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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 | ||
111 | if (drm_mm_init(&mm->offset_manager, DRM_FILE_PAGE_OFFSET_START, | |
112 | DRM_FILE_PAGE_OFFSET_SIZE)) { | |
a2c0a97b | 113 | drm_ht_remove(&mm->offset_hash); |
9a298b2a | 114 | kfree(mm); |
a2c0a97b JB |
115 | return -ENOMEM; |
116 | } | |
117 | ||
673a394b EA |
118 | return 0; |
119 | } | |
120 | ||
a2c0a97b JB |
121 | void |
122 | drm_gem_destroy(struct drm_device *dev) | |
123 | { | |
124 | struct drm_gem_mm *mm = dev->mm_private; | |
125 | ||
126 | drm_mm_takedown(&mm->offset_manager); | |
127 | drm_ht_remove(&mm->offset_hash); | |
9a298b2a | 128 | kfree(mm); |
a2c0a97b JB |
129 | dev->mm_private = NULL; |
130 | } | |
131 | ||
1d397043 | 132 | /** |
62cb7011 | 133 | * Initialize an already allocated GEM object of the specified size with |
1d397043 DV |
134 | * shmfs backing store. |
135 | */ | |
136 | int drm_gem_object_init(struct drm_device *dev, | |
137 | struct drm_gem_object *obj, size_t size) | |
138 | { | |
139 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
140 | ||
141 | obj->dev = dev; | |
142 | obj->filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); | |
143 | if (IS_ERR(obj->filp)) | |
dd8bc93d | 144 | return PTR_ERR(obj->filp); |
1d397043 DV |
145 | |
146 | kref_init(&obj->refcount); | |
29d08b3e | 147 | atomic_set(&obj->handle_count, 0); |
1d397043 DV |
148 | obj->size = size; |
149 | ||
1d397043 DV |
150 | return 0; |
151 | } | |
152 | EXPORT_SYMBOL(drm_gem_object_init); | |
153 | ||
62cb7011 AC |
154 | /** |
155 | * Initialize an already allocated GEM object of the specified size with | |
156 | * no GEM provided backing store. Instead the caller is responsible for | |
157 | * backing the object and handling it. | |
158 | */ | |
159 | int drm_gem_private_object_init(struct drm_device *dev, | |
160 | struct drm_gem_object *obj, size_t size) | |
161 | { | |
162 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
163 | ||
164 | obj->dev = dev; | |
165 | obj->filp = NULL; | |
166 | ||
167 | kref_init(&obj->refcount); | |
168 | atomic_set(&obj->handle_count, 0); | |
169 | obj->size = size; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | EXPORT_SYMBOL(drm_gem_private_object_init); | |
174 | ||
673a394b EA |
175 | /** |
176 | * Allocate a GEM object of the specified size with shmfs backing store | |
177 | */ | |
178 | struct drm_gem_object * | |
179 | drm_gem_object_alloc(struct drm_device *dev, size_t size) | |
180 | { | |
181 | struct drm_gem_object *obj; | |
182 | ||
b798b1fe | 183 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
845792d9 JS |
184 | if (!obj) |
185 | goto free; | |
673a394b | 186 | |
1d397043 | 187 | if (drm_gem_object_init(dev, obj, size) != 0) |
845792d9 | 188 | goto free; |
673a394b | 189 | |
673a394b EA |
190 | if (dev->driver->gem_init_object != NULL && |
191 | dev->driver->gem_init_object(obj) != 0) { | |
845792d9 | 192 | goto fput; |
673a394b | 193 | } |
673a394b | 194 | return obj; |
845792d9 | 195 | fput: |
1d397043 | 196 | /* Object_init mangles the global counters - readjust them. */ |
845792d9 JS |
197 | fput(obj->filp); |
198 | free: | |
199 | kfree(obj); | |
200 | return NULL; | |
673a394b EA |
201 | } |
202 | EXPORT_SYMBOL(drm_gem_object_alloc); | |
203 | ||
0ff926c7 DA |
204 | static void |
205 | drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) | |
206 | { | |
207 | if (obj->import_attach) { | |
219b4733 | 208 | drm_prime_remove_buf_handle(&filp->prime, |
0ff926c7 DA |
209 | obj->import_attach->dmabuf); |
210 | } | |
211 | if (obj->export_dma_buf) { | |
219b4733 | 212 | drm_prime_remove_buf_handle(&filp->prime, |
0ff926c7 DA |
213 | obj->export_dma_buf); |
214 | } | |
215 | } | |
216 | ||
673a394b EA |
217 | /** |
218 | * Removes the mapping from handle to filp for this object. | |
219 | */ | |
ff72145b | 220 | int |
a1a2d1d3 | 221 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b EA |
222 | { |
223 | struct drm_device *dev; | |
224 | struct drm_gem_object *obj; | |
225 | ||
226 | /* This is gross. The idr system doesn't let us try a delete and | |
227 | * return an error code. It just spews if you fail at deleting. | |
228 | * So, we have to grab a lock around finding the object and then | |
229 | * doing the delete on it and dropping the refcount, or the user | |
230 | * could race us to double-decrement the refcount and cause a | |
231 | * use-after-free later. Given the frequency of our handle lookups, | |
232 | * we may want to use ida for number allocation and a hash table | |
233 | * for the pointers, anyway. | |
234 | */ | |
235 | spin_lock(&filp->table_lock); | |
236 | ||
237 | /* Check if we currently have a reference on the object */ | |
238 | obj = idr_find(&filp->object_idr, handle); | |
239 | if (obj == NULL) { | |
240 | spin_unlock(&filp->table_lock); | |
241 | return -EINVAL; | |
242 | } | |
243 | dev = obj->dev; | |
244 | ||
245 | /* Release reference and decrement refcount. */ | |
246 | idr_remove(&filp->object_idr, handle); | |
247 | spin_unlock(&filp->table_lock); | |
248 | ||
0ff926c7 | 249 | drm_gem_remove_prime_handles(obj, filp); |
3248877e | 250 | |
304eda32 BS |
251 | if (dev->driver->gem_close_object) |
252 | dev->driver->gem_close_object(obj, filp); | |
bc9025bd | 253 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
254 | |
255 | return 0; | |
256 | } | |
ff72145b | 257 | EXPORT_SYMBOL(drm_gem_handle_delete); |
673a394b EA |
258 | |
259 | /** | |
260 | * Create a handle for this object. This adds a handle reference | |
261 | * to the object, which includes a regular reference count. Callers | |
262 | * will likely want to dereference the object afterwards. | |
263 | */ | |
264 | int | |
265 | drm_gem_handle_create(struct drm_file *file_priv, | |
266 | struct drm_gem_object *obj, | |
a1a2d1d3 | 267 | u32 *handlep) |
673a394b | 268 | { |
304eda32 BS |
269 | struct drm_device *dev = obj->dev; |
270 | int ret; | |
673a394b EA |
271 | |
272 | /* | |
2e928815 TH |
273 | * Get the user-visible handle using idr. Preload and perform |
274 | * allocation under our spinlock. | |
673a394b | 275 | */ |
2e928815 | 276 | idr_preload(GFP_KERNEL); |
673a394b | 277 | spin_lock(&file_priv->table_lock); |
2e928815 TH |
278 | |
279 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); | |
280 | ||
673a394b | 281 | spin_unlock(&file_priv->table_lock); |
2e928815 TH |
282 | idr_preload_end(); |
283 | if (ret < 0) | |
673a394b | 284 | return ret; |
2e928815 | 285 | *handlep = ret; |
673a394b EA |
286 | |
287 | drm_gem_object_handle_reference(obj); | |
304eda32 BS |
288 | |
289 | if (dev->driver->gem_open_object) { | |
290 | ret = dev->driver->gem_open_object(obj, file_priv); | |
291 | if (ret) { | |
292 | drm_gem_handle_delete(file_priv, *handlep); | |
293 | return ret; | |
294 | } | |
295 | } | |
296 | ||
673a394b EA |
297 | return 0; |
298 | } | |
299 | EXPORT_SYMBOL(drm_gem_handle_create); | |
300 | ||
75ef8b3b RC |
301 | |
302 | /** | |
303 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object | |
304 | * @obj: obj in question | |
305 | * | |
306 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). | |
307 | */ | |
308 | void | |
309 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) | |
310 | { | |
311 | struct drm_device *dev = obj->dev; | |
312 | struct drm_gem_mm *mm = dev->mm_private; | |
313 | struct drm_map_list *list = &obj->map_list; | |
314 | ||
315 | drm_ht_remove_item(&mm->offset_hash, &list->hash); | |
316 | drm_mm_put_block(list->file_offset_node); | |
317 | kfree(list->map); | |
318 | list->map = NULL; | |
319 | } | |
320 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); | |
321 | ||
322 | /** | |
323 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object | |
324 | * @obj: obj in question | |
325 | * | |
326 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
327 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
328 | * up the object based on the offset and sets up the various memory mapping | |
329 | * structures. | |
330 | * | |
331 | * This routine allocates and attaches a fake offset for @obj. | |
332 | */ | |
333 | int | |
334 | drm_gem_create_mmap_offset(struct drm_gem_object *obj) | |
335 | { | |
336 | struct drm_device *dev = obj->dev; | |
337 | struct drm_gem_mm *mm = dev->mm_private; | |
338 | struct drm_map_list *list; | |
339 | struct drm_local_map *map; | |
4a1b0714 | 340 | int ret; |
75ef8b3b RC |
341 | |
342 | /* Set the object up for mmap'ing */ | |
343 | list = &obj->map_list; | |
344 | list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL); | |
345 | if (!list->map) | |
346 | return -ENOMEM; | |
347 | ||
348 | map = list->map; | |
349 | map->type = _DRM_GEM; | |
350 | map->size = obj->size; | |
351 | map->handle = obj; | |
352 | ||
353 | /* Get a DRM GEM mmap offset allocated... */ | |
354 | list->file_offset_node = drm_mm_search_free(&mm->offset_manager, | |
6b9d89b4 | 355 | obj->size / PAGE_SIZE, 0, false); |
75ef8b3b RC |
356 | |
357 | if (!list->file_offset_node) { | |
358 | DRM_ERROR("failed to allocate offset for bo %d\n", obj->name); | |
359 | ret = -ENOSPC; | |
360 | goto out_free_list; | |
361 | } | |
362 | ||
363 | list->file_offset_node = drm_mm_get_block(list->file_offset_node, | |
364 | obj->size / PAGE_SIZE, 0); | |
365 | if (!list->file_offset_node) { | |
366 | ret = -ENOMEM; | |
367 | goto out_free_list; | |
368 | } | |
369 | ||
370 | list->hash.key = list->file_offset_node->start; | |
371 | ret = drm_ht_insert_item(&mm->offset_hash, &list->hash); | |
372 | if (ret) { | |
373 | DRM_ERROR("failed to add to map hash\n"); | |
374 | goto out_free_mm; | |
375 | } | |
376 | ||
377 | return 0; | |
378 | ||
379 | out_free_mm: | |
380 | drm_mm_put_block(list->file_offset_node); | |
381 | out_free_list: | |
382 | kfree(list->map); | |
383 | list->map = NULL; | |
384 | ||
385 | return ret; | |
386 | } | |
387 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); | |
388 | ||
673a394b EA |
389 | /** Returns a reference to the object named by the handle. */ |
390 | struct drm_gem_object * | |
391 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, | |
a1a2d1d3 | 392 | u32 handle) |
673a394b EA |
393 | { |
394 | struct drm_gem_object *obj; | |
395 | ||
396 | spin_lock(&filp->table_lock); | |
397 | ||
398 | /* Check if we currently have a reference on the object */ | |
399 | obj = idr_find(&filp->object_idr, handle); | |
400 | if (obj == NULL) { | |
401 | spin_unlock(&filp->table_lock); | |
402 | return NULL; | |
403 | } | |
404 | ||
405 | drm_gem_object_reference(obj); | |
406 | ||
407 | spin_unlock(&filp->table_lock); | |
408 | ||
409 | return obj; | |
410 | } | |
411 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
412 | ||
413 | /** | |
414 | * Releases the handle to an mm object. | |
415 | */ | |
416 | int | |
417 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
