summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tegra/drm.c
blob: 373bcd79257e0cfbcbe088cdfc9bde8ffc19ff10 (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
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012-2016 NVIDIA CORPORATION.  All rights reserved.
 */

#include <linux/bitops.h>
#include <linux/host1x.h>
#include <linux/idr.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

#include <drm/drm_aperture.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_prime.h>
#include <drm/drm_vblank.h>

#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
#include <asm/dma-iommu.h>
#endif

#include "dc.h"
#include "drm.h"
#include "gem.h"
#include "uapi.h"

#define DRIVER_NAME "tegra"
#define DRIVER_DESC "NVIDIA Tegra graphics"
#define DRIVER_DATE "20120330"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
#define DRIVER_PATCHLEVEL 0

#define CARVEOUT_SZ SZ_64M
#define CDMA_GATHER_FETCHES_MAX_NB 16383

static int tegra_atomic_check(struct drm_device *drm,
			      struct drm_atomic_state *state)
{
	int err;

	err = drm_atomic_helper_check(drm, state);
	if (err < 0)
		return err;

	return tegra_display_hub_atomic_check(drm, state);
}

static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
	.fb_create = tegra_fb_create,
	.atomic_check = tegra_atomic_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static void tegra_atomic_post_commit(struct drm_device *drm,
				     struct drm_atomic_state *old_state)
{
	struct drm_crtc_state *old_crtc_state __maybe_unused;
	struct drm_crtc *crtc;
	unsigned int i;

	for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i)
		tegra_crtc_atomic_post_commit(crtc, old_state);
}

static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
{
	struct drm_device *drm = old_state->dev;
	struct tegra_drm *tegra = drm->dev_private;

	if (tegra->hub) {
		bool fence_cookie = dma_fence_begin_signalling();

		drm_atomic_helper_commit_modeset_disables(drm, old_state);
		tegra_display_hub_atomic_commit(drm, old_state);
		drm_atomic_helper_commit_planes(drm, old_state, 0);
		drm_atomic_helper_commit_modeset_enables(drm, old_state);
		drm_atomic_helper_commit_hw_done(old_state);
		dma_fence_end_signalling(fence_cookie);
		drm_atomic_helper_wait_for_vblanks(drm, old_state);
		drm_atomic_helper_cleanup_planes(drm, old_state);
	} else {
		drm_atomic_helper_commit_tail_rpm(old_state);
	}

	tegra_atomic_post_commit(drm, old_state);
}

static const struct drm_mode_config_helper_funcs
tegra_drm_mode_config_helpers = {
	.atomic_commit_tail = tegra_atomic_commit_tail,
};

static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
{
	struct tegra_drm_file *fpriv;

	fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
	if (!fpriv)
		return -ENOMEM;

	idr_init_base(&fpriv->legacy_contexts, 1);
	xa_init_flags(&fpriv->contexts, XA_FLAGS_ALLOC1);
	xa_init(&fpriv->syncpoints);
	mutex_init(&fpriv->lock);
	filp->driver_priv = fpriv;

	return 0;
}

static void tegra_drm_context_free(struct tegra_drm_context *context)
{
	context->client->ops->close_channel(context);
	pm_runtime_put(context->client->base.dev);
	kfree(context);
}

static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
				       struct drm_tegra_reloc __user *src,
				       struct drm_device *drm,
				       struct drm_file *file)
{
	u32 cmdbuf, target;
	int err;

	err = get_user(cmdbuf, &src->cmdbuf.handle);
	if (err < 0)
		return err;

	err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
	if (err < 0)
		return err;

	err = get_user(target, &src->target.handle);
	if (err < 0)
		return err;

	err = get_user(dest->target.offset, &src->target.offset);
	if (err < 0)
		return err;

	err = get_user(dest->shift, &src->shift);
	if (err < 0)
		return err;

	dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;

	dest->cmdbuf.bo = tegra_gem_lookup(file, cmdbuf);
	if (!dest->cmdbuf.bo)
		return -ENOENT;

	dest->target.bo = tegra_gem_lookup(file, target);
	if (!dest->target.bo)
		return -ENOENT;

	return 0;
}

int tegra_drm_submit(struct tegra_drm_context *context,
		     struct drm_tegra_submit *args, struct drm_device *drm,
		     struct drm_file *file)
{
	struct host1x_client *client = &context->client->base;
	unsigned int num_cmdbufs = args->num_cmdbufs;
	unsigned int num_relocs = args->num_relocs;
	struct drm_tegra_cmdbuf __user *user_cmdbufs;
	struct drm_tegra_reloc __user *user_relocs;
	struct drm_tegra_syncpt __user *user_syncpt;
	struct drm_tegra_syncpt syncpt;
	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
	struct drm_gem_object **refs;
	struct host1x_syncpt *sp = NULL;
	struct host1x_job *job;
	unsigned int num_refs;
	int err;

	user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
	user_relocs = u64_to_user_ptr(args->relocs);
	user_syncpt = u64_to_user_ptr(args->syncpts);

