summaryrefslogtreecommitdiff
path: root/drivers/lightnvm/core.c
blob: c1bcac71008c67374ad76e9ea455cc220f8bba31 (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
1449
1450
1451
1452
1453
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
 * Initial release: Matias Bjorling <m@bjorling.me>
 */

#define pr_fmt(fmt) "nvm: " fmt

#include <linux/list.h>
#include <linux/types.h>
#include <linux/sem.h>
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/lightnvm.h>
#include <linux/sched/sysctl.h>

static LIST_HEAD(nvm_tgt_types);
static DECLARE_RWSEM(nvm_tgtt_lock);
static LIST_HEAD(nvm_devices);
static DECLARE_RWSEM(nvm_lock);

/* Map between virtual and physical channel and lun */
struct nvm_ch_map {
	int ch_off;
	int num_lun;
	int *lun_offs;
};

struct nvm_dev_map {
	struct nvm_ch_map *chnls;
	int num_ch;
};

static void nvm_free(struct kref *ref);

static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
{
	struct nvm_target *tgt;

	list_for_each_entry(tgt, &dev->targets, list)
		if (!strcmp(name, tgt->disk->disk_name))
			return tgt;

	return NULL;
}

static bool nvm_target_exists(const char *name)
{
	struct nvm_dev *dev;
	struct nvm_target *tgt;
	bool ret = false;

	down_write(&nvm_lock);
	list_for_each_entry(dev, &nvm_devices, devices) {
		mutex_lock(&dev->mlock);
		list_for_each_entry(tgt, &dev->targets, list) {
			if (!strcmp(name, tgt->disk->disk_name)) {
				ret = true;
				mutex_unlock(&dev->mlock);
				goto out;
			}
		}
		mutex_unlock(&dev->mlock);
	}

out:
	up_write(&nvm_lock);
	return ret;
}

static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
{
	int i;

	for (i = lun_begin; i <= lun_end; i++) {
		if (test_and_set_bit(i, dev->lun_map)) {
			pr_err("lun %d already allocated\n", i);
			goto err;
		}
	}

	return 0;
err:
	while (--i >= lun_begin)
		clear_bit(i, dev->lun_map);

	return -EBUSY;
}

static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
				 int lun_end)
{
	int i;

	for (i = lun_begin; i <= lun_end; i++)
		WARN_ON(!test_and_clear_bit(i, dev->lun_map));
}

static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear)
{
	struct nvm_dev *dev = tgt_dev->parent;
	struct nvm_dev_map *dev_map = tgt_dev->map;
	int i, j;

	for (i = 0; i < dev_map->num_ch; i++) {
		struct nvm_ch_map *ch_map = &dev_map->chnls[i];
		int *lun_offs = ch_map->lun_offs;
		int ch = i + ch_map->ch_off;

		if (clear) {
			for (j = 0; j < ch_map->num_lun; j++) {
				int lun = j + lun_offs[j];
				int lunid = (ch * dev->geo.num_lun) + lun;

				WARN_ON(!test_and_clear_bit(lunid,
							dev->lun_map));
			}
		}

		kfree(ch_map->lun_offs);
	}

	kfree(dev_map->chnls);
	kfree(dev_map);

	kfree(tgt_dev->luns);
	kfree(tgt_dev);
}

static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
					      u16 lun_begin, u16 lun_end,
					      u16 op)
{
	struct nvm_tgt_dev *tgt_dev = NULL;
	struct nvm_dev_map *dev_rmap = dev->rmap;
	struct nvm_dev_map *dev_map;
	struct ppa_addr *luns;
	int num_lun = lun_end - lun_begin + 1;
	int luns_left = num_lun;
	int num_ch = num_lun / dev->geo.num_lun;
	int num_ch_mod = num_lun % dev->geo.num_lun;
	int bch = lun_begin / dev->geo.num_lun;
	int blun = lun_begin % dev->geo.num_lun;
	int lunid = 0;
	int lun_balanced = 1;
	int sec_per_lun, prev_num_lun;
	int i, j;

	num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1;

	dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
	if (!dev_map)
		goto err_dev;

	dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL);
	if (!dev_map->chnls)
		goto err_chnls;

	luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL);
	if (!luns)
		goto err_luns;

	prev_num_lun = (luns_left > dev->geo.num_lun) ?
					dev->geo.num_lun : luns_left;
	for (i = 0; i < num_ch; i++) {
		struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
		int *lun_roffs = ch_rmap->lun_offs;
		struct nvm_ch_map *ch_map = &dev_map->chnls[i];
		int *lun_offs;
		int luns_in_chnl = (luns_left > dev->geo.num_lun) ?
					dev->geo.num_lun : luns_left;

