include/linux/lightnvm.h

   1 #ifndef NVM_H
   2 #define NVM_H
   3
   4 #include <linux/blkdev.h>
   5 #include <linux/types.h>
   6 #include <uapi/linux/lightnvm.h>
   7
   8 enum {
   9         NVM_IO_OK = 0,
  10         NVM_IO_REQUEUE = 1,
  11         NVM_IO_DONE = 2,
  12         NVM_IO_ERR = 3,
  13
  14         NVM_IOTYPE_NONE = 0,
  15         NVM_IOTYPE_GC = 1,
  16 };
  17
  18 #define NVM_BLK_BITS (16)
  19 #define NVM_PG_BITS  (16)
  20 #define NVM_SEC_BITS (8)
  21 #define NVM_PL_BITS  (8)
  22 #define NVM_LUN_BITS (8)
  23 #define NVM_CH_BITS  (7)
  24
  25 struct ppa_addr {
  26         /* Generic structure for all addresses */
  27         union {
  28                 struct {
  29                         u64 blk         : NVM_BLK_BITS;
  30                         u64 pg          : NVM_PG_BITS;
  31                         u64 sec         : NVM_SEC_BITS;
  32                         u64 pl          : NVM_PL_BITS;
  33                         u64 lun         : NVM_LUN_BITS;
  34                         u64 ch          : NVM_CH_BITS;
  35                         u64 reserved    : 1;
  36                 } g;
  37
  38                 struct {
  39                         u64 line        : 63;
  40                         u64 is_cached   : 1;
  41                 } c;
  42
  43                 u64 ppa;
  44         };
  45 };
  46
  47 struct nvm_rq;
  48 struct nvm_id;
  49 struct nvm_dev;
  50
  51 typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
  52 typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
  53 typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
  54                                 nvm_l2p_update_fn *, void *);
  55 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
  56 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
  57 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
  58 typedef int (nvm_erase_blk_fn)(struct nvm_dev *, struct nvm_rq *);
  59 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
  60 typedef void (nvm_destroy_dma_pool_fn)(void *);
  61 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
  62                                                                 dma_addr_t *);
  63 typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
  64
  65 struct nvm_dev_ops {
  66         nvm_id_fn               *identity;
  67         nvm_get_l2p_tbl_fn      *get_l2p_tbl;
  68         nvm_op_bb_tbl_fn        *get_bb_tbl;
  69         nvm_op_set_bb_fn        *set_bb_tbl;
  70
  71         nvm_submit_io_fn        *submit_io;
  72         nvm_erase_blk_fn        *erase_block;
  73
  74         nvm_create_dma_pool_fn  *create_dma_pool;
  75         nvm_destroy_dma_pool_fn *destroy_dma_pool;
  76         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
  77         nvm_dev_dma_free_fn     *dev_dma_free;
  78
  79         unsigned int            max_phys_sect;
  80 };
  81
  82
  83
  84 #ifdef CONFIG_NVM
  85
  86 #include <linux/blkdev.h>
  87 #include <linux/file.h>
  88 #include <linux/dmapool.h>
  89 #include <uapi/linux/lightnvm.h>
  90
  91 enum {
  92         /* HW Responsibilities */
  93         NVM_RSP_L2P     = 1 << 0,
  94         NVM_RSP_ECC     = 1 << 1,
  95
  96         /* Physical Adressing Mode */
  97         NVM_ADDRMODE_LINEAR     = 0,
  98         NVM_ADDRMODE_CHANNEL    = 1,
  99
 100         /* Plane programming mode for LUN */
 101         NVM_PLANE_SINGLE        = 1,
 102         NVM_PLANE_DOUBLE        = 2,
 103         NVM_PLANE_QUAD          = 4,
 104
 105         /* Status codes */
 106         NVM_RSP_SUCCESS         = 0x0,
 107         NVM_RSP_NOT_CHANGEABLE  = 0x1,
 108         NVM_RSP_ERR_FAILWRITE   = 0x40ff,
 109         NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
 110
 111         /* Device opcodes */
 112         NVM_OP_HBREAD           = 0x02,
 113         NVM_OP_HBWRITE          = 0x81,
 114         NVM_OP_PWRITE           = 0x91,
 115         NVM_OP_PREAD            = 0x92,
 116         NVM_OP_ERASE            = 0x90,
 117
 118         /* PPA Command Flags */
 119         NVM_IO_SNGL_ACCESS      = 0x0,
 120         NVM_IO_DUAL_ACCESS      = 0x1,
 121         NVM_IO_QUAD_ACCESS      = 0x2,
 122
 123         /* NAND Access Modes */
 124         NVM_IO_SUSPEND          = 0x80,
 125         NVM_IO_SLC_MODE         = 0x100,
 126         NVM_IO_SCRAMBLE_DISABLE = 0x200,
 127
 128         /* Block Types */
 129         NVM_BLK_T_FREE          = 0x0,
 130         NVM_BLK_T_BAD           = 0x1,
 131         NVM_BLK_T_GRWN_BAD      = 0x2,
 132         NVM_BLK_T_DEV           = 0x4,
 133         NVM_BLK_T_HOST          = 0x8,
 134
 135         /* Memory capabilities */
 136         NVM_ID_CAP_SLC          = 0x1,
 137         NVM_ID_CAP_CMD_SUSPEND  = 0x2,
 138         NVM_ID_CAP_SCRAMBLE     = 0x4,
 139         NVM_ID_CAP_ENCRYPT      = 0x8,
 140
 141         /* Memory types */
 142         NVM_ID_FMTYPE_SLC       = 0,
 143         NVM_ID_FMTYPE_MLC       = 1,
 144
 145         /* Device capabilities */
 146         NVM_ID_DCAP_BBLKMGMT    = 0x1,
 147         NVM_UD_DCAP_ECC         = 0x2,
 148 };
 149
 150 struct nvm_id_lp_mlc {
 151         u16     num_pairs;
 152         u8      pairs[886];
 153 };
 154
 155 struct nvm_id_lp_tbl {
 156         __u8    id[8];
 157         struct nvm_id_lp_mlc mlc;
 158 };
 159
 160 struct nvm_id_group {
 161         u8      mtype;
 162         u8      fmtype;
 163         u8      num_ch;
 164         u8      num_lun;
 165         u8      num_pln;
 166         u16     num_blk;
 167         u16     num_pg;
 168         u16     fpg_sz;
 169         u16     csecs;
 170         u16     sos;
 171         u32     trdt;
 172         u32     trdm;
 173         u32     tprt;
 174         u32     tprm;
 175         u32     tbet;
 176         u32     tbem;
 177         u32     mpos;
 178         u32     mccap;
 179         u16     cpar;
 180
 181         struct nvm_id_lp_tbl lptbl;
 182 };
 183
 184 struct nvm_addr_format {
 185         u8      ch_offset;
 186         u8      ch_len;
 187         u8      lun_offset;
 188         u8      lun_len;
 189         u8      pln_offset;
 190         u8      pln_len;
 191         u8      blk_offset;
 192         u8      blk_len;
 193         u8      pg_offset;
 194         u8      pg_len;
 195         u8      sect_offset;
 196         u8      sect_len;
 197 };
 198
 199 struct nvm_id {
 200         u8      ver_id;
 201         u8      vmnt;
 202         u8      cgrps;
 203         u32     cap;
 204         u32     dom;
 205         struct nvm_addr_format ppaf;
 206         struct nvm_id_group groups[4];
 207 } __packed;
 208
 209 struct nvm_target {
 210         struct list_head list;
 211         struct nvm_dev *dev;
 212         struct nvm_tgt_type *type;
 213         struct gendisk *disk;
 214 };
 215
 216 struct nvm_tgt_instance {
 217         struct nvm_tgt_type *tt;
 218 };
 219
 220 #define ADDR_EMPTY (~0ULL)
 221
 222 #define NVM_VERSION_MAJOR 1
 223 #define NVM_VERSION_MINOR 0
 224 #define NVM_VERSION_PATCH 0
 225
 226 struct nvm_rq;
 227 typedef void (nvm_end_io_fn)(struct nvm_rq *);
 228
 229 struct nvm_rq {
 230         struct nvm_tgt_instance *ins;
 231         struct nvm_dev *dev;
 232
 233         struct bio *bio;
 234
 235         union {
 236                 struct ppa_addr ppa_addr;
 237                 dma_addr_t dma_ppa_list;
 238         };
 239
 240         struct ppa_addr *ppa_list;
 241
 242         void *meta_list;
 243         dma_addr_t dma_meta_list;
 244
 245         struct completion *wait;
 246         nvm_end_io_fn *end_io;
 247
 248         uint8_t opcode;
 249         uint16_t nr_ppas;
 250         uint16_t flags;
 251
 252         u64 ppa_status; /* ppa media status */
 253         int error;
