* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
- * Implementation of a generic nvm manager for Open-Channel SSDs.
+ * Implementation of a general nvm manager for Open-Channel SSDs.
*/
#include "gennvm.h"
-static int gennvm_get_area(struct nvm_dev *dev, sector_t *lba, sector_t len)
+static struct nvm_target *gen_find_target(struct gen_dev *gn, const char *name)
{
- struct gen_nvm *gn = dev->mp;
- struct gennvm_area *area, *prev, *next;
+ 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 gennvm_area), GFP_KERNEL);
+ area = kmalloc(sizeof(struct gen_area), GFP_KERNEL);
if (!area)
return -ENOMEM;
return 0;
}
-static void gennvm_put_area(struct nvm_dev *dev, sector_t begin)
+static void gen_put_area(struct nvm_dev *dev, sector_t begin)
{
- struct gen_nvm *gn = dev->mp;
- struct gennvm_area *area;
+ struct gen_dev *gn = dev->mp;
+ struct gen_area *area;
spin_lock(&dev->lock);
list_for_each_entry(area, &gn->area_list, list) {
spin_unlock(&dev->lock);
}
-static void gennvm_blocks_free(struct nvm_dev *dev)
+static void gen_blocks_free(struct nvm_dev *dev)
{
- struct gen_nvm *gn = dev->mp;
+ struct gen_dev *gn = dev->mp;
struct gen_lun *lun;
int i;
- gennvm_for_each_lun(gn, lun, i) {
+ gen_for_each_lun(gn, lun, i) {
if (!lun->vlun.blocks)
break;
vfree(lun->vlun.blocks);
}
}
-static void gennvm_luns_free(struct nvm_dev *dev)
+static void gen_luns_free(struct nvm_dev *dev)
{
- struct gen_nvm *gn = dev->mp;
+ struct gen_dev *gn = dev->mp;
kfree(gn->luns);
}
-static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn)
+static int gen_luns_init(struct nvm_dev *dev, struct gen_dev *gn)
{
struct gen_lun *lun;
int i;
if (!gn->luns)
return -ENOMEM;
- gennvm_for_each_lun(gn, lun, i) {
+ gen_for_each_lun(gn, lun, i) {
spin_lock_init(&lun->vlun.lock);
INIT_LIST_HEAD(&lun->free_list);
INIT_LIST_HEAD(&lun->used_list);
lun->vlun.lun_id = i % dev->luns_per_chnl;
lun->vlun.chnl_id = i / dev->luns_per_chnl;
lun->vlun.nr_free_blocks = dev->blks_per_lun;
- lun->vlun.nr_open_blocks = 0;
- lun->vlun.nr_closed_blocks = 0;
- lun->vlun.nr_bad_blocks = 0;
}
return 0;
}
-static int gennvm_block_bb(struct gen_nvm *gn, struct ppa_addr ppa,
+static int gen_block_bb(struct gen_dev *gn, struct ppa_addr ppa,
u8 *blks, int nr_blks)
{
struct nvm_dev *dev = gn->dev;
blk = &lun->vlun.blocks[i];
list_move_tail(&blk->list, &lun->bb_list);
- lun->vlun.nr_bad_blocks++;
lun->vlun.nr_free_blocks--;
}
return 0;
}
-static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
+static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
{
struct nvm_dev *dev = private;
- struct gen_nvm *gn = dev->mp;
+ struct gen_dev *gn = dev->mp;
u64 elba = slba + nlb;
struct gen_lun *lun;
struct nvm_block *blk;
int lun_id;
if (unlikely(elba > dev->total_secs)) {
- pr_err("gennvm: L2P data from device is out of bounds!\n");
+ pr_err("gen: L2P data from device is out of bounds!\n");
return -EINVAL;
}
u64 pba = le64_to_cpu(entries[i]);
if (unlikely(pba >= dev->total_secs && pba != U64_MAX)) {
- pr_err("gennvm: L2P data entry is out of bounds!\n");
+ pr_err("gen: L2P data entry is out of bounds!\n");
return -EINVAL;
}
* block state. The block is assumed to be open.
*/
list_move_tail(&blk->list, &lun->used_list);
- blk->state = NVM_BLK_ST_OPEN;
+ blk->state = NVM_BLK_ST_TGT;
lun->vlun.nr_free_blocks--;
- lun->vlun.nr_open_blocks++;
}
}
return 0;
}
-static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
+static int gen_blocks_init(struct nvm_dev *dev, struct gen_dev *gn)
{
struct gen_lun *lun;
struct nvm_block *block;
if (!blks)
return -ENOMEM;
- gennvm_for_each_lun(gn, lun, lun_iter) {
+ gen_for_each_lun(gn, lun, lun_iter) {
lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) *
dev->blks_per_lun);
if (!lun->vlun.blocks) {
ret = nvm_get_bb_tbl(dev, ppa, blks);
if (ret)
- pr_err("gennvm: could not get BB table\n");
+ pr_err("gen: could not get BB table\n");
- ret = gennvm_block_bb(gn, ppa, blks, nr_blks);
+ ret = gen_block_bb(gn, ppa, blks, nr_blks);
if (ret)
- pr_err("gennvm: BB table map failed\n");
+ 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,
- gennvm_block_map, dev);
+ gen_block_map, dev);
if (ret) {
- pr_err("gennvm: could not read L2P table.\n");
- pr_warn("gennvm: default block initialization");
+ pr_err("gen: could not read L2P table.\n");
+ pr_warn("gen: default block initialization");
}
}
return 0;
}
-static void gennvm_free(struct nvm_dev *dev)
+static void gen_free(struct nvm_dev *dev)
{
- gennvm_blocks_free(dev);
- gennvm_luns_free(dev);
+ gen_blocks_free(dev);
+ gen_luns_free(dev);
kfree(dev->mp);
dev->mp = NULL;
}
-static int gennvm_register(struct nvm_dev *dev)
+static int gen_register(struct nvm_dev *dev)
{
- struct gen_nvm *gn;
+ struct gen_dev *gn;
int ret;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
- gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL);
+ 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 = gennvm_luns_init(dev, gn);
+ ret = gen_luns_init(dev, gn);
if (ret) {
- pr_err("gennvm: could not initialize luns\n");
+ pr_err("gen: could not initialize luns\n");
goto err;
}
- ret = gennvm_blocks_init(dev, gn);
+ ret = gen_blocks_init(dev, gn);
if (ret) {
- pr_err("gennvm: could not initialize blocks\n");
+ pr_err("gen: could not initialize blocks\n");
goto err;
}
return 1;
err:
- gennvm_free(dev);
+ gen_free(dev);
module_put(THIS_MODULE);
return ret;
}
-static void gennvm_unregister(struct nvm_dev *dev)
+static void gen_unregister(struct nvm_dev *dev)
{
- gennvm_free(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 *gennvm_get_blk_unlocked(struct nvm_dev *dev,
+static struct nvm_block *gen_get_blk(struct nvm_dev *dev,
struct nvm_lun *vlun, unsigned long flags)
{
struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
struct nvm_block *blk = NULL;
int is_gc = flags & NVM_IOTYPE_GC;
- assert_spin_locked(&vlun->lock);
-
+ spin_lock(&vlun->lock);
if (list_empty(&lun->free_list)) {
- pr_err_ratelimited("gennvm: lun %u have no free pages available",
+ pr_err_ratelimited("gen: lun %u have no free pages available",
lun->vlun.id);
goto out;
}
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_OPEN;
+ list_move_tail(&blk->list, &lun->used_list);
+ blk->state = NVM_BLK_ST_TGT;
lun->vlun.nr_free_blocks--;
- lun->vlun.nr_open_blocks++;
-
out:
- return blk;
-}
-
-static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
- struct nvm_lun *vlun, unsigned long flags)
-{
- struct nvm_block *blk;
