[PATCH v3 7/7] [wip] virtio-gpu: add page flip support

[Daniel Vetter]

On Fri, Oct 2, 2015 at 1:58 PM, Gerd Hoffmann <kraxel at redhat.com> wrote:
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>

So I entirely missed this, but this isn't really how to implement
page_flip for an atomic driver. Working on some stuff and will hack up
a likely totally broken patch, but should be enough as guideline.
-Daniel

> ---
>  drivers/gpu/drm/virtio/virtgpu_display.c | 49 ++++++++++++++++++++++++++++++--
>  1 file changed, 46 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
> index c9c1427..f545913 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_display.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_display.c
> @@ -125,6 +125,51 @@ static int virtio_gpu_crtc_cursor_move(struct drm_crtc *crtc,
>         return 0;
>  }
>
> +static int virtio_gpu_page_flip(struct drm_crtc *crtc,
> +                               struct drm_framebuffer *fb,
> +                               struct drm_pending_vblank_event *event,
> +                               uint32_t flags)
> +{
> +       struct virtio_gpu_device *vgdev = crtc->dev->dev_private;
> +       struct virtio_gpu_output *output =
> +               container_of(crtc, struct virtio_gpu_output, crtc);
> +       struct drm_plane *plane = crtc->primary;
> +       struct virtio_gpu_framebuffer *vgfb;
> +       struct virtio_gpu_object *bo;
> +       unsigned long irqflags;
> +       uint32_t handle;
> +
> +       plane->fb = fb;
> +       vgfb = to_virtio_gpu_framebuffer(plane->fb);
> +       bo = gem_to_virtio_gpu_obj(vgfb->obj);
> +       handle = bo->hw_res_handle;
> +
> +       DRM_DEBUG("handle 0x%x%s, crtc %dx%d\n", handle,
> +                 bo->dumb ? ", dumb" : "",
> +                 crtc->mode.hdisplay, crtc->mode.vdisplay);
> +       if (bo->dumb) {
> +               virtio_gpu_cmd_transfer_to_host_2d
> +                       (vgdev, handle, 0,
> +                        cpu_to_le32(crtc->mode.hdisplay),
> +                        cpu_to_le32(crtc->mode.vdisplay),
> +                        0, 0, NULL);
> +       }
> +       virtio_gpu_cmd_set_scanout(vgdev, output->index, handle,
> +                                  crtc->mode.hdisplay,
> +                                  crtc->mode.vdisplay, 0, 0);
> +       virtio_gpu_cmd_resource_flush(vgdev, handle, 0, 0,
> +                                     crtc->mode.hdisplay,
> +                                     crtc->mode.vdisplay);
> +
> +       if (event) {
> +               spin_lock_irqsave(&crtc->dev->event_lock, irqflags);
> +               drm_send_vblank_event(crtc->dev, -1, event);
> +               spin_unlock_irqrestore(&crtc->dev->event_lock, irqflags);
> +       }
> +
> +       return 0;
> +}
> +
>  static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
>         .cursor_set2            = virtio_gpu_crtc_cursor_set,
>         .cursor_move            = virtio_gpu_crtc_cursor_move,
> @@ -132,9 +177,7 @@ static const struct drm_crtc_funcs virtio_gpu_crtc_funcs = {
>         .set_config             = drm_atomic_helper_set_config,
>         .destroy                = drm_crtc_cleanup,
>
> -#if 0 /* not (yet) working without vblank support according to docs */
> -       .page_flip              = drm_atomic_helper_page_flip,
> -#endif
> +       .page_flip              = virtio_gpu_page_flip,
>         .reset                  = drm_atomic_helper_crtc_reset,
>         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
>         .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
> --
> 1.8.3.1
>
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch