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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> |
673a394b EA |
41 | |
42 | /** @file drm_gem.c | |
43 | * | |
44 | * This file provides some of the base ioctls and library routines for | |
45 | * the graphics memory manager implemented by each device driver. | |
46 | * | |
47 | * Because various devices have different requirements in terms of | |
48 | * synchronization and migration strategies, implementing that is left up to | |
49 | * the driver, and all that the general API provides should be generic -- | |
50 | * allocating objects, reading/writing data with the cpu, freeing objects. | |
51 | * Even there, platform-dependent optimizations for reading/writing data with | |
52 | * the CPU mean we'll likely hook those out to driver-specific calls. However, | |
53 | * the DRI2 implementation wants to have at least allocate/mmap be generic. | |
54 | * | |
55 | * The goal was to have swap-backed object allocation managed through | |
56 | * struct file. However, file descriptors as handles to a struct file have | |
57 | * two major failings: | |
58 | * - Process limits prevent more than 1024 or so being used at a time by | |
59 | * default. | |
60 | * - Inability to allocate high fds will aggravate the X Server's select() | |
61 | * handling, and likely that of many GL client applications as well. | |
62 | * | |
63 | * This led to a plan of using our own integer IDs (called handles, following | |
64 | * DRM terminology) to mimic fds, and implement the fd syscalls we need as | |
65 | * ioctls. The objects themselves will still include the struct file so | |
66 | * that we can transition to fds if the required kernel infrastructure shows | |
67 | * up at a later date, and as our interface with shmfs for memory allocation. | |
68 | */ | |
69 | ||
a2c0a97b JB |
70 | /* |
71 | * We make up offsets for buffer objects so we can recognize them at | |
72 | * mmap time. | |
73 | */ | |
05269a3a JC |
74 | |
75 | /* pgoff in mmap is an unsigned long, so we need to make sure that | |
76 | * the faked up offset will fit | |
77 | */ | |
78 | ||
79 | #if BITS_PER_LONG == 64 | |
a2c0a97b JB |
80 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
81 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
05269a3a JC |
82 | #else |
83 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) | |
84 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) | |
85 | #endif | |
a2c0a97b | 86 | |
673a394b EA |
87 | /** |
88 | * Initialize the GEM device fields | |
89 | */ | |
90 | ||
91 | int | |
92 | drm_gem_init(struct drm_device *dev) | |
93 | { | |
a2c0a97b JB |
94 | struct drm_gem_mm *mm; |
95 | ||
cd4f013f | 96 | mutex_init(&dev->object_name_lock); |
673a394b | 97 | idr_init(&dev->object_name_idr); |
a2c0a97b | 98 | |
9a298b2a | 99 | mm = kzalloc(sizeof(struct drm_gem_mm), GFP_KERNEL); |
a2c0a97b JB |
100 | if (!mm) { |
101 | DRM_ERROR("out of memory\n"); | |
102 | return -ENOMEM; | |
103 | } | |
104 | ||
105 | dev->mm_private = mm; | |
0de23977 DH |
106 | drm_vma_offset_manager_init(&mm->vma_manager, |
107 | DRM_FILE_PAGE_OFFSET_START, | |
108 | DRM_FILE_PAGE_OFFSET_SIZE); | |
a2c0a97b | 109 | |
673a394b EA |
110 | return 0; |
111 | } | |
112 | ||
a2c0a97b JB |
113 | void |
114 | drm_gem_destroy(struct drm_device *dev) | |
115 | { | |
116 | struct drm_gem_mm *mm = dev->mm_private; | |
117 | ||
0de23977 | 118 | drm_vma_offset_manager_destroy(&mm->vma_manager); |
9a298b2a | 119 | kfree(mm); |
a2c0a97b JB |
120 | dev->mm_private = NULL; |
121 | } | |
122 | ||
1d397043 | 123 | /** |
62cb7011 | 124 | * Initialize an already allocated GEM object of the specified size with |
1d397043 DV |
125 | * shmfs backing store. |
126 | */ | |
127 | int drm_gem_object_init(struct drm_device *dev, | |
128 | struct drm_gem_object *obj, size_t size) | |
129 | { | |
89c8233f | 130 | struct file *filp; |
1d397043 | 131 | |
89c8233f DH |
