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         if (tt->sysfs_init && tt->sysfs_init(tdisk))
 293                 goto err_sysfs;
 294
 295         t->type = tt;
 296         t->disk = tdisk;
 297         t->dev = tgt_dev;
 298
 299         mutex_lock(&dev->mlock);
 300         list_add_tail(&t->list, &dev->targets);
 301         mutex_unlock(&dev->mlock);
 302
 303         return 0;
 304 err_sysfs:
 305         if (tt->exit)
 306                 tt->exit(targetdata);
 307 err_init:
 308         put_disk(tdisk);
 309 err_queue:
 310         blk_cleanup_queue(tqueue);
 311 err_dev:
 312         nvm_remove_tgt_dev(tgt_dev);
 313 err_t:
 314         kfree(t);
 315 err_reserve:
 316         nvm_release_luns_err(dev, s->lun_begin, s->lun_end);
 317         return -ENOMEM;
 318 }
 319
 320 static void __nvm_remove_target(struct nvm_target *t)
 321 {
 322         struct nvm_tgt_type *tt = t->type;
 323         struct gendisk *tdisk = t->disk;
 324         struct request_queue *q = tdisk->queue;
 325
 326         del_gendisk(tdisk);
 327         blk_cleanup_queue(q);
 328
 329         if (tt->sysfs_exit)
 330                 tt->sysfs_exit(tdisk);
 331
 332         if (tt->exit)
 333                 tt->exit(tdisk->private_data);
 334
 335         nvm_remove_tgt_dev(t->dev);
 336         put_disk(tdisk);
 337
 338         list_del(&t->list);
 339         kfree(t);
 340 }
 341
 342 /**
 343  * nvm_remove_tgt - Removes a target from the media manager
 344  * @dev:        device
 345  * @remove:     ioctl structure with target name to remove.
 346  *
 347  * Returns:
 348  * 0: on success
 349  * 1: on not found
 350  * <0: on error
 351  */
 352 static int nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
 353 {
 354         struct nvm_target *t;
 355
 356         mutex_lock(&dev->mlock);
 357         t = nvm_find_target(dev, remove->tgtname);
 358         if (!t) {
 359                 mutex_unlock(&dev->mlock);
 360                 return 1;
 361         }
 362         __nvm_remove_target(t);
 363         mutex_unlock(&dev->mlock);
 364
 365         return 0;
 366 }
 367
 368 static int nvm_register_map(struct nvm_dev *dev)
 369 {
 370         struct nvm_dev_map *rmap;
 371         int i, j;
 372
 373         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 374         if (!rmap)
 375                 goto err_rmap;
 376
 377         rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct nvm_ch_map),
 378                                                                 GFP_KERNEL);
 379         if (!rmap->chnls)
 380                 goto err_chnls;
 381
 382         for (i = 0; i < dev->geo.nr_chnls; i++) {
 383                 struct nvm_ch_map *ch_rmap;
 384                 int *lun_roffs;
 385                 int luns_in_chnl = dev->geo.luns_per_chnl;
 386
 387                 ch_rmap = &rmap->chnls[i];
 388
 389                 ch_rmap->ch_off = -1;
 390                 ch_rmap->nr_luns = luns_in_chnl;
 391
 392                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 393                 if (!lun_roffs)
 394                         goto err_ch;
 395
 396                 for (j = 0; j < luns_in_chnl; j++)
 397                         lun_roffs[j] = -1;
 398
 399                 ch_rmap->lun_offs = lun_roffs;
 400         }
 401
 402         dev->rmap = rmap;
 403
 404         return 0;
 405 err_ch:
 406         while (--i >= 0)
 407                 kfree(rmap->chnls[i].lun_offs);
 408 err_chnls:
 409         kfree(rmap);
 410 err_rmap:
 411         return -ENOMEM;
 412 }
 413
 414 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 415 {
 416         struct nvm_dev_map *dev_map = tgt_dev->map;
 417         struct nvm_ch_map *ch_map = &dev_map->chnls[p->g.ch];
 418         int lun_off = ch_map->lun_offs[p->g.lun];
 419
 420         p->g.ch += ch_map->ch_off;
 421         p->g.lun += lun_off;
 422 }
 423
 424 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 425 {
 426         struct nvm_dev *dev = tgt_dev->parent;
 427         struct nvm_dev_map *dev_rmap = dev->rmap;
 428         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
