drm_device *dev = obj->dev; | |
93 | ||
538d6661 JS |
94 | prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL); |
95 | if (!prime_attach) | |
96 | return -ENOMEM; | |
97 | ||
98 | prime_attach->dir = DMA_NONE; | |
99 | attach->priv = prime_attach; | |
100 | ||
ca793f75 ML |
101 | if (!dev->driver->gem_prime_pin) |
102 | return 0; | |
103 | ||
104 | return dev->driver->gem_prime_pin(obj); | |
105 | } | |
106 | ||
107 | static void drm_gem_map_detach(struct dma_buf *dma_buf, | |
108 | struct dma_buf_attachment *attach) | |
109 | { | |
538d6661 | 110 | struct drm_prime_attachment *prime_attach = attach->priv; |
ca793f75 ML |
111 | struct drm_gem_object *obj = dma_buf->priv; |
112 | struct drm_device *dev = obj->dev; | |
538d6661 | 113 | struct sg_table *sgt; |
ca793f75 ML |
114 | |
115 | if (dev->driver->gem_prime_unpin) | |
116 | dev->driver->gem_prime_unpin(obj); | |
538d6661 JS |
117 | |
118 | if (!prime_attach) | |
119 | return; | |
120 | ||
121 | sgt = prime_attach->sgt; | |
122 | ||
123 | if (prime_attach->dir != DMA_NONE) | |
124 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, | |
125 | prime_attach->dir); | |
126 | ||
127 | sg_free_table(sgt); | |
128 | kfree(sgt); | |
129 | kfree(prime_attach); | |
130 | attach->priv = NULL; | |
ca793f75 ML |
131 | } |
132 | ||
da34242e YC |
133 | static void drm_prime_remove_buf_handle_locked( |
134 | struct drm_prime_file_private *prime_fpriv, | |
135 | struct dma_buf *dma_buf) | |
136 | { | |
137 | struct drm_prime_member *member, *safe; | |
138 | ||
139 | list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) { | |
140 | if (member->dma_buf == dma_buf) { | |
141 | dma_buf_put(dma_buf); | |
142 | list_del(&member->entry); | |
143 | kfree(member); | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
89177644 AP |
148 | static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
149 | enum dma_data_direction dir) | |
150 | { | |
538d6661 | 151 | struct drm_prime_attachment *prime_attach = attach->priv; |
89177644 AP |
152 | struct drm_gem_object *obj = attach->dmabuf->priv; |
153 | struct sg_table *sgt; | |
154 | ||
538d6661 JS |
155 | if (WARN_ON(dir == DMA_NONE || !prime_attach)) |
156 | return ERR_PTR(-EINVAL); | |
157 | ||
158 | /* return the cached mapping when possible */ | |
159 | if (prime_attach->dir == dir) | |
160 | return prime_attach->sgt; | |
161 | ||
162 | /* | |
163 | * two mappings with different directions for the same attachment are | |
164 | * not allowed | |
165 | */ | |
166 | if (WARN_ON(prime_attach->dir != DMA_NONE)) | |
167 | return ERR_PTR(-EBUSY); | |
168 | ||
89177644 AP |
169 | mutex_lock(&obj->dev->struct_mutex); |
170 | ||
171 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); | |
172 | ||
7e3d88f9 | 173 | if (!IS_ERR(sgt)) { |
b720d54a YC |
174 | if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) { |
175 | sg_free_table(sgt); | |
176 | kfree(sgt); | |
177 | sgt = ERR_PTR(-ENOMEM); | |
538d6661 JS |
178 | } else { |
179 | prime_attach->sgt = sgt; | |
180 | prime_attach->dir = dir; | |
b720d54a YC |
181 | } |
182 | } | |
89177644 AP |
183 | |
184 | mutex_unlock(&obj->dev->struct_mutex); | |
185 | return sgt; | |
186 | } | |
187 | ||
188 | static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, | |
189 | struct sg_table *sgt, enum dma_data_direction dir) | |
190 | { | |
538d6661 | 191 | /* nothing to be done here */ |
89177644 AP |
192 | } |
193 | ||
194 | static void drm_gem_dmabuf_release(struct dma_buf *dma_buf) | |
195 | { | |
196 | struct drm_gem_object *obj = dma_buf->priv; | |
197 | ||
198 | if (obj->export_dma_buf == dma_buf) { | |
