drivers/lightnvm/core.c

   1 /*
   2  * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
   3  * Initial release: Matias Bjorling <m@bjorling.me>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License version
   7  * 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; see the file COPYING.  If not, write to
  16  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
  17  * USA.
  18  *
  19  */
  20
  21 #include <linux/blkdev.h>
  22 #include <linux/blk-mq.h>
  23 #include <linux/list.h>
  24 #include <linux/types.h>
  25 #include <linux/sem.h>
  26 #include <linux/bitmap.h>
  27 #include <linux/module.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/lightnvm.h>
  30 #include <linux/sched/sysctl.h>
  31 #include <uapi/linux/lightnvm.h>
  32
  33 static LIST_HEAD(nvm_targets);
  34 static LIST_HEAD(nvm_mgrs);
  35 static LIST_HEAD(nvm_devices);
  36 static DECLARE_RWSEM(nvm_lock);
  37
  38 static struct nvm_tgt_type *nvm_find_target_type(const char *name)
  39 {
  40         struct nvm_tgt_type *tt;
  41
  42         list_for_each_entry(tt, &nvm_targets, list)
  43                 if (!strcmp(name, tt->name))
  44                         return tt;
  45
  46         return NULL;
  47 }
  48
  49 int nvm_register_target(struct nvm_tgt_type *tt)
  50 {
  51         int ret = 0;
  52
  53         down_write(&nvm_lock);
  54         if (nvm_find_target_type(tt->name))
  55                 ret = -EEXIST;
  56         else
  57                 list_add(&tt->list, &nvm_targets);
  58         up_write(&nvm_lock);
  59
  60         return ret;
  61 }
  62 EXPORT_SYMBOL(nvm_register_target);
  63
  64 void nvm_unregister_target(struct nvm_tgt_type *tt)
  65 {
  66         if (!tt)
  67                 return;
  68
  69         down_write(&nvm_lock);
  70         list_del(&tt->list);
  71         up_write(&nvm_lock);
  72 }
  73 EXPORT_SYMBOL(nvm_unregister_target);
  74
  75 void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
  76                                                         dma_addr_t *dma_handler)
  77 {
  78         return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags,
  79                                                                 dma_handler);
  80 }
  81 EXPORT_SYMBOL(nvm_dev_dma_alloc);
  82
  83 void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list,
  84                                                         dma_addr_t dma_handler)
  85 {
  86         dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler);
  87 }
  88 EXPORT_SYMBOL(nvm_dev_dma_free);
  89
  90 static struct nvmm_type *nvm_find_mgr_type(const char *name)
  91 {
  92         struct nvmm_type *mt;
  93
  94         list_for_each_entry(mt, &nvm_mgrs, list)
  95                 if (!strcmp(name, mt->name))
  96                         return mt;
  97
  98         return NULL;
  99 }
 100
 101 struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev)
 102 {
 103         struct nvmm_type *mt;
 104         int ret;
 105
 106         lockdep_assert_held(&nvm_lock);
 107
 108         list_for_each_entry(mt, &nvm_mgrs, list) {
 109                 if (strncmp(dev->sb.mmtype, mt->name, NVM_MMTYPE_LEN))
 110                         continue;
 111
 112                 ret = mt->register_mgr(dev);
 113                 if (ret < 0) {
 114                         pr_err("nvm: media mgr failed to init (%d) on dev %s\n",
 115                                                                 ret, dev->name);
 116                         return NULL; /* initialization failed */
 117                 } else if (ret > 0)
 118                         return mt;
 119         }
 120
 121         return NULL;
 122 }
 123
 124 int nvm_register_mgr(struct nvmm_type *mt)
 125 {
 126         struct nvm_dev *dev;
 127         int ret = 0;
 128
 129         down_write(&nvm_lock);
 130         if (nvm_find_mgr_type(mt->name)) {
 131                 ret = -EEXIST;
 132                 goto finish;
 133         } else {
 134                 list_add(&mt->list, &nvm_mgrs);
 135         }
 136
 137         /* try to register media mgr if any device have none configured */
 138         list_for_each_entry(dev, &nvm_devices, devices) {
 139                 if (dev->mt)
 140                         continue;
 141
 142                 dev->mt = nvm_init_mgr(dev);
 143         }
 144 finish:
 145         up_write(&nvm_lock);
 146
 147         return ret;
 148 }
 149 EXPORT_SYMBOL(nvm_register_mgr);
 150
 151 void nvm_unregister_mgr(struct nvmm_type *mt)
 152 {
 153         if (!mt)
 154                 return;
 155
 156         down_write(&nvm_lock);
 157         list_del(&mt->list);
 158         up_write(&nvm_lock);
 159 }
 160 EXPORT_SYMBOL(nvm_unregister_mgr);
 161
 162 static struct nvm_dev *nvm_find_nvm_dev(const char *name)
 163 {
 164         struct nvm_dev *dev;
 165
 166         list_for_each_entry(dev, &nvm_devices, devices)
 167                 if (!strcmp(name, dev->name))
 168                         return dev;
 169
 170         return NULL;
 171 }
 172
 173 struct nvm_block *nvm_get_blk_unlocked(struct nvm_dev *dev, struct nvm_lun *lun,
 174                                                         unsigned long flags)
 175 {
 176         return dev->mt->get_blk_unlocked(dev, lun, flags);
 177 }
 178 EXPORT_SYMBOL(nvm_get_blk_unlocked);
 179
 180 /* Assumes that all valid pages have already been moved on release to bm */
 181 void nvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk)
 182 {
 183         return dev->mt->put_blk_unlocked(dev, blk);
 184 }
 185 EXPORT_SYMBOL(nvm_put_blk_unlocked);
 186
 187 struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun,
 188                                                         unsigned long flags)
 189 {
 190         return dev->mt->get_blk(dev, lun, flags);
 191 }
 192 EXPORT_SYMBOL(nvm_get_blk);
 193
 194 /* Assumes that all valid pages have already been moved on release to bm */
 195 void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
 196 {
 197         return dev->mt->put_blk(dev, blk);
 198 }
 199 EXPORT_SYMBOL(nvm_put_blk);
 200
 201 int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
 202 {
 203         return dev->mt->submit_io(dev, rqd);
 204 }
 205 EXPORT_SYMBOL(nvm_submit_io);
 206
 207 int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
 208 {
 209         return dev->mt->erase_blk(dev, blk, 0);
 210 }
 211 EXPORT_SYMBOL(nvm_erase_blk);
 212
 213 void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 214 {
 215         int i;
 216
 217         if (rqd->nr_pages > 1) {
 218                 for (i = 0; i < rqd->nr_pages; i++)
 219                         rqd->ppa_list[i] = dev_to_generic_addr(dev,
 220                                                         rqd->ppa_list[i]);
 221         } else {
 222                 rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr);
 223         }
 224 }
 225 EXPORT_SYMBOL(nvm_addr_to_generic_mode);
 226
 227 void nvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 228 {
 229         int i;
 230
 231         if (rqd->nr_pages > 1) {
 232                 for (i = 0; i < rqd->nr_pages; i++)
 233                         rqd->ppa_list[i] = generic_to_dev_addr(dev,
 234                                                         rqd->ppa_list[i]);
 235         } else {
 236                 rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
 237         }
 238 }
 239 EXPORT_SYMBOL(nvm_generic_to_addr_mode);
 240
 241 int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
 242                                         struct ppa_addr *ppas, int nr_ppas)
 243 {
 244         int i, plane_cnt, pl_idx;
 245
 246         if (dev->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
 247                 rqd->nr_pages = 1;
 248                 rqd->ppa_addr = ppas[0];
 249
 250                 return 0;
 251         }
 252
 253         plane_cnt = (1 << dev->plane_mode);
 254         rqd->nr_pages = plane_cnt * nr_ppas;
 255
 256         if (dev->ops->max_phys_sect < rqd->nr_pages)
 257                 return -EINVAL;
 258
 259         rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
 260         if (!rqd->ppa_list) {
 261                 pr_err("nvm: failed to allocate dma memory\n");
 262                 return -ENOMEM;
 263         }
 264
 265         for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
 266                 for (i = 0; i < nr_ppas; i++) {
 267                         ppas[i].g.pl = pl_idx;
 268                         rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppas[i];
 269                 }
 270         }
 271
 272         return 0;
 273 }
 274 EXPORT_SYMBOL(nvm_set_rqd_ppalist);
 275
 276 void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
 277 {
 278         if (!rqd->ppa_list)
 279                 return;
 280
 281         nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
 282 }
 283 EXPORT_SYMBOL(nvm_free_rqd_ppalist);
 284
 285 int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas)
 286 {
 287         struct nvm_rq rqd;
 288         int ret;
 289
 290         if (!dev->ops->erase_block)
 291                 return 0;
 292
 293         memset(&rqd, 0, sizeof(struct nvm_rq));
 294
 295         ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas);
 296         if (ret)
 297                 return ret;
 298
 299         nvm_generic_to_addr_mode(dev, &rqd);
 300
 301         ret = dev->ops->erase_block(dev, &rqd);
 302
 303         nvm_free_rqd_ppalist(dev, &rqd);
 304
 305         return ret;
 306 }
 307 EXPORT_SYMBOL(nvm_erase_ppa);
 308
 309 void nvm_end_io(struct nvm_rq *rqd, int error)
 310 {
 311         rqd->error = error;
 312         rqd->end_io(rqd);
 313 }
 314 EXPORT_SYMBOL(nvm_end_io);
 315
