File: | dev/pci/drm/drm_prime.c |
Warning: | line 992, column 2 Value stored to 'ret' is never read |
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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> |
31 | #include <linux/rbtree.h> |
32 | |
33 | #include <drm/drm.h> |
34 | #include <drm/drm_drv.h> |
35 | #include <drm/drm_file.h> |
36 | #include <drm/drm_framebuffer.h> |
37 | #include <drm/drm_gem.h> |
38 | #include <drm/drm_prime.h> |
39 | |
40 | #include "drm_internal.h" |
41 | |
42 | /** |
43 | * DOC: overview and lifetime rules |
44 | * |
45 | * Similar to GEM global names, PRIME file descriptors are also used to share |
46 | * buffer objects across processes. They offer additional security: as file |
47 | * descriptors must be explicitly sent over UNIX domain sockets to be shared |
48 | * between applications, they can't be guessed like the globally unique GEM |
49 | * names. |
50 | * |
51 | * Drivers that support the PRIME API implement the |
52 | * &drm_driver.prime_handle_to_fd and &drm_driver.prime_fd_to_handle operations. |
53 | * GEM based drivers must use drm_gem_prime_handle_to_fd() and |
54 | * drm_gem_prime_fd_to_handle() to implement these. For GEM based drivers the |
55 | * actual driver interfaces is provided through the &drm_gem_object_funcs.export |
56 | * and &drm_driver.gem_prime_import hooks. |
57 | * |
58 | * &dma_buf_ops implementations for GEM drivers are all individually exported |
59 | * for drivers which need to overwrite or reimplement some of them. |
60 | * |
61 | * Reference Counting for GEM Drivers |
62 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
63 | * |
64 | * On the export the &dma_buf holds a reference to the exported buffer object, |
65 | * usually a &drm_gem_object. It takes this reference in the PRIME_HANDLE_TO_FD |
66 | * IOCTL, when it first calls &drm_gem_object_funcs.export |
67 | * and stores the exporting GEM object in the &dma_buf.priv field. This |
68 | * reference needs to be released when the final reference to the &dma_buf |
69 | * itself is dropped and its &dma_buf_ops.release function is called. For |
70 | * GEM-based drivers, the &dma_buf should be exported using |
71 | * drm_gem_dmabuf_export() and then released by drm_gem_dmabuf_release(). |
72 | * |
73 | * Thus the chain of references always flows in one direction, avoiding loops: |
74 | * importing GEM object -> dma-buf -> exported GEM bo. A further complication |
75 | * are the lookup caches for import and export. These are required to guarantee |
76 | * that any given object will always have only one uniqe userspace handle. This |
77 | * is required to allow userspace to detect duplicated imports, since some GEM |
78 | * drivers do fail command submissions if a given buffer object is listed more |
79 | * than once. These import and export caches in &drm_prime_file_private only |
80 | * retain a weak reference, which is cleaned up when the corresponding object is |
81 | * released. |
82 | * |
83 | * Self-importing: If userspace is using PRIME as a replacement for flink then |
84 | * it will get a fd->handle request for a GEM object that it created. Drivers |
85 | * should detect this situation and return back the underlying object from the |
86 | * dma-buf private. For GEM based drivers this is handled in |
87 | * drm_gem_prime_import() already. |
88 | */ |
89 | |
90 | struct drm_prime_member { |
91 | struct dma_buf *dma_buf; |
92 | uint32_t handle; |
93 | |
94 | struct rb_node dmabuf_rb; |
95 | struct rb_node handle_rb; |
96 | }; |
97 | |
98 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, |
99 | struct dma_buf *dma_buf, uint32_t handle) |
100 | { |
101 | struct drm_prime_member *member; |
102 | struct rb_node **p, *rb; |
103 | |
104 | member = kmalloc(sizeof(*member), GFP_KERNEL(0x0001 | 0x0004)); |
105 | if (!member) |
106 | return -ENOMEM12; |
107 | |
108 | get_dma_buf(dma_buf); |
109 | member->dma_buf = dma_buf; |
110 | member->handle = handle; |
111 | |
112 | rb = NULL((void *)0); |
113 | p = &prime_fpriv->dmabufs.rb_node; |
114 | while (*p) { |
115 | struct drm_prime_member *pos; |
116 | |
117 | rb = *p; |
118 | pos = rb_entry(rb, struct drm_prime_member, dmabuf_rb)({ const __typeof( ((struct drm_prime_member *)0)->dmabuf_rb ) *__mptr = (rb); (struct drm_prime_member *)( (char *)__mptr - __builtin_offsetof(struct drm_prime_member, dmabuf_rb) );} ); |
119 | if (dma_buf > pos->dma_buf) |
120 | p = &rb->rb_right__entry.rbe_right; |
121 | else |
122 | p = &rb->rb_left__entry.rbe_left; |
123 | } |
124 | rb_link_node(&member->dmabuf_rb, rb, p); |
125 | rb_insert_color(&member->dmabuf_rb, &prime_fpriv->dmabufs)linux_root_RB_INSERT_COLOR((struct linux_root *)(&prime_fpriv ->dmabufs), (&member->dmabuf_rb)); |
126 | |
127 | rb = NULL((void *)0); |
128 | p = &prime_fpriv->handles.rb_node; |
129 | while (*p) { |
130 | struct drm_prime_member *pos; |
131 | |
132 | rb = *p; |
133 | pos = rb_entry(rb, struct drm_prime_member, handle_rb)({ const __typeof( ((struct drm_prime_member *)0)->handle_rb ) *__mptr = (rb); (struct drm_prime_member *)( (char *)__mptr - __builtin_offsetof(struct drm_prime_member, handle_rb) );} ); |
134 | if (handle > pos->handle) |
135 | p = &rb->rb_right__entry.rbe_right; |
136 | else |
137 | p = &rb->rb_left__entry.rbe_left; |
138 | } |
139 | rb_link_node(&member->handle_rb, rb, p); |
140 | rb_insert_color(&member->handle_rb, &prime_fpriv->handles)linux_root_RB_INSERT_COLOR((struct linux_root *)(&prime_fpriv ->handles), (&member->handle_rb)); |
141 | |
142 | return 0; |
143 | } |
144 | |
145 | static struct dma_buf *drm_prime_lookup_buf_by_handle(struct drm_prime_file_private *prime_fpriv, |
146 | uint32_t handle) |
147 | { |
148 | struct rb_node *rb; |
149 | |
150 | rb = prime_fpriv->handles.rb_node; |
151 | while (rb) { |
152 | struct drm_prime_member *member; |
153 | |
154 | member = rb_entry(rb, struct drm_prime_member, handle_rb)({ const __typeof( ((struct drm_prime_member *)0)->handle_rb ) *__mptr = (rb); (struct drm_prime_member *)( (char *)__mptr - __builtin_offsetof(struct drm_prime_member, handle_rb) );} ); |
155 | if (member->handle == handle) |
156 | return member->dma_buf; |
157 | else if (member->handle < handle) |
158 | rb = rb->rb_right__entry.rbe_right; |
159 | else |
160 | rb = rb->rb_left__entry.rbe_left; |
161 | } |
162 | |
163 | return NULL((void *)0); |
164 | } |
165 | |
166 | static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, |
167 | struct dma_buf *dma_buf, |
168 | uint32_t *handle) |
169 | { |
170 | struct rb_node *rb; |
171 | |
172 | rb = prime_fpriv->dmabufs.rb_node; |
173 | while (rb) { |
174 | struct drm_prime_member *member; |
175 | |
176 | member = rb_entry(rb, struct drm_prime_member, dmabuf_rb)({ const __typeof( ((struct drm_prime_member *)0)->dmabuf_rb ) *__mptr = (rb); (struct drm_prime_member *)( (char *)__mptr - __builtin_offsetof(struct drm_prime_member, dmabuf_rb) );} ); |
177 | if (member->dma_buf == dma_buf) { |
178 | *handle = member->handle; |
179 | return 0; |
180 | } else if (member->dma_buf < dma_buf) { |
181 | rb = rb->rb_right__entry.rbe_right; |
182 | } else { |
183 | rb = rb->rb_left__entry.rbe_left; |
184 | } |
185 | } |
186 | |
187 | return -ENOENT2; |
188 | } |
189 | |
190 | void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, |
191 | struct dma_buf *dma_buf) |
192 | { |
193 | struct rb_node *rb; |
194 | |
195 | rb = prime_fpriv->dmabufs.rb_node; |
196 | while (rb) { |
197 | struct drm_prime_member *member; |
198 | |
199 | member = rb_entry(rb, struct drm_prime_member, dmabuf_rb)({ const __typeof( ((struct drm_prime_member *)0)->dmabuf_rb ) *__mptr = (rb); (struct drm_prime_member *)( (char *)__mptr - __builtin_offsetof(struct drm_prime_member, dmabuf_rb) );} ); |
200 | if (member->dma_buf == dma_buf) { |
201 | rb_erase(&member->handle_rb, &prime_fpriv->handles)linux_root_RB_REMOVE((struct linux_root *)(&prime_fpriv-> handles), (&member->handle_rb)); |
202 | rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs)linux_root_RB_REMOVE((struct linux_root *)(&prime_fpriv-> dmabufs), (&member->dmabuf_rb)); |
203 | |
204 | dma_buf_put(dma_buf); |
205 | kfree(member); |
206 | return; |
207 | } else if (member->dma_buf < dma_buf) { |
208 | rb = rb->rb_right__entry.rbe_right; |
209 | } else { |
210 | rb = rb->rb_left__entry.rbe_left; |
211 | } |
212 | } |
213 | } |
214 | |
215 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) |
216 | { |
217 | rw_init(&prime_fpriv->lock, "primlk")_rw_init_flags(&prime_fpriv->lock, "primlk", 0, ((void *)0)); |
218 | prime_fpriv->dmabufs = RB_ROOT(struct rb_root) { ((void *)0) }; |
219 | prime_fpriv->handles = RB_ROOT(struct rb_root) { ((void *)0) }; |
220 | } |
221 | |
222 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) |
223 | { |
224 | /* by now drm_gem_release should've made sure the list is empty */ |
225 | WARN_ON(!RB_EMPTY_ROOT(&prime_fpriv->dmabufs))({ int __ret = !!(!((&prime_fpriv->dmabufs)->rb_node == ((void *)0))); if (__ret) printf("WARNING %s failed at %s:%d\n" , "!((&prime_fpriv->dmabufs)->rb_node == ((void *)0))" , "/usr/src/sys/dev/pci/drm/drm_prime.c", 225); __builtin_expect (!!(__ret), 0); }); |
226 | } |
227 | |
228 | /** |
229 | * drm_gem_dmabuf_export - &dma_buf export implementation for GEM |
230 | * @dev: parent device for the exported dmabuf |
231 | * @exp_info: the export information used by dma_buf_export() |
232 | * |
233 | * This wraps dma_buf_export() for use by generic GEM drivers that are using |
234 | * drm_gem_dmabuf_release(). In addition to calling dma_buf_export(), we take |
235 | * a reference to the &drm_device and the exported &drm_gem_object (stored in |
236 | * &dma_buf_export_info.priv) which is released by drm_gem_dmabuf_release(). |
237 | * |
238 | * Returns the new dmabuf. |
239 | */ |
240 | struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev, |
241 | struct dma_buf_export_info *exp_info) |
242 | { |
243 | struct drm_gem_object *obj = exp_info->priv; |
244 | struct dma_buf *dma_buf; |
245 | |
246 | dma_buf = dma_buf_export(exp_info); |
247 | if (IS_ERR(dma_buf)) |
