diff options
Diffstat (limited to 'drivers/lightnvm/pblk-core.c')
| -rw-r--r-- | drivers/lightnvm/pblk-core.c | 2148 |
1 files changed, 2148 insertions, 0 deletions
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c new file mode 100644 index 000000000..97c687314 --- /dev/null +++ b/drivers/lightnvm/pblk-core.c @@ -0,0 +1,2148 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016 CNEX Labs + * Initial release: Javier Gonzalez <javier@cnexlabs.com> + * Matias Bjorling <matias@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-core.c - pblk's core functionality + * + */ + +#define CREATE_TRACE_POINTS + +#include "pblk.h" +#include "pblk-trace.h" + +static void pblk_line_mark_bb(struct work_struct *work) +{ + struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws, + ws); + struct pblk *pblk = line_ws->pblk; + struct nvm_tgt_dev *dev = pblk->dev; + struct ppa_addr *ppa = line_ws->priv; + int ret; + + ret = nvm_set_chunk_meta(dev, ppa, 1, NVM_BLK_T_GRWN_BAD); + if (ret) { + struct pblk_line *line; + int pos; + + line = pblk_ppa_to_line(pblk, *ppa); + pos = pblk_ppa_to_pos(&dev->geo, *ppa); + + pblk_err(pblk, "failed to mark bb, line:%d, pos:%d\n", + line->id, pos); + } + + kfree(ppa); + mempool_free(line_ws, &pblk->gen_ws_pool); +} + +static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line, + struct ppa_addr ppa_addr) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct ppa_addr *ppa; + int pos = pblk_ppa_to_pos(geo, ppa_addr); + + pblk_debug(pblk, "erase failed: line:%d, pos:%d\n", line->id, pos); + atomic_long_inc(&pblk->erase_failed); + + atomic_dec(&line->blk_in_line); + if (test_and_set_bit(pos, line->blk_bitmap)) + pblk_err(pblk, "attempted to erase bb: line:%d, pos:%d\n", + line->id, pos); + + /* Not necessary to mark bad blocks on 2.0 spec. */ + if (geo->version == NVM_OCSSD_SPEC_20) + return; + + ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC); + if (!ppa) + return; + + *ppa = ppa_addr; + pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb, + GFP_ATOMIC, pblk->bb_wq); +} + +static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct nvm_chk_meta *chunk; + struct pblk_line *line; + int pos; + + line = pblk_ppa_to_line(pblk, rqd->ppa_addr); + pos = pblk_ppa_to_pos(geo, rqd->ppa_addr); + chunk = &line->chks[pos]; + + atomic_dec(&line->left_seblks); + + if (rqd->error) { + trace_pblk_chunk_reset(pblk_disk_name(pblk), + &rqd->ppa_addr, PBLK_CHUNK_RESET_FAILED); + + chunk->state = NVM_CHK_ST_OFFLINE; + pblk_mark_bb(pblk, line, rqd->ppa_addr); + } else { + trace_pblk_chunk_reset(pblk_disk_name(pblk), + &rqd->ppa_addr, PBLK_CHUNK_RESET_DONE); + + chunk->state = NVM_CHK_ST_FREE; + } + + trace_pblk_chunk_state(pblk_disk_name(pblk), &rqd->ppa_addr, + chunk->state); + + atomic_dec(&pblk->inflight_io); +} + +/* Erase completion assumes that only one block is erased at the time */ +static void pblk_end_io_erase(struct nvm_rq *rqd) +{ + struct pblk *pblk = rqd->private; + + __pblk_end_io_erase(pblk, rqd); + mempool_free(rqd, &pblk->e_rq_pool); +} + +/* + * Get information for all chunks from the device. + * + * The caller is responsible for freeing (vmalloc) the returned structure + */ +struct nvm_chk_meta *pblk_get_chunk_meta(struct pblk *pblk) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct nvm_chk_meta *meta; + struct ppa_addr ppa; + unsigned long len; + int ret; + + ppa.ppa = 0; + + len = geo->all_chunks * sizeof(*meta); + meta = vzalloc(len); + if (!meta) + return ERR_PTR(-ENOMEM); + + ret = nvm_get_chunk_meta(dev, ppa, geo->all_chunks, meta); + if (ret) { + vfree(meta); + return ERR_PTR(-EIO); + } + + return meta; +} + +struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk, + struct nvm_chk_meta *meta, + struct ppa_addr ppa) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + int ch_off = ppa.m.grp * geo->num_chk * geo->num_lun; + int lun_off = ppa.m.pu * geo->num_chk; + int chk_off = ppa.m.chk; + + return meta + ch_off + lun_off + chk_off; +} + +void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line, + u64 paddr) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct list_head *move_list = NULL; + + /* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P + * table is modified with reclaimed sectors, a check is done to endure + * that newer updates are not overwritten. + */ + spin_lock(&line->lock); + WARN_ON(line->state == PBLK_LINESTATE_FREE); + + if (test_and_set_bit(paddr, line->invalid_bitmap)) { + WARN_ONCE(1, "pblk: double invalidate\n"); + spin_unlock(&line->lock); + return; + } + le32_add_cpu(line->vsc, -1); + + if (line->state == PBLK_LINESTATE_CLOSED) + move_list = pblk_line_gc_list(pblk, line); + spin_unlock(&line->lock); + + if (move_list) { + spin_lock(&l_mg->gc_lock); + spin_lock(&line->lock); + /* Prevent moving a line that has just been chosen for GC */ + if (line->state == PBLK_LINESTATE_GC) { + spin_unlock(&line->lock); + spin_unlock(&l_mg->gc_lock); + return; + } + spin_unlock(&line->lock); + + list_move_tail(&line->list, move_list); + spin_unlock(&l_mg->gc_lock); + } +} + +void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa) +{ + struct pblk_line *line; + u64 paddr; + +#ifdef CONFIG_NVM_PBLK_DEBUG + /* Callers must ensure that the ppa points to a device address */ + BUG_ON(pblk_addr_in_cache(ppa)); + BUG_ON(pblk_ppa_empty(ppa)); +#endif + + line = pblk_ppa_to_line(pblk, ppa); + paddr = pblk_dev_ppa_to_line_addr(pblk, ppa); + + __pblk_map_invalidate(pblk, line, paddr); +} + +static void pblk_invalidate_range(struct pblk *pblk, sector_t slba, + unsigned int nr_secs) +{ + sector_t lba; + + spin_lock(&pblk->trans_lock); + for (lba = slba; lba < slba + nr_secs; lba++) { + struct ppa_addr ppa; + + ppa = pblk_trans_map_get(pblk, lba); + + if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa)) + pblk_map_invalidate(pblk, ppa); + + pblk_ppa_set_empty(&ppa); + pblk_trans_map_set(pblk, lba, ppa); + } + spin_unlock(&pblk->trans_lock); +} + +int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct nvm_tgt_dev *dev = pblk->dev; + + rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, + &rqd->dma_meta_list); + if (!rqd->meta_list) + return -ENOMEM; + + if (rqd->nr_ppas == 1) + return 0; + + rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size(pblk); + rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size(pblk); + + return 0; +} + +void pblk_free_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct nvm_tgt_dev *dev = pblk->dev; + + if (rqd->meta_list) + nvm_dev_dma_free(dev->parent, rqd->meta_list, + rqd->dma_meta_list); +} + +/* Caller