linux/drivers/lightnvm/gennvm.c

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/*
* Copyright (C) 2015 Matias Bjorling <m@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.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
* Implementation of a general nvm manager for Open-Channel SSDs.
*/
#include "gennvm.h"
static struct nvm_target *gen_find_target(struct gen_dev *gn, const char *name)
{
struct nvm_target *tgt;
list_for_each_entry(tgt, &gn->targets, list)
if (!strcmp(name, tgt->disk->disk_name))
return tgt;
return NULL;
}
static const struct block_device_operations gen_fops = {
.owner = THIS_MODULE,
};
static int gen_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
{
struct gen_dev *gn = dev->mp;
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;
tt = nvm_find_target_type(create->tgttype, 1);
if (!tt) {
pr_err("nvm: target type %s not found\n", create->tgttype);
return -EINVAL;
}
mutex_lock(&gn->lock);
t = gen_find_target(gn, create->tgtname);
if (t) {
pr_err("nvm: target name already exists.\n");
mutex_unlock(&gn->lock);
return -EINVAL;
}
mutex_unlock(&gn->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 = &gen_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;
mutex_lock(&gn->lock);
list_add_tail(&t->list, &gn->targets);
mutex_unlock(&gn->lock);
return 0;
err_init:
put_disk(tdisk);
err_queue:
blk_cleanup_queue(tqueue);
err_t:
kfree(t);
return -ENOMEM;
}
static void __gen_remove_target(struct nvm_target *t)
{
struct nvm_tgt_type *tt = t->type;
struct gendisk *tdisk = t->disk;
struct request_queue *q = tdisk->queue;
del_gendisk(tdisk);
blk_cleanup_queue(q);
if (tt->exit)
tt->exit(tdisk->private_data);
put_disk(tdisk);
list_del(&t->list);
kfree(t);
}
/**
* gen_remove_tgt - Removes a target from the media manager
* @dev: device
* @remove: ioctl structure with target name to remove.
*
* Returns:
* 0: on success
* 1: on not found
* <0: on error
*/
static int gen_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
{
struct gen_dev *gn = dev->mp;
struct nvm_target *t;
if (!gn)
return 1;
mutex_lock(&gn->lock);
t = gen_find_target(gn, remove->tgtname);
if (!t) {
mutex_unlock(&gn->lock);
return 1;
}
__gen_remove_target(t);
mutex_unlock(&gn->lock);
return 0;
}
static int gen_get_area(struct nvm_dev *dev, sector_t *lba, sector_t len)
{
struct gen_dev *gn = dev->mp;
struct gen_area *area, *prev, *next;
sector_t begin = 0;
sector_t max_sectors = (dev->sec_size * dev->total_secs) >> 9;
if (len > max_sectors)
return -EINVAL;
area = kmalloc(sizeof(struct gen_area), GFP_KERNEL);
if (!area)
return -ENOMEM;
prev = NULL;
spin_lock(&dev->lock);
list_for_each_entry(next, &gn->area_list, list) {
if (begin + len > next->begin) {
begin = next->end;
prev = next;
continue;
}
break;
}
if ((begin + len) > max_sectors) {
spin_unlock(&dev->lock);
kfree(area);
return -EINVAL;
}
area->begin = *lba = begin;
area->end = begin + len;
if (prev) /* insert into sorted order */
list_add(&area->list, &prev->list);
else
list_add(&area->list, &gn->area_list);
spin_unlock(&dev->lock);
return 0;
}
static void gen_put_area(struct nvm_dev *dev, sector_t begin)
{
struct gen_dev *gn = dev->mp;
struct gen_area *area;
spin_lock(&dev->lock);
list_for_each_entry(area, &gn->area_list, list) {
if (area->begin != begin)
continue;
list_del(&area->list);
spin_unlock(&dev->lock);
kfree(area);
return;
}
spin_unlock(&dev->lock);
}
static void gen_blocks_free(struct nvm_dev *dev)
{
struct gen_dev *gn = dev->mp;
struct nvm_lun *lun;
int i;
gen_for_each_lun(gn, lun, i) {
if (!lun->blocks)
break;
vfree(lun->blocks);
}
}
static void gen_luns_free(struct nvm_dev *dev)
{
struct gen_dev *gn = dev->mp;
kfree(gn->luns);
}
static int gen_luns_init(struct nvm_dev *dev, struct gen_dev *gn)
{
struct nvm_lun *lun;
int i;
gn->luns = kcalloc(dev->nr_luns, sizeof(struct nvm_lun), GFP_KERNEL);
if (!gn->luns)
return -ENOMEM;
gen_for_each_lun(gn, lun, i) {
