drm/virtio: implement blob resources: report blob mem to userspace

The stride field has never been used, so repurpose it to be
"blob_mem". This way, userspace can know the memory properties
of the blob if it's passed between userspace processes and
no suitable userspace API exists to transmit that knowledge.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200924003214.662-17-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 0bf789f2bfdecd9b11d081d838fc7b6532cb91f3..b0c9dd171ad8a0306ea6cb92d5b7ed0ee966b968 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -301,6 +301,9 @@ static int virtio_gpu_resource_info_ioctl(struct drm_device *dev, void *data,
 
        ri->size = qobj->base.base.size;
        ri->res_handle = qobj->hw_res_handle;
+       if (qobj->host3d_blob || qobj->guest_blob)
+               ri->blob_mem = qobj->blob_mem;
+
        drm_gem_object_put(gobj);
        return 0;
 }