On Fri, Jul 26, 2019 at 4:41 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > 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. Thanks for taking a look at this thread. Unfortunately that wouldn't work. We have a specific reserved memory pool that is the only memory area accessible to one of the devices. Any idea how to handle this? Best regards, Tomasz
