drivers/lightnvm/core.c

   1 /*
   2  * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
   3  * Initial release: Matias Bjorling <m@bjorling.me>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License version
   7  * 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; see the file COPYING.  If not, write to
  16  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
  17  * USA.
  18  *
  19  */
  20
  21 #include <linux/list.h>
  22 #include <linux/types.h>
  23 #include <linux/sem.h>
  24 #include <linux/bitmap.h>
  25 #include <linux/module.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/lightnvm.h>
  28 #include <linux/sched/sysctl.h>
  29
  30 static LIST_HEAD(nvm_tgt_types);
  31 static DECLARE_RWSEM(nvm_tgtt_lock);
  32 static LIST_HEAD(nvm_mgrs);
  33 static LIST_HEAD(nvm_devices);
  34 static DECLARE_RWSEM(nvm_lock);
  35
  36 struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
  37 {
  38         struct nvm_tgt_type *tmp, *tt = NULL;
  39
  40         if (lock)
  41                 down_write(&nvm_tgtt_lock);
  42
  43         list_for_each_entry(tmp, &nvm_tgt_types, list)
  44                 if (!strcmp(name, tmp->name)) {
  45                         tt = tmp;
  46                         break;
  47                 }
  48
  49         if (lock)
  50                 up_write(&nvm_tgtt_lock);
  51         return tt;
  52 }
  53 EXPORT_SYMBOL(nvm_find_target_type);
  54
  55 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
  56 {
  57         int ret = 0;
  58
  59         down_write(&nvm_tgtt_lock);
  60         if (nvm_find_target_type(tt->name, 0))
  61                 ret = -EEXIST;
  62         else
  63                 list_add(&tt->list, &nvm_tgt_types);
  64         up_write(&nvm_tgtt_lock);
  65
  66         return ret;
  67 }
  68 EXPORT_SYMBOL(nvm_register_tgt_type);
  69
  70 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
  71 {
  72         if (!tt)
  73                 return;
  74
  75         down_write(&nvm_lock);
  76         list_del(&tt->list);
  77         up_write(&nvm_lock);
  78 }
  79 EXPORT_SYMBOL(nvm_unregister_tgt_type);
  80
  81 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
  82                                                         dma_addr_t *dma_handler)
  83 {
  84         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
  85                                                                 dma_handler);
  86 }
  87 EXPORT_SYMBOL(nvm_dev_dma_alloc);
  88
  89 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr,
  90                                                         dma_addr_t dma_handler)
  91 {
  92         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
  93 }
  94 EXPORT_SYMBOL(nvm_dev_dma_free);
  95
  96 static struct nvmm_type *nvm_find_mgr_type(const char *name)
  97 {
  98         struct nvmm_type *mt;
  99
 100         list_for_each_entry(mt, &nvm_mgrs, list)
 101                 if (!strcmp(name, mt->name))
 102                         return mt;
 103
 104         return NULL;
 105 }
 106
 107 static struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev)
 108 {
 109         struct nvmm_type *mt;
 110         int ret;
 111
 112         lockdep_assert_held(&nvm_lock);
 113
 114         list_for_each_entry(mt, &nvm_mgrs, list) {
 115                 if (strncmp(dev->sb.mmtype, mt->name, NVM_MMTYPE_LEN))
 116                         continue;
 117
 118                 ret = mt->register_mgr(dev);
 119                 if (ret < 0) {
 120                         pr_err("nvm: media mgr failed to init (%d) on dev %s\n",
 121                                                                 ret, dev->name);
 122                         return NULL; /* initialization failed */
 123                 } else if (ret > 0)
 124                         return mt;
 125         }
 126
 127         return NULL;
 128 }
 129
 130 int nvm_register_mgr(struct nvmm_type *mt)
 131 {
 132         struct nvm_dev *dev;
 133         int ret = 0;
 134
 135         down_write(&nvm_lock);
 136         if (nvm_find_mgr_type(mt->name)) {
 137                 ret = -EEXIST;
 138                 goto finish;
 139         } else {
 140                 list_add(&mt->list, &nvm_mgrs);
 141         }
 142
 143         /* try to register media mgr if any device have none configured */
 144         list_for_each_entry(dev, &nvm_devices, devices) {
 145                 if (dev->mt)
 146                         continue;
 147
 148                 dev->mt = nvm_init_mgr(dev);
 149         }
 150 finish:
 151         up_write(&nvm_lock);
 152
 153         return ret;
