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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> | |
5949eac4 | 37 | #include <linux/shmem_fs.h> |
3248877e | 38 | #include <linux/dma-buf.h> |
760285e7 | 39 | #include <drm/drmP.h> |
673a394b EA |
40 | |
41 | /** @file drm_gem.c | |
42 | * | |
43 | * This file provides some of the base ioctls and library routines for | |
44 | * the graphics memory manager implemented by each device driver. | |
45 | * | |
46 | * Because various devices have different requirements in terms of | |
47 | * synchronization and migration strategies, implementing that is left up to | |
48 | * the driver, and all that the general API provides should be generic -- | |
49 | * allocating objects, reading/writing data with the cpu, freeing objects. | |
50 | * Even there, platform-dependent optimizations for reading/writing data with | |
51 | * the CPU mean we'll likely hook those out to driver-specific calls. However, | |
52 | * the DRI2 implementation wants to have at least allocate/mmap be generic. | |
53 | * | |
54 | * The goal was to have swap-backed object allocation managed through | |
55 | * struct file. However, file descriptors as handles to a struct file have | |
56 | * two major failings: | |
57 | * - Process limits prevent more than 1024 or so being used at a time by | |
58 | * default. | |
59 | * - Inability to allocate high fds will aggravate the X Server's select() | |
60 | * handling, and likely that of many GL client applications as well. | |
61 | * | |
62 | * This led to a plan of using our own integer IDs (called handles, following | |
63 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as | |
64 | * ioctls. The objects themselves will still include the struct file so | |
65 | * that we can transition to fds if the required kernel infrastructure shows | |
66 | * up at a later date, and as our interface with shmfs for memory allocation. | |
67 | */ | |
68 | ||
a2c0a97b JB |
69 | /* |
70 | * We make up offsets for buffer objects so we can recognize them at | |
71 | * mmap time. | |
72 | */ | |
05269a3a JC |
73 | |
74 | /* pgoff in mmap is an unsigned long, so we need to make sure that | |
75 | * the faked up offset will fit | |
76 | */ | |
77 | ||
78 | #if BITS_PER_LONG == 64 | |
a2c0a97b JB |
79 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
80 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
05269a3a JC |
81 | #else |
82 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) | |
83 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) | |
84 | #endif | |
a2c0a97b | 85 | |
673a394b EA |
86 | /** |
87 | * Initialize the GEM device fields | |
88 | */ | |
89 | ||
90 | int | |
91 | drm_gem_init(struct drm_device *dev) | |
92 | { | |
a2c0a97b JB |
93 | struct drm_gem_mm *mm; |
94 | ||
673a394b EA |
95 | spin_lock_init(&dev->object_name_lock); |
96 | idr_init(&dev->object_name_idr); | |
a2c0a97b | 97 | |
9a298b2a | 98 | mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL); |
a2c0a97b JB |
99 | if (!mm) { |
100 | DRM_ERROR("out of memory\n"); | |
101 | return -ENOMEM; | |
102 | } | |
103 | ||
104 | dev->mm_private = mm; | |
105 | ||
4cb81ac2 | 106 | if (drm_ht_create(&mm->offset_hash, 12)) { |
9a298b2a | 107 | kfree(mm); |
a2c0a97b JB |
108 | return -ENOMEM; |
109 | } | |
110 | ||
77ef8bbc DH |
111 | drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START, |
112 | DRM_FILE_PAGE_OFFSET_SIZE); | |
a2c0a97b | 113 | |
673a394b EA |
114 | return 0; |
115 | } | |
116 | ||
a2c0a97b JB |
117 | void |
118 | drm_gem_destroy(struct drm_device *dev) | |
119 | { | |
120 | struct drm_gem_mm *mm = dev->mm_private; | |
121 | ||
122 | drm_mm_takedown(&mm->offset_manager); | |
