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Message-ID: <56EFCC2B.5070809@lightnvm.io>
Date: Mon, 21 Mar 2016 11:25:47 +0100
From: Matias Bjørling <mb@...htnvm.io>
To: Wenwei Tao <ww.tao0320@...il.com>, jg@...htnvm.io
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH v2] lightnvm: divide global reverse translation map into
per lun
On 03/20/2016 06:51 AM, Wenwei Tao wrote:
> 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@...il.com>
> ---
>
> Changes since v1
> -fix merge/rebase mistake in rrpc_block_map_update().
> -remove variables poffset and lun_offset in rrpc structure
> since no one use them now.
>
> drivers/lightnvm/rrpc.c | 181 +++++++++++++++++++++++++++--------------------
> drivers/lightnvm/rrpc.h | 9 ++-
> include/linux/lightnvm.h | 1 +
> 3 files changed, 111 insertions(+), 80 deletions(-)
>
> diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
> index 3ab6495..88e2ce5 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);
> + poffset = lun_poffset(rlun->parent, dev);
> for (offset = 0; offset < dev->sec_per_blk; offset++) {
> - paddr = bpaddr + 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..590f1b7 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;
> };
>
> @@ -98,8 +102,6 @@ struct rrpc {
> struct gendisk *disk;
>
> sector_t soffset; /* logical sector offset */
> - u64 poffset; /* physical page offset */
> - int lun_offset;
>
> int nr_luns;
> struct rrpc_lun *luns;
> @@ -124,9 +126,6 @@ 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 {
>
It seems like there is a race-condition when GC hits. It panics on
page_invalidation. You can test with the following fio script:
[global]
bs=4k
ioengine=libaio
iodepth=1
size=1G
direct=1
rw=randwrite
time_based
runtime=300
[p1]
numjobs=1
filename=/dev/test2
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