 154 }
 155 EXPORT_SYMBOL(nvm_register_mgr);
 156
 157 void nvm_unregister_mgr(struct nvmm_type *mt)
 158 {
 159         if (!mt)
 160                 return;
 161
 162         down_write(&nvm_lock);
 163         list_del(&mt->list);
 164         up_write(&nvm_lock);
 165 }
 166 EXPORT_SYMBOL(nvm_unregister_mgr);
 167
 168 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 169 {
 170         struct nvm_dev *dev;
 171
 172         list_for_each_entry(dev, &nvm_devices, devices)
 173                 if (!strcmp(name, dev->name))
 174                         return dev;
 175
 176         return NULL;
 177 }
 178
 179 struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun,
 180                                                         unsigned long flags)
 181 {
 182         return dev->mt->get_blk(dev, lun, flags);
 183 }
 184 EXPORT_SYMBOL(nvm_get_blk);
 185
 186 /* Assumes that all valid pages have already been moved on release to bm */
 187 void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
 188 {
 189         return dev->mt->put_blk(dev, blk);
 190 }
 191 EXPORT_SYMBOL(nvm_put_blk);
 192
 193 void nvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
 194 {
 195         return dev->mt->mark_blk(dev, ppa, type);
 196 }
 197 EXPORT_SYMBOL(nvm_mark_blk);
 198
 199 int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
 200 {
 201         return dev->mt->submit_io(dev, rqd);
 202 }
 203 EXPORT_SYMBOL(nvm_submit_io);
 204
 205 int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
 206 {
 207         return dev->mt->erase_blk(dev, blk, 0);
 208 }
 209 EXPORT_SYMBOL(nvm_erase_blk);
 210
 211 void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 212 {
 213         int i;
 214
 215         if (rqd->nr_ppas > 1) {
 216                 for (i = 0; i < rqd->nr_ppas; i++)
 217                         rqd->ppa_list[i] = dev_to_generic_addr(dev,
 218                                                         rqd->ppa_list[i]);
 219         } else {
 220                 rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr);
 221         }
 222 }
 223 EXPORT_SYMBOL(nvm_addr_to_generic_mode);
 224
 225 void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 226 {
 227         int i;
 228
 229         if (rqd->nr_ppas > 1) {
 230                 for (i = 0; i < rqd->nr_ppas; i++)
 231                         rqd->ppa_list[i] = generic_to_dev_addr(dev,
 232                                                         rqd->ppa_list[i]);
 233         } else {
 234                 rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
 235         }
 236 }
 237 EXPORT_SYMBOL(nvm_generic_to_addr_mode);
 238
 239 int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
 240                         const struct ppa_addr *ppas, int nr_ppas, int vblk)
 241 {
 242         int i, plane_cnt, pl_idx;
 243         struct ppa_addr ppa;
 244
 245         if ((!vblk || dev->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) {
 246                 rqd->nr_ppas = nr_ppas;
 247                 rqd->ppa_addr = ppas[0];
 248
 249                 return 0;
 250         }
 251
 252         rqd->nr_ppas = nr_ppas;
 253         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 254         if (!rqd->ppa_list) {
 255                 pr_err("nvm: failed to allocate dma memory\n");
 256                 return -ENOMEM;
 257         }
 258
 259         if (!vblk) {
 260                 for (i = 0; i < nr_ppas; i++)
 261                         rqd->ppa_list[i] = ppas[i];
 262         } else {
 263                 plane_cnt = dev->plane_mode;
 264                 rqd->nr_ppas *= plane_cnt;
 265
 266                 for (i = 0; i < nr_ppas; i++) {
 267                         for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 268                                 ppa = ppas[i];
 269                                 ppa.g.pl = pl_idx;
 270                                 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 271                         }
 272                 }
 273         }
 274
 275         return 0;
 276 }
 277 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
 278
 279 void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
 280 {
 281         if (!rqd->ppa_list)
 282                 return;
 283
 284         nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
 285 }
 286 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
 287
 288 int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas)
 289 {
 290         struct nvm_rq rqd;
 291         int ret;
 292
 293         if (!dev->ops->erase_block)
 294                 return 0;
 295
