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 enum {
  54         TRANS_TGT_TO_DEV =      0x0,
  55         TRANS_DEV_TO_TGT =      0x1,
  56 };
  57
  58 static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
  59 {
  60         struct nvm_target *tgt;
  61
  62         list_for_each_entry(tgt, &dev->targets, list)
  63                 if (!strcmp(name, tgt->disk->disk_name))
  64                         return tgt;
  65
  66         return NULL;
  67 }
  68
  69 static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
  70 {
  71         int i;
  72
  73         for (i = lun_begin; i <= lun_end; i++) {
  74                 if (test_and_set_bit(i, dev->lun_map)) {
  75                         pr_err("nvm: lun %d already allocated\n", i);
  76                         goto err;
  77                 }
  78         }
  79
  80         return 0;
  81 err:
  82         while (--i > lun_begin)
  83                 clear_bit(i, dev->lun_map);
  84
  85         return -EBUSY;
  86 }
  87
  88 static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
  89                                  int lun_end)
  90 {
  91         int i;
  92
  93         for (i = lun_begin; i <= lun_end; i++)
  94                 WARN_ON(!test_and_clear_bit(i, dev->lun_map));
  95 }
  96
  97 static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev)
  98 {
  99         struct nvm_dev *dev = tgt_dev->parent;
 100         struct nvm_dev_map *dev_map = tgt_dev->map;
 101         int i, j;
 102
 103         for (i = 0; i < dev_map->nr_chnls; i++) {
 104                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 105                 int *lun_offs = ch_map->lun_offs;
 106                 int ch = i + ch_map->ch_off;
 107
 108                 for (j = 0; j < ch_map->nr_luns; j++) {
 109                         int lun = j + lun_offs[j];
 110                         int lunid = (ch * dev->geo.luns_per_chnl) + lun;
 111
 112                         WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
 113                 }
 114
 115                 kfree(ch_map->lun_offs);
 116         }
 117
 118         kfree(dev_map->chnls);
 119         kfree(dev_map);
 120
 121         kfree(tgt_dev->luns);
 122         kfree(tgt_dev);
 123 }
 124
 125 static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
 126                                               int lun_begin, int lun_end)
 127 {
 128         struct nvm_tgt_dev *tgt_dev = NULL;
 129         struct nvm_dev_map *dev_rmap = dev->rmap;
 130         struct nvm_dev_map *dev_map;
 131         struct ppa_addr *luns;
 132         int nr_luns = lun_end - lun_begin + 1;
 133         int luns_left = nr_luns;
 134         int nr_chnls = nr_luns / dev->geo.luns_per_chnl;
 135         int nr_chnls_mod = nr_luns % dev->geo.luns_per_chnl;
 136         int bch = lun_begin / dev->geo.luns_per_chnl;
 137         int blun = lun_begin % dev->geo.luns_per_chnl;
 138         int lunid = 0;
 139         int lun_balanced = 1;
 140         int prev_nr_luns;
 141         int i, j;
 142
 143         nr_chnls = nr_luns / dev->geo.luns_per_chnl;
 144         nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1;
 145
 146         dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 147         if (!dev_map)
 148                 goto err_dev;
 149
 150         dev_map->chnls = kcalloc(nr_chnls, sizeof(struct nvm_ch_map),
 151                                                                 GFP_KERNEL);
 152         if (!dev_map->chnls)
 153                 goto err_chnls;
 154
 155         luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL);
 156         if (!luns)
 157                 goto err_luns;
 158
 159         prev_nr_luns = (luns_left > dev->geo.luns_per_chnl) ?
 160                                         dev->geo.luns_per_chnl : luns_left;
 161         for (i = 0; i < nr_chnls; i++) {
 162                 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
 163                 int *lun_roffs = ch_rmap->lun_offs;
 164                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 165                 int *lun_offs;
 166                 int luns_in_chnl = (luns_left > dev->geo.luns_per_chnl) ?