 429         int lun_roff = ch_rmap->lun_offs[p->g.lun];
 430
 431         p->g.ch -= ch_rmap->ch_off;
 432         p->g.lun -= lun_roff;
 433 }
 434
 435 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 436                                 struct ppa_addr *ppa_list, int nr_ppas)
 437 {
 438         int i;
 439
 440         for (i = 0; i < nr_ppas; i++) {
 441                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 442                 ppa_list[i] = generic_to_dev_addr(tgt_dev, ppa_list[i]);
 443         }
 444 }
 445
 446 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 447                                 struct ppa_addr *ppa_list, int nr_ppas)
 448 {
 449         int i;
 450
 451         for (i = 0; i < nr_ppas; i++) {
 452                 ppa_list[i] = dev_to_generic_addr(tgt_dev, ppa_list[i]);
 453                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 454         }
 455 }
 456
 457 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 458 {
 459         if (rqd->nr_ppas == 1) {
 460                 nvm_ppa_tgt_to_dev(tgt_dev, &rqd->ppa_addr, 1);
 461                 return;
 462         }
 463
 464         nvm_ppa_tgt_to_dev(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 465 }
 466
 467 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 468 {
 469         if (rqd->nr_ppas == 1) {
 470                 nvm_ppa_dev_to_tgt(tgt_dev, &rqd->ppa_addr, 1);
 471                 return;
 472         }
 473
 474         nvm_ppa_dev_to_tgt(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 475 }
 476
 477 void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
 478                      int len)
 479 {
 480         struct nvm_geo *geo = &dev->geo;
 481         struct nvm_dev_map *dev_rmap = dev->rmap;
 482         u64 i;
 483
 484         for (i = 0; i < len; i++) {
 485                 struct nvm_ch_map *ch_rmap;
 486                 int *lun_roffs;
 487                 struct ppa_addr gaddr;
 488                 u64 pba = le64_to_cpu(entries[i]);
 489                 int off;
 490                 u64 diff;
 491
 492                 if (!pba)
 493                         continue;
 494
 495                 gaddr = linear_to_generic_addr(geo, pba);
 496                 ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
 497                 lun_roffs = ch_rmap->lun_offs;
 498
 499                 off = gaddr.g.ch * geo->luns_per_chnl + gaddr.g.lun;
 500
 501                 diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
 502                                 (lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
 503
 504                 entries[i] -= cpu_to_le64(diff);
 505         }
 506 }
 507 EXPORT_SYMBOL(nvm_part_to_tgt);
 508
 509 struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
 510 {
 511         struct nvm_tgt_type *tmp, *tt = NULL;
 512
 513         if (lock)
 514                 down_write(&nvm_tgtt_lock);
 515
 516         list_for_each_entry(tmp, &nvm_tgt_types, list)
 517                 if (!strcmp(name, tmp->name)) {
 518                         tt = tmp;
 519                         break;
 520                 }
 521
 522         if (lock)
 523                 up_write(&nvm_tgtt_lock);
 524         return tt;
 525 }
 526 EXPORT_SYMBOL(nvm_find_target_type);
 527
 528 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 529 {
 530         int ret = 0;
 531
 532         down_write(&nvm_tgtt_lock);
 533         if (nvm_find_target_type(tt->name, 0))
 534                 ret = -EEXIST;
 535         else
 536                 list_add(&tt->list, &nvm_tgt_types);
 537         up_write(&nvm_tgtt_lock);
 538
 539         return ret;
 540 }
 541 EXPORT_SYMBOL(nvm_register_tgt_type);
 542
 543 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 544 {
 545         if (!tt)
 546                 return;
 547
 548         down_write(&nvm_lock);
 549         list_del(&tt->list);
 550         up_write(&nvm_lock);
 551 }
 552 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 553
 554 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 555                                                         dma_addr_t *dma_handler)
