drivers/lightnvm/core.c

   1 /*
   2  * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
   3  * Initial release: Matias Bjorling <[email protected]>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License version
   7  * 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; see the file COPYING.  If not, write to
  16  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
  17  * USA.
  18  *
  19  */
  20
  21 #include <linux/list.h>
  22 #include <linux/types.h>
  23 #include <linux/sem.h>
  24 #include <linux/bitmap.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/lightnvm.h>
  29 #include <linux/sched/sysctl.h>
  30
  31 static LIST_HEAD(nvm_tgt_types);
  32 static DECLARE_RWSEM(nvm_tgtt_lock);
  33 static LIST_HEAD(nvm_devices);
  34 static DECLARE_RWSEM(nvm_lock);
  35
  36 /* Map between virtual and physical channel and lun */
  37 struct nvm_ch_map {
  38         int ch_off;
  39         int nr_luns;
  40         int *lun_offs;
  41 };
  42
  43 struct nvm_dev_map {
  44         struct nvm_ch_map *chnls;
  45         int nr_chnls;
  46 };
  47
  48 struct nvm_area {
  49         struct list_head list;
  50         sector_t begin;
  51         sector_t end;   /* end is excluded */
  52 };
  53
  54 static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
  55 {
  56         struct nvm_target *tgt;
  57
  58         list_for_each_entry(tgt, &dev->targets, list)
  59                 if (!strcmp(name, tgt->disk->disk_name))
  60                         return tgt;
  61
  62         return NULL;
  63 }
  64
  65 static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
  66 {
  67         int i;
  68
  69         for (i = lun_begin; i <= lun_end; i++) {
  70                 if (test_and_set_bit(i, dev->lun_map)) {
  71                         pr_err("nvm: lun %d already allocated\n", i);
  72                         goto err;
  73                 }
  74         }
  75
  76         return 0;
  77 err:
  78         while (--i >= lun_begin)
  79                 clear_bit(i, dev->lun_map);
  80
  81         return -EBUSY;
  82 }
  83
  84 static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
  85                                  int lun_end)
  86 {
  87         int i;
  88
  89         for (i = lun_begin; i <= lun_end; i++)
  90                 WARN_ON(!test_and_clear_bit(i, dev->lun_map));
  91 }
  92
  93 static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear)
  94 {
  95         struct nvm_dev *dev = tgt_dev->parent;
  96         struct nvm_dev_map *dev_map = tgt_dev->map;
  97         int i, j;
  98
  99         for (i = 0; i < dev_map->nr_chnls; i++) {
 100                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 101                 int *lun_offs = ch_map->lun_offs;
 102                 int ch = i + ch_map->ch_off;
 103
 104                 if (clear) {
 105                         for (j = 0; j < ch_map->nr_luns; j++) {
 106                                 int lun = j + lun_offs[j];
 107                                 int lunid = (ch * dev->geo.luns_per_chnl) + lun;
 108
 109                                 WARN_ON(!test_and_clear_bit(lunid,
 110                                                         dev->lun_map));
 111                         }
 112                 }
 113
 114                 kfree(ch_map->lun_offs);
 115         }
 116
 117         kfree(dev_map->chnls);
 118         kfree(dev_map);
 119
 120         kfree(tgt_dev->luns);
 121         kfree(tgt_dev);
 122 }
 123
 124 static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
 125                                               int lun_begin, int lun_end)
 126 {
 127         struct nvm_tgt_dev *tgt_dev = NULL;
 128         struct nvm_dev_map *dev_rmap = dev->rmap;
 129         struct nvm_dev_map *dev_map;
 130         struct ppa_addr *luns;
 131         int nr_luns = lun_end - lun_begin + 1;
 132         int luns_left = nr_luns;
 133         int nr_chnls = nr_luns / dev->geo.luns_per_chnl;
 134         int nr_chnls_mod = nr_luns % dev->geo.luns_per_chnl;
 135         int bch = lun_begin / dev->geo.luns_per_chnl;
 136         int blun = lun_begin % dev->geo.luns_per_chnl;
 137         int lunid = 0;
 138         int lun_balanced = 1;
 139         int prev_nr_luns;
 140         int i, j;
 141
 142         nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1;
 143
 144         dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 145         if (!dev_map)
 146                 goto err_dev;
 147
 148         dev_map->chnls = kcalloc(nr_chnls, sizeof(struct nvm_ch_map),
 149                                                                 GFP_KERNEL);
 150         if (!dev_map->chnls)
 151                 goto err_chnls;
 152
 153         luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL);
 154         if (!luns)
 155                 goto err_luns;
 156
 157         prev_nr_luns = (luns_left > dev->geo.luns_per_chnl) ?
 158                                         dev->geo.luns_per_chnl : luns_left;
 159         for (i = 0; i < nr_chnls; i++) {
 160                 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
 161                 int *lun_roffs = ch_rmap->lun_offs;
 162                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 163                 int *lun_offs;
 164                 int luns_in_chnl = (luns_left > dev->geo.luns_per_chnl) ?