 316 static void nvm_end_io_sync(struct nvm_rq *rqd)
 317 {
 318         struct completion *waiting = rqd->wait;
 319
 320         rqd->wait = NULL;
 321
 322         complete(waiting);
 323 }
 324
 325 int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas,
 326                                 int opcode, int flags, void *buf, int len)
 327 {
 328         DECLARE_COMPLETION_ONSTACK(wait);
 329         struct nvm_rq rqd;
 330         struct bio *bio;
 331         int ret;
 332         unsigned long hang_check;
 333
 334         bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL);
 335         if (IS_ERR_OR_NULL(bio))
 336                 return -ENOMEM;
 337
 338         memset(&rqd, 0, sizeof(struct nvm_rq));
 339         ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas);
 340         if (ret) {
 341                 bio_put(bio);
 342                 return ret;
 343         }
 344
 345         rqd.opcode = opcode;
 346         rqd.bio = bio;
 347         rqd.wait = &wait;
 348         rqd.dev = dev;
 349         rqd.end_io = nvm_end_io_sync;
 350         rqd.flags = flags;
 351         nvm_generic_to_addr_mode(dev, &rqd);
 352
 353         ret = dev->ops->submit_io(dev, &rqd);
 354
 355         /* Prevent hang_check timer from firing at us during very long I/O */
 356         hang_check = sysctl_hung_task_timeout_secs;
 357         if (hang_check)
 358                 while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
 359         else
 360                 wait_for_completion_io(&wait);
 361
 362         nvm_free_rqd_ppalist(dev, &rqd);
 363
 364         return rqd.error;
 365 }
 366 EXPORT_SYMBOL(nvm_submit_ppa);
 367
 368 static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 369 {
 370         int i;
 371
 372         dev->lps_per_blk = dev->pgs_per_blk;
 373         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 374         if (!dev->lptbl)
 375                 return -ENOMEM;
 376
 377         /* Just a linear array */
 378         for (i = 0; i < dev->lps_per_blk; i++)
 379                 dev->lptbl[i] = i;
 380
 381         return 0;
 382 }
 383
 384 static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
 385 {
 386         int i, p;
 387         struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
 388
 389         if (!mlc->num_pairs)
 390                 return 0;
 391
 392         dev->lps_per_blk = mlc->num_pairs;
 393         dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
 394         if (!dev->lptbl)
 395                 return -ENOMEM;
 396
 397         /* The lower page table encoding consists of a list of bytes, where each
 398          * has a lower and an upper half. The first half byte maintains the
 399          * increment value and every value after is an offset added to the
 400          * previous incrementation value */
 401         dev->lptbl[0] = mlc->pairs[0] & 0xF;
 402         for (i = 1; i < dev->lps_per_blk; i++) {
 403                 p = mlc->pairs[i >> 1];
 404                 if (i & 0x1) /* upper */
 405                         dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
 406                 else /* lower */
 407                         dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
 408         }
 409
 410         return 0;
 411 }
 412
 413 static int nvm_core_init(struct nvm_dev *dev)
 414 {
 415         struct nvm_id *id = &dev->identity;
 416         struct nvm_id_group *grp = &id->groups[0];
 417
 418         /* device values */
 419         dev->nr_chnls = grp->num_ch;
 420         dev->luns_per_chnl = grp->num_lun;
 421         dev->pgs_per_blk = grp->num_pg;
 422         dev->blks_per_lun = grp->num_blk;
 423         dev->nr_planes = grp->num_pln;
 424         dev->sec_size = grp->csecs;
 425         dev->oob_size = grp->sos;
 426         dev->sec_per_pg = grp->fpg_sz / grp->csecs;
 427         dev->mccap = grp->mccap;
 428         memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
 429
 430         dev->plane_mode = NVM_PLANE_SINGLE;
 431         dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
 432
 433         if (grp->mtype != 0) {
 434                 pr_err("nvm: memory type not supported\n");
 435                 return -EINVAL;
 436         }
 437
 438         switch (grp->fmtype) {
 439         case NVM_ID_FMTYPE_SLC:
 440                 if (nvm_init_slc_tbl(dev, grp))
 441                         return -ENOMEM;
 442                 break;
 443         case NVM_ID_FMTYPE_MLC:
 444                 if (nvm_init_mlc_tbl(dev, grp))
 445                         return -ENOMEM;
 446                 break;
 447         default:
 448                 pr_err("nvm: flash type not supported\n");
 449                 return -EINVAL;
 450         }
 451
 452         if (!dev->lps_per_blk)
 453                 pr_info("nvm: lower page programming table missing\n");
 454
