]>
Commit | Line | Data |
---|---|---|
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> |
95cf9264 | 39 | #include <linux/mem_encrypt.h> |
760285e7 | 40 | #include <drm/drmP.h> |
0de23977 | 41 | #include <drm/drm_vma_manager.h> |
d9fc9413 | 42 | #include <drm/drm_gem.h> |
67d0ec4e | 43 | #include "drm_internal.h" |
673a394b EA |
44 | |
45 | /** @file drm_gem.c | |
46 | * | |
47 | * This file provides some of the base ioctls and library routines for | |
48 | * the graphics memory manager implemented by each device driver. | |
49 | * | |
50 | * Because various devices have different requirements in terms of | |
51 | * synchronization and migration strategies, implementing that is left up to | |
52 | * the driver, and all that the general API provides should be generic -- | |
53 | * allocating objects, reading/writing data with the cpu, freeing objects. | |
54 | * Even there, platform-dependent optimizations for reading/writing data with | |
55 | * the CPU mean we'll likely hook those out to driver-specific calls. However, | |
56 | * the DRI2 implementation wants to have at least allocate/mmap be generic. | |
57 | * | |
58 | * The goal was to have swap-backed object allocation managed through | |
59 | * struct file. However, file descriptors as handles to a struct file have | |
60 | * two major failings: | |
61 | * - Process limits prevent more than 1024 or so being used at a time by | |
62 | * default. | |
63 | * - Inability to allocate high fds will aggravate the X Server's select() | |
64 | * handling, and likely that of many GL client applications as well. | |
65 | * | |
66 | * This led to a plan of using our own integer IDs (called handles, following | |
67 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as | |
68 | * ioctls. The objects themselves will still include the struct file so | |
69 | * that we can transition to fds if the required kernel infrastructure shows | |
70 | * up at a later date, and as our interface with shmfs for memory allocation. | |
71 | */ | |
72 | ||
a2c0a97b JB |
73 | /* |
74 | * We make up offsets for buffer objects so we can recognize them at | |
75 | * mmap time. | |
76 | */ | |
05269a3a JC |
77 | |
78 | /* pgoff in mmap is an unsigned long, so we need to make sure that | |
79 | * the faked up offset will fit | |
80 | */ | |
81 | ||
82 | #if BITS_PER_LONG == 64 | |
a2c0a97b JB |
83 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
84 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
05269a3a JC |
85 | #else |
86 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) | |
87 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) | |
88 | #endif | |
a2c0a97b | 89 | |
673a394b | 90 | /** |
89d61fc0 DV |
91 | * drm_gem_init - Initialize the GEM device fields |
92 | * @dev: drm_devic structure to initialize | |
673a394b | 93 | */ |
673a394b EA |
94 | int |
95 | drm_gem_init(struct drm_device *dev) | |
96 | { | |
b04a5906 | 97 | struct drm_vma_offset_manager *vma_offset_manager; |
a2c0a97b | 98 | |
cd4f013f | 99 | mutex_init(&dev->object_name_lock); |
673a394b | 100 | idr_init(&dev->object_name_idr); |
a2c0a97b | 101 | |
b04a5906 DV |
102 | vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL); |
103 | if (!vma_offset_manager) { | |
a2c0a97b JB |
104 | DRM_ERROR("out of memory\n"); |
105 | return -ENOMEM; | |
106 | } | |
107 | ||
b04a5906 DV |
108 | dev->vma_offset_manager = vma_offset_manager; |
109 | drm_vma_offset_manager_init(vma_offset_manager, | |
0de23977 DH |
110 | DRM_FILE_PAGE_OFFSET_START, |
111 | DRM_FILE_PAGE_OFFSET_SIZE); | |
a2c0a97b | 112 | |
673a394b EA |
113 | return 0; |
114 | } | |
115 | ||
a2c0a97b JB |
116 | void |
117 | drm_gem_destroy(struct drm_device *dev) | |
118 | { | |
a2c0a97b | 119 | |
b04a5906 DV |
120 | drm_vma_offset_manager_destroy(dev->vma_offset_manager); |
121 | kfree(dev->vma_offset_manager); | |
122 | dev->vma_offset_manager = NULL; | |
a2c0a97b JB |
123 | } |
124 | ||
1d397043 | 125 | /** |
89d61fc0 DV |
126 | * drm_gem_object_init - initialize an allocated shmem-backed GEM object |
127 | * @dev: drm_device the object should be initialized for | |
128 | * @obj: drm_gem_object to initialize | |
129 | * @size: object size | |
130 | * | |
62cb7011 | 131 | * Initialize an already allocated GEM object of the specified size with |
1d397043 DV |
132 | * shmfs backing store. |
133 | */ | |
134 | int drm_gem_object_init(struct drm_device *dev, | |
135 | struct drm_gem_object *obj, size_t size) | |
136 | { | |
89c8233f | 137 | struct file *filp; |
1d397043 | 138 | |
6ab11a26 DV |
139 | drm_gem_private_object_init(dev, obj, size); |
140 | ||
89c8233f DH |
141 | filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); |
142 | if (IS_ERR(filp)) | |
143 | return PTR_ERR(filp); | |
1d397043 | 144 | |
89c8233f | 145 | obj->filp = filp; |
1d397043 | 146 | |
1d397043 DV |
147 | return 0; |
148 | } | |
149 | EXPORT_SYMBOL(drm_gem_object_init); | |
150 | ||
62cb7011 | 151 | /** |
2a5706a3 | 152 | * drm_gem_private_object_init - initialize an allocated private GEM object |
89d61fc0 DV |
153 | * @dev: drm_device the object should be initialized for |
154 | * @obj: drm_gem_object to initialize | |
