include/linux/lightnvm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef NVM_H
   3 #define NVM_H
   4
   5 #include <linux/blkdev.h>
   6 #include <linux/types.h>
   7 #include <uapi/linux/lightnvm.h>
   8
   9 enum {
  10         NVM_IO_OK = 0,
  11         NVM_IO_REQUEUE = 1,
  12         NVM_IO_DONE = 2,
  13         NVM_IO_ERR = 3,
  14
  15         NVM_IOTYPE_NONE = 0,
  16         NVM_IOTYPE_GC = 1,
  17 };
  18
  19 /* common format */
  20 #define NVM_GEN_CH_BITS  (8)
  21 #define NVM_GEN_LUN_BITS (8)
  22 #define NVM_GEN_BLK_BITS (16)
  23 #define NVM_GEN_RESERVED (32)
  24
  25 /* 1.2 format */
  26 #define NVM_12_PG_BITS  (16)
  27 #define NVM_12_PL_BITS  (4)
  28 #define NVM_12_SEC_BITS (4)
  29 #define NVM_12_RESERVED (8)
  30
  31 /* 2.0 format */
  32 #define NVM_20_SEC_BITS (24)
  33 #define NVM_20_RESERVED (8)
  34
  35 enum {
  36         NVM_OCSSD_SPEC_12 = 12,
  37         NVM_OCSSD_SPEC_20 = 20,
  38 };
  39
  40 struct ppa_addr {
  41         /* Generic structure for all addresses */
  42         union {
  43                 /* generic device format */
  44                 struct {
  45                         u64 ch          : NVM_GEN_CH_BITS;
  46                         u64 lun         : NVM_GEN_LUN_BITS;
  47                         u64 blk         : NVM_GEN_BLK_BITS;
  48                         u64 reserved    : NVM_GEN_RESERVED;
  49                 } a;
  50
  51                 /* 1.2 device format */
  52                 struct {
  53                         u64 ch          : NVM_GEN_CH_BITS;
  54                         u64 lun         : NVM_GEN_LUN_BITS;
  55                         u64 blk         : NVM_GEN_BLK_BITS;
  56                         u64 pg          : NVM_12_PG_BITS;
  57                         u64 pl          : NVM_12_PL_BITS;
  58                         u64 sec         : NVM_12_SEC_BITS;
  59                         u64 reserved    : NVM_12_RESERVED;
  60                 } g;
  61
  62                 /* 2.0 device format */
  63                 struct {
  64                         u64 grp         : NVM_GEN_CH_BITS;
  65                         u64 pu          : NVM_GEN_LUN_BITS;
  66                         u64 chk         : NVM_GEN_BLK_BITS;
  67                         u64 sec         : NVM_20_SEC_BITS;
  68                         u64 reserved    : NVM_20_RESERVED;
  69                 } m;
  70
  71                 struct {
  72                         u64 line        : 63;
  73                         u64 is_cached   : 1;
  74                 } c;
  75
  76                 u64 ppa;
  77         };
  78 };
  79
  80 struct nvm_rq;
  81 struct nvm_id;
  82 struct nvm_dev;
  83 struct nvm_tgt_dev;
  84 struct nvm_chk_meta;
  85
  86 typedef int (nvm_id_fn)(struct nvm_dev *);
  87 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
  88 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
  89 typedef int (nvm_get_chk_meta_fn)(struct nvm_dev *, sector_t, int,
  90                                                         struct nvm_chk_meta *);
  91 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *, void *);
  92 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *, int);
  93 typedef void (nvm_destroy_dma_pool_fn)(void *);
  94 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
  95                                                                 dma_addr_t *);
  96 typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
  97
  98 struct nvm_dev_ops {
  99         nvm_id_fn               *identity;
 100         nvm_op_bb_tbl_fn        *get_bb_tbl;
 101         nvm_op_set_bb_fn        *set_bb_tbl;
 102
 103         nvm_get_chk_meta_fn     *get_chk_meta;
 104
 105         nvm_submit_io_fn        *submit_io;
 106
 107         nvm_create_dma_pool_fn  *create_dma_pool;
 108         nvm_destroy_dma_pool_fn *destroy_dma_pool;
 109         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
 110         nvm_dev_dma_free_fn     *dev_dma_free;
 111 };
 112
 113 #ifdef CONFIG_NVM
 114
 115 #include <linux/blkdev.h>
 116 #include <linux/file.h>
 117 #include <linux/dmapool.h>
 118 #include <uapi/linux/lightnvm.h>
 119
 120 enum {
 121         /* HW Responsibilities */
 122         NVM_RSP_L2P     = 1 << 0,
 123         NVM_RSP_ECC     = 1 << 1,
 124
 125         /* Physical Adressing Mode */
 126         NVM_ADDRMODE_LINEAR     = 0,
 127         NVM_ADDRMODE_CHANNEL    = 1,
 128
 129         /* Plane programming mode for LUN */
 130         NVM_PLANE_SINGLE        = 1,
 131         NVM_PLANE_DOUBLE        = 2,
 132         NVM_PLANE_QUAD          = 4,
 133
 134         /* Status codes */
 135         NVM_RSP_SUCCESS         = 0x0,
 136         NVM_RSP_NOT_CHANGEABLE  = 0x1,
 137         NVM_RSP_ERR_FAILWRITE   = 0x40ff,
 138         NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
 139         NVM_RSP_ERR_FAILECC     = 0x4281,
 140         NVM_RSP_ERR_FAILCRC     = 0x4004,
 141         NVM_RSP_WARN_HIGHECC    = 0x4700,
 142
 143         /* Device opcodes */
 144         NVM_OP_PWRITE           = 0x91,
 145         NVM_OP_PREAD            = 0x92,
 146         NVM_OP_ERASE            = 0x90,
 147
 148         /* PPA Command Flags */
 149         NVM_IO_SNGL_ACCESS      = 0x0,
 150         NVM_IO_DUAL_ACCESS      = 0x1,
 151         NVM_IO_QUAD_ACCESS      = 0x2,
 152
 153         /* NAND Access Modes */
 154         NVM_IO_SUSPEND          = 0x80,
 155         NVM_IO_SLC_MODE         = 0x100,
 156         NVM_IO_SCRAMBLE_ENABLE  = 0x200,
 157
 158         /* Block Types */
 159         NVM_BLK_T_FREE          = 0x0,
 160         NVM_BLK_T_BAD           = 0x1,
 161         NVM_BLK_T_GRWN_BAD      = 0x2,
 162         NVM_BLK_T_DEV           = 0x4,
 163         NVM_BLK_T_HOST          = 0x8,
 164
 165         /* Memory capabilities */
 166         NVM_ID_CAP_SLC          = 0x1,
 167         NVM_ID_CAP_CMD_SUSPEND  = 0x2,
 168         NVM_ID_CAP_SCRAMBLE     = 0x4,
 169         NVM_ID_CAP_ENCRYPT      = 0x8,
 170
 171         /* Memory types */
 172         NVM_ID_FMTYPE_SLC       = 0,
 173         NVM_ID_FMTYPE_MLC       = 1,
 174
 175         /* Device capabilities */
 176         NVM_ID_DCAP_BBLKMGMT    = 0x1,
 177         NVM_UD_DCAP_ECC         = 0x2,
 178 };
 179
 180 struct nvm_id_lp_mlc {
 181         u16     num_pairs;
 182         u8      pairs[886];
 183 };
 184
 185 struct nvm_id_lp_tbl {
 186         __u8    id[8];
 187         struct nvm_id_lp_mlc mlc;
 188 };
 189
 190 struct nvm_addrf_12 {
 191         u8      ch_len;
 192         u8      lun_len;
 193         u8      blk_len;
 194         u8      pg_len;
 195         u8      pln_len;
 196         u8      sec_len;
 197
 198         u8      ch_offset;
 199         u8      lun_offset;
 200         u8      blk_offset;
 201         u8      pg_offset;
 202         u8      pln_offset;
 203         u8      sec_offset;
 204
 205         u64     ch_mask;
 206         u64     lun_mask;
 207         u64     blk_mask;
