diff options
Diffstat (limited to 'drivers/lightnvm/pblk-recovery.c')
| -rw-r--r-- | drivers/lightnvm/pblk-recovery.c | 1011 |
1 files changed, 1011 insertions, 0 deletions
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c new file mode 100644 index 000000000..df75d9cae --- /dev/null +++ b/drivers/lightnvm/pblk-recovery.c @@ -0,0 +1,1011 @@ +/* + * Copyright (C) 2016 CNEX Labs + * Initial: Javier Gonzalez <javier@cnexlabs.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * pblk-recovery.c - pblk's recovery path + */ + +#include "pblk.h" + +int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf) +{ + u32 crc; + + crc = pblk_calc_emeta_crc(pblk, emeta_buf); + if (le32_to_cpu(emeta_buf->crc) != crc) + return 1; + + if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) + return 1; + + return 0; +} + +static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_emeta *emeta = line->emeta; + struct line_emeta *emeta_buf = emeta->buf; + __le64 *lba_list; + u64 data_start, data_end; + u64 nr_valid_lbas, nr_lbas = 0; + u64 i; + + lba_list = emeta_to_lbas(pblk, emeta_buf); + if (!lba_list) + return 1; + + data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; + data_end = line->emeta_ssec; + nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas); + + for (i = data_start; i < data_end; i++) { + struct ppa_addr ppa; + int pos; + + ppa = addr_to_gen_ppa(pblk, i, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + /* Do not update bad blocks */ + if (test_bit(pos, line->blk_bitmap)) + continue; + + if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) { + spin_lock(&line->lock); + if (test_and_set_bit(i, line->invalid_bitmap)) + WARN_ONCE(1, "pblk: rec. double invalidate:\n"); + else + le32_add_cpu(line->vsc, -1); + spin_unlock(&line->lock); + + continue; + } + + pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa); + nr_lbas++; + } + + if (nr_valid_lbas != nr_lbas) + pblk_err(pblk, "line %d - inconsistent lba list(%llu/%llu)\n", + line->id, nr_valid_lbas, nr_lbas); + + line->left_msecs = 0; + + return 0; +} + +static int pblk_calc_sec_in_line(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_line_meta *lm = &pblk->lm; + int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line); + + return lm->sec_per_line - lm->smeta_sec - lm->emeta_sec[0] - + nr_bb * geo->clba; +} + +struct pblk_recov_alloc { + struct ppa_addr *ppa_list; + struct pblk_sec_meta *meta_list; + struct nvm_rq *rqd; + void *data; + dma_addr_t dma_ppa_list; + dma_addr_t dma_meta_list; +}; + +static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line, + struct pblk_recov_alloc p, u64 r_ptr) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct ppa_addr *ppa_list; + struct pblk_sec_meta *meta_list; + struct nvm_rq *rqd; + struct bio *bio; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + u64 r_ptr_int; + int left_ppas; + int rq_ppas, rq_len; + int i, j; + int ret = 0; + + ppa_list = p.ppa_list; + meta_list = p.meta_list; + rqd = p.rqd; + data = p.data; + dma_ppa_list = p.dma_ppa_list; + dma_meta_list = p.dma_meta_list; + + left_ppas = line->cur_sec - r_ptr; + if (!left_ppas) + return 0; + + r_ptr_int = r_ptr; + +next_read_rq: + memset(rqd, 0, pblk_g_rq_size); + + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0); + if (!rq_ppas) + rq_ppas = pblk->min_write_pgs; + rq_len = rq_ppas * geo->csecs; + + bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL); + if (IS_ERR(bio)) + return PTR_ERR(bio); + + bio->bi_iter.bi_sector = 0; /* internal bio */ + bio_set_op_attrs(bio, REQ_OP_READ, 0); + + rqd->bio = bio; + rqd->opcode = NVM_OP_PREAD; + rqd->meta_list = meta_list; + rqd->nr_ppas = rq_ppas; + rqd->ppa_list = ppa_list; + rqd->dma_ppa_list = dma_ppa_list; + rqd->dma_meta_list = dma_meta_list; + + if (pblk_io_aligned(pblk, rq_ppas)) + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); + else + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); + + for (i = 0; i < rqd->nr_ppas; ) { + struct ppa_addr ppa; + int pos; + + ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + while (test_bit(pos, line->blk_bitmap)) { + r_ptr_int += pblk->min_write_pgs; + ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + for (j = 0; j < pblk->min_write_pgs; j++, i++, r_ptr_int++) + rqd->ppa_list[i] = + addr_to_gen_ppa(pblk, r_ptr_int, line->id); + } + + /* If read fails, more padding is needed */ + ret = pblk_submit_io_sync(pblk, rqd); + if (ret) { + pblk_err(pblk, "I/O submission failed: %d\n", ret); + return ret; + } + + atomic_dec(&pblk->inflight_io); + + /* At this point, the read should not fail. If it does, it is a problem + * we cannot recover from here. Need FTL log. + */ + if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) { + pblk_err(pblk, "L2P recovery failed (%d)\n", rqd->error); + return -EINTR; + } + + for (i = 0; i < rqd->nr_ppas; i++) { + u64 lba = le64_to_cpu(meta_list[i].lba); + + if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs) + continue; + + pblk_update_map(pblk, lba, rqd->ppa_list[i]); + } + + left_ppas -= rq_ppas; + if (left_ppas > 0) + goto next_read_rq; + + return 0; +} + +static void pblk_recov_complete(struct kref *ref) +{ + struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref); + + complete(&pad_rq->wait); +} + +static void pblk_end_io_recov(struct nvm_rq *rqd) +{ + struct pblk_pad_rq *pad_rq = rqd->private; + struct pblk *pblk = pad_rq->pblk; + + pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas); + + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); + + atomic_dec(&pblk->inflight_io); + kref_put(&pad_rq->ref, pblk_recov_complete); +} + +static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line, + int left_ppas) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct ppa_addr *ppa_list; + struct pblk_sec_meta *meta_list; + struct pblk_pad_rq *pad_rq; + struct nvm_rq *rqd; + struct bio *bio; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf); + u64 w_ptr = line->cur_sec; + int left_line_ppas, rq_ppas, rq_len; + int i, j; + int ret = 0; + + spin_lock(&line->lock); + left_line_ppas = line->left_msecs; + spin_unlock(&line->lock); + + pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL); + if (!pad_rq) + return -ENOMEM; + + data = vzalloc(array_size(pblk->max_write_pgs, geo->csecs)); + if (!data) { + ret = -ENOMEM; + goto free_rq; + } + + pad_rq->pblk = pblk; + init_completion(&pad_rq->wait); + kref_init(&pad_rq->ref); + +next_pad_rq: + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0); + if (rq_ppas < pblk->min_write_pgs) { + pblk_err(pblk, "corrupted pad line %d\n", line->id); + goto fail_free_pad; + } + + rq_len = rq_ppas * geo->csecs; + + meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); + if (!meta_list) { + ret = -ENOMEM; + goto fail_free_pad; + } + + ppa_list = (void *)(meta_list) + pblk_dma_meta_size; + dma_ppa_list = dma_meta_list + pblk_dma_meta_size; + + bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len, + PBLK_VMALLOC_META, GFP_KERNEL); + if (IS_ERR(bio)) { + ret = PTR_ERR(bio); + goto