drivers/lightnvm/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
   4  * Initial release: Matias Bjorling <m@bjorling.me>
   5  */
   6
   7 #define pr_fmt(fmt) "nvm: " fmt
   8
   9 #include <linux/list.h>
  10 #include <linux/types.h>
  11 #include <linux/sem.h>
  12 #include <linux/bitmap.h>
  13 #include <linux/module.h>
  14 #include <linux/moduleparam.h>
  15 #include <linux/miscdevice.h>
  16 #include <linux/lightnvm.h>
  17 #include <linux/sched/sysctl.h>
  18
  19 static LIST_HEAD(nvm_tgt_types);
  20 static DECLARE_RWSEM(nvm_tgtt_lock);
  21 static LIST_HEAD(nvm_devices);
  22 static DECLARE_RWSEM(nvm_lock);
  23
  24 /* Map between virtual and physical channel and lun */
  25 struct nvm_ch_map {
  26         int ch_off;
  27         int num_lun;
  28         int *lun_offs;
  29 };
  30
  31 struct nvm_dev_map {
  32         struct nvm_ch_map *chnls;
  33         int num_ch;
  34 };
  35
  36 static void nvm_free(struct kref *ref);
  37
  38 static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
  39 {
  40         struct nvm_target *tgt;
  41
  42         list_for_each_entry(tgt, &dev->targets, list)
  43                 if (!strcmp(name, tgt->disk->disk_name))
  44                         return tgt;
  45
  46         return NULL;
  47 }
  48
  49 static bool nvm_target_exists(const char *name)
  50 {
  51         struct nvm_dev *dev;
  52         struct nvm_target *tgt;
  53         bool ret = false;
  54
  55         down_write(&nvm_lock);
  56         list_for_each_entry(dev, &nvm_devices, devices) {
  57                 mutex_lock(&dev->mlock);
  58                 list_for_each_entry(tgt, &dev->targets, list) {
  59                         if (!strcmp(name, tgt->disk->disk_name)) {
  60                                 ret = true;
  61                                 mutex_unlock(&dev->mlock);
  62                                 goto out;
  63                         }
  64                 }
  65                 mutex_unlock(&dev->mlock);
  66         }
  67
  68 out:
  69         up_write(&nvm_lock);
  70         return ret;
  71 }
  72
  73 static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
  74 {
  75         int i;
  76
  77         for (i = lun_begin; i <= lun_end; i++) {
  78                 if (test_and_set_bit(i, dev->lun_map)) {
  79                         pr_err("lun %d already allocated\n", i);
  80                         goto err;
  81                 }
  82         }
  83
  84         return 0;
  85 err:
  86         while (--i >= lun_begin)
  87                 clear_bit(i, dev->lun_map);
  88
  89         return -EBUSY;
  90 }
  91
  92 static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
  93                                  int lun_end)
  94 {
  95         int i;
  96
  97         for (i = lun_begin; i <= lun_end; i++)
  98                 WARN_ON(!test_and_clear_bit(i, dev->lun_map));
  99 }
 100
 101 static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear)
 102 {
 103         struct nvm_dev *dev = tgt_dev->parent;
 104         struct nvm_dev_map *dev_map = tgt_dev->map;
 105         int i, j;
 106
 107         for (i = 0; i < dev_map->num_ch; i++) {
 108                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 109                 int *lun_offs = ch_map->lun_offs;
 110                 int ch = i + ch_map->ch_off;
 111
 112                 if (clear) {
 113                         for (j = 0; j < ch_map->num_lun; j++) {
 114                                 int lun = j + lun_offs[j];
 115                                 int lunid = (ch * dev->geo.num_lun) + lun;
 116
 117                                 WARN_ON(!test_and_clear_bit(lunid,
 118                                                         dev->lun_map));
 119                         }
 120                 }
 121
 122                 kfree(ch_map->lun_offs);
 123         }
 124
 125         kfree(dev_map->chnls);
 126         kfree(dev_map);
 127
 128         kfree(tgt_dev->luns);
 129         kfree(tgt_dev);
 130 }
 131
 132 static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
 133                                               u16 lun_begin, u16 lun_end,
 134                                               u16 op)
 135 {
 136         struct nvm_tgt_dev *tgt_dev = NULL;
 137         struct nvm_dev_map *dev_rmap = dev->rmap;
 138         struct nvm_dev_map *dev_map;
 139         struct ppa_addr *luns;
 140         int num_lun = lun_end - lun_begin + 1;
 141         int luns_left = num_lun;
 142         int num_ch = num_lun / dev->geo.num_lun;
 143         int num_ch_mod = num_lun % dev->geo.num_lun;
 144         int bch = lun_begin / dev->geo.num_lun;
 145         int blun = lun_begin % dev->geo.num_lun;
 146         int lunid = 0;
 147         int lun_balanced = 1;
 148         int sec_per_lun, prev_num_lun;
 149         int i, j;
 150
 151         num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1;
 152
 153         dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 154         if (!dev_map)
 155                 goto err_dev;
 156
 157         dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL);
 158         if (!dev_map->chnls)
 159                 goto err_chnls;
 160
 161         luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL);
 162         if (!luns)
 163                 goto err_luns;
 164
 165         prev_num_lun = (luns_left > dev->geo.num_lun) ?
 166                                         dev->geo.num_lun : luns_left;
 167         for (i = 0; i < num_ch; i++) {
 168                 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
 169                 int *lun_roffs = ch_rmap->lun_offs;
 170                 struct nvm_ch_map *ch_map = &dev_map->chnls[i];
 171                 int *lun_offs;
 172                 int luns_in_chnl = (luns_left > dev->geo.num_lun) ?