-
- spin_lock(&vlun->lock);
- blk = gennvm_get_blk_unlocked(dev, vlun, flags);
spin_unlock(&vlun->lock);
return blk;
}
-static void gennvm_put_blk_unlocked(struct nvm_dev *dev, struct nvm_block *blk)
+static void gen_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
{
struct nvm_lun *vlun = blk->lun;
struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
- assert_spin_locked(&vlun->lock);
-
- if (blk->state & NVM_BLK_ST_OPEN) {
- list_move_tail(&blk->list, &lun->free_list);
- lun->vlun.nr_open_blocks--;
- lun->vlun.nr_free_blocks++;
- blk->state = NVM_BLK_ST_FREE;
- } else if (blk->state & NVM_BLK_ST_CLOSED) {
+ spin_lock(&vlun->lock);
+ if (blk->state & NVM_BLK_ST_TGT) {
list_move_tail(&blk->list, &lun->free_list);
- lun->vlun.nr_closed_blocks--;
lun->vlun.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);
- lun->vlun.nr_bad_blocks++;
blk->state = NVM_BLK_ST_BAD;
} else {
WARN_ON_ONCE(1);
- pr_err("gennvm: erroneous block type (%lu -> %u)\n",
+ pr_err("gen: erroneous block type (%lu -> %u)\n",
blk->id, blk->state);
list_move_tail(&blk->list, &lun->bb_list);
- lun->vlun.nr_bad_blocks++;
- blk->state = NVM_BLK_ST_BAD;
}
-}
-
-static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
-{
- struct nvm_lun *vlun = blk->lun;
-
- spin_lock(&vlun->lock);
- gennvm_put_blk_unlocked(dev, blk);
spin_unlock(&vlun->lock);
}
-static void gennvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
+static void gen_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
{
- struct gen_nvm *gn = dev->mp;
+ struct gen_dev *gn = dev->mp;
struct gen_lun *lun;
struct nvm_block *blk;
- pr_debug("gennvm: ppa (ch: %u lun: %u blk: %u pg: %u) -> %u\n",
+ 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("gennvm: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u",
+ 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[ppa.g.lun * ppa.g.ch];
+ lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
blk = &lun->vlun.blocks[ppa.g.blk];
/* will be moved to bb list on put_blk from target */
}
/*
- * mark block bad in gennvm. It is expected that the target recovers separately
+ * mark block bad in gen. It is expected that the target recovers separately
*/
-static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
+static void gen_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
{
int bit = -1;
int max_secs = dev->ops->max_phys_sect;
/* look up blocks and mark them as bad */
if (rqd->nr_ppas == 1) {
- gennvm_mark_blk(dev, rqd->ppa_addr, NVM_BLK_ST_BAD);
+ gen_mark_blk(dev, rqd->ppa_addr, NVM_BLK_ST_BAD);
return;
}
while ((bit = find_next_bit(comp_bits, max_secs, bit + 1)) < max_secs)
- gennvm_mark_blk(dev, rqd->ppa_list[bit], NVM_BLK_ST_BAD);
+ gen_mark_blk(dev, rqd->ppa_list[bit], NVM_BLK_ST_BAD);
}
-static void gennvm_end_io(struct nvm_rq *rqd)
+static void gen_end_io(struct nvm_rq *rqd)
{
struct nvm_tgt_instance *ins = rqd->ins;
if (rqd->error == NVM_RSP_ERR_FAILWRITE)
- gennvm_mark_blk_bad(rqd->dev, rqd);
+ gen_mark_blk_bad(rqd->dev, rqd);
ins->tt->end_io(rqd);
}
-static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
+static int gen_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
{
if (!dev->ops->submit_io)
return -ENODEV;
nvm_generic_to_addr_mode(dev, rqd);
