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Linux 4.19.133
[linux/fpc-iii.git] / drivers / gpu / drm / drm_bufs.c
blob21bec45480927eb5b4ea3770876f5dc798ef506a
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/vmalloc.h>
32 #include <linux/slab.h>
33 #include <linux/log2.h>
34 #include <linux/export.h>
35 #include <asm/shmparam.h>
36 #include <drm/drmP.h>
37 #include "drm_legacy.h"
38
39 #include <linux/nospec.h>
40
41 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
42 struct drm_local_map *map)
43 {
44 struct drm_map_list *entry;
45 list_for_each_entry(entry, &dev->maplist, head) {
46 /*
47 * Because the kernel-userspace ABI is fixed at a 32-bit offset
48 * while PCI resources may live above that, we only compare the
49 * lower 32 bits of the map offset for maps of type
50 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
51 * It is assumed that if a driver have more than one resource
52 * of each type, the lower 32 bits are different.
53 */
54 if (!entry->map ||
55 map->type != entry->map->type ||
56 entry->master != dev->master)
57 continue;
58 switch (map->type) {
59 case _DRM_SHM:
60 if (map->flags != _DRM_CONTAINS_LOCK)
61 break;
62 return entry;
63 case _DRM_REGISTERS:
64 case _DRM_FRAME_BUFFER:
65 if ((entry->map->offset & 0xffffffff) ==
66 (map->offset & 0xffffffff))
67 return entry;
68 default: /* Make gcc happy */
69 ;
70 }
71 if (entry->map->offset == map->offset)
72 return entry;
73 }
74
75 return NULL;
76 }
77
78 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
79 unsigned long user_token, int hashed_handle, int shm)
80 {
81 int use_hashed_handle, shift;
82 unsigned long add;
83
84 #if (BITS_PER_LONG == 64)
85 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
86 #elif (BITS_PER_LONG == 32)
87 use_hashed_handle = hashed_handle;
88 #else
89 #error Unsupported long size. Neither 64 nor 32 bits.
90 #endif
91
92 if (!use_hashed_handle) {
93 int ret;
94 hash->key = user_token >> PAGE_SHIFT;
95 ret = drm_ht_insert_item(&dev->map_hash, hash);
96 if (ret != -EINVAL)
97 return ret;
98 }
99
100 shift = 0;
101 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
102 if (shm && (SHMLBA > PAGE_SIZE)) {
103 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
104
105 /* For shared memory, we have to preserve the SHMLBA
106 * bits of the eventual vma->vm_pgoff value during
107 * mmap(). Otherwise we run into cache aliasing problems
108 * on some platforms. On these platforms, the pgoff of
109 * a mmap() request is used to pick a suitable virtual
110 * address for the mmap() region such that it will not
111 * cause cache aliasing problems.
112 *
113 * Therefore, make sure the SHMLBA relevant bits of the
114 * hash value we use are equal to those in the original
115 * kernel virtual address.
116 */
117 shift = bits;
118 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
119 }
120
121 return drm_ht_just_insert_please(&dev->map_hash, hash,
122 user_token, 32 - PAGE_SHIFT - 3,
123 shift, add);
124 }
125
126 /**
127 * Core function to create a range of memory available for mapping by a
128 * non-root process.
129 *
130 * Adjusts the memory offset to its absolute value according to the mapping
131 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
132 * applicable and if supported by the kernel.
133 */
134 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
135 unsigned int size, enum drm_map_type type,
136 enum drm_map_flags flags,
137 struct drm_map_list **maplist)
138 {
139 struct drm_local_map *map;
140 struct drm_map_list *list;
141 drm_dma_handle_t *dmah;
142 unsigned long user_token;
143 int ret;
144
145 map = kmalloc(sizeof(*map), GFP_KERNEL);
146 if (!map)
147 return -ENOMEM;
148
149 map->offset = offset;
150 map->size = size;
151 map->flags = flags;
152 map->type = type;
153
154 /* Only allow shared memory to be removable since we only keep enough
155 * book keeping information about shared memory to allow for removal
156 * when processes fork.
157 */
158 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
159 kfree(map);
160 return -EINVAL;
161 }
162 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
163 (unsigned long long)map->offset, map->size, map->type);
164
165 /* page-align _DRM_SHM maps. They are allocated here so there is no security
166 * hole created by that and it works around various broken drivers that use
167 * a non-aligned quantity to map the SAREA. --BenH
168 */
169 if (map->type == _DRM_SHM)
170 map->size = PAGE_ALIGN(map->size);
171
172 if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
173 kfree(map);
174 return -EINVAL;
175 }
176 map->mtrr = -1;
177 map->handle = NULL;
178
179 switch (map->type) {
180 case _DRM_REGISTERS:
181 case _DRM_FRAME_BUFFER:
182 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
183 if (map->offset + (map->size-1) < map->offset ||
184 map->offset < virt_to_phys(high_memory)) {
185 kfree(map);
186 return -EINVAL;
187 }
188 #endif
189 /* Some drivers preinitialize some maps, without the X Server
190 * needing to be aware of it. Therefore, we just return success
191 * when the server tries to create a duplicate map.
