[PATCH 1/3] lightnvm: divide global reverse translation map into per lun

From: Wenwei Tao
Date: Sat Mar 19 2016 - 13:00:33 EST

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Divide the target's global reverse translation map into per lun,
to prepare support for the non-continuous lun target creation.

Signed-off-by: Wenwei Tao <ww.tao0320@xxxxxxxxx>
---
drivers/lightnvm/rrpc.c | 183 +++++++++++++++++++++++++++--------------------
drivers/lightnvm/rrpc.h | 7 +-
include/linux/lightnvm.h | 1 +
3 files changed, 112 insertions(+), 79 deletions(-)

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 3ab6495..4cc157a 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -23,28 +23,35 @@ static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
struct nvm_rq *rqd, unsigned long flags);

#define rrpc_for_each_lun(rrpc, rlun, i) \
- for ((i) = 0, rlun = &(rrpc)->luns[0]; \
- (i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)])
+ for ((i) = 0, rlun = &(rrpc)->luns[0]; \
+ (i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)])
+
+static inline u64 lun_poffset(struct nvm_lun *lun, struct nvm_dev *dev)
+{
+ return lun->id * dev->sec_per_lun;
+}

static void rrpc_page_invalidate(struct rrpc *rrpc, struct rrpc_addr *a)
{
struct rrpc_block *rblk = a->rblk;
- unsigned int pg_offset;
+ struct rrpc_lun *rlun = rblk->rlun;
+ u64 pg_offset;

- lockdep_assert_held(&rrpc->rev_lock);
+ lockdep_assert_held(&rlun->rev_lock);

if (a->addr == ADDR_EMPTY || !rblk)
return;

spin_lock(&rblk->lock);

- div_u64_rem(a->addr, rrpc->dev->sec_per_blk, &pg_offset);
+ div_u64_rem(a->addr, rrpc->dev->sec_per_blk, (u32 *)&pg_offset);
WARN_ON(test_and_set_bit(pg_offset, rblk->invalid_pages));
rblk->nr_invalid_pages++;

spin_unlock(&rblk->lock);

- rrpc->rev_trans_map[a->addr - rrpc->poffset].addr = ADDR_EMPTY;
+ pg_offset = lun_poffset(rlun->parent, rrpc->dev);
+ rlun->rev_trans_map[a->addr - pg_offset].addr = ADDR_EMPTY;
}

static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba,
@@ -52,14 +59,15 @@ static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba,
{
sector_t i;

- spin_lock(&rrpc->rev_lock);
for (i = slba; i < slba + len; i++) {
struct rrpc_addr *gp = &rrpc->trans_map[i];
+ struct rrpc_lun *rlun = gp->rblk->rlun;

+ spin_lock(&rlun->rev_lock);
rrpc_page_invalidate(rrpc, gp);
+ spin_unlock(&rlun->rev_lock);
gp->rblk = NULL;
}
- spin_unlock(&rrpc->rev_lock);
}

static struct nvm_rq *rrpc_inflight_laddr_acquire(struct rrpc *rrpc,
@@ -116,15 +124,6 @@ static int block_is_full(struct rrpc *rrpc, struct rrpc_block *rblk)
return (rblk->next_page == rrpc->dev->sec_per_blk);
}

-/* Calculate relative addr for the given block, considering instantiated LUNs */
-static u64 block_to_rel_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
-{
- struct nvm_block *blk = rblk->parent;
- int lun_blk = blk->id % (rrpc->dev->blks_per_lun * rrpc->nr_luns);
-
- return lun_blk * rrpc->dev->sec_per_blk;
-}
-
/* Calculate global addr for the given block */
static u64 block_to_addr(struct rrpc *rrpc, struct rrpc_block *rblk)
{
@@ -291,13 +290,14 @@ static void rrpc_end_sync_bio(struct bio *bio)
static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
{
struct request_queue *q = rrpc->dev->q;
+ struct rrpc_lun *rlun = rblk->rlun;
struct rrpc_rev_addr *rev;
struct nvm_rq *rqd;
struct bio *bio;
struct page *page;
int slot;
int nr_sec_per_blk = rrpc->dev->sec_per_blk;
- u64 phys_addr;
+ u64 phys_addr, poffset;
DECLARE_COMPLETION_ONSTACK(wait);

if (bitmap_full(rblk->invalid_pages, nr_sec_per_blk))
@@ -315,6 +315,7 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
return -ENOMEM;
}

