linux/drivers/lightnvm/pblk-recovery.c
Dan Carpenter 2a79efd833 lightnvm: fix some WARN() messages
WARN_ON() takes a condition, not an error message.  I slightly tweaked
some conditions so hopefully it's more clear.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-16 10:06:34 -06:00

999 lines
24 KiB
C

/*
* Copyright (C) 2016 CNEX Labs
* Initial: Javier Gonzalez <javier@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-recovery.c - pblk's recovery path
*/
#include "pblk.h"
void pblk_submit_rec(struct work_struct *work)
{
struct pblk_rec_ctx *recovery =
container_of(work, struct pblk_rec_ctx, ws_rec);
struct pblk *pblk = recovery->pblk;
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_rq *rqd = recovery->rqd;
struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
int max_secs = nvm_max_phys_sects(dev);
struct bio *bio;
unsigned int nr_rec_secs;
unsigned int pgs_read;
int ret;
nr_rec_secs = bitmap_weight((unsigned long int *)&rqd->ppa_status,
max_secs);
bio = bio_alloc(GFP_KERNEL, nr_rec_secs);
if (!bio) {
pr_err("pblk: not able to create recovery bio\n");
return;
}
bio->bi_iter.bi_sector = 0;
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
rqd->bio = bio;
rqd->nr_ppas = nr_rec_secs;
pgs_read = pblk_rb_read_to_bio_list(&pblk->rwb, bio, &recovery->failed,
nr_rec_secs);
if (pgs_read != nr_rec_secs) {
pr_err("pblk: could not read recovery entries\n");
goto err;
}
if (pblk_setup_w_rec_rq(pblk, rqd, c_ctx)) {
pr_err("pblk: could not setup recovery request\n");
goto err;
}
#ifdef CONFIG_NVM_DEBUG
atomic_long_add(nr_rec_secs, &pblk->recov_writes);
#endif
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
goto err;
}
mempool_free(recovery, pblk->rec_pool);
return;
err:
bio_put(bio);
pblk_free_rqd(pblk, rqd, WRITE);
}
int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx,
struct pblk_rec_ctx *recovery, u64 *comp_bits,
unsigned int comp)
{
struct nvm_tgt_dev *dev = pblk->dev;
int max_secs = nvm_max_phys_sects(dev);
struct nvm_rq *rec_rqd;
struct pblk_c_ctx *rec_ctx;
int nr_entries = c_ctx->nr_valid + c_ctx->nr_padded;
rec_rqd = pblk_alloc_rqd(pblk, WRITE);
if (IS_ERR(rec_rqd)) {
pr_err("pblk: could not create recovery req.\n");
return -ENOMEM;
}
rec_ctx = nvm_rq_to_pdu(rec_rqd);
/* Copy completion bitmap, but exclude the first X completed entries */
bitmap_shift_right((unsigned long int *)&rec_rqd->ppa_status,
(unsigned long int *)comp_bits,
comp, max_secs);
/* Save the context for the entries that need to be re-written and
* update current context with the completed entries.
*/
rec_ctx->sentry = pblk_rb_wrap_pos(&pblk->rwb, c_ctx->sentry + comp);
if (comp >= c_ctx->nr_valid) {
rec_ctx->nr_valid = 0;
rec_ctx->nr_padded = nr_entries - comp;
c_ctx->nr_padded = comp - c_ctx->nr_valid;
} else {
rec_ctx->nr_valid = c_ctx->nr_valid - comp;
rec_ctx->nr_padded = c_ctx->nr_padded;
c_ctx->nr_valid = comp;
c_ctx->nr_padded = 0;
}
recovery->rqd = rec_rqd;
recovery->pblk = pblk;
return 0;
}
__le64 *pblk_recov_get_lba_list(struct pblk *pblk, struct line_emeta *emeta)
{
u32 crc;
crc = pblk_calc_emeta_crc(pblk, emeta);
if (le32_to_cpu(emeta->crc) != crc)
return NULL;
if (le32_to_cpu(emeta->header.identifier) != PBLK_MAGIC)
return NULL;
return pblk_line_emeta_to_lbas(emeta);
}
static int pblk_recov_l2p_from_emeta(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 line_emeta *emeta = line->emeta;
__le64 *lba_list;
int data_start;
int nr_data_lbas, nr_valid_lbas, nr_lbas = 0;