192 */
193 list = drm_find_matching_map(dev, map);
194 if (list != NULL) {
195 if (list->map->size != map->size) {
196 DRM_DEBUG("Matching maps of type %d with "
197 "mismatched sizes, (%ld vs %ld)\n",
198 map->type, map->size,
199 list->map->size);
200 list->map->size = map->size;
201 }
202
203 kfree(map);
204 *maplist = list;
205 return 0;
206 }
207
208 if (map->type == _DRM_FRAME_BUFFER ||
209 (map->flags & _DRM_WRITE_COMBINING)) {
210 map->mtrr =
211 arch_phys_wc_add(map->offset, map->size);
212 }
213 if (map->type == _DRM_REGISTERS) {
214 if (map->flags & _DRM_WRITE_COMBINING)
215 map->handle = ioremap_wc(map->offset,
216 map->size);
217 else
218 map->handle = ioremap(map->offset, map->size);
219 if (!map->handle) {
220 kfree(map);
221 return -ENOMEM;
222 }
223 }
224
225 break;
226 case _DRM_SHM:
227 list = drm_find_matching_map(dev, map);
228 if (list != NULL) {
229 if (list->map->size != map->size) {
230 DRM_DEBUG("Matching maps of type %d with "
231 "mismatched sizes, (%ld vs %ld)\n",
232 map->type, map->size, list->map->size);
233 list->map->size = map->size;
234 }
235
236 kfree(map);
237 *maplist = list;
238 return 0;
239 }
240 map->handle = vmalloc_user(map->size);
241 DRM_DEBUG("%lu %d %p\n",
242 map->size, order_base_2(map->size), map->handle);
243 if (!map->handle) {
244 kfree(map);
245 return -ENOMEM;
246 }
247 map->offset = (unsigned long)map->handle;
248 if (map->flags & _DRM_CONTAINS_LOCK) {
249 /* Prevent a 2nd X Server from creating a 2nd lock */
250 if (dev->master->lock.hw_lock != NULL) {
251 vfree(map->handle);
252 kfree(map);
253 return -EBUSY;
254 }
255 dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */
256 }
257 break;
258 case _DRM_AGP: {
259 struct drm_agp_mem *entry;
260 int valid = 0;
261
262 if (!dev->agp) {
263 kfree(map);
264 return -EINVAL;
265 }
266 #ifdef __alpha__
267 map->offset += dev->hose->mem_space->start;
268 #endif
269 /* In some cases (i810 driver), user space may have already
270 * added the AGP base itself, because dev->agp->base previously
271 * only got set during AGP enable. So, only add the base
272 * address if the map's offset isn't already within the
273 * aperture.
274 */
275 if (map->offset < dev->agp->base ||
276 map->offset > dev->agp->base +
277 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
278 map->offset += dev->agp->base;
279 }
280 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
281
282 /* This assumes the DRM is in total control of AGP space.
283 * It's not always the case as AGP can be in the control
284 * of user space (i.e. i810 driver). So this loop will get
285 * skipped and we double check that dev->agp->memory is
286 * actually set as well as being invalid before EPERM'ing
287 */
288 list_for_each_entry(entry, &dev->agp->memory, head) {
289 if ((map->offset >= entry->bound) &&
290 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
291 valid = 1;
292 break;
293 }
294 }
295 if (!list_empty(&dev->agp->memory) && !valid) {
296 kfree(map);
297 return -EPERM;
298 }
299 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
300 (unsigned long long)map->offset, map->size);
301
302 break;
303 }
304 case _DRM_SCATTER_GATHER:
305 if (!dev->sg) {
306 kfree(map);
307 return -EINVAL;
308 }
309 map->offset += (unsigned long)dev->sg->virtual;
310 break;
311 case _DRM_CONSISTENT:
312 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
313 * As we're limiting the address to 2^32-1 (or less),
314 * casting it down to 32 bits is no problem, but we
315 * need to point to a 64bit variable first. */
316 dmah = drm_pci_alloc(dev, map->size, map->size);
317 if (!dmah) {
318 kfree(map);
319 return -ENOMEM;
320 }
321 map->handle = dmah->vaddr;
322 map->offset = (unsigned long)dmah->busaddr;
323 kfree(dmah);
324 break;
325 default:
326 kfree(map);
327 return -EINVAL;
328 }
329
330 list = kzalloc(sizeof(*list), GFP_KERNEL);
331 if (!list) {
332 if (map->type == _DRM_REGISTERS)
333 iounmap(map->handle);
334 kfree(map);
335 return -EINVAL;
336 }
337 list->map = map;
338
339 mutex_lock(&dev->struct_mutex);
340 list_add(&list->head, &dev->maplist);
341
342 /* Assign a 32-bit handle */
343 /* We do it here so that dev->struct_mutex protects the increment */
344 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
345 map->offset;
346 ret = drm_map_handle(dev, &list->hash, user_token, 0,
347 (map->type == _DRM_SHM));
348 if (ret) {
349 if (map->type == _DRM_REGISTERS)
350 iounmap(map->handle);
351 kfree(map);
352 kfree(list);
353 mutex_unlock(&dev->struct_mutex);
354 return ret;
355 }
356
357 list->user_token = list->hash.key << PAGE_SHIFT;
358 mutex_unlock(&dev->struct_mutex);
359
360 if (!(map->flags & _DRM_DRIVER))
361 list->master = dev->master;
362 *maplist = list;
363 return 0;
364 }
365
366 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
367 unsigned int size, enum drm_map_type type,
368 enum drm_map_flags flags, struct drm_local_map **map_ptr)
369 {
370 struct drm_map_list *list;
371 int rc;
372
373 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
374 if (!rc)
375 *map_ptr = list->map;
376 return rc;
377 }
378 EXPORT_SYMBOL(drm_legacy_addmap);
379
380 /**
381 * Ioctl to specify a range of memory that is available for mapping by a
382 * non-root process.
383 *
384 * \param inode device inode.
385 * \param file_priv DRM file private.
386 * \param cmd command.
387 * \param arg pointer to a drm_map structure.
388 * \return zero on success or a negative value on error.
389 *
390 */
391 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
392 struct drm_file *file_priv)
393 {
394 struct drm_map *map = data;
395 struct drm_map_list *maplist;
396 int err;
397
398 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
399 return -EPERM;
400
401 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
402 !drm_core_check_feature(dev, DRIVER_LEGACY))
403 return -EINVAL;
404
405 err = drm_addmap_core(dev, map->offset, map->size, map->type,
406 map->flags, &maplist);
407
408 if (err)
409 return err;
410
411 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
412 map->handle = (void *)(unsigned long)maplist->user_token;
413
414 /*
415 * It appears that there are no users of this value whatsoever --
416 * drmAddMap just discards it. Let's not encourage its use.
417 * (Keeping drm_addmap_core's returned mtrr value would be wrong --
418 * it's not a real mtrr index anymore.)
