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