linux-kernel - Re: [PATCH v3 3/4] drm/virtio: batch resource creation

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Date:   Thu, 13 Feb 2020 10:54:21 -0800
From:   Chia-I Wu <olvaffe@...il.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] drm/virtio: batch resource creation

On Thu, Feb 13, 2020 at 5:22 AM Gerd Hoffmann <kraxel@...hat.com> wrote:
>
> Move virtio_gpu_notify() to higher-level functions for
> virtio_gpu_cmd_create_resource(), virtio_gpu_cmd_resource_create_3d()
> and virtio_gpu_cmd_resource_attach_backing().
>
> virtio_gpu_object_create() will batch commands and notify only once when
> creating a resource.
>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_object.c | 1 +
>  drivers/gpu/drm/virtio/virtgpu_vq.c     | 3 ---
>  2 files changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
> index 8870ee23ff2b..65d6834d3c74 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_object.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_object.c
> @@ -224,6 +224,7 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>                 return ret;
The virtqueue might become full without ever being notified on errors.
We should notify on errors, or better yet, virtio_gpu_queue_ctrl_sgs
should notify before waiting.


>         }
>
> +       virtio_gpu_notify(vgdev);
>         *bo_ptr = bo;
>         return 0;
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 9d4ca0fafa5f..778b7acf2f7f 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -514,7 +514,6 @@ void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev,
>         cmd_p->height = cpu_to_le32(params->height);
>
>         virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
> -       virtio_gpu_notify(vgdev);
>         bo->created = true;
>  }
>
> @@ -643,7 +642,6 @@ virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev,
>         vbuf->data_size = sizeof(*ents) * nents;
>
>         virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
> -       virtio_gpu_notify(vgdev);
>  }
>
>  static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
> @@ -1010,7 +1008,6 @@ virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev,
>         cmd_p->flags = cpu_to_le32(params->flags);
>
>         virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
> -       virtio_gpu_notify(vgdev);
>
>         bo->created = true;
>  }
> --
> 2.18.2
>