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authorChristoph Hellwig <hch@lst.de>2019-06-05 21:08:24 +0200
committerJens Axboe <axboe@kernel.dk>2019-06-05 13:18:39 -0600
commita48bc520011ea7a701826a9e3a770b128f283328 (patch)
tree1037387fee23197198565f5bcf2d1ebc4125f462
parent98d669b49120bad6a09c361daa71c92e6a9f8fbb (diff)
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nvme-pci: don't limit DMA segement size
NVMe uses PRPs (or optionally unlimited SGLs) for data transfers and has no specific limit for a single DMA segement. Limiting the size will cause problems because the block layer assumes PRP-ish devices using a virt boundary mask don't have a segment limit. And while this is true, we also really need to tell the DMA mapping layer about it, otherwise dma-debug will trip over it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Sebastian Ott <sebott@linux.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/nvme/host/pci.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index f562154551ce..524d6bd6d095 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2513,6 +2513,12 @@ static void nvme_reset_work(struct work_struct *work)
*/
dev->ctrl.max_hw_sectors = NVME_MAX_KB_SZ << 1;
dev->ctrl.max_segments = NVME_MAX_SEGS;
+
+ /*
+ * Don't limit the IOMMU merged segment size.
+ */
+ dma_set_max_seg_size(dev->dev, 0xffffffff);
+
mutex_unlock(&dev->shutdown_lock);
/*