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Subject[PATCH 18/23] lightnvm: eliminate nvm_block abstraction on mm
Date
From: Javier González <jg@lightnvm.io>

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>
---
drivers/lightnvm/core.c | 10 +-
drivers/lightnvm/gennvm.c | 205 +---------------------------------------
drivers/lightnvm/rrpc.c | 234 +++++++++++++++++++++++++++++++++-------------
drivers/lightnvm/rrpc.h | 23 +++--
include/linux/lightnvm.h | 48 +---------
5 files changed, 191 insertions(+), 329 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 493ce03..691b16f 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -176,12 +176,6 @@ static struct nvm_dev *nvm_find_nvm_dev(const char *name)
return NULL;
}

-void nvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
-{
- return dev->mt->mark_blk(dev, ppa, type);
-}
-EXPORT_SYMBOL(nvm_mark_blk);
-
int nvm_set_bb_tbl(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas,
int type)
{
@@ -215,9 +209,9 @@ int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
}
EXPORT_SYMBOL(nvm_submit_io);

-int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, int flags)
+int nvm_erase_blk(struct nvm_dev *dev, struct ppa_addr *p, int flags)
{
- return dev->mt->erase_blk(dev, blk, flags);
+ return dev->mt->erase_blk(dev, p, flags);
}
EXPORT_SYMBOL(nvm_erase_blk);

diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index dd9afd7..19c3924 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -306,19 +306,6 @@ static void gen_put_area(struct nvm_dev *dev, sector_t begin)
spin_unlock(&dev->lock);
}

-static void gen_blocks_free(struct nvm_dev *dev)
-{
- struct gen_dev *gn = dev->mp;
- struct nvm_lun *lun;
- int i;
-
- gen_for_each_lun(gn, lun, i) {
- if (!lun->blocks)
- break;
- vfree(lun->blocks);
- }
-}
-
static void gen_luns_free(struct nvm_dev *dev)
{
struct gen_dev *gn = dev->mp;
@@ -337,167 +324,17 @@ static int gen_luns_init(struct nvm_dev *dev, struct gen_dev *gn)
return -ENOMEM;

gen_for_each_lun(gn, lun, i) {
- INIT_LIST_HEAD(&lun->free_list);
- INIT_LIST_HEAD(&lun->used_list);
- INIT_LIST_HEAD(&lun->bb_list);
INIT_LIST_HEAD(&lun->list);

- spin_lock_init(&lun->lock);
-
lun->id = i;
lun->lun_id = i % geo->luns_per_chnl;
lun->chnl_id = i / geo->luns_per_chnl;
- lun->nr_free_blocks = geo->blks_per_lun;
}
return 0;
}

-static int gen_block_bb(struct gen_dev *gn, struct ppa_addr ppa,
- u8 *blks, int nr_blks)
-{
- struct nvm_dev *dev = gn->dev;
- struct nvm_lun *lun;
- struct nvm_block *blk;
- int i;
-
- nr_blks = nvm_bb_tbl_fold(dev, blks, nr_blks);
- if (nr_blks < 0)
- return nr_blks;
-
- lun = &gn->luns[(dev->geo.luns_per_chnl * ppa.g.ch) + ppa.g.lun];
-
- for (i = 0; i < nr_blks; i++) {
- if (blks[i] == NVM_BLK_T_FREE)
- continue;
-
- blk = &lun->blocks[i];
- list_move_tail(&blk->list, &lun->bb_list);
- blk->state = NVM_BLK_ST_BAD;
- lun->nr_free_blocks--;
- }
-
- return 0;
-}
-
-static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
-{
- struct nvm_dev *dev = private;
- struct nvm_geo *geo = &dev->geo;
- struct gen_dev *gn = dev->mp;
- u64 elba = slba + nlb;
- struct nvm_lun *lun;
- struct nvm_block *blk;
- u64 i;
- int lun_id;
-
- if (unlikely(elba > dev->total_secs)) {
- pr_err("gen: L2P data from device is out of bounds!\n");
- return -EINVAL;
- }
-
- for (i = 0; i < nlb; i++) {
- u64 pba = le64_to_cpu(entries[i]);
-
- if (unlikely(pba >= dev->total_secs && pba != U64_MAX)) {
- pr_err("gen: L2P data entry is out of bounds!\n");
- return -EINVAL;
- }
-
- /* Address zero is a special one. The first page on a disk is
- * protected. It often holds internal device boot
- * information.
- */
- if (!pba)
- continue;
-
- /* resolve block from physical address */
- lun_id = div_u64(pba, geo->sec_per_lun);
- lun = &gn->luns[lun_id];
-
- /* Calculate block offset into lun */
- pba = pba - (geo->sec_per_lun * lun_id);
- blk = &lun->blocks[div_u64(pba, geo->sec_per_blk)];
-
- if (!blk->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(&blk->list, &lun->used_list);
- blk->state = NVM_BLK_ST_TGT;
- lun->nr_free_blocks--;
- }
- }
-
- return 0;
-}
-
-static int gen_blocks_init(struct nvm_dev *dev, struct gen_dev *gn)
-{
- struct nvm_geo *geo = &dev->geo;
- struct nvm_lun *lun;
- struct nvm_block *block;
- sector_t lun_iter, blk_iter, cur_block_id = 0;
- int ret, nr_blks;
- u8 *blks;
-
- nr_blks = geo->blks_per_lun * geo->plane_mode;
- blks = kmalloc(nr_blks, GFP_KERNEL);
- if (!blks)
- return -ENOMEM;
-
- gen_for_each_lun(gn, lun, lun_iter) {
- lun->blocks = vzalloc(sizeof(struct nvm_block) *
- geo->blks_per_lun);
- if (!lun->blocks) {
- kfree(blks);
- return -ENOMEM;
- }
-
- for (blk_iter = 0; blk_iter < geo->blks_per_lun; blk_iter++) {
- block = &lun->blocks[blk_iter];
-
- INIT_LIST_HEAD(&block->list);
-
- block->lun = lun;
- block->id = cur_block_id++;
-
- list_add_tail(&block->list, &lun->free_list);
- }
-
- if (dev->ops->get_bb_tbl) {
- struct ppa_addr ppa;
-
- ppa.ppa = 0;
- ppa.g.ch = lun->chnl_id;
- ppa.g.lun = lun->lun_id;
-
- ret = nvm_get_bb_tbl(dev, ppa, blks);
- if (ret)
- pr_err("gen: could not get BB table\n");
-
- ret = gen_block_bb(gn, ppa, blks, nr_blks);
- if (ret)
- 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,
- gen_block_map, dev);
- if (ret) {
- pr_err("gen: could not read L2P table.\n");
- pr_warn("gen: default block initialization");
- }
- }
-
- kfree(blks);
- return 0;
-}
-
static void gen_free(struct nvm_dev *dev)
{
- gen_blocks_free(dev);
gen_luns_free(dev);
kfree(dev->mp);
dev->mp = NULL;
@@ -528,12 +365,6 @@ static int gen_register(struct nvm_dev *dev)
goto err;
}

