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_node(GFP_KERNEL, dev->q->node);
 384         if (!tqueue) {
 385                 ret = -ENOMEM;
 386                 goto err_disk;
 387         }
 388         blk_queue_make_request(tqueue, tt->make_rq);
 389
 390         strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 391         tdisk->flags = GENHD_FL_EXT_DEVT;
 392         tdisk->major = 0;
 393         tdisk->first_minor = 0;
 394         tdisk->fops = &nvm_fops;
 395         tdisk->queue = tqueue;
 396
 397         targetdata = tt->init(tgt_dev, tdisk, create->flags);
 398         if (IS_ERR(targetdata)) {
 399                 ret = PTR_ERR(targetdata);
 400                 goto err_init;
 401         }
 402
 403         tdisk->private_data = targetdata;
 404         tqueue->queuedata = targetdata;
 405
 406         mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
 407         if (dev->geo.mdts) {
 408                 mdts = min_t(u32, dev->geo.mdts,
 409                                 (dev->geo.csecs >> 9) * NVM_MAX_VLBA);
 410         }
 411         blk_queue_max_hw_sectors(tqueue, mdts);
 412
 413         set_capacity(tdisk, tt->capacity(targetdata));
 414         add_disk(tdisk);
 415
 416         if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
 417                 ret = -ENOMEM;
 418                 goto err_sysfs;
 419         }
 420
 421         t->type = tt;
 422         t->disk = tdisk;
 423         t->dev = tgt_dev;
 424
 425         mutex_lock(&dev->mlock);
 426         list_add_tail(&t->list, &dev->targets);
 427         mutex_unlock(&dev->mlock);
 428
 429         __module_get(tt->owner);
 430
 431         return 0;
 432 err_sysfs:
 433         if (tt->exit)
 434                 tt->exit(targetdata, true);
 435 err_init:
 436         blk_cleanup_queue(tqueue);
 437         tdisk->queue = NULL;
 438 err_disk:
 439         put_disk(tdisk);
 440 err_dev:
 441         nvm_remove_tgt_dev(tgt_dev, 0);
 442 err_t:
 443         kfree(t);
 444 err_reserve:
 445         nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
 446         return ret;
 447 }
 448
 449 static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 450 {
 451         struct nvm_tgt_type *tt = t->type;
 452         struct gendisk *tdisk = t->disk;
 453         struct request_queue *q = tdisk->queue;
 454
 455         del_gendisk(tdisk);
 456         blk_cleanup_queue(q);
 457
 458         if (tt->sysfs_exit)
 459                 tt->sysfs_exit(tdisk);
 460
 461         if (tt->exit)
 462                 tt->exit(tdisk->private_data, graceful);
 463
 464         nvm_remove_tgt_dev(t->dev, 1);
 465         put_disk(tdisk);
 466         module_put(t->type->owner);
 467
 468         list_del(&t->list);
 469         kfree(t);
 470 }
 471
 472 /**
 473  * nvm_remove_tgt - Removes a target from the media manager
 474  * @remove:     ioctl structure with target name to remove.