 165                                         dev->geo.luns_per_chnl : luns_left;
 166
 167                 if (lun_balanced && prev_nr_luns != luns_in_chnl)
 168                         lun_balanced = 0;
 169
 170                 ch_map->ch_off = ch_rmap->ch_off = bch;
 171                 ch_map->nr_luns = luns_in_chnl;
 172
 173                 lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 174                 if (!lun_offs)
 175                         goto err_ch;
 176
 177                 for (j = 0; j < luns_in_chnl; j++) {
 178                         luns[lunid].ppa = 0;
 179                         luns[lunid].g.ch = i;
 180                         luns[lunid++].g.lun = j;
 181
 182                         lun_offs[j] = blun;
 183                         lun_roffs[j + blun] = blun;
 184                 }
 185
 186                 ch_map->lun_offs = lun_offs;
 187
 188                 /* when starting a new channel, lun offset is reset */
 189                 blun = 0;
 190                 luns_left -= luns_in_chnl;
 191         }
 192
 193         dev_map->nr_chnls = nr_chnls;
 194
 195         tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
 196         if (!tgt_dev)
 197                 goto err_ch;
 198
 199         memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
 200         /* Target device only owns a portion of the physical device */
 201         tgt_dev->geo.nr_chnls = nr_chnls;
 202         tgt_dev->geo.nr_luns = nr_luns;
 203         tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1;
 204         tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun;
 205         tgt_dev->q = dev->q;
 206         tgt_dev->map = dev_map;
 207         tgt_dev->luns = luns;
 208         memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id));
 209
 210         tgt_dev->parent = dev;
 211
 212         return tgt_dev;
 213 err_ch:
 214         while (--i >= 0)
 215                 kfree(dev_map->chnls[i].lun_offs);
 216         kfree(luns);
 217 err_luns:
 218         kfree(dev_map->chnls);
 219 err_chnls:
 220         kfree(dev_map);
 221 err_dev:
 222         return tgt_dev;
 223 }
 224
 225 static const struct block_device_operations nvm_fops = {
 226         .owner          = THIS_MODULE,
 227 };
 228
 229 static struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
 230 {
 231         struct nvm_tgt_type *tmp, *tt = NULL;
 232
 233         if (lock)
 234                 down_write(&nvm_tgtt_lock);
 235
 236         list_for_each_entry(tmp, &nvm_tgt_types, list)
 237                 if (!strcmp(name, tmp->name)) {
 238                         tt = tmp;
 239                         break;
 240                 }
 241
 242         if (lock)
 243                 up_write(&nvm_tgtt_lock);
 244         return tt;
 245 }
 246
 247 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 248 {
 249         struct nvm_ioctl_create_simple *s = &create->conf.s;
 250         struct request_queue *tqueue;
 251         struct gendisk *tdisk;
 252         struct nvm_tgt_type *tt;
 253         struct nvm_target *t;
 254         struct nvm_tgt_dev *tgt_dev;
 255         void *targetdata;
 256         int ret;
 257
 258         tt = nvm_find_target_type(create->tgttype, 1);
 259         if (!tt) {
 260                 pr_err("nvm: target type %s not found\n", create->tgttype);
 261                 return -EINVAL;
 262         }
 263
 264         mutex_lock(&dev->mlock);
 265         t = nvm_find_target(dev, create->tgtname);
 266         if (t) {
 267                 pr_err("nvm: target name already exists.\n");
 268                 mutex_unlock(&dev->mlock);
 269                 return -EINVAL;
 270         }
 271         mutex_unlock(&dev->mlock);
 272
 273         ret = nvm_reserve_luns(dev, s->lun_begin, s->lun_end);
 274         if (ret)
 275                 return ret;
 276
 277         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 278         if (!t) {
 279                 ret = -ENOMEM;
 280                 goto err_reserve;
 281         }
 282
 283         tgt_dev = nvm_create_tgt_dev(dev, s->lun_begin, s->lun_end);
 284         if (!tgt_dev) {
 285                 pr_err("nvm: could not create target device\n");
 286                 ret = -ENOMEM;
 287                 goto err_t;
 288         }
 289
 290         tdisk = alloc_disk(0);
 291         if (!tdisk) {
 292                 ret = -ENOMEM;
 293                 goto err_dev;
 294         }
 295
 296         tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
 297         if (!tqueue) {
 298                 ret = -ENOMEM;
 299                 goto err_disk;
 300         }
 301         blk_queue_make_request(tqueue, tt->make_rq);
 302
 303         strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 304         tdisk->flags = GENHD_FL_EXT_DEVT;
 305         tdisk->major = 0;
 306         tdisk->first_minor = 0;
 307         tdisk->fops = &nvm_fops;
 308         tdisk->queue = tqueue;
 309
 310         targetdata = tt->init(tgt_dev, tdisk, create->flags);
 311         if (IS_ERR(targetdata)) {
 312                 ret = PTR_ERR(targetdata);
 313                 goto err_init;
 314         }
 315
 316         tdisk->private_data = targetdata;
 317         tqueue->queuedata = targetdata;
 318
 319         blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
 320
 321         set_capacity(tdisk, tt->capacity(targetdata));
 322         add_disk(tdisk);
 323
 324         if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
 325                 ret = -ENOMEM;
 326                 goto err_sysfs;
 327         }
 328
 329         t->type = tt;
 330         t->disk = tdisk;
 331         t->dev = tgt_dev;
 332
 333         mutex_lock(&dev->mlock);
 334         list_add_tail(&t->list, &dev->targets);
 335         mutex_unlock(&dev->mlock);
 336
 337         __module_get(tt->owner);
 338
 339         return 0;
 340 err_sysfs:
 341         if (tt->exit)
 342                 tt->exit(targetdata);
 343 err_init:
 344         blk_cleanup_queue(tqueue);
 345         tdisk->queue = NULL;
 346 err_disk:
 347         put_disk(tdisk);
 348 err_dev:
 349         nvm_remove_tgt_dev(tgt_dev, 0);
 350 err_t:
 351         kfree(t);
 352 err_reserve:
 353         nvm_release_luns_err(dev, s->lun_begin, s->lun_end);
 354         return ret;
 355 }
 356
 357 static void __nvm_remove_target(struct nvm_target *t)
 358 {
 359         struct nvm_tgt_type *tt = t->type;
 360         struct gendisk *tdisk = t->disk;
 361         struct request_queue *q = tdisk->queue;
 362
 363         del_gendisk(tdisk);
 364         blk_cleanup_queue(q);
 365
 366         if (tt->sysfs_exit)
 367                 tt->sysfs_exit(tdisk);
 368
 369         if (tt->exit)
 370                 tt->exit(tdisk->private_data);
 371
 372         nvm_remove_tgt_dev(t->dev, 1);
 373         put_disk(tdisk);
 374         module_put(t->type->owner);
 375
 376         list_del(&t->list);
 377         kfree(t);
 378 }
 379
 380 /**
 381  * nvm_remove_tgt - Removes a target from the media manager
 382  * @dev:        device
 383  * @remove:     ioctl structure with target name to remove.
 384  *
 385  * Returns:
 386  * 0: on success
 387  * 1: on not found
 388  * <0: on error
 389  */
 390 static int nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
 391 {
 392         struct nvm_target *t;
 393
 394         mutex_lock(&dev->mlock);
 395         t = nvm_find_target(dev, remove->tgtname);
 396         if (!t) {
 397                 mutex_unlock(&dev->mlock);
 398                 return 1;
 399         }
 400         __nvm_remove_target(t);
 401         mutex_unlock(&dev->mlock);
 402
 403         return 0;
 404 }
 405
 406 static int nvm_register_map(struct nvm_dev *dev)
 407 {
 408         struct nvm_dev_map *rmap;
 409         int i, j;
 410
 411         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 412         if (!rmap)
 413                 goto err_rmap;
 414
 415         rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct nvm_ch_map),
 416                                                                 GFP_KERNEL);
 417         if (!rmap->chnls)
 418                 goto err_chnls;
 419
 420         for (i = 0; i < dev->geo.nr_chnls; i++) {
 421                 struct nvm_ch_map *ch_rmap;
 422                 int *lun_roffs;
 423                 int luns_in_chnl = dev->geo.luns_per_chnl;
 424
 425                 ch_rmap = &rmap->chnls[i];
 426
 427                 ch_rmap->ch_off = -1;
 428                 ch_rmap->nr_luns = luns_in_chnl;
 429
 430                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 431                 if (!lun_roffs)
 432                         goto err_ch;
 433
 434                 for (j = 0; j < luns_in_chnl; j++)
 435                         lun_roffs[j] = -1;
 436
 437                 ch_rmap->lun_offs = lun_roffs;
 438         }
 439
 440         dev->rmap = rmap;
 441
 442         return 0;
 443 err_ch:
 444         while (--i >= 0)
 445                 kfree(rmap->chnls[i].lun_offs);
 446 err_chnls:
 447         kfree(rmap);
 448 err_rmap:
 449         return -ENOMEM;
 450 }
 451
 452 static void nvm_unregister_map(struct nvm_dev *dev)
 453 {
 454         struct nvm_dev_map *rmap = dev->rmap;
 455         int i;
 456
 457         for (i = 0; i < dev->geo.nr_chnls; i++)
 458                 kfree(rmap->chnls[i].lun_offs);
 459
 460         kfree(rmap->chnls);
 461         kfree(rmap);
 462 }
 463
 464 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 465 {
 466         struct nvm_dev_map *dev_map = tgt_dev->map;
 467         struct nvm_ch_map *ch_map = &dev_map->chnls[p->g.ch];
 468         int lun_off = ch_map->lun_offs[p->g.lun];
 469
 470         p->g.ch += ch_map->ch_off;
 471         p->g.lun += lun_off;
 472 }
 473
 474 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 475 {
 476         struct nvm_dev *dev = tgt_dev->parent;
 477         struct nvm_dev_map *dev_rmap = dev->rmap;
 478         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
 479         int lun_roff = ch_rmap->lun_offs[p->g.lun];
 480
 481         p->g.ch -= ch_rmap->ch_off;
 482         p->g.lun -= lun_roff;
 483 }
 484
 485 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 486                                 struct ppa_addr *ppa_list, int nr_ppas)
 487 {
 488         int i;
 489
 490         for (i = 0; i < nr_ppas; i++) {
 491                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 492                 ppa_list[i] = generic_to_dev_addr(tgt_dev, ppa_list[i]);
 493         }
 494 }
 495
 496 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 497                                 struct ppa_addr *ppa_list, int nr_ppas)
 498 {
 499         int i;
 500
 501         for (i = 0; i < nr_ppas; i++) {
 502                 ppa_list[i] = dev_to_generic_addr(tgt_dev, ppa_list[i]);
 503                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 504         }
 505 }
 506
 507 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 508 {
 509         if (rqd->nr_ppas == 1) {
 510                 nvm_ppa_tgt_to_dev(tgt_dev, &rqd->ppa_addr, 1);
 511                 return;
 512         }
 513
 514         nvm_ppa_tgt_to_dev(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 515 }
 516
 517 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 518 {
 519         if (rqd->nr_ppas == 1) {
 520                 nvm_ppa_dev_to_tgt(tgt_dev, &rqd->ppa_addr, 1);
 521                 return;
 522         }
 523
 524         nvm_ppa_dev_to_tgt(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 525 }
 526
 527 void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
 528                      int len)
 529 {
 530         struct nvm_geo *geo = &dev->geo;
 531         struct nvm_dev_map *dev_rmap = dev->rmap;
 532         u64 i;
 533
 534         for (i = 0; i < len; i++) {
 535                 struct nvm_ch_map *ch_rmap;
 536                 int *lun_roffs;
 537                 struct ppa_addr gaddr;
 538                 u64 pba = le64_to_cpu(entries[i]);
 539                 u64 diff;
 540
 541                 if (!pba)
 542                         continue;
 543
 544                 gaddr = linear_to_generic_addr(geo, pba);
