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_agpsupport.h>
44 #include <drm/drm_device.h>
45 #include <drm/drm_drv.h>
46 #include <drm/drm_file.h>
47 #include <drm/drm_print.h>
48
49 #include "drm_legacy.h"
50
51
drm_find_matching_map(struct drm_device * dev,struct drm_local_map * map)52 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
53 struct drm_local_map *map)
54 {
55 struct drm_map_list *entry;
56
57 list_for_each_entry(entry, &dev->maplist, head) {
58 /*
59 * Because the kernel-userspace ABI is fixed at a 32-bit offset
60 * while PCI resources may live above that, we only compare the
61 * lower 32 bits of the map offset for maps of type
62 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
63 * It is assumed that if a driver have more than one resource
64 * of each type, the lower 32 bits are different.
65 */
66 if (!entry->map ||
67 map->type != entry->map->type ||
68 entry->master != dev->master)
69 continue;
70 switch (map->type) {
71 case _DRM_SHM:
72 if (map->flags != _DRM_CONTAINS_LOCK)
73 break;
74 return entry;
75 case _DRM_REGISTERS:
76 case _DRM_FRAME_BUFFER:
77 if ((entry->map->offset & 0xffffffff) ==
78 (map->offset & 0xffffffff))
79 return entry;
80 default: /* Make gcc happy */
81 ;
82 }
83 if (entry->map->offset == map->offset)
84 return entry;
85 }
86
87 return NULL;
88 }
89
drm_map_handle(struct drm_device * dev,struct drm_hash_item * hash,unsigned long user_token,int hashed_handle,int shm)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(&dev->map_hash, 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(&dev->map_hash, hash,
135 user_token, 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 */
drm_addmap_core(struct drm_device * dev,resource_size_t offset,unsigned int size,enum drm_map_type type,enum drm_map_flags flags,struct drm_map_list ** maplist)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(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(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(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(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(map->offset, map->size);
224 }
225 if (map->type == _DRM_REGISTERS) {
226 if (map->flags & _DRM_WRITE_COMBINING)
227 map->handle = ioremap_wc(map->offset,
228 map->size);
229 else
230 map->handle = ioremap(map->offset, map->size);
231 if (!map->handle) {
232 kfree(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(map);
249 *maplist = list;
250 return 0;
251 }
252 map->handle = vmalloc_user(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(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(map->handle);
264 kfree(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(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(&dev->agp->memory) && !valid) {
308 kfree(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(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 map->handle = dma_alloc_coherent(&dev->pdev->dev,
329 map->size,
330 &map->offset,
331 GFP_KERNEL);
332 if (!map->handle) {
333 kfree(map);
334 return -ENOMEM;
335 }
336 break;
337 default:
338 kfree(map);
339 return -EINVAL;
340 }
341
342 list = kzalloc(sizeof(*list), GFP_KERNEL);
343 if (!list) {
344 if (map->type == _DRM_REGISTERS)
345 iounmap(map->handle);
346 kfree(map);
347 return -EINVAL;
348 }
349 list->map = map;
350
351 mutex_lock(&dev->struct_mutex);
352 list_add(&list->head, &dev->maplist);
353
354 /* Assign a 32-bit handle */
355 /* We do it here so that dev->struct_mutex protects the increment */
356 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
357 map->offset;
358 ret = drm_map_handle(dev, &list->hash, user_token, 0,
359 (map->type == _DRM_SHM));
360 if (ret) {
361 if (map->type == _DRM_REGISTERS)
362 iounmap(map->handle);
363 kfree(map);
364 kfree(list);
365 mutex_unlock(&dev->struct_mutex);
366 return ret;
367 }
368
369 list->user_token = list->hash.key << PAGE_SHIFT;
370 mutex_unlock(&dev->struct_mutex);
371
372 if (!(map->flags & _DRM_DRIVER))
373 list->master = dev->master;
374 *maplist = list;
375 return 0;
376 }
377
drm_legacy_addmap(struct drm_device * dev,resource_size_t offset,unsigned int size,enum drm_map_type type,enum drm_map_flags flags,struct drm_local_map ** map_ptr)378 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
379 unsigned int size, enum drm_map_type type,
380 enum drm_map_flags flags, struct drm_local_map **map_ptr)
381 {
382 struct drm_map_list *list;
383 int rc;
384
385 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
386 if (!rc)
387 *map_ptr = list->map;
388 return rc;
389 }
390 EXPORT_SYMBOL(drm_legacy_addmap);
391
drm_legacy_findmap(struct drm_device * dev,unsigned int token)392 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
393 unsigned int token)
394 {
395 struct drm_map_list *_entry;
396
397 list_for_each_entry(_entry, &dev->maplist, head)
398 if (_entry->user_token == token)
399 return _entry->map;
400 return NULL;
401 }
402 EXPORT_SYMBOL(drm_legacy_findmap);
403
404 /*
405 * Ioctl to specify a range of memory that is available for mapping by a
406 * non-root process.
407 *
408 * \param inode device inode.
409 * \param file_priv DRM file private.
410 * \param cmd command.
411 * \param arg pointer to a drm_map structure.
412 * \return zero on success or a negative value on error.
