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![Tian Tao](/assets/img/avatar_default.png)
Remove NULL checks before vfree() to fix these warnings: ./drivers/lightnvm/pblk-gc.c:27:2-7: WARNING: NULL check before some freeing functions is not needed. Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Signed-off-by: Matias Bjørling <matias.bjorling@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
726 lines
16 KiB
C
726 lines
16 KiB
C
// 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 <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-gc.c - pblk's garbage collector
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*/
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#include "pblk.h"
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#include "pblk-trace.h"
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#include <linux/delay.h>
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static void pblk_gc_free_gc_rq(struct pblk_gc_rq *gc_rq)
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{
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vfree(gc_rq->data);
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kfree(gc_rq);
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}
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static int pblk_gc_write(struct pblk *pblk)
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{
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struct pblk_gc *gc = &pblk->gc;
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struct pblk_gc_rq *gc_rq, *tgc_rq;
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LIST_HEAD(w_list);
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spin_lock(&gc->w_lock);
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if (list_empty(&gc->w_list)) {
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spin_unlock(&gc->w_lock);
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return 1;
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}
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list_cut_position(&w_list, &gc->w_list, gc->w_list.prev);
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gc->w_entries = 0;
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spin_unlock(&gc->w_lock);
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list_for_each_entry_safe(gc_rq, tgc_rq, &w_list, list) {
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pblk_write_gc_to_cache(pblk, gc_rq);
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list_del(&gc_rq->list);
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kref_put(&gc_rq->line->ref, pblk_line_put);
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pblk_gc_free_gc_rq(gc_rq);
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}
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return 0;
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}
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static void pblk_gc_writer_kick(struct pblk_gc *gc)
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{
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wake_up_process(gc->gc_writer_ts);
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}
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void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line)
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{
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struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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struct list_head *move_list;
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spin_lock(&l_mg->gc_lock);
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spin_lock(&line->lock);
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WARN_ON(line->state != PBLK_LINESTATE_GC);
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line->state = PBLK_LINESTATE_CLOSED;
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trace_pblk_line_state(pblk_disk_name(pblk), line->id,
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line->state);
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/* We need to reset gc_group in order to ensure that
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* pblk_line_gc_list will return proper move_list
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* since right now current line is not on any of the
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* gc lists.
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*/
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line->gc_group = PBLK_LINEGC_NONE;
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move_list = pblk_line_gc_list(pblk, line);
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spin_unlock(&line->lock);
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list_add_tail(&line->list, move_list);
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spin_unlock(&l_mg->gc_lock);
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}
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static void pblk_gc_line_ws(struct work_struct *work)
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{
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struct pblk_line_ws *gc_rq_ws = container_of(work,
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struct pblk_line_ws, ws);
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struct pblk *pblk = gc_rq_ws->pblk;
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struct pblk_gc *gc = &pblk->gc;
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struct pblk_line *line = gc_rq_ws->line;
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struct pblk_gc_rq *gc_rq = gc_rq_ws->priv;
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int ret;
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up(&gc->gc_sem);
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/* Read from GC victim block */
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ret = pblk_submit_read_gc(pblk, gc_rq);
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if (ret) {
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line->w_err_gc->has_gc_err = 1;
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goto out;
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}
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if (!gc_rq->secs_to_gc)
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goto out;
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retry:
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spin_lock(&gc->w_lock);
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if (gc->w_entries >= PBLK_GC_RQ_QD) {
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spin_unlock(&gc->w_lock);
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pblk_gc_writer_kick(&pblk->gc);
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usleep_range(128, 256);
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goto retry;
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}
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gc->w_entries++;
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list_add_tail(&gc_rq->list, &gc->w_list);
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spin_unlock(&gc->w_lock);
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pblk_gc_writer_kick(&pblk->gc);
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kfree(gc_rq_ws);
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return;
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out:
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pblk_gc_free_gc_rq(gc_rq);
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kref_put(&line->ref, pblk_line_put);
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kfree(gc_rq_ws);
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}
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static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
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struct pblk_line *line)
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{
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struct line_emeta *emeta_buf;
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struct pblk_line_meta *lm = &pblk->lm;
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unsigned int lba_list_size = lm->emeta_len[2];
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__le64 *lba_list;
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int ret;
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emeta_buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
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if (!emeta_buf)
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return NULL;
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ret = pblk_line_emeta_read(pblk, line, emeta_buf);
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if (ret) {
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pblk_err(pblk, "line %d read emeta failed (%d)\n",
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line->id, ret);
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kvfree(emeta_buf);
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return NULL;
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}
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/* If this read fails, it means that emeta is corrupted.
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* For now, leave the line untouched.
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* TODO: Implement a recovery routine that scans and moves
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* all sectors on the line.
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*/
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ret = pblk_recov_check_emeta(pblk, emeta_buf);
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if (ret) {
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pblk_err(pblk, "inconsistent emeta (line %d)\n",
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line->id);
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kvfree(emeta_buf);
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return NULL;
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}
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lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
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if (lba_list)
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memcpy(lba_list, emeta_to_lbas(pblk, emeta_buf), lba_list_size);
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kvfree(emeta_buf);
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return lba_list;
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}
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static void pblk_gc_line_prepare_ws(struct work_struct *work)
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{
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struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
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ws);
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struct pblk *pblk = line_ws->pblk;
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struct pblk_line *line = line_ws->line;
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struct pblk_line_meta *lm = &pblk->lm;
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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_gc *gc = &pblk->gc;
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struct pblk_line_ws *gc_rq_ws;
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struct pblk_gc_rq *gc_rq;
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__le64 *lba_list;
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unsigned long *invalid_bitmap;
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int sec_left, nr_secs, bit;
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invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_KERNEL);
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if (!invalid_bitmap)
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goto fail_free_ws;
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if (line->w_err_gc->has_write_err) {
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lba_list = line->w_err_gc->lba_list;
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line->w_err_gc->lba_list = NULL;
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} else {
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lba_list = get_lba_list_from_emeta(pblk, line);
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if (!lba_list) {
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pblk_err(pblk, "could not interpret emeta (line %d)\n",
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line->id);
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goto fail_free_invalid_bitmap;
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}
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}
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spin_lock(&line->lock);
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bitmap_copy(invalid_bitmap, line->invalid_bitmap, lm->sec_per_line);
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sec_left = pblk_line_vsc(line);
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spin_unlock(&line->lock);
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if (sec_left < 0) {
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pblk_err(pblk, "corrupted GC line (%d)\n", line->id);
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goto fail_free_lba_list;
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}
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bit = -1;
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next_rq:
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gc_rq = kmalloc(sizeof(struct pblk_gc_rq), GFP_KERNEL);
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if (!gc_rq)
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goto fail_free_lba_list;
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nr_secs = 0;
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do {
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bit = find_next_zero_bit(invalid_bitmap, lm->sec_per_line,
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bit + 1);
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if (bit > line->emeta_ssec)
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break;
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gc_rq->paddr_list[nr_secs] = bit;
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gc_rq->lba_list[nr_secs++] = le64_to_cpu(lba_list[bit]);
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} while (nr_secs < pblk->max_write_pgs);
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if (unlikely(!nr_secs)) {
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kfree(gc_rq);
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goto out;
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}
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gc_rq->nr_secs = nr_secs;
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gc_rq->line = line;
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gc_rq->data = vmalloc(array_size(gc_rq->nr_secs, geo->csecs));
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if (!gc_rq->data)
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goto fail_free_gc_rq;
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gc_rq_ws = kmalloc(sizeof(struct pblk_line_ws), GFP_KERNEL);
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if (!gc_rq_ws)
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goto fail_free_gc_data;
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gc_rq_ws->pblk = pblk;
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gc_rq_ws->line = line;
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gc_rq_ws->priv = gc_rq;
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/* The write GC path can be much slower than the read GC one due to
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* the budget imposed by the rate-limiter. Balance in case that we get
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* back pressure from the write GC path.
