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         nvm_remove_tgt_dev(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)
 777 {
 778         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 779
 780         /* Convert address space */
 781         if (tgt_dev)
 782                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 783
 784         if (rqd->end_io)
 785                 rqd->end_io(rqd);
 786 }
 787 EXPORT_SYMBOL(nvm_end_io);
 788
 789 /*
 790  * folds a bad block list from its plane representation to its virtual
 791  * block representation. The fold is done in place and reduced size is
 792  * returned.
 793  *
 794  * If any of the planes status are bad or grown bad block, the virtual block
 795  * is marked bad. If not bad, the first plane state acts as the block state.
 796  */
 797 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 798 {
 799         struct nvm_geo *geo = &dev->geo;
 800         int blk, offset, pl, blktype;
 801
 802         if (nr_blks != geo->blks_per_lun * geo->plane_mode)
 803                 return -EINVAL;
 804
 805         for (blk = 0; blk < geo->blks_per_lun; blk++) {
 806                 offset = blk * geo->plane_mode;
 807                 blktype = blks[offset];
 808
 809                 /* Bad blocks on any planes take precedence over other types */
 810                 for (pl = 0; pl < geo->plane_mode; pl++) {
 811                         if (blks[offset + pl] &
 812                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 813                                 blktype = blks[offset + pl];
 814                                 break;
 815                         }
 816                 }
 817
 818                 blks[blk] = blktype;
 819         }
 820
 821         return geo->blks_per_lun;
 822 }
 823 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 824
 825 int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 826                        u8 *blks)
 827 {
 828         struct nvm_dev *dev = tgt_dev->parent;
 829
 830         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
 831
 832         return dev->ops->get_bb_tbl(dev, ppa, blks);
 833 }
 834 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 835
 836 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 837 {
 838         struct nvm_geo *geo = &dev->geo;
 839         int i;
 840
 841         dev->lps_per_blk = geo->pgs_per_blk;
 842         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 843         if (!dev->lptbl)
 844                 return -ENOMEM;
 845
 846         /* Just a linear array */
 847         for (i = 0; i < dev->lps_per_blk; i++)
 848                 dev->lptbl[i] = i;
 849
 850         return 0;
 851 }
 852
 853 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 854 {
 855         int i, p;
 856         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 857
 858         if (!mlc->num_pairs)
 859                 return 0;
 860
 861         dev->lps_per_blk = mlc->num_pairs;
 862         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 863         if (!dev->lptbl)
 864                 return -ENOMEM;
 865
 866         /* The lower page table encoding consists of a list of bytes, where each
 867          * has a lower and an upper half. The first half byte maintains the
 868          * increment value and every value after is an offset added to the
 869          * previous incrementation value
 870          */
 871         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 872         for (i = 1; i < dev->lps_per_blk; i++) {
 873                 p = mlc->pairs[i >> 1];
 874                 if (i & 0x1) /* upper */
 875                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 876                 else /* lower */
 877                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 878         }
 879
 880         return 0;
 881 }
 882
 883 static int nvm_core_init(struct nvm_dev *dev)
 884 {
 885         struct nvm_id *id = &dev->identity;
 886         struct nvm_id_group *grp = &id->grp;
 887         struct nvm_geo *geo = &dev->geo;
 888         int ret;
 889
 890         /* Whole device values */
 891         geo->nr_chnls = grp->num_ch;
 892         geo->luns_per_chnl = grp->num_lun;
 893
 894         /* Generic device values */
 895         geo->pgs_per_blk = grp->num_pg;
 896         geo->blks_per_lun = grp->num_blk;
 897         geo->nr_planes = grp->num_pln;
 898         geo->fpg_size = grp->fpg_sz;
 899         geo->pfpg_size = grp->fpg_sz * grp->num_pln;
