![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>
1320 lines
28 KiB
C
1320 lines
28 KiB
C
/*
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* Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
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* Initial release: 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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*/
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/sem.h>
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#include <linux/bitmap.h>
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <linux/lightnvm.h>
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#include <linux/sched/sysctl.h>
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#include <uapi/linux/lightnvm.h>
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static LIST_HEAD(nvm_tgt_types);
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static LIST_HEAD(nvm_mgrs);
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static LIST_HEAD(nvm_devices);
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static LIST_HEAD(nvm_targets);
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static DECLARE_RWSEM(nvm_lock);
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static struct nvm_target *nvm_find_target(const char *name)
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{
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struct nvm_target *tgt;
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list_for_each_entry(tgt, &nvm_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 struct nvm_tgt_type *nvm_find_target_type(const char *name)
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{
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struct nvm_tgt_type *tt;
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list_for_each_entry(tt, &nvm_tgt_types, list)
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if (!strcmp(name, tt->name))
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return tt;
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return NULL;
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}
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int nvm_register_tgt_type(struct nvm_tgt_type *tt)
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{
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int ret = 0;
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down_write(&nvm_lock);
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if (nvm_find_target_type(tt->name))
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ret = -EEXIST;
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else
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list_add(&tt->list, &nvm_tgt_types);
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up_write(&nvm_lock);
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return ret;
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}
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EXPORT_SYMBOL(nvm_register_tgt_type);
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void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
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{
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if (!tt)
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return;
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down_write(&nvm_lock);
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list_del(&tt->list);
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up_write(&nvm_lock);
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}
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EXPORT_SYMBOL(nvm_unregister_tgt_type);
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void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
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dma_addr_t *dma_handler)
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{
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return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
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dma_handler);
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}
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EXPORT_SYMBOL(nvm_dev_dma_alloc);
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void nvm_dev_dma_free(struct nvm_dev *dev, void *addr,
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dma_addr_t dma_handler)
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{
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dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
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}
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EXPORT_SYMBOL(nvm_dev_dma_free);
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static struct nvmm_type *nvm_find_mgr_type(const char *name)
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{
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struct nvmm_type *mt;
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list_for_each_entry(mt, &nvm_mgrs, list)
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if (!strcmp(name, mt->name))
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return mt;
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return NULL;
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}
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struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev)
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{
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struct nvmm_type *mt;
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int ret;
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lockdep_assert_held(&nvm_lock);
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list_for_each_entry(mt, &nvm_mgrs, list) {
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if (strncmp(dev->sb.mmtype, mt->name, NVM_MMTYPE_LEN))
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continue;
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ret = mt->register_mgr(dev);
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if (ret < 0) {
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pr_err("nvm: media mgr failed to init (%d) on dev %s\n",
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ret, dev->name);
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return NULL; /* initialization failed */
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} else if (ret > 0)
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return mt;
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}
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return NULL;
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}
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int nvm_register_mgr(struct nvmm_type *mt)
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{
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struct nvm_dev *dev;
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int ret = 0;
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down_write(&nvm_lock);
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if (nvm_find_mgr_type(mt->name)) {
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ret = -EEXIST;
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goto finish;
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} else {
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list_add(&mt->list, &nvm_mgrs);
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}
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/* try to register media mgr if any device have none configured */
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list_for_each_entry(dev, &nvm_devices, devices) {
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if (dev->mt)
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continue;
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dev->mt = nvm_init_mgr(dev);
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}
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finish:
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up_write(&nvm_lock);
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return ret;
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}
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EXPORT_SYMBOL(nvm_register_mgr);
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void nvm_unregister_mgr(struct nvmm_type *mt)
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{
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if (!mt)
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return;
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down_write(&nvm_lock);
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list_del(&mt->list);
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up_write(&nvm_lock);
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}
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EXPORT_SYMBOL(nvm_unregister_mgr);
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static struct nvm_dev *nvm_find_nvm_dev(const char *name)
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{
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struct nvm_dev *dev;
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list_for_each_entry(dev, &nvm_devices, devices)
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if (!strcmp(name, dev->name))
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return dev;
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return NULL;
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}
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struct nvm_block *nvm_get_blk_unlocked(struct nvm_dev *dev, struct nvm_lun *lun,
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unsigned long flags)
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{
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return dev->mt->get_blk_unlocked(dev, lun, flags);
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}
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EXPORT_SYMBOL(nvm_get_blk_unlocked);
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/* Assumes that all valid pages have already been moved on release to bm */
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void nvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk)
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{
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return dev->mt->put_blk_unlocked(dev, blk);
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}
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EXPORT_SYMBOL(nvm_put_blk_unlocked);
