drivers/lightnvm/pblk-init.c

   1 /*
   2  * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
   3  * Copyright (C) 2016 CNEX Labs
   4  * Initial release: Javier Gonzalez <javier@cnexlabs.com>
   5  *                  Matias Bjorling <matias@cnexlabs.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License version
   9  * 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * Implementation of a physical block-device target for Open-channel SSDs.
  17  *
  18  * pblk-init.c - pblk's initialization.
  19  */
  20
  21 #include "pblk.h"
  22
  23 static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
  24                                 *pblk_w_rq_cache;
  25 static DECLARE_RWSEM(pblk_lock);
  26 struct bio_set pblk_bio_set;
  27
  28 static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
  29                           struct bio *bio)
  30 {
  31         int ret;
  32
  33         /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
  34          * constraint. Writes can be of arbitrary size.
  35          */
  36         if (bio_data_dir(bio) == READ) {
  37                 blk_queue_split(q, &bio);
  38                 ret = pblk_submit_read(pblk, bio);
  39                 if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
  40                         bio_put(bio);
  41
  42                 return ret;
  43         }
  44
  45         /* Prevent deadlock in the case of a modest LUN configuration and large
  46          * user I/Os. Unless stalled, the rate limiter leaves at least 256KB
  47          * available for user I/O.
  48          */
  49         if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
  50                 blk_queue_split(q, &bio);
  51
  52         return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
  53 }
  54
  55 static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
  56 {
  57         struct pblk *pblk = q->queuedata;
  58
  59         if (bio_op(bio) == REQ_OP_DISCARD) {
  60                 pblk_discard(pblk, bio);
  61                 if (!(bio->bi_opf & REQ_PREFLUSH)) {
  62                         bio_endio(bio);
  63                         return BLK_QC_T_NONE;
  64                 }
  65         }
  66
  67         switch (pblk_rw_io(q, pblk, bio)) {
  68         case NVM_IO_ERR:
  69                 bio_io_error(bio);
  70                 break;
  71         case NVM_IO_DONE:
  72                 bio_endio(bio);
  73                 break;
  74         }
  75
  76         return BLK_QC_T_NONE;
  77 }
  78
  79 static size_t pblk_trans_map_size(struct pblk *pblk)
  80 {
  81         int entry_size = 8;
  82
  83         if (pblk->addrf_len < 32)
  84                 entry_size = 4;
  85
  86         return entry_size * pblk->rl.nr_secs;
  87 }
  88
  89 #ifdef CONFIG_NVM_DEBUG
  90 static u32 pblk_l2p_crc(struct pblk *pblk)
  91 {
  92         size_t map_size;
  93         u32 crc = ~(u32)0;
  94
  95         map_size = pblk_trans_map_size(pblk);
  96         crc = crc32_le(crc, pblk->trans_map, map_size);
  97         return crc;
  98 }
  99 #endif
 100
 101 static void pblk_l2p_free(struct pblk *pblk)
 102 {
 103         vfree(pblk->trans_map);
 104 }
 105
 106 static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
 107 {
 108         struct pblk_line *line = NULL;
 109
 110         if (factory_init) {
 111                 pblk_setup_uuid(pblk);
 112         } else {
 113                 line = pblk_recov_l2p(pblk);
 114                 if (IS_ERR(line)) {
 115                         pr_err("pblk: could not recover l2p table\n");
 116                         return -EFAULT;
 117                 }
 118         }
 119
 120 #ifdef CONFIG_NVM_DEBUG
 121         pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
 122 #endif
 123
 124         /* Free full lines directly as GC has not been started yet */
 125         pblk_gc_free_full_lines(pblk);
 126
 127         if (!line) {
 128                 /* Configure next line for user data */
 129                 line = pblk_line_get_first_data(pblk);
 130                 if (!line) {
 131                         pr_err("pblk: line list corrupted\n");
 132                         return -EFAULT;
 133                 }
 134         }
 135
 136         return 0;
 137 }
 138
 139 static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
 140 {
 141         sector_t i;
 142         struct ppa_addr ppa;
 143         size_t map_size;
 144
 145         map_size = pblk_trans_map_size(pblk);
 146         pblk->trans_map = vmalloc(map_size);
 147         if (!pblk->trans_map)
 148                 return -ENOMEM;
 149
 150         pblk_ppa_set_empty(&ppa);
 151
 152         for (i = 0; i < pblk->rl.nr_secs; i++)
 153                 pblk_trans_map_set(pblk, i, ppa);
 154
 155         return pblk_l2p_recover(pblk, factory_init);
 156 }
 157
 158 static void pblk_rwb_free(struct pblk *pblk)
 159 {
 160         if (pblk_rb_tear_down_check(&pblk->rwb))
 161                 pr_err("pblk: write buffer error on tear down\n");
 162
 163         pblk_rb_data_free(&pblk->rwb);
 164         vfree(pblk_rb_entries_ref(&pblk->rwb));
 165 }
 166
 167 static int pblk_rwb_init(struct pblk *pblk)
 168 {
 169         struct nvm_tgt_dev *dev = pblk->dev;
 170         struct nvm_geo *geo = &dev->geo;
 171         struct pblk_rb_entry *entries;
 172         unsigned long nr_entries;
 173         unsigned int power_size, power_seg_sz;
 174
 175         nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer);
 176
 177         entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry));
 178         if (!entries)
 179                 return -ENOMEM;
 180
 181         power_size = get_count_order(nr_entries);
 182         power_seg_sz = get_count_order(geo->csecs);
 183
 184         return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
 185 }
 186
 187 /* Minimum pages needed within a lun */
 188 #define ADDR_POOL_SIZE 64
 189
 190 static int pblk_set_addrf_12(struct nvm_geo *geo, struct nvm_addrf_12 *dst)
 191 {
 192         struct nvm_addrf_12 *src = (struct nvm_addrf_12 *)&geo->addrf;
 193         int power_len;
 194
 195         /* Re-calculate channel and lun format to adapt to configuration */
 196         power_len = get_count_order(geo->num_ch);
 197         if (1 << power_len != geo->num_ch) {
 198                 pr_err("pblk: supports only power-of-two channel config.\n");
 199                 return -EINVAL;
 200         }
 201         dst->ch_len = power_len;
 202
 203         power_len = get_count_order(geo->num_lun);
 204         if (1 << power_len != geo->num_lun) {
 205                 pr_err("pblk: supports only power-of-two LUN config.\n");
 206                 return -EINVAL;
 207         }
 208         dst->lun_len = power_len;
 209
 210         dst->blk_len = src->blk_len;
 211         dst->pg_len = src->pg_len;
 212         dst->pln_len = src->pln_len;
 213         dst->sec_len = src->sec_len;
 214
 215         dst->sec_offset = 0;
 216         dst->pln_offset = dst->sec_len;
 217         dst->ch_offset = dst->pln_offset + dst->pln_len;
 218         dst->lun_offset = dst->ch_offset + dst->ch_len;
 219         dst->pg_offset = dst->lun_offset + dst->lun_len;
 220         dst->blk_offset = dst->pg_offset + dst->pg_len;
 221
 222         dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
 223         dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
 224         dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
 225         dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
 226         dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
 227         dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;
 228
 229         return dst->blk_offset + src->blk_len;
 230 }
 231
 232 static int pblk_set_addrf_20(struct nvm_geo *geo, struct nvm_addrf *adst,
 233                              struct pblk_addrf *udst)
 234 {
 235         struct nvm_addrf *src = &geo->addrf;
 236
 237         adst->ch_len = get_count_order(geo->num_ch);
 238         adst->lun_len = get_count_order(geo->num_lun);
 239         adst->chk_len = src->chk_len;
 240         adst->sec_len = src->sec_len;
 241
 242         adst->sec_offset = 0;
 243         adst->ch_offset = adst->sec_len;
 244         adst->lun_offset = adst->ch_offset + adst->ch_len;
 245         adst->chk_offset = adst->lun_offset + adst->lun_len;
 246
 247         adst->sec_mask = ((1ULL << adst->sec_len) - 1) << adst->sec_offset;
 248         adst->chk_mask = ((1ULL << adst->chk_len) - 1) << adst->chk_offset;
 249         adst->lun_mask = ((1ULL << adst->lun_len) - 1) << adst->lun_offset;
 250         adst->ch_mask = ((1ULL << adst->ch_len) - 1) << adst->ch_offset;
 251
 252         udst->sec_stripe = geo->ws_opt;
 253         udst->ch_stripe = geo->num_ch;
 254         udst->lun_stripe = geo->num_lun;
 255
 256         udst->sec_lun_stripe = udst->sec_stripe * udst->ch_stripe;
 257         udst->sec_ws_stripe = udst->sec_lun_stripe * udst->lun_stripe;
 258
 259         return adst->chk_offset + adst->chk_len;
 260 }
 261
 262 static int pblk_set_addrf(struct pblk *pblk)
 263 {
 264         struct nvm_tgt_dev *dev = pblk->dev;
 265         struct nvm_geo *geo = &dev->geo;
 266         int mod;
 267
 268         switch (geo->version) {
 269         case NVM_OCSSD_SPEC_12:
 270                 div_u64_rem(geo->clba, pblk->min_write_pgs, &mod);
 271                 if (mod) {
 272                         pr_err("pblk: bad configuration of sectors/pages\n");
 273                         return -EINVAL;
 274                 }
 275
 276                 pblk->addrf_len = pblk_set_addrf_12(geo, (void *)&pblk->addrf);
 277                 break;
 278         case NVM_OCSSD_SPEC_20:
 279                 pblk->addrf_len = pblk_set_addrf_20(geo, (void *)&pblk->addrf,
 280                                                                 &pblk->uaddrf);
 281                 break;
 282         default:
 283                 pr_err("pblk: OCSSD revision not supported (%d)\n",
 284                                                                 geo->version);
 285                 return -EINVAL;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int pblk_init_global_caches(struct pblk *pblk)
 292 {
 293         down_write(&pblk_lock);
 294         pblk_ws_cache = kmem_cache_create("pblk_blk_ws",
 295                                 sizeof(struct pblk_line_ws), 0, 0, NULL);
 296         if (!pblk_ws_cache) {
 297                 up_write(&pblk_lock);
 298                 return -ENOMEM;
 299         }
 300
 301         pblk_rec_cache = kmem_cache_create("pblk_rec",
 302                                 sizeof(struct pblk_rec_ctx), 0, 0, NULL);
 303         if (!pblk_rec_cache) {
 304                 kmem_cache_destroy(pblk_ws_cache);
 305                 up_write(&pblk_lock);
 306                 return -ENOMEM;
 307         }
 308
 309         pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
 310                                 0, 0, NULL);
 311         if (!pblk_g_rq_cache) {
 312                 kmem_cache_destroy(pblk_ws_cache);
 313                 kmem_cache_destroy(pblk_rec_cache);
 314                 up_write(&pblk_lock);
 315                 return -ENOMEM;
 316         }
 317
 318         pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
 319                                 0, 0, NULL);
 320         if (!pblk_w_rq_cache) {
 321                 kmem_cache_destroy(pblk_ws_cache);
 322                 kmem_cache_destroy(pblk_rec_cache);
 323                 kmem_cache_destroy(pblk_g_rq_cache);
 324                 up_write(&pblk_lock);
 325                 return -ENOMEM;
 326         }
 327         up_write(&pblk_lock);
 328
 329         return 0;
 330 }
 331
 332 static void pblk_free_global_caches(struct pblk *pblk)
 333 {
 334         kmem_cache_destroy(pblk_ws_cache);
 335         kmem_cache_destroy(pblk_rec_cache);
 336         kmem_cache_destroy(pblk_g_rq_cache);
 337         kmem_cache_destroy(pblk_w_rq_cache);
 338 }
 339
 340 static int pblk_core_init(struct pblk *pblk)
 341 {
 342         struct nvm_tgt_dev *dev = pblk->dev;
 343         struct nvm_geo *geo = &dev->geo;
 344         int ret, max_write_ppas;
 345
 346         atomic64_set(&pblk->user_wa, 0);
 347         atomic64_set(&pblk->pad_wa, 0);
 348         atomic64_set(&pblk->gc_wa, 0);
 349         pblk->user_rst_wa = 0;
 350         pblk->pad_rst_wa = 0;
 351         pblk->gc_rst_wa = 0;
 352
 353         atomic64_set(&pblk->nr_flush, 0);
 354         pblk->nr_flush_rst = 0;
 355
 356         pblk->pgs_in_buffer = geo->mw_cunits * geo->all_luns;
 357
 358         pblk->min_write_pgs = geo->ws_opt * (geo->csecs / PAGE_SIZE);
 359         max_write_ppas = pblk->min_write_pgs * geo->all_luns;
 360         pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
 361         pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
 362
 363         if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
 364                 pr_err("pblk: vector list too big(%u > %u)\n",
 365                                 pblk->max_write_pgs, PBLK_MAX_REQ_ADDRS);
 366                 return -EINVAL;
 367         }
 368
 369         pblk->pad_dist = kzalloc((pblk->min_write_pgs - 1) * sizeof(atomic64_t),
 370                                                                 GFP_KERNEL);
 371         if (!pblk->pad_dist)
 372                 return -ENOMEM;
 373
 374         if (pblk_init_global_caches(pblk))
 375                 goto fail_free_pad_dist;
 376
 377         /* Internal bios can be at most the sectors signaled by the device. */
 378         ret = mempool_init_page_pool(&pblk->page_bio_pool, NVM_MAX_VLBA, 0);
 379         if (ret)
 380                 goto free_global_caches;
 381
 382         ret = mempool_init_slab_pool(&pblk->gen_ws_pool, PBLK_GEN_WS_POOL_SIZE,
 383                                      pblk_ws_cache);
 384         if (ret)
 385                 goto free_page_bio_pool;
 386
 387         ret = mempool_init_slab_pool(&pblk->rec_pool, geo->all_luns,
 388                                      pblk_rec_cache);
 389         if (ret)
 390                 goto free_gen_ws_pool;
 391
 392         ret = mempool_init_slab_pool(&pblk->r_rq_pool, geo->all_luns,
 393                                      pblk_g_rq_cache);
 394         if (ret)
 395                 goto free_rec_pool;
 396
 397         ret = mempool_init_slab_pool(&pblk->e_rq_pool, geo->all_luns,
 398                                      pblk_g_rq_cache);
 399         if (ret)
 400                 goto free_r_rq_pool;
 401
 402         ret = mempool_init_slab_pool(&pblk->w_rq_pool, geo->all_luns,
 403                                      pblk_w_rq_cache);
 404         if (ret)
 405                 goto free_e_rq_pool;
 406
 407         pblk->close_wq = alloc_workqueue("pblk-close-wq",
 408                         WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
 409         if (!pblk->close_wq)
 410                 goto free_w_rq_pool;
 411
 412         pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
 413                         WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
 414         if (!pblk->bb_wq)
 415                 goto free_close_wq;
 416
 417         pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
 418                         WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
 419         if (!pblk->r_end_wq)
 420                 goto free_bb_wq;
 421
 422         if (pblk_set_addrf(pblk))
 423                 goto free_r_end_wq;
 424
 425         INIT_LIST_HEAD(&pblk->compl_list);
 426
 427         return 0;
 428
 429 free_r_end_wq:
 430         destroy_workqueue(pblk->r_end_wq);
 431 free_bb_wq:
 432         destroy_workqueue(pblk->bb_wq);
 433 free_close_wq:
 434         destroy_workqueue(pblk->close_wq);
 435 free_w_rq_pool:
 436         mempool_exit(&pblk->w_rq_pool);
 437 free_e_rq_pool:
 438         mempool_exit(&pblk->e_rq_pool);
 439 free_r_rq_pool:
 440         mempool_exit(&pblk->r_rq_pool);
 441 free_rec_pool:
 442         mempool_exit(&pblk->rec_pool);
 443 free_gen_ws_pool:
 444         mempool_exit(&pblk->gen_ws_pool);
 445 free_page_bio_pool:
 446         mempool_exit(&pblk->page_bio_pool);
 447 free_global_caches:
 448         pblk_free_global_caches(pblk);
 449 fail_free_pad_dist:
 450         kfree(pblk->pad_dist);
 451         return -ENOMEM;
 452 }
 453
 454 static void pblk_core_free(struct pblk *pblk)
 455 {
 456         if (pblk->close_wq)
 457                 destroy_workqueue(pblk->close_wq);
 458
 459         if (pblk->r_end_wq)
 460                 destroy_workqueue(pblk->r_end_wq);
 461
 462         if (pblk->bb_wq)
 463                 destroy_workqueue(pblk->bb_wq);
 464
 465         mempool_exit(&pblk->page_bio_pool);
 466         mempool_exit(&pblk->gen_ws_pool);
 467         mempool_exit(&pblk->rec_pool);
 468         mempool_exit(&pblk->r_rq_pool);
 469         mempool_exit(&pblk->e_rq_pool);
 470         mempool_exit(&pblk->w_rq_pool);
 471
 472         pblk_free_global_caches(pblk);
 473         kfree(pblk->pad_dist);
 474 }
 475
 476 static void pblk_line_mg_free(struct pblk *pblk)
 477 {
 478         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 479         int i;
 480
 481         kfree(l_mg->bb_template);
 482         kfree(l_mg->bb_aux);
 483         kfree(l_mg->vsc_list);
 484
 485         for (i = 0; i < PBLK_DATA_LINES; i++) {
 486                 kfree(l_mg->sline_meta[i]);
 487                 pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
 488                 kfree(l_mg->eline_meta[i]);
 489         }
 490 }
 491
 492 static void pblk_line_meta_free(struct pblk_line *line)
 493 {
 494         kfree(line->blk_bitmap);
 495         kfree(line->erase_bitmap);
 496         kfree(line->chks);
 497 }
 498
 499 static void pblk_lines_free(struct pblk *pblk)
 500 {
 501         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 502         struct pblk_line *line;
 503         int i;
 504
 505         spin_lock(&l_mg->free_lock);
 506         for (i = 0; i < l_mg->nr_lines; i++) {
 507                 line = &pblk->lines[i];
 508
 509                 pblk_line_free(pblk, line);
 510                 pblk_line_meta_free(line);
 511         }
 512         spin_unlock(&l_mg->free_lock);
 513
 514         pblk_line_mg_free(pblk);
 515
 516         kfree(pblk->luns);
 517         kfree(pblk->lines);
 518 }
 519
 520 static int pblk_bb_get_tbl(struct nvm_tgt_dev *dev, struct pblk_lun *rlun,
 521                            u8 *blks, int nr_blks)
 522 {
 523         struct ppa_addr ppa;
 524         int ret;
 525
 526         ppa.ppa = 0;
 527         ppa.g.ch = rlun->bppa.g.ch;
 528         ppa.g.lun = rlun->bppa.g.lun;
 529
 530         ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
 531         if (ret)
 532                 return ret;
 533
 534         nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
 535         if (nr_blks < 0)
 536                 return -EIO;
 537
 538         return 0;
 539 }
 540
 541 static void *pblk_bb_get_meta(struct pblk *pblk)
 542 {
 543         struct nvm_tgt_dev *dev = pblk->dev;
 544         struct nvm_geo *geo = &dev->geo;
 545         u8 *meta;
 546         int i, nr_blks, blk_per_lun;
 547         int ret;
 548
 549         blk_per_lun = geo->num_chk * geo->pln_mode;
 550         nr_blks = blk_per_lun * geo->all_luns;
 551
 552         meta = kmalloc(nr_blks, GFP_KERNEL);
 553         if (!meta)
 554                 return ERR_PTR(-ENOMEM);
 555
 556         for (i = 0; i < geo->all_luns; i++) {
 557                 struct pblk_lun *rlun = &pblk->luns[i];
 558                 u8 *meta_pos = meta + i * blk_per_lun;
 559
 560                 ret = pblk_bb_get_tbl(dev, rlun, meta_pos, blk_per_lun);
 561                 if (ret) {
 562                         kfree(meta);
 563                         return ERR_PTR(-EIO);
 564                 }
 565         }
 566
 567         return meta;
 568 }
 569
 570 static void *pblk_chunk_get_meta(struct pblk *pblk)
 571 {
 572         struct nvm_tgt_dev *dev = pblk->dev;
 573         struct nvm_geo *geo = &dev->geo;
 574
 575         if (geo->version == NVM_OCSSD_SPEC_12)
 576                 return pblk_bb_get_meta(pblk);
 577         else
 578                 return pblk_chunk_get_info(pblk);
 579 }
 580
 581 static int pblk_luns_init(struct pblk *pblk)
 582 {
 583         struct nvm_tgt_dev *dev = pblk->dev;
 584         struct nvm_geo *geo = &dev->geo;
 585         struct pblk_lun *rlun;
 586         int i;
 587
 588         /* TODO: Implement unbalanced LUN support */
 589         if (geo->num_lun < 0) {
 590                 pr_err("pblk: unbalanced LUN config.\n");
 591                 return -EINVAL;
 592         }
 593
 594         pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
 595                                                                 GFP_KERNEL);
 596         if (!pblk->luns)
 597                 return -ENOMEM;
 598
 599         for (i = 0; i < geo->all_luns; i++) {
 600                 /* Stripe across channels */
 601                 int ch = i % geo->num_ch;
 602                 int lun_raw = i / geo->num_ch;
 603                 int lunid = lun_raw + ch * geo->num_lun;
 604
 605                 rlun = &pblk->luns[i];
 606                 rlun->bppa = dev->luns[lunid];
 607
 608                 sema_init(&rlun->wr_sem, 1);
 609         }
 610
 611         return 0;
 612 }
 613
 614 /* See comment over struct line_emeta definition */
 615 static unsigned int calc_emeta_len(struct pblk *pblk)
 616 {
 617         struct pblk_line_meta *lm = &pblk->lm;
 618         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 619         struct nvm_tgt_dev *dev = pblk->dev;
 620         struct nvm_geo *geo = &dev->geo;
 621
 622         /* Round to sector size so that lba_list starts on its own sector */
 623         lm->emeta_sec[1] = DIV_ROUND_UP(
 624                         sizeof(struct line_emeta) + lm->blk_bitmap_len +
 625                         sizeof(struct wa_counters), geo->csecs);
 626         lm->emeta_len[1] = lm->emeta_sec[1] * geo->csecs;
 627
 628         /* Round to sector size so that vsc_list starts on its own sector */
 629         lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
 630         lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
 631                         geo->csecs);
 632         lm->emeta_len[2] = lm->emeta_sec[2] * geo->csecs;
 633
 634         lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
 635                         geo->csecs);
 636         lm->emeta_len[3] = lm->emeta_sec[3] * geo->csecs;
 637
 638         lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);
 639
 640         return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
 641 }
