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authorJavier González <jg@lightnvm.io>2016-11-28 22:39:09 +0100
committerJens Axboe <axboe@fb.com>2016-11-29 12:12:51 -0700
commit2a02e627c245bfa987b97707123d7747d7b0e486 (patch)
tree321f42522eaf00fa29a0a05612c11e4b515e92d5 /drivers/lightnvm/rrpc.c
parenteec44565e9ab13bbf5b48864a68871eabf1115c1 (diff)
downloadop-kernel-dev-2a02e627c245bfa987b97707123d7747d7b0e486.zip
op-kernel-dev-2a02e627c245bfa987b97707123d7747d7b0e486.tar.gz
lightnvm: eliminate nvm_block abstraction on mm
In order to naturally support multi-target instances on an Open-Channel SSD, targets should own the LUNs they get blocks from and manage provisioning internally. This is done in several steps. A part of this transformation is that targets manage their blocks internally. This patch eliminates the nvm_block abstraction and moves block management to the target logic. The rrpc target is transformed. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/lightnvm/rrpc.c')
-rw-r--r--drivers/lightnvm/rrpc.c234
1 files changed, 169 insertions, 65 deletions
diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 165b9d3..a352285d 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -126,19 +126,21 @@ static int block_is_full(struct rrpc *rrpc, struct rrpc_block *rblk)
static u64 block_to_rel_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
{
struct nvm_tgt_dev *dev = rrpc->dev;
- struct nvm_block *blk = rblk->parent;
- int lun_blk = blk->id % (dev->geo.blks_per_lun * rrpc->nr_luns);
+ struct rrpc_lun *rlun = rblk->rlun;
+ struct nvm_lun *lun = rlun->parent;
- return lun_blk * dev->geo.sec_per_blk;
+ return lun->id * dev->geo.sec_per_blk;
}
/* Calculate global addr for the given block */
static u64 block_to_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
{
struct nvm_tgt_dev *dev = rrpc->dev;
- struct nvm_block *blk = rblk->parent;
+ struct nvm_geo *geo = &dev->geo;
+ struct rrpc_lun *rlun = rblk->rlun;
+ struct nvm_lun *lun = rlun->parent;
- return blk->id * dev->geo.sec_per_blk;
+ return lun->id * geo->sec_per_lun + rblk->id * geo->sec_per_blk;
}
static struct ppa_addr rrpc_ppa_to_gaddr(struct nvm_tgt_dev *dev, u64 addr)
@@ -163,51 +165,46 @@ static void rrpc_set_lun_cur(struct rrpc_lun *rlun, struct rrpc_block *new_rblk,
*cur_rblk = new_rblk;
}
-static struct nvm_block *__rrpc_get_blk(struct rrpc *rrpc,
+static struct rrpc_block *__rrpc_get_blk(struct rrpc *rrpc,
struct rrpc_lun *rlun)
{
- struct nvm_lun *lun = rlun->parent;
- struct nvm_block *blk = NULL;
+ struct rrpc_block *rblk = NULL;
- if (list_empty(&lun->free_list))
+ if (list_empty(&rlun->free_list))
goto out;
- blk = list_first_entry(&lun->free_list, struct nvm_block, list);
+ rblk = list_first_entry(&rlun->free_list, struct rrpc_block, list);
- list_move_tail(&blk->list, &lun->used_list);
- blk->state = NVM_BLK_ST_TGT;