INIT_LIST_HEAD(&lun->free_list);
INIT_LIST_HEAD(&lun->used_list);
INIT_LIST_HEAD(&lun->bb_list);
spin_lock_init(&lun->lock);
lun->id = i;
lun->lun_id = i % dev->luns_per_chnl;
lun->chnl_id = i / dev->luns_per_chnl;
lun->nr_free_blocks = dev->blks_per_lun;
}
return 0;
}
static int gen_block_bb(struct gen_dev *gn, struct ppa_addr ppa,
u8 *blks, int nr_blks)
{
struct nvm_dev *dev = gn->dev;
struct nvm_lun *lun;
struct nvm_block *blk;
int i;
nr_blks = nvm_bb_tbl_fold(dev, blks, nr_blks);
if (nr_blks < 0)
return nr_blks;
lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
for (i = 0; i < nr_blks; i++) {
if (blks[i] == NVM_BLK_T_FREE)
continue;
blk = &lun->blocks[i];
list_move_tail(&blk->list, &lun->bb_list);
blk->state = NVM_BLK_ST_BAD;
lun->nr_free_blocks--;
}
return 0;
}
static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
{
struct nvm_dev *dev = private;
struct gen_dev *gn = dev->mp;
u64 elba = slba + nlb;
struct nvm_lun *lun;
struct nvm_block *blk;
u64 i;
int lun_id;
if (unlikely(elba > dev->total_secs)) {
pr_err("gen: L2P data from device is out of bounds!\n");
return -EINVAL;
}
for (i = 0; i < nlb; i++) {
u64 pba = le64_to_cpu(entries[i]);
if (unlikely(pba >= dev->total_secs && pba != U64_MAX)) {
pr_err("gen: L2P data entry is out of bounds!\n");
return -EINVAL;
}
/* Address zero is a special one. The first page on a disk is
* protected. It often holds internal device boot
* information.
*/
if (!pba)
continue;
/* resolve block from physical address */
lun_id = div_u64(pba, dev->sec_per_lun);
lun = &gn->luns[lun_id];
/* Calculate block offset into lun */
pba = pba - (dev->sec_per_lun * lun_id);
blk = &lun->blocks[div_u64(pba, dev->sec_per_blk)];
if (!blk->state) {
/* at this point, we don't know anything about the
* block. It's up to the FTL on top to re-etablish the
* block state. The block is assumed to be open.
*/
list_move_tail(&blk->list, &lun->used_list);
blk->state = NVM_BLK_ST_TGT;
lun->nr_free_blocks--;
}
}
return 0;
}
static int gen_blocks_init(struct nvm_dev *dev, struct gen_dev *gn)
{
struct nvm_lun *lun;
struct nvm_block *block;
sector_t lun_iter, blk_iter, cur_block_id = 0;
int ret, nr_blks;
u8 *blks;
nr_blks = dev->blks_per_lun * dev->plane_mode;
blks = kmalloc(nr_blks, GFP_KERNEL);
if (!blks)
return -ENOMEM;
gen_for_each_lun(gn, lun, lun_iter) {
lun->blocks = vzalloc(sizeof(struct nvm_block) *
dev->blks_per_lun);
if (!lun->blocks) {
kfree(blks);
return -ENOMEM;
}
for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) {
block = &lun->blocks[blk_iter];
INIT_LIST_HEAD(&block->list);
block->lun = lun;
block->id = cur_block_id++;
list_add_tail(&block->list, &lun->free_list);
}
if (dev->ops->get_bb_tbl) {
struct ppa_addr ppa;
ppa.ppa = 0;
ppa.g.ch = lun->chnl_id;
ppa.g.lun = lun->lun_id;
ret = nvm_get_bb_tbl(dev, ppa, blks);
if (ret)
pr_err("gen: could not get BB table\n");
ret = gen_block_bb(gn, ppa, blks, nr_blks);
if (ret)
pr_err("gen: BB table map failed\n");
}
}
if ((dev->identity.dom & NVM_RSP_L2P) && dev->ops->get_l2p_tbl) {
ret = dev->ops->get_l2p_tbl(dev, 0, dev->total_secs,
gen_block_map, dev);
if (ret) {
pr_err("gen: could not read L2P table.\n");
pr_warn("gen: default block initialization");
}
}
kfree(blks);
return 0;
}
static void gen_free(struct nvm_dev *dev)
{
gen_blocks_free(dev);
gen_luns_free(dev);
kfree(dev->mp);
dev->mp = NULL;
}
static int gen_register(struct nvm_dev *dev)
{
struct gen_dev *gn;
int ret;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
gn = kzalloc(sizeof(struct gen_dev), GFP_KERNEL);
if (!gn)
return -ENOMEM;
gn->dev = dev;
gn->nr_luns = dev->nr_luns;
INIT_LIST_HEAD(&gn->area_list);
mutex_init(&gn->lock);
INIT_LIST_HEAD(&gn->targets);
dev->mp = gn;
ret = gen_luns_init(dev, gn);
if (ret) {
pr_err("gen: could not initialize luns\n");
goto err;
}
ret = gen_blocks_init(dev, gn);
if (ret) {
pr_err("gen: could not initialize blocks\n");
