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665 lines
17 KiB
665 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2016 CNEX Labs |
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* Initial release: Javier Gonzalez <[email protected]> |
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* Matias Bjorling <[email protected]> |
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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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* pblk-write.c - pblk's write path from write buffer to media |
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*/ |
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|
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#include "pblk.h" |
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#include "pblk-trace.h" |
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|
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static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd, |
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struct pblk_c_ctx *c_ctx) |
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{ |
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struct bio *original_bio; |
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struct pblk_rb *rwb = &pblk->rwb; |
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unsigned long ret; |
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int i; |
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for (i = 0; i < c_ctx->nr_valid; i++) { |
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struct pblk_w_ctx *w_ctx; |
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int pos = c_ctx->sentry + i; |
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int flags; |
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w_ctx = pblk_rb_w_ctx(rwb, pos); |
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flags = READ_ONCE(w_ctx->flags); |
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if (flags & PBLK_FLUSH_ENTRY) { |
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flags &= ~PBLK_FLUSH_ENTRY; |
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/* Release flags on context. Protect from writes */ |
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smp_store_release(&w_ctx->flags, flags); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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atomic_dec(&rwb->inflight_flush_point); |
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#endif |
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} |
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while ((original_bio = bio_list_pop(&w_ctx->bios))) |
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bio_endio(original_bio); |
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} |
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if (c_ctx->nr_padded) |
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pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, |
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c_ctx->nr_padded); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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atomic_long_add(rqd->nr_ppas, &pblk->sync_writes); |
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#endif |
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ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid); |
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bio_put(rqd->bio); |
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pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
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return ret; |
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} |
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static unsigned long pblk_end_queued_w_bio(struct pblk *pblk, |
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struct nvm_rq *rqd, |
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struct pblk_c_ctx *c_ctx) |
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{ |
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list_del(&c_ctx->list); |
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return pblk_end_w_bio(pblk, rqd, c_ctx); |
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} |
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static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd, |
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struct pblk_c_ctx *c_ctx) |
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{ |
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struct pblk_c_ctx *c, *r; |
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unsigned long flags; |
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unsigned long pos; |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes); |
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#endif |
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pblk_up_rq(pblk, c_ctx->lun_bitmap); |
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pos = pblk_rb_sync_init(&pblk->rwb, &flags); |
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if (pos == c_ctx->sentry) { |
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pos = pblk_end_w_bio(pblk, rqd, c_ctx); |
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retry: |
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list_for_each_entry_safe(c, r, &pblk->compl_list, list) { |
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rqd = nvm_rq_from_c_ctx(c); |
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if (c->sentry == pos) { |
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pos = pblk_end_queued_w_bio(pblk, rqd, c); |
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goto retry; |
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} |
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} |
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} else { |
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WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd); |
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list_add_tail(&c_ctx->list, &pblk->compl_list); |
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} |
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pblk_rb_sync_end(&pblk->rwb, &flags); |
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} |
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/* Map remaining sectors in chunk, starting from ppa */ |
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static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa, |
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int rqd_ppas) |
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{ |
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struct pblk_line *line; |
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struct ppa_addr map_ppa = *ppa; |
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__le64 addr_empty = cpu_to_le64(ADDR_EMPTY); |
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__le64 *lba_list; |
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u64 paddr; |
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int done = 0; |
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int n = 0; |
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line = pblk_ppa_to_line(pblk, *ppa); |
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lba_list = emeta_to_lbas(pblk, line->emeta->buf); |
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spin_lock(&line->lock); |
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while (!done) { |
