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/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/lightnvm.h>
  29 #include <linux/sched/sysctl.h>
  30
  31 static LIST_HEAD(nvm_tgt_types);
  32 static DECLARE_RWSEM(nvm_tgtt_lock);
  33 static LIST_HEAD(nvm_devices);
  34 static DECLARE_RWSEM(nvm_lock);
  35
  36 /* Map between virtual and physical channel and lun */
  37 struct nvm_ch_map {
  38         int ch_off;
  39         int num_lun;
  40         int *lun_offs;
  41 };
  42
  43 struct nvm_dev_map {
  44         struct nvm_ch_map *chnls;
  45         int num_ch;
  46 };
  47
  48 static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
  49 {
  50         struct nvm_target *tgt;
  51
  52         list_for_each_entry(tgt, &dev->targets, list)
  53                 if (!strcmp(name, tgt->disk->disk_name))
  54                         return tgt;
  55
  56         return NULL;
  57 }
  58
  59 static bool nvm_target_exists(const char *name)
  60 {
  61         struct nvm_dev *dev;
  62         struct nvm_target *tgt;
  63         bool ret = false;
  64
  65         down_write(&nvm_lock);
  66         list_for_each_entry(dev, &nvm_devices, devices) {
  67                 mutex_lock(&dev->mlock);
  68                 list_for_each_entry(tgt, &dev->targets, list) {
  69                         if (!strcmp(name, tgt->disk->disk_name)) {
  70                                 ret = true;
  71                                 mutex_unlock(&dev->mlock);
  72                                 goto out;
  73                         }
  74                 }
  75                 mutex_unlock(&dev->mlock);
  76         }
  77
  78 out:
  79         up_write(&nvm_lock);
  80         return ret;
  81 }
  82
  83 static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
  84 {
  85         int i;
  86
  87         for (i = lun_begin; i <= lun_end; i++) {
  88                 if (test_and_set_bit(i, dev->lun_map)) {
  89                         pr_err("nvm: lun %d already allocated\n", i);
  90                         goto err;
  91                 }
  92         }
  93
  94         return 0;
  95 err:
  96         while (--i >= lun_begin)
  97                 clear_bit(i, dev->lun_map);
  98
  99         return -EBUSY;
 100 }
 101
 102 static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
 103                                  int lun_end)
 104 {
 105         int i;
 106
 107         for (i = lun_begin; i <= lun_end; i++)
 108                 WARN_ON(!test_and_clear_bit(i, dev->lun_map));
 109 }
 110
 111 static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear)
 112 {
 113         struct nvm_dev *dev = tgt_dev->parent;
 114         struct nvm_dev_map *dev_map = tgt_dev->map;
 115         int i, j;
 116
 117         for (i = 0; i < dev_map->num_ch; i++) {
 118                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 119                 int *lun_offs = ch_map->lun_offs;
 120                 int ch = i + ch_map->ch_off;
 121
 122                 if (clear) {
 123                         for (j = 0; j < ch_map->num_lun; j++) {
 124                                 int lun = j + lun_offs[j];
 125                                 int lunid = (ch * dev->geo.num_lun) + lun;
 126
 127                                 WARN_ON(!test_and_clear_bit(lunid,
 128                                                         dev->lun_map));
 129                         }
 130                 }
 131
 132                 kfree(ch_map->lun_offs);
 133         }
 134
 135         kfree(dev_map->chnls);
 136         kfree(dev_map);
 137
 138         kfree(tgt_dev->luns);
 139         kfree(tgt_dev);
 140 }
 141
 142 static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
 143                                               u16 lun_begin, u16 lun_end,
 144                                               u16 op)
 145 {
 146         struct nvm_tgt_dev *tgt_dev = NULL;
 147         struct nvm_dev_map *dev_rmap = dev->rmap;
 148         struct nvm_dev_map *dev_map;
 149         struct ppa_addr *luns;
 150         int num_lun = lun_end - lun_begin + 1;
 151         int luns_left = num_lun;
 152         int num_ch = num_lun / dev->geo.num_lun;
 153         int num_ch_mod = num_lun % dev->geo.num_lun;
 154         int bch = lun_begin / dev->geo.num_lun;
 155         int blun = lun_begin % dev->geo.num_lun;
 156         int lunid = 0;
 157         int lun_balanced = 1;
 158         int sec_per_lun, prev_num_lun;
 159         int i, j;
 160
 161         num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1;
 162
 163         dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 164         if (!dev_map)
 165                 goto err_dev;
 166
 167         dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL);
 168         if (!dev_map->chnls)
 169                 goto err_chnls;
 170
 171         luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL);
 172         if (!luns)
 173                 goto err_luns;
 174
 175         prev_num_lun = (luns_left > dev->geo.num_lun) ?
 176                                         dev->geo.num_lun : luns_left;
 177         for (i = 0; i < num_ch; i++) {
 178                 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
 179                 int *lun_roffs = ch_rmap->lun_offs;
 180                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 181                 int *lun_offs;
 182                 int luns_in_chnl = (luns_left > dev->geo.num_lun) ?
