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 | ||
219b4733 | 71 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle); |
3248877e | 72 | |
ca793f75 ML |
73 | static int drm_gem_map_attach(struct dma_buf *dma_buf, |
74 | struct device *target_dev, | |
75 | struct dma_buf_attachment *attach) | |
76 | { | |
538d6661 | 77 | struct drm_prime_attachment *prime_attach; |
ca793f75 ML |
78 | struct drm_gem_object *obj = dma_buf->priv; |
79 | struct drm_device *dev = obj->dev; | |
80 | ||
538d6661 JS |
81 | prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL); |
82 | if (!prime_attach) | |
83 | return -ENOMEM; | |
84 | ||
85 | prime_attach->dir = DMA_NONE; | |
86 | attach->priv = prime_attach; | |
87 | ||
ca793f75 ML |
88 | if (!dev->driver->gem_prime_pin) |
89 | return 0; | |
90 | ||
91 | return dev->driver->gem_prime_pin(obj); | |
92 | } | |
93 | ||
94 | static void drm_gem_map_detach(struct dma_buf *dma_buf, | |
95 | struct dma_buf_attachment *attach) | |
96 | { | |
538d6661 | 97 | struct drm_prime_attachment *prime_attach = attach->priv; |
ca793f75 ML |
98 | struct drm_gem_object *obj = dma_buf->priv; |
99 | struct drm_device *dev = obj->dev; | |
538d6661 | 100 | struct sg_table *sgt; |
ca793f75 ML |
101 | |
102 | if (dev->driver->gem_prime_unpin) | |
103 | dev->driver->gem_prime_unpin(obj); | |
538d6661 JS |
104 | |
105 | if (!prime_attach) | |
106 | return; | |
107 | ||
108 | sgt = prime_attach->sgt; | |
109 | ||
110 | if (prime_attach->dir != DMA_NONE) | |
111 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, | |
112 | prime_attach->dir); | |
113 | ||
114 | sg_free_table(sgt); | |
115 | kfree(sgt); | |
116 | kfree(prime_attach); | |
117 | attach->priv = NULL; | |
ca793f75 ML |
118 | } |
119 | ||
89177644 AP |
120 | static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
121 | enum dma_data_direction dir) | |
122 | { | |
538d6661 | 123 | struct drm_prime_attachment *prime_attach = attach->priv; |
89177644 AP |
124 | struct drm_gem_object *obj = attach->dmabuf->priv; |
125 | struct sg_table *sgt; | |
126 | ||
538d6661 JS |
127 | if (WARN_ON(dir == DMA_NONE || !prime_attach)) |
128 | return ERR_PTR(-EINVAL); | |
129 | ||
130 | /* return the cached mapping when possible */ | |
131 | if (prime_attach->dir == dir) | |
132 | return prime_attach->sgt; | |
133 | ||
134 | /* | |
135 | * two mappings with different directions for the same attachment are | |
136 | * not allowed | |
137 | */ | |
138 | if (WARN_ON(prime_attach->dir != DMA_NONE)) | |
139 | return ERR_PTR(-EBUSY); | |
140 | ||
89177644 AP |
141 | mutex_lock(&obj->dev->struct_mutex); |
142 | ||
143 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); | |
144 | ||
7e3d88f9 | 145 | if (!IS_ERR(sgt)) { |
b720d54a YC |
146 | if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) { |
147 | sg_free_table(sgt); | |
148 | kfree(sgt); | |
149 | sgt = ERR_PTR(-ENOMEM); | |
538d6661 JS |
150 | } else { |
151 | prime_attach->sgt = sgt; | |
152 | prime_attach->dir = dir; | |
b720d54a YC |
153 | } |
154 | } | |
89177644 AP |
155 | |
156 | mutex_unlock(&obj->dev->struct_mutex); | |
157 | return sgt; | |
158 | } | |
159 | ||
160 | static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, | |
161 | struct sg_table *sgt, enum dma_data_direction dir) | |
162 | { | |
538d6661 | 163 | /* nothing to be done here */ |
89177644 AP |
164 | } |
165 | ||
166 | static void drm_gem_dmabuf_release(struct dma_buf *dma_buf) | |
167 | { | |
168 | struct drm_gem_object *obj = dma_buf->priv; | |
169 | ||
170 | if (obj->export_dma_buf == dma_buf) { | |
171 | /* drop the reference on the export fd holds */ | |
172 | obj->export_dma_buf = NULL; | |
