1 /* $NetBSD: drm_bufs.c,v 1.16 2021/12/19 12:30:04 riastradh Exp $ */
2
3 /*
4 * Legacy: Generic DRM Buffer Management
5 *
6 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * All Rights Reserved.
9 *
10 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
11 * Author: Gareth Hughes <gareth@valinux.com>
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a
14 * copy of this software and associated documentation files (the "Software"),
15 * to deal in the Software without restriction, including without limitation
16 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
17 * and/or sell copies of the Software, and to permit persons to whom the
18 * Software is furnished to do so, subject to the following conditions:
19 *
20 * The above copyright notice and this permission notice (including the next
21 * paragraph) shall be included in all copies or substantial portions of the
22 * Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
30 * OTHER DEALINGS IN THE SOFTWARE.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: drm_bufs.c,v 1.16 2021/12/19 12:30:04 riastradh Exp $");
35
36 #include <linux/export.h>
37 #include <linux/log2.h>
38 #include <linux/mm.h>
39 #include <linux/mman.h>
40 #include <linux/nospec.h>
41 #include <linux/slab.h>
42 #include <linux/uaccess.h>
43 #include <linux/vmalloc.h>
44
45 #include <asm/shmparam.h>
46
47 #include <drm/drm_agpsupport.h>
48 #include <drm/drm_device.h>
49 #include <drm/drm_drv.h>
50 #include <drm/drm_file.h>
51 #include <drm/drm_pci.h>
52 #include <drm/drm_print.h>
53
54 #include "drm_legacy.h"
55
56
drm_find_matching_map(struct drm_device * dev,struct drm_local_map * map)57 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
58 struct drm_local_map *map)
59 {
60 struct drm_map_list *entry;
61 list_for_each_entry(entry, &dev->maplist, head) {
62 /*
63 * Because the kernel-userspace ABI is fixed at a 32-bit offset
64 * while PCI resources may live above that, we only compare the
65 * lower 32 bits of the map offset for maps of type
66 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
67 * It is assumed that if a driver have more than one resource
68 * of each type, the lower 32 bits are different.
69 */
70 if (!entry->map ||
71 map->type != entry->map->type ||
72 entry->master != dev->master)
73 continue;
74 switch (map->type) {
75 case _DRM_SHM:
76 if (map->flags != _DRM_CONTAINS_LOCK)
77 break;
78 return entry;
79 case _DRM_REGISTERS:
80 case _DRM_FRAME_BUFFER:
81 if ((entry->map->offset & 0xffffffff) ==
82 (map->offset & 0xffffffff))
83 return entry;
84 default: /* Make gcc happy */
85 ;
86 }
87 if (entry->map->offset == map->offset)
88 return entry;
89 }
90
91 return NULL;
92 }
93
drm_map_handle(struct drm_device * dev,struct drm_hash_item * hash,unsigned long user_token,int hashed_handle,int shm)94 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
95 unsigned long user_token, int hashed_handle, int shm)
96 {
97 int use_hashed_handle, shift;
98 unsigned long add;
99
100 use_hashed_handle = (user_token &~ 0xffffffffUL) || hashed_handle;
101 if (!use_hashed_handle) {
102 int ret;
103 hash->key = user_token >> PAGE_SHIFT;
104 ret = drm_ht_insert_item(&dev->map_hash, hash);
105 if (ret != -EINVAL)
106 return ret;
107 }
108
109 shift = 0;
110 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
111 if (shm && (SHMLBA > PAGE_SIZE)) {
112 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
113
114 /* For shared memory, we have to preserve the SHMLBA
115 * bits of the eventual vma->vm_pgoff value during
116 * mmap(). Otherwise we run into cache aliasing problems
117 * on some platforms. On these platforms, the pgoff of
118 * a mmap() request is used to pick a suitable virtual
119 * address for the mmap() region such that it will not
120 * cause cache aliasing problems.
121 *
122 * Therefore, make sure the SHMLBA relevant bits of the
123 * hash value we use are equal to those in the original
124 * kernel virtual address.
125 */
126 shift = bits;
127 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
128 }
129
130 return drm_ht_just_insert_please(&dev->map_hash, hash,
131 user_token, 32 - PAGE_SHIFT - 3,
132 shift, add);
133 }
134
135 /**
136 * Core function to create a range of memory available for mapping by a
137 * non-root process.
138 *
139 * Adjusts the memory offset to its absolute value according to the mapping
140 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
141 * applicable and if supported by the kernel.
142 */
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)143 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
144 unsigned int size, enum drm_map_type type,
145 enum drm_map_flags flags,
146 struct drm_map_list **maplist)
147 {
148 struct drm_local_map *map;
149 struct drm_map_list *list;
150 drm_dma_handle_t *dmah;
151 unsigned long user_token;
152 int ret;
153
154 map = kmalloc(sizeof(*map), GFP_KERNEL);
155 if (!map)
156 return -ENOMEM;
157
158 map->offset = offset;
159 map->size = size;
160 map->flags = flags;
161 map->type = type;
162
163 /* Only allow shared memory to be removable since we only keep enough
164 * book keeping information about shared memory to allow for removal
165 * when processes fork.
166 */
167 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
168 kfree(map);
169 return -EINVAL;
170 }
171 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
172 (unsigned long long)map->offset, map->size, map->type);
173
174 /* page-align _DRM_SHM maps. They are allocated here so there is no security
175 * hole created by that and it works around various broken drivers that use
176 * a non-aligned quantity to map the SAREA. --BenH
177 */
178 if (map->type == _DRM_SHM)
179 map->size = PAGE_ALIGN(map->size);
180
181 if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
182 kfree(map);
183 return -EINVAL;
184 }
185 map->mtrr = -1;
186 map->handle = NULL;
187
188 switch (map->type) {
189 case _DRM_REGISTERS:
190 case _DRM_FRAME_BUFFER:
191 #ifndef __NetBSD__ /* XXX No idea what this is for... */
192 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
193 if (map->offset + (map->size-1) < map->offset ||
194 map->offset < virt_to_phys(high_memory)) {
195 kfree(map);
196 return -EINVAL;
197 }
198 #endif
199 #endif
200 /* Some drivers preinitialize some maps, without the X Server
201 * needing to be aware of it. Therefore, we just return success
202 * when the server tries to create a duplicate map.
