include/linux/lightnvm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef NVM_H
   3 #define NVM_H
   4
   5 #include <linux/blkdev.h>
   6 #include <linux/types.h>
   7 #include <uapi/linux/lightnvm.h>
   8
   9 enum {
  10         NVM_IO_OK = 0,
  11         NVM_IO_REQUEUE = 1,
  12         NVM_IO_DONE = 2,
  13         NVM_IO_ERR = 3,
  14
  15         NVM_IOTYPE_NONE = 0,
  16         NVM_IOTYPE_GC = 1,
  17 };
  18
  19 #define NVM_BLK_BITS (16)
  20 #define NVM_PG_BITS  (16)
  21 #define NVM_SEC_BITS (8)
  22 #define NVM_PL_BITS  (8)
  23 #define NVM_LUN_BITS (8)
  24 #define NVM_CH_BITS  (7)
  25
  26 struct ppa_addr {
  27         /* Generic structure for all addresses */
  28         union {
  29                 struct {
  30                         u64 blk         : NVM_BLK_BITS;
  31                         u64 pg          : NVM_PG_BITS;
  32                         u64 sec         : NVM_SEC_BITS;
  33                         u64 pl          : NVM_PL_BITS;
  34                         u64 lun         : NVM_LUN_BITS;
  35                         u64 ch          : NVM_CH_BITS;
  36                         u64 reserved    : 1;
  37                 } g;
  38
  39                 struct {
  40                         u64 line        : 63;
  41                         u64 is_cached   : 1;
  42                 } c;
  43
  44                 u64 ppa;
  45         };
  46 };
  47
  48 struct nvm_rq;
  49 struct nvm_id;
  50 struct nvm_dev;
  51 struct nvm_tgt_dev;
  52
  53 typedef int (nvm_id_fn)(struct nvm_dev *, struct nvm_id *);
  54 typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
  55 typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
  56 typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
  57 typedef int (nvm_submit_io_sync_fn)(struct nvm_dev *, struct nvm_rq *);
  58 typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
  59 typedef void (nvm_destroy_dma_pool_fn)(void *);
  60 typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
  61                                                                 dma_addr_t *);
  62 typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
  63
  64 struct nvm_dev_ops {
  65         nvm_id_fn               *identity;
  66         nvm_op_bb_tbl_fn        *get_bb_tbl;
  67         nvm_op_set_bb_fn        *set_bb_tbl;
  68
  69         nvm_submit_io_fn        *submit_io;
  70         nvm_submit_io_sync_fn   *submit_io_sync;
  71
  72         nvm_create_dma_pool_fn  *create_dma_pool;
  73         nvm_destroy_dma_pool_fn *destroy_dma_pool;
  74         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
  75         nvm_dev_dma_free_fn     *dev_dma_free;
  76
  77         unsigned int            max_phys_sect;
  78 };
  79
  80 #ifdef CONFIG_NVM
  81
  82 #include <linux/blkdev.h>
  83 #include <linux/file.h>
  84 #include <linux/dmapool.h>
  85 #include <uapi/linux/lightnvm.h>
  86
  87 enum {
  88         /* HW Responsibilities */
  89         NVM_RSP_L2P     = 1 << 0,
  90         NVM_RSP_ECC     = 1 << 1,
  91
  92         /* Physical Adressing Mode */
  93         NVM_ADDRMODE_LINEAR     = 0,
  94         NVM_ADDRMODE_CHANNEL    = 1,
  95
  96         /* Plane programming mode for LUN */
  97         NVM_PLANE_SINGLE        = 1,
  98         NVM_PLANE_DOUBLE        = 2,
  99         NVM_PLANE_QUAD          = 4,
 100
 101         /* Status codes */
 102         NVM_RSP_SUCCESS         = 0x0,
 103         NVM_RSP_NOT_CHANGEABLE  = 0x1,
 104         NVM_RSP_ERR_FAILWRITE   = 0x40ff,
 105         NVM_RSP_ERR_EMPTYPAGE   = 0x42ff,
 106         NVM_RSP_ERR_FAILECC     = 0x4281,
 107         NVM_RSP_ERR_FAILCRC     = 0x4004,
 108         NVM_RSP_WARN_HIGHECC    = 0x4700,
 109
 110         /* Device opcodes */
