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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> |
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> |
45d58b40 | 43 | #include <drm/drm_print.h> |
67d0ec4e | 44 | #include "drm_internal.h" |
673a394b EA |
45 | |
46 | /** @file drm_gem.c | |
47 | * | |
48 | * This file provides some of the base ioctls and library routines for | |
49 | * the graphics memory manager implemented by each device driver. | |
50 | * | |
51 | * Because various devices have different requirements in terms of | |
52 | * synchronization and migration strategies, implementing that is left up to | |
53 | * the driver, and all that the general API provides should be generic -- | |
54 | * allocating objects, reading/writing data with the cpu, freeing objects. | |
55 | * Even there, platform-dependent optimizations for reading/writing data with | |
56 | * the CPU mean we'll likely hook those out to driver-specific calls. However, | |
57 | * the DRI2 implementation wants to have at least allocate/mmap be generic. | |
58 | * | |
59 | * The goal was to have swap-backed object allocation managed through | |
60 | * struct file. However, file descriptors as handles to a struct file have | |
61 | * two major failings: | |
62 | * - Process limits prevent more than 1024 or so being used at a time by | |
63 | * default. | |
64 | * - Inability to allocate high fds will aggravate the X Server's select() | |
65 | * handling, and likely that of many GL client applications as well. | |
66 | * | |
67 | * This led to a plan of using our own integer IDs (called handles, following | |
68 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as | |
69 | * ioctls. The objects themselves will still include the struct file so | |
70 | * that we can transition to fds if the required kernel infrastructure shows | |
71 | * up at a later date, and as our interface with shmfs for memory allocation. | |
72 | */ | |
73 | ||
a2c0a97b JB |
74 | /* |
75 | * We make up offsets for buffer objects so we can recognize them at | |
76 | * mmap time. | |
77 | */ | |
05269a3a JC |
78 | |
79 | /* pgoff in mmap is an unsigned long, so we need to make sure that | |
80 | * the faked up offset will fit | |
81 | */ | |
82 | ||
83 | #if BITS_PER_LONG == 64 | |
a2c0a97b JB |
84 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
85 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
05269a3a JC |
86 | #else |
87 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) | |
88 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) | |
89 | #endif | |
a2c0a97b | 90 | |
673a394b | 91 | /** |
89d61fc0 DV |
92 | * drm_gem_init - Initialize the GEM device fields |
93 | * @dev: drm_devic structure to initialize | |
673a394b | 94 | */ |
673a394b EA |
95 | int |
96 | drm_gem_init(struct drm_device *dev) | |
97 | { | |
b04a5906 | 98 | struct drm_vma_offset_manager *vma_offset_manager; |
a2c0a97b | 99 | |
cd4f013f | 100 | mutex_init(&dev->object_name_lock); |
e86584c5 | 101 | idr_init_base(&dev->object_name_idr, 1); |
a2c0a97b | 102 | |
b04a5906 DV |
103 | vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL); |
104 | if (!vma_offset_manager) { | |
a2c0a97b JB |
105 | DRM_ERROR("out of memory\n"); |
106 | return -ENOMEM; | |
107 | } | |
108 | ||
b04a5906 DV |
109 | dev->vma_offset_manager = vma_offset_manager; |
110 | drm_vma_offset_manager_init(vma_offset_manager, | |
0de23977 DH |
111 | 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 | { | |
a2c0a97b | 120 | |
b04a5906 DV |
121 | drm_vma_offset_manager_destroy(dev->vma_offset_manager); |
122 | kfree(dev->vma_offset_manager); | |
123 | dev->vma_offset_manager = NULL; | |
a2c0a97b JB |
124 | } |
125 | ||
1d397043 | 126 | /** |
89d61fc0 DV |
127 | * drm_gem_object_init - initialize an allocated shmem-backed GEM object |
128 | * @dev: drm_device the object should be initialized for | |
129 | * @obj: drm_gem_object to initialize | |
130 | * @size: object size | |
131 | * | |
62cb7011 | 132 | * Initialize an already allocated GEM object of the specified size with |
1d397043 DV |
133 | * shmfs backing store. |
134 | */ | |
135 | int drm_gem_object_init(struct drm_device *dev, | |
136 | struct drm_gem_object *obj, size_t size) | |
137 | { | |
89c8233f | 138 | struct file *filp; |
1d397043 | 139 | |
6ab11a26 DV |
140 | drm_gem_private_object_init(dev, obj, size); |
141 | ||
89c8233f DH |
142 | filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); |
143 | if (IS_ERR(filp)) | |
144 | return PTR_ERR(filp); | |
1d397043 | 145 | |
89c8233f | 146 | obj->filp = filp; |
1d397043 | 147 | |
1d397043 DV |
148 | return 0; |
149 | } | |
150 | EXPORT_SYMBOL(drm_gem_object_init); | |
151 | ||
62cb7011 | 152 | /** |
2a5706a3 | 153 | * drm_gem_private_object_init - initialize an allocated private GEM object |
89d61fc0 DV |
154 | * @dev: drm_device the object should be initialized for |
155 | * @obj: drm_gem_object to initialize | |
156 | * @size: object size | |
157 | * | |
62cb7011 AC |
158 | * Initialize an already allocated GEM object of the specified size with |
159 | * no GEM provided backing store. Instead the caller is responsible for | |
160 | * backing the object and handling it. | |
161 | */ | |
89c8233f DH |
