diff options
Diffstat (limited to 'drivers/lightnvm/pblk-init.c')
| -rw-r--r-- | drivers/lightnvm/pblk-init.c | 1324 |
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"); |