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673a394b EA |
1 | /* |
2 | * Copyright © 2008 Intel Corporation | |
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 | * Eric Anholt <eric@anholt.net> | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/types.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/uaccess.h> | |
32 | #include <linux/fs.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/module.h> | |
35 | #include <linux/mman.h> | |
36 | #include <linux/pagemap.h> | |
37 | #include "drmP.h" | |
38 | ||
39 | /** @file drm_gem.c | |
40 | * | |
41 | * This file provides some of the base ioctls and library routines for | |
42 | * the graphics memory manager implemented by each device driver. | |
43 | * | |
44 | * Because various devices have different requirements in terms of | |
45 | * synchronization and migration strategies, implementing that is left up to | |
46 | * the driver, and all that the general API provides should be generic -- | |
47 | * allocating objects, reading/writing data with the cpu, freeing objects. | |
48 | * Even there, platform-dependent optimizations for reading/writing data with | |
49 | * the CPU mean we'll likely hook those out to driver-specific calls. However, | |
50 | * the DRI2 implementation wants to have at least allocate/mmap be generic. | |
51 | * | |
52 | * The goal was to have swap-backed object allocation managed through | |
53 | * struct file. However, file descriptors as handles to a struct file have | |
54 | * two major failings: | |
55 | * - Process limits prevent more than 1024 or so being used at a time by | |
56 | * default. | |
57 | * - Inability to allocate high fds will aggravate the X Server's select() | |
58 | * handling, and likely that of many GL client applications as well. | |
59 | * | |
60 | * This led to a plan of using our own integer IDs (called handles, following | |
61 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as | |
62 | * ioctls. The objects themselves will still include the struct file so | |
63 | * that we can transition to fds if the required kernel infrastructure shows | |
64 | * up at a later date, and as our interface with shmfs for memory allocation. | |
65 | */ | |
66 | ||
a2c0a97b JB |
67 | /* |
68 | * We make up offsets for buffer objects so we can recognize them at | |
69 | * mmap time. | |
70 | */ | |
71 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) | |
72 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
73 | ||
673a394b EA |
74 | /** |
75 | * Initialize the GEM device fields | |
76 | */ | |
77 | ||
78 | int | |
79 | drm_gem_init(struct drm_device *dev) | |
80 | { | |
a2c0a97b JB |
81 | struct drm_gem_mm *mm; |
82 | ||
673a394b EA |
83 | spin_lock_init(&dev->object_name_lock); |
84 | idr_init(&dev->object_name_idr); | |
85 | atomic_set(&dev->object_count, 0); | |
86 | atomic_set(&dev->object_memory, 0); | |
87 | atomic_set(&dev->pin_count, 0); | |
88 | atomic_set(&dev->pin_memory, 0); | |
89 | atomic_set(&dev->gtt_count, 0); | |
90 | atomic_set(&dev->gtt_memory, 0); | |
a2c0a97b | 91 | |
9a298b2a | 92 | mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL); |
a2c0a97b JB |
93 | if (!mm) { |
94 | DRM_ERROR("out of memory\n"); | |
95 | return -ENOMEM; | |
96 | } | |
97 | ||
98 | dev->mm_private = mm; | |
99 | ||
100 | if (drm_ht_create(&mm->offset_hash, 19)) { | |
9a298b2a | 101 | kfree(mm); |
a2c0a97b JB |
102 | return -ENOMEM; |
103 | } | |
104 | ||
105 | if (drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START, | |
106 | DRM_FILE_PAGE_OFFSET_SIZE)) { | |
a2c0a97b | 107 | drm_ht_remove(&mm->offset_hash); |
9a298b2a | 108 | kfree(mm); |
a2c0a97b JB |
109 | return -ENOMEM; |
110 | } | |
111 | ||
673a394b EA |
112 | return 0; |
113 | } | |
114 | ||
a2c0a97b JB |
115 | void |
116 | drm_gem_destroy(struct drm_device *dev) | |
117 | { | |
118 | struct drm_gem_mm *mm = dev->mm_private; | |
119 | ||
120 | drm_mm_takedown(&mm->offset_manager); | |
121 | drm_ht_remove(&mm->offset_hash); | |