162 | void drm_gem_private_object_init(struct drm_device *dev, |
163 | struct drm_gem_object *obj, size_t size) | |
62cb7011 AC |
164 | { |
165 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
166 | ||
167 | obj->dev = dev; | |
168 | obj->filp = NULL; | |
169 | ||
170 | kref_init(&obj->refcount); | |
a8e11d1c | 171 | obj->handle_count = 0; |
62cb7011 | 172 | obj->size = size; |
88d7ebe5 | 173 | drm_vma_node_reset(&obj->vma_node); |
62cb7011 AC |
174 | } |
175 | EXPORT_SYMBOL(drm_gem_private_object_init); | |
176 | ||
0ff926c7 DA |
177 | static void |
178 | drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) | |
179 | { | |
319c933c DV |
180 | /* |
181 | * Note: obj->dma_buf can't disappear as long as we still hold a | |
182 | * handle reference in obj->handle_count. | |
183 | */ | |
d0b2c533 | 184 | mutex_lock(&filp->prime.lock); |
319c933c | 185 | if (obj->dma_buf) { |
d0b2c533 DV |
186 | drm_prime_remove_buf_handle_locked(&filp->prime, |
187 | obj->dma_buf); | |
0ff926c7 | 188 | } |
d0b2c533 | 189 | mutex_unlock(&filp->prime.lock); |
0ff926c7 DA |
190 | } |
191 | ||
36da5908 | 192 | /** |
c6a84325 | 193 | * drm_gem_object_handle_free - release resources bound to userspace handles |
89d61fc0 DV |
194 | * @obj: GEM object to clean up. |
195 | * | |
36da5908 DV |
196 | * Called after the last handle to the object has been closed |
197 | * | |
198 | * Removes any name for the object. Note that this must be | |
199 | * called before drm_gem_object_free or we'll be touching | |
200 | * freed memory | |
201 | */ | |
202 | static void drm_gem_object_handle_free(struct drm_gem_object *obj) | |
203 | { | |
204 | struct drm_device *dev = obj->dev; | |
205 | ||
206 | /* Remove any name for this object */ | |
36da5908 DV |
207 | if (obj->name) { |
208 | idr_remove(&dev->object_name_idr, obj->name); | |
209 | obj->name = 0; | |
a8e11d1c | 210 | } |
36da5908 DV |
211 | } |
212 | ||
319c933c DV |
213 | static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) |
214 | { | |
215 | /* Unbreak the reference cycle if we have an exported dma_buf. */ | |
216 | if (obj->dma_buf) { | |
217 | dma_buf_put(obj->dma_buf); | |
218 | obj->dma_buf = NULL; | |
219 | } | |
220 | } | |
221 | ||
becee2a5 | 222 | static void |
e6b62714 | 223 | drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj) |
36da5908 | 224 | { |
98a8883a CW |
225 | struct drm_device *dev = obj->dev; |
226 | bool final = false; | |
227 | ||
a8e11d1c | 228 | if (WARN_ON(obj->handle_count == 0)) |
36da5908 DV |
229 | return; |
230 | ||
231 | /* | |
232 | * Must bump handle count first as this may be the last | |
233 | * ref, in which case the object would disappear before we | |
234 | * checked for a name | |
235 | */ | |
236 | ||
98a8883a | 237 | mutex_lock(&dev->object_name_lock); |
319c933c | 238 | if (--obj->handle_count == 0) { |
36da5908 | 239 | drm_gem_object_handle_free(obj); |
319c933c | 240 | drm_gem_object_exported_dma_buf_free(obj); |
98a8883a | 241 | final = true; |
319c933c | 242 | } |
98a8883a | 243 | mutex_unlock(&dev->object_name_lock); |
a8e11d1c | 244 | |
98a8883a | 245 | if (final) |
e6b62714 | 246 | drm_gem_object_put_unlocked(obj); |
36da5908 DV |
247 | } |
248 | ||
8815b23a CW |
249 | /* |
250 | * Called at device or object close to release the file's | |
251 | * handle references on objects. | |
252 | */ | |
253 | static int | |
254 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
255 | { | |
256 | struct drm_file *file_priv = data; | |
257 | struct drm_gem_object *obj = ptr; | |
258 | struct drm_device *dev = obj->dev; | |
259 | ||
d0a133f7 CW |
260 | if (dev->driver->gem_close_object) |
261 | dev->driver->gem_close_object(obj, file_priv); | |
262 | ||
8815b23a CW |
263 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
264 | drm_gem_remove_prime_handles(obj, file_priv); | |
d9a1f0b4 | 265 | drm_vma_node_revoke(&obj->vma_node, file_priv); |
8815b23a | 266 | |
e6b62714 | 267 | drm_gem_object_handle_put_unlocked(obj); |
8815b23a CW |
268 | |
269 | return 0; | |
270 | } | |
271 | ||
673a394b | 272 | /** |
89d61fc0 DV |
273 | * drm_gem_handle_delete - deletes the given file-private handle |
274 | * @filp: drm file-private structure to use for the handle look up | |
275 | * @handle: userspace handle to delete | |
276 | * | |
df2e0900 DV |
277 | * Removes the GEM handle from the @filp lookup table which has been added with |
278 | * drm_gem_handle_create(). If this is the last handle also cleans up linked | |
279 | * resources like GEM names. | |
673a394b | 280 | */ |
ff72145b | 281 | int |
a1a2d1d3 | 282 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b | 283 | { |
673a394b EA |
284 | struct drm_gem_object *obj; |
285 | ||
673a394b EA |
286 | spin_lock(&filp->table_lock); |
287 | ||
288 | /* Check if we currently have a reference on the object */ | |
f6cd7dae CW |
289 | obj = idr_replace(&filp->object_idr, NULL, handle); |
290 | spin_unlock(&filp->table_lock); | |
291 | if (IS_ERR_OR_NULL(obj)) | |
673a394b | 292 | return -EINVAL; |
673a394b | 293 | |
f6cd7dae CW |
294 | /* Release driver's reference and decrement refcount. */ |
295 | drm_gem_object_release_handle(handle, obj, filp); | |
296 | ||
297 | /* And finally make the handle available for future allocations. */ | |