goto err;
}
return 1;
err:
gen_free(dev);
module_put(THIS_MODULE);
return ret;
}
static void gen_unregister(struct nvm_dev *dev)
{
struct gen_dev *gn = dev->mp;
struct nvm_target *t, *tmp;
mutex_lock(&gn->lock);
list_for_each_entry_safe(t, tmp, &gn->targets, list) {
if (t->dev != dev)
continue;
__gen_remove_target(t);
}
mutex_unlock(&gn->lock);
gen_free(dev);
module_put(THIS_MODULE);
}
static struct nvm_block *gen_get_blk(struct nvm_dev *dev,
struct nvm_lun *lun, unsigned long flags)
{
struct nvm_block *blk = NULL;
int is_gc = flags & NVM_IOTYPE_GC;
spin_lock(&lun->lock);
if (list_empty(&lun->free_list)) {
pr_err_ratelimited("gen: lun %u have no free pages available",
lun->id);
goto out;
}
if (!is_gc && lun->nr_free_blocks < lun->reserved_blocks)
goto out;
blk = list_first_entry(&lun->free_list, struct nvm_block, list);
list_move_tail(&blk->list, &lun->used_list);
blk->state = NVM_BLK_ST_TGT;
lun->nr_free_blocks--;
out:
spin_unlock(&lun->lock);
return blk;
}
static void gen_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
{
struct nvm_lun *lun = blk->lun;
spin_lock(&lun->lock);
if (blk->state & NVM_BLK_ST_TGT) {
list_move_tail(&blk->list, &lun->free_list);
lun->nr_free_blocks++;
blk->state = NVM_BLK_ST_FREE;
} else if (blk->state & NVM_BLK_ST_BAD) {
list_move_tail(&blk->list, &lun->bb_list);
blk->state = NVM_BLK_ST_BAD;
} else {
WARN_ON_ONCE(1);
pr_err("gen: erroneous block type (%lu -> %u)\n",
blk->id, blk->state);
list_move_tail(&blk->list, &lun->bb_list);
}
spin_unlock(&lun->lock);
}
static void gen_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
{
struct gen_dev *gn = dev->mp;
struct nvm_lun *lun;
struct nvm_block *blk;
pr_debug("gen: ppa (ch: %u lun: %u blk: %u pg: %u) -> %u\n",
ppa.g.ch, ppa.g.lun, ppa.g.blk, ppa.g.pg, type);
if (unlikely(ppa.g.ch > dev->nr_chnls ||
ppa.g.lun > dev->luns_per_chnl ||
ppa.g.blk > dev->blks_per_lun)) {
WARN_ON_ONCE(1);
pr_err("gen: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u",
ppa.g.ch, dev->nr_chnls,
ppa.g.lun, dev->luns_per_chnl,
ppa.g.blk, dev->blks_per_lun);
return;
}
lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
blk = &lun->blocks[ppa.g.blk];
/* will be moved to bb list on put_blk from target */
blk->state = type;
}
static void gen_end_io(struct nvm_rq *rqd)
{
struct nvm_tgt_instance *ins = rqd->ins;
ins->tt->end_io(rqd);
}
static int gen_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
{
if (!dev->ops->submit_io)
return -ENODEV;
/* Convert address space */
nvm_generic_to_addr_mode(dev, rqd);
rqd->dev = dev;
rqd->end_io = gen_end_io;
return dev->ops->submit_io(dev, rqd);
}
static int gen_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, int flags)
{
struct ppa_addr addr = block_to_ppa(dev, blk);
return nvm_erase_ppa(dev, &addr, 1, flags);
}
static int gen_reserve_lun(struct nvm_dev *dev, int lunid)
{
return test_and_set_bit(lunid, dev->lun_map);
}
static void gen_release_lun(struct nvm_dev *dev, int lunid)
{
WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
}
static struct nvm_lun *gen_get_lun(struct nvm_dev *dev, int lunid)
{
struct gen_dev *gn = dev->mp;
if (unlikely(lunid >= dev->nr_luns))
return NULL;
return &gn->luns[lunid];
}
static void gen_lun_info_print(struct nvm_dev *dev)
{
struct gen_dev *gn = dev->mp;
struct nvm_lun *lun;
unsigned int i;
gen_for_each_lun(gn, lun, i) {
spin_lock(&lun->lock);
pr_info("%s: lun%8u\t%u\n", dev->name, i,
lun->nr_free_blocks);
spin_unlock(&lun->lock);
}
}
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,
.get_blk = gen_get_blk,
.put_blk = gen_put_blk,
.submit_io = gen_submit_io,
.erase_blk = gen_erase_blk,
.mark_blk = gen_mark_blk,
.get_lun = gen_get_lun,
.reserve_lun = gen_reserve_lun,
.release_lun = gen_release_lun,
.lun_info_print = gen_lun_info_print,
.get_area = gen_get_area,
.put_area = gen_put_area,
};
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");