173 | drm_gem_object_unreference_unlocked(obj); | |
174 | } | |
175 | } | |
176 | ||
177 | static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) | |
178 | { | |
179 | struct drm_gem_object *obj = dma_buf->priv; | |
180 | struct drm_device *dev = obj->dev; | |
181 | ||
182 | return dev->driver->gem_prime_vmap(obj); | |
183 | } | |
184 | ||
185 | static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) | |
186 | { | |
187 | struct drm_gem_object *obj = dma_buf->priv; | |
188 | struct drm_device *dev = obj->dev; | |
189 | ||
190 | dev->driver->gem_prime_vunmap(obj, vaddr); | |
191 | } | |
192 | ||
193 | static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, | |
194 | unsigned long page_num) | |
195 | { | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, | |
200 | unsigned long page_num, void *addr) | |
201 | { | |
202 | ||
203 | } | |
204 | static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, | |
205 | unsigned long page_num) | |
206 | { | |
207 | return NULL; | |
208 | } | |
209 | ||
210 | static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, | |
211 | unsigned long page_num, void *addr) | |
212 | { | |
213 | ||
214 | } | |
215 | ||
216 | static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, | |
217 | struct vm_area_struct *vma) | |
218 | { | |
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { | |
ca793f75 ML |
223 | .attach = drm_gem_map_attach, |
224 | .detach = drm_gem_map_detach, | |
89177644 AP |
225 | .map_dma_buf = drm_gem_map_dma_buf, |
226 | .unmap_dma_buf = drm_gem_unmap_dma_buf, | |
227 | .release = drm_gem_dmabuf_release, | |
228 | .kmap = drm_gem_dmabuf_kmap, | |
229 | .kmap_atomic = drm_gem_dmabuf_kmap_atomic, | |
230 | .kunmap = drm_gem_dmabuf_kunmap, | |
231 | .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic, | |
232 | .mmap = drm_gem_dmabuf_mmap, | |
233 | .vmap = drm_gem_dmabuf_vmap, | |
234 | .vunmap = drm_gem_dmabuf_vunmap, | |
235 | }; | |
236 | ||
237 | /** | |
238 | * DOC: PRIME Helpers | |
239 | * | |
240 | * Drivers can implement @gem_prime_export and @gem_prime_import in terms of | |
241 | * simpler APIs by using the helper functions @drm_gem_prime_export and | |
242 | * @drm_gem_prime_import. These functions implement dma-buf support in terms of | |
243 | * five lower-level driver callbacks: | |
244 | * | |
245 | * Export callbacks: | |
246 | * | |
247 | * - @gem_prime_pin (optional): prepare a GEM object for exporting | |
248 | * | |
249 | * - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages | |
250 | * | |
251 | * - @gem_prime_vmap: vmap a buffer exported by your driver | |
252 | * | |
253 | * - @gem_prime_vunmap: vunmap a buffer exported by your driver | |
254 | * | |
255 | * Import callback: | |
256 | * | |
257 | * - @gem_prime_import_sg_table (import): produce a GEM object from another | |
258 | * driver's scatter/gather table | |
259 | */ | |
260 | ||
261 | struct dma_buf *drm_gem_prime_export(struct drm_device *dev, | |
262 | struct drm_gem_object *obj, int flags) | |
263 | { | |
ebc0bad4 | 264 | return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, flags); |
89177644 AP |
265 | } |
266 | EXPORT_SYMBOL(drm_gem_prime_export); | |
267 | ||
3248877e DA |
268 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
269 | struct drm_file *file_priv, uint32_t handle, uint32_t flags, | |
270 | int *prime_fd) | |
271 | { | |
272 | struct drm_gem_object *obj; | |
273 | void *buf; | |
219b4733 DA |
274 | int ret = 0; |
275 | struct dma_buf *dmabuf; | |
3248877e DA |
276 | |
277 | obj = drm_gem_object_lookup(dev, file_priv, handle); | |
278 | if (!obj) | |
279 | return -ENOENT; | |
