kernel/include/linux/lightnvm.h

   1 #ifndef NVM_H
   2 #define NVM_H
   3
   4 enum {
   5         NVM_IO_OK = 0,
   6         NVM_IO_REQUEUE = 1,
   7         NVM_IO_DONE = 2,
   8         NVM_IO_ERR = 3,
   9
  10         NVM_IOTYPE_NONE = 0,
  11         NVM_IOTYPE_GC = 1,
  12 };
  13
  14 #ifdef CONFIG_NVM
  15
  16 #include <linux/blkdev.h>
  17 #include <linux/types.h>
  18 #include <linux/file.h>
  19 #include <linux/dmapool.h>
  20
  21 enum {
  22         /* HW Responsibilities */
  23         NVM_RSP_L2P     = 1 << 0,
  24         NVM_RSP_ECC     = 1 << 1,
  25
  26         /* Physical Adressing Mode */
  27         NVM_ADDRMODE_LINEAR     = 0,
  28         NVM_ADDRMODE_CHANNEL    = 1,
  29
  30         /* Plane programming mode for LUN */
  31         NVM_PLANE_SINGLE        = 0,
  32         NVM_PLANE_DOUBLE        = 1,
  33         NVM_PLANE_QUAD          = 2,
  34
  35         /* Status codes */
  36         NVM_RSP_SUCCESS         = 0x0,
  37         NVM_RSP_NOT_CHANGEABLE  = 0x1,
  38         NVM_RSP_ERR_FAILWRITE   = 0x40ff,
  39         NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
  40
  41         /* Device opcodes */
  42         NVM_OP_HBREAD           = 0x02,
  43         NVM_OP_HBWRITE          = 0x81,
  44         NVM_OP_PWRITE           = 0x91,
  45         NVM_OP_PREAD            = 0x92,
  46         NVM_OP_ERASE            = 0x90,
  47
  48         /* PPA Command Flags */
  49         NVM_IO_SNGL_ACCESS      = 0x0,
  50         NVM_IO_DUAL_ACCESS      = 0x1,
  51         NVM_IO_QUAD_ACCESS      = 0x2,
  52
  53         /* NAND Access Modes */
  54         NVM_IO_SUSPEND          = 0x80,
  55         NVM_IO_SLC_MODE         = 0x100,
  56         NVM_IO_SCRAMBLE_DISABLE = 0x200,
  57
  58         /* Block Types */
  59         NVM_BLK_T_FREE          = 0x0,
  60         NVM_BLK_T_BAD           = 0x1,
  61         NVM_BLK_T_DEV           = 0x2,
  62         NVM_BLK_T_HOST          = 0x4,
  63 };
  64
  65 struct nvm_id_group {
  66         u8      mtype;
  67         u8      fmtype;
  68         u8      num_ch;
  69         u8      num_lun;
  70         u8      num_pln;
  71         u16     num_blk;
  72         u16     num_pg;
  73         u16     fpg_sz;
  74         u16     csecs;
  75         u16     sos;
  76         u32     trdt;
  77         u32     trdm;
  78         u32     tprt;
  79         u32     tprm;
  80         u32     tbet;
  81         u32     tbem;
  82         u32     mpos;
  83         u32     mccap;
  84         u16     cpar;
  85 };
  86
  87 struct nvm_addr_format {
  88         u8      ch_offset;
  89         u8      ch_len;
  90         u8      lun_offset;
  91         u8      lun_len;
  92         u8      pln_offset;
  93         u8      pln_len;
  94         u8      blk_offset;
  95         u8      blk_len;
  96         u8      pg_offset;
  97         u8      pg_len;
  98         u8      sect_offset;
  99         u8      sect_len;
 100 };
 101
 102 struct nvm_id {
 103         u8      ver_id;
 104         u8      vmnt;
 105         u8      cgrps;
 106         u32     cap;
 107         u32     dom;
 108         struct nvm_addr_format ppaf;
 109         struct nvm_id_group groups[4];
 110 } __packed;
 111
 112 struct nvm_target {
 113         struct list_head list;
 114         struct nvm_tgt_type *type;
 115         struct gendisk *disk;
 116 };
 117
 118 struct nvm_tgt_instance {
 119         struct nvm_tgt_type *tt;
 120 };
 121
 122 #define ADDR_EMPTY (~0ULL)
 123
 124 #define NVM_VERSION_MAJOR 1
 125 #define NVM_VERSION_MINOR 0
 126 #define NVM_VERSION_PATCH 0
 127
 128 #define NVM_BLK_BITS (16)
 129 #define NVM_PG_BITS  (16)
 130 #define NVM_SEC_BITS (8)
 131 #define NVM_PL_BITS  (8)
 132 #define NVM_LUN_BITS (8)
 133 #define NVM_CH_BITS  (8)
 134
 135 struct ppa_addr {
 136         /* Generic structure for all addresses */
 137         union {
 138                 struct {
 139                         u64 blk         : NVM_BLK_BITS;
 140                         u64 pg          : NVM_PG_BITS;