298 | spin_lock(&filp->table_lock); | |
673a394b EA |
299 | idr_remove(&filp->object_idr, handle); |
300 | spin_unlock(&filp->table_lock); | |
301 | ||
673a394b EA |
302 | return 0; |
303 | } | |
ff72145b | 304 | EXPORT_SYMBOL(drm_gem_handle_delete); |
673a394b | 305 | |
db611527 NT |
306 | /** |
307 | * drm_gem_dumb_map_offset - return the fake mmap offset for a gem object | |
308 | * @file: drm file-private structure containing the gem object | |
309 | * @dev: corresponding drm_device | |
310 | * @handle: gem object handle | |
311 | * @offset: return location for the fake mmap offset | |
312 | * | |
313 | * This implements the &drm_driver.dumb_map_offset kms driver callback for | |
314 | * drivers which use gem to manage their backing storage. | |
315 | * | |
316 | * Returns: | |
317 | * 0 on success or a negative error code on failure. | |
318 | */ | |
319 | int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, | |
320 | u32 handle, u64 *offset) | |
321 | { | |
322 | struct drm_gem_object *obj; | |
323 | int ret; | |
324 | ||
325 | obj = drm_gem_object_lookup(file, handle); | |
326 | if (!obj) | |
327 | return -ENOENT; | |
328 | ||
90378e58 NT |
329 | /* Don't allow imported objects to be mapped */ |
330 | if (obj->import_attach) { | |
331 | ret = -EINVAL; | |
332 | goto out; | |
333 | } | |
334 | ||
db611527 NT |
335 | ret = drm_gem_create_mmap_offset(obj); |
336 | if (ret) | |
337 | goto out; | |
338 | ||
339 | *offset = drm_vma_node_offset_addr(&obj->vma_node); | |
340 | out: | |
341 | drm_gem_object_put_unlocked(obj); | |
342 | ||
343 | return ret; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset); | |
346 | ||
43387b37 DV |
347 | /** |
348 | * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers | |
89d61fc0 DV |
349 | * @file: drm file-private structure to remove the dumb handle from |
350 | * @dev: corresponding drm_device | |
351 | * @handle: the dumb handle to remove | |
1dd3a060 | 352 | * |
940eba2d DV |
353 | * This implements the &drm_driver.dumb_destroy kms driver callback for drivers |
354 | * which use gem to manage their backing storage. | |
43387b37 DV |
355 | */ |
356 | int drm_gem_dumb_destroy(struct drm_file *file, | |
357 | struct drm_device *dev, | |
358 | uint32_t handle) | |
359 | { | |
360 | return drm_gem_handle_delete(file, handle); | |
361 | } | |
362 | EXPORT_SYMBOL(drm_gem_dumb_destroy); | |
363 | ||
673a394b | 364 | /** |
20228c44 | 365 | * drm_gem_handle_create_tail - internal functions to create a handle |
89d61fc0 DV |
366 | * @file_priv: drm file-private structure to register the handle for |
367 | * @obj: object to register | |
8bf8180f | 368 | * @handlep: pointer to return the created handle to the caller |
1dd3a060 | 369 | * |
940eba2d DV |
370 | * This expects the &drm_device.object_name_lock to be held already and will |
371 | * drop it before returning. Used to avoid races in establishing new handles | |
372 | * when importing an object from either an flink name or a dma-buf. | |
df2e0900 DV |
373 | * |
374 | * Handles must be release again through drm_gem_handle_delete(). This is done | |
375 | * when userspace closes @file_priv for all attached handles, or through the | |
376 | * GEM_CLOSE ioctl for individual handles. | |
673a394b EA |
377 | */ |
378 | int | |
20228c44 DV |
379 | drm_gem_handle_create_tail(struct drm_file *file_priv, |
380 | struct drm_gem_object *obj, | |
381 | u32 *handlep) | |
673a394b | 382 | { |
304eda32 | 383 | struct drm_device *dev = obj->dev; |
9649399e | 384 | u32 handle; |
304eda32 | 385 | int ret; |
673a394b | 386 | |
20228c44 | 387 | WARN_ON(!mutex_is_locked(&dev->object_name_lock)); |
98a8883a | 388 | if (obj->handle_count++ == 0) |
e6b62714 | 389 | drm_gem_object_get(obj); |
20228c44 | 390 | |
673a394b | 391 | /* |
2e928815 TH |
392 | * Get the user-visible handle using idr. Preload and perform |
393 | * allocation under our spinlock. | |
673a394b | 394 | */ |
2e928815 | 395 | idr_preload(GFP_KERNEL); |
673a394b | 396 | spin_lock(&file_priv->table_lock); |
2e928815 TH |
397 | |
398 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); | |
98a8883a | 399 | |
673a394b | 400 | spin_unlock(&file_priv->table_lock); |
2e928815 | 401 | idr_preload_end(); |
98a8883a | 402 | |
cd4f013f | 403 | mutex_unlock(&dev->object_name_lock); |
6984128d CW |
404 | if (ret < 0) |
405 | goto err_unref; | |
406 | ||
9649399e | 407 | handle = ret; |
673a394b | 408 | |
d9a1f0b4 | 409 | ret = drm_vma_node_allow(&obj->vma_node, file_priv); |
6984128d CW |
410 | if (ret) |
411 | goto err_remove; | |
304eda32 BS |
412 | |
413 | if (dev->driver->gem_open_object) { | |
414 | ret = dev->driver->gem_open_object(obj, file_priv); | |
6984128d CW |
415 | if (ret) |
416 | goto err_revoke; | |
304eda32 BS |
417 | } |
418 | ||
9649399e | 419 | *handlep = handle; |
673a394b | 420 | return 0; |
6984128d CW |
421 | |
422 | err_revoke: | |
d9a1f0b4 | 423 | drm_vma_node_revoke(&obj->vma_node, file_priv); |
6984128d CW |
424 | err_remove: |
425 | spin_lock(&file_priv->table_lock); | |
9649399e | 426 | idr_remove(&file_priv->object_idr, handle); |
6984128d CW |
427 | spin_unlock(&file_priv->table_lock); |
428 | err_unref: | |
e6b62714 | 429 | drm_gem_object_handle_put_unlocked(obj); |
