| /* |
| * 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" |
| |
| void pblk_submit_rec(struct work_struct *work) |
| { |
| struct pblk_rec_ctx *recovery = |
| container_of(work, struct pblk_rec_ctx, ws_rec); |
| struct pblk *pblk = recovery->pblk; |
| struct nvm_tgt_dev *dev = pblk->dev; |
| struct nvm_rq *rqd = recovery->rqd; |
| struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); |
| int max_secs = nvm_max_phys_sects(dev); |
| struct bio *bio; |
| unsigned int nr_rec_secs; |
| unsigned int pgs_read; |
| int ret; |
| |
| nr_rec_secs = bitmap_weight((unsigned long int *)&rqd->ppa_status, |
| max_secs); |
| |
| bio = bio_alloc(GFP_KERNEL, nr_rec_secs); |
| if (!bio) { |
| pr_err("pblk: not able to create recovery bio\n"); |
| return; |
| } |
| |
| bio->bi_iter.bi_sector = 0; |
| bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
| rqd->bio = bio; |
| rqd->nr_ppas = nr_rec_secs; |
| |
| pgs_read = pblk_rb_read_to_bio_list(&pblk->rwb, bio, &recovery->failed, |
| nr_rec_secs); |
| if (pgs_read != nr_rec_secs) { |
| pr_err("pblk: could not read recovery entries\n"); |
| goto err; |
| } |
| |
| if (pblk_setup_w_rec_rq(pblk, rqd, c_ctx)) { |
| pr_err("pblk: could not setup recovery request\n"); |
| goto err; |
| } |
| |
| #ifdef CONFIG_NVM_DEBUG |
| atomic_long_add(nr_rec_secs, &pblk->recov_writes); |
| #endif |
| |
| ret = pblk_submit_io(pblk, rqd); |
| if (ret) { |
| pr_err("pblk: I/O submission failed: %d\n", ret); |
| goto err; |
| } |
| |
| mempool_free(recovery, pblk->rec_pool); |
| return; |
| |
| err: |
| bio_put(bio); |
| pblk_free_rqd(pblk, rqd, WRITE); |
| } |
| |
| int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx, |
| struct pblk_rec_ctx *recovery, u64 *comp_bits, |
| unsigned int comp) |
| { |
| struct nvm_tgt_dev *dev = pblk->dev; |
| int max_secs = nvm_max_phys_sects(dev); |
| struct nvm_rq *rec_rqd; |
| struct pblk_c_ctx *rec_ctx; |
| int nr_entries = c_ctx->nr_valid + c_ctx->nr_padded; |
| |
| rec_rqd = pblk_alloc_rqd(pblk, WRITE); |
| if (IS_ERR(rec_rqd)) { |
| pr_err("pblk: could not create recovery req.\n"); |
| return -ENOMEM; |
| } |
| |
| rec_ctx = nvm_rq_to_pdu(rec_rqd); |
| |
| /* Copy completion bitmap, but exclude the first X completed entries */ |
| bitmap_shift_right((unsigned long int *)&rec_rqd->ppa_status, |
| (unsigned long int *)comp_bits, |
| comp, max_secs); |
| |
| /* Save the context for the entries that need to be re-written and |
| * update current context with the completed entries. |
| */ |
| rec_ctx->sentry = pblk_rb_wrap_pos(&pblk->rwb, c_ctx->sentry + comp); |
| if (comp >= c_ctx->nr_valid) { |
| rec_ctx->nr_valid = 0; |
| rec_ctx->nr_padded = nr_entries - comp; |
| |
| c_ctx->nr_padded = comp - c_ctx->nr_valid; |
| } else { |
| rec_ctx->nr_valid = c_ctx->nr_valid - comp; |
| rec_ctx->nr_padded = c_ctx->nr_padded; |
| |
| c_ctx->nr_valid = comp; |
| c_ctx->nr_padded = 0; |
| } |
| |
| recovery->rqd = rec_rqd; |
| recovery->pblk = pblk; |
| |
| return 0; |
| } |
| |
| __le64 *pblk_recov_get_lba_list(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 NULL; |
| |
| if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) |
| return NULL; |
| |
| return emeta_to_lbas(pblk, emeta_buf); |
| } |
| |
| 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; |
| int data_start; |
| int nr_data_lbas, nr_valid_lbas, nr_lbas = 0; |
| int i; |
| |
| lba_list = pblk_recov_get_lba_list(pblk, emeta_buf); |
| if (!lba_list) |
| return 1; |
| |
| data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; |
| nr_data_lbas = lm->sec_per_line - lm->emeta_sec[0]; |
| nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas); |
| |
| for (i = data_start; i < nr_data_lbas && nr_lbas < nr_valid_lbas; i++) { |
| struct ppa_addr ppa; |
| int pos; |
| |
| ppa = addr_to_pblk_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) |