	/* We don't yet support other than one syncpt_incr struct per submit */
	if (args->num_syncpts != 1)
		return -EINVAL;

	/* We don't yet support waitchks */
	if (args->num_waitchks != 0)
		return -EINVAL;

	job = host1x_job_alloc(context->channel, args->num_cmdbufs,
			       args->num_relocs, false);
	if (!job)
		return -ENOMEM;

	job->num_relocs = args->num_relocs;
	job->client = client;
	job->class = client->class;
	job->serialize = true;
	job->syncpt_recovery = true;

	/*
	 * Track referenced BOs so that they can be unreferenced after the
	 * submission is complete.
	 */
	num_refs = num_cmdbufs + num_relocs * 2;

	refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
	if (!refs) {
		err = -ENOMEM;
		goto put;
	}

	/* reuse as an iterator later */
	num_refs = 0;

	while (num_cmdbufs) {
		struct drm_tegra_cmdbuf cmdbuf;
		struct host1x_bo *bo;
		struct tegra_bo *obj;
		u64 offset;

		if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) {
			err = -EFAULT;
			goto fail;
		}

		/*
		 * The maximum number of CDMA gather fetches is 16383, a higher
		 * value means the words count is malformed.
		 */
		if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
			err = -EINVAL;
			goto fail;
		}

		bo = tegra_gem_lookup(file, cmdbuf.handle);
		if (!bo) {
			err = -ENOENT;
			goto fail;
		}

		offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
		obj = host1x_to_tegra_bo(bo);
		refs[num_refs++] = &obj->gem;

		/*
		 * Gather buffer base address must be 4-bytes aligned,
		 * unaligned offset is malformed and cause commands stream
		 * corruption on the buffer address relocation.
		 */
		if (offset & 3 || offset > obj->gem.size) {
			err = -EINVAL;
			goto fail;
		}

		host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
		num_cmdbufs--;
		user_cmdbufs++;
	}

	/* copy and resolve relocations from submit */
	while (num_relocs--) {
		struct host1x_reloc *reloc;
		struct tegra_bo *obj;

		err = host1x_reloc_copy_from_user(&job->relocs[num_relocs],
						  &user_relocs[num_relocs], drm,
						  file);
		if (err < 0)
			goto fail;

		reloc = &job->relocs[num_relocs];
		obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
		refs[num_refs++] = &obj->gem;

		/*
		 * The unaligned cmdbuf offset will cause an unaligned write
		 * during of the relocations patching, corrupting the commands
		 * stream.
		 */
		if (reloc->cmdbuf.offset & 3 ||
		    reloc->cmdbuf.offset >= obj->gem.size) {
			err = -EINVAL;
			goto fail;
		}

		obj = host1x_to_tegra_bo(reloc->target.bo);
		refs[num_refs++] = &obj->gem;

		if (reloc->target.offset >= obj->gem.size) {
			err = -EINVAL;
			goto fail;
		}
	}

	if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
		err = -EFAULT;
		goto fail;
	}

	/* Syncpoint ref will be dropped on job release. */
	sp = host1x_syncpt_get_by_id(host1x, syncpt.id);
	if (!sp) {
		err = -ENOENT;
		goto fail;
	}

	job->is_addr_reg = context->client->ops->is_addr_reg;
	job->is_valid_class = context->client->ops->is_valid_class;
	job->syncpt_incrs = syncpt.incrs;
	job->syncpt = sp;
	job->timeout = 10000;

	if (args->timeout && args->timeout < 10000)
		job->timeout = args->timeout;

	err = host1x_job_pin(job, context->client->base.dev);
	if (err)
		goto fail;

	err = host1x_job_submit(job);
	if (err) {
		host1x_job_unpin(job);
		goto fail;
	}

	args->fence = job->syncpt_end;

fail:
	while (num_refs--)
		drm_gem_object_put(refs[num_refs]);

	kfree(refs);

put:
	host1x_job_put(job);
	return err;
}


#ifdef CONFIG_DRM_TEGRA_STAGING
static int tegra_gem_create(struct drm_device *drm, void *data,
			    struct drm_file *file)
{
	struct drm_tegra_gem_create *args = data;
	struct tegra_bo *bo;

	bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
					 &args->handle);
	if (IS_ERR(bo))
		return PTR_ERR(bo);

	return 0;
}

static int tegra_gem_mmap(struct drm_device *drm, void *data,
			  struct drm_file *file)
{
	struct drm_tegra_gem_mmap *args = data;
	struct drm_gem_object *gem;
	struct tegra_bo *bo;

	gem = drm_gem_object_lookup(file, args->handle);
	if (!gem)
		return -EINVAL;

	bo = to_tegra_bo(gem);

	args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);

	drm_gem_object_put(gem);