419 */
420 map->mtrr = -1;
421
422 return 0;
423 }
424
425 /*
426 * Get a mapping information.
427 *
428 * \param inode device inode.
429 * \param file_priv DRM file private.
430 * \param cmd command.
431 * \param arg user argument, pointing to a drm_map structure.
432 *
433 * \return zero on success or a negative number on failure.
434 *
435 * Searches for the mapping with the specified offset and copies its information
436 * into userspace
437 */
438 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
439 struct drm_file *file_priv)
440 {
441 struct drm_map *map = data;
442 struct drm_map_list *r_list = NULL;
443 struct list_head *list;
444 int idx;
445 int i;
446
447 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
448 !drm_core_check_feature(dev, DRIVER_LEGACY))
449 return -EINVAL;
450
451 idx = map->offset;
452 if (idx < 0)
453 return -EINVAL;
454
455 i = 0;
456 mutex_lock(&dev->struct_mutex);
457 list_for_each(list, &dev->maplist) {
458 if (i == idx) {
459 r_list = list_entry(list, struct drm_map_list, head);
460 break;
461 }
462 i++;
463 }
464 if (!r_list || !r_list->map) {
465 mutex_unlock(&dev->struct_mutex);
466 return -EINVAL;
467 }
468
469 map->offset = r_list->map->offset;
470 map->size = r_list->map->size;
471 map->type = r_list->map->type;
472 map->flags = r_list->map->flags;
473 map->handle = (void *)(unsigned long) r_list->user_token;
474 map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
475
476 mutex_unlock(&dev->struct_mutex);
477
478 return 0;
479 }
480
481 /**
482 * Remove a map private from list and deallocate resources if the mapping
483 * isn't in use.
484 *
485 * Searches the map on drm_device::maplist, removes it from the list, see if
486 * its being used, and free any associate resource (such as MTRR's) if it's not
487 * being on use.
488 *
489 * \sa drm_legacy_addmap
490 */
491 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
492 {
493 struct drm_map_list *r_list = NULL, *list_t;
494 drm_dma_handle_t dmah;
495 int found = 0;
496 struct drm_master *master;
497
498 /* Find the list entry for the map and remove it */
499 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
500 if (r_list->map == map) {
501 master = r_list->master;
502 list_del(&r_list->head);
503 drm_ht_remove_key(&dev->map_hash,
504 r_list->user_token >> PAGE_SHIFT);
505 kfree(r_list);
506 found = 1;
507 break;
508 }
509 }
510
511 if (!found)
512 return -EINVAL;
513
514 switch (map->type) {
515 case _DRM_REGISTERS:
516 iounmap(map->handle);
517 /* FALLTHROUGH */
518 case _DRM_FRAME_BUFFER:
519 arch_phys_wc_del(map->mtrr);
520 break;
521 case _DRM_SHM:
522 vfree(map->handle);
523 if (master) {
524 if (dev->sigdata.lock == master->lock.hw_lock)
525 dev->sigdata.lock = NULL;
526 master->lock.hw_lock = NULL; /* SHM removed */
527 master->lock.file_priv = NULL;
528 wake_up_interruptible_all(&master->lock.lock_queue);
529 }
530 break;
531 case _DRM_AGP:
532 case _DRM_SCATTER_GATHER:
533 break;
534 case _DRM_CONSISTENT:
535 dmah.vaddr = map->handle;
536 dmah.busaddr = map->offset;
537 dmah.size = map->size;
538 __drm_legacy_pci_free(dev, &dmah);
539 break;
540 }
541 kfree(map);
542
543 return 0;
544 }
545 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
546
547 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
548 {
549 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
550 !drm_core_check_feature(dev, DRIVER_LEGACY))
551 return;
552
553 mutex_lock(&dev->struct_mutex);
554 drm_legacy_rmmap_locked(dev, map);
555 mutex_unlock(&dev->struct_mutex);
556 }
557 EXPORT_SYMBOL(drm_legacy_rmmap);
558
559 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
560 {
561 struct drm_map_list *r_list, *list_temp;
562
563 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
564 return;
565
566 mutex_lock(&dev->struct_mutex);
567 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
568 if (r_list->master == master) {
569 drm_legacy_rmmap_locked(dev, r_list->map);
570 r_list = NULL;
571 }
572 }
573 mutex_unlock(&dev->struct_mutex);
574 }
575
576 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
577 * the last close of the device, and this is necessary for cleanup when things
578 * exit uncleanly. Therefore, having userland manually remove mappings seems
579 * like a pointless exercise since they're going away anyway.
580 *
581 * One use case might be after addmap is allowed for normal users for SHM and
582 * gets used by drivers that the server doesn't need to care about. This seems
583 * unlikely.
584 *
585 * \param inode device inode.
586 * \param file_priv DRM file private.
587 * \param cmd command.
588 * \param arg pointer to a struct drm_map structure.
589 * \return zero on success or a negative value on error.
590 */
591 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
592 struct drm_file *file_priv)
593 {
594 struct drm_map *request = data;
595 struct drm_local_map *map = NULL;
596 struct drm_map_list *r_list;
597 int ret;
598
599 if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
600 !drm_core_check_feature(dev, DRIVER_LEGACY))
601 return -EINVAL;
602
603 mutex_lock(&dev->struct_mutex);
604 list_for_each_entry(r_list, &dev->maplist, head) {
605 if (r_list->map &&
606 r_list->user_token == (unsigned long)request->handle &&
607 r_list->map->flags & _DRM_REMOVABLE) {
608 map = r_list->map;
609 break;
610 }
611 }
612
613 /* List has wrapped around to the head pointer, or its empty we didn't
614 * find anything.
615 */
616 if (list_empty(&dev->maplist) || !map) {
617 mutex_unlock(&dev->struct_mutex);
618 return -EINVAL;
619 }
620
621 /* Register and framebuffer maps are permanent */
622 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
623 mutex_unlock(&dev->struct_mutex);
624 return 0;
625 }
626
627 ret = drm_legacy_rmmap_locked(dev, map);
628
629 mutex_unlock(&dev->struct_mutex);
630
631 return ret;
632 }
633
634 /**
635 * Cleanup after an error on one of the addbufs() functions.
