include/linux/lightnvm.h

   1 #ifndef NVM_H
   2 #define NVM_H
   3
   4 #include <linux/types.h>
   5
   6 enum {
   7         NVM_IO_OK = 0,
   8         NVM_IO_REQUEUE = 1,
   9         NVM_IO_DONE = 2,
  10         NVM_IO_ERR = 3,
  11
  12         NVM_IOTYPE_NONE = 0,
  13         NVM_IOTYPE_GC = 1,
  14 };
  15
  16 #define NVM_BLK_BITS (16)
  17 #define NVM_PG_BITS  (16)
  18 #define NVM_SEC_BITS (8)
  19 #define NVM_PL_BITS  (8)
  20 #define NVM_LUN_BITS (8)
  21 #define NVM_CH_BITS  (7)
  22
  23 struct ppa_addr {
  24         /* Generic structure for all addresses */
  25         union {
  26                 struct {
  27                         u64 blk         : NVM_BLK_BITS;
  28                         u64 pg          : NVM_PG_BITS;
  29                         u64 sec         : NVM_SEC_BITS;
  30                         u64 pl          : NVM_PL_BITS;
  31                         u64 lun         : NVM_LUN_BITS;
  32                         u64 ch          : NVM_CH_BITS;
  33                         u64 reserved    : 1;
  34                 } g;
  35
  36                 struct {
  37                         u64 line        : 63;
  38                         u64 is_cached   : 1;
  39                 } c;
  40
  41                 u64 ppa;
  42         };
  43 };
  44
  45 struct nvm_rq;
  46 struct nvm_id;
  47 struct nvm_dev;
  48
  49 typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
  50 typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
  51 typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
  52                                 nvm_l2p_update_fn *, void *);
  53 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
  54 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
  55 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
  56 typedef int (nvm_erase_blk_fn)(struct nvm_dev *, struct nvm_rq *);
  57 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
  58 typedef void (nvm_destroy_dma_pool_fn)(void *);
  59 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
  60                                                                 dma_addr_t *);
  61 typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
  62
  63 struct nvm_dev_ops {
  64         nvm_id_fn               *identity;
  65         nvm_get_l2p_tbl_fn      *get_l2p_tbl;
  66         nvm_op_bb_tbl_fn        *get_bb_tbl;
  67         nvm_op_set_bb_fn        *set_bb_tbl;
  68
  69         nvm_submit_io_fn        *submit_io;
  70         nvm_erase_blk_fn        *erase_block;
  71
  72         nvm_create_dma_pool_fn  *create_dma_pool;
  73         nvm_destroy_dma_pool_fn *destroy_dma_pool;
  74         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
  75         nvm_dev_dma_free_fn     *dev_dma_free;
  76
  77         unsigned int            max_phys_sect;
  78 };
  79
  80
  81
  82 #ifdef CONFIG_NVM
  83
  84 #include <linux/blkdev.h>
  85 #include <linux/file.h>
  86 #include <linux/dmapool.h>
  87 #include <uapi/linux/lightnvm.h>
  88
  89 enum {
  90         /* HW Responsibilities */
  91         NVM_RSP_L2P     = 1 << 0,
  92         NVM_RSP_ECC     = 1 << 1,
  93
  94         /* Physical Adressing Mode */
  95         NVM_ADDRMODE_LINEAR     = 0,
  96         NVM_ADDRMODE_CHANNEL    = 1,
  97
  98         /* Plane programming mode for LUN */
  99         NVM_PLANE_SINGLE        = 1,
 100         NVM_PLANE_DOUBLE        = 2,
 101         NVM_PLANE_QUAD          = 4,
 102
 103         /* Status codes */
 104         NVM_RSP_SUCCESS         = 0x0,
 105         NVM_RSP_NOT_CHANGEABLE  = 0x1,
 106         NVM_RSP_ERR_FAILWRITE   = 0x40ff,
 107         NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
 108
 109         /* Device opcodes */
 110         NVM_OP_HBREAD           = 0x02,
 111         NVM_OP_HBWRITE          = 0x81,
 112         NVM_OP_PWRITE           = 0x91,
 113         NVM_OP_PREAD            = 0x92,
 114         NVM_OP_ERASE            = 0x90,
 115
 116         /* PPA Command Flags */
 117         NVM_IO_SNGL_ACCESS      = 0x0,
 118         NVM_IO_DUAL_ACCESS      = 0x1,
 119         NVM_IO_QUAD_ACCESS      = 0x2,
 120
