Re: [PATCH 3/3] virtio-gpu: use damage info for display updates.

[Chia-I Wu]

On Wed, Dec 11, 2019 at 12:42 AM Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/virtio/virtgpu_plane.c | 41 +++++++++++++++-----------
>  1 file changed, 24 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
> index 2e0d14e005db..1a0fbbb91ec7 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_plane.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
> @@ -24,6 +24,7 @@
>   */
>
>  #include <drm/drm_atomic_helper.h>
> +#include <drm/drm_damage_helper.h>
>  #include <drm/drm_fourcc.h>
>  #include <drm/drm_plane_helper.h>
>
> @@ -103,22 +104,26 @@ static int virtio_gpu_plane_atomic_check(struct drm_plane *plane,
>  }
>
>  static void virtio_gpu_update_dumb_bo(struct virtio_gpu_device *vgdev,
> -                                     struct virtio_gpu_object *bo,
> -                                     struct drm_plane_state *state)
> +                                     struct drm_plane_state *state,
> +                                     struct drm_rect *rect)
>  {
> +       struct virtio_gpu_object *bo =
> +               gem_to_virtio_gpu_obj(state->fb->obj[0]);
>         struct virtio_gpu_object_array *objs;
> +       uint32_t w = rect->x2 - rect->x1;
> +       uint32_t h = rect->y2 - rect->y1;
> +       uint32_t x = rect->x1 + (state->src_x >> 16);
> +       uint32_t y = rect->y1 + (state->src_y >> 16);
> +       uint32_t off = x * state->fb->format->cpp[0] +
> +               y * state->fb->pitches[0];
>
>         objs = virtio_gpu_array_alloc(1);
>         if (!objs)
>                 return;
>         virtio_gpu_array_add_obj(objs, &bo->base.base);
> -       virtio_gpu_cmd_transfer_to_host_2d
> -               (vgdev, 0,
> -                state->src_w >> 16,
> -                state->src_h >> 16,
> -                state->src_x >> 16,
> -                state->src_y >> 16,
> -                objs, NULL);
> +
> +       virtio_gpu_cmd_transfer_to_host_2d(vgdev, off, w, h, x, y,
> +                                          objs, NULL);
>  }
>
>  static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
> @@ -127,8 +132,8 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
>         struct drm_device *dev = plane->dev;
>         struct virtio_gpu_device *vgdev = dev->dev_private;
>         struct virtio_gpu_output *output = NULL;
> -       struct virtio_gpu_framebuffer *vgfb;
>         struct virtio_gpu_object *bo;
> +       struct drm_rect rect;
>
>         if (plane->state->crtc)
>                 output = drm_crtc_to_virtio_gpu_output(plane->state->crtc);
> @@ -146,12 +151,14 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
>                 return;
>         }
>
> +       if (!drm_atomic_helper_damage_merged(old_state, plane->state, &rect))
> +               return;
> +
>         virtio_gpu_disable_notify(vgdev);
>
> -       vgfb = to_virtio_gpu_framebuffer(plane->state->fb);
> -       bo = gem_to_virtio_gpu_obj(vgfb->base.obj[0]);
> +       bo = gem_to_virtio_gpu_obj(plane->state->fb->obj[0]);
>         if (bo->dumb)
> -               virtio_gpu_update_dumb_bo(vgdev, bo, plane->state);
> +               virtio_gpu_update_dumb_bo(vgdev, plane->state, &rect);
>
>         if (plane->state->fb != old_state->fb) {
>                 DRM_DEBUG("handle 0x%x, crtc %dx%d+%d+%d, src %dx%d+%d+%d\n",
> @@ -171,10 +178,10 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
>         }
>
>         virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle,
> -                                     plane->state->src_x >> 16,
> -                                     plane->state->src_y >> 16,
> -                                     plane->state->src_w >> 16,
> -                                     plane->state->src_h >> 16);
> +                                     (plane->state->src_x >> 16) + rect.x1,
> +                                     (plane->state->src_y >> 16) + rect.y1,
Digging into drm_atomic_helper_damage_merged, it seems rect uses
absolute values and is not relative to src_{x,y}.

> +                                     rect.x2 - rect.x1,
> +                                     rect.y2 - rect.y1);
>
>         virtio_gpu_enable_notify(vgdev);
>  }
> --
> 2.18.1
>
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