![Kees Cook](/assets/img/avatar_default.png)
In preparation for unconditionally passing the struct timer_list pointer to all timer callbacks, switch to using the new timer_setup() and from_timer() to pass the timer pointer explicitly. Cc: Matias Bjorling <mb@lightnvm.io> Cc: linux-block@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>
1119 lines
27 KiB
C
1119 lines
27 KiB
C
/*
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* Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
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* Copyright (C) 2016 CNEX Labs
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* Initial release: Javier Gonzalez <javier@cnexlabs.com>
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* Matias Bjorling <matias@cnexlabs.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Implementation of a physical block-device target for Open-channel SSDs.
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*
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* pblk-init.c - pblk's initialization.
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*/
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#include "pblk.h"
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static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
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*pblk_w_rq_cache;
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static DECLARE_RWSEM(pblk_lock);
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struct bio_set *pblk_bio_set;
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static int pblk_rw_io(struct request_queue *q, struct pblk *pblk,
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struct bio *bio)
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{
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int ret;
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/* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap
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* constraint. Writes can be of arbitrary size.
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*/
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if (bio_data_dir(bio) == READ) {
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blk_queue_split(q, &bio);
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ret = pblk_submit_read(pblk, bio);
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if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED))
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bio_put(bio);
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return ret;
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}
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/* Prevent deadlock in the case of a modest LUN configuration and large
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* user I/Os. Unless stalled, the rate limiter leaves at least 256KB
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* available for user I/O.
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*/
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if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl))
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blk_queue_split(q, &bio);
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return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER);
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}
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static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio)
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{
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struct pblk *pblk = q->queuedata;
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if (bio_op(bio) == REQ_OP_DISCARD) {
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pblk_discard(pblk, bio);
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if (!(bio->bi_opf & REQ_PREFLUSH)) {
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bio_endio(bio);
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return BLK_QC_T_NONE;
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}
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}
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switch (pblk_rw_io(q, pblk, bio)) {
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case NVM_IO_ERR:
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bio_io_error(bio);
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break;
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case NVM_IO_DONE:
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bio_endio(bio);
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break;
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}
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return BLK_QC_T_NONE;
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}
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static size_t pblk_trans_map_size(struct pblk *pblk)
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{
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int entry_size = 8;
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if (pblk->ppaf_bitsize < 32)
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entry_size = 4;
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return entry_size * pblk->rl.nr_secs;
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}
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#ifdef CONFIG_NVM_DEBUG
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static u32 pblk_l2p_crc(struct pblk *pblk)
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{
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size_t map_size;
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u32 crc = ~(u32)0;
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map_size = pblk_trans_map_size(pblk);
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crc = crc32_le(crc, pblk->trans_map, map_size);
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return crc;
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}
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#endif
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static void pblk_l2p_free(struct pblk *pblk)
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{
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vfree(pblk->trans_map);
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}
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static int pblk_l2p_init(struct pblk *pblk)
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{
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sector_t i;
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struct ppa_addr ppa;
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size_t map_size;
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map_size = pblk_trans_map_size(pblk);
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pblk->trans_map = vmalloc(map_size);
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if (!pblk->trans_map)
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return -ENOMEM;
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pblk_ppa_set_empty(&ppa);
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for (i = 0; i < pblk->rl.nr_secs; i++)
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pblk_trans_map_set(pblk, i, ppa);
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return 0;
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}
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static void pblk_rwb_free(struct pblk *pblk)
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{
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if (pblk_rb_tear_down_check(&pblk->rwb))
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pr_err("pblk: write buffer error on tear down\n");
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pblk_rb_data_free(&pblk->rwb);
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vfree(pblk_rb_entries_ref(&pblk->rwb));
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}
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static int pblk_rwb_init(struct pblk *pblk)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct pblk_rb_entry *entries;
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unsigned long nr_entries;
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unsigned int power_size, power_seg_sz;
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nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer);
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entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry));
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if (!entries)
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return -ENOMEM;
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power_size = get_count_order(nr_entries);
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power_seg_sz = get_count_order(geo->sec_size);
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return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz);
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}
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/* Minimum pages needed within a lun */
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#define ADDR_POOL_SIZE 64
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static int pblk_set_ppaf(struct pblk *pblk)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct nvm_addr_format ppaf = geo->ppaf;
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int power_len;
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/* Re-calculate channel and lun format to adapt to configuration */
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power_len = get_count_order(geo->nr_chnls);
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if (1 << power_len != geo->nr_chnls) {
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pr_err("pblk: supports only power-of-two channel config.\n");
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return -EINVAL;
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}
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ppaf.ch_len = power_len;
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power_len = get_count_order(geo->luns_per_chnl);
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if (1 << power_len != geo->luns_per_chnl) {
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pr_err("pblk: supports only power-of-two LUN config.\n");
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return -EINVAL;
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}
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ppaf.lun_len = power_len;
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pblk->ppaf.sec_offset = 0;
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pblk->ppaf.pln_offset = ppaf.sect_len;
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pblk->ppaf.ch_offset = pblk->ppaf.pln_offset + ppaf.pln_len;
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pblk->ppaf.lun_offset = pblk->ppaf.ch_offset + ppaf.ch_len;
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pblk->ppaf.pg_offset = pblk->ppaf.lun_offset + ppaf.lun_len;
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pblk->ppaf.blk_offset = pblk->ppaf.pg_offset + ppaf.pg_len;
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pblk->ppaf.sec_mask = (1ULL << ppaf.sect_len) - 1;
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pblk->ppaf.pln_mask = ((1ULL << ppaf.pln_len) - 1) <<
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pblk->ppaf.pln_offset;
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pblk->ppaf.ch_mask = ((1ULL << ppaf.ch_len) - 1) <<
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pblk->ppaf.ch_offset;
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pblk->ppaf.lun_mask = ((1ULL << ppaf.lun_len) - 1) <<
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pblk->ppaf.lun_offset;
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pblk->ppaf.pg_mask = ((1ULL << ppaf.pg_len) - 1) <<
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pblk->ppaf.pg_offset;
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pblk->ppaf.blk_mask = ((1ULL << ppaf.blk_len) - 1) <<
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pblk->ppaf.blk_offset;
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pblk->ppaf_bitsize = pblk->ppaf.blk_offset + ppaf.blk_len;
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return 0;
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}
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static int pblk_init_global_caches(struct pblk *pblk)
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{
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down_write(&pblk_lock);
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pblk_ws_cache = kmem_cache_create("pblk_blk_ws",
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sizeof(struct pblk_line_ws), 0, 0, NULL);
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if (!pblk_ws_cache) {
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up_write(&pblk_lock);
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return -ENOMEM;
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}
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pblk_rec_cache = kmem_cache_create("pblk_rec",
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sizeof(struct pblk_rec_ctx), 0, 0, NULL);
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if (!pblk_rec_cache) {
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kmem_cache_destroy(pblk_ws_cache);
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up_write(&pblk_lock);
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return -ENOMEM;
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}
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pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size,
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0, 0, NULL);
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if (!pblk_g_rq_cache) {
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kmem_cache_destroy(pblk_ws_cache);
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kmem_cache_destroy(pblk_rec_cache);
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up_write(&pblk_lock);
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return -ENOMEM;
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}
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pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size,
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0, 0, NULL);
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if (!pblk_w_rq_cache) {
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kmem_cache_destroy(pblk_ws_cache);
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kmem_cache_destroy(pblk_rec_cache);
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kmem_cache_destroy(pblk_g_rq_cache);
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up_write(&pblk_lock);
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return -ENOMEM;
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}
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up_write(&pblk_lock);
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return 0;
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}
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static void pblk_free_global_caches(struct pblk *pblk)
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{
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kmem_cache_destroy(pblk_ws_cache);
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kmem_cache_destroy(pblk_rec_cache);
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kmem_cache_destroy(pblk_g_rq_cache);
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kmem_cache_destroy(pblk_w_rq_cache);
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}
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static int pblk_core_init(struct pblk *pblk)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg *
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geo->nr_planes * geo->nr_luns;
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if (pblk_init_global_caches(pblk))