203 */
204 list = drm_find_matching_map(dev, map);
205 if (list != NULL) {
206 if (list->map->size != map->size) {
207 DRM_DEBUG("Matching maps of type %d with "
208 "mismatched sizes, (%ld vs %ld)\n",
209 map->type, map->size,
210 list->map->size);
211 list->map->size = map->size;
212 }
213
214 kfree(map);
215 *maplist = list;
216 return 0;
217 }
218
219 if (map->type == _DRM_FRAME_BUFFER ||
220 (map->flags & _DRM_WRITE_COMBINING)) {
221 map->mtrr =
222 arch_phys_wc_add(map->offset, map->size);
223 }
224 if (map->type == _DRM_REGISTERS) {
225 #ifdef __NetBSD__
226 drm_legacy_ioremap(map, dev);
227 #else
228 if (map->flags & _DRM_WRITE_COMBINING)
229 map->handle = ioremap_wc(map->offset,
230 map->size);
231 else
232 map->handle = ioremap(map->offset, map->size);
233 #endif
234 if (!map->handle) {
235 kfree(map);
236 return -ENOMEM;
237 }
238 }
239
240 break;
241 case _DRM_SHM:
242 list = drm_find_matching_map(dev, map);
243 if (list != NULL) {
244 if (list->map->size != map->size) {
245 DRM_DEBUG("Matching maps of type %d with "
246 "mismatched sizes, (%ld vs %ld)\n",
247 map->type, map->size, list->map->size);
248 list->map->size = map->size;
249 }
250
251 kfree(map);
252 *maplist = list;
253 return 0;
254 }
255 map->handle = vmalloc_user(map->size);
256 DRM_DEBUG("%lu %d %p\n",
257 map->size, order_base_2(map->size), map->handle);
258 if (!map->handle) {
259 kfree(map);
260 return -ENOMEM;
261 }
262 map->offset = (unsigned long)map->handle;
263 if (map->flags & _DRM_CONTAINS_LOCK) {
264 /* Prevent a 2nd X Server from creating a 2nd lock */
265 spin_lock(&dev->master->lock.spinlock);
266 if (dev->master->lock.hw_lock != NULL) {
267 spin_unlock(&dev->master->lock.spinlock);
268 vfree(map->handle);
269 kfree(map);
270 return -EBUSY;
271 }
272 spin_unlock(&dev->master->lock.spinlock);
273 dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */
274 }
275 break;
276 case _DRM_AGP: {
277 struct drm_agp_mem *entry;
278 int valid = 0;
279
280 if (!dev->agp) {
281 kfree(map);
282 return -EINVAL;
283 }
284 #ifdef __alpha__
285 map->offset += dev->hose->mem_space->start;
286 #endif
287 /* In some cases (i810 driver), user space may have already
288 * added the AGP base itself, because dev->agp->base previously
289 * only got set during AGP enable. So, only add the base
290 * address if the map's offset isn't already within the
291 * aperture.
292 */
293 #ifdef __NetBSD__
294 if (map->offset < dev->agp->base ||
295 map->offset > dev->agp->base +
296 dev->agp->agp_info.aki_info.ai_aperture_size - 1) {
297 map->offset += dev->agp->base;
298 }
299 #else
300 if (map->offset < dev->agp->base ||
301 map->offset > dev->agp->base +
302 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
303 map->offset += dev->agp->base;
304 }
305 #endif
306 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
307
308 /* This assumes the DRM is in total control of AGP space.
309 * It's not always the case as AGP can be in the control
310 * of user space (i.e. i810 driver). So this loop will get
311 * skipped and we double check that dev->agp->memory is
312 * actually set as well as being invalid before EPERM'ing
313 */
314 list_for_each_entry(entry, &dev->agp->memory, head) {
315 if ((map->offset >= entry->bound) &&
316 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
317 valid = 1;
318 break;
319 }
320 }
321 if (!list_empty(&dev->agp->memory) && !valid) {
322 kfree(map);
323 return -EPERM;
324 }
325 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
326 (unsigned long long)map->offset, map->size);
327
328 break;
329 }
330 case _DRM_SCATTER_GATHER:
331 if (!dev->sg) {
332 kfree(map);
333 return -EINVAL;
334 }
335 map->offset += (unsigned long)dev->sg->virtual;
336 break;
337 case _DRM_CONSISTENT:
338 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
339 * As we're limiting the address to 2^32-1 (or less),
340 * casting it down to 32 bits is no problem, but we
341 * need to point to a 64bit variable first. */
342 dmah = drm_pci_alloc(dev, map->size, map->size);
343 if (!dmah) {
344 kfree(map);
345 return -ENOMEM;
346 }
347 map->handle = dmah->vaddr;
348 map->offset = (unsigned long)dmah->busaddr;
349 #ifdef __NetBSD__
350 map->lm_data.dmah = dmah;
351 #else
352 kfree(dmah);
353 #endif
354 break;
355 default:
356 kfree(map);
357 return -EINVAL;
358 }
359
360 list = kzalloc(sizeof(*list), GFP_KERNEL);
361 if (!list) {
362 if (map->type == _DRM_REGISTERS)
363 #ifdef __NetBSD__
364 drm_legacy_ioremapfree(map, dev);
365 #else
366 iounmap(map->handle);
367 #endif
368 kfree(map);
369 return -EINVAL;
370 }
371 list->map = map;
372
373 mutex_lock(&dev->struct_mutex);
374 list_add(&list->head, &dev->maplist);
375
376 /* Assign a 32-bit handle */
377 /* We do it here so that dev->struct_mutex protects the increment */
378 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
379 map->offset;
380 ret = drm_map_handle(dev, &list->hash, user_token, 0,
381 (map->type == _DRM_SHM));
382 if (ret) {
383 if (map->type == _DRM_REGISTERS)
384 #ifdef __NetBSD__ /* XXX What about other map types...? */
385 drm_legacy_ioremapfree(map, dev);
386 #else
387 iounmap(map->handle);
388 #endif
389 kfree(map);
390 kfree(list);
391 mutex_unlock(&dev->struct_mutex);
392 return ret;
393 }
394
395 list->user_token = list->hash.key << PAGE_SHIFT;
396 mutex_unlock(&dev->struct_mutex);
397
398 if (!(map->flags & _DRM_DRIVER))
399 list->master = dev->master;
400 *maplist = list;
401 return 0;
402 }
403
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)404 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
405 unsigned int size, enum drm_map_type type,
406 enum drm_map_flags flags, struct drm_local_map **map_ptr)
407 {
408 struct drm_map_list *list;
409 int rc;
410
411 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
412 if (!rc)
413 *map_ptr = list->map;
414 return rc;
415 }
416 EXPORT_SYMBOL(drm_legacy_addmap);
417
drm_legacy_findmap(struct drm_device * dev,unsigned int token)418 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
419 unsigned int token)
420 {
421 struct drm_map_list *_entry;
422 list_for_each_entry(_entry, &dev->maplist, head)
423 if (_entry->user_token == token)
424 return _entry->map;
425 return NULL;
426 }
427 EXPORT_SYMBOL(drm_legacy_findmap);
428
429 /**
430 * Ioctl to specify a range of memory that is available for mapping by a
431 * non-root process.
