Re: [RFC, v3 9/9] media: platform: Add Mediatek ISP P1 shared memory device
From: Tomasz Figa <tfiga@chromium.org>
Date: 2019-07-26 07:42:36
Also in:
linux-devicetree, linux-media, linux-mediatek
On Fri, Jul 26, 2019 at 4:41 PM Christoph Hellwig [off-list ref] wrote:
On Fri, Jul 26, 2019 at 02:15:14PM +0900, Tomasz Figa wrote:quoted
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel