Commit | Line | Data |
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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 | |
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; | |
f9d8a129 JS |
122 | if (sgt) { |
123 | if (prime_attach->dir != DMA_NONE) | |
124 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, | |
125 | prime_attach->dir); | |
126 | sg_free_table(sgt); | |
127 | } | |
538d6661 | 128 | |
538d6661 JS |
129 | kfree(sgt); |
130 | kfree(prime_attach); | |
131 | attach->priv = NULL; | |
ca793f75 ML |
132 | } |
133 | ||
da34242e YC |
134 | static void drm_prime_remove_buf_handle_locked( |
135 | struct drm_prime_file_private *prime_fpriv, | |
136 | struct dma_buf *dma_buf) | |
137 | { | |
138 | struct drm_prime_member *member, *safe; | |
139 | ||
140 | list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) { | |
141 | if (member->dma_buf == dma_buf) { | |
142 | dma_buf_put(dma_buf); | |
143 | list_del(&member->entry); | |
144 | kfree(member); | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
89177644 AP |
149 | static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
150 | enum dma_data_direction dir) | |
151 | { | |
538d6661 | 152 | struct drm_prime_attachment *prime_attach = attach->priv; |
89177644 AP |
153 | struct drm_gem_object *obj = attach->dmabuf->priv; |
154 | struct sg_table *sgt; | |
155 | ||
538d6661 JS |
156 | if (WARN_ON(dir == DMA_NONE || !prime_attach)) |
157 | return ERR_PTR(-EINVAL); | |
158 | ||
159 | /* return the cached mapping when possible */ | |
160 | if (prime_attach->dir == dir) | |
161 | return prime_attach->sgt; | |
162 | ||
163 | /* | |
164 | * two mappings with different directions for the same attachment are | |
165 | * not allowed | |
166 | */ | |
167 | if (WARN_ON(prime_attach->dir != DMA_NONE)) | |
168 | return ERR_PTR(-EBUSY); | |
169 | ||
89177644 AP |
170 | mutex_lock(&obj->dev->struct_mutex); |
171 | ||
172 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); | |
173 | ||
7e3d88f9 | 174 | if (!IS_ERR(sgt)) { |
b720d54a YC |
175 | if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) { |
176 | sg_free_table(sgt); | |
177 | kfree(sgt); | |
178 | sgt = ERR_PTR(-ENOMEM); | |
538d6661 JS |
179 | } else { |
180 | prime_attach->sgt = sgt; | |
181 | prime_attach->dir = dir; | |
b720d54a YC |
182 | } |
183 | } | |
89177644 AP |
184 | |
185 | mutex_unlock(&obj->dev->struct_mutex); | |
186 | return sgt; | |
187 | } | |
188 | ||
189 | static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, | |
190 | struct sg_table *sgt, enum dma_data_direction dir) | |
191 | { | |
538d6661 | 192 | /* nothing to be done here */ |
89177644 AP |
193 | } |
194 | ||
195 | static void drm_gem_dmabuf_release(struct dma_buf *dma_buf) | |
196 | { | |
197 | struct drm_gem_object *obj = dma_buf->priv; | |
198 | ||
199 | if (obj->export_dma_buf == dma_buf) { | |
200 | /* drop the reference on the export fd holds */ | |
201 | obj->export_dma_buf = NULL; | |
202 | drm_gem_object_unreference_unlocked(obj); | |
203 | } | |
204 | } | |
205 | ||
206 | static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) | |
207 | { | |
208 | struct drm_gem_object *obj = dma_buf->priv; | |
209 | struct drm_device *dev = obj->dev; | |
210 | ||
211 | return dev->driver->gem_prime_vmap(obj); | |
212 | } | |
213 | ||
214 | static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
215 | { | |
216 | struct drm_gem_object *obj = dma_buf->priv; | |
217 | struct drm_device *dev = obj->dev; | |
218 | ||
219 | dev->driver->gem_prime_vunmap(obj, vaddr); | |
220 | } | |
221 | ||
222 | static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, | |
223 | unsigned long page_num) | |
224 | { | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, | |
229 | unsigned long page_num, void *addr) | |
230 | { | |
231 | ||
232 | } | |
233 | static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, | |
234 | unsigned long page_num) | |
235 | { | |
236 | return NULL; | |
237 | } | |
238 | ||
239 | static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, | |
240 | unsigned long page_num, void *addr) | |
241 | { | |
242 | ||
243 | } | |
244 | ||
245 | static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, | |
246 | struct vm_area_struct *vma) | |
247 | { | |
7c397cd9 JS |
248 | struct drm_gem_object *obj = dma_buf->priv; |
249 | struct drm_device *dev = obj->dev; | |
250 | ||
251 | if (!dev->driver->gem_prime_mmap) | |
252 | return -ENOSYS; | |
253 | ||
254 | return dev->driver->gem_prime_mmap(obj, vma); | |
89177644 AP |
255 | } |
256 | ||
257 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { | |
ca793f75 ML |
258 | .attach = drm_gem_map_attach, |
259 | .detach = drm_gem_map_detach, | |
89177644 AP |
260 | .map_dma_buf = drm_gem_map_dma_buf, |
261 | .unmap_dma_buf = drm_gem_unmap_dma_buf, | |
262 | .release = drm_gem_dmabuf_release, | |
263 | .kmap = drm_gem_dmabuf_kmap, | |
264 | .kmap_atomic = drm_gem_dmabuf_kmap_atomic, | |
265 | .kunmap = drm_gem_dmabuf_kunmap, | |
266 | .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic, | |
267 | .mmap = drm_gem_dmabuf_mmap, | |
268 | .vmap = drm_gem_dmabuf_vmap, | |
269 | .vunmap = drm_gem_dmabuf_vunmap, | |
270 | }; | |
271 | ||
272 | /** | |
273 | * DOC: PRIME Helpers | |
274 | * | |
275 | * Drivers can implement @gem_prime_export and @gem_prime_import in terms of | |
276 | * simpler APIs by using the helper functions @drm_gem_prime_export and | |
277 | * @drm_gem_prime_import. These functions implement dma-buf support in terms of | |
278 | * five lower-level driver callbacks: | |
279 | * | |
280 | * Export callbacks: | |
281 | * | |
282 | * - @gem_prime_pin (optional): prepare a GEM object for exporting | |
283 | * | |
284 | * - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages | |
285 | * | |
286 | * - @gem_prime_vmap: vmap a buffer exported by your driver | |
287 | * | |
288 | * - @gem_prime_vunmap: vunmap a buffer exported by your driver | |
289 | * | |
290 | * Import callback: | |
291 | * | |
292 | * - @gem_prime_import_sg_table (import): produce a GEM object from another | |
293 | * driver's scatter/gather table | |
294 | */ | |
295 | ||
296 | struct dma_buf *drm_gem_prime_export(struct drm_device *dev, | |
297 | struct drm_gem_object *obj, int flags) | |
298 | { | |
ebc0bad4 | 299 | return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, flags); |
89177644 AP |
300 | } |
301 | EXPORT_SYMBOL(drm_gem_prime_export); | |
302 | ||
3248877e DA |
303 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
304 | struct drm_file *file_priv, uint32_t handle, uint32_t flags, | |
305 | int *prime_fd) | |
306 | { | |
307 | struct drm_gem_object *obj; | |
308 | void *buf; | |
219b4733 DA |
309 | int ret = 0; |
310 | struct dma_buf *dmabuf; | |
3248877e DA |
311 | |
312 | obj = drm_gem_object_lookup(dev, file_priv, handle); | |
313 | if (!obj) | |
314 | return -ENOENT; | |
315 | ||
316 | mutex_lock(&file_priv->prime.lock); | |
317 | /* re-export the original imported object */ | |
318 | if (obj->import_attach) { | |
219b4733 DA |
319 | dmabuf = obj->import_attach->dmabuf; |
320 | goto out_have_obj; | |
3248877e DA |
321 | } |
322 | ||
323 | if (obj->export_dma_buf) { | |
219b4733 DA |
324 | dmabuf = obj->export_dma_buf; |
325 | goto out_have_obj; | |
3248877e | 326 | } |
219b4733 DA |
327 | |
328 | buf = dev->driver->gem_prime_export(dev, obj, flags); | |
329 | if (IS_ERR(buf)) { | |
330 | /* normally the created dma-buf takes ownership of the ref, | |
331 | * but if that fails then drop the ref | |
332 | */ | |
333 | ret = PTR_ERR(buf); | |
334 | goto out; | |
335 | } | |
336 | obj->export_dma_buf = buf; | |
337 | ||
0ff926c7 DA |
338 | /* if we've exported this buffer the cheat and add it to the import list |
339 | * so we get the correct handle back | |
340 | */ | |
219b4733 DA |
341 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
342 | obj->export_dma_buf, handle); | |
343 | if (ret) | |
7d8f06ac | 344 | goto fail_put_dmabuf; |
0ff926c7 | 345 | |
da34242e YC |
346 | ret = dma_buf_fd(buf, flags); |
347 | if (ret < 0) | |
348 | goto fail_rm_handle; | |
349 | ||
350 | *prime_fd = ret; | |
3248877e DA |
351 | mutex_unlock(&file_priv->prime.lock); |
352 | return 0; | |
219b4733 DA |
353 | |
354 | out_have_obj: | |
355 | get_dma_buf(dmabuf); | |
da34242e | 356 | ret = dma_buf_fd(dmabuf, flags); |
4a88f73f | 357 | if (ret < 0) { |
da34242e | 358 | dma_buf_put(dmabuf); |
4a88f73f | 359 | } else { |
da34242e | 360 | *prime_fd = ret; |
4a88f73f DV |
361 | ret = 0; |
362 | } | |
363 | ||
7d8f06ac YC |
364 | goto out; |
365 | ||
da34242e YC |
366 | fail_rm_handle: |
367 | drm_prime_remove_buf_handle_locked(&file_priv->prime, buf); | |
7d8f06ac YC |
368 | fail_put_dmabuf: |
369 | /* clear NOT to be checked when releasing dma_buf */ | |
370 | obj->export_dma_buf = NULL; | |
371 | dma_buf_put(buf); | |
219b4733 DA |
372 | out: |
373 | drm_gem_object_unreference_unlocked(obj); | |
374 | mutex_unlock(&file_priv->prime.lock); | |
375 | return ret; | |
3248877e DA |
376 | } |
377 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); | |
378 | ||
89177644 AP |
379 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
380 | struct dma_buf *dma_buf) | |
381 | { | |
382 | struct dma_buf_attachment *attach; | |
383 | struct sg_table *sgt; | |
384 | struct drm_gem_object *obj; | |
385 | int ret; | |
386 | ||
387 | if (!dev->driver->gem_prime_import_sg_table) | |
388 | return ERR_PTR(-EINVAL); | |
389 | ||
390 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { | |
391 | obj = dma_buf->priv; | |
392 | if (obj->dev == dev) { | |
393 | /* | |
394 | * Importing dmabuf exported from out own gem increases | |
395 | * refcount on gem itself instead of f_count of dmabuf. | |
396 | */ | |
397 | drm_gem_object_reference(obj); | |
89177644 AP |
398 | return obj; |
399 | } | |
400 | } | |
401 | ||
402 | attach = dma_buf_attach(dma_buf, dev->dev); | |
403 | if (IS_ERR(attach)) | |
f2a5da4f | 404 | return ERR_CAST(attach); |
89177644 | 405 | |
011c2282 ID |
406 | get_dma_buf(dma_buf); |
407 | ||
89177644 AP |
408 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
409 | if (IS_ERR_OR_NULL(sgt)) { | |
410 | ret = PTR_ERR(sgt); | |
411 | goto fail_detach; | |
412 | } | |
413 | ||
414 | obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt); | |
415 | if (IS_ERR(obj)) { | |
416 | ret = PTR_ERR(obj); | |
417 | goto fail_unmap; | |
418 | } | |
419 | ||
420 | obj->import_attach = attach; | |
421 | ||
422 | return obj; | |
423 | ||
424 | fail_unmap: | |
425 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); | |
426 | fail_detach: | |
427 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
428 | dma_buf_put(dma_buf); |
429 | ||
89177644 AP |
430 | return ERR_PTR(ret); |
431 | } | |
432 | EXPORT_SYMBOL(drm_gem_prime_import); | |
433 | ||
3248877e DA |
434 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
435 | struct drm_file *file_priv, int prime_fd, uint32_t *handle) | |
436 | { | |
437 | struct dma_buf *dma_buf; | |
438 | struct drm_gem_object *obj; | |
439 | int ret; | |
440 | ||
441 | dma_buf = dma_buf_get(prime_fd); | |
442 | if (IS_ERR(dma_buf)) | |
443 | return PTR_ERR(dma_buf); | |
444 | ||
445 | mutex_lock(&file_priv->prime.lock); | |
446 | ||
219b4733 | 447 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
3248877e DA |
448 | dma_buf, handle); |
449 | if (!ret) { | |
450 | ret = 0; | |
451 | goto out_put; | |
452 | } | |
453 | ||
454 | /* never seen this one, need to import */ | |
455 | obj = dev->driver->gem_prime_import(dev, dma_buf); | |
456 | if (IS_ERR(obj)) { | |
457 | ret = PTR_ERR(obj); | |
458 | goto out_put; | |
459 | } | |
460 | ||
461 | ret = drm_gem_handle_create(file_priv, obj, handle); | |
462 | drm_gem_object_unreference_unlocked(obj); | |
463 | if (ret) | |
464 | goto out_put; | |
465 | ||
219b4733 | 466 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
3248877e DA |
467 | dma_buf, *handle); |
468 | if (ret) | |
469 | goto fail; | |
470 | ||
471 | mutex_unlock(&file_priv->prime.lock); | |
011c2282 ID |
472 | |
473 | dma_buf_put(dma_buf); | |
474 | ||
3248877e DA |
475 | return 0; |
476 | ||
477 | fail: | |
478 | /* hmm, if driver attached, we are relying on the free-object path | |
479 | * to detach.. which seems ok.. | |
480 | */ | |
481 | drm_gem_object_handle_unreference_unlocked(obj); | |
482 | out_put: | |
483 | dma_buf_put(dma_buf); | |
484 | mutex_unlock(&file_priv->prime.lock); | |
485 | return ret; | |
486 | } | |
487 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); | |
488 | ||
489 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
490 | struct drm_file *file_priv) | |
491 | { | |
492 | struct drm_prime_handle *args = data; | |
493 | uint32_t flags; | |
494 | ||
495 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
496 | return -EINVAL; | |
497 | ||
498 | if (!dev->driver->prime_handle_to_fd) | |
499 | return -ENOSYS; | |
500 | ||
501 | /* check flags are valid */ | |
502 | if (args->flags & ~DRM_CLOEXEC) | |
503 | return -EINVAL; | |
504 | ||
505 | /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */ | |
506 | flags = args->flags & DRM_CLOEXEC; | |
507 | ||
508 | return dev->driver->prime_handle_to_fd(dev, file_priv, | |
509 | args->handle, flags, &args->fd); | |
510 | } | |
511 | ||
512 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
513 | struct drm_file *file_priv) | |
514 | { | |
515 | struct drm_prime_handle *args = data; | |
516 | ||
517 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
518 | return -EINVAL; | |
519 | ||
520 | if (!dev->driver->prime_fd_to_handle) | |
521 | return -ENOSYS; | |
522 | ||
523 | return dev->driver->prime_fd_to_handle(dev, file_priv, | |
524 | args->fd, &args->handle); | |
525 | } | |
526 | ||
527 | /* | |
528 | * drm_prime_pages_to_sg | |
529 | * | |
530 | * this helper creates an sg table object from a set of pages | |
531 | * the driver is responsible for mapping the pages into the | |
532 | * importers address space | |
533 | */ | |
534 | struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages) | |
535 | { | |
536 | struct sg_table *sg = NULL; | |
3248877e DA |
537 | int ret; |
538 | ||
539 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
7e3d88f9 YC |
540 | if (!sg) { |
541 | ret = -ENOMEM; | |
3248877e | 542 | goto out; |
7e3d88f9 | 543 | } |
3248877e | 544 | |
dca25cb8 RS |
545 | ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
546 | nr_pages << PAGE_SHIFT, GFP_KERNEL); | |
3248877e DA |
547 | if (ret) |
548 | goto out; | |
549 | ||
3248877e DA |
550 | return sg; |
551 | out: | |
552 | kfree(sg); | |
7e3d88f9 | 553 | return ERR_PTR(ret); |
3248877e DA |
554 | } |
555 | EXPORT_SYMBOL(drm_prime_pages_to_sg); | |
556 | ||
51ab7ba2 DA |
557 | /* export an sg table into an array of pages and addresses |
558 | this is currently required by the TTM driver in order to do correct fault | |
559 | handling */ | |
560 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, | |
561 | dma_addr_t *addrs, int max_pages) | |
562 | { | |
563 | unsigned count; | |
564 | struct scatterlist *sg; | |
565 | struct page *page; | |
566 | u32 len, offset; | |
567 | int pg_index; | |
568 | dma_addr_t addr; | |
569 | ||
570 | pg_index = 0; | |
571 | for_each_sg(sgt->sgl, sg, sgt->nents, count) { | |
572 | len = sg->length; | |
573 | offset = sg->offset; | |
574 | page = sg_page(sg); | |
575 | addr = sg_dma_address(sg); | |
576 | ||
577 | while (len > 0) { | |
578 | if (WARN_ON(pg_index >= max_pages)) | |
579 | return -1; | |
580 | pages[pg_index] = page; | |
581 | if (addrs) | |
582 | addrs[pg_index] = addr; | |
583 | ||
584 | page++; | |
585 | addr += PAGE_SIZE; | |
586 | len -= PAGE_SIZE; | |
587 | pg_index++; | |
588 | } | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); | |
3248877e DA |
593 | /* helper function to cleanup a GEM/prime object */ |
594 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) | |
595 | { | |
596 | struct dma_buf_attachment *attach; | |
597 | struct dma_buf *dma_buf; | |
598 | attach = obj->import_attach; | |
599 | if (sg) | |
600 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
601 | dma_buf = attach->dmabuf; | |
602 | dma_buf_detach(attach->dmabuf, attach); | |
603 | /* remove the reference */ | |
604 | dma_buf_put(dma_buf); | |
605 | } | |
606 | EXPORT_SYMBOL(drm_prime_gem_destroy); | |
607 | ||
608 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) | |
609 | { | |
610 | INIT_LIST_HEAD(&prime_fpriv->head); | |
611 | mutex_init(&prime_fpriv->lock); | |
612 | } | |
613 | EXPORT_SYMBOL(drm_prime_init_file_private); | |
614 | ||
615 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) | |
616 | { | |
98b76231 ID |
617 | /* by now drm_gem_release should've made sure the list is empty */ |
618 | WARN_ON(!list_empty(&prime_fpriv->head)); | |
3248877e DA |
619 | } |
620 | EXPORT_SYMBOL(drm_prime_destroy_file_private); | |
621 | ||
219b4733 | 622 | int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle) |
3248877e DA |
623 | { |
624 | struct drm_prime_member *member; | |
625 | ||
626 | list_for_each_entry(member, &prime_fpriv->head, entry) { | |
627 | if (member->dma_buf == dma_buf) { | |
628 | *handle = member->handle; | |
629 | return 0; | |
630 | } | |
631 | } | |
632 | return -ENOENT; | |
633 | } | |
219b4733 | 634 | EXPORT_SYMBOL(drm_prime_lookup_buf_handle); |
3248877e | 635 | |
219b4733 | 636 | void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf) |
3248877e | 637 | { |
3248877e | 638 | mutex_lock(&prime_fpriv->lock); |
da34242e | 639 | drm_prime_remove_buf_handle_locked(prime_fpriv, dma_buf); |
3248877e DA |
640 | mutex_unlock(&prime_fpriv->lock); |
641 | } | |
219b4733 | 642 | EXPORT_SYMBOL(drm_prime_remove_buf_handle); |