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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 <[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.
*
* 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_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
*pblk_w_rq_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 (pblk_get_secs(bio) > pblk_rl_max_io(&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 size_t pblk_trans_map_size(struct pblk *pblk)
{
int entry_size = 8;
if (pblk->addrf_len < 32)
entry_size = 4;
return entry_size * pblk->rl.nr_secs;
}
#ifdef CONFIG_NVM_DEBUG
static u32 pblk_l2p_crc(struct pblk *pblk)
{
size_t map_size;
u32 crc = ~(u32)0;
map_size = pblk_trans_map_size(pblk);
crc = crc32_le(crc, pblk->trans_map, map_size);
return crc;
}
#endif
static void pblk_l2p_free(struct pblk *pblk)
{
vfree(pblk->trans_map);
}
static int pblk_l2p_recover(struct pblk *pblk, bool factory_init)
{
struct pblk_line *line = NULL;
if (factory_init) {
pblk_setup_uuid(pblk);
} else {
line = pblk_recov_l2p(pblk);
if (IS_ERR(line)) {
pr_err("pblk: could not recover l2p table\n");
return -EFAULT;
}
}
#ifdef CONFIG_NVM_DEBUG
pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk));
#endif
/* Free full lines directly as GC has not been started yet */
pblk_gc_free_full_lines(pblk);
if (!line) {
/* Configure next line for user data */
line = pblk_line_get_first_data(pblk);
if (!line) {
pr_err("pblk: line list corrupted\n");
return -EFAULT;
}
}
return 0;
}
static int pblk_l2p_init(struct pblk *pblk, bool factory_init)
{
sector_t i;
struct ppa_addr ppa;
size_t map_size;
map_size = pblk_trans_map_size(pblk);
pblk->trans_map = vmalloc(map_size);
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 pblk_l2p_recover(pblk, factory_init);
}
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->csecs);
return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
}
/* Minimum pages needed within a lun */
#define ADDR_POOL_SIZE 64
static int pblk_set_addrf_12(struct nvm_geo *geo, struct nvm_addrf_12 *dst)
{
struct nvm_addrf_12 *src = (struct nvm_addrf_12 *)&geo->addrf;
int power_len;
/* Re-calculate channel and lun format to adapt to configuration */
power_len = get_count_order(geo->num_ch);
if (1 << power_len != geo->num_ch) {
pr_err("pblk: supports only power-of-two channel config.\n");
return -EINVAL;
}
dst->ch_len = power_len;
power_len = get_count_order(geo->num_lun);
if (1 << power_len != geo->num_lun) {
pr_err("pblk: supports only power-of-two LUN config.\n");
return -EINVAL;
}
dst->lun_len = power_len;
dst->blk_len = src->blk_len;
dst->pg_len = src->pg_len;
dst->pln_len = src->pln_len;
dst->sec_len = src->sec_len;
dst->sec_offset = 0;
dst->pln_offset = dst->sec_len;
dst->ch_offset = dst->pln_offset + dst->pln_len;
dst->lun_offset = dst->ch_offset + dst->ch_len;
dst->pg_offset = dst->lun_offset + dst->lun_len;
dst->blk_offset = dst->pg_offset + dst->pg_len;
dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;
return dst->blk_offset + src->blk_len;
}
static int pblk_set_addrf_20(struct nvm_geo *geo, struct nvm_addrf *adst,
struct pblk_addrf *udst)
{
struct nvm_addrf *src = &geo->addrf;
adst->ch_len = get_count_order(geo->num_ch);
adst->lun_len = get_count_order(geo->num_lun);
adst->chk_len = src->chk_len;
adst->sec_len = src->sec_len;
adst->sec_offset = 0;
adst->ch_offset = adst->sec_len;
adst->lun_offset = adst->ch_offset + adst->ch_len;
adst->chk_offset = adst->lun_offset + adst->lun_len;
adst->sec_mask = ((1ULL << adst->sec_len) - 1) << adst->sec_offset;
adst->chk_mask = ((1ULL << adst->chk_len) - 1) << adst->chk_offset;
adst->lun_mask = ((1ULL << adst->lun_len) - 1) << adst->lun_offset;
adst->ch_mask = ((1ULL << adst->ch_len) - 1) << adst->ch_offset;
udst->sec_stripe = geo->ws_opt;
udst->ch_stripe = geo->num_ch;
udst->lun_stripe = geo->num_lun;
udst->sec_lun_stripe = udst->sec_stripe * udst->ch_stripe;
udst->sec_ws_stripe = udst->sec_lun_stripe * udst->lun_stripe;
return adst->chk_offset + adst->chk_len;
}
static int pblk_set_addrf(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int mod;
switch (geo->version) {
case NVM_OCSSD_SPEC_12:
div_u64_rem(geo->clba, pblk->min_write_pgs, &mod);
if (mod) {
pr_err("pblk: bad configuration of sectors/pages\n");
return -EINVAL;
}
pblk->addrf_len = pblk_set_addrf_12(geo, (void *)&pblk->addrf);
break;
case NVM_OCSSD_SPEC_20:
pblk->addrf_len = pblk_set_addrf_20(geo, (void *)&pblk->addrf,
&pblk->uaddrf);
break;
default:
pr_err("pblk: OCSSD revision not supported (%d)\n",
geo->version);
return -EINVAL;
}
return 0;
}
static int pblk_init_global_caches(struct pblk *pblk)
{
down_write(&pblk_lock);
pblk_ws_cache = kmem_cache_create("pblk_blk_ws",
sizeof(struct pblk_line_ws), 0, 0, NULL);
if (!pblk_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_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_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_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
kmem_cache_destroy(pblk_g_rq_cache);
up_write(&pblk_lock);
return -ENOMEM;
}
up_write(&pblk_lock);
return 0;
}
static void pblk_free_global_caches(struct pblk *pblk)
{
kmem_cache_destroy(pblk_ws_cache);
kmem_cache_destroy(pblk_rec_cache);
kmem_cache_destroy(pblk_g_rq_cache);
kmem_cache_destroy(pblk_w_rq_cache);
}
static int pblk_core_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int max_write_ppas;
atomic64_set(&pblk->user_wa, 0);
atomic64_set(&pblk->pad_wa, 0);
atomic64_set(&pblk->gc_wa, 0);
pblk->user_rst_wa = 0;
pblk->pad_rst_wa = 0;
pblk->gc_rst_wa = 0;
atomic64_set(&pblk->nr_flush, 0);
pblk->nr_flush_rst = 0;
pblk->pgs_in_buffer = geo->mw_cunits * geo->all_luns;
pblk->min_write_pgs = geo->ws_opt * (geo->csecs / PAGE_SIZE);
max_write_ppas = pblk->min_write_pgs * geo->all_luns;
pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
pr_err("pblk: vector list too big(%u > %u)\n",
pblk->max_write_pgs, PBLK_MAX_REQ_ADDRS);
return -EINVAL;
}
pblk->pad_dist = kzalloc((pblk->min_write_pgs - 1) * sizeof(atomic64_t),
GFP_KERNEL);
if (!pblk->pad_dist)
return -ENOMEM;
if (pblk_init_global_caches(pblk))
goto fail_free_pad_dist;
/* Internal bios can be at most the sectors signaled by the device. */
pblk->page_bio_pool = mempool_create_page_pool(NVM_MAX_VLBA, 0);
if (!pblk->page_bio_pool)
goto free_global_caches;
pblk->gen_ws_pool = mempool_create_slab_pool(PBLK_GEN_WS_POOL_SIZE,
pblk_ws_cache);
if (!pblk->gen_ws_pool)
goto free_page_bio_pool;
pblk->rec_pool = mempool_create_slab_pool(geo->all_luns,
pblk_rec_cache);
if (!pblk->rec_pool)
goto free_gen_ws_pool;
pblk->r_rq_pool = mempool_create_slab_pool(geo->all_luns,
pblk_g_rq_cache);
if (!pblk->r_rq_pool)
goto free_rec_pool;
pblk->e_rq_pool = mempool_create_slab_pool(geo->all_luns,
