linux-kernel - [PATCH 5/6] reservation: add support for fences to enable cross-device synchronisation

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Message-ID: <20140217155725.20337.52848.stgit@patser>
Date:	Mon, 17 Feb 2014 16:58:26 +0100
From:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org, ccross@...gle.com,
	linaro-mm-sig@...ts.linaro.org, robdclark@...il.com,
	dri-devel@...ts.freedesktop.org, daniel@...ll.ch,
	sumit.semwal@...aro.org, linux-media@...r.kernel.org
Subject: [PATCH 5/6] reservation: add support for fences to enable
 cross-device synchronisation

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...onical.com>
---
 include/linux/reservation.h |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index 813dae960ebd..92c4851b5a39 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -6,7 +6,7 @@
  * Copyright (C) 2012 Texas Instruments
  *
  * Authors:
- * Rob Clark <rob.clark@...aro.org>
+ * Rob Clark <robdclark@...il.com>
  * Maarten Lankhorst <maarten.lankhorst@...onical.com>
  * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  *
@@ -40,22 +40,38 @@
 #define _LINUX_RESERVATION_H
 
 #include <linux/ww_mutex.h>
+#include <linux/fence.h>
 
 extern struct ww_class reservation_ww_class;
 
 struct reservation_object {
 	struct ww_mutex lock;
+
+	struct fence *fence_excl;
+	struct fence **fence_shared;
+	u32 fence_shared_count, fence_shared_max;
 };
 
 static inline void
 reservation_object_init(struct reservation_object *obj)
 {
 	ww_mutex_init(&obj->lock, &reservation_ww_class);
+
+	obj->fence_shared_count = obj->fence_shared_max = 0;
+	obj->fence_shared = NULL;
+	obj->fence_excl = NULL;
 }
 
 static inline void
 reservation_object_fini(struct reservation_object *obj)
 {
+	int i;
+
+	if (obj->fence_excl)
+		fence_put(obj->fence_excl);
+	for (i = 0; i < obj->fence_shared_count; ++i)
+		fence_put(obj->fence_shared[i]);
+
 	ww_mutex_destroy(&obj->lock);
 }
 

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