248 | return dma_buf; |
249 | |
250 | drm_dev_get(dev); |
251 | drm_gem_object_get(obj); |
252 | #ifdef __linux__ |
253 | dma_buf->file->f_mapping = obj->dev->anon_inode->i_mapping; |
254 | #endif |
255 | |
256 | return dma_buf; |
257 | } |
258 | EXPORT_SYMBOL(drm_gem_dmabuf_export); |
259 | |
260 | /** |
261 | * drm_gem_dmabuf_release - &dma_buf release implementation for GEM |
262 | * @dma_buf: buffer to be released |
263 | * |
264 | * Generic release function for dma_bufs exported as PRIME buffers. GEM drivers |
265 | * must use this in their &dma_buf_ops structure as the release callback. |
266 | * drm_gem_dmabuf_release() should be used in conjunction with |
267 | * drm_gem_dmabuf_export(). |
268 | */ |
269 | void drm_gem_dmabuf_release(struct dma_buf *dma_buf) |
270 | { |
271 | struct drm_gem_object *obj = dma_buf->priv; |
272 | struct drm_device *dev = obj->dev; |
273 | |
274 | /* drop the reference on the export fd holds */ |
275 | drm_gem_object_put(obj); |
276 | |
277 | drm_dev_put(dev); |
278 | } |
279 | EXPORT_SYMBOL(drm_gem_dmabuf_release); |
280 | |
281 | /** |
282 | * drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers |
283 | * @dev: dev to export the buffer from |
284 | * @file_priv: drm file-private structure |
285 | * @prime_fd: fd id of the dma-buf which should be imported |
286 | * @handle: pointer to storage for the handle of the imported buffer object |
287 | * |
288 | * This is the PRIME import function which must be used mandatorily by GEM |
289 | * drivers to ensure correct lifetime management of the underlying GEM object. |
290 | * The actual importing of GEM object from the dma-buf is done through the |
291 | * &drm_driver.gem_prime_import driver callback. |
292 | * |
293 | * Returns 0 on success or a negative error code on failure. |
294 | */ |
295 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
296 | struct drm_file *file_priv, int prime_fd, |
297 | uint32_t *handle) |
298 | { |
299 | struct dma_buf *dma_buf; |
300 | struct drm_gem_object *obj; |
301 | int ret; |
302 | |
303 | dma_buf = dma_buf_get(prime_fd); |
304 | if (IS_ERR(dma_buf)) |
305 | return PTR_ERR(dma_buf); |
306 | |
307 | mutex_lock(&file_priv->prime.lock)rw_enter_write(&file_priv->prime.lock); |
308 | |
309 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
310 | dma_buf, handle); |
311 | if (ret == 0) |
312 | goto out_put; |
313 | |
314 | /* never seen this one, need to import */ |
315 | mutex_lock(&dev->object_name_lock)rw_enter_write(&dev->object_name_lock); |
316 | if (dev->driver->gem_prime_import) |
317 | obj = dev->driver->gem_prime_import(dev, dma_buf); |
318 | else |
319 | obj = drm_gem_prime_import(dev, dma_buf); |
320 | if (IS_ERR(obj)) { |
321 | ret = PTR_ERR(obj); |
322 | goto out_unlock; |
323 | } |
324 | |
325 | if (obj->dma_buf) { |
326 | WARN_ON(obj->dma_buf != dma_buf)({ int __ret = !!(obj->dma_buf != dma_buf); if (__ret) printf ("WARNING %s failed at %s:%d\n", "obj->dma_buf != dma_buf" , "/usr/src/sys/dev/pci/drm/drm_prime.c", 326); __builtin_expect (!!(__ret), 0); }); |
327 | } else { |
328 | obj->dma_buf = dma_buf; |
329 | get_dma_buf(dma_buf); |
330 | } |
331 | |
332 | /* _handle_create_tail unconditionally unlocks dev->object_name_lock. */ |
333 | ret = drm_gem_handle_create_tail(file_priv, obj, handle); |
334 | drm_gem_object_put(obj); |
335 | if (ret) |
336 | goto out_put; |
337 | |
338 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
339 | dma_buf, *handle); |
340 | mutex_unlock(&file_priv->prime.lock)rw_exit_write(&file_priv->prime.lock); |
341 | if (ret) |
342 | goto fail; |
343 | |
344 | dma_buf_put(dma_buf); |
345 | |
346 | return 0; |
347 | |
348 | fail: |
349 | /* hmm, if driver attached, we are relying on the free-object path |
350 | * to detach.. which seems ok.. |
351 | */ |
352 | drm_gem_handle_delete(file_priv, *handle); |
353 | dma_buf_put(dma_buf); |
354 | return ret; |
355 | |
356 | out_unlock: |
357 | mutex_unlock(&dev->object_name_lock)rw_exit_write(&dev->object_name_lock); |
358 | out_put: |
359 | mutex_unlock(&file_priv->prime.lock)rw_exit_write(&file_priv->prime.lock); |
360 | dma_buf_put(dma_buf); |
361 | return ret; |
362 | } |
363 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); |
364 | |
365 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, |
366 | struct drm_file *file_priv) |
367 | { |
368 | struct drm_prime_handle *args = data; |
369 | |
370 | if (!dev->driver->prime_fd_to_handle) |
371 | return -ENOSYS78; |
372 | |
373 | return dev->driver->prime_fd_to_handle(dev, file_priv, |
374 | args->fd, &args->handle); |
375 | } |
376 | |
377 | static struct dma_buf *export_and_register_object(struct drm_device *dev, |
378 | struct drm_gem_object *obj, |
379 | uint32_t flags) |
380 | { |
381 | struct dma_buf *dmabuf; |
382 | |
383 | /* prevent races with concurrent gem_close. */ |
384 | if (obj->handle_count == 0) { |
385 | dmabuf = ERR_PTR(-ENOENT2); |
386 | return dmabuf; |
387 | } |
388 | |
389 | if (obj->funcs && obj->funcs->export) |
390 | dmabuf = obj->funcs->export(obj, flags); |