155 | * @size: object size | |
156 | * | |
62cb7011 AC |
157 | * Initialize an already allocated GEM object of the specified size with |
158 | * no GEM provided backing store. Instead the caller is responsible for | |
159 | * backing the object and handling it. | |
160 | */ | |
89c8233f DH |
161 | void drm_gem_private_object_init(struct drm_device *dev, |
162 | struct drm_gem_object *obj, size_t size) | |
62cb7011 AC |
163 | { |
164 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
165 | ||
166 | obj->dev = dev; | |
167 | obj->filp = NULL; | |
168 | ||
169 | kref_init(&obj->refcount); | |
a8e11d1c | 170 | obj->handle_count = 0; |
62cb7011 | 171 | obj->size = size; |
88d7ebe5 | 172 | drm_vma_node_reset(&obj->vma_node); |
62cb7011 AC |
173 | } |
174 | EXPORT_SYMBOL(drm_gem_private_object_init); | |
175 | ||
0ff926c7 DA |
176 | static void |
177 | drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) | |
178 | { | |
319c933c DV |
179 | /* |
180 | * Note: obj->dma_buf can't disappear as long as we still hold a | |
181 | * handle reference in obj->handle_count. | |
182 | */ | |
d0b2c533 | 183 | mutex_lock(&filp->prime.lock); |
319c933c | 184 | if (obj->dma_buf) { |
d0b2c533 DV |
185 | drm_prime_remove_buf_handle_locked(&filp->prime, |
186 | obj->dma_buf); | |
0ff926c7 | 187 | } |
d0b2c533 | 188 | mutex_unlock(&filp->prime.lock); |
0ff926c7 DA |
189 | } |
190 | ||
36da5908 | 191 | /** |
c6a84325 | 192 | * drm_gem_object_handle_free - release resources bound to userspace handles |
89d61fc0 DV |
193 | * @obj: GEM object to clean up. |
194 | * | |
36da5908 DV |
195 | * Called after the last handle to the object has been closed |
196 | * | |
197 | * Removes any name for the object. Note that this must be | |
198 | * called before drm_gem_object_free or we'll be touching | |
199 | * freed memory | |
200 | */ | |
201 | static void drm_gem_object_handle_free(struct drm_gem_object *obj) | |
202 | { | |
203 | struct drm_device *dev = obj->dev; | |
204 | ||
205 | /* Remove any name for this object */ | |
36da5908 DV |
206 | if (obj->name) { |
207 | idr_remove(&dev->object_name_idr, obj->name); | |
208 | obj->name = 0; | |
a8e11d1c | 209 | } |
36da5908 DV |
210 | } |
211 | ||
319c933c DV |
212 | static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) |
213 | { | |
214 | /* Unbreak the reference cycle if we have an exported dma_buf. */ | |
215 | if (obj->dma_buf) { | |
216 | dma_buf_put(obj->dma_buf); | |
217 | obj->dma_buf = NULL; | |
218 | } | |
219 | } | |
220 | ||
becee2a5 | 221 | static void |
e6b62714 | 222 | drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj) |
36da5908 | 223 | { |
98a8883a CW |
224 | struct drm_device *dev = obj->dev; |
225 | bool final = false; | |
226 | ||
a8e11d1c | 227 | if (WARN_ON(obj->handle_count == 0)) |
36da5908 DV |
228 | return; |
229 | ||
230 | /* | |
231 | * Must bump handle count first as this may be the last | |
232 | * ref, in which case the object would disappear before we | |
233 | * checked for a name | |
234 | */ | |
235 | ||
98a8883a | 236 | mutex_lock(&dev->object_name_lock); |
319c933c | 237 | if (--obj->handle_count == 0) { |
36da5908 | 238 | drm_gem_object_handle_free(obj); |
319c933c | 239 | drm_gem_object_exported_dma_buf_free(obj); |
98a8883a | 240 | final = true; |
319c933c | 241 | } |
98a8883a | 242 | mutex_unlock(&dev->object_name_lock); |
a8e11d1c | 243 | |
98a8883a | 244 | if (final) |
e6b62714 | 245 | drm_gem_object_put_unlocked(obj); |
36da5908 DV |
246 | } |
247 | ||
8815b23a CW |
248 | /* |
249 | * Called at device or object close to release the file's | |
250 | * handle references on objects. | |
251 | */ | |
252 | static int | |
253 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
254 | { | |
255 | struct drm_file *file_priv = data; | |
256 | struct drm_gem_object *obj = ptr; | |
257 | struct drm_device *dev = obj->dev; | |
258 | ||
fe4600a5 CW |
259 | if (dev->driver->gem_close_object) |
260 | dev->driver->gem_close_object(obj, file_priv); | |
261 | ||
8815b23a CW |
262 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
263 | drm_gem_remove_prime_handles(obj, file_priv); | |
d9a1f0b4 | 264 | drm_vma_node_revoke(&obj->vma_node, file_priv); |
8815b23a | 265 | |
e6b62714 | 266 | drm_gem_object_handle_put_unlocked(obj); |
8815b23a CW |
267 | |
268 | return 0; | |
269 | } | |
270 | ||
673a394b | 271 | /** |
89d61fc0 DV |
272 | * drm_gem_handle_delete - deletes the given file-private handle |
273 | * @filp: drm file-private structure to use for the handle look up | |
274 | * @handle: userspace handle to delete | |
275 | * | |
df2e0900 DV |
276 | * Removes the GEM handle from the @filp lookup table which has been added with |
277 | * drm_gem_handle_create(). If this is the last handle also cleans up linked | |
278 | * resources like GEM names. | |
673a394b | 279 | */ |
ff72145b | 280 | int |
a1a2d1d3 | 281 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b | 282 | { |
673a394b EA |
283 | struct drm_gem_object *obj; |
284 | ||
285 | /* This is gross. The idr system doesn't let us try a delete and | |
286 | * return an error code. It just spews if you fail at deleting. | |
287 | * So, we have to grab a lock around finding the object and then | |