413 *
414 */
drm_legacy_addmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)415 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
416 struct drm_file *file_priv)
417 {
418 struct drm_map *map = data;
419 struct drm_map_list *maplist;
420 int err;
421
422 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
423 return -EPERM;
424
425 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
426 !drm_core_check_feature(dev, DRIVER_LEGACY))
427 return -EOPNOTSUPP;
428
429 err = drm_addmap_core(dev, map->offset, map->size, map->type,
430 map->flags, &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 */
drm_legacy_getmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)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, DRIVER_KMS_LEGACY_CONTEXT) &&
472 !drm_core_check_feature(dev, DRIVER_LEGACY))
473 return -EOPNOTSUPP;
474
475 idx = map->offset;
476 if (idx < 0)
477 return -EINVAL;
478
479 i = 0;
480 mutex_lock(&dev->struct_mutex);
481 list_for_each(list, &dev->maplist) {
482 if (i == idx) {
483 r_list = list_entry(list, struct drm_map_list, head);
484 break;
485 }
486 i++;
487 }
488 if (!r_list || !r_list->map) {
489 mutex_unlock(&dev->struct_mutex);
490 return -EINVAL;
491 }
492
493 map->offset = r_list->map->offset;
494 map->size = r_list->map->size;
495 map->type = r_list->map->type;
496 map->flags = r_list->map->flags;
497 map->handle = (void *)(unsigned long) r_list->user_token;
498 map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
499
500 mutex_unlock(&dev->struct_mutex);
501
502 return 0;
503 }
504
505 /*
506 * Remove a map private from list and deallocate resources if the mapping
507 * isn't in use.
508 *
509 * Searches the map on drm_device::maplist, removes it from the list, see if
510 * it's being used, and free any associated resource (such as MTRR's) if it's not
511 * being on use.
512 *
513 * \sa drm_legacy_addmap
514 */
drm_legacy_rmmap_locked(struct drm_device * dev,struct drm_local_map * map)515 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
516 {
517 struct drm_map_list *r_list = NULL, *list_t;
518 int found = 0;
519 struct drm_master *master;
520
521 /* Find the list entry for the map and remove it */
522 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
523 if (r_list->map == map) {
524 master = r_list->master;
525 list_del(&r_list->head);
526 drm_ht_remove_key(&dev->map_hash,
527 r_list->user_token >> PAGE_SHIFT);
528 kfree(r_list);
529 found = 1;
530 break;
531 }
532 }
533
534 if (!found)
535 return -EINVAL;
536
537 switch (map->type) {
538 case _DRM_REGISTERS:
539 iounmap(map->handle);
540 fallthrough;
541 case _DRM_FRAME_BUFFER:
542 arch_phys_wc_del(map->mtrr);
543 break;
544 case _DRM_SHM:
545 vfree(map->handle);
546 if (master) {
547 if (dev->sigdata.lock == master->lock.hw_lock)
548 dev->sigdata.lock = NULL;
549 master->lock.hw_lock = NULL; /* SHM removed */
550 master->lock.file_priv = NULL;
551 wake_up_interruptible_all(&master->lock.lock_queue);
552 }
553 break;
554 case _DRM_AGP:
555 case _DRM_SCATTER_GATHER:
556 break;
557 case _DRM_CONSISTENT:
558 dma_free_coherent(&dev->pdev->dev,
559 map->size,
560 map->handle,
561 map->offset);
562 break;
563 }
564 kfree(map);
565
566 return 0;
567 }
568 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
569
drm_legacy_rmmap(struct drm_device * dev,struct drm_local_map * map)570 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
571 {
572 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
573 !drm_core_check_feature(dev, DRIVER_LEGACY))
574 return;
575
576 mutex_lock(&dev->struct_mutex);
577 drm_legacy_rmmap_locked(dev, map);
578 mutex_unlock(&dev->struct_mutex);
579 }
580 EXPORT_SYMBOL(drm_legacy_rmmap);
581
drm_legacy_master_rmmaps(struct drm_device * dev,struct drm_master * master)582 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
583 {
584 struct drm_map_list *r_list, *list_temp;
585
586 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
587 return;
588
589 mutex_lock(&dev->struct_mutex);
590 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
591 if (r_list->master == master) {
592 drm_legacy_rmmap_locked(dev, r_list->map);
593 r_list = NULL;
594 }
595 }
596 mutex_unlock(&dev->struct_mutex);
597 }
598
drm_legacy_rmmaps(struct drm_device * dev)599 void drm_legacy_rmmaps(struct drm_device *dev)
600 {
601 struct drm_map_list *r_list, *list_temp;
602
603 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
604 drm_legacy_rmmap(dev, r_list->map);
605 }
606
607 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
608 * the last close of the device, and this is necessary for cleanup when things
609 * exit uncleanly. Therefore, having userland manually remove mappings seems
610 * like a pointless exercise since they're going away anyway.
611 *
612 * One use case might be after addmap is allowed for normal users for SHM and
613 * gets used by drivers that the server doesn't need to care about. This seems
614 * unlikely.
615 *
616 * \param inode device inode.
617 * \param file_priv DRM file private.
618 * \param cmd command.
619 * \param arg pointer to a struct drm_map structure.
620 * \return zero on success or a negative value on error.
