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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> | |
077675c1 | 31 | #include <linux/rbtree.h> |
0500c04e | 32 | |
39716270 | 33 | #include <drm/drm.h> |
0500c04e SR |
34 | #include <drm/drm_drv.h> |
35 | #include <drm/drm_file.h> | |
36 | #include <drm/drm_framebuffer.h> | |
d9fc9413 | 37 | #include <drm/drm_gem.h> |
0500c04e | 38 | #include <drm/drm_prime.h> |
d9fc9413 | 39 | |
67d0ec4e | 40 | #include "drm_internal.h" |
3248877e | 41 | |
805dc614 DV |
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 | * | |
ee8375d5 | 51 | * Drivers that support the PRIME API implement the |
805dc614 DV |
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. | |
3248877e DA |
88 | */ |
89 | ||
90 | struct drm_prime_member { | |
3248877e DA |
91 | struct dma_buf *dma_buf; |
92 | uint32_t handle; | |
077675c1 CW |
93 | |
94 | struct rb_node dmabuf_rb; | |
95 | struct rb_node handle_rb; | |
3248877e | 96 | }; |
538d6661 | 97 | |
39cc344a DV |
98 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, |
99 | struct dma_buf *dma_buf, uint32_t handle) | |
ce92e3c9 SWK |
100 | { |
101 | struct drm_prime_member *member; | |
077675c1 | 102 | struct rb_node **p, *rb; |
ce92e3c9 SWK |
103 | |
104 | member = kmalloc(sizeof(*member), GFP_KERNEL); | |
105 | if (!member) | |
106 | return -ENOMEM; | |
107 | ||
108 | get_dma_buf(dma_buf); | |
109 | member->dma_buf = dma_buf; | |
110 | member->handle = handle; | |
077675c1 CW |
111 | |
112 | rb = NULL; | |
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); | |
119 | if (dma_buf > pos->dma_buf) | |
120 | p = &rb->rb_right; | |
121 | else | |
122 | p = &rb->rb_left; | |
123 | } | |
124 | rb_link_node(&member->dmabuf_rb, rb, p); | |
125 | rb_insert_color(&member->dmabuf_rb, &prime_fpriv->dmabufs); | |
126 | ||
127 | rb = NULL; | |
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); | |
134 | if (handle > pos->handle) | |
135 | p = &rb->rb_right; | |
136 | else | |
137 | p = &rb->rb_left; | |
138 | } | |
139 | rb_link_node(&member->handle_rb, rb, p); | |
140 | rb_insert_color(&member->handle_rb, &prime_fpriv->handles); | |
141 | ||
ce92e3c9 SWK |
142 | return 0; |
143 | } | |
3248877e | 144 | |
d0b2c533 DV |
145 | static struct dma_buf *drm_prime_lookup_buf_by_handle(struct drm_prime_file_private *prime_fpriv, |
146 | uint32_t handle) | |
147 | { | |
077675c1 CW |
148 | struct rb_node *rb; |
149 | ||
150 | rb = prime_fpriv->handles.rb_node; | |
151 | while (rb) { | |
152 | struct drm_prime_member *member; | |
d0b2c533 | 153 | |
077675c1 | 154 | member = rb_entry(rb, struct drm_prime_member, handle_rb); |
d0b2c533 DV |
155 | if (member->handle == handle) |
156 | return member->dma_buf; | |
077675c1 CW |
157 | else if (member->handle < handle) |
158 | rb = rb->rb_right; | |
159 | else | |
160 | rb = rb->rb_left; | |
d0b2c533 DV |
161 | } |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
de9564d8 DV |
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 | { | |
077675c1 CW |
170 | struct rb_node *rb; |
171 | ||
172 | rb = prime_fpriv->dmabufs.rb_node; | |
173 | while (rb) { | |
174 | struct drm_prime_member *member; | |
de9564d8 | 175 | |
077675c1 | 176 | member = rb_entry(rb, struct drm_prime_member, dmabuf_rb); |
de9564d8 DV |
177 | if (member->dma_buf == dma_buf) { |
178 | *handle = member->handle; | |
179 | return 0; | |
077675c1 CW |
180 | } else if (member->dma_buf < dma_buf) { |
181 | rb = rb->rb_right; | |
182 | } else { | |
183 | rb = rb->rb_left; | |
de9564d8 DV |
184 | } |
185 | } | |
077675c1 | 186 | |
de9564d8 DV |
187 | return -ENOENT; |
188 | } | |
189 | ||
d0b2c533 DV |
190 | void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, |
191 | struct dma_buf *dma_buf) | |
da34242e | 192 | { |
077675c1 | 193 | struct rb_node *rb; |
da34242e | 194 | |
077675c1 CW |
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); | |
da34242e | 200 | if (member->dma_buf == dma_buf) { |
077675c1 CW |
201 | rb_erase(&member->handle_rb, &prime_fpriv->handles); |
202 | rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs); | |
203 | ||
da34242e | 204 | dma_buf_put(dma_buf); |
da34242e | 205 | kfree(member); |
077675c1 CW |
206 | return; |
207 | } else if (member->dma_buf < dma_buf) { | |
208 | rb = rb->rb_right; | |
209 | } else { | |
210 | rb = rb->rb_left; | |
da34242e YC |
211 | } |
212 | } | |
213 | } | |
214 | ||
b283e92a | 215 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) |
89177644 | 216 | { |
b283e92a DV |
217 | mutex_init(&prime_fpriv->lock); |
218 | prime_fpriv->dmabufs = RB_ROOT; | |
219 | prime_fpriv->handles = RB_ROOT; | |
89177644 AP |
220 | } |
221 | ||
b283e92a | 222 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) |
89177644 | 223 | { |
b283e92a DV |
224 | /* by now drm_gem_release should've made sure the list is empty */ |
225 | WARN_ON(!RB_EMPTY_ROOT(&prime_fpriv->dmabufs)); | |
89177644 AP |
226 | } |
227 | ||
a4fce9cb | 228 | /** |
805dc614 | 229 | * drm_gem_dmabuf_export - &dma_buf export implementation for GEM |
67c8f116 CW |
230 | * @dev: parent device for the exported dmabuf |
231 | * @exp_info: the export information used by dma_buf_export() | |
a4fce9cb CW |
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 | |
72a93e8d | 235 | * a reference to the &drm_device and the exported &drm_gem_object (stored in |
940eba2d | 236 | * &dma_buf_export_info.priv) which is released by drm_gem_dmabuf_release(). |
a4fce9cb CW |
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 | { | |
b3fac52c | 243 | struct drm_gem_object *obj = exp_info->priv; |
a4fce9cb CW |
244 | struct dma_buf *dma_buf; |
245 | ||
246 | dma_buf = dma_buf_export(exp_info); | |
72a93e8d CW |
247 | if (IS_ERR(dma_buf)) |
248 | return dma_buf; | |
249 | ||
9a96f550 | 250 | drm_dev_get(dev); |
b3fac52c GH |
251 | drm_gem_object_get(obj); |
252 | dma_buf->file->f_mapping = obj->dev->anon_inode->i_mapping; | |
a4fce9cb CW |
253 | |
254 | return dma_buf; | |
255 | } | |
256 | EXPORT_SYMBOL(drm_gem_dmabuf_export); | |
257 | ||
39cc344a | 258 | /** |
805dc614 | 259 | * drm_gem_dmabuf_release - &dma_buf release implementation for GEM |
39cc344a DV |
260 | * @dma_buf: buffer to be released |
261 | * | |
262 | * Generic release function for dma_bufs exported as PRIME buffers. GEM drivers | |
805dc614 | 263 | * must use this in their &dma_buf_ops structure as the release callback. |
a4fce9cb CW |
264 | * drm_gem_dmabuf_release() should be used in conjunction with |
265 | * drm_gem_dmabuf_export(). | |
39cc344a | 266 | */ |
c1d6798d | 267 | void drm_gem_dmabuf_release(struct dma_buf *dma_buf) |
89177644 AP |
268 | { |
269 | struct drm_gem_object *obj = dma_buf->priv; | |
a4fce9cb | 270 | struct drm_device *dev = obj->dev; |
89177644 | 271 | |
319c933c | 272 | /* drop the reference on the export fd holds */ |
be6ee102 | 273 | drm_gem_object_put(obj); |
a4fce9cb | 274 | |
ffeeeed0 | 275 | drm_dev_put(dev); |
89177644 | 276 | } |
c1d6798d | 277 | EXPORT_SYMBOL(drm_gem_dmabuf_release); |
89177644 | 278 | |
f7a71b0c | 279 | /** |
b283e92a DV |
280 | * drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers |
281 | * @dev: dev to export the buffer from | |
282 | * @file_priv: drm file-private structure | |
283 | * @prime_fd: fd id of the dma-buf which should be imported | |
284 | * @handle: pointer to storage for the handle of the imported buffer object | |
f7a71b0c | 285 | * |
b283e92a DV |
286 | * This is the PRIME import function which must be used mandatorily by GEM |
287 | * drivers to ensure correct lifetime management of the underlying GEM object. | |
288 | * The actual importing of GEM object from the dma-buf is done through the | |
805dc614 DV |
289 | * &drm_driver.gem_prime_import driver callback. |
290 | * | |
291 | * Returns 0 on success or a negative error code on failure. | |
f7a71b0c | 292 | */ |
b283e92a DV |
293 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
294 | struct drm_file *file_priv, int prime_fd, | |
295 | uint32_t *handle) | |
89177644 | 296 | { |
b283e92a DV |
297 | struct dma_buf *dma_buf; |
298 | struct drm_gem_object *obj; | |
299 | int ret; | |
89177644 | 300 | |
b283e92a DV |
301 | dma_buf = dma_buf_get(prime_fd); |
302 | if (IS_ERR(dma_buf)) | |
303 | return PTR_ERR(dma_buf); | |
b39b5394 | 304 | |
b283e92a | 305 | mutex_lock(&file_priv->prime.lock); |
89177644 | 306 | |
b283e92a DV |
307 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
308 | dma_buf, handle); | |
309 | if (ret == 0) | |
310 | goto out_put; | |
89177644 | 311 | |
b283e92a DV |
312 | /* never seen this one, need to import */ |
313 | mutex_lock(&dev->object_name_lock); | |
314 | if (dev->driver->gem_prime_import) | |
315 | obj = dev->driver->gem_prime_import(dev, dma_buf); | |
316 | else | |
317 | obj = drm_gem_prime_import(dev, dma_buf); | |
318 | if (IS_ERR(obj)) { | |
319 | ret = PTR_ERR(obj); | |
320 | goto out_unlock; | |
321 | } | |
89177644 | 322 | |
b283e92a DV |
323 | if (obj->dma_buf) { |
324 | WARN_ON(obj->dma_buf != dma_buf); | |
325 | } else { | |
326 | obj->dma_buf = dma_buf; | |
327 | get_dma_buf(dma_buf); | |
328 | } | |
7c397cd9 | 329 | |
b283e92a DV |
330 | /* _handle_create_tail unconditionally unlocks dev->object_name_lock. */ |
331 | ret = drm_gem_handle_create_tail(file_priv, obj, handle); | |
be6ee102 | 332 | drm_gem_object_put(obj); |
b283e92a DV |
333 | if (ret) |
334 | goto out_put; | |
7c397cd9 | 335 | |
b283e92a DV |
336 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
337 | dma_buf, *handle); | |
338 | mutex_unlock(&file_priv->prime.lock); | |
339 | if (ret) | |
340 | goto fail; | |
89177644 | 341 | |
b283e92a | 342 | dma_buf_put(dma_buf); |
89177644 | 343 | |
b283e92a | 344 | return 0; |
89177644 | 345 | |
b283e92a DV |
346 | fail: |
347 | /* hmm, if driver attached, we are relying on the free-object path | |
348 | * to detach.. which seems ok.. | |
349 | */ | |
350 | drm_gem_handle_delete(file_priv, *handle); | |
351 | dma_buf_put(dma_buf); | |
352 | return ret; | |
353 | ||
354 | out_unlock: | |
355 | mutex_unlock(&dev->object_name_lock); | |
356 | out_put: | |
357 | mutex_unlock(&file_priv->prime.lock); | |
358 | dma_buf_put(dma_buf); | |
359 | return ret; | |
360 | } | |
361 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); | |
362 | ||
363 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, | |
364 | struct drm_file *file_priv) | |
89177644 | 365 | { |
b283e92a | 366 | struct drm_prime_handle *args = data; |
3aac4502 | 367 | |
b283e92a DV |
368 | if (!dev->driver->prime_fd_to_handle) |
369 | return -ENOSYS; | |
370 | ||
371 | return dev->driver->prime_fd_to_handle(dev, file_priv, | |
372 | args->fd, &args->handle); | |
89177644 | 373 | } |
89177644 | 374 | |
319c933c DV |
375 | static struct dma_buf *export_and_register_object(struct drm_device *dev, |
376 | struct drm_gem_object *obj, | |
377 | uint32_t flags) | |
378 | { | |
379 | struct dma_buf *dmabuf; | |
380 | ||
381 | /* prevent races with concurrent gem_close. */ | |
382 | if (obj->handle_count == 0) { | |
383 | dmabuf = ERR_PTR(-ENOENT); | |
384 | return dmabuf; | |
385 | } | |
386 | ||
b39b5394 NT |
387 | if (obj->funcs && obj->funcs->export) |
388 | dmabuf = obj->funcs->export(obj, flags); | |
f0014881 | 389 | else |
e4fa8457 | 390 | dmabuf = drm_gem_prime_export(obj, flags); |
319c933c DV |
391 | if (IS_ERR(dmabuf)) { |
392 | /* normally the created dma-buf takes ownership of the ref, | |
393 | * but if that fails then drop the ref | |
394 | */ | |
395 | return dmabuf; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Note that callers do not need to clean up the export cache | |
400 | * since the check for obj->handle_count guarantees that someone | |
401 | * will clean it up. | |
402 | */ | |
403 | obj->dma_buf = dmabuf; | |
404 | get_dma_buf(obj->dma_buf); | |
405 | ||
406 | return dmabuf; | |
407 | } | |
408 | ||
39cc344a DV |
409 | /** |
410 | * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers | |
411 | * @dev: dev to export the buffer from | |
412 | * @file_priv: drm file-private structure | |
413 | * @handle: buffer handle to export | |
414 | * @flags: flags like DRM_CLOEXEC | |
415 | * @prime_fd: pointer to storage for the fd id of the create dma-buf | |
416 | * | |
417 | * This is the PRIME export function which must be used mandatorily by GEM | |
418 | * drivers to ensure correct lifetime management of the underlying GEM object. | |
419 | * The actual exporting from GEM object to a dma-buf is done through the | |
d693def4 | 420 | * &drm_gem_object_funcs.export callback. |
39cc344a | 421 | */ |
3248877e | 422 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
39cc344a DV |
423 | struct drm_file *file_priv, uint32_t handle, |
424 | uint32_t flags, | |
425 | int *prime_fd) | |
3248877e DA |
426 | { |
427 | struct drm_gem_object *obj; | |
219b4733 DA |
428 | int ret = 0; |
429 | struct dma_buf *dmabuf; | |
3248877e | 430 | |
d0b2c533 | 431 | mutex_lock(&file_priv->prime.lock); |
a8ad0bd8 | 432 | obj = drm_gem_object_lookup(file_priv, handle); |
d0b2c533 DV |
433 | if (!obj) { |
434 | ret = -ENOENT; | |
435 | goto out_unlock; | |
436 | } | |
437 | ||
438 | dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle); | |
439 | if (dmabuf) { | |
440 | get_dma_buf(dmabuf); | |
441 | goto out_have_handle; | |
442 | } | |
3248877e | 443 | |
d0b2c533 | 444 | mutex_lock(&dev->object_name_lock); |
3248877e DA |
445 | /* re-export the original imported object */ |
446 | if (obj->import_attach) { | |
219b4733 | 447 | dmabuf = obj->import_attach->dmabuf; |
319c933c | 448 | get_dma_buf(dmabuf); |
219b4733 | 449 | goto out_have_obj; |
3248877e DA |
450 | } |
451 | ||
319c933c DV |
452 | if (obj->dma_buf) { |
453 | get_dma_buf(obj->dma_buf); | |
454 | dmabuf = obj->dma_buf; | |
219b4733 | 455 | goto out_have_obj; |
3248877e | 456 | } |
219b4733 | 457 | |
319c933c | 458 | dmabuf = export_and_register_object(dev, obj, flags); |
4332bf43 | 459 | if (IS_ERR(dmabuf)) { |
219b4733 DA |
460 | /* normally the created dma-buf takes ownership of the ref, |
461 | * but if that fails then drop the ref | |
462 | */ | |
4332bf43 | 463 | ret = PTR_ERR(dmabuf); |