 545                 ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
 546                 lun_roffs = ch_rmap->lun_offs;
 547
 548                 diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
 549                                 (lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
 550
 551                 entries[i] -= cpu_to_le64(diff);
 552         }
 553 }
 554 EXPORT_SYMBOL(nvm_part_to_tgt);
 555
 556 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 557 {
 558         int ret = 0;
 559
 560         down_write(&nvm_tgtt_lock);
 561         if (nvm_find_target_type(tt->name, 0))
 562                 ret = -EEXIST;
 563         else
 564                 list_add(&tt->list, &nvm_tgt_types);
 565         up_write(&nvm_tgtt_lock);
 566
 567         return ret;
 568 }
 569 EXPORT_SYMBOL(nvm_register_tgt_type);
 570
 571 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 572 {
 573         if (!tt)
 574                 return;
 575
 576         down_write(&nvm_tgtt_lock);
 577         list_del(&tt->list);
 578         up_write(&nvm_tgtt_lock);
 579 }
 580 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 581
 582 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 583                                                         dma_addr_t *dma_handler)
 584 {
 585         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 586                                                                 dma_handler);
 587 }
 588 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 589
 590 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 591 {
 592         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 593 }
 594 EXPORT_SYMBOL(nvm_dev_dma_free);
 595
 596 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 597 {
 598         struct nvm_dev *dev;
 599
 600         list_for_each_entry(dev, &nvm_devices, devices)
 601                 if (!strcmp(name, dev->name))
 602                         return dev;
 603
 604         return NULL;
 605 }
 606
 607 static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 608                         const struct ppa_addr *ppas, int nr_ppas)
 609 {
 610         struct nvm_dev *dev = tgt_dev->parent;
 611         struct nvm_geo *geo = &tgt_dev->geo;
 612         int i, plane_cnt, pl_idx;
 613         struct ppa_addr ppa;
 614
 615         if (geo->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
 616                 rqd->nr_ppas = nr_ppas;
 617                 rqd->ppa_addr = ppas[0];
 618
 619                 return 0;
 620         }
 621
 622         rqd->nr_ppas = nr_ppas;
 623         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 624         if (!rqd->ppa_list) {
 625                 pr_err("nvm: failed to allocate dma memory\n");
 626                 return -ENOMEM;
 627         }
 628
 629         plane_cnt = geo->plane_mode;
 630         rqd->nr_ppas *= plane_cnt;
 631
 632         for (i = 0; i < nr_ppas; i++) {
 633                 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 634                         ppa = ppas[i];
 635                         ppa.g.pl = pl_idx;
 636                         rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 637                 }
 638         }
 639
 640         return 0;
 641 }
 642
 643 static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
 644                         struct nvm_rq *rqd)
 645 {
 646         if (!rqd->ppa_list)
 647                 return;
 648
 649         nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
 650 }
 651
 652
 653 int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 654                        int nr_ppas, int type)
 655 {
 656         struct nvm_dev *dev = tgt_dev->parent;
 657         struct nvm_rq rqd;
 658         int ret;
 659
 660         if (nr_ppas > dev->ops->max_phys_sect) {
 661                 pr_err("nvm: unable to update all blocks atomically\n");
 662                 return -EINVAL;
 663         }
 664
 665         memset(&rqd, 0, sizeof(struct nvm_rq));
 666
 667         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
 668         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
 669
 670         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
 671         nvm_free_rqd_ppalist(tgt_dev, &rqd);
 672         if (ret) {
 673                 pr_err("nvm: failed bb mark\n");
 674                 return -EINVAL;
 675         }
 676
 677         return 0;
 678 }
 679 EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
 680
 681 int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
 682 {
 683         struct nvm_dev *dev = tgt_dev->parent;
 684
 685         return dev->ops->max_phys_sect;
 686 }
 687 EXPORT_SYMBOL(nvm_max_phys_sects);
 688
 689 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 690 {
 691         struct nvm_dev *dev = tgt_dev->parent;
 692         int ret;
 693
 694         if (!dev->ops->submit_io)
 695                 return -ENODEV;
 696
 697         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 698
