forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
drm_bufs.c
1554 lines (1359 loc) · 40.8 KB
/
drm_bufs.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Legacy: Generic DRM Buffer Management
*
* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Author: Rickard E. (Rik) Faith <[email protected]>
* Author: Gareth Hughes <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/log2.h>
#include <linux/export.h>
#include <asm/shmparam.h>
#include <drm/drmP.h>
#include "drm_legacy.h"
static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
struct drm_local_map *map)
{
struct drm_map_list *entry;
list_for_each_entry(entry, &dev->maplist, head) {
/*
* Because the kernel-userspace ABI is fixed at a 32-bit offset
* while PCI resources may live above that, we only compare the
* lower 32 bits of the map offset for maps of type
* _DRM_FRAMEBUFFER or _DRM_REGISTERS.
* It is assumed that if a driver have more than one resource
* of each type, the lower 32 bits are different.
*/
if (!entry->map ||
map->type != entry->map->type ||
entry->master != dev->master)
continue;
switch (map->type) {
case _DRM_SHM:
if (map->flags != _DRM_CONTAINS_LOCK)
break;
return entry;
case _DRM_REGISTERS:
case _DRM_FRAME_BUFFER:
if ((entry->map->offset & 0xffffffff) ==
(map->offset & 0xffffffff))
return entry;
default: /* Make gcc happy */
;
}
if (entry->map->offset == map->offset)
return entry;
}
return NULL;
}
static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
unsigned long user_token, int hashed_handle, int shm)
{
int use_hashed_handle, shift;
unsigned long add;
#if (BITS_PER_LONG == 64)
use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
#elif (BITS_PER_LONG == 32)
use_hashed_handle = hashed_handle;
#else
#error Unsupported long size. Neither 64 nor 32 bits.
#endif
if (!use_hashed_handle) {
int ret;
hash->key = user_token >> PAGE_SHIFT;
ret = drm_ht_insert_item(&dev->map_hash, hash);
if (ret != -EINVAL)
return ret;
}
shift = 0;
add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
if (shm && (SHMLBA > PAGE_SIZE)) {
int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
/* For shared memory, we have to preserve the SHMLBA
* bits of the eventual vma->vm_pgoff value during
* mmap(). Otherwise we run into cache aliasing problems
* on some platforms. On these platforms, the pgoff of
* a mmap() request is used to pick a suitable virtual
* address for the mmap() region such that it will not
* cause cache aliasing problems.
*
* Therefore, make sure the SHMLBA relevant bits of the
* hash value we use are equal to those in the original
* kernel virtual address.
*/
shift = bits;
add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
}
return drm_ht_just_insert_please(&dev->map_hash, hash,
user_token, 32 - PAGE_SHIFT - 3,
shift, add);
}
/**
* Core function to create a range of memory available for mapping by a
* non-root process.
*
* Adjusts the memory offset to its absolute value according to the mapping
* type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
* applicable and if supported by the kernel.
*/
static int 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)
{
struct drm_local_map *map;
struct drm_map_list *list;
drm_dma_handle_t *dmah;
unsigned long user_token;
int ret;
map = kmalloc(sizeof(*map), GFP_KERNEL);
if (!map)
return -ENOMEM;
map->offset = offset;
map->size = size;
map->flags = flags;
map->type = type;
/* Only allow shared memory to be removable since we only keep enough
* book keeping information about shared memory to allow for removal
* when processes fork.
*/
if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
kfree(map);
return -EINVAL;
}
DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
(unsigned long long)map->offset, map->size, map->type);
/* page-align _DRM_SHM maps. They are allocated here so there is no security
* hole created by that and it works around various broken drivers that use
* a non-aligned quantity to map the SAREA. --BenH
*/
if (map->type == _DRM_SHM)
map->size = PAGE_ALIGN(map->size);
if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
kfree(map);
return -EINVAL;
}
map->mtrr = -1;
map->handle = NULL;
switch (map->type) {
case _DRM_REGISTERS:
case _DRM_FRAME_BUFFER:
#if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
if (map->offset + (map->size-1) < map->offset ||
map->offset < virt_to_phys(high_memory)) {
kfree(map);
return -EINVAL;
}
#endif
/* Some drivers preinitialize some maps, without the X Server
* needing to be aware of it. Therefore, we just return success
* when the server tries to create a duplicate map.