	return 0;
}

static int tegra_syncpt_read(struct drm_device *drm, void *data,
			     struct drm_file *file)
{
	struct host1x *host = dev_get_drvdata(drm->dev->parent);
	struct drm_tegra_syncpt_read *args = data;
	struct host1x_syncpt *sp;

	sp = host1x_syncpt_get_by_id_noref(host, args->id);
	if (!sp)
		return -EINVAL;

	args->value = host1x_syncpt_read_min(sp);
	return 0;
}

static int tegra_syncpt_incr(struct drm_device *drm, void *data,
			     struct drm_file *file)
{
	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
	struct drm_tegra_syncpt_incr *args = data;
	struct host1x_syncpt *sp;

	sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
	if (!sp)
		return -EINVAL;

	return host1x_syncpt_incr(sp);
}

static int tegra_syncpt_wait(struct drm_device *drm, void *data,
			     struct drm_file *file)
{
	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
	struct drm_tegra_syncpt_wait *args = data;
	struct host1x_syncpt *sp;

	sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
	if (!sp)
		return -EINVAL;

	return host1x_syncpt_wait(sp, args->thresh,
				  msecs_to_jiffies(args->timeout),
				  &args->value);
}

static int tegra_client_open(struct tegra_drm_file *fpriv,
			     struct tegra_drm_client *client,
			     struct tegra_drm_context *context)
{
	int err;

	err = pm_runtime_resume_and_get(client->base.dev);
	if (err)
		return err;

	err = client->ops->open_channel(client, context);
	if (err < 0) {
		pm_runtime_put(client->base.dev);
		return err;
	}

	err = idr_alloc(&fpriv->legacy_contexts, context, 1, 0, GFP_KERNEL);
	if (err < 0) {
		client->ops->close_channel(context);
		pm_runtime_put(client->base.dev);
		return err;
	}

	context->client = client;
	context->id = err;

	return 0;
}

static int tegra_open_channel(struct drm_device *drm, void *data,
			      struct drm_file *file)
{
	struct tegra_drm_file *fpriv = file->driver_priv;
	struct tegra_drm *tegra = drm->dev_private;
	struct drm_tegra_open_channel *args = data;
	struct tegra_drm_context *context;
	struct tegra_drm_client *client;
	int err = -ENODEV;

	context = kzalloc(sizeof(*context), GFP_KERNEL);
	if (!context)
		return -ENOMEM;

	mutex_lock(&fpriv->lock);

	list_for_each_entry(client, &tegra->clients, list)
		if (client->base.class == args->client) {
			err = tegra_client_open(fpriv, client, context);
			if (err < 0)
				break;

			args->context = context->id;
			break;
		}

	if (err < 0)
		kfree(context);

	mutex_unlock(&fpriv->lock);
	return err;
}

static int tegra_close_channel(struct drm_device *drm, void *data,
			       struct drm_file *file)
{
	struct tegra_drm_file *fpriv = file->driver_priv;
	struct drm_tegra_close_channel *args = data;
	struct tegra_drm_context *context;
	int err = 0;

	mutex_lock(&fpriv->lock);

	context = idr_find(&fpriv->legacy_contexts, args->context);
	if (!context) {
		err = -EINVAL;
		goto unlock;
	}

	idr_remove(&fpriv->legacy_contexts, context->id);
	tegra_drm_context_free(context);

unlock:
	mutex_unlock(&fpriv->lock);
	return err;
}

static int tegra_get_syncpt(struct drm_device *drm, void *data,
			    struct drm_file *file)
{
	struct tegra_drm_file *fpriv = file->driver_priv;
	struct drm_tegra_get_syncpt *args = data;
	struct tegra_drm_context *context;
	struct host1x_syncpt *syncpt;
	int err = 0;

	mutex_lock(&fpriv->lock);

	context = idr_find(&fpriv->legacy_contexts, args->context);
	if (!context) {
		err = -ENODEV;
		goto unlock;
	}

	if (args->index >= context->client->base.num_syncpts) {
		err = -EINVAL;
		goto unlock;
	}

	syncpt = context->client->base.syncpts[args->index];
	args->id = host1x_syncpt_id(syncpt);

unlock:
	mutex_unlock(&fpriv->lock);
	return err;
}

static int tegra_submit(struct drm_device *drm, void *data,
			struct drm_file *file)
{
	struct tegra_drm_file *fpriv = file->driver_priv;
	struct drm_tegra_submit *args = data;
	struct tegra_drm_context *context;
	int err;

	mutex_lock(&fpriv->lock);

	context = idr_find(&fpriv->legacy_contexts, args->context);
	if (!context) {
		err = -ENODEV;
		goto unlock;
	}

	err = context->client->ops->submit(context, args, drm, file);

unlock:
	mutex_unlock(&fpriv->lock);
	return err;
}

static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
				 struct drm_file *file)
{
	struct tegra_drm_file *fpriv = file->driver_priv;
	struct drm_tegra_get_syncpt_base *args = data;
	struct tegra_drm_context *context;
	struct host1x_syncpt_base *base;
	struct host1x_syncpt *syncpt;
	int err = 0;