 475  *
 476  * Returns:
 477  * 0: on success
 478  * 1: on not found
 479  * <0: on error
 480  */
 481 static int nvm_remove_tgt(struct nvm_ioctl_remove *remove)
 482 {
 483         struct nvm_target *t = NULL;
 484         struct nvm_dev *dev;
 485
 486         down_read(&nvm_lock);
 487         list_for_each_entry(dev, &nvm_devices, devices) {
 488                 mutex_lock(&dev->mlock);
 489                 t = nvm_find_target(dev, remove->tgtname);
 490                 if (t) {
 491                         mutex_unlock(&dev->mlock);
 492                         break;
 493                 }
 494                 mutex_unlock(&dev->mlock);
 495         }
 496         up_read(&nvm_lock);
 497
 498         if (!t) {
 499                 pr_err("failed to remove target %s\n",
 500                                 remove->tgtname);
 501                 return 1;
 502         }
 503
 504         __nvm_remove_target(t, true);
 505         kref_put(&dev->ref, nvm_free);
 506
 507         return 0;
 508 }
 509
 510 static int nvm_register_map(struct nvm_dev *dev)
 511 {
 512         struct nvm_dev_map *rmap;
 513         int i, j;
 514
 515         rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
 516         if (!rmap)
 517                 goto err_rmap;
 518
 519         rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map),
 520                                                                 GFP_KERNEL);
 521         if (!rmap->chnls)
 522                 goto err_chnls;
 523
 524         for (i = 0; i < dev->geo.num_ch; i++) {
 525                 struct nvm_ch_map *ch_rmap;
 526                 int *lun_roffs;
 527                 int luns_in_chnl = dev->geo.num_lun;
 528
 529                 ch_rmap = &rmap->chnls[i];
 530
 531                 ch_rmap->ch_off = -1;
 532                 ch_rmap->num_lun = luns_in_chnl;
 533
 534                 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
 535                 if (!lun_roffs)
 536                         goto err_ch;
 537
 538                 for (j = 0; j < luns_in_chnl; j++)
 539                         lun_roffs[j] = -1;
 540
 541                 ch_rmap->lun_offs = lun_roffs;
 542         }
 543
 544         dev->rmap = rmap;
 545
 546         return 0;
 547 err_ch:
 548         while (--i >= 0)
 549                 kfree(rmap->chnls[i].lun_offs);
 550 err_chnls:
 551         kfree(rmap);
 552 err_rmap:
 553         return -ENOMEM;
 554 }
 555
 556 static void nvm_unregister_map(struct nvm_dev *dev)
 557 {
 558         struct nvm_dev_map *rmap = dev->rmap;
 559         int i;
 560
 561         for (i = 0; i < dev->geo.num_ch; i++)
 562                 kfree(rmap->chnls[i].lun_offs);
 563
 564         kfree(rmap->chnls);
 565         kfree(rmap);
 566 }
 567
 568 static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 569 {
 570         struct nvm_dev_map *dev_map = tgt_dev->map;
 571         struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch];
 572         int lun_off = ch_map->lun_offs[p->a.lun];
 573
 574         p->a.ch += ch_map->ch_off;
 575         p->a.lun += lun_off;
 576 }
 577
 578 static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
 579 {
 580         struct nvm_dev *dev = tgt_dev->parent;
 581         struct nvm_dev_map *dev_rmap = dev->rmap;
 582         struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch];
 583         int lun_roff = ch_rmap->lun_offs[p->a.lun];
 584
 585         p->a.ch -= ch_rmap->ch_off;
 586         p->a.lun -= lun_roff;
 587 }
 588
 589 static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
 590                                 struct ppa_addr *ppa_list, int nr_ppas)
 591 {
 592         int i;
 593
 594         for (i = 0; i < nr_ppas; i++) {
 595                 nvm_map_to_dev(tgt_dev, &ppa_list[i]);
 596                 ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]);
 597         }
 598 }
 599
 600 static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
 601                                 struct ppa_addr *ppa_list, int nr_ppas)
 602 {
 603         int i;
 604
 605         for (i = 0; i < nr_ppas; i++) {
 606                 ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]);
 607                 nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
 608         }
 609 }
 610
 611 static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 612 {
 613         struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
 614
 615         nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas);
 616 }
 617
 618 static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
 619 {
 620         struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
 621
 622         nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas);
 623 }
 624
 625 int nvm_register_tgt_type(struct nvm_tgt_type *tt)
 626 {
 627         int ret = 0;
 628
 629         down_write(&nvm_tgtt_lock);
 630         if (__nvm_find_target_type(tt->name))
 631                 ret = -EEXIST;
 632         else
 633                 list_add(&tt->list, &nvm_tgt_types);
 634         up_write(&nvm_tgtt_lock);
 635
 636         return ret;
 637 }
 638 EXPORT_SYMBOL(nvm_register_tgt_type);
 639
 640 void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
 641 {
 642         if (!tt)
 643                 return;
 644
 645         down_write(&nvm_tgtt_lock);
 646         list_del(&tt->list);
 647         up_write(&nvm_tgtt_lock);
 648 }
 649 EXPORT_SYMBOL(nvm_unregister_tgt_type);
 650
 651 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
 652                                                         dma_addr_t *dma_handler)
 653 {
 654         return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
 655                                                                 dma_handler);
 656 }
 657 EXPORT_SYMBOL(nvm_dev_dma_alloc);
 658
 659 void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
 660 {
 661         dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
 662 }
 663 EXPORT_SYMBOL(nvm_dev_dma_free);
 664
 665 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 666 {
 667         struct nvm_dev *dev;
 668
 669         list_for_each_entry(dev, &nvm_devices, devices)
 670                 if (!strcmp(name, dev->name))
 671                         return dev;
 672
 673         return NULL;
 674 }
 675
 676 static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 677                         const struct ppa_addr *ppas, int nr_ppas)
 678 {
 679         struct nvm_dev *dev = tgt_dev->parent;
 680         struct nvm_geo *geo = &tgt_dev->geo;
 681         int i, plane_cnt, pl_idx;
 682         struct ppa_addr ppa;
 683
 684         if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
 685                 rqd->nr_ppas = nr_ppas;
 686                 rqd->ppa_addr = ppas[0];
 687
 688                 return 0;
 689         }
 690
 691         rqd->nr_ppas = nr_ppas;
 692         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 693         if (!rqd->ppa_list) {
 694                 pr_err("failed to allocate dma memory\n");
 695                 return -ENOMEM;
 696         }
 697
 698         plane_cnt = geo->pln_mode;
 699         rqd->nr_ppas *= plane_cnt;
 700
 701         for (i = 0; i < nr_ppas; i++) {
 702                 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 703                         ppa = ppas[i];
 704                         ppa.g.pl = pl_idx;
 705                         rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
 706                 }
 707         }
 708
 709         return 0;
 710 }
 711
 712 static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
 713                         struct nvm_rq *rqd)
 714 {
 715         if (!rqd->ppa_list)
 716                 return;
 717
 718         nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
 719 }
 720
 721 static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
 722 {
 723         int flags = 0;
 724
 725         if (geo->version == NVM_OCSSD_SPEC_20)
 726                 return 0;
 727
 728         if (rqd->is_seq)
 729                 flags |= geo->pln_mode >> 1;
 730
 731         if (rqd->opcode == NVM_OP_PREAD)
 732                 flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND);
 733         else if (rqd->opcode == NVM_OP_PWRITE)
 734                 flags |= NVM_IO_SCRAMBLE_ENABLE;
 735
 736         return flags;
 737 }
 738
 739 int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf)
 740 {
 741         struct nvm_dev *dev = tgt_dev->parent;
 742         int ret;
 743
 744         if (!dev->ops->submit_io)
 745                 return -ENODEV;
 746
 747         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 748
 749         rqd->dev = tgt_dev;
 750         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 751
 752         /* In case of error, fail with right address format */
 753         ret = dev->ops->submit_io(dev, rqd, buf);
 754         if (ret)
 755                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 756         return ret;
 757 }
 758 EXPORT_SYMBOL(nvm_submit_io);
 759
 760 static void nvm_sync_end_io(struct nvm_rq *rqd)
 761 {
 762         struct completion *waiting = rqd->private;
 763
 764         complete(waiting);
 765 }
 766
 767 static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
 768                               void *buf)
 769 {
 770         DECLARE_COMPLETION_ONSTACK(wait);
 771         int ret = 0;
 772
 773         rqd->end_io = nvm_sync_end_io;
 774         rqd->private = &wait;
 775