 556 {
 557         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 558                                                                 dma_handler);
 559 }
 560 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 561
 562 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 563 {
 564         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 565 }
 566 EXPORT_SYMBOL(nvm_dev_dma_free);
 567
 568 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 569 {
 570         struct nvm_dev *dev;
 571
 572         list_for_each_entry(dev, &nvm_devices, devices)
 573                 if (!strcmp(name, dev->name))
 574                         return dev;
 575
 576         return NULL;
 577 }
 578
 579 int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 580                        int nr_ppas, int type)
 581 {
 582         struct nvm_dev *dev = tgt_dev->parent;
 583         struct nvm_rq rqd;
 584         int ret;
 585
 586         if (nr_ppas > dev->ops->max_phys_sect) {
 587                 pr_err("nvm: unable to update all blocks atomically\n");
 588                 return -EINVAL;
 589         }
 590
 591         memset(&rqd, 0, sizeof(struct nvm_rq));
 592
 593         nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas, 1);
 594         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
 595
 596         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
 597         nvm_free_rqd_ppalist(dev, &rqd);
 598         if (ret) {
 599                 pr_err("nvm: failed bb mark\n");
 600                 return -EINVAL;
 601         }
 602
 603         return 0;
 604 }
 605 EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
 606
 607 int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
 608 {
 609         struct nvm_dev *dev = tgt_dev->parent;
 610
 611         return dev->ops->max_phys_sect;
 612 }
 613 EXPORT_SYMBOL(nvm_max_phys_sects);
 614
 615 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 616 {
 617         struct nvm_dev *dev = tgt_dev->parent;
 618
 619         if (!dev->ops->submit_io)
 620                 return -ENODEV;
 621
 622         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 623
 624         rqd->dev = tgt_dev;
 625         return dev->ops->submit_io(dev, rqd);
 626 }
 627 EXPORT_SYMBOL(nvm_submit_io);
 628
 629 int nvm_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int flags)
 630 {
 631         struct nvm_dev *dev = tgt_dev->parent;
 632         struct nvm_rq rqd;
 633         int ret;
 634
 635         if (!dev->ops->erase_block)
 636                 return 0;
 637
 638         nvm_map_to_dev(tgt_dev, ppas);
 639
 640         memset(&rqd, 0, sizeof(struct nvm_rq));
 641
 642         ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, 1, 1);
 643         if (ret)
 644                 return ret;
 645
 646         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
 647
 648         rqd.flags = flags;
 649
 650         ret = dev->ops->erase_block(dev, &rqd);
 651
 652         nvm_free_rqd_ppalist(dev, &rqd);
 653
 654         return ret;
 655 }
 656 EXPORT_SYMBOL(nvm_erase_blk);
 657
 658 int nvm_get_l2p_tbl(struct nvm_tgt_dev *tgt_dev, u64 slba, u32 nlb,
 659                     nvm_l2p_update_fn *update_l2p, void *priv)
 660 {
 661         struct nvm_dev *dev = tgt_dev->parent;
 662
 663         if (!dev->ops->get_l2p_tbl)
 664                 return 0;
 665
 666         return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
 667 }
 668 EXPORT_SYMBOL(nvm_get_l2p_tbl);
 669
 670 int nvm_get_area(struct nvm_tgt_dev *tgt_dev, sector_t *lba, sector_t len)
 671 {
 672         struct nvm_dev *dev = tgt_dev->parent;
 673         struct nvm_geo *geo = &dev->geo;
 674         struct nvm_area *area, *prev, *next;
 675         sector_t begin = 0;
 676         sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9;
 677
 678         if (len > max_sectors)
 679                 return -EINVAL;
 680
 681         area = kmalloc(sizeof(struct nvm_area), GFP_KERNEL);
 682         if (!area)
 683                 return -ENOMEM;