 167                                         dev->geo.luns_per_chnl : luns_left;
 168
 169                 if (lun_balanced && prev_nr_luns != luns_in_chnl)
 170                         lun_balanced = 0;
 171
 172                 ch_map->ch_off = ch_rmap->ch_off = bch;
 173                 ch_map->nr_luns = luns_in_chnl;
 174
 175                 lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 176                 if (!lun_offs)
 177                         goto err_ch;
 178
 179                 for (j = 0; j < luns_in_chnl; j++) {
 180                         luns[lunid].ppa = 0;
 181                         luns[lunid].g.ch = i;
 182                         luns[lunid++].g.lun = j;
 183
 184                         lun_offs[j] = blun;
 185                         lun_roffs[j + blun] = blun;
 186                 }
 187
 188                 ch_map->lun_offs = lun_offs;
 189
 190                 /* when starting a new channel, lun offset is reset */
 191                 blun = 0;
 192                 luns_left -= luns_in_chnl;
 193         }
 194
 195         dev_map->nr_chnls = nr_chnls;
 196
 197         tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
 198         if (!tgt_dev)
 199                 goto err_ch;
 200
 201         memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
 202         /* Target device only owns a portion of the physical device */
 203         tgt_dev->geo.nr_chnls = nr_chnls;
 204         tgt_dev->geo.nr_luns = nr_luns;
 205         tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1;
 206         tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun;
 207         tgt_dev->q = dev->q;
 208         tgt_dev->map = dev_map;
 209         tgt_dev->luns = luns;
 210         memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id));
 211
 212         tgt_dev->parent = dev;
 213
 214         return tgt_dev;
 215 err_ch:
 216         while (--i > 0)
 217                 kfree(dev_map->chnls[i].lun_offs);
 218         kfree(luns);
 219 err_luns:
 220         kfree(dev_map->chnls);
 221 err_chnls:
 222         kfree(dev_map);
 223 err_dev:
 224         return tgt_dev;
 225 }
 226
 227 static const struct block_device_operations nvm_fops = {
 228         .owner          = THIS_MODULE,
 229 };
 230
 231 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 232 {
 233         struct nvm_ioctl_create_simple *s = &create->conf.s;
 234         struct request_queue *tqueue;
 235         struct gendisk *tdisk;
 236         struct nvm_tgt_type *tt;
 237         struct nvm_target *t;
 238         struct nvm_tgt_dev *tgt_dev;
 239         void *targetdata;
 240
 241         tt = nvm_find_target_type(create->tgttype, 1);
 242         if (!tt) {
 243                 pr_err("nvm: target type %s not found\n", create->tgttype);
 244                 return -EINVAL;
 245         }
 246
 247         mutex_lock(&dev->mlock);
 248         t = nvm_find_target(dev, create->tgtname);
 249         if (t) {
 250                 pr_err("nvm: target name already exists.\n");
 251                 mutex_unlock(&dev->mlock);
 252                 return -EINVAL;
 253         }
 254         mutex_unlock(&dev->mlock);
 255
 256         if (nvm_reserve_luns(dev, s->lun_begin, s->lun_end))
 257                 return -ENOMEM;
 258
 259         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 260         if (!t)
 261                 goto err_reserve;
 262
 263         tgt_dev = nvm_create_tgt_dev(dev, s->lun_begin, s->lun_end);
 264         if (!tgt_dev) {
 265                 pr_err("nvm: could not create target device\n");
 266                 goto err_t;
 267         }
 268
 269         tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
 270         if (!tqueue)
 271                 goto err_dev;
 272         blk_queue_make_request(tqueue, tt->make_rq);
 273
 274         tdisk = alloc_disk(0);
 275         if (!tdisk)
 276                 goto err_queue;
 277
 278         sprintf(tdisk->disk_name, "%s", create->tgtname);
 279         tdisk->flags = GENHD_FL_EXT_DEVT;
 280         tdisk->major = 0;
 281         tdisk->first_minor = 0;
 282         tdisk->fops = &nvm_fops;
 283         tdisk->queue = tqueue;
 284
 285         targetdata = tt->init(tgt_dev, tdisk);
 286         if (IS_ERR(targetdata))
 287                 goto err_init;
 288
 289         tdisk->private_data = targetdata;
 290         tqueue->queuedata = targetdata;
 291
 292         blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
 293
 294         set_capacity(tdisk, tt->capacity(targetdata));
 295         add_disk(tdisk);
 296
 297         t->type = tt;
 298         t->disk = tdisk;
 299         t->dev = tgt_dev;
 300
 301         mutex_lock(&dev->mlock);
 302         list_add_tail(&t->list, &dev->targets);
 303         mutex_unlock(&dev->mlock);
 304
 305         return 0;
 306 err_init:
 307         put_disk(tdisk);
 308 err_queue:
 309         blk_cleanup_queue(tqueue);
 310 err_dev:
 311         kfree(tgt_dev);
 312 err_t:
 313         kfree(t);
 314 err_reserve:
 315         nvm_release_luns_err(dev, s->lun_begin, s->lun_end);
 316         return -ENOMEM;
 317 }
 318
 319 static void __nvm_remove_target(struct nvm_target *t)
 320 {
 321         struct nvm_tgt_type *tt = t->type;
 322         struct gendisk *tdisk = t->disk;
 323         struct request_queue *q = tdisk->queue;
 324
 325         del_gendisk(tdisk);
 326         blk_cleanup_queue(q);
 327
 328         if (tt->exit)
 329                 tt->exit(tdisk->private_data);
 330
 331         nvm_remove_tgt_dev(t->dev);
 332         put_disk(tdisk);
 333
 334         list_del(&t->list);
 335         kfree(t);
 336 }
 337
 338 /**
 339  * nvm_remove_tgt - Removes a target from the media manager
 340  * @dev:        device
 341  * @remove:     ioctl structure with target name to remove.