 208         u64     pg_mask;
 209         u64     pln_mask;
 210         u64     sec_mask;
 211 };
 212
 213 struct nvm_addrf {
 214         u8      ch_len;
 215         u8      lun_len;
 216         u8      chk_len;
 217         u8      sec_len;
 218         u8      rsv_len[2];
 219
 220         u8      ch_offset;
 221         u8      lun_offset;
 222         u8      chk_offset;
 223         u8      sec_offset;
 224         u8      rsv_off[2];
 225
 226         u64     ch_mask;
 227         u64     lun_mask;
 228         u64     chk_mask;
 229         u64     sec_mask;
 230         u64     rsv_mask[2];
 231 };
 232
 233 enum {
 234         /* Chunk states */
 235         NVM_CHK_ST_FREE =       1 << 0,
 236         NVM_CHK_ST_CLOSED =     1 << 1,
 237         NVM_CHK_ST_OPEN =       1 << 2,
 238         NVM_CHK_ST_OFFLINE =    1 << 3,
 239
 240         /* Chunk types */
 241         NVM_CHK_TP_W_SEQ =      1 << 0,
 242         NVM_CHK_TP_W_RAN =      1 << 1,
 243         NVM_CHK_TP_SZ_SPEC =    1 << 4,
 244 };
 245
 246 /*
 247  * Note: The structure size is linked to nvme_nvm_chk_meta such that the same
 248  * buffer can be used when converting from little endian to cpu addressing.
 249  */
 250 struct nvm_chk_meta {
 251         u8      state;
 252         u8      type;
 253         u8      wi;
 254         u8      rsvd[5];
 255         u64     slba;
 256         u64     cnlb;
 257         u64     wp;
 258 };
 259
 260 struct nvm_target {
 261         struct list_head list;
 262         struct nvm_tgt_dev *dev;
 263         struct nvm_tgt_type *type;
 264         struct gendisk *disk;
 265 };
 266
 267 #define ADDR_EMPTY (~0ULL)
 268
 269 #define NVM_TARGET_DEFAULT_OP (101)
 270 #define NVM_TARGET_MIN_OP (3)
 271 #define NVM_TARGET_MAX_OP (80)
 272
 273 #define NVM_VERSION_MAJOR 1
 274 #define NVM_VERSION_MINOR 0
 275 #define NVM_VERSION_PATCH 0
 276
 277 #define NVM_MAX_VLBA (64) /* max logical blocks in a vector command */
 278
 279 struct nvm_rq;
 280 typedef void (nvm_end_io_fn)(struct nvm_rq *);
 281
 282 struct nvm_rq {
 283         struct nvm_tgt_dev *dev;
 284
 285         struct bio *bio;
 286
 287         union {
 288                 struct ppa_addr ppa_addr;
 289                 dma_addr_t dma_ppa_list;
 290         };
 291
 292         struct ppa_addr *ppa_list;
 293
 294         void *meta_list;
 295         dma_addr_t dma_meta_list;
 296
 297         nvm_end_io_fn *end_io;
 298
 299         uint8_t opcode;
 300         uint16_t nr_ppas;
 301         uint16_t flags;
 302
 303         u64 ppa_status; /* ppa media status */
 304         int error;
 305
 306         int is_seq; /* Sequential hint flag. 1.2 only */
 307
 308         void *private;
 309 };
 310
 311 static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
 312 {
 313         return pdu - sizeof(struct nvm_rq);
 314 }
 315
 316 static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
 317 {
 318         return rqdata + 1;
 319 }
 320
 321 static inline struct ppa_addr *nvm_rq_to_ppa_list(struct nvm_rq *rqd)
 322 {
 323         return (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr;
 324 }
 325
 326 enum {
 327         NVM_BLK_ST_FREE =       0x1,    /* Free block */
 328         NVM_BLK_ST_TGT =        0x2,    /* Block in use by target */
 329         NVM_BLK_ST_BAD =        0x8,    /* Bad block */
 330 };
 331
 332 /* Instance geometry */
 333 struct nvm_geo {
 334         /* device reported version */