621 */
drm_legacy_rmmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)622 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
623 struct drm_file *file_priv)
624 {
625 struct drm_map *request = data;
626 struct drm_local_map *map = NULL;
627 struct drm_map_list *r_list;
628 int ret;
629
630 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
631 !drm_core_check_feature(dev, DRIVER_LEGACY))
632 return -EOPNOTSUPP;
633
634 mutex_lock(&dev->struct_mutex);
635 list_for_each_entry(r_list, &dev->maplist, head) {
636 if (r_list->map &&
637 r_list->user_token == (unsigned long)request->handle &&
638 r_list->map->flags & _DRM_REMOVABLE) {
639 map = r_list->map;
640 break;
641 }
642 }
643
644 /* List has wrapped around to the head pointer, or it's empty we didn't
645 * find anything.
646 */
647 if (list_empty(&dev->maplist) || !map) {
648 mutex_unlock(&dev->struct_mutex);
649 return -EINVAL;
650 }
651
652 /* Register and framebuffer maps are permanent */
653 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
654 mutex_unlock(&dev->struct_mutex);
655 return 0;
656 }
657
658 ret = drm_legacy_rmmap_locked(dev, map);
659
660 mutex_unlock(&dev->struct_mutex);
661
662 return ret;
663 }
664
665 /*
666 * Cleanup after an error on one of the addbufs() functions.
667 *
668 * \param dev DRM device.
669 * \param entry buffer entry where the error occurred.
670 *
671 * Frees any pages and buffers associated with the given entry.
672 */
drm_cleanup_buf_error(struct drm_device * dev,struct drm_buf_entry * entry)673 static void drm_cleanup_buf_error(struct drm_device *dev,
674 struct drm_buf_entry *entry)
675 {
676 int i;
677
678 if (entry->seg_count) {
679 for (i = 0; i < entry->seg_count; i++) {
680 if (entry->seglist[i]) {
681 drm_pci_free(dev, entry->seglist[i]);
682 }
683 }
684 kfree(entry->seglist);
685
686 entry->seg_count = 0;
687 }
688
689 if (entry->buf_count) {
690 for (i = 0; i < entry->buf_count; i++) {
691 kfree(entry->buflist[i].dev_private);
692 }
693 kfree(entry->buflist);
694
695 entry->buf_count = 0;
696 }
697 }
698
699 #if IS_ENABLED(CONFIG_AGP)
700 /*
701 * Add AGP buffers for DMA transfers.
702 *
703 * \param dev struct drm_device to which the buffers are to be added.
704 * \param request pointer to a struct drm_buf_desc describing the request.
705 * \return zero on success or a negative number on failure.
706 *
707 * After some sanity checks creates a drm_buf structure for each buffer and
708 * reallocates the buffer list of the same size order to accommodate the new
709 * buffers.
710 */
drm_legacy_addbufs_agp(struct drm_device * dev,struct drm_buf_desc * request)711 int drm_legacy_addbufs_agp(struct drm_device *dev,
712 struct drm_buf_desc *request)
713 {
714 struct drm_device_dma *dma = dev->dma;
715 struct drm_buf_entry *entry;
716 struct drm_agp_mem *agp_entry;
717 struct drm_buf *buf;
718 unsigned long offset;
719 unsigned long agp_offset;
720 int count;
721 int order;
722 int size;
723 int alignment;
724 int page_order;
725 int total;
726 int byte_count;
727 int i, valid;
728 struct drm_buf **temp_buflist;
729
730 if (!dma)
731 return -EINVAL;
732
733 count = request->count;
734 order = order_base_2(request->size);
735 size = 1 << order;
736
737 alignment = (request->flags & _DRM_PAGE_ALIGN)
738 ? PAGE_ALIGN(size) : size;
739 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
740 total = PAGE_SIZE << page_order;
741
742 byte_count = 0;
743 agp_offset = dev->agp->base + request->agp_start;
744
745 DRM_DEBUG("count: %d\n", count);
746 DRM_DEBUG("order: %d\n", order);
747 DRM_DEBUG("size: %d\n", size);
748 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
749 DRM_DEBUG("alignment: %d\n", alignment);
750 DRM_DEBUG("page_order: %d\n", page_order);
751 DRM_DEBUG("total: %d\n", total);
752
753 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
754 return -EINVAL;
755
756 /* Make sure buffers are located in AGP memory that we own */
757 valid = 0;
758 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
759 if ((agp_offset >= agp_entry->bound) &&
760 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
761 valid = 1;
762 break;
763 }
764 }
765 if (!list_empty(&dev->agp->memory) && !valid) {
766 DRM_DEBUG("zone invalid\n");
767 return -EINVAL;
768 }
769 spin_lock(&dev->buf_lock);
770 if (dev->buf_use) {
771 spin_unlock(&dev->buf_lock);
772 return -EBUSY;
773 }
774 atomic_inc(&dev->buf_alloc);
775 spin_unlock(&dev->buf_lock);
776
777 mutex_lock(&dev->struct_mutex);
778 entry = &dma->bufs[order];
779 if (entry->buf_count) {
780 mutex_unlock(&dev->struct_mutex);
781 atomic_dec(&dev->buf_alloc);
782 return -ENOMEM; /* May only call once for each order */
783 }
784
785 if (count < 0 || count > 4096) {
786 mutex_unlock(&dev->struct_mutex);