d0b2c533 | 464 | mutex_unlock(&dev->object_name_lock); |
219b4733 DA |
465 | goto out; |
466 | } | |
219b4733 | 467 | |
d0b2c533 DV |
468 | out_have_obj: |
469 | /* | |
470 | * If we've exported this buffer then cheat and add it to the import list | |
471 | * so we get the correct handle back. We must do this under the | |
472 | * protection of dev->object_name_lock to ensure that a racing gem close | |
473 | * ioctl doesn't miss to remove this buffer handle from the cache. | |
0ff926c7 | 474 | */ |
219b4733 | 475 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
319c933c | 476 | dmabuf, handle); |
d0b2c533 | 477 | mutex_unlock(&dev->object_name_lock); |
219b4733 | 478 | if (ret) |
7d8f06ac | 479 | goto fail_put_dmabuf; |
0ff926c7 | 480 | |
d0b2c533 | 481 | out_have_handle: |
4332bf43 | 482 | ret = dma_buf_fd(dmabuf, flags); |
d0b2c533 DV |
483 | /* |
484 | * We must _not_ remove the buffer from the handle cache since the newly | |
485 | * created dma buf is already linked in the global obj->dma_buf pointer, | |
486 | * and that is invariant as long as a userspace gem handle exists. | |
487 | * Closing the handle will clean out the cache anyway, so we don't leak. | |
488 | */ | |
4a88f73f | 489 | if (ret < 0) { |
d0b2c533 | 490 | goto fail_put_dmabuf; |
4a88f73f | 491 | } else { |
da34242e | 492 | *prime_fd = ret; |
4a88f73f DV |
493 | ret = 0; |
494 | } | |
495 | ||
7d8f06ac YC |
496 | goto out; |
497 | ||
498 | fail_put_dmabuf: | |
4332bf43 | 499 | dma_buf_put(dmabuf); |
219b4733 | 500 | out: |
be6ee102 | 501 | drm_gem_object_put(obj); |
d0b2c533 DV |
502 | out_unlock: |
503 | mutex_unlock(&file_priv->prime.lock); | |
504 | ||
b283e92a DV |
505 | return ret; |
506 | } | |
507 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); | |
508 | ||
509 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, | |
510 | struct drm_file *file_priv) | |
511 | { | |
512 | struct drm_prime_handle *args = data; | |
513 | ||
b283e92a DV |
514 | if (!dev->driver->prime_handle_to_fd) |
515 | return -ENOSYS; | |
516 | ||
517 | /* check flags are valid */ | |
518 | if (args->flags & ~(DRM_CLOEXEC | DRM_RDWR)) | |
519 | return -EINVAL; | |
520 | ||
521 | return dev->driver->prime_handle_to_fd(dev, file_priv, | |
522 | args->handle, args->flags, &args->fd); | |
523 | } | |
524 | ||
525 | /** | |
526 | * DOC: PRIME Helpers | |
527 | * | |
805dc614 DV |
528 | * Drivers can implement &drm_gem_object_funcs.export and |
529 | * &drm_driver.gem_prime_import in terms of simpler APIs by using the helper | |
530 | * functions drm_gem_prime_export() and drm_gem_prime_import(). These functions | |
531 | * implement dma-buf support in terms of some lower-level helpers, which are | |
532 | * again exported for drivers to use individually: | |
533 | * | |
534 | * Exporting buffers | |
535 | * ~~~~~~~~~~~~~~~~~ | |
536 | * | |
537 | * Optional pinning of buffers is handled at dma-buf attach and detach time in | |
538 | * drm_gem_map_attach() and drm_gem_map_detach(). Backing storage itself is | |
539 | * handled by drm_gem_map_dma_buf() and drm_gem_unmap_dma_buf(), which relies on | |
540 | * &drm_gem_object_funcs.get_sg_table. | |
541 | * | |
542 | * For kernel-internal access there's drm_gem_dmabuf_vmap() and | |
543 | * drm_gem_dmabuf_vunmap(). Userspace mmap support is provided by | |
544 | * drm_gem_dmabuf_mmap(). | |
b283e92a | 545 | * |
805dc614 DV |
546 | * Note that these export helpers can only be used if the underlying backing |
547 | * storage is fully coherent and either permanently pinned, or it is safe to pin | |
548 | * it indefinitely. | |
b283e92a | 549 | * |
805dc614 | 550 | * FIXME: The underlying helper functions are named rather inconsistently. |
b283e92a | 551 | * |
805dc614 DV |
552 | * Exporting buffers |
553 | * ~~~~~~~~~~~~~~~~~ | |
b283e92a | 554 | * |
805dc614 DV |
555 | * Importing dma-bufs using drm_gem_prime_import() relies on |
556 | * &drm_driver.gem_prime_import_sg_table. | |
557 | * | |
558 | * Note that similarly to the export helpers this permanently pins the | |
559 | * underlying backing storage. Which is ok for scanout, but is not the best | |
560 | * option for sharing lots of buffers for rendering. | |
b283e92a DV |
561 | */ |
562 | ||
563 | /** | |
564 | * drm_gem_map_attach - dma_buf attach implementation for GEM | |
565 | * @dma_buf: buffer to attach device to | |
566 | * @attach: buffer attachment data | |
567 | * | |
805dc614 DV |
568 | * Calls &drm_gem_object_funcs.pin for device specific handling. This can be |
569 | * used as the &dma_buf_ops.attach callback. Must be used together with | |
570 | * drm_gem_map_detach(). | |
b283e92a DV |
571 | * |
572 | * Returns 0 on success, negative error code on failure. | |
573 | */ | |
