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_unregister_map(struct nvm_dev *dev)
 415 {
 416         struct nvm_dev_map *rmap = dev->rmap;
 417         int i;
 418
 419         for (i = 0; i < dev->geo.nr_chnls; i++)
 420                 kfree(rmap->chnls[i].lun_offs);
 421
 422         kfree(rmap->chnls);
 423         kfree(rmap);
 424 }
 425
 426 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 427 {
 428         struct nvm_dev_map *dev_map = tgt_dev->map;
 429         struct nvm_ch_map *ch_map = &dev_map->chnls[p->g.ch];
 430         int lun_off = ch_map->lun_offs[p->g.lun];
 431
 432         p->g.ch += ch_map->ch_off;
 433         p->g.lun += lun_off;
 434 }
 435
 436 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 437 {
 438         struct nvm_dev *dev = tgt_dev->parent;
 439         struct nvm_dev_map *dev_rmap = dev->rmap;
 440         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
 441         int lun_roff = ch_rmap->lun_offs[p->g.lun];
 442
 443         p->g.ch -= ch_rmap->ch_off;
 444         p->g.lun -= lun_roff;
 445 }
 446
 447 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 448                                 struct ppa_addr *ppa_list, int nr_ppas)
 449 {
 450         int i;
 451
 452         for (i = 0; i < nr_ppas; i++) {
 453                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 454                 ppa_list[i] = generic_to_dev_addr(tgt_dev, ppa_list[i]);
 455         }
 456 }
 457
 458 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 459                                 struct ppa_addr *ppa_list, int nr_ppas)
 460 {
 461         int i;
 462
 463         for (i = 0; i < nr_ppas; i++) {
 464                 ppa_list[i] = dev_to_generic_addr(tgt_dev, ppa_list[i]);
 465                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 466         }
 467 }
 468
 469 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 470 {
 471         if (rqd->nr_ppas == 1) {
 472                 nvm_ppa_tgt_to_dev(tgt_dev, &rqd->ppa_addr, 1);
 473                 return;
 474         }
 475
 476         nvm_ppa_tgt_to_dev(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 477 }
 478
 479 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 480 {
 481         if (rqd->nr_ppas == 1) {
 482                 nvm_ppa_dev_to_tgt(tgt_dev, &rqd->ppa_addr, 1);
 483                 return;
 484         }
 485
 486         nvm_ppa_dev_to_tgt(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 487 }
 488
 489 void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
 490                      int len)
 491 {
 492         struct nvm_geo *geo = &dev->geo;
 493         struct nvm_dev_map *dev_rmap = dev->rmap;
 494         u64 i;
 495
 496         for (i = 0; i < len; i++) {
 497                 struct nvm_ch_map *ch_rmap;
 498                 int *lun_roffs;
 499                 struct ppa_addr gaddr;
 500                 u64 pba = le64_to_cpu(entries[i]);
 501                 int off;
 502                 u64 diff;
 503
 504                 if (!pba)
 505                         continue;
 506
 507                 gaddr = linear_to_generic_addr(geo, pba);
 508                 ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
 509                 lun_roffs = ch_rmap->lun_offs;
 510
 511                 off = gaddr.g.ch * geo->luns_per_chnl + gaddr.g.lun;
 512
 513                 diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
 514                                 (lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
 515
 516                 entries[i] -= cpu_to_le64(diff);
 517         }
 518 }
 519 EXPORT_SYMBOL(nvm_part_to_tgt);
 520
 521 struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
 522 {
 523         struct nvm_tgt_type *tmp, *tt = NULL;
 524
 525         if (lock)
 526                 down_write(&nvm_tgtt_lock);
 527
 528         list_for_each_entry(tmp, &nvm_tgt_types, list)
 529                 if (!strcmp(name, tmp->name)) {
 530                         tt = tmp;
 531                         break;
 532                 }
 533
 534         if (lock)
 535                 up_write(&nvm_tgtt_lock);
 536         return tt;
 537 }
 538 EXPORT_SYMBOL(nvm_find_target_type);
 539
 540 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 541 {
 542         int ret = 0;
 543
 544         down_write(&nvm_tgtt_lock);
 545         if (nvm_find_target_type(tt->name, 0))
 546                 ret = -EEXIST;
 547         else
 548                 list_add(&tt->list, &nvm_tgt_types);
