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Re: [Xen-devel] swiotlb-xen question

On Wed, 2014-03-26 at 12:35 +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).
> 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?

I've not heard of anyone doing so, please feel free to take this on.


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