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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> |
0de23977 | 40 | #include <drm/drm_vma_manager.h> |
d9fc9413 | 41 | #include <drm/drm_gem.h> |
67d0ec4e | 42 | #include "drm_internal.h" |
673a394b EA |
43 | |
44 | /** @file drm_gem.c | |
45 | * | |
46 | * This file provides some of the base ioctls and library routines for | |
47 | * the graphics memory manager implemented by each device driver. | |
48 | * | |
49 | * Because various devices have different requirements in terms of | |
50 | * synchronization and migration strategies, implementing that is left up to | |
51 | * the driver, and all that the general API provides should be generic -- | |
52 | * allocating objects, reading/writing data with the cpu, freeing objects. | |
53 | * Even there, platform-dependent optimizations for reading/writing data with | |
54 | * the CPU mean we'll likely hook those out to driver-specific calls. However, | |
55 | * the DRI2 implementation wants to have at least allocate/mmap be generic. | |
56 | * | |
57 | * The goal was to have swap-backed object allocation managed through | |
58 | * struct file. However, file descriptors as handles to a struct file have | |
59 | * two major failings: | |
60 | * - Process limits prevent more than 1024 or so being used at a time by | |
61 | * default. | |
62 | * - Inability to allocate high fds will aggravate the X Server's select() | |
63 | * handling, and likely that of many GL client applications as well. | |
64 | * | |
65 | * This led to a plan of using our own integer IDs (called handles, following | |
66 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as | |
67 | * ioctls. The objects themselves will still include the struct file so | |
68 | * that we can transition to fds if the required kernel infrastructure shows | |
69 | * up at a later date, and as our interface with shmfs for memory allocation. | |
70 | */ | |
71 | ||
a2c0a97b JB |
72 | /* |
73 | * We make up offsets for buffer objects so we can recognize them at | |
74 | * mmap time. | |
75 | */ | |
05269a3a JC |
76 | |
77 | /* pgoff in mmap is an unsigned long, so we need to make sure that | |
78 | * the faked up offset will fit | |
79 | */ | |
80 | ||
81 | #if BITS_PER_LONG == 64 | |
a2c0a97b JB |
82 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
83 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
05269a3a JC |
84 | #else |
85 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) | |
86 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) | |
87 | #endif | |
a2c0a97b | 88 | |
673a394b | 89 | /** |
89d61fc0 DV |
90 | * drm_gem_init - Initialize the GEM device fields |
91 | * @dev: drm_devic structure to initialize | |
673a394b | 92 | */ |
673a394b EA |
93 | int |
94 | drm_gem_init(struct drm_device *dev) | |
95 | { | |
b04a5906 | 96 | struct drm_vma_offset_manager *vma_offset_manager; |
a2c0a97b | 97 | |
cd4f013f | 98 | mutex_init(&dev->object_name_lock); |
673a394b | 99 | idr_init(&dev->object_name_idr); |
a2c0a97b | 100 | |
b04a5906 DV |
101 | vma_offset_manager = kzalloc(sizeof(*vma_offset_manager), GFP_KERNEL); |
102 | if (!vma_offset_manager) { | |
a2c0a97b JB |
103 | DRM_ERROR("out of memory\n"); |
104 | return -ENOMEM; | |
105 | } | |
106 | ||
b04a5906 DV |
107 | dev->vma_offset_manager = vma_offset_manager; |
108 | drm_vma_offset_manager_init(vma_offset_manager, | |
0de23977 DH |
109 | DRM_FILE_PAGE_OFFSET_START, |
110 | DRM_FILE_PAGE_OFFSET_SIZE); | |
a2c0a97b | 111 | |
673a394b EA |
112 | return 0; |
113 | } | |
114 | ||
a2c0a97b JB |
115 | void |
116 | drm_gem_destroy(struct drm_device *dev) | |
117 | { | |
a2c0a97b | 118 | |
b04a5906 DV |
119 | drm_vma_offset_manager_destroy(dev->vma_offset_manager); |
120 | kfree(dev->vma_offset_manager); | |
121 | dev->vma_offset_manager = NULL; | |
a2c0a97b JB |
122 | } |
123 | ||
1d397043 | 124 | /** |
89d61fc0 DV |
125 | * drm_gem_object_init - initialize an allocated shmem-backed GEM object |
126 | * @dev: drm_device the object should be initialized for | |
127 | * @obj: drm_gem_object to initialize | |
128 | * @size: object size | |
129 | * | |
62cb7011 | 130 | * Initialize an already allocated GEM object of the specified size with |
1d397043 DV |
131 | * shmfs backing store. |
132 | */ | |
133 | int drm_gem_object_init(struct drm_device *dev, | |
