swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
Tip revision: 8f3d9f354286745c751374f5f1fcafee6b3f3136 authored by Linus Torvalds on 12 April 2020, 19:35:55 UTC
Linux 5.7-rc1
Linux 5.7-rc1
Tip revision: 8f3d9f3
pblk-core.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-core.c - pblk's core functionality
*
*/
#define CREATE_TRACE_POINTS
#include "pblk.h"
#include "pblk-trace.h"
static void pblk_line_mark_bb(struct work_struct *work)
{
struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
ws);
struct pblk *pblk = line_ws->pblk;
struct nvm_tgt_dev *dev = pblk->dev;
struct ppa_addr *ppa = line_ws->priv;
int ret;
ret = nvm_set_chunk_meta(dev, ppa, 1, NVM_BLK_T_GRWN_BAD);
if (ret) {
struct pblk_line *line;
int pos;
line = pblk_ppa_to_line(pblk, *ppa);
pos = pblk_ppa_to_pos(&dev->geo, *ppa);
pblk_err(pblk, "failed to mark bb, line:%d, pos:%d\n",
line->id, pos);
}
kfree(ppa);
mempool_free(line_ws, &pblk->gen_ws_pool);
}
static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
struct ppa_addr ppa_addr)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct ppa_addr *ppa;
int pos = pblk_ppa_to_pos(geo, ppa_addr);
pblk_debug(pblk, "erase failed: line:%d, pos:%d\n", line->id, pos);
atomic_long_inc(&pblk->erase_failed);
atomic_dec(&line->blk_in_line);
if (test_and_set_bit(pos, line->blk_bitmap))
pblk_err(pblk, "attempted to erase bb: line:%d, pos:%d\n",
line->id, pos);
/* Not necessary to mark bad blocks on 2.0 spec. */
if (geo->version == NVM_OCSSD_SPEC_20)
return;
ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
if (!ppa)
return;
*ppa = ppa_addr;
pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb,
GFP_ATOMIC, pblk->bb_wq);
}
static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct nvm_chk_meta *chunk;
struct pblk_line *line;
int pos;
line = pblk_ppa_to_line(pblk, rqd->ppa_addr);
pos = pblk_ppa_to_pos(geo, rqd->ppa_addr);
chunk = &line->chks[pos];
atomic_dec(&line->left_seblks);
if (rqd->error) {
trace_pblk_chunk_reset(pblk_disk_name(pblk),
&rqd->ppa_addr, PBLK_CHUNK_RESET_FAILED);
chunk->state = NVM_CHK_ST_OFFLINE;
pblk_mark_bb(pblk, line, rqd->ppa_addr);
} else {
trace_pblk_chunk_reset(pblk_disk_name(pblk),
&rqd->ppa_addr, PBLK_CHUNK_RESET_DONE);
chunk->state = NVM_CHK_ST_FREE;
}
trace_pblk_chunk_state(pblk_disk_name(pblk), &rqd->ppa_addr,
chunk->state);
atomic_dec(&pblk->inflight_io);
}
/* Erase completion assumes that only one block is erased at the time */
static void pblk_end_io_erase(struct nvm_rq *rqd)
{
struct pblk *pblk = rqd->private;
__pblk_end_io_erase(pblk, rqd);
mempool_free(rqd, &pblk->e_rq_pool);
}
/*
* Get information for all chunks from the device.
*
* The caller is responsible for freeing (vmalloc) the returned structure
*/
struct nvm_chk_meta *pblk_get_chunk_meta(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct nvm_chk_meta *meta;
struct ppa_addr ppa;
unsigned long len;
int ret;
ppa.ppa = 0;
len = geo->all_chunks * sizeof(*meta);
meta = vzalloc(len);
if (!meta)
return ERR_PTR(-ENOMEM);
ret = nvm_get_chunk_meta(dev, ppa, geo->all_chunks, meta);
if (ret) {
vfree(meta);
return ERR_PTR(-EIO);
}
return meta;
}
struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
struct nvm_chk_meta *meta,
struct ppa_addr ppa)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int ch_off = ppa.m.grp * geo->num_chk * geo->num_lun;
int lun_off = ppa.m.pu * geo->num_chk;
int chk_off = ppa.m.chk;
return meta + ch_off + lun_off + chk_off;
}
void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
u64 paddr)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct list_head *move_list = NULL;
/* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P
* table is modified with reclaimed sectors, a check is done to endure
* that newer updates are not overwritten.
*/
spin_lock(&line->lock);
WARN_ON(line->state == PBLK_LINESTATE_FREE);
if (test_and_set_bit(paddr, line->invalid_bitmap)) {
WARN_ONCE(1, "pblk: double invalidate\n");
spin_unlock(&line->lock);
return;
}
le32_add_cpu(line->vsc, -1);
if (line->state == PBLK_LINESTATE_CLOSED)
move_list = pblk_line_gc_list(pblk, line);
spin_unlock(&line->lock);
if (move_list) {
spin_lock(&l_mg->gc_lock);
spin_lock(&line->lock);
/* Prevent moving a line that has just been chosen for GC */
if (line->state == PBLK_LINESTATE_GC) {
spin_unlock(&line->lock);
spin_unlock(&l_mg->gc_lock);
return;
}
spin_unlock(&line->lock);
list_move_tail(&line->list, move_list);
spin_unlock(&l_mg->gc_lock);
}
}
void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
{
struct pblk_line *line;
u64 paddr;
#ifdef CONFIG_NVM_PBLK_DEBUG
/* Callers must ensure that the ppa points to a device address */
BUG_ON(pblk_addr_in_cache(ppa));
BUG_ON(pblk_ppa_empty(ppa));
#endif
line = pblk_ppa_to_line(pblk, ppa);
paddr = pblk_dev_ppa_to_line_addr(pblk, ppa);
__pblk_map_invalidate(pblk, line, paddr);
}
static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
unsigned int nr_secs)
{
sector_t lba;
spin_lock(&pblk->trans_lock);
for (lba = slba; lba < slba + nr_secs; lba++) {
struct ppa_addr ppa;
ppa = pblk_trans_map_get(pblk, lba);
if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa))
pblk_map_invalidate(pblk, ppa);
pblk_ppa_set_empty(&ppa);
pblk_trans_map_set(pblk, lba, ppa);
}
spin_unlock(&pblk->trans_lock);
}
int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd)
{
struct nvm_tgt_dev *dev = pblk->dev;
rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
&rqd->dma_meta_list);
if (!rqd->meta_list)
return -ENOMEM;
if (rqd->nr_ppas == 1)
return 0;
rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size(pblk);
rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size(pblk);
return 0;
}
void pblk_free_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd)
{
struct nvm_tgt_dev *dev = pblk->dev;
if (rqd->meta_list)
nvm_dev_dma_free(dev->parent, rqd->meta_list,
rqd->dma_meta_list);
}
/* Caller must guarantee that the request is a valid type */
struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type)
{
mempool_t *pool;
struct nvm_rq *rqd;
int rq_size;
switch (type) {
case PBLK_WRITE:
case PBLK_WRITE_INT:
pool = &pblk->w_rq_pool;
rq_size = pblk_w_rq_size;
break;
case PBLK_READ:
pool = &pblk->r_rq_pool;
rq_size = pblk_g_rq_size;
break;
default:
pool = &pblk->e_rq_pool;
rq_size = pblk_g_rq_size;
}
rqd = mempool_alloc(pool, GFP_KERNEL);
memset(rqd, 0, rq_size);
return rqd;
}