 776         ret = dev->ops->submit_io(dev, rqd, buf);
 777         if (ret)
 778                 return ret;
 779
 780         wait_for_completion_io(&wait);
 781
 782         return 0;
 783 }
 784
 785 int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
 786                        void *buf)
 787 {
 788         struct nvm_dev *dev = tgt_dev->parent;
 789         int ret;
 790
 791         if (!dev->ops->submit_io)
 792                 return -ENODEV;
 793
 794         nvm_rq_tgt_to_dev(tgt_dev, rqd);
 795
 796         rqd->dev = tgt_dev;
 797         rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
 798
 799         ret = nvm_submit_io_wait(dev, rqd, buf);
 800
 801         return ret;
 802 }
 803 EXPORT_SYMBOL(nvm_submit_io_sync);
 804
 805 void nvm_end_io(struct nvm_rq *rqd)
 806 {
 807         struct nvm_tgt_dev *tgt_dev = rqd->dev;
 808
 809         /* Convert address space */
 810         if (tgt_dev)
 811                 nvm_rq_dev_to_tgt(tgt_dev, rqd);
 812
 813         if (rqd->end_io)
 814                 rqd->end_io(rqd);
 815 }
 816 EXPORT_SYMBOL(nvm_end_io);
 817
 818 static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
 819 {
 820         if (!dev->ops->submit_io)
 821                 return -ENODEV;
 822
 823         rqd->dev = NULL;
 824         rqd->flags = nvm_set_flags(&dev->geo, rqd);
 825
 826         return nvm_submit_io_wait(dev, rqd, NULL);
 827 }
 828
 829 static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
 830 {
 831         struct nvm_rq rqd = { NULL };
 832         struct bio bio;
 833         struct bio_vec bio_vec;
 834         struct page *page;
 835         int ret;
 836
 837         page = alloc_page(GFP_KERNEL);
 838         if (!page)
 839                 return -ENOMEM;
 840
 841         bio_init(&bio, &bio_vec, 1);
 842         bio_add_page(&bio, page, PAGE_SIZE, 0);
 843         bio_set_op_attrs(&bio, REQ_OP_READ, 0);
 844
 845         rqd.bio = &bio;
 846         rqd.opcode = NVM_OP_PREAD;
 847         rqd.is_seq = 1;
 848         rqd.nr_ppas = 1;
 849         rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 850
 851         ret = nvm_submit_io_sync_raw(dev, &rqd);
 852         if (ret)
 853                 return ret;
 854
 855         __free_page(page);
 856
 857         return rqd.error;
 858 }
 859
 860 /*
 861  * Scans a 1.2 chunk first and last page to determine if its state.
 862  * If the chunk is found to be open, also scan it to update the write
 863  * pointer.
 864  */
 865 static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
 866                              struct nvm_chk_meta *meta)
 867 {
 868         struct nvm_geo *geo = &dev->geo;
 869         int ret, pg, pl;
 870
 871         /* sense first page */
 872         ret = nvm_bb_chunk_sense(dev, ppa);
 873         if (ret < 0) /* io error */
 874                 return ret;
 875         else if (ret == 0) /* valid data */
 876                 meta->state = NVM_CHK_ST_OPEN;
 877         else if (ret > 0) {
 878                 /*
 879                  * If empty page, the chunk is free, else it is an
 880                  * actual io error. In that case, mark it offline.
 881                  */
 882                 switch (ret) {
 883                 case NVM_RSP_ERR_EMPTYPAGE:
 884                         meta->state = NVM_CHK_ST_FREE;
 885                         return 0;
 886                 case NVM_RSP_ERR_FAILCRC:
 887                 case NVM_RSP_ERR_FAILECC:
 888                 case NVM_RSP_WARN_HIGHECC:
 889                         meta->state = NVM_CHK_ST_OPEN;
 890                         goto scan;
 891                 default:
 892                         return -ret; /* other io error */
 893                 }
 894         }
 895
 896         /* sense last page */
 897         ppa.g.pg = geo->num_pg - 1;
 898         ppa.g.pl = geo->num_pln - 1;
 899
 900         ret = nvm_bb_chunk_sense(dev, ppa);
 901         if (ret < 0) /* io error */
 902                 return ret;
 903         else if (ret == 0) { /* Chunk fully written */
 904                 meta->state = NVM_CHK_ST_CLOSED;
 905                 meta->wp = geo->clba;
 906                 return 0;
 907         } else if (ret > 0) {
 908                 switch (ret) {
 909                 case NVM_RSP_ERR_EMPTYPAGE:
 910                 case NVM_RSP_ERR_FAILCRC:
 911                 case NVM_RSP_ERR_FAILECC:
 912                 case NVM_RSP_WARN_HIGHECC:
 913                         meta->state = NVM_CHK_ST_OPEN;
 914                         break;
 915                 default:
 916                         return -ret; /* other io error */
 917                 }
 918         }
 919
 920 scan:
 921         /*
 922          * chunk is open, we scan sequentially to update the write pointer.