134 | struct drm_gem_object *obj, size_t size) | |
135 | { | |
89c8233f | 136 | struct file *filp; |
1d397043 | 137 | |
6ab11a26 DV |
138 | drm_gem_private_object_init(dev, obj, size); |
139 | ||
89c8233f DH |
140 | filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); |
141 | if (IS_ERR(filp)) | |
142 | return PTR_ERR(filp); | |
1d397043 | 143 | |
89c8233f | 144 | obj->filp = filp; |
1d397043 | 145 | |
1d397043 DV |
146 | return 0; |
147 | } | |
148 | EXPORT_SYMBOL(drm_gem_object_init); | |
149 | ||
62cb7011 | 150 | /** |
2a5706a3 | 151 | * drm_gem_private_object_init - initialize an allocated private GEM object |
89d61fc0 DV |
152 | * @dev: drm_device the object should be initialized for |
153 | * @obj: drm_gem_object to initialize | |
154 | * @size: object size | |
155 | * | |
62cb7011 AC |
156 | * Initialize an already allocated GEM object of the specified size with |
157 | * no GEM provided backing store. Instead the caller is responsible for | |
158 | * backing the object and handling it. | |
159 | */ | |
89c8233f DH |
160 | void drm_gem_private_object_init(struct drm_device *dev, |
161 | struct drm_gem_object *obj, size_t size) | |
62cb7011 AC |
162 | { |
163 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
164 | ||
165 | obj->dev = dev; | |
166 | obj->filp = NULL; | |
167 | ||
168 | kref_init(&obj->refcount); | |
a8e11d1c | 169 | obj->handle_count = 0; |
62cb7011 | 170 | obj->size = size; |
88d7ebe5 | 171 | drm_vma_node_reset(&obj->vma_node); |
62cb7011 AC |
172 | } |
173 | EXPORT_SYMBOL(drm_gem_private_object_init); | |
174 | ||
0ff926c7 DA |
175 | static void |
176 | drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) | |
177 | { | |
319c933c DV |
178 | /* |
179 | * Note: obj->dma_buf can't disappear as long as we still hold a | |
180 | * handle reference in obj->handle_count. | |
181 | */ | |
d0b2c533 | 182 | mutex_lock(&filp->prime.lock); |
319c933c | 183 | if (obj->dma_buf) { |
d0b2c533 DV |
184 | drm_prime_remove_buf_handle_locked(&filp->prime, |
185 | obj->dma_buf); | |
0ff926c7 | 186 | } |
d0b2c533 | 187 | mutex_unlock(&filp->prime.lock); |
0ff926c7 DA |
188 | } |
189 | ||
36da5908 | 190 | /** |
89d61fc0 DV |
191 | * drm_gem_object_free - release resources bound to userspace handles |
192 | * @obj: GEM object to clean up. | |
193 | * | |
36da5908 DV |
194 | * Called after the last handle to the object has been closed |
195 | * | |
196 | * Removes any name for the object. Note that this must be | |
197 | * called before drm_gem_object_free or we'll be touching | |
198 | * freed memory | |
199 | */ | |
200 | static void drm_gem_object_handle_free(struct drm_gem_object *obj) | |
201 | { | |
202 | struct drm_device *dev = obj->dev; | |
203 | ||
204 | /* Remove any name for this object */ | |
36da5908 DV |
205 | if (obj->name) { |
206 | idr_remove(&dev->object_name_idr, obj->name); | |
207 | obj->name = 0; | |
a8e11d1c | 208 | } |
36da5908 DV |
209 | } |
210 | ||
319c933c DV |
211 | static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) |
212 | { | |
213 | /* Unbreak the reference cycle if we have an exported dma_buf. */ | |
214 | if (obj->dma_buf) { | |
215 | dma_buf_put(obj->dma_buf); | |
216 | obj->dma_buf = NULL; | |
217 | } | |
218 | } | |
219 | ||
becee2a5 | 220 | static void |
36da5908 DV |
221 | drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj) |
222 | { | |
a8e11d1c | 223 | if (WARN_ON(obj->handle_count == 0)) |
36da5908 DV |
224 | return; |
225 | ||
226 | /* | |
227 | * Must bump handle count first as this may be the last | |
228 | * ref, in which case the object would disappear before we | |
229 | * checked for a name | |
230 | */ | |
231 | ||
cd4f013f | 232 | mutex_lock(&obj->dev->object_name_lock); |
319c933c | 233 | if (--obj->handle_count == 0) { |
36da5908 | 234 | drm_gem_object_handle_free(obj); |
319c933c DV |
235 | drm_gem_object_exported_dma_buf_free(obj); |
236 | } | |
cd4f013f | 237 | mutex_unlock(&obj->dev->object_name_lock); |
a8e11d1c | 238 | |
36da5908 DV |
239 | drm_gem_object_unreference_unlocked(obj); |
240 | } | |
241 | ||
673a394b | 242 | /** |
89d61fc0 DV |
243 | * drm_gem_handle_delete - deletes the given file-private handle |
244 | * @filp: drm file-private structure to use for the handle look up | |
245 | * @handle: userspace handle to delete | |
246 | * | |
247 | * Removes the GEM handle from the @filp lookup table and if this is the last | |