432 *
433 * \param inode device inode.
434 * \param file_priv DRM file private.
435 * \param cmd command.
436 * \param arg pointer to a drm_map structure.
437 * \return zero on success or a negative value on error.
438 *
439 */
drm_legacy_addmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)440 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
441 struct drm_file *file_priv)
442 {
443 struct drm_map *map = data;
444 struct drm_map_list *maplist;
445 int err;
446
447 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
448 return -EPERM;
449
450 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
451 !drm_core_check_feature(dev, DRIVER_LEGACY))
452 return -EOPNOTSUPP;
453
454 err = drm_addmap_core(dev, map->offset, map->size, map->type,
455 map->flags, &maplist);
456
457 if (err)
458 return err;
459
460 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
461 map->handle = (void *)(unsigned long)maplist->user_token;
462
463 /*
464 * It appears that there are no users of this value whatsoever --
465 * drmAddMap just discards it. Let's not encourage its use.
466 * (Keeping drm_addmap_core's returned mtrr value would be wrong --
467 * it's not a real mtrr index anymore.)
468 */
469 map->mtrr = -1;
470
471 return 0;
472 }
473
474 /*
475 * Get a mapping information.
476 *
477 * \param inode device inode.
478 * \param file_priv DRM file private.
479 * \param cmd command.
480 * \param arg user argument, pointing to a drm_map structure.
481 *
482 * \return zero on success or a negative number on failure.
483 *
484 * Searches for the mapping with the specified offset and copies its information
485 * into userspace
486 */
drm_legacy_getmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)487 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
488 struct drm_file *file_priv)
489 {
490 struct drm_map *map = data;
491 struct drm_map_list *r_list = NULL;
492 struct list_head *list;
493 int idx;
494 int i;
495
496 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
497 !drm_core_check_feature(dev, DRIVER_LEGACY))
498 return -EOPNOTSUPP;
499
500 idx = map->offset;
501 if (idx < 0)
502 return -EINVAL;
503
504 i = 0;
505 mutex_lock(&dev->struct_mutex);
506 list_for_each(list, &dev->maplist) {
507 if (i == idx) {
508 r_list = list_entry(list, struct drm_map_list, head);
509 break;
510 }
511 i++;
512 }
513 if (!r_list || !r_list->map) {
514 mutex_unlock(&dev->struct_mutex);
515 return -EINVAL;
516 }
517
518 map->offset = r_list->map->offset;
519 map->size = r_list->map->size;
520 map->type = r_list->map->type;
521 map->flags = r_list->map->flags;
522 map->handle = (void *)(unsigned long) r_list->user_token;
523 map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
524
525 mutex_unlock(&dev->struct_mutex);
526
527 return 0;
528 }
529
530 /**
531 * Remove a map private from list and deallocate resources if the mapping
532 * isn't in use.
533 *
534 * Searches the map on drm_device::maplist, removes it from the list, see if
535 * it's being used, and free any associated resource (such as MTRR's) if it's not
536 * being on use.
537 *
538 * \sa drm_legacy_addmap
539 */
drm_legacy_rmmap_locked(struct drm_device * dev,struct drm_local_map * map)540 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
541 {
542 struct drm_map_list *r_list = NULL, *list_t;
543 #ifndef __NetBSD__
544 drm_dma_handle_t dmah;
545 #endif
546 int found = 0;
547 struct drm_master *master;
548
549 /* Find the list entry for the map and remove it */
550 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
551 if (r_list->map == map) {
552 master = r_list->master;
553 list_del(&r_list->head);
554 drm_ht_remove_key(&dev->map_hash,
555 r_list->user_token >> PAGE_SHIFT);
556 kfree(r_list);
557 found = 1;
558 break;
559 }
560 }
561
562 if (!found)
563 return -EINVAL;
564
565 switch (map->type) {
566 case _DRM_REGISTERS:
567 #ifdef __NetBSD__
568 drm_legacy_ioremapfree(map, dev);
569 #else
570 iounmap(map->handle);
571 #endif
572 /* FALLTHROUGH */
573 case _DRM_FRAME_BUFFER:
574 arch_phys_wc_del(map->mtrr);
575 break;
576 case _DRM_SHM:
577 if (master && (map->flags & _DRM_CONTAINS_LOCK)) {
578 spin_lock(&master->lock.spinlock);
579 /*
580 * If we successfully removed this mapping,
581 * then the mapping must have been there in the
582 * first place, and we must have had a
583 * heavyweight lock, so we assert here instead
584 * of just checking and failing.
585 *
586 * XXX What about the _DRM_CONTAINS_LOCK flag?
587 * Where is that supposed to be set? Is it
588 * equivalent to having a master set?
589 *
590 * XXX There is copypasta of this in
591 * drm_lock.c, drm_legacy_lock_master_cleanup.
592 */
593 BUG_ON(master->lock.hw_lock == NULL);
594 if (dev->sigdata.lock == master->lock.hw_lock)
595 dev->sigdata.lock = NULL;
596 master->lock.hw_lock = NULL; /* SHM removed */
597 master->lock.file_priv = NULL;
598 #ifdef __NetBSD__
599 DRM_SPIN_WAKEUP_ALL(&master->lock.lock_queue,
600 &master->lock.spinlock);
601 #else
602 wake_up_interruptible_all(&master->lock.lock_queue);
603 #endif
604 spin_unlock(&master->lock.spinlock);
605 }
606 vfree(map->handle);
607 break;
608 case _DRM_AGP:
609 case _DRM_SCATTER_GATHER:
610 break;
611 case _DRM_CONSISTENT:
612 #ifdef __NetBSD__
613 drm_pci_free(dev, map->lm_data.dmah);
614 #else
615 dmah.vaddr = map->handle;
616 dmah.busaddr = map->offset;
617 dmah.size = map->size;
618 __drm_legacy_pci_free(dev, &dmah);
619 #endif
620 break;
621 }
622 kfree(map);
623
624 return 0;
625 }
626 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
627
drm_legacy_rmmap(struct drm_device * dev,struct drm_local_map * map)628 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
629 {
630 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
631 !drm_core_check_feature(dev, DRIVER_LEGACY))
632 return;
633
634 mutex_lock(&dev->struct_mutex);
635 drm_legacy_rmmap_locked(dev, map);
636 mutex_unlock(&dev->struct_mutex);
637 }
638 EXPORT_SYMBOL(drm_legacy_rmmap);
639
drm_legacy_master_rmmaps(struct drm_device * dev,struct drm_master * master)640 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
641 {
642 struct drm_map_list *r_list, *list_temp;
643
644 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
645 return;
646
647 mutex_lock(&dev->struct_mutex);
648 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
649 if (r_list->master == master) {
650 drm_legacy_rmmap_locked(dev, r_list->map);
651 r_list = NULL;
652 }
653 }
654 mutex_unlock(&dev->struct_mutex);
655 }
656
drm_legacy_rmmaps(struct drm_device * dev)657 void drm_legacy_rmmaps(struct drm_device *dev)
658 {
659 struct drm_map_list *r_list, *list_temp;
660
661 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
662 drm_legacy_rmmap(dev, r_list->map);
663 }
664
665 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
666 * the last close of the device, and this is necessary for cleanup when things
667 * exit uncleanly. Therefore, having userland manually remove mappings seems
668 * like a pointless exercise since they're going away anyway.