391 | else if (dev->driver->gem_prime_export) |
392 | dmabuf = dev->driver->gem_prime_export(obj, flags); |
393 | else |
394 | dmabuf = drm_gem_prime_export(obj, flags); |
395 | if (IS_ERR(dmabuf)) { |
396 | /* normally the created dma-buf takes ownership of the ref, |
397 | * but if that fails then drop the ref |
398 | */ |
399 | return dmabuf; |
400 | } |
401 | |
402 | /* |
403 | * Note that callers do not need to clean up the export cache |
404 | * since the check for obj->handle_count guarantees that someone |
405 | * will clean it up. |
406 | */ |
407 | obj->dma_buf = dmabuf; |
408 | get_dma_buf(obj->dma_buf); |
409 | |
410 | return dmabuf; |
411 | } |
412 | |
413 | /** |
414 | * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers |
415 | * @dev: dev to export the buffer from |
416 | * @file_priv: drm file-private structure |
417 | * @handle: buffer handle to export |
418 | * @flags: flags like DRM_CLOEXEC |
419 | * @prime_fd: pointer to storage for the fd id of the create dma-buf |
420 | * |
421 | * This is the PRIME export function which must be used mandatorily by GEM |
422 | * drivers to ensure correct lifetime management of the underlying GEM object. |
423 | * The actual exporting from GEM object to a dma-buf is done through the |
424 | * &drm_driver.gem_prime_export driver callback. |
425 | */ |
426 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
427 | struct drm_file *file_priv, uint32_t handle, |
428 | uint32_t flags, |
429 | int *prime_fd) |
430 | { |
431 | struct drm_gem_object *obj; |
432 | int ret = 0; |
433 | struct dma_buf *dmabuf; |
434 | |
435 | mutex_lock(&file_priv->prime.lock)rw_enter_write(&file_priv->prime.lock); |
436 | obj = drm_gem_object_lookup(file_priv, handle); |
437 | if (!obj) { |
438 | ret = -ENOENT2; |
439 | goto out_unlock; |
440 | } |
441 | |
442 | dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle); |
443 | if (dmabuf) { |
444 | get_dma_buf(dmabuf); |
445 | goto out_have_handle; |
446 | } |
447 | |
448 | mutex_lock(&dev->object_name_lock)rw_enter_write(&dev->object_name_lock); |
449 | #ifdef notyet |
450 | /* re-export the original imported object */ |
451 | if (obj->import_attach) { |
452 | dmabuf = obj->import_attach->dmabuf; |
453 | get_dma_buf(dmabuf); |
454 | goto out_have_obj; |
455 | } |
456 | #endif |
457 | |
458 | if (obj->dma_buf) { |
459 | get_dma_buf(obj->dma_buf); |
460 | dmabuf = obj->dma_buf; |
461 | goto out_have_obj; |
462 | } |
463 | |
464 | dmabuf = export_and_register_object(dev, obj, flags); |
465 | if (IS_ERR(dmabuf)) { |
466 | /* normally the created dma-buf takes ownership of the ref, |
467 | * but if that fails then drop the ref |
468 | */ |
469 | ret = PTR_ERR(dmabuf); |
470 | mutex_unlock(&dev->object_name_lock)rw_exit_write(&dev->object_name_lock); |
471 | goto out; |
472 | } |
473 | |
474 | out_have_obj: |
475 | /* |
476 | * If we've exported this buffer then cheat and add it to the import list |
477 | * so we get the correct handle back. We must do this under the |
478 | * protection of dev->object_name_lock to ensure that a racing gem close |
479 | * ioctl doesn't miss to remove this buffer handle from the cache. |
480 | */ |
481 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
482 | dmabuf, handle); |
483 | mutex_unlock(&dev->object_name_lock)rw_exit_write(&dev->object_name_lock); |
484 | if (ret) |
485 | goto fail_put_dmabuf; |
486 | |
487 | out_have_handle: |
488 | ret = dma_buf_fd(dmabuf, flags); |
489 | /* |
490 | * We must _not_ remove the buffer from the handle cache since the newly |
491 | * created dma buf is already linked in the global obj->dma_buf pointer, |
492 | * and that is invariant as long as a userspace gem handle exists. |
493 | * Closing the handle will clean out the cache anyway, so we don't leak. |
494 | */ |
495 | if (ret < 0) { |
496 | goto fail_put_dmabuf; |
497 | } else { |
498 | *prime_fd = ret; |
499 | ret = 0; |
500 | } |
501 | |
502 | goto out; |
503 | |
504 | fail_put_dmabuf: |
505 | dma_buf_put(dmabuf); |
506 | out: |
507 | drm_gem_object_put(obj); |
508 | out_unlock: |
509 | mutex_unlock(&file_priv->prime.lock)rw_exit_write(&file_priv->prime.lock); |
510 | |
511 | return ret; |
512 | } |
513 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); |
514 | |
515 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, |
516 | struct drm_file *file_priv) |
517 | { |
518 | struct drm_prime_handle *args = data; |
519 | |
520 | if (!dev->driver->prime_handle_to_fd) |
521 | return -ENOSYS78; |
522 | |
523 | /* check flags are valid */ |
524 | if (args->flags & ~(DRM_CLOEXEC0x10000 | DRM_RDWR0x0002)) |
525 | return -EINVAL22; |
526 | |
527 | return dev->driver->prime_handle_to_fd(dev, file_priv, |
528 | args->handle, args->flags, &args->fd); |
529 | } |
530 | |
531 | /** |
532 | * DOC: PRIME Helpers |
533 | * |
534 | * Drivers can implement &drm_gem_object_funcs.export and |
535 | * &drm_driver.gem_prime_import in terms of simpler APIs by using the helper |
536 | * functions drm_gem_prime_export() and drm_gem_prime_import(). These functions |
