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nvme: add helper nvme_map_len()

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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>
This commit is contained in:
Ming Lin
2016-03-22 00:24:43 -07:00
committed by Jens Axboe
parent 2e39e0f608
commit 58b4560275
2 changed files with 13 additions and 8 deletions
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13
drivers/nvme/host/pci.c
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@@ -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;