Mikko Perttunen c2d209f066 drm/tegra: gem: Don't attach dma-bufs when not needed ...

The dma-buf import code currently attaches and maps all imported
dma-bufs to the drm device to get their sgt for mapping to the
directly managed IOMMU domain.

In many cases, like for newer chips (Tegra186+), the directly
managed IOMMU domain is, however, not used. Mapping to the drm
device can also cause issues e.g. with swiotlb since it is not
a real device.

To improve the situation, only attach and map imported dma-bufs
when required.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Change-Id: If73cc4e9419a2eebf67269eadb34050986f73077
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3090413
Reviewed-by: Santosh BS <santoshb@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

2024-03-15 13:05:54 -07:00

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