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 request_queue *tqueue;
 309         struct gendisk *tdisk;
 310         struct nvm_tgt_type *tt;
 311         struct nvm_target *t;
 312         struct nvm_tgt_dev *tgt_dev;
 313         void *targetdata;
 314         unsigned int mdts;
 315         int ret;
 316
 317         switch (create->conf.type) {
 318         case NVM_CONFIG_TYPE_SIMPLE:
 319                 ret = __nvm_config_simple(dev, &create->conf.s);
 320                 if (ret)
 321                         return ret;
 322
 323                 e.lun_begin = create->conf.s.lun_begin;
 324                 e.lun_end = create->conf.s.lun_end;
 325                 e.op = NVM_TARGET_DEFAULT_OP;
 326                 break;
 327         case NVM_CONFIG_TYPE_EXTENDED:
 328                 ret = __nvm_config_extended(dev, &create->conf.e);
 329                 if (ret)
 330                         return ret;
 331
 332                 e = create->conf.e;
 333                 break;
 334         default:
 335                 pr_err("config type not valid\n");
 336                 return -EINVAL;
 337         }
 338
 339         tt = nvm_find_target_type(create->tgttype);
 340         if (!tt) {
 341                 pr_err("target type %s not found\n", create->tgttype);
 342                 return -EINVAL;
 343         }
 344
 345         if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) {
 346                 pr_err("device is incompatible with target L2P type.\n");
 347                 return -EINVAL;
 348         }
 349
 350         if (nvm_target_exists(create->tgtname)) {
 351                 pr_err("target name already exists (%s)\n",
 352                                                         create->tgtname);
 353                 return -EINVAL;
 354         }
 355
 356         ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end);
 357         if (ret)
 358                 return ret;
 359
 360         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 361         if (!t) {
 362                 ret = -ENOMEM;
 363                 goto err_reserve;
 364         }
 365
 366         tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op);
 367         if (!tgt_dev) {
 368                 pr_err("could not create target device\n");
 369                 ret = -ENOMEM;
 370                 goto err_t;
 371         }
 372
 373         tdisk = alloc_disk(0);
 374         if (!tdisk) {
 375                 ret = -ENOMEM;
 376                 goto err_dev;
 377         }
 378
 379         tqueue = blk_alloc_queue(dev->q->node);
 380         if (!tqueue) {
 381                 ret = -ENOMEM;
 382                 goto err_disk;
 383         }
 384
 385         strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 386         tdisk->flags = GENHD_FL_EXT_DEVT;
 387         tdisk->major = 0;
 388         tdisk->first_minor = 0;
 389         tdisk->fops = tt->bops;
 390         tdisk->queue = tqueue;
 391
 392         targetdata = tt->init(tgt_dev, tdisk, create->flags);
 393         if (IS_ERR(targetdata)) {
 394                 ret = PTR_ERR(targetdata);
 395                 goto err_init;
 396         }
 397
 398         tdisk->private_data = targetdata;
 399         tqueue->queuedata = targetdata;
 400
 401         mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
 402         if (dev->geo.mdts) {
 403                 mdts = min_t(u32, dev->geo.mdts,
 404                                 (dev->geo.csecs >> 9) * NVM_MAX_VLBA);
 405         }
 406         blk_queue_max_hw_sectors(tqueue, mdts);
 407
 408         set_capacity(tdisk, tt->capacity(targetdata));
 409         add_disk(tdisk);
 410
 411         if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
 412                 ret = -ENOMEM;
 413                 goto err_sysfs;
 414         }
 415
 416         t->type = tt;
 417         t->disk = tdisk;
 418         t->dev = tgt_dev;
 419
 420         mutex_lock(&dev->mlock);
 421         list_add_tail(&t->list, &dev->targets);
 422         mutex_unlock(&dev->mlock);
 423
 424         __module_get(tt->owner);
 425
 426         return 0;
 427 err_sysfs:
 428         if (tt->exit)
 429                 tt->exit(targetdata, true);
 430 err_init:
 431         blk_cleanup_queue(tqueue);
 432         tdisk->queue = NULL;
 433 err_disk:
 434         put_disk(tdisk);
 435 err_dev:
 436         nvm_remove_tgt_dev(tgt_dev, 0);
 437 err_t:
 438         kfree(t);
 439 err_reserve:
 440         nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
 441         return ret;
 442 }
 443
 444 static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 445 {
 446         struct nvm_tgt_type *tt = t->type;
 447         struct gendisk *tdisk = t->disk;
 448         struct request_queue *q = tdisk->queue;
 449
 450         del_gendisk(tdisk);
 451         blk_cleanup_queue(q);
 452
 453         if (tt->sysfs_exit)
 454                 tt->sysfs_exit(tdisk);
 455
 456         if (tt->exit)
 457                 tt->exit(tdisk->private_data, graceful);
 458
 459         nvm_remove_tgt_dev(t->dev, 1);
 460         put_disk(tdisk);
 461         module_put(t->type->owner);
 462
 463         list_del(&t->list);
 464         kfree(t);
 465 }
 466
 467 /**
 468  * nvm_remove_tgt - Removes a target from the media manager
 469  * @remove:     ioctl structure with target name to remove.
 470  *
 471  * Returns:
 472  * 0: on success
 473  * 1: on not found
 474  * <0: on error
 475  */
 476 static int nvm_remove_tgt(struct nvm_ioctl_remove *remove)
 477 {
 478         struct nvm_target *t = NULL;
 479         struct nvm_dev *dev;
 480
 481         down_read(&nvm_lock);
 482         list_for_each_entry(dev, &nvm_devices, devices) {
 483                 mutex_lock(&dev->mlock);
 484                 t = nvm_find_target(dev, remove->tgtname);
 485                 if (t) {
 486                         mutex_unlock(&dev->mlock);
 487                         break;
 488                 }
 489                 mutex_unlock(&dev->mlock);
 490         }
 491         up_read(&nvm_lock);
 492
 493         if (!t) {
 494                 pr_err("failed to remove target %s\n",
 495                                 remove->tgtname);
 496                 return 1;
 497         }
 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("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, void *buf)
 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, buf);
 749         if (ret)
 750                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 751         return ret;
 752 }
 753 EXPORT_SYMBOL(nvm_submit_io);
 754
 755 static void nvm_sync_end_io(struct nvm_rq *rqd)
 756 {
 757         struct completion *waiting = rqd->private;
 758
 759         complete(waiting);
 760 }
 761
 762 static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
 763                               void *buf)
 764 {
 765         DECLARE_COMPLETION_ONSTACK(wait);
 766         int ret = 0;
 767
 768         rqd->end_io = nvm_sync_end_io;
 769         rqd->private = &wait;
 770
 771         ret = dev->ops->submit_io(dev, rqd, buf);
 772         if (ret)
 773                 return ret;
 774
 775         wait_for_completion_io(&wait);
 776
 777         return 0;
 778 }
 779
 780 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 781                        void *buf)
 782 {
 783         struct nvm_dev *dev = tgt_dev->parent;
 784         int ret;
 785
 786         if (!dev->ops->submit_io)
 787                 return -ENODEV;
 788
 789         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 790
 791         rqd->dev = tgt_dev;
 792         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 793
 794         ret = nvm_submit_io_wait(dev, rqd, buf);
 795
 796         return ret;
 797 }
 798 EXPORT_SYMBOL(nvm_submit_io_sync);
 799
 800 void nvm_end_io(struct nvm_rq *rqd)
 801 {
 802         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 803
 804         /* Convert address space */
 805         if (tgt_dev)
 806                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 807
 808         if (rqd->end_io)
 809                 rqd->end_io(rqd);
 810 }
 811 EXPORT_SYMBOL(nvm_end_io);
 812
 813 static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
 814 {
 815         if (!dev->ops->submit_io)
 816                 return -ENODEV;
 817
 818         rqd->dev = NULL;
 819         rqd->flags = nvm_set_flags(&dev->geo, rqd);
 820
 821         return nvm_submit_io_wait(dev, rqd, NULL);
 822 }
 823
 824 static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
 825 {
 826         struct nvm_rq rqd = { NULL };
 827         struct bio bio;
 828         struct bio_vec bio_vec;
 829         struct page *page;
 830         int ret;
 831
 832         page = alloc_page(GFP_KERNEL);
 833         if (!page)
 834                 return -ENOMEM;
 835
 836         bio_init(&bio, &bio_vec, 1);
 837         bio_add_page(&bio, page, PAGE_SIZE, 0);
 838         bio_set_op_attrs(&bio, REQ_OP_READ, 0);
 839
 840         rqd.bio = &bio;
 841         rqd.opcode = NVM_OP_PREAD;
 842         rqd.is_seq = 1;
 843         rqd.nr_ppas = 1;
 844         rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 845
 846         ret = nvm_submit_io_sync_raw(dev, &rqd);
 847         __free_page(page);
 848         if (ret)
 849                 return ret;
 850
 851         return rqd.error;
 852 }
 853
 854 /*
 855  * Scans a 1.2 chunk first and last page to determine if its state.