 699         rqd->dev = tgt_dev;
 700
 701         /* In case of error, fail with right address format */
 702         ret = dev->ops->submit_io(dev, rqd);
 703         if (ret)
 704                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 705         return ret;
 706 }
 707 EXPORT_SYMBOL(nvm_submit_io);
 708
 709 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 710 {
 711         struct nvm_dev *dev = tgt_dev->parent;
 712         int ret;
 713
 714         if (!dev->ops->submit_io_sync)
 715                 return -ENODEV;
 716
 717         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 718
 719         rqd->dev = tgt_dev;
 720
 721         /* In case of error, fail with right address format */
 722         ret = dev->ops->submit_io_sync(dev, rqd);
 723         nvm_rq_dev_to_tgt(tgt_dev, rqd);
 724
 725         return ret;
 726 }
 727 EXPORT_SYMBOL(nvm_submit_io_sync);
 728
 729 int nvm_erase_sync(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 730                                                                 int nr_ppas)
 731 {
 732         struct nvm_geo *geo = &tgt_dev->geo;
 733         struct nvm_rq rqd;
 734         int ret;
 735
 736         memset(&rqd, 0, sizeof(struct nvm_rq));
 737
 738         rqd.opcode = NVM_OP_ERASE;
 739         rqd.flags = geo->plane_mode >> 1;
 740
 741         ret = nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
 742         if (ret)
 743                 return ret;
 744
 745         ret = nvm_submit_io_sync(tgt_dev, &rqd);
 746         if (ret) {
 747                 pr_err("rrpr: erase I/O submission failed: %d\n", ret);
 748                 goto free_ppa_list;
 749         }
 750
 751 free_ppa_list:
 752         nvm_free_rqd_ppalist(tgt_dev, &rqd);
 753
 754         return ret;
 755 }
 756 EXPORT_SYMBOL(nvm_erase_sync);
 757
 758 int nvm_get_l2p_tbl(struct nvm_tgt_dev *tgt_dev, u64 slba, u32 nlb,
 759                     nvm_l2p_update_fn *update_l2p, void *priv)
 760 {
 761         struct nvm_dev *dev = tgt_dev->parent;
 762
 763         if (!dev->ops->get_l2p_tbl)
 764                 return 0;
 765
 766         return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
 767 }
 768 EXPORT_SYMBOL(nvm_get_l2p_tbl);
 769
 770 int nvm_get_area(struct nvm_tgt_dev *tgt_dev, sector_t *lba, sector_t len)
 771 {
 772         struct nvm_dev *dev = tgt_dev->parent;
 773         struct nvm_geo *geo = &dev->geo;
 774         struct nvm_area *area, *prev, *next;
 775         sector_t begin = 0;
 776         sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9;
 777
 778         if (len > max_sectors)
 779                 return -EINVAL;
 780
 781         area = kmalloc(sizeof(struct nvm_area), GFP_KERNEL);
 782         if (!area)
 783                 return -ENOMEM;
 784
 785         prev = NULL;
 786
 787         spin_lock(&dev->lock);
 788         list_for_each_entry(next, &dev->area_list, list) {
 789                 if (begin + len > next->begin) {
 790                         begin = next->end;
 791                         prev = next;
 792                         continue;
 793                 }
 794                 break;
 795         }
 796
 797         if ((begin + len) > max_sectors) {
 798                 spin_unlock(&dev->lock);
 799                 kfree(area);
 800                 return -EINVAL;
 801         }
 802
 803         area->begin = *lba = begin;
 804         area->end = begin + len;
 805
 806         if (prev) /* insert into sorted order */
 807                 list_add(&area->list, &prev->list);
 808         else
 809                 list_add(&area->list, &dev->area_list);
 810         spin_unlock(&dev->lock);
 811
 812         return 0;
 813 }
 814 EXPORT_SYMBOL(nvm_get_area);
 815
 816 void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin)
 817 {
 818         struct nvm_dev *dev = tgt_dev->parent;
 819         struct nvm_area *area;
 820
 821         spin_lock(&dev->lock);
 822         list_for_each_entry(area, &dev->area_list, list) {
 823                 if (area->begin != begin)
 824                         continue;
 825
 826                 list_del(&area->list);
 827                 spin_unlock(&dev->lock);
 828                 kfree(area);
 829                 return;
 830         }
 831         spin_unlock(&dev->lock);
 832 }
 833 EXPORT_SYMBOL(nvm_put_area);
 834
 835 void nvm_end_io(struct nvm_rq *rqd)
 836 {
 837         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 838
 839         /* Convert address space */
 840         if (tgt_dev)
 841                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 842
 843         if (rqd->end_io)
 844                 rqd->end_io(rqd);
 845 }
 846 EXPORT_SYMBOL(nvm_end_io);
 847
 848 /*
 849  * folds a bad block list from its plane representation to its virtual
 850  * block representation. The fold is done in place and reduced size is
 851  * returned.
 852  *
 853  * If any of the planes status are bad or grown bad block, the virtual block
 854  * is marked bad. If not bad, the first plane state acts as the block state.