574 | int drm_gem_map_attach(struct dma_buf *dma_buf, | |
575 | struct dma_buf_attachment *attach) | |
576 | { | |
577 | struct drm_gem_object *obj = dma_buf->priv; | |
578 | ||
579 | return drm_gem_pin(obj); | |
580 | } | |
581 | EXPORT_SYMBOL(drm_gem_map_attach); | |
582 | ||
583 | /** | |
584 | * drm_gem_map_detach - dma_buf detach implementation for GEM | |
585 | * @dma_buf: buffer to detach from | |
586 | * @attach: attachment to be detached | |
587 | * | |
805dc614 DV |
588 | * Calls &drm_gem_object_funcs.pin for device specific handling. Cleans up |
589 | * &dma_buf_attachment from drm_gem_map_attach(). This can be used as the | |
590 | * &dma_buf_ops.detach callback. | |
b283e92a DV |
591 | */ |
592 | void drm_gem_map_detach(struct dma_buf *dma_buf, | |
593 | struct dma_buf_attachment *attach) | |
594 | { | |
595 | struct drm_gem_object *obj = dma_buf->priv; | |
596 | ||
597 | drm_gem_unpin(obj); | |
598 | } | |
599 | EXPORT_SYMBOL(drm_gem_map_detach); | |
600 | ||
601 | /** | |
602 | * drm_gem_map_dma_buf - map_dma_buf implementation for GEM | |
603 | * @attach: attachment whose scatterlist is to be returned | |
604 | * @dir: direction of DMA transfer | |
605 | * | |
805dc614 DV |
606 | * Calls &drm_gem_object_funcs.get_sg_table and then maps the scatterlist. This |
607 | * can be used as the &dma_buf_ops.map_dma_buf callback. Should be used together | |
608 | * with drm_gem_unmap_dma_buf(). | |
b283e92a | 609 | * |
805dc614 | 610 | * Returns:sg_table containing the scatterlist to be returned; returns ERR_PTR |
b283e92a DV |
611 | * on error. May return -EINTR if it is interrupted by a signal. |
612 | */ | |
b283e92a DV |
613 | struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
614 | enum dma_data_direction dir) | |
615 | { | |
616 | struct drm_gem_object *obj = attach->dmabuf->priv; | |
617 | struct sg_table *sgt; | |
6c6fa39c | 618 | int ret; |
b283e92a DV |
619 | |
620 | if (WARN_ON(dir == DMA_NONE)) | |
621 | return ERR_PTR(-EINVAL); | |
622 | ||
d693def4 TZ |
623 | if (WARN_ON(!obj->funcs->get_sg_table)) |
624 | return ERR_PTR(-ENOSYS); | |
625 | ||
626 | sgt = obj->funcs->get_sg_table(obj); | |
627 | if (IS_ERR(sgt)) | |
628 | return sgt; | |
b283e92a | 629 | |
6c6fa39c MS |
630 | ret = dma_map_sgtable(attach->dev, sgt, dir, |
631 | DMA_ATTR_SKIP_CPU_SYNC); | |
632 | if (ret) { | |
b283e92a DV |
633 | sg_free_table(sgt); |
634 | kfree(sgt); | |
6c6fa39c | 635 | sgt = ERR_PTR(ret); |
b283e92a DV |
636 | } |
637 | ||
638 | return sgt; | |
639 | } | |
640 | EXPORT_SYMBOL(drm_gem_map_dma_buf); | |
641 | ||
642 | /** | |
643 | * drm_gem_unmap_dma_buf - unmap_dma_buf implementation for GEM | |
644 | * @attach: attachment to unmap buffer from | |
645 | * @sgt: scatterlist info of the buffer to unmap | |
646 | * @dir: direction of DMA transfer | |
647 | * | |
648 | * This can be used as the &dma_buf_ops.unmap_dma_buf callback. | |
649 | */ | |
650 | void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, | |
651 | struct sg_table *sgt, | |
652 | enum dma_data_direction dir) | |
653 | { | |
654 | if (!sgt) | |
655 | return; | |
656 | ||
6c6fa39c | 657 | dma_unmap_sgtable(attach->dev, sgt, dir, DMA_ATTR_SKIP_CPU_SYNC); |
b283e92a DV |
658 | sg_free_table(sgt); |
659 | kfree(sgt); | |
660 | } | |
661 | EXPORT_SYMBOL(drm_gem_unmap_dma_buf); | |
662 | ||
663 | /** | |
664 | * drm_gem_dmabuf_vmap - dma_buf vmap implementation for GEM | |
665 | * @dma_buf: buffer to be mapped | |
6619ccf1 | 666 | * @map: the virtual address of the buffer |
b283e92a DV |
667 | * |
668 | * Sets up a kernel virtual mapping. This can be used as the &dma_buf_ops.vmap | |
805dc614 | 669 | * callback. Calls into &drm_gem_object_funcs.vmap for device specific handling. |
b283e92a | 670 | * |
805dc614 | 671 | * Returns the kernel virtual address or NULL on failure. |
b283e92a | 672 | */ |
6619ccf1 | 673 | int drm_gem_dmabuf_vmap(struct dma_buf *dma_buf, struct dma_buf_map *map) |
b283e92a DV |
674 | { |
675 | struct drm_gem_object *obj = dma_buf->priv; | |
676 | void *vaddr; | |
677 | ||
678 | vaddr = drm_gem_vmap(obj); | |
679 | if (IS_ERR(vaddr)) | |
6619ccf1 | 680 | return PTR_ERR(vaddr); |
b283e92a | 681 | |
6619ccf1 TZ |
682 | dma_buf_map_set_vaddr(map, vaddr); |
683 | ||
684 | return 0; | |
b283e92a DV |
685 | } |
686 | EXPORT_SYMBOL(drm_gem_dmabuf_vmap); | |
687 | ||
688 | /** | |
689 | * drm_gem_dmabuf_vunmap - dma_buf vunmap implementation for GEM | |
690 | * @dma_buf: buffer to be unmapped | |
20e76f1a | 691 | * @map: the virtual address of the buffer |
b283e92a DV |
692 | * |
693 | * Releases a kernel virtual mapping. This can be used as the | |
805dc614 | 694 | * &dma_buf_ops.vunmap callback. Calls into &drm_gem_object_funcs.vunmap for device specific handling. |
