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These ioctls can be used to synchronize CPU/GPU access to a buffer. BUG=chrome-os-partner:33438 TEST=add CONFIG_DRM_DMA_SYNC=y, in conjunction with xf86-video-armsoc change,\ run any X application, like xev Change-Id: I8065ec465ebd0cb6abe128a3e7d92a8f74a88928 Signed-off-by: Dominik Behr <dbehr@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/229441 Reviewed-by: Daniel Kurtz <djkurtz@chromium.org> Conflicts: drivers/gpu/drm/rockchip/rockchip_drm_drv.c drivers/gpu/drm/rockchip/rockchip_drm_drv.h drivers/gpu/drm/rockchip/rockchip_drm_gem.c (cherry picked from cros/chromeos-3.14 commit a847e1f492cbd186116c01a3f56575320dc87152) Signed-off-by: ZhengShunQian <zhengsq@rock-chips.com>