| pr_err("pblk: line %d - inconsistent lba list(%llu/%d)\n", |
| line->id, emeta_buf->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->sec_per_blk; |
| } |
| |
| 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; |
| DECLARE_COMPLETION_ONSTACK(wait); |
| |
| 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->sec_size; |
| |
| 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; |
| rqd->end_io = pblk_end_io_sync; |
| rqd->private = &wait; |
| |
| 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_dev_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_dev_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(pblk, rqd); |
| if (ret) { |
| pr_err("pblk: I/O submission failed: %d\n", ret); |
| return ret; |
| } |
| |
| if (!wait_for_completion_io_timeout(&wait, |
| msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { |
| pr_err("pblk: L2P recovery read timed out\n"); |
| return -EINTR; |
| } |
| atomic_dec(&pblk->inflight_io); |
| reinit_completion(&wait); |
| |
| /* 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) { |
| pr_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; |
| struct nvm_tgt_dev *dev = pblk->dev; |
| |
| kref_put(&pad_rq->ref, pblk_recov_complete); |
| nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); |
| pblk_free_rqd(pblk, rqd, WRITE); |
| } |
| |
| 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(pblk->max_write_pgs * geo->sec_size); |
| 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) { |
| pr_err("pblk: corrupted pad line %d\n", line->id); |
| goto free_rq; |
| } |
| |
| rq_len = rq_ppas * geo->sec_size; |
| |
| meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); |
| if (!meta_list) { |
| ret = -ENOMEM; |
| goto free_data; |
| } |
| |
| ppa_list = (void *)(meta_list) + pblk_dma_meta_size; |
| dma_ppa_list = dma_meta_list + pblk_dma_meta_size; |
| |
| rqd = pblk_alloc_rqd(pblk, WRITE); |
| if (IS_ERR(rqd)) { |
| ret = PTR_ERR(rqd); |
| goto fail_free_meta; |
| } |
| memset(rqd, 0, pblk_w_rq_size); |
| |
| bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL); |
| if (IS_ERR(bio)) { |
| ret = PTR_ERR(bio); |
| goto fail_free_rqd; |
| } |
| |
| bio->bi_iter.bi_sector = 0; /* internal bio */ |
| bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
| |
| rqd->bio = bio; |
| rqd->opcode = NVM_OP_PWRITE; |
| rqd->flags = pblk_set_progr_mode(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_pblk_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_pblk_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); |
| |
| ret = pblk_submit_io(pblk, rqd); |
| if (ret) { |
| pr_err("pblk: I/O submission failed: %d\n", ret); |
| goto free_data; |
| } |
| |
| atomic_dec(&pblk->inflight_io); |
| |
| 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))) { |
| pr_err("pblk: pad write timed out\n"); |
| ret = -ETIME; |
| } |
| |
| free_rq: |
| kfree(pad_rq); |
| free_data: |
| vfree(data); |
| return ret; |
| |
| fail_free_rqd: |
| pblk_free_rqd(pblk, rqd, WRITE); |
| fail_free_meta: |
| nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); |
| kfree(pad_rq); |
| 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; |
| DECLARE_COMPLETION_ONSTACK(wait); |
| |
| 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->sec_size; |
| |
| 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; |
| rqd->end_io = pblk_end_io_sync; |
| rqd->private = &wait; |
| |
| 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_dev_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_dev_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(pblk, rqd); |
| if (ret) { |
| pr_err("pblk: I/O submission failed: %d\n", ret); |
| return ret; |
| } |
| |
| if (!wait_for_completion_io_timeout(&wait, |
| msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { |
| pr_err("pblk: L2P recovery read timed out\n"); |