6984128d | 430 | return ret; |
673a394b | 431 | } |
20228c44 DV |
432 | |
433 | /** | |
8bf8180f | 434 | * drm_gem_handle_create - create a gem handle for an object |
89d61fc0 DV |
435 | * @file_priv: drm file-private structure to register the handle for |
436 | * @obj: object to register | |
437 | * @handlep: pionter to return the created handle to the caller | |
438 | * | |
39031176 DV |
439 | * Create a handle for this object. This adds a handle reference to the object, |
440 | * which includes a regular reference count. Callers will likely want to | |
441 | * dereference the object afterwards. | |
442 | * | |
443 | * Since this publishes @obj to userspace it must be fully set up by this point, | |
444 | * drivers must call this last in their buffer object creation callbacks. | |
20228c44 | 445 | */ |
8bf8180f TR |
446 | int drm_gem_handle_create(struct drm_file *file_priv, |
447 | struct drm_gem_object *obj, | |
448 | u32 *handlep) | |
20228c44 DV |
449 | { |
450 | mutex_lock(&obj->dev->object_name_lock); | |
451 | ||
452 | return drm_gem_handle_create_tail(file_priv, obj, handlep); | |
453 | } | |
673a394b EA |
454 | EXPORT_SYMBOL(drm_gem_handle_create); |
455 | ||
75ef8b3b RC |
456 | |
457 | /** | |
458 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object | |
459 | * @obj: obj in question | |
460 | * | |
461 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). | |
f74418a4 DV |
462 | * |
463 | * Note that drm_gem_object_release() already calls this function, so drivers | |
464 | * don't have to take care of releasing the mmap offset themselves when freeing | |
465 | * the GEM object. | |
75ef8b3b RC |
466 | */ |
467 | void | |
468 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) | |
469 | { | |
470 | struct drm_device *dev = obj->dev; | |
75ef8b3b | 471 | |
b04a5906 | 472 | drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node); |
75ef8b3b RC |
473 | } |
474 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); | |
475 | ||
476 | /** | |
367bbd49 | 477 | * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object |
75ef8b3b | 478 | * @obj: obj in question |
367bbd49 | 479 | * @size: the virtual size |
75ef8b3b RC |
480 | * |
481 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
482 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
483 | * up the object based on the offset and sets up the various memory mapping | |
484 | * structures. | |
485 | * | |
367bbd49 | 486 | * This routine allocates and attaches a fake offset for @obj, in cases where |
940eba2d DV |
487 | * the virtual size differs from the physical size (ie. &drm_gem_object.size). |
488 | * Otherwise just use drm_gem_create_mmap_offset(). | |
f74418a4 DV |
489 | * |
490 | * This function is idempotent and handles an already allocated mmap offset | |
491 | * transparently. Drivers do not need to check for this case. | |
75ef8b3b RC |
492 | */ |
493 | int | |
367bbd49 | 494 | drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) |
75ef8b3b RC |
495 | { |
496 | struct drm_device *dev = obj->dev; | |
75ef8b3b | 497 | |
b04a5906 | 498 | return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node, |
367bbd49 RC |
499 | size / PAGE_SIZE); |
500 | } | |
501 | EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); | |
502 | ||
503 | /** | |
504 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object | |
505 | * @obj: obj in question | |
506 | * | |
507 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
508 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
509 | * up the object based on the offset and sets up the various memory mapping | |
510 | * structures. | |
511 | * | |
512 | * This routine allocates and attaches a fake offset for @obj. | |
f74418a4 DV |
513 | * |
514 | * Drivers can call drm_gem_free_mmap_offset() before freeing @obj to release | |
515 | * the fake offset again. | |
367bbd49 RC |
516 | */ |
517 | int drm_gem_create_mmap_offset(struct drm_gem_object *obj) | |
518 | { | |
519 | return drm_gem_create_mmap_offset_size(obj, obj->size); | |
75ef8b3b RC |
520 | } |
521 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); | |
522 | ||
bcc5c9d5 RC |
523 | /** |
524 | * drm_gem_get_pages - helper to allocate backing pages for a GEM object | |
525 | * from shmem | |
526 | * @obj: obj in question | |
0cdbe8ac DH |
527 | * |
528 | * This reads the page-array of the shmem-backing storage of the given gem | |
529 | * object. An array of pages is returned. If a page is not allocated or | |
530 | * swapped-out, this will allocate/swap-in the required pages. Note that the | |
531 | * whole object is covered by the page-array and pinned in memory. | |
532 | * | |
533 | * Use drm_gem_put_pages() to release the array and unpin all pages. | |
534 | * | |
535 | * This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()). | |
536 | * If you require other GFP-masks, you have to do those allocations yourself. | |
537 | * | |
538 | * Note that you are not allowed to change gfp-zones during runtime. That is, | |
539 | * shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as | |
540 | * set during initialization. If you have special zone constraints, set them | |
5b9fbfff | 541 | * after drm_gem_object_init() via mapping_set_gfp_mask(). shmem-core takes care |