123 | drm_ht_remove(&mm->offset_hash); | |
9a298b2a | 124 | kfree(mm); |
a2c0a97b JB |
125 | dev->mm_private = NULL; |
126 | } | |
127 | ||
1d397043 | 128 | /** |
62cb7011 | 129 | * Initialize an already allocated GEM object of the specified size with |
1d397043 DV |
130 | * shmfs backing store. |
131 | */ | |
132 | int drm_gem_object_init(struct drm_device *dev, | |
133 | struct drm_gem_object *obj, size_t size) | |
134 | { | |
135 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
136 | ||
137 | obj->dev = dev; | |
138 | obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); | |
139 | if (IS_ERR(obj->filp)) | |
dd8bc93d | 140 | return PTR_ERR(obj->filp); |
1d397043 DV |
141 | |
142 | kref_init(&obj->refcount); | |
29d08b3e | 143 | atomic_set(&obj->handle_count, 0); |
1d397043 DV |
144 | obj->size = size; |
145 | ||
1d397043 DV |
146 | return 0; |
147 | } | |
148 | EXPORT_SYMBOL(drm_gem_object_init); | |
149 | ||
62cb7011 AC |
150 | /** |
151 | * Initialize an already allocated GEM object of the specified size with | |
152 | * no GEM provided backing store. Instead the caller is responsible for | |
153 | * backing the object and handling it. | |
154 | */ | |
155 | int drm_gem_private_object_init(struct drm_device *dev, | |
156 | struct drm_gem_object *obj, size_t size) | |
157 | { | |
158 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
159 | ||
160 | obj->dev = dev; | |
161 | obj->filp = NULL; | |
162 | ||
163 | kref_init(&obj->refcount); | |
164 | atomic_set(&obj->handle_count, 0); | |
165 | obj->size = size; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | EXPORT_SYMBOL(drm_gem_private_object_init); | |
170 | ||
673a394b EA |
171 | /** |
172 | * Allocate a GEM object of the specified size with shmfs backing store | |
173 | */ | |
174 | struct drm_gem_object * | |
175 | drm_gem_object_alloc(struct drm_device *dev, size_t size) | |
176 | { | |
177 | struct drm_gem_object *obj; | |
178 | ||
b798b1fe | 179 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
845792d9 JS |
180 | if (!obj) |
181 | goto free; | |
673a394b | 182 | |
1d397043 | 183 | if (drm_gem_object_init(dev, obj, size) != 0) |
845792d9 | 184 | goto free; |
673a394b | 185 | |
673a394b EA |
186 | if (dev->driver->gem_init_object != NULL && |
187 | dev->driver->gem_init_object(obj) != 0) { | |
845792d9 | 188 | goto fput; |
673a394b | 189 | } |
673a394b | 190 | return obj; |
845792d9 | 191 | fput: |
1d397043 | 192 | /* Object_init mangles the global counters - readjust them. */ |
845792d9 JS |
193 | fput(obj->filp); |
194 | free: | |
195 | kfree(obj); | |
196 | return NULL; | |
673a394b EA |
197 | } |
198 | EXPORT_SYMBOL(drm_gem_object_alloc); | |
199 | ||
0ff926c7 DA |
200 | static void |
201 | drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) | |
202 | { | |
203 | if (obj->import_attach) { | |
219b4733 | 204 | drm_prime_remove_buf_handle(&filp->prime, |
0ff926c7 DA |
205 | obj->import_attach->dmabuf); |
206 | } | |
207 | if (obj->export_dma_buf) { | |
219b4733 | 208 | drm_prime_remove_buf_handle(&filp->prime, |
0ff926c7 DA |
209 | obj->export_dma_buf); |
210 | } | |
211 | } | |
212 | ||
673a394b EA |
213 | /** |
214 | * Removes the mapping from handle to filp for this object. | |
215 | */ | |
ff72145b | 216 | int |
a1a2d1d3 | 217 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b EA |
218 | { |
219 | struct drm_device *dev; | |
220 | struct drm_gem_object *obj; | |
221 | ||
222 | /* This is gross. The idr system doesn't let us try a delete and | |
223 | * return an error code. It just spews if you fail at deleting. | |
224 | * So, we have to grab a lock around finding the object and then | |
225 | * doing the delete on it and dropping the refcount, or the user | |