 335         u8      major_ver_id;
 336         u8      minor_ver_id;
 337
 338         /* kernel short version */
 339         u8      version;
 340
 341         /* instance specific geometry */
 342         int num_ch;
 343         int num_lun;            /* per channel */
 344
 345         /* calculated values */
 346         int all_luns;           /* across channels */
 347         int all_chunks;         /* across channels */
 348
 349         int op;                 /* over-provision in instance */
 350
 351         sector_t total_secs;    /* across channels */
 352
 353         /* chunk geometry */
 354         u32     num_chk;        /* chunks per lun */
 355         u32     clba;           /* sectors per chunk */
 356         u16     csecs;          /* sector size */
 357         u16     sos;            /* out-of-band area size */
 358         bool    ext;            /* metadata in extended data buffer */
 359         u32     mdts;           /* Max data transfer size*/
 360
 361         /* device write constrains */
 362         u32     ws_min;         /* minimum write size */
 363         u32     ws_opt;         /* optimal write size */
 364         u32     mw_cunits;      /* distance required for successful read */
 365         u32     maxoc;          /* maximum open chunks */
 366         u32     maxocpu;        /* maximum open chunks per parallel unit */
 367
 368         /* device capabilities */
 369         u32     mccap;
 370
 371         /* device timings */
 372         u32     trdt;           /* Avg. Tread (ns) */
 373         u32     trdm;           /* Max Tread (ns) */
 374         u32     tprt;           /* Avg. Tprog (ns) */
 375         u32     tprm;           /* Max Tprog (ns) */
 376         u32     tbet;           /* Avg. Terase (ns) */
 377         u32     tbem;           /* Max Terase (ns) */
 378
 379         /* generic address format */
 380         struct nvm_addrf addrf;
 381
 382         /* 1.2 compatibility */
 383         u8      vmnt;
 384         u32     cap;
 385         u32     dom;
 386
 387         u8      mtype;
 388         u8      fmtype;
 389
 390         u16     cpar;
 391         u32     mpos;
 392
 393         u8      num_pln;
 394         u8      pln_mode;
 395         u16     num_pg;
 396         u16     fpg_sz;
 397 };
 398
 399 /* sub-device structure */
 400 struct nvm_tgt_dev {
 401         /* Device information */
 402         struct nvm_geo geo;
 403
 404         /* Base ppas for target LUNs */
 405         struct ppa_addr *luns;
 406
 407         struct request_queue *q;
 408
 409         struct nvm_dev *parent;
 410         void *map;
 411 };
 412
 413 struct nvm_dev {
 414         struct nvm_dev_ops *ops;
 415
 416         struct list_head devices;
 417
 418         /* Device information */
 419         struct nvm_geo geo;
 420
 421         unsigned long *lun_map;
 422         void *dma_pool;
 423
 424         /* Backend device */
 425         struct request_queue *q;
 426         char name[DISK_NAME_LEN];
 427         void *private_data;
 428
 429         struct kref ref;
 430         void *rmap;
 431
 432         struct mutex mlock;
 433         spinlock_t lock;
 434
 435         /* target management */
 436         struct list_head area_list;
 437         struct list_head targets;
 438 };
 439
 440 static inline struct ppa_addr generic_to_dev_addr(struct nvm_dev *dev,
 441                                                   struct ppa_addr r)
 442 {