int i;
lba_list = pblk_recov_get_lba_list(pblk, emeta);
if (!lba_list)
return 1;
data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec;
nr_data_lbas = lm->sec_per_line - lm->emeta_sec;
nr_valid_lbas = le64_to_cpu(emeta->nr_valid_lbas);
for (i = data_start; i < nr_data_lbas && nr_lbas < nr_valid_lbas; i++) {
struct ppa_addr ppa;
int pos;
ppa = addr_to_pblk_ppa(pblk, i, line->id);
pos = pblk_ppa_to_pos(geo, ppa);
/* Do not update bad blocks */
if (test_bit(pos, line->blk_bitmap))
continue;
if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) {
spin_lock(&line->lock);
if (test_and_set_bit(i, line->invalid_bitmap))
WARN_ONCE(1, "pblk: rec. double invalidate:\n");
else
line->vsc--;
spin_unlock(&line->lock);
continue;
}
pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa);
nr_lbas++;
}
if (nr_valid_lbas != nr_lbas)
pr_err("pblk: line %d - inconsistent lba list(%llu/%d)\n",
line->id, line->emeta->nr_valid_lbas, nr_lbas);
line->left_msecs = 0;
return 0;
}
static int pblk_calc_sec_in_line(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 nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line);
return lm->sec_per_line - lm->smeta_sec - lm->emeta_sec -
nr_bb * geo->sec_per_blk;
}
struct pblk_recov_alloc {
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
struct nvm_rq *rqd;
void *data;
dma_addr_t dma_ppa_list;
dma_addr_t dma_meta_list;
};
static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line,
struct pblk_recov_alloc p, u64 r_ptr)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
struct nvm_rq *rqd;
struct bio *bio;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
u64 r_ptr_int;
int left_ppas;
int rq_ppas, rq_len;
int i, j;
int ret = 0;
DECLARE_COMPLETION_ONSTACK(wait);
ppa_list = p.ppa_list;
meta_list = p.meta_list;
rqd = p.rqd;
data = p.data;
dma_ppa_list = p.dma_ppa_list;
dma_meta_list = p.dma_meta_list;
left_ppas = line->cur_sec - r_ptr;
if (!left_ppas)
return 0;
r_ptr_int = r_ptr;
next_read_rq:
memset(rqd, 0, pblk_r_rq_size);
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
if (!rq_ppas)
rq_ppas = pblk->min_write_pgs;
rq_len = rq_ppas * geo->sec_size;
bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
if (IS_ERR(bio))
return PTR_ERR(bio);
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_READ, 0);
rqd->bio = bio;
rqd->opcode = NVM_OP_PREAD;
rqd->flags = pblk_set_read_mode(pblk);
rqd->meta_list = meta_list;
rqd->nr_ppas = rq_ppas;
rqd->ppa_list = ppa_list;
rqd->dma_ppa_list = dma_ppa_list;
rqd->dma_meta_list = dma_meta_list;
rqd->end_io = pblk_end_io_sync;
rqd->private = &wait;
for (i = 0; i < rqd->nr_ppas; ) {
struct ppa_addr ppa;
int pos;
ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
pos = pblk_dev_ppa_to_pos(geo, ppa);
while (test_bit(pos, line->blk_bitmap)) {
r_ptr_int += pblk->min_write_pgs;
ppa = addr_to_gen_ppa(pblk, r_ptr_int, line->id);
pos = pblk_dev_ppa_to_pos(geo, ppa);
}
for (j = 0; j < pblk->min_write_pgs; j++, i++, r_ptr_int++)
rqd->ppa_list[i] =
addr_to_gen_ppa(pblk, r_ptr_int, line->id);
}
/* If read fails, more padding is needed */
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
return ret;
}
if (!wait_for_completion_io_timeout(&wait,
msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
pr_err("pblk: L2P recovery read timed out\n");
return -EINTR;
}
reinit_completion(&wait);
/* At this point, the read should not fail. If it does, it is a problem
* we cannot recover from here. Need FTL log.