 121         /* NAND Access Modes */
 122         NVM_IO_SUSPEND          = 0x80,
 123         NVM_IO_SLC_MODE         = 0x100,
 124         NVM_IO_SCRAMBLE_DISABLE = 0x200,
 125
 126         /* Block Types */
 127         NVM_BLK_T_FREE          = 0x0,
 128         NVM_BLK_T_BAD           = 0x1,
 129         NVM_BLK_T_GRWN_BAD      = 0x2,
 130         NVM_BLK_T_DEV           = 0x4,
 131         NVM_BLK_T_HOST          = 0x8,
 132
 133         /* Memory capabilities */
 134         NVM_ID_CAP_SLC          = 0x1,
 135         NVM_ID_CAP_CMD_SUSPEND  = 0x2,
 136         NVM_ID_CAP_SCRAMBLE     = 0x4,
 137         NVM_ID_CAP_ENCRYPT      = 0x8,
 138
 139         /* Memory types */
 140         NVM_ID_FMTYPE_SLC       = 0,
 141         NVM_ID_FMTYPE_MLC       = 1,
 142
 143         /* Device capabilities */
 144         NVM_ID_DCAP_BBLKMGMT    = 0x1,
 145         NVM_UD_DCAP_ECC         = 0x2,
 146 };
 147
 148 struct nvm_id_lp_mlc {
 149         u16     num_pairs;
 150         u8      pairs[886];
 151 };
 152
 153 struct nvm_id_lp_tbl {
 154         __u8    id[8];
 155         struct nvm_id_lp_mlc mlc;
 156 };
 157
 158 struct nvm_id_group {
 159         u8      mtype;
 160         u8      fmtype;
 161         u8      num_ch;
 162         u8      num_lun;
 163         u8      num_pln;
 164         u16     num_blk;
 165         u16     num_pg;
 166         u16     fpg_sz;
 167         u16     csecs;
 168         u16     sos;
 169         u32     trdt;
 170         u32     trdm;
 171         u32     tprt;
 172         u32     tprm;
 173         u32     tbet;
 174         u32     tbem;
 175         u32     mpos;
 176         u32     mccap;
 177         u16     cpar;
 178
 179         struct nvm_id_lp_tbl lptbl;
 180 };
 181
 182 struct nvm_addr_format {
 183         u8      ch_offset;
 184         u8      ch_len;
 185         u8      lun_offset;
 186         u8      lun_len;
 187         u8      pln_offset;
 188         u8      pln_len;
 189         u8      blk_offset;
 190         u8      blk_len;
 191         u8      pg_offset;
 192         u8      pg_len;
 193         u8      sect_offset;
 194         u8      sect_len;
 195 };
 196
 197 struct nvm_id {
 198         u8      ver_id;
 199         u8      vmnt;
 200         u8      cgrps;
 201         u32     cap;
 202         u32     dom;
 203         struct nvm_addr_format ppaf;
 204         struct nvm_id_group groups[4];
 205 } __packed;
 206
 207 struct nvm_target {
 208         struct list_head list;
 209         struct nvm_dev *dev;
 210         struct nvm_tgt_type *type;
 211         struct gendisk *disk;
 212 };
 213
 214 struct nvm_tgt_instance {
 215         struct nvm_tgt_type *tt;
 216 };
 217
 218 #define ADDR_EMPTY (~0ULL)
 219
 220 #define NVM_VERSION_MAJOR 1
 221 #define NVM_VERSION_MINOR 0
 222 #define NVM_VERSION_PATCH 0
 223
 224 struct nvm_rq;
 225 typedef void (nvm_end_io_fn)(struct nvm_rq *);
 226
 227 struct nvm_rq {
 228         struct nvm_tgt_instance *ins;
 229         struct nvm_dev *dev;
 230
 231         struct bio *bio;
 232
 233         union {
 234                 struct ppa_addr ppa_addr;
 235                 dma_addr_t dma_ppa_list;
 236         };
 237
 238         struct ppa_addr *ppa_list;
 239
 240         void *meta_list;
 241         dma_addr_t dma_meta_list;
 242
 243         struct completion *wait;
 244         nvm_end_io_fn *end_io;
 245
 246         uint8_t opcode;
 247         uint16_t nr_ppas;
 248         uint16_t flags;
 249
 250         u64 ppa_status; /* ppa media status */
 251         int error;
 252 };
 253
 254 static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
 255 {
 256         return pdu - sizeof(struct nvm_rq);
 257 }
 258
 259 static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
 260 {
 261         return rqdata + 1;
 262 }
 263
 264 struct nvm_block;
 265
 266 struct nvm_lun {
 267         int id;
 268
 269         int lun_id;
 270         int chnl_id;
 271
 272         /* It is up to the target to mark blocks as closed. If the target does
 273          * not do it, all blocks are marked as open, and nr_open_blocks
 274          * represents the number of blocks in use
 275          */
 276         unsigned int nr_open_blocks;    /* Number of used, writable blocks */
 277         unsigned int nr_closed_blocks;  /* Number of used, read-only blocks */
 278         unsigned int nr_free_blocks;    /* Number of unused blocks */
 279         unsigned int nr_bad_blocks;     /* Number of bad blocks */
 280
 281         spinlock_t lock;
 282
 283         struct nvm_block *blocks;
 284 };
 285
 286 enum {
 287         NVM_BLK_ST_FREE =       0x1,    /* Free block */
 288         NVM_BLK_ST_OPEN =       0x2,    /* Open block - read-write */
 289         NVM_BLK_ST_CLOSED =     0x4,    /* Closed block - read-only */
 290         NVM_BLK_ST_BAD =        0x8,    /* Bad block */
 291 };
 292
 293 struct nvm_block {
 294         struct list_head list;
 295         struct nvm_lun *lun;
 296         unsigned long id;
 297
 298         void *priv;
 299         int state;
 300 };
 301
 302 /* system block cpu representation */
 303 struct nvm_sb_info {
 304         unsigned long           seqnr;
 305         unsigned long           erase_cnt;
 306         unsigned int            version;
 307         char                    mmtype[NVM_MMTYPE_LEN];
 308         struct ppa_addr         fs_ppa;
 309 };
 310
 311 struct nvm_dev {
 312         struct nvm_dev_ops *ops;
 313
 314         struct list_head devices;
 315
 316         /* Media manager */
 317         struct nvmm_type *mt;
 318         void *mp;
 319
 320         /* System blocks */
 321         struct nvm_sb_info sb;
 322
 323         /* Device information */
 324         int nr_chnls;
 325         int nr_planes;
 326         int luns_per_chnl;
 327         int sec_per_pg; /* only sectors for a single page */
 328         int pgs_per_blk;
 329         int blks_per_lun;
 330         int fpg_size;
 331         int pfpg_size; /* size of buffer if all pages are to be read */
 332         int sec_size;
 333         int oob_size;
 334         int mccap;
 335         struct nvm_addr_format ppaf;
 336
 337         /* Calculated/Cached values. These do not reflect the actual usable
 338          * blocks at run-time.
 339          */
 340         int max_rq_size;
 341         int plane_mode; /* drive device in single, double or quad mode */
 342
 343         int sec_per_pl; /* all sectors across planes */
 344         int sec_per_blk;
 345         int sec_per_lun;
 346
 347         /* lower page table */
 348         int lps_per_blk;
 349         int *lptbl;
 350
 351         unsigned long total_blocks;
 352         unsigned long total_secs;
 353         int nr_luns;
 354         unsigned max_pages_per_blk;
 355
 356         unsigned long *lun_map;
 357         void *dma_pool;
 358
 359         struct nvm_id identity;
 360
 361         /* Backend device */
 362         struct request_queue *q;
 363         char name[DISK_NAME_LEN];
 364
 365         struct mutex mlock;
 366         spinlock_t lock;
 367 };
 368
 369 static inline struct ppa_addr generic_to_dev_addr(struct nvm_dev *dev,
 370                                                 struct ppa_addr r)
 371 {
 372         struct ppa_addr l;
 373
 374         l.ppa = ((u64)r.g.blk) << dev->ppaf.blk_offset;
 375         l.ppa |= ((u64)r.g.pg) << dev->ppaf.pg_offset;
 376         l.ppa |= ((u64)r.g.sec) << dev->ppaf.sect_offset;
 377         l.ppa |= ((u64)r.g.pl) << dev->ppaf.pln_offset;
 378         l.ppa |= ((u64)r.g.lun) << dev->ppaf.lun_offset;
 379         l.ppa |= ((u64)r.g.ch) << dev->ppaf.ch_offset;
 380
 381         return l;
 382 }
 383
 384 static inline struct ppa_addr dev_to_generic_addr(struct nvm_dev *dev,
 385                                                 struct ppa_addr r)
 386 {
 387         struct ppa_addr l;
 388
 389         /*
 390          * (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
 391          */
 392         l.g.blk = (r.ppa >> dev->ppaf.blk_offset) &
 393                                         (((1 << dev->ppaf.blk_len) - 1));
 394         l.g.pg |= (r.ppa >> dev->ppaf.pg_offset) &
 395                                         (((1 << dev->ppaf.pg_len) - 1));
 396         l.g.sec |= (r.ppa >> dev->ppaf.sect_offset) &
 397                                         (((1 << dev->ppaf.sect_len) - 1));
 398         l.g.pl |= (r.ppa >> dev->ppaf.pln_offset) &
 399                                         (((1 << dev->ppaf.pln_len) - 1));
 400         l.g.lun |= (r.ppa >> dev->ppaf.lun_offset) &
 401                                         (((1 << dev->ppaf.lun_len) - 1));
 402         l.g.ch |= (r.ppa >> dev->ppaf.ch_offset) &
 403                                         (((1 << dev->ppaf.ch_len) - 1));
 404
 405         return l;
 406 }
 407
 408 static inline int ppa_empty(struct ppa_addr ppa_addr)
 409 {
 410         return (ppa_addr.ppa == ADDR_EMPTY);
 411 }
 412
 413 static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
 414 {
 415         ppa_addr->ppa = ADDR_EMPTY;
 416 }
 417
 418 static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev,
 419                                                         struct nvm_block *blk)
 420 {
 421         struct ppa_addr ppa;
 422         struct nvm_lun *lun = blk->lun;
 423
 424         ppa.ppa = 0;
 425         ppa.g.blk = blk->id % dev->blks_per_lun;
 426         ppa.g.lun = lun->lun_id;
 427         ppa.g.ch = lun->chnl_id;
 428
 429         return ppa;
 430 }
 431
 432 static inline int ppa_to_slc(struct nvm_dev *dev, int slc_pg)
 433 {
 434         return dev->lptbl[slc_pg];
 435 }
 436
 437 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 438 typedef sector_t (nvm_tgt_capacity_fn)(void *);
 439 typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int);
 440 typedef void (nvm_tgt_exit_fn)(void *);
 441
 442 struct nvm_tgt_type {
 443         const char *name;
 444         unsigned int version[3];
 445
 446         /* target entry points */
 447         nvm_tgt_make_rq_fn *make_rq;
 448         nvm_tgt_capacity_fn *capacity;
 449         nvm_end_io_fn *end_io;
 450
 451         /* module-specific init/teardown */
 452         nvm_tgt_init_fn *init;
 453         nvm_tgt_exit_fn *exit;
 454
 455         /* For internal use */
 456         struct list_head list;
 457 };
 458
 459 extern int nvm_register_tgt_type(struct nvm_tgt_type *);
 460 extern void nvm_unregister_tgt_type(struct nvm_tgt_type *);
 461
 462 extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
 463 extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
 464
 465 typedef int (nvmm_register_fn)(struct nvm_dev *);
 466 typedef void (nvmm_unregister_fn)(struct nvm_dev *);
 467 typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *,
 468                                               struct nvm_lun *, unsigned long);
 469 typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *);
 470 typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *);
 471 typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *);
 472 typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
 473 typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
 474 typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
 475                                                                 unsigned long);
 476 typedef void (nvmm_mark_blk_fn)(struct nvm_dev *, struct ppa_addr, int);
 477 typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
 478 typedef int (nvmm_reserve_lun)(struct nvm_dev *, int);
 479 typedef void (nvmm_release_lun)(struct nvm_dev *, int);
 480 typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
 481
 482 typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
 483 typedef void (nvmm_put_area_fn)(struct nvm_dev *, sector_t);
 484
 485 struct nvmm_type {
 486         const char *name;
 487         unsigned int version[3];
 488
 489         nvmm_register_fn *register_mgr;
 490         nvmm_unregister_fn *unregister_mgr;
 491
 492         /* Block administration callbacks */
 493         nvmm_get_blk_fn *get_blk_unlocked;
 494         nvmm_put_blk_fn *put_blk_unlocked;
 495         nvmm_get_blk_fn *get_blk;
 496         nvmm_put_blk_fn *put_blk;
 497         nvmm_open_blk_fn *open_blk;
 498         nvmm_close_blk_fn *close_blk;
 499         nvmm_flush_blk_fn *flush_blk;
 500
 501         nvmm_submit_io_fn *submit_io;
 502         nvmm_erase_blk_fn *erase_blk;
 503
 504         /* Bad block mgmt */
 505         nvmm_mark_blk_fn *mark_blk;
 506
 507         /* Configuration management */
 508         nvmm_get_lun_fn *get_lun;
 509         nvmm_reserve_lun *reserve_lun;
 510         nvmm_release_lun *release_lun;
 511
 512         /* Statistics */
 513         nvmm_lun_info_print_fn *lun_info_print;
 514
 515         nvmm_get_area_fn *get_area;
 516         nvmm_put_area_fn *put_area;
 517
 518         struct list_head list;
 519 };
 520
 521 extern int nvm_register_mgr(struct nvmm_type *);
 522 extern void nvm_unregister_mgr(struct nvmm_type *);
 523
 524 extern struct nvm_block *nvm_get_blk_unlocked(struct nvm_dev *,
 525                                         struct nvm_lun *, unsigned long);
 526 extern void nvm_put_blk_unlocked(struct nvm_dev *, struct nvm_block *);
 527
 528 extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *,
 529                                                                 unsigned long);
 530 extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *);
 531
 532 extern int nvm_register(struct request_queue *, char *,
 533                                                 struct nvm_dev_ops *);
 534 extern void nvm_unregister(char *);
 535
 536 extern int nvm_submit_io(struct nvm_dev *, struct nvm_rq *);
 537 extern void nvm_generic_to_addr_mode(struct nvm_dev *, struct nvm_rq *);
 538 extern void nvm_addr_to_generic_mode(struct nvm_dev *, struct nvm_rq *);
 539 extern int nvm_set_rqd_ppalist(struct nvm_dev *, struct nvm_rq *,
 540                                                 struct ppa_addr *, int, int);
 541 extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
 542 extern int nvm_erase_ppa(struct nvm_dev *, struct ppa_addr *, int);
 543 extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
 544 extern void nvm_end_io(struct nvm_rq *, int);
 545 extern int nvm_submit_ppa(struct nvm_dev *, struct ppa_addr *, int, int, int,
 546                                                                 void *, int);
 547 extern int nvm_submit_ppa_list(struct nvm_dev *, struct ppa_addr *, int, int,
 548                                                         int, void *, int);
 549 extern int nvm_bb_tbl_fold(struct nvm_dev *, u8 *, int);
 550 extern int nvm_get_bb_tbl(struct nvm_dev *, struct ppa_addr, u8 *);
 551
 552 /* sysblk.c */
 553 #define NVM_SYSBLK_MAGIC 0x4E564D53 /* "NVMS" */
 554
 555 /* system block on disk representation */
 556 struct nvm_system_block {
 557         __be32                  magic;          /* magic signature */
 558         __be32                  seqnr;          /* sequence number */
 559         __be32                  erase_cnt;      /* erase count */
 560         __be16                  version;        /* version number */
 561         u8                      mmtype[NVM_MMTYPE_LEN]; /* media manager name */
 562         __be64                  fs_ppa;         /* PPA for media manager
 563                                                  * superblock */
 564 };
 565
 566 extern int nvm_get_sysblock(struct nvm_dev *, struct nvm_sb_info *);
 567 extern int nvm_update_sysblock(struct nvm_dev *, struct nvm_sb_info *);
 568 extern int nvm_init_sysblock(struct nvm_dev *, struct nvm_sb_info *);
 569
 570 extern int nvm_dev_factory(struct nvm_dev *, int flags);
 571
 572 #define nvm_for_each_lun_ppa(dev, ppa, chid, lunid)                     \
 573         for ((chid) = 0, (ppa).ppa = 0; (chid) < (dev)->nr_chnls;       \
 574                                         (chid)++, (ppa).g.ch = (chid))  \
 575                 for ((lunid) = 0; (lunid) < (dev)->luns_per_chnl;       \
 576                                         (lunid)++, (ppa).g.lun = (lunid))
 577
 578 #else /* CONFIG_NVM */
 579 struct nvm_dev_ops;
 580
 581 static inline int nvm_register(struct request_queue *q, char *disk_name,
 582                                                         struct nvm_dev_ops *ops)
 583 {
 584         return -EINVAL;
 585 }
 586 static inline void nvm_unregister(char *disk_name) {}
 587 #endif /* CONFIG_NVM */
 588 #endif /* LIGHTNVM.H */