2 * Copyright (C) 2016 CNEX Labs
3 * Initial: Javier Gonzalez <javier@cnexlabs.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version
7 * 2 as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * pblk-recovery.c - pblk's recovery path
19 void pblk_submit_rec(struct work_struct *work)
21 struct pblk_rec_ctx *recovery =
22 container_of(work, struct pblk_rec_ctx, ws_rec);
23 struct pblk *pblk = recovery->pblk;
24 struct nvm_tgt_dev *dev = pblk->dev;
25 struct nvm_rq *rqd = recovery->rqd;
26 struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
27 int max_secs = nvm_max_phys_sects(dev);
29 unsigned int nr_rec_secs;
30 unsigned int pgs_read;
33 nr_rec_secs = bitmap_weight((unsigned long int *)&rqd->ppa_status,
36 bio = bio_alloc(GFP_KERNEL, nr_rec_secs);
38 bio->bi_iter.bi_sector = 0;
39 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
41 rqd->nr_ppas = nr_rec_secs;
43 pgs_read = pblk_rb_read_to_bio_list(&pblk->rwb, bio, &recovery->failed,
45 if (pgs_read != nr_rec_secs) {
46 pr_err("pblk: could not read recovery entries\n");
50 if (pblk_setup_w_rec_rq(pblk, rqd, c_ctx)) {
51 pr_err("pblk: could not setup recovery request\n");
55 #ifdef CONFIG_NVM_DEBUG
56 atomic_long_add(nr_rec_secs, &pblk->recov_writes);
59 ret = pblk_submit_io(pblk, rqd);
61 pr_err("pblk: I/O submission failed: %d\n", ret);
65 mempool_free(recovery, pblk->rec_pool);
70 pblk_free_rqd(pblk, rqd, PBLK_WRITE);
73 int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx,
74 struct pblk_rec_ctx *recovery, u64 *comp_bits,
77 struct nvm_tgt_dev *dev = pblk->dev;
78 int max_secs = nvm_max_phys_sects(dev);
79 struct nvm_rq *rec_rqd;
80 struct pblk_c_ctx *rec_ctx;
81 int nr_entries = c_ctx->nr_valid + c_ctx->nr_padded;
83 rec_rqd = pblk_alloc_rqd(pblk, PBLK_WRITE);
84 rec_ctx = nvm_rq_to_pdu(rec_rqd);
86 /* Copy completion bitmap, but exclude the first X completed entries */
87 bitmap_shift_right((unsigned long int *)&rec_rqd->ppa_status,
88 (unsigned long int *)comp_bits,
91 /* Save the context for the entries that need to be re-written and
92 * update current context with the completed entries.
94 rec_ctx->sentry = pblk_rb_wrap_pos(&pblk->rwb, c_ctx->sentry + comp);
95 if (comp >= c_ctx->nr_valid) {
96 rec_ctx->nr_valid = 0;
97 rec_ctx->nr_padded = nr_entries - comp;
99 c_ctx->nr_padded = comp - c_ctx->nr_valid;
101 rec_ctx->nr_valid = c_ctx->nr_valid - comp;
102 rec_ctx->nr_padded = c_ctx->nr_padded;
104 c_ctx->nr_valid = comp;
105 c_ctx->nr_padded = 0;
108 recovery->rqd = rec_rqd;
109 recovery->pblk = pblk;
114 int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf)
118 crc = pblk_calc_emeta_crc(pblk, emeta_buf);
119 if (le32_to_cpu(emeta_buf->crc) != crc)
122 if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC)
128 static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line)
130 struct nvm_tgt_dev *dev = pblk->dev;
131 struct nvm_geo *geo = &dev->geo;
132 struct pblk_line_meta *lm = &pblk->lm;
133 struct pblk_emeta *emeta = line->emeta;
134 struct line_emeta *emeta_buf = emeta->buf;
136 u64 data_start, data_end;
137 u64 nr_valid_lbas, nr_lbas = 0;
140 lba_list = emeta_to_lbas(pblk, emeta_buf);
144 data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec;
