1 | /* |
2 | * Legacy: Generic DRM Buffer Management |
3 | * |
4 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. |
5 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
6 | * All Rights Reserved. |
7 | * |
8 | * Author: Rickard E. (Rik) Faith <faith@valinux.com> |
9 | * Author: Gareth Hughes <gareth@valinux.com> |
10 | * |
11 | * Permission is hereby granted, free of charge, to any person obtaining a |
12 | * copy of this software and associated documentation files (the "Software"), |
13 | * to deal in the Software without restriction, including without limitation |
14 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
15 | * and/or sell copies of the Software, and to permit persons to whom the |
16 | * Software is furnished to do so, subject to the following conditions: |
17 | * |
18 | * The above copyright notice and this permission notice (including the next |
19 | * paragraph) shall be included in all copies or substantial portions of the |
20 | * Software. |
21 | * |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
24 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
25 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
26 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
27 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
28 | * OTHER DEALINGS IN THE SOFTWARE. |
29 | */ |
30 | |
31 | #include <linux/export.h> |
32 | #include <linux/log2.h> |
33 | #include <linux/mm.h> |
34 | #include <linux/mman.h> |
35 | #include <linux/nospec.h> |
36 | #include <linux/pci.h> |
37 | #include <linux/slab.h> |
38 | #include <linux/uaccess.h> |
39 | #include <linux/vmalloc.h> |
40 | |
41 | #include <asm/shmparam.h> |
42 | |
43 | #include <drm/drm_device.h> |
44 | #include <drm/drm_drv.h> |
45 | #include <drm/drm_file.h> |
46 | #include <drm/drm_print.h> |
47 | |
48 | #include "drm_legacy.h" |
49 | |
50 | |
51 | static struct drm_map_list *drm_find_matching_map(struct drm_device *dev, |
52 | struct drm_local_map *map) |
53 | { |
54 | struct drm_map_list *entry; |
55 | |
56 | list_for_each_entry(entry, &dev->maplist, head) { |
57 | /* |
58 | * Because the kernel-userspace ABI is fixed at a 32-bit offset |
59 | * while PCI resources may live above that, we only compare the |
60 | * lower 32 bits of the map offset for maps of type |
61 | * _DRM_FRAMEBUFFER or _DRM_REGISTERS. |
62 | * It is assumed that if a driver have more than one resource |
63 | * of each type, the lower 32 bits are different. |
64 | */ |
65 | if (!entry->map || |
66 | map->type != entry->map->type || |
67 | entry->master != dev->master) |
68 | continue; |
69 | switch (map->type) { |
70 | case _DRM_SHM: |
71 | if (map->flags != _DRM_CONTAINS_LOCK) |
72 | break; |
73 | return entry; |
74 | case _DRM_REGISTERS: |
75 | case _DRM_FRAME_BUFFER: |
76 | if ((entry->map->offset & 0xffffffff) == |
77 | (map->offset & 0xffffffff)) |
78 | return entry; |
79 | break; |
80 | default: /* Make gcc happy */ |
81 | break; |
82 | } |
83 | if (entry->map->offset == map->offset) |
84 | return entry; |
85 | } |
86 | |
87 | return NULL; |
88 | } |
89 | |
90 | static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash, |
91 | unsigned long user_token, int hashed_handle, int shm) |
92 | { |
93 | int use_hashed_handle, shift; |
94 | unsigned long add; |
95 | |
96 | #if (BITS_PER_LONG == 64) |
97 | use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle); |
98 | #elif (BITS_PER_LONG == 32) |
99 | use_hashed_handle = hashed_handle; |
100 | #else |
101 | #error Unsupported long size. Neither 64 nor 32 bits. |
102 | #endif |
103 | |
104 | if (!use_hashed_handle) { |
105 | int ret; |
106 | |
107 | hash->key = user_token >> PAGE_SHIFT; |
108 | ret = drm_ht_insert_item(ht: &dev->map_hash, item: hash); |
109 | if (ret != -EINVAL) |
110 | return ret; |
111 | } |
112 | |
113 | shift = 0; |
114 | add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT; |
115 | if (shm && (SHMLBA > PAGE_SIZE)) { |
116 | int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1; |
117 | |
118 | /* For shared memory, we have to preserve the SHMLBA |
119 | * bits of the eventual vma->vm_pgoff value during |
120 | * mmap(). Otherwise we run into cache aliasing problems |
121 | * on some platforms. On these platforms, the pgoff of |
122 | * a mmap() request is used to pick a suitable virtual |
123 | * address for the mmap() region such that it will not |
124 | * cause cache aliasing problems. |
125 | * |
126 | * Therefore, make sure the SHMLBA relevant bits of the |
127 | * hash value we use are equal to those in the original |
128 | * kernel virtual address. |
129 | */ |
130 | shift = bits; |
131 | add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL)); |
132 | } |
133 | |
134 | return drm_ht_just_insert_please(ht: &dev->map_hash, item: hash, |
135 | seed: user_token, bits: 32 - PAGE_SHIFT - 3, |
136 | shift, add); |
137 | } |
138 | |
139 | /* |
140 | * Core function to create a range of memory available for mapping by a |
141 | * non-root process. |
142 | * |
143 | * Adjusts the memory offset to its absolute value according to the mapping |
144 | * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where |
145 | * applicable and if supported by the kernel. |
146 | */ |
147 | static int drm_addmap_core(struct drm_device *dev, resource_size_t offset, |
148 | unsigned int size, enum drm_map_type type, |
149 | enum drm_map_flags flags, |
150 | struct drm_map_list **maplist) |
151 | { |
152 | struct drm_local_map *map; |
153 | struct drm_map_list *list; |
154 | unsigned long user_token; |
155 | int ret; |
156 | |
157 | map = kmalloc(size: sizeof(*map), GFP_KERNEL); |
158 | if (!map) |
159 | return -ENOMEM; |
160 | |
161 | map->offset = offset; |
162 | map->size = size; |
163 | map->flags = flags; |
164 | map->type = type; |
165 | |
166 | /* Only allow shared memory to be removable since we only keep enough |
167 | * book keeping information about shared memory to allow for removal |
168 | * when processes fork. |
169 | */ |
170 | if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) { |
171 | kfree(objp: map); |
172 | return -EINVAL; |
173 | } |
174 | DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n" , |
175 | (unsigned long long)map->offset, map->size, map->type); |
176 | |
177 | /* page-align _DRM_SHM maps. They are allocated here so there is no security |
178 | * hole created by that and it works around various broken drivers that use |
179 | * a non-aligned quantity to map the SAREA. --BenH |
180 | */ |
181 | if (map->type == _DRM_SHM) |
182 | map->size = PAGE_ALIGN(map->size); |
183 | |
184 | if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) { |
185 | kfree(objp: map); |
186 | return -EINVAL; |
187 | } |
188 | map->mtrr = -1; |
189 | map->handle = NULL; |
190 | |
191 | switch (map->type) { |
192 | case _DRM_REGISTERS: |