 443         struct nvm_geo *geo = &dev->geo;
 444         struct ppa_addr l;
 445
 446         if (geo->version == NVM_OCSSD_SPEC_12) {
 447                 struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&geo->addrf;
 448
 449                 l.ppa = ((u64)r.g.ch) << ppaf->ch_offset;
 450                 l.ppa |= ((u64)r.g.lun) << ppaf->lun_offset;
 451                 l.ppa |= ((u64)r.g.blk) << ppaf->blk_offset;
 452                 l.ppa |= ((u64)r.g.pg) << ppaf->pg_offset;
 453                 l.ppa |= ((u64)r.g.pl) << ppaf->pln_offset;
 454                 l.ppa |= ((u64)r.g.sec) << ppaf->sec_offset;
 455         } else {
 456                 struct nvm_addrf *lbaf = &geo->addrf;
 457
 458                 l.ppa = ((u64)r.m.grp) << lbaf->ch_offset;
 459                 l.ppa |= ((u64)r.m.pu) << lbaf->lun_offset;
 460                 l.ppa |= ((u64)r.m.chk) << lbaf->chk_offset;
 461                 l.ppa |= ((u64)r.m.sec) << lbaf->sec_offset;
 462         }
 463
 464         return l;
 465 }
 466
 467 static inline struct ppa_addr dev_to_generic_addr(struct nvm_dev *dev,
 468                                                   struct ppa_addr r)
 469 {
 470         struct nvm_geo *geo = &dev->geo;
 471         struct ppa_addr l;
 472
 473         l.ppa = 0;
 474
 475         if (geo->version == NVM_OCSSD_SPEC_12) {
 476                 struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)&geo->addrf;
 477
 478                 l.g.ch = (r.ppa & ppaf->ch_mask) >> ppaf->ch_offset;
 479                 l.g.lun = (r.ppa & ppaf->lun_mask) >> ppaf->lun_offset;
 480                 l.g.blk = (r.ppa & ppaf->blk_mask) >> ppaf->blk_offset;
 481                 l.g.pg = (r.ppa & ppaf->pg_mask) >> ppaf->pg_offset;
 482                 l.g.pl = (r.ppa & ppaf->pln_mask) >> ppaf->pln_offset;
 483                 l.g.sec = (r.ppa & ppaf->sec_mask) >> ppaf->sec_offset;
 484         } else {
 485                 struct nvm_addrf *lbaf = &geo->addrf;
 486
 487                 l.m.grp = (r.ppa & lbaf->ch_mask) >> lbaf->ch_offset;
 488                 l.m.pu = (r.ppa & lbaf->lun_mask) >> lbaf->lun_offset;
 489                 l.m.chk = (r.ppa & lbaf->chk_mask) >> lbaf->chk_offset;
 490                 l.m.sec = (r.ppa & lbaf->sec_mask) >> lbaf->sec_offset;
 491         }
 492
 493         return l;
 494 }
 495
 496 static inline u64 dev_to_chunk_addr(struct nvm_dev *dev, void *addrf,
 497                                     struct ppa_addr p)
 498 {
 499         struct nvm_geo *geo = &dev->geo;
 500         u64 caddr;
 501
 502         if (geo->version == NVM_OCSSD_SPEC_12) {
 503                 struct nvm_addrf_12 *ppaf = (struct nvm_addrf_12 *)addrf;
 504
 505                 caddr = (u64)p.g.pg << ppaf->pg_offset;
 506                 caddr |= (u64)p.g.pl << ppaf->pln_offset;
 507                 caddr |= (u64)p.g.sec << ppaf->sec_offset;
 508         } else {
 509                 caddr = p.m.sec;
 510         }
 511
 512         return caddr;
 513 }
 514
 515 static inline struct ppa_addr nvm_ppa32_to_ppa64(struct nvm_dev *dev,
 516                                                  void *addrf, u32 ppa32)
 517 {
 518         struct ppa_addr ppa64;
 519
 520         ppa64.ppa = 0;
 521
 522         if (ppa32 == -1) {
 523                 ppa64.ppa = ADDR_EMPTY;
 524         } else if (ppa32 & (1U << 31)) {
 525                 ppa64.c.line = ppa32 & ((~0U) >> 1);
 526                 ppa64.c.is_cached = 1;
