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nvme: lightnvm: return ppa completion status 

PPAs sent to device is separately acknowledge in a 64bit status
variable. The status is stored in DW0 and DW1 of the completion queue
entry. Store this status inside the nvm_rq for further processing.

This can later be used to implement retry techniques for failed writes
and reads.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjorling 2016-03-03 15:06:39 +01:00 committed by Jens Axboe
parent da1e284919
commit 9f86726843
2 changed files with 16 additions and 2 deletions
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17
drivers/nvme/host/lightnvm.c
View File

@ -146,6 +146,14 @@ struct nvme_nvm_command {
};
};
struct nvme_nvm_completion {
__le64 result; /* Used by LightNVM to return ppa completions */
__le16 sq_head; /* how much of this queue may be reclaimed */
__le16 sq_id; /* submission queue that generated this entry */
__u16 command_id; /* of the command which completed */
__le16 status; /* did the command fail, and if so, why? */
};
#define NVME_NVM_LP_MLC_PAIRS 886
struct nvme_nvm_lp_mlc {
__u16 num_pairs;
@ -507,6 +515,10 @@ static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
static void nvme_nvm_end_io(struct request *rq, int error)
{
struct nvm_rq *rqd = rq->end_io_data;
struct nvme_nvm_completion *cqe = rq->special;
if (cqe)
rqd->ppa_status = le64_to_cpu(cqe->result);
nvm_end_io(rqd, error);
@ -526,7 +538,8 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
if (IS_ERR(rq))
return -ENOMEM;
cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
cmd = kzalloc(sizeof(struct nvme_nvm_command) +
sizeof(struct nvme_nvm_completion), GFP_KERNEL);
if (!cmd) {
blk_mq_free_request(rq);
return -ENOMEM;
@ -545,7 +558,7 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
rq->cmd = (unsigned char *)cmd;
rq->cmd_len = sizeof(struct nvme_nvm_command);
rq->special = (void *)0;
rq->special = cmd + 1;
rq->end_io_data = rqd;

1
include/linux/lightnvm.h
View File

@ -242,6 +242,7 @@ struct nvm_rq {
uint16_t nr_pages;
uint16_t flags;
u64 ppa_status; /* ppa media status */
int error;
};