 642
 643 static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
 644 {
 645         struct nvm_tgt_dev *dev = pblk->dev;
 646         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 647         struct pblk_line_meta *lm = &pblk->lm;
 648         struct nvm_geo *geo = &dev->geo;
 649         sector_t provisioned;
 650         int sec_meta, blk_meta;
 651
 652         if (geo->op == NVM_TARGET_DEFAULT_OP)
 653                 pblk->op = PBLK_DEFAULT_OP;
 654         else
 655                 pblk->op = geo->op;
 656
 657         provisioned = nr_free_blks;
 658         provisioned *= (100 - pblk->op);
 659         sector_div(provisioned, 100);
 660
 661         pblk->op_blks = nr_free_blks - provisioned;
 662
 663         /* Internally pblk manages all free blocks, but all calculations based
 664          * on user capacity consider only provisioned blocks
 665          */
 666         pblk->rl.total_blocks = nr_free_blks;
 667         pblk->rl.nr_secs = nr_free_blks * geo->clba;
 668
 669         /* Consider sectors used for metadata */
 670         sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
 671         blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);
 672
 673         pblk->capacity = (provisioned - blk_meta) * geo->clba;
 674
 675         atomic_set(&pblk->rl.free_blocks, nr_free_blks);
 676         atomic_set(&pblk->rl.free_user_blocks, nr_free_blks);
 677 }
 678
 679 static int pblk_setup_line_meta_12(struct pblk *pblk, struct pblk_line *line,
 680                                    void *chunk_meta)
 681 {
 682         struct nvm_tgt_dev *dev = pblk->dev;
 683         struct nvm_geo *geo = &dev->geo;
 684         struct pblk_line_meta *lm = &pblk->lm;
 685         int i, chk_per_lun, nr_bad_chks = 0;
 686
 687         chk_per_lun = geo->num_chk * geo->pln_mode;
 688
 689         for (i = 0; i < lm->blk_per_line; i++) {
 690                 struct pblk_lun *rlun = &pblk->luns[i];
 691                 struct nvm_chk_meta *chunk;
 692                 int pos = pblk_ppa_to_pos(geo, rlun->bppa);
 693                 u8 *lun_bb_meta = chunk_meta + pos * chk_per_lun;
 694
 695                 chunk = &line->chks[pos];
 696
 697                 /*
 698                  * In 1.2 spec. chunk state is not persisted by the device. Thus
 699                  * some of the values are reset each time pblk is instantiated.
 700                  */
 701                 if (lun_bb_meta[line->id] == NVM_BLK_T_FREE)
 702                         chunk->state =  NVM_CHK_ST_FREE;
 703                 else
 704                         chunk->state = NVM_CHK_ST_OFFLINE;
 705
 706                 chunk->type = NVM_CHK_TP_W_SEQ;
 707                 chunk->wi = 0;
 708                 chunk->slba = -1;
 709                 chunk->cnlb = geo->clba;
 710                 chunk->wp = 0;
 711
 712                 if (!(chunk->state & NVM_CHK_ST_OFFLINE))
 713                         continue;
 714
 715                 set_bit(pos, line->blk_bitmap);
 716                 nr_bad_chks++;
 717         }
 718
 719         return nr_bad_chks;
 720 }
 721
 722 static int pblk_setup_line_meta_20(struct pblk *pblk, struct pblk_line *line,
 723                                    struct nvm_chk_meta *meta)
 724 {
 725         struct nvm_tgt_dev *dev = pblk->dev;
 726         struct nvm_geo *geo = &dev->geo;
 727         struct pblk_line_meta *lm = &pblk->lm;
 728         int i, nr_bad_chks = 0;
 729
 730         for (i = 0; i < lm->blk_per_line; i++) {
 731                 struct pblk_lun *rlun = &pblk->luns[i];
 732                 struct nvm_chk_meta *chunk;
 733                 struct nvm_chk_meta *chunk_meta;
 734                 struct ppa_addr ppa;
 735                 int pos;
 736
 737                 ppa = rlun->bppa;
 738                 pos = pblk_ppa_to_pos(geo, ppa);
 739                 chunk = &line->chks[pos];
 740
 741                 ppa.m.chk = line->id;
 742                 chunk_meta = pblk_chunk_get_off(pblk, meta, ppa);
 743
 744                 chunk->state = chunk_meta->state;
 745                 chunk->type = chunk_meta->type;
 746                 chunk->wi = chunk_meta->wi;
 747                 chunk->slba = chunk_meta->slba;
 748                 chunk->cnlb = chunk_meta->cnlb;
 749                 chunk->wp = chunk_meta->wp;
 750
 751                 if (!(chunk->state & NVM_CHK_ST_OFFLINE))
 752                         continue;
 753
 754                 if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
 755                         WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
 756                         continue;
 757                 }
 758
 759                 set_bit(pos, line->blk_bitmap);
 760                 nr_bad_chks++;
 761         }
 762
 763         return nr_bad_chks;
 764 }
 765
 766 static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
 767                                  void *chunk_meta, int line_id)
 768 {
 769         struct nvm_tgt_dev *dev = pblk->dev;
 770         struct nvm_geo *geo = &dev->geo;
 771         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 772         struct pblk_line_meta *lm = &pblk->lm;
 773         long nr_bad_chks, chk_in_line;
 774
 775         line->pblk = pblk;
 776         line->id = line_id;
 777         line->type = PBLK_LINETYPE_FREE;
 778         line->state = PBLK_LINESTATE_NEW;
 779         line->gc_group = PBLK_LINEGC_NONE;
 780         line->vsc = &l_mg->vsc_list[line_id];
 781         spin_lock_init(&line->lock);
 782
 783         if (geo->version == NVM_OCSSD_SPEC_12)
 784                 nr_bad_chks = pblk_setup_line_meta_12(pblk, line, chunk_meta);
 785         else
