cregit-Linux how code gets into the kernel

Release 4.14 drivers/lightnvm/pblk-recovery.c

Directory: drivers/lightnvm
/*
 * 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); }

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Javier González277100.00%1100.00%
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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; }

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Javier González228100.00%1100.00%
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__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); }

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Javier González66100.00%2100.00%
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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; }

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Javier González30099.01%266.67%
Dan Carpenter30.99%133.33%
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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; }

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Javier González81100.00%2100.00%
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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; }

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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); }

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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); }

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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; }

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Javier González810100.00%7100.00%
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/* 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; }

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Javier González770100.00%4100.00%
Total770100.00%4100.00%


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; }

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PersonTokensPropCommitsCommitProp
Javier González686100.00%4100.00%
Total686100.00%4100.00%

/* 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; }

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Javier González313100.00%1100.00%
Total313100.00%1100.00%

/* 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); }

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PersonTokensPropCommitsCommitProp
Javier González61100.00%1100.00%
Total61100.00%1100.00%


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; }

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PersonTokensPropCommitsCommitProp
Javier González948100.00%3100.00%
Total948100.00%3100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Javier González98100.00%3100.00%
Total98100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Javier González542399.94%1090.91%
Dan Carpenter30.06%19.09%
Total5426100.00%11100.00%
Directory: drivers/lightnvm
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