From: Christoph Hellwig hch@lst.de
'commit 3d2d861eb03e ("nvme-pci: set min_align_mask")'
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 --- --- drivers/nvme/host/pci.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 3be352403839..dddccfe82abc 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2590,6 +2590,7 @@ 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);