 254 };
 255
 256 static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
 257 {
 258         return pdu - sizeof(struct nvm_rq);
 259 }
 260
 261 static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
 262 {
 263         return rqdata + 1;
 264 }
 265
 266 struct nvm_block;
 267
 268 struct nvm_lun {
 269         int id;
 270
 271         int lun_id;
 272         int chnl_id;
 273
 274         spinlock_t lock;
 275
 276         unsigned int nr_free_blocks;    /* Number of unused blocks */
 277         struct nvm_block *blocks;
 278 };
 279
 280 enum {
 281         NVM_BLK_ST_FREE =       0x1,    /* Free block */
 282         NVM_BLK_ST_TGT =        0x2,    /* Block in use by target */
 283         NVM_BLK_ST_BAD =        0x8,    /* Bad block */
 284 };
 285
 286 struct nvm_block {
 287         struct list_head list;
 288         struct nvm_lun *lun;
 289         unsigned long id;
 290
 291         void *priv;
 292         int state;
 293 };
 294
 295 /* system block cpu representation */
 296 struct nvm_sb_info {
 297         unsigned long           seqnr;
 298         unsigned long           erase_cnt;
 299         unsigned int            version;
 300         char                    mmtype[NVM_MMTYPE_LEN];
 301         struct ppa_addr         fs_ppa;
 302 };
 303
 304 struct nvm_dev {
 305         struct nvm_dev_ops *ops;
 306
 307         struct list_head devices;
 308
 309         /* Media manager */
 310         struct nvmm_type *mt;
 311         void *mp;
 312
 313         /* System blocks */
 314         struct nvm_sb_info sb;
 315
 316         /* Device information */
 317         int nr_chnls;
 318         int nr_planes;
 319         int luns_per_chnl;
 320         int sec_per_pg; /* only sectors for a single page */
 321         int pgs_per_blk;
 322         int blks_per_lun;
 323         int fpg_size;
 324         int pfpg_size; /* size of buffer if all pages are to be read */
 325         int sec_size;
 326         int oob_size;
 327         int mccap;
 328         struct nvm_addr_format ppaf;
 329
 330         /* Calculated/Cached values. These do not reflect the actual usable
 331          * blocks at run-time.
 332          */
 333         int max_rq_size;
 334         int plane_mode; /* drive device in single, double or quad mode */
 335
 336         int sec_per_pl; /* all sectors across planes */
 337         int sec_per_blk;
 338         int sec_per_lun;
 339
 340         /* lower page table */
 341         int lps_per_blk;
 342         int *lptbl;
 343
 344         unsigned long total_blocks;
 345         unsigned long total_secs;
 346         int nr_luns;
 347
 348         unsigned long *lun_map;
 349         void *dma_pool;
 350
 351         struct nvm_id identity;
 352
 353         /* Backend device */
 354         struct request_queue *q;
 355         struct device dev;
 356         struct device *parent_dev;
 357         char name[DISK_NAME_LEN];
 358         void *private_data;
 359
 360         struct mutex mlock;
 361         spinlock_t lock;
 362 };
 363
 364 static inline struct ppa_addr generic_to_dev_addr(struct nvm_dev *dev,
 365                                                 struct ppa_addr r)
 366 {
 367         struct ppa_addr l;
 368
 369         l.ppa = ((u64)r.g.blk) << dev->ppaf.blk_offset;
 370         l.ppa |= ((u64)r.g.pg) << dev->ppaf.pg_offset;
 371         l.ppa |= ((u64)r.g.sec) << dev->ppaf.sect_offset;
 372         l.ppa |= ((u64)r.g.pl) << dev->ppaf.pln_offset;
 373         l.ppa |= ((u64)r.g.lun) << dev->ppaf.lun_offset;
 374         l.ppa |= ((u64)r.g.ch) << dev->ppaf.ch_offset;
 375
 376         return l;
 377 }
 378
 379 static inline struct ppa_addr dev_to_generic_addr(struct nvm_dev *dev,
 380                                                 struct ppa_addr r)
 381 {
 382         struct ppa_addr l;
 383
 384         l.ppa = 0;