 141                         u64 sec         : NVM_SEC_BITS;
 142                         u64 pl          : NVM_PL_BITS;
 143                         u64 lun         : NVM_LUN_BITS;
 144                         u64 ch          : NVM_CH_BITS;
 145                 } g;
 146
 147                 u64 ppa;
 148         };
 149 };
 150
 151 struct nvm_rq {
 152         struct nvm_tgt_instance *ins;
 153         struct nvm_dev *dev;
 154
 155         struct bio *bio;
 156
 157         union {
 158                 struct ppa_addr ppa_addr;
 159                 dma_addr_t dma_ppa_list;
 160         };
 161
 162         struct ppa_addr *ppa_list;
 163
 164         void *metadata;
 165         dma_addr_t dma_metadata;
 166
 167         uint8_t opcode;
 168         uint16_t nr_pages;
 169         uint16_t flags;
 170 };
 171
 172 static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
 173 {
 174         return pdu - sizeof(struct nvm_rq);
 175 }
 176
 177 static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
 178 {
 179         return rqdata + 1;
 180 }
 181
 182 struct nvm_block;
 183
 184 typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
 185 typedef int (nvm_bb_update_fn)(struct ppa_addr, int, u8 *, void *);
 186 typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
 187 typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32,
 188                                 nvm_l2p_update_fn *, void *);
 189 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, int,
 190                                 nvm_bb_update_fn *, void *);
 191 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct nvm_rq *, int);
 192 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
 193 typedef int (nvm_erase_blk_fn)(struct nvm_dev *, struct nvm_rq *);
 194 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
 195 typedef void (nvm_destroy_dma_pool_fn)(void *);
 196 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
 197                                                                 dma_addr_t *);
 198 typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
 199
 200 struct nvm_dev_ops {
 201         nvm_id_fn               *identity;
 202         nvm_get_l2p_tbl_fn      *get_l2p_tbl;
 203         nvm_op_bb_tbl_fn        *get_bb_tbl;
 204         nvm_op_set_bb_fn        *set_bb_tbl;
 205
 206         nvm_submit_io_fn        *submit_io;
 207         nvm_erase_blk_fn        *erase_block;
 208
 209         nvm_create_dma_pool_fn  *create_dma_pool;
 210         nvm_destroy_dma_pool_fn *destroy_dma_pool;
 211         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
 212         nvm_dev_dma_free_fn     *dev_dma_free;
 213
 214         unsigned int            max_phys_sect;
 215 };
 216
 217 struct nvm_lun {
 218         int id;
 219
 220         int lun_id;
 221         int chnl_id;
 222
 223         unsigned int nr_inuse_blocks;   /* Number of used blocks */
 224         unsigned int nr_free_blocks;    /* Number of unused blocks */
 225         unsigned int nr_bad_blocks;     /* Number of bad blocks */
 226         struct nvm_block *blocks;
 227
 228         spinlock_t lock;
 229 };
 230
 231 struct nvm_block {
 232         struct list_head list;
 233         struct nvm_lun *lun;
 234         unsigned long id;
 235
 236         void *priv;
 237         int type;
 238 };
 239
 240 struct nvm_dev {
 241         struct nvm_dev_ops *ops;
 242
 243         struct list_head devices;
 244         struct list_head online_targets;
 245
 246         /* Media manager */
 247         struct nvmm_type *mt;
 248         void *mp;
 249
 250         /* Device information */
 251         int nr_chnls;
 252         int nr_planes;
 253         int luns_per_chnl;
 254         int sec_per_pg; /* only sectors for a single page */
 255         int pgs_per_blk;
 256         int blks_per_lun;
 257         int sec_size;
 258         int oob_size;
 259         struct nvm_addr_format ppaf;
 260
 261         /* Calculated/Cached values. These do not reflect the actual usable
 262          * blocks at run-time.
