![Javier González](/assets/img/avatar_default.png)
The number of ppas contained on a request is not necessarily the number of pages that it maps to neither on the target nor on the device side. In order to avoid confusion, rename nr_pages to nr_ppas since it is what the variable actually contains. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
572 lines
13 KiB
C
572 lines
13 KiB
C
/*
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* Copyright (C) 2015 Matias Bjorling <m@bjorling.me>
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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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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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* Implementation of a generic nvm manager for Open-Channel SSDs.
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*/
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#include "gennvm.h"
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static int gennvm_get_area(struct nvm_dev *dev, sector_t *lba, sector_t len)
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{
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struct gen_nvm *gn = dev->mp;
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struct gennvm_area *area, *prev, *next;
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sector_t begin = 0;
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sector_t max_sectors = (dev->sec_size * dev->total_secs) >> 9;
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if (len > max_sectors)
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return -EINVAL;
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area = kmalloc(sizeof(struct gennvm_area), GFP_KERNEL);
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if (!area)
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return -ENOMEM;
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prev = NULL;
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spin_lock(&dev->lock);
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list_for_each_entry(next, &gn->area_list, list) {
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if (begin + len > next->begin) {
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begin = next->end;
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prev = next;
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continue;
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}
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break;
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}
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if ((begin + len) > max_sectors) {
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spin_unlock(&dev->lock);
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kfree(area);
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return -EINVAL;
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}
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area->begin = *lba = begin;
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area->end = begin + len;
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if (prev) /* insert into sorted order */
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list_add(&area->list, &prev->list);
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else
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list_add(&area->list, &gn->area_list);
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spin_unlock(&dev->lock);
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return 0;
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}
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static void gennvm_put_area(struct nvm_dev *dev, sector_t begin)
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{
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struct gen_nvm *gn = dev->mp;
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struct gennvm_area *area;
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spin_lock(&dev->lock);
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list_for_each_entry(area, &gn->area_list, list) {
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if (area->begin != begin)
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continue;
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list_del(&area->list);
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spin_unlock(&dev->lock);
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kfree(area);
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return;
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}
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spin_unlock(&dev->lock);
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}
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static void gennvm_blocks_free(struct nvm_dev *dev)
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{
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struct gen_nvm *gn = dev->mp;
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struct gen_lun *lun;
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int i;
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gennvm_for_each_lun(gn, lun, i) {
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if (!lun->vlun.blocks)
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break;
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vfree(lun->vlun.blocks);
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}
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}
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static void gennvm_luns_free(struct nvm_dev *dev)
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{
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struct gen_nvm *gn = dev->mp;
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kfree(gn->luns);
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}
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static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn)
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{
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struct gen_lun *lun;
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int i;
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gn->luns = kcalloc(dev->nr_luns, sizeof(struct gen_lun), GFP_KERNEL);
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if (!gn->luns)
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return -ENOMEM;
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gennvm_for_each_lun(gn, lun, i) {
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spin_lock_init(&lun->vlun.lock);
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INIT_LIST_HEAD(&lun->free_list);
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INIT_LIST_HEAD(&lun->used_list);
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INIT_LIST_HEAD(&lun->bb_list);
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lun->reserved_blocks = 2; /* for GC only */
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lun->vlun.id = i;
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lun->vlun.lun_id = i % dev->luns_per_chnl;
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lun->vlun.chnl_id = i / dev->luns_per_chnl;
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lun->vlun.nr_free_blocks = dev->blks_per_lun;
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lun->vlun.nr_open_blocks = 0;
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lun->vlun.nr_closed_blocks = 0;
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lun->vlun.nr_bad_blocks = 0;
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}
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return 0;
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}
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static int gennvm_block_bb(struct gen_nvm *gn, struct ppa_addr ppa,
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u8 *blks, int nr_blks)
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{
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struct nvm_dev *dev = gn->dev;
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struct gen_lun *lun;
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struct nvm_block *blk;
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int i;
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nr_blks = nvm_bb_tbl_fold(dev, blks, nr_blks);
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if (nr_blks < 0)
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return nr_blks;
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lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
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for (i = 0; i < nr_blks; i++) {
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if (blks[i] == 0)
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continue;
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blk = &lun->vlun.blocks[i];
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list_move_tail(&blk->list, &lun->bb_list);
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lun->vlun.nr_bad_blocks++;
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lun->vlun.nr_free_blocks--;
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}
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return 0;
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}
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static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
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{
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struct nvm_dev *dev = private;
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struct gen_nvm *gn = dev->mp;
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u64 elba = slba + nlb;
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struct gen_lun *lun;
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struct nvm_block *blk;
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u64 i;
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int lun_id;
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if (unlikely(elba > dev->total_secs)) {
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pr_err("gennvm: L2P data from device is out of bounds!\n");
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return -EINVAL;
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}
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for (i = 0; i < nlb; i++) {
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u64 pba = le64_to_cpu(entries[i]);
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if (unlikely(pba >= dev->total_secs && pba != U64_MAX)) {
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pr_err("gennvm: L2P data entry is out of bounds!\n");
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return -EINVAL;
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}
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/* Address zero is a special one. The first page on a disk is
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* protected. It often holds internal device boot
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* information.