 684
 685         prev = NULL;
 686
 687         spin_lock(&dev->lock);
 688         list_for_each_entry(next, &dev->area_list, list) {
 689                 if (begin + len > next->begin) {
 690                         begin = next->end;
 691                         prev = next;
 692                         continue;
 693                 }
 694                 break;
 695         }
 696
 697         if ((begin + len) > max_sectors) {
 698                 spin_unlock(&dev->lock);
 699                 kfree(area);
 700                 return -EINVAL;
 701         }
 702
 703         area->begin = *lba = begin;
 704         area->end = begin + len;
 705
 706         if (prev) /* insert into sorted order */
 707                 list_add(&area->list, &prev->list);
 708         else
 709                 list_add(&area->list, &dev->area_list);
 710         spin_unlock(&dev->lock);
 711
 712         return 0;
 713 }
 714 EXPORT_SYMBOL(nvm_get_area);
 715
 716 void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin)
 717 {
 718         struct nvm_dev *dev = tgt_dev->parent;
 719         struct nvm_area *area;
 720
 721         spin_lock(&dev->lock);
 722         list_for_each_entry(area, &dev->area_list, list) {
 723                 if (area->begin != begin)
 724                         continue;
 725
 726                 list_del(&area->list);
 727                 spin_unlock(&dev->lock);
 728                 kfree(area);
 729                 return;
 730         }
 731         spin_unlock(&dev->lock);
 732 }
 733 EXPORT_SYMBOL(nvm_put_area);
 734
 735 int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
 736                         const struct ppa_addr *ppas, int nr_ppas, int vblk)
 737 {
 738         struct nvm_geo *geo = &dev->geo;
 739         int i, plane_cnt, pl_idx;
 740         struct ppa_addr ppa;
 741
 742         if ((!vblk || geo->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) {
 743                 rqd->nr_ppas = nr_ppas;
 744                 rqd->ppa_addr = ppas[0];
 745
 746                 return 0;
 747         }
 748
 749         rqd->nr_ppas = nr_ppas;
 750         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 751         if (!rqd->ppa_list) {
 752                 pr_err("nvm: failed to allocate dma memory\n");
 753                 return -ENOMEM;
 754         }
 755
 756         if (!vblk) {
 757                 for (i = 0; i < nr_ppas; i++)
 758                         rqd->ppa_list[i] = ppas[i];
 759         } else {
 760                 plane_cnt = geo->plane_mode;
 761                 rqd->nr_ppas *= plane_cnt;
 762
 763                 for (i = 0; i < nr_ppas; i++) {
 764                         for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 765                                 ppa = ppas[i];
 766                                 ppa.g.pl = pl_idx;
 767                                 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 768                         }
 769                 }
 770         }
 771
 772         return 0;
 773 }
 774 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
 775
 776 void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
 777 {
 778         if (!rqd->ppa_list)
 779                 return;
 780
 781         nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
 782 }
 783 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
 784
 785 void nvm_end_io(struct nvm_rq *rqd)
 786 {
 787         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 788
 789         /* Convert address space */
 790         if (tgt_dev)
 791                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 792
 793         if (rqd->end_io)
 794                 rqd->end_io(rqd);
 795 }
 796 EXPORT_SYMBOL(nvm_end_io);
 797
 798 /*
 799  * folds a bad block list from its plane representation to its virtual
 800  * block representation. The fold is done in place and reduced size is
 801  * returned.
 802  *
 803  * If any of the planes status are bad or grown bad block, the virtual block
 804  * is marked bad. If not bad, the first plane state acts as the block state.