- ret = gen_blocks_init(dev, gn);
- if (ret) {
- pr_err("gen: could not initialize blocks\n");
- goto err;
- }
-
return 1;
err:
gen_free(dev);
@@ -558,34 +389,6 @@ static void gen_unregister(struct nvm_dev *dev)
module_put(THIS_MODULE);
}

-static void gen_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)
-{
- struct nvm_geo *geo = &dev->geo;
- struct gen_dev *gn = dev->mp;
- struct nvm_lun *lun;
- struct nvm_block *blk;
-
- 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 > geo->nr_chnls ||
- ppa.g.lun > geo->luns_per_chnl ||
- ppa.g.blk > geo->blks_per_lun)) {
- WARN_ON_ONCE(1);
- pr_err("gen: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u",
- ppa.g.ch, geo->nr_chnls,
- ppa.g.lun, geo->luns_per_chnl,
- ppa.g.blk, geo->blks_per_lun);
- return;
- }
-
- lun = &gn->luns[(geo->luns_per_chnl * ppa.g.ch) + ppa.g.lun];
- blk = &lun->blocks[ppa.g.blk];
-
- /* will be moved to bb list on put_blk from target */
- blk->state = type;
-}
-
static void gen_end_io(struct nvm_rq *rqd)
{
struct nvm_tgt_instance *ins = rqd->ins;
@@ -606,11 +409,9 @@ static int gen_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
return dev->ops->submit_io(dev, rqd);
}

-static int gen_erase_blk(struct nvm_dev *dev, struct nvm_block *blk, int flags)
+static int gen_erase_blk(struct nvm_dev *dev, struct ppa_addr *p, int flags)
{
- struct ppa_addr addr = block_to_ppa(dev, blk);
-
- return nvm_erase_ppa(dev, &addr, 1, flags);
+ return nvm_erase_ppa(dev, p, 1, flags);
}

static struct nvmm_type gen = {
@@ -626,8 +427,6 @@ static struct nvmm_type gen = {
.submit_io = gen_submit_io,
.erase_blk = gen_erase_blk,

- .mark_blk = gen_mark_blk,
-
.get_area = gen_get_area,
.put_area = gen_put_area,

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 @@ static void rrpc_block_gc(struct work_struct *work)
/* 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 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)
{
- struct nvm_tgt_dev *dev = rrpc->dev;
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;
diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h
index 242d4c1..c55cec9 100644
--- a/drivers/lightnvm/rrpc.h
+++ b/drivers/lightnvm/rrpc.h
@@ -52,8 +52,7 @@ struct rrpc_rq {
};

struct rrpc_block {
- unsigned long id;
- struct nvm_block *parent;
+ int id; /* id inside of LUN */
struct rrpc_lun *rlun;

struct list_head prio; /* LUN CG list */
@@ -83,6 +82,16 @@ struct rrpc_lun {
struct list_head prio_list; /* Blocks that may be GC'ed */
struct list_head wblk_list; /* Queued blocks to be written to */