/* Typically used on completion path. Cannot guarantee request consistency */
void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
{
mempool_t *pool;
switch (type) {
case PBLK_WRITE:
kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap);
/* fall through */
case PBLK_WRITE_INT:
pool = &pblk->w_rq_pool;
break;
case PBLK_READ:
pool = &pblk->r_rq_pool;
break;
case PBLK_ERASE:
pool = &pblk->e_rq_pool;
break;
default:
pblk_err(pblk, "trying to free unknown rqd type\n");
return;
}
pblk_free_rqd_meta(pblk, rqd);
mempool_free(rqd, pool);
}
void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
int nr_pages)
{
struct bio_vec *bv;
struct page *page;
int i, e, nbv = 0;
for (i = 0; i < bio->bi_vcnt; i++) {
bv = &bio->bi_io_vec[i];
page = bv->bv_page;
for (e = 0; e < bv->bv_len; e += PBLK_EXPOSED_PAGE_SIZE, nbv++)
if (nbv >= off)
mempool_free(page++, &pblk->page_bio_pool);
}
}
int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
int nr_pages)
{
struct request_queue *q = pblk->dev->q;
struct page *page;
int i, ret;
for (i = 0; i < nr_pages; i++) {
page = mempool_alloc(&pblk->page_bio_pool, flags);
ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
if (ret != PBLK_EXPOSED_PAGE_SIZE) {
pblk_err(pblk, "could not add page to bio\n");
mempool_free(page, &pblk->page_bio_pool);
goto err;
}
}
return 0;
err:
pblk_bio_free_pages(pblk, bio, (bio->bi_vcnt - i), i);
return -1;
}
void pblk_write_kick(struct pblk *pblk)
{
wake_up_process(pblk->writer_ts);
mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000));
}
void pblk_write_timer_fn(struct timer_list *t)
{
struct pblk *pblk = from_timer(pblk, t, wtimer);
/* kick the write thread every tick to flush outstanding data */
pblk_write_kick(pblk);
}
void pblk_write_should_kick(struct pblk *pblk)
{
unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb);
if (secs_avail >= pblk->min_write_pgs_data)
pblk_write_kick(pblk);
}
static void pblk_wait_for_meta(struct pblk *pblk)
{
do {
if (!atomic_read(&pblk->inflight_io))
break;
schedule();
} while (1);
}
static void pblk_flush_writer(struct pblk *pblk)
{
pblk_rb_flush(&pblk->rwb);
do {
if (!pblk_rb_sync_count(&pblk->rwb))
break;
pblk_write_kick(pblk);
schedule();
} while (1);
}
struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct list_head *move_list = NULL;
int packed_meta = (le32_to_cpu(*line->vsc) / pblk->min_write_pgs_data)
* (pblk->min_write_pgs - pblk->min_write_pgs_data);
int vsc = le32_to_cpu(*line->vsc) + packed_meta;
lockdep_assert_held(&line->lock);
if (line->w_err_gc->has_write_err) {
if (line->gc_group != PBLK_LINEGC_WERR) {
line->gc_group = PBLK_LINEGC_WERR;
move_list = &l_mg->gc_werr_list;
pblk_rl_werr_line_in(&pblk->rl);
}
} else if (!vsc) {
if (line->gc_group != PBLK_LINEGC_FULL) {
line->gc_group = PBLK_LINEGC_FULL;
move_list = &l_mg->gc_full_list;
}
} else if (vsc < lm->high_thrs) {
if (line->gc_group != PBLK_LINEGC_HIGH) {
line->gc_group = PBLK_LINEGC_HIGH;
move_list = &l_mg->gc_high_list;
}
} else if (vsc < lm->mid_thrs) {
if (line->gc_group != PBLK_LINEGC_MID) {
line->gc_group = PBLK_LINEGC_MID;
move_list = &l_mg->gc_mid_list;
}
} else if (vsc < line->sec_in_line) {
if (line->gc_group != PBLK_LINEGC_LOW) {
line->gc_group = PBLK_LINEGC_LOW;
move_list = &l_mg->gc_low_list;
}
} else if (vsc == line->sec_in_line) {
if (line->gc_group != PBLK_LINEGC_EMPTY) {
line->gc_group = PBLK_LINEGC_EMPTY;
move_list = &l_mg->gc_empty_list;
}
} else {
line->state = PBLK_LINESTATE_CORRUPT;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
line->gc_group = PBLK_LINEGC_NONE;
move_list = &l_mg->corrupt_list;
pblk_err(pblk, "corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n",
line->id, vsc,
line->sec_in_line,
lm->high_thrs, lm->mid_thrs);
}
return move_list;
}
void pblk_discard(struct pblk *pblk, struct bio *bio)
{
sector_t slba = pblk_get_lba(bio);
sector_t nr_secs = pblk_get_secs(bio);
pblk_invalidate_range(pblk, slba, nr_secs);
}
void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd)
{
atomic_long_inc(&pblk->write_failed);
#ifdef CONFIG_NVM_PBLK_DEBUG
pblk_print_failed_rqd(pblk, rqd, rqd->error);
#endif
}
void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
{
/* Empty page read is not necessarily an error (e.g., L2P recovery) */
if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
atomic_long_inc(&pblk->read_empty);
return;
}
switch (rqd->error) {
case NVM_RSP_WARN_HIGHECC:
atomic_long_inc(&pblk->read_high_ecc);
break;
case NVM_RSP_ERR_FAILECC:
case NVM_RSP_ERR_FAILCRC:
atomic_long_inc(&pblk->read_failed);
break;
default:
pblk_err(pblk, "unknown read error:%d\n", rqd->error);
}
#ifdef CONFIG_NVM_PBLK_DEBUG
pblk_print_failed_rqd(pblk, rqd, rqd->error);
#endif
}
void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
{
pblk->sec_per_write = sec_per_write;
}
int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd, void *buf)
{
struct nvm_tgt_dev *dev = pblk->dev;
atomic_inc(&pblk->inflight_io);
#ifdef CONFIG_NVM_PBLK_DEBUG
if (pblk_check_io(pblk, rqd))
return NVM_IO_ERR;
#endif
return nvm_submit_io(dev, rqd, buf);
}
void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd)
{
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
int i;
for (i = 0; i < rqd->nr_ppas; i++) {
struct ppa_addr *ppa = &ppa_list[i];
struct nvm_chk_meta *chunk = pblk_dev_ppa_to_chunk(pblk, *ppa);
u64 caddr = pblk_dev_ppa_to_chunk_addr(pblk, *ppa);
if (caddr == 0)
trace_pblk_chunk_state(pblk_disk_name(pblk),
ppa, NVM_CHK_ST_OPEN);
else if (caddr == (chunk->cnlb - 1))
trace_pblk_chunk_state(pblk_disk_name(pblk),
ppa, NVM_CHK_ST_CLOSED);
}
}
int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd, void *buf)
{
struct nvm_tgt_dev *dev = pblk->dev;
int ret;
atomic_inc(&pblk->inflight_io);
#ifdef CONFIG_NVM_PBLK_DEBUG
if (pblk_check_io(pblk, rqd))
return NVM_IO_ERR;
#endif
ret = nvm_submit_io_sync(dev, rqd, buf);
if (trace_pblk_chunk_state_enabled() && !ret &&
rqd->opcode == NVM_OP_PWRITE)
pblk_check_chunk_state_update(pblk, rqd);
return ret;
}
static int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd,
void *buf)
{
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
int ret;
pblk_down_chunk(pblk, ppa_list[0]);
ret = pblk_submit_io_sync(pblk, rqd, buf);
pblk_up_chunk(pblk, ppa_list[0]);
return ret;
}
int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
unsigned long secs_to_flush, bool skip_meta)
{
int max = pblk->sec_per_write;
int min = pblk->min_write_pgs;
int secs_to_sync = 0;
