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linux/drivers/lightnvm/pblk-recovery.c
Kees Cook fad953ce0b treewide: Use array_size() in vzalloc() 
The vzalloc() function has no 2-factor argument form, so multiplication
factors need to be wrapped in array_size(). This patch replaces cases of:

        vzalloc(a * b)

with:
        vzalloc(array_size(a, b))

as well as handling cases of:

        vzalloc(a * b * c)

with:

        vzalloc(array3_size(a, b, c))

This does, however, attempt to ignore constant size factors like:

        vzalloc(4 * 1024)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  vzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  vzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  vzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  vzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
  vzalloc(
-	sizeof(TYPE) * (COUNT_ID)
+	array_size(COUNT_ID, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT_ID
+	array_size(COUNT_ID, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * (COUNT_CONST)
+	array_size(COUNT_CONST, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT_CONST
+	array_size(COUNT_CONST, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT_ID)
+	array_size(COUNT_ID, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT_ID
+	array_size(COUNT_ID, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT_CONST)
+	array_size(COUNT_CONST, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT_CONST
+	array_size(COUNT_CONST, sizeof(THING))
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

  vzalloc(
-	SIZE * COUNT
+	array_size(COUNT, SIZE)
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  vzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  vzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  vzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  vzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  vzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  vzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  vzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  vzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  vzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  vzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  vzalloc(C1 * C2 * C3, ...)
|
  vzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants.
@@
expression E1, E2;
constant C1, C2;
@@

(
  vzalloc(C1 * C2, ...)
|
  vzalloc(
-	E1 * E2
+	array_size(E1, E2)
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

