lightnvm: introduce helpers for generic ops in rrpc

Avoid calling media manager and device-specific operations directly from
rrpc. Create helper functions on lightnvm's core instead.

Signed-off-by: Javier González <javier@cnexlabs.com>
Made it work with null_blk as well.
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 23d582f..69f261e 100644 (file)
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -219,6 +219,28 @@ int nvm_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p, int flags)
 }
 EXPORT_SYMBOL(nvm_erase_blk);
 
+int nvm_get_l2p_tbl(struct nvm_dev *dev, u64 slba, u32 nlb,
+                   nvm_l2p_update_fn *update_l2p, void *priv)
+{
+       if (!dev->ops->get_l2p_tbl)
+               return 0;
+
+       return dev->ops->get_l2p_tbl(dev, slba, nlb, update_l2p, priv);
+}
+EXPORT_SYMBOL(nvm_get_l2p_tbl);
+
+int nvm_get_area(struct nvm_dev *dev, sector_t *lba, sector_t len)
+{
+       return dev->mt->get_area(dev, lba, len);
+}
+EXPORT_SYMBOL(nvm_get_area);
+
+void nvm_put_area(struct nvm_dev *dev, sector_t lba)
+{
+       dev->mt->put_area(dev, lba);
+}
+EXPORT_SYMBOL(nvm_put_area);
+
 void nvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
 {
        int i;

diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 5d7c8c4..befa828 100644 (file)
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -175,8 +175,6 @@ static struct nvm_tgt_dev *gen_create_tgt_dev(struct nvm_dev *dev,
        tgt_dev->geo.luns_per_chnl = (lun_balanced) ? prev_nr_luns : -1;
        tgt_dev->total_secs = nr_luns * tgt_dev->geo.sec_per_lun;
        tgt_dev->q = dev->q;
-       tgt_dev->ops = dev->ops;
-       tgt_dev->mt = dev->mt;
        tgt_dev->map = dev_map;
        tgt_dev->luns = luns;
        memcpy(&tgt_dev->identity, &dev->identity, sizeof(struct nvm_id));

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 75ed12a..e4678b7 100644 (file)
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -1166,11 +1166,8 @@ static int rrpc_map_init(struct rrpc *rrpc)
                r->addr = ADDR_EMPTY;
        }
 
-       if (!dev->ops->get_l2p_tbl)
-               return 0;
-
        /* Bring up the mapping table from device */
-       ret = dev->ops->get_l2p_tbl(dev->parent, rrpc->soffset, rrpc->nr_sects,
+       ret = nvm_get_l2p_tbl(dev->parent, rrpc->soffset, rrpc->nr_sects,
                                        rrpc_l2p_update, rrpc);
        if (ret) {
                pr_err("nvm: rrpc: could not read L2P table.\n");
@@ -1258,6 +1255,9 @@ static int rrpc_bb_discovery(struct nvm_tgt_dev *dev, struct rrpc_lun *rlun)
        int i;
        int ret;
 
+       if (!dev->parent->ops->get_bb_tbl)
+               return 0;
+
        nr_blks = geo->blks_per_lun * geo->plane_mode;
        blks = kmalloc(nr_blks, GFP_KERNEL);
        if (!blks)
@@ -1277,7 +1277,6 @@ static int rrpc_bb_discovery(struct nvm_tgt_dev *dev, struct rrpc_lun *rlun)
        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;
@@ -1348,17 +1347,19 @@ static int rrpc_luns_init(struct rrpc *rrpc, struct ppa_addr *luns)
                        list_add_tail(&rblk->list, &rlun->free_list);
                }
 
-               if (rrpc_bb_discovery(dev, rlun))
-                       goto err;
-
+               rlun->rrpc = rrpc;
+               rlun->nr_free_blocks = geo->blks_per_lun;
                rlun->reserved_blocks = 2; /* for GC only */
 
-               rlun->rrpc = rrpc;
                INIT_LIST_HEAD(&rlun->prio_list);
                INIT_LIST_HEAD(&rlun->wblk_list);
 
                INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
                spin_lock_init(&rlun->lock);
+
+               if (rrpc_bb_discovery(dev, rlun))
+                       goto err;
+
        }
 
        return 0;
@@ -1370,13 +1371,12 @@ err:
 static int rrpc_area_init(struct rrpc *rrpc, sector_t *begin)
 {
        struct nvm_tgt_dev *dev = rrpc->dev;
-       struct nvmm_type *mt = dev->mt;
        sector_t size = rrpc->nr_sects * dev->geo.sec_size;
        int ret;
 
        size >>= 9;
 
-       ret = mt->get_area(dev->parent, begin, size);
+       ret = nvm_get_area(dev->parent, begin, size);
        if (!ret)
                *begin >>= (ilog2(dev->geo.sec_size) - 9);
 
@@ -1386,10 +1386,9 @@ static int rrpc_area_init(struct rrpc *rrpc, sector_t *begin)
 static void rrpc_area_free(struct rrpc *rrpc)
 {
        struct nvm_tgt_dev *dev = rrpc->dev;
-       struct nvmm_type *mt = dev->mt;
        sector_t begin = rrpc->soffset << (ilog2(dev->geo.sec_size) - 9);
 
-       mt->put_area(dev->parent, begin);
+       nvm_put_area(dev->parent, begin);
 }
 
 static void rrpc_free(struct rrpc *rrpc)

diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 2222853..99cd1e7 100644 (file)
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -320,10 +320,7 @@ struct nvm_tgt_dev {
        struct nvm_id identity;
        struct request_queue *q;
 
-       struct nvmm_type *mt;
-       struct nvm_dev_ops *ops;
-
-       void *parent;
+       struct nvm_dev *parent;
        void *map;
 };