shadow: Use a cacheable shadow for all generations

Always avoid direct rendering to the uncached scanout buffer,
redirecting all 2D access to the shadow instead. Then for the couple of
platforms where either the BLT is not ready or cannot be trusted (i8xx)
perform the front buffer fixup using the uncached writes from the CPU.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit 4bf2182bf9ee64795e2bf524fedf7b6c36f3cd03)

Conflicts:

	src/intel_shadow.c

0 files changed, 0 insertions, 0 deletions