 527         } else {
 528                 struct nvm_geo *geo = &dev->geo;
 529
 530                 if (geo->version == NVM_OCSSD_SPEC_12) {
 531                         struct nvm_addrf_12 *ppaf = addrf;
 532
 533                         ppa64.g.ch = (ppa32 & ppaf->ch_mask) >>
 534                                                         ppaf->ch_offset;
 535                         ppa64.g.lun = (ppa32 & ppaf->lun_mask) >>
 536                                                         ppaf->lun_offset;
 537                         ppa64.g.blk = (ppa32 & ppaf->blk_mask) >>
 538                                                         ppaf->blk_offset;
 539                         ppa64.g.pg = (ppa32 & ppaf->pg_mask) >>
 540                                                         ppaf->pg_offset;
 541                         ppa64.g.pl = (ppa32 & ppaf->pln_mask) >>
 542                                                         ppaf->pln_offset;
 543                         ppa64.g.sec = (ppa32 & ppaf->sec_mask) >>
 544                                                         ppaf->sec_offset;
 545                 } else {
 546                         struct nvm_addrf *lbaf = addrf;
 547
 548                         ppa64.m.grp = (ppa32 & lbaf->ch_mask) >>
 549                                                         lbaf->ch_offset;
 550                         ppa64.m.pu = (ppa32 & lbaf->lun_mask) >>
 551                                                         lbaf->lun_offset;
 552                         ppa64.m.chk = (ppa32 & lbaf->chk_mask) >>
 553                                                         lbaf->chk_offset;
 554                         ppa64.m.sec = (ppa32 & lbaf->sec_mask) >>
 555                                                         lbaf->sec_offset;
 556                 }
 557         }
 558
 559         return ppa64;
 560 }
 561
 562 static inline u32 nvm_ppa64_to_ppa32(struct nvm_dev *dev,
 563                                      void *addrf, struct ppa_addr ppa64)
 564 {
 565         u32 ppa32 = 0;
 566
 567         if (ppa64.ppa == ADDR_EMPTY) {
 568                 ppa32 = ~0U;
 569         } else if (ppa64.c.is_cached) {
 570                 ppa32 |= ppa64.c.line;
 571                 ppa32 |= 1U << 31;
 572         } else {
 573                 struct nvm_geo *geo = &dev->geo;
 574
 575                 if (geo->version == NVM_OCSSD_SPEC_12) {
 576                         struct nvm_addrf_12 *ppaf = addrf;
 577
 578                         ppa32 |= ppa64.g.ch << ppaf->ch_offset;
 579                         ppa32 |= ppa64.g.lun << ppaf->lun_offset;
 580                         ppa32 |= ppa64.g.blk << ppaf->blk_offset;
 581                         ppa32 |= ppa64.g.pg << ppaf->pg_offset;
 582                         ppa32 |= ppa64.g.pl << ppaf->pln_offset;
 583                         ppa32 |= ppa64.g.sec << ppaf->sec_offset;
 584                 } else {
 585                         struct nvm_addrf *lbaf = addrf;
 586
 587                         ppa32 |= ppa64.m.grp << lbaf->ch_offset;
 588                         ppa32 |= ppa64.m.pu << lbaf->lun_offset;
 589                         ppa32 |= ppa64.m.chk << lbaf->chk_offset;
 590                         ppa32 |= ppa64.m.sec << lbaf->sec_offset;
 591                 }
 592         }
 593
 594         return ppa32;
 595 }
 596
 597 static inline int nvm_next_ppa_in_chk(struct nvm_tgt_dev *dev,
 598                                       struct ppa_addr *ppa)
 599 {
 600         struct nvm_geo *geo = &dev->geo;
 601         int last = 0;
 602
 603         if (geo->version == NVM_OCSSD_SPEC_12) {
 604                 int sec = ppa->g.sec;
 605
 606                 sec++;
 607                 if (sec == geo->ws_min) {
 608                         int pg = ppa->g.pg;
 609
 610                         sec = 0;
 611                         pg++;
 612                         if (pg == geo->num_pg) {
 613                                 int pl = ppa->g.pl;
 614
 615                                 pg = 0;
 616                                 pl++;
 617                                 if (pl == geo->num_pln)
 618                                         last = 1;
 619
 620                                 ppa->g.pl = pl;
 621                         }
 622                         ppa->g.pg = pg;
 623                 }
 624                 ppa->g.sec = sec;
 625         } else {
 626                 ppa->m.sec++;
 627                 if (ppa->m.sec == geo->clba)
 628                         last = 1;
 629         }
 630
 631         return last;
 632 }
 633
 634 typedef sector_t (nvm_tgt_capacity_fn)(void *);
 635 typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *,
 636                                 int flags);
 637 typedef void (nvm_tgt_exit_fn)(void *, bool);
 638 typedef int (nvm_tgt_sysfs_init_fn)(struct gendisk *);
 639 typedef void (nvm_tgt_sysfs_exit_fn)(struct gendisk *);
 640
 641 enum {
 642         NVM_TGT_F_DEV_L2P = 0,
 643         NVM_TGT_F_HOST_L2P = 1 << 0,
 644 };
 645
 646 struct nvm_tgt_type {
 647         const char *name;
 648         unsigned int version[3];
 649         int flags;
 650
 651         /* target entry points */
 652         const struct block_device_operations *bops;
 653         nvm_tgt_capacity_fn *capacity;
 654
 655         /* module-specific init/teardown */
 656         nvm_tgt_init_fn *init;
 657         nvm_tgt_exit_fn *exit;
 658
 659         /* sysfs */
 660         nvm_tgt_sysfs_init_fn *sysfs_init;
 661         nvm_tgt_sysfs_exit_fn *sysfs_exit;
 662
 663         /* For internal use */
 664         struct list_head list;
 665         struct module *owner;
 666 };
 667
 668 extern int nvm_register_tgt_type(struct nvm_tgt_type *);
 669 extern void nvm_unregister_tgt_type(struct nvm_tgt_type *);
 670
 671 extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
 672 extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
 673
 674 extern struct nvm_dev *nvm_alloc_dev(int);
 675 extern int nvm_register(struct nvm_dev *);
 676 extern void nvm_unregister(struct nvm_dev *);
 677
 678 extern int nvm_get_chunk_meta(struct nvm_tgt_dev *, struct ppa_addr,
 679                               int, struct nvm_chk_meta *);
 680 extern int nvm_set_chunk_meta(struct nvm_tgt_dev *, struct ppa_addr *,
 681                               int, int);
 682 extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *, void *);
 683 extern int nvm_submit_io_sync(struct nvm_tgt_dev *, struct nvm_rq *, void *);
 684 extern void nvm_end_io(struct nvm_rq *);
 685
 686 #else /* CONFIG_NVM */
 687 struct nvm_dev_ops;
 688
 689 static inline struct nvm_dev *nvm_alloc_dev(int node)
 690 {
 691         return ERR_PTR(-EINVAL);
 692 }
 693 static inline int nvm_register(struct nvm_dev *dev)
 694 {
 695         return -EINVAL;
 696 }
 697 static inline void nvm_unregister(struct nvm_dev *dev) {}
 698 #endif /* CONFIG_NVM */
 699 #endif /* LIGHTNVM.H */