summaryrefslogtreecommitdiff
path: root/drivers/lightnvm/pblk.h
blob: a6386d5acd73a1faaaf8582b9589ab043cf96eef (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
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2015 IT University of Copenhagen (rrpc.h)
 * Copyright (C) 2016 CNEX Labs
 * Initial release: Matias Bjorling <matias@cnexlabs.com>
 * Write buffering: Javier Gonzalez <javier@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.
 *
 */

#ifndef PBLK_H_
#define PBLK_H_

#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/vmalloc.h>
#include <linux/crc32.h>
#include <linux/uuid.h>

#include <linux/lightnvm.h>

/* Run only GC if less than 1/X blocks are free */
#define GC_LIMIT_INVERSE 5
#define GC_TIME_MSECS 1000

#define PBLK_SECTOR (512)
#define PBLK_EXPOSED_PAGE_SIZE (4096)

#define PBLK_NR_CLOSE_JOBS (4)

#define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16)

#define PBLK_COMMAND_TIMEOUT_MS 30000

/* Max 512 LUNs per device */
#define PBLK_MAX_LUNS_BITMAP (4)

#define NR_PHY_IN_LOG (PBLK_EXPOSED_PAGE_SIZE / PBLK_SECTOR)

/* Static pool sizes */
#define PBLK_GEN_WS_POOL_SIZE (2)

#define PBLK_DEFAULT_OP (11)

enum {
	PBLK_READ		= READ,
	PBLK_WRITE		= WRITE,/* Write from write buffer */
	PBLK_WRITE_INT,			/* Internal write - no write buffer */
	PBLK_READ_RECOV,		/* Recovery read - errors allowed */
	PBLK_ERASE,
};

enum {
	/* IO Types */
	PBLK_IOTYPE_USER	= 1 << 0,
	PBLK_IOTYPE_GC		= 1 << 1,

	/* Write buffer flags */
	PBLK_FLUSH_ENTRY	= 1 << 2,
	PBLK_WRITTEN_DATA	= 1 << 3,
	PBLK_SUBMITTED_ENTRY	= 1 << 4,
	PBLK_WRITABLE_ENTRY	= 1 << 5,
};

enum {
	PBLK_BLK_ST_OPEN =	0x1,
	PBLK_BLK_ST_CLOSED =	0x2,
};

enum {
	PBLK_CHUNK_RESET_START,
	PBLK_CHUNK_RESET_DONE,
	PBLK_CHUNK_RESET_FAILED,
};

struct pblk_sec_meta {
	u64 reserved;
	__le64 lba;
};

/* The number of GC lists and the rate-limiter states go together. This way the
 * rate-limiter can dictate how much GC is needed based on resource utilization.
 */
#define PBLK_GC_NR_LISTS 4

enum {
	PBLK_RL_OFF = 0,
	PBLK_RL_WERR = 1,
	PBLK_RL_HIGH = 2,
	PBLK_RL_MID = 3,
	PBLK_RL_LOW = 4
};

#define pblk_dma_ppa_size (sizeof(u64) * NVM_MAX_VLBA)

/* write buffer completion context */
struct pblk_c_ctx {
	struct list_head list;		/* Head for out-of-order completion */

	unsigned long *lun_bitmap;	/* Luns used on current request */
	unsigned int sentry;
	unsigned int nr_valid;
	unsigned int nr_padded;
};

/* read context */
struct pblk_g_ctx {
	void *private;
	unsigned long start_time;
	u64 lba;
};

/* partial read context */
struct pblk_pr_ctx {
	struct bio *orig_bio;
	DECLARE_BITMAP(bitmap, NVM_MAX_VLBA);
	unsigned int orig_nr_secs;
	unsigned int bio_init_idx;
	void *ppa_ptr;
	dma_addr_t dma_ppa_list;
	u64 lba_list_mem[NVM_MAX_VLBA];
	u64 lba_list_media[NVM_MAX_VLBA];
};

/* Pad context */
struct pblk_pad_rq {
	struct pblk *pblk;
	struct completion wait;
	struct kref ref;
};

/* Recovery context */
struct pblk_rec_ctx {
	struct pblk *pblk;
	struct nvm_rq *rqd;
	struct work_struct ws_rec;
};

/* Write context */
struct pblk_w_ctx {
	struct bio_list bios;		/* Original bios - used for completion
					 * in REQ_FUA, REQ_FLUSH case
					 */
	u64 lba;			/* Logic addr. associated with entry */
	struct ppa_addr ppa;		/* Physic addr. associated with entry */
	int flags;			/* Write context flags */
};

struct pblk_rb_entry {
	struct ppa_addr cacheline;	/* Cacheline for this entry */
	void *data;			/* Pointer to data on this entry */
	struct pblk_w_ctx w_ctx;	/* Context for this entry */
	struct list_head index;		/* List head to enable indexes */
};

#define EMPTY_ENTRY (~0U)

struct pblk_rb_pages {
	struct page *pages;
	int order;
	struct list_head list;
};

struct pblk_rb {
	struct pblk_rb_entry *entries;	/* Ring buffer entries */
	unsigned int mem;		/* Write offset - points to next
					 * writable entry in memory
					 */
	unsigned int subm;		/* Read offset - points to last entry
					 * that has been submitted to the media
					 * to be persisted
					 */
	unsigned int sync;		/* Synced - backpointer that signals
					 * the last submitted entry that has
					 * been successfully persisted to media
					 */
	unsigned int flush_point;	/* Sync point - last entry that must be
					 * flushed to the media. Used with
					 * REQ_FLUSH and REQ_FUA
					 */
	unsigned int l2p_update;	/* l2p update point - next entry for
					 * which l2p mapping will be updated to
					 * contain a device ppa address (instead
					 * of a cacheline
					 */
	unsigned int nr_entries;	/* Number of entries in write buffer -
					 * must be a power of two
					 */
	unsigned int seg_size;		/* Size of the data segments being
					 * stored on each entry. Typically this
					 * will be 4KB
					 */

	unsigned int back_thres;	/* Threshold that shall be maintained by
					 * the backpointer in order to respect
					 * geo->mw_cunits on a per chunk basis
					 */

	struct list_head pages;		/* List of data pages */

	spinlock_t w_lock;		/* Write lock */
	spinlock_t s_lock;		/* Sync lock */

#ifdef CONFIG_NVM_PBLK_DEBUG
	atomic_t inflight_flush_point;	/* Not served REQ_FLUSH | REQ_FUA */
#endif
};

#define PBLK_RECOVERY_SECTORS 16

struct pblk_lun {
	struct ppa_addr bppa;
	struct semaphore wr_sem;
};

struct pblk_gc_rq {
	struct pblk_line *line;
	void *data;
	u64 paddr_list[NVM_MAX_VLBA];
	u64 lba_list[NVM_MAX_VLBA];
	int nr_secs;
	int secs_to_gc;
	struct list_head list;
};

struct pblk_gc {
	/* These states are not protected by a lock since (i) they are in the
	 * fast path, and (ii) they are not critical.
	 */
	int gc_active;
	int gc_enabled;
	int gc_forced;

	struct task_struct *gc_ts;
	struct task_struct *gc_writer_ts;
	struct task_struct *gc_reader_ts;

	struct workqueue_struct *gc_line_reader_wq;
	struct workqueue_struct *gc_reader_wq;

	struct timer_list gc_timer;

	struct semaphore gc_sem;
	atomic_t read_inflight_gc; /* Number of lines with inflight GC reads */
	atomic_t pipeline_gc;	   /* Number of lines in the GC pipeline -
				    * started reads to finished writes
				    */
	int w_entries;

	struct list_head w_list;
	struct list_head r_list;

	spinlock_t lock;
	spinlock_t w_lock;
	spinlock_t r_lock;
};

struct pblk_rl {
	unsigned int high;	/* Upper threshold for rate limiter (free run -
				 * user I/O rate limiter
				 */
	unsigned int high_pw;	/* High rounded up as a power of 2 */

#define PBLK_USER_HIGH_THRS 8	/* Begin write limit at 12% available blks */
#define PBLK_USER_LOW_THRS 10	/* Aggressive GC at 10% available blocks */

	int rb_windows_pw;	/* Number of rate windows in the write buffer
				 * given as a power-of-2. This guarantees that
				 * when user I/O is being rate limited, there
				 * will be reserved enough space for the GC to
				 * place its payload. A window is of
				 * pblk->max_write_pgs size, which in NVMe is
				 * 64, i.e., 256kb.
				 */
	int rb_budget;		/* Total number of entries available for I/O */
	int rb_user_max;	/* Max buffer entries available for user I/O */
	int rb_gc_max;		/* Max buffer entries available for GC I/O */
	int rb_gc_rsv;		/* Reserved buffer entries for GC I/O */
	int rb_state;		/* Rate-limiter current state */
	int rb_max_io;		/* Maximum size for an I/O giving the config */

	atomic_t rb_user_cnt;	/* User I/O buffer counter */
	atomic_t rb_gc_cnt;	/* GC I/O buffer counter */
	atomic_t rb_space;	/* Space limit in case of reaching capacity */

	int rsv_blocks;		/* Reserved blocks for GC */

	int rb_user_active;
	int rb_gc_active;

	atomic_t werr_lines;	/* Number of write error lines that needs gc */

	struct timer_list u_timer;

	unsigned long long nr_secs;
	unsigned long total_blocks;

	atomic_t free_blocks;		/* Total number of free blocks (+ OP) */
	atomic_t free_user_blocks;	/* Number of user free blocks (no OP) */
};

#define PBLK_LINE_EMPTY (~0U)

enum {
	/* Line Types */
	PBLK_LINETYPE_FREE = 0,
	PBLK_LINETYPE_LOG = 1,
	PBLK_LINETYPE_DATA = 2,

	/* Line state */
	PBLK_LINESTATE_NEW = 9,
	PBLK_LINESTATE_FREE = 10,
	PBLK_LINESTATE_OPEN = 11,
	PBLK_LINESTATE_CLOSED = 12,
	PBLK_LINESTATE_GC = 13,
	PBLK_LINESTATE_BAD = 14,
	PBLK_LINESTATE_CORRUPT = 15,

	/* GC group */
	PBLK_LINEGC_NONE = 20,
	PBLK_LINEGC_EMPTY = 21,
	PBLK_LINEGC_LOW = 22,
	PBLK_LINEGC_MID = 23,
	PBLK_LINEGC_HIGH = 24,
	PBLK_LINEGC_FULL = 25,
	PBLK_LINEGC_WERR = 26
};

#define PBLK_MAGIC 0x70626c6b /*pblk*/

/* emeta/smeta persistent storage format versions:
 * Changes in major version requires offline migration.
 * Changes in minor version are handled automatically during
 * recovery.
 */

#define SMETA_VERSION_MAJOR (0)
#define SMETA_VERSION_MINOR (1)

#define EMETA_VERSION_MAJOR (0)
#define EMETA_VERSION_MINOR (2)

struct line_header {
	__le32 crc;
	__le32 identifier;	/* pblk identifier */
	__u8 uuid[16];		/* instance uuid */
	__le16 type;		/* line type */
	__u8 version_major;	/* version major */
	__u8 version_minor;	/* version minor */
	__le32 id;		/* line id for current line */
};

struct line_smeta {
	struct line_header header;

	__le32 crc;		/* Full structure including struct crc */
	/* Previous line metadata */
	__le32 prev_id;		/* Line id for previous line */

	/* Current line metadata */
	__le64 seq_nr;		/* Sequence number for current line */

	/* Active writers */
	__le32 window_wr_lun;	/* Number of parallel LUNs to write */

