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 const struct block_device_operations nvm_fops = {
 240         .owner          = THIS_MODULE,
 241 };
 242
 243 static struct nvm_tgt_type *__nvm_find_target_type(const char *name)
 244 {
 245         struct nvm_tgt_type *tt;
 246
 247         list_for_each_entry(tt, &nvm_tgt_types, list)
 248                 if (!strcmp(name, tt->name))
 249                         return tt;
 250
 251         return NULL;
 252 }
 253
 254 static struct nvm_tgt_type *nvm_find_target_type(const char *name)
 255 {
 256         struct nvm_tgt_type *tt;
 257
 258         down_write(&nvm_tgtt_lock);
 259         tt = __nvm_find_target_type(name);
 260         up_write(&nvm_tgtt_lock);
 261
 262         return tt;
 263 }
 264
 265 static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin,
 266                                  int lun_end)
 267 {
 268         if (lun_begin > lun_end || lun_end >= geo->all_luns) {
 269                 pr_err("lun out of bound (%u:%u > %u)\n",
 270                         lun_begin, lun_end, geo->all_luns - 1);
 271                 return -EINVAL;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int __nvm_config_simple(struct nvm_dev *dev,
 278                                struct nvm_ioctl_create_simple *s)
 279 {
 280         struct nvm_geo *geo = &dev->geo;
 281
 282         if (s->lun_begin == -1 && s->lun_end == -1) {
 283                 s->lun_begin = 0;
 284                 s->lun_end = geo->all_luns - 1;
 285         }
 286
 287         return nvm_config_check_luns(geo, s->lun_begin, s->lun_end);
 288 }
 289
 290 static int __nvm_config_extended(struct nvm_dev *dev,
 291                                  struct nvm_ioctl_create_extended *e)
 292 {
 293         if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) {
 294                 e->lun_begin = 0;
 295                 e->lun_end = dev->geo.all_luns - 1;
 296         }
 297
 298         /* op not set falls into target's default */
 299         if (e->op == 0xFFFF) {
 300                 e->op = NVM_TARGET_DEFAULT_OP;
 301         } else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) {
 302                 pr_err("invalid over provisioning value\n");
 303                 return -EINVAL;
 304         }
 305
 306         return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end);
 307 }
 308
 309 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 310 {
 311         struct nvm_ioctl_create_extended e;
 312         struct request_queue *tqueue;
 313         struct gendisk *tdisk;
 314         struct nvm_tgt_type *tt;
 315         struct nvm_target *t;
 316         struct nvm_tgt_dev *tgt_dev;
 317         void *targetdata;
 318         unsigned int mdts;
 319         int ret;
 320
 321         switch (create->conf.type) {
 322         case NVM_CONFIG_TYPE_SIMPLE:
 323                 ret = __nvm_config_simple(dev, &create->conf.s);
 324                 if (ret)
 325                         return ret;
 326
 327                 e.lun_begin = create->conf.s.lun_begin;
 328                 e.lun_end = create->conf.s.lun_end;
 329                 e.op = NVM_TARGET_DEFAULT_OP;
 330                 break;
 331         case NVM_CONFIG_TYPE_EXTENDED:
 332                 ret = __nvm_config_extended(dev, &create->conf.e);
 333                 if (ret)
 334                         return ret;
 335
 336                 e = create->conf.e;
 337                 break;
 338         default:
 339                 pr_err("config type not valid\n");
 340                 return -EINVAL;
 341         }
 342
 343         tt = nvm_find_target_type(create->tgttype);
 344         if (!tt) {
 345                 pr_err("target type %s not found\n", create->tgttype);
 346                 return -EINVAL;
 347         }
 348
 349         if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) {
 350                 pr_err("device is incompatible with target L2P type.\n");
 351                 return -EINVAL;
 352         }
 353
 354         if (nvm_target_exists(create->tgtname)) {
 355                 pr_err("target name already exists (%s)\n",
 356                                                         create->tgtname);
 357                 return -EINVAL;
 358         }
 359
 360         ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end);
 361         if (ret)
 362                 return ret;
 363
 364         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 365         if (!t) {
 366                 ret = -ENOMEM;
 367                 goto err_reserve;
 368         }
 369
 370         tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op);
 371         if (!tgt_dev) {
 372                 pr_err("could not create target device\n");
 373                 ret = -ENOMEM;
 374                 goto err_t;
 375         }
 376
 377         tdisk = alloc_disk(0);
 378         if (!tdisk) {
 379                 ret = -ENOMEM;
 380                 goto err_dev;