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struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun,
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unsigned long flags)
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{
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return dev->mt->get_blk(dev, lun, flags);
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}
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EXPORT_SYMBOL(nvm_get_blk);
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/* Assumes that all valid pages have already been moved on release to bm */
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void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
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{
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return dev->mt->put_blk(dev, blk);
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}
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EXPORT_SYMBOL(nvm_put_blk);
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int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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return dev->mt->submit_io(dev, rqd);
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}
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EXPORT_SYMBOL(nvm_submit_io);
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int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
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{
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return dev->mt->erase_blk(dev, blk, 0);
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}
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EXPORT_SYMBOL(nvm_erase_blk);
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void nvm_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_ppas > 1) {
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for (i = 0; i < rqd->nr_ppas; i++)
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rqd->ppa_list[i] = dev_to_generic_addr(dev,
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rqd->ppa_list[i]);
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} else {
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rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr);
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}
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}
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EXPORT_SYMBOL(nvm_addr_to_generic_mode);
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void nvm_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_ppas > 1) {
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for (i = 0; i < rqd->nr_ppas; i++)
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rqd->ppa_list[i] = generic_to_dev_addr(dev,
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rqd->ppa_list[i]);
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} else {
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rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
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}
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}
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EXPORT_SYMBOL(nvm_generic_to_addr_mode);
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int nvm_set_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd,
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struct ppa_addr *ppas, int nr_ppas, int vblk)
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{
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int i, plane_cnt, pl_idx;
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if ((!vblk || dev->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) {
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rqd->nr_ppas = nr_ppas;
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rqd->ppa_addr = ppas[0];
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return 0;
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}
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rqd->nr_ppas = nr_ppas;
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rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
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if (!rqd->ppa_list) {
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pr_err("nvm: failed to allocate dma memory\n");
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return -ENOMEM;
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}
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if (!vblk) {
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for (i = 0; i < nr_ppas; i++)
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rqd->ppa_list[i] = ppas[i];
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} else {
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plane_cnt = dev->plane_mode;
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rqd->nr_ppas *= plane_cnt;
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for (i = 0; i < nr_ppas; i++) {
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for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
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ppas[i].g.pl = pl_idx;
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rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppas[i];
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}
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(nvm_set_rqd_ppalist);
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void nvm_free_rqd_ppalist(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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if (!rqd->ppa_list)
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return;
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nvm_dev_dma_free(dev, rqd->ppa_list, rqd->dma_ppa_list);
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}
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EXPORT_SYMBOL(nvm_free_rqd_ppalist);
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int nvm_erase_ppa(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas)
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{
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struct nvm_rq rqd;
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int ret;
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if (!dev->ops->erase_block)
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return 0;
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memset(&rqd, 0, sizeof(struct nvm_rq));
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ret = nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas, 1);
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if (ret)
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return ret;
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nvm_generic_to_addr_mode(dev, &rqd);
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ret = dev->ops->erase_block(dev, &rqd);
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nvm_free_rqd_ppalist(dev, &rqd);
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return ret;
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}
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EXPORT_SYMBOL(nvm_erase_ppa);
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void nvm_end_io(struct nvm_rq *rqd, int error)
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{
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rqd->error = error;
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rqd->end_io(rqd);
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}
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EXPORT_SYMBOL(nvm_end_io);
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static void nvm_end_io_sync(struct nvm_rq *rqd)
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{
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struct completion *waiting = rqd->wait;
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rqd->wait = NULL;
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complete(waiting);
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}
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int __nvm_submit_ppa(struct nvm_dev *dev, struct nvm_rq *rqd, int opcode,
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int flags, void *buf, int len)
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{
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DECLARE_COMPLETION_ONSTACK(wait);
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struct bio *bio;
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int ret;
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unsigned long hang_check;
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bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL);
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if (IS_ERR_OR_NULL(bio))
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return -ENOMEM;
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nvm_generic_to_addr_mode(dev, rqd);
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rqd->dev = dev;
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rqd->opcode = opcode;
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rqd->flags = flags;
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rqd->bio = bio;
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rqd->wait = &wait;
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rqd->end_io = nvm_end_io_sync;
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ret = dev->ops->submit_io(dev, rqd);
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if (ret) {
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bio_put(bio);
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return ret;
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}
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/* Prevent hang_check timer from firing at us during very long I/O */
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hang_check = sysctl_hung_task_timeout_secs;
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if (hang_check)
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while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
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else
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wait_for_completion_io(&wait);
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return rqd->error;
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}
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/**
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* nvm_submit_ppa_list - submit user-defined ppa list to device. The user must
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* take to free ppa list if necessary.