	__le32 rsvd[2];

	__le64 lun_bitmap[];
};


/*
 * Metadata layout in media:
 *	First sector:
 *		1. struct line_emeta
 *		2. bad block bitmap (u64 * window_wr_lun)
 *		3. write amplification counters
 *	Mid sectors (start at lbas_sector):
 *		3. nr_lbas (u64) forming lba list
 *	Last sectors (start at vsc_sector):
 *		4. u32 valid sector count (vsc) for all lines (~0U: free line)
 */
struct line_emeta {
	struct line_header header;

	__le32 crc;		/* Full structure including struct crc */

	/* Previous line metadata */
	__le32 prev_id;		/* Line id for prev line */

	/* Current line metadata */
	__le64 seq_nr;		/* Sequence number for current line */

	/* Active writers */
	__le32 window_wr_lun;	/* Number of parallel LUNs to write */

	/* Bookkeeping for recovery */
	__le32 next_id;		/* Line id for next line */
	__le64 nr_lbas;		/* Number of lbas mapped in line */
	__le64 nr_valid_lbas;	/* Number of valid lbas mapped in line */
	__le64 bb_bitmap[];     /* Updated bad block bitmap for line */
};


/* Write amplification counters stored on media */
struct wa_counters {
	__le64 user;		/* Number of user written sectors */
	__le64 gc;		/* Number of sectors written by GC*/
	__le64 pad;		/* Number of padded sectors */
};

struct pblk_emeta {
	struct line_emeta *buf;		/* emeta buffer in media format */
	int mem;			/* Write offset - points to next
					 * writable entry in memory
					 */
	atomic_t sync;			/* Synced - backpointer that signals the
					 * last entry that has been successfully
					 * persisted to media
					 */
	unsigned int nr_entries;	/* Number of emeta entries */
};

struct pblk_smeta {
	struct line_smeta *buf;		/* smeta buffer in persistent format */
};

struct pblk_w_err_gc {
	int has_write_err;
	__le64 *lba_list;
};

struct pblk_line {
	struct pblk *pblk;
	unsigned int id;		/* Line number corresponds to the
					 * block line
					 */
	unsigned int seq_nr;		/* Unique line sequence number */

	int state;			/* PBLK_LINESTATE_X */
	int type;			/* PBLK_LINETYPE_X */
	int gc_group;			/* PBLK_LINEGC_X */
	struct list_head list;		/* Free, GC lists */

	unsigned long *lun_bitmap;	/* Bitmap for LUNs mapped in line */

	struct nvm_chk_meta *chks;	/* Chunks forming line */

	struct pblk_smeta *smeta;	/* Start metadata */
	struct pblk_emeta *emeta;	/* End medatada */

	int meta_line;			/* Metadata line id */
	int meta_distance;		/* Distance between data and metadata */

	u64 smeta_ssec;			/* Sector where smeta starts */
	u64 emeta_ssec;			/* Sector where emeta starts */

	unsigned int sec_in_line;	/* Number of usable secs in line */

	atomic_t blk_in_line;		/* Number of good blocks in line */
	unsigned long *blk_bitmap;	/* Bitmap for valid/invalid blocks */
	unsigned long *erase_bitmap;	/* Bitmap for erased blocks */

	unsigned long *map_bitmap;	/* Bitmap for mapped sectors in line */
	unsigned long *invalid_bitmap;	/* Bitmap for invalid sectors in line */

	atomic_t left_eblks;		/* Blocks left for erasing */
	atomic_t left_seblks;		/* Blocks left for sync erasing */

	int left_msecs;			/* Sectors left for mapping */
	unsigned int cur_sec;		/* Sector map pointer */
	unsigned int nr_valid_lbas;	/* Number of valid lbas in line */

	__le32 *vsc;			/* Valid sector count in line */

	struct kref ref;		/* Write buffer L2P references */

	struct pblk_w_err_gc *w_err_gc;	/* Write error gc recovery metadata */

	spinlock_t lock;		/* Necessary for invalid_bitmap only */
};

#define PBLK_DATA_LINES 4

enum {
	PBLK_KMALLOC_META = 1,
	PBLK_VMALLOC_META = 2,
};

enum {
	PBLK_EMETA_TYPE_HEADER = 1,	/* struct line_emeta first sector */
	PBLK_EMETA_TYPE_LLBA = 2,	/* lba list - type: __le64 */
	PBLK_EMETA_TYPE_VSC = 3,	/* vsc list - type: __le32 */
};

struct pblk_line_mgmt {
	int nr_lines;			/* Total number of full lines */
	int nr_free_lines;		/* Number of full lines in free list */

	/* Free lists - use free_lock */
	struct list_head free_list;	/* Full lines ready to use */
	struct list_head corrupt_list;	/* Full lines corrupted */
	struct list_head bad_list;	/* Full lines bad */

	/* GC lists - use gc_lock */
	struct list_head *gc_lists[PBLK_GC_NR_LISTS];
	struct list_head gc_high_list;	/* Full lines ready to GC, high isc */
	struct list_head gc_mid_list;	/* Full lines ready to GC, mid isc */
	struct list_head gc_low_list;	/* Full lines ready to GC, low isc */

	struct list_head gc_werr_list;  /* Write err recovery list */

	struct list_head gc_full_list;	/* Full lines ready to GC, no valid */
	struct list_head gc_empty_list;	/* Full lines close, all valid */

	struct pblk_line *log_line;	/* Current FTL log line */
	struct pblk_line *data_line;	/* Current data line */
	struct pblk_line *log_next;	/* Next FTL log line */
	struct pblk_line *data_next;	/* Next data line */

	struct list_head emeta_list;	/* Lines queued to schedule emeta */

	__le32 *vsc_list;		/* Valid sector counts for all lines */

	/* Metadata allocation type: VMALLOC | KMALLOC */
	int emeta_alloc_type;

	/* Pre-allocated metadata for data lines */
	struct pblk_smeta *sline_meta[PBLK_DATA_LINES];
	struct pblk_emeta *eline_meta[PBLK_DATA_LINES];
	unsigned long meta_bitmap;

