drivers/lightnvm/pblk-init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
   4  * Copyright (C) 2016 CNEX Labs
   5  * Initial release: Javier Gonzalez <javier@cnexlabs.com>
   6  *                  Matias Bjorling <matias@cnexlabs.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * Implementation of a physical block-device target for Open-channel SSDs.
  18  *
  19  * pblk-init.c - pblk's initialization.
  20  */
  21
  22 #include "pblk.h"
  23 #include "pblk-trace.h"
  24
  25 static unsigned int write_buffer_size;
  26
  27 module_param(write_buffer_size, uint, 0644);
  28 MODULE_PARM_DESC(write_buffer_size, "number of entries in a write buffer");
  29
  30 struct pblk_global_caches {
  31         struct kmem_cache       *ws;
  32         struct kmem_cache       *rec;
  33         struct kmem_cache       *g_rq;
  34         struct kmem_cache       *w_rq;
  35
  36         struct kref             kref;
  37
  38         struct mutex            mutex; /* Ensures consistency between
  39                                         * caches and kref
  40                                         */
  41 };
  42
  43 static struct pblk_global_caches pblk_caches = {
  44         .mutex = __MUTEX_INITIALIZER(pblk_caches.mutex),
  45         .kref = KREF_INIT(0),
  46 };
  47
  48 struct bio_set pblk_bio_set;
  49
  50 static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
  51 {
  52         struct pblk *pblk = q->queuedata;
  53
  54         if (bio_op(bio) == REQ_OP_DISCARD) {
  55                 pblk_discard(pblk, bio);
  56                 if (!(bio->bi_opf & REQ_PREFLUSH)) {
  57                         bio_endio(bio);
  58                         return BLK_QC_T_NONE;
  59                 }
  60         }
  61
  62         /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
  63          * constraint. Writes can be of arbitrary size.
  64          */
  65         if (bio_data_dir(bio) == READ) {
  66                 blk_queue_split(q, &bio);
  67                 pblk_submit_read(pblk, bio);
  68         } else {
  69                 /* Prevent deadlock in the case of a modest LUN configuration
  70                  * and large user I/Os. Unless stalled, the rate limiter
  71                  * leaves at least 256KB available for user I/O.
  72                  */
  73                 if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
  74                         blk_queue_split(q, &bio);
  75
  76                 pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
  77         }
  78
  79         return BLK_QC_T_NONE;
  80 }
  81
  82 static size_t pblk_trans_map_size(struct pblk *pblk)
  83 {
  84         int entry_size = 8;
  85
  86         if (pblk->addrf_len < 32)
  87                 entry_size = 4;
  88
  89         return entry_size * pblk->capacity;
  90 }
  91
  92 #ifdef CONFIG_NVM_PBLK_DEBUG
  93 static u32 pblk_l2p_crc(struct pblk *pblk)
  94 {
  95         size_t map_size;
  96         u32 crc = ~(u32)0;
  97
  98         map_size = pblk_trans_map_size(pblk);
  99         crc = crc32_le(crc, pblk->trans_map, map_size);
 100         return crc;
 101 }
 102 #endif
 103
 104 static void pblk_l2p_free(struct pblk *pblk)
 105 {
 106         vfree(pblk->trans_map);
 107 }
 108
 109 static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
 110 {
 111         struct pblk_line *line = NULL;
 112
 113         if (factory_init) {
 114                 guid_gen(&pblk->instance_uuid);
 115         } else {
 116                 line = pblk_recov_l2p(pblk);
 117                 if (IS_ERR(line)) {
 118                         pblk_err(pblk, "could not recover l2p table\n");
 119                         return -EFAULT;
 120                 }
 121         }
 122
 123 #ifdef CONFIG_NVM_PBLK_DEBUG
 124         pblk_info(pblk, "init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
 125 #endif
 126
 127         /* Free full lines directly as GC has not been started yet */
 128         pblk_gc_free_full_lines(pblk);
 129
 130         if (!line) {
 131                 /* Configure next line for user data */
 132                 line = pblk_line_get_first_data(pblk);
 133                 if (!line)
 134                         return -EFAULT;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
 141 {
 142         sector_t i;
 143         struct ppa_addr ppa;
 144         size_t map_size;
 145         int ret = 0;
 146
 147         map_size = pblk_trans_map_size(pblk);
 148         pblk->trans_map = __vmalloc(map_size, GFP_KERNEL | __GFP_NOWARN
 149                                         | __GFP_RETRY_MAYFAIL | __GFP_HIGHMEM,
 150                                         PAGE_KERNEL);
 151         if (!pblk->trans_map) {
 152                 pblk_err(pblk, "failed to allocate L2P (need %zu of memory)\n",
 153                                 map_size);
 154                 return -ENOMEM;
 155         }
 156
 157         pblk_ppa_set_empty(&ppa);
 158
 159         for (i = 0; i < pblk->capacity; i++)
 160                 pblk_trans_map_set(pblk, i, ppa);
 161
 162         ret = pblk_l2p_recover(pblk, factory_init);
 163         if (ret)
 164                 vfree(pblk->trans_map);
 165
 166         return ret;
 167 }
 168
 169 static void pblk_rwb_free(struct pblk *pblk)
 170 {
 171         if (pblk_rb_tear_down_check(&pblk->rwb))
 172                 pblk_err(pblk, "write buffer error on tear down\n");
 173
 174         pblk_rb_free(&pblk->rwb);
 175 }
 176
 177 static int pblk_rwb_init(struct pblk *pblk)
 178 {
 179         struct nvm_tgt_dev *dev = pblk->dev;
 180         struct nvm_geo *geo = &dev->geo;
 181         unsigned long buffer_size;
 182         int pgs_in_buffer, threshold;
 183
 184         threshold = geo->mw_cunits * geo->all_luns;
 185         pgs_in_buffer = (max(geo->mw_cunits, geo->ws_opt) + geo->ws_opt)
 186                                                                 * geo->all_luns;
 187
 188         if (write_buffer_size && (write_buffer_size > pgs_in_buffer))
 189                 buffer_size = write_buffer_size;
