Hi Niklas,
On Tue, Sep 27, 2016 at 3:20 PM, Niklas Söderlund
<niklas.soderlund@xxxxxxxxxxxx> wrote:
> Hi Magnus,
>
> On 2016-09-20 20:54:33 +0900, Magnus Damm wrote:
>> From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
>>
>> Here's some prototype code that works around the lack of software
>> support for mapping I/O devices to the SYS-DMAC hardware via the
>> DMA Engine framework when using IOMMU.
>>
>> The code itself is one big layering violation that goes through
>> the DT and unconditionally maps I/O devices using DMACs via the
>> IPMMU device instance into iova space with a 1:1 mapping.
>>
>> This very short term prototype will for instance automatically make
>> the SCIF serial port function with the IPMMU hardware in case the
>> SYS-DMAC is hooked up to the IPMMU device.
>>
>> Not to be confused with the more long term solution to allow the
>> DMA Engine framework to map I/O device memory dynamically.
>
> Good news, Vinod queued the dma_{map,unmap}_resource API and rcar-dmac
> usage of it yesterday \o/.
Excellent. Are the DMA Engine slave devices supposed to work out of
the box with the IPMMU then, or is some other component missing?
Cheers,
/ magnus
