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![Javier González](/assets/img/avatar_default.png)
Since targets are given a virtual target device, it is necessary to translate all communication between targets and the backend device. Implement the translation layer for get/set bad block table. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
657 lines
14 KiB
C
657 lines
14 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 general nvm manager for Open-Channel SSDs.
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*/
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#include "gennvm.h"
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static struct nvm_target *gen_find_target(struct gen_dev *gn, const char *name)
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{
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struct nvm_target *tgt;
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list_for_each_entry(tgt, &gn->targets, list)
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if (!strcmp(name, tgt->disk->disk_name))
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return tgt;
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return NULL;
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}
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static const struct block_device_operations gen_fops = {
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.owner = THIS_MODULE,
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};
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static int gen_reserve_luns(struct nvm_dev *dev, struct nvm_target *t,
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int lun_begin, int lun_end)
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{
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int i;
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for (i = lun_begin; i <= lun_end; i++) {
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if (test_and_set_bit(i, dev->lun_map)) {
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pr_err("nvm: lun %d already allocated\n", i);
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goto err;
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}
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}
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return 0;
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err:
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while (--i > lun_begin)
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clear_bit(i, dev->lun_map);
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return -EBUSY;
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}
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static void gen_release_luns_err(struct nvm_dev *dev, int lun_begin,
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int lun_end)
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{
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int i;
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for (i = lun_begin; i <= lun_end; i++)
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WARN_ON(!test_and_clear_bit(i, dev->lun_map));
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}
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static void gen_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev)
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{
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struct nvm_dev *dev = tgt_dev->parent;
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struct gen_dev_map *dev_map = tgt_dev->map;
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int i, j;
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for (i = 0; i < dev_map->nr_chnls; i++) {
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struct gen_ch_map *ch_map = &dev_map->chnls[i];
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int *lun_offs = ch_map->lun_offs;
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int ch = i + ch_map->ch_off;
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for (j = 0; j < ch_map->nr_luns; j++) {
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int lun = j + lun_offs[j];
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int lunid = (ch * dev->geo.luns_per_chnl) + lun;
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WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
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}
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kfree(ch_map->lun_offs);
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}
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kfree(dev_map->chnls);
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kfree(dev_map);
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kfree(tgt_dev->luns);
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kfree(tgt_dev);
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}
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static struct nvm_tgt_dev *gen_create_tgt_dev(struct nvm_dev *dev,
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int lun_begin, int lun_end)
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{
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struct nvm_tgt_dev *tgt_dev = NULL;
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struct gen_dev_map *dev_rmap = dev->rmap;
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struct gen_dev_map *dev_map;
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struct ppa_addr *luns;
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int nr_luns = lun_end - lun_begin + 1;
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int luns_left = nr_luns;
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int nr_chnls = nr_luns / dev->geo.luns_per_chnl;
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int nr_chnls_mod = nr_luns % dev->geo.luns_per_chnl;
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int bch = lun_begin / dev->geo.luns_per_chnl;
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int blun = lun_begin % dev->geo.luns_per_chnl;
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int lunid = 0;
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int lun_balanced = 1;
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int prev_nr_luns;
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int i, j;
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nr_chnls = nr_luns / dev->geo.luns_per_chnl;
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nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1;
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dev_map = kmalloc(sizeof(struct gen_dev_map), GFP_KERNEL);
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if (!dev_map)
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goto err_dev;
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dev_map->chnls = kcalloc(nr_chnls, sizeof(struct gen_ch_map),
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GFP_KERNEL);
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if (!dev_map->chnls)
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goto err_chnls;
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luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL);
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if (!luns)
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goto err_luns;
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prev_nr_luns = (luns_left > dev->geo.luns_per_chnl) ?
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dev->geo.luns_per_chnl : luns_left;
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for (i = 0; i < nr_chnls; i++) {
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struct gen_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
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int *lun_roffs = ch_rmap->lun_offs;
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struct gen_ch_map *ch_map = &dev_map->chnls[i];
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int *lun_offs;
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int luns_in_chnl = (luns_left > dev->geo.luns_per_chnl) ?
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dev->geo.luns_per_chnl : luns_left;
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if (lun_balanced && prev_nr_luns != luns_in_chnl)
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lun_balanced = 0;
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ch_map->ch_off = ch_rmap->ch_off = bch;
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ch_map->nr_luns = luns_in_chnl;
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lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
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if (!lun_offs)
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goto err_ch;
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for (j = 0; j < luns_in_chnl; j++) {
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luns[lunid].ppa = 0;
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luns[lunid].g.ch = i;
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luns[lunid++].g.lun = j;
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lun_offs[j] = blun;
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lun_roffs[j + blun] = blun;
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}
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ch_map->lun_offs = lun_offs;
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/* when starting a new channel, lun offset is reset */
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blun = 0;
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luns_left -= luns_in_chnl;
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}
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dev_map->nr_chnls = nr_chnls;
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tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
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if (!tgt_dev)
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goto err_ch;
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memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
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/* Target device only owns a portion of the physical device */
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tgt_dev->geo.nr_chnls = nr_chnls;
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tgt_dev->geo.nr_luns = nr_luns;
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tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1;
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tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun;
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tgt_dev->q = dev->q;
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tgt_dev->map = dev_map;
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tgt_dev->luns = luns;
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memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id));
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tgt_dev->parent = dev;
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return tgt_dev;
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err_ch:
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while (--i > 0)
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kfree(dev_map->chnls[i].lun_offs);
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kfree(luns);
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err_luns:
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kfree(dev_map->chnls);
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err_chnls:
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kfree(dev_map);
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err_dev:
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return tgt_dev;
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}
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static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
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{
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struct gen_dev *gn = dev->mp;
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struct nvm_ioctl_create_simple *s = &create->conf.s;
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struct request_queue *tqueue;
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struct gendisk *tdisk;
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struct nvm_tgt_type *tt;
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struct nvm_target *t;
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struct nvm_tgt_dev *tgt_dev;
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void *targetdata;
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tt = nvm_find_target_type(create->tgttype, 1);
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if (!tt) {
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pr_err("nvm: target type %s not found\n", create->tgttype);
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return -EINVAL;
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}
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mutex_lock(&gn->lock);
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t = gen_find_target(gn, create->tgtname);
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if (t) {
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pr_err("nvm: target name already exists.\n");
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mutex_unlock(&gn->lock);
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return -EINVAL;
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}
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mutex_unlock(&gn->lock);
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t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
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if (!t)
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return -ENOMEM;
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if (gen_reserve_luns(dev, t, s->lun_begin, s->lun_end))
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goto err_t;
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tgt_dev = gen_create_tgt_dev(dev, s->lun_begin, s->lun_end);
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if (!tgt_dev) {
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pr_err("nvm: could not create target device\n");
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goto err_reserve;
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}
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tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
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if (!tqueue)
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goto err_dev;
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blk_queue_make_request(tqueue, tt->make_rq);
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tdisk = alloc_disk(0);
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if (!tdisk)
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goto err_queue;
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sprintf(tdisk->disk_name, "%s", create->tgtname);
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tdisk->flags = GENHD_FL_EXT_DEVT;
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tdisk->major = 0;
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tdisk->first_minor = 0;
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tdisk->fops = &gen_fops;
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tdisk->queue = tqueue;
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targetdata = tt->init(tgt_dev, tdisk);
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if (IS_ERR(targetdata))
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goto err_init;
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tdisk->private_data = targetdata;
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tqueue->queuedata = targetdata;
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blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
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set_capacity(tdisk, tt->capacity(targetdata));
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add_disk(tdisk);
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t->type = tt;
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t->disk = tdisk;
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t->dev = tgt_dev;
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mutex_lock(&gn->lock);
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list_add_tail(&t->list, &gn->targets);
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mutex_unlock(&gn->lock);
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return 0;
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err_init:
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put_disk(tdisk);
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err_queue:
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blk_cleanup_queue(tqueue);
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err_dev:
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kfree(tgt_dev);
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err_reserve:
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gen_release_luns_err(dev, s->lun_begin, s->lun_end);
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err_t:
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kfree(t);
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return -ENOMEM;
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}
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static void __gen_remove_target(struct nvm_target *t)
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{
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struct nvm_tgt_type *tt = t->type;
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struct gendisk *tdisk = t->disk;
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struct request_queue *q = tdisk->queue;
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del_gendisk(tdisk);
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blk_cleanup_queue(q);
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if (tt->exit)
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tt->exit(tdisk->private_data);
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gen_remove_tgt_dev(t->dev);
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put_disk(tdisk);
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list_del(&t->list);
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kfree(t);
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}
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/**
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* gen_remove_tgt - Removes a target from the media manager
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* @dev: device
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* @remove: ioctl structure with target name to remove.