b283e92a | 695 | */ |
20e76f1a | 696 | void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, struct dma_buf_map *map) |
b283e92a DV |
697 | { |
698 | struct drm_gem_object *obj = dma_buf->priv; | |
699 | ||
20e76f1a | 700 | drm_gem_vunmap(obj, map->vaddr); |
b283e92a DV |
701 | } |
702 | EXPORT_SYMBOL(drm_gem_dmabuf_vunmap); | |
703 | ||
704 | /** | |
705 | * drm_gem_prime_mmap - PRIME mmap function for GEM drivers | |
706 | * @obj: GEM object | |
707 | * @vma: Virtual address range | |
708 | * | |
709 | * This function sets up a userspace mapping for PRIME exported buffers using | |
710 | * the same codepath that is used for regular GEM buffer mapping on the DRM fd. | |
711 | * The fake GEM offset is added to vma->vm_pgoff and &drm_driver->fops->mmap is | |
712 | * called to set up the mapping. | |
713 | * | |
714 | * Drivers can use this as their &drm_driver.gem_prime_mmap callback. | |
715 | */ | |
716 | int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) | |
717 | { | |
718 | struct drm_file *priv; | |
719 | struct file *fil; | |
720 | int ret; | |
721 | ||
e5516553 GH |
722 | /* Add the fake offset */ |
723 | vma->vm_pgoff += drm_vma_node_start(&obj->vma_node); | |
724 | ||
c40069cb GH |
725 | if (obj->funcs && obj->funcs->mmap) { |
726 | ret = obj->funcs->mmap(obj, vma); | |
727 | if (ret) | |
728 | return ret; | |
729 | vma->vm_private_data = obj; | |
730 | drm_gem_object_get(obj); | |
731 | return 0; | |
732 | } | |
733 | ||
b283e92a DV |
734 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
735 | fil = kzalloc(sizeof(*fil), GFP_KERNEL); | |
736 | if (!priv || !fil) { | |
737 | ret = -ENOMEM; | |
738 | goto out; | |
739 | } | |
740 | ||
741 | /* Used by drm_gem_mmap() to lookup the GEM object */ | |
742 | priv->minor = obj->dev->primary; | |
743 | fil->private_data = priv; | |
744 | ||
745 | ret = drm_vma_node_allow(&obj->vma_node, priv); | |
746 | if (ret) | |
747 | goto out; | |
748 | ||
b283e92a DV |
749 | ret = obj->dev->driver->fops->mmap(fil, vma); |
750 | ||
751 | drm_vma_node_revoke(&obj->vma_node, priv); | |
752 | out: | |
753 | kfree(priv); | |
754 | kfree(fil); | |
755 | ||
756 | return ret; | |
757 | } | |
758 | EXPORT_SYMBOL(drm_gem_prime_mmap); | |
759 | ||
760 | /** | |
761 | * drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM | |
762 | * @dma_buf: buffer to be mapped | |
763 | * @vma: virtual address range | |
764 | * | |
765 | * Provides memory mapping for the buffer. This can be used as the | |
805dc614 DV |
766 | * &dma_buf_ops.mmap callback. It just forwards to &drm_driver.gem_prime_mmap, |
767 | * which should be set to drm_gem_prime_mmap(). | |
768 | * | |
769 | * FIXME: There's really no point to this wrapper, drivers which need anything | |
770 | * else but drm_gem_prime_mmap can roll their own &dma_buf_ops.mmap callback. | |
b283e92a DV |
771 | * |
772 | * Returns 0 on success or a negative error code on failure. | |
773 | */ | |
774 | int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) | |
775 | { | |
776 | struct drm_gem_object *obj = dma_buf->priv; | |
777 | struct drm_device *dev = obj->dev; | |
778 | ||
779 | if (!dev->driver->gem_prime_mmap) | |
780 | return -ENOSYS; | |
781 | ||
782 | return dev->driver->gem_prime_mmap(obj, vma); | |
3248877e | 783 | } |
b283e92a DV |
784 | EXPORT_SYMBOL(drm_gem_dmabuf_mmap); |
785 | ||
786 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { | |
787 | .cache_sgt_mapping = true, | |
788 | .attach = drm_gem_map_attach, | |
789 | .detach = drm_gem_map_detach, | |
790 | .map_dma_buf = drm_gem_map_dma_buf, | |
791 | .unmap_dma_buf = drm_gem_unmap_dma_buf, | |
792 | .release = drm_gem_dmabuf_release, | |
793 | .mmap = drm_gem_dmabuf_mmap, | |
794 | .vmap = drm_gem_dmabuf_vmap, | |
795 | .vunmap = drm_gem_dmabuf_vunmap, | |
796 | }; | |
3248877e | 797 | |
7698799f | 798 | /** |
b283e92a | 799 | * drm_prime_pages_to_sg - converts a page array into an sg list |
7811a339 | 800 | * @dev: DRM device |
b283e92a DV |
801 | * @pages: pointer to the array of page pointers to convert |
802 | * @nr_pages: length of the page vector | |
7698799f | 803 | * |
b283e92a DV |
804 | * This helper creates an sg table object from a set of pages |
805 | * the driver is responsible for mapping the pages into the | |
806 | * importers address space for use with dma_buf itself. | |
805dc614 DV |
807 | * |
808 | * This is useful for implementing &drm_gem_object_funcs.get_sg_table. | |
7698799f | 809 | */ |
707d561f GH |
810 | struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev, |
811 | struct page **pages, unsigned int nr_pages) | |
7698799f | 812 | { |
a1e16bc7 LT |
813 | struct sg_table *sg; |
814 | struct scatterlist *sge; | |