| } |
| atomic_dec(&pblk->inflight_io); |
| reinit_completion(&wait); |
| |
| /* 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) |
| pr_err("pblk: OOB padding failed (err:%d)\n", ret); |
| |
| ret = pblk_recov_read_oob(pblk, line, p, r_ptr); |
| if (ret) |
| pr_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); |
| DECLARE_COMPLETION_ONSTACK(wait); |
| |
| 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->sec_size; |
| |
| 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; |
| rqd->end_io = pblk_end_io_sync; |
| rqd->private = &wait; |
| |
| 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_dev_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_dev_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(pblk, rqd); |
| if (ret) { |
| pr_err("pblk: I/O submission failed: %d\n", ret); |
| bio_put(bio); |
| return ret; |
| } |
| |
| if (!wait_for_completion_io_timeout(&wait, |
| msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { |
| pr_err("pblk: L2P recovery read timed out\n"); |
| } |
| atomic_dec(&pblk->inflight_io); |
| reinit_completion(&wait); |
| |
| /* 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; |
| |
| rqd = pblk_alloc_rqd(pblk, READ); |
| if (IS_ERR(rqd)) |
| return PTR_ERR(rqd); |
| |
| meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); |
| if (!meta_list) { |
| ret = -ENOMEM; |
| goto free_rqd; |
| } |
| |
| 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->sec_size, GFP_KERNEL); |
| if (!data) { |
| ret = -ENOMEM; |
| goto free_meta_list; |
| } |
| |
| 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) { |
| pr_err("pblk: could not recover L2P from OOB\n"); |
| goto out; |
| } |
| |
| if (!done) { |
| ret = pblk_recov_scan_all_oob(pblk, line, p); |
| if (ret) { |
| pr_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); |
| free_rqd: |
| pblk_free_rqd(pblk, rqd, READ); |
| |
| 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); |
| } |
| |
| struct pblk_line *pblk_recov_l2p(struct pblk *pblk) |
| { |
| struct nvm_tgt_dev *dev = pblk->dev; |
| struct nvm_geo *geo = &dev->geo; |
| 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); |
| |
| /* 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 (le16_to_cpu(smeta_buf->header.version) != 1) { |
| pr_err("pblk: found incompatible line version %u\n", |
| smeta_buf->header.version); |
| 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)) { |
| pr_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++; |
| pr_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) { |
| int off, nr_bb; |
| |
| recovered_lines++; |
| /* Calculate where emeta starts based on the line bb */ |
| off = lm->sec_per_line - lm->emeta_sec[0]; |
| nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line); |
| off -= nr_bb * geo->sec_per_pl; |
| |
| line->emeta_ssec = off; |
| 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_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); |
| |
| mempool_free(line->map_bitmap, pblk->line_meta_pool); |
| line->map_bitmap = NULL; |
| line->smeta = NULL; |
| line->emeta = NULL; |
| } else { |
| if (open_lines > 1) |
| pr_err("pblk: failed to recover L2P\n"); |
| |
| open_lines++; |
| line->meta_line = meta_line; |
| data_line = line; |
| } |
| } |
| |
| spin_lock(&l_mg->free_lock); |
| if (!open_lines) { |
| WARN_ON_ONCE(!test_and_clear_bit(meta_line, |
| &l_mg->meta_bitmap)); |
| pblk_line_replace_data(pblk); |
| } else { |
| /* 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); |
| pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next); |
| } |
| |
| out: |
| if (found_lines != recovered_lines) |
| pr_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) { |
| pr_err("pblk: Tear down padding failed (%d)\n", ret); |
| return ret; |
| } |
| |
| pblk_line_close_meta(pblk, line); |
| return ret; |
| } |