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paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa); |
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if (!test_and_set_bit(paddr, line->map_bitmap)) |
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line->left_msecs--; |
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if (n < rqd_ppas && lba_list[paddr] != addr_empty) |
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line->nr_valid_lbas--; |
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lba_list[paddr] = addr_empty; |
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if (!test_and_set_bit(paddr, line->invalid_bitmap)) |
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le32_add_cpu(line->vsc, -1); |
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done = nvm_next_ppa_in_chk(pblk->dev, &map_ppa); |
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n++; |
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} |
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line->w_err_gc->has_write_err = 1; |
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spin_unlock(&line->lock); |
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} |
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static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry, |
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unsigned int nr_entries) |
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{ |
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struct pblk_rb *rb = &pblk->rwb; |
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struct pblk_rb_entry *entry; |
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struct pblk_line *line; |
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struct pblk_w_ctx *w_ctx; |
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struct ppa_addr ppa_l2p; |
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int flags; |
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unsigned int i; |
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spin_lock(&pblk->trans_lock); |
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for (i = 0; i < nr_entries; i++) { |
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entry = &rb->entries[pblk_rb_ptr_wrap(rb, sentry, i)]; |
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w_ctx = &entry->w_ctx; |
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/* Check if the lba has been overwritten */ |
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if (w_ctx->lba != ADDR_EMPTY) { |
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ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba); |
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if (!pblk_ppa_comp(ppa_l2p, entry->cacheline)) |
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w_ctx->lba = ADDR_EMPTY; |
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} |
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/* Mark up the entry as submittable again */ |
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flags = READ_ONCE(w_ctx->flags); |
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flags |= PBLK_WRITTEN_DATA; |
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/* Release flags on write context. Protect from writes */ |
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smp_store_release(&w_ctx->flags, flags); |
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|
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/* Decrease the reference count to the line as we will |
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* re-map these entries |
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*/ |
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line = pblk_ppa_to_line(pblk, w_ctx->ppa); |
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atomic_dec(&line->sec_to_update); |
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kref_put(&line->ref, pblk_line_put); |
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} |
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spin_unlock(&pblk->trans_lock); |
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} |
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static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx) |
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{ |
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struct pblk_c_ctx *r_ctx; |
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r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL); |
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if (!r_ctx) |
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return; |
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r_ctx->lun_bitmap = NULL; |
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r_ctx->sentry = c_ctx->sentry; |
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r_ctx->nr_valid = c_ctx->nr_valid; |
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r_ctx->nr_padded = c_ctx->nr_padded; |
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spin_lock(&pblk->resubmit_lock); |
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list_add_tail(&r_ctx->list, &pblk->resubmit_list); |
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spin_unlock(&pblk->resubmit_lock); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes); |
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#endif |
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} |
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static void pblk_submit_rec(struct work_struct *work) |
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{ |
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struct pblk_rec_ctx *recovery = |
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container_of(work, struct pblk_rec_ctx, ws_rec); |
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struct pblk *pblk = recovery->pblk; |
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struct nvm_rq *rqd = recovery->rqd; |
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); |
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
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pblk_log_write_err(pblk, rqd); |
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pblk_map_remaining(pblk, ppa_list, rqd->nr_ppas); |
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pblk_queue_resubmit(pblk, c_ctx); |
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pblk_up_rq(pblk, c_ctx->lun_bitmap); |
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if (c_ctx->nr_padded) |
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pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, |
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c_ctx->nr_padded); |
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bio_put(rqd->bio); |
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pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
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mempool_free(recovery, &pblk->rec_pool); |
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atomic_dec(&pblk->inflight_io); |
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pblk_write_kick(pblk); |
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} |
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static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd) |
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{ |
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struct pblk_rec_ctx *recovery; |
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recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC); |