pblk_g_rq_cache);
if (!pblk->e_rq_pool)
goto free_r_rq_pool;
pblk->w_rq_pool = mempool_create_slab_pool(geo->all_luns,
pblk_w_rq_cache);
if (!pblk->w_rq_pool)
goto free_e_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_w_rq_pool;
pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
if (!pblk->bb_wq)
goto free_close_wq;
pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
if (!pblk->r_end_wq)
goto free_bb_wq;
if (pblk_set_addrf(pblk))
goto free_r_end_wq;
INIT_LIST_HEAD(&pblk->compl_list);
return 0;
free_r_end_wq:
destroy_workqueue(pblk->r_end_wq);
free_bb_wq:
destroy_workqueue(pblk->bb_wq);
free_close_wq:
destroy_workqueue(pblk->close_wq);
free_w_rq_pool:
mempool_destroy(pblk->w_rq_pool);
free_e_rq_pool:
mempool_destroy(pblk->e_rq_pool);
free_r_rq_pool:
mempool_destroy(pblk->r_rq_pool);
free_rec_pool:
mempool_destroy(pblk->rec_pool);
free_gen_ws_pool:
mempool_destroy(pblk->gen_ws_pool);
free_page_bio_pool:
mempool_destroy(pblk->page_bio_pool);
free_global_caches:
pblk_free_global_caches(pblk);
fail_free_pad_dist:
kfree(pblk->pad_dist);
return -ENOMEM;
}
static void pblk_core_free(struct pblk *pblk)
{
if (pblk->close_wq)
destroy_workqueue(pblk->close_wq);
if (pblk->r_end_wq)
destroy_workqueue(pblk->r_end_wq);
if (pblk->bb_wq)
destroy_workqueue(pblk->bb_wq);
mempool_destroy(pblk->page_bio_pool);
mempool_destroy(pblk->gen_ws_pool);
mempool_destroy(pblk->rec_pool);
mempool_destroy(pblk->r_rq_pool);
mempool_destroy(pblk->e_rq_pool);
mempool_destroy(pblk->w_rq_pool);
pblk_free_global_caches(pblk);
kfree(pblk->pad_dist);
}
static void pblk_line_mg_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);
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]);
}
}
static void pblk_line_meta_free(struct pblk_line *line)
{
kfree(line->blk_bitmap);
kfree(line->erase_bitmap);
kfree(line->chks);
}
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_line_meta_free(line);
}
spin_unlock(&l_mg->free_lock);
pblk_line_mg_free(pblk);
kfree(pblk->luns);
kfree(pblk->lines);
}
static int pblk_bb_get_tbl(struct nvm_tgt_dev *dev, struct pblk_lun *rlun,
u8 *blks, int nr_blks)
{
struct ppa_addr ppa;
int ret;
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)
return ret;
nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
if (nr_blks < 0)
return -EIO;
return 0;
}
static void *pblk_bb_get_meta(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
u8 *meta;
int i, nr_blks, blk_per_lun;
int ret;
blk_per_lun = geo->num_chk * geo->pln_mode;
nr_blks = blk_per_lun * geo->all_luns;
meta = kmalloc(nr_blks, GFP_KERNEL);
if (!meta)
return ERR_PTR(-ENOMEM);
for (i = 0; i < geo->all_luns; i++) {
struct pblk_lun *rlun = &pblk->luns[i];
u8 *meta_pos = meta + i * blk_per_lun;
ret = pblk_bb_get_tbl(dev, rlun, meta_pos, blk_per_lun);
if (ret) {
kfree(meta);
return ERR_PTR(-EIO);
}
}
return meta;
}
static void *pblk_chunk_get_meta(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
if (geo->version == NVM_OCSSD_SPEC_12)
return pblk_bb_get_meta(pblk);
else
return pblk_chunk_get_info(pblk);
}
static int pblk_luns_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_lun *rlun;
int i;
/* TODO: Implement unbalanced LUN support */
if (geo->num_lun < 0) {
pr_err("pblk: unbalanced LUN config.\n");
return -EINVAL;
}
pblk->luns = kcalloc(geo->all_luns, sizeof(struct pblk_lun),
GFP_KERNEL);
if (!pblk->luns)
return -ENOMEM;