 856  * If the chunk is found to be open, also scan it to update the write
 857  * pointer.
 858  */
 859 static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
 860                              struct nvm_chk_meta *meta)
 861 {
 862         struct nvm_geo *geo = &dev->geo;
 863         int ret, pg, pl;
 864
 865         /* sense first page */
 866         ret = nvm_bb_chunk_sense(dev, ppa);
 867         if (ret < 0) /* io error */
 868                 return ret;
 869         else if (ret == 0) /* valid data */
 870                 meta->state = NVM_CHK_ST_OPEN;
 871         else if (ret > 0) {
 872                 /*
 873                  * If empty page, the chunk is free, else it is an
 874                  * actual io error. In that case, mark it offline.
 875                  */
 876                 switch (ret) {
 877                 case NVM_RSP_ERR_EMPTYPAGE:
 878                         meta->state = NVM_CHK_ST_FREE;
 879                         return 0;
 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                         goto scan;
 885                 default:
 886                         return -ret; /* other io error */
 887                 }
 888         }
 889
 890         /* sense last page */
 891         ppa.g.pg = geo->num_pg - 1;
 892         ppa.g.pl = geo->num_pln - 1;
 893
 894         ret = nvm_bb_chunk_sense(dev, ppa);
 895         if (ret < 0) /* io error */
 896                 return ret;
 897         else if (ret == 0) { /* Chunk fully written */
 898                 meta->state = NVM_CHK_ST_CLOSED;
 899                 meta->wp = geo->clba;
 900                 return 0;
 901         } else if (ret > 0) {
 902                 switch (ret) {
 903                 case NVM_RSP_ERR_EMPTYPAGE:
 904                 case NVM_RSP_ERR_FAILCRC:
 905                 case NVM_RSP_ERR_FAILECC:
 906                 case NVM_RSP_WARN_HIGHECC:
 907                         meta->state = NVM_CHK_ST_OPEN;
 908                         break;
 909                 default:
 910                         return -ret; /* other io error */
 911                 }
 912         }
 913
 914 scan:
 915         /*
 916          * chunk is open, we scan sequentially to update the write pointer.
 917          * We make the assumption that targets write data across all planes
 918          * before moving to the next page.
 919          */
 920         for (pg = 0; pg < geo->num_pg; pg++) {
 921                 for (pl = 0; pl < geo->num_pln; pl++) {
 922                         ppa.g.pg = pg;
 923                         ppa.g.pl = pl;
 924
 925                         ret = nvm_bb_chunk_sense(dev, ppa);
 926                         if (ret < 0) /* io error */
 927                                 return ret;
 928                         else if (ret == 0) {
 929                                 meta->wp += geo->ws_min;
 930                         } else if (ret > 0) {
 931                                 switch (ret) {
 932                                 case NVM_RSP_ERR_EMPTYPAGE:
 933                                         return 0;
 934                                 case NVM_RSP_ERR_FAILCRC:
 935                                 case NVM_RSP_ERR_FAILECC:
 936                                 case NVM_RSP_WARN_HIGHECC:
 937                                         meta->wp += geo->ws_min;
 938                                         break;
 939                                 default:
 940                                         return -ret; /* other io error */
 941                                 }
 942                         }
 943                 }
 944         }
 945
 946         return 0;
 947 }
 948
 949 /*
 950  * folds a bad block list from its plane representation to its
 951  * chunk representation.
