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/moduleparam.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_devices);
  33 static DECLARE_RWSEM(nvm_lock);
  34
  35 /* Map between virtual and physical channel and lun */
  36 struct nvm_ch_map {
  37         int ch_off;
  38         int nr_luns;
  39         int *lun_offs;
  40 };
  41
  42 struct nvm_dev_map {
  43         struct nvm_ch_map *chnls;
  44         int nr_chnls;
  45 };
  46
  47 struct nvm_area {
  48         struct list_head list;
  49         sector_t begin;
  50         sector_t end;   /* end is excluded */
  51 };
  52
  53 static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
  54 {
  55         struct nvm_target *tgt;
  56
  57         list_for_each_entry(tgt, &dev->targets, list)
  58                 if (!strcmp(name, tgt->disk->disk_name))
  59                         return tgt;
  60
  61         return NULL;
  62 }
  63
  64 static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
  65 {
  66         int i;
  67
  68         for (i = lun_begin; i <= lun_end; i++) {
  69                 if (test_and_set_bit(i, dev->lun_map)) {
  70                         pr_err("nvm: lun %d already allocated\n", i);
  71                         goto err;
  72                 }
  73         }
  74
  75         return 0;
  76 err:
  77         while (--i > lun_begin)
  78                 clear_bit(i, dev->lun_map);
  79
  80         return -EBUSY;
  81 }
  82
  83 static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
  84                                  int lun_end)
  85 {
  86         int i;
  87
  88         for (i = lun_begin; i <= lun_end; i++)
  89                 WARN_ON(!test_and_clear_bit(i, dev->lun_map));
  90 }
  91
  92 static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev)
  93 {
  94         struct nvm_dev *dev = tgt_dev->parent;
  95         struct nvm_dev_map *dev_map = tgt_dev->map;
  96         int i, j;
  97
  98         for (i = 0; i < dev_map->nr_chnls; i++) {
  99                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 100                 int *lun_offs = ch_map->lun_offs;
 101                 int ch = i + ch_map->ch_off;
 102
 103                 for (j = 0; j < ch_map->nr_luns; j++) {
 104                         int lun = j + lun_offs[j];
 105                         int lunid = (ch * dev->geo.luns_per_chnl) + lun;
 106
 107                         WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
 108                 }
 109
 110                 kfree(ch_map->lun_offs);
 111         }
 112
 113         kfree(dev_map->chnls);
 114         kfree(dev_map);
 115
 116         kfree(tgt_dev->luns);
 117         kfree(tgt_dev);
 118 }
 119
 120 static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
 121                                               int lun_begin, int lun_end)
 122 {
 123         struct nvm_tgt_dev *tgt_dev = NULL;
 124         struct nvm_dev_map *dev_rmap = dev->rmap;
 125         struct nvm_dev_map *dev_map;
 126         struct ppa_addr *luns;
 127         int nr_luns = lun_end - lun_begin + 1;
 128         int luns_left = nr_luns;
 129         int nr_chnls = nr_luns / dev->geo.luns_per_chnl;
 130         int nr_chnls_mod = nr_luns % dev->geo.luns_per_chnl;
 131         int bch = lun_begin / dev->geo.luns_per_chnl;
 132         int blun = lun_begin % dev->geo.luns_per_chnl;
 133         int lunid = 0;
 134         int lun_balanced = 1;
 135         int prev_nr_luns;
 136         int i, j;
 137
 138         nr_chnls = nr_luns / dev->geo.luns_per_chnl;
 139         nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1;
 140
 141         dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 142         if (!dev_map)
 143                 goto err_dev;
 144
 145         dev_map->chnls = kcalloc(nr_chnls, sizeof(struct nvm_ch_map),
 146                                                                 GFP_KERNEL);
 147         if (!dev_map->chnls)
 148                 goto err_chnls;
 149
 150         luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL);
 151         if (!luns)
 152                 goto err_luns;
 153
 154         prev_nr_luns = (luns_left > dev->geo.luns_per_chnl) ?
 155                                         dev->geo.luns_per_chnl : luns_left;
 156         for (i = 0; i < nr_chnls; i++) {
 157                 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
 158                 int *lun_roffs = ch_rmap->lun_offs;
 159                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 160                 int *lun_offs;
 161                 int luns_in_chnl = (luns_left > dev->geo.luns_per_chnl) ?
