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Commit a48bc520 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
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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: default avatarChristoph Hellwig <hch@lst.de>
Reported-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 98d669b4

drivers/nvme/host/pci.c

+6 −0
Original line number Diff line number Diff line
@@ -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);



	/*