9a298b2a | 122 | kfree(mm); |
a2c0a97b JB |
123 | dev->mm_private = NULL; |
124 | } | |
125 | ||
673a394b EA |
126 | /** |
127 | * Allocate a GEM object of the specified size with shmfs backing store | |
128 | */ | |
129 | struct drm_gem_object * | |
130 | drm_gem_object_alloc(struct drm_device *dev, size_t size) | |
131 | { | |
132 | struct drm_gem_object *obj; | |
133 | ||
134 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
135 | ||
b798b1fe | 136 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
845792d9 JS |
137 | if (!obj) |
138 | goto free; | |
673a394b EA |
139 | |
140 | obj->dev = dev; | |
fc8744ad | 141 | obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); |
845792d9 JS |
142 | if (IS_ERR(obj->filp)) |
143 | goto free; | |
673a394b EA |
144 | |
145 | kref_init(&obj->refcount); | |
146 | kref_init(&obj->handlecount); | |
147 | obj->size = size; | |
148 | if (dev->driver->gem_init_object != NULL && | |
149 | dev->driver->gem_init_object(obj) != 0) { | |
845792d9 | 150 | goto fput; |
673a394b EA |
151 | } |
152 | atomic_inc(&dev->object_count); | |
153 | atomic_add(obj->size, &dev->object_memory); | |
154 | return obj; | |
845792d9 JS |
155 | fput: |
156 | fput(obj->filp); | |
157 | free: | |
158 | kfree(obj); | |
159 | return NULL; | |
673a394b EA |
160 | } |
161 | EXPORT_SYMBOL(drm_gem_object_alloc); | |
162 | ||
163 | /** | |
164 | * Removes the mapping from handle to filp for this object. | |
165 | */ | |
166 | static int | |
a1a2d1d3 | 167 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b EA |
168 | { |
169 | struct drm_device *dev; | |
170 | struct drm_gem_object *obj; | |
171 | ||
172 | /* This is gross. The idr system doesn't let us try a delete and | |
173 | * return an error code. It just spews if you fail at deleting. | |
174 | * So, we have to grab a lock around finding the object and then | |
175 | * doing the delete on it and dropping the refcount, or the user | |
176 | * could race us to double-decrement the refcount and cause a | |
177 | * use-after-free later. Given the frequency of our handle lookups, | |
178 | * we may want to use ida for number allocation and a hash table | |
179 | * for the pointers, anyway. | |
180 | */ | |
181 | spin_lock(&filp->table_lock); | |
182 | ||
183 | /* Check if we currently have a reference on the object */ | |
184 | obj = idr_find(&filp->object_idr, handle); | |
185 | if (obj == NULL) { | |
186 | spin_unlock(&filp->table_lock); | |
187 | return -EINVAL; | |
188 | } | |
189 | dev = obj->dev; | |
190 | ||
191 | /* Release reference and decrement refcount. */ | |
192 | idr_remove(&filp->object_idr, handle); | |
193 | spin_unlock(&filp->table_lock); | |
194 | ||
bc9025bd | 195 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
200 | /** | |
201 | * Create a handle for this object. This adds a handle reference | |
202 | * to the object, which includes a regular reference count. Callers | |
203 | * will likely want to dereference the object afterwards. | |
204 | */ | |
205 | int | |
206 | drm_gem_handle_create(struct drm_file *file_priv, | |
207 | struct drm_gem_object *obj, | |
a1a2d1d3 | 208 | u32 *handlep) |
673a394b EA |
209 | { |
210 | int ret; | |
211 | ||
212 | /* | |
213 | * Get the user-visible handle using idr. | |
214 | */ | |
215 | again: | |
216 | /* ensure there is space available to allocate a handle */ | |
217 | if (idr_pre_get(&file_priv->object_idr, GFP_KERNEL) == 0) | |
218 | return -ENOMEM; | |
219 | ||
220 | /* do the allocation under our spinlock */ | |
221 | spin_lock(&file_priv->table_lock); | |
a1a2d1d3 | 222 | ret = idr_get_new_above(&file_priv->object_idr, obj, 1, (int *)handlep); |
673a394b EA |
223 | spin_unlock(&file_priv->table_lock); |
224 | if (ret == -EAGAIN) | |
225 | goto again; | |
226 | ||
227 | if (ret != 0) | |
228 | return ret; | |
229 | ||
230 | drm_gem_object_handle_reference(obj); | |
231 | return 0; | |
232 | } | |
233 | EXPORT_SYMBOL(drm_gem_handle_create); | |
234 | ||