 263          */
 264         int max_rq_size;
 265         int plane_mode; /* drive device in single, double or quad mode */
 266
 267         int sec_per_pl; /* all sectors across planes */
 268         int sec_per_blk;
 269         int sec_per_lun;
 270
 271         unsigned long total_pages;
 272         unsigned long total_blocks;
 273         int nr_luns;
 274         unsigned max_pages_per_blk;
 275
 276         void *ppalist_pool;
 277
 278         struct nvm_id identity;
 279
 280         /* Backend device */
 281         struct request_queue *q;
 282         char name[DISK_NAME_LEN];
 283 };
 284
 285 static inline struct ppa_addr generic_to_dev_addr(struct nvm_dev *dev,
 286                                                 struct ppa_addr r)
 287 {
 288         struct ppa_addr l;
 289
 290         l.ppa = ((u64)r.g.blk) << dev->ppaf.blk_offset;
 291         l.ppa |= ((u64)r.g.pg) << dev->ppaf.pg_offset;
 292         l.ppa |= ((u64)r.g.sec) << dev->ppaf.sect_offset;
 293         l.ppa |= ((u64)r.g.pl) << dev->ppaf.pln_offset;
 294         l.ppa |= ((u64)r.g.lun) << dev->ppaf.lun_offset;
 295         l.ppa |= ((u64)r.g.ch) << dev->ppaf.ch_offset;
 296
 297         return l;
 298 }
 299
 300 static inline struct ppa_addr dev_to_generic_addr(struct nvm_dev *dev,
 301                                                 struct ppa_addr r)
 302 {
 303         struct ppa_addr l;
 304
 305         /*
 306          * (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
 307          */
 308         l.g.blk = (r.ppa >> dev->ppaf.blk_offset) &
 309                                         (((1 << dev->ppaf.blk_len) - 1));
 310         l.g.pg |= (r.ppa >> dev->ppaf.pg_offset) &
 311                                         (((1 << dev->ppaf.pg_len) - 1));
 312         l.g.sec |= (r.ppa >> dev->ppaf.sect_offset) &
 313                                         (((1 << dev->ppaf.sect_len) - 1));
 314         l.g.pl |= (r.ppa >> dev->ppaf.pln_offset) &
 315                                         (((1 << dev->ppaf.pln_len) - 1));
 316         l.g.lun |= (r.ppa >> dev->ppaf.lun_offset) &
 317                                         (((1 << dev->ppaf.lun_len) - 1));
 318         l.g.ch |= (r.ppa >> dev->ppaf.ch_offset) &
 319                                         (((1 << dev->ppaf.ch_len) - 1));
 320
 321         return l;
 322 }
 323
 324 static inline int ppa_empty(struct ppa_addr ppa_addr)
 325 {
 326         return (ppa_addr.ppa == ADDR_EMPTY);
 327 }
 328
 329 static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
 330 {
 331         ppa_addr->ppa = ADDR_EMPTY;
 332 }
 333
 334 static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev,
 335                                                         struct nvm_block *blk)
 336 {
 337         struct ppa_addr ppa;
 338         struct nvm_lun *lun = blk->lun;
 339
 340         ppa.ppa = 0;
 341         ppa.g.blk = blk->id % dev->blks_per_lun;
 342         ppa.g.lun = lun->lun_id;
 343         ppa.g.ch = lun->chnl_id;
 344
 345         return ppa;
 346 }
 347
 348 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 349 typedef sector_t (nvm_tgt_capacity_fn)(void *);
 350 typedef int (nvm_tgt_end_io_fn)(struct nvm_rq *, int);
 351 typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int);
 352 typedef void (nvm_tgt_exit_fn)(void *);
 353
 354 struct nvm_tgt_type {
 355         const char *name;