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if (!recovery) { |
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pblk_err(pblk, "could not allocate recovery work\n"); |
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return; |
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} |
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recovery->pblk = pblk; |
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recovery->rqd = rqd; |
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INIT_WORK(&recovery->ws_rec, pblk_submit_rec); |
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queue_work(pblk->close_wq, &recovery->ws_rec); |
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} |
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static void pblk_end_io_write(struct nvm_rq *rqd) |
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{ |
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struct pblk *pblk = rqd->private; |
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); |
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if (rqd->error) { |
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pblk_end_w_fail(pblk, rqd); |
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return; |
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} else { |
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if (trace_pblk_chunk_state_enabled()) |
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pblk_check_chunk_state_update(pblk, rqd); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n"); |
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#endif |
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} |
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pblk_complete_write(pblk, rqd, c_ctx); |
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atomic_dec(&pblk->inflight_io); |
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} |
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static void pblk_end_io_write_meta(struct nvm_rq *rqd) |
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{ |
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struct pblk *pblk = rqd->private; |
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struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd); |
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struct pblk_line *line = m_ctx->private; |
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struct pblk_emeta *emeta = line->emeta; |
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); |
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int sync; |
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pblk_up_chunk(pblk, ppa_list[0]); |
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if (rqd->error) { |
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pblk_log_write_err(pblk, rqd); |
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pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id); |
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line->w_err_gc->has_write_err = 1; |
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} else { |
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if (trace_pblk_chunk_state_enabled()) |
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pblk_check_chunk_state_update(pblk, rqd); |
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} |
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sync = atomic_add_return(rqd->nr_ppas, &emeta->sync); |
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if (sync == emeta->nr_entries) |
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pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws, |
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GFP_ATOMIC, pblk->close_wq); |
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pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); |
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atomic_dec(&pblk->inflight_io); |
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} |
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static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd, |
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unsigned int nr_secs, nvm_end_io_fn(*end_io)) |
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{ |
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/* Setup write request */ |
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rqd->opcode = NVM_OP_PWRITE; |
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rqd->nr_ppas = nr_secs; |
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rqd->is_seq = 1; |
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rqd->private = pblk; |
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rqd->end_io = end_io; |
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return pblk_alloc_rqd_meta(pblk, rqd); |
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} |
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static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd, |
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struct ppa_addr *erase_ppa) |
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{ |
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struct pblk_line_meta *lm = &pblk->lm; |
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struct pblk_line *e_line = pblk_line_get_erase(pblk); |
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); |
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unsigned int valid = c_ctx->nr_valid; |
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unsigned int padded = c_ctx->nr_padded; |
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unsigned int nr_secs = valid + padded; |
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unsigned long *lun_bitmap; |
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int ret; |
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lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL); |
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if (!lun_bitmap) |
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return -ENOMEM; |
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c_ctx->lun_bitmap = lun_bitmap; |
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ret = pblk_alloc_w_rq(pblk, rqd, nr_secs, pblk_end_io_write); |
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if (ret) { |
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kfree(lun_bitmap); |
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return ret; |
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} |
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if (likely(!e_line || !atomic_read(&e_line->left_eblks))) |
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ret = pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, |
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valid, 0); |
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else |
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ret = pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, |
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valid, erase_ppa); |
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return ret; |
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} |
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static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail, |
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unsigned int secs_to_flush) |
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{ |
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int secs_to_sync; |
