linux-kernel - [RFC 7/8] drm/fence: create per-crtc sync

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Date:	Thu, 14 Apr 2016 18:29:40 -0700
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	laurent.pinchart@...asonboard.com, seanpaul@...gle.com,
	marcheu@...gle.com, m.chehab@...sung.com,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: [RFC 7/8] drm/fence: create per-crtc sync_timeline

From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

Add one timeline per-crtc that will be use to handle fence signalling
to userspace via sync_files.

Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
---
 drivers/gpu/drm/drm_crtc.c | 9 +++++++++
 include/drm/drm_crtc.h     | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 65212ce..e1204cf 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -709,6 +709,13 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 		return -ENOMEM;
 	}
 
+	crtc->timeline = sync_timeline_create(dev->driver->name, crtc->name);
+	if (!crtc->timeline) {
+		drm_mode_object_put(dev, &crtc->base);
+		kfree(crtc->name);
+		return -ENOMEM;
+	}
+
 	crtc->base.properties = &crtc->properties;
 
 	list_add_tail(&crtc->head, &config->crtc_list);
@@ -755,6 +762,8 @@ void drm_crtc_cleanup(struct drm_crtc *crtc)
 	if (crtc->state && crtc->funcs->atomic_destroy_state)
 		crtc->funcs->atomic_destroy_state(crtc, crtc->state);
 
+	sync_timeline_destroy(crtc->timeline);
+
 	kfree(crtc->name);
 
 	memset(crtc, 0, sizeof(*crtc));
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 5ba3cda..7934178 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -32,6 +32,7 @@
 #include <linux/fb.h>
 #include <linux/hdmi.h>
 #include <linux/media-bus-format.h>
+#include <linux/sync_timeline.h>
 #include <uapi/drm/drm_mode.h>
 #include <uapi/drm/drm_fourcc.h>
 #include <drm/drm_modeset_lock.h>
@@ -715,6 +716,7 @@ struct drm_crtc_funcs {
  * @helper_private: mid-layer private data
  * @properties: property tracking for this CRTC
  * @state: current atomic state for this CRTC
+ * @timeline: sync timeline for fence sigalling
  * @acquire_ctx: per-CRTC implicit acquire context used by atomic drivers for
  * 	legacy IOCTLs
  *
@@ -771,6 +773,8 @@ struct drm_crtc {
 
 	struct drm_crtc_state *state;
 
+	struct sync_timeline *timeline;
+
 	/*
 	 * For legacy crtc IOCTLs so that atomic drivers can get at the locking
 	 * acquire context.
-- 
2.5.5