 805  */
 806 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 807 {
 808         struct nvm_geo *geo = &dev->geo;
 809         int blk, offset, pl, blktype;
 810
 811         if (nr_blks != geo->blks_per_lun * geo->plane_mode)
 812                 return -EINVAL;
 813
 814         for (blk = 0; blk < geo->blks_per_lun; blk++) {
 815                 offset = blk * geo->plane_mode;
 816                 blktype = blks[offset];
 817
 818                 /* Bad blocks on any planes take precedence over other types */
 819                 for (pl = 0; pl < geo->plane_mode; pl++) {
 820                         if (blks[offset + pl] &
 821                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 822                                 blktype = blks[offset + pl];
 823                                 break;
 824                         }
 825                 }
 826
 827                 blks[blk] = blktype;
 828         }
 829
 830         return geo->blks_per_lun;
 831 }
 832 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 833
 834 int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 835                        u8 *blks)
 836 {
 837         struct nvm_dev *dev = tgt_dev->parent;
 838
 839         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
 840
 841         return dev->ops->get_bb_tbl(dev, ppa, blks);
 842 }
 843 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 844
 845 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 846 {
 847         struct nvm_geo *geo = &dev->geo;
 848         int i;
 849
 850         dev->lps_per_blk = geo->pgs_per_blk;
 851         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 852         if (!dev->lptbl)
 853                 return -ENOMEM;
 854
 855         /* Just a linear array */
 856         for (i = 0; i < dev->lps_per_blk; i++)
 857                 dev->lptbl[i] = i;
 858
 859         return 0;
 860 }
 861
 862 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 863 {
 864         int i, p;
 865         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 866
 867         if (!mlc->num_pairs)
 868                 return 0;
 869
 870         dev->lps_per_blk = mlc->num_pairs;
 871         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 872         if (!dev->lptbl)
 873                 return -ENOMEM;
 874
 875         /* The lower page table encoding consists of a list of bytes, where each
 876          * has a lower and an upper half. The first half byte maintains the
 877          * increment value and every value after is an offset added to the
 878          * previous incrementation value
 879          */
 880         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 881         for (i = 1; i < dev->lps_per_blk; i++) {
 882                 p = mlc->pairs[i >> 1];
 883                 if (i & 0x1) /* upper */
 884                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 885                 else /* lower */
 886                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 887         }
 888
 889         return 0;
 890 }
 891
 892 static int nvm_core_init(struct nvm_dev *dev)
 893 {
 894         struct nvm_id *id = &dev->identity;
 895         struct nvm_id_group *grp = &id->grp;
 896         struct nvm_geo *geo = &dev->geo;
 897         int ret;
 898
 899         /* Whole device values */
 900         geo->nr_chnls = grp->num_ch;
 901         geo->luns_per_chnl = grp->num_lun;
 902
 903         /* Generic device values */
 904         geo->pgs_per_blk = grp->num_pg;
 905         geo->blks_per_lun = grp->num_blk;
 906         geo->nr_planes = grp->num_pln;
 907         geo->fpg_size = grp->fpg_sz;
 908         geo->pfpg_size = grp->fpg_sz * grp->num_pln;
 909         geo->sec_size = grp->csecs;
 910         geo->oob_size = grp->sos;
 911         geo->sec_per_pg = grp->fpg_sz / grp->csecs;
 912         geo->mccap = grp->mccap;
 913         memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 914
 915         geo->plane_mode = NVM_PLANE_SINGLE;
 916         geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
 917
 918         if (grp->mpos & 0x020202)
 919                 geo->plane_mode = NVM_PLANE_DOUBLE;
 920         if (grp->mpos & 0x040404)
 921                 geo->plane_mode = NVM_PLANE_QUAD;
 922
 923         if (grp->mtype != 0) {
 924                 pr_err("nvm: memory type not supported\n");
 925                 return -EINVAL;
 926         }
 927
 928         /* calculated values */
 929         geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
 930         geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
 931         geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
 932         geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
 933
 934         dev->total_secs = geo->nr_luns * geo->sec_per_lun;
 935         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->nr_luns),
 936                                         sizeof(unsigned long), GFP_KERNEL);
 937         if (!dev->lun_map)
 938                 return -ENOMEM;
 939
 940         switch (grp->fmtype) {
 941         case NVM_ID_FMTYPE_SLC:
 942                 if (nvm_init_slc_tbl(dev, grp)) {
 943                         ret = -ENOMEM;
 944                         goto err_fmtype;
 945                 }
 946                 break;
 947         case NVM_ID_FMTYPE_MLC:
 948                 if (nvm_init_mlc_tbl(dev, grp)) {
 949                         ret = -ENOMEM;
 950                         goto err_fmtype;
 951                 }
 952                 break;
 953         default:
 954                 pr_err("nvm: flash type not supported\n");
 955                 ret = -EINVAL;
 956                 goto err_fmtype;
 957         }
 958
 959         INIT_LIST_HEAD(&dev->area_list);
 960         INIT_LIST_HEAD(&dev->targets);
 961         mutex_init(&dev->mlock);
 962         spin_lock_init(&dev->lock);
 963
 964         ret = nvm_register_map(dev);
 965         if (ret)
 966                 goto err_fmtype;
 967
 968         blk_queue_logical_block_size(dev->q, geo->sec_size);
 969         return 0;
 970 err_fmtype:
 971         kfree(dev->lun_map);
 972         return ret;
 973 }
 974
 975 void nvm_free(struct nvm_dev *dev)
 976 {
 977         if (!dev)
 978                 return;
 979
 980         if (dev->dma_pool)
 981                 dev->ops->destroy_dma_pool(dev->dma_pool);
 982
 983         kfree(dev->rmap);
 984         kfree(dev->lptbl);
 985         kfree(dev->lun_map);
 986         kfree(dev);
 987 }
 988
 989 static int nvm_init(struct nvm_dev *dev)
 990 {
 991         struct nvm_geo *geo = &dev->geo;
 992         int ret = -EINVAL;
 993
 994         if (dev->ops->identity(dev, &dev->identity)) {
 995                 pr_err("nvm: device could not be identified\n");
 996                 goto err;
 997         }
 998
 999         pr_debug("nvm: ver:%x nvm_vendor:%x\n",
1000                         dev->identity.ver_id, dev->identity.vmnt);
1001
1002         if (dev->identity.ver_id != 1) {
1003                 pr_err("nvm: device not supported by kernel.");
1004                 goto err;
1005         }
1006
1007         ret = nvm_core_init(dev);
1008         if (ret) {
1009                 pr_err("nvm: could not initialize core structures.\n");
1010                 goto err;
1011         }
1012
1013         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
1014                         dev->name, geo->sec_per_pg, geo->nr_planes,
1015                         geo->pgs_per_blk, geo->blks_per_lun,
1016                         geo->nr_luns, geo->nr_chnls);
1017         return 0;
1018 err:
1019         pr_err("nvm: failed to initialize nvm\n");
1020         return ret;
1021 }
1022
1023 struct nvm_dev *nvm_alloc_dev(int node)
1024 {
1025         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1026 }
1027 EXPORT_SYMBOL(nvm_alloc_dev);
1028
1029 int nvm_register(struct nvm_dev *dev)
1030 {
1031         int ret;
1032
1033         if (!dev->q || !dev->ops)
1034                 return -EINVAL;
1035
1036         if (dev->ops->max_phys_sect > 256) {
1037                 pr_info("nvm: max sectors supported is 256.\n");
1038                 return -EINVAL;
1039         }
1040
1041         if (dev->ops->max_phys_sect > 1) {
1042                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1043                 if (!dev->dma_pool) {
1044                         pr_err("nvm: could not create dma pool\n");
1045                         return -ENOMEM;
1046                 }
1047         }
1048
1049         ret = nvm_init(dev);
1050         if (ret)
1051                 goto err_init;