537 | * implement dma-buf support in terms of some lower-level helpers, which are |
538 | * again exported for drivers to use individually: |
539 | * |
540 | * Exporting buffers |
541 | * ~~~~~~~~~~~~~~~~~ |
542 | * |
543 | * Optional pinning of buffers is handled at dma-buf attach and detach time in |
544 | * drm_gem_map_attach() and drm_gem_map_detach(). Backing storage itself is |
545 | * handled by drm_gem_map_dma_buf() and drm_gem_unmap_dma_buf(), which relies on |
546 | * &drm_gem_object_funcs.get_sg_table. |
547 | * |
548 | * For kernel-internal access there's drm_gem_dmabuf_vmap() and |
549 | * drm_gem_dmabuf_vunmap(). Userspace mmap support is provided by |
550 | * drm_gem_dmabuf_mmap(). |
551 | * |
552 | * Note that these export helpers can only be used if the underlying backing |
553 | * storage is fully coherent and either permanently pinned, or it is safe to pin |
554 | * it indefinitely. |
555 | * |
556 | * FIXME: The underlying helper functions are named rather inconsistently. |
557 | * |
558 | * Exporting buffers |
559 | * ~~~~~~~~~~~~~~~~~ |
560 | * |
561 | * Importing dma-bufs using drm_gem_prime_import() relies on |
562 | * &drm_driver.gem_prime_import_sg_table. |
563 | * |
564 | * Note that similarly to the export helpers this permanently pins the |
565 | * underlying backing storage. Which is ok for scanout, but is not the best |
566 | * option for sharing lots of buffers for rendering. |
567 | */ |
568 | |
569 | /** |
570 | * drm_gem_map_attach - dma_buf attach implementation for GEM |
571 | * @dma_buf: buffer to attach device to |
572 | * @attach: buffer attachment data |
573 | * |
574 | * Calls &drm_gem_object_funcs.pin for device specific handling. This can be |
575 | * used as the &dma_buf_ops.attach callback. Must be used together with |
576 | * drm_gem_map_detach(). |
577 | * |
578 | * Returns 0 on success, negative error code on failure. |
579 | */ |
580 | int drm_gem_map_attach(struct dma_buf *dma_buf, |
581 | struct dma_buf_attachment *attach) |
582 | { |
583 | struct drm_gem_object *obj = dma_buf->priv; |
584 | |
585 | return drm_gem_pin(obj); |
586 | } |
587 | EXPORT_SYMBOL(drm_gem_map_attach); |
588 | |
589 | /** |
590 | * drm_gem_map_detach - dma_buf detach implementation for GEM |
591 | * @dma_buf: buffer to detach from |
592 | * @attach: attachment to be detached |
593 | * |
594 | * Calls &drm_gem_object_funcs.pin for device specific handling. Cleans up |
595 | * &dma_buf_attachment from drm_gem_map_attach(). This can be used as the |
596 | * &dma_buf_ops.detach callback. |
597 | */ |
598 | void drm_gem_map_detach(struct dma_buf *dma_buf, |
599 | struct dma_buf_attachment *attach) |
600 | { |
601 | struct drm_gem_object *obj = dma_buf->priv; |
602 | |
603 | drm_gem_unpin(obj); |
604 | } |
605 | EXPORT_SYMBOL(drm_gem_map_detach); |
606 | |
607 | #ifdef notyet |
608 | |
609 | /** |
610 | * drm_gem_map_dma_buf - map_dma_buf implementation for GEM |
611 | * @attach: attachment whose scatterlist is to be returned |
612 | * @dir: direction of DMA transfer |
613 | * |
614 | * Calls &drm_gem_object_funcs.get_sg_table and then maps the scatterlist. This |
615 | * can be used as the &dma_buf_ops.map_dma_buf callback. Should be used together |
616 | * with drm_gem_unmap_dma_buf(). |
617 | * |
618 | * Returns:sg_table containing the scatterlist to be returned; returns ERR_PTR |
619 | * on error. May return -EINTR if it is interrupted by a signal. |
620 | */ |
621 | struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
622 | enum dma_data_direction dir) |
623 | { |
624 | struct drm_gem_object *obj = attach->dmabuf->priv; |
625 | struct sg_table *sgt; |
626 | int ret; |
627 | |
628 | if (WARN_ON(dir == DMA_NONE)({ int __ret = !!(dir == DMA_NONE); if (__ret) printf("WARNING %s failed at %s:%d\n" , "dir == DMA_NONE", "/usr/src/sys/dev/pci/drm/drm_prime.c", 628 ); __builtin_expect(!!(__ret), 0); })) |
629 | return ERR_PTR(-EINVAL22); |
630 | |
631 | if (obj->funcs) |
632 | sgt = obj->funcs->get_sg_table(obj); |
633 | else |
634 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); |
635 | |
636 | ret = dma_map_sgtable(attach->dev, sgt, dir, |
637 | DMA_ATTR_SKIP_CPU_SYNC); |
638 | if (ret) { |
639 | sg_free_table(sgt); |
640 | kfree(sgt); |
641 | sgt = ERR_PTR(ret); |
642 | } |
643 | |
644 | return sgt; |
645 | } |
646 | EXPORT_SYMBOL(drm_gem_map_dma_buf); |
647 | |
648 | /** |
649 | * drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM |
650 | * @attach: attachment to unmap buffer from |
651 | * @sgt: scatterlist info of the buffer to unmap |
652 | * @dir: direction of DMA transfer |
653 | * |
654 | * This can be used as the &dma_buf_ops.unmap_dma_buf callback. |
655 | */ |
656 | void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, |
657 | struct sg_table *sgt, |
658 | enum dma_data_direction dir) |
659 | { |
660 | if (!sgt) |
661 | return; |
662 | |
663 | dma_unmap_sgtable(attach->dev, sgt, dir, DMA_ATTR_SKIP_CPU_SYNC); |
664 | sg_free_table(sgt); |
665 | kfree(sgt); |
666 | } |
