drm/virtio: implement context init: plumb {base_fence_ctx, ring_idx} to virtio_gpu_fence_alloc

These were defined in the previous commit. We'll need these
parameters when allocating a dma_fence.  The use case for this
is multiple synchronizations timelines.

The maximum number of timelines per 3D instance will be 32. Usually,
only 2 are needed -- one for CPU commands, and another for GPU
commands.

As such, we'll need to specify these parameters when allocating a
dma_fence.

vgdev->fence_drv.context is the "default" fence context for 2D mode
and old userspace.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Acked-by: Lingfeng Yang <lfy@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210921232024.817-8-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -426,8 +426,9 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
 					int index);
 
 /* virtgpu_fence.c */
-struct virtio_gpu_fence *virtio_gpu_fence_alloc(
-	struct virtio_gpu_device *vgdev);
+struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev,
+						uint64_t base_fence_ctx,
+						uint32_t ring_idx);
 void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
 			  struct virtio_gpu_ctrl_hdr *cmd_hdr,
 			  struct virtio_gpu_fence *fence);

drivers/gpu/drm/virtio/virtgpu_fence.c

@@ -71,7 +71,9 @@ static const struct dma_fence_ops virtio_gpu_fence_ops = {
 	.timeline_value_str  = virtio_gpu_timeline_value_str,
 };
 
-struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
+struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev,
+						uint64_t base_fence_ctx,
+						uint32_t ring_idx)
 {
 	struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
 	struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence),

drivers/gpu/drm/virtio/virtgpu_ioctl.c

@@ -173,7 +173,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 			goto out_memdup;
 	}
 
-	out_fence = virtio_gpu_fence_alloc(vgdev);
+	out_fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
 	if(!out_fence) {
 		ret = -ENOMEM;
 		goto out_unresv;
@@ -288,7 +288,7 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
 	if (params.size == 0)
 		params.size = PAGE_SIZE;
 
-	fence = virtio_gpu_fence_alloc(vgdev);
+	fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
 	if (!fence)
 		return -ENOMEM;
 	ret = virtio_gpu_object_create(vgdev, &params, &qobj, fence);
@@ -367,7 +367,7 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
 	if (ret != 0)
 		goto err_put_free;
 
-	fence = virtio_gpu_fence_alloc(vgdev);
+	fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
 	if (!fence) {
 		ret = -ENOMEM;
 		goto err_unlock;
@@ -427,7 +427,8 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
 			goto err_put_free;
 
 		ret = -ENOMEM;
-		fence = virtio_gpu_fence_alloc(vgdev);
+		fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context,
+					       0);
 		if (!fence)
 			goto err_unlock;
 

drivers/gpu/drm/virtio/virtgpu_plane.c

@@ -256,7 +256,8 @@ static int virtio_gpu_plane_prepare_fb(struct drm_plane *plane,
 		return 0;
 
 	if (bo->dumb && (plane->state->fb != new_state->fb)) {
-		vgfb->fence = virtio_gpu_fence_alloc(vgdev);
+		vgfb->fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context,
+						     0);
 		if (!vgfb->fence)
 			return -ENOMEM;
 	}