193 | case _DRM_FRAME_BUFFER: |
194 | #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__) |
195 | if (map->offset + (map->size-1) < map->offset || |
196 | map->offset < virt_to_phys(high_memory)) { |
197 | kfree(map); |
198 | return -EINVAL; |
199 | } |
200 | #endif |
201 | /* Some drivers preinitialize some maps, without the X Server |
202 | * needing to be aware of it. Therefore, we just return success |
203 | * when the server tries to create a duplicate map. |
204 | */ |
205 | list = drm_find_matching_map(dev, map); |
206 | if (list != NULL) { |
207 | if (list->map->size != map->size) { |
208 | DRM_DEBUG("Matching maps of type %d with " |
209 | "mismatched sizes, (%ld vs %ld)\n" , |
210 | map->type, map->size, |
211 | list->map->size); |
212 | list->map->size = map->size; |
213 | } |
214 | |
215 | kfree(objp: map); |
216 | *maplist = list; |
217 | return 0; |
218 | } |
219 | |
220 | if (map->type == _DRM_FRAME_BUFFER || |
221 | (map->flags & _DRM_WRITE_COMBINING)) { |
222 | map->mtrr = |
223 | arch_phys_wc_add(base: map->offset, size: map->size); |
224 | } |
225 | if (map->type == _DRM_REGISTERS) { |
226 | if (map->flags & _DRM_WRITE_COMBINING) |
227 | map->handle = ioremap_wc(offset: map->offset, |
228 | size: map->size); |
229 | else |
230 | map->handle = ioremap(offset: map->offset, size: map->size); |
231 | if (!map->handle) { |
232 | kfree(objp: map); |
233 | return -ENOMEM; |
234 | } |
235 | } |
236 | |
237 | break; |
238 | case _DRM_SHM: |
239 | list = drm_find_matching_map(dev, map); |
240 | if (list != NULL) { |
241 | if (list->map->size != map->size) { |
242 | DRM_DEBUG("Matching maps of type %d with " |
243 | "mismatched sizes, (%ld vs %ld)\n" , |
244 | map->type, map->size, list->map->size); |
245 | list->map->size = map->size; |
246 | } |
247 | |
248 | kfree(objp: map); |
249 | *maplist = list; |
250 | return 0; |
251 | } |
252 | map->handle = vmalloc_user(size: map->size); |
253 | DRM_DEBUG("%lu %d %p\n" , |
254 | map->size, order_base_2(map->size), map->handle); |
255 | if (!map->handle) { |
256 | kfree(objp: map); |
257 | return -ENOMEM; |
258 | } |
259 | map->offset = (unsigned long)map->handle; |
260 | if (map->flags & _DRM_CONTAINS_LOCK) { |
261 | /* Prevent a 2nd X Server from creating a 2nd lock */ |
262 | if (dev->master->lock.hw_lock != NULL) { |
263 | vfree(addr: map->handle); |
264 | kfree(objp: map); |
265 | return -EBUSY; |
266 | } |
267 | dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */ |
268 | } |
269 | break; |
270 | case _DRM_AGP: { |
271 | struct drm_agp_mem *entry; |
272 | int valid = 0; |
273 | |
274 | if (!dev->agp) { |
275 | kfree(objp: map); |
276 | return -EINVAL; |
277 | } |
278 | #ifdef __alpha__ |
279 | map->offset += dev->hose->mem_space->start; |
280 | #endif |
281 | /* In some cases (i810 driver), user space may have already |
282 | * added the AGP base itself, because dev->agp->base previously |
283 | * only got set during AGP enable. So, only add the base |
284 | * address if the map's offset isn't already within the |
285 | * aperture. |
286 | */ |
287 | if (map->offset < dev->agp->base || |
288 | map->offset > dev->agp->base + |
289 | dev->agp->agp_info.aper_size * 1024 * 1024 - 1) { |
290 | map->offset += dev->agp->base; |
291 | } |
292 | map->mtrr = dev->agp->agp_mtrr; /* for getmap */ |
293 | |
294 | /* This assumes the DRM is in total control of AGP space. |
295 | * It's not always the case as AGP can be in the control |
296 | * of user space (i.e. i810 driver). So this loop will get |
297 | * skipped and we double check that dev->agp->memory is |
298 | * actually set as well as being invalid before EPERM'ing |
299 | */ |
300 | list_for_each_entry(entry, &dev->agp->memory, head) { |
301 | if ((map->offset >= entry->bound) && |
302 | (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) { |
303 | valid = 1; |
304 | break; |
305 | } |
306 | } |
307 | if (!list_empty(head: &dev->agp->memory) && !valid) { |
308 | kfree(objp: map); |
309 | return -EPERM; |
310 | } |
311 | DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n" , |
312 | (unsigned long long)map->offset, map->size); |
313 | |
314 | break; |
315 | } |
316 | case _DRM_SCATTER_GATHER: |
317 | if (!dev->sg) { |
318 | kfree(objp: map); |
319 | return -EINVAL; |
320 | } |
321 | map->offset += (unsigned long)dev->sg->virtual; |
322 | break; |
323 | case _DRM_CONSISTENT: |
324 | /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G, |
325 | * As we're limiting the address to 2^32-1 (or less), |
326 | * casting it down to 32 bits is no problem, but we |
327 | * need to point to a 64bit variable first. |
328 | */ |
329 | map->handle = dma_alloc_coherent(dev: dev->dev, |
330 | size: map->size, |
331 | dma_handle: &map->offset, |
332 | GFP_KERNEL); |
333 | if (!map->handle) { |
334 | kfree(objp: map); |
335 | return -ENOMEM; |
336 | } |
337 | break; |
338 | default: |
339 | kfree(objp: map); |
340 | return -EINVAL; |
341 | } |
342 | |
343 | list = kzalloc(size: sizeof(*list), GFP_KERNEL); |
344 | if (!list) { |
345 | if (map->type == _DRM_REGISTERS) |
346 | iounmap(addr: map->handle); |
347 | kfree(objp: map); |
348 | return -EINVAL; |
349 | } |
350 | list->map = map; |
351 | |
352 | mutex_lock(&dev->struct_mutex); |
353 | list_add(new: &list->head, head: &dev->maplist); |
354 | |
355 | /* Assign a 32-bit handle */ |
356 | /* We do it here so that dev->struct_mutex protects the increment */ |
357 | user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle : |
358 | map->offset; |
359 | ret = drm_map_handle(dev, hash: &list->hash, user_token, hashed_handle: 0, |
360 | shm: (map->type == _DRM_SHM)); |
361 | if (ret) { |
362 | if (map->type == _DRM_REGISTERS) |
363 | iounmap(addr: map->handle); |
364 | kfree(objp: map); |
365 | kfree(objp: list); |
366 | mutex_unlock(lock: &dev->struct_mutex); |
367 | return ret; |
368 | } |
369 | |
370 | list->user_token = list->hash.key << PAGE_SHIFT; |
371 | mutex_unlock(lock: &dev->struct_mutex); |
372 | |
373 | if (!(map->flags & _DRM_DRIVER)) |
374 | list->master = dev->master; |
375 | *maplist = list; |
376 | return 0; |
377 | } |
378 | |
379 | int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset, |
380 | unsigned int size, enum drm_map_type type, |
381 | enum drm_map_flags flags, struct drm_local_map **map_ptr) |
382 | { |
383 | struct drm_map_list *list; |
384 | int rc; |
385 | |
386 | rc = drm_addmap_core(dev, offset, size, type, flags, maplist: &list); |
387 | if (!rc) |
388 | *map_ptr = list->map; |
389 | return rc; |
390 | } |
391 | EXPORT_SYMBOL(drm_legacy_addmap); |
392 | |
393 | struct drm_local_map *drm_legacy_findmap(struct drm_device *dev, |
394 | unsigned int token) |
395 | { |
396 | struct drm_map_list *_entry; |
397 | |
398 | list_for_each_entry(_entry, &dev->maplist, head) |