 296         memset(&rqd, 0, sizeof(struct nvm_rq));
 297
 298         ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas, 1);
 299         if (ret)
 300                 return ret;
 301
 302         nvm_generic_to_addr_mode(dev, &rqd);
 303
 304         ret = dev->ops->erase_block(dev, &rqd);
 305
 306         nvm_free_rqd_ppalist(dev, &rqd);
 307
 308         return ret;
 309 }
 310 EXPORT_SYMBOL(nvm_erase_ppa);
 311
 312 void nvm_end_io(struct nvm_rq *rqd, int error)
 313 {
 314         rqd->error = error;
 315         rqd->end_io(rqd);
 316 }
 317 EXPORT_SYMBOL(nvm_end_io);
 318
 319 static void nvm_end_io_sync(struct nvm_rq *rqd)
 320 {
 321         struct completion *waiting = rqd->wait;
 322
 323         rqd->wait = NULL;
 324
 325         complete(waiting);
 326 }
 327
 328 static int __nvm_submit_ppa(struct nvm_dev *dev, struct nvm_rq *rqd, int opcode,
 329                                                 int flags, void *buf, int len)
 330 {
 331         DECLARE_COMPLETION_ONSTACK(wait);
 332         struct bio *bio;
 333         int ret;
 334         unsigned long hang_check;
 335
 336         bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL);
 337         if (IS_ERR_OR_NULL(bio))
 338                 return -ENOMEM;
 339
 340         nvm_generic_to_addr_mode(dev, rqd);
 341
 342         rqd->dev = dev;
 343         rqd->opcode = opcode;
 344         rqd->flags = flags;
 345         rqd->bio = bio;
 346         rqd->wait = &wait;
 347         rqd->end_io = nvm_end_io_sync;
 348
 349         ret = dev->ops->submit_io(dev, rqd);
 350         if (ret) {
 351                 bio_put(bio);
 352                 return ret;
 353         }
 354
 355         /* Prevent hang_check timer from firing at us during very long I/O */
 356         hang_check = sysctl_hung_task_timeout_secs;
 357         if (hang_check)
 358                 while (!wait_for_completion_io_timeout(&wait,
 359                                                         hang_check * (HZ/2)))
 360                         ;
 361         else
 362                 wait_for_completion_io(&wait);
 363
 364         return rqd->error;
 365 }
 366
 367 /**
 368  * nvm_submit_ppa_list - submit user-defined ppa list to device. The user must
 369  *                       take to free ppa list if necessary.
 370  * @dev:        device
 371  * @ppa_list:   user created ppa_list
 372  * @nr_ppas:    length of ppa_list
 373  * @opcode:     device opcode
 374  * @flags:      device flags
 375  * @buf:        data buffer
 376  * @len:        data buffer length
 377  */
 378 int nvm_submit_ppa_list(struct nvm_dev *dev, struct ppa_addr *ppa_list,
 379                         int nr_ppas, int opcode, int flags, void *buf, int len)
 380 {
 381         struct nvm_rq rqd;
 382
 383         if (dev->ops->max_phys_sect < nr_ppas)
 384                 return -EINVAL;
 385
 386         memset(&rqd, 0, sizeof(struct nvm_rq));
 387
 388         rqd.nr_ppas = nr_ppas;
 389         if (nr_ppas > 1)
 390                 rqd.ppa_list = ppa_list;
 391         else
 392                 rqd.ppa_addr = ppa_list[0];
 393
 394         return __nvm_submit_ppa(dev, &rqd, opcode, flags, buf, len);
 395 }
 396 EXPORT_SYMBOL(nvm_submit_ppa_list);
 397
 398 /**
 399  * nvm_submit_ppa - submit PPAs to device. PPAs will automatically be unfolded
 400  *                  as single, dual, quad plane PPAs depending on device type.
 401  * @dev:        device
 402  * @ppa:        user created ppa_list
 403  * @nr_ppas:    length of ppa_list
 404  * @opcode:     device opcode
 405  * @flags:      device flags
 406  * @buf:        data buffer
 407  * @len:        data buffer length
 408  */
 409 int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas,
 410                                 int opcode, int flags, void *buf, int len)
 411 {
 412         struct nvm_rq rqd;
 413         int ret;
 414
 415         memset(&rqd, 0, sizeof(struct nvm_rq));
 416         ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas, 1);
 417         if (ret)
 418                 return ret;
 419
 420         ret = __nvm_submit_ppa(dev, &rqd, opcode, flags, buf, len);
 421
 422         nvm_free_rqd_ppalist(dev, &rqd);
 423
 424         return ret;
 425 }
 426 EXPORT_SYMBOL(nvm_submit_ppa);
 427
 428 /*
 429  * folds a bad block list from its plane representation to its virtual
 430  * block representation. The fold is done in place and reduced size is
 431  * returned.
 432  *
 433  * If any of the planes status are bad or grown bad block, the virtual block
 434  * is marked bad. If not bad, the first plane state acts as the block state.
