aboutsummaryrefslogtreecommitdiff
path: root/bsd-core/drm_bufs.c
blob: 0e3fc1fd608ca0c974435b7ec8b401ae67068be1 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
/* drm_bufs.h -- Generic buffer template -*- linux-c -*-
 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
 */
/*-
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * 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.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 *
 */

#include "dev/pci/pcireg.h"

#include "drmP.h"

/*
 * Compute order.  Can be made faster.
 */
int drm_order(unsigned long size)
{
	int order;
	unsigned long tmp;

	for ( order = 0, tmp = size ; tmp >>= 1 ; ++order );

	if ( size & ~(1 << order) )
		++order;

	return order;
}

/* Allocation of PCI memory resources (framebuffer, registers, etc.) for
 * drm_get_resource_*.  Note that they are not RF_ACTIVE, so there's no virtual
 * address for accessing them.  Cleaned up at lastclose.
 */
static int drm_alloc_resource(drm_device_t *dev, int resource)
{
	if (resource >= DRM_MAX_PCI_RESOURCE) {
		DRM_ERROR("Resource %d too large\n", resource);
		return 1;
	}
	if (dev->pcir[resource] != NULL)
		return 0;

	dev->pcirid[resource] = PCIR_BAR(resource);
	dev->pcir[resource] = bus_alloc_resource_any(dev->device,
	    SYS_RES_MEMORY, &dev->pcirid[resource], RF_SHAREABLE);

	if (dev->pcir[resource] == NULL) {
		DRM_ERROR("Couldn't find resource 0x%x\n", resource);
		return 1;
	}

	return 0;
}

unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource)
{
	if (drm_alloc_resource(dev, resource) != 0)
		return 0;

	return rman_get_start(dev->pcir[resource]);
}

unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource)
{
	if (drm_alloc_resource(dev, resource) != 0)
		return 0;

	return rman_get_size(dev->pcir[resource]);
}

int drm_addmap(drm_device_t * dev, unsigned long offset, unsigned long size,
    drm_map_type_t type, drm_map_flags_t flags, drm_local_map_t **map_ptr)
{
	drm_local_map_t *map;
	int align;
	/*drm_agp_mem_t *entry;
	int valid;*/

	/* 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 ((flags & _DRM_REMOVABLE) && type != _DRM_SHM) {
		DRM_ERROR("Requested removable map for non-DRM_SHM\n");
		return EINVAL;
	}
	if ((offset & PAGE_MASK) || (size & PAGE_MASK)) {
		DRM_ERROR("offset/size not page aligned: 0x%lx/0x%lx\n",
		    offset, size);
		return EINVAL;
	}
	if (offset + size < offset) {
		DRM_ERROR("offset and size wrap around: 0x%lx/0x%lx\n",
		    offset, size);
		return EINVAL;
	}

	DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n", offset,
	    size, type);

	/* Check if this is just another version of a kernel-allocated map, and
	 * just hand that back if so.
	 */
	if (type == _DRM_REGISTERS || type == _DRM_FRAME_BUFFER ||
	    type == _DRM_SHM) {
		DRM_LOCK();
		TAILQ_FOREACH(map, &dev->maplist, link) {
			if (map->type == type &&
			    (map->offset == offset || map->type == _DRM_SHM)) {
				map->size = size;
				DRM_DEBUG("Found kernel map %d\n", type);
				goto done;
			}
		}
		DRM_UNLOCK();
	}

	/* Allocate a new map structure, fill it in, and do any type-specific
	 * initialization necessary.
	 */
	map = malloc(sizeof(*map), M_DRM, M_ZERO | M_NOWAIT);
	if ( !map )
		return DRM_ERR(ENOMEM);

	map->offset = offset;
	map->size = size;
	map->type = type;
	map->flags = flags;