 173                                         dev->geo.num_lun : luns_left;
 174
 175                 if (lun_balanced && prev_num_lun != luns_in_chnl)
 176                         lun_balanced = 0;
 177
 178                 ch_map->ch_off = ch_rmap->ch_off = bch;
 179                 ch_map->num_lun = luns_in_chnl;
 180
 181                 lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 182                 if (!lun_offs)
 183                         goto err_ch;
 184
 185                 for (j = 0; j < luns_in_chnl; j++) {
 186                         luns[lunid].ppa = 0;
 187                         luns[lunid].a.ch = i;
 188                         luns[lunid++].a.lun = j;
 189
 190                         lun_offs[j] = blun;
 191                         lun_roffs[j + blun] = blun;
 192                 }
 193
 194                 ch_map->lun_offs = lun_offs;
 195
 196                 /* when starting a new channel, lun offset is reset */
 197                 blun = 0;
 198                 luns_left -= luns_in_chnl;
 199         }
 200
 201         dev_map->num_ch = num_ch;
 202
 203         tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
 204         if (!tgt_dev)
 205                 goto err_ch;
 206
 207         /* Inherit device geometry from parent */
 208         memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
 209
 210         /* Target device only owns a portion of the physical device */
 211         tgt_dev->geo.num_ch = num_ch;
 212         tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1;
 213         tgt_dev->geo.all_luns = num_lun;
 214         tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk;
 215
 216         tgt_dev->geo.op = op;
 217
 218         sec_per_lun = dev->geo.clba * dev->geo.num_chk;
 219         tgt_dev->geo.total_secs = num_lun * sec_per_lun;
 220
 221         tgt_dev->q = dev->q;
 222         tgt_dev->map = dev_map;
 223         tgt_dev->luns = luns;
 224         tgt_dev->parent = dev;
 225
 226         return tgt_dev;
 227 err_ch:
 228         while (--i >= 0)
 229                 kfree(dev_map->chnls[i].lun_offs);
 230         kfree(luns);
 231 err_luns:
 232         kfree(dev_map->chnls);
 233 err_chnls:
 234         kfree(dev_map);
 235 err_dev:
 236         return tgt_dev;
 237 }
 238
 239 static struct nvm_tgt_type *__nvm_find_target_type(const char *name)
 240 {
 241         struct nvm_tgt_type *tt;
 242
 243         list_for_each_entry(tt, &nvm_tgt_types, list)
 244                 if (!strcmp(name, tt->name))
 245                         return tt;
 246
 247         return NULL;
 248 }
 249
 250 static struct nvm_tgt_type *nvm_find_target_type(const char *name)
 251 {
 252         struct nvm_tgt_type *tt;
 253
 254         down_write(&nvm_tgtt_lock);
 255         tt = __nvm_find_target_type(name);
 256         up_write(&nvm_tgtt_lock);
 257
 258         return tt;
 259 }
 260
 261 static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin,
 262                                  int lun_end)
 263 {
 264         if (lun_begin > lun_end || lun_end >= geo->all_luns) {
 265                 pr_err("lun out of bound (%u:%u > %u)\n",
 266                         lun_begin, lun_end, geo->all_luns - 1);
 267                 return -EINVAL;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int __nvm_config_simple(struct nvm_dev *dev,
 274                                struct nvm_ioctl_create_simple *s)
 275 {
 276         struct nvm_geo *geo = &dev->geo;
 277
 278         if (s->lun_begin == -1 && s->lun_end == -1) {
 279                 s->lun_begin = 0;
 280                 s->lun_end = geo->all_luns - 1;
 281         }
 282
 283         return nvm_config_check_luns(geo, s->lun_begin, s->lun_end);
 284 }
 285
 286 static int __nvm_config_extended(struct nvm_dev *dev,
 287                                  struct nvm_ioctl_create_extended *e)
 288 {
 289         if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) {
 290                 e->lun_begin = 0;
 291                 e->lun_end = dev->geo.all_luns - 1;
 292         }
 293
 294         /* op not set falls into target's default */
 295         if (e->op == 0xFFFF) {
 296                 e->op = NVM_TARGET_DEFAULT_OP;
 297         } else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) {
 298                 pr_err("invalid over provisioning value\n");
 299                 return -EINVAL;
 300         }
 301
 302         return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end);
 303 }
 304
 305 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 306 {
 307         struct nvm_ioctl_create_extended e;
 308         struct gendisk *tdisk;
 309         struct nvm_tgt_type *tt;
 310         struct nvm_target *t;
 311         struct nvm_tgt_dev *tgt_dev;
 312         void *targetdata;
 313         unsigned int mdts;
 314         int ret;
 315
 316         switch (create->conf.type) {
 317         case NVM_CONFIG_TYPE_SIMPLE:
 318                 ret = __nvm_config_simple(dev, &create->conf.s);
 319                 if (ret)
 320                         return ret;
 321
 322                 e.lun_begin = create->conf.s.lun_begin;
 323                 e.lun_end = create->conf.s.lun_end;
 324                 e.op = NVM_TARGET_DEFAULT_OP;
 325                 break;
 326         case NVM_CONFIG_TYPE_EXTENDED:
 327                 ret = __nvm_config_extended(dev, &create->conf.e);
 328                 if (ret)
 329                         return ret;
 330
 331                 e = create->conf.e;
 332                 break;
 333         default:
 334                 pr_err("config type not valid\n");
 335                 return -EINVAL;
 336         }
 337
 338         tt = nvm_find_target_type(create->tgttype);
 339         if (!tt) {
 340                 pr_err("target type %s not found\n", create->tgttype);
 341                 return -EINVAL;
 342         }
 343
 344         if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) {