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* @dev: device
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* @ppa_list: user created ppa_list
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* @nr_ppas: length of ppa_list
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* @opcode: device opcode
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* @flags: device flags
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* @buf: data buffer
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* @len: data buffer length
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*/
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int nvm_submit_ppa_list(struct nvm_dev *dev, struct ppa_addr *ppa_list,
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int nr_ppas, int opcode, int flags, void *buf, int len)
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{
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struct nvm_rq rqd;
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if (dev->ops->max_phys_sect < nr_ppas)
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return -EINVAL;
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memset(&rqd, 0, sizeof(struct nvm_rq));
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rqd.nr_ppas = nr_ppas;
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if (nr_ppas > 1)
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rqd.ppa_list = ppa_list;
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else
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rqd.ppa_addr = ppa_list[0];
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return __nvm_submit_ppa(dev, &rqd, opcode, flags, buf, len);
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}
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EXPORT_SYMBOL(nvm_submit_ppa_list);
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/**
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* nvm_submit_ppa - submit PPAs to device. PPAs will automatically be unfolded
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* as single, dual, quad plane PPAs depending on device type.
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* @dev: device
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* @ppa: user created ppa_list
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* @nr_ppas: length of ppa_list
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* @opcode: device opcode
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* @flags: device flags
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* @buf: data buffer
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* @len: data buffer length
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*/
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int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas,
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int opcode, int flags, void *buf, int len)
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{
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struct nvm_rq rqd;
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int ret;
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memset(&rqd, 0, sizeof(struct nvm_rq));
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ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas, 1);
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if (ret)
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return ret;
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ret = __nvm_submit_ppa(dev, &rqd, opcode, flags, buf, len);
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nvm_free_rqd_ppalist(dev, &rqd);
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return ret;
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}
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EXPORT_SYMBOL(nvm_submit_ppa);
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/*
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* folds a bad block list from its plane representation to its virtual
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* block representation. The fold is done in place and reduced size is
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* returned.
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*
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* If any of the planes status are bad or grown bad block, the virtual block
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* is marked bad. If not bad, the first plane state acts as the block state.