199 | /* drop the reference on the export fd holds */ | |
200 | obj->export_dma_buf = NULL; | |
201 | drm_gem_object_unreference_unlocked(obj); | |
202 | } | |
203 | } | |
204 | ||
205 | static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) | |
206 | { | |
207 | struct drm_gem_object *obj = dma_buf->priv; | |
208 | struct drm_device *dev = obj->dev; | |
209 | ||
210 | return dev->driver->gem_prime_vmap(obj); | |
211 | } | |
212 | ||
213 | static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
214 | { | |
215 | struct drm_gem_object *obj = dma_buf->priv; | |
216 | struct drm_device *dev = obj->dev; | |
217 | ||
218 | dev->driver->gem_prime_vunmap(obj, vaddr); | |
219 | } | |
220 | ||
221 | static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, | |
222 | unsigned long page_num) | |
223 | { | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, | |
228 | unsigned long page_num, void *addr) | |
229 | { | |
230 | ||
231 | } | |
232 | static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, | |
233 | unsigned long page_num) | |
234 | { | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, | |
239 | unsigned long page_num, void *addr) | |
240 | { | |
241 | ||
242 | } | |
243 | ||
244 | static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, | |
245 | struct vm_area_struct *vma) | |
246 | { | |
247 | return -EINVAL; | |
248 | } | |
249 | ||
250 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { | |
ca793f75 ML |
251 | .attach = drm_gem_map_attach, |
252 | .detach = drm_gem_map_detach, | |
89177644 AP |
253 | .map_dma_buf = drm_gem_map_dma_buf, |
254 | .unmap_dma_buf = drm_gem_unmap_dma_buf, | |
255 | .release = drm_gem_dmabuf_release, | |
256 | .kmap = drm_gem_dmabuf_kmap, | |
257 | .kmap_atomic = drm_gem_dmabuf_kmap_atomic, | |
258 | .kunmap = drm_gem_dmabuf_kunmap, | |
259 | .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic, | |
260 | .mmap = drm_gem_dmabuf_mmap, | |
261 | .vmap = drm_gem_dmabuf_vmap, | |
262 | .vunmap = drm_gem_dmabuf_vunmap, | |
263 | }; | |
264 | ||
265 | /** | |
266 | * DOC: PRIME Helpers | |
267 | * | |
268 | * Drivers can implement @gem_prime_export and @gem_prime_import in terms of | |
269 | * simpler APIs by using the helper functions @drm_gem_prime_export and | |
270 | * @drm_gem_prime_import. These functions implement dma-buf support in terms of | |
271 | * five lower-level driver callbacks: | |
272 | * | |
273 | * Export callbacks: | |
274 | * | |
275 | * - @gem_prime_pin (optional): prepare a GEM object for exporting | |
276 | * | |
277 | * - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages | |
278 | * | |
279 | * - @gem_prime_vmap: vmap a buffer exported by your driver | |
280 | * | |
281 | * - @gem_prime_vunmap: vunmap a buffer exported by your driver | |
282 | * | |
283 | * Import callback: | |
284 | * | |
285 | * - @gem_prime_import_sg_table (import): produce a GEM object from another | |
286 | * driver's scatter/gather table | |
287 | */ | |
288 | ||
289 | struct dma_buf *drm_gem_prime_export(struct drm_device *dev, | |
290 | struct drm_gem_object *obj, int flags) | |
291 | { | |
ebc0bad4 | 292 | return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, flags); |
89177644 AP |
293 | } |
294 | EXPORT_SYMBOL(drm_gem_prime_export); | |
295 | ||
3248877e DA |
296 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
297 | struct drm_file *file_priv, uint32_t handle, uint32_t flags, | |
298 | int *prime_fd) | |
299 | { | |
300 | struct drm_gem_object *obj; | |
301 | void *buf; | |
219b4733 DA |
302 | int ret = 0; |
303 | struct dma_buf *dmabuf; | |
3248877e DA |
304 | |
305 | obj = drm_gem_object_lookup(dev, file_priv, handle); | |