0cdbe8ac | 542 | * to keep pages in the required zone during swap-in. |
bcc5c9d5 | 543 | */ |
0cdbe8ac | 544 | struct page **drm_gem_get_pages(struct drm_gem_object *obj) |
bcc5c9d5 | 545 | { |
bcc5c9d5 RC |
546 | struct address_space *mapping; |
547 | struct page *p, **pages; | |
548 | int i, npages; | |
549 | ||
550 | /* This is the shared memory object that backs the GEM resource */ | |
93c76a3d | 551 | mapping = obj->filp->f_mapping; |
bcc5c9d5 RC |
552 | |
553 | /* We already BUG_ON() for non-page-aligned sizes in | |
554 | * drm_gem_object_init(), so we should never hit this unless | |
555 | * driver author is doing something really wrong: | |
556 | */ | |
557 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
558 | ||
559 | npages = obj->size >> PAGE_SHIFT; | |
560 | ||
2098105e | 561 | pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); |
bcc5c9d5 RC |
562 | if (pages == NULL) |
563 | return ERR_PTR(-ENOMEM); | |
564 | ||
bcc5c9d5 | 565 | for (i = 0; i < npages; i++) { |
0cdbe8ac | 566 | p = shmem_read_mapping_page(mapping, i); |
bcc5c9d5 RC |
567 | if (IS_ERR(p)) |
568 | goto fail; | |
569 | pages[i] = p; | |
570 | ||
2123000b DH |
571 | /* Make sure shmem keeps __GFP_DMA32 allocated pages in the |
572 | * correct region during swapin. Note that this requires | |
573 | * __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping) | |
574 | * so shmem can relocate pages during swapin if required. | |
bcc5c9d5 | 575 | */ |
c62d2555 | 576 | BUG_ON(mapping_gfp_constraint(mapping, __GFP_DMA32) && |
bcc5c9d5 RC |
577 | (page_to_pfn(p) >= 0x00100000UL)); |
578 | } | |
579 | ||
580 | return pages; | |
581 | ||
582 | fail: | |
583 | while (i--) | |
09cbfeaf | 584 | put_page(pages[i]); |
bcc5c9d5 | 585 | |
2098105e | 586 | kvfree(pages); |
bcc5c9d5 RC |
587 | return ERR_CAST(p); |
588 | } | |
589 | EXPORT_SYMBOL(drm_gem_get_pages); | |
590 | ||
591 | /** | |
592 | * drm_gem_put_pages - helper to free backing pages for a GEM object | |
593 | * @obj: obj in question | |
594 | * @pages: pages to free | |
595 | * @dirty: if true, pages will be marked as dirty | |
596 | * @accessed: if true, the pages will be marked as accessed | |
597 | */ | |
598 | void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, | |
599 | bool dirty, bool accessed) | |
600 | { | |
601 | int i, npages; | |
602 | ||
603 | /* We already BUG_ON() for non-page-aligned sizes in | |
604 | * drm_gem_object_init(), so we should never hit this unless | |
605 | * driver author is doing something really wrong: | |
606 | */ | |
607 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
608 | ||
609 | npages = obj->size >> PAGE_SHIFT; | |
610 | ||
611 | for (i = 0; i < npages; i++) { | |
612 | if (dirty) | |
613 | set_page_dirty(pages[i]); | |
614 | ||
615 | if (accessed) | |
616 | mark_page_accessed(pages[i]); | |
617 | ||
618 | /* Undo the reference we took when populating the table */ | |
09cbfeaf | 619 | put_page(pages[i]); |
bcc5c9d5 RC |
620 | } |
621 | ||
2098105e | 622 | kvfree(pages); |
bcc5c9d5 RC |
623 | } |
624 | EXPORT_SYMBOL(drm_gem_put_pages); | |
625 | ||
df2e0900 DV |
626 | /** |
627 | * drm_gem_object_lookup - look up a GEM object from it's handle | |
df2e0900 DV |
628 | * @filp: DRM file private date |
629 | * @handle: userspace handle | |
630 | * | |
631 | * Returns: | |
632 | * | |
633 | * A reference to the object named by the handle if such exists on @filp, NULL | |
634 | * otherwise. | |
635 | */ | |
673a394b | 636 | struct drm_gem_object * |
a8ad0bd8 | 637 | drm_gem_object_lookup(struct drm_file *filp, u32 handle) |
673a394b EA |
638 | { |
639 | struct drm_gem_object *obj; | |
640 | ||
641 | spin_lock(&filp->table_lock); | |
642 | ||
643 | /* Check if we currently have a reference on the object */ | |
644 | obj = idr_find(&filp->object_idr, handle); | |
a8ad0bd8 | 645 | if (obj) |
e6b62714 | 646 | drm_gem_object_get(obj); |
673a394b EA |
647 | |
648 | spin_unlock(&filp->table_lock); | |
649 | ||
650 | return obj; | |
651 | } | |
652 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
653 | ||
654 | /** | |
89d61fc0 DV |
655 | * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl |
656 | * @dev: drm_device | |
657 | * @data: ioctl data | |
658 | * @file_priv: drm file-private structure | |
659 | * | |
673a394b EA |
660 | * Releases the handle to an mm object. |
661 | */ | |
662 | int | |
663 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
664 | struct drm_file *file_priv) | |
665 | { | |
666 | struct drm_gem_close *args = data; | |
667 | int ret; | |
668 | ||
1bcecfac | 669 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
69fdf420 | 670 | return -EOPNOTSUPP; |
673a394b EA |
671 | |
672 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
673 | ||
674 | return ret; | |
675 | } | |
676 | ||
677 | /** | |
89d61fc0 DV |
678 | * drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl |
679 | * @dev: drm_device | |
680 | * @data: ioctl data | |
681 | * @file_priv: drm file-private structure | |
682 | * | |
673a394b EA |
683 | * Create a global name for an object, returning the name. |
684 | * | |
685 | * Note that the name does not hold a reference; when the object | |