 549         up_write(&nvm_tgtt_lock);
 550
 551         return ret;
 552 }
 553 EXPORT_SYMBOL(nvm_register_tgt_type);
 554
 555 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 556 {
 557         if (!tt)
 558                 return;
 559
 560         down_write(&nvm_lock);
 561         list_del(&tt->list);
 562         up_write(&nvm_lock);
 563 }
 564 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 565
 566 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 567                                                         dma_addr_t *dma_handler)
 568 {
 569         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 570                                                                 dma_handler);
 571 }
 572 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 573
 574 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 575 {
 576         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 577 }
 578 EXPORT_SYMBOL(nvm_dev_dma_free);
 579
 580 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 581 {
 582         struct nvm_dev *dev;
 583
 584         list_for_each_entry(dev, &nvm_devices, devices)
 585                 if (!strcmp(name, dev->name))
 586                         return dev;
 587
 588         return NULL;
 589 }
 590
 591 int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 592                        int nr_ppas, int type)
 593 {
 594         struct nvm_dev *dev = tgt_dev->parent;
 595         struct nvm_rq rqd;
 596         int ret;
 597
 598         if (nr_ppas > dev->ops->max_phys_sect) {
 599                 pr_err("nvm: unable to update all blocks atomically\n");
 600                 return -EINVAL;
 601         }
 602
 603         memset(&rqd, 0, sizeof(struct nvm_rq));
 604
 605         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas, 1);
 606         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
 607
 608         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
 609         nvm_free_rqd_ppalist(tgt_dev, &rqd);
 610         if (ret) {
 611                 pr_err("nvm: failed bb mark\n");
 612                 return -EINVAL;
 613         }
 614
 615         return 0;
 616 }
 617 EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
 618
 619 int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
 620 {
 621         struct nvm_dev *dev = tgt_dev->parent;
 622
 623         return dev->ops->max_phys_sect;
 624 }
 625 EXPORT_SYMBOL(nvm_max_phys_sects);
 626
 627 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 628 {
 629         struct nvm_dev *dev = tgt_dev->parent;
 630
 631         if (!dev->ops->submit_io)
 632                 return -ENODEV;
 633
 634         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 635
 636         rqd->dev = tgt_dev;
 637         return dev->ops->submit_io(dev, rqd);
 638 }
 639 EXPORT_SYMBOL(nvm_submit_io);
 640
 641 static void nvm_end_io_sync(struct nvm_rq *rqd)
 642 {
 643         struct completion *waiting = rqd->private;
 644
 645         complete(waiting);
 646 }
 647
 648 int nvm_erase_sync(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 649                                                                 int nr_ppas)
 650 {
 651         struct nvm_geo *geo = &tgt_dev->geo;
 652         struct nvm_rq rqd;
 653         int ret;
 654         DECLARE_COMPLETION_ONSTACK(wait);
 655
 656         memset(&rqd, 0, sizeof(struct nvm_rq));
 657
 658         rqd.opcode = NVM_OP_ERASE;
 659         rqd.end_io = nvm_end_io_sync;
 660         rqd.private = &wait;
 661         rqd.flags = geo->plane_mode >> 1;
 662
 663         ret = nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas, 1);
 664         if (ret)
 665                 return ret;
 666
 667         ret = nvm_submit_io(tgt_dev, &rqd);
 668         if (ret) {
 669                 pr_err("rrpr: erase I/O submission failed: %d\n", ret);
 670                 goto free_ppa_list;
 671         }
 672         wait_for_completion_io(&wait);
 673
 674 free_ppa_list:
 675         nvm_free_rqd_ppalist(tgt_dev, &rqd);
 676
 677         return ret;
 678 }
 679 EXPORT_SYMBOL(nvm_erase_sync);
 680
 681 int nvm_get_l2p_tbl(struct nvm_tgt_dev *tgt_dev, u64 slba, u32 nlb,
 682                     nvm_l2p_update_fn *update_l2p, void *priv)
 683 {
 684         struct nvm_dev *dev = tgt_dev->parent;
 685
 686         if (!dev->ops->get_l2p_tbl)
 687                 return 0;
 688
 689         return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
 690 }
 691 EXPORT_SYMBOL(nvm_get_l2p_tbl);
 692
 693 int nvm_get_area(struct nvm_tgt_dev *tgt_dev, sector_t *lba, sector_t len)
 694 {
 695         struct nvm_dev *dev = tgt_dev->parent;
 696         struct nvm_geo *geo = &dev->geo;
 697         struct nvm_area *area, *prev, *next;
 698         sector_t begin = 0;
 699         sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9;
 700
 701         if (len > max_sectors)
 702                 return -EINVAL;
 703
 704         area = kmalloc(sizeof(struct nvm_area), GFP_KERNEL);
 705         if (!area)
 706                 return -ENOMEM;
 707
 708         prev = NULL;
 709
 710         spin_lock(&dev->lock);
 711         list_for_each_entry(next, &dev->area_list, list) {
 712                 if (begin + len > next->begin) {
 713                         begin = next->end;
 714                         prev = next;
 715                         continue;
 716                 }
 717                 break;
 718         }
 719
 720         if ((begin + len) > max_sectors) {
 721                 spin_unlock(&dev->lock);
 722                 kfree(area);
 723                 return -EINVAL;
 724         }
 725
 726         area->begin = *lba = begin;
 727         area->end = begin + len;
 728
 729         if (prev) /* insert into sorted order */
 730                 list_add(&area->list, &prev->list);
 731         else
 732                 list_add(&area->list, &dev->area_list);
 733         spin_unlock(&dev->lock);
 734
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(nvm_get_area);
 738
 739 void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin)
 740 {
 741         struct nvm_dev *dev = tgt_dev->parent;
 742         struct nvm_area *area;
 743
 744         spin_lock(&dev->lock);
 745         list_for_each_entry(area, &dev->area_list, list) {
 746                 if (area->begin != begin)
 747                         continue;
 748
 749                 list_del(&area->list);
 750                 spin_unlock(&dev->lock);
 751                 kfree(area);
 752                 return;
 753         }
 754         spin_unlock(&dev->lock);
 755 }
 756 EXPORT_SYMBOL(nvm_put_area);
 757
 758 int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 759                         const struct ppa_addr *ppas, int nr_ppas, int vblk)
 760 {
 761         struct nvm_dev *dev = tgt_dev->parent;
 762         struct nvm_geo *geo = &tgt_dev->geo;
 763         int i, plane_cnt, pl_idx;
 764         struct ppa_addr ppa;
 765
 766         if ((!vblk || geo->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) {
 767                 rqd->nr_ppas = nr_ppas;
 768                 rqd->ppa_addr = ppas[0];
 769
 770                 return 0;
 771         }
 772
 773         rqd->nr_ppas = nr_ppas;
 774         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 775         if (!rqd->ppa_list) {
 776                 pr_err("nvm: failed to allocate dma memory\n");
 777                 return -ENOMEM;
 778         }
 779
 780         if (!vblk) {
 781                 for (i = 0; i < nr_ppas; i++)
 782                         rqd->ppa_list[i] = ppas[i];
 783         } else {
 784                 plane_cnt = geo->plane_mode;
 785                 rqd->nr_ppas *= plane_cnt;
 786
 787                 for (i = 0; i < nr_ppas; i++) {
 788                         for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 789                                 ppa = ppas[i];
 790                                 ppa.g.pl = pl_idx;
 791                                 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 792                         }
 793                 }
 794         }
 795
 796         return 0;
 797 }
 798 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
 799
 800 void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 801 {
 802         if (!rqd->ppa_list)
 803                 return;
 804
 805         nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
 806 }
 807 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
 808
 809 void nvm_end_io(struct nvm_rq *rqd)
 810 {
 811         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 812
 813         /* Convert address space */
 814         if (tgt_dev)
 815                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 816
 817         if (rqd->end_io)
 818                 rqd->end_io(rqd);
 819 }
 820 EXPORT_SYMBOL(nvm_end_io);
 821
 822 /*
 823  * folds a bad block list from its plane representation to its virtual
 824  * block representation. The fold is done in place and reduced size is
 825  * returned.
