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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>
This commit is contained in:
Christoph Hellwig 2019-06-05 21:08:24 +02:00 committed by Jens Axboe
parent 98d669b491
commit a48bc52001
1 changed files with 6 additions and 0 deletions
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6
drivers/nvme/host/pci.c
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@ -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);
/*