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pblk-init.c
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/*
* Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
* 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.
*
* Implementation of a physical block-device target for Open-channel SSDs.
*
* pblk-init.c - pblk's initialization.
*/
#include "pblk.h"
static struct kmem_cache *pblk_blk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
*pblk_w_rq_cache, *pblk_line_meta_cache;
static DECLARE_RWSEM(pblk_lock);
struct bio_set *pblk_bio_set;
static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
struct bio *bio)
{
int ret;
/* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
* constraint. Writes can be of arbitrary size.
*/
if (bio_data_dir(bio) == READ) {
blk_queue_split(q, &bio);
ret = pblk_submit_read(pblk, bio);
if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
bio_put(bio);
return ret;
}
/* Prevent deadlock in the case of a modest LUN configuration and large
* user I/Os. Unless stalled, the rate limiter leaves at least 256KB
* available for user I/O.
*/
if (unlikely(pblk_get_secs(bio) >= pblk_rl_sysfs_rate_show(&pblk->rl)))
blk_queue_split(q, &bio);
return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
}
static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
{
struct pblk *pblk = q->queuedata;
if (bio_op(bio) == REQ_OP_DISCARD) {
pblk_discard(pblk, bio);
if (!(bio->bi_opf & REQ_PREFLUSH)) {
bio_endio(bio);
return BLK_QC_T_NONE;
}
}
switch (pblk_rw_io(q, pblk, bio)) {
case NVM_IO_ERR:
bio_io_error(bio);
break;
case NVM_IO_DONE:
bio_endio(bio);
break;
}
return BLK_QC_T_NONE;
}
static void pblk_l2p_free(struct pblk *pblk)
{
vfree(pblk->trans_map);
}
static int pblk_l2p_init(struct pblk *pblk)
{
sector_t i;
struct ppa_addr ppa;
int entry_size = 8;
if (pblk->ppaf_bitsize < 32)
entry_size = 4;
pblk->trans_map = vmalloc(entry_size * pblk->rl.nr_secs);
if (!pblk->trans_map)
return -ENOMEM;
pblk_ppa_set_empty(&ppa);
for (i = 0; i < pblk->rl.nr_secs; i++)
pblk_trans_map_set(pblk, i, ppa);
return 0;
}
static void pblk_rwb_free(struct pblk *pblk)
{
if (pblk_rb_tear_down_check(&pblk->rwb))
pr_err("pblk: write buffer error on tear down\n");
pblk_rb_data_free(&pblk->rwb);
vfree(pblk_rb_entries_ref(&pblk->rwb));
}
static int pblk_rwb_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_rb_entry *entries;
unsigned long nr_entries;
unsigned int power_size, power_seg_sz;
nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer);
entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry));
if (!entries)
return -ENOMEM;
power_size = get_count_order(nr_entries);
power_seg_sz = get_count_order(geo->sec_size);
return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
}
/* Minimum pages needed within a lun */
#define PAGE_POOL_SIZE 16
#define ADDR_POOL_SIZE 64
static int pblk_set_ppaf(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct nvm_addr_format ppaf = geo->ppaf;
int power_len;
/* Re-calculate channel and lun format to adapt to configuration */
power_len = get_count_order(geo->nr_chnls);
if (1 << power_len != geo->nr_chnls) {
pr_err("pblk: supports only power-of-two channel config.\n");
return -EINVAL;
}
ppaf.ch_len = power_len;
