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