686 | * is freed, the name goes away. | |
687 | */ | |
688 | int | |
689 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
690 | struct drm_file *file_priv) | |
691 | { | |
692 | struct drm_gem_flink *args = data; | |
693 | struct drm_gem_object *obj; | |
694 | int ret; | |
695 | ||
1bcecfac | 696 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
69fdf420 | 697 | return -EOPNOTSUPP; |
673a394b | 698 | |
a8ad0bd8 | 699 | obj = drm_gem_object_lookup(file_priv, args->handle); |
673a394b | 700 | if (obj == NULL) |
bf79cb91 | 701 | return -ENOENT; |
673a394b | 702 | |
cd4f013f | 703 | mutex_lock(&dev->object_name_lock); |
a8e11d1c DV |
704 | /* prevent races with concurrent gem_close. */ |
705 | if (obj->handle_count == 0) { | |
706 | ret = -ENOENT; | |
707 | goto err; | |
708 | } | |
709 | ||
8d59bae5 | 710 | if (!obj->name) { |
0f646425 | 711 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_KERNEL); |
2e928815 | 712 | if (ret < 0) |
8d59bae5 | 713 | goto err; |
2e07fb22 YC |
714 | |
715 | obj->name = ret; | |
8d59bae5 | 716 | } |
3e49c4f4 | 717 | |
2e07fb22 YC |
718 | args->name = (uint64_t) obj->name; |
719 | ret = 0; | |
720 | ||
3e49c4f4 | 721 | err: |
cd4f013f | 722 | mutex_unlock(&dev->object_name_lock); |
e6b62714 | 723 | drm_gem_object_put_unlocked(obj); |
3e49c4f4 | 724 | return ret; |
673a394b EA |
725 | } |
726 | ||
727 | /** | |
89d61fc0 DV |
728 | * drm_gem_open - implementation of the GEM_OPEN ioctl |
729 | * @dev: drm_device | |
730 | * @data: ioctl data | |
731 | * @file_priv: drm file-private structure | |
732 | * | |
673a394b EA |
733 | * Open an object using the global name, returning a handle and the size. |
734 | * | |
735 | * This handle (of course) holds a reference to the object, so the object | |
736 | * will not go away until the handle is deleted. | |
737 | */ | |
738 | int | |
739 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
740 | struct drm_file *file_priv) | |
741 | { | |
742 | struct drm_gem_open *args = data; | |
743 | struct drm_gem_object *obj; | |
744 | int ret; | |
a1a2d1d3 | 745 | u32 handle; |
673a394b | 746 | |
1bcecfac | 747 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
69fdf420 | 748 | return -EOPNOTSUPP; |
673a394b | 749 | |
cd4f013f | 750 | mutex_lock(&dev->object_name_lock); |
673a394b | 751 | obj = idr_find(&dev->object_name_idr, (int) args->name); |
20228c44 | 752 | if (obj) { |
e6b62714 | 753 | drm_gem_object_get(obj); |
20228c44 DV |
754 | } else { |
755 | mutex_unlock(&dev->object_name_lock); | |
673a394b | 756 | return -ENOENT; |
20228c44 | 757 | } |
673a394b | 758 | |
20228c44 DV |
759 | /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */ |
760 | ret = drm_gem_handle_create_tail(file_priv, obj, &handle); | |
e6b62714 | 761 | drm_gem_object_put_unlocked(obj); |
673a394b EA |
762 | if (ret) |
763 | return ret; | |
764 | ||
765 | args->handle = handle; | |
766 | args->size = obj->size; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | /** | |
89d61fc0 DV |
772 | * gem_gem_open - initalizes GEM file-private structures at devnode open time |
773 | * @dev: drm_device which is being opened by userspace | |
774 | * @file_private: drm file-private structure to set up | |
775 | * | |
673a394b EA |
776 | * Called at device open time, sets up the structure for handling refcounting |
777 | * of mm objects. | |
778 | */ | |
779 | void | |
780 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
781 | { | |
e86584c5 | 782 | idr_init_base(&file_private->object_idr, 1); |
673a394b EA |
783 | spin_lock_init(&file_private->table_lock); |
784 | } | |
785 | ||
673a394b | 786 | /** |
89d61fc0 DV |
787 | * drm_gem_release - release file-private GEM resources |
788 | * @dev: drm_device which is being closed by userspace | |
789 | * @file_private: drm file-private structure to clean up | |
790 | * | |
673a394b EA |
791 | * Called at close time when the filp is going away. |
792 | * | |
793 | * Releases any remaining references on objects by this filp. | |
794 | */ | |
795 | void | |
796 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
797 | { | |
673a394b | 798 | idr_for_each(&file_private->object_idr, |
304eda32 | 799 | &drm_gem_object_release_handle, file_private); |
673a394b | 800 | idr_destroy(&file_private->object_idr); |
673a394b EA |
801 | } |
802 | ||
f74418a4 DV |
803 | /** |
804 | * drm_gem_object_release - release GEM buffer object resources | |
805 | * @obj: GEM buffer object | |
806 | * | |
807 | * This releases any structures and resources used by @obj and is the invers of | |
808 | * drm_gem_object_init(). | |
809 | */ | |
fd632aa3 DV |
810 | void |
811 | drm_gem_object_release(struct drm_gem_object *obj) | |
c3ae90c0 | 812 | { |
319c933c DV |
813 | WARN_ON(obj->dma_buf); |
814 | ||
62cb7011 | 815 | if (obj->filp) |
16d2831d | 816 | fput(obj->filp); |
77472347 DH |
817 | |
818 | drm_gem_free_mmap_offset(obj); | |
c3ae90c0 | 819 | } |
fd632aa3 | 820 | EXPORT_SYMBOL(drm_gem_object_release); |
c3ae90c0 | 821 | |
673a394b | 822 | /** |
89d61fc0 DV |
823 | * drm_gem_object_free - free a GEM object |
824 | * @kref: kref of the object to free | |
825 | * | |
673a394b | 826 | * Called after the last reference to the object has been lost. |
940eba2d | 827 | * Must be called holding &drm_device.struct_mutex. |
