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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>
hifive-unleashed-5.1
Matias Bjørling 2018-01-05 14:16:02 +01:00 committed by Jens Axboe
parent 98281a90ac
commit bb27aa9ecd
3 changed files with 0 additions and 87 deletions
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67
drivers/lightnvm/core.c
View File

@ -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);
}

14
drivers/nvme/host/lightnvm.c
View File

@ -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;
}

6
include/linux/lightnvm.h
View File

@ -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;