 162                                         dev->geo.luns_per_chnl : luns_left;
 163
 164                 if (lun_balanced && prev_nr_luns != luns_in_chnl)
 165                         lun_balanced = 0;
 166
 167                 ch_map->ch_off = ch_rmap->ch_off = bch;
 168                 ch_map->nr_luns = luns_in_chnl;
 169
 170                 lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 171                 if (!lun_offs)
 172                         goto err_ch;
 173
 174                 for (j = 0; j < luns_in_chnl; j++) {
 175                         luns[lunid].ppa = 0;
 176                         luns[lunid].g.ch = i;
 177                         luns[lunid++].g.lun = j;
 178
 179                         lun_offs[j] = blun;
 180                         lun_roffs[j + blun] = blun;
 181                 }
 182
 183                 ch_map->lun_offs = lun_offs;
 184
 185                 /* when starting a new channel, lun offset is reset */
 186                 blun = 0;
 187                 luns_left -= luns_in_chnl;
 188         }
 189
 190         dev_map->nr_chnls = nr_chnls;
 191
 192         tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
 193         if (!tgt_dev)
 194                 goto err_ch;
 195
 196         memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
 197         /* Target device only owns a portion of the physical device */
 198         tgt_dev->geo.nr_chnls = nr_chnls;
 199         tgt_dev->geo.nr_luns = nr_luns;
 200         tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1;
 201         tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun;
 202         tgt_dev->q = dev->q;
 203         tgt_dev->map = dev_map;
 204         tgt_dev->luns = luns;
 205         memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id));
 206
 207         tgt_dev->parent = dev;
 208
 209         return tgt_dev;
 210 err_ch:
 211         while (--i > 0)
 212                 kfree(dev_map->chnls[i].lun_offs);
 213         kfree(luns);
 214 err_luns:
 215         kfree(dev_map->chnls);
 216 err_chnls:
 217         kfree(dev_map);
 218 err_dev:
 219         return tgt_dev;
 220 }
 221
 222 static const struct block_device_operations nvm_fops = {
 223         .owner          = THIS_MODULE,
 224 };
 225
 226 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 227 {
 228         struct nvm_ioctl_create_simple *s = &create->conf.s;
 229         struct request_queue *tqueue;
 230         struct gendisk *tdisk;
 231         struct nvm_tgt_type *tt;
 232         struct nvm_target *t;
 233         struct nvm_tgt_dev *tgt_dev;
 234         void *targetdata;
 235
 236         tt = nvm_find_target_type(create->tgttype, 1);
 237         if (!tt) {
 238                 pr_err("nvm: target type %s not found\n", create->tgttype);
 239                 return -EINVAL;
 240         }
 241
 242         mutex_lock(&dev->mlock);
 243         t = nvm_find_target(dev, create->tgtname);
 244         if (t) {
 245                 pr_err("nvm: target name already exists.\n");
 246                 mutex_unlock(&dev->mlock);
 247                 return -EINVAL;
 248         }
 249         mutex_unlock(&dev->mlock);
 250
 251         if (nvm_reserve_luns(dev, s->lun_begin, s->lun_end))
 252                 return -ENOMEM;
 253
 254         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 255         if (!t)
 256                 goto err_reserve;
 257
 258         tgt_dev = nvm_create_tgt_dev(dev, s->lun_begin, s->lun_end);
 259         if (!tgt_dev) {
 260                 pr_err("nvm: could not create target device\n");
 261                 goto err_t;
 262         }
 263
 264         tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
 265         if (!tqueue)
 266                 goto err_dev;
 267         blk_queue_make_request(tqueue, tt->make_rq);
 268
 269         tdisk = alloc_disk(0);
 270         if (!tdisk)
 271                 goto err_queue;
 272
 273         sprintf(tdisk->disk_name, "%s", create->tgtname);
 274         tdisk->flags = GENHD_FL_EXT_DEVT;
 275         tdisk->major = 0;
 276         tdisk->first_minor = 0;
 277         tdisk->fops = &nvm_fops;
 278         tdisk->queue = tqueue;
 279
 280         targetdata = tt->init(tgt_dev, tdisk);
 281         if (IS_ERR(targetdata))
 282                 goto err_init;
 283
 284         tdisk->private_data = targetdata;
 285         tqueue->queuedata = targetdata;
 286
 287         blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
 288
 289         set_capacity(tdisk, tt->capacity(targetdata));
 290         add_disk(tdisk);
 291
 292         t->type = tt;
 293         t->disk = tdisk;
 294         t->dev = tgt_dev;
 295
 296         mutex_lock(&dev->mlock);
 297         list_add_tail(&t->list, &dev->targets);
 298         mutex_unlock(&dev->mlock);
 299
 300         return 0;
 301 err_init:
 302         put_disk(tdisk);
 303 err_queue:
 304         blk_cleanup_queue(tqueue);
 305 err_dev:
 306         kfree(tgt_dev);
 307 err_t:
 308         kfree(t);
 309 err_reserve:
 310         nvm_release_luns_err(dev, s->lun_begin, s->lun_end);
 311         return -ENOMEM;
 312 }
 313
 314 static void __nvm_remove_target(struct nvm_target *t)
 315 {
 316         struct nvm_tgt_type *tt = t->type;
 317         struct gendisk *tdisk = t->disk;
 318         struct request_queue *q = tdisk->queue;
 319
 320         del_gendisk(tdisk);
 321         blk_cleanup_queue(q);
 322
 323         if (tt->exit)
 324                 tt->exit(tdisk->private_data);
 325
 326         nvm_remove_tgt_dev(t->dev);
 327         put_disk(tdisk);
 328
 329         list_del(&t->list);
 330         kfree(t);
 331 }
 332
 333 /**
 334  * nvm_remove_tgt - Removes a target from the media manager
 335  * @dev:        device
 336  * @remove:     ioctl structure with target name to remove.