 190         else
 191                 buffer_size = pgs_in_buffer;
 192
 193         return pblk_rb_init(&pblk->rwb, buffer_size, threshold, geo->csecs);
 194 }
 195
 196 static int pblk_set_addrf_12(struct pblk *pblk, struct nvm_geo *geo,
 197                              struct nvm_addrf_12 *dst)
 198 {
 199         struct nvm_addrf_12 *src = (struct nvm_addrf_12 *)&geo->addrf;
 200         int power_len;
 201
 202         /* Re-calculate channel and lun format to adapt to configuration */
 203         power_len = get_count_order(geo->num_ch);
 204         if (1 << power_len != geo->num_ch) {
 205                 pblk_err(pblk, "supports only power-of-two channel config.\n");
 206                 return -EINVAL;
 207         }
 208         dst->ch_len = power_len;
 209
 210         power_len = get_count_order(geo->num_lun);
 211         if (1 << power_len != geo->num_lun) {
 212                 pblk_err(pblk, "supports only power-of-two LUN config.\n");
 213                 return -EINVAL;
 214         }
 215         dst->lun_len = power_len;
 216
 217         dst->blk_len = src->blk_len;
 218         dst->pg_len = src->pg_len;
 219         dst->pln_len = src->pln_len;
 220         dst->sec_len = src->sec_len;
 221
 222         dst->sec_offset = 0;
 223         dst->pln_offset = dst->sec_len;
 224         dst->ch_offset = dst->pln_offset + dst->pln_len;
 225         dst->lun_offset = dst->ch_offset + dst->ch_len;
 226         dst->pg_offset = dst->lun_offset + dst->lun_len;
 227         dst->blk_offset = dst->pg_offset + dst->pg_len;
 228
 229         dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
 230         dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
 231         dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
 232         dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
 233         dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
 234         dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;
 235
 236         return dst->blk_offset + src->blk_len;
 237 }
 238
 239 static int pblk_set_addrf_20(struct nvm_geo *geo, struct nvm_addrf *adst,
 240                              struct pblk_addrf *udst)
 241 {
 242         struct nvm_addrf *src = &geo->addrf;
 243
 244         adst->ch_len = get_count_order(geo->num_ch);
 245         adst->lun_len = get_count_order(geo->num_lun);
 246         adst->chk_len = src->chk_len;
 247         adst->sec_len = src->sec_len;
 248
 249         adst->sec_offset = 0;
 250         adst->ch_offset = adst->sec_len;
 251         adst->lun_offset = adst->ch_offset + adst->ch_len;
 252         adst->chk_offset = adst->lun_offset + adst->lun_len;
 253
 254         adst->sec_mask = ((1ULL << adst->sec_len) - 1) << adst->sec_offset;
 255         adst->chk_mask = ((1ULL << adst->chk_len) - 1) << adst->chk_offset;
 256         adst->lun_mask = ((1ULL << adst->lun_len) - 1) << adst->lun_offset;
 257         adst->ch_mask = ((1ULL << adst->ch_len) - 1) << adst->ch_offset;
 258
 259         udst->sec_stripe = geo->ws_opt;
 260         udst->ch_stripe = geo->num_ch;
 261         udst->lun_stripe = geo->num_lun;
 262
 263         udst->sec_lun_stripe = udst->sec_stripe * udst->ch_stripe;
 264         udst->sec_ws_stripe = udst->sec_lun_stripe * udst->lun_stripe;
 265
 266         return adst->chk_offset + adst->chk_len;
 267 }
 268
 269 static int pblk_set_addrf(struct pblk *pblk)
 270 {
 271         struct nvm_tgt_dev *dev = pblk->dev;
 272         struct nvm_geo *geo = &dev->geo;
 273         int mod;
 274
 275         switch (geo->version) {
 276         case NVM_OCSSD_SPEC_12:
 277                 div_u64_rem(geo->clba, pblk->min_write_pgs, &mod);
 278                 if (mod) {
 279                         pblk_err(pblk, "bad configuration of sectors/pages\n");
 280                         return -EINVAL;
 281                 }
 282
 283                 pblk->addrf_len = pblk_set_addrf_12(pblk, geo,
 284                                                         (void *)&pblk->addrf);
 285                 break;
 286         case NVM_OCSSD_SPEC_20:
 287                 pblk->addrf_len = pblk_set_addrf_20(geo, (void *)&pblk->addrf,
 288                                                         &pblk->uaddrf);
 289                 break;
 290         default:
 291                 pblk_err(pblk, "OCSSD revision not supported (%d)\n",
 292                                                                 geo->version);
 293                 return -EINVAL;
 294         }
 295
 296         return 0;
 297 }
 298
 299 static int pblk_create_global_caches(void)
 300 {
 301
 302         pblk_caches.ws = kmem_cache_create("pblk_blk_ws",
 303                                 sizeof(struct pblk_line_ws), 0, 0, NULL);
 304         if (!pblk_caches.ws)
 305                 return -ENOMEM;
 306
 307         pblk_caches.rec = kmem_cache_create("pblk_rec",
 308                                 sizeof(struct pblk_rec_ctx), 0, 0, NULL);
 309         if (!pblk_caches.rec)
 310                 goto fail_destroy_ws;
 311
 312         pblk_caches.g_rq = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
 313                                 0, 0, NULL);
 314         if (!pblk_caches.g_rq)
 315                 goto fail_destroy_rec;
 316
 317         pblk_caches.w_rq = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
 318                                 0, 0, NULL);
 319         if (!pblk_caches.w_rq)
 320                 goto fail_destroy_g_rq;
 321
 322         return 0;
 323
 324 fail_destroy_g_rq:
 325         kmem_cache_destroy(pblk_caches.g_rq);
 326 fail_destroy_rec:
 327         kmem_cache_destroy(pblk_caches.rec);
 328 fail_destroy_ws:
 329         kmem_cache_destroy(pblk_caches.ws);
 330
 331         return -ENOMEM;
 332 }
 333
 334 static int pblk_get_global_caches(void)
 335 {
 336         int ret = 0;
 337
 338         mutex_lock(&pblk_caches.mutex);
 339
 340         if (kref_get_unless_zero(&pblk_caches.kref))
 341                 goto out;
 342