673a394b EA |
828 | * |
829 | * Frees the object | |
830 | */ | |
831 | void | |
832 | drm_gem_object_free(struct kref *kref) | |
833 | { | |
6ff774bd DV |
834 | struct drm_gem_object *obj = |
835 | container_of(kref, struct drm_gem_object, refcount); | |
673a394b EA |
836 | struct drm_device *dev = obj->dev; |
837 | ||
6d3e7fdd | 838 | if (dev->driver->gem_free_object_unlocked) { |
9f0ba539 | 839 | dev->driver->gem_free_object_unlocked(obj); |
6d3e7fdd DV |
840 | } else if (dev->driver->gem_free_object) { |
841 | WARN_ON(!mutex_is_locked(&dev->struct_mutex)); | |
842 | ||
673a394b | 843 | dev->driver->gem_free_object(obj); |
6d3e7fdd | 844 | } |
673a394b EA |
845 | } |
846 | EXPORT_SYMBOL(drm_gem_object_free); | |
847 | ||
9f0ba539 | 848 | /** |
e6b62714 | 849 | * drm_gem_object_put_unlocked - drop a GEM buffer object reference |
9f0ba539 DV |
850 | * @obj: GEM buffer object |
851 | * | |
852 | * This releases a reference to @obj. Callers must not hold the | |
940eba2d | 853 | * &drm_device.struct_mutex lock when calling this function. |
9f0ba539 | 854 | * |
e6b62714 | 855 | * See also __drm_gem_object_put(). |
9f0ba539 DV |
856 | */ |
857 | void | |
e6b62714 | 858 | drm_gem_object_put_unlocked(struct drm_gem_object *obj) |
9f0ba539 DV |
859 | { |
860 | struct drm_device *dev; | |
861 | ||
862 | if (!obj) | |
863 | return; | |
864 | ||
865 | dev = obj->dev; | |
9f0ba539 | 866 | |
3379c04c | 867 | if (dev->driver->gem_free_object_unlocked) { |
9f0ba539 | 868 | kref_put(&obj->refcount, drm_gem_object_free); |
3379c04c DV |
869 | } else { |
870 | might_lock(&dev->struct_mutex); | |
871 | if (kref_put_mutex(&obj->refcount, drm_gem_object_free, | |
9f0ba539 | 872 | &dev->struct_mutex)) |
3379c04c DV |
873 | mutex_unlock(&dev->struct_mutex); |
874 | } | |
9f0ba539 | 875 | } |
e6b62714 | 876 | EXPORT_SYMBOL(drm_gem_object_put_unlocked); |
9f0ba539 DV |
877 | |
878 | /** | |
e6b62714 | 879 | * drm_gem_object_put - release a GEM buffer object reference |
9f0ba539 DV |
880 | * @obj: GEM buffer object |
881 | * | |
940eba2d DV |
882 | * This releases a reference to @obj. Callers must hold the |
883 | * &drm_device.struct_mutex lock when calling this function, even when the | |
884 | * driver doesn't use &drm_device.struct_mutex for anything. | |
9f0ba539 DV |
885 | * |
886 | * For drivers not encumbered with legacy locking use | |
e6b62714 | 887 | * drm_gem_object_put_unlocked() instead. |
9f0ba539 DV |
888 | */ |
889 | void | |
e6b62714 | 890 | drm_gem_object_put(struct drm_gem_object *obj) |
9f0ba539 DV |
891 | { |
892 | if (obj) { | |
893 | WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); | |
894 | ||
895 | kref_put(&obj->refcount, drm_gem_object_free); | |
896 | } | |
897 | } | |
e6b62714 | 898 | EXPORT_SYMBOL(drm_gem_object_put); |
9f0ba539 | 899 | |
df2e0900 DV |
900 | /** |
901 | * drm_gem_vm_open - vma->ops->open implementation for GEM | |
902 | * @vma: VM area structure | |
903 | * | |
904 | * This function implements the #vm_operations_struct open() callback for GEM | |
905 | * drivers. This must be used together with drm_gem_vm_close(). | |
906 | */ | |
ab00b3e5 JB |
907 | void drm_gem_vm_open(struct vm_area_struct *vma) |
908 | { | |
909 | struct drm_gem_object *obj = vma->vm_private_data; | |
910 | ||
e6b62714 | 911 | drm_gem_object_get(obj); |
ab00b3e5 JB |
912 | } |
913 | EXPORT_SYMBOL(drm_gem_vm_open); | |
914 | ||
df2e0900 DV |
915 | /** |
916 | * drm_gem_vm_close - vma->ops->close implementation for GEM | |
917 | * @vma: VM area structure | |
918 | * | |
919 | * This function implements the #vm_operations_struct close() callback for GEM | |
920 | * drivers. This must be used together with drm_gem_vm_open(). | |
921 | */ | |
ab00b3e5 JB |
922 | void drm_gem_vm_close(struct vm_area_struct *vma) |
923 | { | |
924 | struct drm_gem_object *obj = vma->vm_private_data; | |
ab00b3e5 | 925 | |
e6b62714 | 926 | drm_gem_object_put_unlocked(obj); |
ab00b3e5 JB |
927 | } |
928 | EXPORT_SYMBOL(drm_gem_vm_close); | |
929 | ||
1c5aafa6 LP |
930 | /** |
931 | * drm_gem_mmap_obj - memory map a GEM object | |
932 | * @obj: the GEM object to map | |
933 | * @obj_size: the object size to be mapped, in bytes | |
934 | * @vma: VMA for the area to be mapped | |
935 | * | |
936 | * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops | |
937 | * provided by the driver. Depending on their requirements, drivers can either | |
938 | * provide a fault handler in their gem_vm_ops (in which case any accesses to | |
939 | * the object will be trapped, to perform migration, GTT binding, surface | |
940 | * register allocation, or performance monitoring), or mmap the buffer memory | |
941 | * synchronously after calling drm_gem_mmap_obj. | |
942 | * | |
943 | * This function is mainly intended to implement the DMABUF mmap operation, when | |
944 | * the GEM object is not looked up based on its fake offset. To implement the | |
945 | * DRM mmap operation, drivers should use the drm_gem_mmap() function. | |
946 | * | |
ca481c9b DH |
947 | * drm_gem_mmap_obj() assumes the user is granted access to the buffer while |
948 | * drm_gem_mmap() prevents unprivileged users from mapping random objects. So | |