 111         NVM_OP_PWRITE           = 0x91,
 112         NVM_OP_PREAD            = 0x92,
 113         NVM_OP_ERASE            = 0x90,
 114
 115         /* PPA Command Flags */
 116         NVM_IO_SNGL_ACCESS      = 0x0,
 117         NVM_IO_DUAL_ACCESS      = 0x1,
 118         NVM_IO_QUAD_ACCESS      = 0x2,
 119
 120         /* NAND Access Modes */
 121         NVM_IO_SUSPEND          = 0x80,
 122         NVM_IO_SLC_MODE         = 0x100,
 123         NVM_IO_SCRAMBLE_ENABLE  = 0x200,
 124
 125         /* Block Types */
 126         NVM_BLK_T_FREE          = 0x0,
 127         NVM_BLK_T_BAD           = 0x1,
 128         NVM_BLK_T_GRWN_BAD      = 0x2,
 129         NVM_BLK_T_DEV           = 0x4,
 130         NVM_BLK_T_HOST          = 0x8,
 131
 132         /* Memory capabilities */
 133         NVM_ID_CAP_SLC          = 0x1,
 134         NVM_ID_CAP_CMD_SUSPEND  = 0x2,
 135         NVM_ID_CAP_SCRAMBLE     = 0x4,
 136         NVM_ID_CAP_ENCRYPT      = 0x8,
 137
 138         /* Memory types */
 139         NVM_ID_FMTYPE_SLC       = 0,
 140         NVM_ID_FMTYPE_MLC       = 1,
 141
 142         /* Device capabilities */
 143         NVM_ID_DCAP_BBLKMGMT    = 0x1,
 144         NVM_UD_DCAP_ECC         = 0x2,
 145 };
 146
 147 struct nvm_id_lp_mlc {
 148         u16     num_pairs;
 149         u8      pairs[886];
 150 };
 151
 152 struct nvm_id_lp_tbl {
 153         __u8    id[8];
 154         struct nvm_id_lp_mlc mlc;
 155 };
 156
 157 struct nvm_id_group {
 158         u8      mtype;
 159         u8      fmtype;
 160         u8      num_ch;
 161         u8      num_lun;
 162         u16     num_chk;
 163         u16     clba;
 164         u16     csecs;
 165         u16     sos;
 166
 167         u16     ws_min;
 168         u16     ws_opt;
 169         u16     ws_seq;
 170         u16     ws_per_chk;
 171
 172         u32     trdt;
 173         u32     trdm;
 174         u32     tprt;
 175         u32     tprm;
 176         u32     tbet;
 177         u32     tbem;
 178         u32     mpos;
 179         u32     mccap;
 180         u16     cpar;
 181
 182         /* 1.2 compatibility */
 183         u8      num_pln;
 184         u16     num_pg;
 185         u16     fpg_sz;
 186 };
 187
 188 struct nvm_addr_format {
 189         u8      ch_offset;
 190         u8      ch_len;
 191         u8      lun_offset;
 192         u8      lun_len;
 193         u8      pln_offset;
 194         u8      pln_len;
 195         u8      blk_offset;
 196         u8      blk_len;
 197         u8      pg_offset;
 198         u8      pg_len;
 199         u8      sect_offset;
 200         u8      sect_len;
 201 };
 202
 203 struct nvm_id {
 204         u8      ver_id;
 205         u8      vmnt;
 206         u32     cap;
 207         u32     dom;
 208         struct nvm_addr_format ppaf;
 209         struct nvm_id_group grp;
 210 } __packed;
 211
 212 struct nvm_target {
 213         struct list_head list;
 214         struct nvm_tgt_dev *dev;
 215         struct nvm_tgt_type *type;
 216         struct gendisk *disk;
 217 };
 218
 219 #define ADDR_EMPTY (~0ULL)
 220
 221 #define NVM_TARGET_DEFAULT_OP (101)
 222 #define NVM_TARGET_MIN_OP (3)
 223 #define NVM_TARGET_MAX_OP (80)
 224
 225 #define NVM_VERSION_MAJOR 1
 226 #define NVM_VERSION_MINOR 0
 227 #define NVM_VERSION_PATCH 0
 228
 229 struct nvm_rq;
 230 typedef void (nvm_end_io_fn)(struct nvm_rq *);
 231
 232 struct nvm_rq {
 233         struct nvm_tgt_dev *dev;
 234
 235         struct bio *bio;
 236
 237         union {
 238                 struct ppa_addr ppa_addr;
 239                 dma_addr_t dma_ppa_list;
 240         };
 241
 242         struct ppa_addr *ppa_list;
 243
 244         void *meta_list;
 245         dma_addr_t dma_meta_list;
 246
 247         nvm_end_io_fn *end_io;
 248
 249         uint8_t opcode;
 250         uint16_t nr_ppas;
 251         uint16_t flags;
 252
 253         u64 ppa_status; /* ppa media status */
 254         int error;
 255
 256         void *private;
 257 };
 258
 259 static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
 260 {
 261         return pdu - sizeof(struct nvm_rq);
 262 }
 263
 264 static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
 265 {
 266         return rqdata + 1;
 267 }
 268
 269 enum {
 270         NVM_BLK_ST_FREE =       0x1,    /* Free block */
 271         NVM_BLK_ST_TGT =        0x2,    /* Block in use by target */
 272         NVM_BLK_ST_BAD =        0x8,    /* Bad block */
 273 };
 274
 275
 276 /* Device generic information */
 277 struct nvm_geo {
 278         /* generic geometry */
 279         int nr_chnls;
 280         int all_luns; /* across channels */
 281         int nr_luns; /* per channel */
 282         int nr_chks; /* per lun */
 283
 284         int sec_size;
 285         int oob_size;
 286         int mccap;
 287
 288         int sec_per_chk;
 289         int sec_per_lun;
 290
 291         int ws_min;
 292         int ws_opt;
 293         int ws_seq;
 294         int ws_per_chk;
 295
 296         int max_rq_size;
 297
 298         int op;
 299
 300         struct nvm_addr_format ppaf;
 301
 302         /* Legacy 1.2 specific geometry */
 303         int plane_mode; /* drive device in single, double or quad mode */
 304         int nr_planes;
 305         int sec_per_pg; /* only sectors for a single page */
 306         int sec_per_pl; /* all sectors across planes */
 307 };
 308
 309 /* sub-device structure */
 310 struct nvm_tgt_dev {
 311         /* Device information */
 312         struct nvm_geo geo;
 313
 314         /* Base ppas for target LUNs */
 315         struct ppa_addr *luns;
 316
 317         sector_t total_secs;
 318
 319         struct nvm_id identity;
 320         struct request_queue *q;
 321
 322         struct nvm_dev *parent;
 323         void *map;
 324 };
 325
 326 struct nvm_dev {
 327         struct nvm_dev_ops *ops;
 328
 329         struct list_head devices;
 330
 331         /* Device information */
 332         struct nvm_geo geo;
 333
 334         unsigned long total_secs;
 335
 336         unsigned long *lun_map;
 337         void *dma_pool;
 338
 339         struct nvm_id identity;
 340
 341         /* Backend device */
 342         struct request_queue *q;
 343         char name[DISK_NAME_LEN];
 344         void *private_data;
 345
 346         void *rmap;
 347
 348         struct mutex mlock;
 349         spinlock_t lock;
 350
 351         /* target management */
 352         struct list_head area_list;
 353         struct list_head targets;
 354 };
 355
 356 static inline struct ppa_addr generic_to_dev_addr(struct nvm_tgt_dev *tgt_dev,
 357                                                   struct ppa_addr r)
 358 {
 359         struct nvm_geo *geo = &tgt_dev->geo;
 360         struct ppa_addr l;
 361
 362         l.ppa = ((u64)r.g.blk) << geo->ppaf.blk_offset;
 363         l.ppa |= ((u64)r.g.pg) << geo->ppaf.pg_offset;
 364         l.ppa |= ((u64)r.g.sec) << geo->ppaf.sect_offset;
 365         l.ppa |= ((u64)r.g.pl) << geo->ppaf.pln_offset;
 366         l.ppa |= ((u64)r.g.lun) << geo->ppaf.lun_offset;
 367         l.ppa |= ((u64)r.g.ch) << geo->ppaf.ch_offset;
 368
 369         return l;
 370 }
 371
 372 static inline struct ppa_addr dev_to_generic_addr(struct nvm_tgt_dev *tgt_dev,
 373                                                   struct ppa_addr r)
 374 {
 375         struct nvm_geo *geo = &tgt_dev->geo;
 376         struct ppa_addr l;
 377
 378         l.ppa = 0;
 379         /*
 380          * (r.ppa << X offset) & X len bitmask. X eq. blk, pg, etc.