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*/
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if (!pba)
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continue;
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/* resolve block from physical address */
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lun_id = div_u64(pba, dev->sec_per_lun);
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lun = &gn->luns[lun_id];
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/* Calculate block offset into lun */
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pba = pba - (dev->sec_per_lun * lun_id);
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blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];
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if (!blk->state) {
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/* at this point, we don't know anything about the
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* block. It's up to the FTL on top to re-etablish the
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* block state. The block is assumed to be open.
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*/
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list_move_tail(&blk->list, &lun->used_list);
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blk->state = NVM_BLK_ST_OPEN;
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lun->vlun.nr_free_blocks--;
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lun->vlun.nr_open_blocks++;
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}
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}
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return 0;
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}
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static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
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{
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struct gen_lun *lun;
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struct nvm_block *block;
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sector_t lun_iter, blk_iter, cur_block_id = 0;
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int ret, nr_blks;
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u8 *blks;
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nr_blks = dev->blks_per_lun * dev->plane_mode;
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blks = kmalloc(nr_blks, GFP_KERNEL);
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if (!blks)
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return -ENOMEM;
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gennvm_for_each_lun(gn, lun, lun_iter) {
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lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) *
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dev->blks_per_lun);
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if (!lun->vlun.blocks) {
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kfree(blks);
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return -ENOMEM;
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}
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for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) {
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block = &lun->vlun.blocks[blk_iter];
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INIT_LIST_HEAD(&block->list);
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block->lun = &lun->vlun;
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block->id = cur_block_id++;
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/* First block is reserved for device */
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if (unlikely(lun_iter == 0 && blk_iter == 0)) {
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lun->vlun.nr_free_blocks--;
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continue;
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}
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list_add_tail(&block->list, &lun->free_list);
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}
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if (dev->ops->get_bb_tbl) {
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struct ppa_addr ppa;
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ppa.ppa = 0;
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ppa.g.ch = lun->vlun.chnl_id;
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ppa.g.lun = lun->vlun.lun_id;
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ret = nvm_get_bb_tbl(dev, ppa, blks);
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if (ret)
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pr_err("gennvm: could not get BB table\n");
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ret = gennvm_block_bb(gn, ppa, blks, nr_blks);
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if (ret)
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pr_err("gennvm: BB table map failed\n");
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}
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}
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if ((dev->identity.dom & NVM_RSP_L2P) && dev->ops->get_l2p_tbl) {
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ret = dev->ops->get_l2p_tbl(dev, 0, dev->total_secs,
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gennvm_block_map, dev);
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if (ret) {
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pr_err("gennvm: could not read L2P table.\n");
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pr_warn("gennvm: default block initialization");
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}
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}
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kfree(blks);
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return 0;
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}
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static void gennvm_free(struct nvm_dev *dev)
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{
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gennvm_blocks_free(dev);
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gennvm_luns_free(dev);
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kfree(dev->mp);
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dev->mp = NULL;
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}
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static int gennvm_register(struct nvm_dev *dev)
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{
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struct gen_nvm *gn;
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int ret;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL);
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if (!gn)
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return -ENOMEM;
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gn->dev = dev;
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gn->nr_luns = dev->nr_luns;
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INIT_LIST_HEAD(&gn->area_list);
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dev->mp = gn;
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ret = gennvm_luns_init(dev, gn);
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if (ret) {
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pr_err("gennvm: could not initialize luns\n");
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goto err;
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}
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ret = gennvm_blocks_init(dev, gn);
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if (ret) {
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pr_err("gennvm: could not initialize blocks\n");
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goto err;
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}
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return 1;
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err:
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gennvm_free(dev);
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module_put(THIS_MODULE);
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return ret;
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}
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static void gennvm_unregister(struct nvm_dev *dev)
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{
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gennvm_free(dev);
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module_put(THIS_MODULE);
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}
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static struct nvm_block *gennvm_get_blk_unlocked(struct nvm_dev *dev,
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struct nvm_lun *vlun, unsigned long flags)
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{
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struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
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struct nvm_block *blk = NULL;
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int is_gc = flags & NVM_IOTYPE_GC;
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assert_spin_locked(&vlun->lock);
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if (list_empty(&lun->free_list)) {
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pr_err_ratelimited("gennvm: lun %u have no free pages available",
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lun->vlun.id);
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goto out;
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}
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if (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks)
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goto out;
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blk = list_first_entry(&lun->free_list, struct nvm_block, list);
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list_move_tail(&blk->list, &lun->used_list);
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blk->state = NVM_BLK_ST_OPEN;
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lun->vlun.nr_free_blocks--;
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lun->vlun.nr_open_blocks++;
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out:
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return blk;
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}
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static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
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struct nvm_lun *vlun, unsigned long flags)
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{
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struct nvm_block *blk;
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spin_lock(&vlun->lock);
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blk = gennvm_get_blk_unlocked(dev, vlun, flags);
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spin_unlock(&vlun->lock);
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return blk;
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}
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static void gennvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk)
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{
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struct nvm_lun *vlun = blk->lun;
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struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
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assert_spin_locked(&vlun->lock);
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if (blk->state & NVM_BLK_ST_OPEN) {
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list_move_tail(&blk->list, &lun->free_list);
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lun->vlun.nr_open_blocks--;
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lun->vlun.nr_free_blocks++;
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blk->state = NVM_BLK_ST_FREE;
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} else if (blk->state & NVM_BLK_ST_CLOSED) {
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list_move_tail(&blk->list, &lun->free_list);
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lun->vlun.nr_closed_blocks--;
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lun->vlun.nr_free_blocks++;
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blk->state = NVM_BLK_ST_FREE;
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} else if (blk->state & NVM_BLK_ST_BAD) {
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list_move_tail(&blk->list, &lun->bb_list);
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lun->vlun.nr_bad_blocks++;
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blk->state = NVM_BLK_ST_BAD;
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} else {
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WARN_ON_ONCE(1);
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pr_err("gennvm: erroneous block type (%lu -> %u)\n",
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blk->id, blk->state);
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list_move_tail(&blk->list, &lun->bb_list);
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lun->vlun.nr_bad_blocks++;
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blk->state = NVM_BLK_ST_BAD;
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}
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}
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static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
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{
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struct nvm_lun *vlun = blk->lun;
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spin_lock(&vlun->lock);
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gennvm_put_blk_unlocked(dev, blk);
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spin_unlock(&vlun->lock);
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}
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static void gennvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
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{
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struct gen_nvm *gn = dev->mp;
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struct gen_lun *lun;
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struct nvm_block *blk;
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pr_debug("gennvm: ppa (ch: %u lun: %u blk: %u pg: %u) -> %u\n",
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ppa.g.ch, ppa.g.lun, ppa.g.blk, ppa.g.pg, type);
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if (unlikely(ppa.g.ch > dev->nr_chnls ||
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ppa.g.lun > dev->luns_per_chnl ||
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ppa.g.blk > dev->blks_per_lun)) {
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WARN_ON_ONCE(1);
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pr_err("gennvm: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u",
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ppa.g.ch, dev->nr_chnls,
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ppa.g.lun, dev->luns_per_chnl,
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ppa.g.blk, dev->blks_per_lun);
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return;
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}
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lun = &gn->luns[ppa.g.lun * ppa.g.ch];
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blk = &lun->vlun.blocks[ppa.g.blk];
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/* will be moved to bb list on put_blk from target */
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blk->state = type;
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}
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/*
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* mark block bad in gennvm. It is expected that the target recovers separately
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*/
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static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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int bit = -1;
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int max_secs = dev->ops->max_phys_sect;
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void *comp_bits = &rqd->ppa_status;
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nvm_addr_to_generic_mode(dev, rqd);
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/* look up blocks and mark them as bad */
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if (rqd->nr_ppas == 1) {
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gennvm_mark_blk(dev, rqd->ppa_addr, NVM_BLK_ST_BAD);
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return;
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}
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while ((bit = find_next_bit(comp_bits, max_secs, bit + 1)) < max_secs)
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gennvm_mark_blk(dev, rqd->ppa_list[bit], NVM_BLK_ST_BAD);
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}
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static void gennvm_end_io(struct nvm_rq *rqd)
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{
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struct nvm_tgt_instance *ins = rqd->ins;
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if (rqd->error == NVM_RSP_ERR_FAILWRITE)
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gennvm_mark_blk_bad(rqd->dev, rqd);
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ins->tt->end_io(rqd);
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}
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static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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if (!dev->ops->submit_io)
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return -ENODEV;
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/* Convert address space */
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nvm_generic_to_addr_mode(dev, rqd);
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rqd->dev = dev;
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rqd->end_io = gennvm_end_io;
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return dev->ops->submit_io(dev, rqd);
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}
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static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
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unsigned long flags)
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{
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struct ppa_addr addr = block_to_ppa(dev, blk);
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return nvm_erase_ppa(dev, &addr, 1);
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}
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static int gennvm_reserve_lun(struct nvm_dev *dev, int lunid)
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{
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return test_and_set_bit(lunid, dev->lun_map);
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}
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static void gennvm_release_lun(struct nvm_dev *dev, int lunid)
|
|
{
|
|
WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
|
|
}
|
|
|
|
static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
|
|
{
|
|
struct gen_nvm *gn = dev->mp;
|
|
|
|
if (unlikely(lunid >= dev->nr_luns))
|
|
return NULL;
|
|
|
|
return &gn->luns[lunid].vlun;
|
|
}
|
|
|
|
static void gennvm_lun_info_print(struct nvm_dev *dev)
|
|
{
|
|
struct gen_nvm *gn = dev->mp;
|
|
struct gen_lun *lun;
|
|
unsigned int i;
|
|
|
|
|
|
gennvm_for_each_lun(gn, lun, i) {
|
|
spin_lock(&lun->vlun.lock);
|
|
|
|
pr_info("%s: lun%8u\t%u\t%u\t%u\t%u\n",
|
|
dev->name, i,
|
|
lun->vlun.nr_free_blocks,
|
|
lun->vlun.nr_open_blocks,
|
|
lun->vlun.nr_closed_blocks,
|
|
lun->vlun.nr_bad_blocks);
|
|
|
|
spin_unlock(&lun->vlun.lock);
|
|
}
|
|
}
|
|
|
|
static struct nvmm_type gennvm = {
|
|
.name = "gennvm",
|
|
.version = {0, 1, 0},
|
|
|
|
.register_mgr = gennvm_register,
|
|
.unregister_mgr = gennvm_unregister,
|
|
|
|
.get_blk_unlocked = gennvm_get_blk_unlocked,
|
|
.put_blk_unlocked = gennvm_put_blk_unlocked,
|
|
|
|
.get_blk = gennvm_get_blk,
|
|
.put_blk = gennvm_put_blk,
|
|
|
|
.submit_io = gennvm_submit_io,
|
|
.erase_blk = gennvm_erase_blk,
|
|
|
|
.mark_blk = gennvm_mark_blk,
|
|
|
|
.get_lun = gennvm_get_lun,
|
|
.reserve_lun = gennvm_reserve_lun,
|
|
.release_lun = gennvm_release_lun,
|
|
.lun_info_print = gennvm_lun_info_print,
|
|
|
|
.get_area = gennvm_get_area,
|
|
.put_area = gennvm_put_area,
|
|
|
|
};
|
|
|
|
static int __init gennvm_module_init(void)
|
|
{
|
|
return nvm_register_mgr(&gennvm);
|
|
}
|
|
|
|
static void gennvm_module_exit(void)
|
|
{
|
|
nvm_unregister_mgr(&gennvm);
|
|
}
|
|
|
|
module_init(gennvm_module_init);
|
|
module_exit(gennvm_module_exit);
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Generic media manager for Open-Channel SSDs");
|