235 | /** Returns a reference to the object named by the handle. */ | |
236 | struct drm_gem_object * | |
237 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, | |
a1a2d1d3 | 238 | u32 handle) |
673a394b EA |
239 | { |
240 | struct drm_gem_object *obj; | |
241 | ||
242 | spin_lock(&filp->table_lock); | |
243 | ||
244 | /* Check if we currently have a reference on the object */ | |
245 | obj = idr_find(&filp->object_idr, handle); | |
246 | if (obj == NULL) { | |
247 | spin_unlock(&filp->table_lock); | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | drm_gem_object_reference(obj); | |
252 | ||
253 | spin_unlock(&filp->table_lock); | |
254 | ||
255 | return obj; | |
256 | } | |
257 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
258 | ||
259 | /** | |
260 | * Releases the handle to an mm object. | |
261 | */ | |
262 | int | |
263 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
264 | struct drm_file *file_priv) | |
265 | { | |
266 | struct drm_gem_close *args = data; | |
267 | int ret; | |
268 | ||
269 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
270 | return -ENODEV; | |
271 | ||
272 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | /** | |
278 | * Create a global name for an object, returning the name. | |
279 | * | |
280 | * Note that the name does not hold a reference; when the object | |
281 | * is freed, the name goes away. | |
282 | */ | |
283 | int | |
284 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
285 | struct drm_file *file_priv) | |
286 | { | |
287 | struct drm_gem_flink *args = data; | |
288 | struct drm_gem_object *obj; | |
289 | int ret; | |
290 | ||
291 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
292 | return -ENODEV; | |
293 | ||
294 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
295 | if (obj == NULL) | |
d4e7b898 | 296 | return -EBADF; |
673a394b EA |
297 | |
298 | again: | |
3e49c4f4 CW |
299 | if (idr_pre_get(&dev->object_name_idr, GFP_KERNEL) == 0) { |
300 | ret = -ENOMEM; | |
301 | goto err; | |
302 | } | |
673a394b EA |
303 | |
304 | spin_lock(&dev->object_name_lock); | |
8d59bae5 CW |
305 | if (!obj->name) { |
306 | ret = idr_get_new_above(&dev->object_name_idr, obj, 1, | |
307 | &obj->name); | |
308 | args->name = (uint64_t) obj->name; | |
673a394b | 309 | spin_unlock(&dev->object_name_lock); |
673a394b | 310 | |
8d59bae5 CW |
311 | if (ret == -EAGAIN) |
312 | goto again; | |
673a394b | 313 | |
8d59bae5 CW |
314 | if (ret != 0) |
315 | goto err; | |
673a394b | 316 | |
8d59bae5 CW |
317 | /* Allocate a reference for the name table. */ |
318 | drm_gem_object_reference(obj); | |
319 | } else { | |
320 | args->name = (uint64_t) obj->name; | |
321 | spin_unlock(&dev->object_name_lock); | |
322 | ret = 0; | |
323 | } | |
3e49c4f4 CW |
324 | |
325 | err: | |
bc9025bd | 326 | drm_gem_object_unreference_unlocked(obj); |
3e49c4f4 | 327 | return ret; |
673a394b EA |
328 | } |
329 | ||
330 | /** | |
331 | * Open an object using the global name, returning a handle and the size. | |
332 | * | |
333 | * This handle (of course) holds a reference to the object, so the object | |
334 | * will not go away until the handle is deleted. | |
335 | */ | |
336 | int | |
337 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
338 | struct drm_file *file_priv) | |
339 | { | |
340 | struct drm_gem_open *args = data; | |
341 | struct drm_gem_object *obj; | |
342 | int ret; | |
a1a2d1d3 | 343 | u32 handle; |
673a394b EA |
344 | |
345 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
346 | return -ENODEV; | |
347 | ||
348 | spin_lock(&dev->object_name_lock); | |
349 | obj = idr_find(&dev->object_name_idr, (int) args->name); | |
350 | if (obj) | |
351 | drm_gem_object_reference(obj); | |
352 | spin_unlock(&dev->object_name_lock); | |
353 | if (!obj) | |
354 | return -ENOENT; | |
355 | ||
356 | ret = drm_gem_handle_create(file_priv, obj, &handle); | |
bc9025bd | 357 | drm_gem_object_unreference_unlocked(obj); |
673a394b EA |
358 | if (ret) |