667 | EXPORT_SYMBOL(drm_gem_unmap_dma_buf); |
668 | |
669 | #endif /* notyet */ |
670 | |
671 | /** |
672 | * drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM |
673 | * @dma_buf: buffer to be mapped |
674 | * |
675 | * Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap |
676 | * callback. Calls into &drm_gem_object_funcs.vmap for device specific handling. |
677 | * |
678 | * Returns the kernel virtual address or NULL on failure. |
679 | */ |
680 | void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
681 | { |
682 | struct drm_gem_object *obj = dma_buf->priv; |
683 | void *vaddr; |
684 | |
685 | vaddr = drm_gem_vmap(obj); |
686 | if (IS_ERR(vaddr)) |
687 | vaddr = NULL((void *)0); |
688 | |
689 | return vaddr; |
690 | } |
691 | EXPORT_SYMBOL(drm_gem_dmabuf_vmap); |
692 | |
693 | /** |
694 | * drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM |
695 | * @dma_buf: buffer to be unmapped |
696 | * @vaddr: the virtual address of the buffer |
697 | * |
698 | * Releases a kernel virtual mapping. This can be used as the |
699 | * &dma_buf_ops.vunmap callback. Calls into &drm_gem_object_funcs.vunmap for device specific handling. |
700 | */ |
701 | void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) |
702 | { |
703 | struct drm_gem_object *obj = dma_buf->priv; |
704 | |
705 | drm_gem_vunmap(obj, vaddr); |
706 | } |
707 | EXPORT_SYMBOL(drm_gem_dmabuf_vunmap); |
708 | |
709 | #ifdef notyet |
710 | |
711 | /** |
712 | * drm_gem_prime_mmap - PRIME mmap function for GEM drivers |
713 | * @obj: GEM object |
714 | * @vma: Virtual address range |
715 | * |
716 | * This function sets up a userspace mapping for PRIME exported buffers using |
717 | * the same codepath that is used for regular GEM buffer mapping on the DRM fd. |
718 | * The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is |
719 | * called to set up the mapping. |
720 | * |
721 | * Drivers can use this as their &drm_driver.gem_prime_mmap callback. |
722 | */ |
723 | int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) |
724 | { |
725 | struct drm_file *priv; |
726 | struct file *fil; |
727 | int ret; |
728 | |
729 | /* Add the fake offset */ |
730 | vma->vm_pgoff += drm_vma_node_start(&obj->vma_node); |
731 | |
732 | if (obj->funcs && obj->funcs->mmap) { |
733 | ret = obj->funcs->mmap(obj, vma); |
734 | if (ret) |
735 | return ret; |
736 | vma->vm_private_data = obj; |
737 | drm_gem_object_get(obj); |
738 | return 0; |
739 | } |
740 | |
741 | priv = kzalloc(sizeof(*priv), GFP_KERNEL(0x0001 | 0x0004)); |
742 | fil = kzalloc(sizeof(*fil), GFP_KERNEL(0x0001 | 0x0004)); |
743 | if (!priv || !fil) { |
744 | ret = -ENOMEM12; |
745 | goto out; |
746 | } |
747 | |
748 | /* Used by drm_gem_mmap() to lookup the GEM object */ |
749 | priv->minor = obj->dev->primary; |
750 | fil->private_data = priv; |
751 | |
752 | ret = drm_vma_node_allow(&obj->vma_node, priv); |
753 | if (ret) |
754 | goto out; |
755 | |
756 | ret = obj->dev->driver->fops->mmap(fil, vma); |
757 | |
758 | drm_vma_node_revoke(&obj->vma_node, priv); |
759 | out: |
760 | kfree(priv); |
761 | kfree(fil); |
762 | |
763 | return ret; |
764 | } |
765 | EXPORT_SYMBOL(drm_gem_prime_mmap); |
766 | |
767 | /** |
768 | * drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM |
769 | * @dma_buf: buffer to be mapped |
770 | * @vma: virtual address range |
771 | * |
772 | * Provides memory mapping for the buffer. This can be used as the |
773 | * &dma_buf_ops.mmap callback. It just forwards to &drm_driver.gem_prime_mmap, |
774 | * which should be set to drm_gem_prime_mmap(). |
775 | * |
776 | * FIXME: There's really no point to this wrapper, drivers which need anything |
777 | * else but drm_gem_prime_mmap can roll their own &dma_buf_ops.mmap callback. |
778 | * |
779 | * Returns 0 on success or a negative error code on failure. |
780 | */ |
781 | int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) |
782 | { |
783 | struct drm_gem_object *obj = dma_buf->priv; |
784 | struct drm_device *dev = obj->dev; |
785 | |
786 | if (!dev->driver->gem_prime_mmap) |
787 | return -ENOSYS78; |
788 | |
789 | return dev->driver->gem_prime_mmap(obj, vma); |
790 | } |
791 | EXPORT_SYMBOL(drm_gem_dmabuf_mmap); |
792 | |
793 | #endif /* notyet */ |
794 | |
795 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { |
796 | #ifdef notyet |
797 | .cache_sgt_mapping = true1, |
798 | .attach = drm_gem_map_attach, |
799 | .detach = drm_gem_map_detach, |
800 | .map_dma_buf = drm_gem_map_dma_buf, |
801 | .unmap_dma_buf = drm_gem_unmap_dma_buf, |
802 | #endif |
803 | .release = drm_gem_dmabuf_release, |
804 | #ifdef notyet |
805 | .mmap = drm_gem_dmabuf_mmap, |
806 | .vmap = drm_gem_dmabuf_vmap, |
807 | .vunmap = drm_gem_dmabuf_vunmap, |
808 | #endif |
809 | }; |
810 | |
811 | /** |
812 | * drm_prime_pages_to_sg - converts a page array into an sg list |
813 | * @dev: DRM device |
814 | * @pages: pointer to the array of page pointers to convert |
815 | * @nr_pages: length of the page vector |
816 | * |
817 | * This helper creates an sg table object from a set of pages |