 855  */
 856 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 857 {
 858         struct nvm_geo *geo = &dev->geo;
 859         int blk, offset, pl, blktype;
 860
 861         if (nr_blks != geo->blks_per_lun * geo->plane_mode)
 862                 return -EINVAL;
 863
 864         for (blk = 0; blk < geo->blks_per_lun; blk++) {
 865                 offset = blk * geo->plane_mode;
 866                 blktype = blks[offset];
 867
 868                 /* Bad blocks on any planes take precedence over other types */
 869                 for (pl = 0; pl < geo->plane_mode; pl++) {
 870                         if (blks[offset + pl] &
 871                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 872                                 blktype = blks[offset + pl];
 873                                 break;
 874                         }
 875                 }
 876
 877                 blks[blk] = blktype;
 878         }
 879
 880         return geo->blks_per_lun;
 881 }
 882 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 883
 884 int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 885                        u8 *blks)
 886 {
 887         struct nvm_dev *dev = tgt_dev->parent;
 888
 889         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
 890
 891         return dev->ops->get_bb_tbl(dev, ppa, blks);
 892 }
 893 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 894
 895 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 896 {
 897         struct nvm_geo *geo = &dev->geo;
 898         int i;
 899
 900         dev->lps_per_blk = geo->pgs_per_blk;
 901         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 902         if (!dev->lptbl)
 903                 return -ENOMEM;
 904
 905         /* Just a linear array */
 906         for (i = 0; i < dev->lps_per_blk; i++)
 907                 dev->lptbl[i] = i;
 908
 909         return 0;
 910 }
 911
 912 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 913 {
 914         int i, p;
 915         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 916
 917         if (!mlc->num_pairs)
 918                 return 0;
 919
 920         dev->lps_per_blk = mlc->num_pairs;
 921         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 922         if (!dev->lptbl)
 923                 return -ENOMEM;
 924
 925         /* The lower page table encoding consists of a list of bytes, where each
 926          * has a lower and an upper half. The first half byte maintains the
 927          * increment value and every value after is an offset added to the
 928          * previous incrementation value
 929          */
 930         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 931         for (i = 1; i < dev->lps_per_blk; i++) {
 932                 p = mlc->pairs[i >> 1];
 933                 if (i & 0x1) /* upper */
 934                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 935                 else /* lower */
 936                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int nvm_core_init(struct nvm_dev *dev)
 943 {
 944         struct nvm_id *id = &dev->identity;
 945         struct nvm_id_group *grp = &id->grp;
 946         struct nvm_geo *geo = &dev->geo;
 947         int ret;
 948
 949         /* Whole device values */
 950         geo->nr_chnls = grp->num_ch;
 951         geo->luns_per_chnl = grp->num_lun;
 952
 953         /* Generic device values */
 954         geo->pgs_per_blk = grp->num_pg;
 955         geo->blks_per_lun = grp->num_blk;
 956         geo->nr_planes = grp->num_pln;
 957         geo->fpg_size = grp->fpg_sz;
 958         geo->pfpg_size = grp->fpg_sz * grp->num_pln;
 959         geo->sec_size = grp->csecs;
 960         geo->oob_size = grp->sos;
 961         geo->sec_per_pg = grp->fpg_sz / grp->csecs;
 962         geo->mccap = grp->mccap;
 963         memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 964
 965         geo->plane_mode = NVM_PLANE_SINGLE;
 966         geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
 967
 968         if (grp->mpos & 0x020202)
 969                 geo->plane_mode = NVM_PLANE_DOUBLE;
 970         if (grp->mpos & 0x040404)
 971                 geo->plane_mode = NVM_PLANE_QUAD;
 972
 973         if (grp->mtype != 0) {
 974                 pr_err("nvm: memory type not supported\n");
 975                 return -EINVAL;
 976         }
 977
 978         /* calculated values */
 979         geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
 980         geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
 981         geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
 982         geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
 983
 984         dev->total_secs = geo->nr_luns * geo->sec_per_lun;
 985         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->nr_luns),
 986                                         sizeof(unsigned long), GFP_KERNEL);
 987         if (!dev->lun_map)
 988                 return -ENOMEM;
 989
 990         switch (grp->fmtype) {
 991         case NVM_ID_FMTYPE_SLC:
 992                 if (nvm_init_slc_tbl(dev, grp)) {
 993                         ret = -ENOMEM;
 994                         goto err_fmtype;
 995                 }
 996                 break;
 997         case NVM_ID_FMTYPE_MLC:
 998                 if (nvm_init_mlc_tbl(dev, grp)) {
 999                         ret = -ENOMEM;
1000                         goto err_fmtype;
1001                 }
1002                 break;
1003         default:
1004                 pr_err("nvm: flash type not supported\n");
1005                 ret = -EINVAL;
1006                 goto err_fmtype;
1007         }
1008
1009         INIT_LIST_HEAD(&dev->area_list);
1010         INIT_LIST_HEAD(&dev->targets);
1011         mutex_init(&dev->mlock);
1012         spin_lock_init(&dev->lock);
1013
1014         ret = nvm_register_map(dev);
1015         if (ret)