 343         ret = pblk_create_global_caches();
 344         if (!ret)
 345                 kref_init(&pblk_caches.kref);
 346
 347 out:
 348         mutex_unlock(&pblk_caches.mutex);
 349         return ret;
 350 }
 351
 352 static void pblk_destroy_global_caches(struct kref *ref)
 353 {
 354         struct pblk_global_caches *c;
 355
 356         c = container_of(ref, struct pblk_global_caches, kref);
 357
 358         kmem_cache_destroy(c->ws);
 359         kmem_cache_destroy(c->rec);
 360         kmem_cache_destroy(c->g_rq);
 361         kmem_cache_destroy(c->w_rq);
 362 }
 363
 364 static void pblk_put_global_caches(void)
 365 {
 366         mutex_lock(&pblk_caches.mutex);
 367         kref_put(&pblk_caches.kref, pblk_destroy_global_caches);
 368         mutex_unlock(&pblk_caches.mutex);
 369 }
 370
 371 static int pblk_core_init(struct pblk *pblk)
 372 {
 373         struct nvm_tgt_dev *dev = pblk->dev;
 374         struct nvm_geo *geo = &dev->geo;
 375         int ret, max_write_ppas;
 376
 377         atomic64_set(&pblk->user_wa, 0);
 378         atomic64_set(&pblk->pad_wa, 0);
 379         atomic64_set(&pblk->gc_wa, 0);
 380         pblk->user_rst_wa = 0;
 381         pblk->pad_rst_wa = 0;
 382         pblk->gc_rst_wa = 0;
 383
 384         atomic64_set(&pblk->nr_flush, 0);
 385         pblk->nr_flush_rst = 0;
 386
 387         pblk->min_write_pgs = geo->ws_opt;
 388         pblk->min_write_pgs_data = pblk->min_write_pgs;
 389         max_write_ppas = pblk->min_write_pgs * geo->all_luns;
 390         pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
 391         pblk->max_write_pgs = min_t(int, pblk->max_write_pgs,
 392                 queue_max_hw_sectors(dev->q) / (geo->csecs >> SECTOR_SHIFT));
 393         pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
 394
 395         pblk->oob_meta_size = geo->sos;
 396         if (!pblk_is_oob_meta_supported(pblk)) {
 397                 /* For drives which does not have OOB metadata feature
 398                  * in order to support recovery feature we need to use
 399                  * so called packed metadata. Packed metada will store
 400                  * the same information as OOB metadata (l2p table mapping,
 401                  * but in the form of the single page at the end of
 402                  * every write request.
 403                  */
 404                 if (pblk->min_write_pgs
 405                         * sizeof(struct pblk_sec_meta) > PAGE_SIZE) {
 406                         /* We want to keep all the packed metadata on single
 407                          * page per write requests. So we need to ensure that
 408                          * it will fit.
 409                          *
 410                          * This is more like sanity check, since there is
 411                          * no device with such a big minimal write size
 412                          * (above 1 metabytes).
 413                          */
 414                         pblk_err(pblk, "Not supported min write size\n");
 415                         return -EINVAL;
 416                 }
 417                 /* For packed meta approach we do some simplification.
 418                  * On read path we always issue requests which size
 419                  * equal to max_write_pgs, with all pages filled with
 420                  * user payload except of last one page which will be
 421                  * filled with packed metadata.
 422                  */
 423                 pblk->max_write_pgs = pblk->min_write_pgs;
 424                 pblk->min_write_pgs_data = pblk->min_write_pgs - 1;
 425         }
 426
 427         pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t),
 428                                                                 GFP_KERNEL);
 429         if (!pblk->pad_dist)
 430                 return -ENOMEM;
 431
 432         if (pblk_get_global_caches())
 433                 goto fail_free_pad_dist;
 434
 435         /* Internal bios can be at most the sectors signaled by the device. */
 436         ret = mempool_init_page_pool(&pblk->page_bio_pool, NVM_MAX_VLBA, 0);
 437         if (ret)
 438                 goto free_global_caches;
 439
 440         ret = mempool_init_slab_pool(&pblk->gen_ws_pool, PBLK_GEN_WS_POOL_SIZE,
 441                                      pblk_caches.ws);
 442         if (ret)
 443                 goto free_page_bio_pool;
 444
 445         ret = mempool_init_slab_pool(&pblk->rec_pool, geo->all_luns,
 446                                      pblk_caches.rec);
 447         if (ret)
 448                 goto free_gen_ws_pool;
 449
 450         ret = mempool_init_slab_pool(&pblk->r_rq_pool, geo->all_luns,
 451                                      pblk_caches.g_rq);
 452         if (ret)
 453                 goto free_rec_pool;
 454
 455         ret = mempool_init_slab_pool(&pblk->e_rq_pool, geo->all_luns,
 456                                      pblk_caches.g_rq);
 457         if (ret)
 458                 goto free_r_rq_pool;
 459
 460         ret = mempool_init_slab_pool(&pblk->w_rq_pool, geo->all_luns,
 461                                      pblk_caches.w_rq);
 462         if (ret)
 463                 goto free_e_rq_pool;
 464
 465         pblk->close_wq = alloc_workqueue("pblk-close-wq",
 466                         WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
 467         if (!pblk->close_wq)
 468                 goto free_w_rq_pool;
 469
 470         pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
 471                         WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
 472         if (!pblk->bb_wq)
 473                 goto free_close_wq;
 474
 475         pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
 476                         WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
 477         if (!pblk->r_end_wq)
 478                 goto free_bb_wq;
 479
 480         if (pblk_set_addrf(pblk))
 481                 goto free_r_end_wq;
 482
 483         INIT_LIST_HEAD(&pblk->compl_list);