*/
if (rqd->error) {
pr_err("pblk: L2P recovery failed (%d)\n", rqd->error);
return -EINTR;
}
for (i = 0; i < rqd->nr_ppas; i++) {
u64 lba = le64_to_cpu(meta_list[i].lba);
if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
continue;
pblk_update_map(pblk, lba, rqd->ppa_list[i]);
}
left_ppas -= rq_ppas;
if (left_ppas > 0)
goto next_read_rq;
return 0;
}
static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
struct pblk_recov_alloc p, int left_ppas)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
struct nvm_rq *rqd;
struct bio *bio;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
__le64 *lba_list = pblk_line_emeta_to_lbas(line->emeta);
u64 w_ptr = line->cur_sec;
int left_line_ppas = line->left_msecs;
int rq_ppas, rq_len;
int i, j;
int ret = 0;
DECLARE_COMPLETION_ONSTACK(wait);
ppa_list = p.ppa_list;
meta_list = p.meta_list;
rqd = p.rqd;
data = p.data;
dma_ppa_list = p.dma_ppa_list;
dma_meta_list = p.dma_meta_list;
next_pad_rq:
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
if (!rq_ppas)
rq_ppas = pblk->min_write_pgs;
rq_len = rq_ppas * geo->sec_size;
bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
if (IS_ERR(bio))
return PTR_ERR(bio);
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
memset(rqd, 0, pblk_r_rq_size);
rqd->bio = bio;
rqd->opcode = NVM_OP_PWRITE;
rqd->flags = pblk_set_progr_mode(pblk, WRITE);
rqd->meta_list = meta_list;
rqd->nr_ppas = rq_ppas;
rqd->ppa_list = ppa_list;
rqd->dma_ppa_list = dma_ppa_list;
rqd->dma_meta_list = dma_meta_list;
rqd->end_io = pblk_end_io_sync;
rqd->private = &wait;
for (i = 0; i < rqd->nr_ppas; ) {
struct ppa_addr ppa;
int pos;
w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
ppa = addr_to_pblk_ppa(pblk, w_ptr, line->id);
pos = pblk_ppa_to_pos(geo, ppa);
while (test_bit(pos, line->blk_bitmap)) {
w_ptr += pblk->min_write_pgs;
ppa = addr_to_pblk_ppa(pblk, w_ptr, line->id);
pos = pblk_ppa_to_pos(geo, ppa);
}
for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) {
struct ppa_addr dev_ppa;
dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
pblk_map_invalidate(pblk, dev_ppa);
meta_list[i].lba = cpu_to_le64(ADDR_EMPTY);
lba_list[w_ptr] = cpu_to_le64(ADDR_EMPTY);
rqd->ppa_list[i] = dev_ppa;
}
}
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
return ret;
}
if (!wait_for_completion_io_timeout(&wait,
msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
pr_err("pblk: L2P recovery write timed out\n");
}
reinit_completion(&wait);
left_line_ppas -= rq_ppas;
left_ppas -= rq_ppas;
if (left_ppas > 0 && left_line_ppas)
goto next_pad_rq;
return 0;
}
/* When this function is called, it means that not all upper pages have been
* written in a page that contains valid data. In order to recover this data, we
* first find the write pointer on the device, then we pad all necessary
* sectors, and finally attempt to read the valid data
*/
static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
struct pblk_recov_alloc p)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
struct nvm_rq *rqd;
struct bio *bio;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
u64 w_ptr = 0, r_ptr;
int rq_ppas, rq_len;
int i, j;
int ret = 0;
int rec_round;
int left_ppas = pblk_calc_sec_in_line(pblk, line) - line->cur_sec;
DECLARE_COMPLETION_ONSTACK(wait);
ppa_list = p.ppa_list;
meta_list = p.meta_list;
rqd = p.rqd;
data = p.data;
dma_ppa_list = p.dma_ppa_list;
dma_meta_list = p.dma_meta_list;
/* we could recover up until the line write pointer */
r_ptr = line->cur_sec;
rec_round = 0;
next_rq:
memset(rqd, 0, pblk_r_rq_size);
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
if (!rq_ppas)
rq_ppas = pblk->min_write_pgs;
rq_len = rq_ppas * geo->sec_size;
bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
if (IS_ERR(bio))
return PTR_ERR(bio);
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_READ, 0);
rqd->bio = bio;
rqd->opcode = NVM_OP_PREAD;
rqd->flags = pblk_set_read_mode(pblk);
rqd->meta_list = meta_list;
rqd->nr_ppas = rq_ppas;
rqd->ppa_list = ppa_list;
rqd->dma_ppa_list = dma_ppa_list;
rqd->dma_meta_list = dma_meta_list;
rqd->end_io = pblk_end_io_sync;
rqd->private = &wait;
for (i = 0; i < rqd->nr_ppas; ) {
struct ppa_addr ppa;
int pos;
w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
pos = pblk_dev_ppa_to_pos(geo, ppa);
while (test_bit(pos, line->blk_bitmap)) {
w_ptr += pblk->min_write_pgs;
ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
pos = pblk_dev_ppa_to_pos(geo, ppa);
}
for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++)
rqd->ppa_list[i] =
addr_to_gen_ppa(pblk, w_ptr, line->id);
}
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
return ret;
}
if (!wait_for_completion_io_timeout(&wait,
msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
pr_err("pblk: L2P recovery read timed out\n");
}
reinit_completion(&wait);
/* This should not happen since the read failed during normal recovery,
* but the media works funny sometimes...