- lun->nr_free_blocks--;
+ list_move_tail(&rblk->list, &rlun->used_list);
+ rblk->state = NVM_BLK_ST_TGT;
+ rlun->nr_free_blocks--;
out:
- return blk;
+ return rblk;
}
static struct rrpc_block *rrpc_get_blk(struct rrpc *rrpc, struct rrpc_lun *rlun,
unsigned long flags)
{
struct nvm_tgt_dev *dev = rrpc->dev;
- struct nvm_lun *lun = rlun->parent;
- struct nvm_block *blk;
struct rrpc_block *rblk;
int is_gc = flags & NVM_IOTYPE_GC;
spin_lock(&rlun->lock);
- if (!is_gc && lun->nr_free_blocks < rlun->reserved_blocks) {
+ if (!is_gc && rlun->nr_free_blocks < rlun->reserved_blocks) {
pr_err("nvm: rrpc: cannot give block to non GC request\n");
spin_unlock(&rlun->lock);
return NULL;
}
- blk = __rrpc_get_blk(rrpc, rlun);
- if (!blk) {
+ rblk = __rrpc_get_blk(rrpc, rlun);
+ if (!rblk) {
pr_err("nvm: rrpc: cannot get new block\n");
spin_unlock(&rlun->lock);
return NULL;
}
spin_unlock(&rlun->lock);
- rblk = rrpc_get_rblk(rlun, blk->id);
- blk->priv = rblk;
bitmap_zero(rblk->invalid_pages, dev->geo.sec_per_blk);
rblk->next_page = 0;
rblk->nr_invalid_pages = 0;
@@ -218,23 +215,23 @@ static struct rrpc_block *rrpc_get_blk(struct rrpc *rrpc, struct rrpc_lun *rlun,
static void rrpc_put_blk(struct rrpc *rrpc, struct rrpc_block *rblk)
{
- struct nvm_block *blk = rblk->parent;
struct rrpc_lun *rlun = rblk->rlun;
struct nvm_lun *lun = rlun->parent;
spin_lock(&rlun->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;
+ if (rblk->state & NVM_BLK_ST_TGT) {
+ list_move_tail(&rblk->list, &rlun->free_list);
+ rlun->nr_free_blocks++;
+ rblk->state = NVM_BLK_ST_FREE;
+ } else if (rblk->state & NVM_BLK_ST_BAD) {
+ list_move_tail(&rblk->list, &rlun->bb_list);
+ rblk->state = NVM_BLK_ST_BAD;
} else {
WARN_ON_ONCE(1);
- pr_err("rrpc: erroneous block type (%lu -> %u)\n",
- blk->id, blk->state);
- list_move_tail(&blk->list, &lun->bb_list);
+ pr_err("rrpc: erroneous type (ch:%d,lun:%d,blk%d-> %u)\n",
+ lun->chnl_id, lun->lun_id,
+ rblk->id, rblk->state);
+ list_move_tail(&rblk->list, &rlun->bb_list);
}
spin_unlock(&rlun->lock);
}
@@ -334,7 +331,7 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
nr_sec_per_blk)) < nr_sec_per_blk) {
/* Lock laddr */
- phys_addr = rblk->parent->id * nr_sec_per_blk + slot;
+ phys_addr = rrpc_blk_to_ppa(rrpc, rblk) + slot;
try:
spin_lock(&rrpc->rev_lock);
@@ -422,14 +419,22 @@ static void rrpc_block_gc(struct work_struct *work)
struct rrpc_block *rblk = gcb->rblk;
struct rrpc_lun *rlun = rblk->rlun;
struct nvm_tgt_dev *dev = rrpc->dev;
+ struct ppa_addr ppa;
mempool_free(gcb, rrpc->gcb_pool);
- pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id);
+ pr_debug("nvm: block 'ch:%d,lun:%d,blk:%d' being reclaimed\n",
+ rlun->parent->chnl_id, rlun->parent->lun_id,
+ rblk->id);
if (rrpc_move_valid_pages(rrpc, rblk))
goto put_back;
- if (nvm_erase_blk(dev->parent, rblk->parent, 0))
+ ppa.ppa = 0;
+ ppa.g.ch = rlun->parent->chnl_id;