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*
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* Returns:
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* 0: on success
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* 1: on not found
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* <0: on error
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*/
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static int gen_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
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{
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struct gen_dev *gn = dev->mp;
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struct nvm_target *t;
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if (!gn)
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return 1;
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mutex_lock(&gn->lock);
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t = gen_find_target(gn, remove->tgtname);
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if (!t) {
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mutex_unlock(&gn->lock);
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return 1;
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}
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__gen_remove_target(t);
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mutex_unlock(&gn->lock);
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return 0;
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}
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static int gen_get_area(struct nvm_dev *dev, sector_t *lba, sector_t len)
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{
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struct nvm_geo *geo = &dev->geo;
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struct gen_dev *gn = dev->mp;
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struct gen_area *area, *prev, *next;
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sector_t begin = 0;
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sector_t max_sectors = (geo->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 gen_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 gen_put_area(struct nvm_dev *dev, sector_t begin)
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{
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struct gen_dev *gn = dev->mp;
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struct gen_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 gen_free(struct nvm_dev *dev)
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{
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kfree(dev->mp);
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kfree(dev->rmap);
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dev->mp = NULL;
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}
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static int gen_register(struct nvm_dev *dev)
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{
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struct gen_dev *gn;
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struct gen_dev_map *dev_rmap;
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int i, j;
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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_dev), GFP_KERNEL);
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if (!gn)
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goto err_gn;
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dev_rmap = kmalloc(sizeof(struct gen_dev_map), GFP_KERNEL);
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if (!dev_rmap)
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goto err_rmap;
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dev_rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct gen_ch_map),
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GFP_KERNEL);
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if (!dev_rmap->chnls)
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goto err_chnls;
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for (i = 0; i < dev->geo.nr_chnls; i++) {
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struct gen_ch_map *ch_rmap;
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int *lun_roffs;
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int luns_in_chnl = dev->geo.luns_per_chnl;
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ch_rmap = &dev_rmap->chnls[i];
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ch_rmap->ch_off = -1;
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ch_rmap->nr_luns = luns_in_chnl;
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lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
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if (!lun_roffs)
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goto err_ch;
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for (j = 0; j < luns_in_chnl; j++)
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lun_roffs[j] = -1;
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ch_rmap->lun_offs = lun_roffs;
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}
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gn->dev = dev;
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gn->nr_luns = dev->geo.nr_luns;
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INIT_LIST_HEAD(&gn->area_list);
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mutex_init(&gn->lock);
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INIT_LIST_HEAD(&gn->targets);
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dev->mp = gn;
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dev->rmap = dev_rmap;
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return 1;
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err_ch:
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while (--i >= 0)
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kfree(dev_rmap->chnls[i].lun_offs);
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err_chnls:
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kfree(dev_rmap);
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err_rmap:
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gen_free(dev);
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err_gn:
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module_put(THIS_MODULE);
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return -ENOMEM;
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}
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static void gen_unregister(struct nvm_dev *dev)
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{
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struct gen_dev *gn = dev->mp;
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struct nvm_target *t, *tmp;
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mutex_lock(&gn->lock);
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list_for_each_entry_safe(t, tmp, &gn->targets, list) {
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if (t->dev->parent != dev)
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continue;
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__gen_remove_target(t);
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}
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mutex_unlock(&gn->lock);
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gen_free(dev);
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module_put(THIS_MODULE);
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}
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static int gen_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
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{
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struct gen_dev_map *dev_map = tgt_dev->map;
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struct gen_ch_map *ch_map = &dev_map->chnls[p->g.ch];
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int lun_off = ch_map->lun_offs[p->g.lun];
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struct nvm_dev *dev = tgt_dev->parent;
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struct gen_dev_map *dev_rmap = dev->rmap;
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struct gen_ch_map *ch_rmap;
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int lun_roff;
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p->g.ch += ch_map->ch_off;
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p->g.lun += lun_off;
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ch_rmap = &dev_rmap->chnls[p->g.ch];
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lun_roff = ch_rmap->lun_offs[p->g.lun];
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if (unlikely(ch_rmap->ch_off < 0 || lun_roff < 0)) {
|
|
pr_err("nvm: corrupted device partition table\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
|
|
{
|
|
struct nvm_dev *dev = tgt_dev->parent;
|
|
struct gen_dev_map *dev_rmap = dev->rmap;
|
|
struct gen_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
|
|
int lun_roff = ch_rmap->lun_offs[p->g.lun];
|
|
|
|
p->g.ch -= ch_rmap->ch_off;
|
|
p->g.lun -= lun_roff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen_trans_rq(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
|
|
int flag)
|
|
{
|
|
gen_trans_fn *f;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
f = (flag == TRANS_TGT_TO_DEV) ? gen_map_to_dev : gen_map_to_tgt;
|
|
|
|
if (rqd->nr_ppas == 1)
|
|
return f(tgt_dev, &rqd->ppa_addr);
|
|
|
|
for (i = 0; i < rqd->nr_ppas; i++) {
|
|
ret = f(tgt_dev, &rqd->ppa_list[i]);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void gen_end_io(struct nvm_rq *rqd)
|
|
{
|
|
struct nvm_tgt_dev *tgt_dev = rqd->dev;
|
|
struct nvm_tgt_instance *ins = rqd->ins;
|
|
|
|
/* Convert address space */
|
|
if (tgt_dev)
|
|
gen_trans_rq(tgt_dev, rqd, TRANS_DEV_TO_TGT);
|
|
|
|
ins->tt->end_io(rqd);
|
|
}
|
|
|
|
static int gen_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
|
|
{
|
|
struct nvm_dev *dev = tgt_dev->parent;
|
|
|
|
if (!dev->ops->submit_io)
|
|
return -ENODEV;
|
|
|
|
/* Convert address space */
|
|
gen_trans_rq(tgt_dev, rqd, TRANS_TGT_TO_DEV);
|
|
nvm_generic_to_addr_mode(dev, rqd);
|
|
|
|
rqd->dev = tgt_dev;
|
|
rqd->end_io = gen_end_io;
|
|
return dev->ops->submit_io(dev, rqd);
|
|
}
|
|
|
|
static int gen_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p,
|
|
int flags)
|
|
{
|
|
/* Convert address space */
|
|
gen_map_to_dev(tgt_dev, p);
|
|
|
|
return nvm_erase_ppa(tgt_dev->parent, p, 1, flags);
|
|
}
|
|
|
|
static struct ppa_addr gen_trans_ppa(struct nvm_tgt_dev *tgt_dev,
|
|
struct ppa_addr p, int direction)
|
|
{
|
|
gen_trans_fn *f;
|
|
struct ppa_addr ppa = p;
|
|
|
|
f = (direction == TRANS_TGT_TO_DEV) ? gen_map_to_dev : gen_map_to_tgt;
|
|
f(tgt_dev, &ppa);
|
|
|
|
return ppa;
|
|
}
|
|
|
|
static void gen_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
|
|
int len)
|
|
{
|
|
struct nvm_geo *geo = &dev->geo;
|
|
struct gen_dev_map *dev_rmap = dev->rmap;
|
|
u64 i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
struct gen_ch_map *ch_rmap;
|
|
int *lun_roffs;
|
|
struct ppa_addr gaddr;
|
|
u64 pba = le64_to_cpu(entries[i]);
|
|
int off;
|
|
u64 diff;
|
|
|
|
if (!pba)
|
|
continue;
|
|
|
|
gaddr = linear_to_generic_addr(geo, pba);
|
|
ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
|
|
lun_roffs = ch_rmap->lun_offs;
|
|
|
|
off = gaddr.g.ch * geo->luns_per_chnl + gaddr.g.lun;
|
|
|
|
diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
|
|
(lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
|
|
|
|
entries[i] -= cpu_to_le64(diff);
|
|
}
|
|
}
|
|
|
|
static struct nvmm_type gen = {
|
|
.name = "gennvm",
|
|
.version = {0, 1, 0},
|
|
|
|
.register_mgr = gen_register,
|
|
.unregister_mgr = gen_unregister,
|
|
|
|
.create_tgt = gen_create_tgt,
|
|
.remove_tgt = gen_remove_tgt,
|
|
|
|
.submit_io = gen_submit_io,
|
|
.erase_blk = gen_erase_blk,
|
|
|
|
.get_area = gen_get_area,
|
|
.put_area = gen_put_area,
|
|
|
|
.trans_ppa = gen_trans_ppa,
|
|
.part_to_tgt = gen_part_to_tgt,
|
|
};
|
|
|
|
static int __init gen_module_init(void)
|
|
{
|
|
return nvm_register_mgr(&gen);
|
|
}
|
|
|
|
static void gen_module_exit(void)
|
|
{
|
|
nvm_unregister_mgr(&gen);
|
|
}
|
|
|
|
module_init(gen_module_init);
|
|
module_exit(gen_module_exit);
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("General media manager for Open-Channel SSDs");
|