kernel-ark/drivers/lightnvm/core.c
Javier González e53927393b lightnvm: set target over-provision on create ioctl
Allow to set the over-provision percentage on target creation. In case
that the value is not provided, fall back to the default value set by
the target.

In pblk, set the default OP to 11% of the total size of the device

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-01-05 08:50:12 -07:00

1260 lines
27 KiB
C

/*
* Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
* Initial release: 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.
*
*/
#include <linux/list.h>
#include <linux/types.h>
#include <linux/sem.h>
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/lightnvm.h>
#include <linux/sched/sysctl.h>
static LIST_HEAD(nvm_tgt_types);
static DECLARE_RWSEM(nvm_tgtt_lock);
static LIST_HEAD(nvm_devices);
static DECLARE_RWSEM(nvm_lock);
/* Map between virtual and physical channel and lun */
struct nvm_ch_map {
int ch_off;
int nr_luns;
int *lun_offs;
};
struct nvm_dev_map {
struct nvm_ch_map *chnls;
int nr_chnls;
};
static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name)
{
struct nvm_target *tgt;
list_for_each_entry(tgt, &dev->targets, list)
if (!strcmp(name, tgt->disk->disk_name))
return tgt;
return NULL;
}
static bool nvm_target_exists(const char *name)
{
struct nvm_dev *dev;
struct nvm_target *tgt;
bool ret = false;
down_write(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices) {
mutex_lock(&dev->mlock);
list_for_each_entry(tgt, &dev->targets, list) {
if (!strcmp(name, tgt->disk->disk_name)) {
ret = true;
mutex_unlock(&dev->mlock);
goto out;
}
}
mutex_unlock(&dev->mlock);
}
out:
up_write(&nvm_lock);
return ret;
}
static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end)
{
int i;
for (i = lun_begin; i <= lun_end; i++) {
if (test_and_set_bit(i, dev->lun_map)) {
pr_err("nvm: lun %d already allocated\n", i);
goto err;
}
}
return 0;
err:
while (--i >= lun_begin)
clear_bit(i, dev->lun_map);
return -EBUSY;
}
static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin,
int lun_end)
{
int i;
for (i = lun_begin; i <= lun_end; i++)
WARN_ON(!test_and_clear_bit(i, dev->lun_map));
}
static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear)
{
struct nvm_dev *dev = tgt_dev->parent;
struct nvm_dev_map *dev_map = tgt_dev->map;
int i, j;
for (i = 0; i < dev_map->nr_chnls; i++) {
struct nvm_ch_map *ch_map = &dev_map->chnls[i];
int *lun_offs = ch_map->lun_offs;
int ch = i + ch_map->ch_off;
if (clear) {
for (j = 0; j < ch_map->nr_luns; j++) {
int lun = j + lun_offs[j];
int lunid = (ch * dev->geo.nr_luns) + lun;
WARN_ON(!test_and_clear_bit(lunid,
dev->lun_map));
}
}
kfree(ch_map->lun_offs);
}
kfree(dev_map->chnls);
kfree(dev_map);
kfree(tgt_dev->luns);
kfree(tgt_dev);
}
static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev,
u16 lun_begin, u16 lun_end,
u16 op)
{
struct nvm_tgt_dev *tgt_dev = NULL;
struct nvm_dev_map *dev_rmap = dev->rmap;
struct nvm_dev_map *dev_map;
struct ppa_addr *luns;
int nr_luns = lun_end - lun_begin + 1;
int luns_left = nr_luns;
int nr_chnls = nr_luns / dev->geo.nr_luns;
int nr_chnls_mod = nr_luns % dev->geo.nr_luns;
int bch = lun_begin / dev->geo.nr_luns;
int blun = lun_begin % dev->geo.nr_luns;
int lunid = 0;
int lun_balanced = 1;
int prev_nr_luns;
int i, j;
nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1;
dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
if (!dev_map)
goto err_dev;
dev_map->chnls = kcalloc(nr_chnls, sizeof(struct nvm_ch_map),
GFP_KERNEL);
if (!dev_map->chnls)
goto err_chnls;
luns = kcalloc(nr_luns, sizeof(struct ppa_addr), GFP_KERNEL);
if (!luns)
goto err_luns;
prev_nr_luns = (luns_left > dev->geo.nr_luns) ?