669 *
670 * One use case might be after addmap is allowed for normal users for SHM and
671 * gets used by drivers that the server doesn't need to care about. This seems
672 * unlikely.
673 *
674 * \param inode device inode.
675 * \param file_priv DRM file private.
676 * \param cmd command.
677 * \param arg pointer to a struct drm_map structure.
678 * \return zero on success or a negative value on error.
679 */
drm_legacy_rmmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)680 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
681 struct drm_file *file_priv)
682 {
683 struct drm_map *request = data;
684 struct drm_local_map *map = NULL;
685 struct drm_map_list *r_list;
686 int ret;
687
688 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
689 !drm_core_check_feature(dev, DRIVER_LEGACY))
690 return -EOPNOTSUPP;
691
692 mutex_lock(&dev->struct_mutex);
693 list_for_each_entry(r_list, &dev->maplist, head) {
694 if (r_list->map &&
695 r_list->user_token == (unsigned long)request->handle &&
696 r_list->map->flags & _DRM_REMOVABLE) {
697 map = r_list->map;
698 break;
699 }
700 }
701
702 /* List has wrapped around to the head pointer, or it's empty we didn't
703 * find anything.
704 */
705 if (list_empty(&dev->maplist) || !map) {
706 mutex_unlock(&dev->struct_mutex);
707 return -EINVAL;
708 }
709
710 /* Register and framebuffer maps are permanent */
711 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
712 mutex_unlock(&dev->struct_mutex);
713 return 0;
714 }
715
716 ret = drm_legacy_rmmap_locked(dev, map);
717
718 mutex_unlock(&dev->struct_mutex);
719
720 return ret;
721 }
722
723 /**
724 * Cleanup after an error on one of the addbufs() functions.
725 *
726 * \param dev DRM device.
727 * \param entry buffer entry where the error occurred.
728 *
729 * Frees any pages and buffers associated with the given entry.
730 */
drm_cleanup_buf_error(struct drm_device * dev,struct drm_buf_entry * entry)731 static void drm_cleanup_buf_error(struct drm_device *dev,
732 struct drm_buf_entry *entry)
733 {
734 int i;
735
736 if (entry->seg_count) {
737 for (i = 0; i < entry->seg_count; i++) {
738 if (entry->seglist[i]) {
739 drm_pci_free(dev, entry->seglist[i]);
740 }
741 }
742 kfree(entry->seglist);
743
744 entry->seg_count = 0;
745 }
746
747 if (entry->buf_count) {
748 for (i = 0; i < entry->buf_count; i++) {
749 kfree(entry->buflist[i].dev_private);
750 }
751 kfree(entry->buflist);
752
753 entry->buf_count = 0;
754 }
755 }
756
757 #if IS_ENABLED(CONFIG_AGP)
758 /**
759 * Add AGP buffers for DMA transfers.
760 *
761 * \param dev struct drm_device to which the buffers are to be added.
762 * \param request pointer to a struct drm_buf_desc describing the request.
763 * \return zero on success or a negative number on failure.
764 *
765 * After some sanity checks creates a drm_buf structure for each buffer and
766 * reallocates the buffer list of the same size order to accommodate the new
767 * buffers.
768 */
drm_legacy_addbufs_agp(struct drm_device * dev,struct drm_buf_desc * request)769 int drm_legacy_addbufs_agp(struct drm_device *dev,
770 struct drm_buf_desc *request)
771 {
772 struct drm_device_dma *dma = dev->dma;
773 struct drm_buf_entry *entry;
774 struct drm_agp_mem *agp_entry;
775 struct drm_buf *buf;
776 unsigned long offset;
777 unsigned long agp_offset;
778 int count;
779 int order;
780 int size;
781 int alignment;
782 int page_order;
783 int total;
784 int byte_count;
785 int i, valid;
786 struct drm_buf **temp_buflist;
787
788 if (!dma)
789 return -EINVAL;
790
791 count = request->count;
792 order = order_base_2(request->size);
793 size = 1 << order;
794
795 alignment = (request->flags & _DRM_PAGE_ALIGN)
796 ? PAGE_ALIGN(size) : size;
797 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
798 total = PAGE_SIZE << page_order;
799
800 byte_count = 0;
801 agp_offset = dev->agp->base + request->agp_start;
802
803 DRM_DEBUG("count: %d\n", count);
804 DRM_DEBUG("order: %d\n", order);
805 DRM_DEBUG("size: %d\n", size);
806 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
807 DRM_DEBUG("alignment: %d\n", alignment);
808 DRM_DEBUG("page_order: %d\n", page_order);
809 DRM_DEBUG("total: %d\n", total);
810
811 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
812 return -EINVAL;
813
814 /* Make sure buffers are located in AGP memory that we own */
815 valid = 0;
816 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
817 if ((agp_offset >= agp_entry->bound) &&
818 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
819 valid = 1;
820 break;
821 }
822 }
823 if (!list_empty(&dev->agp->memory) && !valid) {
824 DRM_DEBUG("zone invalid\n");
825 return -EINVAL;
826 }
827 spin_lock(&dev->buf_lock);
828 if (dev->buf_use) {
829 spin_unlock(&dev->buf_lock);
830 return -EBUSY;
831 }
832 atomic_inc(&dev->buf_alloc);
833 spin_unlock(&dev->buf_lock);
834
835 mutex_lock(&dev->struct_mutex);
836 entry = &dma->bufs[order];
837 if (entry->buf_count) {
838 mutex_unlock(&dev->struct_mutex);
839 atomic_dec(&dev->buf_alloc);
840 return -ENOMEM; /* May only call once for each order */
841 }
842
843 if (count < 0 || count > 4096) {
844 mutex_unlock(&dev->struct_mutex);
845 atomic_dec(&dev->buf_alloc);
846 return -EINVAL;
847 }
848
849 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
850 if (!entry->buflist) {
851 mutex_unlock(&dev->struct_mutex);
852 atomic_dec(&dev->buf_alloc);
853 return -ENOMEM;
854 }
855
856 entry->buf_size = size;
857 entry->page_order = page_order;
858
859 offset = 0;
860
861 while (entry->buf_count < count) {
862 buf = &entry->buflist[entry->buf_count];
863 buf->idx = dma->buf_count + entry->buf_count;
864 buf->total = alignment;
865 buf->order = order;
866 buf->used = 0;
867
868 buf->offset = (dma->byte_count + offset);
869 buf->bus_address = agp_offset + offset;
870 buf->address = (void *)(agp_offset + offset);
871 buf->next = NULL;
872 buf->waiting = 0;
873 buf->pending = 0;
874 buf->file_priv = NULL;
875
876 buf->dev_priv_size = dev->driver->dev_priv_size;
877 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