*/
list = drm_find_matching_map(dev, map);
if (list != NULL) {
if (list->map->size != map->size) {
DRM_DEBUG("Matching maps of type %d with "
"mismatched sizes, (%ld vs %ld)\n",
map->type, map->size,
list->map->size);
list->map->size = map->size;
}
kfree(map);
*maplist = list;
return 0;
}
if (map->type == _DRM_FRAME_BUFFER ||
(map->flags & _DRM_WRITE_COMBINING)) {
map->mtrr =
arch_phys_wc_add(map->offset, map->size);
}
if (map->type == _DRM_REGISTERS) {
if (map->flags & _DRM_WRITE_COMBINING)
map->handle = ioremap_wc(map->offset,
map->size);
else
map->handle = ioremap(map->offset, map->size);
if (!map->handle) {
kfree(map);
return -ENOMEM;
}
}
break;
case _DRM_SHM:
list = drm_find_matching_map(dev, map);
if (list != NULL) {
if(list->map->size != map->size) {
DRM_DEBUG("Matching maps of type %d with "
"mismatched sizes, (%ld vs %ld)\n",
map->type, map->size, list->map->size);
list->map->size = map->size;
}
kfree(map);
*maplist = list;
return 0;
}
map->handle = vmalloc_user(map->size);
DRM_DEBUG("%lu %d %p\n",
map->size, order_base_2(map->size), map->handle);
if (!map->handle) {
kfree(map);
return -ENOMEM;
}
map->offset = (unsigned long)map->handle;
if (map->flags & _DRM_CONTAINS_LOCK) {
/* Prevent a 2nd X Server from creating a 2nd lock */
if (dev->master->lock.hw_lock != NULL) {
vfree(map->handle);
kfree(map);
return -EBUSY;
}
dev->sigdata.lock = dev->master->lock.hw_lock = map->handle; /* Pointer to lock */
}
break;
case _DRM_AGP: {
struct drm_agp_mem *entry;
int valid = 0;
if (!dev->agp) {
kfree(map);
return -EINVAL;
}
#ifdef __alpha__
map->offset += dev->hose->mem_space->start;
#endif
/* In some cases (i810 driver), user space may have already
* added the AGP base itself, because dev->agp->base previously
* only got set during AGP enable. So, only add the base
* address if the map's offset isn't already within the
* aperture.
*/
if (map->offset < dev->agp->base ||
map->offset > dev->agp->base +
dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
map->offset += dev->agp->base;
}
map->mtrr = dev->agp->agp_mtrr; /* for getmap */
/* This assumes the DRM is in total control of AGP space.