306 | if (!obj) | |
307 | return -ENOENT; | |
308 | ||
309 | mutex_lock(&file_priv->prime.lock); | |
310 | /* re-export the original imported object */ | |
311 | if (obj->import_attach) { | |
219b4733 DA |
312 | dmabuf = obj->import_attach->dmabuf; |
313 | goto out_have_obj; | |
3248877e DA |
314 | } |
315 | ||
316 | if (obj->export_dma_buf) { | |
219b4733 DA |
317 | dmabuf = obj->export_dma_buf; |
318 | goto out_have_obj; | |
3248877e | 319 | } |
219b4733 DA |
320 | |
321 | buf = dev->driver->gem_prime_export(dev, obj, flags); | |
322 | if (IS_ERR(buf)) { | |
323 | /* normally the created dma-buf takes ownership of the ref, | |
324 | * but if that fails then drop the ref | |
325 | */ | |
326 | ret = PTR_ERR(buf); | |
327 | goto out; | |
328 | } | |
329 | obj->export_dma_buf = buf; | |
330 | ||
0ff926c7 DA |
331 | /* if we've exported this buffer the cheat and add it to the import list |
332 | * so we get the correct handle back | |
333 | */ | |
219b4733 DA |
334 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
335 | obj->export_dma_buf, handle); | |
336 | if (ret) | |
7d8f06ac | 337 | goto fail_put_dmabuf; |
0ff926c7 | 338 | |
da34242e YC |
339 | ret = dma_buf_fd(buf, flags); |
340 | if (ret < 0) | |
341 | goto fail_rm_handle; | |
342 | ||
343 | *prime_fd = ret; | |
3248877e DA |
344 | mutex_unlock(&file_priv->prime.lock); |
345 | return 0; | |
219b4733 DA |
346 | |
347 | out_have_obj: | |
348 | get_dma_buf(dmabuf); | |
da34242e | 349 | ret = dma_buf_fd(dmabuf, flags); |
4a88f73f | 350 | if (ret < 0) { |
da34242e | 351 | dma_buf_put(dmabuf); |
4a88f73f | 352 | } else { |
da34242e | 353 | *prime_fd = ret; |
4a88f73f DV |
354 | ret = 0; |
355 | } | |
356 | ||
7d8f06ac YC |
357 | goto out; |
358 | ||
da34242e YC |
359 | fail_rm_handle: |
360 | drm_prime_remove_buf_handle_locked(&file_priv->prime, buf); | |
7d8f06ac YC |
361 | fail_put_dmabuf: |
362 | /* clear NOT to be checked when releasing dma_buf */ | |
363 | obj->export_dma_buf = NULL; | |
364 | dma_buf_put(buf); | |
219b4733 DA |
365 | out: |
366 | drm_gem_object_unreference_unlocked(obj); | |
367 | mutex_unlock(&file_priv->prime.lock); | |
368 | return ret; | |
3248877e DA |
369 | } |
370 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); | |
371 | ||
89177644 AP |
372 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
373 | struct dma_buf *dma_buf) | |
374 | { | |
375 | struct dma_buf_attachment *attach; | |
376 | struct sg_table *sgt; | |
377 | struct drm_gem_object *obj; | |
378 | int ret; | |
379 | ||
380 | if (!dev->driver->gem_prime_import_sg_table) | |
381 | return ERR_PTR(-EINVAL); | |
382 | ||
383 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { | |
384 | obj = dma_buf->priv; | |
385 | if (obj->dev == dev) { | |
386 | /* | |
387 | * Importing dmabuf exported from out own gem increases | |
388 | * refcount on gem itself instead of f_count of dmabuf. | |
389 | */ | |
390 | drm_gem_object_reference(obj); | |
89177644 AP |
391 | return obj; |
392 | } | |
393 | } | |
394 | ||
395 | attach = dma_buf_attach(dma_buf, dev->dev); | |
396 | if (IS_ERR(attach)) | |
f2a5da4f | 397 | return ERR_CAST(attach); |
89177644 | 398 | |
011c2282 ID |
399 | get_dma_buf(dma_buf); |
400 | ||
89177644 AP |
401 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
402 | if (IS_ERR_OR_NULL(sgt)) { | |
403 | ret = PTR_ERR(sgt); | |
404 | goto fail_detach; | |
405 | } | |
406 | ||
407 | obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt); | |
408 | if (IS_ERR(obj)) { | |
409 | ret = PTR_ERR(obj); | |
410 | goto fail_unmap; | |
411 | } | |
412 | ||
413 | obj->import_attach = attach; | |
414 | ||