 900         geo->sec_size = grp->csecs;
 901         geo->oob_size = grp->sos;
 902         geo->sec_per_pg = grp->fpg_sz / grp->csecs;
 903         geo->mccap = grp->mccap;
 904         memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 905
 906         geo->plane_mode = NVM_PLANE_SINGLE;
 907         geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
 908
 909         if (grp->mpos & 0x020202)
 910                 geo->plane_mode = NVM_PLANE_DOUBLE;
 911         if (grp->mpos & 0x040404)
 912                 geo->plane_mode = NVM_PLANE_QUAD;
 913
 914         if (grp->mtype != 0) {
 915                 pr_err("nvm: memory type not supported\n");
 916                 return -EINVAL;
 917         }
 918
 919         /* calculated values */
 920         geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
 921         geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
 922         geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
 923         geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
 924
 925         dev->total_secs = geo->nr_luns * geo->sec_per_lun;
 926         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->nr_luns),
 927                                         sizeof(unsigned long), GFP_KERNEL);
 928         if (!dev->lun_map)
 929                 return -ENOMEM;
 930
 931         switch (grp->fmtype) {
 932         case NVM_ID_FMTYPE_SLC:
 933                 if (nvm_init_slc_tbl(dev, grp)) {
 934                         ret = -ENOMEM;
 935                         goto err_fmtype;
 936                 }
 937                 break;
 938         case NVM_ID_FMTYPE_MLC:
 939                 if (nvm_init_mlc_tbl(dev, grp)) {
 940                         ret = -ENOMEM;
 941                         goto err_fmtype;
 942                 }
 943                 break;
 944         default:
 945                 pr_err("nvm: flash type not supported\n");
 946                 ret = -EINVAL;
 947                 goto err_fmtype;
 948         }
 949
 950         INIT_LIST_HEAD(&dev->area_list);
 951         INIT_LIST_HEAD(&dev->targets);
 952         mutex_init(&dev->mlock);
 953         spin_lock_init(&dev->lock);
 954
 955         ret = nvm_register_map(dev);
 956         if (ret)
 957                 goto err_fmtype;
 958
 959         blk_queue_logical_block_size(dev->q, geo->sec_size);
 960         return 0;
 961 err_fmtype:
 962         kfree(dev->lun_map);
 963         return ret;
 964 }
 965
 966 void nvm_free(struct nvm_dev *dev)
 967 {
 968         if (!dev)
 969                 return;
 970
 971         if (dev->dma_pool)
 972                 dev->ops->destroy_dma_pool(dev->dma_pool);
 973
 974         kfree(dev->rmap);
 975         kfree(dev->lptbl);
 976         kfree(dev->lun_map);
 977         kfree(dev);
 978 }
 979
 980 static int nvm_init(struct nvm_dev *dev)
 981 {
 982         struct nvm_geo *geo = &dev->geo;
 983         int ret = -EINVAL;
 984
 985         if (dev->ops->identity(dev, &dev->identity)) {
 986                 pr_err("nvm: device could not be identified\n");
 987                 goto err;
 988         }
 989
 990         pr_debug("nvm: ver:%x nvm_vendor:%x\n",
 991                         dev->identity.ver_id, dev->identity.vmnt);
 992
 993         if (dev->identity.ver_id != 1) {
 994                 pr_err("nvm: device not supported by kernel.");
 995                 goto err;
 996         }
 997
 998         ret = nvm_core_init(dev);
 999         if (ret) {
1000                 pr_err("nvm: could not initialize core structures.\n");
1001                 goto err;
1002         }
1003
1004         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
1005                         dev->name, geo->sec_per_pg, geo->nr_planes,
1006                         geo->pgs_per_blk, geo->blks_per_lun,
1007                         geo->nr_luns, geo->nr_chnls);
1008         return 0;
1009 err:
1010         pr_err("nvm: failed to initialize nvm\n");
1011         return ret;
1012 }
1013
1014 struct nvm_dev *nvm_alloc_dev(int node)
1015 {
1016         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1017 }
1018 EXPORT_SYMBOL(nvm_alloc_dev);
1019
1020 int nvm_register(struct nvm_dev *dev)
1021 {
1022         int ret;
1023
1024         if (!dev->q || !dev->ops)
1025                 return -EINVAL;
1026
1027         if (dev->ops->max_phys_sect > 256) {
1028                 pr_info("nvm: max sectors supported is 256.\n");
1029                 return -EINVAL;
1030         }