787 atomic_dec(&dev->buf_alloc);
788 return -EINVAL;
789 }
790
791 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
792 if (!entry->buflist) {
793 mutex_unlock(&dev->struct_mutex);
794 atomic_dec(&dev->buf_alloc);
795 return -ENOMEM;
796 }
797
798 entry->buf_size = size;
799 entry->page_order = page_order;
800
801 offset = 0;
802
803 while (entry->buf_count < count) {
804 buf = &entry->buflist[entry->buf_count];
805 buf->idx = dma->buf_count + entry->buf_count;
806 buf->total = alignment;
807 buf->order = order;
808 buf->used = 0;
809
810 buf->offset = (dma->byte_count + offset);
811 buf->bus_address = agp_offset + offset;
812 buf->address = (void *)(agp_offset + offset);
813 buf->next = NULL;
814 buf->waiting = 0;
815 buf->pending = 0;
816 buf->file_priv = NULL;
817
818 buf->dev_priv_size = dev->driver->dev_priv_size;
819 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
820 if (!buf->dev_private) {
821 /* Set count correctly so we free the proper amount. */
822 entry->buf_count = count;
823 drm_cleanup_buf_error(dev, entry);
824 mutex_unlock(&dev->struct_mutex);
825 atomic_dec(&dev->buf_alloc);
826 return -ENOMEM;
827 }
828
829 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
830
831 offset += alignment;
832 entry->buf_count++;
833 byte_count += PAGE_SIZE << page_order;
834 }
835
836 DRM_DEBUG("byte_count: %d\n", byte_count);
837
838 temp_buflist = krealloc(dma->buflist,
839 (dma->buf_count + entry->buf_count) *
840 sizeof(*dma->buflist), GFP_KERNEL);
841 if (!temp_buflist) {
842 /* Free the entry because it isn't valid */
843 drm_cleanup_buf_error(dev, entry);
844 mutex_unlock(&dev->struct_mutex);
845 atomic_dec(&dev->buf_alloc);
846 return -ENOMEM;
847 }
848 dma->buflist = temp_buflist;
849
850 for (i = 0; i < entry->buf_count; i++) {
851 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
852 }
853
854 dma->buf_count += entry->buf_count;
855 dma->seg_count += entry->seg_count;
856 dma->page_count += byte_count >> PAGE_SHIFT;
857 dma->byte_count += byte_count;
858
859 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
860 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
861
862 mutex_unlock(&dev->struct_mutex);
863
864 request->count = entry->buf_count;
865 request->size = size;
866
867 dma->flags = _DRM_DMA_USE_AGP;
868
869 atomic_dec(&dev->buf_alloc);
870 return 0;
871 }
872 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
873 #endif /* CONFIG_AGP */
874
drm_legacy_addbufs_pci(struct drm_device * dev,struct drm_buf_desc * request)875 int drm_legacy_addbufs_pci(struct drm_device *dev,
876 struct drm_buf_desc *request)
877 {
878 struct drm_device_dma *dma = dev->dma;
879 int count;
880 int order;
881 int size;
882 int total;
883 int page_order;
884 struct drm_buf_entry *entry;
885 drm_dma_handle_t *dmah;
886 struct drm_buf *buf;
887 int alignment;
888 unsigned long offset;
889 int i;
890 int byte_count;
891 int page_count;
892 unsigned long *temp_pagelist;
893 struct drm_buf **temp_buflist;
894
895 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
896 return -EOPNOTSUPP;
897
898 if (!dma)
899 return -EINVAL;
900
901 if (!capable(CAP_SYS_ADMIN))
902 return -EPERM;
903
904 count = request->count;
905 order = order_base_2(request->size);
906 size = 1 << order;
907
908 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
909 request->count, request->size, size, order);
910
911 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
912 return -EINVAL;
913
914 alignment = (request->flags & _DRM_PAGE_ALIGN)
915 ? PAGE_ALIGN(size) : size;
916 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
917 total = PAGE_SIZE << page_order;
918
919 spin_lock(&dev->buf_lock);
920 if (dev->buf_use) {
921 spin_unlock(&dev->buf_lock);
922 return -EBUSY;
923 }
924 atomic_inc(&dev->buf_alloc);
925 spin_unlock(&dev->buf_lock);
926
927 mutex_lock(&dev->struct_mutex);
928 entry = &dma->bufs[order];
929 if (entry->buf_count) {
930 mutex_unlock(&dev->struct_mutex);
931 atomic_dec(&dev->buf_alloc);
932 return -ENOMEM; /* May only call once for each order */
933 }
934
935 if (count < 0 || count > 4096) {
936 mutex_unlock(&dev->struct_mutex);
937 atomic_dec(&dev->buf_alloc);
938 return -EINVAL;
939 }
940
941 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
942 if (!entry->buflist) {
943 mutex_unlock(&dev->struct_mutex);
944 atomic_dec(&dev->buf_alloc);
945 return -ENOMEM;
946 }
947
948 entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
949 if (!entry->seglist) {
950 kfree(entry->buflist);
951 mutex_unlock(&dev->struct_mutex);
952 atomic_dec(&dev->buf_alloc);
953 return -ENOMEM;
954 }
955
956 /* Keep the original pagelist until we know all the allocations
957 * have succeeded
958 */
959 temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