+ poffset = lun_poffset(rlun->parent, rrpc->dev);
while ((slot = find_first_zero_bit(rblk->invalid_pages,
nr_sec_per_blk)) < nr_sec_per_blk) {

@@ -322,23 +323,23 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
phys_addr = rblk->parent->id * nr_sec_per_blk + slot;

try:
- spin_lock(&rrpc->rev_lock);
+ spin_lock(&rlun->rev_lock);
/* Get logical address from physical to logical table */
- rev = &rrpc->rev_trans_map[phys_addr - rrpc->poffset];
+ rev = &rlun->rev_trans_map[phys_addr - poffset];
/* already updated by previous regular write */
if (rev->addr == ADDR_EMPTY) {
- spin_unlock(&rrpc->rev_lock);
+ spin_unlock(&rlun->rev_lock);
continue;
}

rqd = rrpc_inflight_laddr_acquire(rrpc, rev->addr, 1);
if (IS_ERR_OR_NULL(rqd)) {
- spin_unlock(&rrpc->rev_lock);
+ spin_unlock(&rlun->rev_lock);
schedule();
goto try;
}

- spin_unlock(&rrpc->rev_lock);
+ spin_unlock(&rlun->rev_lock);

/* Perform read to do GC */
bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr);
@@ -407,7 +408,7 @@ static void rrpc_block_gc(struct work_struct *work)
struct rrpc_block *rblk = gcb->rblk;
struct nvm_dev *dev = rrpc->dev;
struct nvm_lun *lun = rblk->parent->lun;
- struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
+ struct rrpc_lun *rlun = lun->private;

mempool_free(gcb, rrpc->gcb_pool);
pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id);
@@ -510,7 +511,7 @@ static void rrpc_gc_queue(struct work_struct *work)
struct rrpc_block *rblk = gcb->rblk;
struct nvm_lun *lun = rblk->parent->lun;
struct nvm_block *blk = rblk->parent;
- struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
+ struct rrpc_lun *rlun = lun->private;

spin_lock(&rlun->lock);
list_add_tail(&rblk->prio, &rlun->prio_list);
@@ -561,22 +562,25 @@ static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc)
static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr,
struct rrpc_block *rblk, u64 paddr)
{
+ struct rrpc_lun *rlun = rblk->rlun;
struct rrpc_addr *gp;
struct rrpc_rev_addr *rev;
+ u64 poffset = lun_poffset(rlun->parent, rrpc->dev);

BUG_ON(laddr >= rrpc->nr_sects);

gp = &rrpc->trans_map[laddr];
- spin_lock(&rrpc->rev_lock);
+ spin_lock(&rlun->rev_lock);
+
if (gp->rblk)
rrpc_page_invalidate(rrpc, gp);

gp->addr = paddr;
gp->rblk = rblk;

- rev = &rrpc->rev_trans_map[gp->addr - rrpc->poffset];
+ rev = &rlun->rev_trans_map[gp->addr - poffset];
rev->addr = laddr;
- spin_unlock(&rrpc->rev_lock);
+ spin_unlock(&rlun->rev_lock);

return gp;
}
@@ -990,7 +994,6 @@ static int rrpc_gc_init(struct rrpc *rrpc)

static void rrpc_map_free(struct rrpc *rrpc)
{
- vfree(rrpc->rev_trans_map);
vfree(rrpc->trans_map);
}

@@ -998,8 +1001,8 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
{
struct rrpc *rrpc = (struct rrpc *)private;
struct nvm_dev *dev = rrpc->dev;
- struct rrpc_addr *addr = rrpc->trans_map + slba;
- struct rrpc_rev_addr *raddr = rrpc->rev_trans_map;
+ struct rrpc_addr *addr;
+ struct rrpc_rev_addr *raddr;
u64 elba = slba + nlb;
u64 i;

