From e2330f0719515e41090a4d9685b931888b7c01d6 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 29 Oct 2014 11:34:56 +0100 Subject: [PATCH] drm/atomic: Integrate fence support This patch is for enabling async commits. It replaces an earlier approach which added an async boolean paramter to the ->prepare_fb callbacks. The idea is that prepare_fb picks up the right fence to synchronize against, which is then used by the synchronous commit helper. For async commits drivers can either register a callback to the fence or simply do the synchronous wait in their async work queue. v2: Remove unused variable. v3: Only wait for fences after the point of no return in the part of the commit function which can be run asynchronously. This is after the atomic state has been swapped in, hence now check plane->state->fence. Also add a WARN_ON to make sure we don't try to wait on a fence when there's no fb, just as a sanity check. Reviewed-by: Sean Paul Signed-off-by: Daniel Vetter --- drivers/gpu/drm/drm_atomic_helper.c | 23 +++++++++++++++++++++++ include/drm/drm_crtc.h | 3 +++ 2 files changed, 26 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 077c792c46e0..4808e71dedb0 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -30,6 +30,7 @@ #include #include #include +#include static void drm_atomic_helper_plane_changed(struct drm_atomic_state *state, @@ -712,6 +713,26 @@ void drm_atomic_helper_commit_post_planes(struct drm_device *dev, } EXPORT_SYMBOL(drm_atomic_helper_commit_post_planes); +static void wait_for_fences(struct drm_device *dev, + struct drm_atomic_state *state) +{ + int nplanes = dev->mode_config.num_total_plane; + int i; + + for (i = 0; i < nplanes; i++) { + struct drm_plane *plane = state->planes[i]; + + if (!plane || !plane->state->fence) + continue; + + WARN_ON(!plane->state->fb); + + fence_wait(plane->state->fence, false); + fence_put(plane->state->fence); + plane->state->fence = NULL; + } +} + static void wait_for_vblanks(struct drm_device *dev, struct drm_atomic_state *old_state) { @@ -809,6 +830,8 @@ int drm_atomic_helper_commit(struct drm_device *dev, * current layout. */ + wait_for_fences(dev, state); + drm_atomic_helper_commit_pre_planes(dev, state); drm_atomic_helper_commit_planes(dev, state); diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index bc47d11cb126..bc1cc3ce05c4 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -42,6 +42,7 @@ struct drm_object_properties; struct drm_file; struct drm_clip_rect; struct device_node; +struct fence; #define DRM_MODE_OBJECT_CRTC 0xcccccccc #define DRM_MODE_OBJECT_CONNECTOR 0xc0c0c0c0 @@ -658,6 +659,7 @@ struct drm_connector { * struct drm_plane_state - mutable plane state * @crtc: currently bound CRTC, NULL if disabled * @fb: currently bound framebuffer + * @fence: optional fence to wait for before scanning out @fb * @crtc_x: left position of visible portion of plane on crtc * @crtc_y: upper position of visible portion of plane on crtc * @crtc_w: width of visible portion of plane on crtc @@ -673,6 +675,7 @@ struct drm_connector { struct drm_plane_state { struct drm_crtc *crtc; struct drm_framebuffer *fb; + struct fence *fence; /* Signed dest location allows it to be partially off screen */ int32_t crtc_x, crtc_y; -- 2.34.1