On Wed, Nov 11, 2015 at 11:29:09AM +0100, Maarten Lankhorst wrote:
> From: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
>
> This is useful for all the boilerplate code about cleaning old_fb.
> ---
> drivers/gpu/drm/drm_atomic.c | 58 ++++++++++++++++++++++++++++++--------------
> include/drm/drm_atomic.h | 3 +++
> 2 files changed, 43 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 0ac31b1ecb67..aeee083c7f95 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1432,6 +1432,45 @@ static int atomic_set_prop(struct drm_atomic_state *state,
> return ret;
> }
>
> +/**
> + * drm_atomic_update_old_fb -- Unset old_fb pointers and set plane->fb pointers.
> + *
> + * @dev: drm device to check.
> + * @plane_mask: plane mask for planes that were updated.
> + * @ret: return value, can be -EDEADLK for a retry.
> + *
> + * Before doing an update plane->old_fb is set to plane->fb,
> + * but before dropping the locks old_fb needs to be set to NULL
> + * and plane->fb updated. This is a common operation for each
> + * atomic update, so this call is split off as a helper.
> + */
> +void drm_atomic_clean_old_fb(struct drm_device *dev,
> + unsigned plane_mask,
> + int ret)
A drm_atomic_prepare_old_fb inline to encapsulate the prep step would have
been neat imo. Anyway: Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> +{
> + struct drm_plane *plane;
> +
> + /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
> + * locks (ie. while it is still safe to deref plane->state). We
> + * need to do this here because the driver entry points cannot
> + * distinguish between legacy and atomic ioctls.
> + */
> + drm_for_each_plane_mask(plane, dev, plane_mask) {
> + if (ret == 0) {
> + struct drm_framebuffer *new_fb = plane->state->fb;
> + if (new_fb)
> + drm_framebuffer_reference(new_fb);
> + plane->fb = new_fb;
> + plane->crtc = plane->state->crtc;
> +
> + if (plane->old_fb)
> + drm_framebuffer_unreference(plane->old_fb);
> + }
> + plane->old_fb = NULL;
> + }
> +}
> +EXPORT_SYMBOL(drm_atomic_clean_old_fb);
> +
> int drm_mode_atomic_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv)
> {
> @@ -1577,24 +1616,7 @@ retry:
> }
>
> out:
> - /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
> - * locks (ie. while it is still safe to deref plane->state). We
> - * need to do this here because the driver entry points cannot
> - * distinguish between legacy and atomic ioctls.
> - */
> - drm_for_each_plane_mask(plane, dev, plane_mask) {
> - if (ret == 0) {
> - struct drm_framebuffer *new_fb = plane->state->fb;
> - if (new_fb)
> - drm_framebuffer_reference(new_fb);
> - plane->fb = new_fb;
> - plane->crtc = plane->state->crtc;
> -
> - if (plane->old_fb)
> - drm_framebuffer_unreference(plane->old_fb);
> - }
> - plane->old_fb = NULL;
> - }
> + drm_atomic_clean_old_fb(dev, plane_mask, ret);
>
> if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
> /*
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index e67aeac2aee0..4b74c97d297a 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -136,6 +136,9 @@ drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
>
> void drm_atomic_legacy_backoff(struct drm_atomic_state *state);
>
> +void
> +drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);
> +
> int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
> int __must_check drm_atomic_commit(struct drm_atomic_state *state);
> int __must_check drm_atomic_async_commit(struct drm_atomic_state *state);
> --
> 2.1.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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