		if (lun_balanced && prev_num_lun != luns_in_chnl)
			lun_balanced = 0;

		ch_map->ch_off = ch_rmap->ch_off = bch;
		ch_map->num_lun = luns_in_chnl;

		lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
		if (!lun_offs)
			goto err_ch;

		for (j = 0; j < luns_in_chnl; j++) {
			luns[lunid].ppa = 0;
			luns[lunid].a.ch = i;
			luns[lunid++].a.lun = j;

			lun_offs[j] = blun;
			lun_roffs[j + blun] = blun;
		}

		ch_map->lun_offs = lun_offs;

		/* when starting a new channel, lun offset is reset */
		blun = 0;
		luns_left -= luns_in_chnl;
	}

	dev_map->num_ch = num_ch;

	tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
	if (!tgt_dev)
		goto err_ch;

	/* Inherit device geometry from parent */
	memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));

	/* Target device only owns a portion of the physical device */
	tgt_dev->geo.num_ch = num_ch;
	tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1;
	tgt_dev->geo.all_luns = num_lun;
	tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk;

	tgt_dev->geo.op = op;

	sec_per_lun = dev->geo.clba * dev->geo.num_chk;
	tgt_dev->geo.total_secs = num_lun * sec_per_lun;

	tgt_dev->q = dev->q;
	tgt_dev->map = dev_map;
	tgt_dev->luns = luns;
	tgt_dev->parent = dev;

	return tgt_dev;
err_ch:
	while (--i >= 0)
		kfree(dev_map->chnls[i].lun_offs);
	kfree(luns);
err_luns:
	kfree(dev_map->chnls);
err_chnls:
	kfree(dev_map);
err_dev:
	return tgt_dev;
}

static struct nvm_tgt_type *__nvm_find_target_type(const char *name)
{
	struct nvm_tgt_type *tt;

	list_for_each_entry(tt, &nvm_tgt_types, list)
		if (!strcmp(name, tt->name))
			return tt;

	return NULL;
}

static struct nvm_tgt_type *nvm_find_target_type(const char *name)
{
	struct nvm_tgt_type *tt;

	down_write(&nvm_tgtt_lock);
	tt = __nvm_find_target_type(name);
	up_write(&nvm_tgtt_lock);

	return tt;
}

static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin,
				 int lun_end)
{
	if (lun_begin > lun_end || lun_end >= geo->all_luns) {
		pr_err("lun out of bound (%u:%u > %u)\n",
			lun_begin, lun_end, geo->all_luns - 1);
		return -EINVAL;
	}

	return 0;
}

static int __nvm_config_simple(struct nvm_dev *dev,
			       struct nvm_ioctl_create_simple *s)
{
	struct nvm_geo *geo = &dev->geo;

	if (s->lun_begin == -1 && s->lun_end == -1) {
		s->lun_begin = 0;
		s->lun_end = geo->all_luns - 1;
	}

	return nvm_config_check_luns(geo, s->lun_begin, s->lun_end);
}

static int __nvm_config_extended(struct nvm_dev *dev,
				 struct nvm_ioctl_create_extended *e)
{
	if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) {
		e->lun_begin = 0;
		e->lun_end = dev->geo.all_luns - 1;
	}

	/* op not set falls into target's default */
	if (e->op == 0xFFFF) {
		e->op = NVM_TARGET_DEFAULT_OP;
	} else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) {
		pr_err("invalid over provisioning value\n");
		return -EINVAL;
	}

	return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end);
}

static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
{
	struct nvm_ioctl_create_extended e;
	struct request_queue *tqueue;
	struct gendisk *tdisk;
	struct nvm_tgt_type *tt;
	struct nvm_target *t;
	struct nvm_tgt_dev *tgt_dev;
	void *targetdata;
	unsigned int mdts;
	int ret;

	switch (create->conf.type) {
	case NVM_CONFIG_TYPE_SIMPLE:
		ret = __nvm_config_simple(dev, &create->conf.s);
		if (ret)
			return ret;

		e.lun_begin = create->conf.s.lun_begin;
		e.lun_end = create->conf.s.lun_end;
		e.op = NVM_TARGET_DEFAULT_OP;
		break;
	case NVM_CONFIG_TYPE_EXTENDED:
		ret = __nvm_config_extended(dev, &create->conf.e);
		if (ret)
			return ret;

		e = create->conf.e;
		break;
	default:
		pr_err("config type not valid\n");
		return -EINVAL;
	}

	tt = nvm_find_target_type(create->tgttype);
	if (!tt) {
		pr_err("target type %s not found\n", create->tgttype);
		return -EINVAL;
	}

	if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) {
		pr_err("device is incompatible with target L2P type.\n");
		return -EINVAL;
	}

	if (nvm_target_exists(create->tgtname)) {
		pr_err("target name already exists (%s)\n",
							create->tgtname);
		return -EINVAL;
	}

	ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end);
	if (ret)
		return ret;

	t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
	if (!t) {
		ret = -ENOMEM;
		goto err_reserve;
	}

	tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op);
	if (!tgt_dev) {
		pr_err("could not create target device\n");
		ret = -ENOMEM;
		goto err_t;
	}

	tdisk = alloc_disk(0);
	if (!tdisk) {
		ret = -ENOMEM;
		goto err_dev;
	}

	tqueue = blk_alloc_queue(dev->q->node);
	if (!tqueue) {
		ret = -ENOMEM;
		goto err_disk;
	}

	strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
	tdisk->flags = GENHD_FL_EXT_DEVT;
	tdisk->major = 0;
	tdisk->first_minor = 0;
	tdisk->fops = tt->bops;
	tdisk->queue = tqueue;

	targetdata = tt->init(tgt_dev, tdisk, create->flags);
	if (IS_ERR(targetdata)) {
		ret = PTR_ERR(targetdata);
		goto err_init;
	}

	tdisk->private_data = targetdata;
	tqueue->queuedata = targetdata;

	mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
	if (dev->geo.mdts) {
		mdts = min_t(u32, dev->geo.mdts,
				(dev->geo.csecs >> 9) * NVM_MAX_VLBA);
	}
	blk_queue_max_hw_sectors(tqueue, mdts);

	set_capacity(tdisk, tt->capacity(targetdata));
	add_disk(tdisk);

	if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
		ret = -ENOMEM;
		goto err_sysfs;
	}

	t->type = tt;
	t->disk = tdisk;
	t->dev = tgt_dev;

	mutex_lock(&dev->mlock);
	list_add_tail(&t->list, &dev->targets);
	mutex_unlock(&dev->mlock);

	__module_get(tt->owner);

	return 0;
err_sysfs:
	if (tt->exit)
		tt->exit(targetdata, true);
err_init:
	blk_cleanup_queue(tqueue);
	tdisk->queue = NULL;
err_disk:
	put_disk(tdisk);
err_dev:
	nvm_remove_tgt_dev(tgt_dev, 0);
err_t:
	kfree(t);
err_reserve:
	nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
	return ret;
}

static void __nvm_remove_target(struct nvm_target *t, bool graceful)
{
	struct nvm_tgt_type *tt = t->type;
	struct gendisk *tdisk = t->disk;
	struct request_queue *q = tdisk->queue;

	del_gendisk(tdisk);
	blk_cleanup_queue(q);

	if (tt->sysfs_exit)
		tt->sysfs_exit(tdisk);

	if (tt->exit)
		tt->exit(tdisk->private_data, graceful);

	nvm_remove_tgt_dev(t->dev, 1);
	put_disk(tdisk);
	module_put(t->type->owner);

	list_del(&t->list);
	kfree(t);
}

/**
 * nvm_remove_tgt - Removes a target from the media manager
 * @remove:	ioctl structure with target name to remove.
 *
 * Returns:
 * 0: on success
 * 1: on not found
 * <0: on error
 */
static int nvm_remove_tgt(struct nvm_ioctl_remove *remove)
{
	struct nvm_target *t = NULL;
	struct nvm_dev *dev;

	down_read(&nvm_lock);
	list_for_each_entry(dev, &nvm_devices, devices) {
		mutex_lock(&dev->mlock);
		t = nvm_find_target(dev, remove->tgtname);
		if (t) {
			mutex_unlock(&dev->mlock);
			break;
		}
		mutex_unlock(&dev->mlock);
	}
	up_read(&nvm_lock);

	if (!t) {
		pr_err("failed to remove target %s\n",
				remove->tgtname);
		return 1;
	}