960 sizeof(*dma->pagelist),
961 GFP_KERNEL);
962 if (!temp_pagelist) {
963 kfree(entry->buflist);
964 kfree(entry->seglist);
965 mutex_unlock(&dev->struct_mutex);
966 atomic_dec(&dev->buf_alloc);
967 return -ENOMEM;
968 }
969 memcpy(temp_pagelist,
970 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
971 DRM_DEBUG("pagelist: %d entries\n",
972 dma->page_count + (count << page_order));
973
974 entry->buf_size = size;
975 entry->page_order = page_order;
976 byte_count = 0;
977 page_count = 0;
978
979 while (entry->buf_count < count) {
980
981 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
982
983 if (!dmah) {
984 /* Set count correctly so we free the proper amount. */
985 entry->buf_count = count;
986 entry->seg_count = count;
987 drm_cleanup_buf_error(dev, entry);
988 kfree(temp_pagelist);
989 mutex_unlock(&dev->struct_mutex);
990 atomic_dec(&dev->buf_alloc);
991 return -ENOMEM;
992 }
993 entry->seglist[entry->seg_count++] = dmah;
994 for (i = 0; i < (1 << page_order); i++) {
995 DRM_DEBUG("page %d @ 0x%08lx\n",
996 dma->page_count + page_count,
997 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
998 temp_pagelist[dma->page_count + page_count++]
999 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1000 }
1001 for (offset = 0;
1002 offset + size <= total && entry->buf_count < count;
1003 offset += alignment, ++entry->buf_count) {
1004 buf = &entry->buflist[entry->buf_count];
1005 buf->idx = dma->buf_count + entry->buf_count;
1006 buf->total = alignment;
1007 buf->order = order;
1008 buf->used = 0;
1009 buf->offset = (dma->byte_count + byte_count + offset);
1010 buf->address = (void *)(dmah->vaddr + offset);
1011 buf->bus_address = dmah->busaddr + offset;
1012 buf->next = NULL;
1013 buf->waiting = 0;
1014 buf->pending = 0;
1015 buf->file_priv = NULL;
1016
1017 buf->dev_priv_size = dev->driver->dev_priv_size;
1018 buf->dev_private = kzalloc(buf->dev_priv_size,
1019 GFP_KERNEL);
1020 if (!buf->dev_private) {
1021 /* Set count correctly so we free the proper amount. */
1022 entry->buf_count = count;
1023 entry->seg_count = count;
1024 drm_cleanup_buf_error(dev, entry);
1025 kfree(temp_pagelist);
1026 mutex_unlock(&dev->struct_mutex);
1027 atomic_dec(&dev->buf_alloc);
1028 return -ENOMEM;
1029 }
1030
1031 DRM_DEBUG("buffer %d @ %p\n",
1032 entry->buf_count, buf->address);
1033 }
1034 byte_count += PAGE_SIZE << page_order;
1035 }
1036
1037 temp_buflist = krealloc(dma->buflist,
1038 (dma->buf_count + entry->buf_count) *
1039 sizeof(*dma->buflist), GFP_KERNEL);
1040 if (!temp_buflist) {
1041 /* Free the entry because it isn't valid */
1042 drm_cleanup_buf_error(dev, entry);
1043 kfree(temp_pagelist);
1044 mutex_unlock(&dev->struct_mutex);
1045 atomic_dec(&dev->buf_alloc);
1046 return -ENOMEM;
1047 }
1048 dma->buflist = temp_buflist;
1049
1050 for (i = 0; i < entry->buf_count; i++) {
1051 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1052 }
1053
1054 /* No allocations failed, so now we can replace the original pagelist
1055 * with the new one.
1056 */
1057 if (dma->page_count) {
1058 kfree(dma->pagelist);
1059 }
1060 dma->pagelist = temp_pagelist;
1061
1062 dma->buf_count += entry->buf_count;
1063 dma->seg_count += entry->seg_count;
1064 dma->page_count += entry->seg_count << page_order;
1065 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1066
1067 mutex_unlock(&dev->struct_mutex);
1068
1069 request->count = entry->buf_count;
1070 request->size = size;
1071
1072 if (request->flags & _DRM_PCI_BUFFER_RO)
1073 dma->flags = _DRM_DMA_USE_PCI_RO;
1074
1075 atomic_dec(&dev->buf_alloc);
1076 return 0;
1077
1078 }
1079 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1080
drm_legacy_addbufs_sg(struct drm_device * dev,struct drm_buf_desc * request)1081 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1082 struct drm_buf_desc *request)
1083 {
1084 struct drm_device_dma *dma = dev->dma;
1085 struct drm_buf_entry *entry;
1086 struct drm_buf *buf;
1087 unsigned long offset;
1088 unsigned long agp_offset;
1089 int count;
1090 int order;
1091 int size;
1092 int alignment;
1093 int page_order;
1094 int total;
1095 int byte_count;
1096 int i;
1097 struct drm_buf **temp_buflist;
1098
1099 if (!drm_core_check_feature(dev, DRIVER_SG))
1100 return -EOPNOTSUPP;
1101
1102 if (!dma)
1103 return -EINVAL;
1104
1105 if (!capable(CAP_SYS_ADMIN))
1106 return -EPERM;
1107
1108 count = request->count;
1109 order = order_base_2(request->size);
1110 size = 1 << order;
1111
1112 alignment = (request->flags & _DRM_PAGE_ALIGN)
1113 ? PAGE_ALIGN(size) : size;
1114 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1115 total = PAGE_SIZE << page_order;
1116
1117 byte_count = 0;
1118 agp_offset = request->agp_start;
1119
1120 DRM_DEBUG("count: %d\n", count);