	mutex_lock(&fpriv->lock);

	context = idr_find(&fpriv->legacy_contexts, args->context);
	if (!context) {
		err = -ENODEV;
		goto unlock;
	}

	if (args->syncpt >= context->client->base.num_syncpts) {
		err = -EINVAL;
		goto unlock;
	}

	syncpt = context->client->base.syncpts[args->syncpt];

	base = host1x_syncpt_get_base(syncpt);
	if (!base) {
		err = -ENXIO;
		goto unlock;
	}

	args->id = host1x_syncpt_base_id(base);

unlock:
	mutex_unlock(&fpriv->lock);
	return err;
}

static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
				struct drm_file *file)
{
	struct drm_tegra_gem_set_tiling *args = data;
	enum tegra_bo_tiling_mode mode;
	struct drm_gem_object *gem;
	unsigned long value = 0;
	struct tegra_bo *bo;

	switch (args->mode) {
	case DRM_TEGRA_GEM_TILING_MODE_PITCH:
		mode = TEGRA_BO_TILING_MODE_PITCH;

		if (args->value != 0)
			return -EINVAL;

		break;

	case DRM_TEGRA_GEM_TILING_MODE_TILED:
		mode = TEGRA_BO_TILING_MODE_TILED;

		if (args->value != 0)
			return -EINVAL;

		break;

	case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
		mode = TEGRA_BO_TILING_MODE_BLOCK;

		if (args->value > 5)
			return -EINVAL;

		value = args->value;
		break;

	default:
		return -EINVAL;
	}

	gem = drm_gem_object_lookup(file, args->handle);
	if (!gem)
		return -ENOENT;

	bo = to_tegra_bo(gem);

	bo->tiling.mode = mode;
	bo->tiling.value = value;

	drm_gem_object_put(gem);

	return 0;
}

static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
				struct drm_file *file)
{
	struct drm_tegra_gem_get_tiling *args = data;
	struct drm_gem_object *gem;
	struct tegra_bo *bo;
	int err = 0;

	gem = drm_gem_object_lookup(file, args->handle);
	if (!gem)
		return -ENOENT;

	bo = to_tegra_bo(gem);

	switch (bo->tiling.mode) {
	case TEGRA_BO_TILING_MODE_PITCH:
		args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
		args->value = 0;
		break;

	case TEGRA_BO_TILING_MODE_TILED:
		args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
		args->value = 0;
		break;

	case TEGRA_BO_TILING_MODE_BLOCK:
		args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
		args->value = bo->tiling.value;
		break;

	default:
		err = -EINVAL;
		break;
	}

	drm_gem_object_put(gem);

	return err;
}

static int tegra_gem_set_flags(struct drm_device *drm, void *data,
			       struct drm_file *file)
{
	struct drm_tegra_gem_set_flags *args = data;
	struct drm_gem_object *gem;
	struct tegra_bo *bo;

	if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
		return -EINVAL;

	gem = drm_gem_object_lookup(file, args->handle);
	if (!gem)
		return -ENOENT;

	bo = to_tegra_bo(gem);
	bo->flags = 0;

	if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
		bo->flags |= TEGRA_BO_BOTTOM_UP;

	drm_gem_object_put(gem);

	return 0;
}

static int tegra_gem_get_flags(struct drm_device *drm, void *data,
			       struct drm_file *file)
{
	struct drm_tegra_gem_get_flags *args = data;
	struct drm_gem_object *gem;
	struct tegra_bo *bo;

	gem = drm_gem_object_lookup(file, args->handle);
	if (!gem)
		return -ENOENT;

	bo = to_tegra_bo(gem);
	args->flags = 0;

	if (bo->flags & TEGRA_BO_BOTTOM_UP)
		args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;

	drm_gem_object_put(gem);

	return 0;
}
#endif

static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
#ifdef CONFIG_DRM_TEGRA_STAGING
	DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_OPEN, tegra_drm_ioctl_channel_open,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_CLOSE, tegra_drm_ioctl_channel_close,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_MAP, tegra_drm_ioctl_channel_map,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_UNMAP, tegra_drm_ioctl_channel_unmap,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_SUBMIT, tegra_drm_ioctl_channel_submit,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_ALLOCATE, tegra_drm_ioctl_syncpoint_allocate,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_FREE, tegra_drm_ioctl_syncpoint_free,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_WAIT, tegra_drm_ioctl_syncpoint_wait,
			  DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
			  DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
			  DRM_RENDER_ALLOW),
#endif
};

static const struct file_operations tegra_drm_fops = {
	.owner = THIS_MODULE,
	.open = drm_open,
	.release = drm_release,
	.unlocked_ioctl = drm_ioctl,
	.mmap = tegra_drm_mmap,
	.poll = drm_poll,
	.read = drm_read,
	.compat_ioctl = drm_compat_ioctl,
	.llseek = noop_llseek,
};

static int tegra_drm_context_cleanup(int id, void *p, void *data)
{
	struct tegra_drm_context *context = p;

	tegra_drm_context_free(context);

	return 0;
}

static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
{
	struct tegra_drm_file *fpriv = file->driver_priv;

	mutex_lock(&fpriv->lock);
	idr_for_each(&fpriv->legacy_contexts, tegra_drm_context_cleanup, NULL);
	tegra_drm_uapi_close_file(fpriv);
	mutex_unlock(&fpriv->lock);

	idr_destroy(&fpriv->legacy_contexts);
	mutex_destroy(&fpriv->lock);
	kfree(fpriv);
}