949 | * callers must verify access restrictions before calling this helper. | |
950 | * | |
1c5aafa6 LP |
951 | * Return 0 or success or -EINVAL if the object size is smaller than the VMA |
952 | * size, or if no gem_vm_ops are provided. | |
953 | */ | |
954 | int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, | |
955 | struct vm_area_struct *vma) | |
956 | { | |
957 | struct drm_device *dev = obj->dev; | |
958 | ||
959 | /* Check for valid size. */ | |
960 | if (obj_size < vma->vm_end - vma->vm_start) | |
961 | return -EINVAL; | |
962 | ||
963 | if (!dev->driver->gem_vm_ops) | |
964 | return -EINVAL; | |
965 | ||
966 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; | |
967 | vma->vm_ops = dev->driver->gem_vm_ops; | |
968 | vma->vm_private_data = obj; | |
16d2831d | 969 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
95cf9264 | 970 | vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); |
1c5aafa6 LP |
971 | |
972 | /* Take a ref for this mapping of the object, so that the fault | |
973 | * handler can dereference the mmap offset's pointer to the object. | |
974 | * This reference is cleaned up by the corresponding vm_close | |
975 | * (which should happen whether the vma was created by this call, or | |
976 | * by a vm_open due to mremap or partial unmap or whatever). | |
977 | */ | |
e6b62714 | 978 | drm_gem_object_get(obj); |
1c5aafa6 | 979 | |
1c5aafa6 LP |
980 | return 0; |
981 | } | |
982 | EXPORT_SYMBOL(drm_gem_mmap_obj); | |
ab00b3e5 | 983 | |
a2c0a97b JB |
984 | /** |
985 | * drm_gem_mmap - memory map routine for GEM objects | |
986 | * @filp: DRM file pointer | |
987 | * @vma: VMA for the area to be mapped | |
988 | * | |
989 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
990 | * descriptor will end up here. | |
991 | * | |
1c5aafa6 | 992 | * Look up the GEM object based on the offset passed in (vma->vm_pgoff will |
a2c0a97b | 993 | * contain the fake offset we created when the GTT map ioctl was called on |
1c5aafa6 | 994 | * the object) and map it with a call to drm_gem_mmap_obj(). |
ca481c9b DH |
995 | * |
996 | * If the caller is not granted access to the buffer object, the mmap will fail | |
997 | * with EACCES. Please see the vma manager for more information. | |
a2c0a97b JB |
998 | */ |
999 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
1000 | { | |
1001 | struct drm_file *priv = filp->private_data; | |
1002 | struct drm_device *dev = priv->minor->dev; | |
2225cfe4 | 1003 | struct drm_gem_object *obj = NULL; |
0de23977 | 1004 | struct drm_vma_offset_node *node; |
a8469aa8 | 1005 | int ret; |
a2c0a97b | 1006 | |
c07dcd61 | 1007 | if (drm_dev_is_unplugged(dev)) |
2c07a21d DA |
1008 | return -ENODEV; |
1009 | ||
2225cfe4 DV |
1010 | drm_vma_offset_lock_lookup(dev->vma_offset_manager); |
1011 | node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager, | |
1012 | vma->vm_pgoff, | |
1013 | vma_pages(vma)); | |
1014 | if (likely(node)) { | |
1015 | obj = container_of(node, struct drm_gem_object, vma_node); | |
1016 | /* | |
1017 | * When the object is being freed, after it hits 0-refcnt it | |
1018 | * proceeds to tear down the object. In the process it will | |
1019 | * attempt to remove the VMA offset and so acquire this | |
1020 | * mgr->vm_lock. Therefore if we find an object with a 0-refcnt | |
1021 | * that matches our range, we know it is in the process of being | |
1022 | * destroyed and will be freed as soon as we release the lock - | |
1023 | * so we have to check for the 0-refcnted object and treat it as | |
1024 | * invalid. | |
1025 | */ | |
1026 | if (!kref_get_unless_zero(&obj->refcount)) | |
1027 | obj = NULL; | |
1028 | } | |
1029 | drm_vma_offset_unlock_lookup(dev->vma_offset_manager); | |
a2c0a97b | 1030 | |
2225cfe4 | 1031 | if (!obj) |
197633b9 | 1032 | return -EINVAL; |
2225cfe4 | 1033 | |
d9a1f0b4 | 1034 | if (!drm_vma_node_is_allowed(node, priv)) { |
e6b62714 | 1035 | drm_gem_object_put_unlocked(obj); |
ca481c9b | 1036 | return -EACCES; |
a2c0a97b JB |
1037 | } |
1038 | ||
3e977ac6 CW |
1039 | if (node->readonly) { |
1040 | if (vma->vm_flags & VM_WRITE) { | |
1041 | drm_gem_object_put_unlocked(obj); | |
1042 | return -EINVAL; | |
1043 | } | |
1044 | ||
1045 | vma->vm_flags &= ~VM_MAYWRITE; | |
1046 | } | |
1047 | ||
2225cfe4 DV |
1048 | ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, |
1049 | vma); | |
a2c0a97b | 1050 | |
e6b62714 | 1051 | drm_gem_object_put_unlocked(obj); |
a2c0a97b JB |
1052 | |
1053 | return ret; | |
1054 | } | |
1055 | EXPORT_SYMBOL(drm_gem_mmap); | |
45d58b40 NT |
1056 | |
1057 | void drm_gem_print_info(struct drm_printer *p, unsigned int indent, | |
1058 | const struct drm_gem_object *obj) | |
1059 | { | |
1060 | drm_printf_indent(p, indent, "name=%d\n", obj->name); | |
1061 | drm_printf_indent(p, indent, "refcount=%u\n", | |
1062 | kref_read(&obj->refcount)); | |
1063 | drm_printf_indent(p, indent, "start=%08lx\n", | |
1064 | drm_vma_node_start(&obj->vma_node)); | |
1065 | drm_printf_indent(p, indent, "size=%zu\n", obj->size); | |
1066 | drm_printf_indent(p, indent, "imported=%s\n", | |
1067 | obj->import_attach ? "yes" : "no"); | |
1068 | ||
1069 | if (obj->dev->driver->gem_print_info) | |
1070 | obj->dev->driver->gem_print_info(p, indent, obj); | |
1071 | } |