418 | struct drm_file *file_priv) | |
419 | { | |
420 | struct drm_gem_close *args = data; | |
421 | int ret; | |
422 | ||
423 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
424 | return -ENODEV; | |
425 | ||
426 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
427 | ||
428 | return ret; | |
429 | } | |
430 | ||
431 | /** | |
432 | * Create a global name for an object, returning the name. | |
433 | * | |
434 | * Note that the name does not hold a reference; when the object | |
435 | * is freed, the name goes away. | |
436 | */ | |
437 | int | |
438 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
439 | struct drm_file *file_priv) | |
440 | { | |
441 | struct drm_gem_flink *args = data; | |
442 | struct drm_gem_object *obj; | |
443 | int ret; | |
444 | ||
445 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
446 | return -ENODEV; | |
447 | ||
448 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
449 | if (obj == NULL) | |
bf79cb91 | 450 | return -ENOENT; |
673a394b | 451 | |
2e928815 | 452 | idr_preload(GFP_KERNEL); |
673a394b | 453 | spin_lock(&dev->object_name_lock); |
8d59bae5 | 454 | if (!obj->name) { |
2e928815 TH |
455 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); |
456 | obj->name = ret; | |
8d59bae5 | 457 | args->name = (uint64_t) obj->name; |
673a394b | 458 | spin_unlock(&dev->object_name_lock); |
2e928815 | 459 | idr_preload_end(); |
673a394b | 460 | |
2e928815 | 461 | if (ret < 0) |
8d59bae5 | 462 | goto err; |
2e928815 | 463 | ret = 0; |
673a394b | 464 | |
8d59bae5 CW |
465 | /* Allocate a reference for the name table. */ |
466 | drm_gem_object_reference(obj); | |
467 | } else { | |
468 | args->name = (uint64_t) obj->name; | |
469 | spin_unlock(&dev->object_name_lock); | |
2e928815 | 470 | idr_preload_end(); |
8d59bae5 CW |
471 | ret = 0; |
472 | } | |
3e49c4f4 CW |
473 | |
474 | err: | |
bc9025bd | 475 | drm_gem_object_unreference_unlocked(obj); |
3e49c4f4 | 476 | return ret; |
673a394b EA |
477 | } |
478 | ||
479 | /** | |
480 | * Open an object using the global name, returning a handle and the size. | |
481 | * | |
482 | * This handle (of course) holds a reference to the object, so the object | |
483 | * will not go away until the handle is deleted. | |
484 | */ | |
485 | int | |
486 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
487 | struct drm_file *file_priv) | |
488 | { | |
489 | struct drm_gem_open *args = data; | |
490 | struct drm_gem_object *obj; | |
491 | int ret; | |
a1a2d1d3 | 492 | u32 handle; |
673a394b EA |
493 | |
494 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
495 | return -ENODEV; | |
496 | ||
497 | spin_lock(&dev->object_name_lock); | |
498 | obj = idr_find(&dev->object_name_idr, (int) args->name); | |
499 | if (obj) | |
500 | drm_gem_object_reference(obj); | |
501 | spin_unlock(&dev->object_name_lock); | |
502 | if (!obj) | |
503 | return -ENOENT; | |
504 | ||
505 | ret = drm_gem_handle_create(file_priv, obj, &handle); | |
bc9025bd | 506 | drm_gem_object_unreference_unlocked(obj); |
673a394b EA |
507 | if (ret) |
508 | return ret; | |
509 | ||
510 | args->handle = handle; | |
511 | args->size = obj->size; | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
516 | /** | |
517 | * Called at device open time, sets up the structure for handling refcounting | |
518 | * of mm objects. | |
519 | */ | |
520 | void | |
521 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
522 | { | |
523 | idr_init(&file_private->object_idr); | |
524 | spin_lock_init(&file_private->table_lock); | |
525 | } | |
526 | ||
527 | /** | |
528 | * Called at device close to release the file's | |
529 | * handle references on objects. | |
530 | */ | |
531 | static int | |
532 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
533 | { | |
304eda32 | 534 | struct drm_file *file_priv = data; |
673a394b | 535 | struct drm_gem_object *obj = ptr; |
304eda32 BS |
536 | struct drm_device *dev = obj->dev; |
537 | ||
0ff926c7 | 538 | drm_gem_remove_prime_handles(obj, file_priv); |
3248877e | 539 | |
304eda32 BS |
540 | if (dev->driver->gem_close_object) |
541 | dev->driver->gem_close_object(obj, file_priv); | |
673a394b | 542 | |
bc9025bd | 543 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
544 | |
545 | return 0; | |
546 | } | |
547 | ||
548 | /** | |
549 | * Called at close time when the filp is going away. | |
550 | * | |
551 | * Releases any remaining references on objects by this filp. | |
552 | */ | |
553 | void | |
554 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
555 | { | |
673a394b | 556 | idr_for_each(&file_private->object_idr, |
304eda32 | 557 | &drm_gem_object_release_handle, file_private); |
673a394b | 558 | idr_destroy(&file_private->object_idr); |
673a394b EA |
559 | } |
560 | ||
fd632aa3 DV |
561 | void |
562 | drm_gem_object_release(struct drm_gem_object *obj) | |
c3ae90c0 | 563 | { |
62cb7011 AC |
564 | if (obj->filp) |
565 | fput(obj->filp); | |
c3ae90c0 | 566 | } |
fd632aa3 | 567 | EXPORT_SYMBOL(drm_gem_object_release); |
c3ae90c0 | 568 | |
673a394b EA |
569 | /** |
570 | * Called after the last reference to the object has been lost. | |
c3ae90c0 | 571 | * Must be called holding struct_ mutex |
673a394b EA |
572 | * |
573 | * Frees the object | |
574 | */ | |
575 | void | |
576 | drm_gem_object_free(struct kref *kref) | |
577 | { | |
578 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; | |
579 | struct drm_device *dev = obj->dev; | |
580 | ||
581 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); | |
582 | ||
583 | if (dev->driver->gem_free_object != NULL) | |
584 | dev->driver->gem_free_object(obj); | |
673a394b EA |
585 | } |
586 | EXPORT_SYMBOL(drm_gem_object_free); | |
587 | ||
c3ae90c0 LB |
588 | static void drm_gem_object_ref_bug(struct kref *list_kref) |
589 | { | |
590 | BUG(); | |
591 | } | |
592 | ||
673a394b EA |
593 | /** |
594 | * Called after the last handle to the object has been closed | |
595 | * | |
596 | * Removes any name for the object. Note that this must be | |
597 | * called before drm_gem_object_free or we'll be touching | |
598 | * freed memory | |
599 | */ | |
29d08b3e | 600 | void drm_gem_object_handle_free(struct drm_gem_object *obj) |
673a394b | 601 | { |
673a394b EA |
602 | struct drm_device *dev = obj->dev; |
603 | ||
604 | /* Remove any name for this object */ | |
605 | spin_lock(&dev->object_name_lock); | |
606 | if (obj->name) { | |
607 | idr_remove(&dev->object_name_idr, obj->name); | |
8d59bae5 | 608 | obj->name = 0; |
673a394b EA |
609 | spin_unlock(&dev->object_name_lock); |
610 | /* | |
611 | * The object name held a reference to this object, drop | |
612 | * that now. | |
c3ae90c0 LB |
613 | * |
614 | * This cannot be the last reference, since the handle holds one too. | |
673a394b | 615 | */ |
c3ae90c0 | 616 | kref_put(&obj->refcount, drm_gem_object_ref_bug); |
673a394b EA |
617 | } else |
618 | spin_unlock(&dev->object_name_lock); | |
619 | ||
620 | } | |
621 | EXPORT_SYMBOL(drm_gem_object_handle_free); | |
622 | ||
ab00b3e5 JB |
623 | void drm_gem_vm_open(struct vm_area_struct *vma) |
624 | { | |
625 | struct drm_gem_object *obj = vma->vm_private_data; | |
626 | ||
627 | drm_gem_object_reference(obj); | |
31dfbc93 CW |
628 | |
629 | mutex_lock(&obj->dev->struct_mutex); | |
