[RFC PATCH 06/12] drm/virtio: implement context init: track {ring_idx, emit_fence_info} in virtio_gpu_fence

[Gurchetan Singh <gurchetansingh@chromium.org>]

Each fence should be associated with a [fence ID, fence_context,
seqno].  The seqno number is just the fence id.

To get the fence context, we add the ring_idx to the 3D context's
base_fence_ctx.  The ring_idx is between 0 and 31, inclusive.

Each 3D context will have it's own base_fence_ctx. The ring_idx will
be emitted to host userspace, when emit_fence_info is true.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Lingfeng Yang <lfy@google.com>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 9996abf60e3a..401aec1a5efb 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -139,7 +139,9 @@ struct virtio_gpu_fence_driver {
 
 struct virtio_gpu_fence {
 	struct dma_fence f;
+	uint32_t ring_idx;
 	uint64_t fence_id;
+	bool emit_fence_info;
 	struct virtio_gpu_fence_driver *drv;
 	struct list_head node;
 };
-- 
2.33.0.259.gc128427fd7-goog