 435  */
 436 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 437 {
 438         int blk, offset, pl, blktype;
 439
 440         if (nr_blks != dev->blks_per_lun * dev->plane_mode)
 441                 return -EINVAL;
 442
 443         for (blk = 0; blk < dev->blks_per_lun; blk++) {
 444                 offset = blk * dev->plane_mode;
 445                 blktype = blks[offset];
 446
 447                 /* Bad blocks on any planes take precedence over other types */
 448                 for (pl = 0; pl < dev->plane_mode; pl++) {
 449                         if (blks[offset + pl] &
 450                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 451                                 blktype = blks[offset + pl];
 452                                 break;
 453                         }
 454                 }
 455
 456                 blks[blk] = blktype;
 457         }
 458
 459         return dev->blks_per_lun;
 460 }
 461 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 462
 463 int nvm_get_bb_tbl(struct nvm_dev *dev, struct ppa_addr ppa, u8 *blks)
 464 {
 465         ppa = generic_to_dev_addr(dev, ppa);
 466
 467         return dev->ops->get_bb_tbl(dev, ppa, blks);
 468 }
 469 EXPORT_SYMBOL(nvm_get_bb_tbl);
 470
 471 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 472 {
 473         int i;
 474
 475         dev->lps_per_blk = dev->pgs_per_blk;
 476         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 477         if (!dev->lptbl)
 478                 return -ENOMEM;
 479
 480         /* Just a linear array */
 481         for (i = 0; i < dev->lps_per_blk; i++)
 482                 dev->lptbl[i] = i;
 483
 484         return 0;
 485 }
 486
 487 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 488 {
 489         int i, p;
 490         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 491
 492         if (!mlc->num_pairs)
 493                 return 0;
 494
 495         dev->lps_per_blk = mlc->num_pairs;
 496         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 497         if (!dev->lptbl)
 498                 return -ENOMEM;
 499
 500         /* The lower page table encoding consists of a list of bytes, where each
 501          * has a lower and an upper half. The first half byte maintains the
 502          * increment value and every value after is an offset added to the
 503          * previous incrementation value
 504          */
 505         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 506         for (i = 1; i < dev->lps_per_blk; i++) {
 507                 p = mlc->pairs[i >> 1];
 508                 if (i & 0x1) /* upper */
 509                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 510                 else /* lower */
 511                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 512         }
 513
 514         return 0;
 515 }
 516
 517 static int nvm_core_init(struct nvm_dev *dev)
 518 {
 519         struct nvm_id *id = &dev->identity;
 520         struct nvm_id_group *grp = &id->groups[0];
 521         int ret;
 522
 523         /* device values */
 524         dev->nr_chnls = grp->num_ch;
 525         dev->luns_per_chnl = grp->num_lun;
 526         dev->pgs_per_blk = grp->num_pg;
 527         dev->blks_per_lun = grp->num_blk;
 528         dev->nr_planes = grp->num_pln;
 529         dev->fpg_size = grp->fpg_sz;
 530         dev->pfpg_size = grp->fpg_sz * grp->num_pln;
 531         dev->sec_size = grp->csecs;
 532         dev->oob_size = grp->sos;
 533         dev->sec_per_pg = grp->fpg_sz / grp->csecs;
 534         dev->mccap = grp->mccap;
 535         memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 536
 537         dev->plane_mode = NVM_PLANE_SINGLE;
 538         dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
 539
 540         if (grp->mpos & 0x020202)
 541                 dev->plane_mode = NVM_PLANE_DOUBLE;
 542         if (grp->mpos & 0x040404)
 543                 dev->plane_mode = NVM_PLANE_QUAD;
 544
 545         if (grp->mtype != 0) {
 546                 pr_err("nvm: memory type not supported\n");
 547                 return -EINVAL;
 548         }
 549
 550         /* calculated values */
 551         dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
 552         dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
 553         dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
 554         dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
 555
 556         dev->total_secs = dev->nr_luns * dev->sec_per_lun;
 557         dev->lun_map = kcalloc(BITS_TO_LONGS(dev->nr_luns),
 558                                         sizeof(unsigned long), GFP_KERNEL);
 559         if (!dev->lun_map)
 560                 return -ENOMEM;
 561
 562         switch (grp->fmtype) {
 563         case NVM_ID_FMTYPE_SLC:
 564                 if (nvm_init_slc_tbl(dev, grp)) {
 565                         ret = -ENOMEM;
 566                         goto err_fmtype;
 567                 }
 568                 break;