226 | * could race us to double-decrement the refcount and cause a | |
227 | * use-after-free later. Given the frequency of our handle lookups, | |
228 | * we may want to use ida for number allocation and a hash table | |
229 | * for the pointers, anyway. | |
230 | */ | |
231 | spin_lock(&filp->table_lock); | |
232 | ||
233 | /* Check if we currently have a reference on the object */ | |
234 | obj = idr_find(&filp->object_idr, handle); | |
235 | if (obj == NULL) { | |
236 | spin_unlock(&filp->table_lock); | |
237 | return -EINVAL; | |
238 | } | |
239 | dev = obj->dev; | |
240 | ||
241 | /* Release reference and decrement refcount. */ | |
242 | idr_remove(&filp->object_idr, handle); | |
243 | spin_unlock(&filp->table_lock); | |
244 | ||
0ff926c7 | 245 | drm_gem_remove_prime_handles(obj, filp); |
3248877e | 246 | |
304eda32 BS |
247 | if (dev->driver->gem_close_object) |
248 | dev->driver->gem_close_object(obj, filp); | |
bc9025bd | 249 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
250 | |
251 | return 0; | |
252 | } | |
ff72145b | 253 | EXPORT_SYMBOL(drm_gem_handle_delete); |
673a394b EA |
254 | |
255 | /** | |
256 | * Create a handle for this object. This adds a handle reference | |
257 | * to the object, which includes a regular reference count. Callers | |
258 | * will likely want to dereference the object afterwards. | |
259 | */ | |
260 | int | |
261 | drm_gem_handle_create(struct drm_file *file_priv, | |
262 | struct drm_gem_object *obj, | |
a1a2d1d3 | 263 | u32 *handlep) |
673a394b | 264 | { |
304eda32 BS |
265 | struct drm_device *dev = obj->dev; |
266 | int ret; | |
673a394b EA |
267 | |
268 | /* | |
2e928815 TH |
269 | * Get the user-visible handle using idr. Preload and perform |
270 | * allocation under our spinlock. | |
673a394b | 271 | */ |
2e928815 | 272 | idr_preload(GFP_KERNEL); |
673a394b | 273 | spin_lock(&file_priv->table_lock); |
2e928815 TH |
274 | |
275 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); | |
276 | ||
673a394b | 277 | spin_unlock(&file_priv->table_lock); |
2e928815 TH |
278 | idr_preload_end(); |
279 | if (ret < 0) | |
673a394b | 280 | return ret; |
2e928815 | 281 | *handlep = ret; |
673a394b EA |
282 | |
283 | drm_gem_object_handle_reference(obj); | |
304eda32 BS |
284 | |
285 | if (dev->driver->gem_open_object) { | |
286 | ret = dev->driver->gem_open_object(obj, file_priv); | |
287 | if (ret) { | |
288 | drm_gem_handle_delete(file_priv, *handlep); | |
289 | return ret; | |
290 | } | |
291 | } | |
292 | ||
673a394b EA |
293 | return 0; |
294 | } | |
295 | EXPORT_SYMBOL(drm_gem_handle_create); | |
296 | ||
75ef8b3b RC |
297 | |
298 | /** | |
299 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object | |
300 | * @obj: obj in question | |
301 | * | |
302 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). | |
303 | */ | |
304 | void | |
305 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) | |
306 | { | |
307 | struct drm_device *dev = obj->dev; | |
308 | struct drm_gem_mm *mm = dev->mm_private; | |
309 | struct drm_map_list *list = &obj->map_list; | |
310 | ||
311 | drm_ht_remove_item(&mm->offset_hash, &list->hash); | |
312 | drm_mm_put_block(list->file_offset_node); | |
313 | kfree(list->map); | |
314 | list->map = NULL; | |
315 | } | |
316 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); | |
317 | ||
318 | /** | |
319 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object | |
320 | * @obj: obj in question | |
321 | * | |
322 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
323 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
324 | * up the object based on the offset and sets up the various memory mapping | |
325 | * structures. | |
