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This adds map and unmap functions to GBM utilizing the DRIimage extension mapImage/unmapImage functions or existing internal mapping for dumb buffers. Unlike prior attempts, this version provides a region to map and usage flags for the mapping. The operation follows the same semantics as the gallium transfer_map() function. This was tested with GBM based gralloc on Android. Signed-off-by: Rob Herring <robh@kernel.org> [Emil Velikov: drop no longer relevant hunk from commit message.] Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net>
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