1052
1053         /* register device with a supported media manager */
1054         down_write(&nvm_lock);
1055         list_add(&dev->devices, &nvm_devices);
1056         up_write(&nvm_lock);
1057
1058         return 0;
1059 err_init:
1060         dev->ops->destroy_dma_pool(dev->dma_pool);
1061         return ret;
1062 }
1063 EXPORT_SYMBOL(nvm_register);
1064
1065 void nvm_unregister(struct nvm_dev *dev)
1066 {
1067         struct nvm_target *t, *tmp;
1068
1069         mutex_lock(&dev->mlock);
1070         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1071                 if (t->dev->parent != dev)
1072                         continue;
1073                 __nvm_remove_target(t);
1074         }
1075         mutex_unlock(&dev->mlock);
1076
1077         down_write(&nvm_lock);
1078         list_del(&dev->devices);
1079         up_write(&nvm_lock);
1080
1081         nvm_free(dev);
1082 }
1083 EXPORT_SYMBOL(nvm_unregister);
1084
1085 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1086 {
1087         struct nvm_dev *dev;
1088         struct nvm_ioctl_create_simple *s;
1089
1090         down_write(&nvm_lock);
1091         dev = nvm_find_nvm_dev(create->dev);
1092         up_write(&nvm_lock);
1093
1094         if (!dev) {
1095                 pr_err("nvm: device not found\n");
1096                 return -EINVAL;
1097         }
1098
1099         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
1100                 pr_err("nvm: config type not valid\n");
1101                 return -EINVAL;
1102         }
1103         s = &create->conf.s;
1104
1105         if (s->lun_begin > s->lun_end || s->lun_end > dev->geo.nr_luns) {
1106                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
1107                         s->lun_begin, s->lun_end, dev->geo.nr_luns);
1108                 return -EINVAL;
1109         }
1110
1111         return nvm_create_tgt(dev, create);
1112 }
1113
1114 static long nvm_ioctl_info(struct file *file, void __user *arg)
1115 {
1116         struct nvm_ioctl_info *info;
1117         struct nvm_tgt_type *tt;
1118         int tgt_iter = 0;
1119
1120         if (!capable(CAP_SYS_ADMIN))
1121                 return -EPERM;
1122
1123         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1124         if (IS_ERR(info))
1125                 return -EFAULT;
1126
1127         info->version[0] = NVM_VERSION_MAJOR;
1128         info->version[1] = NVM_VERSION_MINOR;
1129         info->version[2] = NVM_VERSION_PATCH;
1130
1131         down_write(&nvm_lock);
1132         list_for_each_entry(tt, &nvm_tgt_types, list) {
1133                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1134
1135                 tgt->version[0] = tt->version[0];
1136                 tgt->version[1] = tt->version[1];
1137                 tgt->version[2] = tt->version[2];
1138                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1139
1140                 tgt_iter++;
1141         }
1142
1143         info->tgtsize = tgt_iter;
1144         up_write(&nvm_lock);
1145
1146         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1147                 kfree(info);
1148                 return -EFAULT;
1149         }
1150
1151         kfree(info);
1152         return 0;
1153 }
1154
1155 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1156 {
1157         struct nvm_ioctl_get_devices *devices;
1158         struct nvm_dev *dev;
1159         int i = 0;
1160
1161         if (!capable(CAP_SYS_ADMIN))
1162                 return -EPERM;
1163
1164         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1165         if (!devices)
1166                 return -ENOMEM;
1167
1168         down_write(&nvm_lock);
1169         list_for_each_entry(dev, &nvm_devices, devices) {
1170                 struct nvm_ioctl_device_info *info = &devices->info[i];
1171
1172                 sprintf(info->devname, "%s", dev->name);
1173
1174                 /* kept for compatibility */
1175                 info->bmversion[0] = 1;
1176                 info->bmversion[1] = 0;
1177                 info->bmversion[2] = 0;
1178                 sprintf(info->bmname, "%s", "gennvm");
1179                 i++;
1180
1181                 if (i > 31) {
1182                         pr_err("nvm: max 31 devices can be reported.\n");