	__nvm_remove_target(t, true);
	kref_put(&dev->ref, nvm_free);

	return 0;
}

static int nvm_register_map(struct nvm_dev *dev)
{
	struct nvm_dev_map *rmap;
	int i, j;

	rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
	if (!rmap)
		goto err_rmap;

	rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map),
								GFP_KERNEL);
	if (!rmap->chnls)
		goto err_chnls;

	for (i = 0; i < dev->geo.num_ch; i++) {
		struct nvm_ch_map *ch_rmap;
		int *lun_roffs;
		int luns_in_chnl = dev->geo.num_lun;

		ch_rmap = &rmap->chnls[i];

		ch_rmap->ch_off = -1;
		ch_rmap->num_lun = luns_in_chnl;

		lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
		if (!lun_roffs)
			goto err_ch;

		for (j = 0; j < luns_in_chnl; j++)
			lun_roffs[j] = -1;

		ch_rmap->lun_offs = lun_roffs;
	}

	dev->rmap = rmap;

	return 0;
err_ch:
	while (--i >= 0)
		kfree(rmap->chnls[i].lun_offs);
err_chnls:
	kfree(rmap);
err_rmap:
	return -ENOMEM;
}

static void nvm_unregister_map(struct nvm_dev *dev)
{
	struct nvm_dev_map *rmap = dev->rmap;
	int i;

	for (i = 0; i < dev->geo.num_ch; i++)
		kfree(rmap->chnls[i].lun_offs);

	kfree(rmap->chnls);
	kfree(rmap);
}

static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
{
	struct nvm_dev_map *dev_map = tgt_dev->map;
	struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch];
	int lun_off = ch_map->lun_offs[p->a.lun];

	p->a.ch += ch_map->ch_off;
	p->a.lun += lun_off;
}

static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
{
	struct nvm_dev *dev = tgt_dev->parent;
	struct nvm_dev_map *dev_rmap = dev->rmap;
	struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch];
	int lun_roff = ch_rmap->lun_offs[p->a.lun];

	p->a.ch -= ch_rmap->ch_off;
	p->a.lun -= lun_roff;
}

static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
				struct ppa_addr *ppa_list, int nr_ppas)
{
	int i;

	for (i = 0; i < nr_ppas; i++) {
		nvm_map_to_dev(tgt_dev, &ppa_list[i]);
		ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]);
	}
}

static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
				struct ppa_addr *ppa_list, int nr_ppas)
{
	int i;

	for (i = 0; i < nr_ppas; i++) {
		ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]);
		nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
	}
}

static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);

	nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas);
}

static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);

	nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas);
}

int nvm_register_tgt_type(struct nvm_tgt_type *tt)
{
	int ret = 0;

	down_write(&nvm_tgtt_lock);
	if (__nvm_find_target_type(tt->name))
		ret = -EEXIST;
	else
		list_add(&tt->list, &nvm_tgt_types);
	up_write(&nvm_tgtt_lock);

	return ret;
}
EXPORT_SYMBOL(nvm_register_tgt_type);

void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
{
	if (!tt)
		return;

	down_write(&nvm_tgtt_lock);
	list_del(&tt->list);
	up_write(&nvm_tgtt_lock);
}
EXPORT_SYMBOL(nvm_unregister_tgt_type);

void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
							dma_addr_t *dma_handler)
{
	return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
								dma_handler);
}
EXPORT_SYMBOL(nvm_dev_dma_alloc);

void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
{
	dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
}
EXPORT_SYMBOL(nvm_dev_dma_free);

static struct nvm_dev *nvm_find_nvm_dev(const char *name)
{
	struct nvm_dev *dev;

	list_for_each_entry(dev, &nvm_devices, devices)
		if (!strcmp(name, dev->name))
			return dev;

	return NULL;
}

static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
			const struct ppa_addr *ppas, int nr_ppas)
{
	struct nvm_dev *dev = tgt_dev->parent;
	struct nvm_geo *geo = &tgt_dev->geo;
	int i, plane_cnt, pl_idx;
	struct ppa_addr ppa;

	if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
		rqd->nr_ppas = nr_ppas;
		rqd->ppa_addr = ppas[0];

		return 0;
	}

	rqd->nr_ppas = nr_ppas;
	rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
	if (!rqd->ppa_list) {
		pr_err("failed to allocate dma memory\n");
		return -ENOMEM;
	}

	plane_cnt = geo->pln_mode;
	rqd->nr_ppas *= plane_cnt;

	for (i = 0; i < nr_ppas; i++) {
		for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
			ppa = ppas[i];
			ppa.g.pl = pl_idx;
			rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
		}
	}

	return 0;
}

static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
			struct nvm_rq *rqd)
{
	if (!rqd->ppa_list)
		return;

	nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
}

static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
{
	int flags = 0;

	if (geo->version == NVM_OCSSD_SPEC_20)
		return 0;

	if (rqd->is_seq)
		flags |= geo->pln_mode >> 1;

	if (rqd->opcode == NVM_OP_PREAD)
		flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND);
	else if (rqd->opcode == NVM_OP_PWRITE)
		flags |= NVM_IO_SCRAMBLE_ENABLE;

	return flags;
}

int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf)
{
	struct nvm_dev *dev = tgt_dev->parent;
	int ret;

	if (!dev->ops->submit_io)
		return -ENODEV;

	nvm_rq_tgt_to_dev(tgt_dev, rqd);

	rqd->dev = tgt_dev;
	rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);

	/* In case of error, fail with right address format */
	ret = dev->ops->submit_io(dev, rqd, buf);
	if (ret)
		nvm_rq_dev_to_tgt(tgt_dev, rqd);
	return ret;
}
EXPORT_SYMBOL(nvm_submit_io);

static void nvm_sync_end_io(struct nvm_rq *rqd)
{
	struct completion *waiting = rqd->private;

	complete(waiting);
}

static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
			      void *buf)
{
	DECLARE_COMPLETION_ONSTACK(wait);
	int ret = 0;

	rqd->end_io = nvm_sync_end_io;
	rqd->private = &wait;

	ret = dev->ops->submit_io(dev, rqd, buf);
	if (ret)
		return ret;

	wait_for_completion_io(&wait);

	return 0;
}

int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
		       void *buf)
{
	struct nvm_dev *dev = tgt_dev->parent;
	int ret;

	if (!dev->ops->submit_io)
		return -ENODEV;

	nvm_rq_tgt_to_dev(tgt_dev, rqd);

	rqd->dev = tgt_dev;
	rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);

	ret = nvm_submit_io_wait(dev, rqd, buf);

	return ret;
}
EXPORT_SYMBOL(nvm_submit_io_sync);

void nvm_end_io(struct nvm_rq *rqd)
{
	struct nvm_tgt_dev *tgt_dev = rqd->dev;

	/* Convert address space */
	if (tgt_dev)
		nvm_rq_dev_to_tgt(tgt_dev, rqd);

	if (rqd->end_io)
		rqd->end_io(rqd);
}
EXPORT_SYMBOL(nvm_end_io);

static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
{
	if (!dev->ops->submit_io)
		return -ENODEV;

	rqd->dev = NULL;
	rqd->flags = nvm_set_flags(&dev->geo, rqd);

	return nvm_submit_io_wait(dev, rqd, NULL);
}

static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
{
	struct nvm_rq rqd = { NULL };
	struct bio bio;
	struct bio_vec bio_vec;
	struct page *page;
	int ret;

	page = alloc_page(GFP_KERNEL);
	if (!page)
		return -ENOMEM;

	bio_init(&bio, &bio_vec, 1);
	bio_add_page(&bio, page, PAGE_SIZE, 0);
	bio_set_op_attrs(&bio, REQ_OP_READ, 0);

	rqd.bio = &bio;
	rqd.opcode = NVM_OP_PREAD;
	rqd.is_seq = 1;
	rqd.nr_ppas = 1;
	rqd.ppa_addr = generic_to_dev_addr(dev, ppa);

	ret = nvm_submit_io_sync_raw(dev, &rqd);
	if (ret)
		return ret;

	__free_page(page);

	return rqd.error;
}

/*
 * Scans a 1.2 chunk first and last page to determine if its state.
 * If the chunk is found to be open, also scan it to update the write
 * pointer.
 */
static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
			     struct nvm_chk_meta *meta)
{
	struct nvm_geo *geo = &dev->geo;
	int ret, pg, pl;

	/* sense first page */
	ret = nvm_bb_chunk_sense(dev, ppa);
	if (ret < 0) /* io error */
		return ret;
	else if (ret == 0) /* valid data */
		meta->state = NVM_CHK_ST_OPEN;
	else if (ret > 0) {
		/*
		 * If empty page, the chunk is free, else it is an
		 * actual io error. In that case, mark it offline.
		 */
		switch (ret) {
		case NVM_RSP_ERR_EMPTYPAGE:
			meta->state = NVM_CHK_ST_FREE;
			return 0;
		case NVM_RSP_ERR_FAILCRC:
		case NVM_RSP_ERR_FAILECC:
		case NVM_RSP_WARN_HIGHECC:
			meta->state = NVM_CHK_ST_OPEN;
			goto scan;
		default:
			return -ret; /* other io error */
		}
	}