1121 DRM_DEBUG("order: %d\n", order);
1122 DRM_DEBUG("size: %d\n", size);
1123 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1124 DRM_DEBUG("alignment: %d\n", alignment);
1125 DRM_DEBUG("page_order: %d\n", page_order);
1126 DRM_DEBUG("total: %d\n", total);
1127
1128 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1129 return -EINVAL;
1130
1131 spin_lock(&dev->buf_lock);
1132 if (dev->buf_use) {
1133 spin_unlock(&dev->buf_lock);
1134 return -EBUSY;
1135 }
1136 atomic_inc(&dev->buf_alloc);
1137 spin_unlock(&dev->buf_lock);
1138
1139 mutex_lock(&dev->struct_mutex);
1140 entry = &dma->bufs[order];
1141 if (entry->buf_count) {
1142 mutex_unlock(&dev->struct_mutex);
1143 atomic_dec(&dev->buf_alloc);
1144 return -ENOMEM; /* May only call once for each order */
1145 }
1146
1147 if (count < 0 || count > 4096) {
1148 mutex_unlock(&dev->struct_mutex);
1149 atomic_dec(&dev->buf_alloc);
1150 return -EINVAL;
1151 }
1152
1153 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1154 if (!entry->buflist) {
1155 mutex_unlock(&dev->struct_mutex);
1156 atomic_dec(&dev->buf_alloc);
1157 return -ENOMEM;
1158 }
1159
1160 entry->buf_size = size;
1161 entry->page_order = page_order;
1162
1163 offset = 0;
1164
1165 while (entry->buf_count < count) {
1166 buf = &entry->buflist[entry->buf_count];
1167 buf->idx = dma->buf_count + entry->buf_count;
1168 buf->total = alignment;
1169 buf->order = order;
1170 buf->used = 0;
1171
1172 buf->offset = (dma->byte_count + offset);
1173 buf->bus_address = agp_offset + offset;
1174 buf->address = (void *)(agp_offset + offset
1175 + (unsigned long)dev->sg->virtual);
1176 buf->next = NULL;
1177 buf->waiting = 0;
1178 buf->pending = 0;
1179 buf->file_priv = NULL;
1180
1181 buf->dev_priv_size = dev->driver->dev_priv_size;
1182 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1183 if (!buf->dev_private) {
1184 /* Set count correctly so we free the proper amount. */
1185 entry->buf_count = count;
1186 drm_cleanup_buf_error(dev, entry);
1187 mutex_unlock(&dev->struct_mutex);
1188 atomic_dec(&dev->buf_alloc);
1189 return -ENOMEM;
1190 }
1191
1192 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1193
1194 offset += alignment;
1195 entry->buf_count++;
1196 byte_count += PAGE_SIZE << page_order;
1197 }
1198
1199 DRM_DEBUG("byte_count: %d\n", byte_count);
1200
1201 temp_buflist = krealloc(dma->buflist,
1202 (dma->buf_count + entry->buf_count) *
1203 sizeof(*dma->buflist), GFP_KERNEL);
1204 if (!temp_buflist) {
1205 /* Free the entry because it isn't valid */
1206 drm_cleanup_buf_error(dev, entry);
1207 mutex_unlock(&dev->struct_mutex);
1208 atomic_dec(&dev->buf_alloc);
1209 return -ENOMEM;
1210 }
1211 dma->buflist = temp_buflist;
1212
1213 for (i = 0; i < entry->buf_count; i++) {
1214 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1215 }
1216
1217 dma->buf_count += entry->buf_count;
1218 dma->seg_count += entry->seg_count;
1219 dma->page_count += byte_count >> PAGE_SHIFT;
1220 dma->byte_count += byte_count;
1221
1222 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1223 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1224
1225 mutex_unlock(&dev->struct_mutex);
1226
1227 request->count = entry->buf_count;
1228 request->size = size;
1229
1230 dma->flags = _DRM_DMA_USE_SG;
1231
1232 atomic_dec(&dev->buf_alloc);
1233 return 0;
1234 }
1235
1236 /*
1237 * Add buffers for DMA transfers (ioctl).
1238 *
1239 * \param inode device inode.
1240 * \param file_priv DRM file private.
1241 * \param cmd command.
1242 * \param arg pointer to a struct drm_buf_desc request.
1243 * \return zero on success or a negative number on failure.
1244 *
1245 * According with the memory type specified in drm_buf_desc::flags and the
1246 * build options, it dispatches the call either to addbufs_agp(),
1247 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1248 * PCI memory respectively.
1249 */
drm_legacy_addbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1250 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1251 struct drm_file *file_priv)
1252 {
1253 struct drm_buf_desc *request = data;
1254 int ret;
1255
1256 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1257 return -EOPNOTSUPP;
1258
1259 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1260 return -EOPNOTSUPP;
1261
1262 #if IS_ENABLED(CONFIG_AGP)
1263 if (request->flags & _DRM_AGP_BUFFER)
1264 ret = drm_legacy_addbufs_agp(dev, request);
1265 else
1266 #endif
1267 if (request->flags & _DRM_SG_BUFFER)
1268 ret = drm_legacy_addbufs_sg(dev, request);
1269 else if (request->flags & _DRM_FB_BUFFER)
1270 ret = -EINVAL;
1271 else
1272 ret = drm_legacy_addbufs_pci(dev, request);
1273
1274 return ret;
1275 }
1276
1277 /*
1278 * Get information about the buffer mappings.