707d561f | 815 | size_t max_segment = 0; |
7698799f | 816 | |
b283e92a | 817 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); |
a1e16bc7 LT |
818 | if (!sg) |
819 | return ERR_PTR(-ENOMEM); | |
10fdb7d2 | 820 | |
707d561f GH |
821 | if (dev) |
822 | max_segment = dma_max_mapping_size(dev->dev); | |
7a60c2dd JG |
823 | if (max_segment == 0) |
824 | max_segment = UINT_MAX; | |
a1e16bc7 | 825 | sge = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
707d561f | 826 | nr_pages << PAGE_SHIFT, |
a1e16bc7 LT |
827 | max_segment, |
828 | NULL, 0, GFP_KERNEL); | |
829 | if (IS_ERR(sge)) { | |
830 | kfree(sg); | |
831 | sg = ERR_CAST(sge); | |
10fdb7d2 | 832 | } |
b283e92a | 833 | return sg; |
b283e92a DV |
834 | } |
835 | EXPORT_SYMBOL(drm_prime_pages_to_sg); | |
7698799f | 836 | |
d46e7ae2 MS |
837 | /** |
838 | * drm_prime_get_contiguous_size - returns the contiguous size of the buffer | |
839 | * @sgt: sg_table describing the buffer to check | |
840 | * | |
841 | * This helper calculates the contiguous size in the DMA address space | |
842 | * of the the buffer described by the provided sg_table. | |
843 | * | |
844 | * This is useful for implementing | |
845 | * &drm_gem_object_funcs.gem_prime_import_sg_table. | |
846 | */ | |
847 | unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt) | |
848 | { | |
849 | dma_addr_t expected = sg_dma_address(sgt->sgl); | |
850 | struct scatterlist *sg; | |
851 | unsigned long size = 0; | |
852 | int i; | |
853 | ||
854 | for_each_sgtable_dma_sg(sgt, sg, i) { | |
855 | unsigned int len = sg_dma_len(sg); | |
856 | ||
857 | if (!len) | |
858 | break; | |
859 | if (sg_dma_address(sg) != expected) | |
860 | break; | |
861 | expected += len; | |
862 | size += len; | |
863 | } | |
864 | return size; | |
865 | } | |
866 | EXPORT_SYMBOL(drm_prime_get_contiguous_size); | |
867 | ||
b283e92a DV |
868 | /** |
869 | * drm_gem_prime_export - helper library implementation of the export callback | |
b283e92a DV |
870 | * @obj: GEM object to export |
871 | * @flags: flags like DRM_CLOEXEC and DRM_RDWR | |
872 | * | |
805dc614 DV |
873 | * This is the implementation of the &drm_gem_object_funcs.export functions for GEM drivers |
874 | * using the PRIME helpers. It is used as the default in | |
875 | * drm_gem_prime_handle_to_fd(). | |
b283e92a | 876 | */ |
e4fa8457 | 877 | struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj, |
b283e92a DV |
878 | int flags) |
879 | { | |
e4fa8457 | 880 | struct drm_device *dev = obj->dev; |
b283e92a DV |
881 | struct dma_buf_export_info exp_info = { |
882 | .exp_name = KBUILD_MODNAME, /* white lie for debug */ | |
883 | .owner = dev->driver->fops->owner, | |
884 | .ops = &drm_gem_prime_dmabuf_ops, | |
885 | .size = obj->size, | |
886 | .flags = flags, | |
887 | .priv = obj, | |
888 | .resv = obj->resv, | |
889 | }; | |
7698799f | 890 | |
b283e92a | 891 | return drm_gem_dmabuf_export(dev, &exp_info); |
7698799f | 892 | } |
b283e92a | 893 | EXPORT_SYMBOL(drm_gem_prime_export); |
7698799f | 894 | |
39cc344a | 895 | /** |
7e491583 | 896 | * drm_gem_prime_import_dev - core implementation of the import callback |
39cc344a DV |
897 | * @dev: drm_device to import into |
898 | * @dma_buf: dma-buf object to import | |
7e491583 | 899 | * @attach_dev: struct device to dma_buf attach |
39cc344a | 900 | * |
805dc614 DV |
901 | * This is the core of drm_gem_prime_import(). It's designed to be called by |
902 | * drivers who want to use a different device structure than &drm_device.dev for | |
903 | * attaching via dma_buf. This function calls | |
904 | * &drm_driver.gem_prime_import_sg_table internally. | |
905 | * | |
906 | * Drivers must arrange to call drm_prime_gem_destroy() from their | |
907 | * &drm_gem_object_funcs.free hook when using this function. | |
39cc344a | 908 | */ |
7e491583 LA |
909 | struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev, |
910 | struct dma_buf *dma_buf, | |
911 | struct device *attach_dev) | |
89177644 AP |
912 | { |
913 | struct dma_buf_attachment *attach; | |
914 | struct sg_table *sgt; | |
915 | struct drm_gem_object *obj; | |
916 | int ret; | |
917 | ||
89177644 AP |
918 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { |
919 | obj = dma_buf->priv; | |
920 | if (obj->dev == dev) { | |
921 | /* | |
922 | * Importing dmabuf exported from out own gem increases | |
923 | * refcount on gem itself instead of f_count of dmabuf. | |
924 | */ | |
e6b62714 | 925 | drm_gem_object_get(obj); |
89177644 AP |
926 | return obj; |
927 | } | |
928 | } | |
929 | ||
98515035 TF |
930 | if (!dev->driver->gem_prime_import_sg_table) |
931 | return ERR_PTR(-EINVAL); | |
932 | ||
7e491583 | 933 | attach = dma_buf_attach(dma_buf, attach_dev); |