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secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush, true); |
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#ifdef CONFIG_NVM_PBLK_DEBUG |
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if ((!secs_to_sync && secs_to_flush) |
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|| (secs_to_sync < 0) |
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|| (secs_to_sync > secs_avail && !secs_to_flush)) { |
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pblk_err(pblk, "bad sector calculation (a:%d,s:%d,f:%d)\n", |
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secs_avail, secs_to_sync, secs_to_flush); |
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} |
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#endif |
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return secs_to_sync; |
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} |
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int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) |
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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_line_mgmt *l_mg = &pblk->l_mg; |
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struct pblk_line_meta *lm = &pblk->lm; |
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struct pblk_emeta *emeta = meta_line->emeta; |
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struct ppa_addr *ppa_list; |
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struct pblk_g_ctx *m_ctx; |
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struct nvm_rq *rqd; |
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void *data; |
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u64 paddr; |
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int rq_ppas = pblk->min_write_pgs; |
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int id = meta_line->id; |
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int rq_len; |
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int i, j; |
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int ret; |
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rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); |
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m_ctx = nvm_rq_to_pdu(rqd); |
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m_ctx->private = meta_line; |
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rq_len = rq_ppas * geo->csecs; |
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data = ((void *)emeta->buf) + emeta->mem; |
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ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta); |
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if (ret) |
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goto fail_free_rqd; |
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ppa_list = nvm_rq_to_ppa_list(rqd); |
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for (i = 0; i < rqd->nr_ppas; ) { |
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spin_lock(&meta_line->lock); |
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paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas); |
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spin_unlock(&meta_line->lock); |
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for (j = 0; j < rq_ppas; j++, i++, paddr++) |
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ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id); |
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} |
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spin_lock(&l_mg->close_lock); |
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emeta->mem += rq_len; |
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if (emeta->mem >= lm->emeta_len[0]) |
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list_del(&meta_line->list); |
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spin_unlock(&l_mg->close_lock); |
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pblk_down_chunk(pblk, ppa_list[0]); |
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ret = pblk_submit_io(pblk, rqd, data); |
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if (ret) { |
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pblk_err(pblk, "emeta I/O submission failed: %d\n", ret); |
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goto fail_rollback; |
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} |
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return NVM_IO_OK; |
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fail_rollback: |
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pblk_up_chunk(pblk, ppa_list[0]); |
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spin_lock(&l_mg->close_lock); |
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pblk_dealloc_page(pblk, meta_line, rq_ppas); |
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list_add(&meta_line->list, &meta_line->list); |
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spin_unlock(&l_mg->close_lock); |
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fail_free_rqd: |
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pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); |
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return ret; |
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} |
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static inline bool pblk_valid_meta_ppa(struct pblk *pblk, |
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struct pblk_line *meta_line, |
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struct nvm_rq *data_rqd) |
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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_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd); |
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struct pblk_line *data_line = pblk_line_get_data(pblk); |
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struct ppa_addr ppa, ppa_opt; |
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u64 paddr; |
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int pos_opt; |
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|
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/* Schedule a metadata I/O that is half the distance from the data I/O |
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* with regards to the number of LUNs forming the pblk instance. This |
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* balances LUN conflicts across every I/O. |
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* |
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* When the LUN configuration changes (e.g., due to GC), this distance |
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* can align, which would result on metadata and data I/Os colliding. In |
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* this case, modify the distance to not be optimal, but move the |
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* optimal in the right direction. |
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*/ |
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paddr = pblk_lookup_page(pblk, meta_line); |
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ppa = addr_to_gen_ppa(pblk, paddr, 0); |
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ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0); |
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pos_opt = pblk_ppa_to_pos(geo, ppa_opt); |