 337  *
 338  * Returns:
 339  * 0: on success
 340  * 1: on not found
 341  * <0: on error
 342  */
 343 static int nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
 344 {
 345         struct nvm_target *t;
 346
 347         mutex_lock(&dev->mlock);
 348         t = nvm_find_target(dev, remove->tgtname);
 349         if (!t) {
 350                 mutex_unlock(&dev->mlock);
 351                 return 1;
 352         }
 353         __nvm_remove_target(t);
 354         mutex_unlock(&dev->mlock);
 355
 356         return 0;
 357 }
 358
 359 static int nvm_register_map(struct nvm_dev *dev)
 360 {
 361         struct nvm_dev_map *rmap;
 362         int i, j;
 363
 364         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 365         if (!rmap)
 366                 goto err_rmap;
 367
 368         rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct nvm_ch_map),
 369                                                                 GFP_KERNEL);
 370         if (!rmap->chnls)
 371                 goto err_chnls;
 372
 373         for (i = 0; i < dev->geo.nr_chnls; i++) {
 374                 struct nvm_ch_map *ch_rmap;
 375                 int *lun_roffs;
 376                 int luns_in_chnl = dev->geo.luns_per_chnl;
 377
 378                 ch_rmap = &rmap->chnls[i];
 379
 380                 ch_rmap->ch_off = -1;
 381                 ch_rmap->nr_luns = luns_in_chnl;
 382
 383                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 384                 if (!lun_roffs)
 385                         goto err_ch;
 386
 387                 for (j = 0; j < luns_in_chnl; j++)
 388                         lun_roffs[j] = -1;
 389
 390                 ch_rmap->lun_offs = lun_roffs;
 391         }
 392
 393         dev->rmap = rmap;
 394
 395         return 0;
 396 err_ch:
 397         while (--i >= 0)
 398                 kfree(rmap->chnls[i].lun_offs);
 399 err_chnls:
 400         kfree(rmap);
 401 err_rmap:
 402         return -ENOMEM;
 403 }
 404
 405 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 406 {
 407         struct nvm_dev_map *dev_map = tgt_dev->map;
 408         struct nvm_ch_map *ch_map = &dev_map->chnls[p->g.ch];
 409         int lun_off = ch_map->lun_offs[p->g.lun];
 410
 411         p->g.ch += ch_map->ch_off;
 412         p->g.lun += lun_off;
 413 }
 414
 415 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 416 {
 417         struct nvm_dev *dev = tgt_dev->parent;
 418         struct nvm_dev_map *dev_rmap = dev->rmap;
 419         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
 420         int lun_roff = ch_rmap->lun_offs[p->g.lun];
 421
 422         p->g.ch -= ch_rmap->ch_off;
 423         p->g.lun -= lun_roff;
 424 }
 425
 426 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 427                                 struct ppa_addr *ppa_list, int nr_ppas)
 428 {
 429         int i;
 430
 431         for (i = 0; i < nr_ppas; i++) {
 432                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 433                 ppa_list[i] = generic_to_dev_addr(tgt_dev, ppa_list[i]);
 434         }
 435 }
 436
 437 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 438                                 struct ppa_addr *ppa_list, int nr_ppas)
 439 {
 440         int i;
 441
 442         for (i = 0; i < nr_ppas; i++) {
 443                 ppa_list[i] = dev_to_generic_addr(tgt_dev, ppa_list[i]);
 444                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 445         }
 446 }
 447
 448 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 449 {
 450         if (rqd->nr_ppas == 1) {
 451                 nvm_ppa_tgt_to_dev(tgt_dev, &rqd->ppa_addr, 1);
 452                 return;
 453         }
 454
 455         nvm_ppa_tgt_to_dev(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 456 }
 457
 458 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 459 {
 460         if (rqd->nr_ppas == 1) {
 461                 nvm_ppa_dev_to_tgt(tgt_dev, &rqd->ppa_addr, 1);
 462                 return;
 463         }
 464
 465         nvm_ppa_dev_to_tgt(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 466 }
 467
 468 void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
 469                      int len)
 470 {
 471         struct nvm_geo *geo = &dev->geo;
 472         struct nvm_dev_map *dev_rmap = dev->rmap;
 473         u64 i;
 474
 475         for (i = 0; i < len; i++) {
 476                 struct nvm_ch_map *ch_rmap;
 477                 int *lun_roffs;
 478                 struct ppa_addr gaddr;
 479                 u64 pba = le64_to_cpu(entries[i]);
 480                 int off;
 481                 u64 diff;
 482
 483                 if (!pba)
 484                         continue;
 485
 486                 gaddr = linear_to_generic_addr(geo, pba);
 487                 ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
 488                 lun_roffs = ch_rmap->lun_offs;
 489
 490                 off = gaddr.g.ch * geo->luns_per_chnl + gaddr.g.lun;
 491
 492                 diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
 493                                 (lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
 494
 495                 entries[i] -= cpu_to_le64(diff);
 496         }
 497 }
 498 EXPORT_SYMBOL(nvm_part_to_tgt);
 499
 500 struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
 501 {
 502         struct nvm_tgt_type *tmp, *tt = NULL;
 503
 504         if (lock)
 505                 down_write(&nvm_tgtt_lock);
 506
 507         list_for_each_entry(tmp, &nvm_tgt_types, list)
 508                 if (!strcmp(name, tmp->name)) {
 509                         tt = tmp;
 510                         break;
 511                 }
 512
 513         if (lock)
 514                 up_write(&nvm_tgtt_lock);
 515         return tt;
 516 }
 517 EXPORT_SYMBOL(nvm_find_target_type);
 518
 519 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 520 {
 521         int ret = 0;
 522
 523         down_write(&nvm_tgtt_lock);
 524         if (nvm_find_target_type(tt->name, 0))
 525                 ret = -EEXIST;
 526         else
 527                 list_add(&tt->list, &nvm_tgt_types);
 528         up_write(&nvm_tgtt_lock);
 529
 530         return ret;
 531 }
 532 EXPORT_SYMBOL(nvm_register_tgt_type);
 533
 534 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 535 {
 536         if (!tt)
 537                 return;
 538
 539         down_write(&nvm_lock);
 540         list_del(&tt->list);
 541         up_write(&nvm_lock);
 542 }
 543 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 544
 545 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 546                                                         dma_addr_t *dma_handler)
 547 {
 548         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 549                                                                 dma_handler);
 550 }
 551 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 552
 553 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 554 {
 555         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 556 }
 557 EXPORT_SYMBOL(nvm_dev_dma_free);
 558
 559 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 560 {
 561         struct nvm_dev *dev;
 562
 563         list_for_each_entry(dev, &nvm_devices, devices)
 564                 if (!strcmp(name, dev->name))
 565                         return dev;
 566
 567         return NULL;
 568 }
 569
 570 int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 571                        int nr_ppas, int type)
 572 {
 573         struct nvm_dev *dev = tgt_dev->parent;
 574         struct nvm_rq rqd;
 575         int ret;
 576
 577         if (nr_ppas > dev->ops->max_phys_sect) {
 578                 pr_err("nvm: unable to update all blocks atomically\n");
 579                 return -EINVAL;
 580         }
 581
 582         memset(&rqd, 0, sizeof(struct nvm_rq));
 583
 584         nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas, 1);
 585         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
 586
 587         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
 588         nvm_free_rqd_ppalist(dev, &rqd);
 589         if (ret) {
 590                 pr_err("nvm: failed bb mark\n");
 591                 return -EINVAL;
 592         }
 593
 594         return 0;
 595 }
 596 EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
 597
 598 int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
 599 {
 600         struct nvm_dev *dev = tgt_dev->parent;
 601
 602         return dev->ops->max_phys_sect;
 603 }
 604 EXPORT_SYMBOL(nvm_max_phys_sects);
 605
 606 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 607 {
 608         struct nvm_dev *dev = tgt_dev->parent;
 609
 610         if (!dev->ops->submit_io)
 611                 return -ENODEV;
 612
 613         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 614
 615         rqd->dev = tgt_dev;
 616         return dev->ops->submit_io(dev, rqd);
 617 }
 618 EXPORT_SYMBOL(nvm_submit_io);
 619
 620 int nvm_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int flags)
 621 {
 622         struct nvm_dev *dev = tgt_dev->parent;
 623         struct nvm_rq rqd;
 624         int ret;
 625
 626         if (!dev->ops->erase_block)
 627                 return 0;
 628
 629         nvm_map_to_dev(tgt_dev, ppas);
 630
 631         memset(&rqd, 0, sizeof(struct nvm_rq));
 632
 633         ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, 1, 1);
 634         if (ret)
 635                 return ret;
 636
 637         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
 638
 639         rqd.flags = flags;
 640
 641         ret = dev->ops->erase_block(dev, &rqd);
 642
 643         nvm_free_rqd_ppalist(dev, &rqd);
 644
 645         return ret;
 646 }
 647 EXPORT_SYMBOL(nvm_erase_blk);
 648
 649 int nvm_get_l2p_tbl(struct nvm_tgt_dev *tgt_dev, u64 slba, u32 nlb,
 650                     nvm_l2p_update_fn *update_l2p, void *priv)
