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nvme-pci: set min_align_mask

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The PRP addressing scheme requires all PRP entries except for the
first one to have a zero offset into the NVMe controller pages (which
can be different from the Linux PAGE_SIZE).  Use the min_align_mask
device parameter to ensure that swiotlb does not change the address
of the buffer modulo the device page size to ensure that the PRPs
won't be malformed.

Signed-off-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jianxiong Gao 2021-02-01 10:30:17 -08:00 committed by Konrad Rzeszutek Wilk
parent 1f221a0d0d
commit 3d2d861eb0
1 changed files with 1 additions and 0 deletions
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drivers/nvme/host/pci.c
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@ -2629,6 +2629,7 @@ static void nvme_reset_work(struct work_struct *work)
* Don't limit the IOMMU merged segment size.
*/
dma_set_max_seg_size(dev->dev, 0xffffffff);
dma_set_min_align_mask(dev->dev, NVME_CTRL_PAGE_SIZE - 1);
mutex_unlock(&dev->shutdown_lock);