132 | filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); |
133 | if (IS_ERR(filp)) | |
134 | return PTR_ERR(filp); | |
1d397043 | 135 | |
89c8233f DH |
136 | drm_gem_private_object_init(dev, obj, size); |
137 | obj->filp = filp; | |
1d397043 | 138 | |
1d397043 DV |
139 | return 0; |
140 | } | |
141 | EXPORT_SYMBOL(drm_gem_object_init); | |
142 | ||
62cb7011 AC |
143 | /** |
144 | * Initialize an already allocated GEM object of the specified size with | |
145 | * no GEM provided backing store. Instead the caller is responsible for | |
146 | * backing the object and handling it. | |
147 | */ | |
89c8233f DH |
148 | void drm_gem_private_object_init(struct drm_device *dev, |
149 | struct drm_gem_object *obj, size_t size) | |
62cb7011 AC |
150 | { |
151 | BUG_ON((size & (PAGE_SIZE - 1)) != 0); | |
152 | ||
153 | obj->dev = dev; | |
154 | obj->filp = NULL; | |
155 | ||
156 | kref_init(&obj->refcount); | |
a8e11d1c | 157 | obj->handle_count = 0; |
62cb7011 | 158 | obj->size = size; |
88d7ebe5 | 159 | drm_vma_node_reset(&obj->vma_node); |
62cb7011 AC |
160 | } |
161 | EXPORT_SYMBOL(drm_gem_private_object_init); | |
162 | ||
0ff926c7 DA |
163 | static void |
164 | drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) | |
165 | { | |
319c933c DV |
166 | /* |
167 | * Note: obj->dma_buf can't disappear as long as we still hold a | |
168 | * handle reference in obj->handle_count. | |
169 | */ | |
d0b2c533 | 170 | mutex_lock(&filp->prime.lock); |
319c933c | 171 | if (obj->dma_buf) { |
d0b2c533 DV |
172 | drm_prime_remove_buf_handle_locked(&filp->prime, |
173 | obj->dma_buf); | |
0ff926c7 | 174 | } |
d0b2c533 | 175 | mutex_unlock(&filp->prime.lock); |
0ff926c7 DA |
176 | } |
177 | ||
36da5908 DV |
178 | /** |
179 | * Called after the last handle to the object has been closed | |
180 | * | |
181 | * Removes any name for the object. Note that this must be | |
182 | * called before drm_gem_object_free or we'll be touching | |
183 | * freed memory | |
184 | */ | |
185 | static void drm_gem_object_handle_free(struct drm_gem_object *obj) | |
186 | { | |
187 | struct drm_device *dev = obj->dev; | |
188 | ||
189 | /* Remove any name for this object */ | |
36da5908 DV |
190 | if (obj->name) { |
191 | idr_remove(&dev->object_name_idr, obj->name); | |
192 | obj->name = 0; | |
a8e11d1c | 193 | } |
36da5908 DV |
194 | } |
195 | ||
319c933c DV |
196 | static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) |
197 | { | |
198 | /* Unbreak the reference cycle if we have an exported dma_buf. */ | |
199 | if (obj->dma_buf) { | |
200 | dma_buf_put(obj->dma_buf); | |
201 | obj->dma_buf = NULL; | |
202 | } | |
203 | } | |
204 | ||
becee2a5 | 205 | static void |
36da5908 DV |
206 | drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj) |
207 | { | |
a8e11d1c | 208 | if (WARN_ON(obj->handle_count == 0)) |
36da5908 DV |
209 | return; |
210 | ||
211 | /* | |
212 | * Must bump handle count first as this may be the last | |
213 | * ref, in which case the object would disappear before we | |
214 | * checked for a name | |
215 | */ | |
216 | ||
cd4f013f | 217 | mutex_lock(&obj->dev->object_name_lock); |
319c933c | 218 | if (--obj->handle_count == 0) { |
36da5908 | 219 | drm_gem_object_handle_free(obj); |
319c933c DV |
220 | drm_gem_object_exported_dma_buf_free(obj); |
221 | } | |
cd4f013f | 222 | mutex_unlock(&obj->dev->object_name_lock); |
a8e11d1c | 223 | |
36da5908 DV |
224 | drm_gem_object_unreference_unlocked(obj); |
225 | } | |
226 | ||
673a394b EA |
227 | /** |
228 | * Removes the mapping from handle to filp for this object. | |
229 | */ | |
ff72145b | 230 | int |
a1a2d1d3 | 231 | drm_gem_handle_delete(struct drm_file *filp, u32 handle) |
673a394b EA |
232 | { |
233 | struct drm_device *dev; | |
234 | struct drm_gem_object *obj; | |
235 | ||
236 | /* This is gross. The idr system doesn't let us try a delete and | |
237 | * return an error code. It just spews if you fail at deleting. | |