 569         case NVM_ID_FMTYPE_MLC:
 570                 if (nvm_init_mlc_tbl(dev, grp)) {
 571                         ret = -ENOMEM;
 572                         goto err_fmtype;
 573                 }
 574                 break;
 575         default:
 576                 pr_err("nvm: flash type not supported\n");
 577                 ret = -EINVAL;
 578                 goto err_fmtype;
 579         }
 580
 581         mutex_init(&dev->mlock);
 582         spin_lock_init(&dev->lock);
 583
 584         blk_queue_logical_block_size(dev->q, dev->sec_size);
 585
 586         return 0;
 587 err_fmtype:
 588         kfree(dev->lun_map);
 589         return ret;
 590 }
 591
 592 static void nvm_free_mgr(struct nvm_dev *dev)
 593 {
 594         if (!dev->mt)
 595                 return;
 596
 597         dev->mt->unregister_mgr(dev);
 598         dev->mt = NULL;
 599 }
 600
 601 static void nvm_free(struct nvm_dev *dev)
 602 {
 603         if (!dev)
 604                 return;
 605
 606         nvm_free_mgr(dev);
 607
 608         kfree(dev->lptbl);
 609         kfree(dev->lun_map);
 610 }
 611
 612 static int nvm_init(struct nvm_dev *dev)
 613 {
 614         int ret = -EINVAL;
 615
 616         if (!dev->q || !dev->ops)
 617                 return ret;
 618
 619         if (dev->ops->identity(dev, &dev->identity)) {
 620                 pr_err("nvm: device could not be identified\n");
 621                 goto err;
 622         }
 623
 624         pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
 625                         dev->identity.ver_id, dev->identity.vmnt,
 626                                                         dev->identity.cgrps);
 627
 628         if (dev->identity.ver_id != 1) {
 629                 pr_err("nvm: device not supported by kernel.");
 630                 goto err;
 631         }
 632
 633         if (dev->identity.cgrps != 1) {
 634                 pr_err("nvm: only one group configuration supported.");
 635                 goto err;
 636         }
 637
 638         ret = nvm_core_init(dev);
 639         if (ret) {
 640                 pr_err("nvm: could not initialize core structures.\n");
 641                 goto err;
 642         }
 643
 644         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
 645                         dev->name, dev->sec_per_pg, dev->nr_planes,
 646                         dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
 647                         dev->nr_chnls);
 648         return 0;
 649 err:
 650         pr_err("nvm: failed to initialize nvm\n");
 651         return ret;
 652 }
 653
 654 static void nvm_exit(struct nvm_dev *dev)
 655 {
 656         if (dev->dma_pool)
 657                 dev->ops->destroy_dma_pool(dev->dma_pool);
 658         nvm_free(dev);
 659
 660         pr_info("nvm: successfully unloaded\n");
 661 }
 662
 663 struct nvm_dev *nvm_alloc_dev(int node)
 664 {
 665         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
 666 }
 667 EXPORT_SYMBOL(nvm_alloc_dev);
 668
 669 int nvm_register(struct nvm_dev *dev)
 670 {
 671         int ret;
 672
 673         ret = nvm_init(dev);
 674         if (ret)
 675                 goto err_init;
 676
 677         if (dev->ops->max_phys_sect > 256) {
 678                 pr_info("nvm: max sectors supported is 256.\n");
 679                 ret = -EINVAL;
 680                 goto err_init;
 681         }
 682
 683         if (dev->ops->max_phys_sect > 1) {
 684                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
 685                 if (!dev->dma_pool) {
 686                         pr_err("nvm: could not create dma pool\n");
 687                         ret = -ENOMEM;
 688                         goto err_init;
 689                 }
 690         }
 691
 692         if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
 693                 ret = nvm_get_sysblock(dev, &dev->sb);
 694                 if (!ret)
 695                         pr_err("nvm: device not initialized.\n");
 696                 else if (ret < 0)
 697                         pr_err("nvm: err (%d) on device initialization\n", ret);
 698         }
 699
 700         /* register device with a supported media manager */
 701         down_write(&nvm_lock);
 702         if (ret > 0)
 703                 dev->mt = nvm_init_mgr(dev);
 704         list_add(&dev->devices, &nvm_devices);
 705         up_write(&nvm_lock);
 706
 707         return 0;
 708 err_init:
 709         kfree(dev->lun_map);
 710         return ret;
 711 }
 712 EXPORT_SYMBOL(nvm_register);
 713
 714 void nvm_unregister(struct nvm_dev *dev)
 715 {
 716         down_write(&nvm_lock);
 717         list_del(&dev->devices);
 718         up_write(&nvm_lock);
 719
 720         nvm_exit(dev);
 721 }
 722 EXPORT_SYMBOL(nvm_unregister);
 723
 724 static int __nvm_configure_create(struct nvm_ioctl_create *create)
 725 {
 726         struct nvm_dev *dev;
 727         struct nvm_ioctl_create_simple *s;
 728
 729         down_write(&nvm_lock);