 345                 pr_err("device is incompatible with target L2P type.\n");
 346                 return -EINVAL;
 347         }
 348
 349         if (nvm_target_exists(create->tgtname)) {
 350                 pr_err("target name already exists (%s)\n",
 351                                                         create->tgtname);
 352                 return -EINVAL;
 353         }
 354
 355         ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end);
 356         if (ret)
 357                 return ret;
 358
 359         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 360         if (!t) {
 361                 ret = -ENOMEM;
 362                 goto err_reserve;
 363         }
 364
 365         tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op);
 366         if (!tgt_dev) {
 367                 pr_err("could not create target device\n");
 368                 ret = -ENOMEM;
 369                 goto err_t;
 370         }
 371
 372         tdisk = blk_alloc_disk(dev->q->node);
 373         if (!tdisk) {
 374                 ret = -ENOMEM;
 375                 goto err_dev;
 376         }
 377
 378         strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 379         tdisk->major = 0;
 380         tdisk->first_minor = 0;
 381         tdisk->fops = tt->bops;
 382
 383         targetdata = tt->init(tgt_dev, tdisk, create->flags);
 384         if (IS_ERR(targetdata)) {
 385                 ret = PTR_ERR(targetdata);
 386                 goto err_init;
 387         }
 388
 389         tdisk->private_data = targetdata;
 390         tdisk->queue->queuedata = targetdata;
 391
 392         mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
 393         if (dev->geo.mdts) {
 394                 mdts = min_t(u32, dev->geo.mdts,
 395                                 (dev->geo.csecs >> 9) * NVM_MAX_VLBA);
 396         }
 397         blk_queue_max_hw_sectors(tdisk->queue, mdts);
 398
 399         set_capacity(tdisk, tt->capacity(targetdata));
 400         add_disk(tdisk);
 401
 402         if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
 403                 ret = -ENOMEM;
 404                 goto err_sysfs;
 405         }
 406
 407         t->type = tt;
 408         t->disk = tdisk;
 409         t->dev = tgt_dev;
 410
 411         mutex_lock(&dev->mlock);
 412         list_add_tail(&t->list, &dev->targets);
 413         mutex_unlock(&dev->mlock);
 414
 415         __module_get(tt->owner);
 416
 417         return 0;
 418 err_sysfs:
 419         if (tt->exit)
 420                 tt->exit(targetdata, true);
 421 err_init:
 422         blk_cleanup_disk(tdisk);
 423 err_dev:
 424         nvm_remove_tgt_dev(tgt_dev, 0);
 425 err_t:
 426         kfree(t);
 427 err_reserve:
 428         nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
 429         return ret;
 430 }
 431
 432 static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 433 {
 434         struct nvm_tgt_type *tt = t->type;
 435         struct gendisk *tdisk = t->disk;
 436
 437         del_gendisk(tdisk);
 438
 439         if (tt->sysfs_exit)
 440                 tt->sysfs_exit(tdisk);
 441
 442         if (tt->exit)
 443                 tt->exit(tdisk->private_data, graceful);
 444
 445         nvm_remove_tgt_dev(t->dev, 1);
 446         blk_cleanup_disk(tdisk);
 447         module_put(t->type->owner);
 448
 449         list_del(&t->list);
 450         kfree(t);
 451 }
 452
 453 /**
 454  * nvm_remove_tgt - Removes a target from the media manager
 455  * @remove:     ioctl structure with target name to remove.
 456  *
 457  * Returns:
 458  * 0: on success
 459  * 1: on not found
 460  * <0: on error
 461  */
 462 static int nvm_remove_tgt(struct nvm_ioctl_remove *remove)
 463 {
 464         struct nvm_target *t = NULL;
 465         struct nvm_dev *dev;
 466
 467         down_read(&nvm_lock);
 468         list_for_each_entry(dev, &nvm_devices, devices) {
 469                 mutex_lock(&dev->mlock);
 470                 t = nvm_find_target(dev, remove->tgtname);
 471                 if (t) {
 472                         mutex_unlock(&dev->mlock);
 473                         break;
 474                 }
 475                 mutex_unlock(&dev->mlock);
 476         }
 477         up_read(&nvm_lock);
 478
 479         if (!t) {
 480                 pr_err("failed to remove target %s\n",
 481                                 remove->tgtname);
 482                 return 1;
 483         }
 484
 485         __nvm_remove_target(t, true);
 486         kref_put(&dev->ref, nvm_free);
 487
 488         return 0;
 489 }
 490
 491 static int nvm_register_map(struct nvm_dev *dev)
 492 {
 493         struct nvm_dev_map *rmap;
 494         int i, j;
 495
 496         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 497         if (!rmap)
 498                 goto err_rmap;
 499
 500         rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map),
 501                                                                 GFP_KERNEL);
 502         if (!rmap->chnls)
 503                 goto err_chnls;
 504
 505         for (i = 0; i < dev->geo.num_ch; i++) {
 506                 struct nvm_ch_map *ch_rmap;
 507                 int *lun_roffs;
 508                 int luns_in_chnl = dev->geo.num_lun;
 509
 510                 ch_rmap = &rmap->chnls[i];
 511
 512                 ch_rmap->ch_off = -1;
 513                 ch_rmap->num_lun = luns_in_chnl;
 514
 515                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 516                 if (!lun_roffs)
 517                         goto err_ch;
 518
 519                 for (j = 0; j < luns_in_chnl; j++)
 520                         lun_roffs[j] = -1;
 521
 522                 ch_rmap->lun_offs = lun_roffs;
 523         }
 524
 525         dev->rmap = rmap;
 526
 527         return 0;
 528 err_ch:
 529         while (--i >= 0)
 530                 kfree(rmap->chnls[i].lun_offs);
 531 err_chnls:
 532         kfree(rmap);
 533 err_rmap:
 534         return -ENOMEM;
 535 }
 536
 537 static void nvm_unregister_map(struct nvm_dev *dev)
 538 {
 539         struct nvm_dev_map *rmap = dev->rmap;
 540         int i;
 541
 542         for (i = 0; i < dev->geo.num_ch; i++)
 543                 kfree(rmap->chnls[i].lun_offs);
 544
 545         kfree(rmap->chnls);
 546         kfree(rmap);
 547 }
 548
 549 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 550 {
 551         struct nvm_dev_map *dev_map = tgt_dev->map;
 552         struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch];
 553         int lun_off = ch_map->lun_offs[p->a.lun];
 554
 555         p->a.ch += ch_map->ch_off;
 556         p->a.lun += lun_off;
 557 }
 558
 559 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 560 {
 561         struct nvm_dev *dev = tgt_dev->parent;
 562         struct nvm_dev_map *dev_rmap = dev->rmap;
 563         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch];
 564         int lun_roff = ch_rmap->lun_offs[p->a.lun];
 565
 566         p->a.ch -= ch_rmap->ch_off;
 567         p->a.lun -= lun_roff;
 568 }
 569
 570 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 571                                 struct ppa_addr *ppa_list, int nr_ppas)
 572 {
 573         int i;
 574
 575         for (i = 0; i < nr_ppas; i++) {
 576                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 577                 ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]);
 578         }
 579 }
 580
 581 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 582                                 struct ppa_addr *ppa_list, int nr_ppas)
 583 {
 584         int i;
 585
 586         for (i = 0; i < nr_ppas; i++) {
 587                 ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]);
 588                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 589         }
 590 }
 591
 592 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 593 {
 594         struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
 595
 596         nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas);
 597 }
 598
 599 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 600 {
 601         struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
 602
 603         nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas);
 604 }
 605
 606 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 607 {
 608         int ret = 0;
 609
 610         down_write(&nvm_tgtt_lock);
 611         if (__nvm_find_target_type(tt->name))
 612                 ret = -EEXIST;
 613         else
 614                 list_add(&tt->list, &nvm_tgt_types);
 615         up_write(&nvm_tgtt_lock);
 616
 617         return ret;
 618 }
 619 EXPORT_SYMBOL(nvm_register_tgt_type);
 620
 621 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 622 {
 623         if (!tt)
 624                 return;
 625
 626         down_write(&nvm_tgtt_lock);
 627         list_del(&tt->list);
 628         up_write(&nvm_tgtt_lock);
 629 }
 630 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 631
 632 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 633                                                         dma_addr_t *dma_handler)
 634 {
 635         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 636                                                                 dma_handler);
 637 }
 638 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 639
 640 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 641 {
 642         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 643 }
 644 EXPORT_SYMBOL(nvm_dev_dma_free);
 645
 646 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 647 {
 648         struct nvm_dev *dev;
 649
 650         list_for_each_entry(dev, &nvm_devices, devices)
 651                 if (!strcmp(name, dev->name))
 652                         return dev;
 653
 654         return NULL;
 655 }
 656
 657 static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 658                         const struct ppa_addr *ppas, int nr_ppas)
 659 {
 660         struct nvm_dev *dev = tgt_dev->parent;
 661         struct nvm_geo *geo = &tgt_dev->geo;
 662         int i, plane_cnt, pl_idx;
 663         struct ppa_addr ppa;
 664
 665         if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
 666                 rqd->nr_ppas = nr_ppas;
 667                 rqd->ppa_addr = ppas[0];
 668
 669                 return 0;
 670         }
 671
 672         rqd->nr_ppas = nr_ppas;
 673         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 674         if (!rqd->ppa_list) {
 675                 pr_err("failed to allocate dma memory\n");
 676                 return -ENOMEM;
 677         }
 678
 679         plane_cnt = geo->pln_mode;
 680         rqd->nr_ppas *= plane_cnt;
 681
 682         for (i = 0; i < nr_ppas; i++) {
 683                 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 684                         ppa = ppas[i];
 685                         ppa.g.pl = pl_idx;
 686                         rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 687                 }
 688         }
 689
 690         return 0;
 691 }
 692
 693 static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
 694                         struct nvm_rq *rqd)
 695 {
 696         if (!rqd->ppa_list)
 697                 return;
 698
 699         nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
 700 }
 701
 702 static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
 703 {
 704         int flags = 0;
 705
 706         if (geo->version == NVM_OCSSD_SPEC_20)
 707                 return 0;
 708
 709         if (rqd->is_seq)
 710                 flags |= geo->pln_mode >> 1;
 711
 712         if (rqd->opcode == NVM_OP_PREAD)
 713                 flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND);
 714         else if (rqd->opcode == NVM_OP_PWRITE)
 715                 flags |= NVM_IO_SCRAMBLE_ENABLE;
 716
 717         return flags;
 718 }
