summaryrefslogtreecommitdiff
path: root/drivers/lightnvm/pblk-init.c
blob: d023ea6116bc3fc49421d906884fcbf9635b8ee5 (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
/*
 * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
 * Copyright (C) 2016 CNEX Labs
 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
 *                  Matias Bjorling <matias@cnexlabs.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * Implementation of a physical block-device target for Open-channel SSDs.
 *
 * pblk-init.c - pblk's initialization.
 */

#include "pblk.h"

static unsigned int write_buffer_size;

module_param(write_buffer_size, uint, 0644);
MODULE_PARM_DESC(write_buffer_size, "number of entries in a write buffer");

static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
				*pblk_w_rq_cache;
static DECLARE_RWSEM(pblk_lock);
struct bio_set pblk_bio_set;

static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
			  struct bio *bio)
{
	int ret;

	/* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
	 * constraint. Writes can be of arbitrary size.
	 */
	if (bio_data_dir(bio) == READ) {
		blk_queue_split(q, &bio);
		ret = pblk_submit_read(pblk, bio);
		if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
			bio_put(bio);

		return ret;
	}

	/* Prevent deadlock in the case of a modest LUN configuration and large
	 * user I/Os. Unless stalled, the rate limiter leaves at least 256KB
	 * available for user I/O.
	 */
	if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
		blk_queue_split(q, &bio);

	return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
}

static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
{
	struct pblk *pblk = q->queuedata;

	if (bio_op(bio) == REQ_OP_DISCARD) {
		pblk_discard(pblk, bio);
		if (!(bio->bi_opf & REQ_PREFLUSH)) {
			bio_endio(bio);
			return BLK_QC_T_NONE;
		}
	}

	switch (pblk_rw_io(q, pblk, bio)) {
	case NVM_IO_ERR:
		bio_io_error(bio);
		break;
	case NVM_IO_DONE:
		bio_endio(bio);
		break;
	}

	return BLK_QC_T_NONE;
}

static size_t pblk_trans_map_size(struct pblk *pblk)
{
	int entry_size = 8;

	if (pblk->addrf_len < 32)
		entry_size = 4;

	return entry_size * pblk->rl.nr_secs;
}

#ifdef CONFIG_NVM_PBLK_DEBUG
static u32 pblk_l2p_crc(struct pblk *pblk)
{
	size_t map_size;
	u32 crc = ~(u32)0;

	map_size = pblk_trans_map_size(pblk);
	crc = crc32_le(crc, pblk->trans_map, map_size);
	return crc;
}
#endif

static void pblk_l2p_free(struct pblk *pblk)
{
	vfree(pblk->trans_map);
}

static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
{
	struct pblk_line *line = NULL;

	if (factory_init) {
		pblk_setup_uuid(pblk);
	} else {
		line = pblk_recov_l2p(pblk);
		if (IS_ERR(line)) {
			pblk_err(pblk, "could not recover l2p table\n");
			return -EFAULT;
		}
	}

#ifdef CONFIG_NVM_PBLK_DEBUG
	pblk_info(pblk, "init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
#endif

	/* Free full lines directly as GC has not been started yet */
	pblk_gc_free_full_lines(pblk);

	if (!line) {
		/* Configure next line for user data */
		line = pblk_line_get_first_data(pblk);
		if (!line)
			return -EFAULT;
	}

	return 0;
}

static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
{
	sector_t i;
	struct ppa_addr ppa;
	size_t map_size;
	int ret = 0;

	map_size = pblk_trans_map_size(pblk);
	pblk->trans_map = vmalloc(map_size);
	if (!pblk->trans_map)
		return -ENOMEM;

	pblk_ppa_set_empty(&ppa);

	for (i = 0; i < pblk->rl.nr_secs; i++)
		pblk_trans_map_set(pblk, i, ppa);

	ret = pblk_l2p_recover(pblk, factory_init);
	if (ret)
		vfree(pblk->trans_map);

	return ret;
}

static void pblk_rwb_free(struct pblk *pblk)
{
	if (pblk_rb_tear_down_check(&pblk->rwb))
		pblk_err(pblk, "write buffer error on tear down\n");

	pblk_rb_data_free(&pblk->rwb);
	vfree(pblk_rb_entries_ref(&pblk->rwb));
}

static int pblk_rwb_init(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_rb_entry *entries;
	unsigned long nr_entries, buffer_size;
	unsigned int power_size, power_seg_sz;
	int pgs_in_buffer;

	pgs_in_buffer = max(geo->mw_cunits, geo->ws_opt) * geo->all_luns;

	if (write_buffer_size && (write_buffer_size > pgs_in_buffer))
		buffer_size = write_buffer_size;
	else
		buffer_size = pgs_in_buffer;

	nr_entries = pblk_rb_calculate_size(buffer_size);

	entries = vzalloc(array_size(nr_entries, sizeof(struct pblk_rb_entry)));
	if (!entries)
		return -ENOMEM;

	power_size = get_count_order(nr_entries);
	power_seg_sz = get_count_order(geo->csecs);

	return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
}

/* Minimum pages needed within a lun */
#define ADDR_POOL_SIZE 64

static int pblk_set_addrf_12(struct pblk *pblk, struct nvm_geo *geo,
			     struct nvm_addrf_12 *dst)
{
	struct nvm_addrf_12 *src = (struct nvm_addrf_12 *)&geo->addrf;
	int power_len;