 730         dev = nvm_find_nvm_dev(create->dev);
 731         up_write(&nvm_lock);
 732
 733         if (!dev) {
 734                 pr_err("nvm: device not found\n");
 735                 return -EINVAL;
 736         }
 737
 738         if (!dev->mt) {
 739                 pr_info("nvm: device has no media manager registered.\n");
 740                 return -ENODEV;
 741         }
 742
 743         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
 744                 pr_err("nvm: config type not valid\n");
 745                 return -EINVAL;
 746         }
 747         s = &create->conf.s;
 748
 749         if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
 750                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
 751                         s->lun_begin, s->lun_end, dev->nr_luns);
 752                 return -EINVAL;
 753         }
 754
 755         return dev->mt->create_tgt(dev, create);
 756 }
 757
 758 #ifdef CONFIG_NVM_DEBUG
 759 static int nvm_configure_show(const char *val)
 760 {
 761         struct nvm_dev *dev;
 762         char opcode, devname[DISK_NAME_LEN];
 763         int ret;
 764
 765         ret = sscanf(val, "%c %32s", &opcode, devname);
 766         if (ret != 2) {
 767                 pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
 768                 return -EINVAL;
 769         }
 770
 771         down_write(&nvm_lock);
 772         dev = nvm_find_nvm_dev(devname);
 773         up_write(&nvm_lock);
 774         if (!dev) {
 775                 pr_err("nvm: device not found\n");
 776                 return -EINVAL;
 777         }
 778
 779         if (!dev->mt)
 780                 return 0;
 781
 782         dev->mt->lun_info_print(dev);
 783
 784         return 0;
 785 }
 786
 787 static int nvm_configure_remove(const char *val)
 788 {
 789         struct nvm_ioctl_remove remove;
 790         struct nvm_dev *dev;
 791         char opcode;
 792         int ret = 0;
 793
 794         ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
 795         if (ret != 2) {
 796                 pr_err("nvm: invalid command. Use \"d targetname\".\n");
 797                 return -EINVAL;
 798         }
 799
 800         remove.flags = 0;
 801
 802         list_for_each_entry(dev, &nvm_devices, devices) {
 803                 ret = dev->mt->remove_tgt(dev, &remove);
 804                 if (!ret)
 805                         break;
 806         }
 807
 808         return ret;
 809 }
 810
 811 static int nvm_configure_create(const char *val)
 812 {
 813         struct nvm_ioctl_create create;
 814         char opcode;
 815         int lun_begin, lun_end, ret;
 816
 817         ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
 818                                                 create.tgtname, create.tgttype,
 819                                                 &lun_begin, &lun_end);
 820         if (ret != 6) {
 821                 pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
 822                 return -EINVAL;
 823         }
 824
 825         create.flags = 0;
 826         create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
 827         create.conf.s.lun_begin = lun_begin;
 828         create.conf.s.lun_end = lun_end;
 829
 830         return __nvm_configure_create(&create);
 831 }
 832
 833
 834 /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
 835 static int nvm_configure_by_str_event(const char *val,
 836                                         const struct kernel_param *kp)
 837 {
 838         char opcode;
 839         int ret;
 840
 841         ret = sscanf(val, "%c", &opcode);
 842         if (ret != 1) {
 843                 pr_err("nvm: string must have the format of \"cmd ...\"\n");
 844                 return -EINVAL;
 845         }
 846
 847         switch (opcode) {
 848         case 'a':
 849                 return nvm_configure_create(val);
 850         case 'd':
 851                 return nvm_configure_remove(val);
 852         case 's':
 853                 return nvm_configure_show(val);
 854         default:
 855                 pr_err("nvm: invalid command\n");
 856                 return -EINVAL;
 857         }
 858
 859         return 0;
 860 }
 861
 862 static int nvm_configure_get(char *buf, const struct kernel_param *kp)
 863 {
 864         int sz;
 865         struct nvm_dev *dev;
 866
 867         sz = sprintf(buf, "available devices:\n");
 868         down_write(&nvm_lock);
 869         list_for_each_entry(dev, &nvm_devices, devices) {
 870                 if (sz > 4095 - DISK_NAME_LEN - 2)
 871                         break;
 872                 sz += sprintf(buf + sz, " %32s\n", dev->name);
 873         }
 874         up_write(&nvm_lock);
 875
 876         return sz;
 877 }
 878
 879 static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
 880         .set    = nvm_configure_by_str_event,
 881         .get    = nvm_configure_get,
 882 };
 883
 884 #undef MODULE_PARAM_PREFIX
 885 #define MODULE_PARAM_PREFIX     "lnvm."
