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 struct nvm_tgt_dev;
  51
  52 typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
  53 typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
  54 typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
  55                                 nvm_l2p_update_fn *, void *);
  56 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
  57 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
  58 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
  59 typedef int (nvm_erase_blk_fn)(struct nvm_dev *, struct nvm_rq *);
  60 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
  61 typedef void (nvm_destroy_dma_pool_fn)(void *);
  62 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
  63                                                                 dma_addr_t *);
  64 typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
  65
  66 struct nvm_dev_ops {
  67         nvm_id_fn               *identity;
  68         nvm_get_l2p_tbl_fn      *get_l2p_tbl;
  69         nvm_op_bb_tbl_fn        *get_bb_tbl;
  70         nvm_op_set_bb_fn        *set_bb_tbl;
  71
  72         nvm_submit_io_fn        *submit_io;
  73         nvm_erase_blk_fn        *erase_block;
  74
  75         nvm_create_dma_pool_fn  *create_dma_pool;
  76         nvm_destroy_dma_pool_fn *destroy_dma_pool;
  77         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
  78         nvm_dev_dma_free_fn     *dev_dma_free;
  79
  80         unsigned int            max_phys_sect;
  81 };
  82
  83 #ifdef CONFIG_NVM
  84
  85 #include <linux/blkdev.h>
  86 #include <linux/file.h>
  87 #include <linux/dmapool.h>
  88 #include <uapi/linux/lightnvm.h>
  89
  90 enum {
  91         /* HW Responsibilities */
  92         NVM_RSP_L2P     = 1 << 0,
  93         NVM_RSP_ECC     = 1 << 1,
  94
  95         /* Physical Adressing Mode */
  96         NVM_ADDRMODE_LINEAR     = 0,
  97         NVM_ADDRMODE_CHANNEL    = 1,
  98
  99         /* Plane programming mode for LUN */
 100         NVM_PLANE_SINGLE        = 1,
 101         NVM_PLANE_DOUBLE        = 2,
 102         NVM_PLANE_QUAD          = 4,
 103
 104         /* Status codes */
 105         NVM_RSP_SUCCESS         = 0x0,
 106         NVM_RSP_NOT_CHANGEABLE  = 0x1,
 107         NVM_RSP_ERR_FAILWRITE   = 0x40ff,
 108         NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
 109         NVM_RSP_ERR_FAILECC     = 0x4281,
 110         NVM_RSP_ERR_FAILCRC     = 0x4004,
 111         NVM_RSP_WARN_HIGHECC    = 0x4700,
 112
 113         /* Device opcodes */
 114         NVM_OP_HBREAD           = 0x02,
 115         NVM_OP_HBWRITE          = 0x81,
 116         NVM_OP_PWRITE           = 0x91,
 117         NVM_OP_PREAD            = 0x92,
 118         NVM_OP_ERASE            = 0x90,
 119
 120         /* PPA Command Flags */
 121         NVM_IO_SNGL_ACCESS      = 0x0,
 122         NVM_IO_DUAL_ACCESS      = 0x1,
 123         NVM_IO_QUAD_ACCESS      = 0x2,
 124
 125         /* NAND Access Modes */
 126         NVM_IO_SUSPEND          = 0x80,
 127         NVM_IO_SLC_MODE         = 0x100,
 128         NVM_IO_SCRAMBLE_DISABLE = 0x200,
 129
 130         /* Block Types */
 131         NVM_BLK_T_FREE          = 0x0,
 132         NVM_BLK_T_BAD           = 0x1,
 133         NVM_BLK_T_GRWN_BAD      = 0x2,
 134         NVM_BLK_T_DEV           = 0x4,
 135         NVM_BLK_T_HOST          = 0x8,
 136
 137         /* Memory capabilities */
 138         NVM_ID_CAP_SLC          = 0x1,
 139         NVM_ID_CAP_CMD_SUSPEND  = 0x2,
 140         NVM_ID_CAP_SCRAMBLE     = 0x4,
 141         NVM_ID_CAP_ENCRYPT      = 0x8,
 142
 143         /* Memory types */
 144         NVM_ID_FMTYPE_SLC       = 0,