 952  *
 953  * If any of the planes status are bad or grown bad, the chunk is marked
 954  * offline. If not bad, the first plane state acts as the chunk state.
 955  */
 956 static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
 957                            u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
 958 {
 959         struct nvm_geo *geo = &dev->geo;
 960         int ret, blk, pl, offset, blktype;
 961
 962         for (blk = 0; blk < geo->num_chk; blk++) {
 963                 offset = blk * geo->pln_mode;
 964                 blktype = blks[offset];
 965
 966                 for (pl = 0; pl < geo->pln_mode; pl++) {
 967                         if (blks[offset + pl] &
 968                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 969                                 blktype = blks[offset + pl];
 970                                 break;
 971                         }
 972                 }
 973
 974                 ppa.g.blk = blk;
 975
 976                 meta->wp = 0;
 977                 meta->type = NVM_CHK_TP_W_SEQ;
 978                 meta->wi = 0;
 979                 meta->slba = generic_to_dev_addr(dev, ppa).ppa;
 980                 meta->cnlb = dev->geo.clba;
 981
 982                 if (blktype == NVM_BLK_T_FREE) {
 983                         ret = nvm_bb_chunk_scan(dev, ppa, meta);
 984                         if (ret)
 985                                 return ret;
 986                 } else {
 987                         meta->state = NVM_CHK_ST_OFFLINE;
 988                 }
 989
 990                 meta++;
 991         }
 992
 993         return 0;
 994 }
 995
 996 static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
 997                            int nchks, struct nvm_chk_meta *meta)
 998 {
 999         struct nvm_geo *geo = &dev->geo;
1000         struct ppa_addr ppa;
1001         u8 *blks;
1002         int ch, lun, nr_blks;
1003         int ret = 0;
1004
1005         ppa.ppa = slba;
1006         ppa = dev_to_generic_addr(dev, ppa);
1007
1008         if (ppa.g.blk != 0)
1009                 return -EINVAL;
1010
1011         if ((nchks % geo->num_chk) != 0)
1012                 return -EINVAL;
1013
1014         nr_blks = geo->num_chk * geo->pln_mode;
1015
1016         blks = kmalloc(nr_blks, GFP_KERNEL);
1017         if (!blks)
1018                 return -ENOMEM;
1019
1020         for (ch = ppa.g.ch; ch < geo->num_ch; ch++) {
1021                 for (lun = ppa.g.lun; lun < geo->num_lun; lun++) {
1022                         struct ppa_addr ppa_gen, ppa_dev;
1023
1024                         if (!nchks)
1025                                 goto done;
1026
1027                         ppa_gen.ppa = 0;
1028                         ppa_gen.g.ch = ch;
1029                         ppa_gen.g.lun = lun;
1030                         ppa_dev = generic_to_dev_addr(dev, ppa_gen);
1031
1032                         ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks);
1033                         if (ret)
1034                                 goto done;
1035
1036                         ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks,
1037                                                                         meta);
1038                         if (ret)
1039                                 goto done;
1040
1041                         meta += geo->num_chk;
1042                         nchks -= geo->num_chk;
1043                 }
1044         }
1045 done:
1046         kfree(blks);
1047         return ret;
1048 }
1049
1050 int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
1051                        int nchks, struct nvm_chk_meta *meta)
1052 {
1053         struct nvm_dev *dev = tgt_dev->parent;
1054
1055         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
1056
1057         if (dev->geo.version == NVM_OCSSD_SPEC_12)
1058                 return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1059
1060         return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1061 }
1062 EXPORT_SYMBOL_GPL(nvm_get_chunk_meta);
1063
1064 int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
1065                        int nr_ppas, int type)