636 *
637 * \param dev DRM device.
638 * \param entry buffer entry where the error occurred.
639 *
640 * Frees any pages and buffers associated with the given entry.
641 */
642 static void drm_cleanup_buf_error(struct drm_device *dev,
643 struct drm_buf_entry *entry)
644 {
645 int i;
646
647 if (entry->seg_count) {
648 for (i = 0; i < entry->seg_count; i++) {
649 if (entry->seglist[i]) {
650 drm_pci_free(dev, entry->seglist[i]);
651 }
652 }
653 kfree(entry->seglist);
654
655 entry->seg_count = 0;
656 }
657
658 if (entry->buf_count) {
659 for (i = 0; i < entry->buf_count; i++) {
660 kfree(entry->buflist[i].dev_private);
661 }
662 kfree(entry->buflist);
663
664 entry->buf_count = 0;
665 }
666 }
667
668 #if IS_ENABLED(CONFIG_AGP)
669 /**
670 * Add AGP buffers for DMA transfers.
671 *
672 * \param dev struct drm_device to which the buffers are to be added.
673 * \param request pointer to a struct drm_buf_desc describing the request.
674 * \return zero on success or a negative number on failure.
675 *
676 * After some sanity checks creates a drm_buf structure for each buffer and
677 * reallocates the buffer list of the same size order to accommodate the new
678 * buffers.
679 */
680 int drm_legacy_addbufs_agp(struct drm_device *dev,
681 struct drm_buf_desc *request)
682 {
683 struct drm_device_dma *dma = dev->dma;
684 struct drm_buf_entry *entry;
685 struct drm_agp_mem *agp_entry;
686 struct drm_buf *buf;
687 unsigned long offset;
688 unsigned long agp_offset;
689 int count;
690 int order;
691 int size;
692 int alignment;
693 int page_order;
694 int total;
695 int byte_count;
696 int i, valid;
697 struct drm_buf **temp_buflist;
698
699 if (!dma)
700 return -EINVAL;
701
702 count = request->count;
703 order = order_base_2(request->size);
704 size = 1 << order;
705
706 alignment = (request->flags & _DRM_PAGE_ALIGN)
707 ? PAGE_ALIGN(size) : size;
708 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
709 total = PAGE_SIZE << page_order;
710
711 byte_count = 0;
712 agp_offset = dev->agp->base + request->agp_start;
713
714 DRM_DEBUG("count: %d\n", count);
715 DRM_DEBUG("order: %d\n", order);
716 DRM_DEBUG("size: %d\n", size);
717 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
718 DRM_DEBUG("alignment: %d\n", alignment);
719 DRM_DEBUG("page_order: %d\n", page_order);
720 DRM_DEBUG("total: %d\n", total);
721
722 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
723 return -EINVAL;
724
725 /* Make sure buffers are located in AGP memory that we own */
726 valid = 0;
727 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
728 if ((agp_offset >= agp_entry->bound) &&
729 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
730 valid = 1;
731 break;
732 }
733 }
734 if (!list_empty(&dev->agp->memory) && !valid) {
735 DRM_DEBUG("zone invalid\n");
736 return -EINVAL;
737 }
738 spin_lock(&dev->buf_lock);
739 if (dev->buf_use) {
740 spin_unlock(&dev->buf_lock);
741 return -EBUSY;
742 }
743 atomic_inc(&dev->buf_alloc);
744 spin_unlock(&dev->buf_lock);
745
746 mutex_lock(&dev->struct_mutex);
747 entry = &dma->bufs[order];
748 if (entry->buf_count) {
749 mutex_unlock(&dev->struct_mutex);
750 atomic_dec(&dev->buf_alloc);
751 return -ENOMEM; /* May only call once for each order */
752 }
753
754 if (count < 0 || count > 4096) {
755 mutex_unlock(&dev->struct_mutex);
756 atomic_dec(&dev->buf_alloc);
757 return -EINVAL;
758 }
759
760 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
761 if (!entry->buflist) {
762 mutex_unlock(&dev->struct_mutex);
763 atomic_dec(&dev->buf_alloc);
764 return -ENOMEM;
765 }
766
767 entry->buf_size = size;
768 entry->page_order = page_order;
769
770 offset = 0;
771
772 while (entry->buf_count < count) {
773 buf = &entry->buflist[entry->buf_count];
774 buf->idx = dma->buf_count + entry->buf_count;
775 buf->total = alignment;
776 buf->order = order;
777 buf->used = 0;
778
779 buf->offset = (dma->byte_count + offset);
780 buf->bus_address = agp_offset + offset;
781 buf->address = (void *)(agp_offset + offset);
782 buf->next = NULL;
783 buf->waiting = 0;
784 buf->pending = 0;
785 buf->file_priv = NULL;
786
787 buf->dev_priv_size = dev->driver->dev_priv_size;
788 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
789 if (!buf->dev_private) {
790 /* Set count correctly so we free the proper amount. */
791 entry->buf_count = count;
792 drm_cleanup_buf_error(dev, entry);
793 mutex_unlock(&dev->struct_mutex);
794 atomic_dec(&dev->buf_alloc);
795 return -ENOMEM;
796 }
797
798 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
799
800 offset += alignment;
801 entry->buf_count++;
802 byte_count += PAGE_SIZE << page_order;
803 }
804
805 DRM_DEBUG("byte_count: %d\n", byte_count);
806
807 temp_buflist = krealloc(dma->buflist,
808 (dma->buf_count + entry->buf_count) *
809 sizeof(*dma->buflist), GFP_KERNEL);
810 if (!temp_buflist) {
811 /* Free the entry because it isn't valid */
812 drm_cleanup_buf_error(dev, entry);
813 mutex_unlock(&dev->struct_mutex);
814 atomic_dec(&dev->buf_alloc);
815 return -ENOMEM;
816 }
817 dma->buflist = temp_buflist;
818
819 for (i = 0; i < entry->buf_count; i++) {
820 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
821 }
822
823 dma->buf_count += entry->buf_count;
824 dma->seg_count += entry->seg_count;
825 dma->page_count += byte_count >> PAGE_SHIFT;
826 dma->byte_count += byte_count;
827
828 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
829 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
830
831 mutex_unlock(&dev->struct_mutex);