248 | * handle also cleans up linked resources like GEM names. | |
673a394b | 249 | */ |
ff72145b | 250 | int |
a1a2d1d3 | 251 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b EA |
252 | { |
253 | struct drm_device *dev; | |
254 | struct drm_gem_object *obj; | |
255 | ||
256 | /* This is gross. The idr system doesn't let us try a delete and | |
257 | * return an error code. It just spews if you fail at deleting. | |
258 | * So, we have to grab a lock around finding the object and then | |
259 | * doing the delete on it and dropping the refcount, or the user | |
260 | * could race us to double-decrement the refcount and cause a | |
261 | * use-after-free later. Given the frequency of our handle lookups, | |
262 | * we may want to use ida for number allocation and a hash table | |
263 | * for the pointers, anyway. | |
264 | */ | |
265 | spin_lock(&filp->table_lock); | |
266 | ||
267 | /* Check if we currently have a reference on the object */ | |
268 | obj = idr_find(&filp->object_idr, handle); | |
269 | if (obj == NULL) { | |
270 | spin_unlock(&filp->table_lock); | |
271 | return -EINVAL; | |
272 | } | |
273 | dev = obj->dev; | |
274 | ||
275 | /* Release reference and decrement refcount. */ | |
276 | idr_remove(&filp->object_idr, handle); | |
277 | spin_unlock(&filp->table_lock); | |
278 | ||
9c784855 TR |
279 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
280 | drm_gem_remove_prime_handles(obj, filp); | |
ca481c9b | 281 | drm_vma_node_revoke(&obj->vma_node, filp->filp); |
3248877e | 282 | |
304eda32 BS |
283 | if (dev->driver->gem_close_object) |
284 | dev->driver->gem_close_object(obj, filp); | |
bc9025bd | 285 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
286 | |
287 | return 0; | |
288 | } | |
ff72145b | 289 | EXPORT_SYMBOL(drm_gem_handle_delete); |
673a394b | 290 | |
43387b37 DV |
291 | /** |
292 | * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers | |
89d61fc0 DV |
293 | * @file: drm file-private structure to remove the dumb handle from |
294 | * @dev: corresponding drm_device | |
295 | * @handle: the dumb handle to remove | |
43387b37 DV |
296 | * |
297 | * This implements the ->dumb_destroy kms driver callback for drivers which use | |
298 | * gem to manage their backing storage. | |
299 | */ | |
300 | int drm_gem_dumb_destroy(struct drm_file *file, | |
301 | struct drm_device *dev, | |
302 | uint32_t handle) | |
303 | { | |
304 | return drm_gem_handle_delete(file, handle); | |
305 | } | |
306 | EXPORT_SYMBOL(drm_gem_dumb_destroy); | |
307 | ||
673a394b | 308 | /** |
20228c44 | 309 | * drm_gem_handle_create_tail - internal functions to create a handle |
89d61fc0 DV |
310 | * @file_priv: drm file-private structure to register the handle for |
311 | * @obj: object to register | |
312 | * @handlep: pionter to return the created handle to the caller | |
20228c44 DV |
313 | * |
314 | * This expects the dev->object_name_lock to be held already and will drop it | |
315 | * before returning. Used to avoid races in establishing new handles when | |
316 | * importing an object from either an flink name or a dma-buf. | |
673a394b EA |
317 | */ |
318 | int | |
20228c44 DV |
319 | drm_gem_handle_create_tail(struct drm_file *file_priv, |
320 | struct drm_gem_object *obj, | |
321 | u32 *handlep) | |
673a394b | 322 | { |
304eda32 BS |
323 | struct drm_device *dev = obj->dev; |
324 | int ret; | |
673a394b | 325 | |
20228c44 DV |
326 | WARN_ON(!mutex_is_locked(&dev->object_name_lock)); |
327 | ||
673a394b | 328 | /* |
2e928815 TH |
329 | * Get the user-visible handle using idr. Preload and perform |
330 | * allocation under our spinlock. | |
673a394b | 331 | */ |
2e928815 | 332 | idr_preload(GFP_KERNEL); |
673a394b | 333 | spin_lock(&file_priv->table_lock); |
2e928815 TH |
334 | |
335 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); | |
a8e11d1c DV |
336 | drm_gem_object_reference(obj); |
337 | obj->handle_count++; | |
673a394b | 338 | spin_unlock(&file_priv->table_lock); |
2e928815 | 339 | idr_preload_end(); |
cd4f013f | 340 | mutex_unlock(&dev->object_name_lock); |
a8e11d1c DV |
341 | if (ret < 0) { |
342 | drm_gem_object_handle_unreference_unlocked(obj); | |
673a394b | 343 | return ret; |
a8e11d1c | 344 | } |
2e928815 | 345 | *handlep = ret; |
673a394b | 346 | |
ca481c9b DH |
347 | ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp); |