 342  *
 343  * Returns:
 344  * 0: on success
 345  * 1: on not found
 346  * <0: on error
 347  */
 348 static int nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
 349 {
 350         struct nvm_target *t;
 351
 352         mutex_lock(&dev->mlock);
 353         t = nvm_find_target(dev, remove->tgtname);
 354         if (!t) {
 355                 mutex_unlock(&dev->mlock);
 356                 return 1;
 357         }
 358         __nvm_remove_target(t);
 359         mutex_unlock(&dev->mlock);
 360
 361         return 0;
 362 }
 363
 364 static int nvm_register_map(struct nvm_dev *dev)
 365 {
 366         struct nvm_dev_map *rmap;
 367         int i, j;
 368
 369         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 370         if (!rmap)
 371                 goto err_rmap;
 372
 373         rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct nvm_ch_map),
 374                                                                 GFP_KERNEL);
 375         if (!rmap->chnls)
 376                 goto err_chnls;
 377
 378         for (i = 0; i < dev->geo.nr_chnls; i++) {
 379                 struct nvm_ch_map *ch_rmap;
 380                 int *lun_roffs;
 381                 int luns_in_chnl = dev->geo.luns_per_chnl;
 382
 383                 ch_rmap = &rmap->chnls[i];
 384
 385                 ch_rmap->ch_off = -1;
 386                 ch_rmap->nr_luns = luns_in_chnl;
 387
 388                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 389                 if (!lun_roffs)
 390                         goto err_ch;
 391
 392                 for (j = 0; j < luns_in_chnl; j++)
 393                         lun_roffs[j] = -1;
 394
 395                 ch_rmap->lun_offs = lun_roffs;
 396         }
 397
 398         dev->rmap = rmap;
 399
 400         return 0;
 401 err_ch:
 402         while (--i >= 0)
 403                 kfree(rmap->chnls[i].lun_offs);
 404 err_chnls:
 405         kfree(rmap);
 406 err_rmap:
 407         return -ENOMEM;
 408 }
 409
 410 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 411 {
 412         struct nvm_dev_map *dev_map = tgt_dev->map;
 413         struct nvm_ch_map *ch_map = &dev_map->chnls[p->g.ch];
 414         int lun_off = ch_map->lun_offs[p->g.lun];
 415
 416         p->g.ch += ch_map->ch_off;
 417         p->g.lun += lun_off;
 418 }
 419
 420 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 421 {
 422         struct nvm_dev *dev = tgt_dev->parent;
 423         struct nvm_dev_map *dev_rmap = dev->rmap;
 424         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
 425         int lun_roff = ch_rmap->lun_offs[p->g.lun];
 426
 427         p->g.ch -= ch_rmap->ch_off;
 428         p->g.lun -= lun_roff;
 429 }
 430
 431 static void nvm_trans_rq(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 432                         int flag)
 433 {
 434         int i;
 435
 436         if (rqd->nr_ppas == 1) {
 437                 if (flag == TRANS_TGT_TO_DEV)
 438                         nvm_map_to_dev(tgt_dev, &rqd->ppa_addr);
 439                 else
 440                         nvm_map_to_tgt(tgt_dev, &rqd->ppa_addr);
 441                 return;
 442         }
 443
 444         for (i = 0; i < rqd->nr_ppas; i++) {
 445                 if (flag == TRANS_TGT_TO_DEV)
 446                         nvm_map_to_dev(tgt_dev, &rqd->ppa_list[i]);
 447                 else
 448                         nvm_map_to_tgt(tgt_dev, &rqd->ppa_list[i]);
 449         }
 450 }
 451
 452 static struct ppa_addr nvm_trans_ppa(struct nvm_tgt_dev *tgt_dev,
 453                                      struct ppa_addr p, int dir)
 454 {
 455         struct ppa_addr ppa = p;
 456
 457         if (dir == TRANS_TGT_TO_DEV)
 458                 nvm_map_to_dev(tgt_dev, &ppa);
 459         else
 460                 nvm_map_to_tgt(tgt_dev, &ppa);
 461
 462         return ppa;
 463 }
 464
 465 void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
 466                      int len)
 467 {
 468         struct nvm_geo *geo = &dev->geo;
 469         struct nvm_dev_map *dev_rmap = dev->rmap;
 470         u64 i;
 471
 472         for (i = 0; i < len; i++) {
 473                 struct nvm_ch_map *ch_rmap;
 474                 int *lun_roffs;
 475                 struct ppa_addr gaddr;
 476                 u64 pba = le64_to_cpu(entries[i]);
 477                 int off;
 478                 u64 diff;
 479
 480                 if (!pba)
 481                         continue;
 482
 483                 gaddr = linear_to_generic_addr(geo, pba);
 484                 ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
 485                 lun_roffs = ch_rmap->lun_offs;
 486
 487                 off = gaddr.g.ch * geo->luns_per_chnl + gaddr.g.lun;
 488
 489                 diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
 490                                 (lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
 491
 492                 entries[i] -= cpu_to_le64(diff);
 493         }
 494 }
 495 EXPORT_SYMBOL(nvm_part_to_tgt);
 496
 497 struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
 498 {
 499         struct nvm_tgt_type *tmp, *tt = NULL;
 500
 501         if (lock)
 502                 down_write(&nvm_tgtt_lock);
 503
 504         list_for_each_entry(tmp, &nvm_tgt_types, list)
 505                 if (!strcmp(name, tmp->name)) {
 506                         tt = tmp;
 507                         break;
 508                 }
 509
 510         if (lock)
 511                 up_write(&nvm_tgtt_lock);
 512         return tt;
