drivers/lightnvm/core.c

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