878 if (!buf->dev_private) {
879 /* Set count correctly so we free the proper amount. */
880 entry->buf_count = count;
881 drm_cleanup_buf_error(dev, entry);
882 mutex_unlock(&dev->struct_mutex);
883 atomic_dec(&dev->buf_alloc);
884 return -ENOMEM;
885 }
886
887 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
888
889 offset += alignment;
890 entry->buf_count++;
891 byte_count += PAGE_SIZE << page_order;
892 }
893
894 DRM_DEBUG("byte_count: %d\n", byte_count);
895
896 temp_buflist = krealloc(dma->buflist,
897 (dma->buf_count + entry->buf_count) *
898 sizeof(*dma->buflist), GFP_KERNEL);
899 if (!temp_buflist) {
900 /* Free the entry because it isn't valid */
901 drm_cleanup_buf_error(dev, entry);
902 mutex_unlock(&dev->struct_mutex);
903 atomic_dec(&dev->buf_alloc);
904 return -ENOMEM;
905 }
906 dma->buflist = temp_buflist;
907
908 for (i = 0; i < entry->buf_count; i++) {
909 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
910 }
911
912 dma->buf_count += entry->buf_count;
913 dma->seg_count += entry->seg_count;
914 dma->page_count += byte_count >> PAGE_SHIFT;
915 dma->byte_count += byte_count;
916
917 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
918 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
919
920 mutex_unlock(&dev->struct_mutex);
921
922 request->count = entry->buf_count;
923 request->size = size;
924
925 dma->flags = _DRM_DMA_USE_AGP;
926
927 atomic_dec(&dev->buf_alloc);
928 return 0;
929 }
930 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
931 #endif /* CONFIG_AGP */
932
drm_legacy_addbufs_pci(struct drm_device * dev,struct drm_buf_desc * request)933 int drm_legacy_addbufs_pci(struct drm_device *dev,
934 struct drm_buf_desc *request)
935 {
936 struct drm_device_dma *dma = dev->dma;
937 int count;
938 int order;
939 int size;
940 int total;
941 int page_order;
942 struct drm_buf_entry *entry;
943 drm_dma_handle_t *dmah;
944 struct drm_buf *buf;
945 int alignment;
946 unsigned long offset;
947 int i;
948 int byte_count;
949 int page_count;
950 unsigned long *temp_pagelist;
951 struct drm_buf **temp_buflist;
952
953 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
954 return -EOPNOTSUPP;
955
956 if (!dma)
957 return -EINVAL;
958
959 if (!capable(CAP_SYS_ADMIN))
960 return -EPERM;
961
962 count = request->count;
963 order = order_base_2(request->size);
964 size = 1 << order;
965
966 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
967 request->count, request->size, size, order);
968
969 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
970 return -EINVAL;
971
972 alignment = (request->flags & _DRM_PAGE_ALIGN)
973 ? PAGE_ALIGN(size) : size;
974 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
975 total = PAGE_SIZE << page_order;
976
977 spin_lock(&dev->buf_lock);
978 if (dev->buf_use) {
979 spin_unlock(&dev->buf_lock);
980 return -EBUSY;
981 }
982 atomic_inc(&dev->buf_alloc);
983 spin_unlock(&dev->buf_lock);
984
985 mutex_lock(&dev->struct_mutex);
986 entry = &dma->bufs[order];
987 if (entry->buf_count) {
988 mutex_unlock(&dev->struct_mutex);
989 atomic_dec(&dev->buf_alloc);
990 return -ENOMEM; /* May only call once for each order */
991 }
992
993 if (count < 0 || count > 4096) {
994 mutex_unlock(&dev->struct_mutex);
995 atomic_dec(&dev->buf_alloc);
996 return -EINVAL;
997 }
998
999 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1000 if (!entry->buflist) {
1001 mutex_unlock(&dev->struct_mutex);
1002 atomic_dec(&dev->buf_alloc);
1003 return -ENOMEM;
1004 }
1005
1006 entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
1007 if (!entry->seglist) {
1008 kfree(entry->buflist);
1009 mutex_unlock(&dev->struct_mutex);
1010 atomic_dec(&dev->buf_alloc);
1011 return -ENOMEM;
1012 }
1013
1014 /* Keep the original pagelist until we know all the allocations
1015 * have succeeded
1016 */
1017 temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
1018 sizeof(*dma->pagelist),
1019 GFP_KERNEL);
1020 if (!temp_pagelist) {
1021 kfree(entry->buflist);
1022 kfree(entry->seglist);
1023 mutex_unlock(&dev->struct_mutex);
1024 atomic_dec(&dev->buf_alloc);
1025 return -ENOMEM;
1026 }
1027 memcpy(temp_pagelist,
1028 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
1029 DRM_DEBUG("pagelist: %d entries\n",
1030 dma->page_count + (count << page_order));
1031
1032 entry->buf_size = size;
1033 entry->page_order = page_order;
1034 byte_count = 0;
1035 page_count = 0;
1036
1037 while (entry->buf_count < count) {
1038
1039 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
1040
1041 if (!dmah) {
1042 /* Set count correctly so we free the proper amount. */
1043 entry->buf_count = count;
1044 entry->seg_count = count;
1045 drm_cleanup_buf_error(dev, entry);
1046 kfree(temp_pagelist);
1047 mutex_unlock(&dev->struct_mutex);
1048 atomic_dec(&dev->buf_alloc);
1049 return -ENOMEM;
1050 }
1051 entry->seglist[entry->seg_count++] = dmah;
1052 for (i = 0; i < (1 << page_order); i++) {
1053 DRM_DEBUG("page %d @ 0x%08lx\n",
1054 dma->page_count + page_count,
1055 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
1056 temp_pagelist[dma->page_count + page_count++]
1057 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1058 }
1059 for (offset = 0;
1060 offset + size <= total && entry->buf_count < count;
1061 offset += alignment, ++entry->buf_count) {
1062 buf = &entry->buflist[entry->buf_count];
1063 buf->idx = dma->buf_count + entry->buf_count;
1064 buf->total = alignment;
1065 buf->order = order;
1066 buf->used = 0;
1067 buf->offset = (dma->byte_count + byte_count + offset);
1068 buf->address = (void *)(dmah->vaddr + offset);
1069 buf->bus_address = dmah->busaddr + offset;
1070 buf->next = NULL;
1071 buf->waiting = 0;
1072 buf->pending = 0;
1073 buf->file_priv = NULL;
1074
1075 buf->dev_priv_size = dev->driver->dev_priv_size;
1076 buf->dev_private = kzalloc(buf->dev_priv_size,
1077 GFP_KERNEL);
1078 if (!buf->dev_private) {
1079 /* Set count correctly so we free the proper amount. */
1080 entry->buf_count = count;
1081 entry->seg_count = count;