 826  *
 827  * If any of the planes status are bad or grown bad block, the virtual block
 828  * is marked bad. If not bad, the first plane state acts as the block state.
 829  */
 830 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 831 {
 832         struct nvm_geo *geo = &dev->geo;
 833         int blk, offset, pl, blktype;
 834
 835         if (nr_blks != geo->blks_per_lun * geo->plane_mode)
 836                 return -EINVAL;
 837
 838         for (blk = 0; blk < geo->blks_per_lun; blk++) {
 839                 offset = blk * geo->plane_mode;
 840                 blktype = blks[offset];
 841
 842                 /* Bad blocks on any planes take precedence over other types */
 843                 for (pl = 0; pl < geo->plane_mode; pl++) {
 844                         if (blks[offset + pl] &
 845                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 846                                 blktype = blks[offset + pl];
 847                                 break;
 848                         }
 849                 }
 850
 851                 blks[blk] = blktype;
 852         }
 853
 854         return geo->blks_per_lun;
 855 }
 856 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 857
 858 int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 859                        u8 *blks)
 860 {
 861         struct nvm_dev *dev = tgt_dev->parent;
 862
 863         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
 864
 865         return dev->ops->get_bb_tbl(dev, ppa, blks);
 866 }
 867 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 868
 869 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 870 {
 871         struct nvm_geo *geo = &dev->geo;
 872         int i;
 873
 874         dev->lps_per_blk = geo->pgs_per_blk;
 875         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 876         if (!dev->lptbl)
 877                 return -ENOMEM;
 878
 879         /* Just a linear array */
 880         for (i = 0; i < dev->lps_per_blk; i++)
 881                 dev->lptbl[i] = i;
 882
 883         return 0;
 884 }
 885
 886 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 887 {
 888         int i, p;
 889         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 890
 891         if (!mlc->num_pairs)
 892                 return 0;
 893
 894         dev->lps_per_blk = mlc->num_pairs;
 895         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 896         if (!dev->lptbl)
 897                 return -ENOMEM;
 898
 899         /* The lower page table encoding consists of a list of bytes, where each
 900          * has a lower and an upper half. The first half byte maintains the
 901          * increment value and every value after is an offset added to the
 902          * previous incrementation value
 903          */
 904         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 905         for (i = 1; i < dev->lps_per_blk; i++) {
 906                 p = mlc->pairs[i >> 1];
 907                 if (i & 0x1) /* upper */
 908                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 909                 else /* lower */
 910                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 911         }
 912
 913         return 0;
 914 }
 915
 916 static int nvm_core_init(struct nvm_dev *dev)
 917 {
 918         struct nvm_id *id = &dev->identity;
 919         struct nvm_id_group *grp = &id->grp;
 920         struct nvm_geo *geo = &dev->geo;
 921         int ret;
 922
 923         /* Whole device values */
 924         geo->nr_chnls = grp->num_ch;
 925         geo->luns_per_chnl = grp->num_lun;
 926
 927         /* Generic device values */
 928         geo->pgs_per_blk = grp->num_pg;
 929         geo->blks_per_lun = grp->num_blk;
 930         geo->nr_planes = grp->num_pln;
 931         geo->fpg_size = grp->fpg_sz;
 932         geo->pfpg_size = grp->fpg_sz * grp->num_pln;
 933         geo->sec_size = grp->csecs;
 934         geo->oob_size = grp->sos;
 935         geo->sec_per_pg = grp->fpg_sz / grp->csecs;
 936         geo->mccap = grp->mccap;
 937         memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 938
 939         geo->plane_mode = NVM_PLANE_SINGLE;
 940         geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
 941
 942         if (grp->mpos & 0x020202)
 943                 geo->plane_mode = NVM_PLANE_DOUBLE;
 944         if (grp->mpos & 0x040404)