power_len = get_count_order(geo->luns_per_chnl);
if (1 << power_len != geo->luns_per_chnl) {
pr_err("pblk: supports only power-of-two LUN config.\n");
return -EINVAL;
}
ppaf.lun_len = power_len;
pblk->ppaf.sec_offset = 0;
pblk->ppaf.pln_offset = ppaf.sect_len;
pblk->ppaf.ch_offset = pblk->ppaf.pln_offset + ppaf.pln_len;
pblk->ppaf.lun_offset = pblk->ppaf.ch_offset + ppaf.ch_len;
pblk->ppaf.pg_offset = pblk->ppaf.lun_offset + ppaf.lun_len;
pblk->ppaf.blk_offset = pblk->ppaf.pg_offset + ppaf.pg_len;
pblk->ppaf.sec_mask = (1ULL << ppaf.sect_len) - 1;
pblk->ppaf.pln_mask = ((1ULL << ppaf.pln_len) - 1) <<
pblk->ppaf.pln_offset;
pblk->ppaf.ch_mask = ((1ULL << ppaf.ch_len) - 1) <<
pblk->ppaf.ch_offset;
pblk->ppaf.lun_mask = ((1ULL << ppaf.lun_len) - 1) <<
pblk->ppaf.lun_offset;
pblk->ppaf.pg_mask = ((1ULL << ppaf.pg_len) - 1) <<
pblk->ppaf.pg_offset;
pblk->ppaf.blk_mask = ((1ULL << ppaf.blk_len) - 1) <<
pblk->ppaf.blk_offset;
pblk->ppaf_bitsize = pblk->ppaf.blk_offset + ppaf.blk_len;
return 0;
}
static int pblk_init_global_caches(struct pblk *pblk)
{
char cache_name[PBLK_CACHE_NAME_LEN];
down_write(&pblk_lock);
pblk_blk_ws_cache = kmem_cache_create("pblk_blk_ws",
sizeof(struct pblk_line_ws), 0, 0, NULL);
if (!pblk_blk_ws_cache) {
up_write(&pblk_lock);
return -ENOMEM;
}
pblk_rec_cache = kmem_cache_create("pblk_rec",
sizeof(struct pblk_rec_ctx), 0, 0, NULL);
if (!pblk_rec_cache) {
kmem_cache_destroy(pblk_blk_ws_cache);
up_write(&pblk_lock);
return -ENOMEM;
}
pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
0, 0, NULL);
if (!pblk_g_rq_cache) {
kmem_cache_destroy(pblk_blk_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
up_write(&pblk_lock);
return -ENOMEM;
}
pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
0, 0, NULL);
if (!pblk_w_rq_cache) {
kmem_cache_destroy(pblk_blk_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
kmem_cache_destroy(pblk_g_rq_cache);
up_write(&pblk_lock);
return -ENOMEM;
}
snprintf(cache_name, sizeof(cache_name), "pblk_line_m_%s",
pblk->disk->disk_name);
pblk_line_meta_cache = kmem_cache_create(cache_name,
pblk->lm.sec_bitmap_len, 0, 0, NULL);
if (!pblk_line_meta_cache) {
kmem_cache_destroy(pblk_blk_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
kmem_cache_destroy(pblk_g_rq_cache);
kmem_cache_destroy(pblk_w_rq_cache);
up_write(&pblk_lock);
return -ENOMEM;
}
up_write(&pblk_lock);
return 0;
}
static int pblk_core_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg *
geo->nr_planes * geo->nr_luns;
if (pblk_init_global_caches(pblk))
return -ENOMEM;
pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0);
if (!pblk->page_pool)
return -ENOMEM;
pblk->line_ws_pool = mempool_create_slab_pool(PBLK_WS_POOL_SIZE,
pblk_blk_ws_cache);
if (!pblk->line_ws_pool)
goto free_page_pool;
pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache);
if (!pblk->rec_pool)
goto free_blk_ws_pool;
pblk->g_rq_pool = mempool_create_slab_pool(PBLK_READ_REQ_POOL_SIZE,
pblk_g_rq_cache);
if (!pblk->g_rq_pool)
goto free_rec_pool;
pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns * 2,
pblk_w_rq_cache);
if (!pblk->w_rq_pool)
goto free_g_rq_pool;
pblk->line_meta_pool =
mempool_create_slab_pool(PBLK_META_POOL_SIZE,
pblk_line_meta_cache);
if (!pblk->line_meta_pool)