 455         if (grp->mpos & 0x020202)
 456                 dev->plane_mode = NVM_PLANE_DOUBLE;
 457         if (grp->mpos & 0x040404)
 458                 dev->plane_mode = NVM_PLANE_QUAD;
 459
 460         /* calculated values */
 461         dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
 462         dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
 463         dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
 464         dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
 465
 466         dev->total_blocks = dev->nr_planes *
 467                                 dev->blks_per_lun *
 468                                 dev->luns_per_chnl *
 469                                 dev->nr_chnls;
 470         dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
 471         INIT_LIST_HEAD(&dev->online_targets);
 472         mutex_init(&dev->mlock);
 473
 474         return 0;
 475 }
 476
 477 static void nvm_free(struct nvm_dev *dev)
 478 {
 479         if (!dev)
 480                 return;
 481
 482         if (dev->mt)
 483                 dev->mt->unregister_mgr(dev);
 484
 485         kfree(dev->lptbl);
 486 }
 487
 488 static int nvm_init(struct nvm_dev *dev)
 489 {
 490         int ret = -EINVAL;
 491
 492         if (!dev->q || !dev->ops)
 493                 return ret;
 494
 495         if (dev->ops->identity(dev, &dev->identity)) {
 496                 pr_err("nvm: device could not be identified\n");
 497                 goto err;
 498         }
 499
 500         pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
 501                         dev->identity.ver_id, dev->identity.vmnt,
 502                                                         dev->identity.cgrps);
 503
 504         if (dev->identity.ver_id != 1) {
 505                 pr_err("nvm: device not supported by kernel.");
 506                 goto err;
 507         }
 508
 509         if (dev->identity.cgrps != 1) {
 510                 pr_err("nvm: only one group configuration supported.");
 511                 goto err;
 512         }
 513
 514         ret = nvm_core_init(dev);
 515         if (ret) {
 516                 pr_err("nvm: could not initialize core structures.\n");
 517                 goto err;
 518         }
 519
 520         pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
 521                         dev->name, dev->sec_per_pg, dev->nr_planes,
 522                         dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
 523                         dev->nr_chnls);
 524         return 0;
 525 err:
 526         pr_err("nvm: failed to initialize nvm\n");
 527         return ret;
 528 }
 529
 530 static void nvm_exit(struct nvm_dev *dev)
 531 {
 532         if (dev->ppalist_pool)
 533                 dev->ops->destroy_dma_pool(dev->ppalist_pool);
 534         nvm_free(dev);
 535
 536         pr_info("nvm: successfully unloaded\n");
 537 }
 538
 539 int nvm_register(struct request_queue *q, char *disk_name,
 540                                                         struct nvm_dev_ops *ops)
 541 {
 542         struct nvm_dev *dev;
 543         int ret;
 544
 545         if (!ops->identity)
 546                 return -EINVAL;
 547
 548         dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
 549         if (!dev)
 550                 return -ENOMEM;
 551
 552         dev->q = q;
 553         dev->ops = ops;
 554         strncpy(dev->name, disk_name, DISK_NAME_LEN);
 555
 556         ret = nvm_init(dev);
 557         if (ret)
 558                 goto err_init;
 559
 560         if (dev->ops->max_phys_sect > 256) {
 561                 pr_info("nvm: max sectors supported is 256.\n");
 562                 ret = -EINVAL;
 563                 goto err_init;
 564         }
 565
 566         if (dev->ops->max_phys_sect > 1) {
 567                 dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist");
 568                 if (!dev->ppalist_pool) {
 569                         pr_err("nvm: could not create ppa pool\n");
 570                         ret = -ENOMEM;
 571                         goto err_init;
 572                 }
 573         }
 574
 575         if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
 576                 ret = nvm_get_sysblock(dev, &dev->sb);
 577                 if (!ret)
 578                         pr_err("nvm: device not initialized.\n");
 579                 else if (ret < 0)
 580                         pr_err("nvm: err (%d) on device initialization\n", ret);
 581         }
 582
 583         /* register device with a supported media manager */
 584         down_write(&nvm_lock);
 585         if (ret > 0)
 586                 dev->mt = nvm_init_mgr(dev);
 587         list_add(&dev->devices, &nvm_devices);
 588         up_write(&nvm_lock);
 589
 590         return 0;
 591 err_init:
 592         kfree(dev);
 593         return ret;
 594 }
