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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