must guarantee that the request is a valid type */ +struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type) +{ + mempool_t *pool; + struct nvm_rq *rqd; + int rq_size; + + switch (type) { + case PBLK_WRITE: + case PBLK_WRITE_INT: + pool = &pblk->w_rq_pool; + rq_size = pblk_w_rq_size; + break; + case PBLK_READ: + pool = &pblk->r_rq_pool; + rq_size = pblk_g_rq_size; + break; + default: + pool = &pblk->e_rq_pool; + rq_size = pblk_g_rq_size; + } + + rqd = mempool_alloc(pool, GFP_KERNEL); + memset(rqd, 0, rq_size); + + return rqd; +} + +/* Typically used on completion path. Cannot guarantee request consistency */ +void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type) +{ + mempool_t *pool; + + switch (type) { + case PBLK_WRITE: + kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap); + fallthrough; + case PBLK_WRITE_INT: + pool = &pblk->w_rq_pool; + break; + case PBLK_READ: + pool = &pblk->r_rq_pool; + break; + case PBLK_ERASE: + pool = &pblk->e_rq_pool; + break; + default: + pblk_err(pblk, "trying to free unknown rqd type\n"); + return; + } + + pblk_free_rqd_meta(pblk, rqd); + mempool_free(rqd, pool); +} + +void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off, + int nr_pages) +{ + struct bio_vec *bv; + struct page *page; + int i, e, nbv = 0; + + for (i = 0; i < bio->bi_vcnt; i++) { + bv = &bio->bi_io_vec[i]; + page = bv->bv_page; + for (e = 0; e < bv->bv_len; e += PBLK_EXPOSED_PAGE_SIZE, nbv++) + if (nbv >= off) + mempool_free(page++, &pblk->page_bio_pool); + } +} + +int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags, + int nr_pages) +{ + struct request_queue *q = pblk->dev->q; + struct page *page; + int i, ret; + + for (i = 0; i < nr_pages; i++) { + page = mempool_alloc(&pblk->page_bio_pool, flags); + + ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0); + if (ret != PBLK_EXPOSED_PAGE_SIZE) { + pblk_err(pblk, "could not add page to bio\n"); + mempool_free(page, &pblk->page_bio_pool); + goto err; + } + } + + return 0; +err: + pblk_bio_free_pages(pblk, bio, (bio->bi_vcnt - i), i); + return -1; +} + +void pblk_write_kick(struct pblk *pblk) +{ + wake_up_process(pblk->writer_ts); + mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000)); +} + +void pblk_write_timer_fn(struct timer_list *t) +{ + struct pblk *pblk = from_timer(pblk, t, wtimer); + + /* kick the write thread every tick to flush outstanding data */ + pblk_write_kick(pblk); +} + +void pblk_write_should_kick(struct pblk *pblk) +{ + unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb); + + if (secs_avail >= pblk->min_write_pgs_data) + pblk_write_kick(pblk); +} + +static void pblk_wait_for_meta(struct pblk *pblk) +{ + do { + if (!atomic_read(&pblk->inflight_io)) + break; + + schedule(); + } while (1); +} + +static void pblk_flush_writer(struct pblk *pblk) +{ + pblk_rb_flush(&pblk->rwb); + do { + if (!pblk_rb_sync_count(&pblk->rwb)) + break; + + pblk_write_kick(pblk); + schedule(); + } while (1); +} + +struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct list_head *move_list = NULL; + int packed_meta = (le32_to_cpu(*line->vsc) / pblk->min_write_pgs_data) + * (pblk->min_write_pgs - pblk->min_write_pgs_data); + int vsc = le32_to_cpu(*line->vsc) + packed_meta; + + lockdep_assert_held(&line->lock); + + if (line->w_err_gc->has_write_err) { + if (line->gc_group != PBLK_LINEGC_WERR) { + line->gc_group = PBLK_LINEGC_WERR; + move_list = &l_mg->gc_werr_list; + pblk_rl_werr_line_in(&pblk->rl); + } + } else if (!vsc) { + if (line->gc_group != PBLK_LINEGC_FULL) { + line->gc_group = PBLK_LINEGC_FULL; + move_list = &l_mg->gc_full_list; + } + } else if (vsc < lm->high_thrs) { + if (line->gc_group != PBLK_LINEGC_HIGH) { + line->gc_group = PBLK_LINEGC_HIGH; + move_list = &l_mg->gc_high_list; + } + } else if (vsc < lm->mid_thrs) { + if (line->gc_group != PBLK_LINEGC_MID) { + line->gc_group = PBLK_LINEGC_MID; + move_list = &l_mg->gc_mid_list; + } + } else if (vsc < line->sec_in_line) { + if (line->gc_group != PBLK_LINEGC_LOW) { + line->gc_group = PBLK_LINEGC_LOW; + move_list = &l_mg->gc_low_list; + } + } else if (vsc == line->sec_in_line) { + if (line->gc_group != PBLK_LINEGC_EMPTY) { + line->gc_group = PBLK_LINEGC_EMPTY; + move_list = &l_mg->gc_empty_list; + } + } else { + line->state = PBLK_LINESTATE_CORRUPT; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + + line->gc_group = PBLK_LINEGC_NONE; + move_list = &l_mg->corrupt_list; + pblk_err(pblk, "corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n", + line->id, vsc, + line->sec_in_line, + lm->high_thrs, lm->mid_thrs); + } + + return move_list; +} + +void pblk_discard(struct pblk *pblk, struct bio *bio) +{ + sector_t slba = pblk_get_lba(bio); + sector_t nr_secs = pblk_get_secs(bio); + + pblk_invalidate_range(pblk, slba, nr_secs); +} + +void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd) +{ + atomic_long_inc(&pblk->write_failed); +#ifdef CONFIG_NVM_PBLK_DEBUG + pblk_print_failed_rqd(pblk, rqd, rqd->error); +#endif +} + +void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd) +{ + /* Empty page read is not necessarily an error (e.g., L2P recovery) */ + if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) { + atomic_long_inc(&pblk->read_empty); + return; + } + + switch (rqd->error) { + case NVM_RSP_WARN_HIGHECC: + atomic_long_inc(&pblk->read_high_ecc); + break; + case NVM_RSP_ERR_FAILECC: + case NVM_RSP_ERR_FAILCRC: + atomic_long_inc(&pblk->read_failed); + break; + default: + pblk_err(pblk, "unknown read error:%d\n", rqd->error); + } +#ifdef CONFIG_NVM_PBLK_DEBUG + pblk_print_failed_rqd(pblk, rqd, rqd->error); +#endif +} + +void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write) +{ + pblk->sec_per_write = sec_per_write; +} + +int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd, void *buf) +{ + struct nvm_tgt_dev *dev = pblk->dev; + + atomic_inc(&pblk->inflight_io); + +#ifdef CONFIG_NVM_PBLK_DEBUG + if (pblk_check_io(pblk, rqd)) + return NVM_IO_ERR; +#endif + + return nvm_submit_io(dev, rqd, buf); +} + +void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); + + int i; + + for (i = 0; i < rqd->nr_ppas; i++) { + struct ppa_addr *ppa = &ppa_list[i]; + struct nvm_chk_meta *chunk = pblk_dev_ppa_to_chunk(pblk, *ppa); + u64 caddr = pblk_dev_ppa_to_chunk_addr(pblk, *ppa); + + if (caddr == 0) + trace_pblk_chunk_state(pblk_disk_name(pblk), + ppa, NVM_CHK_ST_OPEN); + else if (caddr == (chunk->cnlb - 1)) + trace_pblk_chunk_state(pblk_disk_name(pblk), + ppa, NVM_CHK_ST_CLOSED); + } +} + +int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd, void *buf) +{ + struct nvm_tgt_dev *dev = pblk->dev; + int ret; + + atomic_inc(&pblk->inflight_io); + +#ifdef CONFIG_NVM_PBLK_DEBUG + if (pblk_check_io(pblk, rqd)) + return NVM_IO_ERR; +#endif + + ret = nvm_submit_io_sync(dev, rqd, buf); + + if (trace_pblk_chunk_state_enabled() && !ret && + rqd->opcode == NVM_OP_PWRITE) + pblk_check_chunk_state_update(pblk, rqd); + + return ret; +} + +static int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd, + void *buf) +{ + struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); + int ret; + + pblk_down_chunk(pblk, ppa_list[0]); + ret = pblk_submit_io_sync(pblk, rqd, buf); + pblk_up_chunk(pblk, ppa_list[0]); + + return ret; +} + +int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail, + unsigned long secs_to_flush, bool skip_meta) +{ + int max = pblk->sec_per_write; + int min = pblk->min_write_pgs; + int secs_to_sync = 0; + + if (skip_meta && pblk->min_write_pgs_data != pblk->min_write_pgs) + min = max = pblk->min_write_pgs_data; + + if (secs_avail >= max) + secs_to_sync = max; + else if (secs_avail >= min) + secs_to_sync = min * (secs_avail / min); + else if (secs_to_flush) + secs_to_sync = min; + + return secs_to_sync; +} + +void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs) +{ + u64 addr; + int i; + + spin_lock(&line->lock); + addr = find_next_zero_bit(line->map_bitmap, + pblk->lm.sec_per_line, line->cur_sec); + line->cur_sec = addr - nr_secs; + + for (i = 0; i < nr_secs; i++, line->cur_sec--) + WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap)); + spin_unlock(&line->lock); +} + +u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs) +{ + u64 addr; + int i; + + lockdep_assert_held(&line->lock); + + /* logic error: ppa out-of-bounds. Prevent generating bad address */ + if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) { + WARN(1, "pblk: page allocation out of bounds\n"); + nr_secs = pblk->lm.sec_per_line - line->cur_sec; + } + + line->cur_sec = addr = find_next_zero_bit(line->map_bitmap, + pblk->lm.sec_per_line, line->cur_sec); + for (i = 0; i < nr_secs; i++, line->cur_sec++) + WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap)); + + return addr; +} + +u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs) +{ + u64 addr; + + /* Lock needed in case a write fails and a recovery needs to remap + * failed write buffer entries + */ + spin_lock(&line->lock); + addr = __pblk_alloc_page(pblk, line, nr_secs); + line->left_msecs -= nr_secs; + WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n"); + spin_unlock(&line->lock); + + return addr; +} + +u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line) +{ + u64 paddr; + + spin_lock(&line->lock); + paddr = find_next_zero_bit(line->map_bitmap, + pblk->lm.sec_per_line, line->cur_sec); + spin_unlock(&line->lock); + + return paddr; +} + +u64 pblk_line_smeta_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; + int bit; + + /* This usually only happens on bad lines */ + bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line); + if (bit >= lm->blk_per_line) + return -1; + + return bit * geo->ws_opt; +} + +int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct ppa_addr *ppa_list; + struct nvm_rq rqd; + u64 paddr = pblk_line_smeta_start(pblk, line); + int i, ret; + + memset(&rqd, 0, sizeof(struct nvm_rq)); + + ret = pblk_alloc_rqd_meta(pblk, &rqd); + if (ret) + return ret; + + rqd.opcode = NVM_OP_PREAD; + rqd.nr_ppas = lm->smeta_sec; + rqd.is_seq = 1; + ppa_list = nvm_rq_to_ppa_list(&rqd); + + for (i = 0; i < lm->smeta_sec; i++, paddr++) + ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id); + + ret = pblk_submit_io_sync(pblk, &rqd, line->smeta); + if (ret) { + pblk_err(pblk, "smeta I/O submission failed: %d\n", ret); + goto clear_rqd; + } + + atomic_dec(&pblk->inflight_io); + + if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) { + pblk_log_read_err(pblk, &rqd); + ret = -EIO; + } + +clear_rqd: + pblk_free_rqd_meta(pblk, &rqd); + return ret; +} + +static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line, + u64 paddr) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct ppa_addr *ppa_list; + struct nvm_rq rqd; + __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf); + __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); + int i, ret; + + memset(&rqd, 0, sizeof(struct nvm_rq)); + + ret = pblk_alloc_rqd_meta(pblk, &rqd); + if (ret) + return ret; + + rqd.opcode = NVM_OP_PWRITE; + rqd.nr_ppas = lm->smeta_sec; + rqd.is_seq = 1; + ppa_list = nvm_rq_to_ppa_list(&rqd); + + for (i = 0; i < lm->smeta_sec; i++, paddr++) { + struct pblk_sec_meta *meta = pblk_get_meta(pblk, + rqd.meta_list, i); + + ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id); + meta->lba = lba_list[paddr] = addr_empty; + } + + ret = pblk_submit_io_sync_sem(pblk, &rqd, line->smeta); + if (ret) { + pblk_err(pblk, "smeta I/O submission failed: %d\n", ret); + goto clear_rqd; + } + + atomic_dec(&pblk->inflight_io); + + if (rqd.error) { + pblk_log_write_err(pblk, &rqd); + ret = -EIO; + } + +clear_rqd: + pblk_free_rqd_meta(pblk, &rqd); + return ret; +} + +int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line, + void *emeta_buf) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_line_meta *lm = &pblk->lm; + void *ppa_list_buf, *meta_list; + struct ppa_addr *ppa_list; + struct nvm_rq rqd; + u64 paddr = line->emeta_ssec; + dma_addr_t dma_ppa_list, dma_meta_list; + int min = pblk->min_write_pgs; + int left_ppas = lm->emeta_sec[0]; + int line_id = line->id; + int rq_ppas, rq_len; + int i, j; + int ret; + + meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, + &dma_meta_list); + if (!meta_list) + return -ENOMEM; + + ppa_list_buf = meta_list + pblk_dma_meta_size(pblk); + dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk); + +next_rq: + memset(&rqd, 0, sizeof(struct nvm_rq)); + + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false); + rq_len = rq_ppas * geo->csecs; + + rqd.meta_list = meta_list; + rqd.ppa_list = ppa_list_buf; + rqd.dma_meta_list = dma_meta_list; + rqd.dma_ppa_list = dma_ppa_list; + rqd.opcode = NVM_OP_PREAD; + rqd.nr_ppas = rq_ppas; + ppa_list = nvm_rq_to_ppa_list(&rqd); + + for (i = 0; i < rqd.nr_ppas; ) { + struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, line_id); + int pos = pblk_ppa_to_pos(geo, ppa); + + if (pblk_io_aligned(pblk, rq_ppas)) + rqd.is_seq = 1; + + while (test_bit(pos, line->blk_bitmap)) { + paddr += min; + if (pblk_boundary_paddr_checks(pblk, paddr)) { + ret = -EINTR; + goto free_rqd_dma; + } + + ppa = addr_to_gen_ppa(pblk, paddr, line_id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + if (pblk_boundary_paddr_checks(pblk, paddr + min)) { + ret = -EINTR; + goto free_rqd_dma; + } + + for (j = 0; j < min; j++, i++, paddr++) + ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line_id); + } + + ret = pblk_submit_io_sync(pblk, &rqd, emeta_buf); + if (ret) { + pblk_err(pblk, "emeta I/O submission failed: %d\n", ret); + goto free_rqd_dma; + } + + atomic_dec(&pblk->inflight_io); + + if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) { + pblk_log_read_err(pblk, &rqd); + ret = -EIO; + goto free_rqd_dma; + } + + emeta_buf += rq_len; + left_ppas -= rq_ppas; + if (left_ppas) + goto next_rq; + +free_rqd_dma: + nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); + return ret; +} + +static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd, + struct ppa_addr ppa) +{ + rqd->opcode = NVM_OP_ERASE; + rqd->ppa_addr = ppa; + rqd->nr_ppas = 1; + rqd->is_seq = 1; + rqd->bio = NULL; +} + +static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa) +{ + struct nvm_rq rqd = {NULL}; + int ret; + + trace_pblk_chunk_reset(pblk_disk_name(pblk), &ppa, + PBLK_CHUNK_RESET_START); + + pblk_setup_e_rq(pblk, &rqd, ppa); + + /* The write thread schedules erases so that it minimizes disturbances + * with writes. Thus, there is no need to take the LUN semaphore. + */ + ret = pblk_submit_io_sync(pblk, &rqd, NULL); + rqd.private = pblk; + __pblk_end_io_erase(pblk, &rqd); + + return ret; +} + +int pblk_line_erase(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct ppa_addr ppa; + int ret, bit = -1; + + /* Erase only good blocks, one at a time */ + do { + spin_lock(&line->lock); + bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line, + bit + 1); + if (bit >= lm->blk_per_line) { + spin_unlock(&line->lock); + break; + } + + ppa = pblk->luns[bit].bppa; /* set ch and lun */ + ppa.a.blk = line->id; + + atomic_dec(&line->left_eblks); + WARN_ON(test_and_set_bit(bit, line->erase_bitmap)); + spin_unlock(&line->lock); + + ret = pblk_blk_erase_sync(pblk, ppa); + if (ret) { + pblk_err(pblk, "failed to erase line %d\n", line->id); + return ret; + } + } while (1); + + return 0; +} + +static void pblk_line_setup_metadata(struct pblk_line *line, + struct pblk_line_mgmt *l_mg, + struct pblk_line_meta *lm) +{ + int meta_line; + + lockdep_assert_held(&l_mg->free_lock); + +retry_meta: + meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES); + if (meta_line == PBLK_DATA_LINES) { + spin_unlock(&l_mg->free_lock); + io_schedule(); + spin_lock(&l_mg->free_lock); + goto retry_meta; + } + + set_bit(meta_line, &l_mg->meta_bitmap); + line->meta_line = meta_line; + + line->smeta = l_mg->sline_meta[meta_line]; + line->emeta = l_mg->eline_meta[meta_line]; + + memset(line->smeta, 0, lm->smeta_len); + memset(line->emeta->buf, 0, lm->emeta_len[0]); + + line->emeta->mem = 0; + atomic_set(&line->emeta->sync, 0); +} + +/* For now lines are always assumed full lines. Thus, smeta former and current + * lun bitmaps are omitted. + */ +static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line, + struct pblk_line *cur) +{ + 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_emeta *emeta = line->emeta; + struct line_emeta *emeta_buf = emeta->buf; + struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta; + int nr_blk_line; + + /* After erasing the line, new bad blocks might appear and we risk + * having an invalid line + */ + nr_blk_line = lm->blk_per_line - + bitmap_weight(line->blk_bitmap, lm->blk_per_line); + if (nr_blk_line < lm->min_blk_line) { + spin_lock(&l_mg->free_lock); + spin_lock(&line->lock); + line->state = PBLK_LINESTATE_BAD; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + spin_unlock(&line->lock); + + list_add_tail(&line->list, &l_mg->bad_list); + spin_unlock(&l_mg->free_lock); + + pblk_debug(pblk, "line %d is bad\n", line->id); + + return 0; + } + + /* Run-time metadata */ + line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta); + + /* Mark LUNs allocated in this line (all for now) */ + bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len); + + smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC); + guid_copy((guid_t *)&smeta_buf->header.uuid, &pblk->instance_uuid); + smeta_buf->header.id = cpu_to_le32(line->id); + smeta_buf->header.type = cpu_to_le16(line->type); + smeta_buf->header.version_major = SMETA_VERSION_MAJOR; + smeta_buf->header.version_minor = SMETA_VERSION_MINOR; + + /* Start metadata */ + smeta_buf->seq_nr = cpu_to_le64(line->seq_nr); + smeta_buf->window_wr_lun = cpu_to_le32(geo->all_luns); + + /* Fill metadata among lines */ + if (cur) { + memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len); + smeta_buf->prev_id = cpu_to_le32(cur->id); + cur->emeta->buf->next_id = cpu_to_le32(line->id); + } else { + smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY); + } + + /* All smeta must be set at this point */ + smeta_buf->header.crc = cpu_to_le32( + pblk_calc_meta_header_crc(pblk, &smeta_buf->header)); + smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf)); + + /* End metadata */ + memcpy(&emeta_buf->header, &smeta_buf->header, + sizeof(struct line_header)); + + emeta_buf->header.version_major = EMETA_VERSION_MAJOR; + emeta_buf->header.version_minor = EMETA_VERSION_MINOR; + emeta_buf->header.crc = cpu_to_le32( + pblk_calc_meta_header_crc(pblk, &emeta_buf->header)); + + emeta_buf->seq_nr = cpu_to_le64(line->seq_nr); + emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line); + emeta_buf->nr_valid_lbas = cpu_to_le64(0); + emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY); + emeta_buf->crc = cpu_to_le32(0); + emeta_buf->prev_id = smeta_buf->prev_id; + + return 1; +} + +static int pblk_line_alloc_bitmaps(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + + line->map_bitmap = mempool_alloc(l_mg->bitmap_pool, GFP_KERNEL); + if (!line->map_bitmap) + return -ENOMEM; + + memset(line->map_bitmap, 0, lm->sec_bitmap_len); + + /* will be initialized using bb info from map_bitmap */ + line->invalid_bitmap = mempool_alloc(l_mg->bitmap_pool, GFP_KERNEL); + if (!line->invalid_bitmap) { + mempool_free(line->map_bitmap, l_mg->bitmap_pool); + line->map_bitmap = NULL; + return -ENOMEM; + } + + return 0; +} + +/* For now lines are always assumed full lines. Thus, smeta former and current + * lun bitmaps are omitted. + */ +static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line, + int init) +{ + 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; + u64 off; + int bit = -1; + int emeta_secs; + + line->sec_in_line = lm->sec_per_line; + + /* Capture bad block information on line mapping bitmaps */ + while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line, + bit + 1)) < lm->blk_per_line) { + off = bit * geo->ws_opt; + bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off, + lm->sec_per_line); + bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux, + lm->sec_per_line); + line->sec_in_line -= geo->clba; + } + + /* Mark smeta metadata sectors as bad sectors */ + bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line); + off = bit * geo->ws_opt; + bitmap_set(line->map_bitmap, off, lm->smeta_sec); + line->sec_in_line -= lm->smeta_sec; + line->cur_sec = off + lm->smeta_sec; + + if (init && pblk_line_smeta_write(pblk, line, off)) { + pblk_debug(pblk, "line smeta I/O failed. Retry\n"); + return 0; + } + + bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line); + + /* Mark emeta metadata sectors as bad sectors. We need to consider bad + * blocks to make sure that there are enough sectors to store emeta + */ + emeta_secs = lm->emeta_sec[0]; + off = lm->sec_per_line; + while (emeta_secs) { + off -= geo->ws_opt; + if (!test_bit(off, line->invalid_bitmap)) { + bitmap_set(line->invalid_bitmap, off, geo->ws_opt); + emeta_secs -= geo->ws_opt; + } + } + + line->emeta_ssec = off; + line->sec_in_line -= lm->emeta_sec[0]; + line->nr_valid_lbas = 0; + line->left_msecs = line->sec_in_line; + *line->vsc = cpu_to_le32(line->sec_in_line); + + if (lm->sec_per_line - line->sec_in_line != + bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) { + spin_lock(&line->lock); + line->state = PBLK_LINESTATE_BAD; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + spin_unlock(&line->lock); + + list_add_tail(&line->list, &l_mg->bad_list); + pblk_err(pblk, "unexpected line %d is bad\n", line->id); + + return 0; + } + + return 1; +} + +static int pblk_prepare_new_line(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + int blk_to_erase = atomic_read(&line->blk_in_line); + int i; + + for (i = 0; i < lm->blk_per_line; i++) { + struct pblk_lun *rlun = &pblk->luns[i]; + int pos = pblk_ppa_to_pos(geo, rlun->bppa); + int state = line->chks[pos].state; + + /* Free chunks should not be erased */ + if (state & NVM_CHK_ST_FREE) { + set_bit(pblk_ppa_to_pos(geo, rlun->bppa), + line->erase_bitmap); + blk_to_erase--; + } + } + + return blk_to_erase; +} + +static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + int blk_in_line = atomic_read(&line->blk_in_line); + int blk_to_erase; + + /* Bad blocks do not need to be erased */ + bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line); + + spin_lock(&line->lock); + + /* If we have not written to this line, we need to mark up free chunks + * as already erased + */ + if (line->state == PBLK_LINESTATE_NEW) { + blk_to_erase = pblk_prepare_new_line(pblk, line); + line->state = PBLK_LINESTATE_FREE; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + } else { + blk_to_erase = blk_in_line; + } + + if (blk_in_line < lm->min_blk_line) { + spin_unlock(&line->lock); + return -EAGAIN; + } + + if (line->state != PBLK_LINESTATE_FREE) { + WARN(1, "pblk: corrupted line %d, state %d\n", + line->id, line->state); + spin_unlock(&line->lock); + return -EINTR; + } + + line->state = PBLK_LINESTATE_OPEN; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + + atomic_set(&line->left_eblks, blk_to_erase); + atomic_set(&line->left_seblks, blk_to_erase); + + line->meta_distance = lm->meta_distance; + spin_unlock(&line->lock); + + kref_init(&line->ref); + atomic_set(&line->sec_to_update, 0); + + return 0; +} + +/* Line allocations in the recovery path are always single threaded */ +int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + int ret; + + spin_lock(&l_mg->free_lock); + l_mg->data_line = line; + list_del(&line->list); + + ret = pblk_line_prepare(pblk, line); + if (ret) { + list_add(&line->list, &l_mg->free_list); + spin_unlock(&l_mg->free_lock); + return ret; + } + spin_unlock(&l_mg->free_lock); + + ret = pblk_line_alloc_bitmaps(pblk, line); + if (ret) + goto fail; + + if (!pblk_line_init_bb(pblk, line, 0)) { + ret = -EINTR; + goto fail; + } + + pblk_rl_free_lines_dec(&pblk->rl, line, true); + return 0; + +fail: + spin_lock(&l_mg->free_lock); + list_add(&line->list, &l_mg->free_list); + spin_unlock(&l_mg->free_lock); + + return ret; +} + +void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + + mempool_free(line->map_bitmap, l_mg->bitmap_pool); + line->map_bitmap = NULL; + line->smeta = NULL; + line->emeta = NULL; +} + +static void pblk_line_reinit(struct pblk_line *line) +{ + *line->vsc = cpu_to_le32(EMPTY_ENTRY); + + line->map_bitmap = NULL; + line->invalid_bitmap = NULL; + line->smeta = NULL; + line->emeta = NULL; +} + +void pblk_line_free(struct pblk_line *line) +{ + struct pblk *pblk = line->pblk; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + + mempool_free(line->map_bitmap, l_mg->bitmap_pool); + mempool_free(line->invalid_bitmap, l_mg->bitmap_pool); + + pblk_line_reinit(line); +} + +struct pblk_line *pblk_line_get(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line *line; + int ret, bit; + + lockdep_assert_held(&l_mg->free_lock); + +retry: + if (list_empty(&l_mg->free_list)) { + pblk_err(pblk, "no free lines\n"); + return NULL; + } + + line = list_first_entry(&l_mg->free_list, struct pblk_line, list); + list_del(&line->list); + l_mg->nr_free_lines--; + + bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line); + if (unlikely(bit >= lm->blk_per_line)) { + spin_lock(&line->lock); + line->state = PBLK_LINESTATE_BAD; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + spin_unlock(&line->lock); + + list_add_tail(&line->list, &l_mg->bad_list); + + pblk_debug(pblk, "line %d is bad\n", line->id); + goto retry; + } + + ret = pblk_line_prepare(pblk, line); + if (ret) { + switch (ret) { + case -EAGAIN: + list_add(&line->list, &l_mg->bad_list); + goto retry; + case -EINTR: + list_add(&line->list, &l_mg->corrupt_list); + goto retry; + default: + pblk_err(pblk, "failed to prepare line %d\n", line->id); + list_add(&line->list, &l_mg->free_list); + l_mg->nr_free_lines++; + return NULL; + } + } + + return line; +} + +static struct pblk_line *pblk_line_retry(struct pblk *pblk, + struct pblk_line *line) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line *retry_line; + +retry: + spin_lock(&l_mg->free_lock); + retry_line = pblk_line_get(pblk); + if (!retry_line) { + l_mg->data_line = NULL; + spin_unlock(&l_mg->free_lock); + return NULL; + } + + retry_line->map_bitmap = line->map_bitmap; + retry_line->invalid_bitmap = line->invalid_bitmap; + retry_line->smeta = line->smeta; + retry_line->emeta = line->emeta; + retry_line->meta_line = line->meta_line; + + pblk_line_reinit(line); + + l_mg->data_line = retry_line; + spin_unlock(&l_mg->free_lock); + + pblk_rl_free_lines_dec(&pblk->rl, line, false); + + if (pblk_line_erase(pblk, retry_line)) + goto retry; + + return retry_line; +} + +static void pblk_set_space_limit(struct pblk *pblk) +{ + struct pblk_rl *rl = &pblk->rl; + + atomic_set(&rl->rb_space, 0); +} + +struct pblk_line *pblk_line_get_first_data(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line *line; + + spin_lock(&l_mg->free_lock); + line = pblk_line_get(pblk); + if (!line) { + spin_unlock(&l_mg->free_lock); + return NULL; + } + + line->seq_nr = l_mg->d_seq_nr++; + line->type = PBLK_LINETYPE_DATA; + l_mg->data_line = line; + + pblk_line_setup_metadata(line, l_mg, &pblk->lm); + + /* Allocate next line for preparation */ + l_mg->data_next = pblk_line_get(pblk); + if (!l_mg->data_next) { + /* If we cannot get a new line, we need to stop the pipeline. + * Only allow as many writes in as we can store safely and then + * fail gracefully + */ + pblk_set_space_limit(pblk); + + l_mg->data_next = NULL; + } else { + l_mg->data_next->seq_nr = l_mg->d_seq_nr++; + l_mg->data_next->type = PBLK_LINETYPE_DATA; + } + spin_unlock(&l_mg->free_lock); + + if (pblk_line_alloc_bitmaps(pblk, line)) + return NULL; + + if (pblk_line_erase(pblk, line)) { + line = pblk_line_retry(pblk, line); + if (!line) + return NULL; + } + +retry_setup: + if (!pblk_line_init_metadata(pblk, line, NULL)) { + line = pblk_line_retry(pblk, line); + if (!line) + return NULL; + + goto retry_setup; + } + + if (!pblk_line_init_bb(pblk, line, 1)) { + line = pblk_line_retry(pblk, line); + if (!line) + return NULL; + + goto retry_setup; + } + + pblk_rl_free_lines_dec(&pblk->rl, line, true); + + return line; +} + +void pblk_ppa_to_line_put(struct pblk *pblk, struct ppa_addr ppa) +{ + struct pblk_line *line; + + line = pblk_ppa_to_line(pblk, ppa); + kref_put(&line->ref, pblk_line_put_wq); +} + +void pblk_rq_to_line_put(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); + int i; + + for (i = 0; i < rqd->nr_ppas; i++) + pblk_ppa_to_line_put(pblk, ppa_list[i]); +} + +static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line) +{ + lockdep_assert_held(&pblk->l_mg.free_lock); + + pblk_set_space_limit(pblk); + pblk->state = PBLK_STATE_STOPPING; + trace_pblk_state(pblk_disk_name(pblk), pblk->state); +} + +static void pblk_line_close_meta_sync(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line *line, *tline; + LIST_HEAD(list); + + spin_lock(&l_mg->close_lock); + if (list_empty(&l_mg->emeta_list)) { + spin_unlock(&l_mg->close_lock); + return; + } + + list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev); + spin_unlock(&l_mg->close_lock); + + list_for_each_entry_safe(line, tline, &list, list) { + struct pblk_emeta *emeta = line->emeta; + + while (emeta->mem < lm->emeta_len[0]) { + int ret; + + ret = pblk_submit_meta_io(pblk, line); + if (ret) { + pblk_err(pblk, "sync meta line %d failed (%d)\n", + line->id, ret); + return; + } + } + } + + pblk_wait_for_meta(pblk); + flush_workqueue(pblk->close_wq); +} + +void __pblk_pipeline_flush(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + int ret; + + spin_lock(&l_mg->free_lock); + if (pblk->state == PBLK_STATE_RECOVERING || + pblk->state == PBLK_STATE_STOPPED) { + spin_unlock(&l_mg->free_lock); + return; + } + pblk->state = PBLK_STATE_RECOVERING; + trace_pblk_state(pblk_disk_name(pblk), pblk->state); + spin_unlock(&l_mg->free_lock); + + pblk_flush_writer(pblk); + pblk_wait_for_meta(pblk); + + ret = pblk_recov_pad(pblk); + if (ret) { + pblk_err(pblk, "could not close data on teardown(%d)\n", ret); + return; + } + + flush_workqueue(pblk->bb_wq); + pblk_line_close_meta_sync(pblk); +} + +void __pblk_pipeline_stop(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + + spin_lock(&l_mg->free_lock); + pblk->state = PBLK_STATE_STOPPED; + trace_pblk_state(pblk_disk_name(pblk), pblk->state); + l_mg->data_line = NULL; + l_mg->data_next = NULL; + spin_unlock(&l_mg->free_lock); +} + +void pblk_pipeline_stop(struct pblk *pblk) +{ + __pblk_pipeline_flush(pblk); + __pblk_pipeline_stop(pblk); +} + +struct pblk_line *pblk_line_replace_data(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line *cur, *new = NULL; + unsigned int left_seblks; + + new = l_mg->data_next; + if (!new) + goto out; + + spin_lock(&l_mg->free_lock); + cur = l_mg->data_line; + l_mg->data_line = new; + + pblk_line_setup_metadata(new, l_mg, &pblk->lm); + spin_unlock(&l_mg->free_lock); + +retry_erase: + left_seblks = atomic_read(&new->left_seblks); + if (left_seblks) { + /* If line is not fully erased, erase it */ + if (atomic_read(&new->left_eblks)) { + if (pblk_line_erase(pblk, new)) + goto out; + } else { + io_schedule(); + } + goto retry_erase; + } + + if (pblk_line_alloc_bitmaps(pblk, new)) + return NULL; + +retry_setup: + if (!pblk_line_init_metadata(pblk, new, cur)) { + new = pblk_line_retry(pblk, new); + if (!new) + goto out; + + goto retry_setup; + } + + if (!pblk_line_init_bb(pblk, new, 1)) { + new = pblk_line_retry(pblk, new); + if (!new) + goto out; + + goto retry_setup; + } + + pblk_rl_free_lines_dec(&pblk->rl, new, true); + + /* Allocate next line for preparation */ + spin_lock(&l_mg->free_lock); + l_mg->data_next = pblk_line_get(pblk); + if (!l_mg->data_next) { + /* If we cannot get a new line, we need to stop the pipeline. + * Only allow as many writes in as we can store safely and then + * fail gracefully + */ + pblk_stop_writes(pblk, new); + l_mg->data_next = NULL; + } else { + l_mg->data_next->seq_nr = l_mg->d_seq_nr++; + l_mg->data_next->type = PBLK_LINETYPE_DATA; + } + spin_unlock(&l_mg->free_lock); + +out: + return new; +} + +static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_gc *gc = &pblk->gc; + + spin_lock(&line->lock); + WARN_ON(line->state != PBLK_LINESTATE_GC); + if (line->w_err_gc->has_gc_err) { + spin_unlock(&line->lock); + pblk_err(pblk, "line %d had errors during GC\n", line->id); + pblk_put_line_back(pblk, line); + line->w_err_gc->has_gc_err = 0; + return; + } + + line->state = PBLK_LINESTATE_FREE; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + line->gc_group = PBLK_LINEGC_NONE; + pblk_line_free(line); + + if (line->w_err_gc->has_write_err) { + pblk_rl_werr_line_out(&pblk->rl); + line->w_err_gc->has_write_err = 0; + } + + spin_unlock(&line->lock); + atomic_dec(&gc->pipeline_gc); + + spin_lock(&l_mg->free_lock); + list_add_tail(&line->list, &l_mg->free_list); + l_mg->nr_free_lines++; + spin_unlock(&l_mg->free_lock); + + pblk_rl_free_lines_inc(&pblk->rl, line); +} + +static void pblk_line_put_ws(struct work_struct *work) +{ + struct pblk_line_ws *line_put_ws = container_of(work, + struct pblk_line_ws, ws); + struct pblk *pblk = line_put_ws->pblk; + struct pblk_line *line = line_put_ws->line; + + __pblk_line_put(pblk, line); + mempool_free(line_put_ws, &pblk->gen_ws_pool); +} + +void pblk_line_put(struct kref *ref) +{ + struct pblk_line *line = container_of(ref, struct pblk_line, ref); + struct pblk *pblk = line->pblk; + + __pblk_line_put(pblk, line); +} + +void pblk_line_put_wq(struct kref *ref) +{ + struct pblk_line *line = container_of(ref, struct pblk_line, ref); + struct pblk *pblk = line->pblk; + struct pblk_line_ws *line_put_ws; + + line_put_ws = mempool_alloc(&pblk->gen_ws_pool, GFP_ATOMIC); + if (!line_put_ws) + return; + + line_put_ws->pblk = pblk; + line_put_ws->line = line; + line_put_ws->priv = NULL; + + INIT_WORK(&line_put_ws->ws, pblk_line_put_ws); + queue_work(pblk->r_end_wq, &line_put_ws->ws); +} + +int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa) +{ + struct nvm_rq *rqd; + int err; + + rqd = pblk_alloc_rqd(pblk, PBLK_ERASE); + + pblk_setup_e_rq(pblk, rqd, ppa); + + rqd->end_io = pblk_end_io_erase; + rqd->private = pblk; + + trace_pblk_chunk_reset(pblk_disk_name(pblk), + &ppa, PBLK_CHUNK_RESET_START); + + /* The write thread schedules erases so that it minimizes disturbances + * with writes. Thus, there is no need to take the LUN semaphore. + */ + err = pblk_submit_io(pblk, rqd, NULL); + if (err) { + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + + pblk_err(pblk, "could not async erase line:%d,blk:%d\n", + pblk_ppa_to_line_id(ppa), + pblk_ppa_to_pos(geo, ppa)); + } + + return err; +} + +struct pblk_line *pblk_line_get_data(struct pblk *pblk) +{ + return pblk->l_mg.data_line; +} + +/* For now, always erase next line */ +struct pblk_line *pblk_line_get_erase(struct pblk *pblk) +{ + return pblk->l_mg.data_next; +} + +int pblk_line_is_full(struct pblk_line *line) +{ + return (line->left_msecs == 0); +} + +static void pblk_line_should_sync_meta(struct pblk *pblk) +{ + if (pblk_rl_is_limit(&pblk->rl)) + pblk_line_close_meta_sync(pblk); +} + +void pblk_line_close(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_line_mgmt *l_mg = &pblk->l_mg; + struct list_head *move_list; + int i; + +#ifdef CONFIG_NVM_PBLK_DEBUG + WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line), + "pblk: corrupt closed line %d\n", line->id); +#endif + + spin_lock(&l_mg->free_lock); + WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap)); + spin_unlock(&l_mg->free_lock); + + spin_lock(&l_mg->gc_lock); + spin_lock(&line->lock); + WARN_ON(line->state != PBLK_LINESTATE_OPEN); + line->state = PBLK_LINESTATE_CLOSED; + move_list = pblk_line_gc_list(pblk, line); + list_add_tail(&line->list, move_list); + + mempool_free(line->map_bitmap, l_mg->bitmap_pool); + line->map_bitmap = NULL; + line->smeta = NULL; + line->emeta = NULL; + + for (i = 0; i < lm->blk_per_line; i++) { + struct pblk_lun *rlun = &pblk->luns[i]; + int pos = pblk_ppa_to_pos(geo, rlun->bppa); + int state = line->chks[pos].state; + + if (!(state & NVM_CHK_ST_OFFLINE)) + state = NVM_CHK_ST_CLOSED; + } + + spin_unlock(&line->lock); + spin_unlock(&l_mg->gc_lock); + + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); +} + +void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_emeta *emeta = line->emeta; + struct line_emeta *emeta_buf = emeta->buf; + struct wa_counters *wa = emeta_to_wa(lm, emeta_buf); + + /* No need for exact vsc value; avoid a big line lock and take aprox. */ + memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len); + memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len); + + wa->user = cpu_to_le64(atomic64_read(&pblk->user_wa)); + wa->pad = cpu_to_le64(atomic64_read(&pblk->pad_wa)); + wa->gc = cpu_to_le64(atomic64_read(&pblk->gc_wa)); + + if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) { + emeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC); + guid_copy((guid_t *)&emeta_buf->header.uuid, + &pblk->instance_uuid); + emeta_buf->header.id = cpu_to_le32(line->id); + emeta_buf->header.type = cpu_to_le16(line->type); + emeta_buf->header.version_major = EMETA_VERSION_MAJOR; + emeta_buf->header.version_minor = EMETA_VERSION_MINOR; + emeta_buf->header.crc = cpu_to_le32( + pblk_calc_meta_header_crc(pblk, &emeta_buf->header)); + } + + emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas); + emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf)); + + spin_lock(&l_mg->close_lock); + spin_lock(&line->lock); + + /* Update the in-memory start address for emeta, in case it has + * shifted due to write errors + */ + if (line->emeta_ssec != line->cur_sec) + line->emeta_ssec = line->cur_sec; + + list_add_tail(&line->list, &l_mg->emeta_list); + spin_unlock(&line->lock); + spin_unlock(&l_mg->close_lock); + + pblk_line_should_sync_meta(pblk); +} + +static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + unsigned int lba_list_size = lm->emeta_len[2]; + struct pblk_w_err_gc *w_err_gc = line->w_err_gc; + struct pblk_emeta *emeta = line->emeta; + + w_err_gc->lba_list = kvmalloc(lba_list_size, GFP_KERNEL); + memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf), + lba_list_size); +} + +void pblk_line_close_ws(struct work_struct *work) +{ + struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws, + ws); + struct pblk *pblk = line_ws->pblk; + struct pblk_line *line = line_ws->line; + struct pblk_w_err_gc *w_err_gc = line->w_err_gc; + + /* Write errors makes the emeta start address stored in smeta invalid, + * so keep a copy of the lba list until we've gc'd the line + */ + if (w_err_gc->has_write_err) + pblk_save_lba_list(pblk, line); + + pblk_line_close(pblk, line); + mempool_free(line_ws, &pblk->gen_ws_pool); +} + +void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, + void (*work)(struct work_struct *), gfp_t gfp_mask, + struct workqueue_struct *wq) +{ + struct pblk_line_ws *line_ws; + + line_ws = mempool_alloc(&pblk->gen_ws_pool, gfp_mask); + + line_ws->pblk = pblk; + line_ws->line = line; + line_ws->priv = priv; + + INIT_WORK(&line_ws->ws, work); + queue_work(wq, &line_ws->ws); +} + +static void __pblk_down_chunk(struct pblk *pblk, int pos) +{ + struct pblk_lun *rlun = &pblk->luns[pos]; + int ret; + + /* + * Only send one inflight I/O per LUN. Since we map at a page + * granurality, all ppas in the I/O will map to the same LUN + */ + + ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000)); + if (ret == -ETIME || ret == -EINTR) + pblk_err(pblk, "taking lun semaphore timed out: err %d\n", + -ret); +} + +void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + int pos = pblk_ppa_to_pos(geo, ppa); + + __pblk_down_chunk(pblk, pos); +} + +void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa, + unsigned long *lun_bitmap) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + int pos = pblk_ppa_to_pos(geo, ppa); + + /* If the LUN has been locked for this same request, do no attempt to + * lock it again + */ + if (test_and_set_bit(pos, lun_bitmap)) + return; + + __pblk_down_chunk(pblk, pos); +} + +void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_lun *rlun; + int pos = pblk_ppa_to_pos(geo, ppa); + + rlun = &pblk->luns[pos]; + up(&rlun->wr_sem); +} + +void pblk_up_rq(struct pblk *pblk, unsigned long *lun_bitmap) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_lun *rlun; + int num_lun = geo->all_luns; + int bit = -1; + + while ((bit = find_next_bit(lun_bitmap, num_lun, bit + 1)) < num_lun) { + rlun = &pblk->luns[bit]; + up(&rlun->wr_sem); + } +} + +void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) +{ + struct ppa_addr ppa_l2p; + + /* logic error: lba out-of-bounds. Ignore update */ + if (!(lba < pblk->capacity)) { + WARN(1, "pblk: corrupted L2P map request\n"); + return; + } + + spin_lock(&pblk->trans_lock); + ppa_l2p = pblk_trans_map_get(pblk, lba); + + if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p)) + pblk_map_invalidate(pblk, ppa_l2p); + + pblk_trans_map_set(pblk, lba, ppa); + spin_unlock(&pblk->trans_lock); +} + +void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) +{ + +#ifdef CONFIG_NVM_PBLK_DEBUG + /* Callers must ensure that the ppa points to a cache address */ + BUG_ON(!pblk_addr_in_cache(ppa)); + BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa))); +#endif + + pblk_update_map(pblk, lba, ppa); +} + +int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new, + struct pblk_line *gc_line, u64 paddr_gc) +{ + struct ppa_addr ppa_l2p, ppa_gc; + int ret = 1; + +#ifdef CONFIG_NVM_PBLK_DEBUG + /* Callers must ensure that the ppa points to a cache address */ + BUG_ON(!pblk_addr_in_cache(ppa_new)); + BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new))); +#endif + + /* logic error: lba out-of-bounds. Ignore update */ + if (!(lba < pblk->capacity)) { + WARN(1, "pblk: corrupted L2P map request\n"); + return 0; + } + + spin_lock(&pblk->trans_lock); + ppa_l2p = pblk_trans_map_get(pblk, lba); + ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id); + + if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) { + spin_lock(&gc_line->lock); + WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap), + "pblk: corrupted GC update"); + spin_unlock(&gc_line->lock); + + ret = 0; + goto out; + } + + pblk_trans_map_set(pblk, lba, ppa_new); +out: + spin_unlock(&pblk->trans_lock); + return ret; +} + +void pblk_update_map_dev(struct pblk *pblk, sector_t lba, + struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache) +{ + struct ppa_addr ppa_l2p; + +#ifdef CONFIG_NVM_PBLK_DEBUG + /* Callers must ensure that the ppa points to a device address */ + BUG_ON(pblk_addr_in_cache(ppa_mapped)); +#endif + /* Invalidate and discard padded entries */ + if (lba == ADDR_EMPTY) { + atomic64_inc(&pblk->pad_wa); +#ifdef CONFIG_NVM_PBLK_DEBUG + atomic_long_inc(&pblk->padded_wb); +#endif + if (!pblk_ppa_empty(ppa_mapped)) + pblk_map_invalidate(pblk, ppa_mapped); + return; + } + + /* logic error: lba out-of-bounds. Ignore update */ + if (!(lba < pblk->capacity)) { + WARN(1, "pblk: corrupted L2P map request\n"); + return; + } + + spin_lock(&pblk->trans_lock); + ppa_l2p = pblk_trans_map_get(pblk, lba); + + /* Do not update L2P if the cacheline has been updated. In this case, + * the mapped ppa must be invalidated + */ + if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) { + if (!pblk_ppa_empty(ppa_mapped)) + pblk_map_invalidate(pblk, ppa_mapped); + goto out; + } + +#ifdef CONFIG_NVM_PBLK_DEBUG + WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p)); +#endif + + pblk_trans_map_set(pblk, lba, ppa_mapped); +out: + spin_unlock(&pblk->trans_lock); +} + +int pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas, + sector_t blba, int nr_secs, bool *from_cache) +{ + int i; + + spin_lock(&pblk->trans_lock); + for (i = 0; i < nr_secs; i++) { + struct ppa_addr ppa; + + ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i); + + /* If the L2P entry maps to a line, the reference is valid */ + if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) { + struct pblk_line *line = pblk_ppa_to_line(pblk, ppa); + + if (i > 0 && *from_cache) + break; + *from_cache = false; + + kref_get(&line->ref); + } else { + if (i > 0 && !*from_cache) + break; + *from_cache = true; + } + } + spin_unlock(&pblk->trans_lock); + return i; +} + +void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas, + u64 *lba_list, int nr_secs) +{ + u64 lba; + int i; + + spin_lock(&pblk->trans_lock); + for (i = 0; i < nr_secs; i++) { + lba = lba_list[i]; + if (lba != ADDR_EMPTY) { + /* logic error: lba out-of-bounds. Ignore update */ + if (!(lba < pblk->capacity)) { + WARN(1, "pblk: corrupted L2P map request\n"); + continue; + } + ppas[i] = pblk_trans_map_get(pblk, lba); + } + } + spin_unlock(&pblk->trans_lock); +} + +void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd) +{ + void *buffer; + + if (pblk_is_oob_meta_supported(pblk)) { + /* Just use OOB metadata buffer as always */ + buffer = rqd->meta_list; + } else { + /* We need to reuse last page of request (packed metadata) + * in similar way as traditional oob metadata + */ + buffer = page_to_virt( + rqd->bio->bi_io_vec[rqd->bio->bi_vcnt - 1].bv_page); + } + + return buffer; +} + +void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd) +{ + void *meta_list = rqd->meta_list; + void *page; + int i = 0; + + if (pblk_is_oob_meta_supported(pblk)) + return; + + page = page_to_virt(rqd->bio->bi_io_vec[rqd->bio->bi_vcnt - 1].bv_page); + /* We need to fill oob meta buffer with data from packed metadata */ + for (; i < rqd->nr_ppas; i++) + memcpy(pblk_get_meta(pblk, meta_list, i), + page + (i * sizeof(struct pblk_sec_meta)), + sizeof(struct pblk_sec_meta)); +} |