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<memeka>
is there a fix for EXYNOS_IOMMU=y and dmabuf import on DRM/KMS yet?
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<mszyprow>
memeka: which hw platform? on most exynos iommu works fine, but there are a few causing problems, which require some more work in the iommu core
<mszyprow>
memeka: dmabuf import/export should work with DRM/KMS
<memeka>
mszyprow: i'm using an odroid xu4, tried on both kernels 4.9 and 4.14 rc5
<mszyprow>
memeka: in case of odroids, it should be fine to enable IOMMU
<mszyprow>
memeka: odroid doesn't show any screen from the bootloader, so it is safe to have iommu enabled
<memeka>
w/o it, connecting USB3 hdd would be fine, but booting with the HDD connected would result in a big kernel crash when udev would want to do stuff
<mszyprow>
memeka: ok, I will try to check that too, please mail it again, so it will remind me to take a look into that
<mszyprow>
memeka: frankly, dwc3/usb3 should not use coherent pool for its memory allocations
<memeka>
no idea :P just letting you know what worked :)
<memeka>
i think it's the size of the xHCI ring
<memeka>
even with 1 usb2 connected (a wifi adapter), initially i was getting some errors when booting
<memeka>
some unhandled type of message
<mszyprow>
memeka: instead of that patch you can add "coherent_pool=1M" to your kernel command line