1082 drm_cleanup_buf_error(dev, entry);
1083 kfree(temp_pagelist);
1084 mutex_unlock(&dev->struct_mutex);
1085 atomic_dec(&dev->buf_alloc);
1086 return -ENOMEM;
1087 }
1088
1089 DRM_DEBUG("buffer %d @ %p\n",
1090 entry->buf_count, buf->address);
1091 }
1092 byte_count += PAGE_SIZE << page_order;
1093 }
1094
1095 temp_buflist = krealloc(dma->buflist,
1096 (dma->buf_count + entry->buf_count) *
1097 sizeof(*dma->buflist), GFP_KERNEL);
1098 if (!temp_buflist) {
1099 /* Free the entry because it isn't valid */
1100 drm_cleanup_buf_error(dev, entry);
1101 kfree(temp_pagelist);
1102 mutex_unlock(&dev->struct_mutex);
1103 atomic_dec(&dev->buf_alloc);
1104 return -ENOMEM;
1105 }
1106 dma->buflist = temp_buflist;
1107
1108 for (i = 0; i < entry->buf_count; i++) {
1109 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1110 }
1111
1112 /* No allocations failed, so now we can replace the original pagelist
1113 * with the new one.
1114 */
1115 if (dma->page_count) {
1116 kfree(dma->pagelist);
1117 }
1118 dma->pagelist = temp_pagelist;
1119
1120 dma->buf_count += entry->buf_count;
1121 dma->seg_count += entry->seg_count;
1122 dma->page_count += entry->seg_count << page_order;
1123 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1124
1125 mutex_unlock(&dev->struct_mutex);
1126
1127 request->count = entry->buf_count;
1128 request->size = size;
1129
1130 if (request->flags & _DRM_PCI_BUFFER_RO)
1131 dma->flags = _DRM_DMA_USE_PCI_RO;
1132
1133 atomic_dec(&dev->buf_alloc);
1134 return 0;
1135
1136 }
1137 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1138
drm_legacy_addbufs_sg(struct drm_device * dev,struct drm_buf_desc * request)1139 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1140 struct drm_buf_desc *request)
1141 {
1142 struct drm_device_dma *dma = dev->dma;
1143 struct drm_buf_entry *entry;
1144 struct drm_buf *buf;
1145 unsigned long offset;
1146 unsigned long agp_offset;
1147 int count;
1148 int order;
1149 int size;
1150 int alignment;
1151 int page_order;
1152 int total;
1153 int byte_count;
1154 int i;
1155 struct drm_buf **temp_buflist;
1156
1157 if (!drm_core_check_feature(dev, DRIVER_SG))
1158 return -EOPNOTSUPP;
1159
1160 if (!dma)
1161 return -EINVAL;
1162
1163 if (!capable(CAP_SYS_ADMIN))
1164 return -EPERM;
1165
1166 count = request->count;
1167 order = order_base_2(request->size);
1168 size = 1 << order;
1169
1170 alignment = (request->flags & _DRM_PAGE_ALIGN)
1171 ? PAGE_ALIGN(size) : size;
1172 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1173 total = PAGE_SIZE << page_order;
1174
1175 byte_count = 0;
1176 agp_offset = request->agp_start;
1177
1178 DRM_DEBUG("count: %d\n", count);
1179 DRM_DEBUG("order: %d\n", order);
1180 DRM_DEBUG("size: %d\n", size);
1181 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1182 DRM_DEBUG("alignment: %d\n", alignment);
1183 DRM_DEBUG("page_order: %d\n", page_order);
1184 DRM_DEBUG("total: %d\n", total);
1185
1186 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1187 return -EINVAL;
1188
1189 spin_lock(&dev->buf_lock);
1190 if (dev->buf_use) {
1191 spin_unlock(&dev->buf_lock);
1192 return -EBUSY;
1193 }
1194 atomic_inc(&dev->buf_alloc);
1195 spin_unlock(&dev->buf_lock);
1196
1197 mutex_lock(&dev->struct_mutex);
1198 entry = &dma->bufs[order];
1199 if (entry->buf_count) {
1200 mutex_unlock(&dev->struct_mutex);
1201 atomic_dec(&dev->buf_alloc);
1202 return -ENOMEM; /* May only call once for each order */
1203 }
1204
1205 if (count < 0 || count > 4096) {
1206 mutex_unlock(&dev->struct_mutex);
1207 atomic_dec(&dev->buf_alloc);
1208 return -EINVAL;
1209 }
1210
1211 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1212 if (!entry->buflist) {
1213 mutex_unlock(&dev->struct_mutex);
1214 atomic_dec(&dev->buf_alloc);
1215 return -ENOMEM;
1216 }
1217
1218 entry->buf_size = size;
1219 entry->page_order = page_order;
1220
1221 offset = 0;
1222
1223 while (entry->buf_count < count) {
1224 buf = &entry->buflist[entry->buf_count];
1225 buf->idx = dma->buf_count + entry->buf_count;
1226 buf->total = alignment;
1227 buf->order = order;
1228 buf->used = 0;
1229
1230 buf->offset = (dma->byte_count + offset);
1231 buf->bus_address = agp_offset + offset;
1232 buf->address = (void *)(agp_offset + offset
1233 + (unsigned long)dev->sg->virtual);
1234 buf->next = NULL;
1235 buf->waiting = 0;
1236 buf->pending = 0;
1237 buf->file_priv = NULL;
1238
1239 buf->dev_priv_size = dev->driver->dev_priv_size;
1240 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1241 if (!buf->dev_private) {
1242 /* Set count correctly so we free the proper amount. */
1243 entry->buf_count = count;
1244 drm_cleanup_buf_error(dev, entry);
1245 mutex_unlock(&dev->struct_mutex);
1246 atomic_dec(&dev->buf_alloc);
1247 return -ENOMEM;
1248 }
1249
1250 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1251
1252 offset += alignment;
1253 entry->buf_count++;
1254 byte_count += PAGE_SIZE << page_order;
1255 }
1256
1257 DRM_DEBUG("byte_count: %d\n", byte_count);
1258
1259 temp_buflist = krealloc(dma->buflist,
1260 (dma->buf_count + entry->buf_count) *
1261 sizeof(*dma->buflist), GFP_KERNEL);
1262 if (!temp_buflist) {
1263 /* Free the entry because it isn't valid */
1264 drm_cleanup_buf_error(dev, entry);
1265 mutex_unlock(&dev->struct_mutex);
1266 atomic_dec(&dev->buf_alloc);
1267 return -ENOMEM;
1268 }
1269 dma->buflist = temp_buflist;
1270
1271 for (i = 0; i < entry->buf_count; i++) {
1272 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1273 }
1274
1275 dma->buf_count += entry->buf_count;
1276 dma->seg_count += entry->seg_count;
1277 dma->page_count += byte_count >> PAGE_SHIFT;
1278 dma->byte_count += byte_count;
1279
1280 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1281 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1282
1283 mutex_unlock(&dev->struct_mutex);
1284
1285 request->count = entry->buf_count;
1286 request->size = size;
1287
1288 dma->flags = _DRM_DMA_USE_SG;
1289
1290 atomic_dec(&dev->buf_alloc);
1291 return 0;
1292 }
1293
1294 /**
1295 * Add buffers for DMA transfers (ioctl).