89177644 | 934 | if (IS_ERR(attach)) |
f2a5da4f | 935 | return ERR_CAST(attach); |
89177644 | 936 | |
011c2282 ID |
937 | get_dma_buf(dma_buf); |
938 | ||
89177644 | 939 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
fee0c54e | 940 | if (IS_ERR(sgt)) { |
89177644 AP |
941 | ret = PTR_ERR(sgt); |
942 | goto fail_detach; | |
943 | } | |
944 | ||
b5e9c1a2 | 945 | obj = dev->driver->gem_prime_import_sg_table(dev, attach, sgt); |
89177644 AP |
946 | if (IS_ERR(obj)) { |
947 | ret = PTR_ERR(obj); | |
948 | goto fail_unmap; | |
949 | } | |
950 | ||
951 | obj->import_attach = attach; | |
5f6ed987 | 952 | obj->resv = dma_buf->resv; |
89177644 AP |
953 | |
954 | return obj; | |
955 | ||
956 | fail_unmap: | |
957 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); | |
958 | fail_detach: | |
959 | dma_buf_detach(dma_buf, attach); | |
011c2282 ID |
960 | dma_buf_put(dma_buf); |
961 | ||
89177644 AP |
962 | return ERR_PTR(ret); |
963 | } | |
7e491583 LA |
964 | EXPORT_SYMBOL(drm_gem_prime_import_dev); |
965 | ||
966 | /** | |
967 | * drm_gem_prime_import - helper library implementation of the import callback | |
968 | * @dev: drm_device to import into | |
969 | * @dma_buf: dma-buf object to import | |
970 | * | |
971 | * This is the implementation of the gem_prime_import functions for GEM drivers | |
805dc614 DV |
972 | * using the PRIME helpers. Drivers can use this as their |
973 | * &drm_driver.gem_prime_import implementation. It is used as the default | |
974 | * implementation in drm_gem_prime_fd_to_handle(). | |
975 | * | |
976 | * Drivers must arrange to call drm_prime_gem_destroy() from their | |
977 | * &drm_gem_object_funcs.free hook when using this function. | |
7e491583 LA |
978 | */ |
979 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, | |
980 | struct dma_buf *dma_buf) | |
981 | { | |
982 | return drm_gem_prime_import_dev(dev, dma_buf, dev->dev); | |
983 | } | |
89177644 AP |
984 | EXPORT_SYMBOL(drm_gem_prime_import); |
985 | ||
39cc344a DV |
986 | /** |
987 | * drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array | |
988 | * @sgt: scatter-gather table to convert | |
186ca446 | 989 | * @pages: optional array of page pointers to store the page array in |
39cc344a | 990 | * @addrs: optional array to store the dma bus address of each page |
186ca446 | 991 | * @max_entries: size of both the passed-in arrays |
39cc344a DV |
992 | * |
993 | * Exports an sg table into an array of pages and addresses. This is currently | |
994 | * required by the TTM driver in order to do correct fault handling. | |
805dc614 DV |
995 | * |
996 | * Drivers can use this in their &drm_driver.gem_prime_import_sg_table | |
997 | * implementation. | |
39cc344a | 998 | */ |
51ab7ba2 | 999 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, |
186ca446 | 1000 | dma_addr_t *addrs, int max_entries) |
51ab7ba2 | 1001 | { |
0552daac MS |
1002 | struct sg_dma_page_iter dma_iter; |
1003 | struct sg_page_iter page_iter; | |
1004 | struct page **p = pages; | |
1005 | dma_addr_t *a = addrs; | |
1006 | ||
1007 | if (pages) { | |
1008 | for_each_sgtable_page(sgt, &page_iter, 0) { | |
1009 | if (WARN_ON(p - pages >= max_entries)) | |
51ab7ba2 | 1010 | return -1; |
0552daac | 1011 | *p++ = sg_page_iter_page(&page_iter); |
c0f83d16 | 1012 | } |
0552daac MS |
1013 | } |
1014 | if (addrs) { | |
1015 | for_each_sgtable_dma_page(sgt, &dma_iter, 0) { | |
1016 | if (WARN_ON(a - addrs >= max_entries)) | |
c0f83d16 | 1017 | return -1; |
0552daac | 1018 | *a++ = sg_page_iter_dma_address(&dma_iter); |
51ab7ba2 DA |
1019 | } |
1020 | } | |
0552daac | 1021 | |
51ab7ba2 DA |
1022 | return 0; |
1023 | } | |
1024 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); | |
39cc344a DV |
1025 | |
1026 | /** | |
1027 | * drm_prime_gem_destroy - helper to clean up a PRIME-imported GEM object | |
1028 | * @obj: GEM object which was created from a dma-buf | |
1029 | * @sg: the sg-table which was pinned at import time | |
1030 | * | |
1031 | * This is the cleanup functions which GEM drivers need to call when they use | |
805dc614 | 1032 | * drm_gem_prime_import() or drm_gem_prime_import_dev() to import dma-bufs. |
39cc344a | 1033 | */ |
3248877e DA |
1034 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) |
1035 | { | |
1036 | struct dma_buf_attachment *attach; | |
1037 | struct dma_buf *dma_buf; | |
948de842 | 1038 | |
3248877e DA |
1039 | attach = obj->import_attach; |
1040 | if (sg) | |
1041 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); | |
1042 | dma_buf = attach->dmabuf; | |
1043 | dma_buf_detach(attach->dmabuf, attach); | |
1044 | /* remove the reference */ | |
1045 | dma_buf_put(dma_buf); | |
1046 | } | |
1047 | EXPORT_SYMBOL(drm_prime_gem_destroy); |