 381         }
 382
 383         tqueue = blk_alloc_queue(tt->make_rq, dev->q->node);
 384         if (!tqueue) {
 385                 ret = -ENOMEM;
 386                 goto err_disk;
 387         }
 388
 389         strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 390         tdisk->flags = GENHD_FL_EXT_DEVT;
 391         tdisk->major = 0;
 392         tdisk->first_minor = 0;
 393         tdisk->fops = &nvm_fops;
 394         tdisk->queue = tqueue;
 395
 396         targetdata = tt->init(tgt_dev, tdisk, create->flags);
 397         if (IS_ERR(targetdata)) {
 398                 ret = PTR_ERR(targetdata);
 399                 goto err_init;
 400         }
 401
 402         tdisk->private_data = targetdata;
 403         tqueue->queuedata = targetdata;
 404
 405         mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
 406         if (dev->geo.mdts) {
 407                 mdts = min_t(u32, dev->geo.mdts,
 408                                 (dev->geo.csecs >> 9) * NVM_MAX_VLBA);
 409         }
 410         blk_queue_max_hw_sectors(tqueue, mdts);
 411
 412         set_capacity(tdisk, tt->capacity(targetdata));
 413         add_disk(tdisk);
 414
 415         if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
 416                 ret = -ENOMEM;
 417                 goto err_sysfs;
 418         }
 419
 420         t->type = tt;
 421         t->disk = tdisk;
 422         t->dev = tgt_dev;
 423
 424         mutex_lock(&dev->mlock);
 425         list_add_tail(&t->list, &dev->targets);
 426         mutex_unlock(&dev->mlock);
 427
 428         __module_get(tt->owner);
 429
 430         return 0;
 431 err_sysfs:
 432         if (tt->exit)
 433                 tt->exit(targetdata, true);
 434 err_init:
 435         blk_cleanup_queue(tqueue);
 436         tdisk->queue = NULL;
 437 err_disk:
 438         put_disk(tdisk);
 439 err_dev:
 440         nvm_remove_tgt_dev(tgt_dev, 0);
 441 err_t:
 442         kfree(t);
 443 err_reserve:
 444         nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
 445         return ret;
 446 }
 447
 448 static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 449 {
 450         struct nvm_tgt_type *tt = t->type;
 451         struct gendisk *tdisk = t->disk;
 452         struct request_queue *q = tdisk->queue;
 453
 454         del_gendisk(tdisk);
 455         blk_cleanup_queue(q);
 456
 457         if (tt->sysfs_exit)
 458                 tt->sysfs_exit(tdisk);
 459
 460         if (tt->exit)
 461                 tt->exit(tdisk->private_data, graceful);
 462
 463         nvm_remove_tgt_dev(t->dev, 1);
 464         put_disk(tdisk);
 465         module_put(t->type->owner);
 466
 467         list_del(&t->list);
 468         kfree(t);
 469 }
 470
 471 /**
 472  * nvm_remove_tgt - Removes a target from the media manager
 473  * @remove:     ioctl structure with target name to remove.
 474  *
 475  * Returns:
 476  * 0: on success
 477  * 1: on not found
 478  * <0: on error
 479  */
 480 static int nvm_remove_tgt(struct nvm_ioctl_remove *remove)
 481 {
 482         struct nvm_target *t = NULL;
 483         struct nvm_dev *dev;
 484
 485         down_read(&nvm_lock);
 486         list_for_each_entry(dev, &nvm_devices, devices) {
 487                 mutex_lock(&dev->mlock);
 488                 t = nvm_find_target(dev, remove->tgtname);
 489                 if (t) {
 490                         mutex_unlock(&dev->mlock);
 491                         break;
 492                 }
 493                 mutex_unlock(&dev->mlock);
 494         }
 495         up_read(&nvm_lock);
 496
 497         if (!t) {
 498                 pr_err("failed to remove target %s\n",
 499                                 remove->tgtname);
 500                 return 1;
 501         }
 502
 503         __nvm_remove_target(t, true);
 504         kref_put(&dev->ref, nvm_free);
 505
 506         return 0;
 507 }
 508
 509 static int nvm_register_map(struct nvm_dev *dev)
 510 {
 511         struct nvm_dev_map *rmap;
 512         int i, j;
 513
 514         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 515         if (!rmap)
 516                 goto err_rmap;
 517
 518         rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map),
 519                                                                 GFP_KERNEL);
 520         if (!rmap->chnls)
 521                 goto err_chnls;
 522
 523         for (i = 0; i < dev->geo.num_ch; i++) {
 524                 struct nvm_ch_map *ch_rmap;
 525                 int *lun_roffs;
 526                 int luns_in_chnl = dev->geo.num_lun;
 527
 528                 ch_rmap = &rmap->chnls[i];
 529
 530                 ch_rmap->ch_off = -1;
 531                 ch_rmap->num_lun = luns_in_chnl;
 532
 533                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 534                 if (!lun_roffs)
 535                         goto err_ch;
 536
 537                 for (j = 0; j < luns_in_chnl; j++)
 538                         lun_roffs[j] = -1;