	/* Re-calculate channel and lun format to adapt to configuration */
	power_len = get_count_order(geo->num_ch);
	if (1 << power_len != geo->num_ch) {
		pblk_err(pblk, "supports only power-of-two channel config.\n");
		return -EINVAL;
	}
	dst->ch_len = power_len;

	power_len = get_count_order(geo->num_lun);
	if (1 << power_len != geo->num_lun) {
		pblk_err(pblk, "supports only power-of-two LUN config.\n");
		return -EINVAL;
	}
	dst->lun_len = power_len;

	dst->blk_len = src->blk_len;
	dst->pg_len = src->pg_len;
	dst->pln_len = src->pln_len;
	dst->sec_len = src->sec_len;

	dst->sec_offset = 0;
	dst->pln_offset = dst->sec_len;
	dst->ch_offset = dst->pln_offset + dst->pln_len;
	dst->lun_offset = dst->ch_offset + dst->ch_len;
	dst->pg_offset = dst->lun_offset + dst->lun_len;
	dst->blk_offset = dst->pg_offset + dst->pg_len;

	dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
	dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
	dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
	dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
	dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
	dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;

	return dst->blk_offset + src->blk_len;
}

static int pblk_set_addrf_20(struct nvm_geo *geo, struct nvm_addrf *adst,
			     struct pblk_addrf *udst)
{
	struct nvm_addrf *src = &geo->addrf;

	adst->ch_len = get_count_order(geo->num_ch);
	adst->lun_len = get_count_order(geo->num_lun);
	adst->chk_len = src->chk_len;
	adst->sec_len = src->sec_len;

	adst->sec_offset = 0;
	adst->ch_offset = adst->sec_len;
	adst->lun_offset = adst->ch_offset + adst->ch_len;
	adst->chk_offset = adst->lun_offset + adst->lun_len;

	adst->sec_mask = ((1ULL << adst->sec_len) - 1) << adst->sec_offset;
	adst->chk_mask = ((1ULL << adst->chk_len) - 1) << adst->chk_offset;
	adst->lun_mask = ((1ULL << adst->lun_len) - 1) << adst->lun_offset;
	adst->ch_mask = ((1ULL << adst->ch_len) - 1) << adst->ch_offset;

	udst->sec_stripe = geo->ws_opt;
	udst->ch_stripe = geo->num_ch;
	udst->lun_stripe = geo->num_lun;

	udst->sec_lun_stripe = udst->sec_stripe * udst->ch_stripe;
	udst->sec_ws_stripe = udst->sec_lun_stripe * udst->lun_stripe;

	return adst->chk_offset + adst->chk_len;
}

static int pblk_set_addrf(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	int mod;

	switch (geo->version) {
	case NVM_OCSSD_SPEC_12:
		div_u64_rem(geo->clba, pblk->min_write_pgs, &mod);
		if (mod) {
			pblk_err(pblk, "bad configuration of sectors/pages\n");
			return -EINVAL;
		}

		pblk->addrf_len = pblk_set_addrf_12(pblk, geo,
							(void *)&pblk->addrf);
		break;
	case NVM_OCSSD_SPEC_20:
		pblk->addrf_len = pblk_set_addrf_20(geo, (void *)&pblk->addrf,
							&pblk->uaddrf);
		break;
	default:
		pblk_err(pblk, "OCSSD revision not supported (%d)\n",
								geo->version);
		return -EINVAL;
	}

	return 0;
}

static int pblk_init_global_caches(struct pblk *pblk)
{
	down_write(&pblk_lock);
	pblk_ws_cache = kmem_cache_create("pblk_blk_ws",
				sizeof(struct pblk_line_ws), 0, 0, NULL);
	if (!pblk_ws_cache) {
		up_write(&pblk_lock);
		return -ENOMEM;
	}

	pblk_rec_cache = kmem_cache_create("pblk_rec",
				sizeof(struct pblk_rec_ctx), 0, 0, NULL);
	if (!pblk_rec_cache) {
		kmem_cache_destroy(pblk_ws_cache);
		up_write(&pblk_lock);
		return -ENOMEM;
	}

	pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
				0, 0, NULL);
	if (!pblk_g_rq_cache) {
		kmem_cache_destroy(pblk_ws_cache);
		kmem_cache_destroy(pblk_rec_cache);
		up_write(&pblk_lock);
		return -ENOMEM;
	}

	pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
				0, 0, NULL);
	if (!pblk_w_rq_cache) {
		kmem_cache_destroy(pblk_ws_cache);
		kmem_cache_destroy(pblk_rec_cache);
		kmem_cache_destroy(pblk_g_rq_cache);
		up_write(&pblk_lock);
		return -ENOMEM;
	}
	up_write(&pblk_lock);

	return 0;
}

static void pblk_free_global_caches(struct pblk *pblk)
{
	kmem_cache_destroy(pblk_ws_cache);
	kmem_cache_destroy(pblk_rec_cache);
	kmem_cache_destroy(pblk_g_rq_cache);
	kmem_cache_destroy(pblk_w_rq_cache);
}

static int pblk_core_init(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	int ret, max_write_ppas;

	atomic64_set(&pblk->user_wa, 0);
	atomic64_set(&pblk->pad_wa, 0);
	atomic64_set(&pblk->gc_wa, 0);
	pblk->user_rst_wa = 0;
	pblk->pad_rst_wa = 0;
	pblk->gc_rst_wa = 0;

	atomic64_set(&pblk->nr_flush, 0);
	pblk->nr_flush_rst = 0;

	pblk->min_write_pgs = geo->ws_opt * (geo->csecs / PAGE_SIZE);
	max_write_ppas = pblk->min_write_pgs * geo->all_luns;
	pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
	pblk_set_sec_per_write(pblk, pblk->min_write_pgs);

	if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
		pblk_err(pblk, "vector list too big(%u > %u)\n",
				pblk->max_write_pgs, PBLK_MAX_REQ_ADDRS);
		return -EINVAL;
	}

	pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t),
								GFP_KERNEL);
	if (!pblk->pad_dist)
		return -ENOMEM;

	if (pblk_init_global_caches(pblk))
		goto fail_free_pad_dist;

	/* Internal bios can be at most the sectors signaled by the device. */
	ret = mempool_init_page_pool(&pblk->page_bio_pool, NVM_MAX_VLBA, 0);
	if (ret)
		goto free_global_caches;

	ret = mempool_init_slab_pool(&pblk->gen_ws_pool, PBLK_GEN_WS_POOL_SIZE,
				     pblk_ws_cache);
	if (ret)
		goto free_page_bio_pool;

	ret = mempool_init_slab_pool(&pblk->rec_pool, geo->all_luns,
				     pblk_rec_cache);
	if (ret)
		goto free_gen_ws_pool;

	ret = mempool_init_slab_pool(&pblk->r_rq_pool, geo->all_luns,
				     pblk_g_rq_cache);
	if (ret)
		goto free_rec_pool;

	ret = mempool_init_slab_pool(&pblk->e_rq_pool, geo->all_luns,
				     pblk_g_rq_cache);
	if (ret)
		goto free_r_rq_pool;

	ret = mempool_init_slab_pool(&pblk->w_rq_pool, geo->all_luns,
				     pblk_w_rq_cache);
	if (ret)
		goto free_e_rq_pool;

	pblk->close_wq = alloc_workqueue("pblk-close-wq",
			WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
	if (!pblk->close_wq)
		goto free_w_rq_pool;

	pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
			WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
	if (!pblk->bb_wq)
		goto free_close_wq;

	pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
			WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
	if (!pblk->r_end_wq)
		goto free_bb_wq;

	if (pblk_set_addrf(pblk))
		goto free_r_end_wq;

	INIT_LIST_HEAD(&pblk->compl_list);
	INIT_LIST_HEAD(&pblk->resubmit_list);

	return 0;

free_r_end_wq:
	destroy_workqueue(pblk->r_end_wq);
free_bb_wq:
	destroy_workqueue(pblk->bb_wq);
free_close_wq:
	destroy_workqueue(pblk->close_wq);
free_w_rq_pool:
	mempool_exit(&pblk->w_rq_pool);
free_e_rq_pool:
	mempool_exit(&pblk->e_rq_pool);
free_r_rq_pool:
	mempool_exit(&pblk->r_rq_pool);
free_rec_pool:
	mempool_exit(&pblk->rec_pool);
free_gen_ws_pool:
	mempool_exit(&pblk->gen_ws_pool);
free_page_bio_pool:
	mempool_exit(&pblk->page_bio_pool);
free_global_caches:
	pblk_free_global_caches(pblk);
fail_free_pad_dist:
	kfree(pblk->pad_dist);
	return -ENOMEM;
}

static void pblk_core_free(struct pblk *pblk)
{
	if (pblk->close_wq)
		destroy_workqueue(pblk->close_wq);

	if (pblk->r_end_wq)
		destroy_workqueue(pblk->r_end_wq);

	if (pblk->bb_wq)
		destroy_workqueue(pblk->bb_wq);

	mempool_exit(&pblk->page_bio_pool);
	mempool_exit(&pblk->gen_ws_pool);
	mempool_exit(&pblk->rec_pool);
	mempool_exit(&pblk->r_rq_pool);
	mempool_exit(&pblk->e_rq_pool);
	mempool_exit(&pblk->w_rq_pool);

	pblk_free_global_caches(pblk);
	kfree(pblk->pad_dist);
}

static void pblk_line_mg_free(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	int i;

	kfree(l_mg->bb_template);
	kfree(l_mg->bb_aux);
	kfree(l_mg->vsc_list);

	for (i = 0; i < PBLK_DATA_LINES; i++) {
		kfree(l_mg->sline_meta[i]);
		pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
		kfree(l_mg->eline_meta[i]);
	}
}

static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
				struct pblk_line *line)
{
	struct pblk_w_err_gc *w_err_gc = line->w_err_gc;

	kfree(line->blk_bitmap);
	kfree(line->erase_bitmap);
	kfree(line->chks);

	pblk_mfree(w_err_gc->lba_list, l_mg->emeta_alloc_type);
	kfree(w_err_gc);
}

static void pblk_lines_free(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *line;
	int i;

	spin_lock(&l_mg->free_lock);
	for (i = 0; i < l_mg->nr_lines; i++) {
		line = &pblk->lines[i];

		pblk_line_free(line);
		pblk_line_meta_free(l_mg, line);
	}
	spin_unlock(&l_mg->free_lock);

	pblk_line_mg_free(pblk);

	kfree(pblk->luns);
	kfree(pblk->lines);
}

static int pblk_bb_get_tbl(struct nvm_tgt_dev *dev, struct pblk_lun *rlun,
			   u8 *blks, int nr_blks)
{
	struct ppa_addr ppa;
	int ret;

	ppa.ppa = 0;
	ppa.g.ch = rlun->bppa.g.ch;
	ppa.g.lun = rlun->bppa.g.lun;

	ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
	if (ret)
		return ret;

	nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
	if (nr_blks < 0)
		return -EIO;

	return 0;
}

static void *pblk_bb_get_meta(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	u8 *meta;
	int i, nr_blks, blk_per_lun;
	int ret;

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

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

	for (i = 0; i < geo->all_luns; i++) {
		struct pblk_lun *rlun = &pblk->luns[i];
		u8 *meta_pos = meta + i * blk_per_lun;

		ret = pblk_bb_get_tbl(dev, rlun, meta_pos, blk_per_lun);
		if (ret) {
			kfree(meta);
			return ERR_PTR(-EIO);
		}
	}

	return meta;
}

static void *pblk_chunk_get_meta(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;

	if (geo->version == NVM_OCSSD_SPEC_12)
		return pblk_bb_get_meta(pblk);
	else
		return pblk_chunk_get_info(pblk);
}

static int pblk_luns_init(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_lun *rlun;
	int i;

	/* TODO: Implement unbalanced LUN support */
	if (geo->num_lun < 0) {
		pblk_err(pblk, "unbalanced LUN config.\n");
		return -EINVAL;
	}

	pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
								GFP_KERNEL);
	if (!pblk->luns)
		return -ENOMEM;

	for (i = 0; i < geo->all_luns; i++) {
		/* Stripe across channels */
		int ch = i % geo->num_ch;
		int lun_raw = i / geo->num_ch;
		int lunid = lun_raw + ch * geo->num_lun;

		rlun = &pblk->luns[i];
		rlun->bppa = dev->luns[lunid];

		sema_init(&rlun->wr_sem, 1);
	}

	return 0;
}

/* See comment over struct line_emeta definition */
static unsigned int calc_emeta_len(struct pblk *pblk)
{
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;

	/* Round to sector size so that lba_list starts on its own sector */
	lm->emeta_sec[1] = DIV_ROUND_UP(
			sizeof(struct line_emeta) + lm->blk_bitmap_len +
			sizeof(struct wa_counters), geo->csecs);
	lm->emeta_len[1] = lm->emeta_sec[1] * geo->csecs;

	/* Round to sector size so that vsc_list starts on its own sector */
	lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
	lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
			geo->csecs);
	lm->emeta_len[2] = lm->emeta_sec[2] * geo->csecs;

	lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
			geo->csecs);
	lm->emeta_len[3] = lm->emeta_sec[3] * geo->csecs;

	lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);

	return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
}

static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line_meta *lm = &pblk->lm;
	struct nvm_geo *geo = &dev->geo;
	sector_t provisioned;
	int sec_meta, blk_meta;

	if (geo->op == NVM_TARGET_DEFAULT_OP)
		pblk->op = PBLK_DEFAULT_OP;
	else
		pblk->op = geo->op;

	provisioned = nr_free_blks;
	provisioned *= (100 - pblk->op);
	sector_div(provisioned, 100);

	pblk->op_blks = nr_free_blks - provisioned;

	/* Internally pblk manages all free blocks, but all calculations based
	 * on user capacity consider only provisioned blocks
	 */
	pblk->rl.total_blocks = nr_free_blks;
	pblk->rl.nr_secs = nr_free_blks * geo->clba;