1016                 goto err_fmtype;
1017
1018         blk_queue_logical_block_size(dev->q, geo->sec_size);
1019         return 0;
1020 err_fmtype:
1021         kfree(dev->lun_map);
1022         return ret;
1023 }
1024
1025 static void nvm_free(struct nvm_dev *dev)
1026 {
1027         if (!dev)
1028                 return;
1029
1030         if (dev->dma_pool)
1031                 dev->ops->destroy_dma_pool(dev->dma_pool);
1032
1033         nvm_unregister_map(dev);
1034         kfree(dev->lptbl);
1035         kfree(dev->lun_map);
1036         kfree(dev);
1037 }
1038
1039 static int nvm_init(struct nvm_dev *dev)
1040 {
1041         struct nvm_geo *geo = &dev->geo;
1042         int ret = -EINVAL;
1043
1044         if (dev->ops->identity(dev, &dev->identity)) {
1045                 pr_err("nvm: device could not be identified\n");
1046                 goto err;
1047         }
1048
1049         pr_debug("nvm: ver:%x nvm_vendor:%x\n",
1050                         dev->identity.ver_id, dev->identity.vmnt);
1051
1052         if (dev->identity.ver_id != 1) {
1053                 pr_err("nvm: device not supported by kernel.");
1054                 goto err;
1055         }
1056
1057         ret = nvm_core_init(dev);
1058         if (ret) {
1059                 pr_err("nvm: could not initialize core structures.\n");
1060                 goto err;
1061         }
1062
1063         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
1064                         dev->name, geo->sec_per_pg, geo->nr_planes,
1065                         geo->pgs_per_blk, geo->blks_per_lun,
1066                         geo->nr_luns, geo->nr_chnls);
1067         return 0;
1068 err:
1069         pr_err("nvm: failed to initialize nvm\n");
1070         return ret;
1071 }
1072
1073 struct nvm_dev *nvm_alloc_dev(int node)
1074 {
1075         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1076 }
1077 EXPORT_SYMBOL(nvm_alloc_dev);
1078
1079 int nvm_register(struct nvm_dev *dev)
1080 {
1081         int ret;
1082
1083         if (!dev->q || !dev->ops)
1084                 return -EINVAL;
1085
1086         if (dev->ops->max_phys_sect > 256) {
1087                 pr_info("nvm: max sectors supported is 256.\n");
1088                 return -EINVAL;
1089         }
1090
1091         if (dev->ops->max_phys_sect > 1) {
1092                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1093                 if (!dev->dma_pool) {
1094                         pr_err("nvm: could not create dma pool\n");
1095                         return -ENOMEM;
1096                 }
1097         }
1098
1099         ret = nvm_init(dev);
1100         if (ret)
1101                 goto err_init;
1102
1103         /* register device with a supported media manager */
1104         down_write(&nvm_lock);
1105         list_add(&dev->devices, &nvm_devices);
1106         up_write(&nvm_lock);
1107
1108         return 0;
1109 err_init:
1110         dev->ops->destroy_dma_pool(dev->dma_pool);
1111         return ret;
1112 }
1113 EXPORT_SYMBOL(nvm_register);
1114
1115 void nvm_unregister(struct nvm_dev *dev)
1116 {
1117         struct nvm_target *t, *tmp;
1118
1119         mutex_lock(&dev->mlock);
1120         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1121                 if (t->dev->parent != dev)
1122                         continue;
1123                 __nvm_remove_target(t);
1124         }
1125         mutex_unlock(&dev->mlock);
1126
1127         down_write(&nvm_lock);
1128         list_del(&dev->devices);
1129         up_write(&nvm_lock);
1130
1131         nvm_free(dev);
1132 }
1133 EXPORT_SYMBOL(nvm_unregister);
1134
1135 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1136 {
1137         struct nvm_dev *dev;
1138         struct nvm_ioctl_create_simple *s;
1139
1140         down_write(&nvm_lock);
1141         dev = nvm_find_nvm_dev(create->dev);
1142         up_write(&nvm_lock);
1143
1144         if (!dev) {
1145                 pr_err("nvm: device not found\n");
1146                 return -EINVAL;
1147         }
1148
1149         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
1150                 pr_err("nvm: config type not valid\n");
1151                 return -EINVAL;
1152         }
1153         s = &create->conf.s;
1154
1155         if (s->lun_begin == -1 && s->lun_end == -1) {
1156                 s->lun_begin = 0;
1157                 s->lun_end = dev->geo.nr_luns - 1;
1158         }
1159
1160         if (s->lun_begin > s->lun_end || s->lun_end >= dev->geo.nr_luns) {
1161                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
1162                         s->lun_begin, s->lun_end, dev->geo.nr_luns - 1);
1163                 return -EINVAL;
1164         }
1165
1166         return nvm_create_tgt(dev, create);
1167 }
1168
1169 static long nvm_ioctl_info(struct file *file, void __user *arg)
1170 {
1171         struct nvm_ioctl_info *info;
1172         struct nvm_tgt_type *tt;
1173         int tgt_iter = 0;
1174
1175         if (!capable(CAP_SYS_ADMIN))
1176                 return -EPERM;
1177
1178         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1179         if (IS_ERR(info))
1180                 return -EFAULT;
1181
1182         info->version[0] = NVM_VERSION_MAJOR;
1183         info->version[1] = NVM_VERSION_MINOR;
1184         info->version[2] = NVM_VERSION_PATCH;
1185
1186         down_write(&nvm_tgtt_lock);
1187         list_for_each_entry(tt, &nvm_tgt_types, list) {
1188                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1189
1190                 tgt->version[0] = tt->version[0];
1191                 tgt->version[1] = tt->version[1];
1192                 tgt->version[2] = tt->version[2];
1193                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1194
1195                 tgt_iter++;
1196         }
1197
1198         info->tgtsize = tgt_iter;
1199         up_write(&nvm_tgtt_lock);
