Re: [RFC, v3 9/9] media: platform: Add Mediatek ISP P1 shared memory device

Christoph Hellwig
2019-07-26T07:41:16Z

On Fri, Jul 26, 2019 at 02:15:14PM +0900, Tomasz Figa wrote:
> Could you try dma_get_sgtable() with the SCP struct device and then
> dma_map_sg() with the P1 struct device?

Please don't do that. dma_get_sgtable is a pretty broken API (see
the common near the arm implementation) and we should not add more
users of it. If you want a piece of memory that can be mapped to
multiple devices allocate it using alloc_pages and then just map
it to each device.