Re: [Xen-devel] swiotlb-xen question

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Mar 26, 2014 at 12:35:12PM +0200, Oleksandr Dmytryshyn wrote:
> Hi to all.
> 
> Currently I'm using hypervisor on ARM Cortex A15 processor (DRA7xx
> Jacinto 6 processor). I'm using mainline xen 4.4 with some patches on
> top plus dom0 and domU linux kernel 3.8.
> 
> I've written a hack to make a camera working on my board in dom0
> (drivers for camera and display system are in dom0). An user-space
> application in dom0 is used to test camera (it reads camera captured
> data and sends it to the framebuffer). In the kernel code I've implemented
> .mmap callback function in the swiotlb-xen.c file (like xen_swiotlb_mmap())
> and copied to this new callback all content from the original function
> 'arm_dma_mmap()' from the kernel. This function creates userspace
> mapping for the DMA-coherent memory. With this hack camera is working
> (I can see captured video on display).

Why can't you use the v4l API? Won't that work?
> 
> For now I have little understanding how swiotlb-xen is working. Currently in 
> the
> mainline linux kernel this callback is not implemented.
> 
> Here is my question.
> Does anyone know are there any plans to implement
> this callback for swiotlb-xen (in linux kernel) in the right way?
> 
> Oleksandr Dmytryshyn | Product Engineering and Development
> GlobalLogic
> P x3657  M +38.067.382.2525
> www.globallogic.com
> 
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