drm: Add helpers for setting up an array of dma_fence dependencies.
I needed to add implicit dependency support for v3d, and Rob Herring has been working on it for panfrost, and I had recently looked at the lima implementation so I think this will be a good intersection of what we all want and simplify our scheduler implementations. v2: Rebase on xa_limit_32b API change, and tiny checkpatch cleanups on the way in (unsigned int vs unsigned, extra return before EXPORT_SYMBOL_GPL) Signed-off-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20190401222635.25013-6-eric@anholt.net Reviewed-and-tested-by: Qiang Yu <yuq825@gmail.com> (v1)
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