	/* Consider sectors used for metadata */
	sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
	blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);

	pblk->capacity = (provisioned - blk_meta) * geo->clba;

	atomic_set(&pblk->rl.free_blocks, nr_free_blks);
	atomic_set(&pblk->rl.free_user_blocks, nr_free_blks);
}

static int pblk_setup_line_meta_12(struct pblk *pblk, struct pblk_line *line,
				   void *chunk_meta)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	int i, chk_per_lun, nr_bad_chks = 0;

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

	for (i = 0; i < lm->blk_per_line; i++) {
		struct pblk_lun *rlun = &pblk->luns[i];
		struct nvm_chk_meta *chunk;
		int pos = pblk_ppa_to_pos(geo, rlun->bppa);
		u8 *lun_bb_meta = chunk_meta + pos * chk_per_lun;

		chunk = &line->chks[pos];

		/*
		 * In 1.2 spec. chunk state is not persisted by the device. Thus
		 * some of the values are reset each time pblk is instantiated.
		 */
		if (lun_bb_meta[line->id] == NVM_BLK_T_FREE)
			chunk->state =  NVM_CHK_ST_FREE;
		else
			chunk->state = NVM_CHK_ST_OFFLINE;

		chunk->type = NVM_CHK_TP_W_SEQ;
		chunk->wi = 0;
		chunk->slba = -1;
		chunk->cnlb = geo->clba;
		chunk->wp = 0;

		if (!(chunk->state & NVM_CHK_ST_OFFLINE))
			continue;

		set_bit(pos, line->blk_bitmap);
		nr_bad_chks++;
	}

	return nr_bad_chks;
}

static int pblk_setup_line_meta_20(struct pblk *pblk, struct pblk_line *line,
				   struct nvm_chk_meta *meta)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	int i, nr_bad_chks = 0;

	for (i = 0; i < lm->blk_per_line; i++) {
		struct pblk_lun *rlun = &pblk->luns[i];
		struct nvm_chk_meta *chunk;
		struct nvm_chk_meta *chunk_meta;
		struct ppa_addr ppa;
		int pos;

		ppa = rlun->bppa;
		pos = pblk_ppa_to_pos(geo, ppa);
		chunk = &line->chks[pos];

		ppa.m.chk = line->id;
		chunk_meta = pblk_chunk_get_off(pblk, meta, ppa);

		chunk->state = chunk_meta->state;
		chunk->type = chunk_meta->type;
		chunk->wi = chunk_meta->wi;
		chunk->slba = chunk_meta->slba;
		chunk->cnlb = chunk_meta->cnlb;
		chunk->wp = chunk_meta->wp;

		if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
			WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
			continue;
		}

		if (!(chunk->state & NVM_CHK_ST_OFFLINE))
			continue;

		set_bit(pos, line->blk_bitmap);
		nr_bad_chks++;
	}

	return nr_bad_chks;
}

static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
				 void *chunk_meta, int line_id)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line_meta *lm = &pblk->lm;
	long nr_bad_chks, chk_in_line;

	line->pblk = pblk;
	line->id = line_id;
	line->type = PBLK_LINETYPE_FREE;
	line->state = PBLK_LINESTATE_NEW;
	line->gc_group = PBLK_LINEGC_NONE;
	line->vsc = &l_mg->vsc_list[line_id];
	spin_lock_init(&line->lock);

	if (geo->version == NVM_OCSSD_SPEC_12)
		nr_bad_chks = pblk_setup_line_meta_12(pblk, line, chunk_meta);
	else
		nr_bad_chks = pblk_setup_line_meta_20(pblk, line, chunk_meta);

	chk_in_line = lm->blk_per_line - nr_bad_chks;
	if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
					chk_in_line < lm->min_blk_line) {
		line->state = PBLK_LINESTATE_BAD;
		list_add_tail(&line->list, &l_mg->bad_list);
		return 0;
	}

	atomic_set(&line->blk_in_line, chk_in_line);
	list_add_tail(&line->list, &l_mg->free_list);
	l_mg->nr_free_lines++;

	return chk_in_line;
}

static int pblk_alloc_line_meta(struct pblk *pblk, struct pblk_line *line)
{
	struct pblk_line_meta *lm = &pblk->lm;

	line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
	if (!line->blk_bitmap)
		return -ENOMEM;

	line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
	if (!line->erase_bitmap)
		goto free_blk_bitmap;


	line->chks = kmalloc_array(lm->blk_per_line,
				   sizeof(struct nvm_chk_meta), GFP_KERNEL);
	if (!line->chks)
		goto free_erase_bitmap;

	line->w_err_gc = kzalloc(sizeof(struct pblk_w_err_gc), GFP_KERNEL);
	if (!line->w_err_gc)
		goto free_chks;

	return 0;

free_chks:
	kfree(line->chks);
free_erase_bitmap:
	kfree(line->erase_bitmap);
free_blk_bitmap:
	kfree(line->blk_bitmap);
	return -ENOMEM;
}

static int pblk_line_mg_init(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line_meta *lm = &pblk->lm;
	int i, bb_distance;

	l_mg->nr_lines = geo->num_chk;
	l_mg->log_line = l_mg->data_line = NULL;
	l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
	l_mg->nr_free_lines = 0;
	bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);