for (i = 0; i < geo->all_luns; i++) {
/* Stripe across channels */
int ch = i % geo->num_ch;
int lun_raw = i / geo->num_ch;
int lunid = lun_raw + ch * geo->num_lun;
rlun = &pblk->luns[i];
rlun->bppa = dev->luns[lunid];
sema_init(&rlun->wr_sem, 1);
}
return 0;
}
/* 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 +
sizeof(struct wa_counters), geo->csecs);
lm->emeta_len[1] = lm->emeta_sec[1] * geo->csecs;
/* 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->csecs);
lm->emeta_len[2] = lm->emeta_sec[2] * geo->csecs;
lm->emeta_sec[3] = DIV_ROUND_UP(l_mg->nr_lines * sizeof(u32),
geo->csecs);
lm->emeta_len[3] = lm->emeta_sec[3] * geo->csecs;
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 pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line_meta *lm = &pblk->lm;
struct nvm_geo *geo = &dev->geo;
sector_t provisioned;
int sec_meta, blk_meta;
if (geo->op == NVM_TARGET_DEFAULT_OP)
pblk->op = PBLK_DEFAULT_OP;
else
pblk->op = geo->op;
provisioned = nr_free_blks;
provisioned *= (100 - pblk->op);
sector_div(provisioned, 100);
pblk->op_blks = nr_free_blks - provisioned;
/* 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->clba;
/* Consider sectors used for metadata */
sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);
pblk->capacity = (provisioned - blk_meta) * geo->clba;
atomic_set(&pblk->rl.free_blocks, nr_free_blks);
atomic_set(&pblk->rl.free_user_blocks, nr_free_blks);
}
static int pblk_setup_line_meta_12(struct pblk *pblk, struct pblk_line *line,
void *chunk_meta)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_line_meta *lm = &pblk->lm;
int i, chk_per_lun, nr_bad_chks = 0;
chk_per_lun = geo->num_chk * geo->pln_mode;
for (i = 0; i < lm->blk_per_line; i++) {
struct pblk_lun *rlun = &pblk->luns[i];
struct nvm_chk_meta *chunk;
int pos = pblk_ppa_to_pos(geo, rlun->bppa);
u8 *lun_bb_meta = chunk_meta + pos * chk_per_lun;
chunk = &line->chks[pos];
/*
* In 1.2 spec. chunk state is not persisted by the device. Thus
* some of the values are reset each time pblk is instantiated.
*/
if (lun_bb_meta[line->id] == NVM_BLK_T_FREE)
chunk->state = NVM_CHK_ST_FREE;
else
chunk->state = NVM_CHK_ST_OFFLINE;
chunk->type = NVM_CHK_TP_W_SEQ;
chunk->wi = 0;
chunk->slba = -1;
chunk->cnlb = geo->clba;
chunk->wp = 0;
if (!(chunk->state & NVM_CHK_ST_OFFLINE))
continue;
set_bit(pos, line->blk_bitmap);
nr_bad_chks++;
}
return nr_bad_chks;
}
static int pblk_setup_line_meta_20(struct pblk *pblk, struct pblk_line *line,
struct nvm_chk_meta *meta)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_line_meta *lm = &pblk->lm;
int i, nr_bad_chks = 0;
for (i = 0; i < lm->blk_per_line; i++) {
struct pblk_lun *rlun = &pblk->luns[i];
struct nvm_chk_meta *chunk;
struct nvm_chk_meta *chunk_meta;
struct ppa_addr ppa;
int pos;
ppa = rlun->bppa;
pos = pblk_ppa_to_pos(geo, ppa);
chunk = &line->chks[pos];
ppa.m.chk = line->id;
chunk_meta = pblk_chunk_get_off(pblk, meta, ppa);
chunk->state = chunk_meta->state;
chunk->type = chunk_meta->type;
chunk->wi = chunk_meta->wi;
chunk->slba = chunk_meta->slba;
chunk->cnlb = chunk_meta->cnlb;
chunk->wp = chunk_meta->wp;
if (!(chunk->state & NVM_CHK_ST_OFFLINE))
continue;
if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
continue;
}
set_bit(pos, line->blk_bitmap);
nr_bad_chks++;
}
return nr_bad_chks;
}
static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