 719
 720 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf)
 721 {
 722         struct nvm_dev *dev = tgt_dev->parent;
 723         int ret;
 724
 725         if (!dev->ops->submit_io)
 726                 return -ENODEV;
 727
 728         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 729
 730         rqd->dev = tgt_dev;
 731         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 732
 733         /* In case of error, fail with right address format */
 734         ret = dev->ops->submit_io(dev, rqd, buf);
 735         if (ret)
 736                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 737         return ret;
 738 }
 739 EXPORT_SYMBOL(nvm_submit_io);
 740
 741 static void nvm_sync_end_io(struct nvm_rq *rqd)
 742 {
 743         struct completion *waiting = rqd->private;
 744
 745         complete(waiting);
 746 }
 747
 748 static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
 749                               void *buf)
 750 {
 751         DECLARE_COMPLETION_ONSTACK(wait);
 752         int ret = 0;
 753
 754         rqd->end_io = nvm_sync_end_io;
 755         rqd->private = &wait;
 756
 757         ret = dev->ops->submit_io(dev, rqd, buf);
 758         if (ret)
 759                 return ret;
 760
 761         wait_for_completion_io(&wait);
 762
 763         return 0;
 764 }
 765
 766 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 767                        void *buf)
 768 {
 769         struct nvm_dev *dev = tgt_dev->parent;
 770         int ret;
 771
 772         if (!dev->ops->submit_io)
 773                 return -ENODEV;
 774
 775         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 776
 777         rqd->dev = tgt_dev;
 778         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 779
 780         ret = nvm_submit_io_wait(dev, rqd, buf);
 781
 782         return ret;
 783 }
 784 EXPORT_SYMBOL(nvm_submit_io_sync);
 785
 786 void nvm_end_io(struct nvm_rq *rqd)
 787 {
 788         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 789
 790         /* Convert address space */
 791         if (tgt_dev)
 792                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 793
 794         if (rqd->end_io)
 795                 rqd->end_io(rqd);
 796 }
 797 EXPORT_SYMBOL(nvm_end_io);
 798
 799 static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
 800 {
 801         if (!dev->ops->submit_io)
 802                 return -ENODEV;
 803
 804         rqd->dev = NULL;
 805         rqd->flags = nvm_set_flags(&dev->geo, rqd);
 806
 807         return nvm_submit_io_wait(dev, rqd, NULL);
 808 }
 809
 810 static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
 811 {
 812         struct nvm_rq rqd = { NULL };
 813         struct bio bio;
 814         struct bio_vec bio_vec;
 815         struct page *page;
 816         int ret;
 817
 818         page = alloc_page(GFP_KERNEL);
 819         if (!page)
 820                 return -ENOMEM;
 821
 822         bio_init(&bio, &bio_vec, 1);
 823         bio_add_page(&bio, page, PAGE_SIZE, 0);
 824         bio_set_op_attrs(&bio, REQ_OP_READ, 0);
 825
 826         rqd.bio = &bio;
 827         rqd.opcode = NVM_OP_PREAD;
 828         rqd.is_seq = 1;
 829         rqd.nr_ppas = 1;
 830         rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 831
 832         ret = nvm_submit_io_sync_raw(dev, &rqd);
 833         __free_page(page);
 834         if (ret)
 835                 return ret;
 836
 837         return rqd.error;
 838 }
 839
 840 /*
 841  * Scans a 1.2 chunk first and last page to determine if its state.
 842  * If the chunk is found to be open, also scan it to update the write
 843  * pointer.
 844  */
 845 static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
 846                              struct nvm_chk_meta *meta)
 847 {
 848         struct nvm_geo *geo = &dev->geo;
 849         int ret, pg, pl;
 850
 851         /* sense first page */
 852         ret = nvm_bb_chunk_sense(dev, ppa);
 853         if (ret < 0) /* io error */
 854                 return ret;
 855         else if (ret == 0) /* valid data */
 856                 meta->state = NVM_CHK_ST_OPEN;
 857         else if (ret > 0) {
 858                 /*
 859                  * If empty page, the chunk is free, else it is an
 860                  * actual io error. In that case, mark it offline.
 861                  */
 862                 switch (ret) {
 863                 case NVM_RSP_ERR_EMPTYPAGE:
 864                         meta->state = NVM_CHK_ST_FREE;
 865                         return 0;
 866                 case NVM_RSP_ERR_FAILCRC:
 867                 case NVM_RSP_ERR_FAILECC:
 868                 case NVM_RSP_WARN_HIGHECC:
 869                         meta->state = NVM_CHK_ST_OPEN;
 870                         goto scan;
 871                 default:
 872                         return -ret; /* other io error */
 873                 }
 874         }
 875
 876         /* sense last page */
 877         ppa.g.pg = geo->num_pg - 1;
 878         ppa.g.pl = geo->num_pln - 1;
 879
 880         ret = nvm_bb_chunk_sense(dev, ppa);
 881         if (ret < 0) /* io error */
 882                 return ret;
 883         else if (ret == 0) { /* Chunk fully written */
 884                 meta->state = NVM_CHK_ST_CLOSED;
 885                 meta->wp = geo->clba;
 886                 return 0;
 887         } else if (ret > 0) {
 888                 switch (ret) {
 889                 case NVM_RSP_ERR_EMPTYPAGE:
 890                 case NVM_RSP_ERR_FAILCRC:
 891                 case NVM_RSP_ERR_FAILECC:
 892                 case NVM_RSP_WARN_HIGHECC:
 893                         meta->state = NVM_CHK_ST_OPEN;
 894                         break;
 895                 default:
 896                         return -ret; /* other io error */
 897                 }
 898         }
 899
 900 scan:
 901         /*
 902          * chunk is open, we scan sequentially to update the write pointer.