	/* sense last page */
	ppa.g.pg = geo->num_pg - 1;
	ppa.g.pl = geo->num_pln - 1;

	ret = nvm_bb_chunk_sense(dev, ppa);
	if (ret < 0) /* io error */
		return ret;
	else if (ret == 0) { /* Chunk fully written */
		meta->state = NVM_CHK_ST_CLOSED;
		meta->wp = geo->clba;
		return 0;
	} else if (ret > 0) {
		switch (ret) {
		case NVM_RSP_ERR_EMPTYPAGE:
		case NVM_RSP_ERR_FAILCRC:
		case NVM_RSP_ERR_FAILECC:
		case NVM_RSP_WARN_HIGHECC:
			meta->state = NVM_CHK_ST_OPEN;
			break;
		default:
			return -ret; /* other io error */
		}
	}

scan:
	/*
	 * chunk is open, we scan sequentially to update the write pointer.
	 * We make the assumption that targets write data across all planes
	 * before moving to the next page.
	 */
	for (pg = 0; pg < geo->num_pg; pg++) {
		for (pl = 0; pl < geo->num_pln; pl++) {
			ppa.g.pg = pg;
			ppa.g.pl = pl;

			ret = nvm_bb_chunk_sense(dev, ppa);
			if (ret < 0) /* io error */
				return ret;
			else if (ret == 0) {
				meta->wp += geo->ws_min;
			} else if (ret > 0) {
				switch (ret) {
				case NVM_RSP_ERR_EMPTYPAGE:
					return 0;
				case NVM_RSP_ERR_FAILCRC:
				case NVM_RSP_ERR_FAILECC:
				case NVM_RSP_WARN_HIGHECC:
					meta->wp += geo->ws_min;
					break;
				default:
					return -ret; /* other io error */
				}
			}
		}
	}

	return 0;
}

/*
 * folds a bad block list from its plane representation to its
 * chunk representation.
 *
 * If any of the planes status are bad or grown bad, the chunk is marked
 * offline. If not bad, the first plane state acts as the chunk state.
 */
static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
			   u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
{
	struct nvm_geo *geo = &dev->geo;
	int ret, blk, pl, offset, blktype;

	for (blk = 0; blk < geo->num_chk; blk++) {
		offset = blk * geo->pln_mode;
		blktype = blks[offset];

		for (pl = 0; pl < geo->pln_mode; pl++) {
			if (blks[offset + pl] &
					(NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
				blktype = blks[offset + pl];
				break;
			}
		}

		ppa.g.blk = blk;

		meta->wp = 0;
		meta->type = NVM_CHK_TP_W_SEQ;
		meta->wi = 0;
		meta->slba = generic_to_dev_addr(dev, ppa).ppa;
		meta->cnlb = dev->geo.clba;

		if (blktype == NVM_BLK_T_FREE) {
			ret = nvm_bb_chunk_scan(dev, ppa, meta);
			if (ret)
				return ret;
		} else {
			meta->state = NVM_CHK_ST_OFFLINE;
		}

		meta++;
	}

	return 0;
}

static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
			   int nchks, struct nvm_chk_meta *meta)
{
	struct nvm_geo *geo = &dev->geo;
	struct ppa_addr ppa;
	u8 *blks;
	int ch, lun, nr_blks;
	int ret = 0;

	ppa.ppa = slba;
	ppa = dev_to_generic_addr(dev, ppa);

	if (ppa.g.blk != 0)
		return -EINVAL;

	if ((nchks % geo->num_chk) != 0)
		return -EINVAL;

	nr_blks = geo->num_chk * geo->pln_mode;

	blks = kmalloc(nr_blks, GFP_KERNEL);
	if (!blks)
		return -ENOMEM;

	for (ch = ppa.g.ch; ch < geo->num_ch; ch++) {
		for (lun = ppa.g.lun; lun < geo->num_lun; lun++) {
			struct ppa_addr ppa_gen, ppa_dev;

			if (!nchks)
				goto done;

			ppa_gen.ppa = 0;
			ppa_gen.g.ch = ch;
			ppa_gen.g.lun = lun;
			ppa_dev = generic_to_dev_addr(dev, ppa_gen);

			ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks);
			if (ret)
				goto done;

			ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks,
									meta);
			if (ret)
				goto done;

			meta += geo->num_chk;
			nchks -= geo->num_chk;
		}
	}
done:
	kfree(blks);
	return ret;
}

int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
		       int nchks, struct nvm_chk_meta *meta)
{
	struct nvm_dev *dev = tgt_dev->parent;

	nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);

	if (dev->geo.version == NVM_OCSSD_SPEC_12)
		return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta);

	return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta);
}
EXPORT_SYMBOL_GPL(nvm_get_chunk_meta);

int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
		       int nr_ppas, int type)
{
	struct nvm_dev *dev = tgt_dev->parent;
	struct nvm_rq rqd;
	int ret;

	if (dev->geo.version == NVM_OCSSD_SPEC_20)
		return 0;

	if (nr_ppas > NVM_MAX_VLBA) {
		pr_err("unable to update all blocks atomically\n");
		return -EINVAL;
	}

	memset(&rqd, 0, sizeof(struct nvm_rq));

	nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
	nvm_rq_tgt_to_dev(tgt_dev, &rqd);

	ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
	nvm_free_rqd_ppalist(tgt_dev, &rqd);
	if (ret)
		return -EINVAL;

	return 0;
}
EXPORT_SYMBOL_GPL(nvm_set_chunk_meta);

static int nvm_core_init(struct nvm_dev *dev)
{
	struct nvm_geo *geo = &dev->geo;
	int ret;

	dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
					sizeof(unsigned long), GFP_KERNEL);
	if (!dev->lun_map)
		return -ENOMEM;

	INIT_LIST_HEAD(&dev->area_list);
	INIT_LIST_HEAD(&dev->targets);
	mutex_init(&dev->mlock);
	spin_lock_init(&dev->lock);

	ret = nvm_register_map(dev);
	if (ret)
		goto err_fmtype;

	return 0;
err_fmtype:
	kfree(dev->lun_map);
	return ret;
}

static void nvm_free(struct kref *ref)
{
	struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref);

	if (dev->dma_pool)
		dev->ops->destroy_dma_pool(dev->dma_pool);

	if (dev->rmap)
		nvm_unregister_map(dev);

	kfree(dev->lun_map);
	kfree(dev);
}

static int nvm_init(struct nvm_dev *dev)
{
	struct nvm_geo *geo = &dev->geo;
	int ret = -EINVAL;

	if (dev->ops->identity(dev)) {
		pr_err("device could not be identified\n");
		goto err;
	}

	pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id,
			geo->minor_ver_id, geo->vmnt);

	ret = nvm_core_init(dev);
	if (ret) {
		pr_err("could not initialize core structures.\n");
		goto err;
	}

	pr_info("registered %s [%u/%u/%u/%u/%u]\n",
			dev->name, dev->geo.ws_min, dev->geo.ws_opt,
			dev->geo.num_chk, dev->geo.all_luns,
			dev->geo.num_ch);
	return 0;
err:
	pr_err("failed to initialize nvm\n");
	return ret;
}

struct nvm_dev *nvm_alloc_dev(int node)
{
	struct nvm_dev *dev;

	dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
	if (dev)
		kref_init(&dev->ref);

	return dev;
}
EXPORT_SYMBOL(nvm_alloc_dev);

int nvm_register(struct nvm_dev *dev)
{
	int ret, exp_pool_size;

	if (!dev->q || !dev->ops) {
		kref_put(&dev->ref, nvm_free);
		return -EINVAL;
	}

	ret = nvm_init(dev);
	if (ret) {
		kref_put(&dev->ref, nvm_free);
		return ret;
	}

	exp_pool_size = max_t(int, PAGE_SIZE,
			      (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
	exp_pool_size = round_up(exp_pool_size, PAGE_SIZE);

	dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist",
						  exp_pool_size);
	if (!dev->dma_pool) {
		pr_err("could not create dma pool\n");
		kref_put(&dev->ref, nvm_free);
		return -ENOMEM;
	}

	/* register device with a supported media manager */
	down_write(&nvm_lock);
	list_add(&dev->devices, &nvm_devices);
	up_write(&nvm_lock);

	return 0;
}
EXPORT_SYMBOL(nvm_register);

void nvm_unregister(struct nvm_dev *dev)
{
	struct nvm_target *t, *tmp;

	mutex_lock(&dev->mlock);
	list_for_each_entry_safe(t, tmp, &dev->targets, list) {
		if (t->dev->parent != dev)
			continue;
		__nvm_remove_target(t, false);
		kref_put(&dev->ref, nvm_free);
	}
	mutex_unlock(&dev->mlock);

	down_write(&nvm_lock);
	list_del(&dev->devices);
	up_write(&nvm_lock);

	kref_put(&dev->ref, nvm_free);
}
EXPORT_SYMBOL(nvm_unregister);

static int __nvm_configure_create(struct nvm_ioctl_create *create)
{
	struct nvm_dev *dev;
	int ret;

	down_write(&nvm_lock);
	dev = nvm_find_nvm_dev(create->dev);
	up_write(&nvm_lock);

	if (!dev) {
		pr_err("device not found\n");
		return -EINVAL;
	}

	kref_get(&dev->ref);
	ret = nvm_create_tgt(dev, create);
	if (ret)
		kref_put(&dev->ref, nvm_free);