238 | * So, we have to grab a lock around finding the object and then | |
239 | * doing the delete on it and dropping the refcount, or the user | |
240 | * could race us to double-decrement the refcount and cause a | |
241 | * use-after-free later. Given the frequency of our handle lookups, | |
242 | * we may want to use ida for number allocation and a hash table | |
243 | * for the pointers, anyway. | |
244 | */ | |
245 | spin_lock(&filp->table_lock); | |
246 | ||
247 | /* Check if we currently have a reference on the object */ | |
248 | obj = idr_find(&filp->object_idr, handle); | |
249 | if (obj == NULL) { | |
250 | spin_unlock(&filp->table_lock); | |
251 | return -EINVAL; | |
252 | } | |
253 | dev = obj->dev; | |
254 | ||
255 | /* Release reference and decrement refcount. */ | |
256 | idr_remove(&filp->object_idr, handle); | |
257 | spin_unlock(&filp->table_lock); | |
258 | ||
9c784855 TR |
259 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
260 | drm_gem_remove_prime_handles(obj, filp); | |
ca481c9b | 261 | drm_vma_node_revoke(&obj->vma_node, filp->filp); |
3248877e | 262 | |
304eda32 BS |
263 | if (dev->driver->gem_close_object) |
264 | dev->driver->gem_close_object(obj, filp); | |
bc9025bd | 265 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
266 | |
267 | return 0; | |
268 | } | |
ff72145b | 269 | EXPORT_SYMBOL(drm_gem_handle_delete); |
673a394b | 270 | |
43387b37 DV |
271 | /** |
272 | * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers | |
273 | * | |
274 | * This implements the ->dumb_destroy kms driver callback for drivers which use | |
275 | * gem to manage their backing storage. | |
276 | */ | |
277 | int drm_gem_dumb_destroy(struct drm_file *file, | |
278 | struct drm_device *dev, | |
279 | uint32_t handle) | |
280 | { | |
281 | return drm_gem_handle_delete(file, handle); | |
282 | } | |
283 | EXPORT_SYMBOL(drm_gem_dumb_destroy); | |
284 | ||
673a394b | 285 | /** |
20228c44 DV |
286 | * drm_gem_handle_create_tail - internal functions to create a handle |
287 | * | |
288 | * This expects the dev->object_name_lock to be held already and will drop it | |
289 | * before returning. Used to avoid races in establishing new handles when | |
290 | * importing an object from either an flink name or a dma-buf. | |
673a394b EA |
291 | */ |
292 | int | |
20228c44 DV |
293 | drm_gem_handle_create_tail(struct drm_file *file_priv, |
294 | struct drm_gem_object *obj, | |
295 | u32 *handlep) | |
673a394b | 296 | { |
304eda32 BS |
297 | struct drm_device *dev = obj->dev; |
298 | int ret; | |
673a394b | 299 | |
20228c44 DV |
300 | WARN_ON(!mutex_is_locked(&dev->object_name_lock)); |
301 | ||
673a394b | 302 | /* |
2e928815 TH |
303 | * Get the user-visible handle using idr. Preload and perform |
304 | * allocation under our spinlock. | |
673a394b | 305 | */ |
2e928815 | 306 | idr_preload(GFP_KERNEL); |
673a394b | 307 | spin_lock(&file_priv->table_lock); |
2e928815 TH |
308 | |
309 | ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); | |
a8e11d1c DV |
310 | drm_gem_object_reference(obj); |
311 | obj->handle_count++; | |
673a394b | 312 | spin_unlock(&file_priv->table_lock); |
2e928815 | 313 | idr_preload_end(); |
cd4f013f | 314 | mutex_unlock(&dev->object_name_lock); |
a8e11d1c DV |
315 | if (ret < 0) { |
316 | drm_gem_object_handle_unreference_unlocked(obj); | |
673a394b | 317 | return ret; |
a8e11d1c | 318 | } |
2e928815 | 319 | *handlep = ret; |
673a394b | 320 | |
ca481c9b DH |
321 | ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp); |
322 | if (ret) { | |
323 | drm_gem_handle_delete(file_priv, *handlep); | |
324 | return ret; | |
325 | } | |
304eda32 BS |
326 | |
327 | if (dev->driver->gem_open_object) { | |
328 | ret = dev->driver->gem_open_object(obj, file_priv); | |
329 | if (ret) { | |
330 | drm_gem_handle_delete(file_priv, *handlep); | |
331 | return ret; | |
332 | } | |
333 | } | |
334 | ||
673a394b EA |
