drm/virtio: fix mmap page attributes

virtio-gpu uses cached mappings, set
drm_gem_shmem_object.map_cached accordingly.

Cc: stable@vger.kernel.org
Fixes: c66df701e783 ("drm/virtio: switch from ttm to gem shmem helpers")
Reported-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reported-by: Guillaume Gardet <Guillaume.Gardet@arm.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Guillaume Gardet <Guillaume.Gardet@arm.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200226154752.24328-3-kraxel@redhat.com

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index 890121a..3af7ec8 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -99,6 +99,7 @@ struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
                return NULL;
 
        bo->base.base.funcs = &virtio_gpu_gem_funcs;
+       bo->base.map_cached = true;
        return &bo->base.base;
 }