288 | * doing the delete on it and dropping the refcount, or the user | |
289 | * could race us to double-decrement the refcount and cause a | |
290 | * use-after-free later. Given the frequency of our handle lookups, | |
291 | * we may want to use ida for number allocation and a hash table | |
292 | * for the pointers, anyway. | |
293 | */ | |
294 | spin_lock(&filp->table_lock); | |
295 | ||
296 | /* Check if we currently have a reference on the object */ | |
f6cd7dae CW |
297 | obj = idr_replace(&filp->object_idr, NULL, handle); |
298 | spin_unlock(&filp->table_lock); | |
299 | if (IS_ERR_OR_NULL(obj)) | |
673a394b | 300 | return -EINVAL; |
673a394b | 301 | |
f6cd7dae CW |
302 | /* Release driver's reference and decrement refcount. */ |
303 | drm_gem_object_release_handle(handle, obj, filp); | |
304 | ||
305 | /* And finally make the handle available for future allocations. */ | |
306 | spin_lock(&filp->table_lock); | |
673a394b EA |
307 | idr_remove(&filp->object_idr, handle); |
308 | spin_unlock(&filp->table_lock); | |
309 | ||
673a394b EA |
310 | return 0; |
311 | } | |
ff72145b | 312 | EXPORT_SYMBOL(drm_gem_handle_delete); |
673a394b | 313 | |
db611527 NT |
314 | /** |
315 | * drm_gem_dumb_map_offset - return the fake mmap offset for a gem object | |
316 | * @file: drm file-private structure containing the gem object | |
317 | * @dev: corresponding drm_device | |
318 | * @handle: gem object handle | |
319 | * @offset: return location for the fake mmap offset | |
320 | * | |
321 | * This implements the &drm_driver.dumb_map_offset kms driver callback for | |
322 | * drivers which use gem to manage their backing storage. | |
323 | * | |
324 | * Returns: | |
325 | * 0 on success or a negative error code on failure. | |
326 | */ | |
327 | int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, | |
328 | u32 handle, u64 *offset) | |
329 | { | |
330 | struct drm_gem_object *obj; | |
331 | int ret; | |
332 | ||
333 | obj = drm_gem_object_lookup(file, handle); | |
334 | if (!obj) | |
335 | return -ENOENT; | |
336 | ||
90378e58 NT |
337 | /* Don't allow imported objects to be mapped */ |
338 | if (obj->import_attach) { | |
339 | ret = -EINVAL; | |
340 | goto out; | |
341 | } | |
342 | ||
db611527 NT |
343 | ret = drm_gem_create_mmap_offset(obj); |
344 | if (ret) | |
345 | goto out; | |
346 | ||
347 | *offset = drm_vma_node_offset_addr(&obj->vma_node); | |
348 | out: | |
349 | drm_gem_object_put_unlocked(obj); | |
350 | ||
351 | return ret; | |
352 | } | |
353 | EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset); | |
354 | ||
43387b37 DV |
355 | /** |
356 | * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers | |
89d61fc0 DV |
357 | * @file: drm file-private structure to remove the dumb handle from |
358 | * @dev: corresponding drm_device | |
359 | * @handle: the dumb handle to remove | |
43387b37 | 360 | * |
940eba2d DV |
361 | * This implements the &drm_driver.dumb_destroy kms driver callback for drivers |
362 | * which use gem to manage their backing storage. | |
43387b37 DV |
363 | */ |
364 | int drm_gem_dumb_destroy(struct drm_file *file, | |
365 | struct drm_device *dev, | |
366 | uint32_t handle) | |
367 | { | |
368 | return drm_gem_handle_delete(file, handle); | |
369 | } | |
370 | EXPORT_SYMBOL(drm_gem_dumb_destroy); | |
371 | ||
673a394b | 372 | /** |
20228c44 | 373 | * drm_gem_handle_create_tail - internal functions to create a handle |
89d61fc0 DV |
374 | * @file_priv: drm file-private structure to register the handle for |
375 | * @obj: object to register | |
8bf8180f | 376 | * @handlep: pointer to return the created handle to the caller |
20228c44 | 377 | * |
940eba2d DV |
378 | * This expects the &drm_device.object_name_lock to be held already and will |
379 | * drop it before returning. Used to avoid races in establishing new handles | |
380 | * when importing an object from either an flink name or a dma-buf. | |
df2e0900 DV |
381 | * |
382 | * Handles must be release again through drm_gem_handle_delete(). This is done | |
383 | * when userspace closes @file_priv for all attached handles, or through the | |
384 | * GEM_CLOSE ioctl for individual handles. | |
673a394b EA |
385 | */ |
386 | int | |
20228c44 DV |
387 | drm_gem_handle_create_tail(struct drm_file *file_priv, |
388 | struct drm_gem_object *obj, | |
389 | u32 *handlep) | |
673a394b | 390 | { |
304eda32 | 391 | struct drm_device *dev = obj->dev; |
9649399e | 392 | u32 handle; |
304eda32 | 393 | int ret; |
673a394b | 394 | |
20228c44 | 395 | WARN_ON(!mutex_is_locked(&dev->object_name_lock)); |
98a8883a | 396 | if (obj->handle_count++ == 0) |
e6b62714 | 397 | drm_gem_object_get(obj); |
20228c44 | 398 | |
673a394b | 399 | /* |
2e928815 TH |
400 | * Get the user-visible handle using idr. Preload and perform |
401 | * allocation under our spinlock. | |
673a394b | 402 | */ |
2e928815 | 403 | idr_preload(GFP_KERNEL); |
673a394b | 404 | spin_lock(&file_priv->table_lock); |
2e928815 TH |
405 | |
406 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); | |
98a8883a | 407 | |
673a394b | 408 | spin_unlock(&file_priv->table_lock); |
2e928815 | 409 | idr_preload_end(); |
98a8883a | 410 | |