#ifdef CONFIG_DEBUG_FS
static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *)s->private;
	struct drm_device *drm = node->minor->dev;
	struct drm_framebuffer *fb;

	mutex_lock(&drm->mode_config.fb_lock);

	list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
		seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
			   fb->base.id, fb->width, fb->height,
			   fb->format->depth,
			   fb->format->cpp[0] * 8,
			   drm_framebuffer_read_refcount(fb));
	}

	mutex_unlock(&drm->mode_config.fb_lock);

	return 0;
}

static int tegra_debugfs_iova(struct seq_file *s, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *)s->private;
	struct drm_device *drm = node->minor->dev;
	struct tegra_drm *tegra = drm->dev_private;
	struct drm_printer p = drm_seq_file_printer(s);

	if (tegra->domain) {
		mutex_lock(&tegra->mm_lock);
		drm_mm_print(&tegra->mm, &p);
		mutex_unlock(&tegra->mm_lock);
	}

	return 0;
}

static struct drm_info_list tegra_debugfs_list[] = {
	{ "framebuffers", tegra_debugfs_framebuffers, 0 },
	{ "iova", tegra_debugfs_iova, 0 },
};

static void tegra_debugfs_init(struct drm_minor *minor)
{
	drm_debugfs_create_files(tegra_debugfs_list,
				 ARRAY_SIZE(tegra_debugfs_list),
				 minor->debugfs_root, minor);
}
#endif

static const struct drm_driver tegra_drm_driver = {
	.driver_features = DRIVER_MODESET | DRIVER_GEM |
			   DRIVER_ATOMIC | DRIVER_RENDER | DRIVER_SYNCOBJ,
	.open = tegra_drm_open,
	.postclose = tegra_drm_postclose,

#if defined(CONFIG_DEBUG_FS)
	.debugfs_init = tegra_debugfs_init,
#endif

	.gem_prime_import = tegra_gem_prime_import,

	.dumb_create = tegra_bo_dumb_create,

	.ioctls = tegra_drm_ioctls,
	.num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
	.fops = &tegra_drm_fops,

	.name = DRIVER_NAME,
	.desc = DRIVER_DESC,
	.date = DRIVER_DATE,
	.major = DRIVER_MAJOR,
	.minor = DRIVER_MINOR,
	.patchlevel = DRIVER_PATCHLEVEL,
};

int tegra_drm_register_client(struct tegra_drm *tegra,
			      struct tegra_drm_client *client)
{
	/*
	 * When MLOCKs are implemented, change to allocate a shared channel
	 * only when MLOCKs are disabled.
	 */
	client->shared_channel = host1x_channel_request(&client->base);
	if (!client->shared_channel)
		return -EBUSY;

	mutex_lock(&tegra->clients_lock);
	list_add_tail(&client->list, &tegra->clients);
	client->drm = tegra;
	mutex_unlock(&tegra->clients_lock);

	return 0;
}

int tegra_drm_unregister_client(struct tegra_drm *tegra,
				struct tegra_drm_client *client)
{
	mutex_lock(&tegra->clients_lock);
	list_del_init(&client->list);
	client->drm = NULL;
	mutex_unlock(&tegra->clients_lock);

	if (client->shared_channel)
		host1x_channel_put(client->shared_channel);

	return 0;
}

int host1x_client_iommu_attach(struct host1x_client *client)
{
	struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev);
	struct drm_device *drm = dev_get_drvdata(client->host);
	struct tegra_drm *tegra = drm->dev_private;
	struct iommu_group *group = NULL;
	int err;