 513 }
 514 EXPORT_SYMBOL(nvm_find_target_type);
 515
 516 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 517 {
 518         int ret = 0;
 519
 520         down_write(&nvm_tgtt_lock);
 521         if (nvm_find_target_type(tt->name, 0))
 522                 ret = -EEXIST;
 523         else
 524                 list_add(&tt->list, &nvm_tgt_types);
 525         up_write(&nvm_tgtt_lock);
 526
 527         return ret;
 528 }
 529 EXPORT_SYMBOL(nvm_register_tgt_type);
 530
 531 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 532 {
 533         if (!tt)
 534                 return;
 535
 536         down_write(&nvm_lock);
 537         list_del(&tt->list);
 538         up_write(&nvm_lock);
 539 }
 540 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 541
 542 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 543                                                         dma_addr_t *dma_handler)
 544 {
 545         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 546                                                                 dma_handler);
 547 }
 548 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 549
 550 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 551 {
 552         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 553 }
 554 EXPORT_SYMBOL(nvm_dev_dma_free);
 555
 556 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 557 {
 558         struct nvm_dev *dev;
 559
 560         list_for_each_entry(dev, &nvm_devices, devices)
 561                 if (!strcmp(name, dev->name))
 562                         return dev;
 563
 564         return NULL;
 565 }
 566
 567 static void nvm_tgt_generic_to_addr_mode(struct nvm_tgt_dev *tgt_dev,
 568                                          struct nvm_rq *rqd)
 569 {
 570         struct nvm_dev *dev = tgt_dev->parent;
 571         int i;
 572
 573         if (rqd->nr_ppas > 1) {
 574                 for (i = 0; i < rqd->nr_ppas; i++) {
 575                         rqd->ppa_list[i] = nvm_trans_ppa(tgt_dev,
 576                                         rqd->ppa_list[i], TRANS_TGT_TO_DEV);
 577                         rqd->ppa_list[i] = generic_to_dev_addr(dev,
 578                                                         rqd->ppa_list[i]);
 579                 }
 580         } else {
 581                 rqd->ppa_addr = nvm_trans_ppa(tgt_dev, rqd->ppa_addr,
 582                                                 TRANS_TGT_TO_DEV);
 583                 rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
 584         }
 585 }
 586
 587 int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
 588                        int nr_ppas, int type)
 589 {
 590         struct nvm_dev *dev = tgt_dev->parent;
 591         struct nvm_rq rqd;
 592         int ret;
 593
 594         if (nr_ppas > dev->ops->max_phys_sect) {
 595                 pr_err("nvm: unable to update all blocks atomically\n");
 596                 return -EINVAL;
 597         }
 598
 599         memset(&rqd, 0, sizeof(struct nvm_rq));
 600
 601         nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas, 1);
 602         nvm_tgt_generic_to_addr_mode(tgt_dev, &rqd);
 603
 604         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
 605         nvm_free_rqd_ppalist(dev, &rqd);
 606         if (ret) {
 607                 pr_err("nvm: failed bb mark\n");
 608                 return -EINVAL;
 609         }
 610
 611         return 0;
 612 }
 613 EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
 614
 615 int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
 616 {
 617         struct nvm_dev *dev = tgt_dev->parent;
 618
 619         return dev->ops->max_phys_sect;
 620 }
 621 EXPORT_SYMBOL(nvm_max_phys_sects);
 622
 623 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 624 {
 625         struct nvm_dev *dev = tgt_dev->parent;
 626
 627         if (!dev->ops->submit_io)
 628                 return -ENODEV;
 629
 630         /* Convert address space */
 631         nvm_generic_to_addr_mode(dev, rqd);
 632
 633         rqd->dev = tgt_dev;
 634         return dev->ops->submit_io(dev, rqd);
 635 }
 636 EXPORT_SYMBOL(nvm_submit_io);
 637
 638 int nvm_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int flags)
 639 {
 640         struct nvm_dev *dev = tgt_dev->parent;
 641         struct nvm_rq rqd;
 642         int ret;
 643
 644         if (!dev->ops->erase_block)
 645                 return 0;
 646
 647         nvm_map_to_dev(tgt_dev, ppas);
 648
 649         memset(&rqd, 0, sizeof(struct nvm_rq));
 650
 651         ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, 1, 1);
 652         if (ret)
 653                 return ret;
 654
 655         nvm_generic_to_addr_mode(dev, &rqd);
 656
 657         rqd.flags = flags;
 658
 659         ret = dev->ops->erase_block(dev, &rqd);
 660
 661         nvm_free_rqd_ppalist(dev, &rqd);
 662
 663         return ret;
 664 }
 665 EXPORT_SYMBOL(nvm_erase_blk);
 666
 667 int nvm_get_l2p_tbl(struct nvm_tgt_dev *tgt_dev, u64 slba, u32 nlb,
 668                     nvm_l2p_update_fn *update_l2p, void *priv)
 669 {
 670         struct nvm_dev *dev = tgt_dev->parent;
 671
 672         if (!dev->ops->get_l2p_tbl)
 673                 return 0;
 674
 675         return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
 676 }
 677 EXPORT_SYMBOL(nvm_get_l2p_tbl);
 678
 679 int nvm_get_area(struct nvm_tgt_dev *tgt_dev, sector_t *lba, sector_t len)
 680 {
 681         struct nvm_dev *dev = tgt_dev->parent;
 682         struct nvm_geo *geo = &dev->geo;
