Re: [PATCH virtio] virtio: virtio_console: fix DMA memory allocation for rproc serial

[Christoph Hellwig]

On Mon, Nov 16, 2020 at 04:51:49AM -0500, Michael S. Tsirkin wrote:
> On Mon, Nov 16, 2020 at 09:19:50AM +0000, Christoph Hellwig wrote:
> > I just noticed this showing up in Linus' tree and I'm not happy.
> > 
> > This whole model of the DMA subdevices in remoteproc is simply broken.
> > 
> > We really need to change the virtio code pass an expicit DMA device (
> > similar to what e.g. the USB and RDMA code does),
> 
> Could you point me at an example or two please?

Take a look at the ib_dma_* helper in include/rdma/ib_verbs.h and
dma_device member in struct ib_device for the best example.