goto free_w_rq_pool;
pblk->close_wq = alloc_workqueue("pblk-close-wq",
WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
if (!pblk->close_wq)
goto free_line_meta_pool;
pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
if (!pblk->bb_wq)
goto free_close_wq;
if (pblk_set_ppaf(pblk))
goto free_bb_wq;
if (pblk_rwb_init(pblk))
goto free_bb_wq;
INIT_LIST_HEAD(&pblk->compl_list);
return 0;
free_bb_wq:
destroy_workqueue(pblk->bb_wq);
free_close_wq:
destroy_workqueue(pblk->close_wq);
free_line_meta_pool:
mempool_destroy(pblk->line_meta_pool);
free_w_rq_pool:
mempool_destroy(pblk->w_rq_pool);
free_g_rq_pool:
mempool_destroy(pblk->g_rq_pool);
free_rec_pool:
mempool_destroy(pblk->rec_pool);
free_blk_ws_pool:
mempool_destroy(pblk->line_ws_pool);
free_page_pool:
mempool_destroy(pblk->page_pool);
return -ENOMEM;
}
static void pblk_core_free(struct pblk *pblk)
{
if (pblk->close_wq)
destroy_workqueue(pblk->close_wq);
if (pblk->bb_wq)
destroy_workqueue(pblk->bb_wq);
mempool_destroy(pblk->page_pool);
mempool_destroy(pblk->line_ws_pool);
mempool_destroy(pblk->rec_pool);
mempool_destroy(pblk->g_rq_pool);
mempool_destroy(pblk->w_rq_pool);
mempool_destroy(pblk->line_meta_pool);
kmem_cache_destroy(pblk_blk_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
kmem_cache_destroy(pblk_g_rq_cache);
kmem_cache_destroy(pblk_w_rq_cache);
kmem_cache_destroy(pblk_line_meta_cache);
}
static void pblk_luns_free(struct pblk *pblk)
{
kfree(pblk->luns);
}
static void pblk_free_line_bitmaps(struct pblk_line *line)
{
kfree(line->blk_bitmap);
kfree(line->erase_bitmap);
}
static void pblk_lines_free(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line *line;
int i;
spin_lock(&l_mg->free_lock);
for (i = 0; i < l_mg->nr_lines; i++) {
line = &pblk->lines[i];
pblk_line_free(pblk, line);
pblk_free_line_bitmaps(line);
}
spin_unlock(&l_mg->free_lock);
}
static void pblk_line_meta_free(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
int i;
kfree(l_mg->bb_template);
kfree(l_mg->bb_aux);
kfree(l_mg->vsc_list);
spin_lock(&l_mg->free_lock);
for (i = 0; i < PBLK_DATA_LINES; i++) {
kfree(l_mg->sline_meta[i]);
pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
kfree(l_mg->eline_meta[i]);
}
spin_unlock(&l_mg->free_lock);
kfree(pblk->lines);
}
static int pblk_bb_discovery(struct nvm_tgt_dev *dev, struct pblk_lun *rlun)
{
struct nvm_geo *geo = &dev->geo;
struct ppa_addr ppa;
u8 *blks;
int nr_blks, ret;
nr_blks = geo->blks_per_lun * geo->plane_mode;
blks = kmalloc(nr_blks, GFP_KERNEL);
if (!blks)
return -ENOMEM;
ppa.ppa = 0;
ppa.g.ch = rlun->bppa.g.ch;
ppa.g.lun = rlun->bppa.g.lun;
ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
if (ret)
goto out;
nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
if (nr_blks < 0) {
ret = nr_blks;
goto out;
}
rlun->bb_list = blks;
return 0;
out:
kfree(blks);
return ret;
}
static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line,
int blk_per_line)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_lun *rlun;
int bb_cnt = 0;
int i;
for (i = 0; i < blk_per_line; i++) {
rlun = &pblk->luns[i];
if (rlun->bb_list[line->id] == NVM_BLK_T_FREE)
continue;
set_bit(pblk_ppa_to_pos(geo, rlun->bppa), line->blk_bitmap);
bb_cnt++;
}
return bb_cnt;
}
