1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) 2016 CNEX Labs 4 * Initial: Javier Gonzalez <javier@cnexlabs.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * pblk-recovery.c - pblk's recovery path 16 * 17 * The L2P recovery path is single threaded as the L2P table is updated in order 18 * following the line sequence ID. 19 */ 20 21#include "pblk.h" 22#include "pblk-trace.h" 23 24int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf) 25{ 26 u32 crc; 27 28 crc = pblk_calc_emeta_crc(pblk, emeta_buf); 29 if (le32_to_cpu(emeta_buf->crc) != crc) 30 return 1; 31 32 if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) 33 return 1; 34 35 return 0; 36} 37 38static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line) 39{ 40 struct nvm_tgt_dev *dev = pblk->dev; 41 struct nvm_geo *geo = &dev->geo; 42 struct pblk_line_meta *lm = &pblk->lm; 43 struct pblk_emeta *emeta = line->emeta; 44 struct line_emeta *emeta_buf = emeta->buf; 45 __le64 *lba_list; 46 u64 data_start, data_end; 47 u64 nr_valid_lbas, nr_lbas = 0; 48 u64 i; 49 50 lba_list = emeta_to_lbas(pblk, emeta_buf); 51 if (!lba_list) 52 return 1; 53 54 data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; 55 data_end = line->emeta_ssec; 56 nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas); 57 58 for (i = data_start; i < data_end; i++) { 59 struct ppa_addr ppa; 60 int pos; 61 62 ppa = addr_to_gen_ppa(pblk, i, line->id); 63 pos = pblk_ppa_to_pos(geo, ppa); 64 65 /* Do not update bad blocks */ 66 if (test_bit(pos, line->blk_bitmap)) 67 continue; 68 69 if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) { 70 spin_lock(&line->lock); 71 if (test_and_set_bit(i, line->invalid_bitmap)) 72 WARN_ONCE(1, "pblk: rec. double invalidate:\n"); 73 else 74 le32_add_cpu(line->vsc, -1); 75 spin_unlock(&line->lock); 76 77 continue; 78 } 79 80 pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa); 81 nr_lbas++; 82 } 83 84 if (nr_valid_lbas != nr_lbas) 85 pblk_err(pblk, "line %d - inconsistent lba list(%llu/%llu)\n", 86 line->id, nr_valid_lbas, nr_lbas); 87 88 line->left_msecs = 0; 89 90 return 0; 91} 92 93static void pblk_update_line_wp(struct pblk *pblk, struct pblk_line *line, 94 u64 written_secs) 95{ 96 struct pblk_line_mgmt *l_mg = &pblk->l_mg; 97 int i; 98 99 for (i = 0; i < written_secs; i += pblk->min_write_pgs) 100 __pblk_alloc_page(pblk, line, pblk->min_write_pgs); 101 102 spin_lock(&l_mg->free_lock); 103 if (written_secs > line->left_msecs) { 104 /* 105 * We have all data sectors written 106 * and some emeta sectors written too. 107 */ 108 line->left_msecs = 0; 109 } else { 110 /* We have only some data sectors written. */ 111 line->left_msecs -= written_secs; 112 } 113 spin_unlock(&l_mg->free_lock); 114} 115 116static u64 pblk_sec_in_open_line(struct pblk *pblk, struct pblk_line *line) 117{ 118 struct pblk_line_meta *lm = &pblk->lm; 119 int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line); 120 u64 written_secs = 0; 121 int valid_chunks = 0; 122 int i; 123 124 for (i = 0; i < lm->blk_per_line; i++) { 125 struct nvm_chk_meta *chunk = &line->chks[i]; 126 127 if (chunk->state & NVM_CHK_ST_OFFLINE) 128 continue; 129 130 written_secs += chunk->wp; 131 valid_chunks++; 132 } 133 134 if (lm->blk_per_line - nr_bb != valid_chunks) 135 pblk_err(pblk, "recovery line %d is