 651 {
 652         struct nvm_dev *dev = tgt_dev->parent;
 653
 654         if (!dev->ops->get_l2p_tbl)
 655                 return 0;
 656
 657         return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
 658 }
 659 EXPORT_SYMBOL(nvm_get_l2p_tbl);
 660
 661 int nvm_get_area(struct nvm_tgt_dev *tgt_dev, sector_t *lba, sector_t len)
 662 {
 663         struct nvm_dev *dev = tgt_dev->parent;
 664         struct nvm_geo *geo = &dev->geo;
 665         struct nvm_area *area, *prev, *next;
 666         sector_t begin = 0;
 667         sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9;
 668
 669         if (len > max_sectors)
 670                 return -EINVAL;
 671
 672         area = kmalloc(sizeof(struct nvm_area), GFP_KERNEL);
 673         if (!area)
 674                 return -ENOMEM;
 675
 676         prev = NULL;
 677
 678         spin_lock(&dev->lock);
 679         list_for_each_entry(next, &dev->area_list, list) {
 680                 if (begin + len > next->begin) {
 681                         begin = next->end;
 682                         prev = next;
 683                         continue;
 684                 }
 685                 break;
 686         }
 687
 688         if ((begin + len) > max_sectors) {
 689                 spin_unlock(&dev->lock);
 690                 kfree(area);
 691                 return -EINVAL;
 692         }
 693
 694         area->begin = *lba = begin;
 695         area->end = begin + len;
 696
 697         if (prev) /* insert into sorted order */
 698                 list_add(&area->list, &prev->list);
 699         else
 700                 list_add(&area->list, &dev->area_list);
 701         spin_unlock(&dev->lock);
 702
 703         return 0;
 704 }
 705 EXPORT_SYMBOL(nvm_get_area);
 706
 707 void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin)
 708 {
 709         struct nvm_dev *dev = tgt_dev->parent;
 710         struct nvm_area *area;
 711
 712         spin_lock(&dev->lock);
 713         list_for_each_entry(area, &dev->area_list, list) {
 714                 if (area->begin != begin)
 715                         continue;
 716
 717                 list_del(&area->list);
 718                 spin_unlock(&dev->lock);
 719                 kfree(area);
 720                 return;
 721         }
 722         spin_unlock(&dev->lock);
 723 }
 724 EXPORT_SYMBOL(nvm_put_area);
 725
 726 int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
 727                         const struct ppa_addr *ppas, int nr_ppas, int vblk)
 728 {
 729         struct nvm_geo *geo = &dev->geo;
 730         int i, plane_cnt, pl_idx;
 731         struct ppa_addr ppa;
 732
 733         if ((!vblk || geo->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) {
 734                 rqd->nr_ppas = nr_ppas;
 735                 rqd->ppa_addr = ppas[0];
 736
 737                 return 0;
 738         }
 739
 740         rqd->nr_ppas = nr_ppas;
 741         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 742         if (!rqd->ppa_list) {
 743                 pr_err("nvm: failed to allocate dma memory\n");
 744                 return -ENOMEM;
 745         }
 746
 747         if (!vblk) {
 748                 for (i = 0; i < nr_ppas; i++)
 749                         rqd->ppa_list[i] = ppas[i];
 750         } else {
 751                 plane_cnt = geo->plane_mode;
 752                 rqd->nr_ppas *= plane_cnt;
 753
 754                 for (i = 0; i < nr_ppas; i++) {
 755                         for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 756                                 ppa = ppas[i];
 757                                 ppa.g.pl = pl_idx;
 758                                 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 759                         }
 760                 }
 761         }
 762
 763         return 0;
 764 }
 765 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
 766
 767 void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
 768 {
 769         if (!rqd->ppa_list)
 770                 return;
 771
 772         nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
 773 }
 774 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
 775
 776 void nvm_end_io(struct nvm_rq *rqd, int error)
 777 {
 778         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 779         struct nvm_tgt_instance *ins = rqd->ins;
 780
 781         /* Convert address space */
 782         if (tgt_dev)
 783                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 784
 785         rqd->error = error;
 786         ins->tt->end_io(rqd);
 787 }
 788 EXPORT_SYMBOL(nvm_end_io);
 789
 790 /*
 791  * folds a bad block list from its plane representation to its virtual
 792  * block representation. The fold is done in place and reduced size is
 793  * returned.
 794  *
 795  * If any of the planes status are bad or grown bad block, the virtual block
 796  * is marked bad. If not bad, the first plane state acts as the block state.
 797  */
 798 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 799 {
 800         struct nvm_geo *geo = &dev->geo;
 801         int blk, offset, pl, blktype;
 802
 803         if (nr_blks != geo->blks_per_lun * geo->plane_mode)
 804                 return -EINVAL;
 805
 806         for (blk = 0; blk < geo->blks_per_lun; blk++) {
 807                 offset = blk * geo->plane_mode;
 808                 blktype = blks[offset];
 809
 810                 /* Bad blocks on any planes take precedence over other types */
 811                 for (pl = 0; pl < geo->plane_mode; pl++) {
 812                         if (blks[offset + pl] &
 813                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 814                                 blktype = blks[offset + pl];
 815                                 break;
 816                         }
 817                 }
 818
 819                 blks[blk] = blktype;
 820         }
 821
 822         return geo->blks_per_lun;
 823 }
 824 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 825
 826 int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 827                        u8 *blks)
 828 {
 829         struct nvm_dev *dev = tgt_dev->parent;
 830
 831         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
 832
 833         return dev->ops->get_bb_tbl(dev, ppa, blks);
 834 }
 835 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 836
 837 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 838 {
 839         struct nvm_geo *geo = &dev->geo;
 840         int i;
 841
 842         dev->lps_per_blk = geo->pgs_per_blk;
 843         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 844         if (!dev->lptbl)
 845                 return -ENOMEM;
 846
 847         /* Just a linear array */
 848         for (i = 0; i < dev->lps_per_blk; i++)
 849                 dev->lptbl[i] = i;
 850
 851         return 0;
 852 }
 853
 854 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 855 {
 856         int i, p;
 857         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 858
 859         if (!mlc->num_pairs)
 860                 return 0;
 861
 862         dev->lps_per_blk = mlc->num_pairs;
 863         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 864         if (!dev->lptbl)
 865                 return -ENOMEM;
 866
 867         /* The lower page table encoding consists of a list of bytes, where each
 868          * has a lower and an upper half. The first half byte maintains the
 869          * increment value and every value after is an offset added to the
 870          * previous incrementation value
 871          */
 872         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 873         for (i = 1; i < dev->lps_per_blk; i++) {
 874                 p = mlc->pairs[i >> 1];
 875                 if (i & 0x1) /* upper */
 876                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 877                 else /* lower */
 878                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 879         }
 880
 881         return 0;
 882 }
 883
 884 static int nvm_core_init(struct nvm_dev *dev)
 885 {
 886         struct nvm_id *id = &dev->identity;
 887         struct nvm_id_group *grp = &id->grp;
 888         struct nvm_geo *geo = &dev->geo;
 889         int ret;
 890
 891         /* Whole device values */
 892         geo->nr_chnls = grp->num_ch;
 893         geo->luns_per_chnl = grp->num_lun;
 894
 895         /* Generic device values */
 896         geo->pgs_per_blk = grp->num_pg;
 897         geo->blks_per_lun = grp->num_blk;
 898         geo->nr_planes = grp->num_pln;
 899         geo->fpg_size = grp->fpg_sz;
 900         geo->pfpg_size = grp->fpg_sz * grp->num_pln;
 901         geo->sec_size = grp->csecs;
 902         geo->oob_size = grp->sos;
 903         geo->sec_per_pg = grp->fpg_sz / grp->csecs;
 904         geo->mccap = grp->mccap;
 905         memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 906
 907         geo->plane_mode = NVM_PLANE_SINGLE;
 908         geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
 909
 910         if (grp->mpos & 0x020202)
 911                 geo->plane_mode = NVM_PLANE_DOUBLE;
 912         if (grp->mpos & 0x040404)
 913                 geo->plane_mode = NVM_PLANE_QUAD;
 914
 915         if (grp->mtype != 0) {
 916                 pr_err("nvm: memory type not supported\n");
 917                 return -EINVAL;
 918         }
 919
 920         /* calculated values */
 921         geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
 922         geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
 923         geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
 924         geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
 925
 926         dev->total_secs = geo->nr_luns * geo->sec_per_lun;
 927         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->nr_luns),
 928                                         sizeof(unsigned long), GFP_KERNEL);
 929         if (!dev->lun_map)
 930                 return -ENOMEM;
 931
 932         switch (grp->fmtype) {
 933         case NVM_ID_FMTYPE_SLC:
 934                 if (nvm_init_slc_tbl(dev, grp)) {
 935                         ret = -ENOMEM;
 936                         goto err_fmtype;
 937                 }
 938                 break;
 939         case NVM_ID_FMTYPE_MLC:
 940                 if (nvm_init_mlc_tbl(dev, grp)) {
 941                         ret = -ENOMEM;
 942                         goto err_fmtype;
 943                 }
 944                 break;
 945         default:
 946                 pr_err("nvm: flash type not supported\n");
 947                 ret = -EINVAL;
 948                 goto err_fmtype;
 949         }
 950