 356         unsigned int version[3];
 357
 358         /* target entry points */
 359         nvm_tgt_make_rq_fn *make_rq;
 360         nvm_tgt_capacity_fn *capacity;
 361         nvm_tgt_end_io_fn *end_io;
 362
 363         /* module-specific init/teardown */
 364         nvm_tgt_init_fn *init;
 365         nvm_tgt_exit_fn *exit;
 366
 367         /* For internal use */
 368         struct list_head list;
 369 };
 370
 371 extern int nvm_register_target(struct nvm_tgt_type *);
 372 extern void nvm_unregister_target(struct nvm_tgt_type *);
 373
 374 extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
 375 extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
 376
 377 typedef int (nvmm_register_fn)(struct nvm_dev *);
 378 typedef void (nvmm_unregister_fn)(struct nvm_dev *);
 379 typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *,
 380                                               struct nvm_lun *, unsigned long);
 381 typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *);
 382 typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *);
 383 typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *);
 384 typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
 385 typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
 386 typedef int (nvmm_end_io_fn)(struct nvm_rq *, int);
 387 typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
 388                                                                 unsigned long);
 389 typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
 390 typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
 391
 392 struct nvmm_type {
 393         const char *name;
 394         unsigned int version[3];
 395
 396         nvmm_register_fn *register_mgr;
 397         nvmm_unregister_fn *unregister_mgr;
 398
 399         /* Block administration callbacks */
 400         nvmm_get_blk_fn *get_blk;
 401         nvmm_put_blk_fn *put_blk;
 402         nvmm_open_blk_fn *open_blk;
 403         nvmm_close_blk_fn *close_blk;
 404         nvmm_flush_blk_fn *flush_blk;
 405
 406         nvmm_submit_io_fn *submit_io;
 407         nvmm_end_io_fn *end_io;
 408         nvmm_erase_blk_fn *erase_blk;
 409
 410         /* Configuration management */
 411         nvmm_get_lun_fn *get_lun;
 412
 413         /* Statistics */
 414         nvmm_lun_info_print_fn *lun_info_print;
 415         struct list_head list;
 416 };
 417
 418 extern int nvm_register_mgr(struct nvmm_type *);
 419 extern void nvm_unregister_mgr(struct nvmm_type *);
 420
 421 extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *,
 422                                                                 unsigned long);
 423 extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *);
 424
 425 extern int nvm_register(struct request_queue *, char *,
 426                                                 struct nvm_dev_ops *);
 427 extern void nvm_unregister(char *);
 428
 429 extern int nvm_submit_io(struct nvm_dev *, struct nvm_rq *);
 430 extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
 431 #else /* CONFIG_NVM */
 432 struct nvm_dev_ops;
 433
 434 static inline int nvm_register(struct request_queue *q, char *disk_name,
 435                                                         struct nvm_dev_ops *ops)
 436 {
 437         return -EINVAL;
 438 }
 439 static inline void nvm_unregister(char *disk_name) {}
 440 #endif /* CONFIG_NVM */
 441 #endif /* LIGHTNVM.H */