 903          * We make the assumption that targets write data across all planes
 904          * before moving to the next page.
 905          */
 906         for (pg = 0; pg < geo->num_pg; pg++) {
 907                 for (pl = 0; pl < geo->num_pln; pl++) {
 908                         ppa.g.pg = pg;
 909                         ppa.g.pl = pl;
 910
 911                         ret = nvm_bb_chunk_sense(dev, ppa);
 912                         if (ret < 0) /* io error */
 913                                 return ret;
 914                         else if (ret == 0) {
 915                                 meta->wp += geo->ws_min;
 916                         } else if (ret > 0) {
 917                                 switch (ret) {
 918                                 case NVM_RSP_ERR_EMPTYPAGE:
 919                                         return 0;
 920                                 case NVM_RSP_ERR_FAILCRC:
 921                                 case NVM_RSP_ERR_FAILECC:
 922                                 case NVM_RSP_WARN_HIGHECC:
 923                                         meta->wp += geo->ws_min;
 924                                         break;
 925                                 default:
 926                                         return -ret; /* other io error */
 927                                 }
 928                         }
 929                 }
 930         }
 931
 932         return 0;
 933 }
 934
 935 /*
 936  * folds a bad block list from its plane representation to its
 937  * chunk representation.
 938  *
 939  * If any of the planes status are bad or grown bad, the chunk is marked
 940  * offline. If not bad, the first plane state acts as the chunk state.
 941  */
 942 static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
 943                            u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
 944 {
 945         struct nvm_geo *geo = &dev->geo;
 946         int ret, blk, pl, offset, blktype;
 947
 948         for (blk = 0; blk < geo->num_chk; blk++) {
 949                 offset = blk * geo->pln_mode;
 950                 blktype = blks[offset];
 951
 952                 for (pl = 0; pl < geo->pln_mode; pl++) {
 953                         if (blks[offset + pl] &
 954                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 955                                 blktype = blks[offset + pl];
 956                                 break;
 957                         }
 958                 }
 959
 960                 ppa.g.blk = blk;
 961
 962                 meta->wp = 0;
 963                 meta->type = NVM_CHK_TP_W_SEQ;
 964                 meta->wi = 0;
 965                 meta->slba = generic_to_dev_addr(dev, ppa).ppa;
 966                 meta->cnlb = dev->geo.clba;
 967
 968                 if (blktype == NVM_BLK_T_FREE) {
 969                         ret = nvm_bb_chunk_scan(dev, ppa, meta);
 970                         if (ret)
 971                                 return ret;
 972                 } else {
 973                         meta->state = NVM_CHK_ST_OFFLINE;
 974                 }
 975
 976                 meta++;
 977         }
 978
 979         return 0;
 980 }
 981
 982 static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
 983                            int nchks, struct nvm_chk_meta *meta)
 984 {
 985         struct nvm_geo *geo = &dev->geo;
 986         struct ppa_addr ppa;
 987         u8 *blks;
 988         int ch, lun, nr_blks;
 989         int ret = 0;
 990
 991         ppa.ppa = slba;
 992         ppa = dev_to_generic_addr(dev, ppa);
 993
 994         if (ppa.g.blk != 0)
 995                 return -EINVAL;
 996
 997         if ((nchks % geo->num_chk) != 0)
 998                 return -EINVAL;
 999
1000         nr_blks = geo->num_chk * geo->pln_mode;
1001
1002         blks = kmalloc(nr_blks, GFP_KERNEL);
1003         if (!blks)
1004                 return -ENOMEM;
1005
1006         for (ch = ppa.g.ch; ch < geo->num_ch; ch++) {
1007                 for (lun = ppa.g.lun; lun < geo->num_lun; lun++) {
1008                         struct ppa_addr ppa_gen, ppa_dev;
1009
1010                         if (!nchks)
1011                                 goto done;
1012
1013                         ppa_gen.ppa = 0;
1014                         ppa_gen.g.ch = ch;
1015                         ppa_gen.g.lun = lun;
1016                         ppa_dev = generic_to_dev_addr(dev, ppa_gen);
1017
1018                         ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks);
1019                         if (ret)
1020                                 goto done;
1021
1022                         ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks,
1023                                                                         meta);
1024                         if (ret)
1025                                 goto done;
1026
1027                         meta += geo->num_chk;
1028                         nchks -= geo->num_chk;
1029                 }
1030         }
1031 done:
1032         kfree(blks);
1033         return ret;
1034 }
1035
1036 int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
1037                        int nchks, struct nvm_chk_meta *meta)
1038 {
1039         struct nvm_dev *dev = tgt_dev->parent;
1040
1041         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
1042
1043         if (dev->geo.version == NVM_OCSSD_SPEC_12)
1044                 return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1045
1046         return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1047 }
1048 EXPORT_SYMBOL_GPL(nvm_get_chunk_meta);
1049
1050 int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
1051                        int nr_ppas, int type)
1052 {
1053         struct nvm_dev *dev = tgt_dev->parent;
1054         struct nvm_rq rqd;
1055         int ret;
1056
1057         if (dev->geo.version == NVM_OCSSD_SPEC_20)
1058                 return 0;
1059
1060         if (nr_ppas > NVM_MAX_VLBA) {
1061                 pr_err("unable to update all blocks atomically\n");
1062                 return -EINVAL;
1063         }
1064
1065         memset(&rqd, 0, sizeof(struct nvm_rq));
1066
1067         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
1068         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
1069
1070         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
1071         nvm_free_rqd_ppalist(tgt_dev, &rqd);
1072         if (ret)
1073                 return -EINVAL;
1074
1075         return 0;
1076 }
1077 EXPORT_SYMBOL_GPL(nvm_set_chunk_meta);
1078
1079 static int nvm_core_init(struct nvm_dev *dev)
1080 {
1081         struct nvm_geo *geo = &dev->geo;
1082         int ret;
1083
1084         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
1085                                         sizeof(unsigned long), GFP_KERNEL);
1086         if (!dev->lun_map)
1087                 return -ENOMEM;
1088
1089         INIT_LIST_HEAD(&dev->area_list);
1090         INIT_LIST_HEAD(&dev->targets);
1091         mutex_init(&dev->mlock);
1092         spin_lock_init(&dev->lock);
1093
1094         ret = nvm_register_map(dev);
1095         if (ret)
1096                 goto err_fmtype;
1097
1098         return 0;
1099 err_fmtype:
1100         kfree(dev->lun_map);
1101         return ret;
1102 }
1103
1104 static void nvm_free(struct kref *ref)
1105 {
1106         struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref);
1107
1108         if (dev->dma_pool)
1109                 dev->ops->destroy_dma_pool(dev->dma_pool);
1110
1111         if (dev->rmap)
1112                 nvm_unregister_map(dev);
1113
1114         kfree(dev->lun_map);
1115         kfree(dev);
1116 }
1117
1118 static int nvm_init(struct nvm_dev *dev)
1119 {
1120         struct nvm_geo *geo = &dev->geo;
1121         int ret = -EINVAL;
1122
1123         if (dev->ops->identity(dev)) {
1124                 pr_err("device could not be identified\n");
1125                 goto err;
1126         }
1127
1128         pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id,
1129                         geo->minor_ver_id, geo->vmnt);
1130
1131         ret = nvm_core_init(dev);
1132         if (ret) {
1133                 pr_err("could not initialize core structures.\n");
1134                 goto err;
1135         }
1136
1137         pr_info("registered %s [%u/%u/%u/%u/%u]\n",
1138                         dev->name, dev->geo.ws_min, dev->geo.ws_opt,
1139                         dev->geo.num_chk, dev->geo.all_luns,
1140                         dev->geo.num_ch);
1141         return 0;
1142 err:
1143         pr_err("failed to initialize nvm\n");
1144         return ret;
1145 }
1146
1147 struct nvm_dev *nvm_alloc_dev(int node)
1148 {
1149         struct nvm_dev *dev;
1150
1151         dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1152         if (dev)
1153                 kref_init(&dev->ref);
1154
1155         return dev;
1156 }
1157 EXPORT_SYMBOL(nvm_alloc_dev);
1158
1159 int nvm_register(struct nvm_dev *dev)
1160 {
1161         int ret, exp_pool_size;
1162
1163         pr_warn_once("lightnvm support is deprecated and will be removed in Linux 5.15.\n");
1164
1165         if (!dev->q || !dev->ops) {
1166                 kref_put(&dev->ref, nvm_free);
1167                 return -EINVAL;
1168         }
1169
1170         ret = nvm_init(dev);
1171         if (ret) {
1172                 kref_put(&dev->ref, nvm_free);
1173                 return ret;
1174         }
1175
1176         exp_pool_size = max_t(int, PAGE_SIZE,
1177                               (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
1178         exp_pool_size = round_up(exp_pool_size, PAGE_SIZE);
1179
1180         dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist",
1181                                                   exp_pool_size);
1182         if (!dev->dma_pool) {
1183                 pr_err("could not create dma pool\n");
1184                 kref_put(&dev->ref, nvm_free);
1185                 return -ENOMEM;
1186         }
1187
1188         /* register device with a supported media manager */
1189         down_write(&nvm_lock);
1190         list_add(&dev->devices, &nvm_devices);
1191         up_write(&nvm_lock);
1192
1193         return 0;
1194 }
1195 EXPORT_SYMBOL(nvm_register);
1196
1197 void nvm_unregister(struct nvm_dev *dev)
1198 {
1199         struct nvm_target *t, *tmp;
1200
1201         mutex_lock(&dev->mlock);
1202         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1203                 if (t->dev->parent != dev)
1204                         continue;
1205                 __nvm_remove_target(t, false);
1206                 kref_put(&dev->ref, nvm_free);
1207         }
1208         mutex_unlock(&dev->mlock);
1209
1210         down_write(&nvm_lock);
1211         list_del(&dev->devices);
1212         up_write(&nvm_lock);
1213
1214         kref_put(&dev->ref, nvm_free);
1215 }
1216 EXPORT_SYMBOL(nvm_unregister);
1217
1218 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1219 {
1220         struct nvm_dev *dev;
1221         int ret;
1222
1223         down_write(&nvm_lock);
1224         dev = nvm_find_nvm_dev(create->dev);
1225         up_write(&nvm_lock);
1226
1227         if (!dev) {
1228                 pr_err("device not found\n");
1229                 return -EINVAL;
1230         }
1231
1232         kref_get(&dev->ref);
1233         ret = nvm_create_tgt(dev, create);
1234         if (ret)
1235                 kref_put(&dev->ref, nvm_free);
1236
1237         return ret;
1238 }
1239
1240 static long nvm_ioctl_info(struct file *file, void __user *arg)
1241 {
1242         struct nvm_ioctl_info *info;
1243         struct nvm_tgt_type *tt;
1244         int tgt_iter = 0;
1245
1246         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1247         if (IS_ERR(info))
1248                 return PTR_ERR(info);
1249
1250         info->version[0] = NVM_VERSION_MAJOR;
1251         info->version[1] = NVM_VERSION_MINOR;
1252         info->version[2] = NVM_VERSION_PATCH;
1253
1254         down_write(&nvm_tgtt_lock);
1255         list_for_each_entry(tt, &nvm_tgt_types, list) {