832
833 request->count = entry->buf_count;
834 request->size = size;
835
836 dma->flags = _DRM_DMA_USE_AGP;
837
838 atomic_dec(&dev->buf_alloc);
839 return 0;
840 }
841 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
842 #endif /* CONFIG_AGP */
843
844 int drm_legacy_addbufs_pci(struct drm_device *dev,
845 struct drm_buf_desc *request)
846 {
847 struct drm_device_dma *dma = dev->dma;
848 int count;
849 int order;
850 int size;
851 int total;
852 int page_order;
853 struct drm_buf_entry *entry;
854 drm_dma_handle_t *dmah;
855 struct drm_buf *buf;
856 int alignment;
857 unsigned long offset;
858 int i;
859 int byte_count;
860 int page_count;
861 unsigned long *temp_pagelist;
862 struct drm_buf **temp_buflist;
863
864 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
865 return -EINVAL;
866
867 if (!dma)
868 return -EINVAL;
869
870 if (!capable(CAP_SYS_ADMIN))
871 return -EPERM;
872
873 count = request->count;
874 order = order_base_2(request->size);
875 size = 1 << order;
876
877 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
878 request->count, request->size, size, order);
879
880 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
881 return -EINVAL;
882
883 alignment = (request->flags & _DRM_PAGE_ALIGN)
884 ? PAGE_ALIGN(size) : size;
885 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
886 total = PAGE_SIZE << page_order;
887
888 spin_lock(&dev->buf_lock);
889 if (dev->buf_use) {
890 spin_unlock(&dev->buf_lock);
891 return -EBUSY;
892 }
893 atomic_inc(&dev->buf_alloc);
894 spin_unlock(&dev->buf_lock);
895
896 mutex_lock(&dev->struct_mutex);
897 entry = &dma->bufs[order];
898 if (entry->buf_count) {
899 mutex_unlock(&dev->struct_mutex);
900 atomic_dec(&dev->buf_alloc);
901 return -ENOMEM; /* May only call once for each order */
902 }
903
904 if (count < 0 || count > 4096) {
905 mutex_unlock(&dev->struct_mutex);
906 atomic_dec(&dev->buf_alloc);
907 return -EINVAL;
908 }
909
910 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
911 if (!entry->buflist) {
912 mutex_unlock(&dev->struct_mutex);
913 atomic_dec(&dev->buf_alloc);
914 return -ENOMEM;
915 }
916
917 entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
918 if (!entry->seglist) {
919 kfree(entry->buflist);
920 mutex_unlock(&dev->struct_mutex);
921 atomic_dec(&dev->buf_alloc);
922 return -ENOMEM;
923 }
924
925 /* Keep the original pagelist until we know all the allocations
926 * have succeeded
927 */
928 temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
929 sizeof(*dma->pagelist),
930 GFP_KERNEL);
931 if (!temp_pagelist) {
932 kfree(entry->buflist);
933 kfree(entry->seglist);
934 mutex_unlock(&dev->struct_mutex);
935 atomic_dec(&dev->buf_alloc);
936 return -ENOMEM;
937 }
938 memcpy(temp_pagelist,
939 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
940 DRM_DEBUG("pagelist: %d entries\n",
941 dma->page_count + (count << page_order));
942
943 entry->buf_size = size;
944 entry->page_order = page_order;
945 byte_count = 0;
946 page_count = 0;
947
948 while (entry->buf_count < count) {
949
950 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
951
952 if (!dmah) {
953 /* Set count correctly so we free the proper amount. */
954 entry->buf_count = count;
955 entry->seg_count = count;
956 drm_cleanup_buf_error(dev, entry);
957 kfree(temp_pagelist);
958 mutex_unlock(&dev->struct_mutex);
959 atomic_dec(&dev->buf_alloc);
960 return -ENOMEM;
961 }
962 entry->seglist[entry->seg_count++] = dmah;
963 for (i = 0; i < (1 << page_order); i++) {
964 DRM_DEBUG("page %d @ 0x%08lx\n",
965 dma->page_count + page_count,
966 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
967 temp_pagelist[dma->page_count + page_count++]
968 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
969 }
970 for (offset = 0;
971 offset + size <= total && entry->buf_count < count;
972 offset += alignment, ++entry->buf_count) {
973 buf = &entry->buflist[entry->buf_count];
974 buf->idx = dma->buf_count + entry->buf_count;
975 buf->total = alignment;
976 buf->order = order;
977 buf->used = 0;
978 buf->offset = (dma->byte_count + byte_count + offset);
979 buf->address = (void *)(dmah->vaddr + offset);
980 buf->bus_address = dmah->busaddr + offset;
981 buf->next = NULL;
982 buf->waiting = 0;
983 buf->pending = 0;
984 buf->file_priv = NULL;
985
986 buf->dev_priv_size = dev->driver->dev_priv_size;
987 buf->dev_private = kzalloc(buf->dev_priv_size,
988 GFP_KERNEL);
989 if (!buf->dev_private) {
990 /* Set count correctly so we free the proper amount. */
991 entry->buf_count = count;
992 entry->seg_count = count;
993 drm_cleanup_buf_error(dev, entry);
994 kfree(temp_pagelist);
995 mutex_unlock(&dev->struct_mutex);
996 atomic_dec(&dev->buf_alloc);
997 return -ENOMEM;
998 }
999
1000 DRM_DEBUG("buffer %d @ %p\n",
1001 entry->buf_count, buf->address);
1002 }
1003 byte_count += PAGE_SIZE << page_order;
1004 }
1005
1006 temp_buflist = krealloc(dma->buflist,
1007 (dma->buf_count + entry->buf_count) *
1008 sizeof(*dma->buflist), GFP_KERNEL);
1009 if (!temp_buflist) {
1010 /* Free the entry because it isn't valid */
1011 drm_cleanup_buf_error(dev, entry);
1012 kfree(temp_pagelist);
1013 mutex_unlock(&dev->struct_mutex);
1014 atomic_dec(&dev->buf_alloc);
1015 return -ENOMEM;
1016 }
1017 dma->buflist = temp_buflist;
1018
1019 for (i = 0; i < entry->buf_count; i++) {
1020 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1021 }
1022
1023 /* No allocations failed, so now we can replace the original pagelist
1024 * with the new one.