 945                 geo->plane_mode = NVM_PLANE_QUAD;
 946
 947         if (grp->mtype != 0) {
 948                 pr_err("nvm: memory type not supported\n");
 949                 return -EINVAL;
 950         }
 951
 952         /* calculated values */
 953         geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
 954         geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
 955         geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
 956         geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
 957
 958         dev->total_secs = geo->nr_luns * geo->sec_per_lun;
 959         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->nr_luns),
 960                                         sizeof(unsigned long), GFP_KERNEL);
 961         if (!dev->lun_map)
 962                 return -ENOMEM;
 963
 964         switch (grp->fmtype) {
 965         case NVM_ID_FMTYPE_SLC:
 966                 if (nvm_init_slc_tbl(dev, grp)) {
 967                         ret = -ENOMEM;
 968                         goto err_fmtype;
 969                 }
 970                 break;
 971         case NVM_ID_FMTYPE_MLC:
 972                 if (nvm_init_mlc_tbl(dev, grp)) {
 973                         ret = -ENOMEM;
 974                         goto err_fmtype;
 975                 }
 976                 break;
 977         default:
 978                 pr_err("nvm: flash type not supported\n");
 979                 ret = -EINVAL;
 980                 goto err_fmtype;
 981         }
 982
 983         INIT_LIST_HEAD(&dev->area_list);
 984         INIT_LIST_HEAD(&dev->targets);
 985         mutex_init(&dev->mlock);
 986         spin_lock_init(&dev->lock);
 987
 988         ret = nvm_register_map(dev);
 989         if (ret)
 990                 goto err_fmtype;
 991
 992         blk_queue_logical_block_size(dev->q, geo->sec_size);
 993         return 0;
 994 err_fmtype:
 995         kfree(dev->lun_map);
 996         return ret;
 997 }
 998
 999 void nvm_free(struct nvm_dev *dev)
1000 {
1001         if (!dev)
1002                 return;
1003
1004         if (dev->dma_pool)
1005                 dev->ops->destroy_dma_pool(dev->dma_pool);
1006
1007         nvm_unregister_map(dev);
1008         kfree(dev->lptbl);
1009         kfree(dev->lun_map);
1010         kfree(dev);
1011 }
1012
1013 static int nvm_init(struct nvm_dev *dev)
1014 {
1015         struct nvm_geo *geo = &dev->geo;
1016         int ret = -EINVAL;
1017
1018         if (dev->ops->identity(dev, &dev->identity)) {
1019                 pr_err("nvm: device could not be identified\n");
1020                 goto err;
1021         }
1022
1023         pr_debug("nvm: ver:%x nvm_vendor:%x\n",
1024                         dev->identity.ver_id, dev->identity.vmnt);
1025
1026         if (dev->identity.ver_id != 1) {
1027                 pr_err("nvm: device not supported by kernel.");
1028                 goto err;
1029         }
1030
1031         ret = nvm_core_init(dev);
1032         if (ret) {
1033                 pr_err("nvm: could not initialize core structures.\n");
1034                 goto err;
1035         }
1036
1037         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
1038                         dev->name, geo->sec_per_pg, geo->nr_planes,
1039                         geo->pgs_per_blk, geo->blks_per_lun,
1040                         geo->nr_luns, geo->nr_chnls);
1041         return 0;
1042 err:
1043         pr_err("nvm: failed to initialize nvm\n");
1044         return ret;
1045 }
1046
1047 struct nvm_dev *nvm_alloc_dev(int node)
1048 {
1049         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1050 }
1051 EXPORT_SYMBOL(nvm_alloc_dev);
1052
1053 int nvm_register(struct nvm_dev *dev)
1054 {
1055         int ret;
1056
1057         if (!dev->q || !dev->ops)
1058                 return -EINVAL;
1059
1060         if (dev->ops->max_phys_sect > 256) {
1061                 pr_info("nvm: max sectors supported is 256.\n");
1062                 return -EINVAL;
1063         }
1064
1065         if (dev->ops->max_phys_sect > 1) {
1066                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1067                 if (!dev->dma_pool) {
1068                         pr_err("nvm: could not create dma pool\n");
1069                         return -ENOMEM;
1070                 }
1071         }
1072
1073         ret = nvm_init(dev);
1074         if (ret)
1075                 goto err_init;
