drm/gem_shmem: Use a writecombine mapping for ->vaddr
Right now, the BO is mapped as a cached region when ->vmap() is called and the underlying object is not a dmabuf. Doing that makes cache management a bit more complicated (you'd need to call dma_map/unmap_sg() on the ->sgt field everytime the BO is about to be passed to the GPU/CPU), so let's map the BO with writecombine attributes instead (as done in most drivers). Fixes: 2194a63a ("drm: Add library for shmem backed GEM objects") Signed-off-by: NBoris Brezillon <boris.brezillon@collabora.com> Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: NEric Anholt <eric@anholt.net> Signed-off-by: NRob Herring <robh@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190529065121.13485-1-boris.brezillon@collabora.com
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