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*/
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int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
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{
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int blk, offset, pl, blktype;
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if (nr_blks != dev->blks_per_lun * dev->plane_mode)
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return -EINVAL;
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for (blk = 0; blk < dev->blks_per_lun; blk++) {
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offset = blk * dev->plane_mode;
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blktype = blks[offset];
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/* Bad blocks on any planes take precedence over other types */
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for (pl = 0; pl < dev->plane_mode; pl++) {
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if (blks[offset + pl] &
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(NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
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blktype = blks[offset + pl];
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break;
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}
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}
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blks[blk] = blktype;
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}
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return dev->blks_per_lun;
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}
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EXPORT_SYMBOL(nvm_bb_tbl_fold);
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int nvm_get_bb_tbl(struct nvm_dev *dev, struct ppa_addr ppa, u8 *blks)
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{
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ppa = generic_to_dev_addr(dev, ppa);
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return dev->ops->get_bb_tbl(dev, ppa, blks);
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}
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EXPORT_SYMBOL(nvm_get_bb_tbl);
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static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
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{
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int i;
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dev->lps_per_blk = dev->pgs_per_blk;
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dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
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if (!dev->lptbl)
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return -ENOMEM;
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/* Just a linear array */
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for (i = 0; i < dev->lps_per_blk; i++)
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dev->lptbl[i] = i;
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return 0;
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}
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static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
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{
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int i, p;
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struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
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|
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if (!mlc->num_pairs)
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return 0;
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dev->lps_per_blk = mlc->num_pairs;
|
|
dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
|
|
if (!dev->lptbl)
|
|
return -ENOMEM;
|
|
|
|
/* The lower page table encoding consists of a list of bytes, where each
|
|
* has a lower and an upper half. The first half byte maintains the
|
|
* increment value and every value after is an offset added to the
|
|
* previous incrementation value */
|
|
dev->lptbl[0] = mlc->pairs[0] & 0xF;
|
|
for (i = 1; i < dev->lps_per_blk; i++) {
|
|
p = mlc->pairs[i >> 1];
|
|
if (i & 0x1) /* upper */
|
|
dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
|
|
else /* lower */
|
|
dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nvm_core_init(struct nvm_dev *dev)
|
|
{
|
|
struct nvm_id *id = &dev->identity;