399 | if (_entry->user_token == token) |
400 | return _entry->map; |
401 | return NULL; |
402 | } |
403 | EXPORT_SYMBOL(drm_legacy_findmap); |
404 | |
405 | /* |
406 | * Ioctl to specify a range of memory that is available for mapping by a |
407 | * non-root process. |
408 | * |
409 | * \param inode device inode. |
410 | * \param file_priv DRM file private. |
411 | * \param cmd command. |
412 | * \param arg pointer to a drm_map structure. |
413 | * \return zero on success or a negative value on error. |
414 | * |
415 | */ |
416 | int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data, |
417 | struct drm_file *file_priv) |
418 | { |
419 | struct drm_map *map = data; |
420 | struct drm_map_list *maplist; |
421 | int err; |
422 | |
423 | if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM)) |
424 | return -EPERM; |
425 | |
426 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
427 | return -EOPNOTSUPP; |
428 | |
429 | err = drm_addmap_core(dev, offset: map->offset, size: map->size, type: map->type, |
430 | flags: map->flags, maplist: &maplist); |
431 | |
432 | if (err) |
433 | return err; |
434 | |
435 | /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */ |
436 | map->handle = (void *)(unsigned long)maplist->user_token; |
437 | |
438 | /* |
439 | * It appears that there are no users of this value whatsoever -- |
440 | * drmAddMap just discards it. Let's not encourage its use. |
441 | * (Keeping drm_addmap_core's returned mtrr value would be wrong -- |
442 | * it's not a real mtrr index anymore.) |
443 | */ |
444 | map->mtrr = -1; |
445 | |
446 | return 0; |
447 | } |
448 | |
449 | /* |
450 | * Get a mapping information. |
451 | * |
452 | * \param inode device inode. |
453 | * \param file_priv DRM file private. |
454 | * \param cmd command. |
455 | * \param arg user argument, pointing to a drm_map structure. |
456 | * |
457 | * \return zero on success or a negative number on failure. |
458 | * |
459 | * Searches for the mapping with the specified offset and copies its information |
460 | * into userspace |
461 | */ |
462 | int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data, |
463 | struct drm_file *file_priv) |
464 | { |
465 | struct drm_map *map = data; |
466 | struct drm_map_list *r_list = NULL; |
467 | struct list_head *list; |
468 | int idx; |
469 | int i; |
470 | |
471 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
472 | return -EOPNOTSUPP; |
473 | |
474 | idx = map->offset; |
475 | if (idx < 0) |
476 | return -EINVAL; |
477 | |
478 | i = 0; |
479 | mutex_lock(&dev->struct_mutex); |
480 | list_for_each(list, &dev->maplist) { |
481 | if (i == idx) { |
482 | r_list = list_entry(list, struct drm_map_list, head); |
483 | break; |
484 | } |
485 | i++; |
486 | } |
487 | if (!r_list || !r_list->map) { |
488 | mutex_unlock(lock: &dev->struct_mutex); |
489 | return -EINVAL; |
490 | } |
491 | |
492 | map->offset = r_list->map->offset; |
493 | map->size = r_list->map->size; |
494 | map->type = r_list->map->type; |
495 | map->flags = r_list->map->flags; |
496 | map->handle = (void *)(unsigned long) r_list->user_token; |
497 | map->mtrr = arch_phys_wc_index(handle: r_list->map->mtrr); |
498 | |
499 | mutex_unlock(lock: &dev->struct_mutex); |
500 | |
501 | return 0; |
502 | } |
503 | |
504 | /* |
505 | * Remove a map private from list and deallocate resources if the mapping |
506 | * isn't in use. |
507 | * |
508 | * Searches the map on drm_device::maplist, removes it from the list, see if |
509 | * it's being used, and free any associated resource (such as MTRR's) if it's not |
510 | * being on use. |
511 | * |
512 | * \sa drm_legacy_addmap |
513 | */ |
514 | int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map) |
515 | { |
516 | struct drm_map_list *r_list = NULL, *list_t; |
517 | int found = 0; |
518 | struct drm_master *master; |
519 | |
520 | /* Find the list entry for the map and remove it */ |
521 | list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) { |
522 | if (r_list->map == map) { |
523 | master = r_list->master; |
524 | list_del(entry: &r_list->head); |
525 | drm_ht_remove_key(ht: &dev->map_hash, |
526 | key: r_list->user_token >> PAGE_SHIFT); |
527 | kfree(objp: r_list); |
528 | found = 1; |
529 | break; |
530 | } |
531 | } |
532 | |
533 | if (!found) |
534 | return -EINVAL; |
535 | |
536 | switch (map->type) { |
537 | case _DRM_REGISTERS: |
538 | iounmap(addr: map->handle); |
539 | fallthrough; |
540 | case _DRM_FRAME_BUFFER: |
541 | arch_phys_wc_del(handle: map->mtrr); |
542 | break; |
543 | case _DRM_SHM: |
544 | vfree(addr: map->handle); |
545 | if (master) { |
546 | if (dev->sigdata.lock == master->lock.hw_lock) |
547 | dev->sigdata.lock = NULL; |
548 | master->lock.hw_lock = NULL; /* SHM removed */ |
549 | master->lock.file_priv = NULL; |
550 | wake_up_interruptible_all(&master->lock.lock_queue); |
551 | } |
552 | break; |
553 | case _DRM_AGP: |
554 | case _DRM_SCATTER_GATHER: |
555 | break; |
556 | case _DRM_CONSISTENT: |
557 | dma_free_coherent(dev: dev->dev, |
558 | size: map->size, |
559 | cpu_addr: map->handle, |
560 | dma_handle: map->offset); |
561 | break; |
562 | } |
563 | kfree(objp: map); |
564 | |
565 | return 0; |
566 | } |
567 | EXPORT_SYMBOL(drm_legacy_rmmap_locked); |
568 | |
569 | void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map) |
570 | { |
571 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
572 | return; |
573 | |
574 | mutex_lock(&dev->struct_mutex); |
575 | drm_legacy_rmmap_locked(dev, map); |
576 | mutex_unlock(lock: &dev->struct_mutex); |
577 | } |
578 | EXPORT_SYMBOL(drm_legacy_rmmap); |
579 | |
580 | void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master) |
581 | { |
582 | struct drm_map_list *r_list, *list_temp; |
583 | |
584 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
585 | return; |
586 | |
587 | mutex_lock(&dev->struct_mutex); |
588 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) { |
589 | if (r_list->master == master) { |
590 | drm_legacy_rmmap_locked(dev, r_list->map); |
591 | r_list = NULL; |
592 | } |
593 | } |
594 | mutex_unlock(lock: &dev->struct_mutex); |
595 | } |
596 | |
597 | void drm_legacy_rmmaps(struct drm_device *dev) |
598 | { |
599 | struct drm_map_list *r_list, *list_temp; |
600 | |
601 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) |
602 | drm_legacy_rmmap(dev, r_list->map); |
603 | } |
604 | |
605 | /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on |
606 | * the last close of the device, and this is necessary for cleanup when things |
607 | * exit uncleanly. Therefore, having userland manually remove mappings seems |
608 | * like a pointless exercise since they're going away anyway. |
609 | * |
610 | * One use case might be after addmap is allowed for normal users for SHM and |
611 | * gets used by drivers that the server doesn't need to care about. This seems |