 484         INIT_LIST_HEAD(&pblk->resubmit_list);
 485
 486         return 0;
 487
 488 free_r_end_wq:
 489         destroy_workqueue(pblk->r_end_wq);
 490 free_bb_wq:
 491         destroy_workqueue(pblk->bb_wq);
 492 free_close_wq:
 493         destroy_workqueue(pblk->close_wq);
 494 free_w_rq_pool:
 495         mempool_exit(&pblk->w_rq_pool);
 496 free_e_rq_pool:
 497         mempool_exit(&pblk->e_rq_pool);
 498 free_r_rq_pool:
 499         mempool_exit(&pblk->r_rq_pool);
 500 free_rec_pool:
 501         mempool_exit(&pblk->rec_pool);
 502 free_gen_ws_pool:
 503         mempool_exit(&pblk->gen_ws_pool);
 504 free_page_bio_pool:
 505         mempool_exit(&pblk->page_bio_pool);
 506 free_global_caches:
 507         pblk_put_global_caches();
 508 fail_free_pad_dist:
 509         kfree(pblk->pad_dist);
 510         return -ENOMEM;
 511 }
 512
 513 static void pblk_core_free(struct pblk *pblk)
 514 {
 515         if (pblk->close_wq)
 516                 destroy_workqueue(pblk->close_wq);
 517
 518         if (pblk->r_end_wq)
 519                 destroy_workqueue(pblk->r_end_wq);
 520
 521         if (pblk->bb_wq)
 522                 destroy_workqueue(pblk->bb_wq);
 523
 524         mempool_exit(&pblk->page_bio_pool);
 525         mempool_exit(&pblk->gen_ws_pool);
 526         mempool_exit(&pblk->rec_pool);
 527         mempool_exit(&pblk->r_rq_pool);
 528         mempool_exit(&pblk->e_rq_pool);
 529         mempool_exit(&pblk->w_rq_pool);
 530
 531         pblk_put_global_caches();
 532         kfree(pblk->pad_dist);
 533 }
 534
 535 static void pblk_line_mg_free(struct pblk *pblk)
 536 {
 537         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 538         int i;
 539
 540         kfree(l_mg->bb_template);
 541         kfree(l_mg->bb_aux);
 542         kfree(l_mg->vsc_list);
 543
 544         for (i = 0; i < PBLK_DATA_LINES; i++) {
 545                 kfree(l_mg->sline_meta[i]);
 546                 kvfree(l_mg->eline_meta[i]->buf);
 547                 kfree(l_mg->eline_meta[i]);
 548         }
 549
 550         mempool_destroy(l_mg->bitmap_pool);
 551         kmem_cache_destroy(l_mg->bitmap_cache);
 552 }
 553
 554 static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
 555                                 struct pblk_line *line)
 556 {
 557         struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
 558
 559         kfree(line->blk_bitmap);
 560         kfree(line->erase_bitmap);
 561         kfree(line->chks);
 562
 563         kvfree(w_err_gc->lba_list);
 564         kfree(w_err_gc);
 565 }
 566
 567 static void pblk_lines_free(struct pblk *pblk)
 568 {
 569         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 570         struct pblk_line *line;
 571         int i;
 572
 573         for (i = 0; i < l_mg->nr_lines; i++) {
 574                 line = &pblk->lines[i];
 575
 576                 pblk_line_free(line);
 577                 pblk_line_meta_free(l_mg, line);
 578         }
 579
 580         pblk_line_mg_free(pblk);
 581
 582         kfree(pblk->luns);
 583         kfree(pblk->lines);
 584 }
 585
 586 static int pblk_luns_init(struct pblk *pblk)
 587 {
 588         struct nvm_tgt_dev *dev = pblk->dev;
 589         struct nvm_geo *geo = &dev->geo;
 590         struct pblk_lun *rlun;
 591         int i;
 592
 593         /* TODO: Implement unbalanced LUN support */
 594         if (geo->num_lun < 0) {
 595                 pblk_err(pblk, "unbalanced LUN config.\n");
 596                 return -EINVAL;
 597         }
 598
 599         pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
 600                                                                 GFP_KERNEL);
 601         if (!pblk->luns)
 602                 return -ENOMEM;
 603
 604         for (i = 0; i < geo->all_luns; i++) {
 605                 /* Stripe across channels */
 606                 int ch = i % geo->num_ch;
 607                 int lun_raw = i / geo->num_ch;
 608                 int lunid = lun_raw + ch * geo->num_lun;
 609
 610                 rlun = &pblk->luns[i];
 611                 rlun->bppa = dev->luns[lunid];
 612
 613                 sema_init(&rlun->wr_sem, 1);
 614         }
 615
 616         return 0;
 617 }
 618
 619 /* See comment over struct line_emeta definition */
 620 static unsigned int calc_emeta_len(struct pblk *pblk)
 621 {
 622         struct pblk_line_meta *lm = &pblk->lm;
 623         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 624         struct nvm_tgt_dev *dev = pblk->dev;
 625         struct nvm_geo *geo = &dev->geo;
 626
 627         /* Round to sector size so that lba_list starts on its own sector */
 628         lm->emeta_sec[1] = DIV_ROUND_UP(
 629                         sizeof(struct line_emeta) + lm->blk_bitmap_len +
 630                         sizeof(struct wa_counters), geo->csecs);
 631         lm->emeta_len[1] = lm->emeta_sec[1] * geo->csecs;
 632
 633         /* Round to sector size so that vsc_list starts on its own sector */
 634         lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
 635         lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
 636                         geo->csecs);
 637         lm->emeta_len[2] = lm->emeta_sec[2] * geo->csecs;
 638
 639         lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
 640                         geo->csecs);
 641         lm->emeta_len[3] = lm->emeta_sec[3] * geo->csecs;
 642
 643         lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);
 644
 645         return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
 646 }
 647
 648 static int pblk_set_provision(struct pblk *pblk, int nr_free_chks)
 649 {
 650         struct nvm_tgt_dev *dev = pblk->dev;
 651         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 652         struct pblk_line_meta *lm = &pblk->lm;
 653         struct nvm_geo *geo = &dev->geo;
 654         sector_t provisioned;
 655         int sec_meta, blk_meta, clba;
 656         int minimum;
 657
 658         if (geo->op == NVM_TARGET_DEFAULT_OP)