 145         NVM_ID_FMTYPE_MLC       = 1,
 146
 147         /* Device capabilities */
 148         NVM_ID_DCAP_BBLKMGMT    = 0x1,
 149         NVM_UD_DCAP_ECC         = 0x2,
 150 };
 151
 152 struct nvm_id_lp_mlc {
 153         u16     num_pairs;
 154         u8      pairs[886];
 155 };
 156
 157 struct nvm_id_lp_tbl {
 158         __u8    id[8];
 159         struct nvm_id_lp_mlc mlc;
 160 };
 161
 162 struct nvm_id_group {
 163         u8      mtype;
 164         u8      fmtype;
 165         u8      num_ch;
 166         u8      num_lun;
 167         u8      num_pln;
 168         u16     num_blk;
 169         u16     num_pg;
 170         u16     fpg_sz;
 171         u16     csecs;
 172         u16     sos;
 173         u32     trdt;
 174         u32     trdm;
 175         u32     tprt;
 176         u32     tprm;
 177         u32     tbet;
 178         u32     tbem;
 179         u32     mpos;
 180         u32     mccap;
 181         u16     cpar;
 182
 183         struct nvm_id_lp_tbl lptbl;
 184 };
 185
 186 struct nvm_addr_format {
 187         u8      ch_offset;
 188         u8      ch_len;
 189         u8      lun_offset;
 190         u8      lun_len;
 191         u8      pln_offset;
 192         u8      pln_len;
 193         u8      blk_offset;
 194         u8      blk_len;
 195         u8      pg_offset;
 196         u8      pg_len;
 197         u8      sect_offset;
 198         u8      sect_len;
 199 };
 200
 201 struct nvm_id {
 202         u8      ver_id;
 203         u8      vmnt;
 204         u32     cap;
 205         u32     dom;
 206         struct nvm_addr_format ppaf;
 207         struct nvm_id_group grp;
 208 } __packed;
 209
 210 struct nvm_target {
 211         struct list_head list;
 212         struct nvm_tgt_dev *dev;
 213         struct nvm_tgt_type *type;
 214         struct gendisk *disk;
 215 };
 216
 217 #define ADDR_EMPTY (~0ULL)
 218
 219 #define NVM_VERSION_MAJOR 1
 220 #define NVM_VERSION_MINOR 0
 221 #define NVM_VERSION_PATCH 0
 222
 223 struct nvm_rq;
 224 typedef void (nvm_end_io_fn)(struct nvm_rq *);
 225
 226 struct nvm_rq {
 227         struct nvm_tgt_dev *dev;
 228
 229         struct bio *bio;
 230
 231         union {
 232                 struct ppa_addr ppa_addr;
 233                 dma_addr_t dma_ppa_list;
 234         };
 235
 236         struct ppa_addr *ppa_list;
 237
 238         void *meta_list;
 239         dma_addr_t dma_meta_list;
 240
 241         struct completion *wait;
 242         nvm_end_io_fn *end_io;
 243
 244         uint8_t opcode;
 245         uint16_t nr_ppas;
 246         uint16_t flags;
 247
 248         u64 ppa_status; /* ppa media status */
 249         int error;
 250
 251         void *private;
 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 enum {
 265         NVM_BLK_ST_FREE =       0x1,    /* Free block */
 266         NVM_BLK_ST_TGT =        0x2,    /* Block in use by target */
 267         NVM_BLK_ST_BAD =        0x8,    /* Bad block */
 268 };
 269
 270 /* Device generic information */
 271 struct nvm_geo {
 272         int nr_chnls;
 273         int nr_luns;
 274         int luns_per_chnl; /* -1 if channels are not symmetric */
 275         int nr_planes;
 276         int sec_per_pg; /* only sectors for a single page */
 277         int pgs_per_blk;
 278         int blks_per_lun;
 279         int fpg_size;
 280         int pfpg_size; /* size of buffer if all pages are to be read */
 281         int sec_size;
 282         int oob_size;
 283         int mccap;
 284         struct nvm_addr_format ppaf;
 285
 286         /* Calculated/Cached values. These do not reflect the actual usable
 287          * blocks at run-time.