612 | * unlikely. |
613 | * |
614 | * \param inode device inode. |
615 | * \param file_priv DRM file private. |
616 | * \param cmd command. |
617 | * \param arg pointer to a struct drm_map structure. |
618 | * \return zero on success or a negative value on error. |
619 | */ |
620 | int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data, |
621 | struct drm_file *file_priv) |
622 | { |
623 | struct drm_map *request = data; |
624 | struct drm_local_map *map = NULL; |
625 | struct drm_map_list *r_list; |
626 | int ret; |
627 | |
628 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
629 | return -EOPNOTSUPP; |
630 | |
631 | mutex_lock(&dev->struct_mutex); |
632 | list_for_each_entry(r_list, &dev->maplist, head) { |
633 | if (r_list->map && |
634 | r_list->user_token == (unsigned long)request->handle && |
635 | r_list->map->flags & _DRM_REMOVABLE) { |
636 | map = r_list->map; |
637 | break; |
638 | } |
639 | } |
640 | |
641 | /* List has wrapped around to the head pointer, or it's empty we didn't |
642 | * find anything. |
643 | */ |
644 | if (list_empty(head: &dev->maplist) || !map) { |
645 | mutex_unlock(lock: &dev->struct_mutex); |
646 | return -EINVAL; |
647 | } |
648 | |
649 | /* Register and framebuffer maps are permanent */ |
650 | if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) { |
651 | mutex_unlock(lock: &dev->struct_mutex); |
652 | return 0; |
653 | } |
654 | |
655 | ret = drm_legacy_rmmap_locked(dev, map); |
656 | |
657 | mutex_unlock(lock: &dev->struct_mutex); |
658 | |
659 | return ret; |
660 | } |
661 | |
662 | /* |
663 | * Cleanup after an error on one of the addbufs() functions. |
664 | * |
665 | * \param dev DRM device. |
666 | * \param entry buffer entry where the error occurred. |
667 | * |
668 | * Frees any pages and buffers associated with the given entry. |
669 | */ |
670 | static void drm_cleanup_buf_error(struct drm_device *dev, |
671 | struct drm_buf_entry *entry) |
672 | { |
673 | drm_dma_handle_t *dmah; |
674 | int i; |
675 | |
676 | if (entry->seg_count) { |
677 | for (i = 0; i < entry->seg_count; i++) { |
678 | if (entry->seglist[i]) { |
679 | dmah = entry->seglist[i]; |
680 | dma_free_coherent(dev: dev->dev, |
681 | size: dmah->size, |
682 | cpu_addr: dmah->vaddr, |
683 | dma_handle: dmah->busaddr); |
684 | kfree(objp: dmah); |
685 | } |
686 | } |
687 | kfree(objp: entry->seglist); |
688 | |
689 | entry->seg_count = 0; |
690 | } |
691 | |
692 | if (entry->buf_count) { |
693 | for (i = 0; i < entry->buf_count; i++) { |
694 | kfree(objp: entry->buflist[i].dev_private); |
695 | } |
696 | kfree(objp: entry->buflist); |
697 | |
698 | entry->buf_count = 0; |
699 | } |
700 | } |
701 | |
702 | #if IS_ENABLED(CONFIG_AGP) |
703 | /* |
704 | * Add AGP buffers for DMA transfers. |
705 | * |
706 | * \param dev struct drm_device to which the buffers are to be added. |
707 | * \param request pointer to a struct drm_buf_desc describing the request. |
708 | * \return zero on success or a negative number on failure. |
709 | * |
710 | * After some sanity checks creates a drm_buf structure for each buffer and |
711 | * reallocates the buffer list of the same size order to accommodate the new |
712 | * buffers. |
713 | */ |
714 | int drm_legacy_addbufs_agp(struct drm_device *dev, |
715 | struct drm_buf_desc *request) |
716 | { |
717 | struct drm_device_dma *dma = dev->dma; |
718 | struct drm_buf_entry *entry; |
719 | struct drm_agp_mem *agp_entry; |
720 | struct drm_buf *buf; |
721 | unsigned long offset; |
722 | unsigned long agp_offset; |
723 | int count; |
724 | int order; |
725 | int size; |
726 | int alignment; |
727 | int page_order; |
728 | int total; |
729 | int byte_count; |
730 | int i, valid; |
731 | struct drm_buf **temp_buflist; |
732 | |
733 | if (!dma) |
734 | return -EINVAL; |
735 | |
736 | count = request->count; |
737 | order = order_base_2(request->size); |
738 | size = 1 << order; |
739 | |
740 | alignment = (request->flags & _DRM_PAGE_ALIGN) |
741 | ? PAGE_ALIGN(size) : size; |
742 | page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; |
743 | total = PAGE_SIZE << page_order; |
744 | |
745 | byte_count = 0; |
746 | agp_offset = dev->agp->base + request->agp_start; |
747 | |
748 | DRM_DEBUG("count: %d\n" , count); |
749 | DRM_DEBUG("order: %d\n" , order); |
750 | DRM_DEBUG("size: %d\n" , size); |
751 | DRM_DEBUG("agp_offset: %lx\n" , agp_offset); |
752 | DRM_DEBUG("alignment: %d\n" , alignment); |
753 | DRM_DEBUG("page_order: %d\n" , page_order); |
754 | DRM_DEBUG("total: %d\n" , total); |
755 | |
756 | if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) |
757 | return -EINVAL; |
758 | |
759 | /* Make sure buffers are located in AGP memory that we own */ |
760 | valid = 0; |
761 | list_for_each_entry(agp_entry, &dev->agp->memory, head) { |
762 | if ((agp_offset >= agp_entry->bound) && |
763 | (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) { |
764 | valid = 1; |
765 | break; |
766 | } |
767 | } |
768 | if (!list_empty(head: &dev->agp->memory) && !valid) { |
769 | DRM_DEBUG("zone invalid\n" ); |
770 | return -EINVAL; |
771 | } |
772 | spin_lock(lock: &dev->buf_lock); |
773 | if (dev->buf_use) { |
774 | spin_unlock(lock: &dev->buf_lock); |
775 | return -EBUSY; |
776 | } |
777 | atomic_inc(v: &dev->buf_alloc); |
778 | spin_unlock(lock: &dev->buf_lock); |
779 | |
780 | mutex_lock(&dev->struct_mutex); |
781 | entry = &dma->bufs[order]; |
782 | if (entry->buf_count) { |
783 | mutex_unlock(lock: &dev->struct_mutex); |
784 | atomic_dec(v: &dev->buf_alloc); |
785 | return -ENOMEM; /* May only call once for each order */ |
786 | } |
787 | |
788 | if (count < 0 || count > 4096) { |
789 | mutex_unlock(lock: &dev->struct_mutex); |
790 | atomic_dec(v: &dev->buf_alloc); |
791 | return -EINVAL; |
792 | } |
793 | |
794 | entry->buflist = kcalloc(n: count, size: sizeof(*entry->buflist), GFP_KERNEL); |
795 | if (!entry->buflist) { |
796 | mutex_unlock(lock: &dev->struct_mutex); |
797 | atomic_dec(v: &dev->buf_alloc); |
798 | return -ENOMEM; |
799 | } |
800 | |
801 | entry->buf_size = size; |
802 | entry->page_order = page_order; |
803 | |
804 | offset = 0; |
805 | |
806 | while (entry->buf_count < count) { |
807 | buf = &entry->buflist[entry->buf_count]; |
808 | buf->idx = dma->buf_count + entry->buf_count; |
809 | buf->total = alignment; |
810 | buf->order = order; |
811 | buf->used = 0; |
812 | |
813 | buf->offset = (dma->byte_count + offset); |
814 | buf->bus_address = agp_offset + offset; |
815 | buf->address = (void *)(agp_offset + offset); |
816 | buf->next = NULL; |
817 | buf->waiting = 0; |
818 | buf->pending = 0; |
819 | buf->file_priv = NULL; |
820 | |
821 | buf->dev_priv_size = dev->driver->dev_priv_size; |
822 | buf->dev_private = kzalloc(size: buf->dev_priv_size, GFP_KERNEL); |
823 | if (!buf->dev_private) { |