1066 {
1067         struct nvm_dev *dev = tgt_dev->parent;
1068         struct nvm_rq rqd;
1069         int ret;
1070
1071         if (dev->geo.version == NVM_OCSSD_SPEC_20)
1072                 return 0;
1073
1074         if (nr_ppas > NVM_MAX_VLBA) {
1075                 pr_err("unable to update all blocks atomically\n");
1076                 return -EINVAL;
1077         }
1078
1079         memset(&rqd, 0, sizeof(struct nvm_rq));
1080
1081         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
1082         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
1083
1084         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
1085         nvm_free_rqd_ppalist(tgt_dev, &rqd);
1086         if (ret)
1087                 return -EINVAL;
1088
1089         return 0;
1090 }
1091 EXPORT_SYMBOL_GPL(nvm_set_chunk_meta);
1092
1093 static int nvm_core_init(struct nvm_dev *dev)
1094 {
1095         struct nvm_geo *geo = &dev->geo;
1096         int ret;
1097
1098         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
1099                                         sizeof(unsigned long), GFP_KERNEL);
1100         if (!dev->lun_map)
1101                 return -ENOMEM;
1102
1103         INIT_LIST_HEAD(&dev->area_list);
1104         INIT_LIST_HEAD(&dev->targets);
1105         mutex_init(&dev->mlock);
1106         spin_lock_init(&dev->lock);
1107
1108         ret = nvm_register_map(dev);
1109         if (ret)
1110                 goto err_fmtype;
1111
1112         return 0;
1113 err_fmtype:
1114         kfree(dev->lun_map);
1115         return ret;
1116 }
1117
1118 static void nvm_free(struct kref *ref)
1119 {
1120         struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref);
1121
1122         if (dev->dma_pool)
1123                 dev->ops->destroy_dma_pool(dev->dma_pool);
1124
1125         if (dev->rmap)
1126                 nvm_unregister_map(dev);
1127
1128         kfree(dev->lun_map);
1129         kfree(dev);
1130 }
1131
1132 static int nvm_init(struct nvm_dev *dev)
1133 {
1134         struct nvm_geo *geo = &dev->geo;
1135         int ret = -EINVAL;
1136
1137         if (dev->ops->identity(dev)) {
1138                 pr_err("device could not be identified\n");
1139                 goto err;
1140         }
1141
1142         pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id,
1143                         geo->minor_ver_id, geo->vmnt);
1144
1145         ret = nvm_core_init(dev);
1146         if (ret) {
1147                 pr_err("could not initialize core structures.\n");
1148                 goto err;
1149         }
1150
1151         pr_info("registered %s [%u/%u/%u/%u/%u]\n",
1152                         dev->name, dev->geo.ws_min, dev->geo.ws_opt,
1153                         dev->geo.num_chk, dev->geo.all_luns,
1154                         dev->geo.num_ch);
1155         return 0;
1156 err:
1157         pr_err("failed to initialize nvm\n");
1158         return ret;
1159 }
1160
1161 struct nvm_dev *nvm_alloc_dev(int node)
1162 {
1163         struct nvm_dev *dev;
1164
1165         dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1166         if (dev)
1167                 kref_init(&dev->ref);
1168
1169         return dev;
1170 }
1171 EXPORT_SYMBOL(nvm_alloc_dev);
1172
1173 int nvm_register(struct nvm_dev *dev)
1174 {
1175         int ret, exp_pool_size;
1176
1177         pr_warn_once("lightnvm support is deprecated and will be removed in Linux 5.15.\n");
1178
1179         if (!dev->q || !dev->ops) {
1180                 kref_put(&dev->ref, nvm_free);
1181                 return -EINVAL;
1182         }
1183
1184         ret = nvm_init(dev);
1185         if (ret) {
1186                 kref_put(&dev->ref, nvm_free);
1187                 return ret;
1188         }
1189
1190         exp_pool_size = max_t(int, PAGE_SIZE,
1191                               (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
1192         exp_pool_size = round_up(exp_pool_size, PAGE_SIZE);
1193
1194         dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist",
1195                                                   exp_pool_size);
1196         if (!dev->dma_pool) {