 595 EXPORT_SYMBOL(nvm_register);
 596
 597 void nvm_unregister(char *disk_name)
 598 {
 599         struct nvm_dev *dev;
 600
 601         down_write(&nvm_lock);
 602         dev = nvm_find_nvm_dev(disk_name);
 603         if (!dev) {
 604                 pr_err("nvm: could not find device %s to unregister\n",
 605                                                                 disk_name);
 606                 up_write(&nvm_lock);
 607                 return;
 608         }
 609
 610         list_del(&dev->devices);
 611         up_write(&nvm_lock);
 612
 613         nvm_exit(dev);
 614         kfree(dev);
 615 }
 616 EXPORT_SYMBOL(nvm_unregister);
 617
 618 static const struct block_device_operations nvm_fops = {
 619         .owner          = THIS_MODULE,
 620 };
 621
 622 static int nvm_create_target(struct nvm_dev *dev,
 623                                                 struct nvm_ioctl_create *create)
 624 {
 625         struct nvm_ioctl_create_simple *s = &create->conf.s;
 626         struct request_queue *tqueue;
 627         struct gendisk *tdisk;
 628         struct nvm_tgt_type *tt;
 629         struct nvm_target *t;
 630         void *targetdata;
 631
 632         if (!dev->mt) {
 633                 pr_info("nvm: device has no media manager registered.\n");
 634                 return -ENODEV;
 635         }
 636
 637         down_write(&nvm_lock);
 638         tt = nvm_find_target_type(create->tgttype);
 639         if (!tt) {
 640                 pr_err("nvm: target type %s not found\n", create->tgttype);
 641                 up_write(&nvm_lock);
 642                 return -EINVAL;
 643         }
 644
 645         list_for_each_entry(t, &dev->online_targets, list) {
 646                 if (!strcmp(create->tgtname, t->disk->disk_name)) {
 647                         pr_err("nvm: target name already exists.\n");
 648                         up_write(&nvm_lock);
 649                         return -EINVAL;
 650                 }
 651         }
 652         up_write(&nvm_lock);
 653
 654         t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
 655         if (!t)
 656                 return -ENOMEM;
 657
 658         tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
 659         if (!tqueue)
 660                 goto err_t;
 661         blk_queue_make_request(tqueue, tt->make_rq);
 662
 663         tdisk = alloc_disk(0);
 664         if (!tdisk)
 665                 goto err_queue;
 666
 667         sprintf(tdisk->disk_name, "%s", create->tgtname);
 668         tdisk->flags = GENHD_FL_EXT_DEVT;
 669         tdisk->major = 0;
 670         tdisk->first_minor = 0;
 671         tdisk->fops = &nvm_fops;
 672         tdisk->queue = tqueue;
 673
 674         targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
 675         if (IS_ERR(targetdata))
 676                 goto err_init;
 677
 678         tdisk->private_data = targetdata;
 679         tqueue->queuedata = targetdata;
 680
 681         blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
 682
 683         set_capacity(tdisk, tt->capacity(targetdata));
 684         add_disk(tdisk);
 685
 686         t->type = tt;
 687         t->disk = tdisk;
 688
 689         down_write(&nvm_lock);
 690         list_add_tail(&t->list, &dev->online_targets);
 691         up_write(&nvm_lock);
 692
 693         return 0;
 694 err_init:
 695         put_disk(tdisk);
 696 err_queue:
 697         blk_cleanup_queue(tqueue);
 698 err_t:
 699         kfree(t);
 700         return -ENOMEM;
 701 }
 702
 703 static void nvm_remove_target(struct nvm_target *t)
 704 {
 705         struct nvm_tgt_type *tt = t->type;
 706         struct gendisk *tdisk = t->disk;
 707         struct request_queue *q = tdisk->queue;
 708
 709         lockdep_assert_held(&nvm_lock);
 710
 711         del_gendisk(tdisk);
 712         blk_cleanup_queue(q);
 713
 714         if (tt->exit)
 715                 tt->exit(tdisk->private_data);
 716
 717         put_disk(tdisk);
 718
 719         list_del(&t->list);
 720         kfree(t);
 721 }
 722
 723 static int __nvm_configure_create(struct nvm_ioctl_create *create)
 724 {
 725         struct nvm_dev *dev;
 726         struct nvm_ioctl_create_simple *s;
 727
 728         down_write(&nvm_lock);
 729         dev = nvm_find_nvm_dev(create->dev);
 730         up_write(&nvm_lock);
 731         if (!dev) {
 732                 pr_err("nvm: device not found\n");
 733                 return -EINVAL;
 734         }
 735
 736         if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
 737                 pr_err("nvm: config type not valid\n");
 738                 return -EINVAL;
 739         }
 740         s = &create->conf.s;
 741
 742         if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
 743                 pr_err("nvm: lun out of bound (%u:%u > %u)\n",
 744                         s->lun_begin, s->lun_end, dev->nr_luns);