 288          */
 289         int max_rq_size;
 290         int plane_mode; /* drive device in single, double or quad mode */
 291
 292         int sec_per_pl; /* all sectors across planes */
 293         int sec_per_blk;
 294         int sec_per_lun;
 295 };
 296
 297 /* sub-device structure */
 298 struct nvm_tgt_dev {
 299         /* Device information */
 300         struct nvm_geo geo;
 301
 302         /* Base ppas for target LUNs */
 303         struct ppa_addr *luns;
 304
 305         sector_t total_secs;
 306
 307         struct nvm_id identity;
 308         struct request_queue *q;
 309
 310         struct nvm_dev *parent;
 311         void *map;
 312 };
 313
 314 struct nvm_dev {
 315         struct nvm_dev_ops *ops;
 316
 317         struct list_head devices;
 318
 319         /* Device information */
 320         struct nvm_geo geo;
 321
 322           /* lower page table */
 323         int lps_per_blk;
 324         int *lptbl;
 325
 326         unsigned long total_secs;
 327
 328         unsigned long *lun_map;
 329         void *dma_pool;
 330
 331         struct nvm_id identity;
 332
 333         /* Backend device */
 334         struct request_queue *q;
 335         char name[DISK_NAME_LEN];
 336         void *private_data;
 337
 338         void *rmap;
 339
 340         struct mutex mlock;
 341         spinlock_t lock;
 342
 343         /* target management */
 344         struct list_head area_list;
 345         struct list_head targets;
 346 };
 347
 348 static inline struct ppa_addr linear_to_generic_addr(struct nvm_geo *geo,
 349                                                      u64 pba)
 350 {
 351         struct ppa_addr l;
 352         int secs, pgs, blks, luns;
 353         sector_t ppa = pba;
 354
 355         l.ppa = 0;
 356
 357         div_u64_rem(ppa, geo->sec_per_pg, &secs);
 358         l.g.sec = secs;
 359
 360         sector_div(ppa, geo->sec_per_pg);
 361         div_u64_rem(ppa, geo->pgs_per_blk, &pgs);
 362         l.g.pg = pgs;
 363
 364         sector_div(ppa, geo->pgs_per_blk);
 365         div_u64_rem(ppa, geo->blks_per_lun, &blks);
 366         l.g.blk = blks;
 367
 368         sector_div(ppa, geo->blks_per_lun);
 369         div_u64_rem(ppa, geo->luns_per_chnl, &luns);
 370         l.g.lun = luns;
 371
 372         sector_div(ppa, geo->luns_per_chnl);
 373         l.g.ch = ppa;
 374
 375         return l;
 376 }
 377
 378 static inline struct ppa_addr generic_to_dev_addr(struct nvm_tgt_dev *tgt_dev,
 379                                                   struct ppa_addr r)
 380 {
 381         struct nvm_geo *geo = &tgt_dev->geo;
 382         struct ppa_addr l;
 383
 384         l.ppa = ((u64)r.g.blk) << geo->ppaf.blk_offset;
 385         l.ppa |= ((u64)r.g.pg) << geo->ppaf.pg_offset;
 386         l.ppa |= ((u64)r.g.sec) << geo->ppaf.sect_offset;
 387         l.ppa |= ((u64)r.g.pl) << geo->ppaf.pln_offset;
 388         l.ppa |= ((u64)r.g.lun) << geo->ppaf.lun_offset;
 389         l.ppa |= ((u64)r.g.ch) << geo->ppaf.ch_offset;
 390
 391         return l;
 392 }
 393
 394 static inline struct ppa_addr dev_to_generic_addr(struct nvm_tgt_dev *tgt_dev,
 395                                                   struct ppa_addr r)
 396 {
 397         struct nvm_geo *geo = &tgt_dev->geo;
 398         struct ppa_addr l;
 399
 400         l.ppa = 0;
 401         /*
 402          * (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
 403          */
 404         l.g.blk = (r.ppa >> geo->ppaf.blk_offset) &
 405                                         (((1 << geo->ppaf.blk_len) - 1));
 406         l.g.pg |= (r.ppa >> geo->ppaf.pg_offset) &
 407                                         (((1 << geo->ppaf.pg_len) - 1));
 408         l.g.sec |= (r.ppa >> geo->ppaf.sect_offset) &
 409                                         (((1 << geo->ppaf.sect_len) - 1));
 410         l.g.pl |= (r.ppa >> geo->ppaf.pln_offset) &