 886
 887 module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
 888                                                                         0644);
 889
 890 #endif /* CONFIG_NVM_DEBUG */
 891
 892 static long nvm_ioctl_info(struct file *file, void __user *arg)
 893 {
 894         struct nvm_ioctl_info *info;
 895         struct nvm_tgt_type *tt;
 896         int tgt_iter = 0;
 897
 898         if (!capable(CAP_SYS_ADMIN))
 899                 return -EPERM;
 900
 901         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
 902         if (IS_ERR(info))
 903                 return -EFAULT;
 904
 905         info->version[0] = NVM_VERSION_MAJOR;
 906         info->version[1] = NVM_VERSION_MINOR;
 907         info->version[2] = NVM_VERSION_PATCH;
 908
 909         down_write(&nvm_lock);
 910         list_for_each_entry(tt, &nvm_tgt_types, list) {
 911                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
 912
 913                 tgt->version[0] = tt->version[0];
 914                 tgt->version[1] = tt->version[1];
 915                 tgt->version[2] = tt->version[2];
 916                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
 917
 918                 tgt_iter++;
 919         }
 920
 921         info->tgtsize = tgt_iter;
 922         up_write(&nvm_lock);
 923
 924         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
 925                 kfree(info);
 926                 return -EFAULT;
 927         }
 928
 929         kfree(info);
 930         return 0;
 931 }
 932
 933 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
 934 {
 935         struct nvm_ioctl_get_devices *devices;
 936         struct nvm_dev *dev;
 937         int i = 0;
 938
 939         if (!capable(CAP_SYS_ADMIN))
 940                 return -EPERM;
 941
 942         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
 943         if (!devices)
 944                 return -ENOMEM;
 945
 946         down_write(&nvm_lock);
 947         list_for_each_entry(dev, &nvm_devices, devices) {
 948                 struct nvm_ioctl_device_info *info = &devices->info[i];
 949
 950                 sprintf(info->devname, "%s", dev->name);
 951                 if (dev->mt) {
 952                         info->bmversion[0] = dev->mt->version[0];
 953                         info->bmversion[1] = dev->mt->version[1];
 954                         info->bmversion[2] = dev->mt->version[2];
 955                         sprintf(info->bmname, "%s", dev->mt->name);
 956                 } else {
 957                         sprintf(info->bmname, "none");
 958                 }
 959
 960                 i++;
 961                 if (i > 31) {
 962                         pr_err("nvm: max 31 devices can be reported.\n");
 963                         break;
 964                 }
 965         }
 966         up_write(&nvm_lock);
 967
 968         devices->nr_devices = i;
 969
 970         if (copy_to_user(arg, devices,
 971                          sizeof(struct nvm_ioctl_get_devices))) {
 972                 kfree(devices);
 973                 return -EFAULT;
 974         }
 975
 976         kfree(devices);
 977         return 0;
 978 }
 979
 980 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
 981 {
 982         struct nvm_ioctl_create create;
 983
 984         if (!capable(CAP_SYS_ADMIN))
 985                 return -EPERM;
 986
 987         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
 988                 return -EFAULT;
 989
 990         create.dev[DISK_NAME_LEN - 1] = '\0';
 991         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
 992         create.tgtname[DISK_NAME_LEN - 1] = '\0';
 993
 994         if (create.flags != 0) {
 995                 pr_err("nvm: no flags supported\n");
 996                 return -EINVAL;
 997         }
 998
 999         return __nvm_configure_create(&create);
1000 }
1001
1002 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1003 {
1004         struct nvm_ioctl_remove remove;
1005         struct nvm_dev *dev;
1006         int ret = 0;
1007
1008         if (!capable(CAP_SYS_ADMIN))
1009                 return -EPERM;
1010
1011         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1012                 return -EFAULT;
1013
1014         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1015
1016         if (remove.flags != 0) {
1017                 pr_err("nvm: no flags supported\n");
1018                 return -EINVAL;
1019         }
1020
1021         list_for_each_entry(dev, &nvm_devices, devices) {
1022                 ret = dev->mt->remove_tgt(dev, &remove);
1023                 if (!ret)
1024                         break;