void *chunk_meta, int line_id)
{
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;
long nr_bad_chks, chk_in_line;
line->pblk = pblk;
line->id = line_id;
line->type = PBLK_LINETYPE_FREE;
line->state = PBLK_LINESTATE_NEW;
line->gc_group = PBLK_LINEGC_NONE;
line->vsc = &l_mg->vsc_list[line_id];
spin_lock_init(&line->lock);
if (geo->version == NVM_OCSSD_SPEC_12)
nr_bad_chks = pblk_setup_line_meta_12(pblk, line, chunk_meta);
else
nr_bad_chks = pblk_setup_line_meta_20(pblk, line, chunk_meta);
chk_in_line = lm->blk_per_line - nr_bad_chks;
if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
chk_in_line < lm->min_blk_line) {
line->state = PBLK_LINESTATE_BAD;
list_add_tail(&line->list, &l_mg->bad_list);
return 0;
}
atomic_set(&line->blk_in_line, chk_in_line);
list_add_tail(&line->list, &l_mg->free_list);
l_mg->nr_free_lines++;
return chk_in_line;
}
static int pblk_alloc_line_meta(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;
}
line->chks = kmalloc(lm->blk_per_line * sizeof(struct nvm_chk_meta),
GFP_KERNEL);
if (!line->chks) {
kfree(line->erase_bitmap);
kfree(line->blk_bitmap);
return -ENOMEM;
}
return 0;
}
static int pblk_line_mg_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;
int i, bb_distance;
l_mg->nr_lines = geo->num_chk;
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);
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);
l_mg->vsc_list = kcalloc(l_mg->nr_lines, sizeof(__le32), GFP_KERNEL);
if (!l_mg->vsc_list)
goto fail;
l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
if (!l_mg->bb_template)
goto fail_free_vsc_list;
l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL);
if (!l_mg->bb_aux)
goto fail_free_bb_template;
/* 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;
}
}
for (i = 0; i < l_mg->nr_lines; i++)
l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
bb_distance = (geo->all_luns) * geo->ws_opt;
for (i = 0; i < lm->sec_per_line; i += bb_distance)
bitmap_set(l_mg->bb_template, i, geo->ws_opt);
return 0;
fail_free_emeta:
while (--i >= 0) {
if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
vfree(l_mg->eline_meta[i]->buf);
else
kfree(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]);
kfree(l_mg->bb_aux);
fail_free_bb_template:
kfree(l_mg->bb_template);
fail_free_vsc_list:
kfree(l_mg->vsc_list);
fail:
return -ENOMEM;
}
static int pblk_line_meta_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_line_meta *lm = &pblk->lm;
unsigned int smeta_len, emeta_len;
int i;
lm->sec_per_line = geo->clba * geo->all_luns;
lm->blk_per_line = geo->all_luns;
lm->blk_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
lm->lun_bitmap_len = BITS_TO_LONGS(geo->all_luns) * sizeof(long);
lm->mid_thrs = lm->sec_per_line / 2;
lm->high_thrs = lm->sec_per_line / 4;
lm->meta_distance = (geo->all_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->ws_opt;
lm->smeta_len = lm->smeta_sec * geo->csecs;
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->ws_opt;
lm->emeta_len[0] = lm->emeta_sec[0] * geo->csecs;
emeta_len = calc_emeta_len(pblk);
if (emeta_len > lm->emeta_len[0]) {
i++;
goto add_emeta_page;
}
lm->emeta_bb = geo->all_luns > i ? geo->all_luns - i : 0;
lm->min_blk_line = 1;
if (geo->all_luns > 1)
lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec +
lm->emeta_sec[0], geo->clba);
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);