b06d66be | 630 | drm_vm_open_locked(obj->dev, vma); |
31dfbc93 | 631 | mutex_unlock(&obj->dev->struct_mutex); |
ab00b3e5 JB |
632 | } |
633 | EXPORT_SYMBOL(drm_gem_vm_open); | |
634 | ||
635 | void drm_gem_vm_close(struct vm_area_struct *vma) | |
636 | { | |
637 | struct drm_gem_object *obj = vma->vm_private_data; | |
b74ad5ae | 638 | struct drm_device *dev = obj->dev; |
ab00b3e5 | 639 | |
b74ad5ae | 640 | mutex_lock(&dev->struct_mutex); |
b06d66be | 641 | drm_vm_close_locked(obj->dev, vma); |
31dfbc93 | 642 | drm_gem_object_unreference(obj); |
b74ad5ae | 643 | mutex_unlock(&dev->struct_mutex); |
ab00b3e5 JB |
644 | } |
645 | EXPORT_SYMBOL(drm_gem_vm_close); | |
646 | ||
647 | ||
a2c0a97b JB |
648 | /** |
649 | * drm_gem_mmap - memory map routine for GEM objects | |
650 | * @filp: DRM file pointer | |
651 | * @vma: VMA for the area to be mapped | |
652 | * | |
653 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
654 | * descriptor will end up here. | |
655 | * | |
656 | * If we find the object based on the offset passed in (vma->vm_pgoff will | |
657 | * contain the fake offset we created when the GTT map ioctl was called on | |
658 | * the object), we set up the driver fault handler so that any accesses | |
659 | * to the object can be trapped, to perform migration, GTT binding, surface | |
660 | * register allocation, or performance monitoring. | |
661 | */ | |
662 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
663 | { | |
664 | struct drm_file *priv = filp->private_data; | |
665 | struct drm_device *dev = priv->minor->dev; | |
666 | struct drm_gem_mm *mm = dev->mm_private; | |
f77d390c | 667 | struct drm_local_map *map = NULL; |
a2c0a97b JB |
668 | struct drm_gem_object *obj; |
669 | struct drm_hash_item *hash; | |
a2c0a97b JB |
670 | int ret = 0; |
671 | ||
2c07a21d DA |
672 | if (drm_device_is_unplugged(dev)) |
673 | return -ENODEV; | |
674 | ||
a2c0a97b JB |
675 | mutex_lock(&dev->struct_mutex); |
676 | ||
677 | if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &hash)) { | |
678 | mutex_unlock(&dev->struct_mutex); | |
679 | return drm_mmap(filp, vma); | |
680 | } | |
681 | ||
682 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; | |
683 | if (!map || | |
684 | ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) { | |
685 | ret = -EPERM; | |
686 | goto out_unlock; | |
687 | } | |
688 | ||
689 | /* Check for valid size. */ | |
690 | if (map->size < vma->vm_end - vma->vm_start) { | |
691 | ret = -EINVAL; | |
692 | goto out_unlock; | |
693 | } | |
694 | ||
695 | obj = map->handle; | |
696 | if (!obj->dev->driver->gem_vm_ops) { | |
697 | ret = -EINVAL; | |
698 | goto out_unlock; | |
699 | } | |
700 | ||
314e51b9 | 701 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; |
a2c0a97b JB |
702 | vma->vm_ops = obj->dev->driver->gem_vm_ops; |
703 | vma->vm_private_data = map->handle; | |
79cc304f | 704 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
a2c0a97b | 705 | |
ab00b3e5 JB |
706 | /* Take a ref for this mapping of the object, so that the fault |
707 | * handler can dereference the mmap offset's pointer to the object. | |
708 | * This reference is cleaned up by the corresponding vm_close | |
709 | * (which should happen whether the vma was created by this call, or | |
710 | * by a vm_open due to mremap or partial unmap or whatever). | |
711 | */ | |
712 | drm_gem_object_reference(obj); | |
713 | ||
b06d66be | 714 | drm_vm_open_locked(dev, vma); |
a2c0a97b JB |
715 | |
716 | out_unlock: | |
717 | mutex_unlock(&dev->struct_mutex); | |
718 | ||
719 | return ret; | |
720 | } | |
721 | EXPORT_SYMBOL(drm_gem_mmap); |