145 data_end = line->emeta_ssec;
146 nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas);
148 for (i = data_start; i < data_end; i++) {
152 ppa = addr_to_gen_ppa(pblk, i, line->id);
153 pos = pblk_ppa_to_pos(geo, ppa);
155 /* Do not update bad blocks */
156 if (test_bit(pos, line->blk_bitmap))
159 if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) {
160 spin_lock(&line->lock);
161 if (test_and_set_bit(i, line->invalid_bitmap))
162 WARN_ONCE(1, "pblk: rec. double invalidate:\n");
164 le32_add_cpu(line->vsc, -1);
165 spin_unlock(&line->lock);
170 pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa);
174 if (nr_valid_lbas != nr_lbas)
175 pr_err("pblk: line %d - inconsistent lba list(%llu/%llu)\n",
176 line->id, nr_valid_lbas, nr_lbas);
178 line->left_msecs = 0;
183 static int pblk_calc_sec_in_line(struct pblk *pblk, struct pblk_line *line)
185 struct nvm_tgt_dev *dev = pblk->dev;
186 struct nvm_geo *geo = &dev->geo;
187 struct pblk_line_meta *lm = &pblk->lm;
188 int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line);
190 return lm->sec_per_line - lm->smeta_sec - lm->emeta_sec[0] -
191 nr_bb * geo->sec_per_chk;
194 struct pblk_recov_alloc {
195 struct ppa_addr *ppa_list;
196 struct pblk_sec_meta *meta_list;
199 dma_addr_t dma_ppa_list;
200 dma_addr_t dma_meta_list;
203 static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line,
204 struct pblk_recov_alloc p, u64 r_ptr)
206 struct nvm_tgt_dev *dev = pblk->dev;
207 struct nvm_geo *geo = &dev->geo;
208 struct ppa_addr *ppa_list;
209 struct pblk_sec_meta *meta_list;
213 dma_addr_t dma_ppa_list, dma_meta_list;
220 ppa_list = p.ppa_list;
221 meta_list = p.meta_list;
224 dma_ppa_list = p.dma_ppa_list;
225 dma_meta_list = p.dma_meta_list;
227 left_ppas = line->cur_sec - r_ptr;
234 memset(rqd, 0, pblk_g_rq_size);
236 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
238 rq_ppas = pblk->min_write_pgs;
239 rq_len = rq_ppas * geo->sec_size;
241 bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
245 bio->bi_iter.bi_sector = 0; /* internal bio */
246 bio_set_op_attrs(bio, REQ_OP_READ, 0);
249 rqd->opcode = NVM_OP_PREAD;
250 rqd->meta_list = meta_list;
251 rqd->nr_ppas = rq_ppas;
252 rqd->ppa_list = ppa_list;
253 rqd->dma_ppa_list = dma_ppa_list;
254 rqd->dma_meta_list = dma_meta_list;
256 if (pblk_io_aligned(pblk, rq_ppas))
257 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
259 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
261 for (i = 0; i < rqd->nr_ppas; ) {
265 ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
266 pos = pblk_ppa_to_pos(geo, ppa);
268 while (test_bit(pos, line->blk_bitmap)) {
269 r_ptr_int += pblk->min_write_pgs;
270 ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
271 pos = pblk_ppa_to_pos(geo, ppa);
274 for (j = 0; j < pblk->min_write_pgs; j++, i++, r_ptr_int++)
276 addr_to_gen_ppa(pblk, r_ptr_int, line->id);
279 /* If read fails, more padding is needed */
280 ret = pblk_submit_io_sync(pblk, rqd);
282 pr_err("pblk: I/O submission failed: %d\n", ret);
286 atomic_dec(&pblk->inflight_io);
288 /* At this point, the read should not fail. If it does, it is a problem
289 * we cannot recover from here. Need FTL log.