 183                                         dev->geo.num_lun : luns_left;
 184
 185                 if (lun_balanced && prev_num_lun != luns_in_chnl)
 186                         lun_balanced = 0;
 187
 188                 ch_map->ch_off = ch_rmap->ch_off = bch;
 189                 ch_map->num_lun = luns_in_chnl;
 190
 191                 lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 192                 if (!lun_offs)
 193                         goto err_ch;
 194
 195                 for (j = 0; j < luns_in_chnl; j++) {
 196                         luns[lunid].ppa = 0;
 197                         luns[lunid].a.ch = i;
 198                         luns[lunid++].a.lun = j;
 199
 200                         lun_offs[j] = blun;
 201                         lun_roffs[j + blun] = blun;
 202                 }
 203
 204                 ch_map->lun_offs = lun_offs;
 205
 206                 /* when starting a new channel, lun offset is reset */
 207                 blun = 0;
 208                 luns_left -= luns_in_chnl;
 209         }
 210
 211         dev_map->num_ch = num_ch;
 212
 213         tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
 214         if (!tgt_dev)
 215                 goto err_ch;
 216
 217         /* Inherit device geometry from parent */
 218         memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
 219
 220         /* Target device only owns a portion of the physical device */
 221         tgt_dev->geo.num_ch = num_ch;
 222         tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1;
 223         tgt_dev->geo.all_luns = num_lun;
 224         tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk;
 225
 226         tgt_dev->geo.op = op;
 227
 228         sec_per_lun = dev->geo.clba * dev->geo.num_chk;
 229         tgt_dev->geo.total_secs = num_lun * sec_per_lun;
 230
 231         tgt_dev->q = dev->q;
 232         tgt_dev->map = dev_map;
 233         tgt_dev->luns = luns;
 234         tgt_dev->parent = dev;
 235
 236         return tgt_dev;
 237 err_ch:
 238         while (--i >= 0)
 239                 kfree(dev_map->chnls[i].lun_offs);
 240         kfree(luns);
 241 err_luns:
 242         kfree(dev_map->chnls);
 243 err_chnls:
 244         kfree(dev_map);
 245 err_dev:
 246         return tgt_dev;
 247 }
 248
 249 static const struct block_device_operations nvm_fops = {
 250         .owner          = THIS_MODULE,
 251 };
 252
 253 static struct nvm_tgt_type *__nvm_find_target_type(const char *name)
 254 {
 255         struct nvm_tgt_type *tt;
 256
 257         list_for_each_entry(tt, &nvm_tgt_types, list)
 258                 if (!strcmp(name, tt->name))
 259                         return tt;
 260
 261         return NULL;
 262 }
 263
 264 static struct nvm_tgt_type *nvm_find_target_type(const char *name)
 265 {
 266         struct nvm_tgt_type *tt;
 267
 268         down_write(&nvm_tgtt_lock);
 269         tt = __nvm_find_target_type(name);
 270         up_write(&nvm_tgtt_lock);
 271
 272         return tt;
 273 }
 274
 275 static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin,
 276                                  int lun_end)
 277 {
 278         if (lun_begin > lun_end || lun_end >= geo->all_luns) {
 279                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
 280                         lun_begin, lun_end, geo->all_luns - 1);
 281                 return -EINVAL;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int __nvm_config_simple(struct nvm_dev *dev,
 288                                struct nvm_ioctl_create_simple *s)
 289 {
 290         struct nvm_geo *geo = &dev->geo;
 291
 292         if (s->lun_begin == -1 && s->lun_end == -1) {
 293                 s->lun_begin = 0;
 294                 s->lun_end = geo->all_luns - 1;
 295         }
 296
 297         return nvm_config_check_luns(geo, s->lun_begin, s->lun_end);
 298 }
 299
 300 static int __nvm_config_extended(struct nvm_dev *dev,
 301                                  struct nvm_ioctl_create_extended *e)
 302 {
 303         if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) {
 304                 e->lun_begin = 0;
 305                 e->lun_end = dev->geo.all_luns - 1;
 306         }
 307
 308         /* op not set falls into target's default */
 309         if (e->op == 0xFFFF) {
 310                 e->op = NVM_TARGET_DEFAULT_OP;
 311         } else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) {
 312                 pr_err("nvm: invalid over provisioning value\n");
 313                 return -EINVAL;
 314         }
 315
 316         return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end);
 317 }
 318
 319 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 320 {
 321         struct nvm_ioctl_create_extended e;
 322         struct request_queue *tqueue;
 323         struct gendisk *tdisk;
 324         struct nvm_tgt_type *tt;
 325         struct nvm_target *t;
 326         struct nvm_tgt_dev *tgt_dev;
 327         void *targetdata;
 328         int ret;
 329