818 | * the driver is responsible for mapping the pages into the |
819 | * importers address space for use with dma_buf itself. |
820 | * |
821 | * This is useful for implementing &drm_gem_object_funcs.get_sg_table. |
822 | */ |
823 | struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev, |
824 | struct vm_page **pages, unsigned int nr_pages) |
825 | { |
826 | STUB()do { printf("%s: stub\n", __func__); } while(0); |
827 | return NULL((void *)0); |
828 | #ifdef notyet |
829 | struct sg_table *sg; |
830 | struct scatterlist *sge; |
831 | size_t max_segment = 0; |
832 | |
833 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL(0x0001 | 0x0004)); |
834 | if (!sg) |
835 | return ERR_PTR(-ENOMEM12); |
836 | |
837 | if (dev) |
838 | max_segment = dma_max_mapping_size(dev->dev); |
839 | if (max_segment == 0 || max_segment > SCATTERLIST_MAX_SEGMENT) |
840 | max_segment = SCATTERLIST_MAX_SEGMENT; |
841 | sge = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
842 | nr_pages << PAGE_SHIFT12, |
843 | max_segment, |
844 | NULL((void *)0), 0, GFP_KERNEL(0x0001 | 0x0004)); |
845 | if (IS_ERR(sge)) { |
846 | kfree(sg); |
847 | sg = ERR_CAST(sge); |
848 | } |
849 | return sg; |
850 | #endif |
851 | } |
852 | EXPORT_SYMBOL(drm_prime_pages_to_sg); |
853 | |
854 | /** |
855 | * drm_prime_get_contiguous_size - returns the contiguous size of the buffer |
856 | * @sgt: sg_table describing the buffer to check |
857 | * |
858 | * This helper calculates the contiguous size in the DMA address space |
859 | * of the the buffer described by the provided sg_table. |
860 | * |
861 | * This is useful for implementing |
862 | * &drm_gem_object_funcs.gem_prime_import_sg_table. |
863 | */ |
864 | unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt) |
865 | { |
866 | STUB()do { printf("%s: stub\n", __func__); } while(0); |
867 | return 0; |
868 | #ifdef notyet |
869 | dma_addr_t expected = sg_dma_address(sgt->sgl)((sgt->sgl)->dma_address); |
870 | struct scatterlist *sg; |
871 | unsigned long size = 0; |
872 | int i; |
873 | |
874 | for_each_sgtable_dma_sg(sgt, sg, i) { |
875 | unsigned int len = sg_dma_len(sg)((sg)->length); |
876 | |
877 | if (!len) |
878 | break; |
879 | if (sg_dma_address(sg)((sg)->dma_address) != expected) |
880 | break; |
881 | expected += len; |
882 | size += len; |
883 | } |
884 | return size; |
885 | #endif |
886 | } |
887 | EXPORT_SYMBOL(drm_prime_get_contiguous_size); |
888 | |
889 | /** |
890 | * drm_gem_prime_export - helper library implementation of the export callback |
891 | * @obj: GEM object to export |
892 | * @flags: flags like DRM_CLOEXEC and DRM_RDWR |
893 | * |
894 | * This is the implementation of the &drm_gem_object_funcs.export functions for GEM drivers |
895 | * using the PRIME helpers. It is used as the default in |
896 | * drm_gem_prime_handle_to_fd(). |
897 | */ |
898 | struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj, |
899 | int flags) |
900 | { |
901 | struct drm_device *dev = obj->dev; |
902 | struct dma_buf_export_info exp_info = { |
903 | #ifdef __linux__ |
904 | .exp_name = KBUILD_MODNAME, /* white lie for debug */ |
905 | .owner = dev->driver->fops->owner, |
906 | #endif |
907 | .ops = &drm_gem_prime_dmabuf_ops, |
908 | .size = obj->size, |
909 | .flags = flags, |
910 | .priv = obj, |
911 | .resv = obj->resv, |
912 | }; |
913 | |
914 | return drm_gem_dmabuf_export(dev, &exp_info); |
915 | } |
916 | EXPORT_SYMBOL(drm_gem_prime_export); |
917 | |
918 | /** |
919 | * drm_gem_prime_import_dev - core implementation of the import callback |
920 | * @dev: drm_device to import into |
921 | * @dma_buf: dma-buf object to import |
922 | * @attach_dev: struct device to dma_buf attach |
923 | * |
924 | * This is the core of drm_gem_prime_import(). It's designed to be called by |
925 | * drivers who want to use a different device structure than &drm_device.dev for |
926 | * attaching via dma_buf. This function calls |
927 | * &drm_driver.gem_prime_import_sg_table internally. |
928 | * |
929 | * Drivers must arrange to call drm_prime_gem_destroy() from their |
930 | * &drm_gem_object_funcs.free hook when using this function. |
931 | */ |
932 | struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev, |
933 | struct dma_buf *dma_buf, |
934 | struct device *attach_dev) |
935 | { |
936 | struct dma_buf_attachment *attach; |
937 | #ifdef notyet |
938 | struct sg_table *sgt; |
939 | #endif |
940 | struct drm_gem_object *obj; |
941 | int ret; |
942 | |
943 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { |
944 | obj = dma_buf->priv; |
945 | if (obj->dev == dev) { |
946 | /* |
947 | * Importing dmabuf exported from out own gem increases |
948 | * refcount on gem itself instead of f_count of dmabuf. |
949 | */ |
950 | drm_gem_object_get(obj); |
951 | return obj; |
952 | } |
953 | } |
954 | |
955 | #ifdef notyet |
956 | if (!dev->driver->gem_prime_import_sg_table) |
957 | return ERR_PTR(-EINVAL22); |
958 | #endif |
959 | |
960 | attach = dma_buf_attach(dma_buf, attach_dev)((void *)0); |