	switch ( map->type ) {
	case _DRM_REGISTERS:
		map->handle = drm_ioremap(dev, map);
		if (!(map->flags & _DRM_WRITE_COMBINING))
			break;
		/* FALLTHROUGH */
	case _DRM_FRAME_BUFFER:
		if (drm_mtrr_add(map->offset, map->size, DRM_MTRR_WC) == 0)
			map->mtrr = 1;
		break;
	case _DRM_SHM:
		map->handle = malloc(map->size, M_DRM, M_NOWAIT);
		DRM_DEBUG( "%lu %d %p\n",
			   map->size, drm_order(map->size), map->handle );
		if ( !map->handle ) {
			free(map, M_DRM);
			return DRM_ERR(ENOMEM);
		}
		map->offset = (unsigned long)map->handle;
		if ( map->flags & _DRM_CONTAINS_LOCK ) {
			/* Prevent a 2nd X Server from creating a 2nd lock */
			DRM_LOCK();
			if (dev->lock.hw_lock != NULL) {
				DRM_UNLOCK();
				free(map->handle, M_DRM);
				free(map, M_DRM);
				return DRM_ERR(EBUSY);
			}
			dev->lock.hw_lock = map->handle; /* Pointer to lock */
			DRM_UNLOCK();
		}
		break;
	case _DRM_AGP:
		/*valid = 0;*/
		map->offset += dev->agp->base;
		map->mtrr   = dev->agp->mtrr; /* for getmap */
		/*for (entry = dev->agp->memory; entry; entry = entry->next) {
			if ((map->offset >= entry->bound) &&
			    (map->offset + map->size <=
			    entry->bound + entry->pages * PAGE_SIZE)) {
				valid = 1;
				break;
			}
		}
		if (!valid) {
			free(map, M_DRM);
			return DRM_ERR(EACCES);
		}*/
		break;
	case _DRM_SCATTER_GATHER:
		if (!dev->sg) {
			free(map, M_DRM);
			return DRM_ERR(EINVAL);
		}
		map->offset = map->offset + dev->sg->handle;
		break;
	case _DRM_CONSISTENT:
		/* Unfortunately, we don't get any alignment specification from
		 * the caller, so we have to guess.  drm_pci_alloc requires
		 * a power-of-two alignment, so try to align the bus address of
		 * the map to it size if possible, otherwise just assume
		 * PAGE_SIZE alignment.
		 */
		align = map->size;
		if ((align & (align - 1)) != 0)
			align = PAGE_SIZE;
		map->dmah = drm_pci_alloc(dev, map->size, align, 0xfffffffful);
		if (map->dmah == NULL) {
			free(map, M_DRM);
			return DRM_ERR(ENOMEM);
		}
		map->handle = map->dmah->vaddr;
		map->offset = map->dmah->busaddr;
		break;
	default:
		DRM_ERROR("Bad map type %d\n", map->type);
		free(map, M_DRM);
		return DRM_ERR(EINVAL);
	}

	DRM_LOCK();
	TAILQ_INSERT_TAIL(&dev->maplist, map, link);

done:
	/* Jumped to, with lock held, when a kernel map is found. */
	DRM_UNLOCK();

	DRM_DEBUG("Added map %d 0x%lx/0x%lx\n", map->type, map->offset,
	    map->size);

	*map_ptr = map;

	return 0;
}

int drm_addmap_ioctl(DRM_IOCTL_ARGS)
{
	drm_map_t request;
	drm_local_map_t *map;
	int err;
	DRM_DEVICE;

	if (!(dev->flags & (FREAD|FWRITE)))
		return DRM_ERR(EACCES); /* Require read/write */

	DRM_COPY_FROM_USER_IOCTL(request, (drm_map_t *)data, sizeof(drm_map_t));

	if (!DRM_SUSER(p) && request.type != _DRM_AGP)
		return DRM_ERR(EACCES);

	err = drm_addmap(dev, request.offset, request.size, request.type,
	    request.flags, &map);
	if (err != 0)
		return err;

	request.offset = map->offset;
	request.size = map->size;
	request.type = map->type;
	request.flags = map->flags;
	request.mtrr   = map->mtrr;
	request.handle = map->handle;

	if (request.type != _DRM_SHM) {
		request.handle = (void *)request.offset;
	}
	DRM_COPY_TO_USER_IOCTL((drm_map_t *)data, request, sizeof(drm_map_t));

	return 0;
}

void drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
{
	DRM_SPINLOCK_ASSERT(&dev->dev_lock);

