gennvm: Generic NVM manager
The implementation for Open-Channel SSDs is divided into media management and targets. This patch implements a generic media manager for open-channel SSDs. After a media manager has been initialized, single or multiple targets can be instantiated with the media managed as the backend. Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling
Jens Axboe
parent
cd9e9808d1
commit
48add0f5a6
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@ -25,4 +25,11 @@ config NVM_DEBUG
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It is required to create/remove targets without IOCTLs.
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config NVM_GENNVM
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tristate "Generic NVM manager for Open-Channel SSDs"
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---help---
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NVM media manager for Open-Channel SSDs that offload management
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functionality to device, while keeping data placement and garbage
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collection decisions on the host.
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endif # NVM
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@ -3,3 +3,4 @@
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#
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obj-$(CONFIG_NVM) := core.o
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obj-$(CONFIG_NVM_GENNVM) += gennvm.o
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@ -0,0 +1,485 @@
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/*
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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 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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}
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return 0;
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}
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static int gennvm_block_bb(u32 lun_id, void *bb_bitmap, unsigned int nr_blocks,
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void *private)
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{
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struct gen_nvm *gn = private;
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struct gen_lun *lun = &gn->luns[lun_id];
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struct nvm_block *blk;
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int i;
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if (unlikely(bitmap_empty(bb_bitmap, nr_blocks)))
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return 0;
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i = -1;
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while ((i = find_next_bit(bb_bitmap, nr_blocks, i + 1)) < nr_blocks) {
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blk = &lun->vlun.blocks[i];
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if (!blk) {
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pr_err("gennvm: BB data is out of bounds.\n");
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return -EINVAL;
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}
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list_move_tail(&blk->list, &lun->bb_list);
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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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sector_t max_pages = dev->total_pages * (dev->sec_size >> 9);
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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_pages)) {
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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 >= max_pages && 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->type) {
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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
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*/
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list_move_tail(&blk->list, &lun->used_list);
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blk->type = 1;
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lun->vlun.nr_free_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;
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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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return -ENOMEM;
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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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continue;
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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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ret = dev->ops->get_bb_tbl(dev->q, lun->vlun.id,
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dev->blks_per_lun, gennvm_block_bb, gn);
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if (ret)
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pr_err("gennvm: could not read BB table\n");
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}
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}
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if (dev->ops->get_l2p_tbl) {
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ret = dev->ops->get_l2p_tbl(dev->q, 0, dev->total_pages,
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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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return 0;
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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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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->nr_luns = dev->nr_luns;
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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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kfree(gn);
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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_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 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 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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spin_lock(&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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spin_unlock(&vlun->lock);
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goto out;
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}
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while (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks) {
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spin_unlock(&vlun->lock);
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goto out;
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}
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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->type = 1;
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lun->vlun.nr_free_blocks--;
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spin_unlock(&vlun->lock);
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out:
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return blk;
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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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struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
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spin_lock(&vlun->lock);
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switch (blk->type) {
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case 1:
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list_move_tail(&blk->list, &lun->free_list);
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lun->vlun.nr_free_blocks++;
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blk->type = 0;
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break;
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case 2:
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list_move_tail(&blk->list, &lun->bb_list);
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break;
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default:
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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->type);
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list_move_tail(&blk->list, &lun->bb_list);
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}
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spin_unlock(&vlun->lock);
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}
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static void gennvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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int i;
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if (rqd->nr_pages > 1) {
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for (i = 0; i < rqd->nr_pages; i++)
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rqd->ppa_list[i] = addr_to_generic_mode(dev,
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rqd->ppa_list[i]);