* It's not always the case as AGP can be in the control
* of user space (i.e. i810 driver). So this loop will get
* skipped and we double check that dev->agp->memory is
* actually set as well as being invalid before EPERM'ing
*/
list_for_each_entry(entry, &dev->agp->memory, head) {
if ((map->offset >= entry->bound) &&
(map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
valid = 1;
break;
}
}
if (!list_empty(&dev->agp->memory) && !valid) {
kfree(map);
return -EPERM;
}
DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
(unsigned long long)map->offset, map->size);
break;
}
case _DRM_SCATTER_GATHER:
if (!dev->sg) {
kfree(map);
return -EINVAL;
}
map->offset += (unsigned long)dev->sg->virtual;
break;
case _DRM_CONSISTENT:
/* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
* As we're limiting the address to 2^32-1 (or less),
* casting it down to 32 bits is no problem, but we
* need to point to a 64bit variable first. */
dmah = drm_pci_alloc(dev, map->size, map->size);
if (!dmah) {
kfree(map);
return -ENOMEM;
}
map->handle = dmah->vaddr;
map->offset = (unsigned long)dmah->busaddr;
kfree(dmah);
break;
default:
kfree(map);
return -EINVAL;
}
list = kzalloc(sizeof(*list), GFP_KERNEL);
if (!list) {
if (map->type == _DRM_REGISTERS)
iounmap(map->handle);
kfree(map);
return -EINVAL;
}
list->map = map;
mutex_lock(&dev->struct_mutex);
list_add(&list->head, &dev->maplist);
/* Assign a 32-bit handle */
/* We do it here so that dev->struct_mutex protects the increment */
user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
map->offset;
ret = drm_map_handle(dev, &list->hash, user_token, 0,
(map->type == _DRM_SHM));
if (ret) {
if (map->type == _DRM_REGISTERS)
iounmap(map->handle);
kfree(map);
kfree(list);
mutex_unlock(&dev->struct_mutex);
return ret;
}
list->user_token = list->hash.key << PAGE_SHIFT;
mutex_unlock(&dev->struct_mutex);
if (!(map->flags & _DRM_DRIVER))
list->master = dev->master;
*maplist = list;
return 0;
}
int 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)
{
struct drm_map_list *list;
int rc;
rc = drm_addmap_core(dev, offset, size, type, flags, &list);
if (!rc)
*map_ptr = list->map;
return rc;
}
EXPORT_SYMBOL(drm_legacy_addmap);
/**
* Ioctl to specify a range of memory that is available for mapping by a
* non-root process.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg pointer to a drm_map structure.
* \return zero on success or a negative value on error.
*
*/
int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_map *map = data;
struct drm_map_list *maplist;
int err;
if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
return -EPERM;
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
!drm_core_check_feature(dev, DRIVER_LEGACY))
return -EINVAL;
err = drm_addmap_core(dev, map->offset, map->size, map->type,
map->flags, &maplist);
if (err)
return err;
/* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
map->handle = (void *)(unsigned long)maplist->user_token;
/*
* It appears that there are no users of this value whatsoever --
* drmAddMap just discards it. Let's not encourage its use.
* (Keeping drm_addmap_core's returned mtrr value would be wrong --
* it's not a real mtrr index anymore.)
*/
map->mtrr = -1;
return 0;
}
/*
* Get a mapping information.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_map structure.
*
* \return zero on success or a negative number on failure.
*
* Searches for the mapping with the specified offset and copies its information
* into userspace
*/
int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_map *map = data;
struct drm_map_list *r_list = NULL;
struct list_head *list;
int idx;
int i;
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
!drm_core_check_feature(dev, DRIVER_LEGACY))
return -EINVAL;
idx = map->offset;
if (idx < 0)
return -EINVAL;
i = 0;
mutex_lock(&dev->struct_mutex);
list_for_each(list, &dev->maplist) {
if (i == idx) {
r_list = list_entry(list, struct drm_map_list, head);
break;
}
i++;
}
if (!r_list || !r_list->map) {
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
map->offset = r_list->map->offset;
map->size = r_list->map->size;
map->type = r_list->map->type;
map->flags = r_list->map->flags;
map->handle = (void *)(unsigned long) r_list->user_token;
map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
mutex_unlock(&dev->struct_mutex);
return 0;
}
/**
* Remove a map private from list and deallocate resources if the mapping
* isn't in use.
*
* Searches the map on drm_device::maplist, removes it from the list, see if
* its being used, and free any associate resource (such as MTRR's) if it's not
* being on use.