280 | ||
281 | mutex_lock(&file_priv->prime.lock); | |
282 | /* re-export the original imported object */ | |
283 | if (obj->import_attach) { | |
219b4733 DA |
284 | dmabuf = obj->import_attach->dmabuf; |
285 | goto out_have_obj; | |
3248877e DA |
286 | } |
287 | ||
288 | if (obj->export_dma_buf) { | |
219b4733 DA |
289 | dmabuf = obj->export_dma_buf; |
290 | goto out_have_obj; | |
3248877e | 291 | } |
219b4733 DA |
292 | |
293 | buf = dev->driver->gem_prime_export(dev, obj, flags); | |
294 | if (IS_ERR(buf)) { | |
295 | /* normally the created dma-buf takes ownership of the ref, | |
296 | * but if that fails then drop the ref | |
297 | */ | |
298 | ret = PTR_ERR(buf); | |
299 | goto out; | |
300 | } | |
301 | obj->export_dma_buf = buf; | |
302 | ||
0ff926c7 DA |
303 | /* if we've exported this buffer the cheat and add it to the import list |
304 | * so we get the correct handle back | |
305 | */ | |
219b4733 DA |
306 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
307 | obj->export_dma_buf, handle); | |
308 | if (ret) | |
309 | goto out; | |
0ff926c7 | 310 | |
219b4733 | 311 | *prime_fd = dma_buf_fd(buf, flags); |
3248877e DA |
312 | mutex_unlock(&file_priv->prime.lock); |
313 | return 0; | |
219b4733 DA |
314 | |
315 | out_have_obj: | |
316 | get_dma_buf(dmabuf); | |
317 | *prime_fd = dma_buf_fd(dmabuf, flags); | |
318 | out: | |
319 | drm_gem_object_unreference_unlocked(obj); | |
320 | mutex_unlock(&file_priv->prime.lock); | |
321 | return ret; | |
3248877e DA |
322 | } |
323 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); | |
324 | ||
89177644 AP |
325 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
326 | struct dma_buf *dma_buf) | |
327 | { | |
328 | struct dma_buf_attachment *attach; | |
329 | struct sg_table *sgt; | |
330 | struct drm_gem_object *obj; | |
331 | int ret; | |
332 | ||
333 | if (!dev->driver->gem_prime_import_sg_table) | |
334 | return ERR_PTR(-EINVAL); | |
335 | ||
336 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { | |
337 | obj = dma_buf->priv; | |
338 | if (obj->dev == dev) { | |
339 | /* | |
340 | * Importing dmabuf exported from out own gem increases | |
341 | * refcount on gem itself instead of f_count of dmabuf. | |
342 | */ | |
343 | drm_gem_object_reference(obj); | |
89177644 AP |
344 | return obj; |
345 | } | |
346 | } | |
347 | ||
348 | attach = dma_buf_attach(dma_buf, dev->dev); | |
349 | if (IS_ERR(attach)) | |
f2a5da4f | 350 | return ERR_CAST(attach); |
89177644 | 351 | |
011c2282 ID |
352 | get_dma_buf(dma_buf); |
353 | ||
89177644 AP |
354 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
355 | if (IS_ERR_OR_NULL(sgt)) { | |
356 | ret = PTR_ERR(sgt); | |
357 | goto fail_detach; | |
358 | } | |
359 | ||
360 | obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt); | |
361 | if (IS_ERR(obj)) { | |
362 | ret = PTR_ERR(obj); | |
363 | goto fail_unmap; | |
364 | } | |
365 | ||
366 | obj->import_attach = attach; | |
367 | ||
368 | return obj; | |
369 | ||
370 | fail_unmap: | |
371 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); | |
372 | fail_detach: | |
373 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
374 | dma_buf_put(dma_buf); |
375 | ||
89177644 AP |
376 | return ERR_PTR(ret); |
377 | } | |
378 | EXPORT_SYMBOL(drm_gem_prime_import); | |
379 | ||
3248877e DA |
380 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
381 | struct drm_file *file_priv, int prime_fd, uint32_t *handle) | |
382 | { | |
383 | struct dma_buf *dma_buf; | |
384 | struct drm_gem_object *obj; | |
385 | int ret; | |
386 | ||
387 | dma_buf = dma_buf_get(prime_fd); | |
388 | if (IS_ERR(dma_buf)) | |
389 | return PTR_ERR(dma_buf); | |
