diff options
| author | Matias Bjørling <m@bjorling.me> | 2016-01-12 07:49:35 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-01-12 08:21:17 -0700 |
| commit | ca5927e7ab5307965104ca58bbb29d110b1d4545 (patch) | |
| tree | f64096e4c7fc250829fee2020089bf9835cd1d43 /drivers/nvme | |
| parent | f9a9995072904f2d67d649545f17f81e00f4985e (diff) | |
lightnvm: introduce mlc lower page table mappings
NAND MLC memories have both lower and upper pages. When programming,
both of these must be written, before data can be read. However,
these lower and upper pages might not placed at even and odd flash
pages, but can be skipped. Therefore each flash memory has its lower
pages defined, which can then be used when programming and to know when
padding are necessary.
This patch implements the lower page definition in the specification,
and exposes it through a simple lookup table at dev->lptbl.
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/lightnvm.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c index b112f022dee2..215c02512811 100644 --- a/drivers/nvme/host/lightnvm.c +++ b/drivers/nvme/host/lightnvm.c @@ -146,6 +146,16 @@ struct nvme_nvm_command { }; }; +struct nvme_nvm_lp_mlc { + __u16 num_pairs; + __u8 pairs[886]; +}; + +struct nvme_nvm_lp_tbl { + __u8 id[8]; + struct nvme_nvm_lp_mlc mlc; +}; + struct nvme_nvm_id_group { __u8 mtype; __u8 fmtype; @@ -169,7 +179,8 @@ struct nvme_nvm_id_group { __le32 mpos; __le32 mccap; __le16 cpar; - __u8 reserved[906]; + __u8 reserved[10]; + struct nvme_nvm_lp_tbl lptbl; } __packed; struct nvme_nvm_addr_format { @@ -266,6 +277,15 @@ static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id) dst->mccap = le32_to_cpu(src->mccap); 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); + /* 4 bits per pair */ + memcpy(dst->lptbl.mlc.pairs, src->lptbl.mlc.pairs, + dst->lptbl.mlc.num_pairs >> 1); + } } return 0; |