1279 *
1280 * This was originally mean for debugging purposes, or by a sophisticated
1281 * client library to determine how best to use the available buffers (e.g.,
1282 * large buffers can be used for image transfer).
1283 *
1284 * \param inode device inode.
1285 * \param file_priv DRM file private.
1286 * \param cmd command.
1287 * \param arg pointer to a drm_buf_info structure.
1288 * \return zero on success or a negative number on failure.
1289 *
1290 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1291 * lock, preventing of allocating more buffers after this call. Information
1292 * about each requested buffer is then copied into user space.
1293 */
__drm_legacy_infobufs(struct drm_device * dev,void * data,int * p,int (* f)(void *,int,struct drm_buf_entry *))1294 int __drm_legacy_infobufs(struct drm_device *dev,
1295 void *data, int *p,
1296 int (*f)(void *, int, struct drm_buf_entry *))
1297 {
1298 struct drm_device_dma *dma = dev->dma;
1299 int i;
1300 int count;
1301
1302 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1303 return -EOPNOTSUPP;
1304
1305 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1306 return -EOPNOTSUPP;
1307
1308 if (!dma)
1309 return -EINVAL;
1310
1311 spin_lock(&dev->buf_lock);
1312 if (atomic_read(&dev->buf_alloc)) {
1313 spin_unlock(&dev->buf_lock);
1314 return -EBUSY;
1315 }
1316 ++dev->buf_use; /* Can't allocate more after this call */
1317 spin_unlock(&dev->buf_lock);
1318
1319 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1320 if (dma->bufs[i].buf_count)
1321 ++count;
1322 }
1323
1324 DRM_DEBUG("count = %d\n", count);
1325
1326 if (*p >= count) {
1327 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1328 struct drm_buf_entry *from = &dma->bufs[i];
1329
1330 if (from->buf_count) {
1331 if (f(data, count, from) < 0)
1332 return -EFAULT;
1333 DRM_DEBUG("%d %d %d %d %d\n",
1334 i,
1335 dma->bufs[i].buf_count,
1336 dma->bufs[i].buf_size,
1337 dma->bufs[i].low_mark,
1338 dma->bufs[i].high_mark);
1339 ++count;
1340 }
1341 }
1342 }
1343 *p = count;
1344
1345 return 0;
1346 }
1347
copy_one_buf(void * data,int count,struct drm_buf_entry * from)1348 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1349 {
1350 struct drm_buf_info *request = data;
1351 struct drm_buf_desc __user *to = &request->list[count];
1352 struct drm_buf_desc v = {.count = from->buf_count,
1353 .size = from->buf_size,
1354 .low_mark = from->low_mark,
1355 .high_mark = from->high_mark};
1356
1357 if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1358 return -EFAULT;
1359 return 0;
1360 }
1361
drm_legacy_infobufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1362 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1363 struct drm_file *file_priv)
1364 {
1365 struct drm_buf_info *request = data;
1366
1367 return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1368 }
1369
1370 /*
1371 * Specifies a low and high water mark for buffer allocation
1372 *
1373 * \param inode device inode.
1374 * \param file_priv DRM file private.
1375 * \param cmd command.
1376 * \param arg a pointer to a drm_buf_desc structure.
1377 * \return zero on success or a negative number on failure.
1378 *
1379 * Verifies that the size order is bounded between the admissible orders and
1380 * updates the respective drm_device_dma::bufs entry low and high water mark.
1381 *
1382 * \note This ioctl is deprecated and mostly never used.
1383 */
drm_legacy_markbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1384 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1385 struct drm_file *file_priv)
1386 {
1387 struct drm_device_dma *dma = dev->dma;
1388 struct drm_buf_desc *request = data;
1389 int order;
1390 struct drm_buf_entry *entry;
1391
1392 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1393 return -EOPNOTSUPP;
1394
1395 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1396 return -EOPNOTSUPP;
1397
1398 if (!dma)
1399 return -EINVAL;
1400
1401 DRM_DEBUG("%d, %d, %d\n",
1402 request->size, request->low_mark, request->high_mark);
1403 order = order_base_2(request->size);
1404 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1405 return -EINVAL;
1406 entry = &dma->bufs[order];
1407
1408 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1409 return -EINVAL;
1410 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1411 return -EINVAL;
1412
1413 entry->low_mark = request->low_mark;
1414 entry->high_mark = request->high_mark;
1415
1416 return 0;
1417 }
1418
1419 /*
1420 * Unreserve the buffers in list, previously reserved using drmDMA.
1421 *
1422 * \param inode device inode.
1423 * \param file_priv DRM file private.
1424 * \param cmd command.
1425 * \param arg pointer to a drm_buf_free structure.
1426 * \return zero on success or a negative number on failure.
1427 *
1428 * Calls free_buffer() for each used buffer.
1429 * This function is primarily used for debugging.
1430 */
drm_legacy_freebufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1431 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1432 struct drm_file *file_priv)
1433 {
1434 struct drm_device_dma *dma = dev->dma;
1435 struct drm_buf_free *request = data;
1436 int i;
1437 int idx;
1438 struct drm_buf *buf;
1439
1440 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1441 return -EOPNOTSUPP;
1442
1443 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1444 return -EOPNOTSUPP;
1445
1446 if (!dma)
1447 return -EINVAL;
1448
1449 DRM_DEBUG("%d\n", request->count);
1450 for (i = 0; i < request->count; i++) {
1451 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1452 return -EFAULT;
1453 if (idx < 0 || idx >= dma->buf_count) {
1454 DRM_ERROR("Index %d (of %d max)\n",
1455 idx, dma->buf_count - 1);
1456 return -EINVAL;
1457 }
1458 idx = array_index_nospec(idx, dma->buf_count);
1459 buf = dma->buflist[idx];
1460 if (buf->file_priv != file_priv) {
1461 DRM_ERROR("Process %d freeing buffer not owned\n",
1462 task_pid_nr(current));
1463 return -EINVAL;
1464 }
1465 drm_legacy_free_buffer(dev, buf);
1466 }
1467
1468 return 0;
1469 }
1470
1471 /*
1472 * Maps all of the DMA buffers into client-virtual space (ioctl).
1473 *
1474 * \param inode device inode.
1475 * \param file_priv DRM file private.
1476 * \param cmd command.
1477 * \param arg pointer to a drm_buf_map structure.
1478 * \return zero on success or a negative number on failure.
1479 *
1480 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1481 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1482 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1483 * drm_mmap_dma().
1484 */
__drm_legacy_mapbufs(struct drm_device * dev,void * data,int * p,void __user ** v,int (* f)(void *,int,unsigned long,struct drm_buf *),struct drm_file * file_priv)1485 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1486 void __user **v,
1487 int (*f)(void *, int, unsigned long,
1488 struct drm_buf *),
1489 struct drm_file *file_priv)
1490 {
1491 struct drm_device_dma *dma = dev->dma;
1492 int retcode = 0;
1493 unsigned long virtual;
1494 int i;
1495
1496 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1497 return -EOPNOTSUPP;
1498
1499 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1500 return -EOPNOTSUPP;
1501
1502 if (!dma)
1503 return -EINVAL;
1504
1505 spin_lock(&dev->buf_lock);
1506 if (atomic_read(&dev->buf_alloc)) {
1507 spin_unlock(&dev->buf_lock);
1508 return -EBUSY;
1509 }
1510 dev->buf_use++; /* Can't allocate more after this call */
1511 spin_unlock(&dev->buf_lock);
1512
1513 if (*p >= dma->buf_count) {
1514 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1515 || (drm_core_check_feature(dev, DRIVER_SG)
1516 && (dma->flags & _DRM_DMA_USE_SG))) {
1517 struct drm_local_map *map = dev->agp_buffer_map;
1518 unsigned long token = dev->agp_buffer_token;
1519
1520 if (!map) {
1521 retcode = -EINVAL;
1522 goto done;
1523 }
1524 virtual = vm_mmap(file_priv->filp, 0, map->size,
1525 PROT_READ | PROT_WRITE,
1526 MAP_SHARED,
1527 token);
1528 } else {
1529 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1530 PROT_READ | PROT_WRITE,
1531 MAP_SHARED, 0);
1532 }
1533 if (virtual > -1024UL) {
1534 /* Real error */
1535 retcode = (signed long)virtual;
1536 goto done;
1537 }
1538 *v = (void __user *)virtual;
1539
1540 for (i = 0; i < dma->buf_count; i++) {
1541 if (f(data, i, virtual, dma->buflist[i]) < 0) {
1542 retcode = -EFAULT;
1543 goto done;
1544 }
1545 }
1546 }
1547 done:
1548 *p = dma->buf_count;
1549 DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1550
1551 return retcode;
1552 }
1553
map_one_buf(void * data,int idx,unsigned long virtual,struct drm_buf * buf)1554 static int map_one_buf(void *data, int idx, unsigned long virtual,
1555 struct drm_buf *buf)
1556 {
1557 struct drm_buf_map *request = data;
1558 unsigned long address = virtual + buf->offset; /* *** */
1559
1560 if (copy_to_user(&request->list[idx].idx, &buf->idx,
1561 sizeof(request->list[0].idx)))
1562 return -EFAULT;
1563 if (copy_to_user(&request->list[idx].total, &buf->total,
1564 sizeof(request->list[0].total)))
1565 return -EFAULT;
1566 if (clear_user(&request->list[idx].used, sizeof(int)))
1567 return -EFAULT;
1568 if (copy_to_user(&request->list[idx].address, &address,
1569 sizeof(address)))
1570 return -EFAULT;
1571 return 0;
1572 }
1573
drm_legacy_mapbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1574 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1575 struct drm_file *file_priv)
1576 {
1577 struct drm_buf_map *request = data;
1578
1579 return __drm_legacy_mapbufs(dev, data, &request->count,
1580 &request->virtual, map_one_buf,
1581 file_priv);
1582 }
1583
drm_legacy_dma_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)1584 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1585 struct drm_file *file_priv)
1586 {
1587 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1588 return -EOPNOTSUPP;
1589
1590 if (dev->driver->dma_ioctl)
1591 return dev->driver->dma_ioctl(dev, data, file_priv);
1592 else
1593 return -EINVAL;
1594 }
1595
drm_legacy_getsarea(struct drm_device * dev)1596 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1597 {
1598 struct drm_map_list *entry;
1599
1600 list_for_each_entry(entry, &dev->maplist, head) {
1601 if (entry->map && entry->map->type == _DRM_SHM &&
1602 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1603 return entry->map;
1604 }
1605 }
1606 return NULL;
1607 }
1608 EXPORT_SYMBOL(drm_legacy_getsarea);
1609