	INIT_LIST_HEAD(&l_mg->free_list);
	INIT_LIST_HEAD(&l_mg->corrupt_list);
	INIT_LIST_HEAD(&l_mg->bad_list);
	INIT_LIST_HEAD(&l_mg->gc_full_list);
	INIT_LIST_HEAD(&l_mg->gc_high_list);
	INIT_LIST_HEAD(&l_mg->gc_mid_list);
	INIT_LIST_HEAD(&l_mg->gc_low_list);
	INIT_LIST_HEAD(&l_mg->gc_empty_list);
	INIT_LIST_HEAD(&l_mg->gc_werr_list);

	INIT_LIST_HEAD(&l_mg->emeta_list);

	l_mg->gc_lists[0] = &l_mg->gc_werr_list;
	l_mg->gc_lists[1] = &l_mg->gc_high_list;
	l_mg->gc_lists[2] = &l_mg->gc_mid_list;
	l_mg->gc_lists[3] = &l_mg->gc_low_list;

	spin_lock_init(&l_mg->free_lock);
	spin_lock_init(&l_mg->close_lock);
	spin_lock_init(&l_mg->gc_lock);

	l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
	if (!l_mg->vsc_list)
		goto fail;

	l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
	if (!l_mg->bb_template)
		goto fail_free_vsc_list;

	l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
	if (!l_mg->bb_aux)
		goto fail_free_bb_template;

	/* smeta is always small enough to fit on a kmalloc memory allocation,
	 * emeta depends on the number of LUNs allocated to the pblk instance
	 */
	for (i = 0; i < PBLK_DATA_LINES; i++) {
		l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
		if (!l_mg->sline_meta[i])
			goto fail_free_smeta;
	}

	/* emeta allocates three different buffers for managing metadata with
	 * in-memory and in-media layouts
	 */
	for (i = 0; i < PBLK_DATA_LINES; i++) {
		struct pblk_emeta *emeta;

		emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
		if (!emeta)
			goto fail_free_emeta;

		if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
			l_mg->emeta_alloc_type = PBLK_VMALLOC_META;

			emeta->buf = vmalloc(lm->emeta_len[0]);
			if (!emeta->buf) {
				kfree(emeta);
				goto fail_free_emeta;
			}

			emeta->nr_entries = lm->emeta_sec[0];
			l_mg->eline_meta[i] = emeta;
		} else {
			l_mg->emeta_alloc_type = PBLK_KMALLOC_META;

			emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
			if (!emeta->buf) {
				kfree(emeta);
				goto fail_free_emeta;
			}

			emeta->nr_entries = lm->emeta_sec[0];
			l_mg->eline_meta[i] = emeta;
		}
	}

	for (i = 0; i < l_mg->nr_lines; i++)
		l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);

	bb_distance = (geo->all_luns) * geo->ws_opt;
	for (i = 0; i < lm->sec_per_line; i += bb_distance)
		bitmap_set(l_mg->bb_template, i, geo->ws_opt);

	return 0;

fail_free_emeta:
	while (--i >= 0) {
		if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
			vfree(l_mg->eline_meta[i]->buf);
		else
			kfree(l_mg->eline_meta[i]->buf);
		kfree(l_mg->eline_meta[i]);
	}
fail_free_smeta:
	for (i = 0; i < PBLK_DATA_LINES; i++)
		kfree(l_mg->sline_meta[i]);
	kfree(l_mg->bb_aux);
fail_free_bb_template:
	kfree(l_mg->bb_template);
fail_free_vsc_list:
	kfree(l_mg->vsc_list);
fail:
	return -ENOMEM;
}

static int pblk_line_meta_init(struct pblk *pblk)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	unsigned int smeta_len, emeta_len;
	int i;

	lm->sec_per_line = geo->clba * geo->all_luns;
	lm->blk_per_line = geo->all_luns;
	lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
	lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
	lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
	lm->mid_thrs = lm->sec_per_line / 2;
	lm->high_thrs = lm->sec_per_line / 4;
	lm->meta_distance = (geo->all_luns / 2) * pblk->min_write_pgs;

	/* Calculate necessary pages for smeta. See comment over struct
	 * line_smeta definition
	 */
	i = 1;
add_smeta_page:
	lm->smeta_sec = i * geo->ws_opt;
	lm->smeta_len = lm->smeta_sec * geo->csecs;

	smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
	if (smeta_len > lm->smeta_len) {
		i++;
		goto add_smeta_page;
	}