 683         struct nvm_area *area, *prev, *next;
 684         sector_t begin = 0;
 685         sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9;
 686
 687         if (len > max_sectors)
 688                 return -EINVAL;
 689
 690         area = kmalloc(sizeof(struct nvm_area), GFP_KERNEL);
 691         if (!area)
 692                 return -ENOMEM;
 693
 694         prev = NULL;
 695
 696         spin_lock(&dev->lock);
 697         list_for_each_entry(next, &dev->area_list, list) {
 698                 if (begin + len > next->begin) {
 699                         begin = next->end;
 700                         prev = next;
 701                         continue;
 702                 }
 703                 break;
 704         }
 705
 706         if ((begin + len) > max_sectors) {
 707                 spin_unlock(&dev->lock);
 708                 kfree(area);
 709                 return -EINVAL;
 710         }
 711
 712         area->begin = *lba = begin;
 713         area->end = begin + len;
 714
 715         if (prev) /* insert into sorted order */
 716                 list_add(&area->list, &prev->list);
 717         else
 718                 list_add(&area->list, &dev->area_list);
 719         spin_unlock(&dev->lock);
 720
 721         return 0;
 722 }
 723 EXPORT_SYMBOL(nvm_get_area);
 724
 725 void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin)
 726 {
 727         struct nvm_dev *dev = tgt_dev->parent;
 728         struct nvm_area *area;
 729
 730         spin_lock(&dev->lock);
 731         list_for_each_entry(area, &dev->area_list, list) {
 732                 if (area->begin != begin)
 733                         continue;
 734
 735                 list_del(&area->list);
 736                 spin_unlock(&dev->lock);
 737                 kfree(area);
 738                 return;
 739         }
 740         spin_unlock(&dev->lock);
 741 }
 742 EXPORT_SYMBOL(nvm_put_area);
 743
 744 void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 745 {
 746         int i;
 747
 748         if (rqd->nr_ppas > 1) {
 749                 for (i = 0; i < rqd->nr_ppas; i++)
 750                         rqd->ppa_list[i] = dev_to_generic_addr(dev,
 751                                                         rqd->ppa_list[i]);
 752         } else {
 753                 rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr);
 754         }
 755 }
 756 EXPORT_SYMBOL(nvm_addr_to_generic_mode);
 757
 758 void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 759 {
 760         int i;
 761
 762         if (rqd->nr_ppas > 1) {
 763                 for (i = 0; i < rqd->nr_ppas; i++)
 764                         rqd->ppa_list[i] = generic_to_dev_addr(dev,
 765                                                         rqd->ppa_list[i]);
 766         } else {
 767                 rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
 768         }
 769 }
 770 EXPORT_SYMBOL(nvm_generic_to_addr_mode);
 771
 772 int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
 773                         const struct ppa_addr *ppas, int nr_ppas, int vblk)
 774 {
 775         struct nvm_geo *geo = &dev->geo;
 776         int i, plane_cnt, pl_idx;
 777         struct ppa_addr ppa;
 778
 779         if ((!vblk || geo->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) {
 780                 rqd->nr_ppas = nr_ppas;
 781                 rqd->ppa_addr = ppas[0];
 782
 783                 return 0;
 784         }
 785
 786         rqd->nr_ppas = nr_ppas;
 787         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 788         if (!rqd->ppa_list) {
 789                 pr_err("nvm: failed to allocate dma memory\n");
 790                 return -ENOMEM;
 791         }
 792
 793         if (!vblk) {
 794                 for (i = 0; i < nr_ppas; i++)
 795                         rqd->ppa_list[i] = ppas[i];
 796         } else {
 797                 plane_cnt = geo->plane_mode;
 798                 rqd->nr_ppas *= plane_cnt;
 799
 800                 for (i = 0; i < nr_ppas; i++) {
 801                         for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 802                                 ppa = ppas[i];
 803                                 ppa.g.pl = pl_idx;
 804                                 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 805                         }
 806                 }
 807         }
 808
 809         return 0;
 810 }
 811 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
 812
 813 void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
 814 {
 815         if (!rqd->ppa_list)
 816                 return;
 817
 818         nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
 819 }
 820 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
 821
 822 void nvm_end_io(struct nvm_rq *rqd, int error)
 823 {
 824         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 825         struct nvm_tgt_instance *ins = rqd->ins;
 826
 827         /* Convert address space */
 828         if (tgt_dev)
 829                 nvm_trans_rq(tgt_dev, rqd, TRANS_DEV_TO_TGT);
 830
 831         rqd->error = error;
 832         ins->tt->end_io(rqd);
 833 }
 834 EXPORT_SYMBOL(nvm_end_io);
 835
 836 /*
 837  * folds a bad block list from its plane representation to its virtual
 838  * block representation. The fold is done in place and reduced size is
 839  * returned.
 840  *
 841  * If any of the planes status are bad or grown bad block, the virtual block
 842  * is marked bad. If not bad, the first plane state acts as the block state.