1009 lines
24 KiB
C
Raw Blame History

/*
* 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"
int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf)
{
u32 crc;
crc = pblk_calc_emeta_crc(pblk, emeta_buf);
if (le32_to_cpu(emeta_buf->crc) != crc)
return 1;
if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC)
return 1;
return 0;
}
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 pblk_emeta *emeta = line->emeta;
struct line_emeta *emeta_buf = emeta->buf;
__le64 *lba_list;
u64 data_start, data_end;
u64 nr_valid_lbas, nr_lbas = 0;
u64 i;
lba_list = emeta_to_lbas(pblk, emeta_buf);
if (!lba_list)
return 1;
data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec;
data_end = line->emeta_ssec;
nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas);
for (i = data_start; i < data_end; i++) {
struct ppa_addr ppa;
int pos;
ppa = addr_to_gen_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
le32_add_cpu(line->vsc, -1);
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/%llu)\n",
line->id, 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[0] -
nr_bb * geo->clba;
}
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;
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_g_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->csecs;
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->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;
if (pblk_io_aligned(pblk, rq_ppas))
rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
else
rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
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_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_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_sync(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
return ret;
}
atomic_dec(&pblk->inflight_io);
/* 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 && rqd->error != NVM_RSP_WARN_HIGHECC) {
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 void pblk_recov_complete(struct kref *ref)
{
struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref);
complete(&pad_rq->wait);
}
static void pblk_end_io_recov(struct nvm_rq *rqd)
{
struct pblk_pad_rq *pad_rq = rqd->private;
struct pblk *pblk = pad_rq->pblk;
pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
atomic_dec(&pblk->inflight_io);
kref_put(&pad_rq->ref, pblk_recov_complete);
}
static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
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 pblk_pad_rq *pad_rq;
struct nvm_rq *rqd;
struct bio *bio;
void *data;
dma_addr_t dma_ppa_list, dma_meta_list;
__le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
u64 w_ptr = line->cur_sec;
int left_line_ppas, rq_ppas, rq_len;
int i, j;
int ret = 0;
spin_lock(&line->lock);
left_line_ppas = line->left_msecs;
spin_unlock(&line->lock);
pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL);
if (!pad_rq)
return -ENOMEM;
data = vzalloc(array_size(pblk->max_write_pgs, geo->csecs));
if (!data) {
ret = -ENOMEM;
goto free_rq;
}
pad_rq->pblk = pblk;
init_completion(&pad_rq->wait);
kref_init(&pad_rq->ref);
next_pad_rq:
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
if (rq_ppas < pblk->min_write_pgs) {
pr_err("pblk: corrupted pad line %d\n", line->id);
goto fail_free_pad;
}
rq_len = rq_ppas * geo->csecs;
meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
if (!meta_list) {
ret = -ENOMEM;
goto fail_free_pad;
}
ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
PBLK_VMALLOC_META, GFP_KERNEL);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
goto fail_free_meta;
}
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
rqd->bio = bio;
rqd->opcode = NVM_OP_PWRITE;
rqd->flags = pblk_set_progr_mode(pblk, 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_recov;
rqd->private = pad_rq;
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_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_ppa_to_pos(geo, ppa);
}
for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) {
struct ppa_addr dev_ppa;
__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id);
pblk_map_invalidate(pblk, dev_ppa);
lba_list[w_ptr] = meta_list[i].lba = addr_empty;
rqd->ppa_list[i] = dev_ppa;
}
}
kref_get(&pad_rq->ref);
pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas);
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
goto fail_free_bio;
}
left_line_ppas -= rq_ppas;
left_ppas -= rq_ppas;
if (left_ppas && left_line_ppas)
goto next_pad_rq;
kref_put(&pad_rq->ref, pblk_recov_complete);
if (!wait_for_completion_io_timeout(&pad_rq->wait,
msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
pr_err("pblk: pad write timed out\n");
ret = -ETIME;
}
if (!pblk_line_is_full(line))
pr_err("pblk: corrupted padded line: %d\n", line->id);
vfree(data);
free_rq:
kfree(pad_rq);
return ret;
fail_free_bio:
bio_put(bio);
fail_free_meta:
nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
fail_free_pad:
kfree(pad_rq);
vfree(data);
return ret;
}
/* 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;
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_g_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->csecs;
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->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;
if (pblk_io_aligned(pblk, rq_ppas))
rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
else
rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
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_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_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_sync(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
return ret;
}
atomic_dec(&pblk->inflight_io);
/* 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, 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);