fail_free_meta; + } + + bio->bi_iter.bi_sector = 0; /* internal bio */ + bio_set_op_attrs(bio, REQ_OP_WRITE, 0); + + rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); + + rqd->bio = bio; + rqd->opcode = NVM_OP_PWRITE; + rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE); + rqd->meta_list = meta_list; + rqd->nr_ppas = rq_ppas; + rqd->ppa_list = ppa_list; + rqd->dma_ppa_list = dma_ppa_list; + rqd->dma_meta_list = dma_meta_list; + rqd->end_io = pblk_end_io_recov; + rqd->private = pad_rq; + + for (i = 0; i < rqd->nr_ppas; ) { + struct ppa_addr ppa; + int pos; + + w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs); + ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + while (test_bit(pos, line->blk_bitmap)) { + w_ptr += pblk->min_write_pgs; + ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) { + struct ppa_addr dev_ppa; + __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); + + dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + + pblk_map_invalidate(pblk, dev_ppa); + lba_list[w_ptr] = meta_list[i].lba = addr_empty; + rqd->ppa_list[i] = dev_ppa; + } + } + + kref_get(&pad_rq->ref); + pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas); + + ret = pblk_submit_io(pblk, rqd); + if (ret) { + pblk_err(pblk, "I/O submission failed: %d\n", ret); + pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas); + goto fail_free_bio; + } + + left_line_ppas -= rq_ppas; + left_ppas -= rq_ppas; + if (left_ppas && left_line_ppas) + goto next_pad_rq; + + kref_put(&pad_rq->ref, pblk_recov_complete); + + if (!wait_for_completion_io_timeout(&pad_rq->wait, + msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { + pblk_err(pblk, "pad write timed out\n"); + ret = -ETIME; + } + + if (!pblk_line_is_full(line)) + pblk_err(pblk, "corrupted padded line: %d\n", line->id); + + vfree(data); +free_rq: + kfree(pad_rq); + return ret; + +fail_free_bio: + bio_put(bio); +fail_free_meta: + nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); +fail_free_pad: + kfree(pad_rq); + vfree(data); + return ret; +} + +/* When this function is called, it means that not all upper pages have been + * written in a page that contains valid data. In order to recover this data, we + * first find the write pointer on the device, then we pad all necessary + * sectors, and finally attempt to read the valid data + */ +static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line, + struct pblk_recov_alloc p) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct ppa_addr *ppa_list; + struct pblk_sec_meta *meta_list; + struct nvm_rq *rqd; + struct bio *bio; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + u64 w_ptr = 0, r_ptr; + int rq_ppas, rq_len; + int i, j; + int ret = 0; + int rec_round; + int left_ppas = pblk_calc_sec_in_line(pblk, line) - line->cur_sec; + + ppa_list = p.ppa_list; + meta_list = p.meta_list; + rqd = p.rqd; + data = p.data; + dma_ppa_list = p.dma_ppa_list; + dma_meta_list = p.dma_meta_list; + + /* we could recover up until the line write pointer */ + r_ptr = line->cur_sec; + rec_round = 0; + +next_rq: + memset(rqd, 0, pblk_g_rq_size); + + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0); + if (!rq_ppas) + rq_ppas = pblk->min_write_pgs; + rq_len = rq_ppas * geo->csecs; + + bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL); + if (IS_ERR(bio)) + return PTR_ERR(bio); + + bio->bi_iter.bi_sector = 0; /* internal bio */ + bio_set_op_attrs(bio, REQ_OP_READ, 0); + + rqd->bio = bio; + rqd->opcode = NVM_OP_PREAD; + rqd->meta_list = meta_list; + rqd->nr_ppas = rq_ppas; + rqd->ppa_list = ppa_list; + rqd->dma_ppa_list = dma_ppa_list; + rqd->dma_meta_list = dma_meta_list; + + if (pblk_io_aligned(pblk, rq_ppas)) + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); + else + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); + + for (i = 0; i < rqd->nr_ppas; ) { + struct ppa_addr ppa; + int pos; + + w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs); + ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + while (test_bit(pos, line->blk_bitmap)) { + w_ptr += pblk->min_write_pgs; + ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) + rqd->ppa_list[i] = + addr_to_gen_ppa(pblk, w_ptr, line->id); + } + + ret = pblk_submit_io_sync(pblk, rqd); + if (ret) { + pblk_err(pblk, "I/O submission failed: %d\n", ret); + return ret; + } + + atomic_dec(&pblk->inflight_io); + + /* This should not happen since the read failed during normal recovery, + * but the media works funny sometimes... + */ + if (!rec_round++ && !rqd->error) { + rec_round = 0; + for (i = 0; i < rqd->nr_ppas; i++, r_ptr++) { + u64 lba = le64_to_cpu(meta_list[i].lba); + + if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs) + continue; + + pblk_update_map(pblk, lba, rqd->ppa_list[i]); + } + } + + /* Reached the end of the written line */ + if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) { + int pad_secs, nr_error_bits, bit; + int ret; + + bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas); + nr_error_bits = rqd->nr_ppas - bit; + + /* Roll back failed sectors */ + line->cur_sec -= nr_error_bits; + line->left_msecs += nr_error_bits; + bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits); + + pad_secs = pblk_pad_distance(pblk); + if (pad_secs > line->left_msecs) + pad_secs = line->left_msecs; + + ret = pblk_recov_pad_oob(pblk, line, pad_secs); + if (ret) + pblk_err(pblk, "OOB padding failed (err:%d)\n", ret); + + ret = pblk_recov_read_oob(pblk, line, p, r_ptr); + if (ret) + pblk_err(pblk, "OOB read failed (err:%d)\n", ret); + + left_ppas = 0; + } + + left_ppas -= rq_ppas; + if (left_ppas > 0) + goto next_rq; + + return ret; +} + +static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line, + struct pblk_recov_alloc p, int *done) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct ppa_addr *ppa_list; + struct pblk_sec_meta *meta_list; + struct nvm_rq *rqd; + struct bio *bio; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + u64 paddr; + int rq_ppas, rq_len; + int i, j; + int ret = 0; + int left_ppas = pblk_calc_sec_in_line(pblk, line); + + ppa_list = p.ppa_list; + meta_list = p.meta_list; + rqd = p.rqd; + data = p.data; + dma_ppa_list = p.dma_ppa_list; + dma_meta_list = p.dma_meta_list; + + *done = 1; + +next_rq: + memset(rqd, 0, pblk_g_rq_size); + + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0); + if (!rq_ppas) + rq_ppas = pblk->min_write_pgs; + rq_len = rq_ppas * geo->csecs; + + bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL); + if (IS_ERR(bio)) + return PTR_ERR(bio); + + bio->bi_iter.bi_sector = 0; /* internal bio */ + bio_set_op_attrs(bio, REQ_OP_READ, 0); + + rqd->bio = bio; + rqd->opcode = NVM_OP_PREAD; + rqd->meta_list = meta_list; + rqd->nr_ppas = rq_ppas; + rqd->ppa_list = ppa_list; + rqd->dma_ppa_list = dma_ppa_list; + rqd->dma_meta_list = dma_meta_list; + + if (pblk_io_aligned(pblk, rq_ppas)) + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); + else + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); + + for (i = 0; i < rqd->nr_ppas; ) { + struct ppa_addr ppa; + int pos; + + paddr = pblk_alloc_page(pblk, line, pblk->min_write_pgs); + ppa = addr_to_gen_ppa(pblk, paddr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + while (test_bit(pos, line->blk_bitmap)) { + paddr += pblk->min_write_pgs; + ppa = addr_to_gen_ppa(pblk, paddr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + for (j = 0; j < pblk->min_write_pgs; j++, i++, paddr++) + rqd->ppa_list[i] = + addr_to_gen_ppa(pblk, paddr, line->id); + } + + ret = pblk_submit_io_sync(pblk, rqd); + if (ret) { + pblk_err(pblk, "I/O submission failed: %d\n", ret); + bio_put(bio); + return ret; + } + + atomic_dec(&pblk->inflight_io); + + /* Reached the end of the written line */ + if (rqd->error) { + int nr_error_bits, bit; + + bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas); + nr_error_bits = rqd->nr_ppas - bit; + + /* Roll back failed sectors */ + line->cur_sec -= nr_error_bits; + line->left_msecs += nr_error_bits; + bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits); + + left_ppas = 0; + rqd->nr_ppas = bit; + + if (rqd->error != NVM_RSP_ERR_EMPTYPAGE) + *done = 0; + } + + for (i = 0; i < rqd->nr_ppas; i++) { + u64 lba = le64_to_cpu(meta_list[i].lba); + + if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs) + continue; + + pblk_update_map(pblk, lba, rqd->ppa_list[i]); + } + + left_ppas -= rq_ppas; + if (left_ppas > 0) + goto next_rq; + + return ret; +} + +/* Scan line for lbas on out of bound area */ +static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct nvm_rq *rqd; + struct ppa_addr *ppa_list; + struct pblk_sec_meta *meta_list; + struct pblk_recov_alloc p; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + int done, ret = 0; + + meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); + if (!meta_list) + return -ENOMEM; + + ppa_list = (void *)(meta_list) + pblk_dma_meta_size; + dma_ppa_list = dma_meta_list + pblk_dma_meta_size; + + data = kcalloc(pblk->max_write_pgs, geo->csecs, GFP_KERNEL); + if (!data) { + ret = -ENOMEM; + goto free_meta_list; + } + + rqd = pblk_alloc_rqd(pblk, PBLK_READ); + + p.ppa_list = ppa_list; + p.meta_list = meta_list; + p.rqd = rqd; + p.data = data; + p.dma_ppa_list = dma_ppa_list; + p.dma_meta_list = dma_meta_list; + + ret = pblk_recov_scan_oob(pblk, line, p, &done); + if (ret) { + pblk_err(pblk, "could not recover L2P from OOB\n"); + goto out; + } + + if (!done) { + ret = pblk_recov_scan_all_oob(pblk, line, p); + if (ret) { + pblk_err(pblk, "could not recover L2P from OOB\n"); + goto out; + } + } + + if (pblk_line_is_full(line)) + pblk_line_recov_close(pblk, line); + +out: + kfree(data); +free_meta_list: + nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); + + return ret; +} + +/* Insert lines ordered by sequence number (seq_num) on list */ +static void pblk_recov_line_add_ordered(struct list_head *head, + struct pblk_line *line) +{ + struct pblk_line *t = NULL; + + list_for_each_entry(t, head, list) + if (t->seq_nr > line->seq_nr) + break; + + __list_add(&line->list, t->list.prev, &t->list); +} + +static u64 pblk_line_emeta_start(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_line_meta *lm = &pblk->lm; + unsigned int emeta_secs; + u64 emeta_start; + struct ppa_addr ppa; + int pos; + + emeta_secs = lm->emeta_sec[0]; + emeta_start = lm->sec_per_line; + + while (emeta_secs) { + emeta_start--; + ppa = addr_to_gen_ppa(pblk, emeta_start, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + if (!test_bit(pos, line->blk_bitmap)) + emeta_secs--; + } + + return emeta_start; +} + +static int pblk_recov_check_line_version(struct pblk *pblk, + struct line_emeta *emeta) +{ + struct line_header *header = &emeta->header; + + if (header->version_major != EMETA_VERSION_MAJOR) { + pblk_err(pblk, "line major version mismatch: %d, expected: %d\n", + header->version_major, EMETA_VERSION_MAJOR); + return 1; + } + +#ifdef CONFIG_NVM_PBLK_DEBUG + if (header->version_minor > EMETA_VERSION_MINOR) + pblk_info(pblk, "newer line minor version found: %d\n", + header->version_minor); +#endif + + return 0; +} + +static void pblk_recov_wa_counters(struct pblk *pblk, + struct line_emeta *emeta) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct line_header *header = &emeta->header; + struct wa_counters *wa = emeta_to_wa(lm, emeta); + + /* WA counters were introduced in emeta version 0.2 */ + if (header->version_major > 0 || header->version_minor >= 2) { + u64 user = le64_to_cpu(wa->user); + u64 pad = le64_to_cpu(wa->pad); + u64 gc = le64_to_cpu(wa->gc); + + atomic64_set(&pblk->user_wa, user); + atomic64_set(&pblk->pad_wa, pad); + atomic64_set(&pblk->gc_wa, gc); + + pblk->user_rst_wa = user; + pblk->pad_rst_wa = pad; + pblk->gc_rst_wa = gc; + } +} + +static int pblk_line_was_written(struct pblk_line *line, + struct pblk *pblk) +{ + + struct pblk_line_meta *lm = &pblk->lm; + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct nvm_chk_meta *chunk; + struct ppa_addr bppa; + int smeta_blk; + + if (line->state == PBLK_LINESTATE_BAD) + return 0; + + smeta_blk = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line); + if (smeta_blk >= lm->blk_per_line) + return 0; + + bppa = pblk->luns[smeta_blk].bppa; + chunk = &line->chks[pblk_ppa_to_pos(geo, bppa)]; + + if (chunk->state & NVM_CHK_ST_FREE) + return 0; + + return 1; +} + +struct pblk_line *pblk_recov_l2p(struct pblk *pblk) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line *line, *tline, *data_line = NULL; + struct pblk_smeta *smeta; + struct pblk_emeta *emeta; + struct line_smeta *smeta_buf; + int found_lines = 0, recovered_lines = 0, open_lines = 0; + int is_next = 0; + int meta_line; + int i, valid_uuid = 0; + LIST_HEAD(recov_list); + + /* TODO: Implement FTL snapshot */ + + /* Scan recovery - takes place when FTL snapshot fails */ + spin_lock(&l_mg->free_lock); + meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES); + set_bit(meta_line, &l_mg->meta_bitmap); + smeta = l_mg->sline_meta[meta_line]; + emeta = l_mg->eline_meta[meta_line]; + smeta_buf = (struct line_smeta *)smeta; + spin_unlock(&l_mg->free_lock); + + /* Order data lines using their sequence number */ + for (i = 0; i < l_mg->nr_lines; i++) { + u32 crc; + + line = &pblk->lines[i]; + + memset(smeta, 0, lm->smeta_len); + line->smeta = smeta; + line->lun_bitmap = ((void *)(smeta_buf)) + + sizeof(struct line_smeta); + + if (!pblk_line_was_written(line, pblk)) + continue; + + /* Lines that cannot be read are assumed as not written here */ + if (pblk_line_read_smeta(pblk, line)) + continue; + + crc = pblk_calc_smeta_crc(pblk, smeta_buf); + if (le32_to_cpu(smeta_buf->crc) != crc) + continue; + + if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC) + continue; + + if (smeta_buf->header.version_major != SMETA_VERSION_MAJOR) { + pblk_err(pblk, "found incompatible line version %u\n", + smeta_buf->header.version_major); + return ERR_PTR(-EINVAL); + } + + /* The first valid instance uuid is used for initialization */ + if (!valid_uuid) { + memcpy(pblk->instance_uuid, smeta_buf->header.uuid, 16); + valid_uuid = 1; + } + + if (memcmp(pblk->instance_uuid, smeta_buf->header.uuid, 16)) { + pblk_debug(pblk, "ignore line %u due to uuid mismatch\n", + i); + continue; + } + + /* Update line metadata */ + spin_lock(&line->lock); + line->id = le32_to_cpu(smeta_buf->header.id); + line->type = le16_to_cpu(smeta_buf->header.type); + line->seq_nr = le64_to_cpu(smeta_buf->seq_nr); + spin_unlock(&line->lock); + + /* Update general metadata */ + spin_lock(&l_mg->free_lock); + if (line->seq_nr >= l_mg->d_seq_nr) + l_mg->d_seq_nr = line->seq_nr + 1; + l_mg->nr_free_lines--; + spin_unlock(&l_mg->free_lock); + + if (pblk_line_recov_alloc(pblk, line)) + goto out; + + pblk_recov_line_add_ordered(&recov_list, line); + found_lines++; + pblk_debug(pblk, "recovering data line %d, seq:%llu\n", + line->id, smeta_buf->seq_nr); + } + + if (!found_lines) { + pblk_setup_uuid(pblk); + + spin_lock(&l_mg->free_lock); + WARN_ON_ONCE(!test_and_clear_bit(meta_line, + &l_mg->meta_bitmap)); + spin_unlock(&l_mg->free_lock); + + goto out; + } + + /* Verify closed blocks and recover this portion of L2P table*/ + list_for_each_entry_safe(line, tline, &recov_list, list) { + recovered_lines++; + + line->emeta_ssec = pblk_line_emeta_start(pblk, line); + line->emeta = emeta; + memset(line->emeta->buf, 0, lm->emeta_len[0]); + + if (pblk_line_read_emeta(pblk, line, line->emeta->buf)) { + pblk_recov_l2p_from_oob(pblk, line); + goto next; + } + + if (pblk_recov_check_emeta(pblk, line->emeta->buf)) { + pblk_recov_l2p_from_oob(pblk, line); + goto next; + } + + if (pblk_recov_check_line_version(pblk, line->emeta->buf)) + return ERR_PTR(-EINVAL); + + pblk_recov_wa_counters(pblk, line->emeta->buf); + + if (pblk_recov_l2p_from_emeta(pblk, line)) + pblk_recov_l2p_from_oob(pblk, line); + +next: + if (pblk_line_is_full(line)) { + struct list_head *move_list; + + spin_lock(&line->lock); + line->state = PBLK_LINESTATE_CLOSED; + move_list = pblk_line_gc_list(pblk, line); + spin_unlock(&line->lock); + + spin_lock(&l_mg->gc_lock); + list_move_tail(&line->list, move_list); + spin_unlock(&l_mg->gc_lock); + + kfree(line->map_bitmap); + line->map_bitmap = NULL; + line->smeta = NULL; + line->emeta = NULL; + } else { + if (open_lines > 1) + pblk_err(pblk, "failed to recover L2P\n"); + + open_lines++; + line->meta_line = meta_line; + data_line = line; + } + } + + if (!open_lines) { + spin_lock(&l_mg->free_lock); + WARN_ON_ONCE(!test_and_clear_bit(meta_line, + &l_mg->meta_bitmap)); + spin_unlock(&l_mg->free_lock); + pblk_line_replace_data(pblk); + } else { + spin_lock(&l_mg->free_lock); + /* Allocate next line for preparation */ + l_mg->data_next = pblk_line_get(pblk); + if (l_mg->data_next) { + l_mg->data_next->seq_nr = l_mg->d_seq_nr++; + l_mg->data_next->type = PBLK_LINETYPE_DATA; + is_next = 1; + } + spin_unlock(&l_mg->free_lock); + } + + if (is_next) + pblk_line_erase(pblk, l_mg->data_next); + +out: + if (found_lines != recovered_lines) + pblk_err(pblk, "failed to recover all found lines %d/%d\n", + found_lines, recovered_lines); + + return data_line; +} + +/* + * Pad current line + */ +int pblk_recov_pad(struct pblk *pblk) +{ + struct pblk_line *line; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + int left_msecs; + int ret = 0; + + spin_lock(&l_mg->free_lock); + line = l_mg->data_line; + left_msecs = line->left_msecs; + spin_unlock(&l_mg->free_lock); + + ret = pblk_recov_pad_oob(pblk, line, left_msecs); + if (ret) { + pblk_err(pblk, "tear down padding failed (%d)\n", ret); + return ret; + } + + pblk_line_close_meta(pblk, line); + return ret; +} |