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core.c
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core.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
* Initial release: Matias Bjorling <m@bjorling.me>
*/
#define pr_fmt(fmt) "nvm: " fmt
#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 num_lun;
int *lun_offs;
};
struct nvm_dev_map {
struct nvm_ch_map *chnls;
int num_ch;
};
static void nvm_free(struct kref *ref);
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("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->num_ch; 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->num_lun; j++) {
int lun = j + lun_offs[j];
int lunid = (ch * dev->geo.num_lun) + 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 num_lun = lun_end - lun_begin + 1;
int luns_left = num_lun;
int num_ch = num_lun / dev->geo.num_lun;
int num_ch_mod = num_lun % dev->geo.num_lun;
int bch = lun_begin / dev->geo.num_lun;
int blun = lun_begin % dev->geo.num_lun;
int lunid = 0;
int lun_balanced = 1;
int sec_per_lun, prev_num_lun;
int i, j;
num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1;
dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL);
if (!dev_map)
goto err_dev;
dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL);
if (!dev_map->chnls)
goto err_chnls;
luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL);
if (!luns)
goto err_luns;
prev_num_lun = (luns_left > dev->geo.num_lun) ?
dev->geo.num_lun : luns_left;
for (i = 0; i < num_ch; 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.num_lun) ?
dev->geo.num_lun : luns_left;
if (lun_balanced && prev_num_lun != luns_in_chnl)
lun_balanced = 0;
ch_map->ch_off = ch_rmap->ch_off = bch;
ch_map->num_lun = 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].a.ch = i;
luns[lunid++].a.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->num_ch = num_ch;
tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL);
if (!tgt_dev)
goto err_ch;
/* Inherit device geometry from parent */
memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo));
/* Target device only owns a portion of the physical device */
tgt_dev->geo.num_ch = num_ch;
tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1;
tgt_dev->geo.all_luns = num_lun;
tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk;
tgt_dev->geo.op = op;
sec_per_lun = dev->geo.clba * dev->geo.num_chk;
tgt_dev->geo.total_secs = num_lun * sec_per_lun;
tgt_dev->q = dev->q;
tgt_dev->map = dev_map;
tgt_dev->luns = luns;
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 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("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)
{
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;
} else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) {
pr_err("invalid over provisioning value\n");
return -EINVAL;
}
return nvm_config_check_luns(&dev->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;
unsigned int mdts;
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("config type not valid\n");
return -EINVAL;
}
tt = nvm_find_target_type(create->tgttype);
if (!tt) {
pr_err("target type %s not found\n", create->tgttype);
return -EINVAL;
}
if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) {
pr_err("device is incompatible with target L2P type.\n");
return -EINVAL;
}
if (nvm_target_exists(create->tgtname)) {
pr_err("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("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(dev->q->node);
if (!tqueue) {
ret = -ENOMEM;
goto err_disk;
}
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 = tt->bops;
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;
mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
if (dev->geo.mdts) {
mdts = min_t(u32, dev->geo.mdts,
(dev->geo.csecs >> 9) * NVM_MAX_VLBA);
}
blk_queue_max_hw_sectors(tqueue, mdts);
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, true);
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, bool graceful)
{
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, graceful);
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
* @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_ioctl_remove *remove)
{
struct nvm_target *t = NULL;
struct nvm_dev *dev;
down_read(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices) {
mutex_lock(&dev->mlock);
t = nvm_find_target(dev, remove->tgtname);
if (t) {
mutex_unlock(&dev->mlock);
break;
}
mutex_unlock(&dev->mlock);
}
up_read(&nvm_lock);
if (!t) {
pr_err("failed to remove target %s\n",
remove->tgtname);
return 1;
}
__nvm_remove_target(t, true);
kref_put(&dev->ref, nvm_free);
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.num_ch, sizeof(struct nvm_ch_map),
GFP_KERNEL);
if (!rmap->chnls)
goto err_chnls;
for (i = 0; i < dev->geo.num_ch; i++) {
struct nvm_ch_map *ch_rmap;
int *lun_roffs;
int luns_in_chnl = dev->geo.num_lun;
ch_rmap = &rmap->chnls[i];
ch_rmap->ch_off = -1;
ch_rmap->num_lun = 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.num_ch; 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->a.ch];
int lun_off = ch_map->lun_offs[p->a.lun];
p->a.ch += ch_map->ch_off;
p->a.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->a.ch];
int lun_roff = ch_rmap->lun_offs[p->a.lun];
p->a.ch -= ch_rmap->ch_off;
p->a.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->parent, 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->parent, 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)
{
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas);
}
static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
{
struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
nvm_ppa_dev_to_tgt(tgt_dev, 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->pln_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("failed to allocate dma memory\n");
return -ENOMEM;
}
plane_cnt = geo->pln_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);
}
static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
{
int flags = 0;
if (geo->version == NVM_OCSSD_SPEC_20)
return 0;
if (rqd->is_seq)
flags |= geo->pln_mode >> 1;
if (rqd->opcode == NVM_OP_PREAD)
flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND);
else if (rqd->opcode == NVM_OP_PWRITE)
flags |= NVM_IO_SCRAMBLE_ENABLE;
return flags;
}
int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf)
{
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;
rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
/* In case of error, fail with right address format */
ret = dev->ops->submit_io(dev, rqd, buf);
if (ret)
nvm_rq_dev_to_tgt(tgt_dev, rqd);
return ret;
}
EXPORT_SYMBOL(nvm_submit_io);
static void nvm_sync_end_io(struct nvm_rq *rqd)
{
struct completion *waiting = rqd->private;
complete(waiting);
}
static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
void *buf)
{
DECLARE_COMPLETION_ONSTACK(wait);
int ret = 0;
rqd->end_io = nvm_sync_end_io;
rqd->private = &wait;
ret = dev->ops->submit_io(dev, rqd, buf);
if (ret)
return ret;
wait_for_completion_io(&wait);
return 0;
}
int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
void *buf)
{
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;
rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
ret = nvm_submit_io_wait(dev, rqd, buf);
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);
static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
{
if (!dev->ops->submit_io)
return -ENODEV;
rqd->dev = NULL;
rqd->flags = nvm_set_flags(&dev->geo, rqd);
return nvm_submit_io_wait(dev, rqd, NULL);
}
static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
{
struct nvm_rq rqd = { NULL };
struct bio bio;
struct bio_vec bio_vec;
struct page *page;
int ret;
page = alloc_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
bio_init(&bio, &bio_vec, 1);
bio_add_page(&bio, page, PAGE_SIZE, 0);
bio_set_op_attrs(&bio, REQ_OP_READ, 0);
rqd.bio = &bio;
rqd.opcode = NVM_OP_PREAD;
rqd.is_seq = 1;
rqd.nr_ppas = 1;
rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
ret = nvm_submit_io_sync_raw(dev, &rqd);
if (ret)
return ret;
__free_page(page);
return rqd.error;
}
/*
* Scans a 1.2 chunk first and last page to determine if its state.
* If the chunk is found to be open, also scan it to update the write
* pointer.
*/
static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa,
struct nvm_chk_meta *meta)
{
struct nvm_geo *geo = &dev->geo;
int ret, pg, pl;
/* sense first page */
ret = nvm_bb_chunk_sense(dev, ppa);
if (ret < 0) /* io error */
return ret;
else if (ret == 0) /* valid data */
meta->state = NVM_CHK_ST_OPEN;
else if (ret > 0) {
/*
* If empty page, the chunk is free, else it is an
* actual io error. In that case, mark it offline.
*/
switch (ret) {
case NVM_RSP_ERR_EMPTYPAGE:
meta->state = NVM_CHK_ST_FREE;
return 0;
case NVM_RSP_ERR_FAILCRC:
case NVM_RSP_ERR_FAILECC:
case NVM_RSP_WARN_HIGHECC:
meta->state = NVM_CHK_ST_OPEN;
goto scan;
default:
return -ret; /* other io error */
}
}
/* sense last page */
ppa.g.pg = geo->num_pg - 1;
ppa.g.pl = geo->num_pln - 1;
ret = nvm_bb_chunk_sense(dev, ppa);
if (ret < 0) /* io error */
return ret;
else if (ret == 0) { /* Chunk fully written */
meta->state = NVM_CHK_ST_CLOSED;
meta->wp = geo->clba;
return 0;
} else if (ret > 0) {
switch (ret) {
case NVM_RSP_ERR_EMPTYPAGE:
case NVM_RSP_ERR_FAILCRC:
case NVM_RSP_ERR_FAILECC:
case NVM_RSP_WARN_HIGHECC:
meta->state = NVM_CHK_ST_OPEN;
break;
default:
return -ret; /* other io error */
}
}
scan:
/*
* chunk is open, we scan sequentially to update the write pointer.
* We make the assumption that targets write data across all planes
* before moving to the next page.
*/
for (pg = 0; pg < geo->num_pg; pg++) {
for (pl = 0; pl < geo->num_pln; pl++) {
ppa.g.pg = pg;
ppa.g.pl = pl;
ret = nvm_bb_chunk_sense(dev, ppa);
if (ret < 0) /* io error */
return ret;
else if (ret == 0) {
meta->wp += geo->ws_min;
} else if (ret > 0) {
switch (ret) {
case NVM_RSP_ERR_EMPTYPAGE:
return 0;
case NVM_RSP_ERR_FAILCRC:
case NVM_RSP_ERR_FAILECC:
case NVM_RSP_WARN_HIGHECC:
meta->wp += geo->ws_min;
break;
default:
return -ret; /* other io error */
}
}
}
}
return 0;
}
/*
* folds a bad block list from its plane representation to its
* chunk representation.
*
* If any of the planes status are bad or grown bad, the chunk is marked
* offline. If not bad, the first plane state acts as the chunk state.
*/
static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa,
u8 *blks, int nr_blks, struct nvm_chk_meta *meta)
{
struct nvm_geo *geo = &dev->geo;
int ret, blk, pl, offset, blktype;
for (blk = 0; blk < geo->num_chk; blk++) {
offset = blk * geo->pln_mode;
blktype = blks[offset];
for (pl = 0; pl < geo->pln_mode; pl++) {
if (blks[offset + pl] &
(NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) {
blktype = blks[offset + pl];
break;
}
}
ppa.g.blk = blk;
meta->wp = 0;
meta->type = NVM_CHK_TP_W_SEQ;
meta->wi = 0;
meta->slba = generic_to_dev_addr(dev, ppa).ppa;
meta->cnlb = dev->geo.clba;
if (blktype == NVM_BLK_T_FREE) {
ret = nvm_bb_chunk_scan(dev, ppa, meta);
if (ret)
return ret;
} else {
meta->state = NVM_CHK_ST_OFFLINE;
}
meta++;
}
return 0;
}
static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba,
int nchks, struct nvm_chk_meta *meta)
{
struct nvm_geo *geo = &dev->geo;