 923          * We make the assumption that targets write data across all planes
 924          * before moving to the next page.
 925          */
 926         for (pg = 0; pg < geo->num_pg; pg++) {
 927                 for (pl = 0; pl < geo->num_pln; pl++) {
 928                         ppa.g.pg = pg;
 929                         ppa.g.pl = pl;
 930
 931                         ret = nvm_bb_chunk_sense(dev, ppa);
 932                         if (ret < 0) /* io error */
 933                                 return ret;
 934                         else if (ret == 0) {
 935                                 meta->wp += geo->ws_min;
 936                         } else if (ret > 0) {
 937                                 switch (ret) {
 938                                 case NVM_RSP_ERR_EMPTYPAGE:
 939                                         return 0;
 940                                 case NVM_RSP_ERR_FAILCRC:
 941                                 case NVM_RSP_ERR_FAILECC:
 942                                 case NVM_RSP_WARN_HIGHECC:
 943                                         meta->wp += geo->ws_min;
 944                                         break;
 945                                 default:
 946                                         return -ret; /* other io error */
 947                                 }
 948                         }
 949                 }
 950         }
 951
 952         return 0;
 953 }
 954
 955 /*
 956  * folds a bad block list from its plane representation to its
 957  * chunk representation.
 958  *
 959  * If any of the planes status are bad or grown bad, the chunk is marked
 960  * offline. If not bad, the first plane state acts as the chunk state.
 961  */
 962 static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
 963                            u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
 964 {
 965         struct nvm_geo *geo = &dev->geo;
 966         int ret, blk, pl, offset, blktype;
 967
 968         for (blk = 0; blk < geo->num_chk; blk++) {
 969                 offset = blk * geo->pln_mode;
 970                 blktype = blks[offset];
 971
 972                 for (pl = 0; pl < geo->pln_mode; pl++) {
 973                         if (blks[offset + pl] &
 974                                         (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
 975                                 blktype = blks[offset + pl];
 976                                 break;
 977                         }
 978                 }
 979
 980                 ppa.g.blk = blk;
 981
 982                 meta->wp = 0;
 983                 meta->type = NVM_CHK_TP_W_SEQ;
 984                 meta->wi = 0;
 985                 meta->slba = generic_to_dev_addr(dev, ppa).ppa;
 986                 meta->cnlb = dev->geo.clba;
 987
 988                 if (blktype == NVM_BLK_T_FREE) {
 989                         ret = nvm_bb_chunk_scan(dev, ppa, meta);
 990                         if (ret)
 991                                 return ret;
 992                 } else {
 993                         meta->state = NVM_CHK_ST_OFFLINE;
 994                 }
 995
 996                 meta++;
 997         }
 998
 999         return 0;
1000 }
1001
1002 static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
1003                            int nchks, struct nvm_chk_meta *meta)
1004 {
1005         struct nvm_geo *geo = &dev->geo;
1006         struct ppa_addr ppa;
1007         u8 *blks;
1008         int ch, lun, nr_blks;
1009         int ret = 0;
1010
1011         ppa.ppa = slba;
1012         ppa = dev_to_generic_addr(dev, ppa);
1013
1014         if (ppa.g.blk != 0)
1015                 return -EINVAL;
1016
1017         if ((nchks % geo->num_chk) != 0)
1018                 return -EINVAL;
1019
1020         nr_blks = geo->num_chk * geo->pln_mode;
1021
1022         blks = kmalloc(nr_blks, GFP_KERNEL);
1023         if (!blks)
1024                 return -ENOMEM;
1025
1026         for (ch = ppa.g.ch; ch < geo->num_ch; ch++) {
1027                 for (lun = ppa.g.lun; lun < geo->num_lun; lun++) {
1028                         struct ppa_addr ppa_gen, ppa_dev;
1029
1030                         if (!nchks)
1031                                 goto done;
1032
1033                         ppa_gen.ppa = 0;
1034                         ppa_gen.g.ch = ch;
1035                         ppa_gen.g.lun = lun;
1036                         ppa_dev = generic_to_dev_addr(dev, ppa_gen);
1037
1038                         ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks);
1039                         if (ret)
1040                                 goto done;
1041
1042                         ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks,
1043                                                                         meta);
1044                         if (ret)
1045                                 goto done;
1046
1047                         meta += geo->num_chk;
1048                         nchks -= geo->num_chk;
1049                 }
1050         }
1051 done:
1052         kfree(blks);
1053         return ret;
1054 }
1055
1056 int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
1057                        int nchks, struct nvm_chk_meta *meta)
1058 {
1059         struct nvm_dev *dev = tgt_dev->parent;
1060
1061         nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
1062
1063         if (dev->geo.version == NVM_OCSSD_SPEC_12)
1064                 return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1065
1066         return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta);
1067 }
1068 EXPORT_SYMBOL_GPL(nvm_get_chunk_meta);
1069
1070 int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
1071                        int nr_ppas, int type)
1072 {
1073         struct nvm_dev *dev = tgt_dev->parent;
1074         struct nvm_rq rqd;
1075         int ret;
1076
1077         if (dev->geo.version == NVM_OCSSD_SPEC_20)
1078                 return 0;
1079
1080         if (nr_ppas > NVM_MAX_VLBA) {
1081                 pr_err("unable to update all blocks atomically\n");
1082                 return -EINVAL;
1083         }
1084
1085         memset(&rqd, 0, sizeof(struct nvm_rq));
1086
1087         nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
1088         nvm_rq_tgt_to_dev(tgt_dev, &rqd);
1089
1090         ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
1091         nvm_free_rqd_ppalist(tgt_dev, &rqd);
1092         if (ret)
1093                 return -EINVAL;
1094
1095         return 0;
1096 }
1097 EXPORT_SYMBOL_GPL(nvm_set_chunk_meta);
1098
1099 static int nvm_core_init(struct nvm_dev *dev)
1100 {
1101         struct nvm_geo *geo = &dev->geo;
1102         int ret;
1103
1104         dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
1105                                         sizeof(unsigned long), GFP_KERNEL);
1106         if (!dev->lun_map)
1107                 return -ENOMEM;
1108
1109         INIT_LIST_HEAD(&dev->area_list);
1110         INIT_LIST_HEAD(&dev->targets);
1111         mutex_init(&dev->mlock);
1112         spin_lock_init(&dev->lock);
1113
1114         ret = nvm_register_map(dev);
1115         if (ret)
1116                 goto err_fmtype;
1117
1118         return 0;
1119 err_fmtype:
1120         kfree(dev->lun_map);
1121         return ret;
1122 }
1123
1124 static void nvm_free(struct kref *ref)
1125 {
1126         struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref);
1127
1128         if (dev->dma_pool)
1129                 dev->ops->destroy_dma_pool(dev->dma_pool);
1130
1131         if (dev->rmap)
1132                 nvm_unregister_map(dev);
1133
1134         kfree(dev->lun_map);
1135         kfree(dev);
1136 }
1137
1138 static int nvm_init(struct nvm_dev *dev)
1139 {
1140         struct nvm_geo *geo = &dev->geo;
1141         int ret = -EINVAL;
1142
1143         if (dev->ops->identity(dev)) {
1144                 pr_err("device could not be identified\n");
1145                 goto err;
1146         }
1147
1148         pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id,
1149                         geo->minor_ver_id, geo->vmnt);
1150
1151         ret = nvm_core_init(dev);
1152         if (ret) {
1153                 pr_err("could not initialize core structures.\n");
1154                 goto err;
1155         }
1156
1157         pr_info("registered %s [%u/%u/%u/%u/%u]\n",
1158                         dev->name, dev->geo.ws_min, dev->geo.ws_opt,
1159                         dev->geo.num_chk, dev->geo.all_luns,
1160                         dev->geo.num_ch);
1161         return 0;
1162 err:
1163         pr_err("failed to initialize nvm\n");
1164         return ret;
1165 }
1166
1167 struct nvm_dev *nvm_alloc_dev(int node)
1168 {
1169         struct nvm_dev *dev;
1170
1171         dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
1172         if (dev)
1173                 kref_init(&dev->ref);
1174
1175         return dev;
1176 }
1177 EXPORT_SYMBOL(nvm_alloc_dev);
1178
1179 int nvm_register(struct nvm_dev *dev)