 843  */
 844 int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
 845 {
 846         struct nvm_geo *geo = &dev->geo;
 847         int blk, offset, pl, blktype;
 848
 849         if (nr_blks != geo->blks_per_lun * geo->plane_mode)
 850                 return -EINVAL;
 851
 852         for (blk = 0; blk < geo->blks_per_lun; blk++) {
 853                 offset = blk * geo->plane_mode;
 854                 blktype = blks[offset];
 855
 856                 /* Bad blocks on any planes take precedence over other types */
 857                 for (pl = 0; pl < geo->plane_mode; pl++) {
 858                         if (blks[offset + pl] &
 859                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 860                                 blktype = blks[offset + pl];
 861                                 break;
 862                         }
 863                 }
 864
 865                 blks[blk] = blktype;
 866         }
 867
 868         return geo->blks_per_lun;
 869 }
 870 EXPORT_SYMBOL(nvm_bb_tbl_fold);
 871
 872 int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 873                        u8 *blks)
 874 {
 875         struct nvm_dev *dev = tgt_dev->parent;
 876
 877         ppa = nvm_trans_ppa(tgt_dev, ppa, TRANS_TGT_TO_DEV);
 878         ppa = generic_to_dev_addr(dev, ppa);
 879
 880         return dev->ops->get_bb_tbl(dev, ppa, blks);
 881 }
 882 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 883
 884 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 885 {
 886         struct nvm_geo *geo = &dev->geo;
 887         int i;
 888
 889         dev->lps_per_blk = geo->pgs_per_blk;
 890         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 891         if (!dev->lptbl)
 892                 return -ENOMEM;
 893
 894         /* Just a linear array */
 895         for (i = 0; i < dev->lps_per_blk; i++)
 896                 dev->lptbl[i] = i;
 897
 898         return 0;
 899 }
 900
 901 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 902 {
 903         int i, p;
 904         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 905
 906         if (!mlc->num_pairs)
 907                 return 0;
 908
 909         dev->lps_per_blk = mlc->num_pairs;
 910         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 911         if (!dev->lptbl)
 912                 return -ENOMEM;
 913
 914         /* The lower page table encoding consists of a list of bytes, where each
 915          * has a lower and an upper half. The first half byte maintains the
 916          * increment value and every value after is an offset added to the
 917          * previous incrementation value
 918          */
 919         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 920         for (i = 1; i < dev->lps_per_blk; i++) {
 921                 p = mlc->pairs[i >> 1];
 922                 if (i & 0x1) /* upper */
 923                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 924                 else /* lower */
 925                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 926         }
 927
 928         return 0;
 929 }
 930
 931 static int nvm_core_init(struct nvm_dev *dev)
 932 {
 933         struct nvm_id *id = &dev->identity;
 934         struct nvm_id_group *grp = &id->groups[0];
 935         struct nvm_geo *geo = &dev->geo;
 936         int ret;
 937
 938         /* Whole device values */
 939         geo->nr_chnls = grp->num_ch;
 940         geo->luns_per_chnl = grp->num_lun;
 941
 942         /* Generic device values */
 943         geo->pgs_per_blk = grp->num_pg;
 944         geo->blks_per_lun = grp->num_blk;
 945         geo->nr_planes = grp->num_pln;
 946         geo->fpg_size = grp->fpg_sz;
 947         geo->pfpg_size = grp->fpg_sz * grp->num_pln;
 948         geo->sec_size = grp->csecs;
 949         geo->oob_size = grp->sos;
 950         geo->sec_per_pg = grp->fpg_sz / grp->csecs;
 951         geo->mccap = grp->mccap;
 952         memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 953
 954         geo->plane_mode = NVM_PLANE_SINGLE;
 955         geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
 956
 957         if (grp->mpos & 0x020202)
 958                 geo->plane_mode = NVM_PLANE_DOUBLE;
 959         if (grp->mpos & 0x040404)
 960                 geo->plane_mode = NVM_PLANE_QUAD;
 961
 962         if (grp->mtype != 0) {
 963                 pr_err("nvm: memory type not supported\n");
 964                 return -EINVAL;
 965         }
 966
 967         /* calculated values */
 968         geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
 969         geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
 970         geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
 971         geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
 972
 973         dev->total_secs = geo->nr_luns * geo->sec_per_lun;
 974         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->nr_luns),
 975                                         sizeof(unsigned long), GFP_KERNEL);
 976         if (!dev->lun_map)
 977                 return -ENOMEM;
 978
 979         switch (grp->fmtype) {
 980         case NVM_ID_FMTYPE_SLC:
 981                 if (nvm_init_slc_tbl(dev, grp)) {
 982                         ret = -ENOMEM;
 983                         goto err_fmtype;
 984                 }
 985                 break;
 986         case NVM_ID_FMTYPE_MLC:
 987                 if (nvm_init_mlc_tbl(dev, grp)) {
 988                         ret = -ENOMEM;
 989                         goto err_fmtype;
 990                 }
 991                 break;
 992         default:
 993                 pr_err("nvm: flash type not supported\n");
 994                 ret = -EINVAL;
 995                 goto err_fmtype;
 996         }
 997
 998         INIT_LIST_HEAD(&dev->area_list);
 999         INIT_LIST_HEAD(&dev->targets);