*
* \sa drm_legacy_addmap
*/
int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
{
struct drm_map_list *r_list = NULL, *list_t;
drm_dma_handle_t dmah;
int found = 0;
struct drm_master *master;
/* Find the list entry for the map and remove it */
list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
if (r_list->map == map) {
master = r_list->master;
list_del(&r_list->head);
drm_ht_remove_key(&dev->map_hash,
r_list->user_token >> PAGE_SHIFT);
kfree(r_list);
found = 1;
break;
}
}
if (!found)
return -EINVAL;
switch (map->type) {
case _DRM_REGISTERS:
iounmap(map->handle);
/* FALLTHROUGH */
case _DRM_FRAME_BUFFER:
arch_phys_wc_del(map->mtrr);
break;
case _DRM_SHM:
vfree(map->handle);
if (master) {
if (dev->sigdata.lock == master->lock.hw_lock)
dev->sigdata.lock = NULL;
master->lock.hw_lock = NULL; /* SHM removed */
master->lock.file_priv = NULL;
wake_up_interruptible_all(&master->lock.lock_queue);
}
break;
case _DRM_AGP:
case _DRM_SCATTER_GATHER:
break;
case _DRM_CONSISTENT:
dmah.vaddr = map->handle;
dmah.busaddr = map->offset;
dmah.size = map->size;
__drm_legacy_pci_free(dev, &dmah);
break;
}
kfree(map);
return 0;
}
EXPORT_SYMBOL(drm_legacy_rmmap_locked);
void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
{
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
!drm_core_check_feature(dev, DRIVER_LEGACY))
return;
mutex_lock(&dev->struct_mutex);
drm_legacy_rmmap_locked(dev, map);
mutex_unlock(&dev->struct_mutex);
}
EXPORT_SYMBOL(drm_legacy_rmmap);
void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
{
struct drm_map_list *r_list, *list_temp;
if (!drm_core_check_feature(dev, DRIVER_LEGACY))
return;
mutex_lock(&dev->struct_mutex);
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
if (r_list->master == master) {
drm_legacy_rmmap_locked(dev, r_list->map);
r_list = NULL;
}
}
mutex_unlock(&dev->struct_mutex);
}
/* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
* the last close of the device, and this is necessary for cleanup when things
* exit uncleanly. Therefore, having userland manually remove mappings seems
* like a pointless exercise since they're going away anyway.
*
* One use case might be after addmap is allowed for normal users for SHM and
* gets used by drivers that the server doesn't need to care about. This seems
* unlikely.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg pointer to a struct drm_map structure.
* \return zero on success or a negative value on error.
*/
int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_map *request = data;
struct drm_local_map *map = NULL;
struct drm_map_list *r_list;
int ret;
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
!drm_core_check_feature(dev, DRIVER_LEGACY))
return -EINVAL;
mutex_lock(&dev->struct_mutex);
list_for_each_entry(r_list, &dev->maplist, head) {
if (r_list->map &&
r_list->user_token == (unsigned long)request->handle &&
r_list->map->flags & _DRM_REMOVABLE) {
map = r_list->map;
break;
}
}
/* List has wrapped around to the head pointer, or its empty we didn't
* find anything.
*/
if (list_empty(&dev->maplist) || !map) {
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
/* Register and framebuffer maps are permanent */
if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
mutex_unlock(&dev->struct_mutex);
return 0;
}
ret = drm_legacy_rmmap_locked(dev, map);
mutex_unlock(&dev->struct_mutex);
return ret;
}
/**
* Cleanup after an error on one of the addbufs() functions.
*
* \param dev DRM device.
* \param entry buffer entry where the error occurred.
*
* Frees any pages and buffers associated with the given entry.
*/
static void drm_cleanup_buf_error(struct drm_device * dev,
struct drm_buf_entry * entry)
{
int i;
if (entry->seg_count) {
for (i = 0; i < entry->seg_count; i++) {
if (entry->seglist[i]) {
drm_pci_free(dev, entry->seglist[i]);
}
}
kfree(entry->seglist);
entry->seg_count = 0;
}
if (entry->buf_count) {
for (i = 0; i < entry->buf_count; i++) {
kfree(entry->buflist[i].dev_private);
}
kfree(entry->buflist);
entry->buf_count = 0;
}
}
#if IS_ENABLED(CONFIG_AGP)
/**
* Add AGP buffers for DMA transfers.
*
* \param dev struct drm_device to which the buffers are to be added.
