| // 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-map.c - pblk's lba-ppa mapping strategy |
| * |
| */ |
| |
| #include "pblk.h" |
| |
| static int pblk_map_page_data(struct pblk *pblk, unsigned int sentry, |
| struct ppa_addr *ppa_list, |
| unsigned long *lun_bitmap, |
| void *meta_list, |
| unsigned int valid_secs) |
| { |
| struct pblk_line *line = pblk_line_get_data(pblk); |
| struct pblk_emeta *emeta; |
| struct pblk_w_ctx *w_ctx; |
| __le64 *lba_list; |
| u64 paddr; |
| int nr_secs = pblk->min_write_pgs; |
| int i; |
| |
| if (!line) |
| return -ENOSPC; |
| |
| if (pblk_line_is_full(line)) { |
| struct pblk_line *prev_line = line; |
| |
| /* If we cannot allocate a new line, make sure to store metadata |
| * on current line and then fail |
| */ |
| line = pblk_line_replace_data(pblk); |
| pblk_line_close_meta(pblk, prev_line); |
| |
| if (!line) { |
| pblk_pipeline_stop(pblk); |
| return -ENOSPC; |
| } |
| |
| } |
| |
| emeta = line->emeta; |
| lba_list = emeta_to_lbas(pblk, emeta->buf); |
| |
| paddr = pblk_alloc_page(pblk, line, nr_secs); |
| |
| for (i = 0; i < nr_secs; i++, paddr++) { |
| struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); |
| __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); |
| |
| /* ppa to be sent to the device */ |
| ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id); |
| |
| /* Write context for target bio completion on write buffer. Note |
| * that the write buffer is protected by the sync backpointer, |
| * and a single writer thread have access to each specific entry |
| * at a time. Thus, it is safe to modify the context for the |
| * entry we are setting up for submission without taking any |
| * lock or memory barrier. |
| */ |
| if (i < valid_secs) { |
| kref_get(&line->ref); |
| atomic_inc(&line->sec_to_update); |
| w_ctx = pblk_rb_w_ctx(&pblk->rwb, sentry + i); |
| w_ctx->ppa = ppa_list[i]; |
| meta->lba = cpu_to_le64(w_ctx->lba); |
| lba_list[paddr] = cpu_to_le64(w_ctx->lba); |
| if (lba_list[paddr] != addr_empty) |
| line->nr_valid_lbas++; |
| else |
| atomic64_inc(&pblk->pad_wa); |
| } else { |
| lba_list[paddr] = addr_empty; |
| meta->lba = addr_empty; |
| __pblk_map_invalidate(pblk, line, paddr); |
| } |
| } |
| |
| pblk_down_rq(pblk, ppa_list[0], lun_bitmap); |
| return 0; |
| } |
| |
| int pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry, |
| unsigned long *lun_bitmap, unsigned int valid_secs, |
| unsigned int off) |
| { |
| void *meta_list = pblk_get_meta_for_writes(pblk, rqd); |
| void *meta_buffer; |
| struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
| unsigned int map_secs; |
| int min = pblk->min_write_pgs; |
| int i; |
| int ret; |
| |
| for (i = off; i < rqd->nr_ppas; i += min) { |
| map_secs = (i + min > valid_secs) ? (valid_secs % min) : min; |
| meta_buffer = pblk_get_meta(pblk, meta_list, i); |
| |
| ret = pblk_map_page_data(pblk, sentry + i, &ppa_list[i], |
| lun_bitmap, meta_buffer, map_secs); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* only if erase_ppa is set, acquire erase semaphore */ |
| int pblk_map_erase_rq(struct pblk *pblk, struct nvm_rq *rqd, |
| unsigned int sentry, unsigned long *lun_bitmap, |
| unsigned int valid_secs, struct ppa_addr *erase_ppa) |
| { |
| struct nvm_tgt_dev *dev = pblk->dev; |
| struct nvm_geo *geo = &dev->geo; |
| struct pblk_line_meta *lm = &pblk->lm; |
| void *meta_list = pblk_get_meta_for_writes(pblk, rqd); |
| void *meta_buffer; |
| struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
| struct pblk_line *e_line, *d_line; |
| unsigned int map_secs; |
| int min = pblk->min_write_pgs; |
| int i, erase_lun; |
| int ret; |
| |
| |
| for (i = 0; i < rqd->nr_ppas; i += min) { |
| map_secs = (i + min > valid_secs) ? (valid_secs % min) : min; |
| meta_buffer = pblk_get_meta(pblk, meta_list, i); |
| |
| ret = pblk_map_page_data(pblk, sentry + i, &ppa_list[i], |
| lun_bitmap, meta_buffer, map_secs); |
| if (ret) |
| return ret; |
| |
| erase_lun = pblk_ppa_to_pos(geo, ppa_list[i]); |
| |
| /* line can change after page map. We might also be writing the |
| * last line. |
| */ |
| e_line = pblk_line_get_erase(pblk); |
| if (!e_line) |
| return pblk_map_rq(pblk, rqd, sentry, lun_bitmap, |
| valid_secs, i + min); |
| |
| spin_lock(&e_line->lock); |
| if (!test_bit(erase_lun, e_line->erase_bitmap)) { |
| set_bit(erase_lun, e_line->erase_bitmap); |
| atomic_dec(&e_line->left_eblks); |
| |
| *erase_ppa = ppa_list[i]; |
| erase_ppa->a.blk = e_line->id; |
| |
| spin_unlock(&e_line->lock); |
| |
| /* Avoid evaluating e_line->left_eblks */ |
| return pblk_map_rq(pblk, rqd, sentry, lun_bitmap, |
| valid_secs, i + min); |
| } |
| spin_unlock(&e_line->lock); |
| } |
| |
| d_line = pblk_line_get_data(pblk); |
| |
| /* line can change after page map. We might also be writing the |
| * last line. |
| */ |
| e_line = pblk_line_get_erase(pblk); |
| if (!e_line) |
| return -ENOSPC; |
| |
| /* Erase blocks that are bad in this line but might not be in next */ |
| if (unlikely(pblk_ppa_empty(*erase_ppa)) && |
| bitmap_weight(d_line->blk_bitmap, lm->blk_per_line)) { |
| int bit = -1; |
| |
| retry: |
| bit = find_next_bit(d_line->blk_bitmap, |
| lm->blk_per_line, bit + 1); |
| if (bit >= lm->blk_per_line) |
| return 0; |
| |
| spin_lock(&e_line->lock); |
| if (test_bit(bit, e_line->erase_bitmap)) { |
| spin_unlock(&e_line->lock); |
| goto retry; |
| } |
| spin_unlock(&e_line->lock); |
| |
| set_bit(bit, e_line->erase_bitmap); |
| atomic_dec(&e_line->left_eblks); |
| *erase_ppa = pblk->luns[bit].bppa; /* set ch and lun */ |
| erase_ppa->a.blk = e_line->id; |
| } |
| |
| return 0; |
| } |