static int pblk_alloc_line_bitmaps(struct pblk *pblk, struct pblk_line *line)
{
struct pblk_line_meta *lm = &pblk->lm;
line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
if (!line->blk_bitmap)
return -ENOMEM;
line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
if (!line->erase_bitmap) {
kfree(line->blk_bitmap);
return -ENOMEM;
}
return 0;
}
static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_lun *rlun;
int i, ret;
/* TODO: Implement unbalanced LUN support */
if (geo->luns_per_chnl < 0) {
pr_err("pblk: unbalanced LUN config.\n");
return -EINVAL;
}
pblk->luns = kcalloc(geo->nr_luns, sizeof(struct pblk_lun), GFP_KERNEL);
if (!pblk->luns)
return -ENOMEM;
for (i = 0; i < geo->nr_luns; i++) {
/* Stripe across channels */
int ch = i % geo->nr_chnls;
int lun_raw = i / geo->nr_chnls;
int lunid = lun_raw + ch * geo->luns_per_chnl;
rlun = &pblk->luns[i];
rlun->bppa = luns[lunid];
sema_init(&rlun->wr_sem, 1);
ret = pblk_bb_discovery(dev, rlun);
if (ret) {
while (--i >= 0)
kfree(pblk->luns[i].bb_list);
return ret;
}
}
return 0;
}
static int pblk_lines_configure(struct pblk *pblk, int flags)
{
struct pblk_line *line = NULL;
int ret = 0;
if (!(flags & NVM_TARGET_FACTORY)) {
line = pblk_recov_l2p(pblk);
if (IS_ERR(line)) {
pr_err("pblk: could not recover l2p table\n");
ret = -EFAULT;
}
}
if (!line) {
/* Configure next line for user data */
line = pblk_line_get_first_data(pblk);
if (!line) {
pr_err("pblk: line list corrupted\n");
ret = -EFAULT;
}
}
return ret;
}
/* See comment over struct line_emeta definition */
static unsigned int calc_emeta_len(struct pblk *pblk)
{
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
/* Round to sector size so that lba_list starts on its own sector */
lm->emeta_sec[1] = DIV_ROUND_UP(
sizeof(struct line_emeta) + lm->blk_bitmap_len,
geo->sec_size);
lm->emeta_len[1] = lm->emeta_sec[1] * geo->sec_size;
/* Round to sector size so that vsc_list starts on its own sector */
lm->dsec_per_line = lm->sec_per_line - lm->emeta_sec[0];
lm->emeta_sec[2] = DIV_ROUND_UP(lm->dsec_per_line * sizeof(u64),
geo->sec_size);
lm->emeta_len[2] = lm->emeta_sec[2] * geo->sec_size;
lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
geo->sec_size);
lm->emeta_len[3] = lm->emeta_sec[3] * geo->sec_size;
lm->vsc_list_len = l_mg->nr_lines * sizeof(u32);
return (lm->emeta_len[1] + lm->emeta_len[2] + lm->emeta_len[3]);
}
static void pblk_set_provision(struct pblk *pblk, long nr_free_blks)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
sector_t provisioned;
pblk->over_pct = 20;
provisioned = nr_free_blks;
provisioned *= (100 - pblk->over_pct);
sector_div(provisioned, 100);
/* Internally pblk manages all free blocks, but all calculations based
* on user capacity consider only provisioned blocks
*/
pblk->rl.total_blocks = nr_free_blks;
pblk->rl.nr_secs = nr_free_blks * geo->sec_per_blk;
pblk->capacity = provisioned * geo->sec_per_blk;
atomic_set(&pblk->rl.free_blocks, nr_free_blks);
}
static int pblk_lines_alloc_metadata(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
int i;
/* smeta is always small enough to fit on a kmalloc memory allocation,
* emeta depends on the number of LUNs allocated to the pblk instance
*/
for (i = 0; i < PBLK_DATA_LINES; i++) {