* \param request pointer to a struct drm_buf_desc describing the request.
* \return zero on success or a negative number on failure.
*
* After some sanity checks creates a drm_buf structure for each buffer and
* reallocates the buffer list of the same size order to accommodate the new
* buffers.
*/
int drm_legacy_addbufs_agp(struct drm_device *dev,
struct drm_buf_desc *request)
{
struct drm_device_dma *dma = dev->dma;
struct drm_buf_entry *entry;
struct drm_agp_mem *agp_entry;
struct drm_buf *buf;
unsigned long offset;
unsigned long agp_offset;
int count;
int order;
int size;
int alignment;
int page_order;
int total;
int byte_count;
int i, valid;
struct drm_buf **temp_buflist;
if (!dma)
return -EINVAL;
count = request->count;
order = order_base_2(request->size);
size = 1 << order;
alignment = (request->flags & _DRM_PAGE_ALIGN)
? PAGE_ALIGN(size) : size;
page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
total = PAGE_SIZE << page_order;
byte_count = 0;
agp_offset = dev->agp->base + request->agp_start;
DRM_DEBUG("count: %d\n", count);
DRM_DEBUG("order: %d\n", order);
DRM_DEBUG("size: %d\n", size);
DRM_DEBUG("agp_offset: %lx\n", agp_offset);
DRM_DEBUG("alignment: %d\n", alignment);
DRM_DEBUG("page_order: %d\n", page_order);
DRM_DEBUG("total: %d\n", total);
if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
return -EINVAL;
/* Make sure buffers are located in AGP memory that we own */
valid = 0;
list_for_each_entry(agp_entry, &dev->agp->memory, head) {
if ((agp_offset >= agp_entry->bound) &&
(agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
valid = 1;
break;
}
}
if (!list_empty(&dev->agp->memory) && !valid) {
DRM_DEBUG("zone invalid\n");
return -EINVAL;
}
spin_lock(&dev->buf_lock);
if (dev->buf_use) {
spin_unlock(&dev->buf_lock);
return -EBUSY;
}
atomic_inc(&dev->buf_alloc);
spin_unlock(&dev->buf_lock);
mutex_lock(&dev->struct_mutex);
entry = &dma->bufs[order];
if (entry->buf_count) {
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM; /* May only call once for each order */
}
if (count < 0 || count > 4096) {
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -EINVAL;
}
entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
if (!entry->buflist) {
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
entry->buf_size = size;
entry->page_order = page_order;
offset = 0;
while (entry->buf_count < count) {
buf = &entry->buflist[entry->buf_count];
buf->idx = dma->buf_count + entry->buf_count;
buf->total = alignment;
buf->order = order;
buf->used = 0;
buf->offset = (dma->byte_count + offset);
buf->bus_address = agp_offset + offset;
buf->address = (void *)(agp_offset + offset);
buf->next = NULL;
buf->waiting = 0;
buf->pending = 0;
buf->file_priv = NULL;
buf->dev_priv_size = dev->driver->dev_priv_size;
buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
if (!buf->dev_private) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
drm_cleanup_buf_error(dev, entry);
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
offset += alignment;
entry->buf_count++;
byte_count += PAGE_SIZE << page_order;
}
DRM_DEBUG("byte_count: %d\n", byte_count);
temp_buflist = krealloc(dma->buflist,
(dma->buf_count + entry->buf_count) *
sizeof(*dma->buflist), GFP_KERNEL);
if (!temp_buflist) {
/* Free the entry because it isn't valid */
drm_cleanup_buf_error(dev, entry);
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
dma->buflist = temp_buflist;
for (i = 0; i < entry->buf_count; i++) {
dma->buflist[i + dma->buf_count] = &entry->buflist[i];
}
dma->buf_count += entry->buf_count;
dma->seg_count += entry->seg_count;
dma->page_count += byte_count >> PAGE_SHIFT;
dma->byte_count += byte_count;
DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
mutex_unlock(&dev->struct_mutex);
request->count = entry->buf_count;
request->size = size;