bad\n", line->id); 136 137 pblk_update_line_wp(pblk, line, written_secs - lm->smeta_sec); 138 139 return written_secs; 140} 141 142struct pblk_recov_alloc { 143 struct ppa_addr *ppa_list; 144 void *meta_list; 145 struct nvm_rq *rqd; 146 void *data; 147 dma_addr_t dma_ppa_list; 148 dma_addr_t dma_meta_list; 149}; 150 151static void pblk_recov_complete(struct kref *ref) 152{ 153 struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref); 154 155 complete(&pad_rq->wait); 156} 157 158static void pblk_end_io_recov(struct nvm_rq *rqd) 159{ 160 struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); 161 struct pblk_pad_rq *pad_rq = rqd->private; 162 struct pblk *pblk = pad_rq->pblk; 163 164 pblk_up_chunk(pblk, ppa_list[0]); 165 166 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); 167 168 atomic_dec(&pblk->inflight_io); 169 kref_put(&pad_rq->ref, pblk_recov_complete); 170} 171 172/* pad line using line bitmap. */ 173static int pblk_recov_pad_line(struct pblk *pblk, struct pblk_line *line, 174 int left_ppas) 175{ 176 struct nvm_tgt_dev *dev = pblk->dev; 177 struct nvm_geo *geo = &dev->geo; 178 void *meta_list; 179 struct pblk_pad_rq *pad_rq; 180 struct nvm_rq *rqd; 181 struct ppa_addr *ppa_list; 182 void *data; 183 __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf); 184 u64 w_ptr = line->cur_sec; 185 int left_line_ppas, rq_ppas; 186 int i, j; 187 int ret = 0; 188 189 spin_lock(&line->lock); 190 left_line_ppas = line->left_msecs; 191 spin_unlock(&line->lock); 192 193 pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL); 194 if (!pad_rq) 195 return -ENOMEM; 196 197 data = vzalloc(array_size(pblk->max_write_pgs, geo->csecs)); 198 if (!data) { 199 ret = -ENOMEM; 200 goto free_rq; 201 } 202 203 pad_rq->pblk = pblk; 204 init_completion(&pad_rq->wait); 205 kref_init(&pad_rq->ref); 206 207next_pad_rq: 208 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false); 209 if (rq_ppas < pblk->min_write_pgs) { 210 pblk_err(pblk, "corrupted pad line %d\n", line->id); 211 goto fail_complete; 212 } 213 214 rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); 215 216 ret = pblk_alloc_rqd_meta(pblk, rqd); 217 if (ret) { 218 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); 219 goto fail_complete; 220 } 221 222 rqd->bio = NULL; 223 rqd->opcode = NVM_OP_PWRITE; 224 rqd->is_seq = 1; 225 rqd->nr_ppas = rq_ppas; 226 rqd->end_io = pblk_end_io_recov; 227 rqd->private = pad_rq; 228 229 ppa_list = nvm_rq_to_ppa_list(rqd); 230 meta_list = rqd->meta_list; 231 232 for (i = 0; i < rqd->nr_ppas; ) { 233 struct ppa_addr ppa; 234 int pos; 235 236 w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs); 237 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); 238 pos = pblk_ppa_to_pos(geo, ppa); 239 240 while (test_bit(pos, line->blk_bitmap)) { 241 w_ptr += pblk->min_write_pgs; 242 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); 243 pos = pblk_ppa_to_pos(geo, ppa); 244 } 245 246 for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) { 247 struct ppa_addr dev_ppa; 248 struct pblk_sec_meta *meta; 249 __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); 250 251 dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); 252 253 pblk_map_invalidate(pblk, dev_ppa); 254 lba_list[w_ptr] = addr_empty; 255 meta = pblk_get_meta(pblk, meta_list, i); 256 meta->lba = addr_empty; 257 ppa_list[i] = dev_ppa; 258 } 259 } 260 261 kref_get(&pad_rq->ref); 262 pblk_down_chunk(pblk, ppa_list[0]); 263 264 ret = pblk_submit_io(pblk, rqd, data); 265 if (ret) { 266 pblk_err(pblk, "I/O submission failed: %d\n", ret); 267 pblk_up_chunk(pblk, ppa_list[0]); 268 kref_put(&pad_rq->ref, pblk_recov_complete); 269 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); 270 goto fail_complete; 271 } 272 273 left_line_ppas -= rq_ppas; 274 left_ppas -= rq_ppas; 275 if (left_ppas && left_line_ppas) 276 goto next_pad_rq; 277 278fail_complete: 279 kref_put(&pad_rq->ref, pblk_recov_complete); 280 wait_for_completion(&pad_rq->wait); 281 282 if (!pblk_line_is_full(line)) 283 pblk_err(pblk, "corrupted padded line: %d\n", line->id); 284 285 vfree(data); 286free_rq: 287 kfree(pad_rq); 288 return ret; 289} 290 291static int pblk_pad_distance(struct pblk *pblk, struct pblk_line *line) 292{ 293 struct nvm_tgt_dev *dev = pblk->dev; 294 struct nvm_geo *geo = &dev->geo; 295 int distance = geo->mw_cunits * geo->all_luns * geo->ws_opt; 296 297 return (distance > line->left_msecs) ? line->left_msecs : distance; 298} 299 300/* Return a chunk belonging to a line by stripe(write order) index */ 301static struct nvm_chk_meta *pblk_get_stripe_chunk(struct pblk *pblk, 302 struct pblk_line *line, 303 int index) 304{ 305 struct nvm_tgt_dev *dev = pblk->dev; 306 struct nvm_geo *geo = &dev->geo; 307 struct pblk_lun *rlun; 308 struct ppa_addr ppa; 309 int pos; 310 311 rlun = &pblk->luns[index]; 312 ppa = rlun->bppa; 313 pos = pblk_ppa_to_pos(geo, ppa); 314 315 return &line->chks[pos]; 316} 317 318static int pblk_line_wps_are_unbalanced(struct pblk *pblk, 319 struct pblk_line *line) 320{ 321 struct pblk_line_meta *lm = &pblk->lm; 322 int blk_in_line = lm->blk_per_line; 323 struct nvm_chk_meta *chunk; 324 u64 max_wp, min_wp; 325 int i; 326 327 i = find_first_zero_bit(line->blk_bitmap, blk_in_line); 328 329 /* If there is one or zero good chunks in the line, 330 * the write pointers can't be unbalanced. 331 */ 332 if (i >= (blk_in_line - 1)) 333 return 0; 334 335 chunk = pblk_get_stripe_chunk(pblk, line, i); 336 max_wp = chunk->wp; 337 if (max_wp > pblk->max_write_pgs) 338 min_wp = max_wp - pblk->max_write_pgs; 339 else 340 min_wp = 0; 341 342 i = find_next_zero_bit(line->blk_bitmap, blk_in_line, i + 1); 343 while (i < blk_in_line) { 344 chunk = pblk_get_stripe_chunk(pblk, line, i); 345 if (chunk->wp > max_wp || chunk->wp < min_wp) 346 return 1; 347 348 i = find_next_zero_bit(line->blk_bitmap, blk_in_line, i + 1); 349 } 350 351 return 0; 352} 353 354static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line, 355 struct pblk_recov_alloc p) 356{ 357 struct nvm_tgt_dev *dev = pblk->dev; 358 struct pblk_line_meta *lm = &pblk->lm; 359 struct nvm_geo *geo = &dev->geo; 360 struct ppa_addr *ppa_list; 361 void *meta_list; 362 struct nvm_rq *rqd; 363 void *data; 364 dma_addr_t dma_ppa_list, dma_meta_list; 365 __le64 *lba_list; 366 u64 paddr = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; 367 bool padded = false; 368 int rq_ppas; 369 int i, j; 370 int ret; 371 u64 left_ppas = pblk_sec_in_open_line(pblk, line) - lm->smeta_sec; 372 373 if (pblk_line_wps_are_unbalanced(pblk, line)) 374 pblk_warn(pblk, "recovering unbalanced line (%d)\n", line->id); 375 376 ppa_list = p.ppa_list; 377 meta_list = p.meta_list; 378 rqd = p.rqd; 379 data = p.data; 380 dma_ppa_list = p.dma_ppa_list; 381 dma_meta_list = p.dma_meta_list; 382 383 lba_list = emeta_to_lbas(pblk, line->emeta->buf); 384 385next_rq: 386 memset(rqd, 0, pblk_g_rq_size); 387 388 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false); 389 if (!rq_ppas) 390 rq_ppas = pblk->min_write_pgs; 391 392retry_rq: 393 rqd->bio = NULL; 394 rqd->opcode = NVM_OP_PREAD; 395 rqd->meta_list = meta_list; 396 rqd->nr_ppas = rq_ppas; 397 rqd->ppa_list = ppa_list; 398 rqd->dma_ppa_list = dma_ppa_list; 399 rqd->dma_meta_list = dma_meta_list; 400 ppa_list = nvm_rq_to_ppa_list(rqd); 401 402 if (pblk_io_aligned(pblk, rq_ppas)) 403 rqd->is_seq = 1; 404 405 for (i = 0; i < rqd->nr_ppas; ) { 406 struct ppa_addr ppa; 407 int pos; 408 409 ppa = addr_to_gen_ppa(pblk, paddr, line->id); 410 pos = pblk_ppa_to_pos(geo, ppa); 411 412 while (test_bit(pos, line->blk_bitmap)) { 413 paddr += pblk->min_write_pgs; 414 ppa = addr_to_gen_ppa(pblk, paddr, line->id); 415 pos = pblk_ppa_to_pos(geo, ppa); 416 } 417 418 for (j = 0; j < pblk->min_write_pgs; j++, i++) 419 ppa_list[i] = 420 addr_to_gen_ppa(pblk, paddr + j, line->id); 421 } 422 423 ret = pblk_submit_io_sync(pblk, rqd, data); 424 if (ret) { 425 pblk_err(pblk, "I/O submission failed: %d\n", ret); 426 return ret; 427 } 428 429 atomic_dec(&pblk->inflight_io); 430 431 /* If a read fails, do a best effort by padding the line and retrying */ 432 if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) { 433 int pad_distance, ret; 434 435 if (padded) { 436 pblk_log_read_err(pblk, rqd); 437 return -EINTR; 438 } 439 440 pad_distance = pblk_pad_distance(pblk, line); 441 ret = pblk_recov_pad_line(pblk, line, pad_distance); 442 if (ret) { 443 return ret; 444 } 445 446 padded = true; 447 goto retry_rq; 448 } 449 450 pblk_get_packed_meta(pblk, rqd); 451 452 for (i = 0; i < rqd->nr_ppas; i++) { 453 struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); 454 u64 lba = le64_to_cpu(meta->lba); 455 456 lba_list[paddr++] = cpu_to_le64(lba); 457 458 if (lba == ADDR_EMPTY || lba >= pblk->capacity) 459 continue; 460 461 line->nr_valid_lbas++; 462 pblk_update_map(pblk, lba, ppa_list[i]); 463 } 464 465 left_ppas -= rq_ppas; 466 if (left_ppas > 0) 467 goto next_rq; 468 469#ifdef CONFIG_NVM_PBLK_DEBUG 470 WARN_ON(padded && !pblk_line_is_full(line)); 471#endif 472 473 return 0; 474} 475 476/* Scan line for lbas on out of bound area */ 477static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line) 478{ 479 struct nvm_tgt_dev *dev = pblk->dev; 480 struct nvm_geo *geo = &dev->geo; 481 struct nvm_rq *rqd; 482 struct ppa_addr *ppa_list; 483 void *meta_list; 484 struct pblk_recov_alloc p; 485 void *data; 486 dma_addr_t dma_ppa_list, dma_meta_list; 487 int ret = 0; 488 489 meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); 490 if (!meta_list) 491 return -ENOMEM; 492 493 ppa_list = (void *)(meta_list) + pblk_dma_meta_size(pblk); 494 dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk); 495 496 data = kcalloc(pblk->max_write_pgs, geo->csecs, GFP_KERNEL); 497 if (!data) { 498 ret = -ENOMEM; 499 goto free_meta_list; 500 } 501 502 rqd = mempool_alloc(&pblk->r_rq_pool, GFP_KERNEL); 503 memset(rqd, 0, pblk_g_rq_size); 504 505 p.ppa_list = ppa_list; 506 p.meta_list = meta_list; 507 p.rqd = rqd; 508 p.data = data; 509 p.dma_ppa_list = dma_ppa_list; 510 p.dma_meta_list = dma_meta_list; 511 512 ret = pblk_recov_scan_oob(pblk, line, p); 513 if (ret) { 514 pblk_err(pblk, "could not recover L2P form OOB\n"); 515 goto out; 516 } 517 518 if (pblk_line_is_full(line)) 519 pblk_line_recov_close(pblk, line); 520 521out: 522 mempool_free(rqd, &pblk->r_rq_pool); 523 kfree(data); 524free_meta_list: 525 nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); 526 527 return ret; 528} 529 530/* Insert lines ordered by sequence number (seq_num) on list */ 531static void pblk_recov_line_add_ordered(struct list_head *head, 532 struct pblk_line *line) 533{ 534 struct pblk_line *t = NULL; 535 536 list_for_each_entry(t, head, list) 537 if (t->seq_nr > line->seq_nr) 538 break; 539 540 __list_add(&line->list, t->list.prev, &t->list); 541} 542 543static u64 pblk_line_emeta_start(struct pblk *pblk, struct pblk_line *line) 544{ 545 struct nvm_tgt_dev *dev = pblk->dev; 546 struct nvm_geo *geo = &dev->geo; 547 struct pblk_line_meta *lm = &pblk->lm; 548 unsigned int emeta_secs; 549 u64 emeta_start; 550 struct ppa_addr ppa; 551 int pos; 552 553 emeta_secs = lm->emeta_sec[0]; 554 emeta_start = lm->sec_per_line; 555 556 while (emeta_secs) { 557 emeta_start--; 558 ppa = addr_to_gen_ppa(pblk, emeta_start, line->id); 559 pos = pblk_ppa_to_pos(geo, ppa); 560 if (!test_bit(pos, line->blk_bitmap)) 561 emeta_secs--; 562 } 563 564 return emeta_start; 565} 566 567static int pblk_recov_check_line_version(struct pblk *pblk, 568 struct line_emeta *emeta) 569{ 570 struct line_header *header = &emeta->header; 571 572 if (header->version_major != EMETA_VERSION_MAJOR) { 573 pblk_err(pblk, "line major version mismatch: %d, expected: %d\n", 574 header->version_major, EMETA_VERSION_MAJOR); 575 return 1; 576 } 577 578#ifdef CONFIG_NVM_PBLK_DEBUG 579 if (header->version_minor > EMETA_VERSION_MINOR) 580 pblk_info(pblk, "newer line minor version found: %d\n", 581 header->version_minor); 582#endif 583 584 return 0; 585} 586 587static void pblk_recov_wa_counters(struct pblk *pblk, 588 struct line_emeta *emeta) 589{ 590 struct pblk_line_meta *lm = &pblk->lm; 591 struct line_header *header = &emeta->header; 592 struct wa_counters *wa = emeta_to_wa(lm, emeta); 593 594 /* WA counters were introduced in emeta version 0.2 */ 595 if (header->version_major > 0 || header->version_minor >= 2) { 596 u64 user = le64_to_cpu(wa->user); 597 u64 pad = le64_to_cpu(wa->pad); 598 u64 gc = le64_to_cpu(wa->gc); 599 600 atomic64_set(&pblk->user_wa, user); 601 atomic64_set(&pblk->pad_wa, pad); 602 atomic64_set(&pblk->gc_wa, gc); 603 604 pblk->user_rst_wa = user; 605 pblk->pad_rst_wa = pad; 606 pblk->gc_rst_wa = gc; 607 } 608} 609 610static int pblk_line_was_written(struct pblk_line *line, 611 struct pblk *pblk) 612{ 613 614 struct pblk_line_meta *lm = &pblk->lm; 615 struct nvm_tgt_dev *dev = pblk->dev; 616 struct nvm_geo *geo = &dev->geo; 617 struct nvm_chk_meta *chunk; 618 struct ppa_addr bppa; 619 int smeta_blk; 620 621 if (line->state == PBLK_LINESTATE_BAD) 622 return 0; 623 624 smeta_blk = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line); 625 if (smeta_blk >= lm->blk_per_line) 626 return 0; 627 628 bppa = pblk->luns[smeta_blk].bppa; 629 chunk = &line->chks[pblk_ppa_to_pos(geo, bppa)]; 