 539
 540                 ch_rmap->lun_offs = lun_roffs;
 541         }
 542
 543         dev->rmap = rmap;
 544
 545         return 0;
 546 err_ch:
 547         while (--i >= 0)
 548                 kfree(rmap->chnls[i].lun_offs);
 549 err_chnls:
 550         kfree(rmap);
 551 err_rmap:
 552         return -ENOMEM;
 553 }
 554
 555 static void nvm_unregister_map(struct nvm_dev *dev)
 556 {
 557         struct nvm_dev_map *rmap = dev->rmap;
 558         int i;
 559
 560         for (i = 0; i < dev->geo.num_ch; i++)
 561                 kfree(rmap->chnls[i].lun_offs);
 562
 563         kfree(rmap->chnls);
 564         kfree(rmap);
 565 }
 566
 567 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 568 {
 569         struct nvm_dev_map *dev_map = tgt_dev->map;
 570         struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch];
 571         int lun_off = ch_map->lun_offs[p->a.lun];
 572
 573         p->a.ch += ch_map->ch_off;
 574         p->a.lun += lun_off;
 575 }
 576
 577 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 578 {
 579         struct nvm_dev *dev = tgt_dev->parent;
 580         struct nvm_dev_map *dev_rmap = dev->rmap;
 581         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch];
 582         int lun_roff = ch_rmap->lun_offs[p->a.lun];
 583
 584         p->a.ch -= ch_rmap->ch_off;
 585         p->a.lun -= lun_roff;
 586 }
 587
 588 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 589                                 struct ppa_addr *ppa_list, int nr_ppas)
 590 {
 591         int i;
 592
 593         for (i = 0; i < nr_ppas; i++) {
 594                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 595                 ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]);
 596         }
 597 }
 598
 599 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 600                                 struct ppa_addr *ppa_list, int nr_ppas)
 601 {
 602         int i;
 603
 604         for (i = 0; i < nr_ppas; i++) {
 605                 ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]);
 606                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 607         }
 608 }
 609
 610 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 611 {
 612         struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
 613
 614         nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas);
 615 }
 616
 617 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 618 {
 619         struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
 620
 621         nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas);
 622 }
 623
 624 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 625 {
 626         int ret = 0;
 627
 628         down_write(&nvm_tgtt_lock);
 629         if (__nvm_find_target_type(tt->name))
 630                 ret = -EEXIST;
 631         else
 632                 list_add(&tt->list, &nvm_tgt_types);
 633         up_write(&nvm_tgtt_lock);
 634
 635         return ret;
 636 }
 637 EXPORT_SYMBOL(nvm_register_tgt_type);
 638
 639 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 640 {
 641         if (!tt)
 642                 return;
 643
 644         down_write(&nvm_tgtt_lock);
 645         list_del(&tt->list);
 646         up_write(&nvm_tgtt_lock);
 647 }
 648 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 649
 650 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 651                                                         dma_addr_t *dma_handler)
 652 {
 653         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 654                                                                 dma_handler);
 655 }
 656 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 657
 658 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 659 {
 660         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 661 }
 662 EXPORT_SYMBOL(nvm_dev_dma_free);
 663
 664 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 665 {
 666         struct nvm_dev *dev;
 667
 668         list_for_each_entry(dev, &nvm_devices, devices)
 669                 if (!strcmp(name, dev->name))
 670                         return dev;
 671
 672         return NULL;
 673 }
 674
 675 static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 676                         const struct ppa_addr *ppas, int nr_ppas)
 677 {
 678         struct nvm_dev *dev = tgt_dev->parent;
 679         struct nvm_geo *geo = &tgt_dev->geo;
 680         int i, plane_cnt, pl_idx;
 681         struct ppa_addr ppa;
 682
 683         if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
 684                 rqd->nr_ppas = nr_ppas;
 685                 rqd->ppa_addr = ppas[0];
 686
 687                 return 0;
 688         }
 689
 690         rqd->nr_ppas = nr_ppas;
 691         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 692         if (!rqd->ppa_list) {
 693                 pr_err("failed to allocate dma memory\n");
 694                 return -ENOMEM;
 695         }
 696
 697         plane_cnt = geo->pln_mode;
 698         rqd->nr_ppas *= plane_cnt;
 699
 700         for (i = 0; i < nr_ppas; i++) {
 701                 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 702                         ppa = ppas[i];
 703                         ppa.g.pl = pl_idx;
 704                         rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 705                 }
 706         }
 707
 708         return 0;
 709 }
 710
 711 static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
 712                         struct nvm_rq *rqd)
 713 {
 714         if (!rqd->ppa_list)
 715                 return;
 716
 717         nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
 718 }
 719
 720 static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
 721 {
 722         int flags = 0;
 723
 724         if (geo->version == NVM_OCSSD_SPEC_20)
 725                 return 0;
 726
 727         if (rqd->is_seq)
 728                 flags |= geo->pln_mode >> 1;
 729
 730         if (rqd->opcode == NVM_OP_PREAD)
 731                 flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND);
 732         else if (rqd->opcode == NVM_OP_PWRITE)
 733                 flags |= NVM_IO_SCRAMBLE_ENABLE;
 734
 735         return flags;
 736 }
 737
 738 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf)
 739 {
 740         struct nvm_dev *dev = tgt_dev->parent;
 741         int ret;
 742
 743         if (!dev->ops->submit_io)
 744                 return -ENODEV;
 745
 746         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 747
 748         rqd->dev = tgt_dev;
 749         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 750
 751         /* In case of error, fail with right address format */
 752         ret = dev->ops->submit_io(dev, rqd, buf);
 753         if (ret)
 754                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 755         return ret;
 756 }
 757 EXPORT_SYMBOL(nvm_submit_io);
 758
 759 static void nvm_sync_end_io(struct nvm_rq *rqd)
 760 {
 761         struct completion *waiting = rqd->private;
 762
 763         complete(waiting);
 764 }
 765
 766 static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
 767                               void *buf)
 768 {
 769         DECLARE_COMPLETION_ONSTACK(wait);
 770         int ret = 0;
 771
 772         rqd->end_io = nvm_sync_end_io;
 773         rqd->private = &wait;
 774
 775         ret = dev->ops->submit_io(dev, rqd, buf);
 776         if (ret)
 777                 return ret;
 778
 779         wait_for_completion_io(&wait);
 780
 781         return 0;
 782 }
 783
 784 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 785                        void *buf)
 786 {
 787         struct nvm_dev *dev = tgt_dev->parent;
 788         int ret;
 789
 790         if (!dev->ops->submit_io)
 791                 return -ENODEV;
 792
 793         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 794
 795         rqd->dev = tgt_dev;
 796         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 797
 798         ret = nvm_submit_io_wait(dev, rqd, buf);
 799
 800         return ret;
 801 }
 802 EXPORT_SYMBOL(nvm_submit_io_sync);
 803
 804 void nvm_end_io(struct nvm_rq *rqd)
 805 {
 806         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 807
 808         /* Convert address space */
 809         if (tgt_dev)
 810                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 811
 812         if (rqd->end_io)
 813                 rqd->end_io(rqd);
 814 }
 815 EXPORT_SYMBOL(nvm_end_io);
 816
 817 static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
 818 {
 819         if (!dev->ops->submit_io)
 820                 return -ENODEV;
 821
 822         rqd->dev = NULL;
 823         rqd->flags = nvm_set_flags(&dev->geo, rqd);
 824
 825         return nvm_submit_io_wait(dev, rqd, NULL);
 826 }
 827
 828 static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
 829 {
 830         struct nvm_rq rqd = { NULL };
 831         struct bio bio;
 832         struct bio_vec bio_vec;
 833         struct page *page;
 834         int ret;
 835
 836         page = alloc_page(GFP_KERNEL);
 837         if (!page)
 838                 return -ENOMEM;
 839
 840         bio_init(&bio, &bio_vec, 1);
 841         bio_add_page(&bio, page, PAGE_SIZE, 0);
 842         bio_set_op_attrs(&bio, REQ_OP_READ, 0);
 843
 844         rqd.bio = &bio;
 845         rqd.opcode = NVM_OP_PREAD;
 846         rqd.is_seq = 1;
 847         rqd.nr_ppas = 1;
 848         rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 849
 850         ret = nvm_submit_io_sync_raw(dev, &rqd);
 851         if (ret)
 852                 return ret;
 853
 854         __free_page(page);
 855
 856         return rqd.error;
 857 }
 858
 859 /*
 860  * Scans a 1.2 chunk first and last page to determine if its state.
 861  * If the chunk is found to be open, also scan it to update the write
 862  * pointer.
