drm/i915/selftests: Compare user mmap against GPU
Check that the user writes into their mmap are visible on the GPU. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Acked-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200103204137.2131004-3-chris@chris-wilson.co.uk
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