	/* Calculate necessary pages for emeta. See comment over struct
	 * line_emeta definition
	 */
	i = 1;
add_emeta_page:
	lm->emeta_sec[0] = i * geo->ws_opt;
	lm->emeta_len[0] = lm->emeta_sec[0] * geo->csecs;

	emeta_len = calc_emeta_len(pblk);
	if (emeta_len > lm->emeta_len[0]) {
		i++;
		goto add_emeta_page;
	}

	lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;

	lm->min_blk_line = 1;
	if (geo->all_luns > 1)
		lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
					lm->emeta_sec[0], geo->clba);

	if (lm->min_blk_line > lm->blk_per_line) {
		pblk_err(pblk, "config. not supported. Min. LUN in line:%d\n",
							lm->blk_per_line);
		return -EINVAL;
	}

	return 0;
}

static int pblk_lines_init(struct pblk *pblk)
{
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *line;
	void *chunk_meta;
	long nr_free_chks = 0;
	int i, ret;

	ret = pblk_line_meta_init(pblk);
	if (ret)
		return ret;

	ret = pblk_line_mg_init(pblk);
	if (ret)
		return ret;

	ret = pblk_luns_init(pblk);
	if (ret)
		goto fail_free_meta;

	chunk_meta = pblk_chunk_get_meta(pblk);
	if (IS_ERR(chunk_meta)) {
		ret = PTR_ERR(chunk_meta);
		goto fail_free_luns;
	}

	pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
								GFP_KERNEL);
	if (!pblk->lines) {
		ret = -ENOMEM;
		goto fail_free_chunk_meta;
	}

	for (i = 0; i < l_mg->nr_lines; i++) {
		line = &pblk->lines[i];

		ret = pblk_alloc_line_meta(pblk, line);
		if (ret)
			goto fail_free_lines;

		nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
	}

	if (!nr_free_chks) {
		pblk_err(pblk, "too many bad blocks prevent for sane instance\n");
		return -EINTR;
	}

	pblk_set_provision(pblk, nr_free_chks);

	kfree(chunk_meta);
	return 0;

fail_free_lines:
	while (--i >= 0)
		pblk_line_meta_free(l_mg, &pblk->lines[i]);
	kfree(pblk->lines);
fail_free_chunk_meta:
	kfree(chunk_meta);
fail_free_luns:
	kfree(pblk->luns);
fail_free_meta:
	pblk_line_mg_free(pblk);

	return ret;
}

static int pblk_writer_init(struct pblk *pblk)
{
	pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
	if (IS_ERR(pblk->writer_ts)) {
		int err = PTR_ERR(pblk->writer_ts);

		if (err != -EINTR)
			pblk_err(pblk, "could not allocate writer kthread (%d)\n",
					err);
		return err;
	}

	timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
	mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));

	return 0;
}

static void pblk_writer_stop(struct pblk *pblk)
{
	/* The pipeline must be stopped and the write buffer emptied before the
	 * write thread is stopped
	 */
	WARN(pblk_rb_read_count(&pblk->rwb),
			"Stopping not fully persisted write buffer\n");

	WARN(pblk_rb_sync_count(&pblk->rwb),
			"Stopping not fully synced write buffer\n");

	del_timer_sync(&pblk->wtimer);
	if (pblk->writer_ts)
		kthread_stop(pblk->writer_ts);
}

static void pblk_free(struct pblk *pblk)
{
	pblk_lines_free(pblk);
	pblk_l2p_free(pblk);
	pblk_rwb_free(pblk);
	pblk_core_free(pblk);

	kfree(pblk);
}

static void pblk_tear_down(struct pblk *pblk, bool graceful)
{
	if (graceful)
		__pblk_pipeline_flush(pblk);
	__pblk_pipeline_stop(pblk);
	pblk_writer_stop(pblk);
	pblk_rb_sync_l2p(&pblk->rwb);
	pblk_rl_free(&pblk->rl);

	pblk_debug(pblk, "consistent tear down (graceful:%d)\n", graceful);
}

static void pblk_exit(void *private, bool graceful)
{
	struct pblk *pblk = private;

	down_write(&pblk_lock);
	pblk_gc_exit(pblk, graceful);
	pblk_tear_down(pblk, graceful);

#ifdef CONFIG_NVM_PBLK_DEBUG
	pblk_info(pblk, "exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
#endif

	pblk_free(pblk);
	up_write(&pblk_lock);
}

static sector_t pblk_capacity(void *private)
{
	struct pblk *pblk = private;

	return pblk->capacity * NR_PHY_IN_LOG;
}

static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
		       int flags)
{
	struct nvm_geo *geo = &dev->geo;
	struct request_queue *bqueue = dev->q;
	struct request_queue *tqueue = tdisk->queue;
	struct pblk *pblk;
	int ret;

	pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
	if (!pblk)
		return ERR_PTR(-ENOMEM);

	pblk->dev = dev;
	pblk->disk = tdisk;
	pblk->state = PBLK_STATE_RUNNING;
	pblk->gc.gc_enabled = 0;

	if (!(geo->version == NVM_OCSSD_SPEC_12 ||
					geo->version == NVM_OCSSD_SPEC_20)) {
		pblk_err(pblk, "OCSSD version not supported (%u)\n",
							geo->version);
		kfree(pblk);
		return ERR_PTR(-EINVAL);
	}

	if (geo->version == NVM_OCSSD_SPEC_12 && geo->dom & NVM_RSP_L2P) {
		pblk_err(pblk, "host-side L2P table not supported. (%x)\n",
							geo->dom);
		kfree(pblk);
		return ERR_PTR(-EINVAL);
	}

	spin_lock_init(&pblk->resubmit_lock);
	spin_lock_init(&pblk->trans_lock);
	spin_lock_init(&pblk->lock);