335 | return 0; |
336 | } | |
20228c44 DV |
337 | |
338 | /** | |
339 | * Create a handle for this object. This adds a handle reference | |
340 | * to the object, which includes a regular reference count. Callers | |
341 | * will likely want to dereference the object afterwards. | |
342 | */ | |
343 | int | |
344 | drm_gem_handle_create(struct drm_file *file_priv, | |
345 | struct drm_gem_object *obj, | |
346 | u32 *handlep) | |
347 | { | |
348 | mutex_lock(&obj->dev->object_name_lock); | |
349 | ||
350 | return drm_gem_handle_create_tail(file_priv, obj, handlep); | |
351 | } | |
673a394b EA |
352 | EXPORT_SYMBOL(drm_gem_handle_create); |
353 | ||
75ef8b3b RC |
354 | |
355 | /** | |
356 | * drm_gem_free_mmap_offset - release a fake mmap offset for an object | |
357 | * @obj: obj in question | |
358 | * | |
359 | * This routine frees fake offsets allocated by drm_gem_create_mmap_offset(). | |
360 | */ | |
361 | void | |
362 | drm_gem_free_mmap_offset(struct drm_gem_object *obj) | |
363 | { | |
364 | struct drm_device *dev = obj->dev; | |
365 | struct drm_gem_mm *mm = dev->mm_private; | |
75ef8b3b | 366 | |
0de23977 | 367 | drm_vma_offset_remove(&mm->vma_manager, &obj->vma_node); |
75ef8b3b RC |
368 | } |
369 | EXPORT_SYMBOL(drm_gem_free_mmap_offset); | |
370 | ||
371 | /** | |
367bbd49 | 372 | * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object |
75ef8b3b | 373 | * @obj: obj in question |
367bbd49 | 374 | * @size: the virtual size |
75ef8b3b RC |
375 | * |
376 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
377 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
378 | * up the object based on the offset and sets up the various memory mapping | |
379 | * structures. | |
380 | * | |
367bbd49 RC |
381 | * This routine allocates and attaches a fake offset for @obj, in cases where |
382 | * the virtual size differs from the physical size (ie. obj->size). Otherwise | |
383 | * just use drm_gem_create_mmap_offset(). | |
75ef8b3b RC |
384 | */ |
385 | int | |
367bbd49 | 386 | drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) |
75ef8b3b RC |
387 | { |
388 | struct drm_device *dev = obj->dev; | |
389 | struct drm_gem_mm *mm = dev->mm_private; | |
75ef8b3b | 390 | |
0de23977 | 391 | return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node, |
367bbd49 RC |
392 | size / PAGE_SIZE); |
393 | } | |
394 | EXPORT_SYMBOL(drm_gem_create_mmap_offset_size); | |
395 | ||
396 | /** | |
397 | * drm_gem_create_mmap_offset - create a fake mmap offset for an object | |
398 | * @obj: obj in question | |
399 | * | |
400 | * GEM memory mapping works by handing back to userspace a fake mmap offset | |
401 | * it can use in a subsequent mmap(2) call. The DRM core code then looks | |
402 | * up the object based on the offset and sets up the various memory mapping | |
403 | * structures. | |
404 | * | |
405 | * This routine allocates and attaches a fake offset for @obj. | |
406 | */ | |
407 | int drm_gem_create_mmap_offset(struct drm_gem_object *obj) | |
408 | { | |
409 | return drm_gem_create_mmap_offset_size(obj, obj->size); | |
75ef8b3b RC |
410 | } |
411 | EXPORT_SYMBOL(drm_gem_create_mmap_offset); | |
412 | ||
bcc5c9d5 RC |
413 | /** |
414 | * drm_gem_get_pages - helper to allocate backing pages for a GEM object | |
415 | * from shmem | |
416 | * @obj: obj in question | |
417 | * @gfpmask: gfp mask of requested pages | |
418 | */ | |
419 | struct page **drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask) | |
420 | { | |
421 | struct inode *inode; | |
422 | struct address_space *mapping; | |
423 | struct page *p, **pages; | |
424 | int i, npages; | |
425 | ||
426 | /* This is the shared memory object that backs the GEM resource */ | |
427 | inode = file_inode(obj->filp); | |
428 | mapping = inode->i_mapping; | |
429 | ||
430 | /* We already BUG_ON() for non-page-aligned sizes in | |
431 | * drm_gem_object_init(), so we should never hit this unless | |
432 | * driver author is doing something really wrong: | |
433 | */ | |
434 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
435 | ||
436 | npages = obj->size >> PAGE_SHIFT; | |
437 | ||
438 | pages = drm_malloc_ab(npages, sizeof(struct page *)); | |
439 | if (pages == NULL) | |
440 | return ERR_PTR(-ENOMEM); | |
441 | ||
442 | gfpmask |= mapping_gfp_mask(mapping); | |
443 | ||
444 | for (i = 0; i < npages; i++) { | |
445 | p = shmem_read_mapping_page_gfp(mapping, i, gfpmask); | |
446 | if (IS_ERR(p)) | |
447 | goto fail; | |
448 | pages[i] = p; | |
449 | ||
450 | /* There is a hypothetical issue w/ drivers that require | |
451 | * buffer memory in the low 4GB.. if the pages are un- | |
452 | * pinned, and swapped out, they can end up swapped back | |
453 | * in above 4GB. If pages are already in memory, then | |
454 | * shmem_read_mapping_page_gfp will ignore the gfpmask, | |
455 | * even if the already in-memory page disobeys the mask. | |
456 | * | |
457 | * It is only a theoretical issue today, because none of | |
458 | * the devices with this limitation can be populated with | |
459 | * enough memory to trigger the issue. But this BUG_ON() | |
460 | * is here as a reminder in case the problem with | |
461 | * shmem_read_mapping_page_gfp() isn't solved by the time | |
462 | * it does become a real issue. | |
463 | * | |
464 | * See this thread: http://lkml.org/lkml/2011/7/11/238 | |
465 | */ | |
466 | BUG_ON((gfpmask & __GFP_DMA32) && | |
467 | (page_to_pfn(p) >= 0x00100000UL)); | |
468 | } | |
469 | ||
470 | return pages; | |
471 | ||
472 | fail: | |
473 | while (i--) | |
474 | page_cache_release(pages[i]); | |
475 | ||
476 | drm_free_large(pages); | |
477 | return ERR_CAST(p); | |
478 | } | |
479 | EXPORT_SYMBOL(drm_gem_get_pages); | |
480 | ||
481 | /** | |
482 | * drm_gem_put_pages - helper to free backing pages for a GEM object | |
483 | * @obj: obj in question | |
484 | * @pages: pages to free | |
485 | * @dirty: if true, pages will be marked as dirty | |
486 | * @accessed: if true, the pages will be marked as accessed | |
487 | */ | |
488 | void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, | |
489 | bool dirty, bool accessed) | |
490 | { | |
491 | int i, npages; | |
492 | ||
493 | /* We already BUG_ON() for non-page-aligned sizes in | |
494 | * drm_gem_object_init(), so we should never hit this unless | |
495 | * driver author is doing something really wrong: | |
496 | */ | |
497 | WARN_ON((obj->size & (PAGE_SIZE - 1)) != 0); | |
498 | ||
499 | npages = obj->size >> PAGE_SHIFT; | |
500 | ||
501 | for (i = 0; i < npages; i++) { | |
502 | if (dirty) | |
503 | set_page_dirty(pages[i]); | |
504 | ||
505 | if (accessed) | |
506 | mark_page_accessed(pages[i]); | |
507 | ||
508 | /* Undo the reference we took when populating the table */ | |
509 | page_cache_release(pages[i]); | |
510 | } | |
511 | ||
512 | drm_free_large(pages); | |
513 | } | |
514 | EXPORT_SYMBOL(drm_gem_put_pages); | |
515 | ||
673a394b EA |
516 | /** Returns a reference to the object named by the handle. */ |
517 | struct drm_gem_object * | |
518 | drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp, | |
a1a2d1d3 | 519 | u32 handle) |
673a394b EA |
520 | { |
521 | struct drm_gem_object *obj; | |
522 | ||
523 | spin_lock(&filp->table_lock); | |
524 | ||
525 | /* Check if we currently have a reference on the object */ | |
526 | obj = idr_find(&filp->object_idr, handle); | |
527 | if (obj == NULL) { | |
528 | spin_unlock(&filp->table_lock); | |
529 | return NULL; | |
530 | } | |
531 | ||
532 | drm_gem_object_reference(obj); | |
533 | ||
534 | spin_unlock(&filp->table_lock); | |
535 | ||
536 | return obj; | |
537 | } | |
538 | EXPORT_SYMBOL(drm_gem_object_lookup); | |
539 | ||
540 | /** | |
541 | * Releases the handle to an mm object. | |
542 | */ | |
543 | int | |
544 | drm_gem_close_ioctl(struct drm_device *dev, void *data, | |
545 | struct drm_file *file_priv) | |
546 | { | |
547 | struct drm_gem_close *args = data; | |
548 | int ret; | |
549 | ||
550 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
551 | return -ENODEV; | |
552 | ||
553 | ret = drm_gem_handle_delete(file_priv, args->handle); | |
554 | ||
555 | return ret; | |
556 | } | |
557 | ||
558 | /** | |
559 | * Create a global name for an object, returning the name. | |
560 | * | |
561 | * Note that the name does not hold a reference; when the object | |
562 | * is freed, the name goes away. | |
563 | */ | |
564 | int | |
565 | drm_gem_flink_ioctl(struct drm_device *dev, void *data, | |
566 | struct drm_file *file_priv) | |
567 | { | |
568 | struct drm_gem_flink *args = data; | |
569 | struct drm_gem_object *obj; | |
570 | int ret; | |
571 | ||
572 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
573 | return -ENODEV; | |
574 | ||
575 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); | |
576 | if (obj == NULL) | |
bf79cb91 | 577 | return -ENOENT; |
673a394b | 578 | |
cd4f013f | 579 | mutex_lock(&dev->object_name_lock); |
2e928815 | 580 | idr_preload(GFP_KERNEL); |
a8e11d1c DV |
581 | /* prevent races with concurrent gem_close. */ |
582 | if (obj->handle_count == 0) { | |
583 | ret = -ENOENT; | |
584 | goto err; | |
585 | } | |
586 | ||
8d59bae5 | 587 | if (!obj->name) { |
2e928815 | 588 | ret = idr_alloc(&dev->object_name_idr, obj, 1, 0, GFP_NOWAIT); |
2e928815 | 589 | if (ret < 0) |
8d59bae5 | 590 | goto err; |
2e07fb22 YC |
591 | |
592 | obj->name = ret; | |
8d59bae5 | 593 | } |
3e49c4f4 | 594 | |
2e07fb22 YC |
595 | args->name = (uint64_t) obj->name; |
596 | ret = 0; | |
597 | ||
3e49c4f4 | 598 | err: |
2e07fb22 | 599 | idr_preload_end(); |
cd4f013f | 600 | mutex_unlock(&dev->object_name_lock); |
bc9025bd | 601 | drm_gem_object_unreference_unlocked(obj); |
3e49c4f4 | 602 | return ret; |
673a394b EA |
603 | } |
604 | ||
605 | /** | |
606 | * Open an object using the global name, returning a handle and the size. | |
607 | * | |
608 | * This handle (of course) holds a reference to the object, so the object | |
609 | * will not go away until the handle is deleted. | |
610 | */ | |
611 | int | |
612 | drm_gem_open_ioctl(struct drm_device *dev, void *data, | |
613 | struct drm_file *file_priv) | |
614 | { | |
615 | struct drm_gem_open *args = data; | |
616 | struct drm_gem_object *obj; | |
617 | int ret; | |
a1a2d1d3 | 618 | u32 handle; |
673a394b EA |
619 | |
620 | if (!(dev->driver->driver_features & DRIVER_GEM)) | |
621 | return -ENODEV; | |
622 | ||
cd4f013f | 623 | mutex_lock(&dev->object_name_lock); |
673a394b | 624 | obj = idr_find(&dev->object_name_idr, (int) args->name); |
20228c44 | 625 | if (obj) { |
673a394b | 626 | drm_gem_object_reference(obj); |
20228c44 DV |
627 | } else { |
628 | mutex_unlock(&dev->object_name_lock); | |
673a394b | 629 | return -ENOENT; |
20228c44 | 630 | } |
673a394b | 631 | |
20228c44 DV |
632 | /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */ |
633 | ret = drm_gem_handle_create_tail(file_priv, obj, &handle); | |
bc9025bd | 634 | drm_gem_object_unreference_unlocked(obj); |
673a394b EA |
635 | if (ret) |
636 | return ret; | |
637 | ||
638 | args->handle = handle; | |
639 | args->size = obj->size; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | /** | |
645 | * Called at device open time, sets up the structure for handling refcounting | |
646 | * of mm objects. | |
647 | */ | |
648 | void | |
649 | drm_gem_open(struct drm_device *dev, struct drm_file *file_private) | |
650 | { | |
651 | idr_init(&file_private->object_idr); | |
652 | spin_lock_init(&file_private->table_lock); | |
653 | } | |
654 | ||
655 | /** | |
656 | * Called at device close to release the file's | |
657 | * handle references on objects. | |
658 | */ | |
659 | static int | |
660 | drm_gem_object_release_handle(int id, void *ptr, void *data) | |
661 | { | |
304eda32 | 662 | struct drm_file *file_priv = data; |