326 | * | |
327 | * This routine allocates and attaches a fake offset for @obj. | |
328 | */ | |
329 | int | |
330 | drm_gem_create_mmap_offset(struct drm_gem_object *obj) | |
331 | { | |
332 | struct drm_device *dev = obj->dev; | |
333 | struct drm_gem_mm *mm = dev->mm_private; | |
334 | struct drm_map_list *list; | |
335 | struct drm_local_map *map; | |
4a1b0714 | 336 | int ret; |
75ef8b3b RC |
337 | |
338 | /* Set the object up for mmap'ing */ | |
339 | list = &obj->map_list; | |
340 | list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL); | |
341 | if (!list->map) | |
342 | return -ENOMEM; | |
343 | ||
344 | map = list->map; | |
345 | map->type = _DRM_GEM; | |
346 | map->size = obj->size; | |
347 | map->handle = obj; | |
348 | ||
349 | /* Get a DRM GEM mmap offset allocated... */ | |
350 | list->file_offset_node = drm_mm_search_free(&mm->offset_manager, | |
6b9d89b4 | 351 | obj->size / PAGE_SIZE, 0, false); |
75ef8b3b RC |
352 | |
353 | if (!list->file_offset_node) { | |
354 | DRM_ERROR("failed to allocate offset for bo %d\n", obj->name); | |
355 | ret = -ENOSPC; | |
356 | goto out_free_list; | |
357 | } | |
358 | ||
359 | list->file_offset_node = drm_mm_get_block(list->file_offset_node, | |
360 | obj->size / PAGE_SIZE, 0); | |
361 | if (!list->file_offset_node) { | |
362 | ret = -ENOMEM; | |
363 | goto out_free_list; | |
364 | } | |
365 | ||
366 | list->hash.key = list->file_offset_node->start; | |
367 | ret = drm_ht_insert_item(&mm->offset_hash, &list->hash); | |
368 | if (ret) { | |
369 | DRM_ERROR("failed to add to map hash\n"); | |
370 | goto out_free_mm; | |
371 | } | |
372 | ||
373 | return 0; | |
374 | ||
375 | out_free_mm: | |
376 | drm_mm_put_block(list->file_offset_node); | |
377 | out_free_list: | |
378 | kfree(list->map); | |
379 | list->map = NULL; | |
380 | ||
381 | return ret; | |
382 | } | |
383 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); | |
384 | ||
673a394b EA |
385 | /** Returns a reference to the object named by the handle. */ |
386 | struct drm_gem_object * | |
387 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, | |
a1a2d1d3 | 388 | u32 handle) |
673a394b EA |
389 | { |
390 | struct drm_gem_object *obj; | |
391 | ||
392 | spin_lock(&filp->table_lock); | |
393 | ||
394 | /* Check if we currently have a reference on the object */ | |
395 | obj = idr_find(&filp->object_idr, handle); | |
396 | if (obj == NULL) { | |
397 | spin_unlock(&filp->table_lock); | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | drm_gem_object_reference(obj); | |
402 | ||
403 | spin_unlock(&filp->table_lock); | |
404 | ||
405 | return obj; | |
406 | } | |
407 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
408 | ||
409 | /** | |
410 | * Releases the handle to an mm object. | |
411 | */ | |
412 | int | |
413 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
414 | struct drm_file *file_priv) | |
415 | { | |
416 | struct drm_gem_close *args = data; | |
417 | int ret; | |
418 | ||
419 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
420 | return -ENODEV; | |
421 | ||
422 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
427 | /** | |
428 | * Create a global name for an object, returning the name. | |
429 | * | |
430 | * Note that the name does not hold a reference; when the object | |
431 | * is freed, the name goes away. | |
432 | */ | |
433 | int | |
434 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
435 | struct drm_file *file_priv) | |
436 | { | |
437 | struct drm_gem_flink *args = data; | |
438 | struct drm_gem_object *obj; | |
439 | int ret; | |
440 | ||
441 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
442 | return -ENODEV; | |
443 | ||
444 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