359 | return ret; | |
360 | ||
361 | args->handle = handle; | |
362 | args->size = obj->size; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | /** | |
368 | * Called at device open time, sets up the structure for handling refcounting | |
369 | * of mm objects. | |
370 | */ | |
371 | void | |
372 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
373 | { | |
374 | idr_init(&file_private->object_idr); | |
375 | spin_lock_init(&file_private->table_lock); | |
376 | } | |
377 | ||
378 | /** | |
379 | * Called at device close to release the file's | |
380 | * handle references on objects. | |
381 | */ | |
382 | static int | |
383 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
384 | { | |
385 | struct drm_gem_object *obj = ptr; | |
386 | ||
bc9025bd | 387 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /** | |
393 | * Called at close time when the filp is going away. | |
394 | * | |
395 | * Releases any remaining references on objects by this filp. | |
396 | */ | |
397 | void | |
398 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
399 | { | |
673a394b EA |
400 | idr_for_each(&file_private->object_idr, |
401 | &drm_gem_object_release_handle, NULL); | |
402 | ||
403 | idr_destroy(&file_private->object_idr); | |
673a394b EA |
404 | } |
405 | ||
c3ae90c0 LB |
406 | static void |
407 | drm_gem_object_free_common(struct drm_gem_object *obj) | |
408 | { | |
409 | struct drm_device *dev = obj->dev; | |
410 | fput(obj->filp); | |
411 | atomic_dec(&dev->object_count); | |
412 | atomic_sub(obj->size, &dev->object_memory); | |
413 | kfree(obj); | |
414 | } | |
415 | ||
673a394b EA |
416 | /** |
417 | * Called after the last reference to the object has been lost. | |
c3ae90c0 | 418 | * Must be called holding struct_ mutex |
673a394b EA |
419 | * |
420 | * Frees the object | |
421 | */ | |
422 | void | |
423 | drm_gem_object_free(struct kref *kref) | |
424 | { | |
425 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; | |
426 | struct drm_device *dev = obj->dev; | |
427 | ||
428 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); | |
429 | ||
430 | if (dev->driver->gem_free_object != NULL) | |
431 | dev->driver->gem_free_object(obj); | |
432 | ||
c3ae90c0 | 433 | drm_gem_object_free_common(obj); |
673a394b EA |
434 | } |
435 | EXPORT_SYMBOL(drm_gem_object_free); | |
436 | ||
c3ae90c0 LB |
437 | /** |
438 | * Called after the last reference to the object has been lost. | |
439 | * Must be called without holding struct_mutex | |
440 | * | |
441 | * Frees the object | |
442 | */ | |
443 | void | |
444 | drm_gem_object_free_unlocked(struct kref *kref) | |
445 | { | |
446 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; | |
447 | struct drm_device *dev = obj->dev; | |
448 | ||
449 | if (dev->driver->gem_free_object_unlocked != NULL) | |
450 | dev->driver->gem_free_object_unlocked(obj); | |
451 | else if (dev->driver->gem_free_object != NULL) { | |
452 | mutex_lock(&dev->struct_mutex); | |
453 | dev->driver->gem_free_object(obj); | |
454 | mutex_unlock(&dev->struct_mutex); | |
455 | } | |
456 | ||
457 | drm_gem_object_free_common(obj); | |
458 | } | |
459 | EXPORT_SYMBOL(drm_gem_object_free_unlocked); | |
460 | ||
461 | static void drm_gem_object_ref_bug(struct kref *list_kref) | |
462 | { | |
463 | BUG(); | |
464 | } | |
465 | ||
673a394b EA |
466 | /** |
467 | * Called after the last handle to the object has been closed | |
468 | * | |
469 | * Removes any name for the object. Note that this must be | |
470 | * called before drm_gem_object_free or we'll be touching | |
471 | * freed memory | |
472 | */ | |
473 | void | |
474 | drm_gem_object_handle_free(struct kref *kref) | |
475 | { | |
476 | struct drm_gem_object *obj = container_of(kref, | |
477 | struct drm_gem_object, | |
478 | handlecount); | |
479 | struct drm_device *dev = obj->dev; | |
480 | ||
481 | /* Remove any name for this object */ | |
482 | spin_lock(&dev->object_name_lock); | |
483 | if (obj->name) { | |