 659                 pblk->op = PBLK_DEFAULT_OP;
 660         else
 661                 pblk->op = geo->op;
 662
 663         minimum = pblk_get_min_chks(pblk);
 664         provisioned = nr_free_chks;
 665         provisioned *= (100 - pblk->op);
 666         sector_div(provisioned, 100);
 667
 668         if ((nr_free_chks - provisioned) < minimum) {
 669                 if (geo->op != NVM_TARGET_DEFAULT_OP) {
 670                         pblk_err(pblk, "OP too small to create a sane instance\n");
 671                         return -EINTR;
 672                 }
 673
 674                 /* If the user did not specify an OP value, and PBLK_DEFAULT_OP
 675                  * is not enough, calculate and set sane value
 676                  */
 677
 678                 provisioned = nr_free_chks - minimum;
 679                 pblk->op =  (100 * minimum) / nr_free_chks;
 680                 pblk_info(pblk, "Default OP insufficient, adjusting OP to %d\n",
 681                                 pblk->op);
 682         }
 683
 684         pblk->op_blks = nr_free_chks - provisioned;
 685
 686         /* Internally pblk manages all free blocks, but all calculations based
 687          * on user capacity consider only provisioned blocks
 688          */
 689         pblk->rl.total_blocks = nr_free_chks;
 690
 691         /* Consider sectors used for metadata */
 692         sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
 693         blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);
 694
 695         clba = (geo->clba / pblk->min_write_pgs) * pblk->min_write_pgs_data;
 696         pblk->capacity = (provisioned - blk_meta) * clba;
 697
 698         atomic_set(&pblk->rl.free_blocks, nr_free_chks);
 699         atomic_set(&pblk->rl.free_user_blocks, nr_free_chks);
 700
 701         return 0;
 702 }
 703
 704 static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
 705                                    struct nvm_chk_meta *meta)
 706 {
 707         struct nvm_tgt_dev *dev = pblk->dev;
 708         struct nvm_geo *geo = &dev->geo;
 709         struct pblk_line_meta *lm = &pblk->lm;
 710         int i, nr_bad_chks = 0;
 711
 712         for (i = 0; i < lm->blk_per_line; i++) {
 713                 struct pblk_lun *rlun = &pblk->luns[i];
 714                 struct nvm_chk_meta *chunk;
 715                 struct nvm_chk_meta *chunk_meta;
 716                 struct ppa_addr ppa;
 717                 int pos;
 718
 719                 ppa = rlun->bppa;
 720                 pos = pblk_ppa_to_pos(geo, ppa);
 721                 chunk = &line->chks[pos];
 722
 723                 ppa.m.chk = line->id;
 724                 chunk_meta = pblk_chunk_get_off(pblk, meta, ppa);
 725
 726                 chunk->state = chunk_meta->state;
 727                 chunk->type = chunk_meta->type;
 728                 chunk->wi = chunk_meta->wi;
 729                 chunk->slba = chunk_meta->slba;
 730                 chunk->cnlb = chunk_meta->cnlb;
 731                 chunk->wp = chunk_meta->wp;
 732
 733                 trace_pblk_chunk_state(pblk_disk_name(pblk), &ppa,
 734                                         chunk->state);
 735
 736                 if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
 737                         WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
 738                         continue;
 739                 }
 740
 741                 if (!(chunk->state & NVM_CHK_ST_OFFLINE))
 742                         continue;
 743
 744                 set_bit(pos, line->blk_bitmap);
 745                 nr_bad_chks++;
 746         }
 747
 748         return nr_bad_chks;
 749 }
 750
 751 static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
 752                                  void *chunk_meta, int line_id)
 753 {
 754         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 755         struct pblk_line_meta *lm = &pblk->lm;
 756         long nr_bad_chks, chk_in_line;
 757
 758         line->pblk = pblk;
 759         line->id = line_id;
 760         line->type = PBLK_LINETYPE_FREE;
 761         line->state = PBLK_LINESTATE_NEW;
 762         line->gc_group = PBLK_LINEGC_NONE;
 763         line->vsc = &l_mg->vsc_list[line_id];
 764         spin_lock_init(&line->lock);
 765
 766         nr_bad_chks = pblk_setup_line_meta_chk(pblk, line, chunk_meta);
 767
 768         chk_in_line = lm->blk_per_line - nr_bad_chks;
 769         if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
 770                                         chk_in_line < lm->min_blk_line) {
 771                 line->state = PBLK_LINESTATE_BAD;
 772                 list_add_tail(&line->list, &l_mg->bad_list);
 773                 return 0;
 774         }
 775
 776         atomic_set(&line->blk_in_line, chk_in_line);
 777         list_add_tail(&line->list, &l_mg->free_list);
 778         l_mg->nr_free_lines++;
 779
 780         return chk_in_line;
 781 }
 782
 783 static int pblk_alloc_line_meta(struct pblk *pblk, struct pblk_line *line)
 784 {
 785         struct pblk_line_meta *lm = &pblk->lm;
 786
 787         line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
 788         if (!line->blk_bitmap)
 789                 return -ENOMEM;
 790
 791         line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
 792         if (!line->erase_bitmap)
 793                 goto free_blk_bitmap;
 794
 795
 796         line->chks = kmalloc_array(lm->blk_per_line,
 797                                    sizeof(struct nvm_chk_meta), GFP_KERNEL);
 798         if (!line->chks)
 799                 goto free_erase_bitmap;
 800
 801         line->w_err_gc = kzalloc(sizeof(struct pblk_w_err_gc), GFP_KERNEL);
 802         if (!line->w_err_gc)
 803                 goto free_chks;
 804
 805         return 0;
 806
 807 free_chks:
 808         kfree(line->chks);
 809 free_erase_bitmap:
 810         kfree(line->erase_bitmap);
 811 free_blk_bitmap:
 812         kfree(line->blk_bitmap);
 813         return -ENOMEM;
 814 }
 815
 816 static int pblk_line_mg_init(struct pblk *pblk)