390 | ||
391 | mutex_lock(&file_priv->prime.lock); | |
392 | ||
219b4733 | 393 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
3248877e DA |
394 | dma_buf, handle); |
395 | if (!ret) { | |
396 | ret = 0; | |
397 | goto out_put; | |
398 | } | |
399 | ||
400 | /* never seen this one, need to import */ | |
401 | obj = dev->driver->gem_prime_import(dev, dma_buf); | |
402 | if (IS_ERR(obj)) { | |
403 | ret = PTR_ERR(obj); | |
404 | goto out_put; | |
405 | } | |
406 | ||
407 | ret = drm_gem_handle_create(file_priv, obj, handle); | |
408 | drm_gem_object_unreference_unlocked(obj); | |
409 | if (ret) | |
410 | goto out_put; | |
411 | ||
219b4733 | 412 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
3248877e DA |
413 | dma_buf, *handle); |
414 | if (ret) | |
415 | goto fail; | |
416 | ||
417 | mutex_unlock(&file_priv->prime.lock); | |
011c2282 ID |
418 | |
419 | dma_buf_put(dma_buf); | |
420 | ||
3248877e DA |
421 | return 0; |
422 | ||
423 | fail: | |
424 | /* hmm, if driver attached, we are relying on the free-object path | |
425 | * to detach.. which seems ok.. | |
426 | */ | |
427 | drm_gem_object_handle_unreference_unlocked(obj); | |
428 | out_put: | |
429 | dma_buf_put(dma_buf); | |
430 | mutex_unlock(&file_priv->prime.lock); | |
431 | return ret; | |
432 | } | |
433 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); | |
434 | ||
435 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
436 | struct drm_file *file_priv) | |
437 | { | |
438 | struct drm_prime_handle *args = data; | |
439 | uint32_t flags; | |
440 | ||
441 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
442 | return -EINVAL; | |
443 | ||
444 | if (!dev->driver->prime_handle_to_fd) | |
445 | return -ENOSYS; | |
446 | ||
447 | /* check flags are valid */ | |
448 | if (args->flags & ~DRM_CLOEXEC) | |
449 | return -EINVAL; | |
450 | ||
451 | /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */ | |
452 | flags = args->flags & DRM_CLOEXEC; | |
453 | ||
454 | return dev->driver->prime_handle_to_fd(dev, file_priv, | |
455 | args->handle, flags, &args->fd); | |
456 | } | |
457 | ||
458 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
459 | struct drm_file *file_priv) | |
460 | { | |
461 | struct drm_prime_handle *args = data; | |
462 | ||
463 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) | |
464 | return -EINVAL; | |
465 | ||
466 | if (!dev->driver->prime_fd_to_handle) | |
467 | return -ENOSYS; | |
468 | ||
469 | return dev->driver->prime_fd_to_handle(dev, file_priv, | |
470 | args->fd, &args->handle); | |
471 | } | |
472 | ||
473 | /* | |
474 | * drm_prime_pages_to_sg | |
475 | * | |
476 | * this helper creates an sg table object from a set of pages | |
477 | * the driver is responsible for mapping the pages into the | |
478 | * importers address space | |
479 | */ | |
480 | struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages) | |
481 | { | |
482 | struct sg_table *sg = NULL; | |
3248877e DA |
483 | int ret; |
484 | ||
485 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); | |
7e3d88f9 YC |
486 | if (!sg) { |
487 | ret = -ENOMEM; | |
3248877e | 488 | goto out; |
7e3d88f9 | 489 | } |
3248877e | 490 | |
dca25cb8 RS |
491 | ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
492 | nr_pages << PAGE_SHIFT, GFP_KERNEL); | |
3248877e DA |
493 | if (ret) |
494 | goto out; | |
495 | ||
3248877e DA |
496 | return sg; |
497 | out: | |
498 | kfree(sg); | |
7e3d88f9 | 499 | return ERR_PTR(ret); |
3248877e DA |
500 | } |
501 | EXPORT_SYMBOL(drm_prime_pages_to_sg); | |
502 | ||
51ab7ba2 DA |
503 | /* export an sg table into an array of pages and addresses |