|
|
struct nvm_id_group *grp = &id->groups[0];
|
|
int ret;
|
|
|
|
/* device values */
|
|
dev->nr_chnls = grp->num_ch;
|
|
dev->luns_per_chnl = grp->num_lun;
|
|
dev->pgs_per_blk = grp->num_pg;
|
|
dev->blks_per_lun = grp->num_blk;
|
|
dev->nr_planes = grp->num_pln;
|
|
dev->fpg_size = grp->fpg_sz;
|
|
dev->pfpg_size = grp->fpg_sz * grp->num_pln;
|
|
dev->sec_size = grp->csecs;
|
|
dev->oob_size = grp->sos;
|
|
dev->sec_per_pg = grp->fpg_sz / grp->csecs;
|
|
dev->mccap = grp->mccap;
|
|
memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
|
|
|
|
dev->plane_mode = NVM_PLANE_SINGLE;
|
|
dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
|
|
|
|
if (grp->mpos & 0x020202)
|
|
dev->plane_mode = NVM_PLANE_DOUBLE;
|
|
if (grp->mpos & 0x040404)
|
|
dev->plane_mode = NVM_PLANE_QUAD;
|
|
|
|
if (grp->mtype != 0) {
|
|
pr_err("nvm: memory type not supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* calculated values */
|
|
dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
|
|
dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
|
|
dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
|
|
dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
|
|
|
|
dev->total_secs = dev->nr_luns * dev->sec_per_lun;
|
|
dev->lun_map = kcalloc(BITS_TO_LONGS(dev->nr_luns),
|
|
sizeof(unsigned long), GFP_KERNEL);
|
|
if (!dev->lun_map)
|
|
return -ENOMEM;
|
|
|
|
switch (grp->fmtype) {
|
|
case NVM_ID_FMTYPE_SLC:
|
|
if (nvm_init_slc_tbl(dev, grp)) {
|
|
ret = -ENOMEM;
|
|
goto err_fmtype;
|
|
}
|
|
break;
|
|
case NVM_ID_FMTYPE_MLC:
|
|
if (nvm_init_mlc_tbl(dev, grp)) {
|
|
ret = -ENOMEM;
|
|
goto err_fmtype;
|
|
}
|
|
break;
|
|
default:
|
|
pr_err("nvm: flash type not supported\n");
|
|
ret = -EINVAL;
|
|
goto err_fmtype;
|
|
}
|
|
|
|
mutex_init(&dev->mlock);
|
|
spin_lock_init(&dev->lock);
|
|
|
|
return 0;
|
|
err_fmtype:
|
|
kfree(dev->lun_map);
|
|
return ret;
|
|
}
|
|
|
|
static void nvm_remove_target(struct nvm_target *t)
|
|
{
|
|
struct nvm_tgt_type *tt = t->type;
|
|
struct gendisk *tdisk = t->disk;
|
|
struct request_queue *q = tdisk->queue;
|
|
|
|
lockdep_assert_held(&nvm_lock);
|
|
|
|
del_gendisk(tdisk);
|
|
blk_cleanup_queue(q);
|
|
|
|
if (tt->exit)
|
|
tt->exit(tdisk->private_data);
|
|
|
|
put_disk(tdisk);
|
|
|
|
list_del(&t->list);
|
|
kfree(t);
|
|
}
|
|
|
|
static void nvm_free_mgr(struct nvm_dev *dev)
|
|
{
|
|
struct nvm_target *tgt, *tmp;
|
|
|
|
if (!dev->mt)
|
|
return;
|
|
|
|
down_write(&nvm_lock);
|
|
list_for_each_entry_safe(tgt, tmp, &nvm_targets, list) {
|
|
if (tgt->dev != dev)
|
|
continue;
|
|
|
|
nvm_remove_target(tgt);
|
|
}
|
|
up_write(&nvm_lock);
|
|
|
|
dev->mt->unregister_mgr(dev);
|
|
dev->mt = NULL;
|
|
}
|
|
|
|
static void nvm_free(struct nvm_dev *dev)
|
|
{
|
|
if (!dev)
|
|
return;
|
|
|
|
nvm_free_mgr(dev);
|
|
|
|
kfree(dev->lptbl);
|
|
kfree(dev->lun_map);
|
|
}
|
|
|
|
static int nvm_init(struct nvm_dev *dev)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (!dev->q || !dev->ops)
|
|
return ret;
|
|
|
|
if (dev->ops->identity(dev, &dev->identity)) {
|
|
pr_err("nvm: device could not be identified\n");
|
|
goto err;
|
|
}
|
|
|
|
pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
|
|
dev->identity.ver_id, dev->identity.vmnt,
|
|
dev->identity.cgrps);
|
|
|
|
if (dev->identity.ver_id != 1) {
|
|
pr_err("nvm: device not supported by kernel.");
|
|
goto err;
|
|
}
|
|
|
|
if (dev->identity.cgrps != 1) {
|
|
pr_err("nvm: only one group configuration supported.");
|
|
goto err;
|
|
}
|
|
|
|
ret = nvm_core_init(dev);
|
|
if (ret) {
|
|
pr_err("nvm: could not initialize core structures.\n");
|
|
goto err;
|
|
}
|
|
|
|
pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
|
|
dev->name, dev->sec_per_pg, dev->nr_planes,
|
|
dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
|
|
dev->nr_chnls);
|
|
return 0;
|
|
err:
|
|
pr_err("nvm: failed to initialize nvm\n");
|
|
return ret;
|
|
}
|
|
|
|
static void nvm_exit(struct nvm_dev *dev)
|
|
{
|
|
if (dev->dma_pool)
|
|
dev->ops->destroy_dma_pool(dev->dma_pool);
|
|
nvm_free(dev);
|
|
|
|
pr_info("nvm: successfully unloaded\n");
|
|
}
|
|
|
|
int nvm_register(struct request_queue *q, char *disk_name,
|
|
struct nvm_dev_ops *ops)
|
|
{
|
|
struct nvm_dev *dev;
|
|
int ret;
|
|
|
|
if (!ops->identity)
|
|
return -EINVAL;
|
|
|
|
dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
dev->q = q;
|
|
dev->ops = ops;
|
|
strncpy(dev->name, disk_name, DISK_NAME_LEN);
|
|
|
|
ret = nvm_init(dev);
|
|
if (ret)
|
|
goto err_init;
|
|
|
|