1076
1077         /* register device with a supported media manager */
1078         down_write(&nvm_lock);
1079         list_add(&dev->devices, &nvm_devices);
1080         up_write(&nvm_lock);
1081
1082         return 0;
1083 err_init:
1084         dev->ops->destroy_dma_pool(dev->dma_pool);
1085         return ret;
1086 }
1087 EXPORT_SYMBOL(nvm_register);
1088
1089 void nvm_unregister(struct nvm_dev *dev)
1090 {
1091         struct nvm_target *t, *tmp;
1092
1093         mutex_lock(&dev->mlock);
1094         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1095                 if (t->dev->parent != dev)
1096                         continue;
1097                 __nvm_remove_target(t);
1098         }
1099         mutex_unlock(&dev->mlock);
1100
1101         down_write(&nvm_lock);
1102         list_del(&dev->devices);
1103         up_write(&nvm_lock);
1104
1105         nvm_free(dev);
1106 }
1107 EXPORT_SYMBOL(nvm_unregister);
1108
1109 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1110 {
1111         struct nvm_dev *dev;
1112         struct nvm_ioctl_create_simple *s;
1113
1114         down_write(&nvm_lock);
1115         dev = nvm_find_nvm_dev(create->dev);
1116         up_write(&nvm_lock);
1117
1118         if (!dev) {
1119                 pr_err("nvm: device not found\n");
1120                 return -EINVAL;
1121         }
1122
1123         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
1124                 pr_err("nvm: config type not valid\n");
1125                 return -EINVAL;
1126         }
1127         s = &create->conf.s;
1128
1129         if (s->lun_begin == -1 && s->lun_end == -1) {
1130                 s->lun_begin = 0;
1131                 s->lun_end = dev->geo.nr_luns - 1;
1132         }
1133
1134         if (s->lun_begin > s->lun_end || s->lun_end >= dev->geo.nr_luns) {
1135                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
1136                         s->lun_begin, s->lun_end, dev->geo.nr_luns - 1);
1137                 return -EINVAL;
1138         }
1139
1140         return nvm_create_tgt(dev, create);
1141 }
1142
1143 static long nvm_ioctl_info(struct file *file, void __user *arg)
1144 {
1145         struct nvm_ioctl_info *info;
1146         struct nvm_tgt_type *tt;
1147         int tgt_iter = 0;
1148
1149         if (!capable(CAP_SYS_ADMIN))
1150                 return -EPERM;
1151
1152         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1153         if (IS_ERR(info))
1154                 return -EFAULT;
1155
1156         info->version[0] = NVM_VERSION_MAJOR;
1157         info->version[1] = NVM_VERSION_MINOR;
1158         info->version[2] = NVM_VERSION_PATCH;
1159
1160         down_write(&nvm_lock);
1161         list_for_each_entry(tt, &nvm_tgt_types, list) {
1162                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1163
1164                 tgt->version[0] = tt->version[0];
1165                 tgt->version[1] = tt->version[1];
1166                 tgt->version[2] = tt->version[2];
1167                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1168
1169                 tgt_iter++;
1170         }
1171
1172         info->tgtsize = tgt_iter;
1173         up_write(&nvm_lock);
1174
1175         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1176                 kfree(info);
1177                 return -EFAULT;
1178         }
1179
1180         kfree(info);
1181         return 0;
1182 }
1183
1184 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1185 {
1186         struct nvm_ioctl_get_devices *devices;
1187         struct nvm_dev *dev;
1188         int i = 0;
1189
1190         if (!capable(CAP_SYS_ADMIN))
1191                 return -EPERM;
1192
1193         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1194         if (!devices)
1195                 return -ENOMEM;
1196
1197         down_write(&nvm_lock);
1198         list_for_each_entry(dev, &nvm_devices, devices) {
1199                 struct nvm_ioctl_device_info *info = &devices->info[i];
1200
1201                 sprintf(info->devname, "%s", dev->name);
1202
1203                 /* kept for compatibility */
1204                 info->bmversion[0] = 1;
1205                 info->bmversion[1] = 0;
1206                 info->bmversion[2] = 0;
1207                 sprintf(info->bmname, "%s", "gennvm");
1208                 i++;
1209
1210                 if (i > 31) {
