cregit-Linux how code gets into the kernel

Release 4.14 drivers/lightnvm/pblk-map.c

Directory: drivers/lightnvm
/*
 * 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 void pblk_map_page_data(struct pblk *pblk, unsigned int sentry, struct ppa_addr *ppa_list, unsigned long *lun_bitmap, struct pblk_sec_meta *meta_list, unsigned int valid_secs) { struct pblk_line *line = pblk_line_get_data(pblk); struct pblk_emeta *emeta = line->emeta; struct pblk_w_ctx *w_ctx; __le64 *lba_list = emeta_to_lbas(pblk, emeta->buf); u64 paddr; int nr_secs = pblk->min_write_pgs; int i; paddr = pblk_alloc_page(pblk, line, nr_secs); for (i = 0; i < nr_secs; i++, paddr++) { /* 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); w_ctx = pblk_rb_w_ctx(&pblk->rwb, sentry + i); w_ctx->ppa = ppa_list[i]; meta_list[i].lba = cpu_to_le64(w_ctx->lba); lba_list[paddr] = cpu_to_le64(w_ctx->lba); line->nr_valid_lbas++; } else { __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); lba_list[paddr] = meta_list[i].lba = addr_empty; __pblk_map_invalidate(pblk, line, paddr); } } if (pblk_line_is_full(line)) { struct pblk_line *prev_line = line; pblk_line_replace_data(pblk); pblk_line_close_meta(pblk, prev_line); } pblk_down_rq(pblk, ppa_list, nr_secs, lun_bitmap); }

Contributors

PersonTokensPropCommitsCommitProp
Javier González274100.00%5100.00%
Total274100.00%5100.00%


void pblk_map_rq(struct pblk *pblk, struct nvm_rq *rqd, unsigned int sentry, unsigned long *lun_bitmap, unsigned int valid_secs, unsigned int off) { struct pblk_sec_meta *meta_list = rqd->meta_list; unsigned int map_secs; int min = pblk->min_write_pgs; int i; for (i = off; i < rqd->nr_ppas; i += min) { map_secs = (i + min > valid_secs) ? (valid_secs % min) : min; pblk_map_page_data(pblk, sentry + i, &rqd->ppa_list[i], lun_bitmap, &meta_list[i], map_secs); } }

Contributors

PersonTokensPropCommitsCommitProp
Javier González118100.00%1100.00%
Total118100.00%1100.00%

/* only if erase_ppa is set, acquire erase semaphore */
void 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; struct pblk_sec_meta *meta_list = rqd->meta_list; struct pblk_line *e_line, *d_line; unsigned int map_secs; int min = pblk->min_write_pgs; int i, erase_lun; for (i = 0; i < rqd->nr_ppas; i += min) { map_secs = (i + min > valid_secs) ? (valid_secs % min) : min; pblk_map_page_data(pblk, sentry + i, &rqd->ppa_list[i], lun_bitmap, &meta_list[i], map_secs); erase_lun = pblk_ppa_to_pos(geo, rqd->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 = rqd->ppa_list[i]; erase_ppa->g.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; /* Erase blocks that are bad in this line but might not be in next */ if (unlikely(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; 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->g.blk = e_line->id; } }

Contributors

PersonTokensPropCommitsCommitProp
Javier González457100.00%5100.00%
Total457100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Javier González854100.00%8100.00%
Total854100.00%8100.00%
Directory: drivers/lightnvm
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