@@ -1008,9 +1011,15 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
return -EINVAL;
}

+ slba -= rrpc->soffset >> (ilog2(dev->sec_size) - 9);
+ addr = rrpc->trans_map + slba;
for (i = 0; i < nlb; i++) {
+ struct rrpc_lun *rlun;
+ struct nvm_lun *lun;
u64 pba = le64_to_cpu(entries[i]);
- unsigned int mod;
+ u64 poffset;
+ int lunid;
+
/* LNVM treats address-spaces as silos, LBA and PBA are
* equally large and zero-indexed.
*/
@@ -1026,10 +1035,18 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
if (!pba)
continue;

- div_u64_rem(pba, rrpc->nr_sects, &mod);
+ lunid = div_u64(pba, dev->sec_per_lun);
+ lun = dev->mt->get_lun(dev, lunid);
+
+ if (unlikely(!lun))
+ return -EINVAL;
+
+ rlun = lun->private;
+ raddr = rlun->rev_trans_map;
+ poffset = lun_poffset(lun, dev);

addr[i].addr = pba;
- raddr[mod].addr = slba + i;
+ raddr[pba - poffset].addr = slba + i;
}

return 0;
@@ -1048,17 +1065,10 @@ static int rrpc_map_init(struct rrpc *rrpc)
if (!rrpc->trans_map)
return -ENOMEM;

- rrpc->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr)
- * rrpc->nr_sects);
- if (!rrpc->rev_trans_map)
- return -ENOMEM;
-
for (i = 0; i < rrpc->nr_sects; i++) {
struct rrpc_addr *p = &rrpc->trans_map[i];
- struct rrpc_rev_addr *r = &rrpc->rev_trans_map[i];

p->addr = ADDR_EMPTY;
- r->addr = ADDR_EMPTY;
}

if (!dev->ops->get_l2p_tbl)
@@ -1143,25 +1153,69 @@ static void rrpc_luns_free(struct rrpc *rrpc)
if (!lun)
break;
dev->mt->release_lun(dev, lun->id);
+ vfree(rlun->rev_trans_map);
vfree(rlun->blocks);
}

kfree(rrpc->luns);
+ rrpc->luns = NULL;
+}
+
+static int rrpc_lun_init(struct rrpc *rrpc, struct rrpc_lun *rlun,
+ struct nvm_lun *lun)
+{
+ struct nvm_dev *dev = rrpc->dev;
+ int i;
+
+ rlun->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr) *
+ dev->sec_per_lun);
+ if (!rlun->rev_trans_map)
+ return -ENOMEM;
+
+ for (i = 0; i < dev->sec_per_lun; i++) {
+ struct rrpc_rev_addr *r = &rlun->rev_trans_map[i];
+
+ r->addr = ADDR_EMPTY;
+ }
+ rlun->blocks = vzalloc(sizeof(struct rrpc_block) * dev->blks_per_lun);
+ if (!rlun->blocks) {
+ vfree(rlun->rev_trans_map);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < dev->blks_per_lun; i++) {
+ struct rrpc_block *rblk = &rlun->blocks[i];
+ struct nvm_block *blk = &lun->blocks[i];
+
+ rblk->parent = blk;
+ rblk->rlun = rlun;
+ INIT_LIST_HEAD(&rblk->prio);
+ spin_lock_init(&rblk->lock);
+ }
+
+ rlun->rrpc = rrpc;
+ lun->private = rlun;
+ INIT_LIST_HEAD(&rlun->prio_list);
+ INIT_LIST_HEAD(&rlun->open_list);
+ INIT_LIST_HEAD(&rlun->closed_list);
+ INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
+ spin_lock_init(&rlun->lock);
+ spin_lock_init(&rlun->rev_lock);
+
+ return 0;
}

static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
{
struct nvm_dev *dev = rrpc->dev;
struct rrpc_lun *rlun;
- int i, j, ret = -EINVAL;
+ int i, ret = -EINVAL;

if (dev->sec_per_blk > MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
pr_err("rrpc: number of pages per block too high.");
return -EINVAL;
}

