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