	/* Cache and mempool for map/invalid bitmaps */
	struct kmem_cache *bitmap_cache;
	mempool_t *bitmap_pool;

	/* Helpers for fast bitmap calculations */
	unsigned long *bb_template;
	unsigned long *bb_aux;

	unsigned long d_seq_nr;		/* Data line unique sequence number */
	unsigned long l_seq_nr;		/* Log line unique sequence number */

	spinlock_t free_lock;
	spinlock_t close_lock;
	spinlock_t gc_lock;
};

struct pblk_line_meta {
	unsigned int smeta_len;		/* Total length for smeta */
	unsigned int smeta_sec;		/* Sectors needed for smeta */

	unsigned int emeta_len[4];	/* Lengths for emeta:
					 *  [0]: Total
					 *  [1]: struct line_emeta +
					 *       bb_bitmap + struct wa_counters
					 *  [2]: L2P portion
					 *  [3]: vsc
					 */
	unsigned int emeta_sec[4];	/* Sectors needed for emeta. Same layout
					 * as emeta_len
					 */

	unsigned int emeta_bb;		/* Boundary for bb that affects emeta */

	unsigned int vsc_list_len;	/* Length for vsc list */
	unsigned int sec_bitmap_len;	/* Length for sector bitmap in line */
	unsigned int blk_bitmap_len;	/* Length for block bitmap in line */
	unsigned int lun_bitmap_len;	/* Length for lun bitmap in line */

	unsigned int blk_per_line;	/* Number of blocks in a full line */
	unsigned int sec_per_line;	/* Number of sectors in a line */
	unsigned int dsec_per_line;	/* Number of data sectors in a line */
	unsigned int min_blk_line;	/* Min. number of good blocks in line */

	unsigned int mid_thrs;		/* Threshold for GC mid list */
	unsigned int high_thrs;		/* Threshold for GC high list */

	unsigned int meta_distance;	/* Distance between data and metadata */
};

enum {
	PBLK_STATE_RUNNING = 0,
	PBLK_STATE_STOPPING = 1,
	PBLK_STATE_RECOVERING = 2,
	PBLK_STATE_STOPPED = 3,
};

/* Internal format to support not power-of-2 device formats */
struct pblk_addrf {
	/* gen to dev */
	int sec_stripe;
	int ch_stripe;
	int lun_stripe;

	/* dev to gen */
	int sec_lun_stripe;
	int sec_ws_stripe;
};

struct pblk {
	struct nvm_tgt_dev *dev;
	struct gendisk *disk;

	struct kobject kobj;

	struct pblk_lun *luns;

	struct pblk_line *lines;		/* Line array */
	struct pblk_line_mgmt l_mg;		/* Line management */
	struct pblk_line_meta lm;		/* Line metadata */

	struct nvm_addrf addrf;		/* Aligned address format */
	struct pblk_addrf uaddrf;	/* Unaligned address format */
	int addrf_len;

	struct pblk_rb rwb;

	int state;			/* pblk line state */

	int min_write_pgs; /* Minimum amount of pages required by controller */
	int min_write_pgs_data; /* Minimum amount of payload pages */
	int max_write_pgs; /* Maximum amount of pages supported by controller */
	int oob_meta_size; /* Size of OOB sector metadata */

	sector_t capacity; /* Device capacity when bad blocks are subtracted */

	int op;      /* Percentage of device used for over-provisioning */
	int op_blks; /* Number of blocks used for over-provisioning */

	/* pblk provisioning values. Used by rate limiter */
	struct pblk_rl rl;

	int sec_per_write;

	guid_t instance_uuid;

	/* Persistent write amplification counters, 4kb sector I/Os */
	atomic64_t user_wa;		/* Sectors written by user */
	atomic64_t gc_wa;		/* Sectors written by GC */
	atomic64_t pad_wa;		/* Padded sectors written */

	/* Reset values for delta write amplification measurements */
	u64 user_rst_wa;
	u64 gc_rst_wa;
	u64 pad_rst_wa;

	/* Counters used for calculating padding distribution */
	atomic64_t *pad_dist;		/* Padding distribution buckets */
	u64 nr_flush_rst;		/* Flushes reset value for pad dist.*/
	atomic64_t nr_flush;		/* Number of flush/fua I/O */

#ifdef CONFIG_NVM_PBLK_DEBUG
	/* Non-persistent debug counters, 4kb sector I/Os */
	atomic_long_t inflight_writes;	/* Inflight writes (user and gc) */
	atomic_long_t padded_writes;	/* Sectors padded due to flush/fua */
	atomic_long_t padded_wb;	/* Sectors padded in write buffer */
	atomic_long_t req_writes;	/* Sectors stored on write buffer */
	atomic_long_t sub_writes;	/* Sectors submitted from buffer */
	atomic_long_t sync_writes;	/* Sectors synced to media */
	atomic_long_t inflight_reads;	/* Inflight sector read requests */
	atomic_long_t cache_reads;	/* Read requests that hit the cache */
	atomic_long_t sync_reads;	/* Completed sector read requests */
	atomic_long_t recov_writes;	/* Sectors submitted from recovery */
	atomic_long_t recov_gc_writes;	/* Sectors submitted from write GC */
	atomic_long_t recov_gc_reads;	/* Sectors submitted from read GC */
#endif

	spinlock_t lock;

	atomic_long_t read_failed;
	atomic_long_t read_empty;
	atomic_long_t read_high_ecc;
	atomic_long_t read_failed_gc;
	atomic_long_t write_failed;
	atomic_long_t erase_failed;

	atomic_t inflight_io;		/* General inflight I/O counter */

	struct task_struct *writer_ts;