1025         }
1026
1027         return ret;
1028 }
1029
1030 static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
1031 {
1032         info->seqnr = 1;
1033         info->erase_cnt = 0;
1034         info->version = 1;
1035 }
1036
1037 static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
1038 {
1039         struct nvm_dev *dev;
1040         struct nvm_sb_info info;
1041         int ret;
1042
1043         down_write(&nvm_lock);
1044         dev = nvm_find_nvm_dev(init->dev);
1045         up_write(&nvm_lock);
1046         if (!dev) {
1047                 pr_err("nvm: device not found\n");
1048                 return -EINVAL;
1049         }
1050
1051         nvm_setup_nvm_sb_info(&info);
1052
1053         strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
1054         info.fs_ppa.ppa = -1;
1055
1056         if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
1057                 ret = nvm_init_sysblock(dev, &info);
1058                 if (ret)
1059                         return ret;
1060         }
1061
1062         memcpy(&dev->sb, &info, sizeof(struct nvm_sb_info));
1063
1064         down_write(&nvm_lock);
1065         dev->mt = nvm_init_mgr(dev);
1066         up_write(&nvm_lock);
1067
1068         return 0;
1069 }
1070
1071 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1072 {
1073         struct nvm_ioctl_dev_init init;
1074
1075         if (!capable(CAP_SYS_ADMIN))
1076                 return -EPERM;
1077
1078         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1079                 return -EFAULT;
1080
1081         if (init.flags != 0) {
1082                 pr_err("nvm: no flags supported\n");
1083                 return -EINVAL;
1084         }
1085
1086         init.dev[DISK_NAME_LEN - 1] = '\0';
1087
1088         return __nvm_ioctl_dev_init(&init);
1089 }
1090
1091 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1092 {
1093         struct nvm_ioctl_dev_factory fact;
1094         struct nvm_dev *dev;
1095
1096         if (!capable(CAP_SYS_ADMIN))
1097                 return -EPERM;
1098
1099         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1100                 return -EFAULT;
1101
1102         fact.dev[DISK_NAME_LEN - 1] = '\0';
1103
1104         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1105                 return -EINVAL;
1106
1107         down_write(&nvm_lock);
1108         dev = nvm_find_nvm_dev(fact.dev);
1109         up_write(&nvm_lock);
1110         if (!dev) {
1111                 pr_err("nvm: device not found\n");
1112                 return -EINVAL;
1113         }
1114
1115         nvm_free_mgr(dev);
1116
1117         if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT)
1118                 return nvm_dev_factory(dev, fact.flags);
1119
1120         return 0;
1121 }
1122
1123 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1124 {
1125         void __user *argp = (void __user *)arg;
1126
1127         switch (cmd) {
1128         case NVM_INFO:
1129                 return nvm_ioctl_info(file, argp);
1130         case NVM_GET_DEVICES:
1131                 return nvm_ioctl_get_devices(file, argp);
1132         case NVM_DEV_CREATE:
1133                 return nvm_ioctl_dev_create(file, argp);
1134         case NVM_DEV_REMOVE:
1135                 return nvm_ioctl_dev_remove(file, argp);
1136         case NVM_DEV_INIT:
1137                 return nvm_ioctl_dev_init(file, argp);
1138         case NVM_DEV_FACTORY:
1139                 return nvm_ioctl_dev_factory(file, argp);
1140         }
1141         return 0;
1142 }
1143
1144 static const struct file_operations _ctl_fops = {
1145         .open = nonseekable_open,
1146         .unlocked_ioctl = nvm_ctl_ioctl,
1147         .owner = THIS_MODULE,
1148         .llseek  = noop_llseek,
1149 };
1150
1151 static struct miscdevice _nvm_misc = {
1152         .minor          = MISC_DYNAMIC_MINOR,
1153         .name           = "lightnvm",
1154         .nodename       = "lightnvm/control",
1155         .fops           = &_ctl_fops,
1156 };
1157
1158 MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
1159
1160 static int __init nvm_mod_init(void)
1161 {
1162         int ret;
1163
1164         ret = misc_register(&_nvm_misc);
1165         if (ret)
1166                 pr_err("nvm: misc_register failed for control device");
1167
1168         return ret;
1169 }
1170
1171 static void __exit nvm_mod_exit(void)
1172 {
1173         misc_deregister(&_nvm_misc);
1174 }
1175
1176 MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
1177 MODULE_LICENSE("GPL v2");
1178 MODULE_VERSION("0.1");
1179 module_init(nvm_mod_init);
1180 module_exit(nvm_mod_exit);