1025 */
1026 if (dma->page_count) {
1027 kfree(dma->pagelist);
1028 }
1029 dma->pagelist = temp_pagelist;
1030
1031 dma->buf_count += entry->buf_count;
1032 dma->seg_count += entry->seg_count;
1033 dma->page_count += entry->seg_count << page_order;
1034 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1035
1036 mutex_unlock(&dev->struct_mutex);
1037
1038 request->count = entry->buf_count;
1039 request->size = size;
1040
1041 if (request->flags & _DRM_PCI_BUFFER_RO)
1042 dma->flags = _DRM_DMA_USE_PCI_RO;
1043
1044 atomic_dec(&dev->buf_alloc);
1045 return 0;
1046
1047 }
1048 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1049
1050 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1051 struct drm_buf_desc *request)
1052 {
1053 struct drm_device_dma *dma = dev->dma;
1054 struct drm_buf_entry *entry;
1055 struct drm_buf *buf;
1056 unsigned long offset;
1057 unsigned long agp_offset;
1058 int count;
1059 int order;
1060 int size;
1061 int alignment;
1062 int page_order;
1063 int total;
1064 int byte_count;
1065 int i;
1066 struct drm_buf **temp_buflist;
1067
1068 if (!drm_core_check_feature(dev, DRIVER_SG))
1069 return -EINVAL;
1070
1071 if (!dma)
1072 return -EINVAL;
1073
1074 if (!capable(CAP_SYS_ADMIN))
1075 return -EPERM;
1076
1077 count = request->count;
1078 order = order_base_2(request->size);
1079 size = 1 << order;
1080
1081 alignment = (request->flags & _DRM_PAGE_ALIGN)
1082 ? PAGE_ALIGN(size) : size;
1083 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1084 total = PAGE_SIZE << page_order;
1085
1086 byte_count = 0;
1087 agp_offset = request->agp_start;
1088
1089 DRM_DEBUG("count: %d\n", count);
1090 DRM_DEBUG("order: %d\n", order);
1091 DRM_DEBUG("size: %d\n", size);
1092 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1093 DRM_DEBUG("alignment: %d\n", alignment);
1094 DRM_DEBUG("page_order: %d\n", page_order);
1095 DRM_DEBUG("total: %d\n", total);
1096
1097 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1098 return -EINVAL;
1099
1100 spin_lock(&dev->buf_lock);
1101 if (dev->buf_use) {
1102 spin_unlock(&dev->buf_lock);
1103 return -EBUSY;
1104 }
1105 atomic_inc(&dev->buf_alloc);
1106 spin_unlock(&dev->buf_lock);
1107
1108 mutex_lock(&dev->struct_mutex);
1109 entry = &dma->bufs[order];
1110 if (entry->buf_count) {
1111 mutex_unlock(&dev->struct_mutex);
1112 atomic_dec(&dev->buf_alloc);
1113 return -ENOMEM; /* May only call once for each order */
1114 }
1115
1116 if (count < 0 || count > 4096) {
1117 mutex_unlock(&dev->struct_mutex);
1118 atomic_dec(&dev->buf_alloc);
1119 return -EINVAL;
1120 }
1121
1122 entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1123 if (!entry->buflist) {
1124 mutex_unlock(&dev->struct_mutex);
1125 atomic_dec(&dev->buf_alloc);
1126 return -ENOMEM;
1127 }
1128
1129 entry->buf_size = size;
1130 entry->page_order = page_order;
1131
1132 offset = 0;
1133
1134 while (entry->buf_count < count) {
1135 buf = &entry->buflist[entry->buf_count];
1136 buf->idx = dma->buf_count + entry->buf_count;
1137 buf->total = alignment;
1138 buf->order = order;
1139 buf->used = 0;
1140
1141 buf->offset = (dma->byte_count + offset);
1142 buf->bus_address = agp_offset + offset;
1143 buf->address = (void *)(agp_offset + offset
1144 + (unsigned long)dev->sg->virtual);
1145 buf->next = NULL;
1146 buf->waiting = 0;
1147 buf->pending = 0;
1148 buf->file_priv = NULL;
1149
1150 buf->dev_priv_size = dev->driver->dev_priv_size;
1151 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1152 if (!buf->dev_private) {
1153 /* Set count correctly so we free the proper amount. */
1154 entry->buf_count = count;
1155 drm_cleanup_buf_error(dev, entry);
1156 mutex_unlock(&dev->struct_mutex);
1157 atomic_dec(&dev->buf_alloc);
1158 return -ENOMEM;
1159 }
1160
1161 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1162
1163 offset += alignment;
1164 entry->buf_count++;
1165 byte_count += PAGE_SIZE << page_order;
1166 }
1167
1168 DRM_DEBUG("byte_count: %d\n", byte_count);
1169
1170 temp_buflist = krealloc(dma->buflist,
1171 (dma->buf_count + entry->buf_count) *
1172 sizeof(*dma->buflist), GFP_KERNEL);
1173 if (!temp_buflist) {
1174 /* Free the entry because it isn't valid */
1175 drm_cleanup_buf_error(dev, entry);
1176 mutex_unlock(&dev->struct_mutex);
1177 atomic_dec(&dev->buf_alloc);
1178 return -ENOMEM;
1179 }
1180 dma->buflist = temp_buflist;
1181
1182 for (i = 0; i < entry->buf_count; i++) {
1183 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1184 }
1185
1186 dma->buf_count += entry->buf_count;
1187 dma->seg_count += entry->seg_count;
1188 dma->page_count += byte_count >> PAGE_SHIFT;
1189 dma->byte_count += byte_count;
1190
1191 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1192 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1193
1194 mutex_unlock(&dev->struct_mutex);
1195
1196 request->count = entry->buf_count;
1197 request->size = size;
1198
1199 dma->flags = _DRM_DMA_USE_SG;
1200
1201 atomic_dec(&dev->buf_alloc);
1202 return 0;
1203 }
1204
1205 /**
1206 * Add buffers for DMA transfers (ioctl).
