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

[Thierry Reding <thierry.reding@gmail.com>]

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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.

Thanks,
Thierry

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