if (dev->ops->max_phys_sect > 256) {
|
|
pr_info("nvm: max sectors supported is 256.\n");
|
|
ret = -EINVAL;
|
|
goto err_init;
|
|
}
|
|
|
|
if (dev->ops->max_phys_sect > 1) {
|
|
dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
|
|
if (!dev->dma_pool) {
|
|
pr_err("nvm: could not create dma pool\n");
|
|
ret = -ENOMEM;
|
|
goto err_init;
|
|
}
|
|
}
|
|
|
|
if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
|
|
ret = nvm_get_sysblock(dev, &dev->sb);
|
|
if (!ret)
|
|
pr_err("nvm: device not initialized.\n");
|
|
else if (ret < 0)
|
|
pr_err("nvm: err (%d) on device initialization\n", ret);
|
|
}
|
|
|
|
/* register device with a supported media manager */
|
|
down_write(&nvm_lock);
|
|
if (ret > 0)
|
|
dev->mt = nvm_init_mgr(dev);
|
|
list_add(&dev->devices, &nvm_devices);
|
|
up_write(&nvm_lock);
|
|
|
|
return 0;
|
|
err_init:
|
|
kfree(dev->lun_map);
|
|
kfree(dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(nvm_register);
|
|
|
|
void nvm_unregister(char *disk_name)
|
|
{
|
|
struct nvm_dev *dev;
|
|
|
|
down_write(&nvm_lock);
|
|
dev = nvm_find_nvm_dev(disk_name);
|
|
if (!dev) {
|
|
pr_err("nvm: could not find device %s to unregister\n",
|
|
disk_name);
|
|
up_write(&nvm_lock);
|
|
return;
|
|
}
|
|
|
|
list_del(&dev->devices);
|
|
up_write(&nvm_lock);
|
|
|
|
nvm_exit(dev);
|
|
kfree(dev);
|
|
}
|
|
EXPORT_SYMBOL(nvm_unregister);
|
|
|
|
static const struct block_device_operations nvm_fops = {
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int nvm_create_target(struct nvm_dev *dev,
|
|
struct nvm_ioctl_create *create)
|
|
{
|
|
struct nvm_ioctl_create_simple *s = &create->conf.s;
|
|
struct request_queue *tqueue;
|
|
struct gendisk *tdisk;
|
|
struct nvm_tgt_type *tt;
|
|
struct nvm_target *t;
|
|
void *targetdata;
|
|
|
|
if (!dev->mt) {
|
|
pr_info("nvm: device has no media manager registered.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
down_write(&nvm_lock);
|
|
tt = nvm_find_target_type(create->tgttype);
|
|
if (!tt) {
|
|
pr_err("nvm: target type %s not found\n", create->tgttype);
|
|
up_write(&nvm_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
t = nvm_find_target(create->tgtname);
|
|
if (t) {
|
|
pr_err("nvm: target name already exists.\n");
|
|
up_write(&nvm_lock);
|
|
return -EINVAL;
|
|
}
|
|
up_write(&nvm_lock);
|
|
|
|
t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
|
|
if (!tqueue)
|
|
goto err_t;
|
|
blk_queue_make_request(tqueue, tt->make_rq);
|
|
|
|
tdisk = alloc_disk(0);
|
|
if (!tdisk)
|
|
goto err_queue;
|
|
|
|
sprintf(tdisk->disk_name, "%s", create->tgtname);
|
|
tdisk->flags = GENHD_FL_EXT_DEVT;
|
|
tdisk->major = 0;
|
|
tdisk->first_minor = 0;
|
|
tdisk->fops = &nvm_fops;
|
|
tdisk->queue = tqueue;
|
|
|
|
targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
|
|
if (IS_ERR(targetdata))
|
|
goto err_init;
|
|
|
|
tdisk->private_data = targetdata;
|
|
tqueue->queuedata = targetdata;
|
|
|
|
blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
|
|
|
|
set_capacity(tdisk, tt->capacity(targetdata));
|
|
add_disk(tdisk);
|
|
|
|
t->type = tt;
|
|
t->disk = tdisk;
|
|
t->dev = dev;
|
|
|
|
down_write(&nvm_lock);
|
|
list_add_tail(&t->list, &nvm_targets);
|
|
up_write(&nvm_lock);
|
|
|
|
return 0;
|
|
err_init:
|
|
put_disk(tdisk);
|
|
err_queue:
|
|
blk_cleanup_queue(tqueue);
|
|
err_t:
|
|
kfree(t);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int __nvm_configure_create(struct nvm_ioctl_create *create)
|
|
{
|
|
struct nvm_dev *dev;
|
|
struct nvm_ioctl_create_simple *s;
|
|
|
|
down_write(&nvm_lock);
|
|
dev = nvm_find_nvm_dev(create->dev);
|
|
up_write(&nvm_lock);
|
|
if (!dev) {
|
|
pr_err("nvm: device not found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
|
|
pr_err("nvm: config type not valid\n");
|
|
return -EINVAL;
|
|
}
|
|
s = &create->conf.s;
|
|
|
|
if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
|
|
pr_err("nvm: lun out of bound (%u:%u > %u)\n",
|
|
s->lun_begin, s->lun_end, dev->nr_luns);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return nvm_create_target(dev, create);
|
|
}
|
|
|
|
static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
|
|
{
|
|
struct nvm_target *t;
|
|
|
|
down_write(&nvm_lock);
|
|
t = nvm_find_target(remove->tgtname);
|
|
if (!t) {
|
|
pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
|
|
up_write(&nvm_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
nvm_remove_target(t);
|
|
up_write(&nvm_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_NVM_DEBUG
|
|
static int nvm_configure_show(const char *val)