348 | if (ret) { | |
349 | drm_gem_handle_delete(file_priv, *handlep); | |
350 | return ret; | |
351 | } | |
304eda32 BS |
352 | |
353 | if (dev->driver->gem_open_object) { | |
354 | ret = dev->driver->gem_open_object(obj, file_priv); | |
355 | if (ret) { | |
356 | drm_gem_handle_delete(file_priv, *handlep); | |
357 | return ret; | |
358 | } | |
359 | } | |
360 | ||
673a394b EA |
361 | return 0; |
362 | } | |
20228c44 DV |
363 | |
364 | /** | |
89d61fc0 DV |
365 | * gem_handle_create - create a gem handle for an object |
366 | * @file_priv: drm file-private structure to register the handle for | |
367 | * @obj: object to register | |
368 | * @handlep: pionter to return the created handle to the caller | |
369 | * | |
20228c44 DV |
370 | * Create a handle for this object. This adds a handle reference |
371 | * to the object, which includes a regular reference count. Callers | |
372 | * will likely want to dereference the object afterwards. | |
373 | */ | |
374 | int | |
375 | drm_gem_handle_create(struct drm_file *file_priv, | |
376 | struct drm_gem_object *obj, | |
377 | u32 *handlep) | |
378 | { | |
379 | mutex_lock(&obj->dev->object_name_lock); | |
380 | ||
381 | return drm_gem_handle_create_tail(file_priv, obj, handlep); | |
382 | } | |
673a394b EA |
383 | EXPORT_SYMBOL(drm_gem_handle_create); |
384 | ||
75ef8b3b RC |
385 | |
386 | /** | |
387 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object | |
388 | * @obj: obj in question | |
389 | * | |
390 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). | |
391 | */ | |
392 | void | |
393 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) | |
394 | { | |
395 | struct drm_device *dev = obj->dev; | |
75ef8b3b | 396 | |
b04a5906 | 397 | drm_vma_offset_remove(dev->vma_offset_manager, &obj->vma_node); |
75ef8b3b RC |
398 | } |
399 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); | |
400 | ||
401 | /** | |
367bbd49 | 402 | * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object |
75ef8b3b | 403 | * @obj: obj in question |
367bbd49 | 404 | * @size: the virtual size |
75ef8b3b RC |
405 | * |
406 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
407 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
408 | * up the object based on the offset and sets up the various memory mapping | |
409 | * structures. | |
410 | * | |
367bbd49 RC |
411 | * This routine allocates and attaches a fake offset for @obj, in cases where |
412 | * the virtual size differs from the physical size (ie. obj->size). Otherwise | |
413 | * just use drm_gem_create_mmap_offset(). | |
75ef8b3b RC |
414 | */ |
415 | int | |
367bbd49 | 416 | drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) |
75ef8b3b RC |
417 | { |
418 | struct drm_device *dev = obj->dev; | |
75ef8b3b | 419 | |
b04a5906 | 420 | return drm_vma_offset_add(dev->vma_offset_manager, &obj->vma_node, |
367bbd49 RC |
421 | size / PAGE_SIZE); |
422 | } | |
423 | EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); | |
424 | ||
425 | /** | |
426 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object | |
427 | * @obj: obj in question | |
428 | * | |
429 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
430 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
431 | * up the object based on the offset and sets up the various memory mapping | |
432 | * structures. | |
433 | * | |
434 | * This routine allocates and attaches a fake offset for @obj. | |
435 | */ | |
436 | int drm_gem_create_mmap_offset(struct drm_gem_object *obj) | |
437 | { | |
438 | return drm_gem_create_mmap_offset_size(obj, obj->size); | |
75ef8b3b RC |
439 | } |
440 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); | |
441 | ||
bcc5c9d5 RC |
442 | /** |
443 | * drm_gem_get_pages - helper to allocate backing pages for a GEM object | |
444 | * from shmem | |
445 | * @obj: obj in question | |
0cdbe8ac DH |
446 | * |
447 | * This reads the page-array of the shmem-backing storage of the given gem | |
448 | * object. An array of pages is returned. If a page is not allocated or | |
449 | * swapped-out, this will allocate/swap-in the required pages. Note that the | |
450 | * whole object is covered by the page-array and pinned in memory. | |
451 | * | |
452 | * Use drm_gem_put_pages() to release the array and unpin all pages. | |
453 | * | |
454 | * This uses the GFP-mask set on the shmem-mapping (see mapping_set_gfp_mask()). | |
