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path: root/drivers/lightnvm/pblk-init.c
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Diffstat (limited to 'drivers/lightnvm/pblk-init.c')
-rw-r--r--drivers/lightnvm/pblk-init.c1324
1 files changed, 0 insertions, 1324 deletions
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
deleted file mode 100644
index 5924f09c217b..000000000000
--- a/drivers/lightnvm/pblk-init.c
+++ /dev/null
@@ -1,1324 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
- * Copyright (C) 2016 CNEX Labs
- * Initial release: Javier Gonzalez <javier@cnexlabs.com>
- * Matias Bjorling <matias@cnexlabs.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * Implementation of a physical block-device target for Open-channel SSDs.
- *
- * pblk-init.c - pblk's initialization.
- */
-
-#include "pblk.h"
-#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 <javier@cnexlabs.com>");
-MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs");