: 05adbee3ad528100ab0285c15c91100e19e10138
patch link:
https://lore.kernel.org/r/20250722-ums9230-drm-v2-14-054276ec213d%40abscue.de
patch subject: [PATCH v2 14/15] drm: sprd: implement IOMMU-based buffer
management
config: hexagon-randconfig-r132-20250724
(https://download.01.org/0day-ci/archive/20250724
The default GEM DMA helpers use the DMA API to allocate and map buffers.
Since the DMA API integrates IOMMU support only in simple cases where the
main device has one IOMMU attached to it, this is not sufficient for
Unisoc SoCs in which multiple DPU instances with separate IOMMUs can
exist. Althoug
