[PATCH 0/8] Host1x IOMMU support + VIC support

Mikko Perttunen cyndis at kapsi.fi
Mon Dec 5 19:58:05 UTC 2016


On 12/05/2016 09:51 PM, Thierry Reding wrote:
> On Thu, Nov 10, 2016 at 08:23:37PM +0200, Mikko Perttunen wrote:
>> This series adds IOMMU support to Host1x and TegraDRM
>> and adds support for the VIC host1x client so that
>> host1x can be tested on modern Tegra platforms.
>> It depends on the previous fix series. The whole thing
>> (modulo patch order) is available as a git repository at
>> git://github.com/cyndis/linux.git; branch vic-v1.
>>
>> IO memory management is organized such that there are
>> two domains: the host1x domain and the tegradrm domain.
>> The host1x domain is used by the host1x engine and
>> contains the host1x CDMA and pushbuffers for submitted
>> jobs.
>>
>> The tegradrm domain is shared by all host1x units and
>> contains GEM objects and memory allocated by the
>> separate tegra_drm_alloc function. This function is
>> currently used to allocate space for firmware blobs
>> in the tegradrm domain.
>>
>> A userspace test case for VIC can be found at
>> https://github.com/cyndis/drm/tree/work/tegra.
>> The testcase is in tests/tegra and is called submit_vic.
>> The in-kernel firewall is not implemented for VIC;
>> therefore, IOMMU must be enabled for the test to pass.
>>
>> Tested with Jetson TX1 (T210). Probably works also
>> with Jetson TK1 (T124). Note that due to hardware changes
>> the testcase also needs to be changed to run properly
>> on T124.
>
> What's the scope of the changes required for Tegra124? If we add the
> kernel bits for Tegra124 we should also have a userspace test program to
> exercise it.

There should be no change needed to the kernel driver for T124. For the 
userspace test, removing the one or two topmost commits in my repo will 
put the testcase to a form working on T124 - I was lazy and just 
modified the original file. Should be reasonably easy to have the test 
case support both chips, though.

>
> Thanks,
> Thierry
>

Cheers,
Mikko.


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