 817 {
 818         struct nvm_tgt_dev *dev = pblk->dev;
 819         struct nvm_geo *geo = &dev->geo;
 820         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 821         struct pblk_line_meta *lm = &pblk->lm;
 822         int i, bb_distance;
 823
 824         l_mg->nr_lines = geo->num_chk;
 825         l_mg->log_line = l_mg->data_line = NULL;
 826         l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
 827         l_mg->nr_free_lines = 0;
 828         bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
 829
 830         INIT_LIST_HEAD(&l_mg->free_list);
 831         INIT_LIST_HEAD(&l_mg->corrupt_list);
 832         INIT_LIST_HEAD(&l_mg->bad_list);
 833         INIT_LIST_HEAD(&l_mg->gc_full_list);
 834         INIT_LIST_HEAD(&l_mg->gc_high_list);
 835         INIT_LIST_HEAD(&l_mg->gc_mid_list);
 836         INIT_LIST_HEAD(&l_mg->gc_low_list);
 837         INIT_LIST_HEAD(&l_mg->gc_empty_list);
 838         INIT_LIST_HEAD(&l_mg->gc_werr_list);
 839
 840         INIT_LIST_HEAD(&l_mg->emeta_list);
 841
 842         l_mg->gc_lists[0] = &l_mg->gc_werr_list;
 843         l_mg->gc_lists[1] = &l_mg->gc_high_list;
 844         l_mg->gc_lists[2] = &l_mg->gc_mid_list;
 845         l_mg->gc_lists[3] = &l_mg->gc_low_list;
 846
 847         spin_lock_init(&l_mg->free_lock);
 848         spin_lock_init(&l_mg->close_lock);
 849         spin_lock_init(&l_mg->gc_lock);
 850
 851         l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
 852         if (!l_mg->vsc_list)
 853                 goto fail;
 854
 855         l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
 856         if (!l_mg->bb_template)
 857                 goto fail_free_vsc_list;
 858
 859         l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
 860         if (!l_mg->bb_aux)
 861                 goto fail_free_bb_template;
 862
 863         /* smeta is always small enough to fit on a kmalloc memory allocation,
 864          * emeta depends on the number of LUNs allocated to the pblk instance
 865          */
 866         for (i = 0; i < PBLK_DATA_LINES; i++) {
 867                 l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
 868                 if (!l_mg->sline_meta[i])
 869                         goto fail_free_smeta;
 870         }
 871
 872         l_mg->bitmap_cache = kmem_cache_create("pblk_lm_bitmap",
 873                         lm->sec_bitmap_len, 0, 0, NULL);
 874         if (!l_mg->bitmap_cache)
 875                 goto fail_free_smeta;
 876
 877         /* the bitmap pool is used for both valid and map bitmaps */
 878         l_mg->bitmap_pool = mempool_create_slab_pool(PBLK_DATA_LINES * 2,
 879                                 l_mg->bitmap_cache);
 880         if (!l_mg->bitmap_pool)
 881                 goto fail_destroy_bitmap_cache;
 882
 883         /* emeta allocates three different buffers for managing metadata with
 884          * in-memory and in-media layouts
 885          */
 886         for (i = 0; i < PBLK_DATA_LINES; i++) {
 887                 struct pblk_emeta *emeta;
 888
 889                 emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
 890                 if (!emeta)
 891                         goto fail_free_emeta;
 892
 893                 emeta->buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
 894                 if (!emeta->buf) {
 895                         kfree(emeta);
 896                         goto fail_free_emeta;
 897                 }
 898
 899                 emeta->nr_entries = lm->emeta_sec[0];
 900                 l_mg->eline_meta[i] = emeta;
 901         }
 902
 903         for (i = 0; i < l_mg->nr_lines; i++)
 904                 l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
 905
 906         bb_distance = (geo->all_luns) * geo->ws_opt;
 907         for (i = 0; i < lm->sec_per_line; i += bb_distance)
 908                 bitmap_set(l_mg->bb_template, i, geo->ws_opt);
 909
 910         return 0;
 911
 912 fail_free_emeta:
 913         while (--i >= 0) {
 914                 kvfree(l_mg->eline_meta[i]->buf);
 915                 kfree(l_mg->eline_meta[i]);
 916         }
 917
 918         mempool_destroy(l_mg->bitmap_pool);
 919 fail_destroy_bitmap_cache:
 920         kmem_cache_destroy(l_mg->bitmap_cache);
 921 fail_free_smeta:
 922         for (i = 0; i < PBLK_DATA_LINES; i++)
 923                 kfree(l_mg->sline_meta[i]);
 924         kfree(l_mg->bb_aux);
 925 fail_free_bb_template:
 926         kfree(l_mg->bb_template);
 927 fail_free_vsc_list:
 928         kfree(l_mg->vsc_list);
 929 fail:
 930         return -ENOMEM;
 931 }
 932
 933 static int pblk_line_meta_init(struct pblk *pblk)
 934 {
 935         struct nvm_tgt_dev *dev = pblk->dev;
 936         struct nvm_geo *geo = &dev->geo;
 937         struct pblk_line_meta *lm = &pblk->lm;
 938         unsigned int smeta_len, emeta_len;
 939         int i;
 940
 941         lm->sec_per_line = geo->clba * geo->all_luns;
 942         lm->blk_per_line = geo->all_luns;
 943         lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
 944         lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
 945         lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
 946         lm->mid_thrs = lm->sec_per_line / 2;
 947         lm->high_thrs = lm->sec_per_line / 4;
 948         lm->meta_distance = (geo->all_luns / 2) * pblk->min_write_pgs;
 949
 950         /* Calculate necessary pages for smeta. See comment over struct
 951          * line_smeta definition
 952          */
 953         i = 1;
 954 add_smeta_page:
 955         lm->smeta_sec = i * geo->ws_opt;
 956         lm->smeta_len = lm->smeta_sec * geo->csecs;
 957
 958         smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
 959         if (smeta_len > lm->smeta_len) {
 960                 i++;
 961                 goto add_smeta_page;
 962         }
 963
 964         /* Calculate necessary pages for emeta. See comment over struct
 965          * line_emeta definition
 966          */
 967         i = 1;
 968 add_emeta_page:
 969         lm->emeta_sec[0] = i * geo->ws_opt;
 970         lm->emeta_len[0] = lm->emeta_sec[0] * geo->csecs;
 971
 972         emeta_len = calc_emeta_len(pblk);
 973         if (emeta_len > lm->emeta_len[0]) {
 974                 i++;
 975                 goto add_emeta_page;
 976         }
 977
 978         lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;
 979
 980         lm->min_blk_line = 1;
 981         if (geo->all_luns > 1)
 982                 lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
 983                                         lm->emeta_sec[0], geo->clba);
 984
 985         if (lm->min_blk_line > lm->blk_per_line) {
 986                 pblk_err(pblk, "config. not supported. Min. LUN in line:%d\n",
 987                                                         lm->blk_per_line);
 988                 return -EINVAL;
 989         }
 990
 991         return 0;
 992 }
 993
 994 static int pblk_lines_init(struct pblk *pblk)
 995 {
 996         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 997         struct pblk_line *line;
 998         void *chunk_meta;
 999         int nr_free_chks = 0;
1000         int i, ret;
1001
1002         ret = pblk_line_meta_init(pblk);
1003         if (ret)
1004                 return ret;
1005
1006         ret = pblk_line_mg_init(pblk);
1007         if (ret)
1008                 return ret;
1009
1010         ret = pblk_luns_init(pblk);
1011         if (ret)
1012                 goto fail_free_meta;
1013
1014         chunk_meta = pblk_get_chunk_meta(pblk);
1015         if (IS_ERR(chunk_meta)) {
1016                 ret = PTR_ERR(chunk_meta);
1017                 goto fail_free_luns;
1018         }
1019
1020         pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
1021                                                                 GFP_KERNEL);
1022         if (!pblk->lines) {
1023                 ret = -ENOMEM;
1024                 goto fail_free_chunk_meta;
1025         }
1026
1027         for (i = 0; i < l_mg->nr_lines; i++) {
1028                 line = &pblk->lines[i];
1029
1030                 ret = pblk_alloc_line_meta(pblk, line);
1031                 if (ret)
1032                         goto fail_free_lines;
1033
1034                 nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
1035
1036                 trace_pblk_line_state(pblk_disk_name(pblk), line->id,
1037                                                                 line->state);
1038         }
1039
1040         if (!nr_free_chks) {
1041                 pblk_err(pblk, "too many bad blocks prevent for sane instance\n");
1042                 ret = -EINTR;
1043                 goto fail_free_lines;
1044         }
1045
1046         ret = pblk_set_provision(pblk, nr_free_chks);
1047         if (ret)
1048                 goto fail_free_lines;
1049
1050         vfree(chunk_meta);
1051         return 0;
1052
1053 fail_free_lines:
1054         while (--i >= 0)
1055                 pblk_line_meta_free(l_mg, &pblk->lines[i]);
1056         kfree(pblk->lines);
1057 fail_free_chunk_meta:
1058         vfree(chunk_meta);
1059 fail_free_luns:
1060         kfree(pblk->luns);
1061 fail_free_meta:
1062         pblk_line_mg_free(pblk);
1063
1064         return ret;
1065 }
1066
1067 static int pblk_writer_init(struct pblk *pblk)
1068 {
1069         pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
1070         if (IS_ERR(pblk->writer_ts)) {
1071                 int err = PTR_ERR(pblk->writer_ts);
1072
1073                 if (err != -EINTR)
1074                         pblk_err(pblk, "could not allocate writer kthread (%d)\n",
1075                                         err);
1076                 return err;
1077         }
1078
1079         timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
1080         mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
1081
1082         return 0;
1083 }
1084
1085 static void pblk_writer_stop(struct pblk *pblk)
1086 {
1087         /* The pipeline must be stopped and the write buffer emptied before the
1088          * write thread is stopped
1089          */
1090         WARN(pblk_rb_read_count(&pblk->rwb),
1091                         "Stopping not fully persisted write buffer\n");
1092
1093         WARN(pblk_rb_sync_count(&pblk->rwb),
1094                         "Stopping not fully synced write buffer\n");
1095
1096         del_timer_sync(&pblk->wtimer);
1097         if (pblk->writer_ts)
1098                 kthread_stop(pblk->writer_ts);
1099 }
1100
1101 static void pblk_free(struct pblk *pblk)
1102 {
1103         pblk_lines_free(pblk);
1104         pblk_l2p_free(pblk);
1105         pblk_rwb_free(pblk);
1106         pblk_core_free(pblk);
1107
1108         kfree(pblk);
1109 }
1110
1111 static void pblk_tear_down(struct pblk *pblk, bool graceful)
1112 {
1113         if (graceful)
1114                 __pblk_pipeline_flush(pblk);
1115         __pblk_pipeline_stop(pblk);
1116         pblk_writer_stop(pblk);
1117         pblk_rb_sync_l2p(&pblk->rwb);
1118         pblk_rl_free(&pblk->rl);
1119
1120         pblk_debug(pblk, "consistent tear down (graceful:%d)\n", graceful);
1121 }
1122
1123 static void pblk_exit(void *private, bool graceful)
1124 {
1125         struct pblk *pblk = private;
1126
1127         pblk_gc_exit(pblk, graceful);
1128         pblk_tear_down(pblk, graceful);
1129
1130 #ifdef CONFIG_NVM_PBLK_DEBUG
1131         pblk_info(pblk, "exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
1132 #endif
1133
1134         pblk_free(pblk);
1135 }
1136
1137 static sector_t pblk_capacity(void *private)
1138 {
1139         struct pblk *pblk = private;
1140
1141         return pblk->capacity * NR_PHY_IN_LOG;
1142 }
1143
1144 static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
1145                        int flags)
1146 {
1147         struct nvm_geo *geo = &dev->geo;
1148         struct request_queue *bqueue = dev->q;
1149         struct request_queue *tqueue = tdisk->queue;
1150         struct pblk *pblk;
1151         int ret;
1152
