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| author | Ming Lin <ming.l@ssi.samsung.com> | 2016-03-22 10:24:43 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-04-12 22:44:00 +0300 |
| commit | 58b45602751ddf16e57170656670aa5a8f78eeca (patch) | |
| tree | e8bbe385e5f4fd4dea3139937db75b66fcf022a5 | |
| parent | 2e39e0f608c130411f52c9fe5648dbcda5e28528 (diff) | |
| download | linux-58b45602751ddf16e57170656670aa5a8f78eeca.tar.xz | |
nvme: add helper nvme_map_len()
The helper returns the number of bytes that need to be mapped
using PRPs/SGL entries.
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | drivers/nvme/host/nvme.h | 8 | ||||
| -rw-r--r-- | drivers/nvme/host/pci.c | 13 |
2 files changed, 13 insertions, 8 deletions
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index f846da4eb338..6376cd71cc9f 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -173,6 +173,14 @@ static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector) return (sector >> (ns->lba_shift - 9)); } +static inline unsigned nvme_map_len(struct request *rq) +{ + if (rq->cmd_flags & REQ_DISCARD) + return sizeof(struct nvme_dsm_range); + else + return blk_rq_bytes(rq); +} + static inline void nvme_setup_flush(struct nvme_ns *ns, struct nvme_command *cmnd) { diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 154194e33c31..d23ede73537d 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -334,16 +334,11 @@ static __le64 **iod_list(struct request *req) return (__le64 **)(iod->sg + req->nr_phys_segments); } -static int nvme_init_iod(struct request *rq, struct nvme_dev *dev) +static int nvme_init_iod(struct request *rq, unsigned size, + struct nvme_dev *dev) { struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); int nseg = rq->nr_phys_segments; - unsigned size; - - if (rq->cmd_flags & REQ_DISCARD) - size = sizeof(struct nvme_dsm_range); - else - size = blk_rq_bytes(rq); if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC); @@ -637,6 +632,7 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, struct nvme_dev *dev = nvmeq->dev; struct request *req = bd->rq; struct nvme_command cmnd; + unsigned map_len; int ret = BLK_MQ_RQ_QUEUE_OK; /* @@ -652,7 +648,8 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, } } - ret = nvme_init_iod(req, dev); + map_len = nvme_map_len(req); + ret = nvme_init_iod(req, map_len, dev); if (ret) return ret; |