On Fri, Jan 25, 2019 at 09:45:26AM +, Peng Fan wrote:
> Just have a question,
>
> Since vmalloc_to_page is ok for cma area, no need to take cma and per device
> cma into consideration right?
The CMA area itself it a physical memory region. If it is a non-highmem
region you can call
On Tue, Jan 22, 2019 at 11:59:31AM -0800, Stefano Stabellini wrote:
> > if (!virtio_has_iommu_quirk(vdev))
> > return true;
> >
> > @@ -260,7 +262,7 @@ static bool vring_use_dma_api(struct virtio_device
> > *vdev)
> > * the DMA API if we're a Xen guest, which at least
On Mon, Jan 21, 2019 at 04:51:57AM +, Peng Fan wrote:
> on i.MX8QM, M4_1 is communicating with DomU using rpmsg with a fixed
> address as the dma mem buffer which is predefined.
>
> Without this patch, the flow is:
> vring_map_one_sg -> vring_use_dma_api
> -> dma_map_page
>