 745                 return -EINVAL;
 746         }
 747
 748         return nvm_create_target(dev, create);
 749 }
 750
 751 static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
 752 {
 753         struct nvm_target *t = NULL;
 754         struct nvm_dev *dev;
 755         int ret = -1;
 756
 757         down_write(&nvm_lock);
 758         list_for_each_entry(dev, &nvm_devices, devices)
 759                 list_for_each_entry(t, &dev->online_targets, list) {
 760                         if (!strcmp(remove->tgtname, t->disk->disk_name)) {
 761                                 nvm_remove_target(t);
 762                                 ret = 0;
 763                                 break;
 764                         }
 765                 }
 766         up_write(&nvm_lock);
 767
 768         if (ret) {
 769                 pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
 770                 return -EINVAL;
 771         }
 772
 773         return 0;
 774 }
 775
 776 #ifdef CONFIG_NVM_DEBUG
 777 static int nvm_configure_show(const char *val)
 778 {
 779         struct nvm_dev *dev;
 780         char opcode, devname[DISK_NAME_LEN];
 781         int ret;
 782
 783         ret = sscanf(val, "%c %32s", &opcode, devname);
 784         if (ret != 2) {
 785                 pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
 786                 return -EINVAL;
 787         }
 788
 789         down_write(&nvm_lock);
 790         dev = nvm_find_nvm_dev(devname);
 791         up_write(&nvm_lock);
 792         if (!dev) {
 793                 pr_err("nvm: device not found\n");
 794                 return -EINVAL;
 795         }
 796
 797         if (!dev->mt)
 798                 return 0;
 799
 800         dev->mt->lun_info_print(dev);
 801
 802         return 0;
 803 }
 804
 805 static int nvm_configure_remove(const char *val)
 806 {
 807         struct nvm_ioctl_remove remove;
 808         char opcode;
 809         int ret;
 810
 811         ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
 812         if (ret != 2) {
 813                 pr_err("nvm: invalid command. Use \"d targetname\".\n");
 814                 return -EINVAL;
 815         }
 816
 817         remove.flags = 0;
 818
 819         return __nvm_configure_remove(&remove);
 820 }
 821
 822 static int nvm_configure_create(const char *val)
 823 {
 824         struct nvm_ioctl_create create;
 825         char opcode;
 826         int lun_begin, lun_end, ret;
 827
 828         ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
 829                                                 create.tgtname, create.tgttype,
 830                                                 &lun_begin, &lun_end);
 831         if (ret != 6) {
 832                 pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
 833                 return -EINVAL;
 834         }
 835
 836         create.flags = 0;
 837         create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
 838         create.conf.s.lun_begin = lun_begin;
 839         create.conf.s.lun_end = lun_end;
 840
 841         return __nvm_configure_create(&create);
 842 }
 843
 844
 845 /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
 846 static int nvm_configure_by_str_event(const char *val,
 847                                         const struct kernel_param *kp)
 848 {
 849         char opcode;
 850         int ret;
 851
 852         ret = sscanf(val, "%c", &opcode);
 853         if (ret != 1) {
 854                 pr_err("nvm: string must have the format of \"cmd ...\"\n");
 855                 return -EINVAL;
 856         }
 857
 858         switch (opcode) {
 859         case 'a':
 860                 return nvm_configure_create(val);
 861         case 'd':
 862                 return nvm_configure_remove(val);
 863         case 's':
 864                 return nvm_configure_show(val);
 865         default:
 866                 pr_err("nvm: invalid command\n");
 867                 return -EINVAL;
 868         }
 869
 870         return 0;
 871 }
 872
 873 static int nvm_configure_get(char *buf, const struct kernel_param *kp)
 874 {
 875         int sz = 0;
 876         char *buf_start = buf;
 877         struct nvm_dev *dev;
 878
 879         buf += sprintf(buf, "available devices:\n");
 880         down_write(&nvm_lock);
 881         list_for_each_entry(dev, &nvm_devices, devices) {
 882                 if (sz > 4095 - DISK_NAME_LEN)
 883                         break;
 884                 buf += sprintf(buf, " %32s\n", dev->name);
 885         }
 886         up_write(&nvm_lock);
 887
 888         return buf - buf_start - 1;
 889 }
 890
 891 static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
 892         .set    = nvm_configure_by_str_event,
 893         .get    = nvm_configure_get,
 894 };
 895
 896 #undef MODULE_PARAM_PREFIX
 897 #define MODULE_PARAM_PREFIX     "lnvm."