1031
1032         if (dev->ops->max_phys_sect > 1) {
1033                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1034                 if (!dev->dma_pool) {
1035                         pr_err("nvm: could not create dma pool\n");
1036                         return -ENOMEM;
1037                 }
1038         }
1039
1040         ret = nvm_init(dev);
1041         if (ret)
1042                 goto err_init;
1043
1044         /* register device with a supported media manager */
1045         down_write(&nvm_lock);
1046         list_add(&dev->devices, &nvm_devices);
1047         up_write(&nvm_lock);
1048
1049         return 0;
1050 err_init:
1051         dev->ops->destroy_dma_pool(dev->dma_pool);
1052         return ret;
1053 }
1054 EXPORT_SYMBOL(nvm_register);
1055
1056 void nvm_unregister(struct nvm_dev *dev)
1057 {
1058         struct nvm_target *t, *tmp;
1059
1060         mutex_lock(&dev->mlock);
1061         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1062                 if (t->dev->parent != dev)
1063                         continue;
1064                 __nvm_remove_target(t);
1065         }
1066         mutex_unlock(&dev->mlock);
1067
1068         down_write(&nvm_lock);
1069         list_del(&dev->devices);
1070         up_write(&nvm_lock);
1071
1072         nvm_free(dev);
1073 }
1074 EXPORT_SYMBOL(nvm_unregister);
1075
1076 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1077 {
1078         struct nvm_dev *dev;
1079         struct nvm_ioctl_create_simple *s;
1080
1081         down_write(&nvm_lock);
1082         dev = nvm_find_nvm_dev(create->dev);
1083         up_write(&nvm_lock);
1084
1085         if (!dev) {
1086                 pr_err("nvm: device not found\n");
1087                 return -EINVAL;
1088         }
1089
1090         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
1091                 pr_err("nvm: config type not valid\n");
1092                 return -EINVAL;
1093         }
1094         s = &create->conf.s;
1095
1096         if (s->lun_begin > s->lun_end || s->lun_end > dev->geo.nr_luns) {
1097                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
1098                         s->lun_begin, s->lun_end, dev->geo.nr_luns);
1099                 return -EINVAL;
1100         }
1101
1102         return nvm_create_tgt(dev, create);
1103 }
1104
1105 static long nvm_ioctl_info(struct file *file, void __user *arg)
1106 {
1107         struct nvm_ioctl_info *info;
1108         struct nvm_tgt_type *tt;
1109         int tgt_iter = 0;
1110
1111         if (!capable(CAP_SYS_ADMIN))
1112                 return -EPERM;
1113
1114         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1115         if (IS_ERR(info))
1116                 return -EFAULT;
1117
1118         info->version[0] = NVM_VERSION_MAJOR;
1119         info->version[1] = NVM_VERSION_MINOR;
1120         info->version[2] = NVM_VERSION_PATCH;
1121
1122         down_write(&nvm_lock);
1123         list_for_each_entry(tt, &nvm_tgt_types, list) {
1124                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1125
1126                 tgt->version[0] = tt->version[0];
1127                 tgt->version[1] = tt->version[1];
1128                 tgt->version[2] = tt->version[2];
1129                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1130
1131                 tgt_iter++;
1132         }
1133
1134         info->tgtsize = tgt_iter;
1135         up_write(&nvm_lock);
1136
1137         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1138                 kfree(info);
1139                 return -EFAULT;
1140         }
1141
1142         kfree(info);
1143         return 0;
1144 }
1145
1146 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1147 {
1148         struct nvm_ioctl_get_devices *devices;
1149         struct nvm_dev *dev;
1150         int i = 0;
1151
1152         if (!capable(CAP_SYS_ADMIN))
1153                 return -EPERM;
1154
1155         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1156         if (!devices)
1157                 return -ENOMEM;
1158
1159         down_write(&nvm_lock);
1160         list_for_each_entry(dev, &nvm_devices, devices) {
1161                 struct nvm_ioctl_device_info *info = &devices->info[i];
1162
1163                 sprintf(info->devname, "%s", dev->name);
1164
1165                 /* kept for compatibility */
1166                 info->bmversion[0] = 1;
1167                 info->bmversion[1] = 0;
1168                 info->bmversion[2] = 0;
