From: Jianxiong Gao jxgao@google.com
commit: 3d2d861eb03e8ee96dc430a54361c900cbe28afd
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvme/host/pci.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2634,6 +2634,7 @@ static void nvme_reset_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);