l_mg->sline_meta[i] = kmalloc(lm->smeta_len, GFP_KERNEL);
if (!l_mg->sline_meta[i])
goto fail_free_smeta;
}
/* emeta allocates three different buffers for managing metadata with
* in-memory and in-media layouts
*/
for (i = 0; i < PBLK_DATA_LINES; i++) {
struct pblk_emeta *emeta;
emeta = kmalloc(sizeof(struct pblk_emeta), GFP_KERNEL);
if (!emeta)
goto fail_free_emeta;
if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
emeta->buf = vmalloc(lm->emeta_len[0]);
if (!emeta->buf) {
kfree(emeta);
goto fail_free_emeta;
}
emeta->nr_entries = lm->emeta_sec[0];
l_mg->eline_meta[i] = emeta;
} else {
l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
if (!emeta->buf) {
kfree(emeta);
goto fail_free_emeta;
}
emeta->nr_entries = lm->emeta_sec[0];
l_mg->eline_meta[i] = emeta;
}
}
l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
if (!l_mg->vsc_list)
goto fail_free_emeta;
for (i = 0; i < l_mg->nr_lines; i++)
l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
return 0;
fail_free_emeta:
while (--i >= 0) {
vfree(l_mg->eline_meta[i]->buf);
kfree(l_mg->eline_meta[i]);
}
fail_free_smeta:
for (i = 0; i < PBLK_DATA_LINES; i++)
kfree(l_mg->sline_meta[i]);
return -ENOMEM;
}
static int pblk_lines_init(struct pblk *pblk)
{
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;
struct pblk_line *line;
unsigned int smeta_len, emeta_len;
long nr_bad_blks, nr_free_blks;
int bb_distance, max_write_ppas, mod;
int i, ret;
pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE);
max_write_ppas = pblk->min_write_pgs * geo->nr_luns;
pblk->max_write_pgs = (max_write_ppas < nvm_max_phys_sects(dev)) ?
max_write_ppas : nvm_max_phys_sects(dev);
pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
pr_err("pblk: cannot support device max_phys_sect\n");
return -EINVAL;
}
div_u64_rem(geo->sec_per_blk, pblk->min_write_pgs, &mod);
if (mod) {
pr_err("pblk: bad configuration of sectors/pages\n");
return -EINVAL;
}
l_mg->nr_lines = geo->blks_per_lun;
l_mg->log_line = l_mg->data_line = NULL;
l_mg->l_seq_nr = l_mg->d_seq_nr = 0;
l_mg->nr_free_lines = 0;
bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES);
lm->sec_per_line = geo->sec_per_blk * geo->nr_luns;
lm->blk_per_line = geo->nr_luns;
lm->blk_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long);
lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
lm->lun_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long);
lm->high_thrs = lm->sec_per_line / 2;
lm->mid_thrs = lm->sec_per_line / 4;
lm->meta_distance = (geo->nr_luns / 2) * pblk->min_write_pgs;
/* Calculate necessary pages for smeta. See comment over struct
* line_smeta definition
*/
i = 1;
add_smeta_page:
lm->smeta_sec = i * geo->sec_per_pl;
lm->smeta_len = lm->smeta_sec * geo->sec_size;
smeta_len = sizeof(struct line_smeta) + lm->lun_bitmap_len;
if (smeta_len > lm->smeta_len) {
i++;
goto add_smeta_page;
}
/* Calculate necessary pages for emeta. See comment over struct
* line_emeta definition
*/
i = 1;
add_emeta_page:
lm->emeta_sec[0] = i * geo->sec_per_pl;
lm->emeta_len[0] = lm->emeta_sec[0] * geo->sec_size;
emeta_len = calc_emeta_len(pblk);
if (emeta_len > lm->emeta_len[0]) {
i++;
goto add_emeta_page;
}
lm->emeta_bb = geo->nr_luns - i;
lm->min_blk_line = 1 + DIV_ROUND_UP(lm->smeta_sec + lm->emeta_sec[0],