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*/
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while (down_timeout(&gc->gc_sem, msecs_to_jiffies(30000)))
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io_schedule();
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kref_get(&line->ref);
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INIT_WORK(&gc_rq_ws->ws, pblk_gc_line_ws);
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queue_work(gc->gc_line_reader_wq, &gc_rq_ws->ws);
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sec_left -= nr_secs;
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if (sec_left > 0)
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goto next_rq;
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out:
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kvfree(lba_list);
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kfree(line_ws);
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kfree(invalid_bitmap);
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kref_put(&line->ref, pblk_line_put);
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atomic_dec(&gc->read_inflight_gc);
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return;
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fail_free_gc_data:
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vfree(gc_rq->data);
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fail_free_gc_rq:
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kfree(gc_rq);
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fail_free_lba_list:
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kvfree(lba_list);
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fail_free_invalid_bitmap:
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kfree(invalid_bitmap);
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fail_free_ws:
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kfree(line_ws);
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/* Line goes back to closed state, so we cannot release additional
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* reference for line, since we do that only when we want to do
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* gc to free line state transition.
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*/
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pblk_put_line_back(pblk, line);
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atomic_dec(&gc->read_inflight_gc);
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pblk_err(pblk, "failed to GC line %d\n", line->id);
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}
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static int pblk_gc_line(struct pblk *pblk, struct pblk_line *line)
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{
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struct pblk_gc *gc = &pblk->gc;
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struct pblk_line_ws *line_ws;
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pblk_debug(pblk, "line '%d' being reclaimed for GC\n", line->id);
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line_ws = kmalloc(sizeof(struct pblk_line_ws), GFP_KERNEL);
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if (!line_ws)
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return -ENOMEM;
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line_ws->pblk = pblk;
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line_ws->line = line;
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atomic_inc(&gc->pipeline_gc);
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INIT_WORK(&line_ws->ws, pblk_gc_line_prepare_ws);
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queue_work(gc->gc_reader_wq, &line_ws->ws);
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return 0;
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}
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static void pblk_gc_reader_kick(struct pblk_gc *gc)
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{
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wake_up_process(gc->gc_reader_ts);
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}
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static void pblk_gc_kick(struct pblk *pblk)
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{
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struct pblk_gc *gc = &pblk->gc;
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pblk_gc_writer_kick(gc);
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pblk_gc_reader_kick(gc);
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/* If we're shutting down GC, let's not start it up again */
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if (gc->gc_enabled) {
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wake_up_process(gc->gc_ts);
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mod_timer(&gc->gc_timer,
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jiffies + msecs_to_jiffies(GC_TIME_MSECS));
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}
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}
