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![Javier González](/assets/img/avatar_default.png)
Remove unnecessary checks when freeing dma memory in the completion path. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <matias@cnexlabs.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
607 lines
16 KiB
C
607 lines
16 KiB
C
/*
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* Copyright (C) 2016 CNEX Labs
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* Initial release: Javier Gonzalez <javier@cnexlabs.com>
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* Matias Bjorling <matias@cnexlabs.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* pblk-write.c - pblk's write path from write buffer to media
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*/
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#include "pblk.h"
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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 nvm_tgt_dev *dev = pblk->dev;
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struct bio *original_bio;
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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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w_ctx = pblk_rb_w_ctx(&pblk->rwb, c_ctx->sentry + i);
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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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#ifdef CONFIG_NVM_DEBUG
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atomic_long_add(c_ctx->nr_valid, &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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nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
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bio_put(rqd->bio);
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pblk_free_rqd(pblk, rqd, 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_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, rqd->ppa_list, rqd->nr_ppas, 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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/* When a write fails, we are not sure whether the block has grown bad or a page
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* range is more susceptible to write errors. If a high number of pages fail, we
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* assume that the block is bad and we mark it accordingly. In all cases, we
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* remap and resubmit the failed entries as fast as possible; if a flush is
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* waiting on a completion, the whole stack would stall otherwise.
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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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void *comp_bits = &rqd->ppa_status;
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
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struct pblk_rec_ctx *recovery;
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struct ppa_addr *ppa_list = rqd->ppa_list;
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int nr_ppas = rqd->nr_ppas;
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unsigned int c_entries;
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int bit, ret;
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if (unlikely(nr_ppas == 1))
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ppa_list = &rqd->ppa_addr;
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recovery = mempool_alloc(pblk->rec_pool, GFP_ATOMIC);
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if (!recovery) {
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pr_err("pblk: could not allocate recovery context\n");
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return;
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}
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INIT_LIST_HEAD(&recovery->failed);
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bit = -1;
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while ((bit = find_next_bit(comp_bits, nr_ppas, bit + 1)) < nr_ppas) {
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struct pblk_rb_entry *entry;
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struct ppa_addr ppa;
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/* Logic error */
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if (bit > c_ctx->nr_valid) {
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WARN_ONCE(1, "pblk: corrupted write request\n");
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mempool_free(recovery, pblk->rec_pool);
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goto out;
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}
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ppa = ppa_list[bit];
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entry = pblk_rb_sync_scan_entry(&pblk->rwb, &ppa);
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if (!entry) {
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pr_err("pblk: could not scan entry on write failure\n");
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mempool_free(recovery, pblk->rec_pool);
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goto out;
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}
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/* The list is filled first and emptied afterwards. No need for
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* protecting it with a lock
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*/
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list_add_tail(&entry->index, &recovery->failed);
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}
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c_entries = find_first_bit(comp_bits, nr_ppas);
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ret = pblk_recov_setup_rq(pblk, c_ctx, recovery, comp_bits, c_entries);
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if (ret) {
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pr_err("pblk: could not recover from write failure\n");
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mempool_free(recovery, pblk->rec_pool);
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goto out;
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}
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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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out:
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pblk_complete_write(pblk, rqd, c_ctx);
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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_log_write_err(pblk, rqd);
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return pblk_end_w_fail(pblk, rqd);
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}
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#ifdef CONFIG_NVM_DEBUG
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else
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WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
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#endif
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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 nvm_tgt_dev *dev = pblk->dev;
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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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int sync;
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pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
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if (rqd->error) {
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pblk_log_write_err(pblk, rqd);
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pr_err("pblk: metadata I/O failed. Line %d\n", line->id);
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}
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#ifdef CONFIG_NVM_DEBUG
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else
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WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
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#endif
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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_line_run_ws(pblk, line, NULL, pblk_line_close_ws,
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pblk->close_wq);
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bio_put(rqd->bio);
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nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
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pblk_free_rqd(pblk, rqd, READ);
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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,
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nvm_end_io_fn(*end_io))
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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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->flags = pblk_set_progr_mode(pblk, WRITE);
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rqd->private = pblk;
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rqd->end_io = end_io;
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rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
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&rqd->dma_meta_list);
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if (!rqd->meta_list)
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return -ENOMEM;
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rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
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rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;
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return 0;
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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 pblk_c_ctx *c_ctx, 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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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 = 0;
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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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pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, valid, 0);
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else
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pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
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valid, erase_ppa);
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return 0;
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}
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int pblk_setup_w_rec_rq(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_line_meta *lm = &pblk->lm;
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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, rqd->nr_ppas, pblk_end_io_write);
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if (ret)
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return ret;
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pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, c_ctx->nr_valid, 0);
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rqd->ppa_status = (u64)0;
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rqd->flags = pblk_set_progr_mode(pblk, WRITE);
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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);
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#ifdef CONFIG_NVM_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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pr_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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static inline int pblk_valid_meta_ppa(struct pblk *pblk,
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struct pblk_line *meta_line,
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struct ppa_addr *ppa_list, int nr_ppas)
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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 *data_line;
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struct ppa_addr ppa, ppa_opt;
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u64 paddr;
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int i;
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data_line = &pblk->lines[pblk_dev_ppa_to_line(ppa_list[0])];
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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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if (test_bit(pblk_ppa_to_pos(geo, ppa), data_line->blk_bitmap))
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return 1;
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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 a LUN deadlock. In this case, modify
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* the distance to not be optimal, but allow metadata I/Os to succeed.
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*/
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ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0);
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if (unlikely(ppa_opt.ppa == ppa.ppa)) {
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data_line->meta_distance--;
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return 0;
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}
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for (i = 0; i < nr_ppas; i += pblk->min_write_pgs)
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if (ppa_list[i].g.ch == ppa_opt.g.ch &&
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ppa_list[i].g.lun == ppa_opt.g.lun)
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return 1;
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if (test_bit(pblk_ppa_to_pos(geo, ppa_opt), data_line->blk_bitmap)) {
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for (i = 0; i < nr_ppas; i += pblk->min_write_pgs)
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if (ppa_list[i].g.ch == ppa.g.ch &&
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ppa_list[i].g.lun == ppa.g.lun)
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return 0;
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return 1;
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}
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return 0;
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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 pblk_g_ctx *m_ctx;
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struct bio *bio;
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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, READ);
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if (IS_ERR(rqd)) {
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pr_err("pblk: cannot allocate write req.\n");
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return PTR_ERR(rqd);
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}
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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->sec_size;
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data = ((void *)emeta->buf) + emeta->mem;
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bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
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l_mg->emeta_alloc_type, GFP_KERNEL);
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if (IS_ERR(bio)) {
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ret = PTR_ERR(bio);
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goto fail_free_rqd;
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}
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bio->bi_iter.bi_sector = 0; /* internal bio */
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bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
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rqd->bio = bio;
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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_bio;
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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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rqd->ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id);
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}
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emeta->mem += rq_len;
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if (emeta->mem >= lm->emeta_len[0]) {
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spin_lock(&l_mg->close_lock);
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list_del(&meta_line->list);
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WARN(!bitmap_full(meta_line->map_bitmap, lm->sec_per_line),
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"pblk: corrupt meta line %d\n", meta_line->id);
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spin_unlock(&l_mg->close_lock);
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}
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pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas);
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ret = pblk_submit_io(pblk, rqd);
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if (ret) {
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pr_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_page(pblk, rqd->ppa_list, rqd->nr_ppas);
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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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nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
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fail_free_bio:
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if (likely(l_mg->emeta_alloc_type == PBLK_VMALLOC_META))
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bio_put(bio);
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fail_free_rqd:
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pblk_free_rqd(pblk, rqd, READ);
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return ret;
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}
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static int pblk_sched_meta_io(struct pblk *pblk, struct ppa_addr *prev_list,
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int prev_n)
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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);
|
|
retry:
|
|
if (list_empty(&l_mg->emeta_list)) {
|
|
spin_unlock(&l_mg->close_lock);
|
|
return 0;
|
|
}
|
|
meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list);
|
|
if (bitmap_full(meta_line->map_bitmap, lm->sec_per_line))
|
|
goto retry;
|
|
spin_unlock(&l_mg->close_lock);
|
|
|
|
if (!pblk_valid_meta_ppa(pblk, meta_line, prev_list, prev_n))
|
|
return 0;
|
|
|
|
return pblk_submit_meta_io(pblk, meta_line);
|
|
}
|
|
|
|
static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd)
|
|
{
|
|
struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
|
|
struct ppa_addr erase_ppa;
|
|
int err;
|
|
|
|
ppa_set_empty(&erase_ppa);
|
|
|
|
/* Assign lbas to ppas and populate request structure */
|
|
err = pblk_setup_w_rq(pblk, rqd, c_ctx, &erase_ppa);
|
|
if (err) {
|
|
pr_err("pblk: could not setup write request: %d\n", err);
|
|
return NVM_IO_ERR;
|
|
}
|
|
|
|
if (likely(ppa_empty(erase_ppa))) {
|
|
/* Submit metadata write for previous data line */
|
|
err = pblk_sched_meta_io(pblk, rqd->ppa_list, rqd->nr_ppas);
|
|
if (err) {
|
|
pr_err("pblk: metadata I/O submission failed: %d", err);
|
|
return NVM_IO_ERR;
|
|
}
|
|
|
|
/* Submit data write for current data line */
|
|
err = pblk_submit_io(pblk, rqd);
|
|
if (err) {
|
|
pr_err("pblk: data I/O submission failed: %d\n", err);
|
|
return NVM_IO_ERR;
|
|
}
|
|
} else {
|
|
/* Submit data write for current data line */
|
|
err = pblk_submit_io(pblk, rqd);
|
|
if (err) {
|
|
pr_err("pblk: data I/O submission failed: %d\n", err);
|
|
return NVM_IO_ERR;
|
|
}
|
|
|
|
/* Submit available 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));
|
|
}
|
|
}
|
|
|
|
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, rqd->nr_ppas, c_ctx->nr_padded);
|
|
}
|
|
|
|
static int pblk_submit_write(struct pblk *pblk)
|
|
{
|
|
struct bio *bio;
|
|
struct nvm_rq *rqd;
|
|
unsigned int secs_avail, secs_to_sync, secs_to_com;
|
|
unsigned int secs_to_flush;
|
|
unsigned long pos;
|
|
|
|
/* 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 1;
|
|
|
|
secs_to_flush = pblk_rb_sync_point_count(&pblk->rwb);
|
|
if (!secs_to_flush && secs_avail < pblk->min_write_pgs)
|
|
return 1;
|
|
|
|
rqd = pblk_alloc_rqd(pblk, WRITE);
|
|
if (IS_ERR(rqd)) {
|
|
pr_err("pblk: cannot allocate write req.\n");
|
|
return 1;
|
|
}
|
|
|
|
bio = bio_alloc(GFP_KERNEL, pblk->max_write_pgs);
|
|
if (!bio) {
|
|
pr_err("pblk: cannot allocate write bio\n");
|
|
goto fail_free_rqd;
|
|
}
|
|
bio->bi_iter.bi_sector = 0; /* internal bio */
|
|
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
|
|
rqd->bio = bio;
|
|
|
|
secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, secs_to_flush);
|
|
if (secs_to_sync > pblk->max_write_pgs) {
|
|
pr_err("pblk: bad buffer sync calculation\n");
|
|
goto fail_put_bio;
|
|
}
|
|
|
|
secs_to_com = (secs_to_sync > secs_avail) ? secs_avail : secs_to_sync;
|
|
pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
|
|
|
|
if (pblk_rb_read_to_bio(&pblk->rwb, rqd, bio, pos, secs_to_sync,
|
|
secs_avail)) {
|
|
pr_err("pblk: corrupted write bio\n");
|
|
goto fail_put_bio;
|
|
}
|
|
|
|
if (pblk_submit_io_set(pblk, rqd))
|
|
goto fail_free_bio;
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
atomic_long_add(secs_to_sync, &pblk->sub_writes);
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
fail_free_bio:
|
|
pblk_free_write_rqd(pblk, rqd);
|
|
fail_put_bio:
|
|
bio_put(bio);
|
|
fail_free_rqd:
|
|
pblk_free_rqd(pblk, rqd, WRITE);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int pblk_write_ts(void *data)
|
|
{
|
|
struct pblk *pblk = data;
|
|
|
|
while (!kthread_should_stop()) {
|
|
if (!pblk_submit_write(pblk))
|
|
continue;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
io_schedule();
|
|
}
|
|
|
|
return 0;
|
|
}
|