 330         switch (create->conf.type) {
 331         case NVM_CONFIG_TYPE_SIMPLE:
 332                 ret = __nvm_config_simple(dev, &create->conf.s);
 333                 if (ret)
 334                         return ret;
 335
 336                 e.lun_begin = create->conf.s.lun_begin;
 337                 e.lun_end = create->conf.s.lun_end;
 338                 e.op = NVM_TARGET_DEFAULT_OP;
 339                 break;
 340         case NVM_CONFIG_TYPE_EXTENDED:
 341                 ret = __nvm_config_extended(dev, &create->conf.e);
 342                 if (ret)
 343                         return ret;
 344
 345                 e = create->conf.e;
 346                 break;
 347         default:
 348                 pr_err("nvm: config type not valid\n");
 349                 return -EINVAL;
 350         }
 351
 352         tt = nvm_find_target_type(create->tgttype);
 353         if (!tt) {
 354                 pr_err("nvm: target type %s not found\n", create->tgttype);
 355                 return -EINVAL;
 356         }
 357
 358         if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) {
 359                 pr_err("nvm: device is incompatible with target L2P type.\n");
 360                 return -EINVAL;
 361         }
 362
 363         if (nvm_target_exists(create->tgtname)) {
 364                 pr_err("nvm: target name already exists (%s)\n",
 365                                                         create->tgtname);
 366                 return -EINVAL;
 367         }
 368
 369         ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end);
 370         if (ret)
 371                 return ret;
 372
 373         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 374         if (!t) {
 375                 ret = -ENOMEM;
 376                 goto err_reserve;
 377         }
 378
 379         tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op);
 380         if (!tgt_dev) {
 381                 pr_err("nvm: could not create target device\n");
 382                 ret = -ENOMEM;
 383                 goto err_t;
 384         }
 385
 386         tdisk = alloc_disk(0);
 387         if (!tdisk) {
 388                 ret = -ENOMEM;
 389                 goto err_dev;
 390         }
 391
 392         tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node, NULL);
 393         if (!tqueue) {
 394                 ret = -ENOMEM;
 395                 goto err_disk;
 396         }
 397         blk_queue_make_request(tqueue, tt->make_rq);
 398
 399         strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 400         tdisk->flags = GENHD_FL_EXT_DEVT;
 401         tdisk->major = 0;
 402         tdisk->first_minor = 0;
 403         tdisk->fops = &nvm_fops;
 404         tdisk->queue = tqueue;
 405
 406         targetdata = tt->init(tgt_dev, tdisk, create->flags);
 407         if (IS_ERR(targetdata)) {
 408                 ret = PTR_ERR(targetdata);
 409                 goto err_init;
 410         }
 411
 412         tdisk->private_data = targetdata;
 413         tqueue->queuedata = targetdata;
 414
 415         blk_queue_max_hw_sectors(tqueue,
 416                         (dev->geo.csecs >> 9) * NVM_MAX_VLBA);
 417
 418         set_capacity(tdisk, tt->capacity(targetdata));
 419         add_disk(tdisk);
 420
 421         if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
 422                 ret = -ENOMEM;
 423                 goto err_sysfs;
 424         }
 425
 426         t->type = tt;
 427         t->disk = tdisk;
 428         t->dev = tgt_dev;
 429
 430         mutex_lock(&dev->mlock);
 431         list_add_tail(&t->list, &dev->targets);
 432         mutex_unlock(&dev->mlock);
 433
 434         __module_get(tt->owner);
 435
 436         return 0;
 437 err_sysfs:
 438         if (tt->exit)
 439                 tt->exit(targetdata, true);
 440 err_init:
 441         blk_cleanup_queue(tqueue);
 442         tdisk->queue = NULL;
 443 err_disk:
 444         put_disk(tdisk);
 445 err_dev:
 446         nvm_remove_tgt_dev(tgt_dev, 0);
 447 err_t:
 448         kfree(t);
 449 err_reserve:
 450         nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
 451         return ret;
 452 }
 453
 454 static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 455 {
 456         struct nvm_tgt_type *tt = t->type;
 457         struct gendisk *tdisk = t->disk;
 458         struct request_queue *q = tdisk->queue;
 459
 460         del_gendisk(tdisk);
 461         blk_cleanup_queue(q);
 462
 463         if (tt->sysfs_exit)
 464                 tt->sysfs_exit(tdisk);
 465
 466         if (tt->exit)
 467                 tt->exit(tdisk->private_data, graceful);
 468
 469         nvm_remove_tgt_dev(t->dev, 1);
 470         put_disk(tdisk);
 471         module_put(t->type->owner);
 472
 473         list_del(&t->list);
 474         kfree(t);
 475 }
 476
 477 /**
 478  * nvm_remove_tgt - Removes a target from the media manager
 479  * @dev:        device
 480  * @remove:     ioctl structure with target name to remove.