	TAILQ_REMOVE(&dev->maplist, map, link);

	switch (map->type) {
	case _DRM_REGISTERS:
		if (map->bsr == NULL)
			drm_ioremapfree(map);
		/* FALLTHROUGH */
	case _DRM_FRAME_BUFFER:
		if (map->mtrr) {
			int __unused retcode;
			
			retcode = drm_mtrr_del(map->offset, map->size,
			    DRM_MTRR_WC);
			DRM_DEBUG("mtrr_del = %d\n", retcode);
		}
		break;
	case _DRM_SHM:
		free(map->handle, M_DRM);
		break;
	case _DRM_AGP:
	case _DRM_SCATTER_GATHER:
		break;
	case _DRM_CONSISTENT:
		drm_pci_free(dev, map->dmah);
		break;
	}

	if (map->bsr != NULL) {
		bus_release_resource(dev->device, SYS_RES_MEMORY, map->rid,
		    map->bsr);
	}

	free(map, M_DRM);
}

/* Remove a map private from list and deallocate resources if the mapping
 * isn't in use.
 */

int drm_rmmap_ioctl(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_local_map_t *map;
	drm_map_t request;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_map_t *)data, sizeof(request) );

	DRM_LOCK();
	TAILQ_FOREACH(map, &dev->maplist, link) {
		if (map->handle == request.handle &&
		    map->flags & _DRM_REMOVABLE)
			break;
	}

	/* No match found. */
	if (map == NULL) {
		DRM_UNLOCK();
		return DRM_ERR(EINVAL);
	}

	drm_rmmap(dev, map);

	DRM_UNLOCK();

	return 0;
}


static void drm_cleanup_buf_error(drm_device_t *dev, drm_buf_entry_t *entry)
{
	int i;

	if (entry->seg_count) {
		for (i = 0; i < entry->seg_count; i++) {
			drm_pci_free(dev, entry->seglist[i]);
		}
		free(entry->seglist, M_DRM);

		entry->seg_count = 0;
	}

   	if (entry->buf_count) {
	   	for (i = 0; i < entry->buf_count; i++) {
			free(entry->buflist[i].dev_private, M_DRM);
		}
		free(entry->buflist, M_DRM);

		entry->buf_count = 0;
	}
}

static int drm_do_addbufs_agp(drm_device_t *dev, drm_buf_desc_t *request)
{
	drm_device_dma_t *dma = dev->dma;
	drm_buf_entry_t *entry;
	/*drm_agp_mem_t *agp_entry;
	int valid*/
	drm_buf_t *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;
	drm_buf_t **temp_buflist;

	count = request->count;
	order = drm_order(request->size);
	size = 1 << order;

	alignment  = (request->flags & _DRM_PAGE_ALIGN)
		? round_page(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: 0x%lx\n", agp_offset );
	DRM_DEBUG( "alignment:  %d\n",  alignment );
	DRM_DEBUG( "page_order: %d\n",  page_order );
	DRM_DEBUG( "total:      %d\n",  total );

	/* Make sure buffers are located in AGP memory that we own */
	/* Breaks MGA due to drm_alloc_agp not setting up entries for the
	 * memory.  Safe to ignore for now because these ioctls are still
	 * root-only.
	 */
	/*valid = 0;
	for (agp_entry = dev->agp->memory; agp_entry;
	    agp_entry = agp_entry->next) {
		if ((agp_offset >= agp_entry->bound) &&
		    (agp_offset + total * count <=
		    agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
			valid = 1;
			break;
		}
	}
	if (!valid) {
		DRM_DEBUG("zone invalid\n");
		return DRM_ERR(EINVAL);
	}*/

	entry = &dma->bufs[order];

	entry->buflist = malloc(count * sizeof(*entry->buflist), M_DRM,
	    M_NOWAIT | M_ZERO);
	if ( !entry->buflist ) {
		return DRM_ERR(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->pending = 0;
		buf->filp    = NULL;

		buf->dev_priv_size = dev->driver.buf_priv_size;
		buf->dev_private = malloc(buf->dev_priv_size, M_DRM,
		    M_NOWAIT | M_ZERO);
		if (buf->dev_private == NULL) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			drm_cleanup_buf_error(dev, entry);
			return DRM_ERR(ENOMEM);
		}

		offset += alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}

	DRM_DEBUG( "byte_count: %d\n", byte_count );

	temp_buflist = realloc(dma->buflist,
	    (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), M_DRM,
	    M_NOWAIT);
	if (temp_buflist == NULL) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		return DRM_ERR(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->byte_count += byte_count;

	DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
	DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );

	request->count = entry->buf_count;
	request->size = size;

	dma->flags = _DRM_DMA_USE_AGP;

	return 0;
}

static int drm_do_addbufs_pci(drm_device_t *dev, drm_buf_desc_t *request)
{
	drm_device_dma_t *dma = dev->dma;
	int count;
	int order;
	int size;
	int total;
	int page_order;
	drm_buf_entry_t *entry;
	drm_buf_t *buf;
	int alignment;
	unsigned long offset;
	int i;
	int byte_count;
	int page_count;
	unsigned long *temp_pagelist;
	drm_buf_t **temp_buflist;

	count = request->count;
	order = drm_order(request->size);
	size = 1 << order;

	DRM_DEBUG( "count=%d, size=%d (%d), order=%d\n",
		   request->count, request->size, size, order );

	alignment = (request->flags & _DRM_PAGE_ALIGN)
		? round_page(size) : size;
	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;

	entry = &dma->bufs[order];

	entry->buflist = malloc(count * sizeof(*entry->buflist), M_DRM,
	    M_NOWAIT | M_ZERO);
	entry->seglist = malloc(count * sizeof(*entry->seglist), M_DRM,
	    M_NOWAIT | M_ZERO);

	/* Keep the original pagelist until we know all the allocations
	 * have succeeded
	 */
	temp_pagelist = malloc((dma->page_count + (count << page_order)) *
	    sizeof(*dma->pagelist), M_DRM, M_NOWAIT);

	if (entry->buflist == NULL || entry->seglist == NULL || 
	    temp_pagelist == NULL) {
		free(entry->buflist, M_DRM);
		free(entry->seglist, M_DRM);
		return DRM_ERR(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 ) {
		drm_dma_handle_t *dmah = drm_pci_alloc(dev, size, alignment,
		    0xfffffffful);
		if (dmah == NULL) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			entry->seg_count = count;
			drm_cleanup_buf_error(dev, entry);
			free(temp_pagelist, M_DRM);
			return DRM_ERR(ENOMEM);
		}

		entry->seglist[entry->seg_count++] = dmah;
		for ( i = 0 ; i < (1 << page_order) ; i++ ) {
			DRM_DEBUG( "page %d @ %p\n",
				   dma->page_count + page_count,
				   (char *)dmah->vaddr + PAGE_SIZE * i );
			temp_pagelist[dma->page_count + page_count++] = 
			    (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 = ((char *)dmah->vaddr + offset);
			buf->bus_address = dmah->busaddr + offset;
			buf->next    = NULL;
			buf->pending = 0;
			buf->filp    = NULL;

			buf->dev_priv_size = dev->driver.buf_priv_size;
			buf->dev_private = malloc(buf->dev_priv_size, M_DRM,
			    M_NOWAIT | M_ZERO);
			if (buf->dev_private == NULL) {
				/* Set count correctly so we free the proper amount. */
				entry->buf_count = count;
				entry->seg_count = count;
				drm_cleanup_buf_error(dev, entry);
				free(temp_pagelist, M_DRM);
				return DRM_ERR(ENOMEM);
			}

			DRM_DEBUG( "buffer %d @ %p\n",
				   entry->buf_count, buf->address );
		}
		byte_count += PAGE_SIZE << page_order;
	}

	temp_buflist = realloc(dma->buflist,
	    (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), M_DRM,
	    M_NOWAIT);
	if (temp_buflist == NULL) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		free(temp_pagelist, M_DRM);
		return DRM_ERR(ENOMEM);
	}
	dma->buflist = temp_buflist;

	for ( i = 0 ; i < entry->buf_count ; i++ ) {
		dma->buflist[i + dma->buf_count] = &entry->buflist[i];
	}

	/* No allocations failed, so now we can replace the orginal pagelist
	 * with the new one.
	 */
	free(dma->pagelist, M_DRM);
	dma->pagelist = temp_pagelist;

	dma->buf_count += entry->buf_count;
	dma->seg_count += entry->seg_count;
	dma->page_count += entry->seg_count << page_order;
	dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);

	request->count = entry->buf_count;
	request->size = size;

	return 0;

}

static int drm_do_addbufs_sg(drm_device_t *dev, drm_buf_desc_t *request)
{
	drm_device_dma_t *dma = dev->dma;
	drm_buf_entry_t *entry;
	drm_buf_t *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;
	drm_buf_t **temp_buflist;

	count = request->count;
	order = drm_order(request->size);
	size = 1 << order;

	alignment  = (request->flags & _DRM_PAGE_ALIGN)
		? round_page(size) : size;
	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;

	byte_count = 0;
	agp_offset = 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: %ld\n", agp_offset );
	DRM_DEBUG( "alignment:  %d\n",  alignment );
	DRM_DEBUG( "page_order: %d\n",  page_order );
	DRM_DEBUG( "total:      %d\n",  total );

	entry = &dma->bufs[order];

	entry->buflist = malloc(count * sizeof(*entry->buflist), M_DRM,
	    M_NOWAIT | M_ZERO);
	if (entry->buflist == NULL)
		return DRM_ERR(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 + dev->sg->handle);
		buf->next    = NULL;
		buf->pending = 0;
		buf->filp    = NULL;

		buf->dev_priv_size = dev->driver.buf_priv_size;
		buf->dev_private = malloc(buf->dev_priv_size, M_DRM,
		    M_NOWAIT | M_ZERO);
		if (buf->dev_private == NULL) {
			/* Set count correctly so we free the proper amount. */
			entry->buf_count = count;
			drm_cleanup_buf_error(dev, entry);
			return DRM_ERR(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 = realloc(dma->buflist,
	    (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), M_DRM,
	    M_NOWAIT);
	if (temp_buflist == NULL) {
		/* Free the entry because it isn't valid */
		drm_cleanup_buf_error(dev, entry);
		return DRM_ERR(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->byte_count += byte_count;

	DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
	DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );

	request->count = entry->buf_count;
	request->size = size;

	dma->flags = _DRM_DMA_USE_SG;

	return 0;
}

int drm_addbufs_agp(drm_device_t *dev, drm_buf_desc_t *request)
{
	int order, ret;

	DRM_SPINLOCK(&dev->dma_lock);

	if (request->count < 0 || request->count > 4096)
		return DRM_ERR(EINVAL);
	
	order = drm_order(request->size);
	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return DRM_ERR(EINVAL);

	/* No more allocations after first buffer-using ioctl. */
	if (dev->buf_use != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(EBUSY);
	}
	/* No more than one allocation per order */
	if (dev->dma->bufs[order].buf_count != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(ENOMEM);
	}

	ret = drm_do_addbufs_agp(dev, request);

	DRM_SPINUNLOCK(&dev->dma_lock);

	return ret;
}

int drm_addbufs_sg(drm_device_t *dev, drm_buf_desc_t *request)
{
	int order, ret;

	DRM_SPINLOCK(&dev->dma_lock);

	if (!DRM_SUSER(DRM_CURPROC))
		return DRM_ERR(EACCES);

	if (request->count < 0 || request->count > 4096)
		return DRM_ERR(EINVAL);
	
	order = drm_order(request->size);
	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return DRM_ERR(EINVAL);

	/* No more allocations after first buffer-using ioctl. */
	if (dev->buf_use != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(EBUSY);
	}
	/* No more than one allocation per order */
	if (dev->dma->bufs[order].buf_count != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(ENOMEM);
	}

	ret = drm_do_addbufs_sg(dev, request);

	DRM_SPINUNLOCK(&dev->dma_lock);

	return ret;
}

int drm_addbufs_pci(drm_device_t *dev, drm_buf_desc_t *request)
{
	int order, ret;

	DRM_SPINLOCK(&dev->dma_lock);

	if (!DRM_SUSER(DRM_CURPROC))
		return DRM_ERR(EACCES);

	if (request->count < 0 || request->count > 4096)
		return DRM_ERR(EINVAL);
	
	order = drm_order(request->size);
	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
		return DRM_ERR(EINVAL);

	/* No more allocations after first buffer-using ioctl. */
	if (dev->buf_use != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(EBUSY);
	}
	/* No more than one allocation per order */
	if (dev->dma->bufs[order].buf_count != 0) {
		DRM_SPINUNLOCK(&dev->dma_lock);
		return DRM_ERR(ENOMEM);
	}

	ret = drm_do_addbufs_pci(dev, request);

	DRM_SPINUNLOCK(&dev->dma_lock);

	return ret;
}

int drm_addbufs_ioctl(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_buf_desc_t request;
	int err;

	DRM_COPY_FROM_USER_IOCTL(request, (drm_buf_desc_t *)data,
	    sizeof(request));

	if (request.flags & _DRM_AGP_BUFFER)
		err = drm_addbufs_agp(dev, &request);
	else if (request.flags & _DRM_SG_BUFFER)
		err = drm_addbufs_sg(dev, &request);
	else
		err = drm_addbufs_pci(dev, &request);

	DRM_COPY_TO_USER_IOCTL((drm_buf_desc_t *)data, request,
	    sizeof(request));

	return err;
}

int drm_infobufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_info_t request;
	int i;
	int count;
	int retcode = 0;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_info_t *)data, sizeof(request) );

	DRM_SPINLOCK(&dev->dma_lock);
	++dev->buf_use;		/* Can't allocate more after this call */
	DRM_SPINUNLOCK(&dev->dma_lock);

	for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
		if ( dma->bufs[i].buf_count ) ++count;
	}

	DRM_DEBUG( "count = %d\n", count );

	if ( request.count >= count ) {
		for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
			if ( dma->bufs[i].buf_count ) {
				drm_buf_desc_t from;

				from.count = dma->bufs[i].buf_count;
				from.size = dma->bufs[i].buf_size;
				from.low_mark = dma->bufs[i].freelist.low_mark;
				from.high_mark = dma->bufs[i].freelist.high_mark;

				if (DRM_COPY_TO_USER(&request.list[count], &from,
				    sizeof(drm_buf_desc_t)) != 0) {
					retcode = DRM_ERR(EFAULT);
					break;
				}

				DRM_DEBUG( "%d %d %d %d %d\n",
					   i,
					   dma->bufs[i].buf_count,
					   dma->bufs[i].buf_size,
					   dma->bufs[i].freelist.low_mark,
					   dma->bufs[i].freelist.high_mark );
				++count;
			}
		}
	}
	request.count = count;

	DRM_COPY_TO_USER_IOCTL( (drm_buf_info_t *)data, request, sizeof(request) );

	return retcode;
}

int drm_markbufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_desc_t request;
	int order;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_desc_t *)data, sizeof(request) );

	DRM_DEBUG( "%d, %d, %d\n",
		   request.size, request.low_mark, request.high_mark );
	

	order = drm_order(request.size);	
	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ||
	    request.low_mark < 0 || request.high_mark < 0) {
		return DRM_ERR(EINVAL);
	}

	DRM_SPINLOCK(&dev->dma_lock);
	if (request.low_mark > dma->bufs[order].buf_count ||
	    request.high_mark > dma->bufs[order].buf_count) {
		return DRM_ERR(EINVAL);
	}

	dma->bufs[order].freelist.low_mark  = request.low_mark;
	dma->bufs[order].freelist.high_mark = request.high_mark;
	DRM_SPINUNLOCK(&dev->dma_lock);

	return 0;
}

int drm_freebufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_free_t request;
	int i;
	int idx;
	drm_buf_t *buf;
	int retcode = 0;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_free_t *)data, sizeof(request) );

	DRM_DEBUG( "%d\n", request.count );
	