1296 *
1297 * \param inode device inode.
1298 * \param file_priv DRM file private.
1299 * \param cmd command.
1300 * \param arg pointer to a struct drm_buf_desc request.
1301 * \return zero on success or a negative number on failure.
1302 *
1303 * According with the memory type specified in drm_buf_desc::flags and the
1304 * build options, it dispatches the call either to addbufs_agp(),
1305 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1306 * PCI memory respectively.
1307 */
drm_legacy_addbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1308 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1309 struct drm_file *file_priv)
1310 {
1311 struct drm_buf_desc *request = data;
1312 int ret;
1313
1314 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1315 return -EOPNOTSUPP;
1316
1317 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1318 return -EOPNOTSUPP;
1319
1320 #if IS_ENABLED(CONFIG_AGP)
1321 if (request->flags & _DRM_AGP_BUFFER)
1322 ret = drm_legacy_addbufs_agp(dev, request);
1323 else
1324 #endif
1325 if (request->flags & _DRM_SG_BUFFER)
1326 ret = drm_legacy_addbufs_sg(dev, request);
1327 else if (request->flags & _DRM_FB_BUFFER)
1328 ret = -EINVAL;
1329 else
1330 ret = drm_legacy_addbufs_pci(dev, request);
1331
1332 return ret;
1333 }
1334
1335 /**
1336 * Get information about the buffer mappings.
1337 *
1338 * This was originally mean for debugging purposes, or by a sophisticated
1339 * client library to determine how best to use the available buffers (e.g.,
1340 * large buffers can be used for image transfer).
1341 *
1342 * \param inode device inode.
1343 * \param file_priv DRM file private.
1344 * \param cmd command.
1345 * \param arg pointer to a drm_buf_info structure.
1346 * \return zero on success or a negative number on failure.
1347 *
1348 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1349 * lock, preventing of allocating more buffers after this call. Information
1350 * about each requested buffer is then copied into user space.
1351 */
__drm_legacy_infobufs(struct drm_device * dev,void * data,int * p,int (* f)(void *,int,struct drm_buf_entry *))1352 int __drm_legacy_infobufs(struct drm_device *dev,
1353 void *data, int *p,
1354 int (*f)(void *, int, struct drm_buf_entry *))
1355 {
1356 struct drm_device_dma *dma = dev->dma;
1357 int i;
1358 int count;
1359
1360 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1361 return -EOPNOTSUPP;
1362
1363 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1364 return -EOPNOTSUPP;
1365
1366 if (!dma)
1367 return -EINVAL;
1368
1369 spin_lock(&dev->buf_lock);
1370 if (atomic_read(&dev->buf_alloc)) {
1371 spin_unlock(&dev->buf_lock);
1372 return -EBUSY;
1373 }
1374 ++dev->buf_use; /* Can't allocate more after this call */
1375 spin_unlock(&dev->buf_lock);
1376
1377 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1378 if (dma->bufs[i].buf_count)
1379 ++count;
1380 }
1381
1382 DRM_DEBUG("count = %d\n", count);
1383
1384 if (*p >= count) {
1385 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1386 struct drm_buf_entry *from = &dma->bufs[i];
1387 if (from->buf_count) {
1388 if (f(data, count, from) < 0)
1389 return -EFAULT;
1390 DRM_DEBUG("%d %d %d %d %d\n",
1391 i,
1392 dma->bufs[i].buf_count,
1393 dma->bufs[i].buf_size,
1394 dma->bufs[i].low_mark,
1395 dma->bufs[i].high_mark);
1396 ++count;
1397 }
1398 }
1399 }
1400 *p = count;
1401
1402 return 0;
1403 }
1404
copy_one_buf(void * data,int count,struct drm_buf_entry * from)1405 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1406 {
1407 struct drm_buf_info *request = data;
1408 struct drm_buf_desc __user *to = &request->list[count];
1409 struct drm_buf_desc v = {.count = from->buf_count,
1410 .size = from->buf_size,
1411 .low_mark = from->low_mark,
1412 .high_mark = from->high_mark};
1413
1414 if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1415 return -EFAULT;
1416 return 0;
1417 }
1418
drm_legacy_infobufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1419 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1420 struct drm_file *file_priv)
1421 {
1422 struct drm_buf_info *request = data;
1423 return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1424 }
1425
1426 /**
1427 * Specifies a low and high water mark for buffer allocation
1428 *
1429 * \param inode device inode.
1430 * \param file_priv DRM file private.
1431 * \param cmd command.
1432 * \param arg a pointer to a drm_buf_desc structure.
1433 * \return zero on success or a negative number on failure.
1434 *
1435 * Verifies that the size order is bounded between the admissible orders and
1436 * updates the respective drm_device_dma::bufs entry low and high water mark.
1437 *
1438 * \note This ioctl is deprecated and mostly never used.