455 | * If you require other GFP-masks, you have to do those allocations yourself. | |
456 | * | |
457 | * Note that you are not allowed to change gfp-zones during runtime. That is, | |
458 | * shmem_read_mapping_page_gfp() must be called with the same gfp_zone(gfp) as | |
459 | * set during initialization. If you have special zone constraints, set them | |
460 | * after drm_gem_init_object() via mapping_set_gfp_mask(). shmem-core takes care | |
461 | * to keep pages in the required zone during swap-in. | |
bcc5c9d5 | 462 | */ |
0cdbe8ac | 463 | struct page **drm_gem_get_pages(struct drm_gem_object *obj) |
bcc5c9d5 | 464 | { |
bcc5c9d5 RC |
465 | struct address_space *mapping; |
466 | struct page *p, **pages; | |
467 | int i, npages; | |
468 | ||
469 | /* This is the shared memory object that backs the GEM resource */ | |
0cdbe8ac | 470 | mapping = file_inode(obj->filp)->i_mapping; |
bcc5c9d5 RC |
471 | |
472 | /* We already BUG_ON() for non-page-aligned sizes in | |
473 | * drm_gem_object_init(), so we should never hit this unless | |
474 | * driver author is doing something really wrong: | |
475 | */ | |
476 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
477 | ||
478 | npages = obj->size >> PAGE_SHIFT; | |
479 | ||
480 | pages = drm_malloc_ab(npages, sizeof(struct page *)); | |
481 | if (pages == NULL) | |
482 | return ERR_PTR(-ENOMEM); | |
483 | ||
bcc5c9d5 | 484 | for (i = 0; i < npages; i++) { |
0cdbe8ac | 485 | p = shmem_read_mapping_page(mapping, i); |
bcc5c9d5 RC |
486 | if (IS_ERR(p)) |
487 | goto fail; | |
488 | pages[i] = p; | |
489 | ||
2123000b DH |
490 | /* Make sure shmem keeps __GFP_DMA32 allocated pages in the |
491 | * correct region during swapin. Note that this requires | |
492 | * __GFP_DMA32 to be set in mapping_gfp_mask(inode->i_mapping) | |
493 | * so shmem can relocate pages during swapin if required. | |
bcc5c9d5 | 494 | */ |
0cdbe8ac | 495 | BUG_ON((mapping_gfp_mask(mapping) & __GFP_DMA32) && |
bcc5c9d5 RC |
496 | (page_to_pfn(p) >= 0x00100000UL)); |
497 | } | |
498 | ||
499 | return pages; | |
500 | ||
501 | fail: | |
502 | while (i--) | |
503 | page_cache_release(pages[i]); | |
504 | ||
505 | drm_free_large(pages); | |
506 | return ERR_CAST(p); | |
507 | } | |
508 | EXPORT_SYMBOL(drm_gem_get_pages); | |
509 | ||
510 | /** | |
511 | * drm_gem_put_pages - helper to free backing pages for a GEM object | |
512 | * @obj: obj in question | |
513 | * @pages: pages to free | |
514 | * @dirty: if true, pages will be marked as dirty | |
515 | * @accessed: if true, the pages will be marked as accessed | |
516 | */ | |
517 | void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, | |
518 | bool dirty, bool accessed) | |
519 | { | |
520 | int i, npages; | |
521 | ||
522 | /* We already BUG_ON() for non-page-aligned sizes in | |
523 | * drm_gem_object_init(), so we should never hit this unless | |
524 | * driver author is doing something really wrong: | |
525 | */ | |
526 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
527 | ||
528 | npages = obj->size >> PAGE_SHIFT; | |
529 | ||
530 | for (i = 0; i < npages; i++) { | |
531 | if (dirty) | |
532 | set_page_dirty(pages[i]); | |
533 | ||
534 | if (accessed) | |
535 | mark_page_accessed(pages[i]); | |
536 | ||
537 | /* Undo the reference we took when populating the table */ | |
538 | page_cache_release(pages[i]); | |
539 | } | |
540 | ||
541 | drm_free_large(pages); | |
542 | } | |
543 | EXPORT_SYMBOL(drm_gem_put_pages); | |
544 | ||
673a394b EA |
545 | /** Returns a reference to the object named by the handle. */ |
546 | struct drm_gem_object * | |
547 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, | |
a1a2d1d3 | 548 | u32 handle) |
673a394b EA |
549 | { |
550 | struct drm_gem_object *obj; | |
551 | ||
552 | spin_lock(&filp->table_lock); | |
553 | ||
554 | /* Check if we currently have a reference on the object */ | |
555 | obj = idr_find(&filp->object_idr, handle); | |
556 | if (obj == NULL) { | |
557 | spin_unlock(&filp->table_lock); | |
558 | return NULL; | |
559 | } | |
560 | ||
561 | drm_gem_object_reference(obj); | |
562 | ||
563 | spin_unlock(&filp->table_lock); | |
564 | ||
565 | return obj; | |
566 | } | |
567 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
568 | ||
569 | /** | |
89d61fc0 DV |
570 | * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl |
571 | * @dev: drm_device | |
572 | * @data: ioctl data | |
573 | * @file_priv: drm file-private structure | |
574 | * | |
673a394b EA |
575 | * Releases the handle to an mm object. |
576 | */ | |
577 | int | |
578 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
579 | struct drm_file *file_priv) | |
580 | { | |
581 | struct drm_gem_close *args = data; | |
582 | int ret; | |
583 | ||
1bcecfac | 584 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
585 | return -ENODEV; |
586 | ||
587 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
588 | ||
589 | return ret; | |
590 | } | |
591 | ||
592 | /** | |
89d61fc0 DV |
593 | * drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl |
594 | * @dev: drm_device | |
595 | * @data: ioctl data | |
596 | * @file_priv: drm file-private structure | |
597 | * | |
673a394b EA |
598 | * Create a global name for an object, returning the name. |
599 | * | |
600 | * Note that the name does not hold a reference; when the object | |
601 | * is freed, the name goes away. | |
602 | */ | |
603 | int | |
604 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
605 | struct drm_file *file_priv) | |
606 | { | |
607 | struct drm_gem_flink *args = data; | |
608 | struct drm_gem_object *obj; | |
609 | int ret; | |
610 | ||
1bcecfac | 611 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
612 | return -ENODEV; |
613 | ||
614 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
615 | if (obj == NULL) | |
bf79cb91 | 616 | return -ENOENT; |
673a394b | 617 | |
cd4f013f | 618 | mutex_lock(&dev->object_name_lock); |
2e928815 | 619 | idr_preload(GFP_KERNEL); |
a8e11d1c DV |
620 | /* prevent races with concurrent gem_close. */ |
621 | if (obj->handle_count == 0) { | |
622 | ret = -ENOENT; | |
623 | goto err; | |
624 | } | |
625 | ||
8d59bae5 | 626 | if (!obj->name) { |
2e928815 | 627 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); |
2e928815 | 628 | if (ret < 0) |
8d59bae5 | 629 | goto err; |
2e07fb22 YC |
630 | |
631 | obj->name = ret; | |
8d59bae5 | 632 | } |
3e49c4f4 | 633 | |
2e07fb22 YC |
634 | args->name = (uint64_t) obj->name; |
635 | ret = 0; | |
636 | ||
3e49c4f4 | 637 | err: |
2e07fb22 | 638 | idr_preload_end(); |
cd4f013f | 639 | mutex_unlock(&dev->object_name_lock); |
bc9025bd | 640 | drm_gem_object_unreference_unlocked(obj); |
3e49c4f4 | 641 | return ret; |
673a394b EA |
642 | } |
643 | ||
644 | /** | |
89d61fc0 DV |
645 | * drm_gem_open - implementation of the GEM_OPEN ioctl |
646 | * @dev: drm_device | |
647 | * @data: ioctl data | |
648 | * @file_priv: drm file-private structure | |
649 | * | |
673a394b EA |
650 | * Open an object using the global name, returning a handle and the size. |
651 | * | |
652 | * This handle (of course) holds a reference to the object, so the object | |
653 | * will not go away until the handle is deleted. | |
654 | */ | |
655 | int | |
656 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
657 | struct drm_file *file_priv) | |
658 | { | |
659 | struct drm_gem_open *args = data; | |
660 | struct drm_gem_object *obj; | |
661 | int ret; | |
a1a2d1d3 | 662 | u32 handle; |
673a394b | 663 | |
1bcecfac | 664 | if (!drm_core_check_feature(dev, DRIVER_GEM)) |
673a394b EA |
665 | return -ENODEV; |
666 | ||
cd4f013f | 667 | mutex_lock(&dev->object_name_lock); |
673a394b | 668 | obj = idr_find(&dev->object_name_idr, (int) args->name); |
20228c44 | 669 | if (obj) { |
673a394b | 670 | drm_gem_object_reference(obj); |
20228c44 DV |
671 | } else { |
672 | mutex_unlock(&dev->object_name_lock); | |
673a394b | 673 | return -ENOENT; |
20228c44 | 674 | } |
673a394b | 675 | |
20228c44 DV |
676 | /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */ |
677 | ret = drm_gem_handle_create_tail(file_priv, obj, &handle); | |
bc9025bd | 678 | drm_gem_object_unreference_unlocked(obj); |
673a394b EA |
679 | if (ret) |
680 | return ret; | |
681 | ||
682 | args->handle = handle; | |
683 | args->size = obj->size; | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
688 | /** | |
89d61fc0 DV |
689 | * gem_gem_open - initalizes GEM file-private structures at devnode open time |
690 | * @dev: drm_device which is being opened by userspace | |
691 | * @file_private: drm file-private structure to set up | |
692 | * | |
673a394b EA |
693 | * Called at device open time, sets up the structure for handling refcounting |
694 | * of mm objects. | |
