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| author | Christoph Hellwig <hch@lst.de> | 2019-03-03 08:19:18 -0700 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-04-05 08:07:57 +0200 |
| commit | 783b94bd9250478154904fa782d2cfc46336cdf6 (patch) | |
| tree | 9110a3fc21bf023b55d9284902e2a9e56cff9ea3 /drivers/nvme | |
| parent | b15c592de37ed9d71499a3b8a750d1b235fcba3d (diff) | |
| download | linux-783b94bd9250478154904fa782d2cfc46336cdf6.tar.gz linux-783b94bd9250478154904fa782d2cfc46336cdf6.tar.bz2 linux-783b94bd9250478154904fa782d2cfc46336cdf6.zip | |
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>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 030ee94452dd..0679ac7fed19 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -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) - 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)) + 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; - - 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; |