if (skip_meta && pblk->min_write_pgs_data != pblk->min_write_pgs)
min = max = pblk->min_write_pgs_data;
if (secs_avail >= max)
secs_to_sync = max;
else if (secs_avail >= min)
secs_to_sync = min * (secs_avail / min);
else if (secs_to_flush)
secs_to_sync = min;
return secs_to_sync;
}
void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
{
u64 addr;
int i;
spin_lock(&line->lock);
addr = find_next_zero_bit(line->map_bitmap,
pblk->lm.sec_per_line, line->cur_sec);
line->cur_sec = addr - nr_secs;
for (i = 0; i < nr_secs; i++, line->cur_sec--)
WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
spin_unlock(&line->lock);
}
u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
{
u64 addr;
int i;
lockdep_assert_held(&line->lock);
/* logic error: ppa out-of-bounds. Prevent generating bad address */
if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) {
WARN(1, "pblk: page allocation out of bounds\n");
nr_secs = pblk->lm.sec_per_line - line->cur_sec;
}
line->cur_sec = addr = find_next_zero_bit(line->map_bitmap,
pblk->lm.sec_per_line, line->cur_sec);
for (i = 0; i < nr_secs; i++, line->cur_sec++)
WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap));
return addr;
}
u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
{
u64 addr;
/* Lock needed in case a write fails and a recovery needs to remap
* failed write buffer entries
*/
spin_lock(&line->lock);
addr = __pblk_alloc_page(pblk, line, nr_secs);
line->left_msecs -= nr_secs;
WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n");
spin_unlock(&line->lock);
return addr;
}
u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line)
{
u64 paddr;
spin_lock(&line->lock);
paddr = find_next_zero_bit(line->map_bitmap,
pblk->lm.sec_per_line, line->cur_sec);
spin_unlock(&line->lock);
return paddr;
}
u64 pblk_line_smeta_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;
int bit;
/* This usually only happens on bad lines */
bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
if (bit >= lm->blk_per_line)
return -1;
return bit * geo->ws_opt;
}
int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
struct ppa_addr *ppa_list;
struct nvm_rq rqd;
u64 paddr = pblk_line_smeta_start(pblk, line);
int i, ret;
memset(&rqd, 0, sizeof(struct nvm_rq));
ret = pblk_alloc_rqd_meta(pblk, &rqd);
if (ret)
return ret;
rqd.opcode = NVM_OP_PREAD;
rqd.nr_ppas = lm->smeta_sec;
rqd.is_seq = 1;
ppa_list = nvm_rq_to_ppa_list(&rqd);
for (i = 0; i < lm->smeta_sec; i++, paddr++)
ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
ret = pblk_submit_io_sync(pblk, &rqd, line->smeta);
if (ret) {
pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
goto clear_rqd;
}
atomic_dec(&pblk->inflight_io);
if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) {
pblk_log_read_err(pblk, &rqd);
ret = -EIO;
}
clear_rqd:
pblk_free_rqd_meta(pblk, &rqd);
return ret;
}
static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line,
u64 paddr)
{
struct pblk_line_meta *lm = &pblk->lm;
struct ppa_addr *ppa_list;
struct nvm_rq rqd;
__le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
int i, ret;
memset(&rqd, 0, sizeof(struct nvm_rq));
ret = pblk_alloc_rqd_meta(pblk, &rqd);
if (ret)
return ret;
rqd.opcode = NVM_OP_PWRITE;
rqd.nr_ppas = lm->smeta_sec;
rqd.is_seq = 1;
ppa_list = nvm_rq_to_ppa_list(&rqd);
for (i = 0; i < lm->smeta_sec; i++, paddr++) {
struct pblk_sec_meta *meta = pblk_get_meta(pblk,
rqd.meta_list, i);
ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
meta->lba = lba_list[paddr] = addr_empty;
}
ret = pblk_submit_io_sync_sem(pblk, &rqd, line->smeta);
if (ret) {
pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
goto clear_rqd;
}
atomic_dec(&pblk->inflight_io);
if (rqd.error) {
pblk_log_write_err(pblk, &rqd);
ret = -EIO;
}
clear_rqd:
pblk_free_rqd_meta(pblk, &rqd);
return ret;
}
int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
void *emeta_buf)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_line_meta *lm = &pblk->lm;
void *ppa_list_buf, *meta_list;
struct ppa_addr *ppa_list;
struct nvm_rq rqd;
u64 paddr = line->emeta_ssec;
dma_addr_t dma_ppa_list, dma_meta_list;
int min = pblk->min_write_pgs;
int left_ppas = lm->emeta_sec[0];
int line_id = line->id;
int rq_ppas, rq_len;
int i, j;
int ret;
meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
&dma_meta_list);
if (!meta_list)
return -ENOMEM;
ppa_list_buf = meta_list + pblk_dma_meta_size(pblk);
dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk);
next_rq:
memset(&rqd, 0, sizeof(struct nvm_rq));
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false);
rq_len = rq_ppas * geo->csecs;
rqd.meta_list = meta_list;
rqd.ppa_list = ppa_list_buf;
rqd.dma_meta_list = dma_meta_list;
rqd.dma_ppa_list = dma_ppa_list;
rqd.opcode = NVM_OP_PREAD;
rqd.nr_ppas = rq_ppas;
ppa_list = nvm_rq_to_ppa_list(&rqd);
for (i = 0; i < rqd.nr_ppas; ) {
struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, line_id);
int pos = pblk_ppa_to_pos(geo, ppa);
if (pblk_io_aligned(pblk, rq_ppas))
rqd.is_seq = 1;
while (test_bit(pos, line->blk_bitmap)) {
paddr += min;
if (pblk_boundary_paddr_checks(pblk, paddr)) {
ret = -EINTR;
goto free_rqd_dma;
}
ppa = addr_to_gen_ppa(pblk, paddr, line_id);
pos = pblk_ppa_to_pos(geo, ppa);
}
if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
ret = -EINTR;
goto free_rqd_dma;
}
for (j = 0; j < min; j++, i++, paddr++)
ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line_id);
}
ret = pblk_submit_io_sync(pblk, &rqd, emeta_buf);
if (ret) {
pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
goto free_rqd_dma;
}
atomic_dec(&pblk->inflight_io);
if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) {
pblk_log_read_err(pblk, &rqd);
ret = -EIO;
goto free_rqd_dma;
}
emeta_buf += rq_len;
left_ppas -= rq_ppas;
if (left_ppas)
goto next_rq;
free_rqd_dma:
nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
return ret;
}
static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd,
struct ppa_addr ppa)
{
rqd->opcode = NVM_OP_ERASE;
rqd->ppa_addr = ppa;
rqd->nr_ppas = 1;
rqd->is_seq = 1;
rqd->bio = NULL;
}
static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
{
struct nvm_rq rqd = {NULL};
int ret;
trace_pblk_chunk_reset(pblk_disk_name(pblk), &ppa,
PBLK_CHUNK_RESET_START);
pblk_setup_e_rq(pblk, &rqd, ppa);
/* The write thread schedules erases so that it minimizes disturbances
* with writes. Thus, there is no need to take the LUN semaphore.