445 | if (obj == NULL) | |
bf79cb91 | 446 | return -ENOENT; |
673a394b | 447 | |
2e928815 | 448 | idr_preload(GFP_KERNEL); |
673a394b | 449 | spin_lock(&dev->object_name_lock); |
8d59bae5 | 450 | if (!obj->name) { |
2e928815 | 451 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); |
2e928815 | 452 | if (ret < 0) |
8d59bae5 | 453 | goto err; |
2e07fb22 YC |
454 | |
455 | obj->name = ret; | |
673a394b | 456 | |
8d59bae5 CW |
457 | /* Allocate a reference for the name table. */ |
458 | drm_gem_object_reference(obj); | |
8d59bae5 | 459 | } |
3e49c4f4 | 460 | |
2e07fb22 YC |
461 | args->name = (uint64_t) obj->name; |
462 | ret = 0; | |
463 | ||
3e49c4f4 | 464 | err: |
2e07fb22 YC |
465 | spin_unlock(&dev->object_name_lock); |
466 | idr_preload_end(); | |
bc9025bd | 467 | drm_gem_object_unreference_unlocked(obj); |
3e49c4f4 | 468 | return ret; |
673a394b EA |
469 | } |
470 | ||
471 | /** | |
472 | * Open an object using the global name, returning a handle and the size. | |
473 | * | |
474 | * This handle (of course) holds a reference to the object, so the object | |
475 | * will not go away until the handle is deleted. | |
476 | */ | |
477 | int | |
478 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
479 | struct drm_file *file_priv) | |
480 | { | |
481 | struct drm_gem_open *args = data; | |
482 | struct drm_gem_object *obj; | |
483 | int ret; | |
a1a2d1d3 | 484 | u32 handle; |
673a394b EA |
485 | |
486 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
487 | return -ENODEV; | |
488 | ||
489 | spin_lock(&dev->object_name_lock); | |
490 | obj = idr_find(&dev->object_name_idr, (int) args->name); | |
491 | if (obj) | |
492 | drm_gem_object_reference(obj); | |
493 | spin_unlock(&dev->object_name_lock); | |
494 | if (!obj) | |
495 | return -ENOENT; | |
496 | ||
497 | ret = drm_gem_handle_create(file_priv, obj, &handle); | |
bc9025bd | 498 | drm_gem_object_unreference_unlocked(obj); |
673a394b EA |
499 | if (ret) |
500 | return ret; | |
501 | ||
502 | args->handle = handle; | |
503 | args->size = obj->size; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | /** | |
509 | * Called at device open time, sets up the structure for handling refcounting | |
510 | * of mm objects. | |
511 | */ | |
512 | void | |
513 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
514 | { | |
515 | idr_init(&file_private->object_idr); | |
516 | spin_lock_init(&file_private->table_lock); | |
517 | } | |
518 | ||
519 | /** | |
520 | * Called at device close to release the file's | |
521 | * handle references on objects. | |
522 | */ | |
523 | static int | |
524 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
525 | { | |
304eda32 | 526 | struct drm_file *file_priv = data; |
673a394b | 527 | struct drm_gem_object *obj = ptr; |
304eda32 BS |
528 | struct drm_device *dev = obj->dev; |
529 | ||
0ff926c7 | 530 | drm_gem_remove_prime_handles(obj, file_priv); |
3248877e | 531 | |
304eda32 BS |
532 | if (dev->driver->gem_close_object) |
533 | dev->driver->gem_close_object(obj, file_priv); | |
673a394b | 534 | |
bc9025bd | 535 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
536 | |
537 | return 0; | |
538 | } | |
539 | ||
540 | /** | |
541 | * Called at close time when the filp is going away. | |
542 | * | |
543 | * Releases any remaining references on objects by this filp. | |
544 | */ | |
545 | void | |
546 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
547 | { | |
673a394b | 548 | idr_for_each(&file_private->object_idr, |
304eda32 | 549 | &drm_gem_object_release_handle, file_private); |
673a394b | 550 | idr_destroy(&file_private->object_idr); |
673a394b EA |
551 | } |
552 | ||
fd632aa3 DV |
553 | void |