rqd->dev = dev;
- rqd->end_io = gennvm_end_io;
+ rqd->end_io = gen_end_io;
return dev->ops->submit_io(dev, rqd);
}
-static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
+static int gen_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
unsigned long flags)
{
struct ppa_addr addr = block_to_ppa(dev, blk);
return nvm_erase_ppa(dev, &addr, 1);
}
-static int gennvm_reserve_lun(struct nvm_dev *dev, int lunid)
+static int gen_reserve_lun(struct nvm_dev *dev, int lunid)
{
return test_and_set_bit(lunid, dev->lun_map);
}
-static void gennvm_release_lun(struct nvm_dev *dev, int lunid)
+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 *gennvm_get_lun(struct nvm_dev *dev, int lunid)
+static struct nvm_lun *gen_get_lun(struct nvm_dev *dev, int lunid)
{
- struct gen_nvm *gn = dev->mp;
+ struct gen_dev *gn = dev->mp;
if (unlikely(lunid >= dev->nr_luns))
return NULL;
return &gn->luns[lunid].vlun;
}
-static void gennvm_lun_info_print(struct nvm_dev *dev)
+static void gen_lun_info_print(struct nvm_dev *dev)
{
- struct gen_nvm *gn = dev->mp;
+ struct gen_dev *gn = dev->mp;
struct gen_lun *lun;
unsigned int i;
- gennvm_for_each_lun(gn, lun, i) {
+ gen_for_each_lun(gn, lun, i) {
spin_lock(&lun->vlun.lock);
- pr_info("%s: lun%8u\t%u\t%u\t%u\t%u\n",
- dev->name, i,
- lun->vlun.nr_free_blocks,
- lun->vlun.nr_open_blocks,
- lun->vlun.nr_closed_blocks,
- lun->vlun.nr_bad_blocks);
+ pr_info("%s: lun%8u\t%u\n", dev->name, i,
+ lun->vlun.nr_free_blocks);
spin_unlock(&lun->vlun.lock);
}
}
-static struct nvmm_type gennvm = {
+static struct nvmm_type gen = {
.name = "gennvm",
.version = {0, 1, 0},
- .register_mgr = gennvm_register,
- .unregister_mgr = gennvm_unregister,
+ .register_mgr = gen_register,
+ .unregister_mgr = gen_unregister,
- .get_blk_unlocked = gennvm_get_blk_unlocked,
- .put_blk_unlocked = gennvm_put_blk_unlocked,
+ .create_tgt = gen_create_tgt,
+ .remove_tgt = gen_remove_tgt,
- .get_blk = gennvm_get_blk,
- .put_blk = gennvm_put_blk,
+ .get_blk = gen_get_blk,
+ .put_blk = gen_put_blk,
- .submit_io = gennvm_submit_io,
- .erase_blk = gennvm_erase_blk,
+ .submit_io = gen_submit_io,
+ .erase_blk = gen_erase_blk,
- .mark_blk = gennvm_mark_blk,
+ .mark_blk = gen_mark_blk,
- .get_lun = gennvm_get_lun,
- .reserve_lun = gennvm_reserve_lun,
- .release_lun = gennvm_release_lun,
- .lun_info_print = gennvm_lun_info_print,
+ .get_lun = gen_get_lun,
+ .reserve_lun = gen_reserve_lun,
+ .release_lun = gen_release_lun,
+ .lun_info_print = gen_lun_info_print,
- .get_area = gennvm_get_area,
- .put_area = gennvm_put_area,
+ .get_area = gen_get_area,
+ .put_area = gen_put_area,
};
-static int __init gennvm_module_init(void)
+static int __init gen_module_init(void)
{
- return nvm_register_mgr(&gennvm);
+ return nvm_register_mgr(&gen);
}
-static void gennvm_module_exit(void)
+static void gen_module_exit(void)
{
- nvm_unregister_mgr(&gennvm);
+ nvm_unregister_mgr(&gen);
}
-module_init(gennvm_module_init);
-module_exit(gennvm_module_exit);
+module_init(gen_module_init);
+module_exit(gen_module_exit);
MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Generic media manager for Open-Channel SSDs");
+MODULE_DESCRIPTION("General media manager for Open-Channel SSDs");
projects / cascardo / linux.git / blobdiff