695 | */ | |
696 | void | |
697 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
698 | { | |
699 | idr_init(&file_private->object_idr); | |
700 | spin_lock_init(&file_private->table_lock); | |
701 | } | |
702 | ||
89d61fc0 | 703 | /* |
673a394b EA |
704 | * Called at device close to release the file's |
705 | * handle references on objects. | |
706 | */ | |
707 | static int | |
708 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
709 | { | |
304eda32 | 710 | struct drm_file *file_priv = data; |
673a394b | 711 | struct drm_gem_object *obj = ptr; |
304eda32 BS |
712 | struct drm_device *dev = obj->dev; |
713 | ||
9c784855 TR |
714 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
715 | drm_gem_remove_prime_handles(obj, file_priv); | |
ca481c9b | 716 | drm_vma_node_revoke(&obj->vma_node, file_priv->filp); |
3248877e | 717 | |
304eda32 BS |
718 | if (dev->driver->gem_close_object) |
719 | dev->driver->gem_close_object(obj, file_priv); | |
673a394b | 720 | |
bc9025bd | 721 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
722 | |
723 | return 0; | |
724 | } | |
725 | ||
726 | /** | |
89d61fc0 DV |
727 | * drm_gem_release - release file-private GEM resources |
728 | * @dev: drm_device which is being closed by userspace | |
729 | * @file_private: drm file-private structure to clean up | |
730 | * | |
673a394b EA |
731 | * Called at close time when the filp is going away. |
732 | * | |
733 | * Releases any remaining references on objects by this filp. | |
734 | */ | |
735 | void | |
736 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
737 | { | |
673a394b | 738 | idr_for_each(&file_private->object_idr, |
304eda32 | 739 | &drm_gem_object_release_handle, file_private); |
673a394b | 740 | idr_destroy(&file_private->object_idr); |
673a394b EA |
741 | } |
742 | ||
fd632aa3 DV |
743 | void |
744 | drm_gem_object_release(struct drm_gem_object *obj) | |
c3ae90c0 | 745 | { |
319c933c DV |
746 | WARN_ON(obj->dma_buf); |
747 | ||
62cb7011 | 748 | if (obj->filp) |
16d2831d | 749 | fput(obj->filp); |
77472347 DH |
750 | |
751 | drm_gem_free_mmap_offset(obj); | |
c3ae90c0 | 752 | } |
fd632aa3 | 753 | EXPORT_SYMBOL(drm_gem_object_release); |
c3ae90c0 | 754 | |
673a394b | 755 | /** |
89d61fc0 DV |
756 | * drm_gem_object_free - free a GEM object |
757 | * @kref: kref of the object to free | |
758 | * | |
673a394b | 759 | * Called after the last reference to the object has been lost. |
c3ae90c0 | 760 | * Must be called holding struct_ mutex |
673a394b EA |
761 | * |
762 | * Frees the object | |
763 | */ | |
764 | void | |
765 | drm_gem_object_free(struct kref *kref) | |
766 | { | |
767 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; | |
768 | struct drm_device *dev = obj->dev; | |
769 | ||
770 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); | |
771 | ||
772 | if (dev->driver->gem_free_object != NULL) | |
773 | dev->driver->gem_free_object(obj); | |
673a394b EA |
774 | } |
775 | EXPORT_SYMBOL(drm_gem_object_free); | |
776 | ||
ab00b3e5 JB |
777 | void drm_gem_vm_open(struct vm_area_struct *vma) |
778 | { | |
779 | struct drm_gem_object *obj = vma->vm_private_data; | |
780 | ||
781 | drm_gem_object_reference(obj); | |
31dfbc93 CW |
782 | |
783 | mutex_lock(&obj->dev->struct_mutex); | |
b06d66be | 784 | drm_vm_open_locked(obj->dev, vma); |
31dfbc93 | 785 | mutex_unlock(&obj->dev->struct_mutex); |
ab00b3e5 JB |
786 | } |
787 | EXPORT_SYMBOL(drm_gem_vm_open); | |
788 | ||
789 | void drm_gem_vm_close(struct vm_area_struct *vma) | |
790 | { | |
791 | struct drm_gem_object *obj = vma->vm_private_data; | |
b74ad5ae | 792 | struct drm_device *dev = obj->dev; |
ab00b3e5 | 793 | |
b74ad5ae | 794 | mutex_lock(&dev->struct_mutex); |
b06d66be | 795 | drm_vm_close_locked(obj->dev, vma); |
31dfbc93 | 796 | drm_gem_object_unreference(obj); |
b74ad5ae | 797 | mutex_unlock(&dev->struct_mutex); |
ab00b3e5 JB |
798 | } |
799 | EXPORT_SYMBOL(drm_gem_vm_close); | |
800 | ||
1c5aafa6 LP |
801 | /** |
802 | * drm_gem_mmap_obj - memory map a GEM object | |
803 | * @obj: the GEM object to map | |
804 | * @obj_size: the object size to be mapped, in bytes | |
805 | * @vma: VMA for the area to be mapped | |
806 | * | |
807 | * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops | |
808 | * provided by the driver. Depending on their requirements, drivers can either | |