 381          */
 382         l.g.blk = (r.ppa >> geo->ppaf.blk_offset) &
 383                                         (((1 << geo->ppaf.blk_len) - 1));
 384         l.g.pg |= (r.ppa >> geo->ppaf.pg_offset) &
 385                                         (((1 << geo->ppaf.pg_len) - 1));
 386         l.g.sec |= (r.ppa >> geo->ppaf.sect_offset) &
 387                                         (((1 << geo->ppaf.sect_len) - 1));
 388         l.g.pl |= (r.ppa >> geo->ppaf.pln_offset) &
 389                                         (((1 << geo->ppaf.pln_len) - 1));
 390         l.g.lun |= (r.ppa >> geo->ppaf.lun_offset) &
 391                                         (((1 << geo->ppaf.lun_len) - 1));
 392         l.g.ch |= (r.ppa >> geo->ppaf.ch_offset) &
 393                                         (((1 << geo->ppaf.ch_len) - 1));
 394
 395         return l;
 396 }
 397
 398 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 399 typedef sector_t (nvm_tgt_capacity_fn)(void *);
 400 typedef void *(nvm_tgt_init_fn)(struct nvm_tgt_dev *, struct gendisk *,
 401                                 int flags);
 402 typedef void (nvm_tgt_exit_fn)(void *);
 403 typedef int (nvm_tgt_sysfs_init_fn)(struct gendisk *);
 404 typedef void (nvm_tgt_sysfs_exit_fn)(struct gendisk *);
 405
 406 struct nvm_tgt_type {
 407         const char *name;
 408         unsigned int version[3];
 409
 410         /* target entry points */
 411         nvm_tgt_make_rq_fn *make_rq;
 412         nvm_tgt_capacity_fn *capacity;
 413
 414         /* module-specific init/teardown */
 415         nvm_tgt_init_fn *init;
 416         nvm_tgt_exit_fn *exit;
 417
 418         /* sysfs */
 419         nvm_tgt_sysfs_init_fn *sysfs_init;
 420         nvm_tgt_sysfs_exit_fn *sysfs_exit;
 421
 422         /* For internal use */
 423         struct list_head list;
 424         struct module *owner;
 425 };
 426
 427 extern int nvm_register_tgt_type(struct nvm_tgt_type *);
 428 extern void nvm_unregister_tgt_type(struct nvm_tgt_type *);
 429
 430 extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
 431 extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
 432
 433 extern struct nvm_dev *nvm_alloc_dev(int);
 434 extern int nvm_register(struct nvm_dev *);
 435 extern void nvm_unregister(struct nvm_dev *);
 436
 437 extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *,
 438                               int, int);
 439 extern int nvm_max_phys_sects(struct nvm_tgt_dev *);
 440 extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *);
 441 extern int nvm_submit_io_sync(struct nvm_tgt_dev *, struct nvm_rq *);
 442 extern void nvm_end_io(struct nvm_rq *);
 443 extern int nvm_bb_tbl_fold(struct nvm_dev *, u8 *, int);
 444 extern int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr, u8 *);
 445
 446 #else /* CONFIG_NVM */
 447 struct nvm_dev_ops;
 448
 449 static inline struct nvm_dev *nvm_alloc_dev(int node)
 450 {
 451         return ERR_PTR(-EINVAL);
 452 }
 453 static inline int nvm_register(struct nvm_dev *dev)
 454 {
 455         return -EINVAL;
 456 }
 457 static inline void nvm_unregister(struct nvm_dev *dev) {}
 458 #endif /* CONFIG_NVM */
 459 #endif /* LIGHTNVM.H */