1000         mutex_init(&dev->mlock);
1001         spin_lock_init(&dev->lock);
1002
1003         ret = nvm_register_map(dev);
1004         if (ret)
1005                 goto err_fmtype;
1006
1007         blk_queue_logical_block_size(dev->q, geo->sec_size);
1008         return 0;
1009 err_fmtype:
1010         kfree(dev->lun_map);
1011         return ret;
1012 }
1013
1014 void nvm_free(struct nvm_dev *dev)
1015 {
1016         if (!dev)
1017                 return;
1018
1019         if (dev->dma_pool)
1020                 dev->ops->destroy_dma_pool(dev->dma_pool);
1021
1022         kfree(dev->rmap);
1023         kfree(dev->lptbl);
1024         kfree(dev->lun_map);
1025         kfree(dev);
1026 }
1027
1028 static int nvm_init(struct nvm_dev *dev)
1029 {
1030         struct nvm_geo *geo = &dev->geo;
1031         int ret = -EINVAL;
1032
1033         if (dev->ops->identity(dev, &dev->identity)) {
1034                 pr_err("nvm: device could not be identified\n");
1035                 goto err;
1036         }
1037
1038         pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
1039                         dev->identity.ver_id, dev->identity.vmnt,
1040                                                         dev->identity.cgrps);
1041
1042         if (dev->identity.ver_id != 1) {
1043                 pr_err("nvm: device not supported by kernel.");
1044                 goto err;
1045         }
1046
1047         if (dev->identity.cgrps != 1) {
1048                 pr_err("nvm: only one group configuration supported.");
1049                 goto err;
1050         }
1051
1052         ret = nvm_core_init(dev);
1053         if (ret) {
1054                 pr_err("nvm: could not initialize core structures.\n");
1055                 goto err;
1056         }
1057
1058         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
1059                         dev->name, geo->sec_per_pg, geo->nr_planes,
1060                         geo->pgs_per_blk, geo->blks_per_lun,
1061                         geo->nr_luns, geo->nr_chnls);
1062         return 0;
1063 err:
1064         pr_err("nvm: failed to initialize nvm\n");
1065         return ret;
1066 }
1067
1068 struct nvm_dev *nvm_alloc_dev(int node)
1069 {
1070         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1071 }
1072 EXPORT_SYMBOL(nvm_alloc_dev);
1073
1074 int nvm_register(struct nvm_dev *dev)
1075 {
1076         int ret;
1077
1078         if (!dev->q || !dev->ops)
1079                 return -EINVAL;
1080
1081         if (dev->ops->max_phys_sect > 256) {
1082                 pr_info("nvm: max sectors supported is 256.\n");
1083                 return -EINVAL;
1084         }
1085
1086         if (dev->ops->max_phys_sect > 1) {
1087                 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1088                 if (!dev->dma_pool) {
1089                         pr_err("nvm: could not create dma pool\n");
1090                         return -ENOMEM;
1091                 }
1092         }
1093
1094         ret = nvm_init(dev);
1095         if (ret)
1096                 goto err_init;
1097
1098         /* register device with a supported media manager */
1099         down_write(&nvm_lock);
1100         list_add(&dev->devices, &nvm_devices);
1101         up_write(&nvm_lock);
1102
1103         return 0;
1104 err_init:
1105         dev->ops->destroy_dma_pool(dev->dma_pool);
1106         return ret;
1107 }
1108 EXPORT_SYMBOL(nvm_register);
1109
1110 void nvm_unregister(struct nvm_dev *dev)
1111 {
1112         struct nvm_target *t, *tmp;
1113
1114         mutex_lock(&dev->mlock);
1115         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1116                 if (t->dev->parent != dev)
1117                         continue;
1118                 __nvm_remove_target(t);
1119         }
1120         mutex_unlock(&dev->mlock);
1121
1122         down_write(&nvm_lock);
1123         list_del(&dev->devices);
1124         up_write(&nvm_lock);
1125
1126         nvm_free(dev);
1127 }
1128 EXPORT_SYMBOL(nvm_unregister);
1129
1130 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1131 {
1132         struct nvm_dev *dev;
1133         struct nvm_ioctl_create_simple *s;
1134
1135         down_write(&nvm_lock);
1136         dev = nvm_find_nvm_dev(create->dev);
1137         up_write(&nvm_lock);
1138
1139         if (!dev) {
1140                 pr_err("nvm: device not found\n");
1141                 return -EINVAL;
1142         }
1143
1144         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
1145                 pr_err("nvm: config type not valid\n");
1146                 return -EINVAL;
1147         }
1148         s = &create->conf.s;
1149
1150         if (s->lun_begin > s->lun_end || s->lun_end > dev->geo.nr_luns) {
1151                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
1152                         s->lun_begin, s->lun_end, dev->geo.nr_luns);
1153                 return -EINVAL;
1154         }
1155
1156         return nvm_create_tgt(dev, create);
1157 }
1158
1159 static long nvm_ioctl_info(struct file *file, void __user *arg)
1160 {
1161         struct nvm_ioctl_info *info;
1162         struct nvm_tgt_type *tt;
1163         int tgt_iter = 0;
1164
1165         if (!capable(CAP_SYS_ADMIN))
1166                 return -EPERM;
1167
1168         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1169         if (IS_ERR(info))
1170                 return -EFAULT;
1171
1172         info->version[0] = NVM_VERSION_MAJOR;
1173         info->version[1] = NVM_VERSION_MINOR;
1174         info->version[2] = NVM_VERSION_PATCH;
1175
1176         down_write(&nvm_lock);
1177         list_for_each_entry(tt, &nvm_tgt_types, list) {
1178                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1179
1180                 tgt->version[0] = tt->version[0];
1181                 tgt->version[1] = tt->version[1];