 898
 899 module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
 900                                                                         0644);
 901
 902 #endif /* CONFIG_NVM_DEBUG */
 903
 904 static long nvm_ioctl_info(struct file *file, void __user *arg)
 905 {
 906         struct nvm_ioctl_info *info;
 907         struct nvm_tgt_type *tt;
 908         int tgt_iter = 0;
 909
 910         if (!capable(CAP_SYS_ADMIN))
 911                 return -EPERM;
 912
 913         info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
 914         if (IS_ERR(info))
 915                 return -EFAULT;
 916
 917         info->version[0] = NVM_VERSION_MAJOR;
 918         info->version[1] = NVM_VERSION_MINOR;
 919         info->version[2] = NVM_VERSION_PATCH;
 920
 921         down_write(&nvm_lock);
 922         list_for_each_entry(tt, &nvm_targets, list) {
 923                 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
 924
 925                 tgt->version[0] = tt->version[0];
 926                 tgt->version[1] = tt->version[1];
 927                 tgt->version[2] = tt->version[2];
 928                 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
 929
 930                 tgt_iter++;
 931         }
 932
 933         info->tgtsize = tgt_iter;
 934         up_write(&nvm_lock);
 935
 936         if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
 937                 kfree(info);
 938                 return -EFAULT;
 939         }
 940
 941         kfree(info);
 942         return 0;
 943 }
 944
 945 static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
 946 {
 947         struct nvm_ioctl_get_devices *devices;
 948         struct nvm_dev *dev;
 949         int i = 0;
 950
 951         if (!capable(CAP_SYS_ADMIN))
 952                 return -EPERM;
 953
 954         devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
 955         if (!devices)
 956                 return -ENOMEM;
 957
 958         down_write(&nvm_lock);
 959         list_for_each_entry(dev, &nvm_devices, devices) {
 960                 struct nvm_ioctl_device_info *info = &devices->info[i];
 961
 962                 sprintf(info->devname, "%s", dev->name);
 963                 if (dev->mt) {
 964                         info->bmversion[0] = dev->mt->version[0];
 965                         info->bmversion[1] = dev->mt->version[1];
 966                         info->bmversion[2] = dev->mt->version[2];
 967                         sprintf(info->bmname, "%s", dev->mt->name);
 968                 } else {
 969                         sprintf(info->bmname, "none");
 970                 }
 971
 972                 i++;
 973                 if (i > 31) {
 974                         pr_err("nvm: max 31 devices can be reported.\n");
 975                         break;
 976                 }
 977         }
 978         up_write(&nvm_lock);
 979
 980         devices->nr_devices = i;
 981
 982         if (copy_to_user(arg, devices,
 983                          sizeof(struct nvm_ioctl_get_devices))) {
 984                 kfree(devices);
 985                 return -EFAULT;
 986         }
 987
 988         kfree(devices);
 989         return 0;
 990 }
 991
 992 static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
 993 {
 994         struct nvm_ioctl_create create;
 995
 996         if (!capable(CAP_SYS_ADMIN))
 997                 return -EPERM;
 998
 999         if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
1000                 return -EFAULT;
1001
1002         create.dev[DISK_NAME_LEN - 1] = '\0';
1003         create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
1004         create.tgtname[DISK_NAME_LEN - 1] = '\0';
1005
1006         if (create.flags != 0) {
1007                 pr_err("nvm: no flags supported\n");
1008                 return -EINVAL;
1009         }
1010
1011         return __nvm_configure_create(&create);
1012 }
1013
1014 static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
1015 {
1016         struct nvm_ioctl_remove remove;
1017
1018         if (!capable(CAP_SYS_ADMIN))
1019                 return -EPERM;
1020
1021         if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
1022                 return -EFAULT;
1023
1024         remove.tgtname[DISK_NAME_LEN - 1] = '\0';
1025
1026         if (remove.flags != 0) {
1027                 pr_err("nvm: no flags supported\n");
1028                 return -EINVAL;
1029         }
1030
1031         return __nvm_configure_remove(&remove);
1032 }
1033
1034 static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
1035 {
1036         info->seqnr = 1;