 863  */
 864 static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
 865                              struct nvm_chk_meta *meta)
 866 {
 867         struct nvm_geo *geo = &dev->geo;
 868         int ret, pg, pl;
 869
 870         /* sense first page */
 871         ret = nvm_bb_chunk_sense(dev, ppa);
 872         if (ret < 0) /* io error */
 873                 return ret;
 874         else if (ret == 0) /* valid data */
 875                 meta->state = NVM_CHK_ST_OPEN;
 876         else if (ret > 0) {
 877                 /*
 878                  * If empty page, the chunk is free, else it is an
 879                  * actual io error. In that case, mark it offline.
 880                  */
 881                 switch (ret) {
 882                 case NVM_RSP_ERR_EMPTYPAGE:
 883                         meta->state = NVM_CHK_ST_FREE;
 884                         return 0;
 885                 case NVM_RSP_ERR_FAILCRC:
 886                 case NVM_RSP_ERR_FAILECC:
 887                 case NVM_RSP_WARN_HIGHECC:
 888                         meta->state = NVM_CHK_ST_OPEN;
 889                         goto scan;
 890                 default:
 891                         return -ret; /* other io error */
 892                 }
 893         }
 894
 895         /* sense last page */
 896         ppa.g.pg = geo->num_pg - 1;
 897         ppa.g.pl = geo->num_pln - 1;
 898
 899         ret = nvm_bb_chunk_sense(dev, ppa);
 900         if (ret < 0) /* io error */
 901                 return ret;
 902         else if (ret == 0) { /* Chunk fully written */
 903                 meta->state = NVM_CHK_ST_CLOSED;
 904                 meta->wp = geo->clba;
 905                 return 0;
 906         } else if (ret > 0) {
 907                 switch (ret) {
 908                 case NVM_RSP_ERR_EMPTYPAGE:
 909                 case NVM_RSP_ERR_FAILCRC:
 910                 case NVM_RSP_ERR_FAILECC:
 911                 case NVM_RSP_WARN_HIGHECC:
 912                         meta->state = NVM_CHK_ST_OPEN;
 913                         break;
 914                 default:
 915                         return -ret; /* other io error */
 916                 }
 917         }
 918
 919 scan:
 920         /*
 921          * chunk is open, we scan sequentially to update the write pointer.
 922          * We make the assumption that targets write data across all planes
 923          * before moving to the next page.
 924          */
 925         for (pg = 0; pg < geo->num_pg; pg++) {
 926                 for (pl = 0; pl < geo->num_pln; pl++) {
 927                         ppa.g.pg = pg;
 928                         ppa.g.pl = pl;
 929
 930                         ret = nvm_bb_chunk_sense(dev, ppa);
 931                         if (ret < 0) /* io error */
 932                                 return ret;
 933                         else if (ret == 0) {
 934                                 meta->wp += geo->ws_min;
 935                         } else if (ret > 0) {
 936                                 switch (ret) {
 937                                 case NVM_RSP_ERR_EMPTYPAGE:
 938                                         return 0;
 939                                 case NVM_RSP_ERR_FAILCRC:
 940                                 case NVM_RSP_ERR_FAILECC:
 941                                 case NVM_RSP_WARN_HIGHECC:
 942                                         meta->wp += geo->ws_min;
 943                                         break;
 944                                 default:
 945                                         return -ret; /* other io error */
 946                                 }
 947                         }
 948                 }
 949         }
 950
 951         return 0;
 952 }
 953
 954 /*
 955  * folds a bad block list from its plane representation to its
 956  * chunk representation.
 957  *
 958  * If any of the planes status are bad or grown bad, the chunk is marked
 959  * offline. If not bad, the first plane state acts as the chunk state.