 481  *
 482  * Returns:
 483  * 0: on success
 484  * 1: on not found
 485  * <0: on error
 486  */
 487 static int nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
 488 {
 489         struct nvm_target *t;
 490
 491         mutex_lock(&dev->mlock);
 492         t = nvm_find_target(dev, remove->tgtname);
 493         if (!t) {
 494                 mutex_unlock(&dev->mlock);
 495                 return 1;
 496         }
 497         __nvm_remove_target(t, true);
 498         mutex_unlock(&dev->mlock);
 499
 500         return 0;
 501 }
 502
 503 static int nvm_register_map(struct nvm_dev *dev)
 504 {
 505         struct nvm_dev_map *rmap;
 506         int i, j;
 507
 508         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 509         if (!rmap)
 510                 goto err_rmap;
 511
 512         rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map),
 513                                                                 GFP_KERNEL);
 514         if (!rmap->chnls)
 515                 goto err_chnls;
 516
 517         for (i = 0; i < dev->geo.num_ch; i++) {
 518                 struct nvm_ch_map *ch_rmap;
 519                 int *lun_roffs;
 520                 int luns_in_chnl = dev->geo.num_lun;
 521
 522                 ch_rmap = &rmap->chnls[i];
 523
 524                 ch_rmap->ch_off = -1;
 525                 ch_rmap->num_lun = luns_in_chnl;
 526
 527                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 528                 if (!lun_roffs)
 529                         goto err_ch;
 530
 531                 for (j = 0; j < luns_in_chnl; j++)
 532                         lun_roffs[j] = -1;
 533
 534                 ch_rmap->lun_offs = lun_roffs;
 535         }
 536
 537         dev->rmap = rmap;
 538
 539         return 0;
 540 err_ch:
 541         while (--i >= 0)
 542                 kfree(rmap->chnls[i].lun_offs);
 543 err_chnls:
 544         kfree(rmap);
 545 err_rmap:
 546         return -ENOMEM;
 547 }
 548
 549 static void nvm_unregister_map(struct nvm_dev *dev)
 550 {
 551         struct nvm_dev_map *rmap = dev->rmap;
 552         int i;
 553
 554         for (i = 0; i < dev->geo.num_ch; i++)
 555                 kfree(rmap->chnls[i].lun_offs);
 556
 557         kfree(rmap->chnls);
 558         kfree(rmap);
 559 }
 560
 561 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 562 {
 563         struct nvm_dev_map *dev_map = tgt_dev->map;
 564         struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch];
 565         int lun_off = ch_map->lun_offs[p->a.lun];
 566
 567         p->a.ch += ch_map->ch_off;
 568         p->a.lun += lun_off;
 569 }
 570
 571 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 572 {
 573         struct nvm_dev *dev = tgt_dev->parent;
 574         struct nvm_dev_map *dev_rmap = dev->rmap;
 575         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch];
 576         int lun_roff = ch_rmap->lun_offs[p->a.lun];
 577
 578         p->a.ch -= ch_rmap->ch_off;
 579         p->a.lun -= lun_roff;
 580 }
 581
 582 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 583                                 struct ppa_addr *ppa_list, int nr_ppas)
 584 {
 585         int i;
 586
 587         for (i = 0; i < nr_ppas; i++) {
 588                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 589                 ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]);
 590         }
 591 }
 592
 593 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 594                                 struct ppa_addr *ppa_list, int nr_ppas)
 595 {
 596         int i;
 597
 598         for (i = 0; i < nr_ppas; i++) {
 599                 ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]);
 600                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 601         }
 602 }
 603
 604 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 605 {
 606         if (rqd->nr_ppas == 1) {
 607                 nvm_ppa_tgt_to_dev(tgt_dev, &rqd->ppa_addr, 1);
 608                 return;
 609         }
 610
 611         nvm_ppa_tgt_to_dev(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 612 }
 613
 614 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 615 {
 616         if (rqd->nr_ppas == 1) {
 617                 nvm_ppa_dev_to_tgt(tgt_dev, &rqd->ppa_addr, 1);
 618                 return;
 619         }
 620
 621         nvm_ppa_dev_to_tgt(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
 622 }
 623
 624 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 625 {
 626         int ret = 0;
 627
 628         down_write(&nvm_tgtt_lock);
 629         if (__nvm_find_target_type(tt->name))
 630                 ret = -EEXIST;
 631         else
 632                 list_add(&tt->list, &nvm_tgt_types);
 633         up_write(&nvm_tgtt_lock);
 634
 635         return ret;
 636 }
 637 EXPORT_SYMBOL(nvm_register_tgt_type);
 638
 639 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 640 {
 641         if (!tt)
 642                 return;
 643
 644         down_write(&nvm_tgtt_lock);
 645         list_del(&tt->list);
 646         up_write(&nvm_tgtt_lock);
 647 }
 648 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 649
 650 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 651                                                         dma_addr_t *dma_handler)
 652 {
 653         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 654                                                                 dma_handler);
 655 }
 656 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 657
 658 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 659 {
 660         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 661 }
 662 EXPORT_SYMBOL(nvm_dev_dma_free);
 663
 664 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 665 {
 666         struct nvm_dev *dev;
 667
 668         list_for_each_entry(dev, &nvm_devices, devices)
 669                 if (!strcmp(name, dev->name))
 670                         return dev;
 671
 672         return NULL;
 673 }
 674
 675 static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 676                         const struct ppa_addr *ppas, int nr_ppas)
 677 {
 678         struct nvm_dev *dev = tgt_dev->parent;
 679         struct nvm_geo *geo = &tgt_dev->geo;
 680         int i, plane_cnt, pl_idx;
 681         struct ppa_addr ppa;
 682
 683         if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
 684                 rqd->nr_ppas = nr_ppas;
 685                 rqd->ppa_addr = ppas[0];
 686
 687                 return 0;
 688         }
 689
 690         rqd->nr_ppas = nr_ppas;
 691         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 692         if (!rqd->ppa_list) {
 693                 pr_err("nvm: failed to allocate dma memory\n");
