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core.c
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/*
* Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
* Initial release: Matias Bjorling <[email protected]>
*
* 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/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;
};
struct nvm_area {
struct list_head list;
sector_t begin;
sector_t end; /* end is excluded */
};
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 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.luns_per_chnl) + 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,
int lun_begin, int lun_end)
{
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.luns_per_chnl;
int nr_chnls_mod = nr_luns % dev->geo.luns_per_chnl;
int bch = lun_begin / dev->geo.luns_per_chnl;
int blun = lun_begin % dev->geo.luns_per_chnl;
int lunid = 0;
int lun_balanced = 1;
int prev_nr_luns;
int i, j;
nr_chnls = nr_luns / dev->geo.luns_per_chnl;
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.luns_per_chnl) ?
dev->geo.luns_per_chnl : 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.luns_per_chnl) ?
dev->geo.luns_per_chnl : 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.nr_luns = nr_luns;
tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1;
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 int nvm_create_tgt(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;
struct nvm_tgt_dev *tgt_dev;
void *targetdata;
int ret;
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(&dev->mlock);
t = nvm_find_target(dev, create->tgtname);
if (t) {
pr_err("nvm: target name already exists.\n");
mutex_unlock(&dev->mlock);
return -EINVAL;
}
mutex_unlock(&dev->mlock);
ret = nvm_reserve_luns(dev, s->lun_begin, s->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, s->lun_begin, s->lun_end);
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);
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, s->lun_begin, s->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);
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.luns_per_chnl;
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);
}
void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
int len)
{
struct nvm_geo *geo = &dev->geo;
struct nvm_dev_map *dev_rmap = dev->rmap;
u64 i;
for (i = 0; i < len; i++) {
struct nvm_ch_map *ch_rmap;
int *lun_roffs;
struct ppa_addr gaddr;
u64 pba = le64_to_cpu(entries[i]);
u64 diff;
if (!pba)
continue;
gaddr = linear_to_generic_addr(geo, pba);
ch_rmap = &dev_rmap->chnls[gaddr.g.ch];
lun_roffs = ch_rmap->lun_offs;
diff = ((ch_rmap->ch_off * geo->luns_per_chnl) +
(lun_roffs[gaddr.g.lun])) * geo->sec_per_lun;
entries[i] -= cpu_to_le64(diff);
}
}
EXPORT_SYMBOL(nvm_part_to_tgt);
struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock)
{
struct nvm_tgt_type *tmp, *tt = NULL;
if (lock)
down_write(&nvm_tgtt_lock);
list_for_each_entry(tmp, &nvm_tgt_types, list)
if (!strcmp(name, tmp->name)) {
tt = tmp;
break;
}
if (lock)
up_write(&nvm_tgtt_lock);
return tt;
}
EXPORT_SYMBOL(nvm_find_target_type);
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, 0))
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_lock);
list_del(&tt->list);
up_write(&nvm_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;
}
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, 1);
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);
static void nvm_end_io_sync(struct nvm_rq *rqd)
{
struct completion *waiting = rqd->private;
complete(waiting);
}
int nvm_erase_sync(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
int nr_ppas)
{
struct nvm_geo *geo = &tgt_dev->geo;
struct nvm_rq rqd;
int ret;
DECLARE_COMPLETION_ONSTACK(wait);
memset(&rqd, 0, sizeof(struct nvm_rq));
rqd.opcode = NVM_OP_ERASE;
rqd.end_io = nvm_end_io_sync;
rqd.private = &wait;
rqd.flags = geo->plane_mode >> 1;
ret = nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas, 1);
if (ret)
return ret;
ret = nvm_submit_io(tgt_dev, &rqd);
if (ret) {
pr_err("rrpr: erase I/O submission failed: %d\n", ret);
goto free_ppa_list;
}
wait_for_completion_io(&wait);
free_ppa_list:
nvm_free_rqd_ppalist(tgt_dev, &rqd);
return ret;
}
EXPORT_SYMBOL(nvm_erase_sync);
int nvm_get_l2p_tbl(struct nvm_tgt_dev *tgt_dev, u64 slba, u32 nlb,
nvm_l2p_update_fn *update_l2p, void *priv)
{
struct nvm_dev *dev = tgt_dev->parent;
if (!dev->ops->get_l2p_tbl)
return 0;
return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
}
EXPORT_SYMBOL(nvm_get_l2p_tbl);
int nvm_get_area(struct nvm_tgt_dev *tgt_dev, sector_t *lba, sector_t len)
{
struct nvm_dev *dev = tgt_dev->parent;
struct nvm_geo *geo = &dev->geo;
struct nvm_area *area, *prev, *next;
sector_t begin = 0;
sector_t max_sectors = (geo->sec_size * dev->total_secs) >> 9;
if (len > max_sectors)
return -EINVAL;
area = kmalloc(sizeof(struct nvm_area), GFP_KERNEL);
if (!area)
return -ENOMEM;
prev = NULL;
spin_lock(&dev->lock);
list_for_each_entry(next, &dev->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, &dev->area_list);
spin_unlock(&dev->lock);
return 0;
}
EXPORT_SYMBOL(nvm_get_area);
void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin)
{
struct nvm_dev *dev = tgt_dev->parent;
struct nvm_area *area;
spin_lock(&dev->lock);
list_for_each_entry(area, &dev->area_list, list) {
if (area->begin != begin)
continue;
list_del(&area->list);
spin_unlock(&dev->lock);
kfree(area);
return;
}
spin_unlock(&dev->lock);
}
EXPORT_SYMBOL(nvm_put_area);
int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
const struct ppa_addr *ppas, int nr_ppas, int vblk)
{
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 ((!vblk || 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;
}
if (!vblk) {
for (i = 0; i < nr_ppas; i++)
rqd->ppa_list[i] = ppas[i];
} else {
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;
}
EXPORT_SYMBOL(nvm_set_rqd_ppalist);
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);
}
EXPORT_SYMBOL(nvm_free_rqd_ppalist);
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->blks_per_lun * geo->plane_mode)
return -EINVAL;
for (blk = 0; blk < geo->blks_per_lun; 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->blks_per_lun;
}
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_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
{
struct nvm_geo *geo = &dev->geo;
int i;
dev->lps_per_blk = geo->pgs_per_blk;
dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
if (!dev->lptbl)
return -ENOMEM;
/* Just a linear array */
for (i = 0; i < dev->lps_per_blk; i++)
dev->lptbl[i] = i;
return 0;
}
static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
{
int i, p;
struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
if (!mlc->num_pairs)
return 0;
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->grp;
struct nvm_geo *geo = &dev->geo;
int ret;
/* Whole device values */
geo->nr_chnls = grp->num_ch;
geo->luns_per_chnl = grp->num_lun;
/* Generic device values */
geo->pgs_per_blk = grp->num_pg;
geo->blks_per_lun = grp->num_blk;
geo->nr_planes = grp->num_pln;
geo->fpg_size = grp->fpg_sz;
geo->pfpg_size = grp->fpg_sz * grp->num_pln;
geo->sec_size = grp->csecs;
geo->oob_size = grp->sos;
geo->sec_per_pg = grp->fpg_sz / grp->csecs;
geo->mccap = grp->mccap;
memcpy(&geo->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
geo->plane_mode = NVM_PLANE_SINGLE;
geo->max_rq_size = dev->ops->max_phys_sect * geo->sec_size;
if (grp->mpos & 0x020202)
geo->plane_mode = NVM_PLANE_DOUBLE;
if (grp->mpos & 0x040404)
geo->plane_mode = NVM_PLANE_QUAD;
if (grp->mtype != 0) {
pr_err("nvm: memory type not supported\n");
return -EINVAL;
}
/* calculated values */
geo->sec_per_pl = geo->sec_per_pg * geo->nr_planes;
geo->sec_per_blk = geo->sec_per_pl * geo->pgs_per_blk;
geo->sec_per_lun = geo->sec_per_blk * geo->blks_per_lun;
geo->nr_luns = geo->luns_per_chnl * geo->nr_chnls;
dev->total_secs = geo->nr_luns * geo->sec_per_lun;
dev->lun_map = kcalloc(BITS_TO_LONGS(geo->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;