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![Jia-Ju Bai](/assets/img/avatar_default.png)
The driver may sleep with holding a spinlock. The function call paths (from bottom to top) in Linux-4.16 are: [FUNC] nvm_dev_dma_alloc(GFP_KERNEL) drivers/lightnvm/pblk-core.c, 754: nvm_dev_dma_alloc in pblk_line_submit_smeta_io drivers/lightnvm/pblk-core.c, 1048: pblk_line_submit_smeta_io in pblk_line_init_bb drivers/lightnvm/pblk-core.c, 1434: pblk_line_init_bb in pblk_line_replace_data drivers/lightnvm/pblk-recovery.c, 980: pblk_line_replace_data in pblk_recov_l2p drivers/lightnvm/pblk-recovery.c, 976: spin_lock in pblk_recov_l2p [FUNC] bio_map_kern(GFP_KERNEL) drivers/lightnvm/pblk-core.c, 762: bio_map_kern in pblk_line_submit_smeta_io drivers/lightnvm/pblk-core.c, 1048: pblk_line_submit_smeta_io in pblk_line_init_bb drivers/lightnvm/pblk-core.c, 1434: pblk_line_init_bb in pblk_line_replace_data drivers/lightnvm/pblk-recovery.c, 980: pblk_line_replace_data in pblk_recov_l2p drivers/lightnvm/pblk-recovery.c, 976: spin_lock in pblk_recov_l2p To fix these bugs, the call to pblk_line_replace_data() is moved out of the spinlock protection. These bugs are found by my static analysis tool DSAC. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Reviewed-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
1021 lines
25 KiB
C
1021 lines
25 KiB
C
/*
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* Copyright (C) 2016 CNEX Labs
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* Initial: Javier Gonzalez <javier@cnexlabs.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* pblk-recovery.c - pblk's recovery path
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*/
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#include "pblk.h"
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#include "pblk-trace.h"
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int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf)
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{
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u32 crc;
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crc = pblk_calc_emeta_crc(pblk, emeta_buf);
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if (le32_to_cpu(emeta_buf->crc) != crc)
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return 1;
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if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC)
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return 1;
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return 0;
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}
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static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct pblk_line_meta *lm = &pblk->lm;
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struct pblk_emeta *emeta = line->emeta;
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struct line_emeta *emeta_buf = emeta->buf;
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__le64 *lba_list;
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u64 data_start, data_end;
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u64 nr_valid_lbas, nr_lbas = 0;
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u64 i;
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lba_list = emeta_to_lbas(pblk, emeta_buf);
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if (!lba_list)
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return 1;
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data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec;
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data_end = line->emeta_ssec;
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nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas);
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for (i = data_start; i < data_end; i++) {
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struct ppa_addr ppa;
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int pos;
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ppa = addr_to_gen_ppa(pblk, i, line->id);
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pos = pblk_ppa_to_pos(geo, ppa);
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/* Do not update bad blocks */
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if (test_bit(pos, line->blk_bitmap))
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continue;
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if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) {
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spin_lock(&line->lock);
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if (test_and_set_bit(i, line->invalid_bitmap))
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WARN_ONCE(1, "pblk: rec. double invalidate:\n");
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else
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le32_add_cpu(line->vsc, -1);
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spin_unlock(&line->lock);
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continue;
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}
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pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa);
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nr_lbas++;
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}
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if (nr_valid_lbas != nr_lbas)
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pblk_err(pblk, "line %d - inconsistent lba list(%llu/%llu)\n",
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line->id, nr_valid_lbas, nr_lbas);
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line->left_msecs = 0;
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return 0;
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}
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static int pblk_calc_sec_in_line(struct pblk *pblk, struct pblk_line *line)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct pblk_line_meta *lm = &pblk->lm;
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int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line);
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return lm->sec_per_line - lm->smeta_sec - lm->emeta_sec[0] -
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nr_bb * geo->clba;
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}
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struct pblk_recov_alloc {
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struct ppa_addr *ppa_list;
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struct pblk_sec_meta *meta_list;
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struct nvm_rq *rqd;
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void *data;
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dma_addr_t dma_ppa_list;
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dma_addr_t dma_meta_list;
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};
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static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line,
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struct pblk_recov_alloc p, u64 r_ptr)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct ppa_addr *ppa_list;
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struct pblk_sec_meta *meta_list;
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struct nvm_rq *rqd;
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struct bio *bio;
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void *data;
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dma_addr_t dma_ppa_list, dma_meta_list;
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u64 r_ptr_int;
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int left_ppas;
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int rq_ppas, rq_len;
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int i, j;
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int ret = 0;
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ppa_list = p.ppa_list;
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meta_list = p.meta_list;
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rqd = p.rqd;
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data = p.data;
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dma_ppa_list = p.dma_ppa_list;
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dma_meta_list = p.dma_meta_list;
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left_ppas = line->cur_sec - r_ptr;
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if (!left_ppas)
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return 0;
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r_ptr_int = r_ptr;
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next_read_rq:
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memset(rqd, 0, pblk_g_rq_size);
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rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
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if (!rq_ppas)
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rq_ppas = pblk->min_write_pgs;
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rq_len = rq_ppas * geo->csecs;
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bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
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if (IS_ERR(bio))
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return PTR_ERR(bio);