1182                 tgt->version[2] = tt->version[2];
1183                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1184
1185                 tgt_iter++;
1186         }
1187
1188         info->tgtsize = tgt_iter;
1189         up_write(&nvm_lock);
1190
1191         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1192                 kfree(info);
1193                 return -EFAULT;
1194         }
1195
1196         kfree(info);
1197         return 0;
1198 }
1199
1200 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1201 {
1202         struct nvm_ioctl_get_devices *devices;
1203         struct nvm_dev *dev;
1204         int i = 0;
1205
1206         if (!capable(CAP_SYS_ADMIN))
1207                 return -EPERM;
1208
1209         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1210         if (!devices)
1211                 return -ENOMEM;
1212
1213         down_write(&nvm_lock);
1214         list_for_each_entry(dev, &nvm_devices, devices) {
1215                 struct nvm_ioctl_device_info *info = &devices->info[i];
1216
1217                 sprintf(info->devname, "%s", dev->name);
1218
1219                 /* kept for compatibility */
1220                 info->bmversion[0] = 1;
1221                 info->bmversion[1] = 0;
1222                 info->bmversion[2] = 0;
1223                 sprintf(info->bmname, "%s", "gennvm");
1224                 i++;
1225
1226                 if (i > 31) {
1227                         pr_err("nvm: max 31 devices can be reported.\n");
1228                         break;
1229                 }
1230         }
1231         up_write(&nvm_lock);
1232
1233         devices->nr_devices = i;
1234
1235         if (copy_to_user(arg, devices,
1236                          sizeof(struct nvm_ioctl_get_devices))) {
1237                 kfree(devices);
1238                 return -EFAULT;
1239         }
1240
1241         kfree(devices);
1242         return 0;
1243 }
1244
1245 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1246 {
1247         struct nvm_ioctl_create create;
1248
1249         if (!capable(CAP_SYS_ADMIN))
1250                 return -EPERM;
1251
1252         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1253                 return -EFAULT;
1254
1255         create.dev[DISK_NAME_LEN - 1] = '\0';
1256         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1257         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1258
1259         if (create.flags != 0) {
1260                 pr_err("nvm: no flags supported\n");
1261                 return -EINVAL;
1262         }
1263
1264         return __nvm_configure_create(&create);
1265 }
1266
1267 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1268 {
1269         struct nvm_ioctl_remove remove;
1270         struct nvm_dev *dev;
1271         int ret = 0;
1272
1273         if (!capable(CAP_SYS_ADMIN))
1274                 return -EPERM;
1275
1276         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1277                 return -EFAULT;
1278
1279         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1280
1281         if (remove.flags != 0) {
1282                 pr_err("nvm: no flags supported\n");
1283                 return -EINVAL;
1284         }
1285
1286         list_for_each_entry(dev, &nvm_devices, devices) {
1287                 ret = nvm_remove_tgt(dev, &remove);
1288                 if (!ret)
1289                         break;
1290         }
1291
1292         return ret;
1293 }
1294
1295 /* kept for compatibility reasons */
1296 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1297 {
1298         struct nvm_ioctl_dev_init init;
1299
1300         if (!capable(CAP_SYS_ADMIN))
1301                 return -EPERM;
1302
1303         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1304                 return -EFAULT;
1305
1306         if (init.flags != 0) {
1307                 pr_err("nvm: no flags supported\n");
1308                 return -EINVAL;
1309         }
1310
1311         return 0;
1312 }
1313
1314 /* Kept for compatibility reasons */
1315 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1316 {
1317         struct nvm_ioctl_dev_factory fact;
1318
1319         if (!capable(CAP_SYS_ADMIN))
1320                 return -EPERM;
1321
1322         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1323                 return -EFAULT;
1324
1325         fact.dev[DISK_NAME_LEN - 1] = '\0';
1326
1327         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1328                 return -EINVAL;
1329
1330         return 0;
1331 }
1332
1333 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1334 {
1335         void __user *argp = (void __user *)arg;
1336
1337         switch (cmd) {
1338         case NVM_INFO:
1339                 return nvm_ioctl_info(file, argp);
1340         case NVM_GET_DEVICES:
1341                 return nvm_ioctl_get_devices(file, argp);
1342         case NVM_DEV_CREATE:
1343                 return nvm_ioctl_dev_create(file, argp);
1344         case NVM_DEV_REMOVE:
1345                 return nvm_ioctl_dev_remove(file, argp);
1346         case NVM_DEV_INIT:
1347                 return nvm_ioctl_dev_init(file, argp);
1348         case NVM_DEV_FACTORY:
1349                 return nvm_ioctl_dev_factory(file, argp);
1350         }
1351         return 0;
1352 }
1353
1354 static const struct file_operations _ctl_fops = {
1355         .open = nonseekable_open,
1356         .unlocked_ioctl = nvm_ctl_ioctl,
1357         .owner = THIS_MODULE,
1358         .llseek  = noop_llseek,
1359 };
1360
1361 static struct miscdevice _nvm_misc = {
1362         .minor          = MISC_DYNAMIC_MINOR,
1363         .name           = "lightnvm",
1364         .nodename       = "lightnvm/control",
1365         .fops           = &_ctl_fops,
1366 };
1367 builtin_misc_device(_nvm_misc);