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