	/* Simple translation map of logical addresses to physical addresses.
	 * The logical addresses is known by the host system, while the physical
	 * addresses are used when writing to the disk block device.
	 */
	unsigned char *trans_map;
	spinlock_t trans_lock;

	struct list_head compl_list;

	spinlock_t resubmit_lock;	 /* Resubmit list lock */
	struct list_head resubmit_list; /* Resubmit list for failed writes*/

	mempool_t page_bio_pool;
	mempool_t gen_ws_pool;
	mempool_t rec_pool;
	mempool_t r_rq_pool;
	mempool_t w_rq_pool;
	mempool_t e_rq_pool;

	struct workqueue_struct *close_wq;
	struct workqueue_struct *bb_wq;
	struct workqueue_struct *r_end_wq;

	struct timer_list wtimer;

	struct pblk_gc gc;
};

struct pblk_line_ws {
	struct pblk *pblk;
	struct pblk_line *line;
	void *priv;
	struct work_struct ws;
};

#define pblk_g_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_g_ctx))
#define pblk_w_rq_size (sizeof(struct nvm_rq) + sizeof(struct pblk_c_ctx))

#define pblk_err(pblk, fmt, ...)			\
	pr_err("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
#define pblk_info(pblk, fmt, ...)			\
	pr_info("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
#define pblk_warn(pblk, fmt, ...)			\
	pr_warn("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)
#define pblk_debug(pblk, fmt, ...)			\
	pr_debug("pblk %s: " fmt, pblk->disk->disk_name, ##__VA_ARGS__)

/*
 * pblk ring buffer operations
 */
int pblk_rb_init(struct pblk_rb *rb, unsigned int size, unsigned int threshold,
		 unsigned int seg_sz);
int pblk_rb_may_write_user(struct pblk_rb *rb, struct bio *bio,
			   unsigned int nr_entries, unsigned int *pos);
int pblk_rb_may_write_gc(struct pblk_rb *rb, unsigned int nr_entries,
			 unsigned int *pos);
void pblk_rb_write_entry_user(struct pblk_rb *rb, void *data,
			      struct pblk_w_ctx w_ctx, unsigned int pos);
void pblk_rb_write_entry_gc(struct pblk_rb *rb, void *data,
			    struct pblk_w_ctx w_ctx, struct pblk_line *line,
			    u64 paddr, unsigned int pos);
struct pblk_w_ctx *pblk_rb_w_ctx(struct pblk_rb *rb, unsigned int pos);
void pblk_rb_flush(struct pblk_rb *rb);

void pblk_rb_sync_l2p(struct pblk_rb *rb);
unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
				 unsigned int pos, unsigned int nr_entries,
				 unsigned int count);
int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
			struct ppa_addr ppa, int bio_iter, bool advanced_bio);
unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int entries);

unsigned int pblk_rb_sync_init(struct pblk_rb *rb, unsigned long *flags);
unsigned int pblk_rb_sync_advance(struct pblk_rb *rb, unsigned int nr_entries);
unsigned int pblk_rb_ptr_wrap(struct pblk_rb *rb, unsigned int p,
			      unsigned int nr_entries);
void pblk_rb_sync_end(struct pblk_rb *rb, unsigned long *flags);
unsigned int pblk_rb_flush_point_count(struct pblk_rb *rb);

unsigned int pblk_rb_read_count(struct pblk_rb *rb);
unsigned int pblk_rb_sync_count(struct pblk_rb *rb);
unsigned int pblk_rb_wrap_pos(struct pblk_rb *rb, unsigned int pos);

int pblk_rb_tear_down_check(struct pblk_rb *rb);
int pblk_rb_pos_oob(struct pblk_rb *rb, u64 pos);
void pblk_rb_free(struct pblk_rb *rb);
ssize_t pblk_rb_sysfs(struct pblk_rb *rb, char *buf);

/*
 * pblk core
 */
struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type);
void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type);
int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd);
void pblk_free_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd);
void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write);
int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd,
			struct pblk_c_ctx *c_ctx);
void pblk_discard(struct pblk *pblk, struct bio *bio);
struct nvm_chk_meta *pblk_get_chunk_meta(struct pblk *pblk);
struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
					      struct nvm_chk_meta *lp,
					      struct ppa_addr ppa);
void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd);
void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line);
void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd);
struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
			      unsigned int nr_secs, unsigned int len,
			      int alloc_type, gfp_t gfp_mask);
struct pblk_line *pblk_line_get(struct pblk *pblk);
struct pblk_line *pblk_line_get_first_data(struct pblk *pblk);
struct pblk_line *pblk_line_replace_data(struct pblk *pblk);
void pblk_ppa_to_line_put(struct pblk *pblk, struct ppa_addr ppa);
void pblk_rq_to_line_put(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line);
void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line);
struct pblk_line *pblk_line_get_data(struct pblk *pblk);
struct pblk_line *pblk_line_get_erase(struct pblk *pblk);
int pblk_line_erase(struct pblk *pblk, struct pblk_line *line);
int pblk_line_is_full(struct pblk_line *line);
void pblk_line_free(struct pblk_line *line);
void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line);
void pblk_line_close(struct pblk *pblk, struct pblk_line *line);
void pblk_line_close_ws(struct work_struct *work);
void pblk_pipeline_stop(struct pblk *pblk);
void __pblk_pipeline_stop(struct pblk *pblk);
void __pblk_pipeline_flush(struct pblk *pblk);
void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
		     void (*work)(struct work_struct *), gfp_t gfp_mask,
		     struct workqueue_struct *wq);
u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line);
int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line);
int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
			 void *emeta_buf);
int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr erase_ppa);
void pblk_line_put(struct kref *ref);
void pblk_line_put_wq(struct kref *ref);
struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line);
u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line);
void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
		   unsigned long secs_to_flush, bool skip_meta);
void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa,
		  unsigned long *lun_bitmap);
void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa);
void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa);
void pblk_up_rq(struct pblk *pblk, unsigned long *lun_bitmap);
int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
		       int nr_pages);
void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
			 int nr_pages);
void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa);
void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
			   u64 paddr);
void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa);
void pblk_update_map_cache(struct pblk *pblk, sector_t lba,
			   struct ppa_addr ppa);
void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
			 struct ppa_addr ppa, struct ppa_addr entry_line);
int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa,
		       struct pblk_line *gc_line, u64 paddr);
void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
			  u64 *lba_list, int nr_secs);
void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
			 sector_t blba, int nr_secs);
void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd);
void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd);