 960  */
 961 static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
 962                            u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
 963 {
 964         struct nvm_geo *geo = &dev->geo;
 965         int ret, blk, pl, offset, blktype;
 966
 967         for (blk = 0; blk < geo->num_chk; blk++) {
 968                 offset = blk * geo->pln_mode;
 969                 blktype = blks[offset];
 970
 971                 for (pl = 0; pl < geo->pln_mode; pl++) {
 972                         if (blks[offset + pl] &
 973                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 974                                 blktype = blks[offset + pl];
 975                                 break;
 976                         }
 977                 }
 978
 979                 ppa.g.blk = blk;
 980
 981                 meta->wp = 0;
 982                 meta->type = NVM_CHK_TP_W_SEQ;
 983                 meta->wi = 0;
 984                 meta->slba = generic_to_dev_addr(dev, ppa).ppa;
 985                 meta->cnlb = dev->geo.clba;
 986
 987                 if (blktype == NVM_BLK_T_FREE) {
 988                         ret = nvm_bb_chunk_scan(dev, ppa, meta);
 989                         if (ret)
 990                                 return ret;
 991                 } else {
 992                         meta->state = NVM_CHK_ST_OFFLINE;
 993                 }
 994
 995                 meta++;
 996         }
 997
 998         return 0;
 999 }
1000
1001 static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
1002                            int nchks, struct nvm_chk_meta *meta)
1003 {
1004         struct nvm_geo *geo = &dev->geo;
1005         struct ppa_addr ppa;
1006         u8 *blks;
1007         int ch, lun, nr_blks;
1008         int ret = 0;
1009
1010         ppa.ppa = slba;
1011         ppa = dev_to_generic_addr(dev, ppa);
1012
1013         if (ppa.g.blk != 0)
1014                 return -EINVAL;
1015
1016         if ((nchks % geo->num_chk) != 0)
1017                 return -EINVAL;
1018
1019         nr_blks = geo->num_chk * geo->pln_mode;
1020
1021         blks = kmalloc(nr_blks, GFP_KERNEL);
1022         if (!blks)
1023                 return -ENOMEM;
1024
1025         for (ch = ppa.g.ch; ch < geo->num_ch; ch++) {
1026                 for (lun = ppa.g.lun; lun < geo->num_lun; lun++) {
1027                         struct ppa_addr ppa_gen, ppa_dev;
1028
1029                         if (!nchks)
1030                                 goto done;
1031
1032                         ppa_gen.ppa = 0;
1033                         ppa_gen.g.ch = ch;
1034                         ppa_gen.g.lun = lun;
1035                         ppa_dev = generic_to_dev_addr(dev, ppa_gen);
1036
1037                         ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks);
1038                         if (ret)
1039                                 goto done;
1040
1041                         ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks,
1042                                                                         meta);
1043                         if (ret)
1044                                 goto done;
1045
1046                         meta += geo->num_chk;
1047                         nchks -= geo->num_chk;
1048                 }
1049         }
1050 done:
1051         kfree(blks);
1052         return ret;
1053 }
1054
1055 int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
1056                        int nchks, struct nvm_chk_meta *meta)
1057 {
1058         struct nvm_dev *dev = tgt_dev->parent;
1059
1060         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
1061
1062         if (dev->geo.version == NVM_OCSSD_SPEC_12)
1063                 return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1064
1065         return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1066 }
1067 EXPORT_SYMBOL_GPL(nvm_get_chunk_meta);
1068
1069 int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
1070                        int nr_ppas, int type)
1071 {
1072         struct nvm_dev *dev = tgt_dev->parent;
1073         struct nvm_rq rqd;
1074         int ret;
1075
1076         if (dev->geo.version == NVM_OCSSD_SPEC_20)
1077                 return 0;
1078
1079         if (nr_ppas > NVM_MAX_VLBA) {
1080                 pr_err("unable to update all blocks atomically\n");
1081                 return -EINVAL;
1082         }
1083
1084         memset(&rqd, 0, sizeof(struct nvm_rq));
1085
1086         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
1087         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
1088
1089         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
1090         nvm_free_rqd_ppalist(tgt_dev, &rqd);
1091         if (ret)
1092                 return -EINVAL;
1093
1094         return 0;
1095 }
1096 EXPORT_SYMBOL_GPL(nvm_set_chunk_meta);
1097
1098 static int nvm_core_init(struct nvm_dev *dev)
1099 {
1100         struct nvm_geo *geo = &dev->geo;
1101         int ret;
1102
1103         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
1104                                         sizeof(unsigned long), GFP_KERNEL);
1105         if (!dev->lun_map)
1106                 return -ENOMEM;
1107
1108         INIT_LIST_HEAD(&dev->area_list);
1109         INIT_LIST_HEAD(&dev->targets);
1110         mutex_init(&dev->mlock);
1111         spin_lock_init(&dev->lock);
1112
1113         ret = nvm_register_map(dev);