+ /* lun block lists */
+ struct list_head used_list; /* In-use blocks */
+ struct list_head free_list; /* Not used blocks i.e. released
+ * and ready for use
+ */
+ struct list_head bb_list; /* Bad blocks. Mutually exclusive with
+ * free_list and used_list
+ */
+ unsigned int nr_free_blocks; /* Number of unused blocks */
+
struct work_struct ws_gc;

int reserved_blocks;
@@ -155,14 +164,14 @@ struct rrpc_rev_addr {
u64 addr;
};

-static inline struct rrpc_block *rrpc_get_rblk(struct rrpc_lun *rlun,
- int blk_id)
+static inline u64 rrpc_blk_to_ppa(struct rrpc *rrpc, struct rrpc_block *rblk)
{
- struct rrpc *rrpc = rlun->rrpc;
struct nvm_tgt_dev *dev = rrpc->dev;
- int lun_blk = blk_id % dev->geo.blks_per_lun;
+ struct nvm_geo *geo = &dev->geo;
+ struct rrpc_lun *rlun = rblk->rlun;
+ struct nvm_lun *lun = rlun->parent;

- return &rlun->blocks[lun_blk];
+ return (lun->id * geo->sec_per_lun) + (rblk->id * geo->sec_per_blk);
}

static inline sector_t rrpc_get_laddr(struct bio *bio)
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index ed04fa6..cc210cc 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -266,8 +266,6 @@ static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
return rqdata + 1;
}

-struct nvm_block;
-
struct nvm_lun {
int id;

@@ -275,19 +273,6 @@ struct nvm_lun {
int chnl_id;

struct list_head list;
- spinlock_t lock;
-
- /* lun block lists */
- struct list_head used_list; /* In-use blocks */
- struct list_head free_list; /* Not used blocks i.e. released
- * and ready for use
- */
- struct list_head bb_list; /* Bad blocks. Mutually exclusive with
- * free_list and used_list
- */
- unsigned int nr_free_blocks; /* Number of unused blocks */
-
- struct nvm_block *blocks;
};

enum {
@@ -296,15 +281,6 @@ enum {
NVM_BLK_ST_BAD = 0x8, /* Bad block */
};

-struct nvm_block {
- struct list_head list;
- struct nvm_lun *lun;
- unsigned long id;
-
- void *priv;
- int state;
-};
-
/* system block cpu representation */
struct nvm_sb_info {
unsigned long seqnr;
@@ -473,21 +449,6 @@ static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
ppa_addr->ppa = ADDR_EMPTY;
}

-static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev,
- struct nvm_block *blk)
-{
- struct nvm_geo *geo = &dev->geo;
- struct ppa_addr ppa;
- struct nvm_lun *lun = blk->lun;
-
- ppa.ppa = 0;
- ppa.g.blk = blk->id % geo->blks_per_lun;
- ppa.g.lun = lun->lun_id;
- ppa.g.ch = lun->chnl_id;
-
- return ppa;
-}
-
static inline int ppa_cmp_blk(struct ppa_addr ppa1, struct ppa_addr ppa2)
{
if (ppa_empty(ppa1) || ppa_empty(ppa2))
@@ -539,8 +500,7 @@ typedef void (nvmm_unregister_fn)(struct nvm_dev *);
typedef int (nvmm_create_tgt_fn)(struct nvm_dev *, struct nvm_ioctl_create *);
typedef int (nvmm_remove_tgt_fn)(struct nvm_dev *, struct nvm_ioctl_remove *);
typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
-typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *, int);
-typedef void (nvmm_mark_blk_fn)(struct nvm_dev *, struct ppa_addr, int);
+typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct ppa_addr *, int);
typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
typedef void (nvmm_put_area_fn)(struct nvm_dev *, sector_t);

@@ -557,9 +517,6 @@ struct nvmm_type {
nvmm_submit_io_fn *submit_io;
nvmm_erase_blk_fn *erase_blk;

- /* Bad block mgmt */
- nvmm_mark_blk_fn *mark_blk;
-
nvmm_get_area_fn *get_area;
nvmm_put_area_fn *put_area;

@@ -573,7 +530,6 @@ extern struct nvm_dev *nvm_alloc_dev(int);
extern int nvm_register(struct nvm_dev *);
extern void nvm_unregister(struct nvm_dev *);

-extern void nvm_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type);
extern int nvm_set_bb_tbl(struct nvm_dev *dev, struct ppa_addr *ppas,
int nr_ppas, int type);

@@ -584,7 +540,7 @@ extern int nvm_set_rqd_ppalist(struct nvm_dev *, struct nvm_rq *,
const struct ppa_addr *, int, int);
extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
extern int nvm_erase_ppa(struct nvm_dev *, struct ppa_addr *, int, int);
-extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *, int);
+extern int nvm_erase_blk(struct nvm_dev *, struct ppa_addr *, int);
extern void nvm_end_io(struct nvm_rq *, int);
extern int nvm_submit_ppa(struct nvm_dev *, struct ppa_addr *, int, int, int,
void *, int);
--
2.9.3
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  Last update: 2016-11-28 22:41    [W:0.181 / U:0.144 seconds]
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