1037         info->erase_cnt = 0;
1038         info->version = 1;
1039 }
1040
1041 static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
1042 {
1043         struct nvm_dev *dev;
1044         struct nvm_sb_info info;
1045         int ret;
1046
1047         down_write(&nvm_lock);
1048         dev = nvm_find_nvm_dev(init->dev);
1049         up_write(&nvm_lock);
1050         if (!dev) {
1051                 pr_err("nvm: device not found\n");
1052                 return -EINVAL;
1053         }
1054
1055         nvm_setup_nvm_sb_info(&info);
1056
1057         strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
1058         info.fs_ppa.ppa = -1;
1059
1060         if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
1061                 ret = nvm_init_sysblock(dev, &info);
1062                 if (ret)
1063                         return ret;
1064         }
1065
1066         memcpy(&dev->sb, &info, sizeof(struct nvm_sb_info));
1067
1068         down_write(&nvm_lock);
1069         dev->mt = nvm_init_mgr(dev);
1070         up_write(&nvm_lock);
1071
1072         return 0;
1073 }
1074
1075 static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
1076 {
1077         struct nvm_ioctl_dev_init init;
1078
1079         if (!capable(CAP_SYS_ADMIN))
1080                 return -EPERM;
1081
1082         if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
1083                 return -EFAULT;
1084
1085         if (init.flags != 0) {
1086                 pr_err("nvm: no flags supported\n");
1087                 return -EINVAL;
1088         }
1089
1090         init.dev[DISK_NAME_LEN - 1] = '\0';
1091
1092         return __nvm_ioctl_dev_init(&init);
1093 }
1094
1095 static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
1096 {
1097         struct nvm_ioctl_dev_factory fact;
1098         struct nvm_dev *dev;
1099
1100         if (!capable(CAP_SYS_ADMIN))
1101                 return -EPERM;
1102
1103         if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
1104                 return -EFAULT;
1105
1106         fact.dev[DISK_NAME_LEN - 1] = '\0';
1107
1108         if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
1109                 return -EINVAL;
1110
1111         down_write(&nvm_lock);
1112         dev = nvm_find_nvm_dev(fact.dev);
1113         up_write(&nvm_lock);
1114         if (!dev) {
1115                 pr_err("nvm: device not found\n");
1116                 return -EINVAL;
1117         }
1118
1119         if (dev->mt) {
1120                 dev->mt->unregister_mgr(dev);
1121                 dev->mt = NULL;
1122         }
1123
1124         if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT)
1125                 return nvm_dev_factory(dev, fact.flags);
1126
1127         return 0;
1128 }
1129
1130 static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
1131 {
1132         void __user *argp = (void __user *)arg;
1133
1134         switch (cmd) {
1135         case NVM_INFO:
1136                 return nvm_ioctl_info(file, argp);
1137         case NVM_GET_DEVICES:
1138                 return nvm_ioctl_get_devices(file, argp);
1139         case NVM_DEV_CREATE:
1140                 return nvm_ioctl_dev_create(file, argp);
1141         case NVM_DEV_REMOVE:
1142                 return nvm_ioctl_dev_remove(file, argp);
1143         case NVM_DEV_INIT:
1144                 return nvm_ioctl_dev_init(file, argp);
1145         case NVM_DEV_FACTORY:
1146                 return nvm_ioctl_dev_factory(file, argp);
1147         }
1148         return 0;
1149 }
1150
1151 static const struct file_operations _ctl_fops = {
1152         .open = nonseekable_open,
1153         .unlocked_ioctl = nvm_ctl_ioctl,
1154         .owner = THIS_MODULE,
1155         .llseek  = noop_llseek,
1156 };
1157
1158 static struct miscdevice _nvm_misc = {
1159         .minor          = MISC_DYNAMIC_MINOR,
1160         .name           = "lightnvm",
1161         .nodename       = "lightnvm/control",
1162         .fops           = &_ctl_fops,
1163 };
1164
1165 MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
1166
1167 static int __init nvm_mod_init(void)
1168 {
1169         int ret;
1170
1171         ret = misc_register(&_nvm_misc);
1172         if (ret)
1173                 pr_err("nvm: misc_register failed for control device");
1174
1175         return ret;
1176 }
1177
1178 static void __exit nvm_mod_exit(void)
1179 {
1180         misc_deregister(&_nvm_misc);
1181 }
1182
1183 MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
1184 MODULE_LICENSE("GPL v2");
1185 MODULE_VERSION("0.1");
1186 module_init(nvm_mod_init);
1187 module_exit(nvm_mod_exit);