 951         INIT_LIST_HEAD(&dev->area_list);
 952         INIT_LIST_HEAD(&dev->targets);
 953         mutex_init(&dev->mlock);
 954         spin_lock_init(&dev->lock);
 955
 956         ret = nvm_register_map(dev);
 957         if (ret)
 958                 goto err_fmtype;
 959
 960         blk_queue_logical_block_size(dev->q, geo->sec_size);
 961         return 0;
 962 err_fmtype:
 963         kfree(dev->lun_map);
 964         return ret;
 965 }
 966
 967 void nvm_free(struct nvm_dev *dev)
 968 {
 969         if (!dev)
 970                 return;
 971
 972         if (dev->dma_pool)
 973                 dev->ops->destroy_dma_pool(dev->dma_pool);
 974
 975         kfree(dev->rmap);
 976         kfree(dev->lptbl);
 977         kfree(dev->lun_map);
 978         kfree(dev);
 979 }
 980
 981 static int nvm_init(struct nvm_dev *dev)
 982 {
 983         struct nvm_geo *geo = &dev->geo;
 984         int ret = -EINVAL;
 985
 986         if (dev->ops->identity(dev, &dev->identity)) {
 987                 pr_err("nvm: device could not be identified\n");
 988                 goto err;
 989         }
 990
 991         pr_debug("nvm: ver:%x nvm_vendor:%x\n",
 992                         dev->identity.ver_id, dev->identity.vmnt);
 993
 994         if (dev->identity.ver_id != 1) {
 995                 pr_err("nvm: device not supported by kernel.");
 996                 goto err;
 997         }
 998
 999         ret = nvm_core_init(dev);
1000         if (ret) {
1001                 pr_err("nvm: could not initialize core structures.\n");
1002                 goto err;
1003         }
1004
1005         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
1006                         dev->name, geo->sec_per_pg, geo->nr_planes,
1007                         geo->pgs_per_blk, geo->blks_per_lun,
1008                         geo->nr_luns, geo->nr_chnls);
1009         return 0;
1010 err:
1011         pr_err("nvm: failed to initialize nvm\n");
1012         return ret;
1013 }
1014
1015 struct nvm_dev *nvm_alloc_dev(int node)
1016 {
1017         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1018 }
1019 EXPORT_SYMBOL(nvm_alloc_dev);
1020
1021 int nvm_register(struct nvm_dev *dev)
1022 {
1023         int ret;
1024
1025         if (!dev->q || !dev->ops)
1026                 return -EINVAL;
1027
1028         if (dev->ops->max_phys_sect > 256) {
1029                 pr_info("nvm: max sectors supported is 256.\n");
1030                 return -EINVAL;
1031         }
1032
1033         if (dev->ops->max_phys_sect > 1) {
1034                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1035                 if (!dev->dma_pool) {
1036                         pr_err("nvm: could not create dma pool\n");
1037                         return -ENOMEM;
1038                 }
1039         }
1040
1041         ret = nvm_init(dev);
1042         if (ret)
1043                 goto err_init;
1044
1045         /* register device with a supported media manager */
1046         down_write(&nvm_lock);
1047         list_add(&dev->devices, &nvm_devices);
1048         up_write(&nvm_lock);
1049
1050         return 0;
1051 err_init:
1052         dev->ops->destroy_dma_pool(dev->dma_pool);
1053         return ret;
1054 }
1055 EXPORT_SYMBOL(nvm_register);
1056
1057 void nvm_unregister(struct nvm_dev *dev)
1058 {
1059         struct nvm_target *t, *tmp;
1060
1061         mutex_lock(&dev->mlock);
1062         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1063                 if (t->dev->parent != dev)
1064                         continue;
1065                 __nvm_remove_target(t);
1066         }
1067         mutex_unlock(&dev->mlock);
1068
1069         down_write(&nvm_lock);
1070         list_del(&dev->devices);
1071         up_write(&nvm_lock);
1072
1073         nvm_free(dev);
1074 }
1075 EXPORT_SYMBOL(nvm_unregister);
1076
1077 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1078 {
1079         struct nvm_dev *dev;
1080         struct nvm_ioctl_create_simple *s;
1081
1082         down_write(&nvm_lock);
1083         dev = nvm_find_nvm_dev(create->dev);
1084         up_write(&nvm_lock);
1085
1086         if (!dev) {
1087                 pr_err("nvm: device not found\n");
1088                 return -EINVAL;
1089         }
1090
1091         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
1092                 pr_err("nvm: config type not valid\n");
1093                 return -EINVAL;
1094         }
1095         s = &create->conf.s;
1096
1097         if (s->lun_begin > s->lun_end || s->lun_end > dev->geo.nr_luns) {
1098                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
1099                         s->lun_begin, s->lun_end, dev->geo.nr_luns);
1100                 return -EINVAL;
1101         }
1102
1103         return nvm_create_tgt(dev, create);
1104 }
1105
1106 static long nvm_ioctl_info(struct file *file, void __user *arg)
1107 {
1108         struct nvm_ioctl_info *info;
1109         struct nvm_tgt_type *tt;
1110         int tgt_iter = 0;
1111
1112         if (!capable(CAP_SYS_ADMIN))
1113                 return -EPERM;
1114
1115         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1116         if (IS_ERR(info))
1117                 return -EFAULT;
1118
1119         info->version[0] = NVM_VERSION_MAJOR;
1120         info->version[1] = NVM_VERSION_MINOR;
1121         info->version[2] = NVM_VERSION_PATCH;
1122
1123         down_write(&nvm_lock);
1124         list_for_each_entry(tt, &nvm_tgt_types, list) {
1125                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1126
1127                 tgt->version[0] = tt->version[0];
1128                 tgt->version[1] = tt->version[1];
1129                 tgt->version[2] = tt->version[2];