630 631 if (chunk->state & NVM_CHK_ST_CLOSED || 632 (chunk->state & NVM_CHK_ST_OPEN 633 && chunk->wp >= lm->smeta_sec)) 634 return 1; 635 636 return 0; 637} 638 639static bool pblk_line_is_open(struct pblk *pblk, struct pblk_line *line) 640{ 641 struct pblk_line_meta *lm = &pblk->lm; 642 int i; 643 644 for (i = 0; i < lm->blk_per_line; i++) 645 if (line->chks[i].state & NVM_CHK_ST_OPEN) 646 return true; 647 648 return false; 649} 650 651struct pblk_line *pblk_recov_l2p(struct pblk *pblk) 652{ 653 struct pblk_line_meta *lm = &pblk->lm; 654 struct pblk_line_mgmt *l_mg = &pblk->l_mg; 655 struct pblk_line *line, *tline, *data_line = NULL; 656 struct pblk_smeta *smeta; 657 struct pblk_emeta *emeta; 658 struct line_smeta *smeta_buf; 659 int found_lines = 0, recovered_lines = 0, open_lines = 0; 660 int is_next = 0; 661 int meta_line; 662 int i, valid_uuid = 0; 663 LIST_HEAD(recov_list); 664 665 /* TODO: Implement FTL snapshot */ 666 667 /* Scan recovery - takes place when FTL snapshot fails */ 668 spin_lock(&l_mg->free_lock); 669 meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES); 670 set_bit(meta_line, &l_mg->meta_bitmap); 671 smeta = l_mg->sline_meta[meta_line]; 672 emeta = l_mg->eline_meta[meta_line]; 673 smeta_buf = (struct line_smeta *)smeta; 674 spin_unlock(&l_mg->free_lock); 675 676 /* Order data lines using their sequence number */ 677 for (i = 0; i < l_mg->nr_lines; i++) { 678 u32 crc; 679 680 line = &pblk->lines[i]; 681 682 memset(smeta, 0, lm->smeta_len); 683 line->smeta = smeta; 684 line->lun_bitmap = ((void *)(smeta_buf)) + 685 sizeof(struct line_smeta); 686 687 if (!pblk_line_was_written(line, pblk)) 688 continue; 689 690 /* Lines that cannot be read are assumed as not written here */ 691 if (pblk_line_smeta_read(pblk, line)) 692 continue; 693 694 crc = pblk_calc_smeta_crc(pblk, smeta_buf); 695 if (le32_to_cpu(smeta_buf->crc) != crc) 696 continue; 697 698 if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC) 699 continue; 700 701 if (smeta_buf->header.version_major != SMETA_VERSION_MAJOR) { 702 pblk_err(pblk, "found incompatible line version %u\n", 703 smeta_buf->header.version_major); 704 return ERR_PTR(-EINVAL); 705 } 706 707 /* The first valid instance uuid is used for initialization */ 708 if (!valid_uuid) { 709 guid_copy(&pblk->instance_uuid, 710 (guid_t *)&smeta_buf->header.uuid); 711 valid_uuid = 1; 712 } 713 714 if (!guid_equal(&pblk->instance_uuid, 715 (guid_t *)&smeta_buf->header.uuid)) { 716 pblk_debug(pblk, "ignore line %u due to uuid mismatch\n", 717 i); 718 continue; 719 } 720 721 /* Update line metadata */ 722 spin_lock(&line->lock); 723 line->id = le32_to_cpu(smeta_buf->header.id); 724 line->type = le16_to_cpu(smeta_buf->header.type); 725 line->seq_nr = le64_to_cpu(smeta_buf->seq_nr); 726 spin_unlock(&line->lock); 727 728 /* Update general metadata */ 729 spin_lock(&l_mg->free_lock); 730 if (line->seq_nr >= l_mg->d_seq_nr) 731 l_mg->d_seq_nr = line->seq_nr + 1; 732 l_mg->nr_free_lines--; 733 spin_unlock(&l_mg->free_lock); 734 735 if (pblk_line_recov_alloc(pblk, line)) 736 goto out; 737 738 pblk_recov_line_add_ordered(&recov_list, line); 739 found_lines++; 740 pblk_debug(pblk, "recovering data line %d, seq:%llu\n", 741 line->id, smeta_buf->seq_nr); 742 } 743 744 if (!found_lines) { 745 guid_gen(&pblk->instance_uuid); 746 747 spin_lock(&l_mg->free_lock); 748 WARN_ON_ONCE(!test_and_clear_bit(meta_line, 749 &l_mg->meta_bitmap)); 750 spin_unlock(&l_mg->free_lock); 751 752 goto out; 753 } 754 755 /* Verify closed blocks and recover this portion of L2P table*/ 756 list_for_each_entry_safe(line, tline, &recov_list, list) { 757 recovered_lines++; 758 759 line->emeta_ssec = pblk_line_emeta_start(pblk, line); 760 line->emeta = emeta; 761 memset(line->emeta->buf, 0, lm->emeta_len[0]); 762 763 if (pblk_line_is_open(pblk, line)) { 764 pblk_recov_l2p_from_oob(pblk, line); 765 goto next; 766 } 767 768 if (pblk_line_emeta_read(pblk, line, line->emeta->buf)) { 769 pblk_recov_l2p_from_oob(pblk, line); 770 goto next; 771 } 772 773 if (pblk_recov_check_emeta(pblk, line->emeta->buf)) { 774 pblk_recov_l2p_from_oob(pblk, line); 775 goto next; 776 } 777 778 if (pblk_recov_check_line_version(pblk, line->emeta->buf)) 779 return ERR_PTR(-EINVAL); 780 781 pblk_recov_wa_counters(pblk, line->emeta->buf); 782 783 if (pblk_recov_l2p_from_emeta(pblk, line)) 784 pblk_recov_l2p_from_oob(pblk, line); 785 786next: 787 if (pblk_line_is_full(line)) { 788 struct list_head *move_list; 789 790 spin_lock(&line->lock); 791 line->state = PBLK_LINESTATE_CLOSED; 792 trace_pblk_line_state(pblk_disk_name(pblk), line->id, 793 line->state); 794 move_list = pblk_line_gc_list(pblk, line); 795 spin_unlock(&line->lock); 796 797 spin_lock(&l_mg->gc_lock); 798 list_move_tail(&line->list, move_list); 799 spin_unlock(&l_mg->gc_lock); 800 801 mempool_free(line->map_bitmap, l_mg->bitmap_pool); 802 line->map_bitmap = NULL; 803 line->smeta = NULL; 804 line->emeta = NULL; 805 } else { 806 spin_lock(&line->lock); 807 line->state = PBLK_LINESTATE_OPEN; 808 spin_unlock(&line->lock); 809 810 line->emeta->mem = 0; 811 atomic_set(&line->emeta->sync, 0); 812 813 trace_pblk_line_state(pblk_disk_name(pblk), line->id, 814 line->state); 815 816 data_line = line; 817 line->meta_line = meta_line; 818 819 open_lines++; 820 } 821 } 822 823 if (!open_lines) { 824 spin_lock(&l_mg->free_lock); 825 WARN_ON_ONCE(!test_and_clear_bit(meta_line, 826 &l_mg->meta_bitmap)); 827 spin_unlock(&l_mg->free_lock); 828 } else { 829 spin_lock(&l_mg->free_lock); 830 l_mg->data_line = data_line; 831 /* Allocate next line for preparation */ 832 l_mg->data_next = pblk_line_get(pblk); 833 if (l_mg->data_next) { 834 l_mg->data_next->seq_nr = l_mg->d_seq_nr++; 835 l_mg->data_next->type = PBLK_LINETYPE_DATA; 836 is_next = 1; 837 } 838 spin_unlock(&l_mg->free_lock); 839 } 840 841 if (is_next) 842 pblk_line_erase(pblk, l_mg->data_next); 843 844out: 845 if (found_lines != recovered_lines) 846 pblk_err(pblk, "failed to recover all found lines %d/%d\n", 847 found_lines, recovered_lines); 848 849 return data_line; 850} 851 852/* 853 * Pad current line 854 */ 855int pblk_recov_pad(struct pblk *pblk) 856{ 857 struct pblk_line *line; 858 struct pblk_line_mgmt *l_mg = &pblk->l_mg; 859 int left_msecs; 860 int ret = 0; 861 862 spin_lock(&l_mg->free_lock); 863 line = l_mg->data_line; 864 left_msecs = line->left_msecs; 865 spin_unlock(&l_mg->free_lock); 866 867 ret = pblk_recov_pad_line(pblk, line, left_msecs); 868 if (ret) { 869 pblk_err(pblk, "tear down padding failed (%d)\n", ret); 870 return ret; 871 } 872 873 pblk_line_close_meta(pblk, line); 874 return ret; 875} 876