linux/drivers/lightnvm/pblk-map.c
Igor Konopko 55d8ec3539 lightnvm: pblk: support packed metadata
pblk performs recovery of open lines by storing the LBA in the per LBA
metadata field. Recovery therefore only works for drives that has this
field.

This patch adds support for packed metadata, which store l2p mapping
for open lines in last sector of every write unit and enables drives
without per IO metadata to recover open lines.

After this patch, drives with OOB size <16B will use packed metadata
and metadata size larger than16B will continue to use the device per
IO metadata.

Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-11 12:22:35 -07:00

209 lines
5.6 KiB
C

// 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);
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;
}