cd4f013f | 411 | mutex_unlock(&dev->object_name_lock); |
6984128d CW |
412 | if (ret < 0) |
413 | goto err_unref; | |
414 | ||
9649399e | 415 | handle = ret; |
673a394b | 416 | |
d9a1f0b4 | 417 | ret = drm_vma_node_allow(&obj->vma_node, file_priv); |
6984128d CW |
418 | if (ret) |
419 | goto err_remove; | |
304eda32 BS |
420 | |
421 | if (dev->driver->gem_open_object) { | |
422 | ret = dev->driver->gem_open_object(obj, file_priv); | |
6984128d CW |
423 | if (ret) |
424 | goto err_revoke; | |
304eda32 BS |
425 | } |
426 | ||
9649399e | 427 | *handlep = handle; |
673a394b | 428 | return 0; |
6984128d CW |
429 | |
430 | err_revoke: | |
d9a1f0b4 | 431 | drm_vma_node_revoke(&obj->vma_node, file_priv); |
6984128d CW |
432 | err_remove: |
433 | spin_lock(&file_priv->table_lock); | |
9649399e | 434 | idr_remove(&file_priv->object_idr, handle); |
6984128d CW |
435 | spin_unlock(&file_priv->table_lock); |
436 | err_unref: | |
e6b62714 | 437 | drm_gem_object_handle_put_unlocked(obj); |
6984128d | 438 | return ret; |
673a394b | 439 | } |
20228c44 DV |
440 | |
441 | /** | |
8bf8180f | 442 | * drm_gem_handle_create - create a gem handle for an object |
89d61fc0 DV |
443 | * @file_priv: drm file-private structure to register the handle for |
444 | * @obj: object to register | |
445 | * @handlep: pionter to return the created handle to the caller | |
446 | * | |
20228c44 DV |
447 | * Create a handle for this object. This adds a handle reference |
448 | * to the object, which includes a regular reference count. Callers | |
449 | * will likely want to dereference the object afterwards. | |
450 | */ | |
8bf8180f TR |
451 | int drm_gem_handle_create(struct drm_file *file_priv, |
452 | struct drm_gem_object *obj, | |
453 | u32 *handlep) | |
20228c44 DV |
454 | { |
455 | mutex_lock(&obj->dev->object_name_lock); | |
456 | ||
457 | return drm_gem_handle_create_tail(file_priv, obj, handlep); | |
458 | } | |
673a394b EA |
459 | EXPORT_SYMBOL(drm_gem_handle_create); |
460 | ||
75ef8b3b RC |
461 | |
462 | /** | |
463 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object | |
464 | * @obj: obj in question | |
465 | * | |
466 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). | |
f74418a4 DV |
467 | * |
468 | * Note that drm_gem_object_release() already calls this function, so drivers | |
469 | * don't have to take care of releasing the mmap offset themselves when freeing | |
470 | * the GEM object. | |
75ef8b3b RC |
471 | */ |
472 | void | |
473 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) | |
474 | { | |
475 | struct drm_device *dev = obj->dev; | |
75ef8b3b | 476 | |
b04a5906 | 477 | drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node); |
75ef8b3b RC |
478 | } |
479 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); | |
480 | ||
481 | /** | |
367bbd49 | 482 | * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object |
75ef8b3b | 483 | * @obj: obj in question |
367bbd49 | 484 | * @size: the virtual size |
75ef8b3b RC |
485 | * |
486 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
487 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
488 | * up the object based on the offset and sets up the various memory mapping | |
489 | * structures. | |
490 | * | |
367bbd49 | 491 | * This routine allocates and attaches a fake offset for @obj, in cases where |
940eba2d DV |
492 | * the virtual size differs from the physical size (ie. &drm_gem_object.size). |
493 | * Otherwise just use drm_gem_create_mmap_offset(). | |
f74418a4 DV |
494 | * |
495 | * This function is idempotent and handles an already allocated mmap offset | |
496 | * transparently. Drivers do not need to check for this case. | |
75ef8b3b RC |
497 | */ |
498 | int | |
367bbd49 | 499 | drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) |
75ef8b3b RC |
500 | { |
501 | struct drm_device *dev = obj->dev; | |
75ef8b3b | 502 | |
b04a5906 | 503 | return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node, |
367bbd49 RC |
504 | size / PAGE_SIZE); |
505 | } | |
506 | EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); | |
507 | ||
508 | /** | |
509 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object | |
510 | * @obj: obj in question | |
511 | * | |
512 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
513 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
514 | * up the object based on the offset and sets up the various memory mapping | |
515 | * structures. | |
516 | * | |
517 | * This routine allocates and attaches a fake offset for @obj. | |
f74418a4 DV |
518 | * |
519 | * Drivers can call drm_gem_free_mmap_offset() before freeing @obj to release | |
520 | * the fake offset again. | |
367bbd49 RC |
521 | */ |
522 | int drm_gem_create_mmap_offset(struct drm_gem_object *obj) | |
523 | { | |
524 | return drm_gem_create_mmap_offset_size(obj, obj->size); | |
75ef8b3b RC |
525 | } |
526 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); | |
527 | ||
bcc5c9d5 RC |
528 | /** |
529 | * drm_gem_get_pages - helper to allocate backing pages for a GEM object | |
530 | * from shmem | |
531 | * @obj: obj in question | |
0cdbe8ac DH |
532 | * |
533 | * This reads the page-array of the shmem-backing storage of the given gem | |
