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nvme-pci: do not build a scatterlist to map metadata 

We always have exactly one segment, so we can simply call dma_map_bvec.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
This commit is contained in:
Christoph Hellwig 2019-03-03 08:19:18 -07:00
parent b15c592de3
commit 783b94bd92
1 changed files with 10 additions and 13 deletions
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23
drivers/nvme/host/pci.c
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@ -221,7 +221,7 @@ struct nvme_iod {
int npages; /* In the PRP list. 0 means small pool in use */
int nents; /* Used in scatterlist */
dma_addr_t first_dma;
struct scatterlist meta_sg; /* metadata requires single contiguous buffer */
dma_addr_t meta_dma;
struct scatterlist *sg;
struct scatterlist inline_sg[0];
};
@ -592,13 +592,16 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
dma_addr_t dma_addr = iod->first_dma, next_dma_addr;
int i;
if (blk_integrity_rq(req)) {
dma_unmap_page(dev->dev, iod->meta_dma,
rq_integrity_vec(req)->bv_len, dma_dir);
}
if (iod->nents) {
/* P2PDMA requests do not need to be unmapped */
if (!is_pci_p2pdma_page(sg_page(iod->sg)))
dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
if (blk_integrity_rq(req))
dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
}
if (iod->npages == 0)
@ -861,17 +864,11 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
ret = BLK_STS_IOERR;
if (blk_integrity_rq(req)) {
if (blk_rq_count_integrity_sg(q, req->bio) != 1)
iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req),
dma_dir, 0);
if (dma_mapping_error(dev->dev, iod->meta_dma))
goto out;
sg_init_table(&iod->meta_sg, 1);
if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1)
goto out;
if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
goto out;
cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg));
cmnd->rw.metadata = cpu_to_le64(iod->meta_dma);
}
return BLK_STS_OK;