1114         if (ret)
1115                 goto err_fmtype;
1116
1117         return 0;
1118 err_fmtype:
1119         kfree(dev->lun_map);
1120         return ret;
1121 }
1122
1123 static void nvm_free(struct kref *ref)
1124 {
1125         struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref);
1126
1127         if (dev->dma_pool)
1128                 dev->ops->destroy_dma_pool(dev->dma_pool);
1129
1130         if (dev->rmap)
1131                 nvm_unregister_map(dev);
1132
1133         kfree(dev->lun_map);
1134         kfree(dev);
1135 }
1136
1137 static int nvm_init(struct nvm_dev *dev)
1138 {
1139         struct nvm_geo *geo = &dev->geo;
1140         int ret = -EINVAL;
1141
1142         if (dev->ops->identity(dev)) {
1143                 pr_err("device could not be identified\n");
1144                 goto err;
1145         }
1146
1147         pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id,
1148                         geo->minor_ver_id, geo->vmnt);
1149
1150         ret = nvm_core_init(dev);
1151         if (ret) {
1152                 pr_err("could not initialize core structures.\n");
1153                 goto err;
1154         }
1155
1156         pr_info("registered %s [%u/%u/%u/%u/%u]\n",
1157                         dev->name, dev->geo.ws_min, dev->geo.ws_opt,
1158                         dev->geo.num_chk, dev->geo.all_luns,
1159                         dev->geo.num_ch);
1160         return 0;
1161 err:
1162         pr_err("failed to initialize nvm\n");
1163         return ret;
1164 }
1165
1166 struct nvm_dev *nvm_alloc_dev(int node)
1167 {
1168         struct nvm_dev *dev;
1169
1170         dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1171         if (dev)
1172                 kref_init(&dev->ref);
1173
1174         return dev;
1175 }
1176 EXPORT_SYMBOL(nvm_alloc_dev);
1177
1178 int nvm_register(struct nvm_dev *dev)
1179 {
1180         int ret, exp_pool_size;
1181
1182         if (!dev->q || !dev->ops) {
1183                 kref_put(&dev->ref, nvm_free);
1184                 return -EINVAL;
1185         }
1186
1187         ret = nvm_init(dev);
1188         if (ret) {
1189                 kref_put(&dev->ref, nvm_free);
1190                 return ret;
1191         }
1192
1193         exp_pool_size = max_t(int, PAGE_SIZE,
1194                               (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
1195         exp_pool_size = round_up(exp_pool_size, PAGE_SIZE);
1196
1197         dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist",
1198                                                   exp_pool_size);
1199         if (!dev->dma_pool) {
1200                 pr_err("could not create dma pool\n");
1201                 kref_put(&dev->ref, nvm_free);
1202                 return -ENOMEM;
1203         }
1204
1205         /* register device with a supported media manager */
1206         down_write(&nvm_lock);
1207         list_add(&dev->devices, &nvm_devices);
1208         up_write(&nvm_lock);
1209
1210         return 0;
1211 }
1212 EXPORT_SYMBOL(nvm_register);
1213
1214 void nvm_unregister(struct nvm_dev *dev)
1215 {
1216         struct nvm_target *t, *tmp;
1217
1218         mutex_lock(&dev->mlock);
1219         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1220                 if (t->dev->parent != dev)
1221                         continue;
1222                 __nvm_remove_target(t, false);
1223                 kref_put(&dev->ref, nvm_free);
1224         }
1225         mutex_unlock(&dev->mlock);
1226
1227         down_write(&nvm_lock);
1228         list_del(&dev->devices);
1229         up_write(&nvm_lock);
1230
1231         kref_put(&dev->ref, nvm_free);
1232 }
1233 EXPORT_SYMBOL(nvm_unregister);
1234
1235 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1236 {
1237         struct nvm_dev *dev;
1238         int ret;
1239
1240         down_write(&nvm_lock);
1241         dev = nvm_find_nvm_dev(create->dev);
1242         up_write(&nvm_lock);
1243
1244         if (!dev) {
1245                 pr_err("device not found\n");
1246                 return -EINVAL;
1247         }
1248
1249         kref_get(&dev->ref);
1250         ret = nvm_create_tgt(dev, create);
1251         if (ret)
1252                 kref_put(&dev->ref, nvm_free);
1253
1254         return ret;
1255 }
1256
1257 static long nvm_ioctl_info(struct file *file, void __user *arg)
1258 {
1259         struct nvm_ioctl_info *info;
1260         struct nvm_tgt_type *tt;
1261         int tgt_iter = 0;
1262
1263         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1264         if (IS_ERR(info))
1265                 return -EFAULT;
1266
1267         info->version[0] = NVM_VERSION_MAJOR;
1268         info->version[1] = NVM_VERSION_MINOR;
1269         info->version[2] = NVM_VERSION_PATCH;
1270
1271         down_write(&nvm_tgtt_lock);
1272         list_for_each_entry(tt, &nvm_tgt_types, list) {
1273                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1274
1275                 tgt->version[0] = tt->version[0];
1276                 tgt->version[1] = tt->version[1];
1277                 tgt->version[2] = tt->version[2];
1278                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1279
1280                 tgt_iter++;
1281         }
1282
1283         info->tgtsize = tgt_iter;
1284         up_write(&nvm_tgtt_lock);
1285
1286         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1287                 kfree(info);