 694                 return -ENOMEM;
 695         }
 696
 697         plane_cnt = geo->pln_mode;
 698         rqd->nr_ppas *= plane_cnt;
 699
 700         for (i = 0; i < nr_ppas; i++) {
 701                 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 702                         ppa = ppas[i];
 703                         ppa.g.pl = pl_idx;
 704                         rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 705                 }
 706         }
 707
 708         return 0;
 709 }
 710
 711 static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
 712                         struct nvm_rq *rqd)
 713 {
 714         if (!rqd->ppa_list)
 715                 return;
 716
 717         nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
 718 }
 719
 720 static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
 721 {
 722         int flags = 0;
 723
 724         if (geo->version == NVM_OCSSD_SPEC_20)
 725                 return 0;
 726
 727         if (rqd->is_seq)
 728                 flags |= geo->pln_mode >> 1;
 729
 730         if (rqd->opcode == NVM_OP_PREAD)
 731                 flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND);
 732         else if (rqd->opcode == NVM_OP_PWRITE)
 733                 flags |= NVM_IO_SCRAMBLE_ENABLE;
 734
 735         return flags;
 736 }
 737
 738 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 739 {
 740         struct nvm_dev *dev = tgt_dev->parent;
 741         int ret;
 742
 743         if (!dev->ops->submit_io)
 744                 return -ENODEV;
 745
 746         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 747
 748         rqd->dev = tgt_dev;
 749         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 750
 751         /* In case of error, fail with right address format */
 752         ret = dev->ops->submit_io(dev, rqd);
 753         if (ret)
 754                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 755         return ret;
 756 }
 757 EXPORT_SYMBOL(nvm_submit_io);
 758
 759 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 760 {
 761         struct nvm_dev *dev = tgt_dev->parent;
 762         int ret;
 763
 764         if (!dev->ops->submit_io_sync)
 765                 return -ENODEV;
 766
 767         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 768
 769         rqd->dev = tgt_dev;
 770         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 771
 772         /* In case of error, fail with right address format */
 773         ret = dev->ops->submit_io_sync(dev, rqd);
 774         nvm_rq_dev_to_tgt(tgt_dev, rqd);
 775
 776         return ret;
 777 }
 778 EXPORT_SYMBOL(nvm_submit_io_sync);
 779
 780 void nvm_end_io(struct nvm_rq *rqd)
 781 {
 782         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 783
 784         /* Convert address space */
 785         if (tgt_dev)
 786                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 787
 788         if (rqd->end_io)
 789                 rqd->end_io(rqd);
 790 }
 791 EXPORT_SYMBOL(nvm_end_io);
 792
 793 static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
 794 {
 795         if (!dev->ops->submit_io_sync)
 796                 return -ENODEV;
 797
 798         rqd->flags = nvm_set_flags(&dev->geo, rqd);
 799
 800         return dev->ops->submit_io_sync(dev, rqd);
 801 }
 802
 803 static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
 804 {
 805         struct nvm_rq rqd = { NULL };
 806         struct bio bio;
 807         struct bio_vec bio_vec;
 808         struct page *page;
 809         int ret;
 810
 811         page = alloc_page(GFP_KERNEL);
 812         if (!page)
 813                 return -ENOMEM;
 814
 815         bio_init(&bio, &bio_vec, 1);
 816         bio_add_page(&bio, page, PAGE_SIZE, 0);
 817         bio_set_op_attrs(&bio, REQ_OP_READ, 0);
 818
 819         rqd.bio = &bio;
 820         rqd.opcode = NVM_OP_PREAD;
 821         rqd.is_seq = 1;
 822         rqd.nr_ppas = 1;
 823         rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 824
 825         ret = nvm_submit_io_sync_raw(dev, &rqd);
 826         if (ret)
 827                 return ret;
 828
 829         __free_page(page);
 830
 831         return rqd.error;
 832 }
 833
 834 /*
 835  * Scans a 1.2 chunk first and last page to determine if its state.
 836  * If the chunk is found to be open, also scan it to update the write
 837  * pointer.
 838  */
 839 static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
 840                              struct nvm_chk_meta *meta)
 841 {
 842         struct nvm_geo *geo = &dev->geo;
 843         int ret, pg, pl;
 844
 845         /* sense first page */
 846         ret = nvm_bb_chunk_sense(dev, ppa);
 847         if (ret < 0) /* io error */
 848                 return ret;
 849         else if (ret == 0) /* valid data */
 850                 meta->state = NVM_CHK_ST_OPEN;
 851         else if (ret > 0) {
 852                 /*
 853                  * If empty page, the chunk is free, else it is an
 854                  * actual io error. In that case, mark it offline.
 855                  */
 856                 switch (ret) {
 857                 case NVM_RSP_ERR_EMPTYPAGE:
 858                         meta->state = NVM_CHK_ST_FREE;
 859                         return 0;
 860                 case NVM_RSP_ERR_FAILCRC:
 861                 case NVM_RSP_ERR_FAILECC:
 862                 case NVM_RSP_WARN_HIGHECC:
 863                         meta->state = NVM_CHK_ST_OPEN;
 864                         goto scan;
 865                 default:
 866                         return -ret; /* other io error */
 867                 }
 868         }
 869
 870         /* sense last page */
 871         ppa.g.pg = geo->num_pg - 1;
 872         ppa.g.pl = geo->num_pln - 1;
 873
 874         ret = nvm_bb_chunk_sense(dev, ppa);
 875         if (ret < 0) /* io error */
 876                 return ret;
 877         else if (ret == 0) { /* Chunk fully written */
 878                 meta->state = NVM_CHK_ST_CLOSED;
 879                 meta->wp = geo->clba;
 880                 return 0;
 881         } else if (ret > 0) {
 882                 switch (ret) {
 883                 case NVM_RSP_ERR_EMPTYPAGE:
 884                 case NVM_RSP_ERR_FAILCRC:
 885                 case NVM_RSP_ERR_FAILECC:
 886                 case NVM_RSP_WARN_HIGHECC:
 887                         meta->state = NVM_CHK_ST_OPEN;
 888                         break;
 889                 default:
 890                         return -ret; /* other io error */
 891                 }
 892         }
 893
 894 scan:
 895         /*
 896          * chunk is open, we scan sequentially to update the write pointer.