1207 *
1208 * \param inode device inode.
1209 * \param file_priv DRM file private.
1210 * \param cmd command.
1211 * \param arg pointer to a struct drm_buf_desc request.
1212 * \return zero on success or a negative number on failure.
1213 *
1214 * According with the memory type specified in drm_buf_desc::flags and the
1215 * build options, it dispatches the call either to addbufs_agp(),
1216 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1217 * PCI memory respectively.
1218 */
1219 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1220 struct drm_file *file_priv)
1221 {
1222 struct drm_buf_desc *request = data;
1223 int ret;
1224
1225 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1226 return -EINVAL;
1227
1228 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1229 return -EINVAL;
1230
1231 #if IS_ENABLED(CONFIG_AGP)
1232 if (request->flags & _DRM_AGP_BUFFER)
1233 ret = drm_legacy_addbufs_agp(dev, request);
1234 else
1235 #endif
1236 if (request->flags & _DRM_SG_BUFFER)
1237 ret = drm_legacy_addbufs_sg(dev, request);
1238 else if (request->flags & _DRM_FB_BUFFER)
1239 ret = -EINVAL;
1240 else
1241 ret = drm_legacy_addbufs_pci(dev, request);
1242
1243 return ret;
1244 }
1245
1246 /**
1247 * Get information about the buffer mappings.
1248 *
1249 * This was originally mean for debugging purposes, or by a sophisticated
1250 * client library to determine how best to use the available buffers (e.g.,
1251 * large buffers can be used for image transfer).
1252 *
1253 * \param inode device inode.
1254 * \param file_priv DRM file private.
1255 * \param cmd command.
1256 * \param arg pointer to a drm_buf_info structure.
1257 * \return zero on success or a negative number on failure.
1258 *
1259 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1260 * lock, preventing of allocating more buffers after this call. Information
1261 * about each requested buffer is then copied into user space.
1262 */
1263 int __drm_legacy_infobufs(struct drm_device *dev,
1264 void *data, int *p,
1265 int (*f)(void *, int, struct drm_buf_entry *))
1266 {
1267 struct drm_device_dma *dma = dev->dma;
1268 int i;
1269 int count;
1270
1271 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1272 return -EINVAL;
1273
1274 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1275 return -EINVAL;
1276
1277 if (!dma)
1278 return -EINVAL;
1279
1280 spin_lock(&dev->buf_lock);
1281 if (atomic_read(&dev->buf_alloc)) {
1282 spin_unlock(&dev->buf_lock);
1283 return -EBUSY;
1284 }
1285 ++dev->buf_use; /* Can't allocate more after this call */
1286 spin_unlock(&dev->buf_lock);
1287
1288 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1289 if (dma->bufs[i].buf_count)
1290 ++count;
1291 }
1292
1293 DRM_DEBUG("count = %d\n", count);
1294
1295 if (*p >= count) {
1296 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1297 struct drm_buf_entry *from = &dma->bufs[i];
1298 if (from->buf_count) {
1299 if (f(data, count, from) < 0)
1300 return -EFAULT;
1301 DRM_DEBUG("%d %d %d %d %d\n",
1302 i,
1303 dma->bufs[i].buf_count,
1304 dma->bufs[i].buf_size,
1305 dma->bufs[i].low_mark,
1306 dma->bufs[i].high_mark);
1307 ++count;
1308 }
1309 }
1310 }
1311 *p = count;
1312
1313 return 0;
1314 }
1315
1316 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1317 {
1318 struct drm_buf_info *request = data;
1319 struct drm_buf_desc __user *to = &request->list[count];
1320 struct drm_buf_desc v = {.count = from->buf_count,
1321 .size = from->buf_size,
1322 .low_mark = from->low_mark,
1323 .high_mark = from->high_mark};
1324
1325 if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1326 return -EFAULT;
1327 return 0;
1328 }
1329
1330 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1331 struct drm_file *file_priv)
1332 {
1333 struct drm_buf_info *request = data;
1334 return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1335 }
1336
1337 /**
1338 * Specifies a low and high water mark for buffer allocation
1339 *
1340 * \param inode device inode.
1341 * \param file_priv DRM file private.
1342 * \param cmd command.
1343 * \param arg a pointer to a drm_buf_desc structure.
1344 * \return zero on success or a negative number on failure.
1345 *
1346 * Verifies that the size order is bounded between the admissible orders and
1347 * updates the respective drm_device_dma::bufs entry low and high water mark.
1348 *
1349 * \note This ioctl is deprecated and mostly never used.
1350 */
1351 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1352 struct drm_file *file_priv)
1353 {
1354 struct drm_device_dma *dma = dev->dma;
1355 struct drm_buf_desc *request = data;
1356 int order;
1357 struct drm_buf_entry *entry;
1358
1359 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1360 return -EINVAL;
1361
1362 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1363 return -EINVAL;
1364
1365 if (!dma)
1366 return -EINVAL;
1367
1368 DRM_DEBUG("%d, %d, %d\n",
1369 request->size, request->low_mark, request->high_mark);
1370 order = order_base_2(request->size);
1371 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1372 return -EINVAL;
1373 entry = &dma->bufs[order];
1374
1375 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1376 return -EINVAL;
1377 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1378 return -EINVAL;
1379
1380 entry->low_mark = request->low_mark;
1381 entry->high_mark = request->high_mark;
1382
1383 return 0;
1384 }
1385
1386 /**
1387 * Unreserve the buffers in list, previously reserved using drmDMA.