504 | this is currently required by the TTM driver in order to do correct fault | |
505 | handling */ | |
506 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, | |
507 | dma_addr_t *addrs, int max_pages) | |
508 | { | |
509 | unsigned count; | |
510 | struct scatterlist *sg; | |
511 | struct page *page; | |
512 | u32 len, offset; | |
513 | int pg_index; | |
514 | dma_addr_t addr; | |
515 | ||
516 | pg_index = 0; | |
517 | for_each_sg(sgt->sgl, sg, sgt->nents, count) { | |
518 | len = sg->length; | |
519 | offset = sg->offset; | |
520 | page = sg_page(sg); | |
521 | addr = sg_dma_address(sg); | |
522 | ||
523 | while (len > 0) { | |
524 | if (WARN_ON(pg_index >= max_pages)) | |
525 | return -1; | |
526 | pages[pg_index] = page; | |
527 | if (addrs) | |
528 | addrs[pg_index] = addr; | |
529 | ||
530 | page++; | |
531 | addr += PAGE_SIZE; | |
532 | len -= PAGE_SIZE; | |
533 | pg_index++; | |
534 | } | |
535 | } | |
536 | return 0; | |
537 | } | |
538 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); | |
3248877e DA |
539 | /* helper function to cleanup a GEM/prime object */ |
540 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) | |
541 | { | |
542 | struct dma_buf_attachment *attach; | |
543 | struct dma_buf *dma_buf; | |
544 | attach = obj->import_attach; | |
545 | if (sg) | |
546 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
547 | dma_buf = attach->dmabuf; | |
548 | dma_buf_detach(attach->dmabuf, attach); | |
549 | /* remove the reference */ | |
550 | dma_buf_put(dma_buf); | |
551 | } | |
552 | EXPORT_SYMBOL(drm_prime_gem_destroy); | |
553 | ||
554 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) | |
555 | { | |
556 | INIT_LIST_HEAD(&prime_fpriv->head); | |
557 | mutex_init(&prime_fpriv->lock); | |
558 | } | |
559 | EXPORT_SYMBOL(drm_prime_init_file_private); | |
560 | ||
561 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) | |
562 | { | |
98b76231 ID |
563 | /* by now drm_gem_release should've made sure the list is empty */ |
564 | WARN_ON(!list_empty(&prime_fpriv->head)); | |
3248877e DA |
565 | } |
566 | EXPORT_SYMBOL(drm_prime_destroy_file_private); | |
567 | ||
219b4733 | 568 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle) |
3248877e DA |
569 | { |
570 | struct drm_prime_member *member; | |
571 | ||
572 | member = kmalloc(sizeof(*member), GFP_KERNEL); | |
573 | if (!member) | |
574 | return -ENOMEM; | |
575 | ||
219b4733 | 576 | get_dma_buf(dma_buf); |
3248877e DA |
577 | member->dma_buf = dma_buf; |
578 | member->handle = handle; | |
579 | list_add(&member->entry, &prime_fpriv->head); | |
580 | return 0; | |
581 | } | |
3248877e | 582 | |
219b4733 | 583 | int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle) |
3248877e DA |
584 | { |
585 | struct drm_prime_member *member; | |
586 | ||
587 | list_for_each_entry(member, &prime_fpriv->head, entry) { | |
588 | if (member->dma_buf == dma_buf) { | |
589 | *handle = member->handle; | |
590 | return 0; | |
591 | } | |
592 | } | |
593 | return -ENOENT; | |
594 | } | |
219b4733 | 595 | EXPORT_SYMBOL(drm_prime_lookup_buf_handle); |
3248877e | 596 | |
219b4733 | 597 | void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf) |
3248877e DA |
598 | { |
599 | struct drm_prime_member *member, *safe; | |
600 | ||
601 | mutex_lock(&prime_fpriv->lock); | |
602 | list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) { | |
603 | if (member->dma_buf == dma_buf) { | |
219b4733 | 604 | dma_buf_put(dma_buf); |
3248877e DA |
605 | list_del(&member->entry); |
606 | kfree(member); | |
607 | } | |
608 | } | |
609 | mutex_unlock(&prime_fpriv->lock); | |
610 | } | |
219b4733 | 611 | EXPORT_SYMBOL(drm_prime_remove_buf_handle); |