673a394b | 663 | struct drm_gem_object *obj = ptr; |
304eda32 BS |
664 | struct drm_device *dev = obj->dev; |
665 | ||
9c784855 TR |
666 | if (drm_core_check_feature(dev, DRIVER_PRIME)) |
667 | drm_gem_remove_prime_handles(obj, file_priv); | |
ca481c9b | 668 | drm_vma_node_revoke(&obj->vma_node, file_priv->filp); |
3248877e | 669 | |
304eda32 BS |
670 | if (dev->driver->gem_close_object) |
671 | dev->driver->gem_close_object(obj, file_priv); | |
673a394b | 672 | |
bc9025bd | 673 | drm_gem_object_handle_unreference_unlocked(obj); |
673a394b EA |
674 | |
675 | return 0; | |
676 | } | |
677 | ||
678 | /** | |
679 | * Called at close time when the filp is going away. | |
680 | * | |
681 | * Releases any remaining references on objects by this filp. | |
682 | */ | |
683 | void | |
684 | drm_gem_release(struct drm_device *dev, struct drm_file *file_private) | |
685 | { | |
673a394b | 686 | idr_for_each(&file_private->object_idr, |
304eda32 | 687 | &drm_gem_object_release_handle, file_private); |
673a394b | 688 | idr_destroy(&file_private->object_idr); |
673a394b EA |
689 | } |
690 | ||
fd632aa3 DV |
691 | void |
692 | drm_gem_object_release(struct drm_gem_object *obj) | |
c3ae90c0 | 693 | { |
319c933c DV |
694 | WARN_ON(obj->dma_buf); |
695 | ||
62cb7011 AC |
696 | if (obj->filp) |
697 | fput(obj->filp); | |
c3ae90c0 | 698 | } |
fd632aa3 | 699 | EXPORT_SYMBOL(drm_gem_object_release); |
c3ae90c0 | 700 | |
673a394b EA |
701 | /** |
702 | * Called after the last reference to the object has been lost. | |
c3ae90c0 | 703 | * Must be called holding struct_ mutex |
673a394b EA |
704 | * |
705 | * Frees the object | |
706 | */ | |
707 | void | |
708 | drm_gem_object_free(struct kref *kref) | |
709 | { | |
710 | struct drm_gem_object *obj = (struct drm_gem_object *) kref; | |
711 | struct drm_device *dev = obj->dev; | |
712 | ||
713 | BUG_ON(!mutex_is_locked(&dev->struct_mutex)); | |
714 | ||
715 | if (dev->driver->gem_free_object != NULL) | |
716 | dev->driver->gem_free_object(obj); | |
673a394b EA |
717 | } |
718 | EXPORT_SYMBOL(drm_gem_object_free); | |
719 | ||
ab00b3e5 JB |
720 | void drm_gem_vm_open(struct vm_area_struct *vma) |
721 | { | |
722 | struct drm_gem_object *obj = vma->vm_private_data; | |
723 | ||
724 | drm_gem_object_reference(obj); | |
31dfbc93 CW |
725 | |
726 | mutex_lock(&obj->dev->struct_mutex); | |
b06d66be | 727 | drm_vm_open_locked(obj->dev, vma); |
31dfbc93 | 728 | mutex_unlock(&obj->dev->struct_mutex); |
ab00b3e5 JB |
729 | } |
730 | EXPORT_SYMBOL(drm_gem_vm_open); | |
731 | ||
732 | void drm_gem_vm_close(struct vm_area_struct *vma) | |
733 | { | |
734 | struct drm_gem_object *obj = vma->vm_private_data; | |
b74ad5ae | 735 | struct drm_device *dev = obj->dev; |
ab00b3e5 | 736 | |
b74ad5ae | 737 | mutex_lock(&dev->struct_mutex); |
b06d66be | 738 | drm_vm_close_locked(obj->dev, vma); |
31dfbc93 | 739 | drm_gem_object_unreference(obj); |
b74ad5ae | 740 | mutex_unlock(&dev->struct_mutex); |
ab00b3e5 JB |
741 | } |
742 | EXPORT_SYMBOL(drm_gem_vm_close); | |
743 | ||
1c5aafa6 LP |
744 | /** |
745 | * drm_gem_mmap_obj - memory map a GEM object | |
746 | * @obj: the GEM object to map | |
747 | * @obj_size: the object size to be mapped, in bytes | |
748 | * @vma: VMA for the area to be mapped | |
749 | * | |
750 | * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops | |
751 | * provided by the driver. Depending on their requirements, drivers can either | |
752 | * provide a fault handler in their gem_vm_ops (in which case any accesses to | |
753 | * the object will be trapped, to perform migration, GTT binding, surface | |
754 | * register allocation, or performance monitoring), or mmap the buffer memory | |
755 | * synchronously after calling drm_gem_mmap_obj. | |
756 | * | |
757 | * This function is mainly intended to implement the DMABUF mmap operation, when | |
758 | * the GEM object is not looked up based on its fake offset. To implement the | |