1388 *
1389 * \param inode device inode.
1390 * \param file_priv DRM file private.
1391 * \param cmd command.
1392 * \param arg pointer to a drm_buf_free structure.
1393 * \return zero on success or a negative number on failure.
1394 *
1395 * Calls free_buffer() for each used buffer.
1396 * This function is primarily used for debugging.
1397 */
1398 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1399 struct drm_file *file_priv)
1400 {
1401 struct drm_device_dma *dma = dev->dma;
1402 struct drm_buf_free *request = data;
1403 int i;
1404 int idx;
1405 struct drm_buf *buf;
1406
1407 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1408 return -EINVAL;
1409
1410 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1411 return -EINVAL;
1412
1413 if (!dma)
1414 return -EINVAL;
1415
1416 DRM_DEBUG("%d\n", request->count);
1417 for (i = 0; i < request->count; i++) {
1418 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1419 return -EFAULT;
1420 if (idx < 0 || idx >= dma->buf_count) {
1421 DRM_ERROR("Index %d (of %d max)\n",
1422 idx, dma->buf_count - 1);
1423 return -EINVAL;
1424 }
1425 idx = array_index_nospec(idx, dma->buf_count);
1426 buf = dma->buflist[idx];
1427 if (buf->file_priv != file_priv) {
1428 DRM_ERROR("Process %d freeing buffer not owned\n",
1429 task_pid_nr(current));
1430 return -EINVAL;
1431 }
1432 drm_legacy_free_buffer(dev, buf);
1433 }
1434
1435 return 0;
1436 }
1437
1438 /**
1439 * Maps all of the DMA buffers into client-virtual space (ioctl).
1440 *
1441 * \param inode device inode.
1442 * \param file_priv DRM file private.
1443 * \param cmd command.
1444 * \param arg pointer to a drm_buf_map structure.
1445 * \return zero on success or a negative number on failure.
1446 *
1447 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1448 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1449 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1450 * drm_mmap_dma().
1451 */
1452 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1453 void __user **v,
1454 int (*f)(void *, int, unsigned long,
1455 struct drm_buf *),
1456 struct drm_file *file_priv)
1457 {
1458 struct drm_device_dma *dma = dev->dma;
1459 int retcode = 0;
1460 unsigned long virtual;
1461 int i;
1462
1463 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1464 return -EINVAL;
1465
1466 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1467 return -EINVAL;
1468
1469 if (!dma)
1470 return -EINVAL;
1471
1472 spin_lock(&dev->buf_lock);
1473 if (atomic_read(&dev->buf_alloc)) {
1474 spin_unlock(&dev->buf_lock);
1475 return -EBUSY;
1476 }
1477 dev->buf_use++; /* Can't allocate more after this call */
1478 spin_unlock(&dev->buf_lock);
1479
1480 if (*p >= dma->buf_count) {
1481 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1482 || (drm_core_check_feature(dev, DRIVER_SG)
1483 && (dma->flags & _DRM_DMA_USE_SG))) {
1484 struct drm_local_map *map = dev->agp_buffer_map;
1485 unsigned long token = dev->agp_buffer_token;
1486
1487 if (!map) {
1488 retcode = -EINVAL;
1489 goto done;
1490 }
1491 virtual = vm_mmap(file_priv->filp, 0, map->size,
1492 PROT_READ | PROT_WRITE,
1493 MAP_SHARED,
1494 token);
1495 } else {
1496 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1497 PROT_READ | PROT_WRITE,
1498 MAP_SHARED, 0);
1499 }
1500 if (virtual > -1024UL) {
1501 /* Real error */
1502 retcode = (signed long)virtual;
1503 goto done;
1504 }
1505 *v = (void __user *)virtual;
1506
1507 for (i = 0; i < dma->buf_count; i++) {
1508 if (f(data, i, virtual, dma->buflist[i]) < 0) {
1509 retcode = -EFAULT;
1510 goto done;
1511 }
1512 }
1513 }
1514 done:
1515 *p = dma->buf_count;
1516 DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1517
1518 return retcode;
1519 }
1520
1521 static int map_one_buf(void *data, int idx, unsigned long virtual,
1522 struct drm_buf *buf)
1523 {
1524 struct drm_buf_map *request = data;
1525 unsigned long address = virtual + buf->offset; /* *** */
1526
1527 if (copy_to_user(&request->list[idx].idx, &buf->idx,
1528 sizeof(request->list[0].idx)))
1529 return -EFAULT;
1530 if (copy_to_user(&request->list[idx].total, &buf->total,
1531 sizeof(request->list[0].total)))
1532 return -EFAULT;
1533 if (clear_user(&request->list[idx].used, sizeof(int)))
1534 return -EFAULT;
1535 if (copy_to_user(&request->list[idx].address, &address,
1536 sizeof(address)))
1537 return -EFAULT;
1538 return 0;
1539 }
1540
1541 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1542 struct drm_file *file_priv)
1543 {
1544 struct drm_buf_map *request = data;
1545 return __drm_legacy_mapbufs(dev, data, &request->count,
1546 &request->virtual, map_one_buf,
1547 file_priv);
1548 }
1549
1550 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1551 struct drm_file *file_priv)
1552 {
1553 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1554 return -EINVAL;
1555
1556 if (dev->driver->dma_ioctl)
1557 return dev->driver->dma_ioctl(dev, data, file_priv);
1558 else
1559 return -EINVAL;
1560 }
1561
1562 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1563 {
1564 struct drm_map_list *entry;
1565
1566 list_for_each_entry(entry, &dev->maplist, head) {
1567 if (entry->map && entry->map->type == _DRM_SHM &&
1568 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1569 return entry->map;
1570 }
1571 }
1572 return NULL;
1573 }
1574 EXPORT_SYMBOL(drm_legacy_getsarea);
Linux with added FPC-III support