- spin_lock_init(&rrpc->rev_lock);
-
rrpc->luns = kcalloc(rrpc->nr_luns, sizeof(struct rrpc_lun),
GFP_KERNEL);
if (!rrpc->luns)
@@ -1183,31 +1237,9 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)

rlun = &rrpc->luns[i];
rlun->parent = lun;
- rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
- rrpc->dev->blks_per_lun);
- if (!rlun->blocks) {
- ret = -ENOMEM;
+ ret = rrpc_lun_init(rrpc, rlun, lun);
+ if (ret)
goto err;
- }
-
- for (j = 0; j < rrpc->dev->blks_per_lun; j++) {
- struct rrpc_block *rblk = &rlun->blocks[j];
- struct nvm_block *blk = &lun->blocks[j];
-
- rblk->parent = blk;
- rblk->rlun = rlun;
- INIT_LIST_HEAD(&rblk->prio);
- spin_lock_init(&rblk->lock);
- }
-
- rlun->rrpc = rrpc;
- INIT_LIST_HEAD(&rlun->prio_list);
- INIT_LIST_HEAD(&rlun->open_list);
- INIT_LIST_HEAD(&rlun->closed_list);
-
- INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
- spin_lock_init(&rlun->lock);
-
rrpc->total_blocks += dev->blks_per_lun;
rrpc->nr_sects += dev->sec_per_lun;

@@ -1215,6 +1247,7 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)

return 0;
err:
+ rrpc_luns_free(rrpc);
return ret;
}

@@ -1288,15 +1321,16 @@ static sector_t rrpc_capacity(void *private)
static void rrpc_block_map_update(struct rrpc *rrpc, struct rrpc_block *rblk)
{
struct nvm_dev *dev = rrpc->dev;
+ struct rrpc_lun *rlun = rblk->rlun;
int offset;
struct rrpc_addr *laddr;
- u64 bpaddr, paddr, pladdr;
+ u64 paddr, pladdr, poffset;

- bpaddr = block_to_rel_addr(rrpc, rblk);
- for (offset = 0; offset < dev->sec_per_blk; offset++) {
- paddr = bpaddr + offset;
+ poffset = lun_poffset(rlun->parent, dev);
+ for (offset = 0; offset < dev->pgs_per_blk; offset++) {
+ paddr = block_to_addr(rrpc, rblk) + offset;

- pladdr = rrpc->rev_trans_map[paddr].addr;
+ pladdr = rlun->rev_trans_map[paddr - poffset].addr;
if (pladdr == ADDR_EMPTY)
continue;

@@ -1405,9 +1439,6 @@ static void *rrpc_init(struct nvm_dev *dev, struct gendisk *tdisk,
goto err;
}

- rrpc->poffset = dev->sec_per_lun * lun_begin;
- rrpc->lun_offset = lun_begin;
-
ret = rrpc_core_init(rrpc);
if (ret) {
pr_err("nvm: rrpc: could not initialize core\n");
diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h
index 2653484..032e987 100644
--- a/drivers/lightnvm/rrpc.h
+++ b/drivers/lightnvm/rrpc.h
@@ -87,6 +87,10 @@ struct rrpc_lun {

struct work_struct ws_gc;

+ /* store a reverse map for garbage collection */
+ struct rrpc_rev_addr *rev_trans_map;
+ spinlock_t rev_lock;
+
spinlock_t lock;
};

@@ -124,9 +128,6 @@ struct rrpc {
* addresses are used when writing to the disk block device.
*/
struct rrpc_addr *trans_map;
- /* also store a reverse map for garbage collection */
- struct rrpc_rev_addr *rev_trans_map;
- spinlock_t rev_lock;

struct rrpc_inflight inflights;

diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index cdcb2cc..419a3db 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -276,6 +276,7 @@ struct nvm_lun {
spinlock_t lock;

struct nvm_block *blocks;
+ void *private;
};

enum {
--
1.9.1

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Next in thread: Wenwei Tao: "[PATCH v5 2/3] lightnvm: add non-continuous lun target creation support"
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