[PATCH 5.5 110/189] drm/virtio: fix mmap page attributes

[Greg Kroah-Hartman]

From: Gerd Hoffmann <kraxel@xxxxxxxxxx>

commit 6be7e07335486f5731cab748d80c68f20896581f upstream.

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

Cc: stable@xxxxxxxxxxxxxxx
Fixes: c66df701e783 ("drm/virtio: switch from ttm to gem shmem helpers")
Reported-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
Reported-by: Guillaume Gardet <Guillaume.Gardet@xxxxxxx>
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Reviewed-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
Tested-by: Guillaume Gardet <Guillaume.Gardet@xxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20200226154752.24328-3-kraxel@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/virtio/virtgpu_object.c |    1 +
 1 file changed, 1 insertion(+)

--- 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
 		return NULL;
 
 	bo->base.base.funcs = &virtio_gpu_gem_funcs;
+	bo->base.map_cached = true;
 	return &bo->base.base;
 }