	DRM_SPINLOCK(&dev->dma_lock);
	for ( i = 0 ; i < request.count ; i++ ) {
		if (DRM_COPY_FROM_USER(&idx, &request.list[i], sizeof(idx))) {
			retcode = DRM_ERR(EFAULT);
			break;
		}
		if ( idx < 0 || idx >= dma->buf_count ) {
			DRM_ERROR( "Index %d (of %d max)\n",
				   idx, dma->buf_count - 1 );
			retcode = DRM_ERR(EINVAL);
			break;
		}
		buf = dma->buflist[idx];
		if ( buf->filp != filp ) {
			DRM_ERROR("Process %d freeing buffer not owned\n",
				   DRM_CURRENTPID);
			retcode = DRM_ERR(EINVAL);
			break;
		}
		drm_free_buffer(dev, buf);
	}
	DRM_SPINUNLOCK(&dev->dma_lock);

	return retcode;
}

int drm_mapbufs(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	int retcode = 0;
	const int zero = 0;
	vm_offset_t address;
	struct vmspace *vms;
#ifdef __FreeBSD__
	vm_ooffset_t foff;
	vm_size_t size;
	vm_offset_t vaddr;
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	struct vnode *vn;
	voff_t foff;
	vsize_t size;
	vaddr_t vaddr;
#endif /* __NetBSD__ || __OpenBSD__ */

	drm_buf_map_t request;
	int i;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_buf_map_t *)data, sizeof(request) );

#if defined(__NetBSD__) || defined(__OpenBSD__)
	if (!vfinddev(kdev, VCHR, &vn))
		return 0;	/* FIXME: Shouldn't this be EINVAL or something? */
#endif /* __NetBSD__ || __OpenBSD */

#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
	vms = p->td_proc->p_vmspace;
#else
	vms = p->p_vmspace;
#endif

	DRM_SPINLOCK(&dev->dma_lock);
	dev->buf_use++;		/* Can't allocate more after this call */
	DRM_SPINUNLOCK(&dev->dma_lock);

	if (request.count < dma->buf_count)
		goto done;

	if ((dev->driver.use_agp && (dma->flags & _DRM_DMA_USE_AGP)) ||
	    (dev->driver.use_sg && (dma->flags & _DRM_DMA_USE_SG))) {
		drm_local_map_t *map = dev->agp_buffer_map;

		if (map == NULL) {
			retcode = EINVAL;
			goto done;
		}
		size = round_page(map->size);
		foff = map->offset;
	} else {
		size = round_page(dma->byte_count),
		foff = 0;
	}

#ifdef __FreeBSD__
	vaddr = round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ);
#if __FreeBSD_version >= 600023
	retcode = vm_mmap(&vms->vm_map, &vaddr, size, PROT_READ | PROT_WRITE,
	    VM_PROT_ALL, MAP_SHARED, OBJT_DEVICE, kdev, foff );
#else
	retcode = vm_mmap(&vms->vm_map, &vaddr, size, PROT_READ | PROT_WRITE,
	    VM_PROT_ALL, MAP_SHARED, SLIST_FIRST(&kdev->si_hlist), foff );
#endif
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	vaddr = round_page((vaddr_t)vms->vm_daddr + MAXDSIZ);
	retcode = uvm_mmap(&vms->vm_map, &vaddr, size,
	    UVM_PROT_READ | UVM_PROT_WRITE, UVM_PROT_ALL, MAP_SHARED,
	    &vn->v_uobj, foff, p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur);
#endif /* __NetBSD__ || __OpenBSD */
	if (retcode)
		goto done;

	request.virtual = (void *)vaddr;

	for ( i = 0 ; i < dma->buf_count ; i++ ) {
		if (DRM_COPY_TO_USER(&request.list[i].idx,
		    &dma->buflist[i]->idx, sizeof(request.list[0].idx))) {
			retcode = EFAULT;
			goto done;
		}
		if (DRM_COPY_TO_USER(&request.list[i].total,
		    &dma->buflist[i]->total, sizeof(request.list[0].total))) {
			retcode = EFAULT;
			goto done;
		}
		if (DRM_COPY_TO_USER(&request.list[i].used, &zero,
		    sizeof(zero))) {
			retcode = EFAULT;
			goto done;
		}
		address = vaddr + dma->buflist[i]->offset; /* *** */
		if (DRM_COPY_TO_USER(&request.list[i].address, &address,
		    sizeof(address))) {
			retcode = EFAULT;
			goto done;
		}
	}

 done:
	request.count = dma->buf_count;

	DRM_DEBUG( "%d buffers, retcode = %d\n", request.count, retcode );

	DRM_COPY_TO_USER_IOCTL((drm_buf_map_t *)data, request, sizeof(request));

	return DRM_ERR(retcode);
}