759 | * DRM mmap operation, drivers should use the drm_gem_mmap() function. | |
760 | * | |
ca481c9b DH |
761 | * drm_gem_mmap_obj() assumes the user is granted access to the buffer while |
762 | * drm_gem_mmap() prevents unprivileged users from mapping random objects. So | |
763 | * callers must verify access restrictions before calling this helper. | |
764 | * | |
4368dd84 YC |
765 | * NOTE: This function has to be protected with dev->struct_mutex |
766 | * | |
1c5aafa6 LP |
767 | * Return 0 or success or -EINVAL if the object size is smaller than the VMA |
768 | * size, or if no gem_vm_ops are provided. | |
769 | */ | |
770 | int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, | |
771 | struct vm_area_struct *vma) | |
772 | { | |
773 | struct drm_device *dev = obj->dev; | |
774 | ||
4368dd84 YC |
775 | lockdep_assert_held(&dev->struct_mutex); |
776 | ||
1c5aafa6 LP |
777 | /* Check for valid size. */ |
778 | if (obj_size < vma->vm_end - vma->vm_start) | |
779 | return -EINVAL; | |
780 | ||
781 | if (!dev->driver->gem_vm_ops) | |
782 | return -EINVAL; | |
783 | ||
784 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; | |
785 | vma->vm_ops = dev->driver->gem_vm_ops; | |
786 | vma->vm_private_data = obj; | |
787 | vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); | |
788 | ||
789 | /* Take a ref for this mapping of the object, so that the fault | |
790 | * handler can dereference the mmap offset's pointer to the object. | |
791 | * This reference is cleaned up by the corresponding vm_close | |
792 | * (which should happen whether the vma was created by this call, or | |
793 | * by a vm_open due to mremap or partial unmap or whatever). | |
794 | */ | |
795 | drm_gem_object_reference(obj); | |
796 | ||
797 | drm_vm_open_locked(dev, vma); | |
798 | return 0; | |
799 | } | |
800 | EXPORT_SYMBOL(drm_gem_mmap_obj); | |
ab00b3e5 | 801 | |
a2c0a97b JB |
802 | /** |
803 | * drm_gem_mmap - memory map routine for GEM objects | |
804 | * @filp: DRM file pointer | |
805 | * @vma: VMA for the area to be mapped | |
806 | * | |
807 | * If a driver supports GEM object mapping, mmap calls on the DRM file | |
808 | * descriptor will end up here. | |
809 | * | |
1c5aafa6 | 810 | * Look up the GEM object based on the offset passed in (vma->vm_pgoff will |
a2c0a97b | 811 | * contain the fake offset we created when the GTT map ioctl was called on |
1c5aafa6 | 812 | * the object) and map it with a call to drm_gem_mmap_obj(). |
ca481c9b DH |
813 | * |
814 | * If the caller is not granted access to the buffer object, the mmap will fail | |
815 | * with EACCES. Please see the vma manager for more information. | |
a2c0a97b JB |
816 | */ |
817 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) | |
818 | { | |
819 | struct drm_file *priv = filp->private_data; | |
820 | struct drm_device *dev = priv->minor->dev; | |
821 | struct drm_gem_mm *mm = dev->mm_private; | |
0de23977 DH |
822 | struct drm_gem_object *obj; |
823 | struct drm_vma_offset_node *node; | |
a2c0a97b JB |
824 | int ret = 0; |
825 | ||
2c07a21d DA |
826 | if (drm_device_is_unplugged(dev)) |
827 | return -ENODEV; | |
828 | ||
a2c0a97b JB |
829 | mutex_lock(&dev->struct_mutex); |
830 | ||
0de23977 DH |
831 | node = drm_vma_offset_exact_lookup(&mm->vma_manager, vma->vm_pgoff, |
832 | vma_pages(vma)); | |
833 | if (!node) { | |
a2c0a97b JB |
834 | mutex_unlock(&dev->struct_mutex); |
835 | return drm_mmap(filp, vma); | |
ca481c9b DH |
836 | } else if (!drm_vma_node_is_allowed(node, filp)) { |
837 | mutex_unlock(&dev->struct_mutex); | |
838 | return -EACCES; | |
a2c0a97b JB |
839 | } |
840 | ||
0de23977 | 841 | obj = container_of(node, struct drm_gem_object, vma_node); |
aed2c03c | 842 | ret = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma); |
a2c0a97b | 843 | |
a2c0a97b JB |
844 | mutex_unlock(&dev->struct_mutex); |
845 | ||
846 | return ret; | |
847 | } | |
848 | EXPORT_SYMBOL(drm_gem_mmap); |