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);
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_g_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->csecs;
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->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;
if (pblk_io_aligned(pblk, rq_ppas))
rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
else
rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
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_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_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_sync(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
bio_put(bio);
return ret;
}
atomic_dec(&pblk->inflight_io);
/* 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;
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;
meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
if (!meta_list)
return -ENOMEM;
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->csecs, GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto free_meta_list;
}
rqd = pblk_alloc_rqd(pblk, PBLK_READ);
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);
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);
}
static u64 pblk_line_emeta_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;
unsigned int emeta_secs;
u64 emeta_start;
struct ppa_addr ppa;
int pos;
emeta_secs = lm->emeta_sec[0];
emeta_start = lm->sec_per_line;
while (emeta_secs) {
emeta_start--;
ppa = addr_to_gen_ppa(pblk, emeta_start, line->id);
pos = pblk_ppa_to_pos(geo, ppa);
if (!test_bit(pos, line->blk_bitmap))
emeta_secs--;
}
return emeta_start;
}
static int pblk_recov_check_line_version(struct pblk *pblk,
struct line_emeta *emeta)
{
struct line_header *header = &emeta->header;
if (header->version_major != EMETA_VERSION_MAJOR) {
pr_err("pblk: line major version mismatch: %d, expected: %d\n",
header->version_major, EMETA_VERSION_MAJOR);
return 1;
}
#ifdef NVM_DEBUG
if (header->version_minor > EMETA_VERSION_MINOR)
pr_info("pblk: newer line minor version found: %d\n", line_v);
#endif
return 0;
}
static void pblk_recov_wa_counters(struct pblk *pblk,
struct line_emeta *emeta)
{
struct pblk_line_meta *lm = &pblk->lm;
struct line_header *header = &emeta->header;
struct wa_counters *wa = emeta_to_wa(lm, emeta);
/* WA counters were introduced in emeta version 0.2 */
if (header->version_major > 0 || header->version_minor >= 2) {
u64 user = le64_to_cpu(wa->user);
u64 pad = le64_to_cpu(wa->pad);
u64 gc = le64_to_cpu(wa->gc);
atomic64_set(&pblk->user_wa, user);
atomic64_set(&pblk->pad_wa, pad);
atomic64_set(&pblk->gc_wa, gc);
pblk->user_rst_wa = user;
pblk->pad_rst_wa = pad;
pblk->gc_rst_wa = gc;
}
}
static int pblk_line_was_written(struct pblk_line *line,
struct pblk *pblk)
{
struct pblk_line_meta *lm = &pblk->lm;
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct nvm_chk_meta *chunk;
struct ppa_addr bppa;
int smeta_blk;
if (line->state == PBLK_LINESTATE_BAD)
return 0;
smeta_blk = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
if (smeta_blk >= lm->blk_per_line)
return 0;
bppa = pblk->luns[smeta_blk].bppa;
chunk = &line->chks[pblk_ppa_to_pos(geo, bppa)];
if (chunk->state & NVM_CHK_ST_FREE)
return 0;
return 1;
}
struct pblk_line *pblk_recov_l2p(struct pblk *pblk)
{
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 pblk_smeta *smeta;
struct pblk_emeta *emeta;
struct line_smeta *smeta_buf;
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];
emeta = l_mg->eline_meta[meta_line];
smeta_buf = (struct line_smeta *)smeta;
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_buf)) +
sizeof(struct line_smeta);
if (!pblk_line_was_written(line, pblk))
continue;
/* 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_buf);
if (le32_to_cpu(smeta_buf->crc) != crc)
continue;
if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC)
continue;
if (smeta_buf->header.version_major != SMETA_VERSION_MAJOR) {
pr_err("pblk: found incompatible line version %u\n",
smeta_buf->header.version_major);
return ERR_PTR(-EINVAL);
}
/* The first valid instance uuid is used for initialization */
if (!valid_uuid) {
memcpy(pblk->instance_uuid, smeta_buf->header.uuid, 16);
valid_uuid = 1;
}
if (memcmp(pblk->instance_uuid, smeta_buf->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(smeta_buf->header.id);
line->type = le16_to_cpu(smeta_buf->header.type);
line->seq_nr = le64_to_cpu(smeta_buf->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_buf->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) {
recovered_lines++;
line->emeta_ssec = pblk_line_emeta_start(pblk, line);
line->emeta = emeta;
memset(line->emeta->buf, 0, lm->emeta_len[0]);
if (pblk_line_read_emeta(pblk, line, line->emeta->buf)) {
pblk_recov_l2p_from_oob(pblk, line);
goto next;
}
if (pblk_recov_check_emeta(pblk, line->emeta->buf)) {
pblk_recov_l2p_from_oob(pblk, line);
goto next;
}
if (pblk_recov_check_line_version(pblk, line->emeta->buf))
return ERR_PTR(-EINVAL);
pblk_recov_wa_counters(pblk, line->emeta->buf);
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);
kfree(line->map_bitmap);
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);
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 current line
*/
int pblk_recov_pad(struct pblk *pblk)
{
struct pblk_line *line;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
int left_msecs;
int ret = 0;
spin_lock(&l_mg->free_lock);
line = l_mg->data_line;
left_msecs = line->left_msecs;
spin_unlock(&l_mg->free_lock);
ret = pblk_recov_pad_oob(pblk, line, left_msecs);
if (ret) {
pr_err("pblk: Tear down padding failed (%d)\n", ret);
return ret;
}
pblk_line_close_meta(pblk, line);
return ret;
}
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