824 | /* Set count correctly so we free the proper amount. */ |
825 | entry->buf_count = count; |
826 | drm_cleanup_buf_error(dev, entry); |
827 | mutex_unlock(lock: &dev->struct_mutex); |
828 | atomic_dec(v: &dev->buf_alloc); |
829 | return -ENOMEM; |
830 | } |
831 | |
832 | DRM_DEBUG("buffer %d @ %p\n" , entry->buf_count, buf->address); |
833 | |
834 | offset += alignment; |
835 | entry->buf_count++; |
836 | byte_count += PAGE_SIZE << page_order; |
837 | } |
838 | |
839 | DRM_DEBUG("byte_count: %d\n" , byte_count); |
840 | |
841 | temp_buflist = krealloc(objp: dma->buflist, |
842 | new_size: (dma->buf_count + entry->buf_count) * |
843 | sizeof(*dma->buflist), GFP_KERNEL); |
844 | if (!temp_buflist) { |
845 | /* Free the entry because it isn't valid */ |
846 | drm_cleanup_buf_error(dev, entry); |
847 | mutex_unlock(lock: &dev->struct_mutex); |
848 | atomic_dec(v: &dev->buf_alloc); |
849 | return -ENOMEM; |
850 | } |
851 | dma->buflist = temp_buflist; |
852 | |
853 | for (i = 0; i < entry->buf_count; i++) { |
854 | dma->buflist[i + dma->buf_count] = &entry->buflist[i]; |
855 | } |
856 | |
857 | dma->buf_count += entry->buf_count; |
858 | dma->seg_count += entry->seg_count; |
859 | dma->page_count += byte_count >> PAGE_SHIFT; |
860 | dma->byte_count += byte_count; |
861 | |
862 | DRM_DEBUG("dma->buf_count : %d\n" , dma->buf_count); |
863 | DRM_DEBUG("entry->buf_count : %d\n" , entry->buf_count); |
864 | |
865 | mutex_unlock(lock: &dev->struct_mutex); |
866 | |
867 | request->count = entry->buf_count; |
868 | request->size = size; |
869 | |
870 | dma->flags = _DRM_DMA_USE_AGP; |
871 | |
872 | atomic_dec(v: &dev->buf_alloc); |
873 | return 0; |
874 | } |
875 | EXPORT_SYMBOL(drm_legacy_addbufs_agp); |
876 | #endif /* CONFIG_AGP */ |
877 | |
878 | int drm_legacy_addbufs_pci(struct drm_device *dev, |
879 | struct drm_buf_desc *request) |
880 | { |
881 | struct drm_device_dma *dma = dev->dma; |
882 | int count; |
883 | int order; |
884 | int size; |
885 | int total; |
886 | int page_order; |
887 | struct drm_buf_entry *entry; |
888 | drm_dma_handle_t *dmah; |
889 | struct drm_buf *buf; |
890 | int alignment; |
891 | unsigned long offset; |
892 | int i; |
893 | int byte_count; |
894 | int page_count; |
895 | unsigned long *temp_pagelist; |
896 | struct drm_buf **temp_buflist; |
897 | |
898 | if (!drm_core_check_feature(dev, feature: DRIVER_PCI_DMA)) |
899 | return -EOPNOTSUPP; |
900 | |
901 | if (!dma) |
902 | return -EINVAL; |
903 | |
904 | if (!capable(CAP_SYS_ADMIN)) |
905 | return -EPERM; |
906 | |
907 | count = request->count; |
908 | order = order_base_2(request->size); |
909 | size = 1 << order; |
910 | |
911 | DRM_DEBUG("count=%d, size=%d (%d), order=%d\n" , |
912 | request->count, request->size, size, order); |
913 | |
914 | if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) |
915 | return -EINVAL; |
916 | |
917 | alignment = (request->flags & _DRM_PAGE_ALIGN) |
918 | ? PAGE_ALIGN(size) : size; |
919 | page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; |
920 | total = PAGE_SIZE << page_order; |
921 | |
922 | spin_lock(lock: &dev->buf_lock); |
923 | if (dev->buf_use) { |
924 | spin_unlock(lock: &dev->buf_lock); |
925 | return -EBUSY; |
926 | } |
927 | atomic_inc(v: &dev->buf_alloc); |
928 | spin_unlock(lock: &dev->buf_lock); |
929 | |
930 | mutex_lock(&dev->struct_mutex); |
931 | entry = &dma->bufs[order]; |
932 | if (entry->buf_count) { |
933 | mutex_unlock(lock: &dev->struct_mutex); |
934 | atomic_dec(v: &dev->buf_alloc); |
935 | return -ENOMEM; /* May only call once for each order */ |
936 | } |
937 | |
938 | if (count < 0 || count > 4096) { |
939 | mutex_unlock(lock: &dev->struct_mutex); |
940 | atomic_dec(v: &dev->buf_alloc); |
941 | return -EINVAL; |
942 | } |
943 | |
944 | entry->buflist = kcalloc(n: count, size: sizeof(*entry->buflist), GFP_KERNEL); |
945 | if (!entry->buflist) { |
946 | mutex_unlock(lock: &dev->struct_mutex); |
947 | atomic_dec(v: &dev->buf_alloc); |
948 | return -ENOMEM; |
949 | } |
950 | |
951 | entry->seglist = kcalloc(n: count, size: sizeof(*entry->seglist), GFP_KERNEL); |
952 | if (!entry->seglist) { |
953 | kfree(objp: entry->buflist); |
954 | mutex_unlock(lock: &dev->struct_mutex); |
955 | atomic_dec(v: &dev->buf_alloc); |
956 | return -ENOMEM; |
957 | } |
958 | |
959 | /* Keep the original pagelist until we know all the allocations |
960 | * have succeeded |
961 | */ |
962 | temp_pagelist = kmalloc_array(n: dma->page_count + (count << page_order), |
963 | size: sizeof(*dma->pagelist), |
964 | GFP_KERNEL); |
965 | if (!temp_pagelist) { |
966 | kfree(objp: entry->buflist); |
967 | kfree(objp: entry->seglist); |
968 | mutex_unlock(lock: &dev->struct_mutex); |
969 | atomic_dec(v: &dev->buf_alloc); |
970 | return -ENOMEM; |
971 | } |
972 | memcpy(temp_pagelist, |
973 | dma->pagelist, dma->page_count * sizeof(*dma->pagelist)); |
974 | DRM_DEBUG("pagelist: %d entries\n" , |
975 | dma->page_count + (count << page_order)); |
976 | |
977 | entry->buf_size = size; |
978 | entry->page_order = page_order; |
979 | byte_count = 0; |
980 | page_count = 0; |
981 | |
982 | while (entry->buf_count < count) { |
983 | dmah = kmalloc(size: sizeof(drm_dma_handle_t), GFP_KERNEL); |
984 | if (!dmah) { |
985 | /* Set count correctly so we free the proper amount. */ |
986 | entry->buf_count = count; |
987 | entry->seg_count = count; |
988 | drm_cleanup_buf_error(dev, entry); |
989 | kfree(objp: temp_pagelist); |
990 | mutex_unlock(lock: &dev->struct_mutex); |
991 | atomic_dec(v: &dev->buf_alloc); |
992 | return -ENOMEM; |
993 | } |
994 | |
995 | dmah->size = total; |
996 | dmah->vaddr = dma_alloc_coherent(dev: dev->dev, |
997 | size: dmah->size, |
998 | dma_handle: &dmah->busaddr, |
999 | GFP_KERNEL); |
1000 | if (!dmah->vaddr) { |
1001 | kfree(objp: dmah); |
1002 | |
1003 | /* Set count correctly so we free the proper amount. */ |
1004 | entry->buf_count = count; |
1005 | entry->seg_count = count; |
1006 | drm_cleanup_buf_error(dev, entry); |
1007 | kfree(objp: temp_pagelist); |
1008 | mutex_unlock(lock: &dev->struct_mutex); |
1009 | atomic_dec(v: &dev->buf_alloc); |
1010 | return -ENOMEM; |
1011 | } |
1012 | entry->seglist[entry->seg_count++] = dmah; |
1013 | for (i = 0; i < (1 << page_order); i++) { |
1014 | DRM_DEBUG("page %d @ 0x%08lx\n" , |
1015 | dma->page_count + page_count, |
1016 | (unsigned long)dmah->vaddr + PAGE_SIZE * i); |
1017 | temp_pagelist[dma->page_count + page_count++] |
1018 | = (unsigned long)dmah->vaddr + PAGE_SIZE * i; |
1019 | } |
1020 | for (offset = 0; |
1021 | offset + size <= total && entry->buf_count < count; |
1022 | offset += alignment, ++entry->buf_count) { |
1023 | buf = &entry->buflist[entry->buf_count]; |
1024 | buf->idx = dma->buf_count + entry->buf_count; |
1025 | buf->total = alignment; |
1026 | buf->order = order; |