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return -ENOMEM;
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/* Internal bios can be at most the sectors signaled by the device. */
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pblk->page_bio_pool = mempool_create_page_pool(nvm_max_phys_sects(dev),
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0);
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if (!pblk->page_bio_pool)
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goto free_global_caches;
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pblk->gen_ws_pool = mempool_create_slab_pool(PBLK_GEN_WS_POOL_SIZE,
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pblk_ws_cache);
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if (!pblk->gen_ws_pool)
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goto free_page_bio_pool;
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pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache);
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if (!pblk->rec_pool)
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goto free_gen_ws_pool;
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pblk->r_rq_pool = mempool_create_slab_pool(geo->nr_luns,
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pblk_g_rq_cache);
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if (!pblk->r_rq_pool)
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goto free_rec_pool;
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pblk->e_rq_pool = mempool_create_slab_pool(geo->nr_luns,
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pblk_g_rq_cache);
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if (!pblk->e_rq_pool)
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goto free_r_rq_pool;
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pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns,
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pblk_w_rq_cache);
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if (!pblk->w_rq_pool)
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goto free_e_rq_pool;
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pblk->close_wq = alloc_workqueue("pblk-close-wq",
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WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS);
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if (!pblk->close_wq)
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goto free_w_rq_pool;
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pblk->bb_wq = alloc_workqueue("pblk-bb-wq",
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WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
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if (!pblk->bb_wq)
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goto free_close_wq;
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pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq",
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WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
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if (!pblk->r_end_wq)
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goto free_bb_wq;
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if (pblk_set_ppaf(pblk))
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goto free_r_end_wq;
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if (pblk_rwb_init(pblk))
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goto free_r_end_wq;
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INIT_LIST_HEAD(&pblk->compl_list);
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return 0;
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free_r_end_wq:
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destroy_workqueue(pblk->r_end_wq);
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free_bb_wq:
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destroy_workqueue(pblk->bb_wq);
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free_close_wq:
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destroy_workqueue(pblk->close_wq);
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free_w_rq_pool:
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mempool_destroy(pblk->w_rq_pool);
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free_e_rq_pool:
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mempool_destroy(pblk->e_rq_pool);
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free_r_rq_pool:
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mempool_destroy(pblk->r_rq_pool);
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free_rec_pool:
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mempool_destroy(pblk->rec_pool);
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free_gen_ws_pool:
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mempool_destroy(pblk->gen_ws_pool);
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free_page_bio_pool:
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mempool_destroy(pblk->page_bio_pool);
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free_global_caches:
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pblk_free_global_caches(pblk);
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return -ENOMEM;
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}
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static void pblk_core_free(struct pblk *pblk)
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{
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if (pblk->close_wq)
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destroy_workqueue(pblk->close_wq);
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if (pblk->r_end_wq)
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destroy_workqueue(pblk->r_end_wq);
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if (pblk->bb_wq)
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destroy_workqueue(pblk->bb_wq);
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mempool_destroy(pblk->page_bio_pool);
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mempool_destroy(pblk->gen_ws_pool);
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mempool_destroy(pblk->rec_pool);
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mempool_destroy(pblk->r_rq_pool);
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mempool_destroy(pblk->e_rq_pool);
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mempool_destroy(pblk->w_rq_pool);
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pblk_free_global_caches(pblk);
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}
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static void pblk_luns_free(struct pblk *pblk)
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{
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kfree(pblk->luns);
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}
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static void pblk_free_line_bitmaps(struct pblk_line *line)
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{
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kfree(line->blk_bitmap);
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kfree(line->erase_bitmap);
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}
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static void pblk_lines_free(struct pblk *pblk)
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{
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struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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struct pblk_line *line;
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int i;
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spin_lock(&l_mg->free_lock);
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for (i = 0; i < l_mg->nr_lines; i++) {
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line = &pblk->lines[i];
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pblk_line_free(pblk, line);
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pblk_free_line_bitmaps(line);
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}