961 | if (IS_ERR(attach)) |
962 | return ERR_CAST(attach); |
963 | |
964 | #ifdef notyet |
965 | get_dma_buf(dma_buf); |
966 | |
967 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
968 | if (IS_ERR(sgt)) { |
969 | ret = PTR_ERR(sgt); |
970 | goto fail_detach; |
971 | } |
972 | |
973 | obj = dev->driver->gem_prime_import_sg_table(dev, attach, sgt); |
974 | if (IS_ERR(obj)) { |
975 | ret = PTR_ERR(obj); |
976 | goto fail_unmap; |
977 | } |
978 | |
979 | obj->import_attach = attach; |
980 | obj->resv = dma_buf->resv; |
981 | |
982 | return obj; |
983 | |
984 | fail_unmap: |
985 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); |
986 | fail_detach: |
987 | dma_buf_detach(dma_buf, attach)panic("dma_buf_detach"); |
988 | dma_buf_put(dma_buf); |
989 | |
990 | return ERR_PTR(ret); |
991 | #else |
992 | ret = 0; |
Value stored to 'ret' is never read | |
993 | panic(__func__); |
994 | #endif |
995 | } |
996 | EXPORT_SYMBOL(drm_gem_prime_import_dev); |
997 | |
998 | /** |
999 | * drm_gem_prime_import - helper library implementation of the import callback |
1000 | * @dev: drm_device to import into |
1001 | * @dma_buf: dma-buf object to import |
1002 | * |
1003 | * This is the implementation of the gem_prime_import functions for GEM drivers |
1004 | * using the PRIME helpers. Drivers can use this as their |
1005 | * &drm_driver.gem_prime_import implementation. It is used as the default |
1006 | * implementation in drm_gem_prime_fd_to_handle(). |
1007 | * |
1008 | * Drivers must arrange to call drm_prime_gem_destroy() from their |
1009 | * &drm_gem_object_funcs.free hook when using this function. |
1010 | */ |
1011 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
1012 | struct dma_buf *dma_buf) |
1013 | { |
1014 | return drm_gem_prime_import_dev(dev, dma_buf, dev->dev); |
1015 | } |
1016 | EXPORT_SYMBOL(drm_gem_prime_import); |
1017 | |
1018 | /** |
1019 | * drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array |
1020 | * @sgt: scatter-gather table to convert |
1021 | * @pages: optional array of page pointers to store the page array in |
1022 | * @addrs: optional array to store the dma bus address of each page |
1023 | * @max_entries: size of both the passed-in arrays |
1024 | * |
1025 | * Exports an sg table into an array of pages and addresses. This is currently |
1026 | * required by the TTM driver in order to do correct fault handling. |
1027 | * |
1028 | * Drivers can use this in their &drm_driver.gem_prime_import_sg_table |
1029 | * implementation. |
1030 | */ |
1031 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct vm_page **pages, |
1032 | dma_addr_t *addrs, int max_entries) |
1033 | { |
1034 | STUB()do { printf("%s: stub\n", __func__); } while(0); |
1035 | return -ENOSYS78; |
1036 | #ifdef notyet |
1037 | struct sg_dma_page_iter dma_iter; |
1038 | struct sg_page_iter page_iter; |
1039 | struct vm_page **p = pages; |
1040 | dma_addr_t *a = addrs; |
1041 | |
1042 | if (pages) { |
1043 | for_each_sgtable_page(sgt, &page_iter, 0)__sg_page_iter_start((&page_iter), ((sgt)->sgl), ((sgt )->orig_nents), (0)); while (__sg_page_iter_next(&page_iter )) { |
1044 | if (WARN_ON(p - pages >= max_entries)({ int __ret = !!(p - pages >= max_entries); if (__ret) printf ("WARNING %s failed at %s:%d\n", "p - pages >= max_entries" , "/usr/src/sys/dev/pci/drm/drm_prime.c", 1044); __builtin_expect (!!(__ret), 0); })) |
1045 | return -1; |
1046 | *p++ = sg_page_iter_page(&page_iter); |
1047 | } |
1048 | } |
1049 | if (addrs) { |
1050 | for_each_sgtable_dma_page(sgt, &dma_iter, 0) { |
1051 | if (WARN_ON(a - addrs >= max_entries)({ int __ret = !!(a - addrs >= max_entries); if (__ret) printf ("WARNING %s failed at %s:%d\n", "a - addrs >= max_entries" , "/usr/src/sys/dev/pci/drm/drm_prime.c", 1051); __builtin_expect (!!(__ret), 0); })) |
1052 | return -1; |
1053 | *a++ = sg_page_iter_dma_address(&dma_iter); |
1054 | } |
1055 | } |
1056 | |
1057 | return 0; |
1058 | #endif |
1059 | } |
1060 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); |
1061 | |
1062 | /** |
1063 | * drm_prime_gem_destroy - helper to clean up a PRIME-imported GEM object |
1064 | * @obj: GEM object which was created from a dma-buf |
1065 | * @sg: the sg-table which was pinned at import time |
1066 | * |
1067 | * This is the cleanup functions which GEM drivers need to call when they use |
1068 | * drm_gem_prime_import() or drm_gem_prime_import_dev() to import dma-bufs. |
1069 | */ |
1070 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) |
1071 | { |
1072 | STUB()do { printf("%s: stub\n", __func__); } while(0); |
1073 | #ifdef notyet |
1074 | struct dma_buf_attachment *attach; |
1075 | struct dma_buf *dma_buf; |
1076 | |
1077 | attach = obj->import_attach; |
1078 | if (sg) |
1079 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
1080 | dma_buf = attach->dmabuf; |
1081 | dma_buf_detach(attach->dmabuf, attach)panic("dma_buf_detach"); |
1082 | /* remove the reference */ |
1083 | dma_buf_put(dma_buf); |
1084 | #endif |
1085 | } |
1086 | EXPORT_SYMBOL(drm_prime_gem_destroy); |