484 | idr_remove(&dev->object_name_idr, obj->name); | |
8d59bae5 | 485 | obj->name = 0; |
673a394b EA |
486 | spin_unlock(&dev->object_name_lock); |
487 | /* | |
488 | * The object name held a reference to this object, drop | |
489 | * that now. | |
c3ae90c0 LB |
490 | * |
491 | * This cannot be the last reference, since the handle holds one too. | |
673a394b | 492 | */ |
c3ae90c0 | 493 | kref_put(&obj->refcount, drm_gem_object_ref_bug); |
673a394b EA |
494 | } else |
495 | spin_unlock(&dev->object_name_lock); | |
496 | ||
497 | } | |
498 | EXPORT_SYMBOL(drm_gem_object_handle_free); | |
499 | ||
ab00b3e5 JB |
500 | void drm_gem_vm_open(struct vm_area_struct *vma) |
501 | { | |
502 | struct drm_gem_object *obj = vma->vm_private_data; | |
503 | ||
504 | drm_gem_object_reference(obj); | |
505 | } | |
506 | EXPORT_SYMBOL(drm_gem_vm_open); | |
507 | ||
508 | void drm_gem_vm_close(struct vm_area_struct *vma) | |
509 | { | |
510 | struct drm_gem_object *obj = vma->vm_private_data; | |
ab00b3e5 | 511 | |
bc9025bd | 512 | drm_gem_object_unreference_unlocked(obj); |
ab00b3e5 JB |
513 | } |
514 | EXPORT_SYMBOL(drm_gem_vm_close); | |
515 | ||
516 | ||
a2c0a97b JB |
517 | /** |
518 | * drm_gem_mmap - memory map routine for GEM objects | |
519 | * @filp: DRM file pointer | |
520 | * @vma: VMA for the area to be mapped | |
521 | * | |
522 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
523 | * descriptor will end up here. | |
524 | * | |
525 | * If we find the object based on the offset passed in (vma->vm_pgoff will | |
526 | * contain the fake offset we created when the GTT map ioctl was called on | |
527 | * the object), we set up the driver fault handler so that any accesses | |
528 | * to the object can be trapped, to perform migration, GTT binding, surface | |
529 | * register allocation, or performance monitoring. | |
530 | */ | |
531 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
532 | { | |
533 | struct drm_file *priv = filp->private_data; | |
534 | struct drm_device *dev = priv->minor->dev; | |
535 | struct drm_gem_mm *mm = dev->mm_private; | |
f77d390c | 536 | struct drm_local_map *map = NULL; |
a2c0a97b JB |
537 | struct drm_gem_object *obj; |
538 | struct drm_hash_item *hash; | |
a2c0a97b JB |
539 | int ret = 0; |
540 | ||
541 | mutex_lock(&dev->struct_mutex); | |
542 | ||
543 | if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) { | |
544 | mutex_unlock(&dev->struct_mutex); | |
545 | return drm_mmap(filp, vma); | |
546 | } | |
547 | ||
548 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; | |
549 | if (!map || | |
550 | ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) { | |
551 | ret = -EPERM; | |
552 | goto out_unlock; | |
553 | } | |
554 | ||
555 | /* Check for valid size. */ | |
556 | if (map->size < vma->vm_end - vma->vm_start) { | |
557 | ret = -EINVAL; | |
558 | goto out_unlock; | |
559 | } | |
560 | ||
561 | obj = map->handle; | |
562 | if (!obj->dev->driver->gem_vm_ops) { | |
563 | ret = -EINVAL; | |
564 | goto out_unlock; | |
565 | } | |
566 | ||
567 | vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND; | |
568 | vma->vm_ops = obj->dev->driver->gem_vm_ops; | |
569 | vma->vm_private_data = map->handle; | |
79cc304f | 570 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
a2c0a97b | 571 | |
ab00b3e5 JB |
572 | /* Take a ref for this mapping of the object, so that the fault |
573 | * handler can dereference the mmap offset's pointer to the object. | |
574 | * This reference is cleaned up by the corresponding vm_close | |
575 | * (which should happen whether the vma was created by this call, or | |
576 | * by a vm_open due to mremap or partial unmap or whatever). | |
577 | */ | |
578 | drm_gem_object_reference(obj); | |
579 | ||
a2c0a97b JB |
580 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
581 | drm_vm_open_locked(vma); | |
582 | ||
583 | out_unlock: | |
584 | mutex_unlock(&dev->struct_mutex); | |
585 | ||
586 | return ret; | |
587 | } | |
588 | EXPORT_SYMBOL(drm_gem_mmap); |