*/
ret = pblk_submit_io_sync(pblk, &rqd, NULL);
rqd.private = pblk;
__pblk_end_io_erase(pblk, &rqd);
return ret;
}
int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
struct ppa_addr ppa;
int ret, bit = -1;
/* Erase only good blocks, one at a time */
do {
spin_lock(&line->lock);
bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line,
bit + 1);
if (bit >= lm->blk_per_line) {
spin_unlock(&line->lock);
break;
}
ppa = pblk->luns[bit].bppa; /* set ch and lun */
ppa.a.blk = line->id;
atomic_dec(&line->left_eblks);
WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
spin_unlock(&line->lock);
ret = pblk_blk_erase_sync(pblk, ppa);
if (ret) {
pblk_err(pblk, "failed to erase line %d\n", line->id);
return ret;
}
} while (1);
return 0;
}
static void pblk_line_setup_metadata(struct pblk_line *line,
struct pblk_line_mgmt *l_mg,
struct pblk_line_meta *lm)
{
int meta_line;
lockdep_assert_held(&l_mg->free_lock);
retry_meta:
meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
if (meta_line == PBLK_DATA_LINES) {
spin_unlock(&l_mg->free_lock);
io_schedule();
spin_lock(&l_mg->free_lock);
goto retry_meta;
}
set_bit(meta_line, &l_mg->meta_bitmap);
line->meta_line = meta_line;
line->smeta = l_mg->sline_meta[meta_line];
line->emeta = l_mg->eline_meta[meta_line];
memset(line->smeta, 0, lm->smeta_len);
memset(line->emeta->buf, 0, lm->emeta_len[0]);
line->emeta->mem = 0;
atomic_set(&line->emeta->sync, 0);
}
/* For now lines are always assumed full lines. Thus, smeta former and current
* lun bitmaps are omitted.
*/
static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
struct pblk_line *cur)
{
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_emeta *emeta = line->emeta;
struct line_emeta *emeta_buf = emeta->buf;
struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
int nr_blk_line;
/* After erasing the line, new bad blocks might appear and we risk
* having an invalid line
*/
nr_blk_line = lm->blk_per_line -
bitmap_weight(line->blk_bitmap, lm->blk_per_line);
if (nr_blk_line < lm->min_blk_line) {
spin_lock(&l_mg->free_lock);
spin_lock(&line->lock);
line->state = PBLK_LINESTATE_BAD;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
spin_unlock(&line->lock);
list_add_tail(&line->list, &l_mg->bad_list);
spin_unlock(&l_mg->free_lock);
pblk_debug(pblk, "line %d is bad\n", line->id);
return 0;
}
/* Run-time metadata */
line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
/* Mark LUNs allocated in this line (all for now) */
bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len);
smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
guid_copy((guid_t *)&smeta_buf->header.uuid, &pblk->instance_uuid);
smeta_buf->header.id = cpu_to_le32(line->id);
smeta_buf->header.type = cpu_to_le16(line->type);
smeta_buf->header.version_major = SMETA_VERSION_MAJOR;
smeta_buf->header.version_minor = SMETA_VERSION_MINOR;
/* Start metadata */
smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
smeta_buf->window_wr_lun = cpu_to_le32(geo->all_luns);
/* Fill metadata among lines */
if (cur) {
memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
smeta_buf->prev_id = cpu_to_le32(cur->id);
cur->emeta->buf->next_id = cpu_to_le32(line->id);
} else {
smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
}
/* All smeta must be set at this point */
smeta_buf->header.crc = cpu_to_le32(
pblk_calc_meta_header_crc(pblk, &smeta_buf->header));
smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf));
/* End metadata */
memcpy(&emeta_buf->header, &smeta_buf->header,
sizeof(struct line_header));
emeta_buf->header.version_major = EMETA_VERSION_MAJOR;
emeta_buf->header.version_minor = EMETA_VERSION_MINOR;
emeta_buf->header.crc = cpu_to_le32(
pblk_calc_meta_header_crc(pblk, &emeta_buf->header));
emeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line);
emeta_buf->nr_valid_lbas = cpu_to_le64(0);
emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY);
emeta_buf->crc = cpu_to_le32(0);
emeta_buf->prev_id = smeta_buf->prev_id;
return 1;
}
static int pblk_line_alloc_bitmaps(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
line->map_bitmap = mempool_alloc(l_mg->bitmap_pool, GFP_KERNEL);
if (!line->map_bitmap)
return -ENOMEM;
memset(line->map_bitmap, 0, lm->sec_bitmap_len);
/* will be initialized using bb info from map_bitmap */
line->invalid_bitmap = mempool_alloc(l_mg->bitmap_pool, GFP_KERNEL);
if (!line->invalid_bitmap) {
mempool_free(line->map_bitmap, l_mg->bitmap_pool);
line->map_bitmap = NULL;
return -ENOMEM;
}
return 0;
}
/* For now lines are always assumed full lines. Thus, smeta former and current
* lun bitmaps are omitted.