1197                 pr_err("could not create dma pool\n");
1198                 kref_put(&dev->ref, nvm_free);
1199                 return -ENOMEM;
1200         }
1201
1202         /* register device with a supported media manager */
1203         down_write(&nvm_lock);
1204         list_add(&dev->devices, &nvm_devices);
1205         up_write(&nvm_lock);
1206
1207         return 0;
1208 }
1209 EXPORT_SYMBOL(nvm_register);
1210
1211 void nvm_unregister(struct nvm_dev *dev)
1212 {
1213         struct nvm_target *t, *tmp;
1214
1215         mutex_lock(&dev->mlock);
1216         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1217                 if (t->dev->parent != dev)
1218                         continue;
1219                 __nvm_remove_target(t, false);
1220                 kref_put(&dev->ref, nvm_free);
1221         }
1222         mutex_unlock(&dev->mlock);
1223
1224         down_write(&nvm_lock);
1225         list_del(&dev->devices);
1226         up_write(&nvm_lock);
1227
1228         kref_put(&dev->ref, nvm_free);
1229 }
1230 EXPORT_SYMBOL(nvm_unregister);
1231
1232 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1233 {
1234         struct nvm_dev *dev;
1235         int ret;
1236
1237         down_write(&nvm_lock);
1238         dev = nvm_find_nvm_dev(create->dev);
1239         up_write(&nvm_lock);
1240
1241         if (!dev) {
1242                 pr_err("device not found\n");
1243                 return -EINVAL;
1244         }
1245
1246         kref_get(&dev->ref);
1247         ret = nvm_create_tgt(dev, create);
1248         if (ret)
1249                 kref_put(&dev->ref, nvm_free);
1250
1251         return ret;
1252 }
1253
1254 static long nvm_ioctl_info(struct file *file, void __user *arg)
1255 {
1256         struct nvm_ioctl_info *info;
1257         struct nvm_tgt_type *tt;
1258         int tgt_iter = 0;
1259
1260         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1261         if (IS_ERR(info))
1262                 return PTR_ERR(info);
1263
1264         info->version[0] = NVM_VERSION_MAJOR;
1265         info->version[1] = NVM_VERSION_MINOR;
1266         info->version[2] = NVM_VERSION_PATCH;
1267
1268         down_write(&nvm_tgtt_lock);
1269         list_for_each_entry(tt, &nvm_tgt_types, list) {
1270                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1271
1272                 tgt->version[0] = tt->version[0];
1273                 tgt->version[1] = tt->version[1];
1274                 tgt->version[2] = tt->version[2];
1275                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1276
1277                 tgt_iter++;
1278         }
1279
1280         info->tgtsize = tgt_iter;
1281         up_write(&nvm_tgtt_lock);
1282
1283         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1284                 kfree(info);
1285                 return -EFAULT;
1286         }
1287
1288         kfree(info);
1289         return 0;
1290 }
1291
1292 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1293 {
1294         struct nvm_ioctl_get_devices *devices;
1295         struct nvm_dev *dev;
1296         int i = 0;
1297
1298         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1299         if (!devices)
1300                 return -ENOMEM;
1301
1302         down_write(&nvm_lock);
1303         list_for_each_entry(dev, &nvm_devices, devices) {
1304                 struct nvm_ioctl_device_info *info = &devices->info[i];
1305
1306                 strlcpy(info->devname, dev->name, sizeof(info->devname));
1307
1308                 /* kept for compatibility */
1309                 info->bmversion[0] = 1;
1310                 info->bmversion[1] = 0;
1311                 info->bmversion[2] = 0;
1312                 strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
1313                 i++;
1314
1315                 if (i >= ARRAY_SIZE(devices->info)) {
1316                         pr_err("max %zd devices can be reported.\n",
1317                                ARRAY_SIZE(devices->info));
1318                         break;
1319                 }
1320         }
1321         up_write(&nvm_lock);
1322
1323         devices->nr_devices = i;
1324
1325         if (copy_to_user(arg, devices,
1326                          sizeof(struct nvm_ioctl_get_devices))) {
1327                 kfree(devices);
1328                 return -EFAULT;
1329         }
1330
1331         kfree(devices);
1332         return 0;
1333 }
1334
1335 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1336 {
1337         struct nvm_ioctl_create create;
1338
1339         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1340                 return -EFAULT;
1341
1342         if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
1343             create.conf.e.rsv != 0) {
1344                 pr_err("reserved config field in use\n");
1345                 return -EINVAL;
1346         }
1347
1348         create.dev[DISK_NAME_LEN - 1] = '\0';
1349         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1350         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1351
1352         if (create.flags != 0) {
1353                 __u32 flags = create.flags;
1354
1355                 /* Check for valid flags */
1356                 if (flags & NVM_TARGET_FACTORY)
1357                         flags &= ~NVM_TARGET_FACTORY;
1358
1359                 if (flags) {
1360                         pr_err("flag not supported\n");
1361                         return -EINVAL;
1362                 }
1363         }
1364
1365         return __nvm_configure_create(&create);
1366 }
1367
1368 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1369 {
1370         struct nvm_ioctl_remove remove;
1371
1372         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1373                 return -EFAULT;
1374
1375         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1376
1377         if (remove.flags != 0) {
1378                 pr_err("no flags supported\n");
1379                 return -EINVAL;
1380         }
1381
1382         return nvm_remove_tgt(&remove);
1383 }
1384
1385 /* kept for compatibility reasons */
1386 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1387 {
1388         struct nvm_ioctl_dev_init init;
1389
1390         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1391                 return -EFAULT;
1392
1393         if (init.flags != 0) {
1394                 pr_err("no flags supported\n");
1395                 return -EINVAL;
1396         }
1397
1398         return 0;
1399 }
1400
1401 /* Kept for compatibility reasons */
1402 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1403 {
1404         struct nvm_ioctl_dev_factory fact;
1405
1406         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1407                 return -EFAULT;
1408
1409         fact.dev[DISK_NAME_LEN - 1] = '\0';
1410
1411         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1412                 return -EINVAL;
1413
1414         return 0;
1415 }
1416
1417 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1418 {
1419         void __user *argp = (void __user *)arg;
1420
1421         if (!capable(CAP_SYS_ADMIN))
1422                 return -EPERM;
1423
1424         switch (cmd) {
1425         case NVM_INFO:
1426                 return nvm_ioctl_info(file, argp);
1427         case NVM_GET_DEVICES:
1428                 return nvm_ioctl_get_devices(file, argp);
1429         case NVM_DEV_CREATE:
1430                 return nvm_ioctl_dev_create(file, argp);
1431         case NVM_DEV_REMOVE:
1432                 return nvm_ioctl_dev_remove(file, argp);
1433         case NVM_DEV_INIT:
1434                 return nvm_ioctl_dev_init(file, argp);
1435         case NVM_DEV_FACTORY:
1436                 return nvm_ioctl_dev_factory(file, argp);
1437         }
1438         return 0;
1439 }
1440
1441 static const struct file_operations _ctl_fops = {
1442         .open = nonseekable_open,
1443         .unlocked_ioctl = nvm_ctl_ioctl,
1444         .owner = THIS_MODULE,
1445         .llseek  = noop_llseek,
1446 };
1447
1448 static struct miscdevice _nvm_misc = {
1449         .minor          = MISC_DYNAMIC_MINOR,
1450         .name           = "lightnvm",
1451         .nodename       = "lightnvm/control",
1452         .fops           = &_ctl_fops,
1453 };
1454 builtin_misc_device(_nvm_misc);