1211                         pr_err("nvm: max 31 devices can be reported.\n");
1212                         break;
1213                 }
1214         }
1215         up_write(&nvm_lock);
1216
1217         devices->nr_devices = i;
1218
1219         if (copy_to_user(arg, devices,
1220                          sizeof(struct nvm_ioctl_get_devices))) {
1221                 kfree(devices);
1222                 return -EFAULT;
1223         }
1224
1225         kfree(devices);
1226         return 0;
1227 }
1228
1229 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1230 {
1231         struct nvm_ioctl_create create;
1232
1233         if (!capable(CAP_SYS_ADMIN))
1234                 return -EPERM;
1235
1236         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1237                 return -EFAULT;
1238
1239         create.dev[DISK_NAME_LEN - 1] = '\0';
1240         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1241         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1242
1243         if (create.flags != 0) {
1244                 pr_err("nvm: no flags supported\n");
1245                 return -EINVAL;
1246         }
1247
1248         return __nvm_configure_create(&create);
1249 }
1250
1251 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1252 {
1253         struct nvm_ioctl_remove remove;
1254         struct nvm_dev *dev;
1255         int ret = 0;
1256
1257         if (!capable(CAP_SYS_ADMIN))
1258                 return -EPERM;
1259
1260         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1261                 return -EFAULT;
1262
1263         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1264
1265         if (remove.flags != 0) {
1266                 pr_err("nvm: no flags supported\n");
1267                 return -EINVAL;
1268         }
1269
1270         list_for_each_entry(dev, &nvm_devices, devices) {
1271                 ret = nvm_remove_tgt(dev, &remove);
1272                 if (!ret)
1273                         break;
1274         }
1275
1276         return ret;
1277 }
1278
1279 /* kept for compatibility reasons */
1280 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1281 {
1282         struct nvm_ioctl_dev_init init;
1283
1284         if (!capable(CAP_SYS_ADMIN))
1285                 return -EPERM;
1286
1287         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1288                 return -EFAULT;
1289
1290         if (init.flags != 0) {
1291                 pr_err("nvm: no flags supported\n");
1292                 return -EINVAL;
1293         }
1294
1295         return 0;
1296 }
1297
1298 /* Kept for compatibility reasons */
1299 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1300 {
1301         struct nvm_ioctl_dev_factory fact;
1302
1303         if (!capable(CAP_SYS_ADMIN))
1304                 return -EPERM;
1305
1306         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1307                 return -EFAULT;
1308
1309         fact.dev[DISK_NAME_LEN - 1] = '\0';
1310
1311         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1312                 return -EINVAL;
1313
1314         return 0;
1315 }
1316
1317 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1318 {
1319         void __user *argp = (void __user *)arg;
1320
1321         switch (cmd) {
1322         case NVM_INFO:
1323                 return nvm_ioctl_info(file, argp);
1324         case NVM_GET_DEVICES:
1325                 return nvm_ioctl_get_devices(file, argp);
1326         case NVM_DEV_CREATE:
1327                 return nvm_ioctl_dev_create(file, argp);
1328         case NVM_DEV_REMOVE:
1329                 return nvm_ioctl_dev_remove(file, argp);
1330         case NVM_DEV_INIT:
1331                 return nvm_ioctl_dev_init(file, argp);
1332         case NVM_DEV_FACTORY:
1333                 return nvm_ioctl_dev_factory(file, argp);
1334         }
1335         return 0;
1336 }
1337
1338 static const struct file_operations _ctl_fops = {
1339         .open = nonseekable_open,
1340         .unlocked_ioctl = nvm_ctl_ioctl,
1341         .owner = THIS_MODULE,
1342         .llseek  = noop_llseek,
1343 };
1344
1345 static struct miscdevice _nvm_misc = {
1346         .minor          = MISC_DYNAMIC_MINOR,
1347         .name           = "lightnvm",
1348         .nodename       = "lightnvm/control",
1349         .fops           = &_ctl_fops,
1350 };
1351 builtin_misc_device(_nvm_misc);