	return ret;
}

static long nvm_ioctl_info(struct file *file, void __user *arg)
{
	struct nvm_ioctl_info *info;
	struct nvm_tgt_type *tt;
	int tgt_iter = 0;

	info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
	if (IS_ERR(info))
		return -EFAULT;

	info->version[0] = NVM_VERSION_MAJOR;
	info->version[1] = NVM_VERSION_MINOR;
	info->version[2] = NVM_VERSION_PATCH;

	down_write(&nvm_tgtt_lock);
	list_for_each_entry(tt, &nvm_tgt_types, list) {
		struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];

		tgt->version[0] = tt->version[0];
		tgt->version[1] = tt->version[1];
		tgt->version[2] = tt->version[2];
		strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);

		tgt_iter++;
	}

	info->tgtsize = tgt_iter;
	up_write(&nvm_tgtt_lock);

	if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
		kfree(info);
		return -EFAULT;
	}

	kfree(info);
	return 0;
}

static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
{
	struct nvm_ioctl_get_devices *devices;
	struct nvm_dev *dev;
	int i = 0;

	devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
	if (!devices)
		return -ENOMEM;

	down_write(&nvm_lock);
	list_for_each_entry(dev, &nvm_devices, devices) {
		struct nvm_ioctl_device_info *info = &devices->info[i];

		strlcpy(info->devname, dev->name, sizeof(info->devname));

		/* kept for compatibility */
		info->bmversion[0] = 1;
		info->bmversion[1] = 0;
		info->bmversion[2] = 0;
		strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
		i++;

		if (i >= ARRAY_SIZE(devices->info)) {
			pr_err("max %zd devices can be reported.\n",
			       ARRAY_SIZE(devices->info));
			break;
		}
	}
	up_write(&nvm_lock);

	devices->nr_devices = i;

	if (copy_to_user(arg, devices,
			 sizeof(struct nvm_ioctl_get_devices))) {
		kfree(devices);
		return -EFAULT;
	}

	kfree(devices);
	return 0;
}

static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
{
	struct nvm_ioctl_create create;

	if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
		return -EFAULT;

	if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
	    create.conf.e.rsv != 0) {
		pr_err("reserved config field in use\n");
		return -EINVAL;
	}

	create.dev[DISK_NAME_LEN - 1] = '\0';
	create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
	create.tgtname[DISK_NAME_LEN - 1] = '\0';

	if (create.flags != 0) {
		__u32 flags = create.flags;

		/* Check for valid flags */
		if (flags & NVM_TARGET_FACTORY)
			flags &= ~NVM_TARGET_FACTORY;

		if (flags) {
			pr_err("flag not supported\n");
			return -EINVAL;
		}
	}

	return __nvm_configure_create(&create);
}

static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
{
	struct nvm_ioctl_remove remove;

	if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
		return -EFAULT;

	remove.tgtname[DISK_NAME_LEN - 1] = '\0';

	if (remove.flags != 0) {
		pr_err("no flags supported\n");
		return -EINVAL;
	}

	return nvm_remove_tgt(&remove);
}

/* kept for compatibility reasons */
static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
{
	struct nvm_ioctl_dev_init init;

	if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
		return -EFAULT;

	if (init.flags != 0) {
		pr_err("no flags supported\n");
		return -EINVAL;
	}

	return 0;
}

/* Kept for compatibility reasons */
static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
{
	struct nvm_ioctl_dev_factory fact;

	if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
		return -EFAULT;

	fact.dev[DISK_NAME_LEN - 1] = '\0';

	if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
		return -EINVAL;

	return 0;
}

static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	switch (cmd) {
	case NVM_INFO:
		return nvm_ioctl_info(file, argp);
	case NVM_GET_DEVICES:
		return nvm_ioctl_get_devices(file, argp);
	case NVM_DEV_CREATE:
		return nvm_ioctl_dev_create(file, argp);
	case NVM_DEV_REMOVE:
		return nvm_ioctl_dev_remove(file, argp);
	case NVM_DEV_INIT:
		return nvm_ioctl_dev_init(file, argp);
	case NVM_DEV_FACTORY:
		return nvm_ioctl_dev_factory(file, argp);
	}
	return 0;
}

static const struct file_operations _ctl_fops = {
	.open = nonseekable_open,
	.unlocked_ioctl = nvm_ctl_ioctl,
	.owner = THIS_MODULE,
	.llseek  = noop_llseek,
};

static struct miscdevice _nvm_misc = {
	.minor		= MISC_DYNAMIC_MINOR,
	.name		= "lightnvm",
	.nodename	= "lightnvm/control",
	.fops		= &_ctl_fops,
};
builtin_misc_device(_nvm_misc);