415 | return obj; | |
416 | ||
417 | fail_unmap: | |
418 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); | |
419 | fail_detach: | |
420 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
421 | dma_buf_put(dma_buf); |
422 | ||
89177644 AP |
423 | return ERR_PTR(ret); |
424 | } | |
425 | EXPORT_SYMBOL(drm_gem_prime_import); | |
426 | ||
3248877e DA |
427 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
428 | struct drm_file *file_priv, int prime_fd, uint32_t *handle) | |
429 | { | |
430 | struct dma_buf *dma_buf; | |
431 | struct drm_gem_object *obj; | |
432 | int ret; | |
433 | ||
434 | dma_buf = dma_buf_get(prime_fd); | |
435 | if (IS_ERR(dma_buf)) | |
436 | return PTR_ERR(dma_buf); | |
437 | ||
438 | mutex_lock(&file_priv->prime.lock); | |
439 | ||
219b4733 | 440 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
3248877e DA |
441 | dma_buf, handle); |
442 | if (!ret) { | |
443 | ret = 0; | |
444 | goto out_put; | |
445 | } | |
446 | ||
447 | /* never seen this one, need to import */ | |
448 | obj = dev->driver->gem_prime_import(dev, dma_buf); | |
449 | if (IS_ERR(obj)) { | |
450 | ret = PTR_ERR(obj); | |
451 | goto out_put; | |
452 | } | |
453 | ||
454 | ret = drm_gem_handle_create(file_priv, obj, handle); | |
455 | drm_gem_object_unreference_unlocked(obj); | |
456 | if (ret) | |
457 | goto out_put; | |
458 | ||
219b4733 | 459 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
3248877e DA |
460 | dma_buf, *handle); |
461 | if (ret) | |
462 | goto fail; | |
463 | ||
464 | mutex_unlock(&file_priv->prime.lock); | |
011c2282 ID |
465 | |
466 | dma_buf_put(dma_buf); | |
467 | ||
3248877e DA |
468 | return 0; |
469 | ||
470 | fail: | |
471 | /* hmm, if driver attached, we are relying on the free-object path | |
472 | * to detach.. which seems ok.. | |
473 | */ | |
474 | drm_gem_object_handle_unreference_unlocked(obj); | |
475 | out_put: | |
476 | dma_buf_put(dma_buf); | |
477 | mutex_unlock(&file_priv->prime.lock); | |
478 | return ret; | |
479 | } | |
480 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); | |
481 | ||
482 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
483 | struct drm_file *file_priv) | |
484 | { | |
485 | struct drm_prime_handle *args = data; | |
486 | uint32_t flags; | |
487 | ||
488 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
489 | return -EINVAL; | |
490 | ||
491 | if (!dev->driver->prime_handle_to_fd) | |
492 | return -ENOSYS; | |
493 | ||
494 | /* check flags are valid */ | |
495 | if (args->flags & ~DRM_CLOEXEC) | |
496 | return -EINVAL; | |
497 | ||
498 | /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */ | |
499 | flags = args->flags & DRM_CLOEXEC; | |
500 | ||
501 | return dev->driver->prime_handle_to_fd(dev, file_priv, | |
502 | args->handle, flags, &args->fd); | |
503 | } | |
504 | ||
505 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
506 | struct drm_file *file_priv) | |
507 | { | |
508 | struct drm_prime_handle *args = data; | |
509 | ||
510 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
511 | return -EINVAL; | |
512 | ||
513 | if (!dev->driver->prime_fd_to_handle) | |
514 | return -ENOSYS; | |
515 | ||
516 | return dev->driver->prime_fd_to_handle(dev, file_priv, | |
517 | args->fd, &args->handle); | |
518 | } | |
519 | ||
520 | /* | |
521 | * drm_prime_pages_to_sg | |
522 | * | |
523 | * this helper creates an sg table object from a set of pages | |
524 | * the driver is responsible for mapping the pages into the | |
525 | * importers address space | |
526 | */ | |
527 | struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages) | |
528 | { | |
529 | struct sg_table *sg = NULL; | |