1183                         break;
1184                 }
1185         }
1186         up_write(&nvm_lock);
1187
1188         devices->nr_devices = i;
1189
1190         if (copy_to_user(arg, devices,
1191                          sizeof(struct nvm_ioctl_get_devices))) {
1192                 kfree(devices);
1193                 return -EFAULT;
1194         }
1195
1196         kfree(devices);
1197         return 0;
1198 }
1199
1200 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1201 {
1202         struct nvm_ioctl_create create;
1203
1204         if (!capable(CAP_SYS_ADMIN))
1205                 return -EPERM;
1206
1207         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1208                 return -EFAULT;
1209
1210         create.dev[DISK_NAME_LEN - 1] = '\0';
1211         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1212         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1213
1214         if (create.flags != 0) {
1215                 pr_err("nvm: no flags supported\n");
1216                 return -EINVAL;
1217         }
1218
1219         return __nvm_configure_create(&create);
1220 }
1221
1222 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1223 {
1224         struct nvm_ioctl_remove remove;
1225         struct nvm_dev *dev;
1226         int ret = 0;
1227
1228         if (!capable(CAP_SYS_ADMIN))
1229                 return -EPERM;
1230
1231         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1232                 return -EFAULT;
1233
1234         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1235
1236         if (remove.flags != 0) {
1237                 pr_err("nvm: no flags supported\n");
1238                 return -EINVAL;
1239         }
1240
1241         list_for_each_entry(dev, &nvm_devices, devices) {
1242                 ret = nvm_remove_tgt(dev, &remove);
1243                 if (!ret)
1244                         break;
1245         }
1246
1247         return ret;
1248 }
1249
1250 /* kept for compatibility reasons */
1251 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1252 {
1253         struct nvm_ioctl_dev_init init;
1254
1255         if (!capable(CAP_SYS_ADMIN))
1256                 return -EPERM;
1257
1258         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1259                 return -EFAULT;
1260
1261         if (init.flags != 0) {
1262                 pr_err("nvm: no flags supported\n");
1263                 return -EINVAL;
1264         }
1265
1266         return 0;
1267 }
1268
1269 /* Kept for compatibility reasons */
1270 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1271 {
1272         struct nvm_ioctl_dev_factory fact;
1273
1274         if (!capable(CAP_SYS_ADMIN))
1275                 return -EPERM;
1276
1277         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1278                 return -EFAULT;
1279
1280         fact.dev[DISK_NAME_LEN - 1] = '\0';
1281
1282         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1283                 return -EINVAL;
1284
1285         return 0;
1286 }
1287
1288 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1289 {
1290         void __user *argp = (void __user *)arg;
1291
1292         switch (cmd) {
1293         case NVM_INFO:
1294                 return nvm_ioctl_info(file, argp);
1295         case NVM_GET_DEVICES:
1296                 return nvm_ioctl_get_devices(file, argp);
1297         case NVM_DEV_CREATE:
1298                 return nvm_ioctl_dev_create(file, argp);
1299         case NVM_DEV_REMOVE:
1300                 return nvm_ioctl_dev_remove(file, argp);
1301         case NVM_DEV_INIT:
1302                 return nvm_ioctl_dev_init(file, argp);
1303         case NVM_DEV_FACTORY:
1304                 return nvm_ioctl_dev_factory(file, argp);
1305         }
1306         return 0;
1307 }
1308
1309 static const struct file_operations _ctl_fops = {
1310         .open = nonseekable_open,
1311         .unlocked_ioctl = nvm_ctl_ioctl,
1312         .owner = THIS_MODULE,
1313         .llseek  = noop_llseek,
1314 };
1315
1316 static struct miscdevice _nvm_misc = {
1317         .minor          = MISC_DYNAMIC_MINOR,
1318         .name           = "lightnvm",
1319         .nodename       = "lightnvm/control",
1320         .fops           = &_ctl_fops,
1321 };
1322 builtin_misc_device(_nvm_misc);