1169                 sprintf(info->bmname, "%s", "gennvm");
1170                 i++;
1171
1172                 if (i > 31) {
1173                         pr_err("nvm: max 31 devices can be reported.\n");
1174                         break;
1175                 }
1176         }
1177         up_write(&nvm_lock);
1178
1179         devices->nr_devices = i;
1180
1181         if (copy_to_user(arg, devices,
1182                          sizeof(struct nvm_ioctl_get_devices))) {
1183                 kfree(devices);
1184                 return -EFAULT;
1185         }
1186
1187         kfree(devices);
1188         return 0;
1189 }
1190
1191 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1192 {
1193         struct nvm_ioctl_create create;
1194
1195         if (!capable(CAP_SYS_ADMIN))
1196                 return -EPERM;
1197
1198         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1199                 return -EFAULT;
1200
1201         create.dev[DISK_NAME_LEN - 1] = '\0';
1202         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1203         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1204
1205         if (create.flags != 0) {
1206                 pr_err("nvm: no flags supported\n");
1207                 return -EINVAL;
1208         }
1209
1210         return __nvm_configure_create(&create);
1211 }
1212
1213 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1214 {
1215         struct nvm_ioctl_remove remove;
1216         struct nvm_dev *dev;
1217         int ret = 0;
1218
1219         if (!capable(CAP_SYS_ADMIN))
1220                 return -EPERM;
1221
1222         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1223                 return -EFAULT;
1224
1225         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1226
1227         if (remove.flags != 0) {
1228                 pr_err("nvm: no flags supported\n");
1229                 return -EINVAL;
1230         }
1231
1232         list_for_each_entry(dev, &nvm_devices, devices) {
1233                 ret = nvm_remove_tgt(dev, &remove);
1234                 if (!ret)
1235                         break;
1236         }
1237
1238         return ret;
1239 }
1240
1241 /* kept for compatibility reasons */
1242 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1243 {
1244         struct nvm_ioctl_dev_init init;
1245
1246         if (!capable(CAP_SYS_ADMIN))
1247                 return -EPERM;
1248
1249         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1250                 return -EFAULT;
1251
1252         if (init.flags != 0) {
1253                 pr_err("nvm: no flags supported\n");
1254                 return -EINVAL;
1255         }
1256
1257         return 0;
1258 }
1259
1260 /* Kept for compatibility reasons */
1261 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1262 {
1263         struct nvm_ioctl_dev_factory fact;
1264
1265         if (!capable(CAP_SYS_ADMIN))
1266                 return -EPERM;
1267
1268         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1269                 return -EFAULT;
1270
1271         fact.dev[DISK_NAME_LEN - 1] = '\0';
1272
1273         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1274                 return -EINVAL;
1275
1276         return 0;
1277 }
1278
1279 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1280 {
1281         void __user *argp = (void __user *)arg;
1282
1283         switch (cmd) {
1284         case NVM_INFO:
1285                 return nvm_ioctl_info(file, argp);
1286         case NVM_GET_DEVICES:
1287                 return nvm_ioctl_get_devices(file, argp);
1288         case NVM_DEV_CREATE:
1289                 return nvm_ioctl_dev_create(file, argp);
1290         case NVM_DEV_REMOVE:
1291                 return nvm_ioctl_dev_remove(file, argp);
1292         case NVM_DEV_INIT:
1293                 return nvm_ioctl_dev_init(file, argp);
1294         case NVM_DEV_FACTORY:
1295                 return nvm_ioctl_dev_factory(file, argp);
1296         }
1297         return 0;
1298 }
1299
1300 static const struct file_operations _ctl_fops = {
1301         .open = nonseekable_open,
1302         .unlocked_ioctl = nvm_ctl_ioctl,
1303         .owner = THIS_MODULE,
1304         .llseek  = noop_llseek,
1305 };
1306
1307 static struct miscdevice _nvm_misc = {
1308         .minor          = MISC_DYNAMIC_MINOR,
1309         .name           = "lightnvm",
1310         .nodename       = "lightnvm/control",
1311         .fops           = &_ctl_fops,
1312 };
1313 builtin_misc_device(_nvm_misc);