1153         pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
1154         if (!pblk)
1155                 return ERR_PTR(-ENOMEM);
1156
1157         pblk->dev = dev;
1158         pblk->disk = tdisk;
1159         pblk->state = PBLK_STATE_RUNNING;
1160         trace_pblk_state(pblk_disk_name(pblk), pblk->state);
1161         pblk->gc.gc_enabled = 0;
1162
1163         if (!(geo->version == NVM_OCSSD_SPEC_12 ||
1164                                         geo->version == NVM_OCSSD_SPEC_20)) {
1165                 pblk_err(pblk, "OCSSD version not supported (%u)\n",
1166                                                         geo->version);
1167                 kfree(pblk);
1168                 return ERR_PTR(-EINVAL);
1169         }
1170
1171         if (geo->ext) {
1172                 pblk_err(pblk, "extended metadata not supported\n");
1173                 kfree(pblk);
1174                 return ERR_PTR(-EINVAL);
1175         }
1176
1177         spin_lock_init(&pblk->resubmit_lock);
1178         spin_lock_init(&pblk->trans_lock);
1179         spin_lock_init(&pblk->lock);
1180
1181 #ifdef CONFIG_NVM_PBLK_DEBUG
1182         atomic_long_set(&pblk->inflight_writes, 0);
1183         atomic_long_set(&pblk->padded_writes, 0);
1184         atomic_long_set(&pblk->padded_wb, 0);
1185         atomic_long_set(&pblk->req_writes, 0);
1186         atomic_long_set(&pblk->sub_writes, 0);
1187         atomic_long_set(&pblk->sync_writes, 0);
1188         atomic_long_set(&pblk->inflight_reads, 0);
1189         atomic_long_set(&pblk->cache_reads, 0);
1190         atomic_long_set(&pblk->sync_reads, 0);
1191         atomic_long_set(&pblk->recov_writes, 0);
1192         atomic_long_set(&pblk->recov_writes, 0);
1193         atomic_long_set(&pblk->recov_gc_writes, 0);
1194         atomic_long_set(&pblk->recov_gc_reads, 0);
1195 #endif
1196
1197         atomic_long_set(&pblk->read_failed, 0);
1198         atomic_long_set(&pblk->read_empty, 0);
1199         atomic_long_set(&pblk->read_high_ecc, 0);
1200         atomic_long_set(&pblk->read_failed_gc, 0);
1201         atomic_long_set(&pblk->write_failed, 0);
1202         atomic_long_set(&pblk->erase_failed, 0);
1203
1204         ret = pblk_core_init(pblk);
1205         if (ret) {
1206                 pblk_err(pblk, "could not initialize core\n");
1207                 goto fail;
1208         }
1209
1210         ret = pblk_lines_init(pblk);
1211         if (ret) {
1212                 pblk_err(pblk, "could not initialize lines\n");
1213                 goto fail_free_core;
1214         }
1215
1216         ret = pblk_rwb_init(pblk);
1217         if (ret) {
1218                 pblk_err(pblk, "could not initialize write buffer\n");
1219                 goto fail_free_lines;
1220         }
1221
1222         ret = pblk_l2p_init(pblk, flags & NVM_TARGET_FACTORY);
1223         if (ret) {
1224                 pblk_err(pblk, "could not initialize maps\n");
1225                 goto fail_free_rwb;
1226         }
1227
1228         ret = pblk_writer_init(pblk);
1229         if (ret) {
1230                 if (ret != -EINTR)
1231                         pblk_err(pblk, "could not initialize write thread\n");
1232                 goto fail_free_l2p;
1233         }
1234
1235         ret = pblk_gc_init(pblk);
1236         if (ret) {
1237                 pblk_err(pblk, "could not initialize gc\n");
1238                 goto fail_stop_writer;
1239         }
1240
1241         /* inherit the size from the underlying device */
1242         blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
1243         blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));
1244
1245         blk_queue_write_cache(tqueue, true, false);
1246
1247         tqueue->limits.discard_granularity = geo->clba * geo->csecs;
1248         tqueue->limits.discard_alignment = 0;
1249         blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
1250         blk_queue_flag_set(QUEUE_FLAG_DISCARD, tqueue);
1251
1252         pblk_info(pblk, "luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
1253                         geo->all_luns, pblk->l_mg.nr_lines,
1254                         (unsigned long long)pblk->capacity,
1255                         pblk->rwb.nr_entries);
1256
1257         wake_up_process(pblk->writer_ts);
1258
1259         /* Check if we need to start GC */
1260         pblk_gc_should_kick(pblk);
1261
1262         return pblk;
1263
1264 fail_stop_writer:
1265         pblk_writer_stop(pblk);
1266 fail_free_l2p:
1267         pblk_l2p_free(pblk);
1268 fail_free_rwb:
1269         pblk_rwb_free(pblk);
1270 fail_free_lines:
1271         pblk_lines_free(pblk);
1272 fail_free_core:
1273         pblk_core_free(pblk);
1274 fail:
1275         kfree(pblk);
1276         return ERR_PTR(ret);
1277 }
1278
1279 /* physical block device target */
1280 static struct nvm_tgt_type tt_pblk = {
1281         .name           = "pblk",
1282         .version        = {1, 0, 0},
1283
1284         .make_rq        = pblk_make_rq,
1285         .capacity       = pblk_capacity,
1286
1287         .init           = pblk_init,
1288         .exit           = pblk_exit,
1289
1290         .sysfs_init     = pblk_sysfs_init,
1291         .sysfs_exit     = pblk_sysfs_exit,
1292         .owner          = THIS_MODULE,
1293 };
1294
1295 static int __init pblk_module_init(void)
1296 {
1297         int ret;
1298
1299         ret = bioset_init(&pblk_bio_set, BIO_POOL_SIZE, 0, 0);
1300         if (ret)
1301                 return ret;
1302         ret = nvm_register_tgt_type(&tt_pblk);
1303         if (ret)
1304                 bioset_exit(&pblk_bio_set);
1305         return ret;
1306 }
1307
1308 static void pblk_module_exit(void)
1309 {
1310         bioset_exit(&pblk_bio_set);
1311         nvm_unregister_tgt_type(&tt_pblk);
1312 }
1313
1314 module_init(pblk_module_init);
1315 module_exit(pblk_module_exit);
1316 MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
1317 MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
1318 MODULE_LICENSE("GPL v2");
1319 MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");