 786                 nr_bad_chks = pblk_setup_line_meta_20(pblk, line, chunk_meta);
 787
 788         chk_in_line = lm->blk_per_line - nr_bad_chks;
 789         if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
 790                                         chk_in_line < lm->min_blk_line) {
 791                 line->state = PBLK_LINESTATE_BAD;
 792                 list_add_tail(&line->list, &l_mg->bad_list);
 793                 return 0;
 794         }
 795
 796         atomic_set(&line->blk_in_line, chk_in_line);
 797         list_add_tail(&line->list, &l_mg->free_list);
 798         l_mg->nr_free_lines++;
 799
 800         return chk_in_line;
 801 }
 802
 803 static int pblk_alloc_line_meta(struct pblk *pblk, struct pblk_line *line)
 804 {
 805         struct pblk_line_meta *lm = &pblk->lm;
 806
 807         line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
 808         if (!line->blk_bitmap)
 809                 return -ENOMEM;
 810
 811         line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
 812         if (!line->erase_bitmap) {
 813                 kfree(line->blk_bitmap);
 814                 return -ENOMEM;
 815         }
 816
 817         line->chks = kmalloc(lm->blk_per_line * sizeof(struct nvm_chk_meta),
 818                                                                 GFP_KERNEL);
 819         if (!line->chks) {
 820                 kfree(line->erase_bitmap);
 821                 kfree(line->blk_bitmap);
 822                 return -ENOMEM;
 823         }
 824
 825         return 0;
 826 }
 827
 828 static int pblk_line_mg_init(struct pblk *pblk)
 829 {
 830         struct nvm_tgt_dev *dev = pblk->dev;
 831         struct nvm_geo *geo = &dev->geo;
 832         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 833         struct pblk_line_meta *lm = &pblk->lm;
 834         int i, bb_distance;
 835
 836         l_mg->nr_lines = geo->num_chk;
 837         l_mg->log_line = l_mg->data_line = NULL;
 838         l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
 839         l_mg->nr_free_lines = 0;
 840         bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
 841
 842         INIT_LIST_HEAD(&l_mg->free_list);
 843         INIT_LIST_HEAD(&l_mg->corrupt_list);
 844         INIT_LIST_HEAD(&l_mg->bad_list);
 845         INIT_LIST_HEAD(&l_mg->gc_full_list);
 846         INIT_LIST_HEAD(&l_mg->gc_high_list);
 847         INIT_LIST_HEAD(&l_mg->gc_mid_list);
 848         INIT_LIST_HEAD(&l_mg->gc_low_list);
 849         INIT_LIST_HEAD(&l_mg->gc_empty_list);
 850
 851         INIT_LIST_HEAD(&l_mg->emeta_list);
 852
 853         l_mg->gc_lists[0] = &l_mg->gc_high_list;
 854         l_mg->gc_lists[1] = &l_mg->gc_mid_list;
 855         l_mg->gc_lists[2] = &l_mg->gc_low_list;
 856
 857         spin_lock_init(&l_mg->free_lock);
 858         spin_lock_init(&l_mg->close_lock);
 859         spin_lock_init(&l_mg->gc_lock);
 860
 861         l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
 862         if (!l_mg->vsc_list)
 863                 goto fail;
 864
 865         l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
 866         if (!l_mg->bb_template)
 867                 goto fail_free_vsc_list;
 868
 869         l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
 870         if (!l_mg->bb_aux)
 871                 goto fail_free_bb_template;
 872
 873         /* smeta is always small enough to fit on a kmalloc memory allocation,
 874          * emeta depends on the number of LUNs allocated to the pblk instance
 875          */
 876         for (i = 0; i < PBLK_DATA_LINES; i++) {
 877                 l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
 878                 if (!l_mg->sline_meta[i])
 879                         goto fail_free_smeta;
 880         }
 881
 882         /* emeta allocates three different buffers for managing metadata with
 883          * in-memory and in-media layouts
 884          */
 885         for (i = 0; i < PBLK_DATA_LINES; i++) {
 886                 struct pblk_emeta *emeta;
 887
 888                 emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
 889                 if (!emeta)
 890                         goto fail_free_emeta;
 891
 892                 if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
 893                         l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
 894
 895                         emeta->buf = vmalloc(lm->emeta_len[0]);
 896                         if (!emeta->buf) {
 897                                 kfree(emeta);
 898                                 goto fail_free_emeta;
 899                         }
 900
 901                         emeta->nr_entries = lm->emeta_sec[0];
 902                         l_mg->eline_meta[i] = emeta;
 903                 } else {
 904                         l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
 905
 906                         emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
 907                         if (!emeta->buf) {
 908                                 kfree(emeta);
 909                                 goto fail_free_emeta;
 910                         }
 911
 912                         emeta->nr_entries = lm->emeta_sec[0];
 913                         l_mg->eline_meta[i] = emeta;
 914                 }
 915         }
 916
 917         for (i = 0; i < l_mg->nr_lines; i++)
 918                 l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
 919
 920         bb_distance = (geo->all_luns) * geo->ws_opt;
 921         for (i = 0; i < lm->sec_per_line; i += bb_distance)
 922                 bitmap_set(l_mg->bb_template, i, geo->ws_opt);
 923
 924         return 0;
 925
 926 fail_free_emeta:
 927         while (--i >= 0) {