#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
	if (client->dev->archdata.mapping) {
		struct dma_iommu_mapping *mapping =
				to_dma_iommu_mapping(client->dev);
		arm_iommu_detach_device(client->dev);
		arm_iommu_release_mapping(mapping);

		domain = iommu_get_domain_for_dev(client->dev);
	}
#endif

	/*
	 * If the host1x client is already attached to an IOMMU domain that is
	 * not the shared IOMMU domain, don't try to attach it to a different
	 * domain. This allows using the IOMMU-backed DMA API.
	 */
	if (domain && domain != tegra->domain)
		return 0;

	if (tegra->domain) {
		group = iommu_group_get(client->dev);
		if (!group)
			return -ENODEV;

		if (domain != tegra->domain) {
			err = iommu_attach_group(tegra->domain, group);
			if (err < 0) {
				iommu_group_put(group);
				return err;
			}
		}

		tegra->use_explicit_iommu = true;
	}

	client->group = group;

	return 0;
}

void host1x_client_iommu_detach(struct host1x_client *client)
{
	struct drm_device *drm = dev_get_drvdata(client->host);
	struct tegra_drm *tegra = drm->dev_private;
	struct iommu_domain *domain;

	if (client->group) {
		/*
		 * Devices that are part of the same group may no longer be
		 * attached to a domain at this point because their group may
		 * have been detached by an earlier client.
		 */
		domain = iommu_get_domain_for_dev(client->dev);
		if (domain)
			iommu_detach_group(tegra->domain, client->group);

		iommu_group_put(client->group);
		client->group = NULL;
	}
}

void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
{
	struct iova *alloc;
	void *virt;
	gfp_t gfp;
	int err;

	if (tegra->domain)
		size = iova_align(&tegra->carveout.domain, size);
	else
		size = PAGE_ALIGN(size);

	gfp = GFP_KERNEL | __GFP_ZERO;
	if (!tegra->domain) {
		/*
		 * Many units only support 32-bit addresses, even on 64-bit
		 * SoCs. If there is no IOMMU to translate into a 32-bit IO
		 * virtual address space, force allocations to be in the
		 * lower 32-bit range.
		 */
		gfp |= GFP_DMA;
	}

	virt = (void *)__get_free_pages(gfp, get_order(size));
	if (!virt)
		return ERR_PTR(-ENOMEM);

	if (!tegra->domain) {
		/*
		 * If IOMMU is disabled, devices address physical memory
		 * directly.
		 */
		*dma = virt_to_phys(virt);
		return virt;
	}

	alloc = alloc_iova(&tegra->carveout.domain,
			   size >> tegra->carveout.shift,
			   tegra->carveout.limit, true);
	if (!alloc) {
		err = -EBUSY;
		goto free_pages;
	}

	*dma = iova_dma_addr(&tegra->carveout.domain, alloc);
	err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
			size, IOMMU_READ | IOMMU_WRITE, GFP_KERNEL);
	if (err < 0)
		goto free_iova;

	return virt;

free_iova:
	__free_iova(&tegra->carveout.domain, alloc);
free_pages:
	free_pages((unsigned long)virt, get_order(size));

	return ERR_PTR(err);
}

void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
		    dma_addr_t dma)
{
	if (tegra->domain)
		size = iova_align(&tegra->carveout.domain, size);
	else
		size = PAGE_ALIGN(size);

	if (tegra->domain) {
		iommu_unmap(tegra->domain, dma, size);
		free_iova(&tegra->carveout.domain,
			  iova_pfn(&tegra->carveout.domain, dma));
	}

	free_pages((unsigned long)virt, get_order(size));
}

static bool host1x_drm_wants_iommu(struct host1x_device *dev)
{
	struct host1x *host1x = dev_get_drvdata(dev->dev.parent);
	struct iommu_domain *domain;

	/* Our IOMMU usage policy doesn't currently play well with GART */
	if (of_machine_is_compatible("nvidia,tegra20"))
		return false;

	/*
	 * If the Tegra DRM clients are backed by an IOMMU, push buffers are
	 * likely to be allocated beyond the 32-bit boundary if sufficient
	 * system memory is available. This is problematic on earlier Tegra
	 * generations where host1x supports a maximum of 32 address bits in
	 * the GATHER opcode. In this case, unless host1x is behind an IOMMU
	 * as well it won't be able to process buffers allocated beyond the
	 * 32-bit boundary.
	 *
	 * The DMA API will use bounce buffers in this case, so that could
	 * perhaps still be made to work, even if less efficient, but there
	 * is another catch: in order to perform cache maintenance on pages
	 * allocated for discontiguous buffers we need to map and unmap the
	 * SG table representing these buffers. This is fine for something
	 * small like a push buffer, but it exhausts the bounce buffer pool
	 * (typically on the order of a few MiB) for framebuffers (many MiB
	 * for any modern resolution).
	 *
	 * Work around this by making sure that Tegra DRM clients only use
	 * an IOMMU if the parent host1x also uses an IOMMU.
	 *
	 * Note that there's still a small gap here that we don't cover: if
	 * the DMA API is backed by an IOMMU there's no way to control which
	 * device is attached to an IOMMU and which isn't, except via wiring
	 * up the device tree appropriately. This is considered an problem
	 * of integration, so care must be taken for the DT to be consistent.
	 */
	domain = iommu_get_domain_for_dev(dev->dev.parent);