#ifdef CONFIG_NVM_PBLK_DEBUG
	atomic_long_set(&pblk->inflight_writes, 0);
	atomic_long_set(&pblk->padded_writes, 0);
	atomic_long_set(&pblk->padded_wb, 0);
	atomic_long_set(&pblk->req_writes, 0);
	atomic_long_set(&pblk->sub_writes, 0);
	atomic_long_set(&pblk->sync_writes, 0);
	atomic_long_set(&pblk->inflight_reads, 0);
	atomic_long_set(&pblk->cache_reads, 0);
	atomic_long_set(&pblk->sync_reads, 0);
	atomic_long_set(&pblk->recov_writes, 0);
	atomic_long_set(&pblk->recov_writes, 0);
	atomic_long_set(&pblk->recov_gc_writes, 0);
	atomic_long_set(&pblk->recov_gc_reads, 0);
#endif

	atomic_long_set(&pblk->read_failed, 0);
	atomic_long_set(&pblk->read_empty, 0);
	atomic_long_set(&pblk->read_high_ecc, 0);
	atomic_long_set(&pblk->read_failed_gc, 0);
	atomic_long_set(&pblk->write_failed, 0);
	atomic_long_set(&pblk->erase_failed, 0);

	ret = pblk_core_init(pblk);
	if (ret) {
		pblk_err(pblk, "could not initialize core\n");
		goto fail;
	}

	ret = pblk_lines_init(pblk);
	if (ret) {
		pblk_err(pblk, "could not initialize lines\n");
		goto fail_free_core;
	}

	ret = pblk_rwb_init(pblk);
	if (ret) {
		pblk_err(pblk, "could not initialize write buffer\n");
		goto fail_free_lines;
	}

	ret = pblk_l2p_init(pblk, flags & NVM_TARGET_FACTORY);
	if (ret) {
		pblk_err(pblk, "could not initialize maps\n");
		goto fail_free_rwb;
	}

	ret = pblk_writer_init(pblk);
	if (ret) {
		if (ret != -EINTR)
			pblk_err(pblk, "could not initialize write thread\n");
		goto fail_free_l2p;
	}

	ret = pblk_gc_init(pblk);
	if (ret) {
		pblk_err(pblk, "could not initialize gc\n");
		goto fail_stop_writer;
	}

	/* inherit the size from the underlying device */
	blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
	blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));

	blk_queue_write_cache(tqueue, true, false);

	tqueue->limits.discard_granularity = geo->clba * geo->csecs;
	tqueue->limits.discard_alignment = 0;
	blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
	blk_queue_flag_set(QUEUE_FLAG_DISCARD, tqueue);

	pblk_info(pblk, "luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
			geo->all_luns, pblk->l_mg.nr_lines,
			(unsigned long long)pblk->rl.nr_secs,
			pblk->rwb.nr_entries);

	wake_up_process(pblk->writer_ts);

	/* Check if we need to start GC */
	pblk_gc_should_kick(pblk);

	return pblk;

fail_stop_writer:
	pblk_writer_stop(pblk);
fail_free_l2p:
	pblk_l2p_free(pblk);
fail_free_rwb:
	pblk_rwb_free(pblk);
fail_free_lines:
	pblk_lines_free(pblk);
fail_free_core:
	pblk_core_free(pblk);
fail:
	kfree(pblk);
	return ERR_PTR(ret);
}

/* physical block device target */
static struct nvm_tgt_type tt_pblk = {
	.name		= "pblk",
	.version	= {1, 0, 0},

	.make_rq	= pblk_make_rq,
	.capacity	= pblk_capacity,

	.init		= pblk_init,
	.exit		= pblk_exit,

	.sysfs_init	= pblk_sysfs_init,
	.sysfs_exit	= pblk_sysfs_exit,
	.owner		= THIS_MODULE,
};

static int __init pblk_module_init(void)
{
	int ret;

	ret = bioset_init(&pblk_bio_set, BIO_POOL_SIZE, 0, 0);
	if (ret)
		return ret;
	ret = nvm_register_tgt_type(&tt_pblk);
	if (ret)
		bioset_exit(&pblk_bio_set);
	return ret;
}

static void pblk_module_exit(void)
{
	bioset_exit(&pblk_bio_set);
	nvm_unregister_tgt_type(&tt_pblk);
}

module_init(pblk_module_init);
module_exit(pblk_module_exit);
MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");