 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 struct nvm_tgt_type *nvm_find_target_type(const char *, int);
 456
 457 extern int nvm_register_tgt_type(struct nvm_tgt_type *);
 458 extern void nvm_unregister_tgt_type(struct nvm_tgt_type *);
 459
 460 extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
 461 extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
 462
 463 typedef int (nvmm_register_fn)(struct nvm_dev *);
 464 typedef void (nvmm_unregister_fn)(struct nvm_dev *);
 465
 466 typedef int (nvmm_create_tgt_fn)(struct nvm_dev *, struct nvm_ioctl_create *);
 467 typedef int (nvmm_remove_tgt_fn)(struct nvm_dev *, struct nvm_ioctl_remove *);
 468 typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *,
 469                                               struct nvm_lun *, unsigned long);
 470 typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *);
 471 typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *);
 472 typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *);
 473 typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
 474 typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
 475 typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
 476                                                                 unsigned long);
 477 typedef void (nvmm_mark_blk_fn)(struct nvm_dev *, struct ppa_addr, int);
 478 typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
 479 typedef int (nvmm_reserve_lun)(struct nvm_dev *, int);
 480 typedef void (nvmm_release_lun)(struct nvm_dev *, int);
 481 typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
 482
 483 typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
 484 typedef void (nvmm_put_area_fn)(struct nvm_dev *, sector_t);
 485
 486 struct nvmm_type {
 487         const char *name;
 488         unsigned int version[3];
 489
 490         nvmm_register_fn *register_mgr;
 491         nvmm_unregister_fn *unregister_mgr;
 492
 493         nvmm_create_tgt_fn *create_tgt;
 494         nvmm_remove_tgt_fn *remove_tgt;
 495
 496         /* Block administration callbacks */
 497         nvmm_get_blk_fn *get_blk;
 498         nvmm_put_blk_fn *put_blk;
 499         nvmm_open_blk_fn *open_blk;
 500         nvmm_close_blk_fn *close_blk;
 501         nvmm_flush_blk_fn *flush_blk;
 502
 503         nvmm_submit_io_fn *submit_io;
 504         nvmm_erase_blk_fn *erase_blk;
 505
 506         /* Bad block mgmt */
 507         nvmm_mark_blk_fn *mark_blk;
 508
 509         /* Configuration management */
 510         nvmm_get_lun_fn *get_lun;
 511         nvmm_reserve_lun *reserve_lun;
 512         nvmm_release_lun *release_lun;
 513
 514         /* Statistics */
 515         nvmm_lun_info_print_fn *lun_info_print;
 516
 517         nvmm_get_area_fn *get_area;
 518         nvmm_put_area_fn *put_area;
 519
 520         struct list_head list;
 521 };
 522
 523 extern int nvm_register_mgr(struct nvmm_type *);
 524 extern void nvm_unregister_mgr(struct nvmm_type *);
 525
 526 extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *,
 527                                                                 unsigned long);
 528 extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *);
 529
 530 extern struct nvm_dev *nvm_alloc_dev(int);
 531 extern int nvm_register(struct nvm_dev *);
 532 extern void nvm_unregister(struct nvm_dev *);
 533
 534 void nvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type);
 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                                         const 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 struct nvm_dev *nvm_alloc_dev(int node)
 582 {
 583         return ERR_PTR(-EINVAL);
 584 }
 585 static inline int nvm_register(struct nvm_dev *dev)
 586 {
 587         return -EINVAL;
 588 }
 589 static inline void nvm_unregister(struct nvm_dev *dev) {}
 590 #endif /* CONFIG_NVM */
 591 #endif /* LIGHTNVM.H */