	/*
	 * Tegra20 and Tegra30 don't support addressing memory beyond the
	 * 32-bit boundary, so the regular GATHER opcodes will always be
	 * sufficient and whether or not the host1x is attached to an IOMMU
	 * doesn't matter.
	 */
	if (!domain && host1x_get_dma_mask(host1x) <= DMA_BIT_MASK(32))
		return true;

	return domain != NULL;
}

static int host1x_drm_probe(struct host1x_device *dev)
{
	struct tegra_drm *tegra;
	struct drm_device *drm;
	int err;

	drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);

	tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
	if (!tegra) {
		err = -ENOMEM;
		goto put;
	}

	if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
		tegra->domain = iommu_domain_alloc(&platform_bus_type);
		if (!tegra->domain) {
			err = -ENOMEM;
			goto free;
		}

		err = iova_cache_get();
		if (err < 0)
			goto domain;
	}

	mutex_init(&tegra->clients_lock);
	INIT_LIST_HEAD(&tegra->clients);

	dev_set_drvdata(&dev->dev, drm);
	drm->dev_private = tegra;
	tegra->drm = drm;

	drm_mode_config_init(drm);

	drm->mode_config.min_width = 0;
	drm->mode_config.min_height = 0;
	drm->mode_config.max_width = 0;
	drm->mode_config.max_height = 0;

	drm->mode_config.normalize_zpos = true;

	drm->mode_config.funcs = &tegra_drm_mode_config_funcs;
	drm->mode_config.helper_private = &tegra_drm_mode_config_helpers;

	drm_kms_helper_poll_init(drm);

	err = host1x_device_init(dev);
	if (err < 0)
		goto poll;

	/*
	 * Now that all display controller have been initialized, the maximum
	 * supported resolution is known and the bitmask for horizontal and
	 * vertical bitfields can be computed.
	 */
	tegra->hmask = drm->mode_config.max_width - 1;
	tegra->vmask = drm->mode_config.max_height - 1;

	if (tegra->use_explicit_iommu) {
		u64 carveout_start, carveout_end, gem_start, gem_end;
		u64 dma_mask = dma_get_mask(&dev->dev);
		dma_addr_t start, end;
		unsigned long order;

		start = tegra->domain->geometry.aperture_start & dma_mask;
		end = tegra->domain->geometry.aperture_end & dma_mask;

		gem_start = start;
		gem_end = end - CARVEOUT_SZ;
		carveout_start = gem_end + 1;
		carveout_end = end;

		order = __ffs(tegra->domain->pgsize_bitmap);
		init_iova_domain(&tegra->carveout.domain, 1UL << order,
				 carveout_start >> order);

		tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
		tegra->carveout.limit = carveout_end >> tegra->carveout.shift;

		drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
		mutex_init(&tegra->mm_lock);

		DRM_DEBUG_DRIVER("IOMMU apertures:\n");
		DRM_DEBUG_DRIVER("  GEM: %#llx-%#llx\n", gem_start, gem_end);
		DRM_DEBUG_DRIVER("  Carveout: %#llx-%#llx\n", carveout_start,
				 carveout_end);
	} else if (tegra->domain) {
		iommu_domain_free(tegra->domain);
		tegra->domain = NULL;
		iova_cache_put();
	}

	if (tegra->hub) {
		err = tegra_display_hub_prepare(tegra->hub);
		if (err < 0)
			goto device;
	}

	/* syncpoints are used for full 32-bit hardware VBLANK counters */
	drm->max_vblank_count = 0xffffffff;

	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (err < 0)
		goto hub;

	drm_mode_config_reset(drm);

	/*
	 * Only take over from a potential firmware framebuffer if any CRTCs
	 * have been registered. This must not be a fatal error because there
	 * are other accelerators that are exposed via this driver.
	 *
	 * Another case where this happens is on Tegra234 where the display
	 * hardware is no longer part of the host1x complex, so this driver
	 * will not expose any modesetting features.
	 */
	if (drm->mode_config.num_crtc > 0) {
		err = drm_aperture_remove_framebuffers(&tegra_drm_driver);
		if (err < 0)
			goto hub;
	} else {
		/*
		 * Indicate to userspace that this doesn't expose any display
		 * capabilities.
		 */
		drm->driver_features &= ~(DRIVER_MODESET | DRIVER_ATOMIC);
	}

	err = drm_dev_register(drm, 0);
	if (err < 0)
		goto hub;

	tegra_fbdev_setup(drm);

	return 0;

hub:
	if (tegra->hub)
		tegra_display_hub_cleanup(tegra->hub);
device:
	if (tegra->domain) {
		mutex_destroy(&tegra->mm_lock);
		drm_mm_takedown(&tegra->mm);
		put_iova_domain(&tegra->carveout.domain);
		iova_cache_put();
	}

	host1x_device_exit(dev);
poll:
	drm_kms_helper_poll_fini(drm);
	drm_mode_config_cleanup(drm);
domain:
	if (tegra->domain)
		iommu_domain_free(tegra->domain);
free:
	kfree(tegra);
put:
	drm_dev_put(drm);
	return err;
}

static int host1x_drm_remove(struct host1x_device *dev)
{
	struct drm_device *drm = dev_get_drvdata(&dev->dev);
	struct tegra_drm *tegra = drm->dev_private;
	int err;

	drm_dev_unregister(drm);

	drm_kms_helper_poll_fini(drm);
	drm_atomic_helper_shutdown(drm);
	drm_mode_config_cleanup(drm);

	if (tegra->hub)
		tegra_display_hub_cleanup(tegra->hub);

	err = host1x_device_exit(dev);
	if (err < 0)
		dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err);

	if (tegra->domain) {
		mutex_destroy(&tegra->mm_lock);
		drm_mm_takedown(&tegra->mm);
		put_iova_domain(&tegra->carveout.domain);
		iova_cache_put();
		iommu_domain_free(tegra->domain);
	}

	kfree(tegra);
	drm_dev_put(drm);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int host1x_drm_suspend(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);

	return drm_mode_config_helper_suspend(drm);
}

static int host1x_drm_resume(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);

	return drm_mode_config_helper_resume(drm);
}
#endif

static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
			 host1x_drm_resume);

static const struct of_device_id host1x_drm_subdevs[] = {
	{ .compatible = "nvidia,tegra20-dc", },
	{ .compatible = "nvidia,tegra20-hdmi", },
	{ .compatible = "nvidia,tegra20-gr2d", },
	{ .compatible = "nvidia,tegra20-gr3d", },
	{ .compatible = "nvidia,tegra30-dc", },
	{ .compatible = "nvidia,tegra30-hdmi", },
	{ .compatible = "nvidia,tegra30-gr2d", },
	{ .compatible = "nvidia,tegra30-gr3d", },
	{ .compatible = "nvidia,tegra114-dc", },
	{ .compatible = "nvidia,tegra114-dsi", },
	{ .compatible = "nvidia,tegra114-hdmi", },
	{ .compatible = "nvidia,tegra114-gr2d", },
	{ .compatible = "nvidia,tegra114-gr3d", },
	{ .compatible = "nvidia,tegra124-dc", },
	{ .compatible = "nvidia,tegra124-sor", },
	{ .compatible = "nvidia,tegra124-hdmi", },
	{ .compatible = "nvidia,tegra124-dsi", },
	{ .compatible = "nvidia,tegra124-vic", },
	{ .compatible = "nvidia,tegra132-dsi", },
	{ .compatible = "nvidia,tegra210-dc", },
	{ .compatible = "nvidia,tegra210-dsi", },
	{ .compatible = "nvidia,tegra210-sor", },
	{ .compatible = "nvidia,tegra210-sor1", },
	{ .compatible = "nvidia,tegra210-vic", },
	{ .compatible = "nvidia,tegra210-nvdec", },
	{ .compatible = "nvidia,tegra186-display", },
	{ .compatible = "nvidia,tegra186-dc", },
	{ .compatible = "nvidia,tegra186-sor", },
	{ .compatible = "nvidia,tegra186-sor1", },
	{ .compatible = "nvidia,tegra186-vic", },
	{ .compatible = "nvidia,tegra186-nvdec", },
	{ .compatible = "nvidia,tegra194-display", },
	{ .compatible = "nvidia,tegra194-dc", },
	{ .compatible = "nvidia,tegra194-sor", },
	{ .compatible = "nvidia,tegra194-vic", },
	{ .compatible = "nvidia,tegra194-nvdec", },
	{ .compatible = "nvidia,tegra234-vic", },
	{ .compatible = "nvidia,tegra234-nvdec", },
	{ /* sentinel */ }
};

static struct host1x_driver host1x_drm_driver = {
	.driver = {
		.name = "drm",
		.pm = &host1x_drm_pm_ops,
	},
	.probe = host1x_drm_probe,
	.remove = host1x_drm_remove,
	.subdevs = host1x_drm_subdevs,
};

static struct platform_driver * const drivers[] = {
	&tegra_display_hub_driver,
	&tegra_dc_driver,
	&tegra_hdmi_driver,
	&tegra_dsi_driver,
	&tegra_dpaux_driver,
	&tegra_sor_driver,
	&tegra_gr2d_driver,
	&tegra_gr3d_driver,
	&tegra_vic_driver,
	&tegra_nvdec_driver,
};

static int __init host1x_drm_init(void)
{
	int err;

	if (drm_firmware_drivers_only())
		return -ENODEV;

	err = host1x_driver_register(&host1x_drm_driver);
	if (err < 0)
		return err;

	err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
	if (err < 0)
		goto unregister_host1x;

	return 0;

unregister_host1x:
	host1x_driver_unregister(&host1x_drm_driver);
	return err;
}
module_init(host1x_drm_init);

static void __exit host1x_drm_exit(void)
{
	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
	host1x_driver_unregister(&host1x_drm_driver);
}
module_exit(host1x_drm_exit);

MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
MODULE_LICENSE("GPL v2");