 897          * We make the assumption that targets write data across all planes
 898          * before moving to the next page.
 899          */
 900         for (pg = 0; pg < geo->num_pg; pg++) {
 901                 for (pl = 0; pl < geo->num_pln; pl++) {
 902                         ppa.g.pg = pg;
 903                         ppa.g.pl = pl;
 904
 905                         ret = nvm_bb_chunk_sense(dev, ppa);
 906                         if (ret < 0) /* io error */
 907                                 return ret;
 908                         else if (ret == 0) {
 909                                 meta->wp += geo->ws_min;
 910                         } else if (ret > 0) {
 911                                 switch (ret) {
 912                                 case NVM_RSP_ERR_EMPTYPAGE:
 913                                         return 0;
 914                                 case NVM_RSP_ERR_FAILCRC:
 915                                 case NVM_RSP_ERR_FAILECC:
 916                                 case NVM_RSP_WARN_HIGHECC:
 917                                         meta->wp += geo->ws_min;
 918                                         break;
 919                                 default:
 920                                         return -ret; /* other io error */
 921                                 }
 922                         }
 923                 }
 924         }
 925
 926         return 0;
 927 }
 928
 929 /*
 930  * folds a bad block list from its plane representation to its
 931  * chunk representation.
 932  *
 933  * If any of the planes status are bad or grown bad, the chunk is marked
 934  * offline. If not bad, the first plane state acts as the chunk state.
 935  */
 936 static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
 937                            u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
 938 {
 939         struct nvm_geo *geo = &dev->geo;
 940         int ret, blk, pl, offset, blktype;
 941
 942         for (blk = 0; blk < geo->num_chk; blk++) {
 943                 offset = blk * geo->pln_mode;
 944                 blktype = blks[offset];
 945
 946                 for (pl = 0; pl < geo->pln_mode; pl++) {
 947                         if (blks[offset + pl] &
 948                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 949                                 blktype = blks[offset + pl];
 950                                 break;
 951                         }
 952                 }
 953
 954                 ppa.g.blk = blk;
 955
 956                 meta->wp = 0;
 957                 meta->type = NVM_CHK_TP_W_SEQ;
 958                 meta->wi = 0;
 959                 meta->slba = generic_to_dev_addr(dev, ppa).ppa;
 960                 meta->cnlb = dev->geo.clba;
 961
 962                 if (blktype == NVM_BLK_T_FREE) {
 963                         ret = nvm_bb_chunk_scan(dev, ppa, meta);
 964                         if (ret)
 965                                 return ret;
 966                 } else {
 967                         meta->state = NVM_CHK_ST_OFFLINE;
 968                 }
 969
 970                 meta++;
 971         }
 972
 973         return 0;
 974 }
 975
 976 static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
 977                            int nchks, struct nvm_chk_meta *meta)
 978 {
 979         struct nvm_geo *geo = &dev->geo;
 980         struct ppa_addr ppa;
 981         u8 *blks;
 982         int ch, lun, nr_blks;
 983         int ret;
 984
 985         ppa.ppa = slba;
 986         ppa = dev_to_generic_addr(dev, ppa);
 987
 988         if (ppa.g.blk != 0)
 989                 return -EINVAL;
 990
 991         if ((nchks % geo->num_chk) != 0)
 992                 return -EINVAL;
 993
 994         nr_blks = geo->num_chk * geo->pln_mode;
 995
 996         blks = kmalloc(nr_blks, GFP_KERNEL);
 997         if (!blks)
 998                 return -ENOMEM;
 999
1000         for (ch = ppa.g.ch; ch < geo->num_ch; ch++) {
1001                 for (lun = ppa.g.lun; lun < geo->num_lun; lun++) {
1002                         struct ppa_addr ppa_gen, ppa_dev;
1003
1004                         if (!nchks)
1005                                 goto done;
1006
1007                         ppa_gen.ppa = 0;
1008                         ppa_gen.g.ch = ch;
1009                         ppa_gen.g.lun = lun;
1010                         ppa_dev = generic_to_dev_addr(dev, ppa_gen);
1011
1012                         ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks);
1013                         if (ret)
1014                                 goto done;
1015
1016                         ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks,
1017                                                                         meta);
1018                         if (ret)
1019                                 goto done;
1020
1021                         meta += geo->num_chk;
1022                         nchks -= geo->num_chk;
1023                 }
1024         }
1025 done:
1026         kfree(blks);
1027         return ret;
1028 }
1029
1030 int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
1031                        int nchks, struct nvm_chk_meta *meta)
1032 {
1033         struct nvm_dev *dev = tgt_dev->parent;
1034
1035         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
1036
1037         if (dev->geo.version == NVM_OCSSD_SPEC_12)
1038                 return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1039
1040         return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1041 }
1042 EXPORT_SYMBOL_GPL(nvm_get_chunk_meta);
1043
1044 int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
1045                        int nr_ppas, int type)
1046 {
1047         struct nvm_dev *dev = tgt_dev->parent;
1048         struct nvm_rq rqd;
1049         int ret;
1050
1051         if (dev->geo.version == NVM_OCSSD_SPEC_20)
1052                 return 0;
1053
1054         if (nr_ppas > NVM_MAX_VLBA) {
1055                 pr_err("nvm: unable to update all blocks atomically\n");
1056                 return -EINVAL;
1057         }
1058
1059         memset(&rqd, 0, sizeof(struct nvm_rq));
1060
1061         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
1062         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
1063
1064         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
1065         nvm_free_rqd_ppalist(tgt_dev, &rqd);
1066         if (ret)
1067                 return -EINVAL;
1068
1069         return 0;
1070 }
1071 EXPORT_SYMBOL_GPL(nvm_set_chunk_meta);
1072
1073 static int nvm_core_init(struct nvm_dev *dev)
1074 {
1075         struct nvm_geo *geo = &dev->geo;
1076         int ret;
1077
1078         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
1079                                         sizeof(unsigned long), GFP_KERNEL);
1080         if (!dev->lun_map)
1081                 return -ENOMEM;
1082
1083         INIT_LIST_HEAD(&dev->area_list);
1084         INIT_LIST_HEAD(&dev->targets);
1085         mutex_init(&dev->mlock);
1086         spin_lock_init(&dev->lock);
1087
1088         ret = nvm_register_map(dev);
1089         if (ret)
1090                 goto err_fmtype;
1091
1092         return 0;
1093 err_fmtype:
1094         kfree(dev->lun_map);
1095         return ret;
1096 }
1097
1098 static void nvm_free(struct nvm_dev *dev)
1099 {
1100         if (!dev)
1101                 return;
1102
1103         if (dev->dma_pool)
1104                 dev->ops->destroy_dma_pool(dev->dma_pool);
1105
1106         nvm_unregister_map(dev);
1107         kfree(dev->lun_map);
1108         kfree(dev);
1109 }
1110
1111 static int nvm_init(struct nvm_dev *dev)
1112 {
1113         struct nvm_geo *geo = &dev->geo;
1114         int ret = -EINVAL;
1115
1116         if (dev->ops->identity(dev)) {
1117                 pr_err("nvm: device could not be identified\n");
1118                 goto err;
1119         }
1120
1121         pr_debug("nvm: ver:%u.%u nvm_vendor:%x\n",
1122                                 geo->major_ver_id, geo->minor_ver_id,
1123                                 geo->vmnt);
1124
1125         ret = nvm_core_init(dev);
1126         if (ret) {
1127                 pr_err("nvm: could not initialize core structures.\n");
1128                 goto err;
1129         }
1130
1131         pr_info("nvm: registered %s [%u/%u/%u/%u/%u]\n",
1132                         dev->name, dev->geo.ws_min, dev->geo.ws_opt,
1133                         dev->geo.num_chk, dev->geo.all_luns,
1134                         dev->geo.num_ch);
1135         return 0;
1136 err:
1137         pr_err("nvm: failed to initialize nvm\n");
1138         return ret;
1139 }
1140
1141 struct nvm_dev *nvm_alloc_dev(int node)
1142 {
1143         return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1144 }
1145 EXPORT_SYMBOL(nvm_alloc_dev);
1146
1147 int nvm_register(struct nvm_dev *dev)
1148 {
1149         int ret;
1150
1151         if (!dev->q || !dev->ops)
1152                 return -EINVAL;
1153
1154         dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
1155         if (!dev->dma_pool) {
1156                 pr_err("nvm: could not create dma pool\n");
1157                 return -ENOMEM;
1158         }
1159
1160         ret = nvm_init(dev);
1161         if (ret)
1162                 goto err_init;
1163
1164         /* register device with a supported media manager */
1165         down_write(&nvm_lock);
1166         list_add(&dev->devices, &nvm_devices);
1167         up_write(&nvm_lock);
1168
1169         return 0;
1170 err_init:
1171         dev->ops->destroy_dma_pool(dev->dma_pool);
1172         return ret;
1173 }
1174 EXPORT_SYMBOL(nvm_register);
1175
1176 void nvm_unregister(struct nvm_dev *dev)
1177 {
1178         struct nvm_target *t, *tmp;
1179
1180         mutex_lock(&dev->mlock);
1181         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1182                 if (t->dev->parent != dev)
1183                         continue;
1184                 __nvm_remove_target(t, false);
1185         }
1186         mutex_unlock(&dev->mlock);
1187
1188         down_write(&nvm_lock);
1189         list_del(&dev->devices);
1190         up_write(&nvm_lock);
1191
1192         nvm_free(dev);
1193 }
1194 EXPORT_SYMBOL(nvm_unregister);
1195
1196 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1197 {
1198         struct nvm_dev *dev;
1199
1200         down_write(&nvm_lock);
1201         dev = nvm_find_nvm_dev(create->dev);
1202         up_write(&nvm_lock);
1203
1204         if (!dev) {
1205                 pr_err("nvm: device not found\n");
1206                 return -EINVAL;
1207         }
1208
1209         return nvm_create_tgt(dev, create);
1210 }
1211
1212 static long nvm_ioctl_info(struct file *file, void __user *arg)
1213 {
1214         struct nvm_ioctl_info *info;
1215         struct nvm_tgt_type *tt;
1216         int tgt_iter = 0;
1217
1218         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1219         if (IS_ERR(info))
1220                 return -EFAULT;
1221
1222         info->version[0] = NVM_VERSION_MAJOR;
1223         info->version[1] = NVM_VERSION_MINOR;
1224         info->version[2] = NVM_VERSION_PATCH;
1225
1226         down_write(&nvm_tgtt_lock);
1227         list_for_each_entry(tt, &nvm_tgt_types, list) {
1228                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1229
1230                 tgt->version[0] = tt->version[0];
1231                 tgt->version[1] = tt->version[1];
1232                 tgt->version[2] = tt->version[2];
1233                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1234
1235                 tgt_iter++;
1236         }
1237
1238         info->tgtsize = tgt_iter;
1239         up_write(&nvm_tgtt_lock);
1240
1241         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1242                 kfree(info);
1243                 return -EFAULT;
1244         }
1245
1246         kfree(info);
1247         return 0;
1248 }
1249
1250 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1251 {
1252         struct nvm_ioctl_get_devices *devices;
1253         struct nvm_dev *dev;
1254         int i = 0;
1255
1256         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1257         if (!devices)
1258                 return -ENOMEM;
1259
1260         down_write(&nvm_lock);
1261         list_for_each_entry(dev, &nvm_devices, devices) {
1262                 struct nvm_ioctl_device_info *info = &devices->info[i];
1263
1264                 strlcpy(info->devname, dev->name, sizeof(info->devname));
1265
1266                 /* kept for compatibility */
1267                 info->bmversion[0] = 1;
1268                 info->bmversion[1] = 0;
1269                 info->bmversion[2] = 0;
1270                 strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
1271                 i++;
1272
1273                 if (i > 31) {
1274                         pr_err("nvm: max 31 devices can be reported.\n");
1275                         break;
1276                 }
1277         }
1278         up_write(&nvm_lock);
1279
1280         devices->nr_devices = i;
1281
1282         if (copy_to_user(arg, devices,
1283                          sizeof(struct nvm_ioctl_get_devices))) {
1284                 kfree(devices);
1285                 return -EFAULT;
1286         }
1287
1288         kfree(devices);
1289         return 0;
1290 }
1291
1292 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1293 {
1294         struct nvm_ioctl_create create;
1295
1296         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1297                 return -EFAULT;
1298
1299         if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
1300             create.conf.e.rsv != 0) {
1301                 pr_err("nvm: reserved config field in use\n");
1302                 return -EINVAL;
1303         }
1304
1305         create.dev[DISK_NAME_LEN - 1] = '\0';
1306         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1307         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1308
1309         if (create.flags != 0) {
1310                 __u32 flags = create.flags;
1311
1312                 /* Check for valid flags */
1313                 if (flags & NVM_TARGET_FACTORY)
1314                         flags &= ~NVM_TARGET_FACTORY;
1315
1316                 if (flags) {
1317                         pr_err("nvm: flag not supported\n");
1318                         return -EINVAL;
1319                 }
1320         }
1321
1322         return __nvm_configure_create(&create);
1323 }
1324
1325 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1326 {
1327         struct nvm_ioctl_remove remove;
1328         struct nvm_dev *dev;
1329         int ret = 0;
1330
1331         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1332                 return -EFAULT;
1333
1334         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1335
1336         if (remove.flags != 0) {
1337                 pr_err("nvm: no flags supported\n");
1338                 return -EINVAL;
1339         }
1340
1341         list_for_each_entry(dev, &nvm_devices, devices) {
1342                 ret = nvm_remove_tgt(dev, &remove);
1343                 if (!ret)
1344                         break;
1345         }
1346
1347         return ret;
1348 }
1349
1350 /* kept for compatibility reasons */
1351 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1352 {
1353         struct nvm_ioctl_dev_init init;
1354
1355         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1356                 return -EFAULT;
1357
1358         if (init.flags != 0) {
1359                 pr_err("nvm: no flags supported\n");
1360                 return -EINVAL;
1361         }
1362
1363         return 0;
1364 }
1365
1366 /* Kept for compatibility reasons */
1367 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1368 {
1369         struct nvm_ioctl_dev_factory fact;
1370
1371         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1372                 return -EFAULT;
1373
1374         fact.dev[DISK_NAME_LEN - 1] = '\0';
1375
1376         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1377                 return -EINVAL;
1378
1379         return 0;
1380 }
1381
1382 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1383 {
1384         void __user *argp = (void __user *)arg;
1385
1386         if (!capable(CAP_SYS_ADMIN))
1387                 return -EPERM;
1388
1389         switch (cmd) {
1390         case NVM_INFO:
1391                 return nvm_ioctl_info(file, argp);
1392         case NVM_GET_DEVICES:
1393                 return nvm_ioctl_get_devices(file, argp);
1394         case NVM_DEV_CREATE:
1395                 return nvm_ioctl_dev_create(file, argp);
1396         case NVM_DEV_REMOVE:
1397                 return nvm_ioctl_dev_remove(file, argp);
1398         case NVM_DEV_INIT:
1399                 return nvm_ioctl_dev_init(file, argp);
1400         case NVM_DEV_FACTORY:
1401                 return nvm_ioctl_dev_factory(file, argp);
1402         }
1403         return 0;
1404 }
1405
1406 static const struct file_operations _ctl_fops = {
1407         .open = nonseekable_open,
1408         .unlocked_ioctl = nvm_ctl_ioctl,
1409         .owner = THIS_MODULE,
1410         .llseek  = noop_llseek,
1411 };
1412
1413 static struct miscdevice _nvm_misc = {
1414         .minor          = MISC_DYNAMIC_MINOR,
1415         .name           = "lightnvm",
1416         .nodename       = "lightnvm/control",
1417         .fops           = &_ctl_fops,
1418 };
1419 builtin_misc_device(_nvm_misc);