 928                 if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
 929                         vfree(l_mg->eline_meta[i]->buf);
 930                 else
 931                         kfree(l_mg->eline_meta[i]->buf);
 932                 kfree(l_mg->eline_meta[i]);
 933         }
 934 fail_free_smeta:
 935         for (i = 0; i < PBLK_DATA_LINES; i++)
 936                 kfree(l_mg->sline_meta[i]);
 937         kfree(l_mg->bb_aux);
 938 fail_free_bb_template:
 939         kfree(l_mg->bb_template);
 940 fail_free_vsc_list:
 941         kfree(l_mg->vsc_list);
 942 fail:
 943         return -ENOMEM;
 944 }
 945
 946 static int pblk_line_meta_init(struct pblk *pblk)
 947 {
 948         struct nvm_tgt_dev *dev = pblk->dev;
 949         struct nvm_geo *geo = &dev->geo;
 950         struct pblk_line_meta *lm = &pblk->lm;
 951         unsigned int smeta_len, emeta_len;
 952         int i;
 953
 954         lm->sec_per_line = geo->clba * geo->all_luns;
 955         lm->blk_per_line = geo->all_luns;
 956         lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
 957         lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
 958         lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
 959         lm->mid_thrs = lm->sec_per_line / 2;
 960         lm->high_thrs = lm->sec_per_line / 4;
 961         lm->meta_distance = (geo->all_luns / 2) * pblk->min_write_pgs;
 962
 963         /* Calculate necessary pages for smeta. See comment over struct
 964          * line_smeta definition
 965          */
 966         i = 1;
 967 add_smeta_page:
 968         lm->smeta_sec = i * geo->ws_opt;
 969         lm->smeta_len = lm->smeta_sec * geo->csecs;
 970
 971         smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
 972         if (smeta_len > lm->smeta_len) {
 973                 i++;
 974                 goto add_smeta_page;
 975         }
 976
 977         /* Calculate necessary pages for emeta. See comment over struct
 978          * line_emeta definition
 979          */
 980         i = 1;
 981 add_emeta_page:
 982         lm->emeta_sec[0] = i * geo->ws_opt;
 983         lm->emeta_len[0] = lm->emeta_sec[0] * geo->csecs;
 984
 985         emeta_len = calc_emeta_len(pblk);
 986         if (emeta_len > lm->emeta_len[0]) {
 987                 i++;
 988                 goto add_emeta_page;
 989         }
 990
 991         lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;
 992
 993         lm->min_blk_line = 1;
 994         if (geo->all_luns > 1)
 995                 lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
 996                                         lm->emeta_sec[0], geo->clba);
 997
 998         if (lm->min_blk_line > lm->blk_per_line) {
 999                 pr_err("pblk: config. not supported. Min. LUN in line:%d\n",
1000                                                         lm->blk_per_line);
1001                 return -EINVAL;
1002         }
1003
1004         return 0;
1005 }
1006
1007 static int pblk_lines_init(struct pblk *pblk)
1008 {
1009         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1010         struct pblk_line *line;
1011         void *chunk_meta;
1012         long nr_free_chks = 0;
1013         int i, ret;
1014
1015         ret = pblk_line_meta_init(pblk);
1016         if (ret)
1017                 return ret;
1018
1019         ret = pblk_line_mg_init(pblk);
1020         if (ret)
1021                 return ret;
1022
1023         ret = pblk_luns_init(pblk);
1024         if (ret)
1025                 goto fail_free_meta;
1026
1027         chunk_meta = pblk_chunk_get_meta(pblk);
1028         if (IS_ERR(chunk_meta)) {
1029                 ret = PTR_ERR(chunk_meta);
1030                 goto fail_free_luns;
1031         }
1032
1033         pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
1034                                                                 GFP_KERNEL);
1035         if (!pblk->lines) {
1036                 ret = -ENOMEM;
1037                 goto fail_free_chunk_meta;
1038         }
1039
1040         for (i = 0; i < l_mg->nr_lines; i++) {
1041                 line = &pblk->lines[i];
1042
1043                 ret = pblk_alloc_line_meta(pblk, line);
1044                 if (ret)
1045                         goto fail_free_lines;
1046
1047                 nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
1048         }
1049
1050         pblk_set_provision(pblk, nr_free_chks);
1051
1052         kfree(chunk_meta);
1053         return 0;
1054
1055 fail_free_lines:
1056         while (--i >= 0)
1057                 pblk_line_meta_free(&pblk->lines[i]);
1058         kfree(pblk->lines);
1059 fail_free_chunk_meta:
1060         kfree(chunk_meta);
1061 fail_free_luns:
1062         kfree(pblk->luns);
1063 fail_free_meta:
1064         pblk_line_mg_free(pblk);
1065
1066         return ret;
1067 }
1068
1069 static int pblk_writer_init(struct pblk *pblk)
1070 {
1071         pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
1072         if (IS_ERR(pblk->writer_ts)) {
1073                 int err = PTR_ERR(pblk->writer_ts);
1074
1075                 if (err != -EINTR)
1076                         pr_err("pblk: could not allocate writer kthread (%d)\n",
1077                                         err);
1078                 return err;
1079         }
1080
1081         timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
1082         mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
1083
1084         return 0;
1085 }
1086
1087 static void pblk_writer_stop(struct pblk *pblk)
1088 {
1089         /* The pipeline must be stopped and the write buffer emptied before the
1090          * write thread is stopped
1091          */
1092         WARN(pblk_rb_read_count(&pblk->rwb),
1093                         "Stopping not fully persisted write buffer\n");
1094
1095         WARN(pblk_rb_sync_count(&pblk->rwb),
1096                         "Stopping not fully synced write buffer\n");
1097
1098         del_timer_sync(&pblk->wtimer);
1099         if (pblk->writer_ts)
1100                 kthread_stop(pblk->writer_ts);
1101 }
1102
1103 static void pblk_free(struct pblk *pblk)
1104 {
1105         pblk_lines_free(pblk);
1106         pblk_l2p_free(pblk);
1107         pblk_rwb_free(pblk);
1108         pblk_core_free(pblk);
1109
1110         kfree(pblk);
1111 }
1112
1113 static void pblk_tear_down(struct pblk *pblk)
1114 {
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         pr_debug("pblk: consistent tear down\n");
1121 }
1122
1123 static void pblk_exit(void *private)
1124 {
1125         struct pblk *pblk = private;
1126
1127         down_write(&pblk_lock);
1128         pblk_gc_exit(pblk);
1129         pblk_tear_down(pblk);
1130
1131 #ifdef CONFIG_NVM_DEBUG
1132         pr_info("pblk exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
1133 #endif
1134
1135         pblk_free(pblk);
1136         up_write(&pblk_lock);
1137 }
1138
1139 static sector_t pblk_capacity(void *private)
1140 {
1141         struct pblk *pblk = private;
1142
1143         return pblk->capacity * NR_PHY_IN_LOG;
1144 }
1145
1146 static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
1147                        int flags)
1148 {
1149         struct nvm_geo *geo = &dev->geo;
1150         struct request_queue *bqueue = dev->q;
1151         struct request_queue *tqueue = tdisk->queue;
1152         struct pblk *pblk;
1153         int ret;
1154
1155         /* pblk supports 1.2 and 2.0 versions */
1156         if (!(geo->version == NVM_OCSSD_SPEC_12 ||
1157                                         geo->version == NVM_OCSSD_SPEC_20)) {
1158                 pr_err("pblk: OCSSD version not supported (%u)\n",
1159                                                         geo->version);
1160                 return ERR_PTR(-EINVAL);
1161         }
1162
1163         if (geo->version == NVM_OCSSD_SPEC_12 && geo->dom & NVM_RSP_L2P) {
1164                 pr_err("pblk: host-side L2P table not supported. (%x)\n",
1165                                                         geo->dom);
1166                 return ERR_PTR(-EINVAL);
1167         }
1168
1169         pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
1170         if (!pblk)
1171                 return ERR_PTR(-ENOMEM);
1172
1173         pblk->dev = dev;
1174         pblk->disk = tdisk;
1175         pblk->state = PBLK_STATE_RUNNING;
1176         pblk->gc.gc_enabled = 0;
1177
1178         spin_lock_init(&pblk->trans_lock);
1179         spin_lock_init(&pblk->lock);
1180
1181 #ifdef CONFIG_NVM_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                 pr_err("pblk: could not initialize core\n");
1207                 goto fail;
1208         }
1209
1210         ret = pblk_lines_init(pblk);
1211         if (ret) {
1212                 pr_err("pblk: could not initialize lines\n");
1213                 goto fail_free_core;
1214         }
1215
1216         ret = pblk_rwb_init(pblk);
1217         if (ret) {
1218                 pr_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                 pr_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                         pr_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                 pr_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         pr_info("pblk(%s): luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
1253                         tdisk->disk_name,
1254                         geo->all_luns, pblk->l_mg.nr_lines,
1255                         (unsigned long long)pblk->rl.nr_secs,
1256                         pblk->rwb.nr_entries);
1257
1258         wake_up_process(pblk->writer_ts);
1259
1260         /* Check if we need to start GC */
1261         pblk_gc_should_kick(pblk);
1262
1263         return pblk;
1264
1265 fail_stop_writer:
1266         pblk_writer_stop(pblk);
1267 fail_free_l2p:
1268         pblk_l2p_free(pblk);
1269 fail_free_rwb:
1270         pblk_rwb_free(pblk);
1271 fail_free_lines:
1272         pblk_lines_free(pblk);
1273 fail_free_core:
1274         pblk_core_free(pblk);
1275 fail:
1276         kfree(pblk);
1277         return ERR_PTR(ret);
1278 }
1279
1280 /* physical block device target */
1281 static struct nvm_tgt_type tt_pblk = {
1282         .name           = "pblk",
1283         .version        = {1, 0, 0},
1284
1285         .make_rq        = pblk_make_rq,
1286         .capacity       = pblk_capacity,
1287
1288         .init           = pblk_init,
1289         .exit           = pblk_exit,
1290
1291         .sysfs_init     = pblk_sysfs_init,
1292         .sysfs_exit     = pblk_sysfs_exit,
1293         .owner          = THIS_MODULE,
1294 };
1295
1296 static int __init pblk_module_init(void)
1297 {
1298         int ret;
1299
1300         ret = bioset_init(&pblk_bio_set, BIO_POOL_SIZE, 0, 0);
1301         if (ret)
1302                 return ret;
1303         ret = nvm_register_tgt_type(&tt_pblk);
1304         if (ret)
1305                 bioset_exit(&pblk_bio_set);
1306         return ret;
1307 }
1308
1309 static void pblk_module_exit(void)
1310 {
1311         bioset_exit(&pblk_bio_set);
1312         nvm_unregister_tgt_type(&tt_pblk);
1313 }
1314
1315 module_init(pblk_module_init);
1316 module_exit(pblk_module_exit);
1317 MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
1318 MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
1319 MODULE_LICENSE("GPL v2");
1320 MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");