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if (test_bit(pos_opt, data_c_ctx->lun_bitmap) || |
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test_bit(pos_opt, data_line->blk_bitmap)) |
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return true; |
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if (unlikely(pblk_ppa_comp(ppa_opt, ppa))) |
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data_line->meta_distance--; |
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return false; |
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} |
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static struct pblk_line *pblk_should_submit_meta_io(struct pblk *pblk, |
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struct nvm_rq *data_rqd) |
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{ |
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struct pblk_line_meta *lm = &pblk->lm; |
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struct pblk_line_mgmt *l_mg = &pblk->l_mg; |
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struct pblk_line *meta_line; |
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spin_lock(&l_mg->close_lock); |
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if (list_empty(&l_mg->emeta_list)) { |
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spin_unlock(&l_mg->close_lock); |
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return NULL; |
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} |
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meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list); |
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if (meta_line->emeta->mem >= lm->emeta_len[0]) { |
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spin_unlock(&l_mg->close_lock); |
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return NULL; |
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} |
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spin_unlock(&l_mg->close_lock); |
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if (!pblk_valid_meta_ppa(pblk, meta_line, data_rqd)) |
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return NULL; |
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return meta_line; |
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} |
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static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd) |
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{ |
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struct ppa_addr erase_ppa; |
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struct pblk_line *meta_line; |
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int err; |
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pblk_ppa_set_empty(&erase_ppa); |
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|
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/* Assign lbas to ppas and populate request structure */ |
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err = pblk_setup_w_rq(pblk, rqd, &erase_ppa); |
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if (err) { |
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pblk_err(pblk, "could not setup write request: %d\n", err); |
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return NVM_IO_ERR; |
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} |
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|
|
meta_line = pblk_should_submit_meta_io(pblk, rqd); |
|
|
|
/* Submit data write for current data line */ |
|
err = pblk_submit_io(pblk, rqd, NULL); |
|
if (err) { |
|
pblk_err(pblk, "data I/O submission failed: %d\n", err); |
|
return NVM_IO_ERR; |
|
} |
|
|
|
if (!pblk_ppa_empty(erase_ppa)) { |
|
/* Submit erase for next data line */ |
|
if (pblk_blk_erase_async(pblk, erase_ppa)) { |
|
struct pblk_line *e_line = pblk_line_get_erase(pblk); |
|
struct nvm_tgt_dev *dev = pblk->dev; |
|
struct nvm_geo *geo = &dev->geo; |
|
int bit; |
|
|
|
atomic_inc(&e_line->left_eblks); |
|
bit = pblk_ppa_to_pos(geo, erase_ppa); |
|
WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap)); |
|
} |
|
} |
|
|
|
if (meta_line) { |
|
/* Submit metadata write for previous data line */ |
|
err = pblk_submit_meta_io(pblk, meta_line); |
|
if (err) { |
|
pblk_err(pblk, "metadata I/O submission failed: %d", |
|
err); |
|
return NVM_IO_ERR; |
|
} |
|
} |
|
|
|
return NVM_IO_OK; |
|
} |
|
|
|
static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd) |
|
{ |
|
struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); |
|
struct bio *bio = rqd->bio; |
|
|
|
if (c_ctx->nr_padded) |
|
pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid, |
|
c_ctx->nr_padded); |
|
} |
|
|
|
static int pblk_submit_write(struct pblk *pblk, int *secs_left) |
|
{ |
|
struct bio *bio; |
|
struct nvm_rq *rqd; |
|
unsigned int secs_avail, secs_to_sync, secs_to_com; |
|
unsigned int secs_to_flush, packed_meta_pgs; |
|
unsigned long pos; |
|
unsigned int resubmit; |
|
|
|
*secs_left = 0; |
|
|
|
spin_lock(&pblk->resubmit_lock); |
|
resubmit = !list_empty(&pblk->resubmit_list); |
|
spin_unlock(&pblk->resubmit_lock); |
|
|
|
/* Resubmit failed writes first */ |
|
if (resubmit) { |
|
struct pblk_c_ctx *r_ctx; |
|
|
|
spin_lock(&pblk->resubmit_lock); |
|
r_ctx = list_first_entry(&pblk->resubmit_list, |
|
struct pblk_c_ctx, list); |
|
list_del(&r_ctx->list); |
|
spin_unlock(&pblk->resubmit_lock); |
|
|
|
secs_avail = r_ctx->nr_valid; |
|
pos = r_ctx->sentry; |
|
|
|
pblk_prepare_resubmit(pblk, pos, secs_avail); |
|
secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, |
|
secs_avail); |
|
|
|
kfree(r_ctx); |
|
} else { |
|
/* If there are no sectors in the cache, |
|
* flushes (bios without data) will be cleared on |
|
* the cache threads |
|
*/ |
|
secs_avail = pblk_rb_read_count(&pblk->rwb); |
|
if (!secs_avail) |
|
return 0; |
|
|
|
secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb); |
|
if (!secs_to_flush && secs_avail < pblk->min_write_pgs_data) |
|
return 0; |
|
|
|
secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, |
|
secs_to_flush); |
|
if (secs_to_sync > pblk->max_write_pgs) { |
|
pblk_err(pblk, "bad buffer sync calculation\n"); |
|
return 0; |
|
} |
|
|
|
secs_to_com = (secs_to_sync > secs_avail) ? |
|
secs_avail : secs_to_sync; |
|
pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com); |
|
} |
|
|
|
packed_meta_pgs = (pblk->min_write_pgs - pblk->min_write_pgs_data); |
|
bio = bio_alloc(GFP_KERNEL, secs_to_sync + packed_meta_pgs); |
|
|
|
bio->bi_iter.bi_sector = 0; /* internal bio */ |
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
|
|
|
rqd = pblk_alloc_rqd(pblk, PBLK_WRITE); |
|
rqd->bio = bio; |
|
|
|
if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync, |
|
secs_avail)) { |
|
pblk_err(pblk, "corrupted write bio\n"); |
|
goto fail_put_bio; |
|
} |
|
|
|
if (pblk_submit_io_set(pblk, rqd)) |
|
goto fail_free_bio; |
|
|
|
#ifdef CONFIG_NVM_PBLK_DEBUG |
|
atomic_long_add(secs_to_sync, &pblk->sub_writes); |
|
#endif |
|
|
|
*secs_left = 1; |
|
return 0; |
|
|
|
fail_free_bio: |
|
pblk_free_write_rqd(pblk, rqd); |
|
fail_put_bio: |
|
bio_put(bio); |
|
pblk_free_rqd(pblk, rqd, PBLK_WRITE); |
|
|
|
return -EINTR; |
|
} |
|
|
|
int pblk_write_ts(void *data) |
|
{ |
|
struct pblk *pblk = data; |
|
int secs_left; |
|
int write_failure = 0; |
|
|
|
while (!kthread_should_stop()) { |
|
if (!write_failure) { |
|
write_failure = pblk_submit_write(pblk, &secs_left); |
|
|
|
if (secs_left) |
|
continue; |
|
} |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
io_schedule(); |
|
} |
|
|
|
return 0; |
|
}
|
|
|