dev->geo.nr_luns : luns_left;
for (i = 0; i < nr_chnls; i++) {
struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch];
int *lun_roffs = ch_rmap->lun_offs;
struct nvm_ch_map *ch_map = &dev_map->chnls[i];
int *lun_offs;
int luns_in_chnl = (luns_left > dev->geo.nr_luns) ?
dev->geo.nr_luns : luns_left;
if (lun_balanced && prev_nr_luns != luns_in_chnl)
lun_balanced = 0;
ch_map->ch_off = ch_rmap->ch_off = bch;
ch_map->nr_luns = luns_in_chnl;
lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
if (!lun_offs)
goto err_ch;
for (j = 0; j < luns_in_chnl; j++) {
luns[lunid].ppa = 0;
luns[lunid].g.ch = i;
luns[lunid++].g.lun = j;
lun_offs[j] = blun;
lun_roffs[j + blun] = blun;
}
ch_map->lun_offs = lun_offs;
/* when starting a new channel, lun offset is reset */
blun = 0;
luns_left -= luns_in_chnl;
}
dev_map->nr_chnls = nr_chnls;
tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
if (!tgt_dev)
goto err_ch;
memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
/* Target device only owns a portion of the physical device */
tgt_dev->geo.nr_chnls = nr_chnls;
tgt_dev->geo.all_luns = nr_luns;
tgt_dev->geo.nr_luns = (lun_balanced) ? prev_nr_luns : -1;
tgt_dev->geo.op = op;
tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun;
tgt_dev->q = dev->q;
tgt_dev->map = dev_map;
tgt_dev->luns = luns;
memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id));
tgt_dev->parent = dev;
return tgt_dev;
err_ch:
while (--i >= 0)
kfree(dev_map->chnls[i].lun_offs);
kfree(luns);
err_luns:
kfree(dev_map->chnls);
err_chnls:
kfree(dev_map);
err_dev:
return tgt_dev;
}
static const struct block_device_operations nvm_fops = {
.owner = THIS_MODULE,
};
static struct nvm_tgt_type *__nvm_find_target_type(const char *name)
{
struct nvm_tgt_type *tt;
list_for_each_entry(tt, &nvm_tgt_types, list)
if (!strcmp(name, tt->name))
return tt;
return NULL;
}
static struct nvm_tgt_type *nvm_find_target_type(const char *name)
{
struct nvm_tgt_type *tt;
down_write(&nvm_tgtt_lock);
tt = __nvm_find_target_type(name);
up_write(&nvm_tgtt_lock);
return tt;
}
static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin,
int lun_end)
{
if (lun_begin > lun_end || lun_end >= geo->all_luns) {
pr_err("nvm: lun out of bound (%u:%u > %u)\n",
lun_begin, lun_end, geo->all_luns - 1);
return -EINVAL;
}
return 0;
}
static int __nvm_config_simple(struct nvm_dev *dev,
struct nvm_ioctl_create_simple *s)
{
struct nvm_geo *geo = &dev->geo;
if (s->lun_begin == -1 && s->lun_end == -1) {
s->lun_begin = 0;
s->lun_end = geo->all_luns - 1;
}
return nvm_config_check_luns(geo, s->lun_begin, s->lun_end);
}
static int __nvm_config_extended(struct nvm_dev *dev,
struct nvm_ioctl_create_extended *e)
{
struct nvm_geo *geo = &dev->geo;
if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) {
e->lun_begin = 0;
e->lun_end = dev->geo.all_luns - 1;
}
/* op not set falls into target's default */
if (e->op == 0xFFFF)
e->op = NVM_TARGET_DEFAULT_OP;
if (e->op < NVM_TARGET_MIN_OP ||
e->op > NVM_TARGET_MAX_OP) {
pr_err("nvm: invalid over provisioning value\n");
return -EINVAL;
}
return nvm_config_check_luns(geo, e->lun_begin, e->lun_end);
}
static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
{
struct nvm_ioctl_create_extended e;
struct request_queue *tqueue;
struct gendisk *tdisk;
struct nvm_tgt_type *tt;
struct nvm_target *t;
struct nvm_tgt_dev *tgt_dev;
void *targetdata;
int ret;
switch (create->conf.type) {
case NVM_CONFIG_TYPE_SIMPLE:
ret = __nvm_config_simple(dev, &create->conf.s);
if (ret)
return ret;
e.lun_begin = create->conf.s.lun_begin;
e.lun_end = create->conf.s.lun_end;
e.op = NVM_TARGET_DEFAULT_OP;
break;
case NVM_CONFIG_TYPE_EXTENDED:
ret = __nvm_config_extended(dev, &create->conf.e);
if (ret)
return ret;
e = create->conf.e;
break;
default:
pr_err("nvm: config type not valid\n");
return -EINVAL;
}
tt = nvm_find_target_type(create->tgttype);
if (!tt) {
pr_err("nvm: target type %s not found\n", create->tgttype);
return -EINVAL;
}
if (nvm_target_exists(create->tgtname)) {
pr_err("nvm: target name already exists (%s)\n",
create->tgtname);
return -EINVAL;
}
ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end);
if (ret)
return ret;
t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
if (!t) {
ret = -ENOMEM;
goto err_reserve;
}
tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op);
if (!tgt_dev) {
pr_err("nvm: could not create target device\n");
ret = -ENOMEM;
goto err_t;
}
tdisk = alloc_disk(0);
if (!tdisk) {
ret = -ENOMEM;
goto err_dev;
}
tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
if (!tqueue) {
ret = -ENOMEM;
goto err_disk;
}
blk_queue_make_request(tqueue, tt->make_rq);
strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
tdisk->flags = GENHD_FL_EXT_DEVT;
tdisk->major = 0;
tdisk->first_minor = 0;
tdisk->fops = &nvm_fops;
tdisk->queue = tqueue;
targetdata = tt->init(tgt_dev, tdisk, create->flags);
if (IS_ERR(targetdata)) {
ret = PTR_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);
if (tt->sysfs_init && tt->sysfs_init(tdisk)) {
ret = -ENOMEM;
goto err_sysfs;
}
t->type = tt;
t->disk = tdisk;
t->dev = tgt_dev;
mutex_lock(&dev->mlock);
list_add_tail(&t->list, &dev->targets);
mutex_unlock(&dev->mlock);
__module_get(tt->owner);
return 0;
err_sysfs:
if (tt->exit)
tt->exit(targetdata);
err_init:
blk_cleanup_queue(tqueue);
tdisk->queue = NULL;
err_disk:
put_disk(tdisk);
err_dev:
nvm_remove_tgt_dev(tgt_dev, 0);
err_t:
kfree(t);
err_reserve:
nvm_release_luns_err(dev, e.lun_begin, e.lun_end);
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;
del_gendisk(tdisk);
blk_cleanup_queue(q);
if (tt->sysfs_exit)
tt->sysfs_exit(tdisk);
if (tt->exit)
tt->exit(tdisk->private_data);
nvm_remove_tgt_dev(t->dev, 1);
put_disk(tdisk);
module_put(t->type->owner);
list_del(&t->list);
kfree(t);
}
/**
* nvm_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 nvm_remove_tgt(struct nvm_dev *dev, struct nvm_ioctl_remove *remove)
{
struct nvm_target *t;
mutex_lock(&dev->mlock);
t = nvm_find_target(dev, remove->tgtname);
if (!t) {
mutex_unlock(&dev->mlock);
return 1;
}
__nvm_remove_target(t);
mutex_unlock(&dev->mlock);
return 0;
}
static int nvm_register_map(struct nvm_dev *dev)
{
struct nvm_dev_map *rmap;
int i, j;
rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
if (!rmap)
goto err_rmap;
rmap->chnls = kcalloc(dev->geo.nr_chnls, sizeof(struct nvm_ch_map),
GFP_KERNEL);
if (!rmap->chnls)
goto err_chnls;
for (i = 0; i < dev->geo.nr_chnls; i++) {
struct nvm_ch_map *ch_rmap;
int *lun_roffs;
int luns_in_chnl = dev->geo.nr_luns;
ch_rmap = &rmap->chnls[i];
ch_rmap->ch_off = -1;
ch_rmap->nr_luns = luns_in_chnl;
lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL);
if (!lun_roffs)
goto err_ch;
for (j = 0; j < luns_in_chnl; j++)
lun_roffs[j] = -1;
ch_rmap->lun_offs = lun_roffs;
}
dev->rmap = rmap;
return 0;
err_ch:
while (--i >= 0)
kfree(rmap->chnls[i].lun_offs);
err_chnls:
kfree(rmap);
err_rmap:
return -ENOMEM;
}
static void nvm_unregister_map(struct nvm_dev *dev)
{
struct nvm_dev_map *rmap = dev->rmap;
int i;
for (i = 0; i < dev->geo.nr_chnls; i++)
kfree(rmap->chnls[i].lun_offs);
kfree(rmap->chnls);
kfree(rmap);
}
static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
{
struct nvm_dev_map *dev_map = tgt_dev->map;
struct nvm_ch_map *ch_map = &dev_map->chnls[p->g.ch];
int lun_off = ch_map->lun_offs[p->g.lun];
p->g.ch += ch_map->ch_off;
p->g.lun += lun_off;
}
static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
{
struct nvm_dev *dev = tgt_dev->parent;
struct nvm_dev_map *dev_rmap = dev->rmap;
struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->g.ch];
int lun_roff = ch_rmap->lun_offs[p->g.lun];
p->g.ch -= ch_rmap->ch_off;
p->g.lun -= lun_roff;
}
static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev,
struct ppa_addr *ppa_list, int nr_ppas)
{
int i;
for (i = 0; i < nr_ppas; i++) {
nvm_map_to_dev(tgt_dev, &ppa_list[i]);
ppa_list[i] = generic_to_dev_addr(tgt_dev, ppa_list[i]);
}
}
static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev,
struct ppa_addr *ppa_list, int nr_ppas)
{
int i;
for (i = 0; i < nr_ppas; i++) {
ppa_list[i] = dev_to_generic_addr(tgt_dev, ppa_list[i]);
nvm_map_to_tgt(tgt_dev, &ppa_list[i]);
}
}
static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
if (rqd->nr_ppas == 1) {
nvm_ppa_tgt_to_dev(tgt_dev, &rqd->ppa_addr, 1);
return;
}
nvm_ppa_tgt_to_dev(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
}
static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
if (rqd->nr_ppas == 1) {
nvm_ppa_dev_to_tgt(tgt_dev, &rqd->ppa_addr, 1);
return;
}
nvm_ppa_dev_to_tgt(tgt_dev, rqd->ppa_list, rqd->nr_ppas);
}
int nvm_register_tgt_type(struct nvm_tgt_type *tt)
{
int ret = 0;
down_write(&nvm_tgtt_lock);
if (__nvm_find_target_type(tt->name))
ret = -EEXIST;
else
list_add(&tt->list, &nvm_tgt_types);
up_write(&nvm_tgtt_lock);
return ret;
}
EXPORT_SYMBOL(nvm_register_tgt_type);
void nvm_unregister_tgt_type(struct nvm_tgt_type *tt)
{
if (!tt)
return;
down_write(&nvm_tgtt_lock);
list_del(&tt->list);
up_write(&nvm_tgtt_lock);
}
EXPORT_SYMBOL(nvm_unregister_tgt_type);
void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
dma_addr_t *dma_handler)
{
return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags,
dma_handler);
}
EXPORT_SYMBOL(nvm_dev_dma_alloc);
void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler)
{
dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler);
}
EXPORT_SYMBOL(nvm_dev_dma_free);
static struct nvm_dev *nvm_find_nvm_dev(const char *name)
{
struct nvm_dev *dev;
list_for_each_entry(dev, &nvm_devices, devices)
if (!strcmp(name, dev->name))
return dev;
return NULL;
}
static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
const struct ppa_addr *ppas, int nr_ppas)
{
struct nvm_dev *dev = tgt_dev->parent;
struct nvm_geo *geo = &tgt_dev->geo;
int i, plane_cnt, pl_idx;
struct ppa_addr ppa;
if (geo->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) {
rqd->nr_ppas = nr_ppas;
rqd->ppa_addr = ppas[0];
return 0;
}
rqd->nr_ppas = nr_ppas;
rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list);
if (!rqd->ppa_list) {
pr_err("nvm: failed to allocate dma memory\n");
return -ENOMEM;
}
plane_cnt = geo->plane_mode;
rqd->nr_ppas *= plane_cnt;
for (i = 0; i < nr_ppas; i++) {
for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
ppa = ppas[i];
ppa.g.pl = pl_idx;
rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa;
}
}
return 0;
}
static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
struct nvm_rq *rqd)
{
if (!rqd->ppa_list)
return;
nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
}
int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
int nr_ppas, int type)
{
struct nvm_dev *dev = tgt_dev->parent;
struct nvm_rq rqd;
int ret;
if (nr_ppas > dev->ops->max_phys_sect) {
pr_err("nvm: unable to update all blocks atomically\n");
return -EINVAL;
}
memset(&rqd, 0, sizeof(struct nvm_rq));
nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas);
nvm_rq_tgt_to_dev(tgt_dev, &rqd);
ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
nvm_free_rqd_ppalist(tgt_dev, &rqd);
if (ret) {
pr_err("nvm: failed bb mark\n");
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
{
struct nvm_dev *dev = tgt_dev->parent;
return dev->ops->max_phys_sect;
}
EXPORT_SYMBOL(nvm_max_phys_sects);
int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
struct nvm_dev *dev = tgt_dev->parent;
int ret;
if (!dev->ops->submit_io)
return -ENODEV;
nvm_rq_tgt_to_dev(tgt_dev, rqd);
rqd->dev = tgt_dev;
/* In case of error, fail with right address format */
ret = dev->ops->submit_io(dev, rqd);
if (ret)
nvm_rq_dev_to_tgt(tgt_dev, rqd);
return ret;
}
EXPORT_SYMBOL(nvm_submit_io);
int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
struct nvm_dev *dev = tgt_dev->parent;
int ret;
if (!dev->ops->submit_io_sync)
return -ENODEV;
nvm_rq_tgt_to_dev(tgt_dev, rqd);
rqd->dev = tgt_dev;
/* In case of error, fail with right address format */
ret = dev->ops->submit_io_sync(dev, rqd);
nvm_rq_dev_to_tgt(tgt_dev, rqd);
return ret;
}
EXPORT_SYMBOL(nvm_submit_io_sync);
void nvm_end_io(struct nvm_rq *rqd)
{
struct nvm_tgt_dev *tgt_dev = rqd->dev;
/* Convert address space */
if (tgt_dev)
nvm_rq_dev_to_tgt(tgt_dev, rqd);
if (rqd->end_io)
rqd->end_io(rqd);
}
EXPORT_SYMBOL(nvm_end_io);
/*
* folds a bad block list from its plane representation to its virtual
* block representation. The fold is done in place and reduced size is
* returned.
*
* If any of the planes status are bad or grown bad block, the virtual block
* is marked bad. If not bad, the first plane state acts as the block state.
*/
int nvm_bb_tbl_fold(struct nvm_dev *dev, u8 *blks, int nr_blks)
{
struct nvm_geo *geo = &dev->geo;
int blk, offset, pl, blktype;
if (nr_blks != geo->nr_chks * geo->plane_mode)
return -EINVAL;
for (blk = 0; blk < geo->nr_chks; blk++) {
offset = blk * geo->plane_mode;
blktype = blks[offset];
/* Bad blocks on any planes take precedence over other types */
for (pl = 0; pl < geo->plane_mode; pl++) {
if (blks[offset + pl] &
(NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
blktype = blks[offset + pl];
break;
}
}
blks[blk] = blktype;
}
return geo->nr_chks;
}
EXPORT_SYMBOL(nvm_bb_tbl_fold);
int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
u8 *blks)
{
struct nvm_dev *dev = tgt_dev->parent;
nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
return dev->ops->get_bb_tbl(dev, ppa, blks);
}
EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
static int nvm_core_init(struct nvm_dev *dev)
{
struct nvm_id *id = &dev->identity;
struct nvm_id_group *grp = &id->grp;
struct nvm_geo *geo = &dev->geo;
int ret;
memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
if (grp->mtype != 0) {
pr_err("nvm: memory type not supported\n");
return -EINVAL;
}
/* Whole device values */
geo->nr_chnls = grp->num_ch;
geo->nr_luns = grp->num_lun;
/* Generic device geometry values */
geo->ws_min = grp->ws_min;
geo->ws_opt = grp->ws_opt;
geo->ws_seq = grp->ws_seq;
geo->ws_per_chk = grp->ws_per_chk;
geo->nr_chks = grp->num_chk;
geo->sec_size = grp->csecs;
geo->oob_size = grp->sos;
geo->mccap = grp->mccap;
geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
geo->sec_per_chk = grp->clba;
geo->sec_per_lun = geo->sec_per_chk * geo->nr_chks;
geo->all_luns = geo->nr_luns * geo->nr_chnls;
/* 1.2 spec device geometry values */
geo->plane_mode = 1 << geo->ws_seq;
geo->nr_planes = geo->ws_opt / geo->ws_min;
geo->sec_per_pg = geo->ws_min;
geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
dev->total_secs = geo->all_luns * geo->sec_per_lun;
dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns),
sizeof(unsigned long), GFP_KERNEL);
if (!dev->lun_map)
return -ENOMEM;
INIT_LIST_HEAD(&dev->area_list);
INIT_LIST_HEAD(&dev->targets);
mutex_init(&dev->mlock);
spin_lock_init(&dev->lock);
ret = nvm_register_map(dev);
if (ret)
goto err_fmtype;
blk_queue_logical_block_size(dev->q, geo->sec_size);
return 0;
err_fmtype:
kfree(dev->lun_map);
return ret;
}
static void nvm_free(struct nvm_dev *dev)
{
if (!dev)
return;
if (dev->dma_pool)
dev->ops->destroy_dma_pool(dev->dma_pool);
nvm_unregister_map(dev);
kfree(dev->lun_map);
kfree(dev);
}
static int nvm_init(struct nvm_dev *dev)
{
struct nvm_geo *geo = &dev->geo;
int ret = -EINVAL;
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\n",
dev->identity.ver_id, dev->identity.vmnt);
if (dev->identity.ver_id != 1) {
pr_err("nvm: device not supported by kernel.");
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, geo->sec_per_pg, geo->nr_planes,
geo->ws_per_chk, geo->nr_chks,
geo->all_luns, geo->nr_chnls);
return 0;
err:
pr_err("nvm: failed to initialize nvm\n");
return ret;
}
struct nvm_dev *nvm_alloc_dev(int node)
{
return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
}
EXPORT_SYMBOL(nvm_alloc_dev);
int nvm_register(struct nvm_dev *dev)
{
int ret;
if (!dev->q || !dev->ops)
return -EINVAL;
if (dev->ops->max_phys_sect > 256) {
pr_info("nvm: max sectors supported is 256.\n");
return -EINVAL;
}
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");
return -ENOMEM;
}
}
ret = nvm_init(dev);
if (ret)
goto err_init;
/* register device with a supported media manager */
down_write(&nvm_lock);
list_add(&dev->devices, &nvm_devices);
up_write(&nvm_lock);
return 0;
err_init:
dev->ops->destroy_dma_pool(dev->dma_pool);
return ret;
}
EXPORT_SYMBOL(nvm_register);
void nvm_unregister(struct nvm_dev *dev)
{
struct nvm_target *t, *tmp;
mutex_lock(&dev->mlock);
list_for_each_entry_safe(t, tmp, &dev->targets, list) {
if (t->dev->parent != dev)
continue;
__nvm_remove_target(t);
}
mutex_unlock(&dev->mlock);
down_write(&nvm_lock);
list_del(&dev->devices);
up_write(&nvm_lock);
nvm_free(dev);
}
EXPORT_SYMBOL(nvm_unregister);
static int __nvm_configure_create(struct nvm_ioctl_create *create)
{
struct nvm_dev *dev;
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;
}
return nvm_create_tgt(dev, create);
}
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_tgtt_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_tgtt_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];
strlcpy(info->devname, dev->name, sizeof(info->devname));
/* kept for compatibility */
info->bmversion[0] = 1;
info->bmversion[1] = 0;
info->bmversion[2] = 0;
strlcpy(info->bmname, "gennvm", sizeof(info->bmname));
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;
if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED &&
create.conf.e.rsv != 0) {
pr_err("nvm: reserved config field in use\n");
return -EINVAL;
}
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) {
__u32 flags = create.flags;
/* Check for valid flags */
if (flags & NVM_TARGET_FACTORY)
flags &= ~NVM_TARGET_FACTORY;
if (flags) {
pr_err("nvm: flag not 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;
struct nvm_dev *dev;
int ret = 0;
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;
}
list_for_each_entry(dev, &nvm_devices, devices) {
ret = nvm_remove_tgt(dev, &remove);
if (!ret)
break;
}
return ret;
}
/* kept for compatibility reasons */
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;
}
return 0;
}
/* Kept for compatibility reasons */
static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
{
struct nvm_ioctl_dev_factory fact;
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;
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,
};
builtin_misc_device(_nvm_misc);