*/
static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
int init)
{
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;
u64 off;
int bit = -1;
int emeta_secs;
line->sec_in_line = lm->sec_per_line;
/* Capture bad block information on line mapping bitmaps */
while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line,
bit + 1)) < lm->blk_per_line) {
off = bit * geo->ws_opt;
bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off,
lm->sec_per_line);
bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux,
lm->sec_per_line);
line->sec_in_line -= geo->clba;
}
/* Mark smeta metadata sectors as bad sectors */
bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
off = bit * geo->ws_opt;
bitmap_set(line->map_bitmap, off, lm->smeta_sec);
line->sec_in_line -= lm->smeta_sec;
line->cur_sec = off + lm->smeta_sec;
if (init && pblk_line_smeta_write(pblk, line, off)) {
pblk_debug(pblk, "line smeta I/O failed. Retry\n");
return 0;
}
bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line);
/* Mark emeta metadata sectors as bad sectors. We need to consider bad
* blocks to make sure that there are enough sectors to store emeta
*/
emeta_secs = lm->emeta_sec[0];
off = lm->sec_per_line;
while (emeta_secs) {
off -= geo->ws_opt;
if (!test_bit(off, line->invalid_bitmap)) {
bitmap_set(line->invalid_bitmap, off, geo->ws_opt);
emeta_secs -= geo->ws_opt;
}
}
line->emeta_ssec = off;
line->sec_in_line -= lm->emeta_sec[0];
line->nr_valid_lbas = 0;
line->left_msecs = line->sec_in_line;
*line->vsc = cpu_to_le32(line->sec_in_line);
if (lm->sec_per_line - line->sec_in_line !=
bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) {
spin_lock(&line->lock);
line->state = PBLK_LINESTATE_BAD;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
spin_unlock(&line->lock);
list_add_tail(&line->list, &l_mg->bad_list);
pblk_err(pblk, "unexpected line %d is bad\n", line->id);
return 0;
}
return 1;
}
static int pblk_prepare_new_line(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int blk_to_erase = atomic_read(&line->blk_in_line);
int i;
for (i = 0; i < lm->blk_per_line; i++) {
struct pblk_lun *rlun = &pblk->luns[i];
int pos = pblk_ppa_to_pos(geo, rlun->bppa);
int state = line->chks[pos].state;
/* Free chunks should not be erased */
if (state & NVM_CHK_ST_FREE) {
set_bit(pblk_ppa_to_pos(geo, rlun->bppa),
line->erase_bitmap);
blk_to_erase--;
}
}
return blk_to_erase;
}
static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
int blk_in_line = atomic_read(&line->blk_in_line);
int blk_to_erase;
/* Bad blocks do not need to be erased */
bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
spin_lock(&line->lock);
/* If we have not written to this line, we need to mark up free chunks
* as already erased
*/
if (line->state == PBLK_LINESTATE_NEW) {
blk_to_erase = pblk_prepare_new_line(pblk, line);
line->state = PBLK_LINESTATE_FREE;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
} else {
blk_to_erase = blk_in_line;
}
if (blk_in_line < lm->min_blk_line) {
spin_unlock(&line->lock);
return -EAGAIN;
}
if (line->state != PBLK_LINESTATE_FREE) {
WARN(1, "pblk: corrupted line %d, state %d\n",
line->id, line->state);
spin_unlock(&line->lock);
return -EINTR;
}
line->state = PBLK_LINESTATE_OPEN;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
atomic_set(&line->left_eblks, blk_to_erase);
atomic_set(&line->left_seblks, blk_to_erase);
line->meta_distance = lm->meta_distance;
spin_unlock(&line->lock);
kref_init(&line->ref);
atomic_set(&line->sec_to_update, 0);
return 0;
}
/* Line allocations in the recovery path are always single threaded */
int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
int ret;
spin_lock(&l_mg->free_lock);
l_mg->data_line = line;
list_del(&line->list);
ret = pblk_line_prepare(pblk, line);
if (ret) {
list_add(&line->list, &l_mg->free_list);
spin_unlock(&l_mg->free_lock);
return ret;
}
spin_unlock(&l_mg->free_lock);
ret = pblk_line_alloc_bitmaps(pblk, line);
if (ret)
goto fail;
if (!pblk_line_init_bb(pblk, line, 0)) {
ret = -EINTR;
goto fail;
}
pblk_rl_free_lines_dec(&pblk->rl, line, true);
return 0;
fail:
spin_lock(&l_mg->free_lock);
list_add(&line->list, &l_mg->free_list);
spin_unlock(&l_mg->free_lock);
return ret;
}
void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
mempool_free(line->map_bitmap, l_mg->bitmap_pool);
line->map_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
}
static void pblk_line_reinit(struct pblk_line *line)
{
*line->vsc = cpu_to_le32(EMPTY_ENTRY);
line->map_bitmap = NULL;
line->invalid_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
}
void pblk_line_free(struct pblk_line *line)
{
struct pblk *pblk = line->pblk;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
mempool_free(line->map_bitmap, l_mg->bitmap_pool);
mempool_free(line->invalid_bitmap, l_mg->bitmap_pool);
pblk_line_reinit(line);
}
struct pblk_line *pblk_line_get(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_line *line;
int ret, bit;
lockdep_assert_held(&l_mg->free_lock);
retry:
if (list_empty(&l_mg->free_list)) {
pblk_err(pblk, "no free lines\n");
return NULL;
}
line = list_first_entry(&l_mg->free_list, struct pblk_line, list);
list_del(&line->list);
l_mg->nr_free_lines--;
bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
if (unlikely(bit >= lm->blk_per_line)) {
spin_lock(&line->lock);
line->state = PBLK_LINESTATE_BAD;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
spin_unlock(&line->lock);
list_add_tail(&line->list, &l_mg->bad_list);
pblk_debug(pblk, "line %d is bad\n", line->id);
goto retry;
}
ret = pblk_line_prepare(pblk, line);
if (ret) {
switch (ret) {
case -EAGAIN:
list_add(&line->list, &l_mg->bad_list);
goto retry;
case -EINTR:
list_add(&line->list, &l_mg->corrupt_list);
goto retry;
default:
pblk_err(pblk, "failed to prepare line %d\n", line->id);
list_add(&line->list, &l_mg->free_list);
l_mg->nr_free_lines++;
return NULL;
}
}
return line;
}
static struct pblk_line *pblk_line_retry(struct pblk *pblk,
struct pblk_line *line)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line *retry_line;
retry:
spin_lock(&l_mg->free_lock);
retry_line = pblk_line_get(pblk);
if (!retry_line) {
l_mg->data_line = NULL;
spin_unlock(&l_mg->free_lock);
return NULL;
}
retry_line->map_bitmap = line->map_bitmap;
retry_line->invalid_bitmap = line->invalid_bitmap;
retry_line->smeta = line->smeta;
retry_line->emeta = line->emeta;
retry_line->meta_line = line->meta_line;
pblk_line_reinit(line);
l_mg->data_line = retry_line;
spin_unlock(&l_mg->free_lock);
pblk_rl_free_lines_dec(&pblk->rl, line, false);
if (pblk_line_erase(pblk, retry_line))
goto retry;
return retry_line;
}
static void pblk_set_space_limit(struct pblk *pblk)
{
struct pblk_rl *rl = &pblk->rl;
atomic_set(&rl->rb_space, 0);
}
struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line *line;
spin_lock(&l_mg->free_lock);
line = pblk_line_get(pblk);
if (!line) {
spin_unlock(&l_mg->free_lock);
return NULL;
}
line->seq_nr = l_mg->d_seq_nr++;
line->type = PBLK_LINETYPE_DATA;
l_mg->data_line = line;
pblk_line_setup_metadata(line, l_mg, &pblk->lm);
/* Allocate next line for preparation */
l_mg->data_next = pblk_line_get(pblk);
if (!l_mg->data_next) {
/* If we cannot get a new line, we need to stop the pipeline.