1200
1201         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1202                 kfree(info);
1203                 return -EFAULT;
1204         }
1205
1206         kfree(info);
1207         return 0;
1208 }
1209
1210 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1211 {
1212         struct nvm_ioctl_get_devices *devices;
1213         struct nvm_dev *dev;
1214         int i = 0;
1215
1216         if (!capable(CAP_SYS_ADMIN))
1217                 return -EPERM;
1218
1219         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1220         if (!devices)
1221                 return -ENOMEM;
1222
1223         down_write(&nvm_lock);
1224         list_for_each_entry(dev, &nvm_devices, devices) {
1225                 struct nvm_ioctl_device_info *info = &devices->info[i];
1226
1227                 strlcpy(info->devname, dev->name, sizeof(info->devname));
1228
1229                 /* kept for compatibility */
1230                 info->bmversion[0] = 1;
1231                 info->bmversion[1] = 0;
1232                 info->bmversion[2] = 0;
1233                 strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
1234                 i++;
1235
1236                 if (i > 31) {
1237                         pr_err("nvm: max 31 devices can be reported.\n");
1238                         break;
1239                 }
1240         }
1241         up_write(&nvm_lock);
1242
1243         devices->nr_devices = i;
1244
1245         if (copy_to_user(arg, devices,
1246                          sizeof(struct nvm_ioctl_get_devices))) {
1247                 kfree(devices);
1248                 return -EFAULT;
1249         }
1250
1251         kfree(devices);
1252         return 0;
1253 }
1254
1255 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1256 {
1257         struct nvm_ioctl_create create;
1258
1259         if (!capable(CAP_SYS_ADMIN))
1260                 return -EPERM;
1261
1262         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1263                 return -EFAULT;
1264
1265         create.dev[DISK_NAME_LEN - 1] = '\0';
1266         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1267         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1268
1269         if (create.flags != 0) {
1270                 __u32 flags = create.flags;
1271
1272                 /* Check for valid flags */
1273                 if (flags & NVM_TARGET_FACTORY)
1274                         flags &= ~NVM_TARGET_FACTORY;
1275
1276                 if (flags) {
1277                         pr_err("nvm: flag not supported\n");
1278                         return -EINVAL;
1279                 }
1280         }
1281
1282         return __nvm_configure_create(&create);
1283 }
1284
1285 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1286 {
1287         struct nvm_ioctl_remove remove;
1288         struct nvm_dev *dev;
1289         int ret = 0;
1290
1291         if (!capable(CAP_SYS_ADMIN))
1292                 return -EPERM;
1293
1294         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1295                 return -EFAULT;
1296
1297         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1298
1299         if (remove.flags != 0) {
1300                 pr_err("nvm: no flags supported\n");
1301                 return -EINVAL;
1302         }
1303
1304         list_for_each_entry(dev, &nvm_devices, devices) {
1305                 ret = nvm_remove_tgt(dev, &remove);
1306                 if (!ret)
1307                         break;
1308         }
1309
1310         return ret;
1311 }
1312
1313 /* kept for compatibility reasons */
1314 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1315 {
1316         struct nvm_ioctl_dev_init init;
1317
1318         if (!capable(CAP_SYS_ADMIN))
1319                 return -EPERM;
1320
1321         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1322                 return -EFAULT;
1323
1324         if (init.flags != 0) {
1325                 pr_err("nvm: no flags supported\n");
1326                 return -EINVAL;
1327         }
1328
1329         return 0;
1330 }
1331
1332 /* Kept for compatibility reasons */
1333 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1334 {
1335         struct nvm_ioctl_dev_factory fact;
1336
1337         if (!capable(CAP_SYS_ADMIN))
1338                 return -EPERM;
1339
1340         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1341                 return -EFAULT;
1342
1343         fact.dev[DISK_NAME_LEN - 1] = '\0';
1344
1345         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1346                 return -EINVAL;
1347
1348         return 0;
1349 }
1350
1351 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1352 {
1353         void __user *argp = (void __user *)arg;
1354
1355         switch (cmd) {
1356         case NVM_INFO:
1357                 return nvm_ioctl_info(file, argp);
1358         case NVM_GET_DEVICES:
1359                 return nvm_ioctl_get_devices(file, argp);
1360         case NVM_DEV_CREATE:
1361                 return nvm_ioctl_dev_create(file, argp);
1362         case NVM_DEV_REMOVE:
1363                 return nvm_ioctl_dev_remove(file, argp);
1364         case NVM_DEV_INIT:
1365                 return nvm_ioctl_dev_init(file, argp);
1366         case NVM_DEV_FACTORY:
1367                 return nvm_ioctl_dev_factory(file, argp);
1368         }
1369         return 0;
1370 }
1371
1372 static const struct file_operations _ctl_fops = {
1373         .open = nonseekable_open,
1374         .unlocked_ioctl = nvm_ctl_ioctl,
1375         .owner = THIS_MODULE,
1376         .llseek  = noop_llseek,
1377 };
1378
1379 static struct miscdevice _nvm_misc = {
1380         .minor          = MISC_DYNAMIC_MINOR,
1381         .name           = "lightnvm",
1382         .nodename       = "lightnvm/control",
1383         .fops           = &_ctl_fops,
1384 };
1385 builtin_misc_device(_nvm_misc);