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android / kernel / common / 56b68085e536eff2676108f2f8356889a7dbbf55 / . / drivers / lightnvm / pblk-init.c
blob: 5924f09c217b62f7849abcd8e0a08dc2158f2992 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* 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"
#include "pblk-trace.h"
static unsigned int write_buffer_size;
module_param(write_buffer_size, uint, 0644);
MODULE_PARM_DESC(write_buffer_size, "number of entries in a write buffer");
struct pblk_global_caches {
struct kmem_cache *ws;
struct kmem_cache *rec;
struct kmem_cache *g_rq;
struct kmem_cache *w_rq;
struct kref kref;
struct mutex mutex; /* Ensures consistency between
* caches and kref
*/
};
static struct pblk_global_caches pblk_caches = {
.mutex = __MUTEX_INITIALIZER(pblk_caches.mutex),
.kref = KREF_INIT(0),
};
struct bio_set pblk_bio_set;
static blk_qc_t pblk_submit_bio(struct bio *bio)
{
struct pblk *pblk = bio->bi_bdev->bd_disk->queue->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;
}
}
/* 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(&bio);
pblk_submit_read(pblk, bio);
} else {
/* 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(&bio);
pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
}
return BLK_QC_T_NONE;
}
static const struct block_device_operations pblk_bops = {
.owner = THIS_MODULE,
.submit_bio = pblk_submit_bio,
};
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->capacity;
}
#ifdef CONFIG_NVM_PBLK_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) {
guid_gen(&pblk->instance_uuid);
} else {
line = pblk_recov_l2p(pblk);
if (IS_ERR(line)) {
pblk_err(pblk, "could not recover l2p table\n");
return -EFAULT;
}
}
#ifdef CONFIG_NVM_PBLK_DEBUG
pblk_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)
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;
int ret = 0;
map_size = pblk_trans_map_size(pblk);
pblk->trans_map = __vmalloc(map_size, GFP_KERNEL | __GFP_NOWARN |
__GFP_RETRY_MAYFAIL | __GFP_HIGHMEM);
if (!pblk->trans_map) {
pblk_err(pblk, "failed to allocate L2P (need %zu of memory)\n",
map_size);
return -ENOMEM;
}
pblk_ppa_set_empty(&ppa);
for (i = 0; i < pblk->capacity; i++)
pblk_trans_map_set(pblk, i, ppa);
ret = pblk_l2p_recover(pblk, factory_init);
if (ret)
vfree(pblk->trans_map);
return ret;
}
static void pblk_rwb_free(struct pblk *pblk)
{
if (pblk_rb_tear_down_check(&pblk->rwb))
pblk_err(pblk, "write buffer error on tear down\n");
pblk_rb_free(&pblk->rwb);
}
static int pblk_rwb_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
unsigned long buffer_size;
int pgs_in_buffer, threshold;
threshold = geo->mw_cunits * geo->all_luns;
pgs_in_buffer = (max(geo->mw_cunits, geo->ws_opt) + geo->ws_opt)
* geo->all_luns;
if (write_buffer_size && (write_buffer_size > pgs_in_buffer))
buffer_size = write_buffer_size;
else
buffer_size = pgs_in_buffer;
return pblk_rb_init(&pblk->rwb, buffer_size, threshold, geo->csecs);
}
static int pblk_set_addrf_12(struct pblk *pblk, 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) {
pblk_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) {
pblk_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) {
pblk_err(pblk, "bad configuration of sectors/pages\n");
return -EINVAL;
}
pblk->addrf_len = pblk_set_addrf_12(pblk, 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:
pblk_err(pblk, "OCSSD revision not supported (%d)\n",
geo->version);
return -EINVAL;
}
return 0;
}
static int pblk_create_global_caches(void)
{
pblk_caches.ws = kmem_cache_create("pblk_blk_ws",
sizeof(struct pblk_line_ws), 0, 0, NULL);
if (!pblk_caches.ws)
return -ENOMEM;
pblk_caches.rec = kmem_cache_create("pblk_rec",
sizeof(struct pblk_rec_ctx), 0, 0, NULL);
if (!pblk_caches.rec)
goto fail_destroy_ws;
pblk_caches.g_rq = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
0, 0, NULL);
if (!pblk_caches.g_rq)
goto fail_destroy_rec;
pblk_caches.w_rq = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
0, 0, NULL);
if (!pblk_caches.w_rq)
goto fail_destroy_g_rq;
return 0;
fail_destroy_g_rq:
kmem_cache_destroy(pblk_caches.g_rq);
fail_destroy_rec:
kmem_cache_destroy(pblk_caches.rec);
fail_destroy_ws:
kmem_cache_destroy(pblk_caches.ws);
return -ENOMEM;
}
static int pblk_get_global_caches(void)
{
int ret = 0;
mutex_lock(&pblk_caches.mutex);
if (kref_get_unless_zero(&pblk_caches.kref))
goto out;
ret = pblk_create_global_caches();
if (!ret)
kref_init(&pblk_caches.kref);
out:
mutex_unlock(&pblk_caches.mutex);
return ret;
}
static void pblk_destroy_global_caches(struct kref *ref)
{
struct pblk_global_caches *c;
c = container_of(ref, struct pblk_global_caches, kref);
kmem_cache_destroy(c->ws);
kmem_cache_destroy(c->rec);
kmem_cache_destroy(c->g_rq);
kmem_cache_destroy(c->w_rq);
}
static void pblk_put_global_caches(void)
{
mutex_lock(&pblk_caches.mutex);
kref_put(&pblk_caches.kref, pblk_destroy_global_caches);
mutex_unlock(&pblk_caches.mutex);
}
static int pblk_core_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
int ret, 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->min_write_pgs = geo->ws_opt;
pblk->min_write_pgs_data = pblk->min_write_pgs;
max_write_ppas = pblk->min_write_pgs * geo->all_luns;
pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA);
pblk->max_write_pgs = min_t(int, pblk->max_write_pgs,
queue_max_hw_sectors(dev->q) / (geo->csecs >> SECTOR_SHIFT));
pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
pblk->oob_meta_size = geo->sos;
if (!pblk_is_oob_meta_supported(pblk)) {
/* For drives which does not have OOB metadata feature
* in order to support recovery feature we need to use
* so called packed metadata. Packed metada will store
* the same information as OOB metadata (l2p table mapping,
* but in the form of the single page at the end of
* every write request.
*/
if (pblk->min_write_pgs
* sizeof(struct pblk_sec_meta) > PAGE_SIZE) {
/* We want to keep all the packed metadata on single
* page per write requests. So we need to ensure that
* it will fit.
*
* This is more like sanity check, since there is
* no device with such a big minimal write size
* (above 1 metabytes).
*/
pblk_err(pblk, "Not supported min write size\n");
return -EINVAL;
}
/* For packed meta approach we do some simplification.
* On read path we always issue requests which size
* equal to max_write_pgs, with all pages filled with
* user payload except of last one page which will be
* filled with packed metadata.
*/
pblk->max_write_pgs = pblk->min_write_pgs;
pblk->min_write_pgs_data = pblk->min_write_pgs - 1;
}
pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t),
GFP_KERNEL);
if (!pblk->pad_dist)
return -ENOMEM;
if (pblk_get_global_caches())
goto fail_free_pad_dist;
/* Internal bios can be at most the sectors signaled by the device. */
ret = mempool_init_page_pool(&pblk->page_bio_pool, NVM_MAX_VLBA, 0);
if (ret)
goto free_global_caches;
ret = mempool_init_slab_pool(&pblk->gen_ws_pool, PBLK_GEN_WS_POOL_SIZE,
pblk_caches.ws);
if (ret)
goto free_page_bio_pool;
ret = mempool_init_slab_pool(&pblk->rec_pool, geo->all_luns,
pblk_caches.rec);
if (ret)
goto free_gen_ws_pool;
ret = mempool_init_slab_pool(&pblk->r_rq_pool, geo->all_luns,
pblk_caches.g_rq);
if (ret)
goto free_rec_pool;
ret = mempool_init_slab_pool(&pblk->e_rq_pool, geo->all_luns,
pblk_caches.g_rq);
if (ret)
goto free_r_rq_pool;
ret = mempool_init_slab_pool(&pblk->w_rq_pool, geo->all_luns,
pblk_caches.w_rq);
if (ret)
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);
INIT_LIST_HEAD(&pblk->resubmit_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_exit(&pblk->w_rq_pool);
free_e_rq_pool:
mempool_exit(&pblk->e_rq_pool);
free_r_rq_pool:
mempool_exit(&pblk->r_rq_pool);
free_rec_pool:
mempool_exit(&pblk->rec_pool);
free_gen_ws_pool:
mempool_exit(&pblk->gen_ws_pool);
free_page_bio_pool:
mempool_exit(&pblk->page_bio_pool);
free_global_caches:
pblk_put_global_caches();
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_exit(&pblk->page_bio_pool);
mempool_exit(&pblk->gen_ws_pool);
mempool_exit(&pblk->rec_pool);
mempool_exit(&pblk->r_rq_pool);
mempool_exit(&pblk->e_rq_pool);
mempool_exit(&pblk->w_rq_pool);
pblk_put_global_caches();
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]);
kvfree(l_mg->eline_meta[i]->buf);
kfree(l_mg->eline_meta[i]);
}
mempool_destroy(l_mg->bitmap_pool);
kmem_cache_destroy(l_mg->bitmap_cache);
}
static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
struct pblk_line *line)
{
struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
kfree(line->blk_bitmap);
kfree(line->erase_bitmap);
kfree(line->chks);
kvfree(w_err_gc->lba_list);
kfree(w_err_gc);
}
static void pblk_lines_free(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line *line;
int i;
for (i = 0; i < l_mg->nr_lines; i++) {
line = &pblk->lines[i];
pblk_line_free(line);
pblk_line_meta_free(l_mg, line);
}
pblk_line_mg_free(pblk);
kfree(pblk->luns);
kfree(pblk->lines);
}
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) {
pblk_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 int pblk_set_provision(struct pblk *pblk, int nr_free_chks)
{
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, clba;
int minimum;
if (geo->op == NVM_TARGET_DEFAULT_OP)
pblk->op = PBLK_DEFAULT_OP;
else
pblk->op = geo->op;
minimum = pblk_get_min_chks(pblk);
provisioned = nr_free_chks;
provisioned *= (100 - pblk->op);
sector_div(provisioned, 100);
if ((nr_free_chks - provisioned) < minimum) {
if (geo->op != NVM_TARGET_DEFAULT_OP) {
pblk_err(pblk, "OP too small to create a sane instance\n");
return -EINTR;
}
/* If the user did not specify an OP value, and PBLK_DEFAULT_OP
* is not enough, calculate and set sane value
*/
provisioned = nr_free_chks - minimum;
pblk->op = (100 * minimum) / nr_free_chks;
pblk_info(pblk, "Default OP insufficient, adjusting OP to %d\n",
pblk->op);
}
pblk->op_blks = nr_free_chks - provisioned;
/* Internally pblk manages all free blocks, but all calculations based
* on user capacity consider only provisioned blocks
*/
pblk->rl.total_blocks = nr_free_chks;
/* 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);
clba = (geo->clba / pblk->min_write_pgs) * pblk->min_write_pgs_data;
pblk->capacity = (provisioned - blk_meta) * clba;
atomic_set(&pblk->rl.free_blocks, nr_free_chks);
atomic_set(&pblk->rl.free_user_blocks, nr_free_chks);
return 0;
}
static int pblk_setup_line_meta_chk(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;
trace_pblk_chunk_state(pblk_disk_name(pblk), &ppa,
chunk->state);
if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
continue;
}
if (!(chunk->state & NVM_CHK_ST_OFFLINE))
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 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);
nr_bad_chks = pblk_setup_line_meta_chk(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)
goto free_blk_bitmap;
line->chks = kmalloc_array(lm->blk_per_line,
sizeof(struct nvm_chk_meta), GFP_KERNEL);
if (!line->chks)
goto free_erase_bitmap;
line->w_err_gc = kzalloc(sizeof(struct pblk_w_err_gc), GFP_KERNEL);
if (!line->w_err_gc)
goto free_chks;
return 0;
free_chks:
kfree(line->chks);
free_erase_bitmap:
kfree(line->erase_bitmap);
free_blk_bitmap:
kfree(line->blk_bitmap);
return -ENOMEM;
}
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->gc_werr_list);
INIT_LIST_HEAD(&l_mg->emeta_list);
l_mg->gc_lists[0] = &l_mg->gc_werr_list;
l_mg->gc_lists[1] = &l_mg->gc_high_list;
l_mg->gc_lists[2] = &l_mg->gc_mid_list;
l_mg->gc_lists[3] = &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;
}
l_mg->bitmap_cache = kmem_cache_create("pblk_lm_bitmap",
lm->sec_bitmap_len, 0, 0, NULL);
if (!l_mg->bitmap_cache)
goto fail_free_smeta;
/* the bitmap pool is used for both valid and map bitmaps */
l_mg->bitmap_pool = mempool_create_slab_pool(PBLK_DATA_LINES * 2,
l_mg->bitmap_cache);
if (!l_mg->bitmap_pool)
goto fail_destroy_bitmap_cache;
/* 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;
emeta->buf = kvmalloc(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) {
kvfree(l_mg->eline_meta[i]->buf);
kfree(l_mg->eline_meta[i]);
}
mempool_destroy(l_mg->bitmap_pool);
fail_destroy_bitmap_cache:
kmem_cache_destroy(l_mg->bitmap_cache);
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) {
pblk_err(pblk, "config. not supported. Min. LUN in line:%d\n",
lm->blk_per_line);
return -EINVAL;
}
return 0;
}
static int pblk_lines_init(struct pblk *pblk)
{
struct pblk_line_mgmt *l_mg = &pblk->l_mg;
struct pblk_line *line;
void *chunk_meta;
int nr_free_chks = 0;
int i, ret;
ret = pblk_line_meta_init(pblk);
if (ret)
return ret;
ret = pblk_line_mg_init(pblk);
if (ret)
return ret;
ret = pblk_luns_init(pblk);
if (ret)
goto fail_free_meta;
chunk_meta = pblk_get_chunk_meta(pblk);
if (IS_ERR(chunk_meta)) {
ret = PTR_ERR(chunk_meta);
goto fail_free_luns;
}
pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line),
GFP_KERNEL);
if (!pblk->lines) {
ret = -ENOMEM;
goto fail_free_chunk_meta;
}
for (i = 0; i < l_mg->nr_lines; i++) {
line = &pblk->lines[i];
ret = pblk_alloc_line_meta(pblk, line);
if (ret)
goto fail_free_lines;
nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
trace_pblk_line_state(pblk_disk_name(pblk), line->id,
line->state);
}
if (!nr_free_chks) {
pblk_err(pblk, "too many bad blocks prevent for sane instance\n");
ret = -EINTR;
goto fail_free_lines;
}
ret = pblk_set_provision(pblk, nr_free_chks);
if (ret)
goto fail_free_lines;
vfree(chunk_meta);
return 0;
fail_free_lines:
while (--i >= 0)
pblk_line_meta_free(l_mg, &pblk->lines[i]);
kfree(pblk->lines);
fail_free_chunk_meta:
vfree(chunk_meta);
fail_free_luns:
kfree(pblk->luns);
fail_free_meta:
pblk_line_mg_free(pblk);
return ret;
}
static int pblk_writer_init(struct pblk *pblk)
{
pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t");
if (IS_ERR(pblk->writer_ts)) {
int err = PTR_ERR(pblk->writer_ts);
if (err != -EINTR)
pblk_err(pblk, "could not allocate writer kthread (%d)\n",
err);
return err;
}
timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100));
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");
del_timer_sync(&pblk->wtimer);
if (pblk->writer_ts)
kthread_stop(pblk->writer_ts);
}
static void pblk_free(struct pblk *pblk)
{
pblk_lines_free(pblk);
pblk_l2p_free(pblk);
pblk_rwb_free(pblk);
pblk_core_free(pblk);
kfree(pblk);
}
static void pblk_tear_down(struct pblk *pblk, bool graceful)
{
if (graceful)
__pblk_pipeline_flush(pblk);
__pblk_pipeline_stop(pblk);
pblk_writer_stop(pblk);