*/
if (!rec_round++ && !rqd->error) {
rec_round = 0;
for (i = 0; i < rqd->nr_ppas; i++, r_ptr++) {
u64 lba = le64_to_cpu(meta_list[i].lba);
if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
continue;
pblk_update_map(pblk, lba, rqd->ppa_list[i]);
}
}
/* Reached the end of the written line */
if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
int pad_secs, nr_error_bits, bit;
int ret;
bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas);
nr_error_bits = rqd->nr_ppas - bit;
/* Roll back failed sectors */
line->cur_sec -= nr_error_bits;
line->left_msecs += nr_error_bits;
bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
pad_secs = pblk_pad_distance(pblk);
if (pad_secs > line->left_msecs)
pad_secs = line->left_msecs;
ret = pblk_recov_pad_oob(pblk, line, p, pad_secs);
if (ret)
pr_err("pblk: OOB padding failed (err:%d)\n", ret);
ret = pblk_recov_read_oob(pblk, line, p, r_ptr);
if (ret)
pr_err("pblk: OOB read failed (err:%d)\n", ret);
line->left_ssecs = line->left_msecs;
left_ppas = 0;
}
left_ppas -= rq_ppas;
if (left_ppas > 0)
goto next_rq;
return ret;
}
static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
struct pblk_recov_alloc p, int *done)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
struct nvm_rq *rqd;
struct bio *bio;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
u64 paddr;
int rq_ppas, rq_len;
int i, j;
int ret = 0;
int left_ppas = pblk_calc_sec_in_line(pblk, line);
DECLARE_COMPLETION_ONSTACK(wait);
ppa_list = p.ppa_list;
meta_list = p.meta_list;
rqd = p.rqd;
data = p.data;
dma_ppa_list = p.dma_ppa_list;
dma_meta_list = p.dma_meta_list;
*done = 1;
next_rq:
memset(rqd, 0, pblk_r_rq_size);
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
if (!rq_ppas)
rq_ppas = pblk->min_write_pgs;
rq_len = rq_ppas * geo->sec_size;
bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
if (IS_ERR(bio))
return PTR_ERR(bio);
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_READ, 0);
rqd->bio = bio;
rqd->opcode = NVM_OP_PREAD;
rqd->flags = pblk_set_read_mode(pblk);
rqd->meta_list = meta_list;
rqd->nr_ppas = rq_ppas;
rqd->ppa_list = ppa_list;
rqd->dma_ppa_list = dma_ppa_list;
rqd->dma_meta_list = dma_meta_list;
rqd->end_io = pblk_end_io_sync;
rqd->private = &wait;
for (i = 0; i < rqd->nr_ppas; ) {
struct ppa_addr ppa;
int pos;
paddr = pblk_alloc_page(pblk, line, pblk->min_write_pgs);
ppa = addr_to_gen_ppa(pblk, paddr, line->id);
pos = pblk_dev_ppa_to_pos(geo, ppa);
while (test_bit(pos, line->blk_bitmap)) {
paddr += pblk->min_write_pgs;
ppa = addr_to_gen_ppa(pblk, paddr, line->id);
pos = pblk_dev_ppa_to_pos(geo, ppa);
}
for (j = 0; j < pblk->min_write_pgs; j++, i++, paddr++)
rqd->ppa_list[i] =
addr_to_gen_ppa(pblk, paddr, line->id);
}
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
bio_put(bio);
return ret;
}
if (!wait_for_completion_io_timeout(&wait,
msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
pr_err("pblk: L2P recovery read timed out\n");
}
reinit_completion(&wait);
/* Reached the end of the written line */
if (rqd->error) {
int nr_error_bits, bit;
bit = find_first_bit((void *)&rqd->ppa_status, rqd->nr_ppas);
nr_error_bits = rqd->nr_ppas - bit;
/* Roll back failed sectors */
line->cur_sec -= nr_error_bits;
line->left_msecs += nr_error_bits;
line->left_ssecs = line->left_msecs;
bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
left_ppas = 0;
rqd->nr_ppas = bit;
if (rqd->error != NVM_RSP_ERR_EMPTYPAGE)
*done = 0;
}
for (i = 0; i < rqd->nr_ppas; i++) {
u64 lba = le64_to_cpu(meta_list[i].lba);
if (lba == ADDR_EMPTY || lba > pblk->rl.nr_secs)
continue;
pblk_update_map(pblk, lba, rqd->ppa_list[i]);
}
left_ppas -= rq_ppas;
if (left_ppas > 0)
goto next_rq;
return ret;
}
/* Scan line for lbas on out of bound area */
static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct nvm_rq *rqd;
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
struct pblk_recov_alloc p;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
int done, ret = 0;
rqd = pblk_alloc_rqd(pblk, READ);
if (IS_ERR(rqd))
return PTR_ERR(rqd);
meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
if (!meta_list) {
ret = -ENOMEM;
goto free_rqd;
}
ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
data = kcalloc(pblk->max_write_pgs, geo->sec_size, GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto free_meta_list;
}
p.ppa_list = ppa_list;
p.meta_list = meta_list;
p.rqd = rqd;
p.data = data;
p.dma_ppa_list = dma_ppa_list;
p.dma_meta_list = dma_meta_list;
ret = pblk_recov_scan_oob(pblk, line, p, &done);
if (ret) {
pr_err("pblk: could not recover L2P from OOB\n");
goto out;
}
if (!done) {
ret = pblk_recov_scan_all_oob(pblk, line, p);
if (ret) {
pr_err("pblk: could not recover L2P from OOB\n");
goto out;
}
}
if (pblk_line_is_full(line))
pblk_line_recov_close(pblk, line);
out:
kfree(data);
free_meta_list:
nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
free_rqd:
pblk_free_rqd(pblk, rqd, READ);
return ret;
}
/* Insert lines ordered by sequence number (seq_num) on list */
static void pblk_recov_line_add_ordered(struct list_head *head,
struct pblk_line *line)
{
struct pblk_line *t = NULL;
list_for_each_entry(t, head, list)
if (t->seq_nr > line->seq_nr)
break;
__list_add(&line->list, t->list.prev, &t->list);
}
struct pblk_line *pblk_recov_l2p(struct pblk *pblk)
{
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_line *line, *tline, *data_line = NULL;
struct line_smeta *smeta;
struct line_emeta *emeta;
int found_lines = 0, recovered_lines = 0, open_lines = 0;
int is_next = 0;
int meta_line;
int i, valid_uuid = 0;
LIST_HEAD(recov_list);
/* TODO: Implement FTL snapshot */
/* Scan recovery - takes place when FTL snapshot fails */
spin_lock(&l_mg->free_lock);
meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
set_bit(meta_line, &l_mg->meta_bitmap);
smeta = l_mg->sline_meta[meta_line].meta;
emeta = l_mg->eline_meta[meta_line].meta;
spin_unlock(&l_mg->free_lock);
/* Order data lines using their sequence number */
for (i = 0; i < l_mg->nr_lines; i++) {
u32 crc;
line = &pblk->lines[i];
memset(smeta, 0, lm->smeta_len);
line->smeta = smeta;
line->lun_bitmap = ((void *)(smeta)) +
sizeof(struct line_smeta);
/* Lines that cannot be read are assumed as not written here */
if (pblk_line_read_smeta(pblk, line))
continue;
crc = pblk_calc_smeta_crc(pblk, smeta);
if (le32_to_cpu(smeta->crc) != crc)
continue;
if (le32_to_cpu(smeta->header.identifier) != PBLK_MAGIC)
continue;
if (le16_to_cpu(smeta->header.version) != 1) {
pr_err("pblk: found incompatible line version %u\n",
smeta->header.version);
return ERR_PTR(-EINVAL);
}
/* The first valid instance uuid is used for initialization */
if (!valid_uuid) {
memcpy(pblk->instance_uuid, smeta->header.uuid, 16);
valid_uuid = 1;
}
if (memcmp(pblk->instance_uuid, smeta->header.uuid, 16)) {
pr_debug("pblk: ignore line %u due to uuid mismatch\n",
i);
continue;
}
/* Update line metadata */
spin_lock(&line->lock);
line->id = le32_to_cpu(line->smeta->header.id);
line->type = le16_to_cpu(line->smeta->header.type);
line->seq_nr = le64_to_cpu(line->smeta->seq_nr);
spin_unlock(&line->lock);
/* Update general metadata */
spin_lock(&l_mg->free_lock);
if (line->seq_nr >= l_mg->d_seq_nr)
l_mg->d_seq_nr = line->seq_nr + 1;
l_mg->nr_free_lines--;
spin_unlock(&l_mg->free_lock);
if (pblk_line_recov_alloc(pblk, line))
goto out;
pblk_recov_line_add_ordered(&recov_list, line);
found_lines++;
pr_debug("pblk: recovering data line %d, seq:%llu\n",
line->id, smeta->seq_nr);
}
if (!found_lines) {
pblk_setup_uuid(pblk);
spin_lock(&l_mg->free_lock);
WARN_ON_ONCE(!test_and_clear_bit(meta_line,
&l_mg->meta_bitmap));
spin_unlock(&l_mg->free_lock);
goto out;
}
/* Verify closed blocks and recover this portion of L2P table*/
list_for_each_entry_safe(line, tline, &recov_list, list) {
int off, nr_bb;
recovered_lines++;
/* Calculate where emeta starts based on the line bb */
off = lm->sec_per_line - lm->emeta_sec;
nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line);
off -= nr_bb * geo->sec_per_pl;
memset(emeta, 0, lm->emeta_len);
line->emeta = emeta;
line->emeta_ssec = off;
if (pblk_line_read_emeta(pblk, line)) {
pblk_recov_l2p_from_oob(pblk, line);
goto next;
}
if (pblk_recov_l2p_from_emeta(pblk, line))
pblk_recov_l2p_from_oob(pblk, line);
next:
if (pblk_line_is_full(line)) {
struct list_head *move_list;
spin_lock(&line->lock);
line->state = PBLK_LINESTATE_CLOSED;
move_list = pblk_line_gc_list(pblk, line);
spin_unlock(&line->lock);
spin_lock(&l_mg->gc_lock);
list_move_tail(&line->list, move_list);
spin_unlock(&l_mg->gc_lock);
mempool_free(line->map_bitmap, pblk->line_meta_pool);
line->map_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
} else {
if (open_lines > 1)
pr_err("pblk: failed to recover L2P\n");
open_lines++;
line->meta_line = meta_line;
data_line = line;
}
}
spin_lock(&l_mg->free_lock);
if (!open_lines) {
WARN_ON_ONCE(!test_and_clear_bit(meta_line,
&l_mg->meta_bitmap));
pblk_line_replace_data(pblk);
} else {
/* Allocate next line for preparation */
l_mg->data_next = pblk_line_get(pblk);
if (l_mg->data_next) {
l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
l_mg->data_next->type = PBLK_LINETYPE_DATA;
is_next = 1;
}
}
spin_unlock(&l_mg->free_lock);
if (is_next) {
pblk_line_erase(pblk, l_mg->data_next);
pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next);
}
out:
if (found_lines != recovered_lines)
pr_err("pblk: failed to recover all found lines %d/%d\n",
found_lines, recovered_lines);
return data_line;
}
/*
* Pad until smeta can be read on current data line
*/
void pblk_recov_pad(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_line *line;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct nvm_rq *rqd;
struct pblk_recov_alloc p;
struct ppa_addr *ppa_list;
struct pblk_sec_meta *meta_list;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
spin_lock(&l_mg->free_lock);
line = l_mg->data_line;
spin_unlock(&l_mg->free_lock);
rqd = pblk_alloc_rqd(pblk, READ);
if (IS_ERR(rqd))
return;
meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
if (!meta_list)
goto free_rqd;
ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
data = kcalloc(pblk->max_write_pgs, geo->sec_size, GFP_KERNEL);
if (!data)
goto free_meta_list;
p.ppa_list = ppa_list;
p.meta_list = meta_list;
p.rqd = rqd;
p.data = data;
p.dma_ppa_list = dma_ppa_list;
p.dma_meta_list = dma_meta_list;
if (pblk_recov_pad_oob(pblk, line, p, line->left_msecs)) {
pr_err("pblk: Tear down padding failed\n");
goto free_data;
}
pblk_line_close(pblk, line);
free_data:
kfree(data);
free_meta_list:
nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
free_rqd:
pblk_free_rqd(pblk, rqd, READ);
}