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bio->bi_iter.bi_sector = 0; /* internal bio */
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bio_set_op_attrs(bio, REQ_OP_READ, 0);
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rqd->bio = bio;
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rqd->opcode = NVM_OP_PREAD;
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rqd->meta_list = meta_list;
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rqd->nr_ppas = rq_ppas;
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rqd->ppa_list = ppa_list;
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rqd->dma_ppa_list = dma_ppa_list;
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rqd->dma_meta_list = dma_meta_list;
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if (pblk_io_aligned(pblk, rq_ppas))
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rqd->is_seq = 1;
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ppa_list = nvm_rq_to_ppa_list(rqd);
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for (i = 0; i < rqd->nr_ppas; ) {
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struct ppa_addr ppa;
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int pos;
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ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
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pos = pblk_ppa_to_pos(geo, ppa);
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while (test_bit(pos, line->blk_bitmap)) {
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r_ptr_int += pblk->min_write_pgs;
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ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
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pos = pblk_ppa_to_pos(geo, ppa);
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}
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for (j = 0; j < pblk->min_write_pgs; j++, i++, r_ptr_int++)
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ppa_list[i] =
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addr_to_gen_ppa(pblk, r_ptr_int, line->id);
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}
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/* If read fails, more padding is needed */
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ret = pblk_submit_io_sync(pblk, rqd);
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if (ret) {
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pblk_err(pblk, "I/O submission failed: %d\n", ret);
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return ret;
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}
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atomic_dec(&pblk->inflight_io);
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/* At this point, the read should not fail. If it does, it is a problem
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* we cannot recover from here. Need FTL log.
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*/
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if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) {
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pblk_err(pblk, "L2P recovery failed (%d)\n", rqd->error);
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return -EINTR;
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}
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for (i = 0; i < rqd->nr_ppas; i++) {
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u64 lba = le64_to_cpu(meta_list[i].lba);
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if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
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continue;
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pblk_update_map(pblk, lba, ppa_list[i]);
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}
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left_ppas -= rq_ppas;
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if (left_ppas > 0)
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goto next_read_rq;
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return 0;
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}
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static void pblk_recov_complete(struct kref *ref)
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{
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struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref);
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complete(&pad_rq->wait);
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}
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static void pblk_end_io_recov(struct nvm_rq *rqd)
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{
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
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struct pblk_pad_rq *pad_rq = rqd->private;
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struct pblk *pblk = pad_rq->pblk;
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pblk_up_chunk(pblk, ppa_list[0]);
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pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
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atomic_dec(&pblk->inflight_io);
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kref_put(&pad_rq->ref, pblk_recov_complete);
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}
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static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
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int left_ppas)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct ppa_addr *ppa_list;
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struct pblk_sec_meta *meta_list;
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struct pblk_pad_rq *pad_rq;
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struct nvm_rq *rqd;
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struct bio *bio;
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void *data;
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dma_addr_t dma_ppa_list, dma_meta_list;
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__le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
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u64 w_ptr = line->cur_sec;
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int left_line_ppas, rq_ppas, rq_len;
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int i, j;
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int ret = 0;
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spin_lock(&line->lock);
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left_line_ppas = line->left_msecs;
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spin_unlock(&line->lock);
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pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL);
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if (!pad_rq)
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return -ENOMEM;
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data = vzalloc(array_size(pblk->max_write_pgs, geo->csecs));
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if (!data) {
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ret = -ENOMEM;
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goto free_rq;
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}
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pad_rq->pblk = pblk;
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init_completion(&pad_rq->wait);
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kref_init(&pad_rq->ref);
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next_pad_rq:
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rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
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if (rq_ppas < pblk->min_write_pgs) {
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pblk_err(pblk, "corrupted pad line %d\n", line->id);
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goto fail_free_pad;
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}
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rq_len = rq_ppas * geo->csecs;
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meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
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if (!meta_list) {
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ret = -ENOMEM;
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goto fail_free_pad;
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}
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ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
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dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
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bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
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PBLK_VMALLOC_META, GFP_KERNEL);
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if (IS_ERR(bio)) {
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ret = PTR_ERR(bio);
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goto fail_free_meta;
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}
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bio->bi_iter.bi_sector = 0; /* internal bio */
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bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
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rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
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rqd->bio = bio;
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rqd->opcode = NVM_OP_PWRITE;
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rqd->is_seq = 1;
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rqd->meta_list = meta_list;
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rqd->nr_ppas = rq_ppas;
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rqd->ppa_list = ppa_list;
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rqd->dma_ppa_list = dma_ppa_list;
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rqd->dma_meta_list = dma_meta_list;
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rqd->end_io = pblk_end_io_recov;
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rqd->private = pad_rq;
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for (i = 0; i < rqd->nr_ppas; ) {
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struct ppa_addr ppa;
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int pos;
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w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
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ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
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pos = pblk_ppa_to_pos(geo, ppa);
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while (test_bit(pos, line->blk_bitmap)) {
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w_ptr += pblk->min_write_pgs;
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ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
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pos = pblk_ppa_to_pos(geo, ppa);
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}
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for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) {
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struct ppa_addr dev_ppa;
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__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
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dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
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pblk_map_invalidate(pblk, dev_ppa);
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lba_list[w_ptr] = meta_list[i].lba = addr_empty;
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rqd->ppa_list[i] = dev_ppa;
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}
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}
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kref_get(&pad_rq->ref);
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pblk_down_chunk(pblk, rqd->ppa_list[0]);
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ret = pblk_submit_io(pblk, rqd);
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if (ret) {
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pblk_err(pblk, "I/O submission failed: %d\n", ret);
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pblk_up_chunk(pblk, rqd->ppa_list[0]);
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goto fail_free_bio;
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}
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left_line_ppas -= rq_ppas;
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left_ppas -= rq_ppas;
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if (left_ppas && left_line_ppas)
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goto next_pad_rq;
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kref_put(&pad_rq->ref, pblk_recov_complete);
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if (!wait_for_completion_io_timeout(&pad_rq->wait,
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msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
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pblk_err(pblk, "pad write timed out\n");
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ret = -ETIME;
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}
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if (!pblk_line_is_full(line))
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pblk_err(pblk, "corrupted padded line: %d\n", line->id);
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vfree(data);
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free_rq:
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kfree(pad_rq);
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return ret;
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fail_free_bio:
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bio_put(bio);
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fail_free_meta:
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nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
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fail_free_pad:
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kfree(pad_rq);
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vfree(data);
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return ret;
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}
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static int pblk_pad_distance(struct pblk *pblk, struct pblk_line *line)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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int distance = geo->mw_cunits * geo->all_luns * geo->ws_opt;
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return (distance > line->left_msecs) ? line->left_msecs : distance;
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}
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/* When this function is called, it means that not all upper pages have been
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* written in a page that contains valid data. In order to recover this data, we
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* first find the write pointer on the device, then we pad all necessary
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* sectors, and finally attempt to read the valid data
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*/
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static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
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struct pblk_recov_alloc p)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct ppa_addr *ppa_list;
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struct pblk_sec_meta *meta_list;
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struct nvm_rq *rqd;
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struct bio *bio;
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void *data;
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dma_addr_t dma_ppa_list, dma_meta_list;
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u64 w_ptr = 0, r_ptr;
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int rq_ppas, rq_len;
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int i, j;
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int ret = 0;
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int rec_round;
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int left_ppas = pblk_calc_sec_in_line(pblk, line) - line->cur_sec;
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ppa_list = p.ppa_list;
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meta_list = p.meta_list;
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rqd = p.rqd;
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data = p.data;
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dma_ppa_list = p.dma_ppa_list;
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dma_meta_list = p.dma_meta_list;
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/* we could recover up until the line write pointer */
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r_ptr = line->cur_sec;
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rec_round = 0;
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next_rq:
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memset(rqd, 0, pblk_g_rq_size);
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rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
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if (!rq_ppas)
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rq_ppas = pblk->min_write_pgs;
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rq_len = rq_ppas * geo->csecs;
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bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
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if (IS_ERR(bio))
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return PTR_ERR(bio);
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|
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->is_seq = 1;
|
|
|
|
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, line);
|
|
|
|
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->is_seq = 1;
|
|
|
|
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;
|
|
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
|
|
line->state);
|
|
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, l_mg->bitmap_pool);
|
|
line->map_bitmap = NULL;
|
|
line->smeta = NULL;
|
|
line->emeta = NULL;
|
|
} else {
|
|
if (open_lines > 1)
|
|
pblk_err(pblk, "failed to recover L2P\n");
|
|
|
|
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
|
|
line->state);
|
|
|
|
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;
|
|
}
|