291 if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) {
292 pr_err("pblk: L2P recovery failed (%d)\n", rqd->error);
296 for (i = 0; i < rqd->nr_ppas; i++) {
297 u64 lba = le64_to_cpu(meta_list[i].lba);
299 if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
302 pblk_update_map(pblk, lba, rqd->ppa_list[i]);
305 left_ppas -= rq_ppas;
312 static void pblk_recov_complete(struct kref *ref)
314 struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref);
316 complete(&pad_rq->wait);
319 static void pblk_end_io_recov(struct nvm_rq *rqd)
321 struct pblk_pad_rq *pad_rq = rqd->private;
322 struct pblk *pblk = pad_rq->pblk;
324 pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
326 pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
328 atomic_dec(&pblk->inflight_io);
329 kref_put(&pad_rq->ref, pblk_recov_complete);
332 static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
335 struct nvm_tgt_dev *dev = pblk->dev;
336 struct nvm_geo *geo = &dev->geo;
337 struct ppa_addr *ppa_list;
338 struct pblk_sec_meta *meta_list;
339 struct pblk_pad_rq *pad_rq;
343 dma_addr_t dma_ppa_list, dma_meta_list;
344 __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
345 u64 w_ptr = line->cur_sec;
346 int left_line_ppas, rq_ppas, rq_len;
350 spin_lock(&line->lock);
351 left_line_ppas = line->left_msecs;
352 spin_unlock(&line->lock);
354 pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL);
358 data = vzalloc(pblk->max_write_pgs * geo->sec_size);
365 init_completion(&pad_rq->wait);
366 kref_init(&pad_rq->ref);
369 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
370 if (rq_ppas < pblk->min_write_pgs) {
371 pr_err("pblk: corrupted pad line %d\n", line->id);
375 rq_len = rq_ppas * geo->sec_size;
377 meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
383 ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
384 dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
386 bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
387 PBLK_VMALLOC_META, GFP_KERNEL);
393 bio->bi_iter.bi_sector = 0; /* internal bio */
394 bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
396 rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
399 rqd->opcode = NVM_OP_PWRITE;
400 rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
401 rqd->meta_list = meta_list;
402 rqd->nr_ppas = rq_ppas;
403 rqd->ppa_list = ppa_list;
404 rqd->dma_ppa_list = dma_ppa_list;
405 rqd->dma_meta_list = dma_meta_list;
406 rqd->end_io = pblk_end_io_recov;
407 rqd->private = pad_rq;
409 for (i = 0; i < rqd->nr_ppas; ) {
413 w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
414 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
415 pos = pblk_ppa_to_pos(geo, ppa);
417 while (test_bit(pos, line->blk_bitmap)) {
418 w_ptr += pblk->min_write_pgs;
419 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
420 pos = pblk_ppa_to_pos(geo, ppa);
423 for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) {
424 struct ppa_addr dev_ppa;
425 __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
427 dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
429 pblk_map_invalidate(pblk, dev_ppa);
430 lba_list[w_ptr] = meta_list[i].lba = addr_empty;
431 rqd->ppa_list[i] = dev_ppa;
435 kref_get(&pad_rq->ref);
436 pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas);
438 ret = pblk_submit_io(pblk, rqd);
440 pr_err("pblk: I/O submission failed: %d\n", ret);
441 pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
445 left_line_ppas -= rq_ppas;
446 left_ppas -= rq_ppas;
447 if (left_ppas && left_line_ppas)
450 kref_put(&pad_rq->ref, pblk_recov_complete);
452 if (!wait_for_completion_io_timeout(&pad_rq->wait,
453 msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
454 pr_err("pblk: pad write timed out\n");
458 if (!pblk_line_is_full(line))
459 pr_err("pblk: corrupted padded line: %d\n", line->id);
469 nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
476 /* When this function is called, it means that not all upper pages have been
477 * written in a page that contains valid data. In order to recover this data, we
478 * first find the write pointer on the device, then we pad all necessary
479 * sectors, and finally attempt to read the valid data
481 static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
482 struct pblk_recov_alloc p)
484 struct nvm_tgt_dev *dev = pblk->dev;
485 struct nvm_geo *geo = &dev->geo;
486 struct ppa_addr *ppa_list;
487 struct pblk_sec_meta *meta_list;
491 dma_addr_t dma_ppa_list, dma_meta_list;
492 u64 w_ptr = 0, r_ptr;
497 int left_ppas = pblk_calc_sec_in_line(pblk, line) - line->cur_sec;
499 ppa_list = p.ppa_list;
500 meta_list = p.meta_list;
503 dma_ppa_list = p.dma_ppa_list;
504 dma_meta_list = p.dma_meta_list;
506 /* we could recover up until the line write pointer */
507 r_ptr = line->cur_sec;
511 memset(rqd, 0, pblk_g_rq_size);
513 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
515 rq_ppas = pblk->min_write_pgs;
516 rq_len = rq_ppas * geo->sec_size;
518 bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
522 bio->bi_iter.bi_sector = 0; /* internal bio */
523 bio_set_op_attrs(bio, REQ_OP_READ, 0);
526 rqd->opcode = NVM_OP_PREAD;
527 rqd->meta_list = meta_list;
528 rqd->nr_ppas = rq_ppas;
529 rqd->ppa_list = ppa_list;
530 rqd->dma_ppa_list = dma_ppa_list;
531 rqd->dma_meta_list = dma_meta_list;
533 if (pblk_io_aligned(pblk, rq_ppas))
534 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
536 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
538 for (i = 0; i < rqd->nr_ppas; ) {
542 w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
543 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
544 pos = pblk_ppa_to_pos(geo, ppa);
546 while (test_bit(pos, line->blk_bitmap)) {
547 w_ptr += pblk->min_write_pgs;
548 ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
549 pos = pblk_ppa_to_pos(geo, ppa);
552 for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++)
554 addr_to_gen_ppa(pblk, w_ptr, line->id);
557 ret = pblk_submit_io_sync(pblk, rqd);
559 pr_err("pblk: I/O submission failed: %d\n", ret);
563 atomic_dec(&pblk->inflight_io);
565 /* This should not happen since the read failed during normal recovery,
566 * but the media works funny sometimes...