1027 | buf->used = 0; |
1028 | buf->offset = (dma->byte_count + byte_count + offset); |
1029 | buf->address = (void *)(dmah->vaddr + offset); |
1030 | buf->bus_address = dmah->busaddr + offset; |
1031 | buf->next = NULL; |
1032 | buf->waiting = 0; |
1033 | buf->pending = 0; |
1034 | buf->file_priv = NULL; |
1035 | |
1036 | buf->dev_priv_size = dev->driver->dev_priv_size; |
1037 | buf->dev_private = kzalloc(size: buf->dev_priv_size, |
1038 | GFP_KERNEL); |
1039 | if (!buf->dev_private) { |
1040 | /* Set count correctly so we free the proper amount. */ |
1041 | entry->buf_count = count; |
1042 | entry->seg_count = count; |
1043 | drm_cleanup_buf_error(dev, entry); |
1044 | kfree(objp: temp_pagelist); |
1045 | mutex_unlock(lock: &dev->struct_mutex); |
1046 | atomic_dec(v: &dev->buf_alloc); |
1047 | return -ENOMEM; |
1048 | } |
1049 | |
1050 | DRM_DEBUG("buffer %d @ %p\n" , |
1051 | entry->buf_count, buf->address); |
1052 | } |
1053 | byte_count += PAGE_SIZE << page_order; |
1054 | } |
1055 | |
1056 | temp_buflist = krealloc(objp: dma->buflist, |
1057 | new_size: (dma->buf_count + entry->buf_count) * |
1058 | sizeof(*dma->buflist), GFP_KERNEL); |
1059 | if (!temp_buflist) { |
1060 | /* Free the entry because it isn't valid */ |
1061 | drm_cleanup_buf_error(dev, entry); |
1062 | kfree(objp: temp_pagelist); |
1063 | mutex_unlock(lock: &dev->struct_mutex); |
1064 | atomic_dec(v: &dev->buf_alloc); |
1065 | return -ENOMEM; |
1066 | } |
1067 | dma->buflist = temp_buflist; |
1068 | |
1069 | for (i = 0; i < entry->buf_count; i++) { |
1070 | dma->buflist[i + dma->buf_count] = &entry->buflist[i]; |
1071 | } |
1072 | |
1073 | /* No allocations failed, so now we can replace the original pagelist |
1074 | * with the new one. |
1075 | */ |
1076 | if (dma->page_count) { |
1077 | kfree(objp: dma->pagelist); |
1078 | } |
1079 | dma->pagelist = temp_pagelist; |
1080 | |
1081 | dma->buf_count += entry->buf_count; |
1082 | dma->seg_count += entry->seg_count; |
1083 | dma->page_count += entry->seg_count << page_order; |
1084 | dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order); |
1085 | |
1086 | mutex_unlock(lock: &dev->struct_mutex); |
1087 | |
1088 | request->count = entry->buf_count; |
1089 | request->size = size; |
1090 | |
1091 | if (request->flags & _DRM_PCI_BUFFER_RO) |
1092 | dma->flags = _DRM_DMA_USE_PCI_RO; |
1093 | |
1094 | atomic_dec(v: &dev->buf_alloc); |
1095 | return 0; |
1096 | |
1097 | } |
1098 | EXPORT_SYMBOL(drm_legacy_addbufs_pci); |
1099 | |
1100 | static int drm_legacy_addbufs_sg(struct drm_device *dev, |
1101 | struct drm_buf_desc *request) |
1102 | { |
1103 | struct drm_device_dma *dma = dev->dma; |
1104 | struct drm_buf_entry *entry; |
1105 | struct drm_buf *buf; |
1106 | unsigned long offset; |
1107 | unsigned long agp_offset; |
1108 | int count; |
1109 | int order; |
1110 | int size; |
1111 | int alignment; |
1112 | int page_order; |
1113 | int total; |
1114 | int byte_count; |
1115 | int i; |
1116 | struct drm_buf **temp_buflist; |
1117 | |
1118 | if (!drm_core_check_feature(dev, feature: DRIVER_SG)) |
1119 | return -EOPNOTSUPP; |
1120 | |
1121 | if (!dma) |
1122 | return -EINVAL; |
1123 | |
1124 | if (!capable(CAP_SYS_ADMIN)) |
1125 | return -EPERM; |
1126 | |
1127 | count = request->count; |
1128 | order = order_base_2(request->size); |
1129 | size = 1 << order; |
1130 | |
1131 | alignment = (request->flags & _DRM_PAGE_ALIGN) |
1132 | ? PAGE_ALIGN(size) : size; |
1133 | page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; |
1134 | total = PAGE_SIZE << page_order; |
1135 | |
1136 | byte_count = 0; |
1137 | agp_offset = request->agp_start; |
1138 | |
1139 | DRM_DEBUG("count: %d\n" , count); |
1140 | DRM_DEBUG("order: %d\n" , order); |
1141 | DRM_DEBUG("size: %d\n" , size); |
1142 | DRM_DEBUG("agp_offset: %lu\n" , agp_offset); |
1143 | DRM_DEBUG("alignment: %d\n" , alignment); |
1144 | DRM_DEBUG("page_order: %d\n" , page_order); |
1145 | DRM_DEBUG("total: %d\n" , total); |
1146 | |
1147 | if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) |
1148 | return -EINVAL; |
1149 | |
1150 | spin_lock(lock: &dev->buf_lock); |
1151 | if (dev->buf_use) { |
1152 | spin_unlock(lock: &dev->buf_lock); |
1153 | return -EBUSY; |
1154 | } |
1155 | atomic_inc(v: &dev->buf_alloc); |
1156 | spin_unlock(lock: &dev->buf_lock); |
1157 | |
1158 | mutex_lock(&dev->struct_mutex); |
1159 | entry = &dma->bufs[order]; |
1160 | if (entry->buf_count) { |
1161 | mutex_unlock(lock: &dev->struct_mutex); |
1162 | atomic_dec(v: &dev->buf_alloc); |
1163 | return -ENOMEM; /* May only call once for each order */ |
1164 | } |
1165 | |
1166 | if (count < 0 || count > 4096) { |
1167 | mutex_unlock(lock: &dev->struct_mutex); |
1168 | atomic_dec(v: &dev->buf_alloc); |
1169 | return -EINVAL; |
1170 | } |
1171 | |
1172 | entry->buflist = kcalloc(n: count, size: sizeof(*entry->buflist), GFP_KERNEL); |
1173 | if (!entry->buflist) { |
1174 | mutex_unlock(lock: &dev->struct_mutex); |
1175 | atomic_dec(v: &dev->buf_alloc); |
1176 | return -ENOMEM; |
1177 | } |
1178 | |
1179 | entry->buf_size = size; |
1180 | entry->page_order = page_order; |
1181 | |
1182 | offset = 0; |
1183 | |
1184 | while (entry->buf_count < count) { |
1185 | buf = &entry->buflist[entry->buf_count]; |
1186 | buf->idx = dma->buf_count + entry->buf_count; |
1187 | buf->total = alignment; |
1188 | buf->order = order; |
1189 | buf->used = 0; |
1190 | |
1191 | buf->offset = (dma->byte_count + offset); |
1192 | buf->bus_address = agp_offset + offset; |
1193 | buf->address = (void *)(agp_offset + offset |
1194 | + (unsigned long)dev->sg->virtual); |
1195 | buf->next = NULL; |
1196 | buf->waiting = 0; |
1197 | buf->pending = 0; |
1198 | buf->file_priv = NULL; |
1199 | |
1200 | buf->dev_priv_size = dev->driver->dev_priv_size; |
1201 | buf->dev_private = kzalloc(size: buf->dev_priv_size, GFP_KERNEL); |
1202 | if (!buf->dev_private) { |
1203 | /* Set count correctly so we free the proper amount. */ |
1204 | entry->buf_count = count; |
1205 | drm_cleanup_buf_error(dev, entry); |
1206 | mutex_unlock(lock: &dev->struct_mutex); |
1207 | atomic_dec(v: &dev->buf_alloc); |
1208 | return -ENOMEM; |
1209 | } |
1210 | |
1211 | DRM_DEBUG("buffer %d @ %p\n" , entry->buf_count, buf->address); |
1212 | |
1213 | offset += alignment; |
1214 | entry->buf_count++; |
1215 | byte_count += PAGE_SIZE << page_order; |
1216 | } |
1217 | |
1218 | DRM_DEBUG("byte_count: %d\n" , byte_count); |
1219 | |
1220 | temp_buflist = krealloc(objp: dma->buflist, |
1221 | new_size: (dma->buf_count + entry->buf_count) * |
1222 | sizeof(*dma->buflist), GFP_KERNEL); |
1223 | if (!temp_buflist) { |
1224 | /* Free the entry because it isn't valid */ |
1225 | drm_cleanup_buf_error(dev, entry); |
1226 | mutex_unlock(lock: &dev->struct_mutex); |
1227 | atomic_dec(v: &dev->buf_alloc); |