1180 {
1181         int ret, exp_pool_size;
1182
1183         if (!dev->q || !dev->ops) {
1184                 kref_put(&dev->ref, nvm_free);
1185                 return -EINVAL;
1186         }
1187
1188         ret = nvm_init(dev);
1189         if (ret) {
1190                 kref_put(&dev->ref, nvm_free);
1191                 return ret;
1192         }
1193
1194         exp_pool_size = max_t(int, PAGE_SIZE,
1195                               (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
1196         exp_pool_size = round_up(exp_pool_size, PAGE_SIZE);
1197
1198         dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist",
1199                                                   exp_pool_size);
1200         if (!dev->dma_pool) {
1201                 pr_err("could not create dma pool\n");
1202                 kref_put(&dev->ref, nvm_free);
1203                 return -ENOMEM;
1204         }
1205
1206         /* register device with a supported media manager */
1207         down_write(&nvm_lock);
1208         list_add(&dev->devices, &nvm_devices);
1209         up_write(&nvm_lock);
1210
1211         return 0;
1212 }
1213 EXPORT_SYMBOL(nvm_register);
1214
1215 void nvm_unregister(struct nvm_dev *dev)
1216 {
1217         struct nvm_target *t, *tmp;
1218
1219         mutex_lock(&dev->mlock);
1220         list_for_each_entry_safe(t, tmp, &dev->targets, list) {
1221                 if (t->dev->parent != dev)
1222                         continue;
1223                 __nvm_remove_target(t, false);
1224                 kref_put(&dev->ref, nvm_free);
1225         }
1226         mutex_unlock(&dev->mlock);
1227
1228         down_write(&nvm_lock);
1229         list_del(&dev->devices);
1230         up_write(&nvm_lock);
1231
1232         kref_put(&dev->ref, nvm_free);
1233 }
1234 EXPORT_SYMBOL(nvm_unregister);
1235
1236 static int __nvm_configure_create(struct nvm_ioctl_create *create)
1237 {
1238         struct nvm_dev *dev;
1239         int ret;
1240
1241         down_write(&nvm_lock);
1242         dev = nvm_find_nvm_dev(create->dev);
1243         up_write(&nvm_lock);
1244
1245         if (!dev) {
1246                 pr_err("device not found\n");
1247                 return -EINVAL;
1248         }
1249
1250         kref_get(&dev->ref);
1251         ret = nvm_create_tgt(dev, create);
1252         if (ret)
1253                 kref_put(&dev->ref, nvm_free);
1254
1255         return ret;
1256 }
1257
1258 static long nvm_ioctl_info(struct file *file, void __user *arg)
1259 {
1260         struct nvm_ioctl_info *info;
1261         struct nvm_tgt_type *tt;
1262         int tgt_iter = 0;
1263
1264         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
1265         if (IS_ERR(info))
1266                 return -EFAULT;
1267
1268         info->version[0] = NVM_VERSION_MAJOR;
1269         info->version[1] = NVM_VERSION_MINOR;
1270         info->version[2] = NVM_VERSION_PATCH;
1271
1272         down_write(&nvm_tgtt_lock);
1273         list_for_each_entry(tt, &nvm_tgt_types, list) {
1274                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
1275
1276                 tgt->version[0] = tt->version[0];
1277                 tgt->version[1] = tt->version[1];
1278                 tgt->version[2] = tt->version[2];
1279                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
1280
1281                 tgt_iter++;
1282         }
1283
1284         info->tgtsize = tgt_iter;
1285         up_write(&nvm_tgtt_lock);
1286
1287         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
1288                 kfree(info);
1289                 return -EFAULT;
1290         }
1291
1292         kfree(info);
1293         return 0;
1294 }
1295
1296 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
1297 {
1298         struct nvm_ioctl_get_devices *devices;
1299         struct nvm_dev *dev;
1300         int i = 0;
1301
1302         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
1303         if (!devices)
1304                 return -ENOMEM;
1305
1306         down_write(&nvm_lock);
1307         list_for_each_entry(dev, &nvm_devices, devices) {
1308                 struct nvm_ioctl_device_info *info = &devices->info[i];
1309
1310                 strlcpy(info->devname, dev->name, sizeof(info->devname));
1311
1312                 /* kept for compatibility */
1313                 info->bmversion[0] = 1;
1314                 info->bmversion[1] = 0;
1315                 info->bmversion[2] = 0;