1439 */
drm_legacy_markbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1440 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1441 struct drm_file *file_priv)
1442 {
1443 struct drm_device_dma *dma = dev->dma;
1444 struct drm_buf_desc *request = data;
1445 int order;
1446 struct drm_buf_entry *entry;
1447
1448 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1449 return -EOPNOTSUPP;
1450
1451 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1452 return -EOPNOTSUPP;
1453
1454 if (!dma)
1455 return -EINVAL;
1456
1457 DRM_DEBUG("%d, %d, %d\n",
1458 request->size, request->low_mark, request->high_mark);
1459 order = order_base_2(request->size);
1460 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1461 return -EINVAL;
1462 entry = &dma->bufs[order];
1463
1464 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1465 return -EINVAL;
1466 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1467 return -EINVAL;
1468
1469 entry->low_mark = request->low_mark;
1470 entry->high_mark = request->high_mark;
1471
1472 return 0;
1473 }
1474
1475 /**
1476 * Unreserve the buffers in list, previously reserved using drmDMA.
1477 *
1478 * \param inode device inode.
1479 * \param file_priv DRM file private.
1480 * \param cmd command.
1481 * \param arg pointer to a drm_buf_free structure.
1482 * \return zero on success or a negative number on failure.
1483 *
1484 * Calls free_buffer() for each used buffer.
1485 * This function is primarily used for debugging.
1486 */
drm_legacy_freebufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1487 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1488 struct drm_file *file_priv)
1489 {
1490 struct drm_device_dma *dma = dev->dma;
1491 struct drm_buf_free *request = data;
1492 int i;
1493 int idx;
1494 struct drm_buf *buf;
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 DRM_DEBUG("%d\n", request->count);
1506 for (i = 0; i < request->count; i++) {
1507 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1508 return -EFAULT;
1509 if (idx < 0 || idx >= dma->buf_count) {
1510 DRM_ERROR("Index %d (of %d max)\n",
1511 idx, dma->buf_count - 1);
1512 return -EINVAL;
1513 }
1514 idx = array_index_nospec(idx, dma->buf_count);
1515 buf = dma->buflist[idx];
1516 if (buf->file_priv != file_priv) {
1517 #ifdef __NetBSD__
1518 DRM_ERROR("Process %d freeing buffer not owned\n",
1519 (int)curproc->p_pid);
1520 #else
1521 DRM_ERROR("Process %d freeing buffer not owned\n",
1522 task_pid_nr(current));
1523 #endif
1524 return -EINVAL;
1525 }
1526 drm_legacy_free_buffer(dev, buf);
1527 }
1528
1529 return 0;
1530 }
1531
1532 /**
1533 * Maps all of the DMA buffers into client-virtual space (ioctl).
1534 *
1535 * \param inode device inode.
1536 * \param file_priv DRM file private.
1537 * \param cmd command.
1538 * \param arg pointer to a drm_buf_map structure.
1539 * \return zero on success or a negative number on failure.
1540 *
1541 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1542 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1543 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1544 * drm_mmap_dma().
1545 */
__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)1546 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1547 void __user **v,
1548 int (*f)(void *, int, unsigned long,
1549 struct drm_buf *),
1550 struct drm_file *file_priv)
1551 {
1552 struct drm_device_dma *dma = dev->dma;
1553 int retcode = 0;
1554 unsigned long virtual;
1555 int i;
1556
1557 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1558 return -EOPNOTSUPP;
1559
1560 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1561 return -EOPNOTSUPP;
1562
1563 if (!dma)
1564 return -EINVAL;
1565
1566 spin_lock(&dev->buf_lock);
1567 if (atomic_read(&dev->buf_alloc)) {
1568 spin_unlock(&dev->buf_lock);
1569 return -EBUSY;
1570 }
1571 dev->buf_use++; /* Can't allocate more after this call */
1572 spin_unlock(&dev->buf_lock);
1573
1574 if (*p >= dma->buf_count) {
1575 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1576 || (drm_core_check_feature(dev, DRIVER_SG)
1577 && (dma->flags & _DRM_DMA_USE_SG))) {
1578 struct drm_local_map *map = dev->agp_buffer_map;
1579 unsigned long token = dev->agp_buffer_token;
1580
1581 if (!map) {
1582 retcode = -EINVAL;
1583 goto done;
1584 }
1585 virtual = vm_mmap(file_priv->filp, 0, map->size,
1586 PROT_READ | PROT_WRITE,
1587 MAP_SHARED,
1588 token);
1589 } else {
1590 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1591 PROT_READ | PROT_WRITE,
1592 MAP_SHARED, 0);
1593 }
1594 if (virtual > -1024UL) {
1595 /* Real error */
1596 retcode = (signed long)virtual;
1597 goto done;
1598 }
1599 *v = (void __user *)virtual;
1600
1601 for (i = 0; i < dma->buf_count; i++) {
1602 if (f(data, i, virtual, dma->buflist[i]) < 0) {
1603 retcode = -EFAULT;
1604 goto done;
1605 }
1606 }
1607 }
1608 done:
1609 *p = dma->buf_count;
1610 DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1611
1612 return retcode;
1613 }
1614
map_one_buf(void * data,int idx,unsigned long virtual,struct drm_buf * buf)1615 static int map_one_buf(void *data, int idx, unsigned long virtual,
1616 struct drm_buf *buf)
1617 {
1618 struct drm_buf_map *request = data;
1619 unsigned long address = virtual + buf->offset; /* *** */
1620
1621 if (copy_to_user(&request->list[idx].idx, &buf->idx,
1622 sizeof(request->list[0].idx)))
1623 return -EFAULT;
1624 if (copy_to_user(&request->list[idx].total, &buf->total,
1625 sizeof(request->list[0].total)))
1626 return -EFAULT;
1627 if (clear_user(&request->list[idx].used, sizeof(int)))
1628 return -EFAULT;
1629 if (copy_to_user(&request->list[idx].address, &address,
1630 sizeof(address)))
1631 return -EFAULT;
1632 return 0;
1633 }
1634
drm_legacy_mapbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1635 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1636 struct drm_file *file_priv)
1637 {
1638 struct drm_buf_map *request = data;
1639 return __drm_legacy_mapbufs(dev, data, &request->count,
1640 &request->virtual, map_one_buf,
1641 file_priv);
1642 }
1643
drm_legacy_dma_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)1644 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1645 struct drm_file *file_priv)
1646 {
1647 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1648 return -EOPNOTSUPP;
1649
1650 if (dev->driver->dma_ioctl)
1651 return dev->driver->dma_ioctl(dev, data, file_priv);
1652 else
1653 return -EINVAL;
1654 }
1655
drm_legacy_getsarea(struct drm_device * dev)1656 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1657 {
1658 struct drm_map_list *entry;
1659
1660 list_for_each_entry(entry, &dev->maplist, head) {
1661 if (entry->map && entry->map->type == _DRM_SHM &&
1662 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1663 return entry->map;
1664 }
1665 }
1666 return NULL;
1667 }
1668 EXPORT_SYMBOL(drm_legacy_getsarea);
1669