On Tue, Apr 5, 2022 at 10:38 AM Rob Clark <robdclark@xxxxxxxxx> wrote:
>
> From: Rob Clark <robdclark@xxxxxxxxxxxx>
>
> It would have been cleaner to have a flag to *request* the fence event.
> But that ship has sailed. So add a flag so that userspace which doesn't
> care about the events can opt-out.
>
> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Reviewed-by: Chia-I Wu <olvaffe@xxxxxxxxx>
Might want to wait for Gurchetan to chime in as he added the mechanism.
> ---
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 8 +++++---
> include/uapi/drm/virtgpu_drm.h | 2 ++
> 2 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index 3a8078f2ee27..09f1aa263f91 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -225,9 +225,11 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
> goto out_unresv;
> }
>
> - ret = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
> - if (ret)
> - goto out_unresv;
> + if (!(exbuf->flags & VIRTGPU_EXECBUF_NO_EVENT)) {
> + ret = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
> + if (ret)
> + goto out_unresv;
> + }
>
> if (out_fence_fd >= 0) {
> sync_file = sync_file_create(&out_fence->f);
> diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h
> index 0512fde5e697..d06cac3407cc 100644
> --- a/include/uapi/drm/virtgpu_drm.h
> +++ b/include/uapi/drm/virtgpu_drm.h
> @@ -52,10 +52,12 @@ extern "C" {
> #define VIRTGPU_EXECBUF_FENCE_FD_IN 0x01
> #define VIRTGPU_EXECBUF_FENCE_FD_OUT 0x02
> #define VIRTGPU_EXECBUF_RING_IDX 0x04
> +#define VIRTGPU_EXECBUF_NO_EVENT 0x08
> #define VIRTGPU_EXECBUF_FLAGS (\
> VIRTGPU_EXECBUF_FENCE_FD_IN |\
> VIRTGPU_EXECBUF_FENCE_FD_OUT |\
> VIRTGPU_EXECBUF_RING_IDX |\
> + VIRTGPU_EXECBUF_NO_EVENT |\
> 0)
>
> struct drm_virtgpu_map {
> --
> 2.35.1
>
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