> From: Jason Wang <jasowang@redhat.com>
> Sent: Wednesday, 11 January 2023 8:28
> To: mst@redhat.com; jasowang@redhat.com
> Cc: Eli Cohen <elic@nvidia.com>; gdawar@amd.com;
> virtualization@lists.linux-foundation.org; linux-kernel@vger.kernel.org;
> tanuj.kamde@amd.com
> Subject: [PATCH 4/5] vdpa: set dma mask for vDPA device
>
> Setting DMA mask for vDPA device in case that there are virtqueue that
> is not backed by DMA so the vDPA device could be advertised as the DMA
> device that is used by DMA API for software emulated virtqueues.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
Tested-by: <elic@nvidia.com>
> ---
> drivers/vdpa/vdpa.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 8ef7aa1365cc..6821b2850bbb 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -39,6 +39,11 @@ static int vdpa_dev_probe(struct device *d)
> u32 max_num, min_num = 1;
> int ret = 0;
>
> + d->dma_mask = &d->coherent_dma_mask;
> + ret = dma_set_mask_and_coherent(d, DMA_BIT_MASK(64));
> + if (ret)
> + return ret;
> +
> max_num = ops->get_vq_num_max(vdev);
> if (ops->get_vq_num_min)
> min_num = ops->get_vq_num_min(vdev);
> --
> 2.25.1