/*
 * pblk user I/O write path
 */
int pblk_write_to_cache(struct pblk *pblk, struct bio *bio,
			unsigned long flags);
int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq);

/*
 * pblk map
 */
int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd,
		       unsigned int sentry, unsigned long *lun_bitmap,
		       unsigned int valid_secs, struct ppa_addr *erase_ppa);
int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry,
		 unsigned long *lun_bitmap, unsigned int valid_secs,
		 unsigned int off);

/*
 * pblk write thread
 */
int pblk_write_ts(void *data);
void pblk_write_timer_fn(struct timer_list *t);
void pblk_write_should_kick(struct pblk *pblk);
void pblk_write_kick(struct pblk *pblk);

/*
 * pblk read path
 */
extern struct bio_set pblk_bio_set;
int pblk_submit_read(struct pblk *pblk, struct bio *bio);
int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq);
/*
 * pblk recovery
 */
struct pblk_line *pblk_recov_l2p(struct pblk *pblk);
int pblk_recov_pad(struct pblk *pblk);
int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta);

/*
 * pblk gc
 */
#define PBLK_GC_MAX_READERS 8	/* Max number of outstanding GC reader jobs */
#define PBLK_GC_RQ_QD 128	/* Queue depth for inflight GC requests */
#define PBLK_GC_L_QD 4		/* Queue depth for inflight GC lines */

int pblk_gc_init(struct pblk *pblk);
void pblk_gc_exit(struct pblk *pblk, bool graceful);
void pblk_gc_should_start(struct pblk *pblk);
void pblk_gc_should_stop(struct pblk *pblk);
void pblk_gc_should_kick(struct pblk *pblk);
void pblk_gc_free_full_lines(struct pblk *pblk);
void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled,
			      int *gc_active);
int pblk_gc_sysfs_force(struct pblk *pblk, int force);

/*
 * pblk rate limiter
 */
void pblk_rl_init(struct pblk_rl *rl, int budget, int threshold);
void pblk_rl_free(struct pblk_rl *rl);
void pblk_rl_update_rates(struct pblk_rl *rl);
int pblk_rl_high_thrs(struct pblk_rl *rl);
unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl);
unsigned long pblk_rl_nr_user_free_blks(struct pblk_rl *rl);
int pblk_rl_user_may_insert(struct pblk_rl *rl, int nr_entries);
void pblk_rl_inserted(struct pblk_rl *rl, int nr_entries);
void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries);
int pblk_rl_gc_may_insert(struct pblk_rl *rl, int nr_entries);
void pblk_rl_gc_in(struct pblk_rl *rl, int nr_entries);
void pblk_rl_out(struct pblk_rl *rl, int nr_user, int nr_gc);
int pblk_rl_max_io(struct pblk_rl *rl);
void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line);
void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line,
			    bool used);
int pblk_rl_is_limit(struct pblk_rl *rl);

void pblk_rl_werr_line_in(struct pblk_rl *rl);
void pblk_rl_werr_line_out(struct pblk_rl *rl);

/*
 * pblk sysfs
 */
int pblk_sysfs_init(struct gendisk *tdisk);
void pblk_sysfs_exit(struct gendisk *tdisk);

static inline void *pblk_malloc(size_t size, int type, gfp_t flags)
{
	if (type == PBLK_KMALLOC_META)
		return kmalloc(size, flags);
	return vmalloc(size);
}

static inline void pblk_mfree(void *ptr, int type)
{
	if (type == PBLK_KMALLOC_META)
		kfree(ptr);
	else
		vfree(ptr);
}

static inline struct nvm_rq *nvm_rq_from_c_ctx(void *c_ctx)
{
	return c_ctx - sizeof(struct nvm_rq);
}

static inline void *emeta_to_bb(struct line_emeta *emeta)
{
	return emeta->bb_bitmap;
}

static inline void *emeta_to_wa(struct pblk_line_meta *lm,
				struct line_emeta *emeta)
{
	return emeta->bb_bitmap + lm->blk_bitmap_len;
}

static inline void *emeta_to_lbas(struct pblk *pblk, struct line_emeta *emeta)
{
	return ((void *)emeta + pblk->lm.emeta_len[1]);
}

static inline void *emeta_to_vsc(struct pblk *pblk, struct line_emeta *emeta)
{
	return (emeta_to_lbas(pblk, emeta) + pblk->lm.emeta_len[2]);
}

static inline int pblk_line_vsc(struct pblk_line *line)
{
	return le32_to_cpu(*line->vsc);
}

static inline int pblk_ppa_to_line_id(struct ppa_addr p)
{
	return p.a.blk;
}

static inline struct pblk_line *pblk_ppa_to_line(struct pblk *pblk,
						 struct ppa_addr p)
{
	return &pblk->lines[pblk_ppa_to_line_id(p)];
}

static inline int pblk_ppa_to_pos(struct nvm_geo *geo, struct ppa_addr p)
{
	return p.a.lun * geo->num_ch + p.a.ch;
}

static inline struct ppa_addr addr_to_gen_ppa(struct pblk *pblk, u64 paddr,
					      u64 line_id)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct ppa_addr ppa;

	if (geo->version == NVM_OCSSD_SPEC_12) {
		struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&pblk->addrf;