568 if (!rec_round++ && !rqd->error) {
570 for (i = 0; i < rqd->nr_ppas; i++, r_ptr++) {
571 u64 lba = le64_to_cpu(meta_list[i].lba);
573 if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
576 pblk_update_map(pblk, lba, rqd->ppa_list[i]);
580 /* Reached the end of the written line */
581 if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
582 int pad_secs, nr_error_bits, bit;
585 bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas);
586 nr_error_bits = rqd->nr_ppas - bit;
588 /* Roll back failed sectors */
589 line->cur_sec -= nr_error_bits;
590 line->left_msecs += nr_error_bits;
591 bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
593 pad_secs = pblk_pad_distance(pblk);
594 if (pad_secs > line->left_msecs)
595 pad_secs = line->left_msecs;
597 ret = pblk_recov_pad_oob(pblk, line, pad_secs);
599 pr_err("pblk: OOB padding failed (err:%d)\n", ret);
601 ret = pblk_recov_read_oob(pblk, line, p, r_ptr);
603 pr_err("pblk: OOB read failed (err:%d)\n", ret);
608 left_ppas -= rq_ppas;
615 static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
616 struct pblk_recov_alloc p, int *done)
618 struct nvm_tgt_dev *dev = pblk->dev;
619 struct nvm_geo *geo = &dev->geo;
620 struct ppa_addr *ppa_list;
621 struct pblk_sec_meta *meta_list;
625 dma_addr_t dma_ppa_list, dma_meta_list;
630 int left_ppas = pblk_calc_sec_in_line(pblk, line);
632 ppa_list = p.ppa_list;
633 meta_list = p.meta_list;
636 dma_ppa_list = p.dma_ppa_list;
637 dma_meta_list = p.dma_meta_list;
642 memset(rqd, 0, pblk_g_rq_size);
644 rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
646 rq_ppas = pblk->min_write_pgs;
647 rq_len = rq_ppas * geo->sec_size;
649 bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
653 bio->bi_iter.bi_sector = 0; /* internal bio */
654 bio_set_op_attrs(bio, REQ_OP_READ, 0);
657 rqd->opcode = NVM_OP_PREAD;
658 rqd->meta_list = meta_list;
659 rqd->nr_ppas = rq_ppas;
660 rqd->ppa_list = ppa_list;
661 rqd->dma_ppa_list = dma_ppa_list;
662 rqd->dma_meta_list = dma_meta_list;
664 if (pblk_io_aligned(pblk, rq_ppas))
665 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
667 rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
669 for (i = 0; i < rqd->nr_ppas; ) {
673 paddr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
674 ppa = addr_to_gen_ppa(pblk, paddr, line->id);
675 pos = pblk_ppa_to_pos(geo, ppa);
677 while (test_bit(pos, line->blk_bitmap)) {
678 paddr += pblk->min_write_pgs;
679 ppa = addr_to_gen_ppa(pblk, paddr, line->id);
680 pos = pblk_ppa_to_pos(geo, ppa);
683 for (j = 0; j < pblk->min_write_pgs; j++, i++, paddr++)
685 addr_to_gen_ppa(pblk, paddr, line->id);
688 ret = pblk_submit_io_sync(pblk, rqd);
690 pr_err("pblk: I/O submission failed: %d\n", ret);
695 atomic_dec(&pblk->inflight_io);
697 /* Reached the end of the written line */
699 int nr_error_bits, bit;
701 bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas);
702 nr_error_bits = rqd->nr_ppas - bit;
704 /* Roll back failed sectors */
705 line->cur_sec -= nr_error_bits;
706 line->left_msecs += nr_error_bits;
707 bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
712 if (rqd->error != NVM_RSP_ERR_EMPTYPAGE)
716 for (i = 0; i < rqd->nr_ppas; i++) {
717 u64 lba = le64_to_cpu(meta_list[i].lba);
719 if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
722 pblk_update_map(pblk, lba, rqd->ppa_list[i]);
725 left_ppas -= rq_ppas;
732 /* Scan line for lbas on out of bound area */
733 static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line)
735 struct nvm_tgt_dev *dev = pblk->dev;
736 struct nvm_geo *geo = &dev->geo;
738 struct ppa_addr *ppa_list;
739 struct pblk_sec_meta *meta_list;
740 struct pblk_recov_alloc p;
742 dma_addr_t dma_ppa_list, dma_meta_list;
745 meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
749 ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
750 dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
752 data = kcalloc(pblk->max_write_pgs, geo->sec_size, GFP_KERNEL);
758 rqd = pblk_alloc_rqd(pblk, PBLK_READ);
760 p.ppa_list = ppa_list;
761 p.meta_list = meta_list;
764 p.dma_ppa_list = dma_ppa_list;
765 p.dma_meta_list = dma_meta_list;
767 ret = pblk_recov_scan_oob(pblk, line, p, &done);
769 pr_err("pblk: could not recover L2P from OOB\n");
774 ret = pblk_recov_scan_all_oob(pblk, line, p);
776 pr_err("pblk: could not recover L2P from OOB\n");
781 if (pblk_line_is_full(line))
782 pblk_line_recov_close(pblk, line);
787 nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
792 /* Insert lines ordered by sequence number (seq_num) on list */
793 static void pblk_recov_line_add_ordered(struct list_head *head,
794 struct pblk_line *line)
796 struct pblk_line *t = NULL;
798 list_for_each_entry(t, head, list)
799 if (t->seq_nr > line->seq_nr)
802 __list_add(&line->list, t->list.prev, &t->list);
805 static u64 pblk_line_emeta_start(struct pblk *pblk, struct pblk_line *line)
807 struct nvm_tgt_dev *dev = pblk->dev;
808 struct nvm_geo *geo = &dev->geo;
809 struct pblk_line_meta *lm = &pblk->lm;
810 unsigned int emeta_secs;
815 emeta_secs = lm->emeta_sec[0];
816 emeta_start = lm->sec_per_line;
820 ppa = addr_to_gen_ppa(pblk, emeta_start, line->id);
821 pos = pblk_ppa_to_pos(geo, ppa);
822 if (!test_bit(pos, line->blk_bitmap))
829 struct pblk_line *pblk_recov_l2p(struct pblk *pblk)
831 struct pblk_line_meta *lm = &pblk->lm;
832 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
833 struct pblk_line *line, *tline, *data_line = NULL;
834 struct pblk_smeta *smeta;
835 struct pblk_emeta *emeta;
836 struct line_smeta *smeta_buf;
837 int found_lines = 0, recovered_lines = 0, open_lines = 0;
840 int i, valid_uuid = 0;
841 LIST_HEAD(recov_list);
843 /* TODO: Implement FTL snapshot */
845 /* Scan recovery - takes place when FTL snapshot fails */
846 spin_lock(&l_mg->free_lock);
847 meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
848 set_bit(meta_line, &l_mg->meta_bitmap);
849 smeta = l_mg->sline_meta[meta_line];
850 emeta = l_mg->eline_meta[meta_line];
851 smeta_buf = (struct line_smeta *)smeta;
852 spin_unlock(&l_mg->free_lock);
854 /* Order data lines using their sequence number */
855 for (i = 0; i < l_mg->nr_lines; i++) {
858 line = &pblk->lines[i];
860 memset(smeta, 0, lm->smeta_len);
862 line->lun_bitmap = ((void *)(smeta_buf)) +
863 sizeof(struct line_smeta);
865 /* Lines that cannot be read are assumed as not written here */
866 if (pblk_line_read_smeta(pblk, line))
869 crc = pblk_calc_smeta_crc(pblk, smeta_buf);
870 if (le32_to_cpu(smeta_buf->crc) != crc)
873 if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC)
876 if (smeta_buf->header.version != SMETA_VERSION) {
877 pr_err("pblk: found incompatible line version %u\n",
878 le16_to_cpu(smeta_buf->header.version));
879 return ERR_PTR(-EINVAL);
882 /* The first valid instance uuid is used for initialization */
884 memcpy(pblk->instance_uuid, smeta_buf->header.uuid, 16);
888 if (memcmp(pblk->instance_uuid, smeta_buf->header.uuid, 16)) {
889 pr_debug("pblk: ignore line %u due to uuid mismatch\n",
894 /* Update line metadata */
895 spin_lock(&line->lock);
896 line->id = le32_to_cpu(smeta_buf->header.id);
897 line->type = le16_to_cpu(smeta_buf->header.type);
898 line->seq_nr = le64_to_cpu(smeta_buf->seq_nr);
899 spin_unlock(&line->lock);
901 /* Update general metadata */
902 spin_lock(&l_mg->free_lock);
903 if (line->seq_nr >= l_mg->d_seq_nr)
904 l_mg->d_seq_nr = line->seq_nr + 1;
905 l_mg->nr_free_lines--;
906 spin_unlock(&l_mg->free_lock);
908 if (pblk_line_recov_alloc(pblk, line))
911 pblk_recov_line_add_ordered(&recov_list, line);
913 pr_debug("pblk: recovering data line %d, seq:%llu\n",
914 line->id, smeta_buf->seq_nr);
918 pblk_setup_uuid(pblk);
920 spin_lock(&l_mg->free_lock);
921 WARN_ON_ONCE(!test_and_clear_bit(meta_line,
922 &l_mg->meta_bitmap));
923 spin_unlock(&l_mg->free_lock);
928 /* Verify closed blocks and recover this portion of L2P table*/
929 list_for_each_entry_safe(line, tline, &recov_list, list) {
932 line->emeta_ssec = pblk_line_emeta_start(pblk, line);
934 memset(line->emeta->buf, 0, lm->emeta_len[0]);
936 if (pblk_line_read_emeta(pblk, line, line->emeta->buf)) {
937 pblk_recov_l2p_from_oob(pblk, line);
941 if (pblk_recov_check_emeta(pblk, line->emeta->buf)) {
942 pblk_recov_l2p_from_oob(pblk, line);
946 if (pblk_recov_l2p_from_emeta(pblk, line))
947 pblk_recov_l2p_from_oob(pblk, line);
950 if (pblk_line_is_full(line)) {
951 struct list_head *move_list;
953 spin_lock(&line->lock);
954 line->state = PBLK_LINESTATE_CLOSED;
955 move_list = pblk_line_gc_list(pblk, line);
956 spin_unlock(&line->lock);
958 spin_lock(&l_mg->gc_lock);
959 list_move_tail(&line->list, move_list);
960 spin_unlock(&l_mg->gc_lock);
962 kfree(line->map_bitmap);
963 line->map_bitmap = NULL;
968 pr_err("pblk: failed to recover L2P\n");
971 line->meta_line = meta_line;
976 spin_lock(&l_mg->free_lock);
978 WARN_ON_ONCE(!test_and_clear_bit(meta_line,
979 &l_mg->meta_bitmap));
980 pblk_line_replace_data(pblk);
982 /* Allocate next line for preparation */
983 l_mg->data_next = pblk_line_get(pblk);
984 if (l_mg->data_next) {
985 l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
986 l_mg->data_next->type = PBLK_LINETYPE_DATA;
990 spin_unlock(&l_mg->free_lock);
993 pblk_line_erase(pblk, l_mg->data_next);
996 if (found_lines != recovered_lines)
997 pr_err("pblk: failed to recover all found lines %d/%d\n",
998 found_lines, recovered_lines);
1006 int pblk_recov_pad(struct pblk *pblk)
1008 struct pblk_line *line;
1009 struct pblk_line_mgmt *l_mg = &pblk->l_mg;
1013 spin_lock(&l_mg->free_lock);
1014 line = l_mg->data_line;
1015 left_msecs = line->left_msecs;
1016 spin_unlock(&l_mg->free_lock);
1018 ret = pblk_recov_pad_oob(pblk, line, left_msecs);
1020 pr_err("pblk: Tear down padding failed (%d)\n", ret);
1024 pblk_line_close_meta(pblk, line);