On Tue, Apr 19, 2016 at 09:52:29AM +0200, Maarten Lankhorst wrote:
> Set plane_state->base.fence to the dma_buf exclusive fence,
> and add a wait to the mmio function. This will make it easier
> to unify plane updates later on.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_atomic_plane.c | 1 +
> drivers/gpu/drm/i915/intel_display.c | 54 +++++++++++++++++++++++--------
> 2 files changed, 42 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index 7de7721f65bc..2ab45f16fa65 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -102,6 +102,7 @@ intel_plane_destroy_state(struct drm_plane *plane,
> struct drm_plane_state *state)
> {
> WARN_ON(state && to_intel_plane_state(state)->wait_req);
> + WARN_ON(state && state->fence);
> drm_atomic_helper_plane_destroy_state(plane, state);
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a2b4be06eb84..0586f1235ae3 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13411,6 +13411,15 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
> struct intel_plane_state *intel_plane_state =
> to_intel_plane_state(plane_state);
>
> + if (plane_state->fence) {
> + long lret = fence_wait(plane_state->fence, true);
> +
> + if (lret < 0) {
> + ret = lret;
> + break;
> + }
> + }
> +
> if (!intel_plane_state->wait_req)
> continue;
>
> @@ -13735,6 +13744,33 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
> .atomic_destroy_state = intel_crtc_destroy_state,
> };
>
> +static struct fence *intel_get_excl_fence(struct drm_i915_gem_object *obj)
> +{
> + struct reservation_object *resv;
> +
> +
> + if (!obj->base.dma_buf)
> + return NULL;
> +
> + resv = obj->base.dma_buf->resv;
> +
> + /* For framebuffer backed by dmabuf, wait for fence */
> + while (1) {
> + struct fence *fence_excl, *ret = NULL;
> +
> + rcu_read_lock();
> +
> + fence_excl = rcu_dereference(resv->fence_excl);
> + if (fence_excl)
> + ret = fence_get_rcu(fence_excl);
> +
> + rcu_read_unlock();
> +
> + if (ret == fence_excl)
> + return ret;
> + }
> +}
> +
> /**
> * intel_prepare_plane_fb - Prepare fb for usage on plane
> * @plane: drm plane to prepare for
> @@ -13787,19 +13823,6 @@ intel_prepare_plane_fb(struct drm_plane *plane,
> }
> }
>
> - /* For framebuffer backed by dmabuf, wait for fence */
> - if (obj && obj->base.dma_buf) {
> - long lret;
> -
> - lret = reservation_object_wait_timeout_rcu(obj->base.dma_buf->resv,
> - false, true,
> - MAX_SCHEDULE_TIMEOUT);
> - if (lret == -ERESTARTSYS)
> - return lret;
> -
> - WARN(lret < 0, "waiting returns %li\n", lret);
> - }
> -
> if (!obj) {
> ret = 0;
> } else if (plane->type == DRM_PLANE_TYPE_CURSOR &&
> @@ -13819,6 +13842,8 @@ intel_prepare_plane_fb(struct drm_plane *plane,
>
> i915_gem_request_assign(&plane_state->wait_req,
> obj->last_write_req);
> +
> + plane_state->base.fence = intel_get_excl_fence(obj);
> }
>
> i915_gem_track_fb(old_obj, obj, intel_plane->frontbuffer_bit);
> @@ -13861,6 +13886,9 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
> i915_gem_track_fb(old_obj, obj, intel_plane->frontbuffer_bit);
>
> i915_gem_request_assign(&old_intel_state->wait_req, NULL);
> +
> + fence_put(old_intel_state->base.fence);
> + old_intel_state->base.fence = NULL;
> }
>
> int
> --
> 2.1.0
>
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