* Only allow as many writes in as we can store safely and then
* fail gracefully
*/
pblk_set_space_limit(pblk);
l_mg->data_next = NULL;
} else {
l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
l_mg->data_next->type = PBLK_LINETYPE_DATA;
}
spin_unlock(&l_mg->free_lock);
if (pblk_line_alloc_bitmaps(pblk, line))
return NULL;
if (pblk_line_erase(pblk, line)) {
line = pblk_line_retry(pblk, line);
if (!line)
return NULL;
}
retry_setup:
if (!pblk_line_init_metadata(pblk, line, NULL)) {
line = pblk_line_retry(pblk, line);
if (!line)
return NULL;
goto retry_setup;
}
if (!pblk_line_init_bb(pblk, line, 1)) {
line = pblk_line_retry(pblk, line);
if (!line)
return NULL;
goto retry_setup;
}
pblk_rl_free_lines_dec(&pblk->rl, line, true);
return line;
}
void pblk_ppa_to_line_put(struct pblk *pblk, struct ppa_addr ppa)
{
struct pblk_line *line;
line = pblk_ppa_to_line(pblk, ppa);
kref_put(&line->ref, pblk_line_put_wq);
}
void pblk_rq_to_line_put(struct pblk *pblk, struct nvm_rq *rqd)
{
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
int i;
for (i = 0; i < rqd->nr_ppas; i++)
pblk_ppa_to_line_put(pblk, ppa_list[i]);
}
static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line)
{
lockdep_assert_held(&pblk->l_mg.free_lock);
pblk_set_space_limit(pblk);
pblk->state = PBLK_STATE_STOPPING;
trace_pblk_state(pblk_disk_name(pblk), pblk->state);
}
static void pblk_line_close_meta_sync(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_line *line, *tline;
LIST_HEAD(list);
spin_lock(&l_mg->close_lock);
if (list_empty(&l_mg->emeta_list)) {
spin_unlock(&l_mg->close_lock);
return;
}
list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev);
spin_unlock(&l_mg->close_lock);
list_for_each_entry_safe(line, tline, &list, list) {
struct pblk_emeta *emeta = line->emeta;
while (emeta->mem < lm->emeta_len[0]) {
int ret;
ret = pblk_submit_meta_io(pblk, line);
if (ret) {
pblk_err(pblk, "sync meta line %d failed (%d)\n",
line->id, ret);
return;
}
}
}
pblk_wait_for_meta(pblk);
flush_workqueue(pblk->close_wq);
}
void __pblk_pipeline_flush(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
int ret;
spin_lock(&l_mg->free_lock);
if (pblk->state == PBLK_STATE_RECOVERING ||
pblk->state == PBLK_STATE_STOPPED) {
spin_unlock(&l_mg->free_lock);
return;
}
pblk->state = PBLK_STATE_RECOVERING;
trace_pblk_state(pblk_disk_name(pblk), pblk->state);
spin_unlock(&l_mg->free_lock);
pblk_flush_writer(pblk);
pblk_wait_for_meta(pblk);
ret = pblk_recov_pad(pblk);
if (ret) {
pblk_err(pblk, "could not close data on teardown(%d)\n", ret);
return;
}
flush_workqueue(pblk->bb_wq);
pblk_line_close_meta_sync(pblk);
}
void __pblk_pipeline_stop(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
spin_lock(&l_mg->free_lock);
pblk->state = PBLK_STATE_STOPPED;
trace_pblk_state(pblk_disk_name(pblk), pblk->state);
l_mg->data_line = NULL;
l_mg->data_next = NULL;
spin_unlock(&l_mg->free_lock);
}
void pblk_pipeline_stop(struct pblk *pblk)
{
__pblk_pipeline_flush(pblk);
__pblk_pipeline_stop(pblk);
}
struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line *cur, *new = NULL;
unsigned int left_seblks;
new = l_mg->data_next;
if (!new)
goto out;
spin_lock(&l_mg->free_lock);
cur = l_mg->data_line;
l_mg->data_line = new;
pblk_line_setup_metadata(new, l_mg, &pblk->lm);
spin_unlock(&l_mg->free_lock);
retry_erase:
left_seblks = atomic_read(&new->left_seblks);
if (left_seblks) {
/* If line is not fully erased, erase it */
if (atomic_read(&new->left_eblks)) {
if (pblk_line_erase(pblk, new))
goto out;
} else {
io_schedule();
}
goto retry_erase;
}
if (pblk_line_alloc_bitmaps(pblk, new))
return NULL;
retry_setup:
if (!pblk_line_init_metadata(pblk, new, cur)) {
new = pblk_line_retry(pblk, new);
if (!new)
goto out;
goto retry_setup;
}
if (!pblk_line_init_bb(pblk, new, 1)) {
new = pblk_line_retry(pblk, new);
if (!new)
goto out;
goto retry_setup;
}
pblk_rl_free_lines_dec(&pblk->rl, new, true);
/* Allocate next line for preparation */
spin_lock(&l_mg->free_lock);
l_mg->data_next = pblk_line_get(pblk);
if (!l_mg->data_next) {
/* If we cannot get a new line, we need to stop the pipeline.
* Only allow as many writes in as we can store safely and then
* fail gracefully
*/
pblk_stop_writes(pblk, new);
l_mg->data_next = NULL;
} else {
l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
l_mg->data_next->type = PBLK_LINETYPE_DATA;
}
spin_unlock(&l_mg->free_lock);
out:
return new;
}
static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_gc *gc = &pblk->gc;
spin_lock(&line->lock);
WARN_ON(line->state != PBLK_LINESTATE_GC);
if (line->w_err_gc->has_gc_err) {
spin_unlock(&line->lock);
pblk_err(pblk, "line %d had errors during GC\n", line->id);
pblk_put_line_back(pblk, line);
line->w_err_gc->has_gc_err = 0;
return;
}
line->state = PBLK_LINESTATE_FREE;
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
line->gc_group = PBLK_LINEGC_NONE;
pblk_line_free(line);
if (line->w_err_gc->has_write_err) {
pblk_rl_werr_line_out(&pblk->rl);
line->w_err_gc->has_write_err = 0;
}
spin_unlock(&line->lock);
atomic_dec(&gc->pipeline_gc);
spin_lock(&l_mg->free_lock);
list_add_tail(&line->list, &l_mg->free_list);
l_mg->nr_free_lines++;
spin_unlock(&l_mg->free_lock);
pblk_rl_free_lines_inc(&pblk->rl, line);
}
static void pblk_line_put_ws(struct work_struct *work)
{
struct pblk_line_ws *line_put_ws = container_of(work,
struct pblk_line_ws, ws);
struct pblk *pblk = line_put_ws->pblk;
struct pblk_line *line = line_put_ws->line;
__pblk_line_put(pblk, line);
mempool_free(line_put_ws, &pblk->gen_ws_pool);
}
void pblk_line_put(struct kref *ref)
{
struct pblk_line *line = container_of(ref, struct pblk_line, ref);
struct pblk *pblk = line->pblk;
__pblk_line_put(pblk, line);
}
void pblk_line_put_wq(struct kref *ref)
{
struct pblk_line *line = container_of(ref, struct pblk_line, ref);
struct pblk *pblk = line->pblk;
struct pblk_line_ws *line_put_ws;
line_put_ws = mempool_alloc(&pblk->gen_ws_pool, GFP_ATOMIC);
if (!line_put_ws)
return;
line_put_ws->pblk = pblk;
line_put_ws->line = line;
line_put_ws->priv = NULL;
INIT_WORK(&line_put_ws->ws, pblk_line_put_ws);
queue_work(pblk->r_end_wq, &line_put_ws->ws);
}
int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
{
struct nvm_rq *rqd;
int err;
rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);
pblk_setup_e_rq(pblk, rqd, ppa);
rqd->end_io = pblk_end_io_erase;
rqd->private = pblk;
trace_pblk_chunk_reset(pblk_disk_name(pblk),
&ppa, PBLK_CHUNK_RESET_START);
/* The write thread schedules erases so that it minimizes disturbances
* with writes. Thus, there is no need to take the LUN semaphore.
*/
err = pblk_submit_io(pblk, rqd, NULL);
if (err) {
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
pblk_err(pblk, "could not async erase line:%d,blk:%d\n",
pblk_ppa_to_line_id(ppa),
pblk_ppa_to_pos(geo, ppa));
}
return err;
}
struct pblk_line *pblk_line_get_data(struct pblk *pblk)
{
return pblk->l_mg.data_line;
}
/* For now, always erase next line */
struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
{
return pblk->l_mg.data_next;
}
int pblk_line_is_full(struct pblk_line *line)
{
return (line->left_msecs == 0);
}
static void pblk_line_should_sync_meta(struct pblk *pblk)
{
if (pblk_rl_is_limit(&pblk->rl))
pblk_line_close_meta_sync(pblk);
}
void pblk_line_close(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_line_mgmt *l_mg = &pblk->l_mg;
struct list_head *move_list;
int i;
#ifdef CONFIG_NVM_PBLK_DEBUG
WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
"pblk: corrupt closed line %d\n", line->id);
#endif
spin_lock(&l_mg->free_lock);
WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap));
spin_unlock(&l_mg->free_lock);
spin_lock(&l_mg->gc_lock);
spin_lock(&line->lock);
WARN_ON(line->state != PBLK_LINESTATE_OPEN);
line->state = PBLK_LINESTATE_CLOSED;
move_list = pblk_line_gc_list(pblk, line);
list_add_tail(&line->list, move_list);
mempool_free(line->map_bitmap, l_mg->bitmap_pool);
line->map_bitmap = NULL;
line->smeta = NULL;
line->emeta = NULL;
for (i = 0; i < lm->blk_per_line; i++) {
struct pblk_lun *rlun = &pblk->luns[i];
int pos = pblk_ppa_to_pos(geo, rlun->bppa);
int state = line->chks[pos].state;
if (!(state & NVM_CHK_ST_OFFLINE))
state = NVM_CHK_ST_CLOSED;
}
spin_unlock(&line->lock);
spin_unlock(&l_mg->gc_lock);
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
}
void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_emeta *emeta = line->emeta;
struct line_emeta *emeta_buf = emeta->buf;
struct wa_counters *wa = emeta_to_wa(lm, emeta_buf);
/* No need for exact vsc value; avoid a big line lock and take aprox. */
memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len);
memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len);
wa->user = cpu_to_le64(atomic64_read(&pblk->user_wa));
wa->pad = cpu_to_le64(atomic64_read(&pblk->pad_wa));
wa->gc = cpu_to_le64(atomic64_read(&pblk->gc_wa));
if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) {
emeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
guid_copy((guid_t *)&emeta_buf->header.uuid,
&pblk->instance_uuid);
emeta_buf->header.id = cpu_to_le32(line->id);
emeta_buf->header.type = cpu_to_le16(line->type);
emeta_buf->header.version_major = EMETA_VERSION_MAJOR;
emeta_buf->header.version_minor = EMETA_VERSION_MINOR;
emeta_buf->header.crc = cpu_to_le32(
pblk_calc_meta_header_crc(pblk, &emeta_buf->header));
}
emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas);
emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf));
spin_lock(&l_mg->close_lock);
spin_lock(&line->lock);
/* Update the in-memory start address for emeta, in case it has
* shifted due to write errors
*/
if (line->emeta_ssec != line->cur_sec)
line->emeta_ssec = line->cur_sec;
list_add_tail(&line->list, &l_mg->emeta_list);
spin_unlock(&line->lock);
spin_unlock(&l_mg->close_lock);
pblk_line_should_sync_meta(pblk);
}
static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
unsigned int lba_list_size = lm->emeta_len[2];
struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
struct pblk_emeta *emeta = line->emeta;
w_err_gc->lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf),
lba_list_size);
}
void pblk_line_close_ws(struct work_struct *work)
{
struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
ws);
struct pblk *pblk = line_ws->pblk;
struct pblk_line *line = line_ws->line;
struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
/* Write errors makes the emeta start address stored in smeta invalid,
* so keep a copy of the lba list until we've gc'd the line
*/
if (w_err_gc->has_write_err)
pblk_save_lba_list(pblk, line);
pblk_line_close(pblk, line);
mempool_free(line_ws, &pblk->gen_ws_pool);
}
void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
void (*work)(struct work_struct *), gfp_t gfp_mask,
struct workqueue_struct *wq)
{
struct pblk_line_ws *line_ws;
line_ws = mempool_alloc(&pblk->gen_ws_pool, gfp_mask);
line_ws->pblk = pblk;
line_ws->line = line;
line_ws->priv = priv;
INIT_WORK(&line_ws->ws, work);
queue_work(wq, &line_ws->ws);
}
static void __pblk_down_chunk(struct pblk *pblk, int pos)
{
struct pblk_lun *rlun = &pblk->luns[pos];
int ret;
/*
* Only send one inflight I/O per LUN. Since we map at a page
* granurality, all ppas in the I/O will map to the same LUN
*/
ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
if (ret == -ETIME || ret == -EINTR)
pblk_err(pblk, "taking lun semaphore timed out: err %d\n",
-ret);
}
void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int pos = pblk_ppa_to_pos(geo, ppa);
__pblk_down_chunk(pblk, pos);
}
void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa,
unsigned long *lun_bitmap)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int pos = pblk_ppa_to_pos(geo, ppa);
/* If the LUN has been locked for this same request, do no attempt to
* lock it again
*/
if (test_and_set_bit(pos, lun_bitmap))
return;
__pblk_down_chunk(pblk, pos);
}
void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_lun *rlun;
int pos = pblk_ppa_to_pos(geo, ppa);
rlun = &pblk->luns[pos];
up(&rlun->wr_sem);
}
void pblk_up_rq(struct pblk *pblk, unsigned long *lun_bitmap)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_lun *rlun;
int num_lun = geo->all_luns;
int bit = -1;
while ((bit = find_next_bit(lun_bitmap, num_lun, bit + 1)) < num_lun) {
rlun = &pblk->luns[bit];
up(&rlun->wr_sem);
}
}
void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
{
struct ppa_addr ppa_l2p;
/* logic error: lba out-of-bounds. Ignore update */
if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
return;
}
spin_lock(&pblk->trans_lock);
ppa_l2p = pblk_trans_map_get(pblk, lba);
if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p))
pblk_map_invalidate(pblk, ppa_l2p);
pblk_trans_map_set(pblk, lba, ppa);
spin_unlock(&pblk->trans_lock);
}
void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
{
#ifdef CONFIG_NVM_PBLK_DEBUG
/* Callers must ensure that the ppa points to a cache address */
BUG_ON(!pblk_addr_in_cache(ppa));
BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
#endif
pblk_update_map(pblk, lba, ppa);
}
int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
struct pblk_line *gc_line, u64 paddr_gc)
{
struct ppa_addr ppa_l2p, ppa_gc;
int ret = 1;
#ifdef CONFIG_NVM_PBLK_DEBUG
/* Callers must ensure that the ppa points to a cache address */
BUG_ON(!pblk_addr_in_cache(ppa_new));
BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new)));
#endif
/* logic error: lba out-of-bounds. Ignore update */
if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
return 0;
}
spin_lock(&pblk->trans_lock);
ppa_l2p = pblk_trans_map_get(pblk, lba);
ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id);
if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) {
spin_lock(&gc_line->lock);
WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap),
"pblk: corrupted GC update");
spin_unlock(&gc_line->lock);
ret = 0;
goto out;
}
pblk_trans_map_set(pblk, lba, ppa_new);
out:
spin_unlock(&pblk->trans_lock);
return ret;
}
void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache)
{
struct ppa_addr ppa_l2p;
#ifdef CONFIG_NVM_PBLK_DEBUG
/* Callers must ensure that the ppa points to a device address */
BUG_ON(pblk_addr_in_cache(ppa_mapped));
#endif
/* Invalidate and discard padded entries */
if (lba == ADDR_EMPTY) {
atomic64_inc(&pblk->pad_wa);
#ifdef CONFIG_NVM_PBLK_DEBUG
atomic_long_inc(&pblk->padded_wb);
#endif
if (!pblk_ppa_empty(ppa_mapped))
pblk_map_invalidate(pblk, ppa_mapped);
return;
}
/* logic error: lba out-of-bounds. Ignore update */
if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
return;
}
spin_lock(&pblk->trans_lock);
ppa_l2p = pblk_trans_map_get(pblk, lba);
/* Do not update L2P if the cacheline has been updated. In this case,
* the mapped ppa must be invalidated
*/
if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) {
if (!pblk_ppa_empty(ppa_mapped))
pblk_map_invalidate(pblk, ppa_mapped);
goto out;
}
#ifdef CONFIG_NVM_PBLK_DEBUG
WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p));
#endif
pblk_trans_map_set(pblk, lba, ppa_mapped);
out:
spin_unlock(&pblk->trans_lock);
}
int pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
sector_t blba, int nr_secs, bool *from_cache)
{
int i;
spin_lock(&pblk->trans_lock);
for (i = 0; i < nr_secs; i++) {
struct ppa_addr ppa;
ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i);
/* If the L2P entry maps to a line, the reference is valid */
if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) {
struct pblk_line *line = pblk_ppa_to_line(pblk, ppa);
if (i > 0 && *from_cache)
break;
*from_cache = false;
kref_get(&line->ref);
} else {
if (i > 0 && !*from_cache)
break;
*from_cache = true;
}
}
spin_unlock(&pblk->trans_lock);
return i;
}
void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
u64 *lba_list, int nr_secs)
{
u64 lba;
int i;
spin_lock(&pblk->trans_lock);
for (i = 0; i < nr_secs; i++) {
lba = lba_list[i];
if (lba != ADDR_EMPTY) {
/* logic error: lba out-of-bounds. Ignore update */
if (!(lba < pblk->capacity)) {
WARN(1, "pblk: corrupted L2P map request\n");
continue;
}
ppas[i] = pblk_trans_map_get(pblk, lba);
}
}
spin_unlock(&pblk->trans_lock);
}
void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd)
{
void *buffer;
if (pblk_is_oob_meta_supported(pblk)) {
/* Just use OOB metadata buffer as always */
buffer = rqd->meta_list;
} else {
/* We need to reuse last page of request (packed metadata)
* in similar way as traditional oob metadata
*/
buffer = page_to_virt(
rqd->bio->bi_io_vec[rqd->bio->bi_vcnt - 1].bv_page);
}
return buffer;
}
void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd)
{
void *meta_list = rqd->meta_list;
void *page;
int i = 0;
if (pblk_is_oob_meta_supported(pblk))
return;
page = page_to_virt(rqd->bio->bi_io_vec[rqd->bio->bi_vcnt - 1].bv_page);
/* We need to fill oob meta buffer with data from packed metadata */
for (; i < rqd->nr_ppas; i++)
memcpy(pblk_get_meta(pblk, meta_list, i),
page + (i * sizeof(struct pblk_sec_meta)),
sizeof(struct pblk_sec_meta));
}