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pblk-core.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 CNEX Labs
* Initial release: Javier Gonzalez <[email protected]>
* Matias Bjorling <[email protected]>
*
* 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)
{
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);
}
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)
{
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);
if (trace_pblk_chunk_state_enabled() && !ret &&
rqd->opcode == NVM_OP_PWRITE)
pblk_check_chunk_state_update(pblk, rqd);
return ret;
}
int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd)
{
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);
pblk_up_chunk(pblk, ppa_list[0]);
return ret;
}
static void pblk_bio_map_addr_endio(struct bio *bio)
{
bio_put(bio);
}
struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
unsigned int nr_secs, unsigned int len,
int alloc_type, gfp_t gfp_mask)
{
struct nvm_tgt_dev *dev = pblk->dev;
void *kaddr = data;
struct page *page;
struct bio *bio;
int i, ret;
if (alloc_type == PBLK_KMALLOC_META)
return bio_map_kern(dev->q, kaddr, len, gfp_mask);
bio = bio_kmalloc(gfp_mask, nr_secs);
if (!bio)
return ERR_PTR(-ENOMEM);
for (i = 0; i < nr_secs; i++) {
page = vmalloc_to_page(kaddr);
if (!page) {
pblk_err(pblk, "could not map vmalloc bio\n");
bio_put(bio);
bio = ERR_PTR(-ENOMEM);
goto out;
}
ret = bio_add_pc_page(dev->q, bio, page, PAGE_SIZE, 0);
if (ret != PAGE_SIZE) {
pblk_err(pblk, "could not add page to bio\n");
bio_put(bio);
bio = ERR_PTR(-ENOMEM);
goto out;
}
kaddr += PAGE_SIZE;
}
bio->bi_end_io = pblk_bio_map_addr_endio;
out:
return bio;
}
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 nvm_tgt_dev *dev = pblk->dev;
struct pblk_line_meta *lm = &pblk->lm;
struct bio *bio;
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;
bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
goto clear_rqd;
}
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.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);
if (ret) {
pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
bio_put(bio);
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 nvm_tgt_dev *dev = pblk->dev;
struct pblk_line_meta *lm = &pblk->lm;
struct bio *bio;
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;
bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
goto clear_rqd;
}
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
rqd.bio = bio;
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);
if (ret) {
pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
bio_put(bio);
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_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
void *ppa_list_buf, *meta_list;
struct bio *bio;
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;
bio = pblk_bio_map_addr(pblk, emeta_buf, rq_ppas, rq_len,
l_mg->emeta_alloc_type, GFP_KERNEL);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
goto free_rqd_dma;
}
bio->bi_iter.bi_sector = 0; /* internal bio */
bio_set_op_attrs(bio, REQ_OP_READ, 0);
rqd.bio = bio;
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)) {
bio_put(bio);
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)) {
bio_put(bio);
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);
if (ret) {
pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
bio_put(bio);
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);
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;
}