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spin_unlock(&l_mg->free_lock);
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}
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static void pblk_line_meta_free(struct pblk *pblk)
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{
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struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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int i;
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kfree(l_mg->bb_template);
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kfree(l_mg->bb_aux);
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kfree(l_mg->vsc_list);
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for (i = 0; i < PBLK_DATA_LINES; i++) {
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kfree(l_mg->sline_meta[i]);
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pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
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kfree(l_mg->eline_meta[i]);
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}
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kfree(pblk->lines);
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}
|
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|
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static int pblk_bb_discovery(struct nvm_tgt_dev *dev, struct pblk_lun *rlun)
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{
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struct nvm_geo *geo = &dev->geo;
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struct ppa_addr ppa;
|
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u8 *blks;
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int nr_blks, ret;
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nr_blks = geo->blks_per_lun * geo->plane_mode;
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blks = kmalloc(nr_blks, GFP_KERNEL);
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if (!blks)
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return -ENOMEM;
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|
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ppa.ppa = 0;
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ppa.g.ch = rlun->bppa.g.ch;
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ppa.g.lun = rlun->bppa.g.lun;
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ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
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if (ret)
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goto out;
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|
|
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nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
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if (nr_blks < 0) {
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ret = nr_blks;
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goto out;
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}
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rlun->bb_list = blks;
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|
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return 0;
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out:
|
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kfree(blks);
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return ret;
|
|
}
|
|
|
|
static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line,
|
|
int blk_per_line)
|
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{
|
|
struct nvm_tgt_dev *dev = pblk->dev;
|
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struct nvm_geo *geo = &dev->geo;
|
|
struct pblk_lun *rlun;
|
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int bb_cnt = 0;
|
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int i;
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|
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for (i = 0; i < blk_per_line; i++) {
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rlun = &pblk->luns[i];
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if (rlun->bb_list[line->id] == NVM_BLK_T_FREE)
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continue;
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set_bit(pblk_ppa_to_pos(geo, rlun->bppa), line->blk_bitmap);
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bb_cnt++;
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}
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return bb_cnt;
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}
|
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|
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static int pblk_alloc_line_bitmaps(struct pblk *pblk, struct pblk_line *line)
|
|
{
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|
struct pblk_line_meta *lm = &pblk->lm;
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|
|
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line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
|
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if (!line->blk_bitmap)
|
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return -ENOMEM;
|
|
|
|
line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
|
|
if (!line->erase_bitmap) {
|
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kfree(line->blk_bitmap);
|
|
return -ENOMEM;
|
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}
|
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|
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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;
|
|
}
|
|
}
|
|
|
|
#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");
|
|
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) {
|
|
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]);
|
|
|
|
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->mid_thrs = lm->sec_per_line / 2;
|
|
lm->high_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 ? geo->nr_luns - i : 0;
|
|
|
|
lm->min_blk_line = 1;
|
|
if (geo->nr_luns > 1)
|
|
lm->min_blk_line += 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)
|
|
{
|
|
timer_setup(&pblk->wtimer, pblk_write_timer_fn, 0);
|
|
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);
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
pr_info("pblk exit: L2P CRC: %x\n", pblk_l2p_crc(pblk));
|
|
#endif
|
|
|
|
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: host-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;
|
|
pblk->gc.gc_enabled = 0;
|
|
|
|
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);
|
|
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_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));
|
|
|
|
blk_queue_write_cache(tqueue, true, false);
|
|
|
|
tqueue->limits.discard_granularity = geo->pgs_per_blk * geo->pfpg_size;
|
|
tqueue->limits.discard_alignment = 0;
|
|
blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9);
|
|
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, tqueue);
|
|
|
|
pr_info("pblk init: luns:%u, lines:%d, secs:%llu, buf entries:%u\n",
|
|
geo->nr_luns, pblk->l_mg.nr_lines,
|
|
(unsigned long long)pblk->rl.nr_secs,
|
|
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_lines:
|
|
pblk_lines_free(pblk);
|
|
fail_free_l2p:
|
|
pblk_l2p_free(pblk);
|
|
fail_free_core:
|
|
pblk_core_free(pblk);
|
|
fail_free_line_meta:
|
|
pblk_line_meta_free(pblk);
|
|
fail_free_luns:
|
|
pblk_luns_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},
|
|
|
|
.make_rq = pblk_make_rq,
|
|
.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;
|
|
|
|
pblk_bio_set = bioset_create(BIO_POOL_SIZE, 0, 0);
|
|
if (!pblk_bio_set)
|
|
return -ENOMEM;
|
|
ret = nvm_register_tgt_type(&tt_pblk);
|
|
if (ret)
|
|
bioset_free(pblk_bio_set);
|
|
return ret;
|
|
}
|
|
|
|
static void pblk_module_exit(void)
|
|
{
|
|
bioset_free(pblk_bio_set);
|
|
nvm_unregister_tgt_type(&tt_pblk);
|
|
}
|
|
|
|
module_init(pblk_module_init);
|
|
module_exit(pblk_module_exit);
|
|
MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>");
|
|
MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");
|