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- // 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));
- }
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