pblk_rb_sync_l2p(&pblk->rwb);
pblk_rl_free(&pblk->rl);
pblk_debug(pblk, "consistent tear down (graceful:%d)\n", graceful);
}
static void pblk_exit(void *private, bool graceful)
{
struct pblk *pblk = private;
pblk_gc_exit(pblk, graceful);
pblk_tear_down(pblk, graceful);
#ifdef CONFIG_NVM_PBLK_DEBUG
pblk_info(pblk, "exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
#endif
pblk_free(pblk);
}
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;
pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL);
if (!pblk)
return ERR_PTR(-ENOMEM);
pblk->dev = dev;
pblk->disk = tdisk;
pblk->state = PBLK_STATE_RUNNING;
trace_pblk_state(pblk_disk_name(pblk), pblk->state);
pblk->gc.gc_enabled = 0;
if (!(geo->version == NVM_OCSSD_SPEC_12 ||
geo->version == NVM_OCSSD_SPEC_20)) {
pblk_err(pblk, "OCSSD version not supported (%u)\n",
geo->version);
kfree(pblk);
return ERR_PTR(-EINVAL);
}
if (geo->ext) {
pblk_err(pblk, "extended metadata not supported\n");
kfree(pblk);
return ERR_PTR(-EINVAL);
}
spin_lock_init(&pblk->resubmit_lock);
spin_lock_init(&pblk->trans_lock);
spin_lock_init(&pblk->lock);
#ifdef CONFIG_NVM_PBLK_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->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);
atomic_long_set(&pblk->recov_gc_reads, 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_core_init(pblk);
if (ret) {
pblk_err(pblk, "could not initialize core\n");
goto fail;
}
ret = pblk_lines_init(pblk);
if (ret) {
pblk_err(pblk, "could not initialize lines\n");
goto fail_free_core;
}
ret = pblk_rwb_init(pblk);
if (ret) {
pblk_err(pblk, "could not initialize write buffer\n");
goto fail_free_lines;
}
ret = pblk_l2p_init(pblk, flags & NVM_TARGET_FACTORY);
if (ret) {
pblk_err(pblk, "could not initialize maps\n");
goto fail_free_rwb;
}
ret = pblk_writer_init(pblk);
if (ret) {
if (ret != -EINTR)
pblk_err(pblk, "could not initialize write thread\n");
goto fail_free_l2p;
}
ret = pblk_gc_init(pblk);
if (ret) {
pblk_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));
blk_queue_write_cache(tqueue, true, false);
tqueue->limits.discard_granularity = geo->clba * geo->csecs;
tqueue->limits.discard_alignment = 0;
blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, tqueue);
pblk_info(pblk, "luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
geo->all_luns, pblk->l_mg.nr_lines,
(unsigned long long)pblk->capacity,
pblk->rwb.nr_entries);
wake_up_process(pblk->writer_ts);
/* Check if we need to start GC */
pblk_gc_should_kick(pblk);
return pblk;
fail_stop_writer:
pblk_writer_stop(pblk);
fail_free_l2p:
pblk_l2p_free(pblk);
fail_free_rwb:
pblk_rwb_free(pblk);
fail_free_lines:
pblk_lines_free(pblk);
fail_free_core:
pblk_core_free(pblk);
fail:
kfree(pblk);
return ERR_PTR(ret);
}
/* physical block device target */
static struct nvm_tgt_type tt_pblk = {
.name = "pblk",
.version = {1, 0, 0},
.bops = &pblk_bops,
.capacity = pblk_capacity,
.init = pblk_init,
.exit = pblk_exit,
.sysfs_init = pblk_sysfs_init,
.sysfs_exit = pblk_sysfs_exit,
.owner = THIS_MODULE,
};
static int __init pblk_module_init(void)
{
int ret;
ret = bioset_init(&pblk_bio_set, BIO_POOL_SIZE, 0, 0);
if (ret)
return ret;
ret = nvm_register_tgt_type(&tt_pblk);
if (ret)
bioset_exit(&pblk_bio_set);
return ret;
}
static void pblk_module_exit(void)
{
bioset_exit(&pblk_bio_set);
nvm_unregister_tgt_type(&tt_pblk);
}
module_init(pblk_module_init);
module_exit(pblk_module_exit);
MODULE_AUTHOR("Javier Gonzalez <[email protected]>");
MODULE_AUTHOR("Matias Bjorling <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");