534 | * object. An array of pages is returned. If a page is not allocated or | |
535 | * swapped-out, this will allocate/swap-in the required pages. Note that the | |
536 | * whole object is covered by the page-array and pinned in memory. | |
537 | * | |
538 | * Use drm_gem_put_pages() to release the array and unpin all pages. | |
539 | * | |
540 | * This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()). | |
541 | * If you require other GFP-masks, you have to do those allocations yourself. | |
542 | * | |
543 | * Note that you are not allowed to change gfp-zones during runtime. That is, | |
544 | * shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as | |
545 | * set during initialization. If you have special zone constraints, set them | |
546 | * after drm_gem_init_object() via mapping_set_gfp_mask(). shmem-core takes care | |
547 | * to keep pages in the required zone during swap-in. | |
bcc5c9d5 | 548 | */ |
0cdbe8ac | 549 | struct page **drm_gem_get_pages(struct drm_gem_object *obj) |
bcc5c9d5 | 550 | { |
bcc5c9d5 RC |
551 | struct address_space *mapping; |
552 | struct page *p, **pages; | |
553 | int i, npages; | |
554 | ||
555 | /* This is the shared memory object that backs the GEM resource */ | |
93c76a3d | 556 | mapping = obj->filp->f_mapping; |
bcc5c9d5 RC |
557 | |
558 | /* We already BUG_ON() for non-page-aligned sizes in | |
559 | * drm_gem_object_init(), so we should never hit this unless | |
560 | * driver author is doing something really wrong: | |
561 | */ | |
562 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
563 | ||
564 | npages = obj->size >> PAGE_SHIFT; | |
565 | ||
2098105e | 566 | pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); |
bcc5c9d5 RC |
567 | if (pages == NULL) |
568 | return ERR_PTR(-ENOMEM); | |
569 | ||
bcc5c9d5 | 570 | for (i = 0; i < npages; i++) { |
0cdbe8ac | 571 | p = shmem_read_mapping_page(mapping, i); |
bcc5c9d5 RC |
572 | if (IS_ERR(p)) |
573 | goto fail; | |
574 | pages[i] = p; | |
575 | ||
2123000b DH |
576 | /* Make sure shmem keeps __GFP_DMA32 allocated pages in the |
577 | * correct region during swapin. Note that this requires | |
578 | * __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping) | |
579 | * so shmem can relocate pages during swapin if required. | |
bcc5c9d5 | 580 | */ |
c62d2555 | 581 | BUG_ON(mapping_gfp_constraint(mapping, __GFP_DMA32) && |
bcc5c9d5 RC |
582 | (page_to_pfn(p) >= 0x00100000UL)); |
583 | } | |
584 | ||
585 | return pages; | |
586 | ||
587 | fail: | |
588 | while (i--) | |
09cbfeaf | 589 | put_page(pages[i]); |
bcc5c9d5 | 590 | |
2098105e | 591 | kvfree(pages); |
bcc5c9d5 RC |
592 | return ERR_CAST(p); |
593 | } | |
594 | EXPORT_SYMBOL(drm_gem_get_pages); | |
595 | ||
596 | /** | |
597 | * drm_gem_put_pages - helper to free backing pages for a GEM object | |
598 | * @obj: obj in question | |
599 | * @pages: pages to free | |
600 | * @dirty: if true, pages will be marked as dirty | |
601 | * @accessed: if true, the pages will be marked as accessed | |
602 | */ | |
603 | void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, | |
604 | bool dirty, bool accessed) | |
605 | { | |
606 | int i, npages; | |
607 | ||
608 | /* We already BUG_ON() for non-page-aligned sizes in | |
609 | * drm_gem_object_init(), so we should never hit this unless | |
610 | * driver author is doing something really wrong: | |
611 | */ | |
612 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
613 | ||
614 | npages = obj->size >> PAGE_SHIFT; | |
615 | ||
616 | for (i = 0; i < npages; i++) { | |
617 | if (dirty) | |
618 | set_page_dirty(pages[i]); | |
619 | ||
620 | if (accessed) | |
621 | mark_page_accessed(pages[i]); | |
622 | ||
623 | /* Undo the reference we took when populating the table */ | |
09cbfeaf | 624 | put_page(pages[i]); |
bcc5c9d5 RC |
625 | } |
626 | ||
2098105e | 627 | kvfree(pages); |
bcc5c9d5 RC |
628 | } |
629 | EXPORT_SYMBOL(drm_gem_put_pages); | |
630 | ||
df2e0900 DV |
631 | /** |
632 | * drm_gem_object_lookup - look up a GEM object from it's handle | |
df2e0900 DV |
633 | * @filp: DRM file private date |
634 | * @handle: userspace handle | |
635 | * | |
636 | * Returns: | |
637 | * | |
638 | * A reference to the object named by the handle if such exists on @filp, NULL | |
639 | * otherwise. | |
640 | */ | |
673a394b | 641 | struct drm_gem_object * |
a8ad0bd8 | 642 | drm_gem_object_lookup(struct drm_file *filp, u32 handle) |
673a394b EA |
643 | { |
644 | struct drm_gem_object *obj; | |
645 | ||
646 | spin_lock(&filp->table_lock); | |
647 | ||
648 | /* Check if we currently have a reference on the object */ | |
649 | obj = idr_find(&filp->object_idr, handle); | |
a8ad0bd8 | 650 | if (obj) |
e6b62714 | 651 | drm_gem_object_get(obj); |
673a394b EA |
652 | |
653 | spin_unlock(&filp->table_lock); | |
654 | ||
655 | return obj; | |
656 | } | |
657 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
658 | ||
659 | /** | |
89d61fc0 DV |
660 | * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl |
661 | * @dev: drm_device | |
662 | * @data: ioctl data | |
663 | * @file_priv: drm file-private structure | |
664 | * | |
673a394b EA |
