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