3248877e DA |
530 | int ret; |
531 | ||
532 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
7e3d88f9 YC |
533 | if (!sg) { |
534 | ret = -ENOMEM; | |
3248877e | 535 | goto out; |
7e3d88f9 | 536 | } |
3248877e | 537 | |
dca25cb8 RS |
538 | ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
539 | nr_pages << PAGE_SHIFT, GFP_KERNEL); | |
3248877e DA |
540 | if (ret) |
541 | goto out; | |
542 | ||
3248877e DA |
543 | return sg; |
544 | out: | |
545 | kfree(sg); | |
7e3d88f9 | 546 | return ERR_PTR(ret); |
3248877e DA |
547 | } |
548 | EXPORT_SYMBOL(drm_prime_pages_to_sg); | |
549 | ||
51ab7ba2 DA |
550 | /* export an sg table into an array of pages and addresses |
551 | this is currently required by the TTM driver in order to do correct fault | |
552 | handling */ | |
553 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, | |
554 | dma_addr_t *addrs, int max_pages) | |
555 | { | |
556 | unsigned count; | |
557 | struct scatterlist *sg; | |
558 | struct page *page; | |
559 | u32 len, offset; | |
560 | int pg_index; | |
561 | dma_addr_t addr; | |
562 | ||
563 | pg_index = 0; | |
564 | for_each_sg(sgt->sgl, sg, sgt->nents, count) { | |
565 | len = sg->length; | |
566 | offset = sg->offset; | |
567 | page = sg_page(sg); | |
568 | addr = sg_dma_address(sg); | |
569 | ||
570 | while (len > 0) { | |
571 | if (WARN_ON(pg_index >= max_pages)) | |
572 | return -1; | |
573 | pages[pg_index] = page; | |
574 | if (addrs) | |
575 | addrs[pg_index] = addr; | |
576 | ||
577 | page++; | |
578 | addr += PAGE_SIZE; | |
579 | len -= PAGE_SIZE; | |
580 | pg_index++; | |
581 | } | |
582 | } | |
583 | return 0; | |
584 | } | |
585 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); | |
3248877e DA |
586 | /* helper function to cleanup a GEM/prime object */ |
587 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) | |
588 | { | |
589 | struct dma_buf_attachment *attach; | |
590 | struct dma_buf *dma_buf; | |
591 | attach = obj->import_attach; | |
592 | if (sg) | |
593 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
594 | dma_buf = attach->dmabuf; | |
595 | dma_buf_detach(attach->dmabuf, attach); | |
596 | /* remove the reference */ | |
597 | dma_buf_put(dma_buf); | |
598 | } | |
599 | EXPORT_SYMBOL(drm_prime_gem_destroy); | |
600 | ||
601 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) | |
602 | { | |
603 | INIT_LIST_HEAD(&prime_fpriv->head); | |
604 | mutex_init(&prime_fpriv->lock); | |
605 | } | |
606 | EXPORT_SYMBOL(drm_prime_init_file_private); | |
607 | ||
608 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) | |
609 | { | |
98b76231 ID |
610 | /* by now drm_gem_release should've made sure the list is empty */ |
611 | WARN_ON(!list_empty(&prime_fpriv->head)); | |
3248877e DA |
612 | } |
613 | EXPORT_SYMBOL(drm_prime_destroy_file_private); | |
614 | ||
219b4733 | 615 | int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle) |
3248877e DA |
616 | { |
617 | struct drm_prime_member *member; | |
618 | ||
619 | list_for_each_entry(member, &prime_fpriv->head, entry) { | |
620 | if (member->dma_buf == dma_buf) { | |
621 | *handle = member->handle; | |
622 | return 0; | |
623 | } | |
624 | } | |
625 | return -ENOENT; | |
626 | } | |
219b4733 | 627 | EXPORT_SYMBOL(drm_prime_lookup_buf_handle); |
3248877e | 628 | |
219b4733 | 629 | void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf) |
3248877e | 630 | { |
3248877e | 631 | mutex_lock(&prime_fpriv->lock); |
da34242e | 632 | drm_prime_remove_buf_handle_locked(prime_fpriv, dma_buf); |
3248877e DA |
633 | mutex_unlock(&prime_fpriv->lock); |
634 | } | |
219b4733 | 635 | EXPORT_SYMBOL(drm_prime_remove_buf_handle); |