dma->flags = _DRM_DMA_USE_AGP;
atomic_dec(&dev->buf_alloc);
return 0;
}
EXPORT_SYMBOL(drm_legacy_addbufs_agp);
#endif /* CONFIG_AGP */
int drm_legacy_addbufs_pci(struct drm_device *dev,
struct drm_buf_desc *request)
{
struct drm_device_dma *dma = dev->dma;
int count;
int order;
int size;
int total;
int page_order;
struct drm_buf_entry *entry;
drm_dma_handle_t *dmah;
struct drm_buf *buf;
int alignment;
unsigned long offset;
int i;
int byte_count;
int page_count;
unsigned long *temp_pagelist;
struct drm_buf **temp_buflist;
if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
return -EINVAL;
if (!dma)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
count = request->count;
order = order_base_2(request->size);
size = 1 << order;
DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
request->count, request->size, size, order);
if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
return -EINVAL;
alignment = (request->flags & _DRM_PAGE_ALIGN)
? PAGE_ALIGN(size) : size;
page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
total = PAGE_SIZE << page_order;
spin_lock(&dev->buf_lock);
if (dev->buf_use) {
spin_unlock(&dev->buf_lock);
return -EBUSY;
}
atomic_inc(&dev->buf_alloc);
spin_unlock(&dev->buf_lock);
mutex_lock(&dev->struct_mutex);
entry = &dma->bufs[order];
if (entry->buf_count) {
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM; /* May only call once for each order */
}
if (count < 0 || count > 4096) {
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -EINVAL;
}
entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
if (!entry->buflist) {
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
if (!entry->seglist) {
kfree(entry->buflist);
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
/* Keep the original pagelist until we know all the allocations
* have succeeded
*/
temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
sizeof(*dma->pagelist),
GFP_KERNEL);
if (!temp_pagelist) {
kfree(entry->buflist);
kfree(entry->seglist);
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
memcpy(temp_pagelist,
dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
DRM_DEBUG("pagelist: %d entries\n",
dma->page_count + (count << page_order));
entry->buf_size = size;
entry->page_order = page_order;
byte_count = 0;
page_count = 0;
while (entry->buf_count < count) {
dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
if (!dmah) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
entry->seg_count = count;
drm_cleanup_buf_error(dev, entry);
kfree(temp_pagelist);
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
entry->seglist[entry->seg_count++] = dmah;
for (i = 0; i < (1 << page_order); i++) {
DRM_DEBUG("page %d @ 0x%08lx\n",
dma->page_count + page_count,
(unsigned long)dmah->vaddr + PAGE_SIZE * i);
temp_pagelist[dma->page_count + page_count++]
= (unsigned long)dmah->vaddr + PAGE_SIZE * i;
}
for (offset = 0;
offset + size <= total && entry->buf_count < count;
offset += alignment, ++entry->buf_count) {
buf = &entry->buflist[entry->buf_count];
buf->idx = dma->buf_count + entry->buf_count;
buf->total = alignment;
buf->order = order;
buf->used = 0;
buf->offset = (dma->byte_count + byte_count + offset);
buf->address = (void *)(dmah->vaddr + offset);
buf->bus_address = dmah->busaddr + offset;
buf->next = NULL;
buf->waiting = 0;
buf->pending = 0;
buf->file_priv = NULL;
buf->dev_priv_size = dev->driver->dev_priv_size;
buf->dev_private = kzalloc(buf->dev_priv_size,
GFP_KERNEL);
if (!buf->dev_private) {
/* Set count correctly so we free the proper amount. */
entry->buf_count = count;
entry->seg_count = count;
drm_cleanup_buf_error(dev, entry);
kfree(temp_pagelist);
mutex_unlock(&dev->struct_mutex);
atomic_dec(&dev->buf_alloc);
return -ENOMEM;
}
DRM_DEBUG("buffer %d @ %p\n",
entry->buf_count, buf->address);
}