 411                                         (((1 << geo->ppaf.pln_len) - 1));
 412         l.g.lun |= (r.ppa >> geo->ppaf.lun_offset) &
 413                                         (((1 << geo->ppaf.lun_len) - 1));
 414         l.g.ch |= (r.ppa >> geo->ppaf.ch_offset) &
 415                                         (((1 << geo->ppaf.ch_len) - 1));
 416
 417         return l;
 418 }
 419
 420 static inline int ppa_empty(struct ppa_addr ppa_addr)
 421 {
 422         return (ppa_addr.ppa == ADDR_EMPTY);
 423 }
 424
 425 static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
 426 {
 427         ppa_addr->ppa = ADDR_EMPTY;
 428 }
 429
 430 static inline int ppa_cmp_blk(struct ppa_addr ppa1, struct ppa_addr ppa2)
 431 {
 432         if (ppa_empty(ppa1) || ppa_empty(ppa2))
 433                 return 0;
 434
 435         return ((ppa1.g.ch == ppa2.g.ch) && (ppa1.g.lun == ppa2.g.lun) &&
 436                                         (ppa1.g.blk == ppa2.g.blk));
 437 }
 438
 439 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 440 typedef sector_t (nvm_tgt_capacity_fn)(void *);
 441 typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *);
 442 typedef void (nvm_tgt_exit_fn)(void *);
 443 typedef int (nvm_tgt_sysfs_init_fn)(struct gendisk *);
 444 typedef void (nvm_tgt_sysfs_exit_fn)(struct gendisk *);
 445
 446 struct nvm_tgt_type {
 447         const char *name;
 448         unsigned int version[3];
 449
 450         /* target entry points */
 451         nvm_tgt_make_rq_fn *make_rq;
 452         nvm_tgt_capacity_fn *capacity;
 453
 454         /* module-specific init/teardown */
 455         nvm_tgt_init_fn *init;
 456         nvm_tgt_exit_fn *exit;
 457
 458         /* sysfs */
 459         nvm_tgt_sysfs_init_fn *sysfs_init;
 460         nvm_tgt_sysfs_exit_fn *sysfs_exit;
 461
 462         /* For internal use */
 463         struct list_head list;
 464 };
 465
 466 extern struct nvm_tgt_type *nvm_find_target_type(const char *, int);
 467
 468 extern int nvm_register_tgt_type(struct nvm_tgt_type *);
 469 extern void nvm_unregister_tgt_type(struct nvm_tgt_type *);
 470
 471 extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
 472 extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
 473
 474 extern struct nvm_dev *nvm_alloc_dev(int);
 475 extern int nvm_register(struct nvm_dev *);
 476 extern void nvm_unregister(struct nvm_dev *);
 477
 478 extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *,
 479                               int, int);
 480 extern int nvm_max_phys_sects(struct nvm_tgt_dev *);
 481 extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *);
 482 extern int nvm_set_rqd_ppalist(struct nvm_dev *, struct nvm_rq *,
 483                                         const struct ppa_addr *, int, int);
 484 extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
 485 extern int nvm_erase_blk(struct nvm_tgt_dev *, struct ppa_addr *, int);
 486 extern int nvm_get_l2p_tbl(struct nvm_tgt_dev *, u64, u32, nvm_l2p_update_fn *,
 487                            void *);
 488 extern int nvm_get_area(struct nvm_tgt_dev *, sector_t *, sector_t);
 489 extern void nvm_put_area(struct nvm_tgt_dev *, sector_t);
 490 extern void nvm_end_io(struct nvm_rq *);
 491 extern int nvm_bb_tbl_fold(struct nvm_dev *, u8 *, int);
 492 extern int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr, u8 *);
 493
 494 extern int nvm_dev_factory(struct nvm_dev *, int flags);
 495
 496 extern void nvm_part_to_tgt(struct nvm_dev *, sector_t *, int);
 497
 498 #else /* CONFIG_NVM */
 499 struct nvm_dev_ops;
 500
 501 static inline struct nvm_dev *nvm_alloc_dev(int node)
 502 {
 503         return ERR_PTR(-EINVAL);
 504 }
 505 static inline int nvm_register(struct nvm_dev *dev)
 506 {
 507         return -EINVAL;
 508 }
 509 static inline void nvm_unregister(struct nvm_dev *dev) {}
 510 #endif /* CONFIG_NVM */
 511 #endif /* LIGHTNVM.H */