+ ppa.g.lun = rlun->parent->lun_id;
+ ppa.g.blk = rblk->id;
+
+ if (nvm_erase_blk(dev->parent, &ppa, 0))
goto put_back;
rrpc_put_blk(rrpc, rblk);
@@ -445,7 +450,7 @@ put_back:
/* the block with highest number of invalid pages, will be in the beginning
* of the list
*/
-static struct rrpc_block *rblock_max_invalid(struct rrpc_block *ra,
+static struct rrpc_block *rblk_max_invalid(struct rrpc_block *ra,
struct rrpc_block *rb)
{
if (ra->nr_invalid_pages == rb->nr_invalid_pages)
@@ -460,13 +465,13 @@ static struct rrpc_block *rblock_max_invalid(struct rrpc_block *ra,
static struct rrpc_block *block_prio_find_max(struct rrpc_lun *rlun)
{
struct list_head *prio_list = &rlun->prio_list;
- struct rrpc_block *rblock, *max;
+ struct rrpc_block *rblk, *max;
BUG_ON(list_empty(prio_list));
max = list_first_entry(prio_list, struct rrpc_block, prio);
- list_for_each_entry(rblock, prio_list, prio)
- max = rblock_max_invalid(max, rblock);
+ list_for_each_entry(rblk, prio_list, prio)
+ max = rblk_max_invalid(max, rblk);
return max;
}
@@ -476,7 +481,6 @@ static void rrpc_lun_gc(struct work_struct *work)
struct rrpc_lun *rlun = container_of(work, struct rrpc_lun, ws_gc);
struct rrpc *rrpc = rlun->rrpc;
struct nvm_tgt_dev *dev = rrpc->dev;
- struct nvm_lun *lun = rlun->parent;
struct rrpc_block_gc *gcb;
unsigned int nr_blocks_need;
@@ -486,26 +490,28 @@ static void rrpc_lun_gc(struct work_struct *work)
nr_blocks_need = rrpc->nr_luns;
spin_lock(&rlun->lock);
- while (nr_blocks_need > lun->nr_free_blocks &&
+ while (nr_blocks_need > rlun->nr_free_blocks &&
!list_empty(&rlun->prio_list)) {
- struct rrpc_block *rblock = block_prio_find_max(rlun);
- struct nvm_block *block = rblock->parent;
+ struct rrpc_block *rblk = block_prio_find_max(rlun);
- if (!rblock->nr_invalid_pages)
+ if (!rblk->nr_invalid_pages)
break;
gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC);
if (!gcb)
break;
- list_del_init(&rblock->prio);
+ list_del_init(&rblk->prio);
- BUG_ON(!block_is_full(rrpc, rblock));
+ WARN_ON(!block_is_full(rrpc, rblk));
- pr_debug("rrpc: selected block '%lu' for GC\n", block->id);
+ pr_debug("rrpc: selected block 'ch:%d,lun:%d,blk:%d' for GC\n",
+ rlun->parent->chnl_id,
+ rlun->parent->lun_id,
+ rblk->id);
gcb->rrpc = rrpc;
- gcb->rblk = rblock;
+ gcb->rblk = rblk;
INIT_WORK(&gcb->ws_gc, rrpc_block_gc);
queue_work(rrpc->kgc_wq, &gcb->ws_gc);
@@ -530,8 +536,10 @@ static void rrpc_gc_queue(struct work_struct *work)
spin_unlock(&rlun->lock);
mempool_free(gcb, rrpc->gcb_pool);
- pr_debug("nvm: block '%lu' is full, allow GC (sched)\n",
- rblk->parent->id);
+ pr_debug("nvm: block 'ch:%d,lun:%d,blk:%d' full, allow GC (sched)\n",
+ rlun->parent->chnl_id,
+ rlun->parent->lun_id,
+ rblk->id);
}
static const struct block_device_operations rrpc_fops = {
@@ -555,8 +563,7 @@ static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc)
* estimate.