1288                 return -EFAULT;
1289         }
1290
1291         kfree(info);
1292         return 0;
1293 }
1294
1295 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1296 {
1297         struct nvm_ioctl_get_devices *devices;
1298         struct nvm_dev *dev;
1299         int i = 0;
1300
1301         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1302         if (!devices)
1303                 return -ENOMEM;
1304
1305         down_write(&nvm_lock);
1306         list_for_each_entry(dev, &nvm_devices, devices) {
1307                 struct nvm_ioctl_device_info *info = &devices->info[i];
1308
1309                 strlcpy(info->devname, dev->name, sizeof(info->devname));
1310
1311                 /* kept for compatibility */
1312                 info->bmversion[0] = 1;
1313                 info->bmversion[1] = 0;
1314                 info->bmversion[2] = 0;
1315                 strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
1316                 i++;
1317
1318                 if (i > 31) {
1319                         pr_err("max 31 devices can be reported.\n");
1320                         break;
1321                 }
1322         }
1323         up_write(&nvm_lock);
1324
1325         devices->nr_devices = i;
1326
1327         if (copy_to_user(arg, devices,
1328                          sizeof(struct nvm_ioctl_get_devices))) {
1329                 kfree(devices);
1330                 return -EFAULT;
1331         }
1332
1333         kfree(devices);
1334         return 0;
1335 }
1336
1337 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1338 {
1339         struct nvm_ioctl_create create;
1340
1341         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1342                 return -EFAULT;
1343
1344         if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
1345             create.conf.e.rsv != 0) {
1346                 pr_err("reserved config field in use\n");
1347                 return -EINVAL;
1348         }
1349
1350         create.dev[DISK_NAME_LEN - 1] = '\0';
1351         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1352         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1353
1354         if (create.flags != 0) {
1355                 __u32 flags = create.flags;
1356
1357                 /* Check for valid flags */
1358                 if (flags & NVM_TARGET_FACTORY)
1359                         flags &= ~NVM_TARGET_FACTORY;
1360
1361                 if (flags) {
1362                         pr_err("flag not supported\n");
1363                         return -EINVAL;
1364                 }
1365         }
1366
1367         return __nvm_configure_create(&create);
1368 }
1369
1370 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1371 {
1372         struct nvm_ioctl_remove remove;
1373
1374         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1375                 return -EFAULT;
1376
1377         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1378
1379         if (remove.flags != 0) {
1380                 pr_err("no flags supported\n");
1381                 return -EINVAL;
1382         }
1383
1384         return nvm_remove_tgt(&remove);
1385 }
1386
1387 /* kept for compatibility reasons */
1388 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1389 {
1390         struct nvm_ioctl_dev_init init;
1391
1392         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1393                 return -EFAULT;
1394
1395         if (init.flags != 0) {
1396                 pr_err("no flags supported\n");
1397                 return -EINVAL;
1398         }
1399
1400         return 0;
1401 }
1402
1403 /* Kept for compatibility reasons */
1404 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1405 {
1406         struct nvm_ioctl_dev_factory fact;
1407
1408         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1409                 return -EFAULT;
1410
1411         fact.dev[DISK_NAME_LEN - 1] = '\0';
1412
1413         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1414                 return -EINVAL;
1415
1416         return 0;
1417 }
1418
1419 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1420 {
1421         void __user *argp = (void __user *)arg;
1422
1423         if (!capable(CAP_SYS_ADMIN))
1424                 return -EPERM;
1425
1426         switch (cmd) {
1427         case NVM_INFO:
1428                 return nvm_ioctl_info(file, argp);
1429         case NVM_GET_DEVICES:
1430                 return nvm_ioctl_get_devices(file, argp);
1431         case NVM_DEV_CREATE:
1432                 return nvm_ioctl_dev_create(file, argp);
1433         case NVM_DEV_REMOVE:
1434                 return nvm_ioctl_dev_remove(file, argp);
1435         case NVM_DEV_INIT:
1436                 return nvm_ioctl_dev_init(file, argp);
1437         case NVM_DEV_FACTORY:
1438                 return nvm_ioctl_dev_factory(file, argp);
1439         }
1440         return 0;
1441 }
1442
1443 static const struct file_operations _ctl_fops = {
1444         .open = nonseekable_open,
1445         .unlocked_ioctl = nvm_ctl_ioctl,
1446         .owner = THIS_MODULE,
1447         .llseek  = noop_llseek,
1448 };
1449
1450 static struct miscdevice _nvm_misc = {
1451         .minor          = MISC_DYNAMIC_MINOR,
1452         .name           = "lightnvm",
1453         .nodename       = "lightnvm/control",
1454         .fops           = &_ctl_fops,
1455 };
1456 builtin_misc_device(_nvm_misc);