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} else {
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rqd->ppa_addr = addr_to_generic_mode(dev, rqd->ppa_addr);
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}
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}
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static void gennvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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int i;
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if (rqd->nr_pages > 1) {
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for (i = 0; i < rqd->nr_pages; i++)
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rqd->ppa_list[i] = generic_to_addr_mode(dev,
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rqd->ppa_list[i]);
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} else {
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rqd->ppa_addr = generic_to_addr_mode(dev, rqd->ppa_addr);
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}
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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 0;
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/* Convert address space */
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gennvm_generic_to_addr_mode(dev, rqd);
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rqd->dev = dev;
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return dev->ops->submit_io(dev->q, rqd);
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}
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static void gennvm_blk_set_type(struct nvm_dev *dev, struct ppa_addr *ppa,
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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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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->type = type;
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}
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/* mark block bad. It is expected the target recover from the error. */
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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 i;
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if (!dev->ops->set_bb)
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return;
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if (dev->ops->set_bb(dev->q, rqd, 1))
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return;
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gennvm_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_pages > 1)
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for (i = 0; i < rqd->nr_pages; i++)
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gennvm_blk_set_type(dev, &rqd->ppa_list[i], 2);
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else
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gennvm_blk_set_type(dev, &rqd->ppa_addr, 2);
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}
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static int gennvm_end_io(struct nvm_rq *rqd, int error)
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{
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struct nvm_tgt_instance *ins = rqd->ins;
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int ret = 0;
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switch (error) {
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case NVM_RSP_SUCCESS:
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break;
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case NVM_RSP_ERR_EMPTYPAGE:
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break;
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case NVM_RSP_ERR_FAILWRITE:
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gennvm_mark_blk_bad(rqd->dev, rqd);
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default:
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ret++;
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}
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ret += ins->tt->end_io(rqd, error);
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return ret;
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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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int plane_cnt = 0, pl_idx, ret;
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struct ppa_addr addr;
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struct nvm_rq rqd;
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if (!dev->ops->erase_block)
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return 0;
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addr = block_to_ppa(dev, blk);
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if (dev->plane_mode == NVM_PLANE_SINGLE) {
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rqd.nr_pages = 1;
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rqd.ppa_addr = addr;
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} else {
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plane_cnt = (1 << dev->plane_mode);
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rqd.nr_pages = plane_cnt;
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rqd.ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL,
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&rqd.dma_ppa_list);
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if (!rqd.ppa_list) {
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pr_err("gennvm: failed to allocate dma memory\n");
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return -ENOMEM;
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}
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for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
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addr.g.pl = pl_idx;
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rqd.ppa_list[pl_idx] = addr;
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}
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}
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gennvm_generic_to_addr_mode(dev, &rqd);
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ret = dev->ops->erase_block(dev->q, &rqd);
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if (plane_cnt)
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nvm_dev_dma_free(dev, rqd.ppa_list, rqd.dma_ppa_list);
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return ret;
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}
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static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
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{
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struct gen_nvm *gn = dev->mp;
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return &gn->luns[lunid].vlun;
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}
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static void gennvm_free_blocks_print(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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unsigned int i;
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gennvm_for_each_lun(gn, lun, i)
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pr_info("%s: lun%8u\t%u\n",
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dev->name, i, lun->vlun.nr_free_blocks);
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}
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static struct nvmm_type gennvm = {
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.name = "gennvm",
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.version = {0, 1, 0},
|
||||
|
||||
.register_mgr = gennvm_register,
|
||||
.unregister_mgr = gennvm_unregister,
|
||||
|
||||
.get_blk = gennvm_get_blk,
|
||||
.put_blk = gennvm_put_blk,
|
||||
|
||||
.submit_io = gennvm_submit_io,
|
||||
.end_io = gennvm_end_io,
|
||||
.erase_blk = gennvm_erase_blk,
|
||||
|
||||
.get_lun = gennvm_get_lun,
|
||||
.free_blocks_print = gennvm_free_blocks_print,
|
||||
};
|
||||
|
||||
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");
|
||||
|
|
@ -0,0 +1,46 @@
|
|||
/*
|
||||
* Copyright: Matias Bjorling <mb@bjorling.me>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License version
|
||||
* 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef GENNVM_H_
|
||||
#define GENNVM_H_
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/vmalloc.h>
|
||||
|
||||
#include <linux/lightnvm.h>
|
||||
|
||||
struct gen_lun {
|
||||
struct nvm_lun vlun;
|
||||
|
||||
int reserved_blocks;
|
||||
/* lun block lists */
|
||||
struct list_head used_list; /* In-use blocks */
|
||||
struct list_head free_list; /* Not used blocks i.e. released
|
||||
* and ready for use
|
||||
*/
|
||||
struct list_head bb_list; /* Bad blocks. Mutually exclusive with
|
||||
* free_list and used_list
|
||||
*/
|
||||
};
|
||||
|
||||
struct gen_nvm {
|
||||
int nr_luns;
|
||||
struct gen_lun *luns;
|
||||
};
|
||||
|
||||
#define gennvm_for_each_lun(bm, lun, i) \
|
||||
for ((i) = 0, lun = &(bm)->luns[0]; \
|
||||
(i) < (bm)->nr_luns; (i)++, lun = &(bm)->luns[(i)])
|
||||
|
||||
#endif /* GENNVM_H_ */
|
||||
Loading…
Reference in New Issue