*/
rrpc_for_each_lun(rrpc, rlun, i) {
- if (rlun->parent->nr_free_blocks >
- max_free->parent->nr_free_blocks)
+ if (rlun->nr_free_blocks > max_free->nr_free_blocks)
max_free = rlun;
}
@@ -613,14 +620,12 @@ static struct rrpc_addr *rrpc_map_page(struct rrpc *rrpc, sector_t laddr,
{
struct rrpc_lun *rlun;
struct rrpc_block *rblk, **cur_rblk;
- struct nvm_lun *lun;
u64 paddr;
int gc_force = 0;
rlun = rrpc_get_lun_rr(rrpc, is_gc);
- lun = rlun->parent;
- if (!is_gc && lun->nr_free_blocks < rrpc->nr_luns * 4)
+ if (!is_gc && rlun->nr_free_blocks < rrpc->nr_luns * 4)
return NULL;
/*
@@ -701,22 +706,44 @@ static void rrpc_run_gc(struct rrpc *rrpc, struct rrpc_block *rblk)
queue_work(rrpc->kgc_wq, &gcb->ws_gc);
}
-static void __rrpc_mark_bad_block(struct nvm_tgt_dev *dev, struct ppa_addr *ppa)
+static struct rrpc_lun *rrpc_ppa_to_lun(struct rrpc *rrpc, struct ppa_addr p)
{
- nvm_mark_blk(dev->parent, *ppa, NVM_BLK_ST_BAD);
- nvm_set_bb_tbl(dev->parent, ppa, 1, NVM_BLK_T_GRWN_BAD);
+ struct rrpc_lun *rlun = NULL;
+ int i;
+
+ for (i = 0; i < rrpc->nr_luns; i++) {
+ if (rrpc->luns[i].parent->chnl_id == p.g.ch &&
+ rrpc->luns[i].parent->lun_id == p.g.lun) {
+ rlun = &rrpc->luns[i];
+ break;
+ }
+ }
+
+ return rlun;
}
-static void rrpc_mark_bad_block(struct rrpc *rrpc, struct nvm_rq *rqd)
+static void __rrpc_mark_bad_block(struct rrpc *rrpc, struct ppa_addr ppa)
{
struct nvm_tgt_dev *dev = rrpc->dev;
+ struct rrpc_lun *rlun;
+ struct rrpc_block *rblk;
+
+ rlun = rrpc_ppa_to_lun(rrpc, ppa);
+ rblk = &rlun->blocks[ppa.g.blk];
+ rblk->state = NVM_BLK_ST_BAD;
+
+ nvm_set_bb_tbl(dev->parent, &ppa, 1, NVM_BLK_T_GRWN_BAD);
+}
+
+static void rrpc_mark_bad_block(struct rrpc *rrpc, struct nvm_rq *rqd)
+{
void *comp_bits = &rqd->ppa_status;
struct ppa_addr ppa, prev_ppa;
int nr_ppas = rqd->nr_ppas;
int bit;
if (rqd->nr_ppas == 1)
- __rrpc_mark_bad_block(dev, &rqd->ppa_addr);
+ __rrpc_mark_bad_block(rrpc, rqd->ppa_addr);
ppa_set_empty(&prev_ppa);
bit = -1;
@@ -725,7 +752,7 @@ static void rrpc_mark_bad_block(struct rrpc *rrpc, struct nvm_rq *rqd)
if (ppa_cmp_blk(ppa, prev_ppa))
continue;
- __rrpc_mark_bad_block(dev, &ppa);
+ __rrpc_mark_bad_block(rrpc, ppa);
}
}
@@ -735,13 +762,11 @@ static void rrpc_end_io_write(struct rrpc *rrpc, struct rrpc_rq *rrqd,
struct nvm_tgt_dev *dev = rrpc->dev;
struct rrpc_addr *p;
struct rrpc_block *rblk;
- struct nvm_lun *lun;
int cmnt_size, i;
for (i = 0; i < npages; i++) {
p = &rrpc->trans_map[laddr + i];
rblk = p->rblk;
- lun = rblk->parent->lun;
cmnt_size = atomic_inc_return(&rblk->data_cmnt_size);
if (unlikely(cmnt_size == dev->geo.sec_per_blk))
@@ -1061,16 +1086,21 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
struct nvm_tgt_dev *dev = rrpc->dev;
struct rrpc_addr *addr = rrpc->trans_map + slba;
struct rrpc_rev_addr *raddr = rrpc->rev_trans_map;
+ struct rrpc_lun *rlun;
+ struct rrpc_block *rblk;
u64 i;
for (i = 0; i < nlb; i++) {
+ struct ppa_addr gaddr;
u64 pba = le64_to_cpu(entries[i]);
unsigned int mod;
+
/* LNVM treats address-spaces as silos, LBA and PBA are
* equally large and zero-indexed.
*/
if (unlikely(pba >= dev->total_secs && pba != U64_MAX)) {
pr_err("nvm: L2P data entry is out of bounds!\n");
+ pr_err("nvm: Maybe loaded an old target L2P\n");
return -EINVAL;
}
@@ -1085,6 +1115,25 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
addr[i].addr = pba;
raddr[mod].addr = slba + i;
+
+ gaddr = rrpc_ppa_to_gaddr(dev, pba);
+ rlun = rrpc_ppa_to_lun(rrpc, gaddr);
+ if (!rlun) {
+ pr_err("rrpc: l2p corruption on lba %llu\n",
+ slba + i);
+ return -EINVAL;
+ }
+
+ rblk = &rlun->blocks[gaddr.g.blk];
+ if (!rblk->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(&rblk->list, &rlun->used_list);
+ rblk->state = NVM_BLK_ST_TGT;
+ rlun->nr_free_blocks--;
+ }
}
return 0;
@@ -1199,6 +1248,51 @@ static void rrpc_luns_free(struct rrpc *rrpc)
kfree(rrpc->luns);
}
+static int rrpc_bb_discovery(struct nvm_tgt_dev *dev, struct rrpc_lun *rlun)
+{
+ struct nvm_geo *geo = &dev->geo;
+ struct rrpc_block *rblk;
+ struct ppa_addr ppa;
+ u8 *blks;
+ int nr_blks;
+ int i;
+ int ret;
+
+ nr_blks = geo->blks_per_lun * geo->plane_mode;
+ blks = kmalloc(nr_blks, GFP_KERNEL);
+ if (!blks)
+ return -ENOMEM;
+
+ ppa.ppa = 0;
+ ppa.g.ch = rlun->parent->chnl_id;
+ ppa.g.lun = rlun->parent->lun_id;
+
+ ret = nvm_get_bb_tbl(dev->parent, ppa, blks);
+ if (ret) {
+ pr_err("rrpc: could not get BB table\n");
+ goto out;
+ }
+
+ nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
+ if (nr_blks < 0)
+ return nr_blks;
+
+ rlun->nr_free_blocks = geo->blks_per_lun;
+ for (i = 0; i < nr_blks; i++) {
+ if (blks[i] == NVM_BLK_T_FREE)
+ continue;
+
+ rblk = &rlun->blocks[i];
+ list_move_tail(&rblk->list, &rlun->bb_list);
+ rblk->state = NVM_BLK_ST_BAD;
+ rlun->nr_free_blocks--;
+ }
+
+out:
+ kfree(blks);
+ return ret;
+}
+
static int rrpc_luns_init(struct rrpc *rrpc, struct list_head *lun_list)
{
struct nvm_tgt_dev *dev = rrpc->dev;
@@ -1232,16 +1326,26 @@ static int rrpc_luns_init(struct rrpc *rrpc, struct list_head *lun_list)
goto err;
}
+ INIT_LIST_HEAD(&rlun->free_list);
+ INIT_LIST_HEAD(&rlun->used_list);
+ INIT_LIST_HEAD(&rlun->bb_list);
+
for (j = 0; j < geo->blks_per_lun; j++) {
struct rrpc_block *rblk = &rlun->blocks[j];
- struct nvm_block *blk = &lun->blocks[j];
- rblk->parent = blk;
+ rblk->id = j;
rblk->rlun = rlun;
+ rblk->state = NVM_BLK_T_FREE;
INIT_LIST_HEAD(&rblk->prio);
+ INIT_LIST_HEAD(&rblk->list);
spin_lock_init(&rblk->lock);
+
+ list_add_tail(&rblk->list, &rlun->free_list);
}
+ if (rrpc_bb_discovery(dev, rlun))
+ goto err;
+
rlun->reserved_blocks = 2; /* for GC only */
rlun->rrpc = rrpc;
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