		ppa.ppa = 0;
		ppa.g.blk = line_id;
		ppa.g.pg = (paddr & ppaf->pg_mask) >> ppaf->pg_offset;
		ppa.g.lun = (paddr & ppaf->lun_mask) >> ppaf->lun_offset;
		ppa.g.ch = (paddr & ppaf->ch_mask) >> ppaf->ch_offset;
		ppa.g.pl = (paddr & ppaf->pln_mask) >> ppaf->pln_offset;
		ppa.g.sec = (paddr & ppaf->sec_mask) >> ppaf->sec_offset;
	} else {
		struct pblk_addrf *uaddrf = &pblk->uaddrf;
		int secs, chnls, luns;

		ppa.ppa = 0;

		ppa.m.chk = line_id;

		paddr = div_u64_rem(paddr, uaddrf->sec_stripe, &secs);
		ppa.m.sec = secs;

		paddr = div_u64_rem(paddr, uaddrf->ch_stripe, &chnls);
		ppa.m.grp = chnls;

		paddr = div_u64_rem(paddr, uaddrf->lun_stripe, &luns);
		ppa.m.pu = luns;

		ppa.m.sec += uaddrf->sec_stripe * paddr;
	}

	return ppa;
}

static inline struct nvm_chk_meta *pblk_dev_ppa_to_chunk(struct pblk *pblk,
							struct ppa_addr p)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line *line = pblk_ppa_to_line(pblk, p);
	int pos = pblk_ppa_to_pos(geo, p);

	return &line->chks[pos];
}

static inline u64 pblk_dev_ppa_to_chunk_addr(struct pblk *pblk,
							struct ppa_addr p)
{
	struct nvm_tgt_dev *dev = pblk->dev;

	return dev_to_chunk_addr(dev->parent, &pblk->addrf, p);
}

static inline u64 pblk_dev_ppa_to_line_addr(struct pblk *pblk,
							struct ppa_addr p)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	u64 paddr;

	if (geo->version == NVM_OCSSD_SPEC_12) {
		struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&pblk->addrf;

		paddr = (u64)p.g.ch << ppaf->ch_offset;
		paddr |= (u64)p.g.lun << ppaf->lun_offset;
		paddr |= (u64)p.g.pg << ppaf->pg_offset;
		paddr |= (u64)p.g.pl << ppaf->pln_offset;
		paddr |= (u64)p.g.sec << ppaf->sec_offset;
	} else {
		struct pblk_addrf *uaddrf = &pblk->uaddrf;
		u64 secs = p.m.sec;
		int sec_stripe;

		paddr = (u64)p.m.grp * uaddrf->sec_stripe;
		paddr += (u64)p.m.pu * uaddrf->sec_lun_stripe;

		secs = div_u64_rem(secs, uaddrf->sec_stripe, &sec_stripe);
		paddr += secs * uaddrf->sec_ws_stripe;
		paddr += sec_stripe;
	}

	return paddr;
}

static inline struct ppa_addr pblk_ppa32_to_ppa64(struct pblk *pblk, u32 ppa32)
{
	struct nvm_tgt_dev *dev = pblk->dev;

	return nvm_ppa32_to_ppa64(dev->parent, &pblk->addrf, ppa32);
}

static inline u32 pblk_ppa64_to_ppa32(struct pblk *pblk, struct ppa_addr ppa64)
{
	struct nvm_tgt_dev *dev = pblk->dev;

	return nvm_ppa64_to_ppa32(dev->parent, &pblk->addrf, ppa64);
}

static inline struct ppa_addr pblk_trans_map_get(struct pblk *pblk,
								sector_t lba)
{
	struct ppa_addr ppa;

	if (pblk->addrf_len < 32) {
		u32 *map = (u32 *)pblk->trans_map;

		ppa = pblk_ppa32_to_ppa64(pblk, map[lba]);
	} else {
		struct ppa_addr *map = (struct ppa_addr *)pblk->trans_map;

		ppa = map[lba];
	}

	return ppa;
}

static inline void pblk_trans_map_set(struct pblk *pblk, sector_t lba,
						struct ppa_addr ppa)
{
	if (pblk->addrf_len < 32) {
		u32 *map = (u32 *)pblk->trans_map;

		map[lba] = pblk_ppa64_to_ppa32(pblk, ppa);
	} else {
		u64 *map = (u64 *)pblk->trans_map;

		map[lba] = ppa.ppa;
	}
}

static inline int pblk_ppa_empty(struct ppa_addr ppa_addr)
{
	return (ppa_addr.ppa == ADDR_EMPTY);
}

static inline void pblk_ppa_set_empty(struct ppa_addr *ppa_addr)
{
	ppa_addr->ppa = ADDR_EMPTY;
}

static inline bool pblk_ppa_comp(struct ppa_addr lppa, struct ppa_addr rppa)
{
	return (lppa.ppa == rppa.ppa);
}

static inline int pblk_addr_in_cache(struct ppa_addr ppa)
{
	return (ppa.ppa != ADDR_EMPTY && ppa.c.is_cached);
}

static inline int pblk_addr_to_cacheline(struct ppa_addr ppa)
{
	return ppa.c.line;
}

static inline struct ppa_addr pblk_cacheline_to_addr(int addr)
{
	struct ppa_addr p;

	p.c.line = addr;
	p.c.is_cached = 1;

	return p;
}

static inline u32 pblk_calc_meta_header_crc(struct pblk *pblk,
					    struct line_header *header)
{
	u32 crc = ~(u32)0;

	crc = crc32_le(crc, (unsigned char *)header + sizeof(crc),
				sizeof(struct line_header) - sizeof(crc));

	return crc;
}

static inline u32 pblk_calc_smeta_crc(struct pblk *pblk,
				      struct line_smeta *smeta)
{
	struct pblk_line_meta *lm = &pblk->lm;
	u32 crc = ~(u32)0;

	crc = crc32_le(crc, (unsigned char *)smeta +
				sizeof(struct line_header) + sizeof(crc),
				lm->smeta_len -
				sizeof(struct line_header) - sizeof(crc));

	return crc;
}

static inline u32 pblk_calc_emeta_crc(struct pblk *pblk,
				      struct line_emeta *emeta)
{
	struct pblk_line_meta *lm = &pblk->lm;
	u32 crc = ~(u32)0;

	crc = crc32_le(crc, (unsigned char *)emeta +
				sizeof(struct line_header) + sizeof(crc),
				lm->emeta_len[0] -
				sizeof(struct line_header) - sizeof(crc));

	return crc;
}

static inline int pblk_io_aligned(struct pblk *pblk, int nr_secs)
{
	return !(nr_secs % pblk->min_write_pgs);
}