1130                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1131
1132                 tgt_iter++;
1133         }
1134
1135         info->tgtsize = tgt_iter;
1136         up_write(&nvm_lock);
1137
1138         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1139                 kfree(info);
1140                 return -EFAULT;
1141         }
1142
1143         kfree(info);
1144         return 0;
1145 }
1146
1147 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1148 {
1149         struct nvm_ioctl_get_devices *devices;
1150         struct nvm_dev *dev;
1151         int i = 0;
1152
1153         if (!capable(CAP_SYS_ADMIN))
1154                 return -EPERM;
1155
1156         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1157         if (!devices)
1158                 return -ENOMEM;
1159
1160         down_write(&nvm_lock);
1161         list_for_each_entry(dev, &nvm_devices, devices) {
1162                 struct nvm_ioctl_device_info *info = &devices->info[i];
1163
1164                 sprintf(info->devname, "%s", dev->name);
1165
1166                 /* kept for compatibility */
1167                 info->bmversion[0] = 1;
1168                 info->bmversion[1] = 0;
1169                 info->bmversion[2] = 0;
1170                 sprintf(info->bmname, "%s", "gennvm");
1171                 i++;
1172
1173                 if (i > 31) {
1174                         pr_err("nvm: max 31 devices can be reported.\n");
1175                         break;
1176                 }
1177         }
1178         up_write(&nvm_lock);
1179
1180         devices->nr_devices = i;
1181
1182         if (copy_to_user(arg, devices,
1183                          sizeof(struct nvm_ioctl_get_devices))) {
1184                 kfree(devices);
1185                 return -EFAULT;
1186         }
1187
1188         kfree(devices);
1189         return 0;
1190 }
1191
1192 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1193 {
1194         struct nvm_ioctl_create create;
1195
1196         if (!capable(CAP_SYS_ADMIN))
1197                 return -EPERM;
1198
1199         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1200                 return -EFAULT;
1201
1202         create.dev[DISK_NAME_LEN - 1] = '\0';
1203         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1204         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1205
1206         if (create.flags != 0) {
1207                 pr_err("nvm: no flags supported\n");
1208                 return -EINVAL;
1209         }
1210
1211         return __nvm_configure_create(&create);
1212 }
1213
1214 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1215 {
1216         struct nvm_ioctl_remove remove;
1217         struct nvm_dev *dev;
1218         int ret = 0;
1219
1220         if (!capable(CAP_SYS_ADMIN))
1221                 return -EPERM;
1222
1223         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1224                 return -EFAULT;
1225
1226         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1227
1228         if (remove.flags != 0) {
1229                 pr_err("nvm: no flags supported\n");
1230                 return -EINVAL;
1231         }
1232
1233         list_for_each_entry(dev, &nvm_devices, devices) {
1234                 ret = nvm_remove_tgt(dev, &remove);
1235                 if (!ret)
1236                         break;
1237         }
1238
1239         return ret;
1240 }
1241
1242 /* kept for compatibility reasons */
1243 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1244 {
1245         struct nvm_ioctl_dev_init init;
1246
1247         if (!capable(CAP_SYS_ADMIN))
1248                 return -EPERM;
1249
1250         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1251                 return -EFAULT;
1252
1253         if (init.flags != 0) {
1254                 pr_err("nvm: no flags supported\n");
1255                 return -EINVAL;
1256         }
1257
1258         return 0;
1259 }
1260
1261 /* Kept for compatibility reasons */
1262 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1263 {
1264         struct nvm_ioctl_dev_factory fact;
1265
1266         if (!capable(CAP_SYS_ADMIN))
1267                 return -EPERM;
1268
1269         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1270                 return -EFAULT;
1271
1272         fact.dev[DISK_NAME_LEN - 1] = '\0';
1273
1274         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1275                 return -EINVAL;
1276
1277         return 0;
1278 }
1279
1280 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1281 {
1282         void __user *argp = (void __user *)arg;
1283
1284         switch (cmd) {
1285         case NVM_INFO:
1286                 return nvm_ioctl_info(file, argp);
1287         case NVM_GET_DEVICES:
1288                 return nvm_ioctl_get_devices(file, argp);
1289         case NVM_DEV_CREATE:
1290                 return nvm_ioctl_dev_create(file, argp);
1291         case NVM_DEV_REMOVE:
1292                 return nvm_ioctl_dev_remove(file, argp);
1293         case NVM_DEV_INIT:
1294                 return nvm_ioctl_dev_init(file, argp);
1295         case NVM_DEV_FACTORY:
1296                 return nvm_ioctl_dev_factory(file, argp);
1297         }
1298         return 0;
1299 }
1300
1301 static const struct file_operations _ctl_fops = {
1302         .open = nonseekable_open,
1303         .unlocked_ioctl = nvm_ctl_ioctl,
1304         .owner = THIS_MODULE,
1305         .llseek  = noop_llseek,
1306 };
1307
1308 static struct miscdevice _nvm_misc = {
1309         .minor          = MISC_DYNAMIC_MINOR,
1310         .name           = "lightnvm",
1311         .nodename       = "lightnvm/control",
1312         .fops           = &_ctl_fops,
1313 };
1314 builtin_misc_device(_nvm_misc);