1316                 strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
1317                 i++;
1318
1319                 if (i > 31) {
1320                         pr_err("max 31 devices can be reported.\n");
1321                         break;
1322                 }
1323         }
1324         up_write(&nvm_lock);
1325
1326         devices->nr_devices = i;
1327
1328         if (copy_to_user(arg, devices,
1329                          sizeof(struct nvm_ioctl_get_devices))) {
1330                 kfree(devices);
1331                 return -EFAULT;
1332         }
1333
1334         kfree(devices);
1335         return 0;
1336 }
1337
1338 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
1339 {
1340         struct nvm_ioctl_create create;
1341
1342         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1343                 return -EFAULT;
1344
1345         if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
1346             create.conf.e.rsv != 0) {
1347                 pr_err("reserved config field in use\n");
1348                 return -EINVAL;
1349         }
1350
1351         create.dev[DISK_NAME_LEN - 1] = '\0';
1352         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1353         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1354
1355         if (create.flags != 0) {
1356                 __u32 flags = create.flags;
1357
1358                 /* Check for valid flags */
1359                 if (flags & NVM_TARGET_FACTORY)
1360                         flags &= ~NVM_TARGET_FACTORY;
1361
1362                 if (flags) {
1363                         pr_err("flag not supported\n");
1364                         return -EINVAL;
1365                 }
1366         }
1367
1368         return __nvm_configure_create(&create);
1369 }
1370
1371 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1372 {
1373         struct nvm_ioctl_remove remove;
1374
1375         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1376                 return -EFAULT;
1377
1378         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1379
1380         if (remove.flags != 0) {
1381                 pr_err("no flags supported\n");
1382                 return -EINVAL;
1383         }
1384
1385         return nvm_remove_tgt(&remove);
1386 }
1387
1388 /* kept for compatibility reasons */
1389 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1390 {
1391         struct nvm_ioctl_dev_init init;
1392
1393         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1394                 return -EFAULT;
1395
1396         if (init.flags != 0) {
1397                 pr_err("no flags supported\n");
1398                 return -EINVAL;
1399         }
1400
1401         return 0;
1402 }
1403
1404 /* Kept for compatibility reasons */
1405 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1406 {
1407         struct nvm_ioctl_dev_factory fact;
1408
1409         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1410                 return -EFAULT;
1411
1412         fact.dev[DISK_NAME_LEN - 1] = '\0';
1413
1414         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1415                 return -EINVAL;
1416
1417         return 0;
1418 }
1419
1420 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1421 {
1422         void __user *argp = (void __user *)arg;
1423
1424         if (!capable(CAP_SYS_ADMIN))
1425                 return -EPERM;
1426
1427         switch (cmd) {
1428         case NVM_INFO:
1429                 return nvm_ioctl_info(file, argp);
1430         case NVM_GET_DEVICES:
1431                 return nvm_ioctl_get_devices(file, argp);
1432         case NVM_DEV_CREATE:
1433                 return nvm_ioctl_dev_create(file, argp);
1434         case NVM_DEV_REMOVE:
1435                 return nvm_ioctl_dev_remove(file, argp);
1436         case NVM_DEV_INIT:
1437                 return nvm_ioctl_dev_init(file, argp);
1438         case NVM_DEV_FACTORY:
1439                 return nvm_ioctl_dev_factory(file, argp);
1440         }
1441         return 0;
1442 }
1443
1444 static const struct file_operations _ctl_fops = {
1445         .open = nonseekable_open,
1446         .unlocked_ioctl = nvm_ctl_ioctl,
1447         .owner = THIS_MODULE,
1448         .llseek  = noop_llseek,
1449 };
1450
1451 static struct miscdevice _nvm_misc = {
1452         .minor          = MISC_DYNAMIC_MINOR,
1453         .name           = "lightnvm",
1454         .nodename       = "lightnvm/control",
1455         .fops           = &_ctl_fops,
1456 };
1457 builtin_misc_device(_nvm_misc);