On Thu, Dec 15, 2016 at 03:29:45PM +0100, Maarten Lankhorst wrote:
> From: Daniel Vetter <daniel.vetter@xxxxxxxx>
>
> This was somehow lost between v3 and the merged version in Maarten's
> patch merged as:
>
> commit f2d580b9a8149735cbc4b59c4a8df60173658140
> Author: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Date: Wed May 4 14:38:26 2016 +0200
>
> drm/core: Do not preserve framebuffer on rmfb, v4.
>
> Actual code copied from Maarten's patch, but with the slight change to
> just use dev->mode_config.funcs->atomic_commit to decide whether to
> use the atomic path or not.
>
> v2:
> - Remove plane->fb assignment, done by drm_atomic_clean_old_fb.
> - Add WARN_ON when atomic_remove_fb fails.
> - Always call drm_atomic_state_put.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Would be great if someone else could r-b this, I've proven pretty well
that I don't understand the complexity here :(
-Daniel
> ---
> drivers/gpu/drm/drm_atomic.c | 64 +++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/drm_crtc_internal.h | 1 +
> drivers/gpu/drm/drm_framebuffer.c | 7 ++++
> 3 files changed, 72 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index d1d252261bf1..23a3845542e1 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -2059,6 +2059,70 @@ static void complete_crtc_signaling(struct drm_device *dev,
> kfree(fence_state);
> }
>
> +int drm_atomic_remove_fb(struct drm_framebuffer *fb)
> +{
> + struct drm_modeset_acquire_ctx ctx;
> + struct drm_device *dev = fb->dev;
> + struct drm_atomic_state *state;
> + struct drm_plane *plane;
> + int ret = 0;
> + unsigned plane_mask;
> +
> + state = drm_atomic_state_alloc(dev);
> + if (!state)
> + return -ENOMEM;
> +
> + drm_modeset_acquire_init(&ctx, 0);
> + state->acquire_ctx = &ctx;
> +
> +retry:
> + plane_mask = 0;
> + ret = drm_modeset_lock_all_ctx(dev, &ctx);
> + if (ret)
> + goto unlock;
> +
> + drm_for_each_plane(plane, dev) {
> + struct drm_plane_state *plane_state;
> +
> + if (plane->state->fb != fb)
> + continue;
> +
> + plane_state = drm_atomic_get_plane_state(state, plane);
> + if (IS_ERR(plane_state)) {
> + ret = PTR_ERR(plane_state);
> + goto unlock;
> + }
> +
> + drm_atomic_set_fb_for_plane(plane_state, NULL);
> + ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
> + if (ret)
> + goto unlock;
> +
> + plane_mask |= BIT(drm_plane_index(plane));
> +
> + plane->old_fb = plane->fb;
> + }
> +
> + if (plane_mask)
> + ret = drm_atomic_commit(state);
> +
> +unlock:
> + if (plane_mask)
> + drm_atomic_clean_old_fb(dev, plane_mask, ret);
> +
> + if (ret == -EDEADLK) {
> + drm_modeset_backoff(&ctx);
> + goto retry;
> + }
> +
> + drm_atomic_state_put(state);
> +
> + drm_modeset_drop_locks(&ctx);
> + drm_modeset_acquire_fini(&ctx);
> +
> + return ret;
> +}
> +
> int drm_mode_atomic_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv)
> {
> diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> index cdf6860c9d22..121e250853d2 100644
> --- a/drivers/gpu/drm/drm_crtc_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_internal.h
> @@ -178,6 +178,7 @@ int drm_atomic_get_property(struct drm_mode_object *obj,
> struct drm_property *property, uint64_t *val);
> int drm_mode_atomic_ioctl(struct drm_device *dev,
> void *data, struct drm_file *file_priv);
> +int drm_atomic_remove_fb(struct drm_framebuffer *fb);
>
>
> /* drm_plane.c */
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index cbf0c893f426..c358bf8280a8 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -770,6 +770,12 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
> * in this manner.
> */
> if (drm_framebuffer_read_refcount(fb) > 1) {
> + if (dev->mode_config.funcs->atomic_commit) {
> + int ret = drm_atomic_remove_fb(fb);
> + WARN(ret, "atomic remove_fb failed with %i\n", ret);
> + goto out;
> + }
> +
> drm_modeset_lock_all(dev);
> /* remove from any CRTC */
> drm_for_each_crtc(crtc, dev) {
> @@ -787,6 +793,7 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb)
> drm_modeset_unlock_all(dev);
> }
>
> +out:
> drm_framebuffer_unreference(fb);
> }
> EXPORT_SYMBOL(drm_framebuffer_remove);
> --
> 2.7.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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