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static int pblk_gc_read(struct pblk *pblk)
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{
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struct pblk_gc *gc = &pblk->gc;
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struct pblk_line *line;
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spin_lock(&gc->r_lock);
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if (list_empty(&gc->r_list)) {
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spin_unlock(&gc->r_lock);
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return 1;
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}
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line = list_first_entry(&gc->r_list, struct pblk_line, list);
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list_del(&line->list);
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spin_unlock(&gc->r_lock);
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pblk_gc_kick(pblk);
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if (pblk_gc_line(pblk, line)) {
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pblk_err(pblk, "failed to GC line %d\n", line->id);
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/* rollback */
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spin_lock(&gc->r_lock);
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list_add_tail(&line->list, &gc->r_list);
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spin_unlock(&gc->r_lock);
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}
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return 0;
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}
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static struct pblk_line *pblk_gc_get_victim_line(struct pblk *pblk,
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struct list_head *group_list)
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{
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struct pblk_line *line, *victim;
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unsigned int line_vsc = ~0x0L, victim_vsc = ~0x0L;
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victim = list_first_entry(group_list, struct pblk_line, list);
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list_for_each_entry(line, group_list, list) {
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if (!atomic_read(&line->sec_to_update))
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line_vsc = le32_to_cpu(*line->vsc);
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if (line_vsc < victim_vsc) {
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victim = line;
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victim_vsc = le32_to_cpu(*victim->vsc);
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}
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}
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if (victim_vsc == ~0x0)
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return NULL;
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return victim;
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}
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static bool pblk_gc_should_run(struct pblk_gc *gc, struct pblk_rl *rl)
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{
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unsigned int nr_blocks_free, nr_blocks_need;
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unsigned int werr_lines = atomic_read(&rl->werr_lines);
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nr_blocks_need = pblk_rl_high_thrs(rl);
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nr_blocks_free = pblk_rl_nr_free_blks(rl);
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/* This is not critical, no need to take lock here */
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return ((werr_lines > 0) ||
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((gc->gc_active) && (nr_blocks_need > nr_blocks_free)));
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}
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void pblk_gc_free_full_lines(struct pblk *pblk)
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{
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struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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struct pblk_gc *gc = &pblk->gc;
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struct pblk_line *line;
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do {
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spin_lock(&l_mg->gc_lock);
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if (list_empty(&l_mg->gc_full_list)) {
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spin_unlock(&l_mg->gc_lock);
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return;
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}
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line = list_first_entry(&l_mg->gc_full_list,
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struct pblk_line, list);
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spin_lock(&line->lock);
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WARN_ON(line->state != PBLK_LINESTATE_CLOSED);
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line->state = PBLK_LINESTATE_GC;
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trace_pblk_line_state(pblk_disk_name(pblk), line->id,
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line->state);
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spin_unlock(&line->lock);
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list_del(&line->list);
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spin_unlock(&l_mg->gc_lock);
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atomic_inc(&gc->pipeline_gc);
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kref_put(&line->ref, pblk_line_put);
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} while (1);
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}
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/*
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* Lines with no valid sectors will be returned to the free list immediately. If
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* GC is activated - either because the free block count is under the determined
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* threshold, or because it is being forced from user space - only lines with a
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* high count of invalid sectors will be recycled.
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*/
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static void pblk_gc_run(struct pblk *pblk)
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{
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struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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struct pblk_gc *gc = &pblk->gc;
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struct pblk_line *line;
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struct list_head *group_list;
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bool run_gc;
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int read_inflight_gc, gc_group = 0, prev_group = 0;
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pblk_gc_free_full_lines(pblk);
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run_gc = pblk_gc_should_run(&pblk->gc, &pblk->rl);
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if (!run_gc || (atomic_read(&gc->read_inflight_gc) >= PBLK_GC_L_QD))
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return;
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next_gc_group:
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group_list = l_mg->gc_lists[gc_group++];
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do {
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spin_lock(&l_mg->gc_lock);
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line = pblk_gc_get_victim_line(pblk, group_list);
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if (!line) {
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spin_unlock(&l_mg->gc_lock);
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break;
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}
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spin_lock(&line->lock);
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WARN_ON(line->state != PBLK_LINESTATE_CLOSED);
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line->state = PBLK_LINESTATE_GC;
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trace_pblk_line_state(pblk_disk_name(pblk), line->id,
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line->state);
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spin_unlock(&line->lock);
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list_del(&line->list);
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spin_unlock(&l_mg->gc_lock);
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spin_lock(&gc->r_lock);
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list_add_tail(&line->list, &gc->r_list);
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spin_unlock(&gc->r_lock);
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read_inflight_gc = atomic_inc_return(&gc->read_inflight_gc);
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pblk_gc_reader_kick(gc);
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prev_group = 1;
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|
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/* No need to queue up more GC lines than we can handle */
|
|
run_gc = pblk_gc_should_run(&pblk->gc, &pblk->rl);
|
|
if (!run_gc || read_inflight_gc >= PBLK_GC_L_QD)
|
|
break;
|
|
} while (1);
|
|
|
|
if (!prev_group && pblk->rl.rb_state > gc_group &&
|
|
gc_group < PBLK_GC_NR_LISTS)
|
|
goto next_gc_group;
|
|
}
|
|
|
|
static void pblk_gc_timer(struct timer_list *t)
|
|
{
|
|
struct pblk *pblk = from_timer(pblk, t, gc.gc_timer);
|
|
|
|
pblk_gc_kick(pblk);
|
|
}
|
|
|
|
static int pblk_gc_ts(void *data)
|
|
{
|
|
struct pblk *pblk = data;
|
|
|
|
while (!kthread_should_stop()) {
|
|
pblk_gc_run(pblk);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
io_schedule();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pblk_gc_writer_ts(void *data)
|
|
{
|
|
struct pblk *pblk = data;
|
|
|
|
while (!kthread_should_stop()) {
|
|
if (!pblk_gc_write(pblk))
|
|
continue;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
io_schedule();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pblk_gc_reader_ts(void *data)
|
|
{
|
|
struct pblk *pblk = data;
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
|
|
while (!kthread_should_stop()) {
|
|
if (!pblk_gc_read(pblk))
|
|
continue;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
io_schedule();
|
|
}
|
|
|
|
#ifdef CONFIG_NVM_PBLK_DEBUG
|
|
pblk_info(pblk, "flushing gc pipeline, %d lines left\n",
|
|
atomic_read(&gc->pipeline_gc));
|
|
#endif
|
|
|
|
do {
|
|
if (!atomic_read(&gc->pipeline_gc))
|
|
break;
|
|
|
|
schedule();
|
|
} while (1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pblk_gc_start(struct pblk *pblk)
|
|
{
|
|
pblk->gc.gc_active = 1;
|
|
pblk_debug(pblk, "gc start\n");
|
|
}
|
|
|
|
void pblk_gc_should_start(struct pblk *pblk)
|
|
{
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
|
|
if (gc->gc_enabled && !gc->gc_active) {
|
|
pblk_gc_start(pblk);
|
|
pblk_gc_kick(pblk);
|
|
}
|
|
}
|
|
|
|
void pblk_gc_should_stop(struct pblk *pblk)
|
|
{
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
|
|
if (gc->gc_active && !gc->gc_forced)
|
|
gc->gc_active = 0;
|
|
}
|
|
|
|
void pblk_gc_should_kick(struct pblk *pblk)
|
|
{
|
|
pblk_rl_update_rates(&pblk->rl);
|
|
}
|
|
|
|
void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled,
|
|
int *gc_active)
|
|
{
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
|
|
spin_lock(&gc->lock);
|
|
*gc_enabled = gc->gc_enabled;
|
|
*gc_active = gc->gc_active;
|
|
spin_unlock(&gc->lock);
|
|
}
|
|
|
|
int pblk_gc_sysfs_force(struct pblk *pblk, int force)
|
|
{
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
|
|
if (force < 0 || force > 1)
|
|
return -EINVAL;
|
|
|
|
spin_lock(&gc->lock);
|
|
gc->gc_forced = force;
|
|
|
|
if (force)
|
|
gc->gc_enabled = 1;
|
|
else
|
|
gc->gc_enabled = 0;
|
|
spin_unlock(&gc->lock);
|
|
|
|
pblk_gc_should_start(pblk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pblk_gc_init(struct pblk *pblk)
|
|
{
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
int ret;
|
|
|
|
gc->gc_ts = kthread_create(pblk_gc_ts, pblk, "pblk-gc-ts");
|
|
if (IS_ERR(gc->gc_ts)) {
|
|
pblk_err(pblk, "could not allocate GC main kthread\n");
|
|
return PTR_ERR(gc->gc_ts);
|
|
}
|
|
|
|
gc->gc_writer_ts = kthread_create(pblk_gc_writer_ts, pblk,
|
|
"pblk-gc-writer-ts");
|
|
if (IS_ERR(gc->gc_writer_ts)) {
|
|
pblk_err(pblk, "could not allocate GC writer kthread\n");
|
|
ret = PTR_ERR(gc->gc_writer_ts);
|
|
goto fail_free_main_kthread;
|
|
}
|
|
|
|
gc->gc_reader_ts = kthread_create(pblk_gc_reader_ts, pblk,
|
|
"pblk-gc-reader-ts");
|
|
if (IS_ERR(gc->gc_reader_ts)) {
|
|
pblk_err(pblk, "could not allocate GC reader kthread\n");
|
|
ret = PTR_ERR(gc->gc_reader_ts);
|
|
goto fail_free_writer_kthread;
|
|
}
|
|
|
|
timer_setup(&gc->gc_timer, pblk_gc_timer, 0);
|
|
mod_timer(&gc->gc_timer, jiffies + msecs_to_jiffies(GC_TIME_MSECS));
|
|
|
|
gc->gc_active = 0;
|
|
gc->gc_forced = 0;
|
|
gc->gc_enabled = 1;
|
|
gc->w_entries = 0;
|
|
atomic_set(&gc->read_inflight_gc, 0);
|
|
atomic_set(&gc->pipeline_gc, 0);
|
|
|
|
/* Workqueue that reads valid sectors from a line and submit them to the
|
|
* GC writer to be recycled.
|
|
*/
|
|
gc->gc_line_reader_wq = alloc_workqueue("pblk-gc-line-reader-wq",
|
|
WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_GC_MAX_READERS);
|
|
if (!gc->gc_line_reader_wq) {
|
|
pblk_err(pblk, "could not allocate GC line reader workqueue\n");
|
|
ret = -ENOMEM;
|
|
goto fail_free_reader_kthread;
|
|
}
|
|
|
|
/* Workqueue that prepare lines for GC */
|
|
gc->gc_reader_wq = alloc_workqueue("pblk-gc-line_wq",
|
|
WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
|
|
if (!gc->gc_reader_wq) {
|
|
pblk_err(pblk, "could not allocate GC reader workqueue\n");
|
|
ret = -ENOMEM;
|
|
goto fail_free_reader_line_wq;
|
|
}
|
|
|
|
spin_lock_init(&gc->lock);
|
|
spin_lock_init(&gc->w_lock);
|
|
spin_lock_init(&gc->r_lock);
|
|
|
|
sema_init(&gc->gc_sem, PBLK_GC_RQ_QD);
|
|
|
|
INIT_LIST_HEAD(&gc->w_list);
|
|
INIT_LIST_HEAD(&gc->r_list);
|
|
|
|
return 0;
|
|
|
|
fail_free_reader_line_wq:
|
|
destroy_workqueue(gc->gc_line_reader_wq);
|
|
fail_free_reader_kthread:
|
|
kthread_stop(gc->gc_reader_ts);
|
|
fail_free_writer_kthread:
|
|
kthread_stop(gc->gc_writer_ts);
|
|
fail_free_main_kthread:
|
|
kthread_stop(gc->gc_ts);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void pblk_gc_exit(struct pblk *pblk, bool graceful)
|
|
{
|
|
struct pblk_gc *gc = &pblk->gc;
|
|
|
|
gc->gc_enabled = 0;
|
|
del_timer_sync(&gc->gc_timer);
|
|
gc->gc_active = 0;
|
|
|
|
if (gc->gc_ts)
|
|
kthread_stop(gc->gc_ts);
|
|
|
|
if (gc->gc_reader_ts)
|
|
kthread_stop(gc->gc_reader_ts);
|
|
|
|
if (graceful) {
|
|
flush_workqueue(gc->gc_reader_wq);
|
|
flush_workqueue(gc->gc_line_reader_wq);
|
|
}
|
|
|
|
destroy_workqueue(gc->gc_reader_wq);
|
|
destroy_workqueue(gc->gc_line_reader_wq);
|
|
|
|
if (gc->gc_writer_ts)
|
|
kthread_stop(gc->gc_writer_ts);
|
|
}
|