665 | * Releases the handle to an mm object. |
666 | */ | |
667 | int | |
668 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
669 | struct drm_file *file_priv) | |
670 | { | |
671 | struct drm_gem_close *args = data; | |
672 | int ret; | |
673 | ||
1bcecfac | 674 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
675 | return -ENODEV; |
676 | ||
677 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
678 | ||
679 | return ret; | |
680 | } | |
681 | ||
682 | /** | |
89d61fc0 DV |
683 | * drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl |
684 | * @dev: drm_device | |
685 | * @data: ioctl data | |
686 | * @file_priv: drm file-private structure | |
687 | * | |
673a394b EA |
688 | * Create a global name for an object, returning the name. |
689 | * | |
690 | * Note that the name does not hold a reference; when the object | |
691 | * is freed, the name goes away. | |
692 | */ | |
693 | int | |
694 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
695 | struct drm_file *file_priv) | |
696 | { | |
697 | struct drm_gem_flink *args = data; | |
698 | struct drm_gem_object *obj; | |
699 | int ret; | |
700 | ||
1bcecfac | 701 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
702 | return -ENODEV; |
703 | ||
a8ad0bd8 | 704 | obj = drm_gem_object_lookup(file_priv, args->handle); |
673a394b | 705 | if (obj == NULL) |
bf79cb91 | 706 | return -ENOENT; |
673a394b | 707 | |
cd4f013f | 708 | mutex_lock(&dev->object_name_lock); |
a8e11d1c DV |
709 | /* prevent races with concurrent gem_close. */ |
710 | if (obj->handle_count == 0) { | |
711 | ret = -ENOENT; | |
712 | goto err; | |
713 | } | |
714 | ||
8d59bae5 | 715 | if (!obj->name) { |
0f646425 | 716 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_KERNEL); |
2e928815 | 717 | if (ret < 0) |
8d59bae5 | 718 | goto err; |
2e07fb22 YC |
719 | |
720 | obj->name = ret; | |
8d59bae5 | 721 | } |
3e49c4f4 | 722 | |
2e07fb22 YC |
723 | args->name = (uint64_t) obj->name; |
724 | ret = 0; | |
725 | ||
3e49c4f4 | 726 | err: |
cd4f013f | 727 | mutex_unlock(&dev->object_name_lock); |
e6b62714 | 728 | drm_gem_object_put_unlocked(obj); |
3e49c4f4 | 729 | return ret; |
673a394b EA |
730 | } |
731 | ||
732 | /** | |
89d61fc0 DV |
733 | * drm_gem_open - implementation of the GEM_OPEN ioctl |
734 | * @dev: drm_device | |
735 | * @data: ioctl data | |
736 | * @file_priv: drm file-private structure | |
737 | * | |
673a394b EA |
738 | * Open an object using the global name, returning a handle and the size. |
739 | * | |
740 | * This handle (of course) holds a reference to the object, so the object | |
741 | * will not go away until the handle is deleted. | |
742 | */ | |
743 | int | |
744 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
745 | struct drm_file *file_priv) | |
746 | { | |
747 | struct drm_gem_open *args = data; | |
748 | struct drm_gem_object *obj; | |
749 | int ret; | |
a1a2d1d3 | 750 | u32 handle; |
673a394b | 751 | |
1bcecfac | 752 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
753 | return -ENODEV; |
754 | ||
cd4f013f | 755 | mutex_lock(&dev->object_name_lock); |
673a394b | 756 | obj = idr_find(&dev->object_name_idr, (int) args->name); |
20228c44 | 757 | if (obj) { |
e6b62714 | 758 | drm_gem_object_get(obj); |
20228c44 DV |
759 | } else { |
760 | mutex_unlock(&dev->object_name_lock); | |
673a394b | 761 | return -ENOENT; |
20228c44 | 762 | } |
673a394b | 763 | |
20228c44 DV |
764 | /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */ |
765 | ret = drm_gem_handle_create_tail(file_priv, obj, &handle); | |
e6b62714 | 766 | drm_gem_object_put_unlocked(obj); |
673a394b EA |
767 | if (ret) |
768 | return ret; | |
769 | ||
770 | args->handle = handle; | |
771 | args->size = obj->size; | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
776 | /** | |
89d61fc0 DV |
777 | * gem_gem_open - initalizes GEM file-private structures at devnode open time |
778 | * @dev: drm_device which is being opened by userspace | |
779 | * @file_private: drm file-private structure to set up | |
780 | * | |
673a394b EA |
781 | * Called at device open time, sets up the structure for handling refcounting |
782 | * of mm objects. | |
783 | */ | |
784 | void | |
785 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
786 | { | |
787 | idr_init(&file_private->object_idr); | |
788 | spin_lock_init(&file_private->table_lock); | |
789 | } | |
790 | ||
673a394b | 791 | /** |
89d61fc0 DV |
792 | * drm_gem_release - release file-private GEM resources |
793 | * @dev: drm_device which is being closed by userspace | |
794 | * @file_private: drm file-private structure to clean up | |
795 | * | |
673a394b EA |
796 | * Called at close time when the filp is going away. |
797 | * | |
798 | * Releases any remaining references on objects by this filp. | |
799 | */ | |
800 | void | |
801 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
802 | { | |
673a394b | 803 | idr_for_each(&file_private->object_idr, |
304eda32 | 804 | &drm_gem_object_release_handle, file_private); |
673a394b | 805 | idr_destroy(&file_private->object_idr); |
673a394b EA |
806 | } |
807 | ||
f74418a4 DV |
808 | /** |
809 | * drm_gem_object_release - release GEM buffer object resources | |
810 | * @obj: GEM buffer object | |
811 | * | |
812 | * This releases any structures and resources used by @obj and is the invers of | |
813 | * drm_gem_object_init(). | |
814 | */ | |
fd632aa3 DV |
815 | void |
816 | drm_gem_object_release(struct drm_gem_object *obj) | |
c3ae90c0 | 817 | { |
319c933c DV |
818 | WARN_ON(obj->dma_buf); |
819 | ||
62cb7011 | 820 | if (obj->filp) |
16d2831d | 821 | fput(obj->filp); |
77472347 DH |
822 | |
823 | drm_gem_free_mmap_offset(obj); | |
c3ae90c0 | 824 | } |
fd632aa3 | 825 | EXPORT_SYMBOL(drm_gem_object_release); |
c3ae90c0 | 826 | |
673a394b | 827 | /** |
89d61fc0 DV |
828 | * drm_gem_object_free - free a GEM object |
829 | * @kref: kref of the object to free | |
830 | * | |
673a394b | 831 | * Called after the last reference to the object has been lost. |
940eba2d | 832 | * Must be called holding &drm_device.struct_mutex. |
673a394b EA |
833 | * |
834 | * Frees the object | |
835 | */ | |
836 | void | |
837 | drm_gem_object_free(struct kref *kref) | |
838 | { | |
6ff774bd DV |
839 | struct drm_gem_object *obj = |
840 | container_of(kref, struct drm_gem_object, refcount); | |
673a394b EA |
841 | struct drm_device *dev = obj->dev; |
842 | ||
6d3e7fdd | 843 | if (dev->driver->gem_free_object_unlocked) { |
9f0ba539 | 844 | dev->driver->gem_free_object_unlocked(obj); |
6d3e7fdd DV |
845 | } else if (dev->driver->gem_free_object) { |
846 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
847 | ||
673a394b | 848 | dev->driver->gem_free_object(obj); |
6d3e7fdd | 849 | } |
673a394b EA |
850 | } |
851 | EXPORT_SYMBOL(drm_gem_object_free); | |
852 | ||
9f0ba539 | 853 | /** |
e6b62714 | 854 | * drm_gem_object_put_unlocked - drop a GEM buffer object reference |
9f0ba539 DV |
855 | * @obj: GEM buffer object |
856 | * | |
857 | * This releases a reference to @obj. Callers must not hold the | |
940eba2d | 858 | * &drm_device.struct_mutex lock when calling this function. |
9f0ba539 | 859 | * |
e6b62714 | 860 | * See also __drm_gem_object_put(). |
9f0ba539 DV |
861 | */ |
862 | void | |
e6b62714 | 863 | drm_gem_object_put_unlocked(struct drm_gem_object *obj) |
9f0ba539 DV |
864 | { |
865 | struct drm_device *dev; | |
866 | ||
867 | if (!obj) | |
868 | return; | |
869 | ||
870 | dev = obj->dev; | |
9f0ba539 | 871 | |
3379c04c | 872 | if (dev->driver->gem_free_object_unlocked) { |
9f0ba539 | 873 | kref_put(&obj->refcount, drm_gem_object_free); |
3379c04c DV |
874 | } else { |
875 | might_lock(&dev->struct_mutex); | |
876 | if (kref_put_mutex(&obj->refcount, drm_gem_object_free, | |
9f0ba539 | 877 | &dev->struct_mutex)) |
3379c04c DV |
878 | mutex_unlock(&dev->struct_mutex); |
879 | } | |
9f0ba539 | 880 | } |
e6b62714 | 881 | EXPORT_SYMBOL(drm_gem_object_put_unlocked); |
9f0ba539 DV |
882 | |
883 | /** | |
e6b62714 | 884 | * drm_gem_object_put - release a GEM buffer object reference |
9f0ba539 DV |
885 | * @obj: GEM buffer object |
886 | * | |
940eba2d DV |
887 | * This releases a reference to @obj. Callers must hold the |
888 | * &drm_device.struct_mutex lock when calling this function, even when the | |
889 | * driver doesn't use &drm_device.struct_mutex for anything. | |
9f0ba539 DV |
890 | * |
891 | * For drivers not encumbered with legacy locking use | |
e6b62714 | 892 | * drm_gem_object_put_unlocked() instead. |
9f0ba539 DV |
893 | */ |
894 | void | |
e6b62714 | 895 | drm_gem_object_put(struct drm_gem_object *obj) |
9f0ba539 DV |
896 | { |
897 | if (obj) { | |
898 | WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); | |
899 | ||
900 | kref_put(&obj->refcount, drm_gem_object_free); | |
901 | } | |
902 | } | |
e6b62714 | 903 | EXPORT_SYMBOL(drm_gem_object_put); |
9f0ba539 | 904 | |
df2e0900 DV |
905 | /** |
906 | * drm_gem_vm_open - vma->ops->open implementation for GEM | |
907 | * @vma: VM area structure | |
908 | * | |
909 | * This function implements the #vm_operations_struct open() callback for GEM | |
910 | * drivers. This must be used together with drm_gem_vm_close(). | |
911 | */ | |
ab00b3e5 JB |
912 | void drm_gem_vm_open(struct vm_area_struct *vma) |
913 | { | |
914 | struct drm_gem_object *obj = vma->vm_private_data; | |
915 | ||
e6b62714 | 916 | drm_gem_object_get(obj); |
ab00b3e5 JB |
917 | } |
918 | EXPORT_SYMBOL(drm_gem_vm_open); | |
919 | ||
df2e0900 DV |
920 | /** |
921 | * drm_gem_vm_close - vma->ops->close implementation for GEM | |
922 | * @vma: VM area structure | |
923 | * | |
924 | * This function implements the #vm_operations_struct close() callback for GEM | |
925 | * drivers. This must be used together with drm_gem_vm_open(). | |
926 | */ | |
ab00b3e5 JB |
927 | void drm_gem_vm_close(struct vm_area_struct *vma) |
928 | { | |
929 | struct drm_gem_object *obj = vma->vm_private_data; | |
ab00b3e5 | 930 | |
e6b62714 | 931 | drm_gem_object_put_unlocked(obj); |
ab00b3e5 JB |
932 | } |
933 | EXPORT_SYMBOL(drm_gem_vm_close); | |
934 | ||
1c5aafa6 LP |
935 | /** |
936 | * drm_gem_mmap_obj - memory map a GEM object | |
937 | * @obj: the GEM object to map | |
938 | * @obj_size: the object size to be mapped, in bytes | |
939 | * @vma: VMA for the area to be mapped | |
940 | * | |
941 | * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops | |
942 | * provided by the driver. Depending on their requirements, drivers can either | |
943 | * provide a fault handler in their gem_vm_ops (in which case any accesses to | |
944 | * the object will be trapped, to perform migration, GTT binding, surface | |
945 | * register allocation, or performance monitoring), or mmap the buffer memory | |
946 | * synchronously after calling drm_gem_mmap_obj. | |
947 | * | |
948 | * This function is mainly intended to implement the DMABUF mmap operation, when | |
949 | * the GEM object is not looked up based on its fake offset. To implement the | |
950 | * DRM mmap operation, drivers should use the drm_gem_mmap() function. | |
951 | * | |
ca481c9b DH |
952 | * drm_gem_mmap_obj() assumes the user is granted access to the buffer while |
953 | * drm_gem_mmap() prevents unprivileged users from mapping random objects. So | |
954 | * callers must verify access restrictions before calling this helper. | |
955 | * | |
1c5aafa6 LP |
956 | * Return 0 or success or -EINVAL if the object size is smaller than the VMA |
957 | * size, or if no gem_vm_ops are provided. | |
958 | */ | |
959 | int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, | |
960 | struct vm_area_struct *vma) | |
961 | { | |
962 | struct drm_device *dev = obj->dev; | |
963 | ||
964 | /* Check for valid size. */ | |
965 | if (obj_size < vma->vm_end - vma->vm_start) | |
966 | return -EINVAL; | |
967 | ||
968 | if (!dev->driver->gem_vm_ops) | |
969 | return -EINVAL; | |
970 | ||
971 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; | |
972 | vma->vm_ops = dev->driver->gem_vm_ops; | |
973 | vma->vm_private_data = obj; | |
16d2831d | 974 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
95cf9264 | 975 | vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); |
1c5aafa6 LP |
976 | |
977 | /* Take a ref for this mapping of the object, so that the fault | |
978 | * handler can dereference the mmap offset's pointer to the object. | |
979 | * This reference is cleaned up by the corresponding vm_close | |
980 | * (which should happen whether the vma was created by this call, or | |
981 | * by a vm_open due to mremap or partial unmap or whatever). | |
982 | */ | |
e6b62714 | 983 | drm_gem_object_get(obj); |
1c5aafa6 | 984 | |
1c5aafa6 LP |
985 | return 0; |
986 | } | |
987 | EXPORT_SYMBOL(drm_gem_mmap_obj); | |
ab00b3e5 | 988 | |
a2c0a97b JB |
989 | /** |
990 | * drm_gem_mmap - memory map routine for GEM objects | |
991 | * @filp: DRM file pointer | |
992 | * @vma: VMA for the area to be mapped | |
993 | * | |
994 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
995 | * descriptor will end up here. | |
996 | * | |
1c5aafa6 | 997 | * Look up the GEM object based on the offset passed in (vma->vm_pgoff will |
a2c0a97b | 998 | * contain the fake offset we created when the GTT map ioctl was called on |
1c5aafa6 | 999 | * the object) and map it with a call to drm_gem_mmap_obj(). |
ca481c9b DH |
1000 | * |
1001 | * If the caller is not granted access to the buffer object, the mmap will fail | |
1002 | * with EACCES. Please see the vma manager for more information. | |
a2c0a97b JB |
1003 | */ |
1004 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
1005 | { | |
1006 | struct drm_file *priv = filp->private_data; | |
1007 | struct drm_device *dev = priv->minor->dev; | |
2225cfe4 | 1008 | struct drm_gem_object *obj = NULL; |
0de23977 | 1009 | struct drm_vma_offset_node *node; |
a8469aa8 | 1010 | int ret; |
a2c0a97b | 1011 | |
c07dcd61 | 1012 | if (drm_dev_is_unplugged(dev)) |
2c07a21d DA |
1013 | return -ENODEV; |
1014 | ||
2225cfe4 DV |
1015 | drm_vma_offset_lock_lookup(dev->vma_offset_manager); |
1016 | node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager, | |
1017 | vma->vm_pgoff, | |
1018 | vma_pages(vma)); | |
1019 | if (likely(node)) { | |
1020 | obj = container_of(node, struct drm_gem_object, vma_node); | |
1021 | /* | |
1022 | * When the object is being freed, after it hits 0-refcnt it | |
1023 | * proceeds to tear down the object. In the process it will | |
1024 | * attempt to remove the VMA offset and so acquire this | |
1025 | * mgr->vm_lock. Therefore if we find an object with a 0-refcnt | |
1026 | * that matches our range, we know it is in the process of being | |
1027 | * destroyed and will be freed as soon as we release the lock - | |
1028 | * so we have to check for the 0-refcnted object and treat it as | |
1029 | * invalid. | |
1030 | */ | |
1031 | if (!kref_get_unless_zero(&obj->refcount)) | |
1032 | obj = NULL; | |
1033 | } | |
1034 | drm_vma_offset_unlock_lookup(dev->vma_offset_manager); | |
a2c0a97b | 1035 | |
2225cfe4 | 1036 | if (!obj) |
197633b9 | 1037 | return -EINVAL; |
2225cfe4 | 1038 | |
d9a1f0b4 | 1039 | if (!drm_vma_node_is_allowed(node, priv)) { |
e6b62714 | 1040 | drm_gem_object_put_unlocked(obj); |
ca481c9b | 1041 | return -EACCES; |
a2c0a97b JB |
1042 | } |
1043 | ||
2225cfe4 DV |
1044 | ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, |
1045 | vma); | |
a2c0a97b | 1046 | |
e6b62714 | 1047 | drm_gem_object_put_unlocked(obj); |
a2c0a97b JB |
1048 | |
1049 | return ret; | |
1050 | } | |
1051 | EXPORT_SYMBOL(drm_gem_mmap); |