linux-kernel - [PATCH 2/2] nvme-pci: fix metadata mapping length

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Date:   Wed, 12 Apr 2023 14:24:43 +0900
From:   Jinyoung CHOI <j-young.choi@...sung.com>
To:     "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "chaitanya.kulkarni@....com" <chaitanya.kulkarni@....com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] nvme-pci: fix metadata mapping length

Even if the memory allocated for integrity is physically continuous,
struct bio_vec is composed separately for each page size.
In order not to use the blk_rq_map_integrity_sg(), the length of the
DMA mapping should be the total size of integrity payload.

Fixes: 783b94bd9250 ("nvme-pci: do not build a scatterlist to map metadata")
Signed-off-by: Jinyoung Choi <j-young.choi@...sung.com>
---
 drivers/nvme/host/pci.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 593f86323e25..611c677add67 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -827,8 +827,10 @@ static blk_status_t nvme_map_metadata(struct nvme_dev *dev, struct request *req,
 {
 	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
 
-	iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req),
-			rq_dma_dir(req), 0);
+	iod->meta_dma = dma_map_page(dev->dev, rq_integrity_vec(req)->bv_page,
+				     rq_integrity_vec(req)->bv_offset,
+				     rq_integrity_payload_size(req),
+				     rq_dma_dir(req));
 	if (dma_mapping_error(dev->dev, iod->meta_dma))
 		return BLK_STS_IOERR;
 	cmnd->rw.metadata = cpu_to_le64(iod->meta_dma);
@@ -968,7 +970,8 @@ static __always_inline void nvme_pci_unmap_rq(struct request *req)
 	        struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
 
 		dma_unmap_page(dev->dev, iod->meta_dma,
-			       rq_integrity_vec(req)->bv_len, rq_data_dir(req));
+			       rq_integrity_payload_size(req),
+			       rq_data_dir(req));
 	}
 
 	if (blk_rq_nr_phys_segments(req))
-- 
2.34.1