1228 | return -ENOMEM; |
1229 | } |
1230 | dma->buflist = temp_buflist; |
1231 | |
1232 | for (i = 0; i < entry->buf_count; i++) { |
1233 | dma->buflist[i + dma->buf_count] = &entry->buflist[i]; |
1234 | } |
1235 | |
1236 | dma->buf_count += entry->buf_count; |
1237 | dma->seg_count += entry->seg_count; |
1238 | dma->page_count += byte_count >> PAGE_SHIFT; |
1239 | dma->byte_count += byte_count; |
1240 | |
1241 | DRM_DEBUG("dma->buf_count : %d\n" , dma->buf_count); |
1242 | DRM_DEBUG("entry->buf_count : %d\n" , entry->buf_count); |
1243 | |
1244 | mutex_unlock(lock: &dev->struct_mutex); |
1245 | |
1246 | request->count = entry->buf_count; |
1247 | request->size = size; |
1248 | |
1249 | dma->flags = _DRM_DMA_USE_SG; |
1250 | |
1251 | atomic_dec(v: &dev->buf_alloc); |
1252 | return 0; |
1253 | } |
1254 | |
1255 | /* |
1256 | * Add buffers for DMA transfers (ioctl). |
1257 | * |
1258 | * \param inode device inode. |
1259 | * \param file_priv DRM file private. |
1260 | * \param cmd command. |
1261 | * \param arg pointer to a struct drm_buf_desc request. |
1262 | * \return zero on success or a negative number on failure. |
1263 | * |
1264 | * According with the memory type specified in drm_buf_desc::flags and the |
1265 | * build options, it dispatches the call either to addbufs_agp(), |
1266 | * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent |
1267 | * PCI memory respectively. |
1268 | */ |
1269 | int drm_legacy_addbufs(struct drm_device *dev, void *data, |
1270 | struct drm_file *file_priv) |
1271 | { |
1272 | struct drm_buf_desc *request = data; |
1273 | int ret; |
1274 | |
1275 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
1276 | return -EOPNOTSUPP; |
1277 | |
1278 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA)) |
1279 | return -EOPNOTSUPP; |
1280 | |
1281 | #if IS_ENABLED(CONFIG_AGP) |
1282 | if (request->flags & _DRM_AGP_BUFFER) |
1283 | ret = drm_legacy_addbufs_agp(dev, request); |
1284 | else |
1285 | #endif |
1286 | if (request->flags & _DRM_SG_BUFFER) |
1287 | ret = drm_legacy_addbufs_sg(dev, request); |
1288 | else if (request->flags & _DRM_FB_BUFFER) |
1289 | ret = -EINVAL; |
1290 | else |
1291 | ret = drm_legacy_addbufs_pci(dev, request); |
1292 | |
1293 | return ret; |
1294 | } |
1295 | |
1296 | /* |
1297 | * Get information about the buffer mappings. |
1298 | * |
1299 | * This was originally mean for debugging purposes, or by a sophisticated |
1300 | * client library to determine how best to use the available buffers (e.g., |
1301 | * large buffers can be used for image transfer). |
1302 | * |
1303 | * \param inode device inode. |
1304 | * \param file_priv DRM file private. |
1305 | * \param cmd command. |
1306 | * \param arg pointer to a drm_buf_info structure. |
1307 | * \return zero on success or a negative number on failure. |
1308 | * |
1309 | * Increments drm_device::buf_use while holding the drm_device::buf_lock |
1310 | * lock, preventing of allocating more buffers after this call. Information |
1311 | * about each requested buffer is then copied into user space. |
1312 | */ |
1313 | int __drm_legacy_infobufs(struct drm_device *dev, |
1314 | void *data, int *p, |
1315 | int (*f)(void *, int, struct drm_buf_entry *)) |
1316 | { |
1317 | struct drm_device_dma *dma = dev->dma; |
1318 | int i; |
1319 | int count; |
1320 | |
1321 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
1322 | return -EOPNOTSUPP; |
1323 | |
1324 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA)) |
1325 | return -EOPNOTSUPP; |
1326 | |
1327 | if (!dma) |
1328 | return -EINVAL; |
1329 | |
1330 | spin_lock(lock: &dev->buf_lock); |
1331 | if (atomic_read(v: &dev->buf_alloc)) { |
1332 | spin_unlock(lock: &dev->buf_lock); |
1333 | return -EBUSY; |
1334 | } |
1335 | ++dev->buf_use; /* Can't allocate more after this call */ |
1336 | spin_unlock(lock: &dev->buf_lock); |
1337 | |
1338 | for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { |
1339 | if (dma->bufs[i].buf_count) |
1340 | ++count; |
1341 | } |
1342 | |
1343 | DRM_DEBUG("count = %d\n" , count); |
1344 | |
1345 | if (*p >= count) { |
1346 | for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { |
1347 | struct drm_buf_entry *from = &dma->bufs[i]; |
1348 | |
1349 | if (from->buf_count) { |
1350 | if (f(data, count, from) < 0) |
1351 | return -EFAULT; |
1352 | DRM_DEBUG("%d %d %d %d %d\n" , |
1353 | i, |
1354 | dma->bufs[i].buf_count, |
1355 | dma->bufs[i].buf_size, |
1356 | dma->bufs[i].low_mark, |
1357 | dma->bufs[i].high_mark); |
1358 | ++count; |
1359 | } |
1360 | } |
1361 | } |
1362 | *p = count; |
1363 | |
1364 | return 0; |
1365 | } |
1366 | |
1367 | static int copy_one_buf(void *data, int count, struct drm_buf_entry *from) |
1368 | { |
1369 | struct drm_buf_info *request = data; |
1370 | struct drm_buf_desc __user *to = &request->list[count]; |
1371 | struct drm_buf_desc v = {.count = from->buf_count, |
1372 | .size = from->buf_size, |
1373 | .low_mark = from->low_mark, |
1374 | .high_mark = from->high_mark}; |
1375 | |
1376 | if (copy_to_user(to, from: &v, offsetof(struct drm_buf_desc, flags))) |
1377 | return -EFAULT; |
1378 | return 0; |
1379 | } |
1380 | |
1381 | int drm_legacy_infobufs(struct drm_device *dev, void *data, |
1382 | struct drm_file *file_priv) |
1383 | { |
1384 | struct drm_buf_info *request = data; |
1385 | |
1386 | return __drm_legacy_infobufs(dev, data, p: &request->count, f: copy_one_buf); |
1387 | } |
1388 | |
1389 | /* |
1390 | * Specifies a low and high water mark for buffer allocation |
1391 | * |
1392 | * \param inode device inode. |
1393 | * \param file_priv DRM file private. |
1394 | * \param cmd command. |
1395 | * \param arg a pointer to a drm_buf_desc structure. |
1396 | * \return zero on success or a negative number on failure. |
1397 | * |
1398 | * Verifies that the size order is bounded between the admissible orders and |
1399 | * updates the respective drm_device_dma::bufs entry low and high water mark. |
1400 | * |
1401 | * \note This ioctl is deprecated and mostly never used. |
1402 | */ |
1403 | int drm_legacy_markbufs(struct drm_device *dev, void *data, |
1404 | struct drm_file *file_priv) |
1405 | { |
1406 | struct drm_device_dma *dma = dev->dma; |
1407 | struct drm_buf_desc *request = data; |
1408 | int order; |
1409 | struct drm_buf_entry *entry; |
1410 | |
1411 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
1412 | return -EOPNOTSUPP; |
1413 | |
1414 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA)) |
1415 | return -EOPNOTSUPP; |
1416 | |
1417 | if (!dma) |
1418 | return -EINVAL; |
1419 | |
1420 | DRM_DEBUG("%d, %d, %d\n" , |
1421 | request->size, request->low_mark, request->high_mark); |
1422 | order = order_base_2(request->size); |
1423 | if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) |
1424 | return -EINVAL; |
1425 | entry = &dma->bufs[order]; |
1426 | |
1427 | if (request->low_mark < 0 || request->low_mark > entry->buf_count) |
1428 | return -EINVAL; |
1429 | if (request->high_mark < 0 || request->high_mark > entry->buf_count) |
1430 | return -EINVAL; |
1431 | |
1432 | entry->low_mark = request->low_mark; |
1433 | entry->high_mark = request->high_mark; |
1434 | |
1435 | return 0; |
1436 | } |
1437 | |
1438 | /* |
1439 | * Unreserve the buffers in list, previously reserved using drmDMA. |
1440 | * |
1441 | * \param inode device inode. |
1442 | * \param file_priv DRM file private. |
1443 | * \param cmd command. |
1444 | * \param arg pointer to a drm_buf_free structure. |
1445 | * \return zero on success or a negative number on failure. |
1446 | * |
1447 | * Calls free_buffer() for each used buffer. |
1448 | * This function is primarily used for debugging. |
1449 | */ |
1450 | int drm_legacy_freebufs(struct drm_device *dev, void *data, |
1451 | struct drm_file *file_priv) |
1452 | { |
1453 | struct drm_device_dma *dma = dev->dma; |
1454 | struct drm_buf_free *request = data; |
1455 | int i; |
1456 | int idx; |
1457 | struct drm_buf *buf; |
1458 | |
1459 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
1460 | return -EOPNOTSUPP; |
1461 | |
1462 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA)) |
1463 | return -EOPNOTSUPP; |
1464 | |
1465 | if (!dma) |
1466 | return -EINVAL; |
1467 | |
1468 | DRM_DEBUG("%d\n" , request->count); |
1469 | for (i = 0; i < request->count; i++) { |
1470 | if (copy_from_user(to: &idx, from: &request->list[i], n: sizeof(idx))) |
1471 | return -EFAULT; |
1472 | if (idx < 0 || idx >= dma->buf_count) { |
1473 | DRM_ERROR("Index %d (of %d max)\n" , |
1474 | idx, dma->buf_count - 1); |
1475 | return -EINVAL; |
1476 | } |
1477 | idx = array_index_nospec(idx, dma->buf_count); |
1478 | buf = dma->buflist[idx]; |
1479 | if (buf->file_priv != file_priv) { |
1480 | DRM_ERROR("Process %d freeing buffer not owned\n" , |
1481 | task_pid_nr(current)); |
1482 | return -EINVAL; |
1483 | } |
1484 | drm_legacy_free_buffer(dev, buf); |
1485 | } |
1486 | |
1487 | return 0; |
1488 | } |
1489 | |
1490 | /* |
1491 | * Maps all of the DMA buffers into client-virtual space (ioctl). |
1492 | * |
1493 | * \param inode device inode. |
1494 | * \param file_priv DRM file private. |
1495 | * \param cmd command. |
1496 | * \param arg pointer to a drm_buf_map structure. |
1497 | * \return zero on success or a negative number on failure. |
1498 | * |
1499 | * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information |
1500 | * about each buffer into user space. For PCI buffers, it calls vm_mmap() with |
1501 | * offset equal to 0, which drm_mmap() interprets as PCI buffers and calls |
1502 | * drm_mmap_dma(). |
1503 | */ |
1504 | int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p, |
1505 | void __user **v, |
1506 | int (*f)(void *, int, unsigned long, |
1507 | struct drm_buf *), |
1508 | struct drm_file *file_priv) |
1509 | { |
1510 | struct drm_device_dma *dma = dev->dma; |
1511 | int retcode = 0; |
1512 | unsigned long virtual; |
1513 | int i; |
1514 | |
1515 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
1516 | return -EOPNOTSUPP; |
1517 | |
1518 | if (!drm_core_check_feature(dev, feature: DRIVER_HAVE_DMA)) |
1519 | return -EOPNOTSUPP; |
1520 | |
1521 | if (!dma) |
1522 | return -EINVAL; |
1523 | |
1524 | spin_lock(lock: &dev->buf_lock); |
1525 | if (atomic_read(v: &dev->buf_alloc)) { |
1526 | spin_unlock(lock: &dev->buf_lock); |
1527 | return -EBUSY; |
1528 | } |
1529 | dev->buf_use++; /* Can't allocate more after this call */ |
1530 | spin_unlock(lock: &dev->buf_lock); |
1531 | |
1532 | if (*p >= dma->buf_count) { |
1533 | if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP)) |
1534 | || (drm_core_check_feature(dev, feature: DRIVER_SG) |
1535 | && (dma->flags & _DRM_DMA_USE_SG))) { |
1536 | struct drm_local_map *map = dev->agp_buffer_map; |
1537 | unsigned long token = dev->agp_buffer_token; |
1538 | |
1539 | if (!map) { |
1540 | retcode = -EINVAL; |
1541 | goto done; |
1542 | } |
1543 | virtual = vm_mmap(file_priv->filp, 0, map->size, |
1544 | PROT_READ | PROT_WRITE, |
1545 | MAP_SHARED, |
1546 | token); |
1547 | } else { |
1548 | virtual = vm_mmap(file_priv->filp, 0, dma->byte_count, |
1549 | PROT_READ | PROT_WRITE, |
1550 | MAP_SHARED, 0); |
1551 | } |
1552 | if (virtual > -1024UL) { |
1553 | /* Real error */ |
1554 | retcode = (signed long)virtual; |
1555 | goto done; |
1556 | } |
1557 | *v = (void __user *)virtual; |
1558 | |
1559 | for (i = 0; i < dma->buf_count; i++) { |
1560 | if (f(data, i, virtual, dma->buflist[i]) < 0) { |
1561 | retcode = -EFAULT; |
1562 | goto done; |
1563 | } |
1564 | } |
1565 | } |
1566 | done: |
1567 | *p = dma->buf_count; |
1568 | DRM_DEBUG("%d buffers, retcode = %d\n" , *p, retcode); |
1569 | |
1570 | return retcode; |
1571 | } |
1572 | |
1573 | static int map_one_buf(void *data, int idx, unsigned long virtual, |
1574 | struct drm_buf *buf) |
1575 | { |
1576 | struct drm_buf_map *request = data; |
1577 | unsigned long address = virtual + buf->offset; /* *** */ |
1578 | |
1579 | if (copy_to_user(to: &request->list[idx].idx, from: &buf->idx, |
1580 | n: sizeof(request->list[0].idx))) |
1581 | return -EFAULT; |
1582 | if (copy_to_user(to: &request->list[idx].total, from: &buf->total, |
1583 | n: sizeof(request->list[0].total))) |
1584 | return -EFAULT; |
1585 | if (clear_user(to: &request->list[idx].used, n: sizeof(int))) |
1586 | return -EFAULT; |
1587 | if (copy_to_user(to: &request->list[idx].address, from: &address, |
1588 | n: sizeof(address))) |
1589 | return -EFAULT; |
1590 | return 0; |
1591 | } |
1592 | |
1593 | int drm_legacy_mapbufs(struct drm_device *dev, void *data, |
1594 | struct drm_file *file_priv) |
1595 | { |
1596 | struct drm_buf_map *request = data; |
1597 | |
1598 | return __drm_legacy_mapbufs(dev, data, p: &request->count, |
1599 | v: &request->virtual, f: map_one_buf, |
1600 | file_priv); |
1601 | } |
1602 | |
1603 | int drm_legacy_dma_ioctl(struct drm_device *dev, void *data, |
1604 | struct drm_file *file_priv) |
1605 | { |
1606 | if (!drm_core_check_feature(dev, feature: DRIVER_LEGACY)) |
1607 | return -EOPNOTSUPP; |
1608 | |
1609 | if (dev->driver->dma_ioctl) |
1610 | return dev->driver->dma_ioctl(dev, data, file_priv); |
1611 | else |
1612 | return -EINVAL; |
1613 | } |
1614 | |
1615 | struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev) |
1616 | { |
1617 | struct drm_map_list *entry; |
1618 | |
1619 | list_for_each_entry(entry, &dev->maplist, head) { |
1620 | if (entry->map && entry->map->type == _DRM_SHM && |
1621 | (entry->map->flags & _DRM_CONTAINS_LOCK)) { |
1622 | return entry->map; |
1623 | } |
1624 | } |
1625 | return NULL; |
1626 | } |
1627 | EXPORT_SYMBOL(drm_legacy_getsarea); |
1628 | |