lightnvm: remove lower page tables

The lower page table is unused. All page tables reported by 1.2
devices are all reporting a sequential 1:1 page mapping. This is
also not used going forward with the 2.0 revision.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

3 files changed, 0 insertions, 87 deletions

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 390d5efd6287..52059dd0ed18 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -751,53 +751,6 @@ int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
 }
 EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
 
-static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
-{
-        struct nvm_geo *geo = &dev->geo;
-        int i;
-
-        dev->lps_per_blk = geo->pgs_per_blk;
-        dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
-        if (!dev->lptbl)
-                return -ENOMEM;
-
-        /* Just a linear array */
-        for (i = 0; i < dev->lps_per_blk; i++)
-                dev->lptbl[i] = i;
-
-        return 0;
-}
-
-static int nvm_init_mlc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
-{
-        int i, p;
-        struct nvm_id_lp_mlc *mlc = &grp->lptbl.mlc;
-
-        if (!mlc->num_pairs)
-                return 0;
-
-        dev->lps_per_blk = mlc->num_pairs;
-        dev->lptbl = kcalloc(dev->lps_per_blk, sizeof(int), GFP_KERNEL);
-        if (!dev->lptbl)
-                return -ENOMEM;
-
-        /* The lower page table encoding consists of a list of bytes, where each
-         * has a lower and an upper half. The first half byte maintains the
-         * increment value and every value after is an offset added to the
-         * previous incrementation value
-         */
-        dev->lptbl[0] = mlc->pairs[0] & 0xF;
-        for (i = 1; i < dev->lps_per_blk; i++) {
-                p = mlc->pairs[i >> 1];
-                if (i & 0x1) /* upper */
-                        dev->lptbl[i] = dev->lptbl[i - 1] + ((p & 0xF0) >> 4);
-                else /* lower */
-                        dev->lptbl[i] = dev->lptbl[i - 1] + (p & 0xF);
-        }
-
-        return 0;
-}
-
 static int nvm_core_init(struct nvm_dev *dev)
 {
         struct nvm_id *id = &dev->identity;
@@ -846,25 +799,6 @@ static int nvm_core_init(struct nvm_dev *dev)
         if (!dev->lun_map)
                 return -ENOMEM;
 
-        switch (grp->fmtype) {
-        case NVM_ID_FMTYPE_SLC:
-                if (nvm_init_slc_tbl(dev, grp)) {
-                        ret = -ENOMEM;
-                        goto err_fmtype;
-                }
-                break;
-        case NVM_ID_FMTYPE_MLC:
-                if (nvm_init_mlc_tbl(dev, grp)) {
-                        ret = -ENOMEM;
-                        goto err_fmtype;
-                }
-                break;
-        default:
-                pr_err("nvm: flash type not supported\n");
-                ret = -EINVAL;
-                goto err_fmtype;
-        }
-
         INIT_LIST_HEAD(&dev->area_list);
         INIT_LIST_HEAD(&dev->targets);
         mutex_init(&dev->mlock);
@@ -890,7 +824,6 @@ static void nvm_free(struct nvm_dev *dev)
                 dev->ops->destroy_dma_pool(dev->dma_pool);
 
         nvm_unregister_map(dev);
-        kfree(dev->lptbl);
         kfree(dev->lun_map);
         kfree(dev);
 }
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 26f7eccc1684..15bf243f6096 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -246,20 +246,6 @@ static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id)
 
         dst->cpar = le16_to_cpu(src->cpar);
 
-        if (dst->fmtype == NVM_ID_FMTYPE_MLC) {
-                memcpy(dst->lptbl.id, src->lptbl.id, 8);
-                dst->lptbl.mlc.num_pairs =
-                                le16_to_cpu(src->lptbl.mlc.num_pairs);
-
-                if (dst->lptbl.mlc.num_pairs > NVME_NVM_LP_MLC_PAIRS) {
-                        pr_err("nvm: number of MLC pairs not supported\n");
-                        return -EINVAL;
-                }
-
-                memcpy(dst->lptbl.mlc.pairs, src->lptbl.mlc.pairs,
-                                        dst->lptbl.mlc.num_pairs);
-        }
-
         return 0;
 }
 
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 07cdb05a9a87..a5d8e0cbbb46 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -174,8 +174,6 @@ struct nvm_id_group {
         u32     mpos;
         u32     mccap;
         u16     cpar;
-
-        struct nvm_id_lp_tbl lptbl;
 };
 
 struct nvm_addr_format {
@@ -313,10 +311,6 @@ struct nvm_dev {
         /* Device information */
         struct nvm_geo geo;
 
-          /* lower page table */
-        int lps_per_blk;
-        int *lptbl;
-
         unsigned long total_secs;
 
         unsigned long *lun_map;