#ifdef CONFIG_NVM_PBLK_DEBUG
static inline void print_ppa(struct pblk *pblk, struct ppa_addr *p,
			     char *msg, int error)
{
	struct nvm_geo *geo = &pblk->dev->geo;

	if (p->c.is_cached) {
		pblk_err(pblk, "ppa: (%s: %x) cache line: %llu\n",
				msg, error, (u64)p->c.line);
	} else if (geo->version == NVM_OCSSD_SPEC_12) {
		pblk_err(pblk, "ppa: (%s: %x):ch:%d,lun:%d,blk:%d,pg:%d,pl:%d,sec:%d\n",
			msg, error,
			p->g.ch, p->g.lun, p->g.blk,
			p->g.pg, p->g.pl, p->g.sec);
	} else {
		pblk_err(pblk, "ppa: (%s: %x):ch:%d,lun:%d,chk:%d,sec:%d\n",
			msg, error,
			p->m.grp, p->m.pu, p->m.chk, p->m.sec);
	}
}

static inline void pblk_print_failed_rqd(struct pblk *pblk, struct nvm_rq *rqd,
					 int error)
{
	int bit = -1;

	if (rqd->nr_ppas ==  1) {
		print_ppa(pblk, &rqd->ppa_addr, "rqd", error);
		return;
	}

	while ((bit = find_next_bit((void *)&rqd->ppa_status, rqd->nr_ppas,
						bit + 1)) < rqd->nr_ppas) {
		print_ppa(pblk, &rqd->ppa_list[bit], "rqd", error);
	}

	pblk_err(pblk, "error:%d, ppa_status:%llx\n", error, rqd->ppa_status);
}

static inline int pblk_boundary_ppa_checks(struct nvm_tgt_dev *tgt_dev,
				       struct ppa_addr *ppas, int nr_ppas)
{
	struct nvm_geo *geo = &tgt_dev->geo;
	struct ppa_addr *ppa;
	int i;

	for (i = 0; i < nr_ppas; i++) {
		ppa = &ppas[i];

		if (geo->version == NVM_OCSSD_SPEC_12) {
			if (!ppa->c.is_cached &&
					ppa->g.ch < geo->num_ch &&
					ppa->g.lun < geo->num_lun &&
					ppa->g.pl < geo->num_pln &&
					ppa->g.blk < geo->num_chk &&
					ppa->g.pg < geo->num_pg &&
					ppa->g.sec < geo->ws_min)
				continue;
		} else {
			if (!ppa->c.is_cached &&
					ppa->m.grp < geo->num_ch &&
					ppa->m.pu < geo->num_lun &&
					ppa->m.chk < geo->num_chk &&
					ppa->m.sec < geo->clba)
				continue;
		}

		print_ppa(tgt_dev->q->queuedata, ppa, "boundary", i);

		return 1;
	}
	return 0;
}

static inline int pblk_check_io(struct pblk *pblk, struct nvm_rq *rqd)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);

	if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) {
		WARN_ON(1);
		return -EINVAL;
	}

	if (rqd->opcode == NVM_OP_PWRITE) {
		struct pblk_line *line;
		int i;

		for (i = 0; i < rqd->nr_ppas; i++) {
			line = pblk_ppa_to_line(pblk, ppa_list[i]);

			spin_lock(&line->lock);
			if (line->state != PBLK_LINESTATE_OPEN) {
				pblk_err(pblk, "bad ppa: line:%d,state:%d\n",
							line->id, line->state);
				WARN_ON(1);
				spin_unlock(&line->lock);
				return -EINVAL;
			}
			spin_unlock(&line->lock);
		}
	}

	return 0;
}
#endif

static inline int pblk_boundary_paddr_checks(struct pblk *pblk, u64 paddr)
{
	struct pblk_line_meta *lm = &pblk->lm;

	if (paddr > lm->sec_per_line)
		return 1;

	return 0;
}

static inline unsigned int pblk_get_bi_idx(struct bio *bio)
{
	return bio->bi_iter.bi_idx;
}

static inline sector_t pblk_get_lba(struct bio *bio)
{
	return bio->bi_iter.bi_sector / NR_PHY_IN_LOG;
}

static inline unsigned int pblk_get_secs(struct bio *bio)
{
	return  bio->bi_iter.bi_size / PBLK_EXPOSED_PAGE_SIZE;
}

static inline char *pblk_disk_name(struct pblk *pblk)
{
	struct gendisk *disk = pblk->disk;

	return disk->disk_name;
}

static inline unsigned int pblk_get_min_chks(struct pblk *pblk)
{
	struct pblk_line_meta *lm = &pblk->lm;
	/* In a worst-case scenario every line will have OP invalid sectors.
	 * We will then need a minimum of 1/OP lines to free up a single line
	 */

	return DIV_ROUND_UP(100, pblk->op) * lm->blk_per_line;
}

static inline struct pblk_sec_meta *pblk_get_meta(struct pblk *pblk,
							 void *meta, int index)
{
	return meta +
	       max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size)
	       * index;
}

static inline int pblk_dma_meta_size(struct pblk *pblk)
{
	return max_t(int, sizeof(struct pblk_sec_meta), pblk->oob_meta_size)
	       * NVM_MAX_VLBA;
}

static inline int pblk_is_oob_meta_supported(struct pblk *pblk)
{
	return pblk->oob_meta_size >= sizeof(struct pblk_sec_meta);
}
#endif /* PBLK_H_ */