809 | * provide a fault handler in their gem_vm_ops (in which case any accesses to | |
810 | * the object will be trapped, to perform migration, GTT binding, surface | |
811 | * register allocation, or performance monitoring), or mmap the buffer memory | |
812 | * synchronously after calling drm_gem_mmap_obj. | |
813 | * | |
814 | * This function is mainly intended to implement the DMABUF mmap operation, when | |
815 | * the GEM object is not looked up based on its fake offset. To implement the | |
816 | * DRM mmap operation, drivers should use the drm_gem_mmap() function. | |
817 | * | |
ca481c9b DH |
818 | * drm_gem_mmap_obj() assumes the user is granted access to the buffer while |
819 | * drm_gem_mmap() prevents unprivileged users from mapping random objects. So | |
820 | * callers must verify access restrictions before calling this helper. | |
821 | * | |
4368dd84 YC |
822 | * NOTE: This function has to be protected with dev->struct_mutex |
823 | * | |
1c5aafa6 LP |
824 | * Return 0 or success or -EINVAL if the object size is smaller than the VMA |
825 | * size, or if no gem_vm_ops are provided. | |
826 | */ | |
827 | int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, | |
828 | struct vm_area_struct *vma) | |
829 | { | |
830 | struct drm_device *dev = obj->dev; | |
831 | ||
4368dd84 YC |
832 | lockdep_assert_held(&dev->struct_mutex); |
833 | ||
1c5aafa6 LP |
834 | /* Check for valid size. */ |
835 | if (obj_size < vma->vm_end - vma->vm_start) | |
836 | return -EINVAL; | |
837 | ||
838 | if (!dev->driver->gem_vm_ops) | |
839 | return -EINVAL; | |
840 | ||
841 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; | |
842 | vma->vm_ops = dev->driver->gem_vm_ops; | |
843 | vma->vm_private_data = obj; | |
16d2831d | 844 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
1c5aafa6 LP |
845 | |
846 | /* Take a ref for this mapping of the object, so that the fault | |
847 | * handler can dereference the mmap offset's pointer to the object. | |
848 | * This reference is cleaned up by the corresponding vm_close | |
849 | * (which should happen whether the vma was created by this call, or | |
850 | * by a vm_open due to mremap or partial unmap or whatever). | |
851 | */ | |
852 | drm_gem_object_reference(obj); | |
853 | ||
854 | drm_vm_open_locked(dev, vma); | |
855 | return 0; | |
856 | } | |
857 | EXPORT_SYMBOL(drm_gem_mmap_obj); | |
ab00b3e5 | 858 | |
a2c0a97b JB |
859 | /** |
860 | * drm_gem_mmap - memory map routine for GEM objects | |
861 | * @filp: DRM file pointer | |
862 | * @vma: VMA for the area to be mapped | |
863 | * | |
864 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
865 | * descriptor will end up here. | |
866 | * | |
1c5aafa6 | 867 | * Look up the GEM object based on the offset passed in (vma->vm_pgoff will |
a2c0a97b | 868 | * contain the fake offset we created when the GTT map ioctl was called on |
1c5aafa6 | 869 | * the object) and map it with a call to drm_gem_mmap_obj(). |
ca481c9b DH |
870 | * |
871 | * If the caller is not granted access to the buffer object, the mmap will fail | |
872 | * with EACCES. Please see the vma manager for more information. | |
a2c0a97b JB |
873 | */ |
874 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
875 | { | |
876 | struct drm_file *priv = filp->private_data; | |
877 | struct drm_device *dev = priv->minor->dev; | |
0de23977 DH |
878 | struct drm_gem_object *obj; |
879 | struct drm_vma_offset_node *node; | |
a8469aa8 | 880 | int ret; |
a2c0a97b | 881 | |
2c07a21d DA |
882 | if (drm_device_is_unplugged(dev)) |
883 | return -ENODEV; | |
884 | ||
a2c0a97b JB |
885 | mutex_lock(&dev->struct_mutex); |
886 | ||
b04a5906 DV |
887 | node = drm_vma_offset_exact_lookup(dev->vma_offset_manager, |
888 | vma->vm_pgoff, | |
0de23977 DH |
889 | vma_pages(vma)); |
890 | if (!node) { | |
a2c0a97b | 891 | mutex_unlock(&dev->struct_mutex); |
197633b9 | 892 | return -EINVAL; |
ca481c9b DH |
893 | } else if (!drm_vma_node_is_allowed(node, filp)) { |
894 | mutex_unlock(&dev->struct_mutex); | |
895 | return -EACCES; | |
a2c0a97b JB |
896 | } |
897 | ||
0de23977 | 898 | obj = container_of(node, struct drm_gem_object, vma_node); |
aed2c03c | 899 | ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma); |
a2c0a97b | 900 | |
a2c0a97b JB |
901 | mutex_unlock(&dev->struct_mutex); |
902 | ||
903 | return ret; | |
904 | } | |
905 | EXPORT_SYMBOL(drm_gem_mmap); |