geo->sec_per_blk);
if (lm->min_blk_line > lm->blk_per_line) {
pr_err("pblk: config. not supported. Min. LUN in line:%d\n",
lm->blk_per_line);
ret = -EINVAL;
goto fail;
}
ret = pblk_lines_alloc_metadata(pblk);
if (ret)
goto fail;
l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
if (!l_mg->bb_template) {
ret = -ENOMEM;
goto fail_free_meta;
}
l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
if (!l_mg->bb_aux) {
ret = -ENOMEM;
goto fail_free_bb_template;
}
bb_distance = (geo->nr_luns) * geo->sec_per_pl;
for (i = 0; i < lm->sec_per_line; i += bb_distance)
bitmap_set(l_mg->bb_template, i, geo->sec_per_pl);
INIT_LIST_HEAD(&l_mg->free_list);
INIT_LIST_HEAD(&l_mg->corrupt_list);
INIT_LIST_HEAD(&l_mg->bad_list);
INIT_LIST_HEAD(&l_mg->gc_full_list);
INIT_LIST_HEAD(&l_mg->gc_high_list);
INIT_LIST_HEAD(&l_mg->gc_mid_list);
INIT_LIST_HEAD(&l_mg->gc_low_list);
INIT_LIST_HEAD(&l_mg->gc_empty_list);
INIT_LIST_HEAD(&l_mg->emeta_list);
l_mg->gc_lists[0] = &l_mg->gc_high_list;
l_mg->gc_lists[1] = &l_mg->gc_mid_list;
l_mg->gc_lists[2] = &l_mg->gc_low_list;
spin_lock_init(&l_mg->free_lock);
spin_lock_init(&l_mg->close_lock);
spin_lock_init(&l_mg->gc_lock);
pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
GFP_KERNEL);
if (!pblk->lines) {
ret = -ENOMEM;
goto fail_free_bb_aux;
}
nr_free_blks = 0;
for (i = 0; i < l_mg->nr_lines; i++) {
int blk_in_line;
line = &pblk->lines[i];
line->pblk = pblk;
line->id = i;
line->type = PBLK_LINETYPE_FREE;
line->state = PBLK_LINESTATE_FREE;
line->gc_group = PBLK_LINEGC_NONE;
line->vsc = &l_mg->vsc_list[i];
spin_lock_init(&line->lock);
ret = pblk_alloc_line_bitmaps(pblk, line);
if (ret)
goto fail_free_lines;
nr_bad_blks = pblk_bb_line(pblk, line, lm->blk_per_line);
if (nr_bad_blks < 0 || nr_bad_blks > lm->blk_per_line) {
pblk_free_line_bitmaps(line);
ret = -EINVAL;
goto fail_free_lines;
}
blk_in_line = lm->blk_per_line - nr_bad_blks;
if (blk_in_line < lm->min_blk_line) {
line->state = PBLK_LINESTATE_BAD;
list_add_tail(&line->list, &l_mg->bad_list);
continue;
}
nr_free_blks += blk_in_line;
atomic_set(&line->blk_in_line, blk_in_line);
l_mg->nr_free_lines++;
list_add_tail(&line->list, &l_mg->free_list);
}
pblk_set_provision(pblk, nr_free_blks);
/* Cleanup per-LUN bad block lists - managed within lines on run-time */
for (i = 0; i < geo->nr_luns; i++)
kfree(pblk->luns[i].bb_list);
return 0;
fail_free_lines:
while (--i >= 0)
pblk_free_line_bitmaps(&pblk->lines[i]);
fail_free_bb_aux:
kfree(l_mg->bb_aux);
fail_free_bb_template:
kfree(l_mg->bb_template);
fail_free_meta:
pblk_line_meta_free(pblk);
fail:
for (i = 0; i < geo->nr_luns; i++)
kfree(pblk->luns[i].bb_list);
return ret;
}
static int pblk_writer_init(struct pblk *pblk)
{
setup_timer(&pblk->wtimer, pblk_write_timer_fn, (unsigned long)pblk);
mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
if (IS_ERR(pblk->writer_ts)) {
pr_err("pblk: could not allocate writer kthread\n");
return PTR_ERR(pblk->writer_ts);
}
return 0;
}
static void pblk_writer_stop(struct pblk *pblk)
{
/* The pipeline must be stopped and the write buffer emptied before the
* write thread is stopped
*/
WARN(pblk_rb_read_count(&pblk->rwb),
"Stopping not fully persisted write buffer\n");