554 | drm_gem_object_release(struct drm_gem_object *obj) | |
c3ae90c0 | 555 | { |
62cb7011 AC |
556 | if (obj->filp) |
557 | fput(obj->filp); | |
c3ae90c0 | 558 | } |
fd632aa3 | 559 | EXPORT_SYMBOL(drm_gem_object_release); |
c3ae90c0 | 560 | |
673a394b EA |
561 | /** |
562 | * Called after the last reference to the object has been lost. | |
c3ae90c0 | 563 | * Must be called holding struct_ mutex |
673a394b EA |
564 | * |
565 | * Frees the object | |
566 | */ | |
567 | void | |
568 | drm_gem_object_free(struct kref *kref) | |
569 | { | |
570 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; | |
571 | struct drm_device *dev = obj->dev; | |
572 | ||
573 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); | |
574 | ||
575 | if (dev->driver->gem_free_object != NULL) | |
576 | dev->driver->gem_free_object(obj); | |
673a394b EA |
577 | } |
578 | EXPORT_SYMBOL(drm_gem_object_free); | |
579 | ||
c3ae90c0 LB |
580 | static void drm_gem_object_ref_bug(struct kref *list_kref) |
581 | { | |
582 | BUG(); | |
583 | } | |
584 | ||
673a394b EA |
585 | /** |
586 | * Called after the last handle to the object has been closed | |
587 | * | |
588 | * Removes any name for the object. Note that this must be | |
589 | * called before drm_gem_object_free or we'll be touching | |
590 | * freed memory | |
591 | */ | |
29d08b3e | 592 | void drm_gem_object_handle_free(struct drm_gem_object *obj) |
673a394b | 593 | { |
673a394b EA |
594 | struct drm_device *dev = obj->dev; |
595 | ||
596 | /* Remove any name for this object */ | |
597 | spin_lock(&dev->object_name_lock); | |
598 | if (obj->name) { | |
599 | idr_remove(&dev->object_name_idr, obj->name); | |
8d59bae5 | 600 | obj->name = 0; |
673a394b EA |
601 | spin_unlock(&dev->object_name_lock); |
602 | /* | |
603 | * The object name held a reference to this object, drop | |
604 | * that now. | |
c3ae90c0 LB |
605 | * |
606 | * This cannot be the last reference, since the handle holds one too. | |
673a394b | 607 | */ |
c3ae90c0 | 608 | kref_put(&obj->refcount, drm_gem_object_ref_bug); |
673a394b EA |
609 | } else |
610 | spin_unlock(&dev->object_name_lock); | |
611 | ||
612 | } | |
613 | EXPORT_SYMBOL(drm_gem_object_handle_free); | |
614 | ||
ab00b3e5 JB |
615 | void drm_gem_vm_open(struct vm_area_struct *vma) |
616 | { | |
617 | struct drm_gem_object *obj = vma->vm_private_data; | |
618 | ||
619 | drm_gem_object_reference(obj); | |
31dfbc93 CW |
620 | |
621 | mutex_lock(&obj->dev->struct_mutex); | |
b06d66be | 622 | drm_vm_open_locked(obj->dev, vma); |
31dfbc93 | 623 | mutex_unlock(&obj->dev->struct_mutex); |
ab00b3e5 JB |
624 | } |
625 | EXPORT_SYMBOL(drm_gem_vm_open); | |
626 | ||
627 | void drm_gem_vm_close(struct vm_area_struct *vma) | |
628 | { | |
629 | struct drm_gem_object *obj = vma->vm_private_data; | |
b74ad5ae | 630 | struct drm_device *dev = obj->dev; |
ab00b3e5 | 631 | |
b74ad5ae | 632 | mutex_lock(&dev->struct_mutex); |
b06d66be | 633 | drm_vm_close_locked(obj->dev, vma); |
31dfbc93 | 634 | drm_gem_object_unreference(obj); |
b74ad5ae | 635 | mutex_unlock(&dev->struct_mutex); |
ab00b3e5 JB |
636 | } |
637 | EXPORT_SYMBOL(drm_gem_vm_close); | |
638 | ||
1c5aafa6 LP |
639 | /** |
640 | * drm_gem_mmap_obj - memory map a GEM object | |
641 | * @obj: the GEM object to map | |
642 | * @obj_size: the object size to be mapped, in bytes | |
643 | * @vma: VMA for the area to be mapped | |
644 | * | |
645 | * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops | |
646 | * provided by the driver. Depending on their requirements, drivers can either | |
647 | * provide a fault handler in their gem_vm_ops (in which case any accesses to | |
648 | * the object will be trapped, to perform migration, GTT binding, surface | |
649 | * register allocation, or performance monitoring), or mmap the buffer memory | |
650 | * synchronously after calling drm_gem_mmap_obj. | |
651 | * | |
652 | * This function is mainly intended to implement the DMABUF mmap operation, when | |
653 | * the GEM object is not looked up based on its fake offset. To implement the | |
654 | * DRM mmap operation, drivers should use the drm_gem_mmap() function. | |
655 | * | |
4368dd84 YC |
656 | * NOTE: This function has to be protected with dev->struct_mutex |
657 | * | |
1c5aafa6 LP |
658 | * Return 0 or success or -EINVAL if the object size is smaller than the VMA |
659 | * size, or if no gem_vm_ops are provided. | |
660 | */ | |
661 | int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, | |
662 | struct vm_area_struct *vma) | |
663 | { | |
664 | struct drm_device *dev = obj->dev; | |
665 | ||
4368dd84 YC |
666 | lockdep_assert_held(&dev->struct_mutex); |
667 | ||
1c5aafa6 LP |
668 | /* Check for valid size. */ |
669 | if (obj_size < vma->vm_end - vma->vm_start) | |
670 | return -EINVAL; | |
671 | ||
672 | if (!dev->driver->gem_vm_ops) | |
673 | return -EINVAL; | |
674 | ||
675 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; | |
676 | vma->vm_ops = dev->driver->gem_vm_ops; | |
677 | vma->vm_private_data = obj; | |
678 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); | |
679 | ||
680 | /* Take a ref for this mapping of the object, so that the fault | |
681 | * handler can dereference the mmap offset's pointer to the object. | |
682 | * This reference is cleaned up by the corresponding vm_close | |
683 | * (which should happen whether the vma was created by this call, or | |
684 | * by a vm_open due to mremap or partial unmap or whatever). | |
685 | */ | |
686 | drm_gem_object_reference(obj); | |
687 | ||
688 | drm_vm_open_locked(dev, vma); | |
689 | return 0; | |
690 | } | |
691 | EXPORT_SYMBOL(drm_gem_mmap_obj); | |
ab00b3e5 | 692 | |
a2c0a97b JB |
693 | /** |
694 | * drm_gem_mmap - memory map routine for GEM objects | |
695 | * @filp: DRM file pointer | |
696 | * @vma: VMA for the area to be mapped | |
697 | * | |
698 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
699 | * descriptor will end up here. | |
700 | * | |
1c5aafa6 | 701 | * Look up the GEM object based on the offset passed in (vma->vm_pgoff will |
a2c0a97b | 702 | * contain the fake offset we created when the GTT map ioctl was called on |
1c5aafa6 | 703 | * the object) and map it with a call to drm_gem_mmap_obj(). |
a2c0a97b JB |
704 | */ |
705 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
706 | { | |
707 | struct drm_file *priv = filp->private_data; | |
708 | struct drm_device *dev = priv->minor->dev; | |
709 | struct drm_gem_mm *mm = dev->mm_private; | |
f77d390c | 710 | struct drm_local_map *map = NULL; |
a2c0a97b | 711 | struct drm_hash_item *hash; |
a2c0a97b JB |
712 | int ret = 0; |
713 | ||
2c07a21d DA |
714 | if (drm_device_is_unplugged(dev)) |
715 | return -ENODEV; | |
716 | ||
a2c0a97b JB |
717 | mutex_lock(&dev->struct_mutex); |
718 | ||
719 | if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) { | |
720 | mutex_unlock(&dev->struct_mutex); | |
721 | return drm_mmap(filp, vma); | |
722 | } | |
723 | ||
724 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; | |
725 | if (!map || | |
726 | ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) { | |
727 | ret = -EPERM; | |
728 | goto out_unlock; | |
729 | } | |
730 | ||
1c5aafa6 | 731 | ret = drm_gem_mmap_obj(map->handle, map->size, vma); |
a2c0a97b JB |
732 | |
733 | out_unlock: | |
734 | mutex_unlock(&dev->struct_mutex); | |
735 | ||
736 | return ret; | |
737 | } | |
738 | EXPORT_SYMBOL(drm_gem_mmap); |