1256                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1257
1258                 tgt->version[0] = tt->version[0];
1259                 tgt->version[1] = tt->version[1];
1260                 tgt->version[2] = tt->version[2];
1261                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1262
1263                 tgt_iter++;
1264         }
1265
1266         info->tgtsize = tgt_iter;
1267         up_write(&nvm_tgtt_lock);
1268
1269         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1270                 kfree(info);
1271                 return -EFAULT;
1272         }
1273
1274         kfree(info);
1275         return 0;
1276 }
1277
1278 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1279 {
1280         struct nvm_ioctl_get_devices *devices;
1281         struct nvm_dev *dev;
1282         int i = 0;
1283
1284         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1285         if (!devices)
1286                 return -ENOMEM;
1287
1288         down_write(&nvm_lock);
1289         list_for_each_entry(dev, &nvm_devices, devices) {
1290                 struct nvm_ioctl_device_info *info = &devices->info[i];
1291
1292                 strlcpy(info->devname, dev->name, sizeof(info->devname));
1293
1294                 /* kept for compatibility */
1295                 info->bmversion[0] = 1;
1296                 info->bmversion[1] = 0;
1297                 info->bmversion[2] = 0;
1298                 strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
1299                 i++;
1300
1301                 if (i >= ARRAY_SIZE(devices->info)) {
1302                         pr_err("max %zd devices can be reported.\n",
1303                                ARRAY_SIZE(devices->info));
1304                         break;
1305                 }
1306         }
1307         up_write(&nvm_lock);
1308
1309         devices->nr_devices = i;
1310
1311         if (copy_to_user(arg, devices,
1312                          sizeof(struct nvm_ioctl_get_devices))) {
1313                 kfree(devices);
1314                 return -EFAULT;
1315         }
1316
1317         kfree(devices);
1318         return 0;
1319 }
1320
1321 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1322 {
1323         struct nvm_ioctl_create create;
1324
1325         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1326                 return -EFAULT;
1327
1328         if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
1329             create.conf.e.rsv != 0) {
1330                 pr_err("reserved config field in use\n");
1331                 return -EINVAL;
1332         }
1333
1334         create.dev[DISK_NAME_LEN - 1] = '\0';
1335         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1336         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1337
1338         if (create.flags != 0) {
1339                 __u32 flags = create.flags;
1340
1341                 /* Check for valid flags */
1342                 if (flags & NVM_TARGET_FACTORY)
1343                         flags &= ~NVM_TARGET_FACTORY;
1344
1345                 if (flags) {
1346                         pr_err("flag not supported\n");
1347                         return -EINVAL;
1348                 }
1349         }
1350
1351         return __nvm_configure_create(&create);
1352 }
1353
1354 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1355 {
1356         struct nvm_ioctl_remove remove;
1357
1358         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1359                 return -EFAULT;
1360
1361         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1362
1363         if (remove.flags != 0) {
1364                 pr_err("no flags supported\n");
1365                 return -EINVAL;
1366         }
1367
1368         return nvm_remove_tgt(&remove);
1369 }
1370
1371 /* kept for compatibility reasons */
1372 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1373 {
1374         struct nvm_ioctl_dev_init init;
1375
1376         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1377                 return -EFAULT;
1378
1379         if (init.flags != 0) {
1380                 pr_err("no flags supported\n");
1381                 return -EINVAL;
1382         }
1383
1384         return 0;
1385 }
1386
1387 /* Kept for compatibility reasons */
1388 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1389 {
1390         struct nvm_ioctl_dev_factory fact;
1391
1392         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1393                 return -EFAULT;
1394
1395         fact.dev[DISK_NAME_LEN - 1] = '\0';
1396
1397         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1398                 return -EINVAL;
1399
1400         return 0;
1401 }
1402
1403 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1404 {
1405         void __user *argp = (void __user *)arg;
1406
1407         if (!capable(CAP_SYS_ADMIN))
1408                 return -EPERM;
1409
1410         switch (cmd) {
1411         case NVM_INFO:
1412                 return nvm_ioctl_info(file, argp);
1413         case NVM_GET_DEVICES:
1414                 return nvm_ioctl_get_devices(file, argp);
1415         case NVM_DEV_CREATE:
1416                 return nvm_ioctl_dev_create(file, argp);
1417         case NVM_DEV_REMOVE:
1418                 return nvm_ioctl_dev_remove(file, argp);
1419         case NVM_DEV_INIT:
1420                 return nvm_ioctl_dev_init(file, argp);
1421         case NVM_DEV_FACTORY:
1422                 return nvm_ioctl_dev_factory(file, argp);
1423         }
1424         return 0;
1425 }
1426
1427 static const struct file_operations _ctl_fops = {
1428         .open = nonseekable_open,
1429         .unlocked_ioctl = nvm_ctl_ioctl,
1430         .owner = THIS_MODULE,
1431         .llseek  = noop_llseek,
1432 };
1433
1434 static struct miscdevice _nvm_misc = {
1435         .minor          = MISC_DYNAMIC_MINOR,
1436         .name           = "lightnvm",
1437         .nodename       = "lightnvm/control",
1438         .fops           = &_ctl_fops,
1439 };
1440 builtin_misc_device(_nvm_misc);