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.

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