diff options
Diffstat (limited to 'drivers/lightnvm/pblk-recovery.c')
| -rw-r--r-- | drivers/lightnvm/pblk-recovery.c | 1056 |
1 files changed, 0 insertions, 1056 deletions
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c deleted file mode 100644 index cb556e06673e..000000000000 --- a/drivers/lightnvm/pblk-recovery.c +++ /dev/null @@ -1,1056 +0,0 @@ -/* - * 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; - - pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas); - - bio_put(rqd->bio); - nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); - pblk_free_rqd(pblk, rqd, WRITE); - - 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(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 fail_free_pad; - } - - 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 fail_free_pad; - } - - 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; - } - - 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_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); - pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas); - - ret = pblk_submit_io(pblk, rqd); - if (ret) { - pr_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))) { - pr_err("pblk: pad write timed out\n"); - ret = -ETIME; - } - - if (!pblk_line_is_full(line)) - pr_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_rqd: - pblk_free_rqd(pblk, rqd, WRITE); -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; - 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; -} |