|
|
{
|
|
struct nvm_dev *dev;
|
|
char opcode, devname[DISK_NAME_LEN];
|
|
int ret;
|
|
|
|
ret = sscanf(val, "%c %32s", &opcode, devname);
|
|
if (ret != 2) {
|
|
pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
down_write(&nvm_lock);
|
|
dev = nvm_find_nvm_dev(devname);
|
|
up_write(&nvm_lock);
|
|
if (!dev) {
|
|
pr_err("nvm: device not found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!dev->mt)
|
|
return 0;
|
|
|
|
dev->mt->lun_info_print(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nvm_configure_remove(const char *val)
|
|
{
|
|
struct nvm_ioctl_remove remove;
|
|
char opcode;
|
|
int ret;
|
|
|
|
ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
|
|
if (ret != 2) {
|
|
pr_err("nvm: invalid command. Use \"d targetname\".\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
remove.flags = 0;
|
|
|
|
return __nvm_configure_remove(&remove);
|
|
}
|
|
|
|
static int nvm_configure_create(const char *val)
|
|
{
|
|
struct nvm_ioctl_create create;
|
|
char opcode;
|
|
int lun_begin, lun_end, ret;
|
|
|
|
ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
|
|
create.tgtname, create.tgttype,
|
|
&lun_begin, &lun_end);
|
|
if (ret != 6) {
|
|
pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
create.flags = 0;
|
|
create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
|
|
create.conf.s.lun_begin = lun_begin;
|
|
create.conf.s.lun_end = lun_end;
|
|
|
|
return __nvm_configure_create(&create);
|
|
}
|
|
|
|
|
|
/* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
|
|
static int nvm_configure_by_str_event(const char *val,
|
|
const struct kernel_param *kp)
|
|
{
|
|
char opcode;
|
|
int ret;
|
|
|
|
ret = sscanf(val, "%c", &opcode);
|
|
if (ret != 1) {
|
|
pr_err("nvm: string must have the format of \"cmd ...\"\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (opcode) {
|
|
case 'a':
|
|
return nvm_configure_create(val);
|
|
case 'd':
|
|
return nvm_configure_remove(val);
|
|
case 's':
|
|
return nvm_configure_show(val);
|
|
default:
|
|
pr_err("nvm: invalid command\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nvm_configure_get(char *buf, const struct kernel_param *kp)
|
|
{
|
|
int sz;
|
|
struct nvm_dev *dev;
|
|
|
|
sz = sprintf(buf, "available devices:\n");
|
|
down_write(&nvm_lock);
|
|
list_for_each_entry(dev, &nvm_devices, devices) {
|
|
if (sz > 4095 - DISK_NAME_LEN - 2)
|
|
break;
|
|
sz += sprintf(buf + sz, " %32s\n", dev->name);
|
|
}
|
|
up_write(&nvm_lock);
|
|
|
|
return sz;
|
|
}
|
|
|
|
static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
|
|
.set = nvm_configure_by_str_event,
|
|
.get = nvm_configure_get,
|
|
};
|
|
|
|
#undef MODULE_PARAM_PREFIX
|
|
#define MODULE_PARAM_PREFIX "lnvm."
|
|
|
|
module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
|
|
0644);
|
|
|
|
#endif /* CONFIG_NVM_DEBUG */
|
|
|
|
static long nvm_ioctl_info(struct file *file, void __user *arg)
|
|
{
|
|
struct nvm_ioctl_info *info;
|
|
struct nvm_tgt_type *tt;
|
|
int tgt_iter = 0;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
|
|
if (IS_ERR(info))
|
|
return -EFAULT;
|
|
|
|
info->version[0] = NVM_VERSION_MAJOR;
|
|
info->version[1] = NVM_VERSION_MINOR;
|
|
info->version[2] = NVM_VERSION_PATCH;
|
|
|
|
down_write(&nvm_lock);
|
|
list_for_each_entry(tt, &nvm_tgt_types, list) {
|
|
struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
|
|
|
|
tgt->version[0] = tt->version[0];
|
|
tgt->version[1] = tt->version[1];
|
|
tgt->version[2] = tt->version[2];
|
|
strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
|
|
|
|
tgt_iter++;
|
|
}
|
|
|
|
info->tgtsize = tgt_iter;
|
|
up_write(&nvm_lock);
|
|
|
|
if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
|
|
kfree(info);
|
|
return -EFAULT;
|
|
}
|
|
|
|
kfree(info);
|
|
return 0;
|
|
}
|
|
|
|
static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
|
|
{
|
|
struct nvm_ioctl_get_devices *devices;
|
|
struct nvm_dev *dev;
|
|
int i = 0;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
|
|
if (!devices)
|
|
return -ENOMEM;
|
|
|
|
down_write(&nvm_lock);
|
|
list_for_each_entry(dev, &nvm_devices, devices) {
|
|
struct nvm_ioctl_device_info *info = &devices->info[i];
|
|
|
|
sprintf(info->devname, "%s", dev->name);
|
|
if (dev->mt) {
|
|
info->bmversion[0] = dev->mt->version[0];
|
|
info->bmversion[1] = dev->mt->version[1];
|
|
info->bmversion[2] = dev->mt->version[2];
|
|
sprintf(info->bmname, "%s", dev->mt->name);
|
|
} else {
|
|
sprintf(info->bmname, "none");
|
|
}
|
|
|
|
i++;
|
|
if (i > 31) {
|
|
pr_err("nvm: max 31 devices can be reported.\n");
|
|
break;
|
|
}
|
|
}
|
|
up_write(&nvm_lock);
|
|
|
|
devices->nr_devices = i;
|
|
|
|
if (copy_to_user(arg, devices,
|
|
sizeof(struct nvm_ioctl_get_devices))) {
|
|
kfree(devices);
|
|
return -EFAULT;
|
|
}
|
|
|
|
kfree(devices);
|
|
return 0;
|
|
}
|
|
|
|
static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
|
|
{
|
|
struct nvm_ioctl_create create;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
|
|
return -EFAULT;
|
|
|
|
create.dev[DISK_NAME_LEN - 1] = '\0';
|
|
create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
|
|
create.tgtname[DISK_NAME_LEN - 1] = '\0';
|
|
|
|
if (create.flags != 0) {
|
|
pr_err("nvm: no flags supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return __nvm_configure_create(&create);
|
|
}
|
|
|
|
static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
|
|
{
|
|
struct nvm_ioctl_remove remove;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
|
|
return -EFAULT;
|
|
|
|
remove.tgtname[DISK_NAME_LEN - 1] = '\0';
|
|
|
|
if (remove.flags != 0) {
|
|
pr_err("nvm: no flags supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return __nvm_configure_remove(&remove);
|
|
}
|
|
|
|
static void nvm_setup_nvm_sb_info(struct nvm_sb_info *info)
|
|
{
|
|
info->seqnr = 1;
|
|
info->erase_cnt = 0;
|
|
info->version = 1;
|
|
}
|
|
|
|
static long __nvm_ioctl_dev_init(struct nvm_ioctl_dev_init *init)
|
|
{
|
|
struct nvm_dev *dev;
|
|
struct nvm_sb_info info;
|
|
int ret;
|
|
|
|
down_write(&nvm_lock);
|
|
dev = nvm_find_nvm_dev(init->dev);
|
|
up_write(&nvm_lock);
|
|
if (!dev) {
|
|
pr_err("nvm: device not found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
nvm_setup_nvm_sb_info(&info);
|
|
|
|
strncpy(info.mmtype, init->mmtype, NVM_MMTYPE_LEN);
|
|
info.fs_ppa.ppa = -1;
|
|
|
|
if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
|
|
ret = nvm_init_sysblock(dev, &info);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
memcpy(&dev->sb, &info, sizeof(struct nvm_sb_info));
|
|
|
|
down_write(&nvm_lock);
|
|
dev->mt = nvm_init_mgr(dev);
|
|
up_write(&nvm_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long nvm_ioctl_dev_init(struct file *file, void __user *arg)
|
|
{
|
|
struct nvm_ioctl_dev_init init;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init)))
|
|
return -EFAULT;
|
|
|
|
if (init.flags != 0) {
|
|
pr_err("nvm: no flags supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
init.dev[DISK_NAME_LEN - 1] = '\0';
|
|
|
|
return __nvm_ioctl_dev_init(&init);
|
|
}
|
|
|
|
static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
|
|
{
|
|
struct nvm_ioctl_dev_factory fact;
|
|
struct nvm_dev *dev;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
|
|
return -EFAULT;
|
|
|
|
fact.dev[DISK_NAME_LEN - 1] = '\0';
|
|
|
|
if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
|
|
return -EINVAL;
|
|
|
|
down_write(&nvm_lock);
|
|
dev = nvm_find_nvm_dev(fact.dev);
|
|
up_write(&nvm_lock);
|
|
if (!dev) {
|
|
pr_err("nvm: device not found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
nvm_free_mgr(dev);
|
|
|
|
if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT)
|
|
return nvm_dev_factory(dev, fact.flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case NVM_INFO:
|
|
return nvm_ioctl_info(file, argp);
|
|
case NVM_GET_DEVICES:
|
|
return nvm_ioctl_get_devices(file, argp);
|
|
case NVM_DEV_CREATE:
|
|
return nvm_ioctl_dev_create(file, argp);
|
|
case NVM_DEV_REMOVE:
|
|
return nvm_ioctl_dev_remove(file, argp);
|
|
case NVM_DEV_INIT:
|
|
return nvm_ioctl_dev_init(file, argp);
|
|
case NVM_DEV_FACTORY:
|
|
return nvm_ioctl_dev_factory(file, argp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations _ctl_fops = {
|
|
.open = nonseekable_open,
|
|
.unlocked_ioctl = nvm_ctl_ioctl,
|
|
.owner = THIS_MODULE,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct miscdevice _nvm_misc = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "lightnvm",
|
|
.nodename = "lightnvm/control",
|
|
.fops = &_ctl_fops,
|
|
};
|
|
|
|
MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
|
|
|
|
static int __init nvm_mod_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = misc_register(&_nvm_misc);
|
|
if (ret)
|
|
pr_err("nvm: misc_register failed for control device");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nvm_mod_exit(void)
|
|
{
|
|
misc_deregister(&_nvm_misc);
|
|
}
|
|
|
|
MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_VERSION("0.1");
|
|
module_init(nvm_mod_init);
|
|
module_exit(nvm_mod_exit);
|