WARN(pblk_rb_sync_count(&pblk->rwb),
"Stopping not fully synced write buffer\n");
if (pblk->writer_ts)
kthread_stop(pblk->writer_ts);
del_timer(&pblk->wtimer);
}
static void pblk_free(struct pblk *pblk)
{
pblk_luns_free(pblk);
pblk_lines_free(pblk);
pblk_line_meta_free(pblk);
pblk_core_free(pblk);
pblk_l2p_free(pblk);
kfree(pblk);
}
static void pblk_tear_down(struct pblk *pblk)
{
pblk_pipeline_stop(pblk);
pblk_writer_stop(pblk);
pblk_rb_sync_l2p(&pblk->rwb);
pblk_rwb_free(pblk);
pblk_rl_free(&pblk->rl);
pr_debug("pblk: consistent tear down\n");
}
static void pblk_exit(void *private)
{
struct pblk *pblk = private;
down_write(&pblk_lock);
pblk_gc_exit(pblk);
pblk_tear_down(pblk);
pblk_free(pblk);
up_write(&pblk_lock);
}
static sector_t pblk_capacity(void *private)
{
struct pblk *pblk = private;
return pblk->capacity * NR_PHY_IN_LOG;
}
static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
int flags)
{
struct nvm_geo *geo = &dev->geo;
struct request_queue *bqueue = dev->q;
struct request_queue *tqueue = tdisk->queue;
struct pblk *pblk;
int ret;
if (dev->identity.dom & NVM_RSP_L2P) {
pr_err("pblk: device-side L2P table not supported. (%x)\n",
dev->identity.dom);
return ERR_PTR(-EINVAL);
}
pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
if (!pblk)
return ERR_PTR(-ENOMEM);
pblk->dev = dev;
pblk->disk = tdisk;
pblk->state = PBLK_STATE_RUNNING;
spin_lock_init(&pblk->trans_lock);
spin_lock_init(&pblk->lock);
if (flags & NVM_TARGET_FACTORY)
pblk_setup_uuid(pblk);
#ifdef CONFIG_NVM_DEBUG
atomic_long_set(&pblk->inflight_writes, 0);
atomic_long_set(&pblk->padded_writes, 0);
atomic_long_set(&pblk->padded_wb, 0);
atomic_long_set(&pblk->nr_flush, 0);
atomic_long_set(&pblk->req_writes, 0);
atomic_long_set(&pblk->sub_writes, 0);
atomic_long_set(&pblk->sync_writes, 0);
atomic_long_set(&pblk->inflight_reads, 0);
atomic_long_set(&pblk->cache_reads, 0);
atomic_long_set(&pblk->sync_reads, 0);
atomic_long_set(&pblk->recov_writes, 0);
atomic_long_set(&pblk->recov_writes, 0);
atomic_long_set(&pblk->recov_gc_writes, 0);
#endif
atomic_long_set(&pblk->read_failed, 0);
atomic_long_set(&pblk->read_empty, 0);
atomic_long_set(&pblk->read_high_ecc, 0);
atomic_long_set(&pblk->read_failed_gc, 0);
atomic_long_set(&pblk->write_failed, 0);
atomic_long_set(&pblk->erase_failed, 0);
ret = pblk_luns_init(pblk, dev->luns);
if (ret) {
pr_err("pblk: could not initialize luns\n");
goto fail;
}
ret = pblk_lines_init(pblk);
if (ret) {
pr_err("pblk: could not initialize lines\n");
goto fail_free_luns;
}
ret = pblk_core_init(pblk);
if (ret) {
pr_err("pblk: could not initialize core\n");
goto fail_free_line_meta;
}
ret = pblk_l2p_init(pblk);
if (ret) {
pr_err("pblk: could not initialize maps\n");
goto fail_free_core;
}
ret = pblk_lines_configure(pblk, flags);
if (ret) {
pr_err("pblk: could not configure lines\n");
goto fail_free_l2p;
}
ret = pblk_writer_init(pblk);
if (ret) {
pr_err("pblk: could not initialize write thread\n");
goto fail_free_lines;
}
ret = pblk_gc_init(pblk);
if (ret) {
pr_err("pblk: could not initialize gc\n");
goto fail_stop_writer;
}
/* inherit the size from the underlying device */
blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue));
blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue));