drm/i915/gem: Allow backends to override pread implementation
As there are more and more complicated interactions between the different backing stores and userspace, push the control into the backends rather than accumulate them all inside the ioctl handlers. Signed-off-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20201105154934.16022-1-chris@chris-wilson.co.uk (cherry picked from commit 0049b688) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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